JP5690211B2 - Optical path reflection type zoom lens and imaging apparatus including the same - Google Patents

Description

  The present invention relates to a zoom lens, and more particularly to an optical path reflection type zoom lens and an image pickup apparatus including the zoom lens.

There is a zoom lens disclosed in Patent Document 1 as an optical path reflection type zoom lens. Patent Document 1 discloses two zoom lenses.
One is a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power in order from the object side to the image side. The zoom lens includes a fifth lens unit having a negative refractive power.
The other is a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a positive refractive power. The zoom lens includes a fifth lens group. The zoom lens of Patent Document 1 has an angle of view corresponding to a focal length of 35 mm at the wide-angle end in terms of 135 format, and a zoom ratio of 7.

JP 2007-304195 A

  The optical path reflection type zoom lens is suitable for reducing the thickness of the photographing apparatus. In such a zoom lens, even when in use, the entire optical system remains built in the main body of the photographing apparatus. Therefore, although the size of the optical system is likely to be limited, it is preferable to increase the degree of freedom in selecting the angle of view by increasing the zoom ratio.

  However, so far, an optical path reflection type zoom lens having a high zoom ratio has not been realized. More specifically, an optical path reflection type zoom lens having a high zoom ratio, small size, and good optical performance has not been realized. Alternatively, an optical path reflection type zoom lens having a high zoom ratio, a small size and a wide angle of view at the wide angle end has not been realized.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical path reflection type zoom lens that has a high zoom ratio, is small, and has good optical performance, and an imaging device including the zoom lens. . It is another object of the present invention to provide a small optical path reflection type zoom lens having a high zoom ratio and a wide angle of view at the wide angle end, and an image pickup apparatus including the optical path reflection type zoom lens.

The optical path reflection type zoom lens of the first invention is
From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
It consists of a rear lens group with positive refractive power as a whole,
The first lens group includes a reflecting member including a reflecting surface that reflects light rays,
The rear lens group includes, in order from the object side to the image side, three lens groups including a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power. Become
When zooming from the wide-angle end to the telephoto end, the distance between each lens group changes,
The following conditional expressions (1), (2), (3), and (4) are satisfied.
0.1 <f1G / fT <0.8 (1)
−0.5 <f2G / fT <−0.05 (2)
5.5 <β2T / β2W <20 (3)
0.5 <βRT / βRW <3 (4)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
βRT is the lateral magnification of the rear lens group when focusing on the farthest distance at the telephoto end,
βRW is the lateral magnification of the rear lens group when focusing on the farthest distance at the wide-angle end,
It is.

  In the optical path reflection type zoom lens of the first invention, each of the first lens group having a positive refractive power and the second lens group having a negative refractive power is provided with an appropriate refractive power. Thereby, it is possible to sufficiently increase the zooming effect due to the movement amount of the second lens unit having a negative refractive power. As a result, it is possible to realize a zoom lens in which the thickness direction and the total length of the optical system are short despite the large zoom ratio. The zooming action can also be expressed by an amount that represents the size of the zoom, such as a zoom ratio, a zoom ratio, and a zoom amount.

  In the optical path reflection type zoom lens according to the first aspect of the invention, the rear lens group is divided into a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power. It consists of. By doing in this way, in the lens group from the 2nd lens group to the 4th lens group, the effective diameter can be made small. Therefore, even if these lens groups are moved, the overall size including the moving mechanism can be reduced. Furthermore, it is advantageous for downsizing the imaging device in the thickness direction (direction from the subject toward the imaging device).

  Note that, when the ratio of the zooming effect borne by the rear lens group is increased in a state where the entire length of the zoom lens is suppressed, the chromatic aberration generated in the rear lens group, particularly the chromatic aberration generated at the telephoto end increases. Therefore, the zoom lens according to the first aspect of the invention is configured to satisfy the conditional expressions (1), (2), (3), and (4).

  Conditional expression (1) specifies a preferable focal length of the first lens group. By satisfying conditional expression (1), it is possible to obtain a zooming action necessary for the second lens group, and it is possible to reduce aberrations in the first lens group.

Suppressing the excess of the refractive power of the first lens unit so as not to fall below the lower limit of conditional expression (1) is advantageous in reducing aberrations in the first lens unit.
By securing the refractive power of the first lens group so as not to exceed the upper limit value of the conditional expression (1), it is possible to secure a zooming burden in the second lens group.

Conditional expression (2) specifies a preferable focal length of the second lens group.
By securing the refractive power of the second lens group so as not to fall below the lower limit value of the conditional expression (2), it is possible to secure a zooming burden in the second lens group.
Suppressing the excess of the refractive power of the second lens group so as not to exceed the upper limit value of conditional expression (2) is advantageous in reducing aberrations in the second lens group.

Conditional expression (3) specifies a preferable zooming burden of the second lens group.
By sufficiently securing the zooming load of the second lens group so as not to fall below the lower limit value of the conditional expression (3), axial chromatic aberration due to an increase of the zooming load in the rear lens group can be easily suppressed.
Astigmatism on the wide angle side can be easily suppressed by suppressing an excessive zooming load on the second lens group so as not to exceed the upper limit.

Conditional expression (4) specifies a preferable zooming burden of the rear lens group.
By making sure that the lower limit of conditional expression (4) is not exceeded, excessive reduction of the rear lens group can be suppressed, and the amount of movement of the second lens group can be reduced by reducing the variable magnification burden in the second lens group. This leads to the miniaturization of lenses. Alternatively, the refractive power of the second lens group can be easily suppressed and aberration can be easily suppressed.
By not exceeding the upper limit value of conditional expression (4), it is easy to reduce axial aberrations in the rear lens group, which is advantageous for cost reduction such as a reduction in the number of lenses in the rear lens group.

  With this configuration, it is possible to provide an optical path reflection type zoom lens that is compact and has good optical performance while ensuring a zoom ratio.

The optical path reflection type zoom lens of the second invention is
From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface that reflects light rays,
The reflecting member comprises a reflecting prism having a reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface,
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is negative refractive power,
The combined refractive power on the image side of the reflecting surface in the first lens group is a positive refractive power,
When zooming from the wide-angle end to the telephoto end, the distance between each lens group changes,
The following conditional expressions (1), (2), (3), and (16) are satisfied.
0.1 <f1G / fT <0.8 (1)
−0.5 <f2G / fT <−0.05 (2)
5.5 <β2T / β2W <20 (3)
1.0 <fW / IHmax <1.43 (16)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
IHmax is an image height in the optical path reflection type zoom lens, and the maximum value in a possible range when the image height changes,
It is.
Furthermore, the optical path reflection type zoom lens according to the second invention includes any one of the following (A) to (F). A detailed description of each conditional expression will be described later.
(A) The following conditional expression (1 ′) is satisfied instead of conditional expression (1).
0.1 <f1G / fT ≦ 0.331 (1 ′)
(B) The following conditional expression (2 ′) is satisfied instead of conditional expression (2).
−0.18 <f2G / fT <−0.05 (2 ′)
(C) The following conditional expression (9 ′) is satisfied.
2.1 <P / fW <5 (9 ′)
(D) The following conditional expressions (10 ′) and (11) are satisfied.
25 <| νd1-νd2 | <70 (10 ′)
20 <| νd1-νd3 | <70 (11)
(E) The second lens group includes, in order from the object side to the image side, a first meniscus negative lens, a second meniscus negative lens, and a positive lens. The first meniscus negative lens and the second meniscus negative lens are The following conditional expressions (12) and (13) are satisfied.
1 <SF21 (12)
SF22 <-1 (13)
(F) Of the rear lens group, the lens group having negative refractive power is composed of a cemented lens in which a positive lens and a negative lens are cemented, and satisfies the following conditional expression (14).
0.1 <| nd1-nd2 | <0.5 (14)

  By securing the refracting power of the first lens group having positive refracting power and the second lens group having negative refracting power, and securing the variable magnification load with respect to the moving amount of the second lens group having negative refracting power, An optical path reflection type zoom lens that secures a zoom ratio and is small in both the thickness direction and the total length.

The configuration of the first lens group will be described.
The combined refractive power on the object side with respect to the internal reflection surface in the first lens group is set as a negative refractive power, and the image side with respect to the internal reflection surface is set as a positive refractive power. Accordingly, the first lens group behaves like a wide conversion lens, which is advantageous for securing the angle of view at the wide angle end. Moreover, the air conversion distance of the optical path in a prism can be made small by comprising a reflecting member with a prism. This is advantageous in reducing the effective diameter on the incident side of the zoom lens and in the thickness direction of the zoom lens.
And it is set as the structure which satisfies each above-mentioned conditional expression simultaneously.

Conditional expression (1) specifies a preferable focal length of the first lens group.
Suppressing the excess of the refractive power of the first lens unit so as not to fall below the lower limit of conditional expression (1) is advantageous in reducing aberrations in the first lens unit.
By securing the refractive power of the first lens group so as not to exceed the upper limit value of the conditional expression (1), it is possible to secure a zooming burden in the second lens group.

Conditional expression (2) specifies a preferable focal length of the second lens group.
By securing the refractive power of the second lens group so as not to fall below the lower limit value of the conditional expression (2), it is possible to secure a zooming burden in the second lens group.
Suppressing the excess of the refractive power of the second lens group so as not to exceed the upper limit value of conditional expression (2) is advantageous in reducing aberrations in the second lens group.

Conditional expression (3) specifies a preferable zooming burden of the second lens group.
By sufficiently securing the zooming load of the second lens group so as not to fall below the lower limit value of the conditional expression (3), axial chromatic aberration due to an increase of the zooming load in the rear lens group can be easily suppressed.
Astigmatism on the wide angle side can be easily suppressed by suppressing an excessive zooming load on the second lens unit so as not to exceed the upper limit value of conditional expression (3).

Conditional expression (16) specifies a preferable wide-angle end focal length of the optical path reflection type zoom lens.
By making sure that the lower limit of conditional expression (16) is not exceeded, the effective diameter of the first lens unit at the wide-angle end can be reduced, the prism size can be moderately reduced, and the zoom lens can be made smaller. .
By making sure that the upper limit of conditional expression (16) is not exceeded and that the focal length at the wide angle end is not long, it is easy to ensure the brightness at the telephoto end when the zoom ratio is increased. Therefore, it becomes easy to suppress an increase in effective diameter in the first lens group, leading to miniaturization.

With such a configuration, it is possible to provide an optical path reflection type zoom lens that is small and easily secures the angle of view at the wide-angle end while securing a zoom ratio.

The optical path reflection type zoom lens of the third invention is
From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface that reflects light rays,
The reflecting member comprises a reflecting prism having a reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface,
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is negative refractive power,
The combined refractive power on the image side of the reflecting surface in the first lens group is a positive refractive power,
The rear lens group is in order from the object side to the image side.
Consists of an object-side sub-lens group and an image-side lens group in which all the intervals in the lens group are
When zooming from the wide-angle end to the telephoto end, the distance between each lens group changes,
The following conditional expressions (5), (6), (7), and (8) are satisfied.
0.1 <f1G / fT <0.38 (5)
−0.18 <f2G / fT <−0.09 (6)
7 <(β2T × βRFT) / (β2W × βRFW) <20 (7)
2.1 <P / fW <3.1 (8)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
βRFT is the lateral magnification of the object side sub-lens group when focusing on the farthest distance at the telephoto end,
βRFW is the lateral magnification of the object-side sub-lens group when focusing on the farthest distance at the wide-angle end,
P is the actual distance along the optical axis from the object side surface to the image side surface of the reflecting member in the first lens group,
It is.

  By securing the refracting power of the first lens group having positive refracting power and the second lens group having negative refracting power, and securing the variable magnification load with respect to the moving amount of the second lens group having negative refracting power, An optical path reflection type zoom lens that secures a zoom ratio and is small in both the thickness direction and the total length.

The configuration of the first lens group will be described.
The combined refractive power on the object side with respect to the internal reflection surface in the first lens group is set as a negative refractive power, and the image side with respect to the internal reflection surface is set as a positive refractive power. As a result, the first lens group behaves like a wide conversion lens, which is advantageous for securing a field angle at the wide-angle end. Further, the reflecting member is constituted by a prism. Thereby, the air conversion distance of the optical path in the prism can be reduced, which is advantageous for reducing the effective diameter of the zoom lens on the incident side and for reducing the zoom lens in the thickness direction.
And it is set as the structure which satisfies each above-mentioned conditional expression simultaneously.

Conditional expression (5) specifies a preferable focal length of the first lens group, and limits the upper limit value of conditional expression (1).
Suppressing the excess of the refractive power of the first lens unit so as not to fall below the lower limit value of conditional expression (5) is advantageous in reducing aberrations in the first lens unit.
By securing the refractive power of the first lens unit so as not to exceed the upper limit value of the conditional expression (5), it is possible to secure a zooming burden in the second lens unit.

Conditional expression (6) specifies a preferable focal length of the second lens group, and limits the lower limit value of conditional expression (2).
By securing the refractive power of the second lens group so as not to fall below the lower limit value of the conditional expression (6), it is possible to secure a zooming burden in the second lens group.
Suppressing the excess of the refractive power of the second lens group so as not to exceed the upper limit value of conditional expression (6) is advantageous in reducing aberrations in the second lens group.

Conditional expression (7) specifies a preferable zooming burden of the synthesis system of the second lens group and the object side sub lens group.
The variable power contribution of the composite system of the second lens group and the object side sub lens group is ensured so as not to fall below the lower limit value of the conditional expression (7). This can reduce the multiplication burden on the image side lens group, and can easily suppress the complexity of the mechanical structure for zooming driving.
By making sure that the upper limit of conditional expression (7) is not exceeded, it is easy to reduce the contribution of zooming in the rear lens group, and it is easy to suppress fluctuations in axial chromatic aberration.

Conditional expression (8) specifies the preferred size of the prism in the first lens group.
Ensuring the size of the prism so as not to fall below the lower limit value of conditional expression (8) is advantageous in securing the amount of peripheral light at the time of wide angle of view and high magnification.
By appropriately suppressing the size of the prism so as not to exceed the upper limit value of conditional expression (8), the zoom lens can be reduced in size.
With such a configuration, it is possible to provide an optical path reflection type zoom lens that is small and easily secures the angle of view at the wide-angle end while securing a zoom ratio.

  Further, according to a preferred aspect of the present invention, it is desirable that the object side sub lens group includes a plurality of lens groups that move upon zooming from the wide angle end to the telephoto end.

  Further, according to a preferable aspect of the present invention, it is desirable that the object side sub lens group includes a positive lens group and a negative lens group that move while changing a distance between them when zooming from the wide angle end to the telephoto end.

This is advantageous for securing a zoom ratio.
Moreover, it is more preferable that both configurations are satisfied at the same time.
It is more preferable that one or more of the following configurations are satisfied at the same time.

  According to a preferred aspect of the present invention, the first lens group is disposed on the image side of the reflecting member, the object side sub-lens group of negative refractive power disposed on the object side of the reflecting member, and the reflecting member. It is desirable that the image side sub-lens group has a positive refractive power, the object side sub lens group has one negative lens with a concave surface facing the image side, and the image side sub lens group has two positive lenses.

  The lens arrangement in the first lens group becomes an arrangement like a wide conversion lens, which is advantageous for securing the angle of view at the wide angle end. In addition, it is possible to appropriately secure a space for arranging the reflecting member while securing the positive refractive power necessary for the first lens group, which is advantageous for downsizing the first lens group. As a result, it is advantageous for downsizing the zoom lens in the thickness direction.

Moreover, according to a preferable aspect of the present invention, it is desirable that the following conditional expression (9) is satisfied.
1.2 <P / fW <5 (9)
However,
fW is the focal length of the entire zoom lens system at the wide angle end, and the focal length when focusing on the farthest distance,
P is the actual distance along the optical axis from the object side surface to the image side surface of the reflecting member,
It is.

By making sure that the lower limit of conditional expression (9) is not exceeded, it is easy to secure a space for disposing the reflecting member, which is advantageous for securing the angle of view and the amount of light in the periphery.
By making the upper limit of conditional expression (9) not exceeded, the reflecting member can be made smaller, which is advantageous for downsizing the zoom lens in the thickness direction.

Moreover, according to the preferable aspect of this invention, it is desirable to satisfy the following conditional expressions (10) and (11).
20 <| νd1-νd2 | <70 (10)
20 <| νd1-νd3 | <70 (11)
However,
νd1 is the Abbe number based on the d-line of the negative lens closest to the object side in the first lens group,
νd2 is the Abbe number based on the positive lens d-line on the object side of the image side sub lens group in the first lens group,
νd3 is the Abbe number based on the positive lens d-line on the image side of the image side sub lens group in the first lens group,
It is.

In an optical system with a high zoom ratio and a reduced optical total length, the Abbe number difference is secured so as not to fall below the lower limit values of the conditional expressions (10) and (11), so that it is located closest to the object side in the first lens group. The lateral chromatic aberration generated in the negative lens can be efficiently suppressed.
By not exceeding the upper limit values of the conditional expressions (10) and (11), it is possible to suppress a reduction in workability of the combined material and to be advantageous in terms of cost.

According to a preferred aspect of the present invention, the second lens group includes, in order from the object side to the image side, a first meniscus negative lens, a second meniscus negative lens, and a positive lens.
It is desirable that the first meniscus negative lens and the second meniscus negative lens satisfy the following conditional expressions (12) and (13).
1 <SF21 (12)
SF22 <-1 (13)
However,
SF21 is the shape factor of the first meniscus negative lens,
SF22 is the shape factor of the second meniscus negative lens,
The paraxial radius of curvature of the object side surface of the first meniscus negative lens is R21,
The paraxial radius of curvature of the image side surface of the first meniscus negative lens is R22,
The paraxial radius of curvature of the object side surface of the second meniscus negative lens is R23,
When the paraxial curvature radius of the image side surface of the second meniscus negative lens is R24,
SF21 = (R21 + R22) / (R21−R22),
SF22 = (R23 + R24) / (R23−R24),
It is.

  By making it not lower than the lower limit value of conditional expression (12) and not exceeding the upper limit value of conditional expression (13), it is advantageous for correcting coma on the wide angle side and field curvature of the entire zooming range.

According to a preferred aspect of the present invention, among the rear lens group, the lens group having negative refractive power is composed of a cemented lens in which a positive lens and a negative lens are cemented,
It is desirable to satisfy the following conditional expression (14).
0.1 <| nd1-nd2 | <0.5 (14)
However,
nd1 is the refractive index at the d-line of the positive lens of the cemented lens,
nd2 is the refractive index at the d-line of the negative lens of the cemented lens,
It is.

By using the fourth lens group as a cemented lens and taking the difference in refractive index between the two lenses as in the conditional expression (14), it is advantageous for correction of field curvature.
By not falling below the lower limit value of the conditional expression (14), it is possible to secure a difference in refractive index between the lenses, which is advantageous in correcting the field curvature.
By avoiding exceeding the upper limit value of conditional expression (14), it is possible to suppress a reduction in workability of the combined material and to be advantageous in terms of cost.

Further, according to a preferable aspect of the present invention, the rear lens group includes a positive lens group composed of one or two lens units having positive refractive power in order from the object side to the image side, and a negative lens group having negative refractive power. And a positive lens group with positive refractive power,
It is desirable that the distance between the lens groups changes during zooming from the wide-angle end to the telephoto end.

The light beam is converged on the image side by the lens unit having the positive refractive power on the image side after the whole light bundle is expanded by the lens unit having the negative refractive power on the image side than the one or two lens units having the positive refractive power. .
Accordingly, the telecentricity toward the image side is kept good, and the diameter of the entire zoom lens is reduced, which is advantageous for thinning the zoom lens.

Moreover, according to a preferable aspect of the present invention, it is desirable that the following conditional expression (15) is satisfied.
0.25 <(βRNT / βRNW) / (βRPFT / βRPFW) <7 (15)
However,
βRNT is the lateral magnification when focusing on the farthest distance at the telephoto end of the negative lens group in the rear lens group,
βRNW is the lateral magnification when focusing on the farthest distance at the wide-angle end of the negative lens group in the rear lens group,
βRPFT is the lateral magnification when focusing on the farthest distance at the telephoto end of the positive lens group in the rear lens group,
βRPFW is the lateral magnification when focusing on the farthest distance at the wide-angle end of the positive lens group in the rear lens group,
It is.

This specifies a preferable zooming ratio of each of the positive lens group and the negative lens group in the rear lens group.
Ensuring the variable magnification burden of the negative lens unit so as not to fall below the lower limit value of conditional expression (15) is advantageous in improving the variable magnification ratio.
It is advantageous for correction of axial chromatic aberration and lateral chromatic aberration by suppressing an excessive zooming burden of the negative lens unit so as not to exceed the upper limit value of conditional expression (15).

Further, according to a preferred aspect of the present invention, the lens unit having a negative refractive power in the rear lens unit group is composed of one single lens or a cemented lens, and moves for focusing,
It is desirable that the positive lens group on the image side than the negative lens in the rear lens group is fixed at the time of zooming.

Since the diameter of the focusing lens group can be made small and light, it is easy to arrange the drive mechanism, which is advantageous for thinning including the mechanical structure.
By fixing the most positive lens group on the image side where the effective diameter is likely to be large, it is advantageous for thinning the configuration including the mechanical configuration.

According to the present invention, the above-mentioned optical path reflection type zoom lens;
It is possible to provide an imaging apparatus including an imaging element that is disposed on the image side of the optical path reflection type zoom lens and converts an optical image formed by the optical path reflection type zoom lens into an electric signal.

  Thereby, it is possible to realize a thin imaging device in which various aberrations are favorably corrected while having a wide zoom ratio and a high zoom ratio.

Further, it is preferable that the above conditional expressions are further as follows. By doing in this way, the effect demonstrated by each conditional expression can be acquired more effectively.
More preferably, the lower limit value of conditional expression (1) is 0.15, more preferably 0.2, and even more preferably 0.23.
More preferably, the upper limit of conditional expression (1) is 0.7, more preferably 0.5, and even 0.32.
More preferably, the lower limit value of conditional expression (2) is −0.4, more preferably −0.3, and even more preferably −0.18.
More preferably, the upper limit value of conditional expression (2) is -0.07, more preferably -0.1, still more preferably -0.11, and even more preferably -0.12.
More preferably, the lower limit value of conditional expression (3) is 6, more preferably 6.5, further 7, and even 7.5.
More preferably, the upper limit value of conditional expression (3) is 17, more preferably 15, more preferably 13.
More preferably, the lower limit value of conditional expression (4) is 0.6, more preferably 0.7, and even more preferably 0.8.
More preferably, the upper limit of conditional expression (4) is 2.5, more preferably 2, and even more preferably 1.5.
More preferably, the lower limit value of conditional expression (5) is 0.15, more preferably 0.2, and even more preferably 0.23.
More preferably, the upper limit value of conditional expression (5) is 0.36, more preferably 0.34, and even more preferably 0.32.
More preferably, the lower limit value of conditional expression (6) should be set to -0.175, more preferably -0.17, and still more preferably -0.16.
More preferably, the upper limit value of conditional expression (6) should be set to -0.1, more preferably -0.11, more preferably -0.12, and still more preferably -0.13.
More preferably, the lower limit value of conditional expression (7) is 7.5, more preferably 8, more preferably 8.5, and even more preferably 9.
It is more preferable that the upper limit value of conditional expression (7) is 17, more preferably 14, and further 12.
It is more preferable that the lower limit value of conditional expression (8) is 2.2, more preferably 2.3.
More preferably, the upper limit value of conditional expression (8) is 3, more preferably 2.9, and even more preferably 2.8.
It is more preferable that the lower limit value of conditional expression (9) is 1.5, further 1.8, further 2.1, and further 2.3.
It is more preferable that the upper limit value of conditional expression (9) is 4, more preferably 3.5, further 3, and even 2.8.
More preferably, the lower limit value of conditional expression (10) is 25, more preferably 30, more preferably 35, and even more preferably 40.
It is more preferable that the upper limit value of conditional expression (10) is 66, further 62, and 58.
It is more preferable that the lower limit value of conditional expression (11) is 23, more preferably 26, and even 29.
More preferably, the upper limit value of conditional expression (11) is set to 65, more preferably 60, further 55, and even 50.
More preferably, the lower limit value of conditional expression (12) is 1.1, more preferably 1.15.
By setting the upper limit value 10 of the conditional expression (12) so as not to exceed this, it becomes easy to secure the negative refractive power of the first meniscus negative lens. As a result, the refractive power of the second lens group is secured.
The upper limit value of conditional expression (12) is preferably 5.0, more preferably 3.6, and further preferably 1.6.
By setting the lower limit value −10 in conditional expression (13) so as not to fall below this, it becomes easy to secure the negative refractive power of the second meniscus negative lens. As a result, the refractive power of the second lens group is secured.
It is more preferable that the lower limit value of conditional expression (13) be −5.0, more preferably −3.6.
More preferably, the upper limit value of conditional expression (13) should be set to -1.1, more preferably -1.15, and even more preferably -1.25.
More preferably, the lower limit value of conditional expression (14) is 0.15, more preferably 0.2, and even more preferably 0.25.
More preferably, the upper limit value of conditional expression (14) is 0.45, further 0.4, further 0.35, and further 0.32.
More preferably, the lower limit value of conditional expression (15) is 0.5, more preferably 1, more preferably 1.5, and even more preferably 2.
More preferably, the upper limit value of conditional expression (15) is 6, more preferably 5, further 4 and even 3.5.
More preferably, the lower limit value of conditional expression (16) is 1.05, more preferably 1.1, and still more preferably 1.2.
More preferably, the upper limit value of conditional expression (16) is 1.38, more preferably 1.34, and even more preferably 1.3.

  It is more preferable that a plurality of the above-described inventions are satisfied at the same time. For each conditional expression, only the upper limit value or lower limit value of the numerical range of the more limited conditional expression may be limited. Further, the above-described configurations may be arbitrarily combined.

  According to the present invention, it is possible to provide a zoom lens having a high zoom ratio, a small size and good optical performance, and an image pickup apparatus including the zoom lens. In addition, according to the present invention, it is possible to provide a zoom lens having a high zoom ratio, a small size and a wide angle of view at the wide-angle end, and an image pickup apparatus including the zoom lens.

FIG. 3 is a lens cross-sectional view at the wide-angle end (a), the intermediate focal length state (b), and the wide-angle end (c) when focusing on an object point at infinity according to the first embodiment of the optical path reflection type zoom lens of the present invention. FIG. 6 is a view similar to FIG. 1 of the second embodiment of the optical path reflection type zoom lens of the present invention. FIG. 6 is a view similar to FIG. 1 of the third embodiment of the optical path reflection type zoom lens of the present invention. It is a figure similar to FIG. 1 of 4th Example of the optical path reflection type zoom lens of this invention. FIG. 6 is a view similar to FIG. 1 of a fifth embodiment of the optical path reflection type zoom lens of the present invention. FIG. 6 is a view similar to FIG. 1 of the sixth embodiment of the optical path reflection type zoom lens of the present invention. FIG. 10 is a view similar to FIG. 1 of the seventh embodiment of the optical path reflection type zoom lens of the present invention. It is a figure similar to FIG. 1 of 8th Example of the optical path reflection type zoom lens of this invention. It is a figure similar to FIG. 1 of 9th Example of the optical path reflection type zoom lens of this invention. It is a figure similar to FIG. 1 of 10th Example of the optical path reflection type zoom lens of this invention. It is a figure similar to FIG. 1 of 11th Example of the optical path reflection type zoom lens of this invention. FIG. 6 is an aberration diagram for Example 1 upon focusing on an object point at infinity. FIG. 6 is an aberration diagram for Example 2 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 3 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 4 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 5 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 6 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 7 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 8 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 9 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 10 upon focusing on an object point at infinity. FIG. 10 is an aberration diagram for Example 11 upon focusing on an object point at infinity. It is a figure explaining correction | amendment of a distortion aberration. It is a front perspective view which shows the external appearance of the digital camera incorporating the optical path bending zoom lens by this invention. It is a rear view of the digital camera. It is sectional drawing of the said digital camera. It is a block diagram of the internal circuit of the main part of the digital camera.

  Embodiments of an optical path reflection type zoom lens and an imaging apparatus according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  Examples 1 to 11 of the optical path reflection type zoom lens of the present invention (hereinafter referred to as “zoom lens” where appropriate) will be described below. FIGS. 1 to 11 are sectional views of lenses at the wide-angle end (a), the intermediate focal length state (b), and the wide-angle end (c) when focusing on an object point at infinity according to Examples 1 to 11. 1 to 11, the first lens group is G1, the second lens group is G2, the third lens group is G3, the fourth lens group is G4, the fifth lens group is G5, the sixth lens group is G6, and infrared. The light cut filter is indicated by F, the cover glass is indicated by C, and the image plane is indicated by I.

  Here, the infrared light cut filter F may be a low-pass filter provided with a coat (multilayer film) for cutting infrared light. The cover glass C is a parallel plate of the electronic image sensor. In addition, you may give the coat which cuts infrared light on the surface of the cover glass C. FIG. Further, the cover glass C may have a low-pass filter action.

The numerical data is data in a state in which the object (object) at infinity is in focus. The unit of length of each numerical value is mm, and the angle is ° (degrees). Further, zoom data is values at the wide-angle end (WE), the intermediate focal length state (ST), and the telephoto end (TE).
Focusing is performed by moving the second lens unit from the image plane side.

  1 to 11, the illustration of the reflecting surface in the prism (reflecting member) is omitted, and the prism is shown in two planes as a developed view. Actually, however, as shown in FIG. Is a right angle prism.

  As shown in FIG. 1, the zoom lens of Example 1 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a biconvex positive lens, a cemented lens of a negative meniscus lens having a convex surface directed toward the object side, and a biconvex positive lens. The fourth lens group G4 is composed of a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspherical surfaces are the double-convex positive lens on the object side of the first lens group G1, the negative meniscus lens with the convex surface facing the object side of the second lens group G2, and the bi-convex positive of the third lens group G3. It is used for 9 surfaces, that is, the image side surface of the biconvex positive lens constituting the cemented lens and both surfaces of the biconvex positive lens of the fifth lens group G5.

  In FIG. 1, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 2, the zoom lens according to the second embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a positive meniscus lens having a convex surface directed toward the object side. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a biconvex positive lens, and a cemented lens of a negative meniscus lens having a convex surface directed toward the object side and a biconcave negative lens. The fourth lens group G4 includes a cemented lens of a positive meniscus lens having a convex surface directed toward the image side and a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspherical surfaces are the double-convex positive lens on the object side of the first lens group G1, the negative meniscus lens with the convex surface facing the object side of the second lens group G2, and the bi-convex positive of the third lens group G3. It is used on 8 surfaces, that is, the image side surface of the biconvex positive lens constituting the cemented lens and both sides of the lens and the object side surface of the biconvex positive lens of the fifth lens group G5.

  In FIG. 2, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 3, the zoom lens of Example 3 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a biconvex positive lens, a cemented lens of a negative meniscus lens having a convex surface directed toward the object side, and a biconvex positive lens. The fourth lens group G4 is composed of a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspherical surfaces are the double-convex positive lens on the object side of the first lens group G1, the negative meniscus lens with the convex surface facing the object side of the second lens group G2, and the bi-convex positive of the third lens group G3. It is used for 9 surfaces, that is, the image side surface of the biconvex positive lens constituting the cemented lens and both surfaces of the biconvex positive lens of the fifth lens group G5.

  In FIG. 3, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 4, the zoom lens of Example 4 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a biconvex positive lens, a cemented lens of a negative meniscus lens having a convex surface directed toward the object side, and a biconvex positive lens. The fourth lens group G4 is composed of a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspherical surfaces are the double-convex positive lens on the object side of the first lens group G1, the negative meniscus lens with the convex surface facing the object side of the second lens group G2, and the bi-convex positive of the third lens group G3. It is used for 9 surfaces, that is, the image side surface of the biconvex positive lens constituting the cemented lens and both surfaces of the biconvex positive lens of the fifth lens group G5.

  In FIG. 4, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 5, the zoom lens of Example 5 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a positive meniscus lens having a convex surface directed toward the object side. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a biconvex positive lens, a cemented lens of a negative meniscus lens having a convex surface directed toward the object side, and a biconvex positive lens. The fourth lens group G4 is composed of a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspherical surfaces are the double-convex positive lens on the object side of the first lens group G1, the negative meniscus lens with the convex surface facing the object side of the second lens group G2, and the bi-convex positive of the third lens group G3. It is used for 9 surfaces, that is, the image side surface of the biconvex positive lens constituting the cemented lens and both surfaces of the biconvex positive lens of the fifth lens group G5.

  In FIG. 5, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 6, the zoom lens of Example 6 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a biconvex positive lens, a biconvex positive lens, and a cemented lens of a biconcave negative lens and a biconvex positive lens. The fourth lens group G4 is composed of a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspherical surfaces are both surfaces of a biconvex positive lens on the object side of the first lens group G1, both surfaces of a negative meniscus lens having a convex surface facing the object side of the second lens group G2, and an object side of the third lens group G3. It is used on 9 surfaces of both surfaces of the biconvex positive lens, the image side surface of the biconvex positive lens constituting the cemented lens, and both surfaces of the biconvex positive lens of the fifth lens group G5.

  In FIG. 6, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between the two. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 7, the zoom lens of Example 7 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a positive meniscus lens having a convex surface directed toward the object side, a cemented lens having a biconvex positive lens and a biconcave negative lens, and a cemented lens having a negative meniscus lens having a convex surface directed to the object side and a biconvex positive lens. It consists of a lens. The fourth lens group G4 is composed of a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspheric surfaces are formed on both surfaces of the biconvex positive lens on the object side of the first lens group G1, on both surfaces of the negative meniscus lens with the convex surface facing the object side of the second lens group G2, and on the object side of the third lens group G3. It is used on 9 surfaces, ie, both surfaces of a positive meniscus lens having a convex surface, an image side surface of a biconvex positive lens constituting a cemented lens on the image side, and both surfaces of a biconvex positive lens of the fifth lens group G5.

  In FIG. 7, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 8, the zoom lens according to the eighth embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a positive meniscus lens having a convex surface directed toward the object side, a cemented lens having a biconvex positive lens and a biconcave negative lens, and a cemented lens having a negative meniscus lens having a convex surface directed to the object side and a biconvex positive lens. It consists of a lens. The fourth lens group G4 includes a positive meniscus lens having a convex surface directed toward the image side and a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspheric surfaces are formed on both surfaces of the biconvex positive lens on the object side of the first lens group G1, on both surfaces of the negative meniscus lens with the convex surface facing the object side of the second lens group G2, and on the object side of the third lens group G3. It is used on 9 surfaces, ie, both surfaces of a positive meniscus lens having a convex surface, an image side surface of a biconvex positive lens constituting a cemented lens on the image side, and both surfaces of a biconvex positive lens of the fifth lens group G5.

  In FIG. 8, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 9, the zoom lens of Example 9 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, The third lens group G3 has a positive refractive power, the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.

  During zooming from the wide angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4. Moves to the object side, and the fifth lens group G5 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a biconcave negative lens, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a negative meniscus lens having a convex surface directed toward the object side, a negative meniscus lens having a convex surface directed toward the image side, and a biconvex positive lens. The third lens group G3 includes a positive meniscus lens having a convex surface directed toward the object side, a cemented lens having a biconvex positive lens and a biconcave negative lens, and a cemented lens having a negative meniscus lens having a convex surface directed to the object side and a biconvex positive lens. It consists of a lens. The fourth lens group G4 includes a positive meniscus lens having a convex surface directed toward the image side and a biconcave negative lens. The fifth lens group G5 is composed of a biconvex positive lens.

  The aspheric surfaces are formed on both surfaces of the biconvex positive lens on the object side of the first lens group G1, on both surfaces of the negative meniscus lens with the convex surface facing the object side of the second lens group G2, and on the object side of the third lens group G3. It is used on 9 surfaces, ie, both surfaces of a positive meniscus lens having a convex surface, an image side surface of a biconvex positive lens constituting a cemented lens on the image side, and both surfaces of a biconvex positive lens of the fifth lens group G5.

  In FIG. 9, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, and a fifth lens group G5. The object side sub lens group is a third lens group G3 and a fourth lens group G4, and the image side lens group is a fifth lens group G5. In the object side sub lens group, the lens groups that move during zooming are the third lens group G3 and the fourth lens group G4.

  As shown in FIG. 10, the zoom lens of Example 10 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, A third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a positive refractive power. Yes.

  At the time of zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the third lens group G3 is fixed, and the fourth lens group G4 is an object. The fifth lens group G5 moves to the object side, and the sixth lens group G6 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a negative meniscus lens having a convex surface directed toward the object side, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a biconcave negative lens and a cemented lens of a biconcave negative lens and a biconvex positive lens. The third lens group G3 is composed of a positive meniscus lens having a convex surface directed toward the object side. The fourth lens group G4 includes a cemented lens of a biconvex positive lens and a biconcave negative lens, and a biconvex positive lens. The fifth lens group G5 is composed of a negative meniscus lens having a convex surface directed toward the object side. The sixth lens group G6 is composed of a biconvex positive lens.

  The aspherical surface includes an image side surface of a negative meniscus lens having a convex surface facing the object side of the first lens group G1, both surfaces of a biconvex positive lens on the object side, and a biconcave negative lens on the object side of the second lens group G2. It is used on eight surfaces, that is, the object side surface of a positive meniscus lens having a convex surface facing the object side of the third lens group G3, and both surfaces of the biconvex positive lens on the image side of the fourth lens group G4.

  In FIG. 10, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6. The object side sub lens group is the third lens group G3, the fourth lens group G4, and the fifth lens group G5, and the image side lens group is the sixth lens group G6. In the object side sub lens group, the lens groups that move during zooming are the fourth lens group G4 and the fifth lens group G5.

  As shown in FIG. 11, the zoom lens of Example 11 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, A third lens group G3 having a positive refractive power; a fourth lens group G4 having a positive refractive power; a fifth lens group G5 having a negative refractive power; and a sixth lens group G6 having a positive refractive power. Yes.

  At the time of zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the third lens group G3 is fixed, and the fourth lens group G4 is an object. The fifth lens group G5 moves to the object side, and the sixth lens group G6 is fixed. The aperture stop S is fixed, and the light amount is adjusted by changing the aperture size.

  In order from the object side, the first lens group G1 includes a negative meniscus lens having a convex surface directed toward the object side, an optical path bending prism, a biconvex positive lens, and a biconvex positive lens. The second lens group G2 includes a biconcave negative lens and a cemented lens of a biconcave negative lens and a biconvex positive lens. The third lens group G3 is composed of a positive meniscus lens having a convex surface directed toward the object side. The fourth lens group G4 includes a cemented lens of a biconvex positive lens and a biconcave negative lens, and a biconvex positive lens. The fifth lens group G5 is composed of a negative meniscus lens having a convex surface directed toward the object side. The sixth lens group G6 is composed of a biconvex positive lens.

  The aspherical surface includes an image side surface of a negative meniscus lens having a convex surface facing the object side of the first lens group G1, both surfaces of a biconvex positive lens on the object side, and a biconcave negative lens on the object side of the second lens group G2. It is used on eight surfaces, that is, the object side surface of a positive meniscus lens having a convex surface facing the object side of the third lens group G3, and both surfaces of the biconvex positive lens on the image side of the fourth lens group G4.

  In FIG. 11, the object side surface and the image side surface of the prism are both flat, and there is a reflecting surface (not shown) between them. The rear lens group is a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6. The object side sub lens group is the third lens group G3, the fourth lens group G4, and the fifth lens group G5, and the image side lens group is the sixth lens group G6. In the object side sub lens group, the lens groups that move during zooming are the fourth lens group G4 and the fifth lens group G5.

Below, the numerical data of each said Example are shown. Symbols other than the above, f is the focal length of the entire system, BF is the back focus, f1, f2... Are the focal lengths of the lens groups, IH is the image height, _FNO is the F number, ω is the half field angle, and WE is the wide angle. End, ST is an intermediate focal length state, TE is a telephoto end, r is a radius of curvature of each lens surface, d is a distance between the lens surfaces, nd is a refractive index of d-line of each lens, and νd is an Abbe number of each lens. It is. The total lens length described later is obtained by adding back focus to the distance from the lens front surface to the lens final surface. BF (back focus) represents the distance from the last lens surface to the paraxial image plane in terms of air.

  The aspherical shape is represented by the following formula, where x is an optical axis with the light traveling direction being positive, and y is a direction orthogonal to the optical axis.

x = (y ² / r) / [1+ {1− (K + 1) (y / r) ² } ^1/2 ]
+ A ₄ y ⁴ + A ₆ y ⁶ + A ₈ y ⁸ + A ₁₀ y ¹⁰ + A ₁₂ y ¹²
Here, r is a paraxial radius of curvature, K is a conic coefficient, and A ₄ , A ₆ , A ₈ , A ₁₀ , and A ₁₂ are fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order aspheric coefficients. . In the aspheric coefficient, “e−n” (n is an integer) indicates “10 ⁻ⁿ ”.

  In the following numerical examples, the image height at the wide-angle end is smaller than the intermediate focal length state and the image height at the telephoto end. This is because a barrel-type distortion is generated as described above. The value of the total angle of view (2ω) at the wide angle end in the numerical example displays the angle of view corresponding to the image height of the barrel-shaped effective imaging region.

  In the numerical examples, the numerical value indicating the reflecting surface of the reflecting member (reflecting prism) is omitted from the data, but the third surface indicates the incident surface of the reflecting member and the fourth surface indicates the exit surface of the reflecting member. Yes. Therefore, the reflecting surface exists between the third surface and the fourth surface.

Numerical example 1
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -38.646 0.60 1.91082 35.25
2 25.525 1.38
3 ∞ 12.50 1.90366 31.32
4 ∞ 0.20
5 * 30.399 2.41 1.49710 81.56
6 * -19.351 0.20
7 13.699 2.37 1.49700 81.61
8 -101.298 Variable
9 * 23.420 0.40 1.85135 40.10
10 * 3.900 2.61
11 -6.136 0.40 1.77250 49.60
12 -10.960 0.20
13 21.168 1.29 1.92286 20.88
14 -33.044 Variable
15 (Aperture) ∞ Variable
16 * 6.156 2.28 1.58313 59.38
17 * -160.000 2.20
18 26.793 0.40 1.91082 35.25
19 4.533 2.50 1.49710 81.56
20 * -14.522 variable
21 -9.613 0.40 1.88300 40.76
22 154.684 Variable
23 * 20.000 2.03 1.53071 55.69
24 * -10.075 0.60
25 ∞ 0.30 1.51633 64.14
26 ∞ 0.40
27 ∞ 0.50 1.51633 64.14
28 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -8.77447e-05, A6 = 1.19932e-07, A8 = -4.22253e-09
6th page
k = 0.000
A4 = -2.44399e-05, A6 = 1.40843e-08, A8 = -4.66640e-09
9th page
k = 0.000
A4 = -5.29160e-04, A6 = 6.90232e-06, A8 = 7.89760e-08
10th page
k = 0.000
A4 = -1.63560e-03, A6 = -8.13594e-05, A8 = 1.38576e-06, A10 = -4.45546e-07
16th page
k = 0.000
A4 = -3.32461e-04, A6 = -1.03060e-05, A8 = -1.51250e-07
17th page
k = 0.000
A4 = 5.59151e-05, A6 = -1.14432e-05, A8 = 2.35680e-07
20th page
k = 0.000
A4 = 2.86930e-04, A6 = 8.49386e-06, A8 = -1.19082e-07
23rd page
k = 0.000
A4 = -1.51026e-05, A6 = 1.42653e-05, A8 = -5.78961e-07, A10 = -1.52863e-08
24th page
k = 0.000
A4 = 1.18036e-03, A6 = -4.25065e-05, A8 = 1.45214e-06, A10 = -4.58349e-08

Zoom data
Wide angle Medium Telephoto focal length 4.94 14.32 47.75
Fno. 3.99 6.39 6.80
Angle of view 2ω 81.76 30.72 9.48
fb (in air) 1.86 1.86 1.86
Total length (in air) 67.00 67.00 67.00

d8 0.50 5.92 12.90
d14 13.17 7.75 0.78
d15 6.30 1.20 0.92
d20 9.68 12.49 5.33
d22 1.11 3.41 10.83

Group focal length
f1 = 14.71 f2 = -7.26 f3 = 12.38 f4 = -10.24 f5 = 12.93

Numerical example 2
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -38.491 0.50 1.91082 35.25
2 24.582 1.47
3 ∞ 13.00 2.00100 29.14
4 ∞ 0.20
5 * 26.807 2.62 1.49710 81.56
6 * -18.492 0.20
7 15.124 1.87 1.55332 71.68
8 202.717 Variable
9 * 22.779 0.35 1.80566 36.85
10 * 4.742 3.76
11 -7.842 0.77 1.55023 73.61
12 -70.000 0.20
13 25.371 1.04 1.92286 20.88
14 -34.812 Variable
15 (Aperture) ∞ Variable
16 * 6.630 2.20 1.58313 59.38
17 * -136.608 2.55
18 25.759 0.40 1.91082 35.25
19 4.493 3.30 1.49710 81.56
20 * -11.799 variable
21 -15.313 1.05 1.58784 39.29
22 -7.675 0.40 1.88300 40.76
23 37.579 Variable
24 * 14.191 2.00 1.52542 55.78
25 -19.310 0.70
26 ∞ 0.30 1.51633 64.14
27 ∞ 0.40
28 ∞ 0.50 1.51633 64.14
29 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -2.71360e-05, A6 = -1.35516e-06, A8 = 2.99419e-08, A10 = -1.39186e-10,
A12 = -4.46089e-12
6th page
k = 0.000
A4 = 1.89772e-05, A6 = -1.10300e-06, A8 = 1.57845e-08, A10 = 1.79050e-10,
A12 = -7.15821e-12
9th page
k = 0.000
A4 = 1.47502e-05, A6 = -8.08548e-06
10th page
k = 0.000
A4 = -4.48141e-04, A6 = -2.24110e-05, A8 = -5.55792e-07, A10 = -9.67179e-08
16th page
k = 0.000
A4 = -2.76758e-04, A6 = -2.17307e-07, A8 = -1.19918e-06, A10 = 1.15396e-07,
A12 = -5.46985e-09
17th page
k = 0.000
A4 = 1.00226e-04, A6 = -2.86487e-06, A8 = -5.67227e-07, A10 = 9.66144e-08,
A12 = -6.30352e-09
20th page
k = 0.000
A4 = -8.30132e-06, A6 = 4.62547e-06, A8 = -2.21987e-06, A10 = 1.02141e-07
24th page
k = 0.000
A4 = -4.17529e-04, A6 = 1.93617e-05, A8 = -5.57160e-07

Zoom data
Wide angle Medium Telephoto focal length 5.04 14.72 48.69
FNO. 4.00 6.49 6.99
Angle of view 2ω 80.55 29.86 9.22
fb (in air) 2.00 2.00 2.00
Total length (in air) 69.93 69.93 69.93

d8 0.30 6.33 13.97
d14 13.97 7.94 0.30
d15 6.60 1.58 0.40
d20 8.45 9.57 3.88
d23 0.73 4.62 11.49

Group focal length
f1 = 16.14 f2 = -8.41 f3 = 12.79 f4 = -9.78 f5 = 15.89

Numerical Example 3
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -36.182 0.60 1.91082 35.25
2 26.698 1.30
3 ∞ 12.50 1.90366 31.32
4 ∞ 0.20
5 * 27.415 2.51 1.49710 81.56
6 * -20.194 0.20
7 14.115 2.30 1.49700 81.61
8 -75.293 Variable
9 * 19.065 0.40 1.85135 40.10
10 * 4.007 3.03
11 -5.658 0.40 1.77250 49.60
12 -10.960 0.20
13 34.741 1.29 1.92286 20.88
14 -21.223 Variable
15 (Aperture) ∞ Variable
16 * 6.618 2.25 1.58313 59.38
17 * -400.190 2.85
18 35.885 0.40 1.91082 35.25
19 4.908 2.50 1.49710 81.56
20 * -9.691 variable
21 -10.122 0.40 1.88300 40.76
22 58.737 Variable
23 * 18.828 2.25 1.53071 55.69
24 * -10.493 0.60
25 ∞ 0.30 1.51633 64.14
26 ∞ 0.40
27 ∞ 0.50 1.51633 64.14
28 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -7.68593e-05, A6 = -2.08825e-07, A8 = -2.60631e-09
6th page
k = 0.000
A4 = -7.72156e-06, A6 = -2.45929e-07, A8 = -3.49853e-09
9th page
k = 0.000
A4 = -3.40844e-04, A6 = 8.15533e-06, A8 = 1.31968e-09
10th page
k = 0.000
A4 = -1.37937e-03, A6 = -5.08949e-05, A8 = 2.12493e-07, A10 = -2.74517e-07
16th page
k = 0.000
A4 = -2.70089e-04, A6 = -6.54167e-06, A8 = -4.34110e-08
17th page
k = 0.000
A4 = 1.45744e-04, A6 = -8.09878e-06, A8 = 1.63509e-07
20th page
k = 0.000
A4 = 1.43426e-04, A6 = 3.01580e-06, A8 = -3.98364e-07
23rd page
k = 0.000
A4 = -4.60178e-04, A6 = 2.72937e-05, A8 = -1.21822e-06, A10 = -5.38348e-10
24th page
k = 0.000
A4 = 2.73798e-04, A6 = -6.72354e-09, A8 = -5.96964e-07, A10 = -2.03935e-10

Zoom data
Wide angle Medium Telephoto focal length 5.01 14.01 48.18
Fno. 3.99 6.06 6.81
Angle of view 2ω 79.63 31.25 9.46
fb (in air) 1.90 1.90 1.90
Total length (in air) 66.97 66.97 66.97

d8 0.50 6.34 12.94
d14 13.22 7.37 0.78
d15 5.33 1.40 0.93
d20 9.29 11.20 3.66
d22 1.15 3.17 11.16

Group focal length
f1 = 14.43 f2 = -7.24 f3 = 12.39 f4 = -9.75 f5 = 13.04

Numerical Example 4
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -35.640 0.60 1.91082 35.25
2 26.599 1.30
3 ∞ 12.50 1.90366 31.32
4 ∞ 0.20
5 * 34.287 2.57 1.49710 81.56
6 * -17.495 0.20
7 13.040 2.21 1.49700 81.61
8 -358.603 Variable
9 * 23.806 0.45 1.80610 40.88
10 * 4.014 2.69
11 -7.645 0.40 1.77250 49.60
12 -21.350 0.20
13 21.001 1.29 1.92286 20.88
14 -29.482 Variable
15 (Aperture) ∞ Variable
16 * 6.450 3.02 1.58313 59.38
17 * -39.000 1.73
18 284.896 0.50 1.91082 35.25
19 5.213 2.49 1.49710 81.56
20 * -9.795 variable
21 -11.803 0.40 1.88300 40.76
22 32.483 Variable
23 * 30.000 2.33 1.53071 55.69
24 * -8.370 0.60
25 ∞ 0.30 1.51633 64.14
26 ∞ 0.40
27 ∞ 0.50 1.51633 64.14
28 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -6.73485e-05, A6 = -1.91241e-07, A8 = 6.59739e-09, A10 = -4.51795e-11
6th page
k = 0.000
A4 = -8.11814e-06, A6 = -2.33240e-07, A8 = 3.97526e-09, A10 = -1.65226e-11
9th page
k = 0.000
A4 = -3.02998e-04, A6 = -1.17258e-05, A8 = 3.33223e-07, A10 = 5.63001e-10
10th page
k = 0.000
A4 = -1.17291e-03, A6 = -6.32284e-05, A8 = -2.08134e-06, A10 = -2.77928e-07
16th page
k = 0.000
A4 = -4.54822e-04, A6 = -1.39454e-05, A8 = -9.72912e-07, A10 = -4.50729e-08
17th page
k = 0.000
A4 = -1.77671e-04, A6 = -1.78840e-05, A8 = -2.45050e-06, A10 = 5.39837e-08
20th page
k = 0.000
A4 = 5.29117e-04, A6 = 8.02554e-06, A8 = 4.10645e-06, A10 = -1.95603e-07
23rd page
k = 0.000
A4 = -6.62860e-04, A6 = 1.10689e-04, A8 = -8.48041e-06, A10 = 1.69964e-07
24th page
k = 0.000
A4 = -1.16707e-05, A6 = 1.86095e-04, A8 = -1.39048e-05, A10 = 2.82049e-07

Zoom data
Wide angle Medium telephoto focal length 4.99 14.54 48.08
Fno. 3.94 6.11 6.81
Angle of view 2ω 79.83 29.84 9.31
fb (in air) 1.90 1.90 1.90
Total length (in air) 67.00 67.00 67.00

d8 0.50 6.70 13.38
d14 13.65 7.45 0.78
d15 5.55 1.50 0.93
d20 9.12 11.03 3.86
d22 1.18 3.32 11.05

Group focal length
f1 = 14.87 f2 = -7.42 f3 = 12.14 f4 = -9.76 f5 = 12.60

Numerical Example 5
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -34.017 0.60 1.91082 35.25
2 26.036 1.30
3 ∞ 12.50 1.90366 31.32
4 ∞ 0.20
5 * 34.353 2.71 1.49710 81.56
6 * -16.380 0.20
7 13.188 2.19 1.49700 81.61
8 4859.001 Variable
9 23.759 0.45 1.88300 40.76
10 4.417 2.23
11 * -13.541 0.54 1.74320 49.29
12 * -119.194 0.31
13 15.321 1.29 1.94595 17.98
14 -2927.944 Variable
15 (Aperture) ∞ Variable
16 * 6.924 3.02 1.58313 59.38
17 * -181.891 1.68
18 57.499 0.81 1.91082 35.25
19 5.604 2.49 1.49710 81.56
20 * -8.552 variable
21 -9.659 0.40 1.88300 40.76
22 207.971 Variable
23 * 30.000 1.96 1.53071 55.69
24 * -12.866 0.60
25 ∞ 0.30 1.51633 64.14
26 ∞ 0.40
27 ∞ 0.50 1.51633 64.14
28 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -5.21636e-05, A6 = 4.12593e-07, A8 = -2.50862e-09, A10 = -1.75695e-11
6th page
k = 0.000
A4 = 4.07273e-06, A6 = 2.68010e-07, A8 = -2.66164e-10, A10 = -2.45670e-11
11th page
k = 0.000
A4 = 1.06235e-03, A6 = -1.54699e-04, A8 = 2.15426e-06
12th page
k = 0.000
A4 = 5.36376e-04, A6 = -1.51632e-04, A8 = 2.92988e-06
16th page
k = 0.000
A4 = -1.44787e-04, A6 = 1.02960e-06, A8 = -2.96739e-07, A10 = 4.74654e-09
17th page
k = 0.000
A4 = 3.97649e-04, A6 = 4.43858e-06, A8 = -3.76271e-07
20th page
k = 0.000
A4 = 4.89562e-05, A6 = -2.75931e-06, A8 = -8.79122e-08, A10 = 2.63682e-09
23rd page
k = 0.000
A4 = 2.89414e-05, A6 = 3.60745e-05, A8 = -2.55996e-06, A10 = 6.59659e-10
24th page
k = 0.000
A4 = 4.73922e-04, A6 = 1.68428e-04, A8 = -1.28948e-05, A10 = 2.17813e-07

Zoom data
Wide angle Medium Telephoto focal length 4.99 14.45 47.88
Fno. 3.91 6.09 6.90
Angle of view 2ω 79.59 30.04 9.30
fb (in air) 1.92 1.92 1.92
Total length (in air) 67.10 67.10 67.10

d8 0.50 6.93 13.61
d14 13.85 7.45 0.78
d15 5.21 1.51 0.93
d20 9.48 11.00 3.66
d22 1.26 3.44 11.35

Group focal length
f1 = 14.88 f2 = -7.49 f3 = 12.07 f4 = -10.44 f5 = 17.24

Numerical Example 6
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -35.617 0.60 1.91082 35.25
2 26.397 1.30
3 ∞ 12.50 1.90366 31.32
4 ∞ 0.20
5 * 40.941 2.54 1.49710 81.56
6 * -16.570 0.20
7 12.788 2.21 1.49700 81.61
8 -1110.979 Variable
9 * 23.733 0.45 1.80610 40.88
10 * 3.999 2.45
11 -7.884 0.40 1.77250 49.60
12 -20.492 0.20
13 18.263 1.29 1.92286 20.88
14 -39.100 variable
15 (Aperture) ∞ Variable
16 * 6.798 2.81 1.58313 59.38
17 * -8284.202 0.30
18 22.145 1.37 1.50212 53.46
19 -2002.086 0.97
20 -1699.213 0.40 1.91082 35.25
21 5.264 2.49 1.49710 81.56
22 * -9.833 variable
23 -10.248 0.40 1.88300 40.76
24 57.410 Variable
25 * 30.000 2.25 1.53071 55.69
26 * -8.954 0.60
27 ∞ 0.30 1.51633 64.14
28 ∞ 0.40
29 ∞ 0.50 1.51633 64.14
30 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -6.25108e-05, A6 = -1.72547e-08, A8 = -2.08623e-09
6th page
k = 0.000
A4 = -5.55562e-06, A6 = -8.80122e-08, A8 = -2.30137e-09
9th page
k = 0.000
A4 = -5.72637e-04, A6 = 5.54240e-06, A8 = -1.99201e-07
10th page
k = 0.000
A4 = -1.53138e-03, A6 = -6.16398e-05, A8 = -7.50957e-08, A10 = -4.57370e-07
16th page
k = 0.000
A4 = -3.90171e-04, A6 = -1.32077e-05, A8 = -7.49447e-07, A10 = -2.55835e-08
17th page
k = 0.000
A4 = -1.59970e-04, A6 = -1.50117e-05, A8 = -1.89000e-06, A10 = 3.77025e-08
22nd page
k = 0.000
A4 = 5.09649e-04, A6 = 1.71231e-06, A8 = 3.66261e-06, A10 = -1.63600e-07
25th page
k = 0.000
A4 = -5.51937e-04, A6 = 7.16367e-07, A8 = 2.56257e-06, A10 = -1.20484e-07
26th page
k = 0.000
A4 = 6.27287e-04, A6 = -5.56227e-05, A8 = 4.99951e-06, A10 = -1.54861e-07

Zoom data
Wide angle Medium telephoto focal length 4.98 14.53 48.07
Fno. 3.89 5.94 6.87
Angle of view 2ω 80.05 29.84 9.35
fb (in air) 1.89 1.89 1.89
Total length (in air) 67.26 67.26 67.26

d8 0.50 6.98 13.59
d14 13.87 7.39 0.78
d15 5.70 1.87 0.93
d22 8.80 10.57 3.67
d24 1.15 3.22 11.05

Group focal length
f1 = 15.08 f2 = -7.55 f3 = 12.11 f4 = -9.82 f5 = 13.26

Numerical Example 7
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -42.881 0.60 1.91082 35.25
2 24.081 1.37
3 ∞ 12.50 1.90366 31.32
4 ∞ 0.20
5 * 34.329 2.53 1.49710 81.56
6 * -17.897 0.20
7 13.249 2.21 1.49700 81.61
8 -286.719 Variable
9 * 57.052 0.45 1.80610 40.88
10 * 4.180 2.56
11 -8.766 0.40 1.77250 49.60
12 -21.921 0.20
13 19.245 1.29 1.92286 20.88
14 -35.971 Variable
15 (Aperture) ∞ Variable
16 * 6.830 2.05 1.58313 59.38
17 * 30.554 0.20
18 8.801 2.48 1.51633 64.14
19 -6.508 0.40 1.77250 49.60
20 41.847 0.75
21 16.971 0.40 1.91082 35.25
22 5.069 2.49 1.49710 81.56
23 * -13.422 variable
24 -11.405 0.40 1.88300 40.76
25 38.665 Variable
26 * 30.000 2.08 1.53071 55.69
27 * -10.549 0.60
28 ∞ 0.30 1.51633 64.14
29 ∞ 0.40
30 ∞ 0.50 1.51633 64.14
31 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -5.04310e-05, A6 = -2.44765e-07, A8 = 2.47491e-10
6th page
k = 0.000
A4 = 1.98396e-06, A6 = -2.57276e-07, A8 = -6.27553e-10
9th page
k = 0.000
A4 = -3.72445e-04, A6 = -9.80828e-06, A8 = 5.60749e-07
10th page
k = 0.000
A4 = -1.35287e-03, A6 = -4.86456e-05, A8 = -3.70033e-06
16th page
k = 0.000
A4 = -4.58767e-05, A6 = 1.66566e-06, A8 = -1.18212e-07
17th page
k = 0.000
A4 = -9.44377e-05, A6 = -3.59387e-06, A8 = -4.66235e-07
23rd page
k = 0.000
A4 = 8.21514e-04, A6 = 8.38794e-06, A8 = 2.19610e-06
28th page
k = 0.000
A4 = -8.94023e-04, A6 = 9.64440e-05, A8 = -3.77249e-06
27th page
k = 0.000
A4 = -1.72418e-05, A6 = 7.65004e-05, A8 = -3.48336e-06

Zoom data
Wide angle Medium Tele focal length 5.00 14.49 48.10
Fno. 3.94 5.78 6.86
Angle of view 2ω 79.86 30.05 9.35
fb (in air) 1.89 1.89 1.89
Total length (in air) 67.37 67.37 67.37

d8 0.50 7.05 13.51
d14 13.78 7.23 0.78
d15 5.94 2.21 0.93
d23 8.09 9.94 3.57
d25 1.40 3.29 10.94

Group focal length
f1 = 15.12 f2 = -7.48 f3 = 12.01 f4 = -9.94 f5 = 14.97

Numerical Example 8
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -42.747 0.60 1.91082 35.25
2 23.943 1.39
3 ∞ 12.50 1.90366 31.32
4 ∞ 0.20
5 * 33.481 2.58 1.49710 81.56
6 * -17.368 0.20
7 12.954 2.21 1.49700 81.61
8 -1392.453 Variable
9 * 53.771 0.45 1.80610 40.88
10 * 4.139 2.54
11 -8.289 0.40 1.77250 49.60
12 -21.707 0.20
13 20.111 1.29 1.92286 20.88
14 -30.027 Variable
15 (Aperture) ∞ Variable
16 * 6.788 2.05 1.58313 59.38
17 * 28.602 0.20
18 9.382 2.24 1.51633 64.14
19 -8.664 0.41 1.80400 46.57
20 53.177 0.91
21 16.166 0.40 1.91082 35.25
22 5.106 2.49 1.49710 81.56
23 * -16.079 variable
24 -18.147 1.02 1.59270 35.31
25 -7.692 0.40 1.88300 40.80
26 40.447 Variable
27 * 25.990 2.08 1.53071 55.69
28 * -14.110 0.60
29 ∞ 0.30 1.51633 64.14
30 ∞ 0.40
31 ∞ 0.50 1.51633 64.14
32 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -4.85472e-05, A6 = -2.76697e-07, A8 = 1.62474e-09
6th page
k = 0.000
A4 = 5.41766e-06, A6 = -2.92562e-07, A8 = 6.96116e-10
9th page
k = 0.000
A4 = -3.24125e-04, A6 = -1.29326e-05, A8 = 5.07407e-07
10th page
k = 0.000
A4 = -1.31262e-03, A6 = -4.50253e-05, A8 = -5.07424e-06
16th page
k = 0.000
A4 = -3.12822e-07, A6 = -1.44759e-05, A8 = 5.33715e-07
17th page
k = 0.000
A4 = 6.40750e-05, A6 = -2.36056e-05, A8 = 7.58035e-07
23rd page
k = 0.000
A4 = 7.90058e-04, A6 = 2.67963e-05, A8 = 1.04453e-06
27th page
k = 0.000
A4 = -1.15807e-03, A6 = 1.21020e-04, A8 = -4.32818e-06
28th page
k = 0.000
A4 = -7.12582e-04, A6 = 1.27701e-04, A8 = -4.79005e-06

Zoom data
Wide angle Medium Telephoto focal length 4.98 14.51 48.00
Fno. 3.94 5.78 6.72
Angle of view 2ω 80.02 30.04 9.37
fb (in air) 1.90 1.90 1.90
Total length (in air) 67.67 67.67 67.67

d8 0.50 6.96 13.36
d14 13.63 7.17 0.78
d15 5.96 2.21 0.93
d23 7.54 9.28 2.55
d26 1.40 3.40 11.42

Group focal length
f1 = 14.85 f2 = -7.38 f3 = 11.95 f4 = -10.66 f5 = 17.55

Numerical Example 9
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 -42.638 0.60 1.91082 35.25
2 23.736 1.40
3 ∞ 12.50 1.90366 31.32
4 ∞ 0.20
5 * 38.203 2.57 1.49710 81.56
6 * -16.866 0.20
7 12.908 2.21 1.49700 81.61
8 -1558.552 variable
9 * 47.442 0.45 1.80610 40.88
10 * 4.181 2.61
11 -8.399 0.40 1.77250 49.60
12 -21.851 0.20
13 20.463 1.29 1.92286 20.88
14 -30.822 Variable
15 (Aperture) ∞ Variable
16 * 6.740 2.05 1.58313 59.38
17 * 30.234 0.20
18 10.498 2.24 1.53172 48.84
19 -7.277 0.40 1.76200 40.10
20 65.229 0.91
21 19.523 0.40 1.91082 35.25
22 5.069 2.49 1.49710 81.56
23 * -12.738 variable
24 -17.039 1.01 1.59551 39.24
25 -8.122 0.40 1.88300 40.76
26 40.520 Variable
27 * 27.007 2.08 1.53071 55.69
28 * -14.348 0.60
29 ∞ 0.30 1.51633 64.14
30 ∞ 0.40
31 ∞ 0.50 1.51633 64.14
32 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 5th surface
k = 0.000
A4 = -5.10488e-05, A6 = -2.00093e-07, A8 = 1.93559e-09
6th page
k = 0.000
A4 = 1.13214e-06, A6 = -2.28173e-07, A8 = 1.02834e-09
9th page
k = 0.000
A4 = -4.28804e-04, A6 = -9.29076e-06, A8 = 5.13867e-07
10th page
k = 0.000
A4 = -1.38831e-03, A6 = -4.73200e-05, A8 = -4.07096e-06
16th page
k = 0.000
A4 = -5.66901e-05, A6 = -4.99021e-06, A8 = 2.53365e-07
17th page
k = 0.000
A4 = 9.78066e-07, A6 = -9.59051e-06, A8 = 2.30600e-07
23rd page
k = 0.000
A4 = 6.33623e-04, A6 = 1.47846e-05, A8 = 1.10880e-06
27th page
k = 0.000
A4 = -9.17880e-04, A6 = 9.84765e-05, A8 = -3.80817e-06
28th page
k = 0.000
A4 = -3.73708e-04, A6 = 9.66563e-05, A8 = -4.09629e-06

Zoom data
Wide angle Medium Telephoto focal length 5.00 14.53 48.02
Fno. 3.98 5.82 6.81
Angle of view 2ω 79.84 29.99 9.37
fb (in air) 1.90 1.90 1.90
Total length (in air) 68.28 68.28 68.28

d8 0.50 7.11 13.62
d14 13.89 7.28 0.78
d15 5.98 2.21 0.93
d23 7.79 9.48 2.94
d26 1.41 3.48 11.31

Group focal length
f1 = 15.07 f2 = -7.52 f3 = 12.11 f4 = -10.67 f5 = 17.97

Numerical Example 10
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 78.570 0.62 1.90200 25.10
2 * 12.038 2.73
3 ∞ 11.97 2.00069 25.46
4 ∞ 0.20
5 * 21.938 3.25 1.49700 81.54
6 * -13.773 0.20
7 29.700 2.07 1.69575 56.39
8 -49.852 Variable
9 * -17.356 0.40 1.76802 49.24
10 * 6.262 1.30
11 -16.296 0.50 1.88300 40.76
12 14.721 1.72 1.94595 17.98
13 -30.504 Variable
14 (Aperture) ∞ 0.60
15 * 7.086 1.45 1.58313 59.38
16 12.916 Variable
17 7.273 2.92 1.49700 81.54
18 -34.798 0.50 1.90366 31.32
19 11.203 0.20
20 * 10.919 2.18 1.52500 55.80
21 * -9.055 variable
22 14.809 1.10 1.89991 30.66
23 5.293 Variable
24 29.036 2.60 1.52542 55.78
25 -10.758 0.15
26 ∞ 0.42 1.51633 64.14
27 ∞ 0.50
28 ∞ 0.50 1.51633 64.14
29 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 2nd surface
k = -4.467
A4 = 3.91245e-04, A6 = -2.16192e-06, A8 = 3.03393e-08
5th page
k = -3.000
A4 = -1.84363e-05, A6 = -5.92060e-07, A8 = 4.11059e-09
6th page
k = -0.046
A4 = 3.03309e-05, A6 = -5.52836e-07, A8 = 1.91955e-09
9th page
k = 0.000
A4 = 1.42686e-04
10th page
k = 0.000
A4 = -6.35859e-04, A6 = -6.24495e-06
15th page
k = 0.000
A4 = -3.09946e-04, A6 = -5.03020e-06
20th page
k = 0.000
A4 = -7.60026e-04
21st page
k = 0.000
A4 = 2.41202e-04

Zoom data
Wide angle Medium telephoto focal length 4.61 18.32 44.25
Fno. 3.97 5.64 7.00
Angle of view 2ω 81.32 23.56 10.34
fb (in air) 1.64 1.64 1.64
Total length (in air) 67.60 67.60 67.60

d8 0.50 7.00 10.12
d13 10.62 4.12 1.00
d16 9.01 4.24 1.40
d21 7.10 6.80 1.90
d23 2.22 7.30 15.03

Group focal length
f1 = 11.14 f2 = -5.47 f3 = 24.66 f4 = 12.90 f5 = -9.68 f6 = 15.28

Numerical Example 11
Unit mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 71.194 0.62 1.90200 25.10
2 * 11.844 2.73
3 ∞ 11.97 2.00069 25.46
4 ∞ 0.20
5 * 21.524 3.25 1.49700 81.54
6 * -13.870 0.20
7 35.864 2.07 1.69680 55.53
8 -39.094 Variable
9 * -19.044 0.40 1.76802 49.24
10 * 6.099 1.30
11 -17.782 0.50 1.88300 40.76
12 14.050 1.72 1.94595 17.98
13 -35.404 Variable
14 (Aperture) ∞ 0.60
15 * 6.857 1.45 1.58313 59.38
16 12.449 Variable
17 7.601 2.92 1.49700 81.54
18 -28.563 0.50 1.90366 31.32
19 12.457 0.20
20 * 10.745 2.10 1.52542 55.78
21 * -9.320 variable
22 15.297 1.10 1.90366 31.32
23 5.292 Variable
24 32.730 2.83 1.52542 55.78
25 -10.510 0.15
26 ∞ 0.42 1.51633 64.14
27 ∞ 0.50
28 ∞ 0.50 1.51633 64.14
29 ∞ 0.37
Image plane (imaging plane) ∞

Aspheric data 2nd surface
k = -4.467
A4 = 4.19128e-04, A6 = -2.47164e-06, A8 = 3.81504e-08
5th page
k = -3.000
A4 = -1.91140e-05, A6 = -7.15817e-07, A8 = 5.76963e-09
6th page
k = -0.080
A4 = 3.31594e-05, A6 = -6.59299e-07, A8 = 2.84116e-09
9th page
k = 0.000
A4 = 1.45475e-04
10th page
k = 0.000
A4 = -6.03068e-04, A6 = -8.00932e-06
15th page
k = 0.000
A4 = -3.28572e-04, A6 = -5.03020e-06
20th page
k = 0.000
A4 = -6.90145e-04
21st page
k = 0.000
A4 = 2.97105e-04

Zoom data
Wide angle Medium telephoto focal length 4.63 19.32 44.24
Fno. 3.97 5.55 7.00
Angle of view 2ω 81.51 22.46 10.40
fb (in air) 1.65 1.65 1.65
Total length (in air) 67.60 67.60 67.60

d8 0.50 7.36 10.15
d13 10.65 3.80 1.00
d16 9.16 4.51 1.23
d21 6.76 6.43 1.92
d23 2.23 7.20 15.00

Group focal length
f1 = 11.17 f2 = -5.47 f3 = 23.90 f4 = 12.70 f5 = -9.45 f6 = 15.49

Aberration diagrams at the time of focusing on an object point at infinity in Examples 1 to 11 are shown in FIGS. In these aberration diagrams, (a) is the wide-angle end, (b) is the intermediate focal length state, (c) is the spherical aberration (SA), astigmatism (AS), distortion (DT), and lateral chromatic aberration at the telephoto end. (CC) is shown. In each figure, “FIY” indicates the maximum image height.

The values corresponding to the conditional expressions of each example are listed below.

Example 1 Example 2 Example 3 Example 4
(1) (5) 0.308 0.331 0.300 0.309
(2) (6) -0.152 -0.173 -0.150 -0.154
(3) 7.888 8.148 11.092 10.502
(4) 1.224 1.187 0.867 0.917
(7) 9.667 9.697 9.624 9.605
(8) (9) 2.528 2.582 2.495 2.503
(10) 46.31 46.31 46.31 46.31
(11) 46.36 36.43 46.36 46.36
(12) 1.400 1.526 1.532 1.406
(13) -3.544 -1.252 -3.134 -2.116
(14)-0.295--
(15) 2.189 2.515 3.200 2.989
(16) 1.281 1.305 1.298 1.294

Example 5 Example 6 Example 7 Example 8
(1) (5) 0.311 0.314 0.314 0.309
(2) (6) -0.156 -0.157 -0.156 -0.154
(3) 11.799 10.085 8.896 9.562
(4) 0.814 0.957 1.082 1.007
(7) 9.553 9.666 9.634 9.662
(8) (9) 2.507 2.509 2.501 2.508
(10) 46.31 46.31 46.31 46.31
(11) 46.36 46.36 46.36 46.36
(12) 1.457 1.405 1.158 1.167
(13) -1.256 -2.251 -2.333 -2.236
(14)---0.290
(15) 3.339 2.885 2.453 2.620
(16) 1.291 1.291 1.295 1.291

Example 9 Example 10 Example 11
(1) (5) 0.314 0.252 0.253
(2) (6) -0.157 -0.124 -0.124
(3) 9.323 8.060 7.794
(4) 1.031 1.190 1.226
(7) 9.616 9.611 9.568
(8) (9) 2.502 2.595 2.586
(10) 46.31 56.44 56.44
(11) 46.36 31.2865 30.43
(12) 1.193 0.470 0.515
(13) -2.249 0.051 0.117
(14) 0.287--
(15) 2.527 2.848 2.761
(16) 1.294 1.201 1.206

(Correction of distortion)
By the way, when the zoom lens of the present invention is used, image distortion is digitally corrected electrically. For this reason, the image height IH near the wide-angle end is reduced, and the effective image pickup area near the wide-angle end is shaped like a barrel.
The basic concept for digitally correcting image distortion will be described below.

  For example, as shown in FIG. 23, the magnification on the circumference (image height) of the radius R inscribed in the long side of the effective imaging surface around the intersection of the optical axis and the imaging surface is fixed. The standard for correction. Then, correction is performed by moving each point on the circumference (image height) of any other radius r (ω) in a substantially radial direction and concentrically so as to have the radius r ′ (ω). To do.

For example, in FIG. 23, a point P ₁ on the circumference of an arbitrary radius r ₁ (ω) located inside the circle of radius R is a radius r ₁ ′ (ω) circle to be corrected toward the center of the circle. Move to point P ₂ on the circumference. A point Q ₁ on the circumference of an arbitrary radius r ₂ (ω) located outside the circle of radius R is a radius r ₂ ′ (ω) circumference to be corrected in a direction away from the center of the circle. It is moved to the point Q ₂ of the above.

Here, r ′ (ω) can be expressed as follows.
r ′ (ω) = α · f · tan ω (0 ≦ α ≦ 1)
However,
ω is the half field angle of the subject, f is the focal length of the imaging optical system (in the present invention, the zoom lens),
α is 0 or more and 1 or less.

Here, if the ideal image height corresponding to the circle (image height) of radius R is Y,
α = R / Y = R / (f · tan ω)
It becomes.

  The optical system is ideally rotationally symmetric with respect to the optical axis, that is, distortion is also generated rotationally symmetric with respect to the optical axis. Therefore, as described above, when the optically generated distortion aberration is electrically corrected, the radius inscribed in the long side of the effective imaging surface around the intersection of the optical axis and the imaging surface on the reproduced image. The magnification on the circumference of the circle of R (image height) is fixed, and the other points on the circumference of the circle (image height) of radius r (ω) are moved in a substantially radial direction to obtain a radius r ′ ( If correction can be performed by moving the concentric circles so that ω), it is considered advantageous in terms of data amount and calculation amount.

  However, the optical image is no longer a continuous amount (due to sampling) when captured by the electronic image sensor. Therefore, strictly speaking, the circle with the radius R drawn on the optical image is not an accurate circle unless the pixels on the electronic image sensor are arranged radially.

  That is, in the shape correction of the image data represented for each discrete coordinate point, there is no circle that can fix the magnification. Therefore, it is preferable to use a method of determining the coordinates (Xi ′, Yj ′) of the movement destination for each pixel (Xi, Yj). When two or more points (Xi, Yj) have moved to the coordinates (Xi ′, Yj ′), the average value of the values possessed by each pixel is taken. If there is no moving point, interpolation may be performed using the values of the coordinates (Xi ′, Yj ′) of some surrounding pixels.

  Such a method is particularly distorted with respect to the optical axis due to manufacturing errors of an optical system or an electronic image pickup device in an electronic image pickup apparatus having a zoom lens, and the circle of the radius R drawn on the optical image is asymmetric. It is effective for correction when Further, it is effective for correction when a geometric distortion or the like occurs when a signal is reproduced as an image in an image sensor or various output devices.

  In the electronic imaging apparatus of the present invention, in order to calculate the correction amount r ′ (ω) −r (ω), r (ω), that is, the relationship between the half field angle and the image height, or the real image height r and the ideal image height. The relationship between r ′ / α may be recorded on a recording medium built in the electronic imaging apparatus.

  Note that the radius R should satisfy the following conditional expression in order to prevent the image after distortion correction from having an extremely short amount of light at both ends in the short side direction.

0 ≦ R ≦ 0.6Ls
However, Ls is the length of the short side of the effective imaging surface.

The radius R preferably satisfies the following conditional expression.
0.3Ls≤R≤0.6Ls
Furthermore, it is most advantageous to make the radius R coincide with the radius of the inscribed circle in the short side direction of the substantially effective imaging surface. In the case of correction in which the magnification is fixed in the vicinity of the radius R = 0, that is, in the vicinity of the axis, there is a slight disadvantage in terms of image quality, but the effect of reducing the size is secured even if the angle of view is widened. it can.

The focal length section that needs to be corrected is divided into several focal zones. And approximately near the telephoto end in the divided focal zone,
r ′ (ω) = α · f · tan ω
You may correct | amend with the same correction amount as the case where the correction result which satisfies is obtained.

  However, in that case, some barrel distortion remains at the wide-angle end in the divided focal zone. Further, if the number of divided zones is increased, it becomes unnecessary to store extraneous data necessary for correction on the recording medium, which is not preferable. Therefore, one or several coefficients related to each focal length in the divided focal zone are calculated in advance. This coefficient may be determined on the basis of simulation or actual measurement.

And near the telephoto end in the divided zone,
r ′ (ω) = α · f · tan ω
A correction amount when a correction result satisfying the above is obtained may be calculated, and the final correction amount may be obtained by uniformly multiplying the correction amount by a coefficient for each focal length.

By the way, if there is no distortion in the image obtained by imaging an object at infinity,
f = y / tan ω
Is established.
Where y is the height of the image point from the optical axis (image height), f is the focal length of the imaging system (in the present invention, the zoom lens), and ω is the image point connected from the center on the imaging surface to the y position. It is an angle (subject half field angle) with respect to the optical axis in the corresponding object direction.

If the imaging system has barrel distortion,
f> y / tan ω
It becomes. That is, if the focal length f of the imaging system and the image height y are constant, the value of ω increases.

(Optical path folding digital camera)
The zoom lens of the present invention as described above forms an object image, and the image can be received by an electronic image sensor such as a CCD. The embodiment is illustrated below.

  24 to 26 are conceptual diagrams of a configuration in which the zoom lens according to the present invention is incorporated in a photographing optical system 141 of a digital camera. 24 is a front perspective view showing the appearance of the digital camera 140, FIG. 25 is a rear perspective view thereof, and FIG. 26 is a cross-sectional view showing the configuration of the digital camera 140. In this example, the digital camera 140 includes a photographing optical system 141 having a photographing optical path 142, a finder optical system 143 having a finder optical path 144, a shutter 145, a flash 146, a liquid crystal display monitor 147, and the like. When the shutter 145 disposed in the position is pressed, photographing is performed through the photographing optical system 141, for example, the optical path bending zoom lens according to the first embodiment in conjunction therewith. An object image formed by the photographing optical system 141 is formed on the imaging surface of the CCD 149 through a near-infrared cut filter and an optical low-pass filter F. The object image received by the CCD 149 is displayed as an electronic image on a liquid crystal display monitor 147 provided on the back of the camera via the processing means 151. Further, the processing means 151 is connected to a recording means 152 so that a photographed electronic image can be recorded. The recording unit 152 may be provided separately from the processing unit 151, or may be configured to perform recording / writing electronically using a flexible disk, a memory card, an MO, or the like. Further, instead of the CCD 149, a silver salt camera in which a silver salt film is arranged may be configured.

  Further, a finder objective optical system 153 is disposed on the finder optical path 144. The object image formed by the finder objective optical system 153 is formed on the field frame 157 of the Porro prism 155 that is an image erecting member. Behind this polyprism 155, an eyepiece optical system 159 for guiding an erect image to the observer eyeball E is disposed. Cover members 150 are disposed on the incident side of the photographing optical system 141 and the finder objective optical system 153 and on the exit side of the eyepiece optical system 159, respectively.

  The digital camera 140 configured in this manner is a zoom lens having a high zoom ratio and a high optical performance of the photographing optical system 141 of about 10 times. Therefore, the digital camera 140 is a low-cost digital camera with high performance and extremely thin depth direction. Can be realized.

In addition, in the example of FIG. 26, although a parallel plane board is arrange | positioned as the cover member 150, you may omit.
Distortion correction circuit

(Internal circuit configuration)
FIG. 27 is a block diagram showing the internal circuitry of the main part of the digital camera 140. In the following description, the processing means includes, for example, the CDS / ADC unit 124, the temporary storage memory 117, the image processing unit 118, and the like, and the storage means includes, for example, the storage medium unit 119.

  As shown in FIG. 27, the digital camera 140 is connected to the operation unit 112, the control unit 113 connected to the operation unit 112, and the control signal output port of the control unit 113 via buses 114 and 115. An imaging drive circuit 116, a temporary storage memory 117, an image processing unit 118, a storage medium unit 119, a display unit 120, and a setting information storage memory unit 121 are provided.

  The temporary storage memory 117, the image processing unit 118, the storage medium unit 119, the display unit 120, and the setting information storage memory unit 121 are configured so that data can be input or output with each other via the bus 122. In addition, a CCD 149 and a CDS / ADC unit 124 are connected to the imaging drive circuit 116.

  The operation unit 112 includes various input buttons and switches, and is a circuit that notifies the control unit of event information input from the outside (camera user) via these input buttons and switches.

  The control unit 113 is a central processing unit composed of, for example, a CPU and the like. The control unit 113 includes a program memory (not shown) and is input from the camera user via the operation unit 112 according to a program stored in the program memory. This is a circuit that controls the entire digital camera 140 in response to an instruction command.

  The CCD 149 receives an object image formed through the photographing optical system 141 according to the present invention. The CCD 149 is an image pickup element that is driven and controlled by the image pickup drive circuit 116, converts the light amount of each pixel of the object image into an electrical signal, and outputs the electric signal to the CDS / ADC unit 124.

  The CDS / ADC unit 124 amplifies the electric signal input from the CCD 149 and performs analog / digital conversion, and temporarily stores the raw video data (Bayer data, hereinafter referred to as RAW data) that has just been subjected to the amplification and digital conversion. This is a circuit for outputting to the storage memory 117.

  The temporary storage memory 117 is a buffer made of, for example, SDRAM or the like, and is a memory device that temporarily stores the RAW data output from the CDS / ADC unit 124. The image processing unit 118 reads out the RAW data stored in the temporary storage memory 117 or the RAW data stored in the storage medium unit 119, and performs various corrections including distortion correction based on the image quality parameter designated from the control unit 113. It is a circuit that performs image processing electrically.

  The recording medium unit 119 detachably mounts a card-type or stick-type recording medium made of, for example, a flash memory, and RAW data transferred from the temporary storage memory 117 to the card-type or stick-type flash memory. This is a control circuit of an apparatus for recording and holding image data processed by the image processing unit 118.

  The display unit 120 includes a liquid crystal display monitor, and is a circuit that displays an image, an operation menu, and the like on the liquid crystal display monitor. The setting information storage memory unit 121 stores a ROM unit in which various image quality parameters are stored in advance, and an image quality parameter selected by an input operation of the operation unit 112 among the image quality parameters read from the ROM unit. RAM section is provided. The setting information storage memory unit 121 is a circuit that controls input and output to these memories.

  In the digital camera 140 configured in this way, the imaging optical system 141 has a sufficiently wide angle range and a compact configuration according to the present invention, and the imaging performance is extremely stable at a high zoom ratio and in a full zoom ratio range. Therefore, high performance, downsizing, and wide angle of view can be realized. In addition, fast focusing operation on the wide-angle side and the telephoto side is possible.

  As described above, the zoom lens according to the present invention is useful for maintaining high optical performance and reducing costs, and is particularly suitable for an optical system of an image pickup apparatus including an electronic image pickup element such as a CCD or a CMOS.

G1 ... 1st lens group G2 ... 2nd lens group G3 ... 3rd lens group G4 ... 4th lens group G5 ... 5th lens group G6 ... 6th lens group S ... Aperture stop F ... Low pass filter C ... Cover glass P ... Prism I ... Image plane 112 ... Operation unit 113 ... Control unit 114 ... Bus 115 ... Bus 116 ... Imaging drive circuit 117 ... Temporary storage memory 118 ... Image processing unit 119 ... Storage medium unit 120 ... Display unit 121 ... Setting information storage memory unit 122 ... Bus 124 ... CDS / ADC section 140 ... Digital camera 141 ... Shooting optical system 142 ... Shooting optical path 143 ... Viewfinder optical system 144 ... Viewfinder optical path 145 ... Shutter button 146 ... Flash 147 ... Liquid crystal display monitor 149 ... CCD
150: cover member 151 ... processing means 152 ... recording means 153 ... finder objective optical system 155 ... erecting prism 157 ... field frame 159 ... eyepiece optical system

Claims (19)

From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
It consists of a rear lens group with positive refractive power as a whole,
The first lens group includes a reflecting member including a reflecting surface for reflecting light rays,
The rear lens group includes three lens groups of a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power in order from the object side to the image side. Consists of
When zooming from the wide-angle end to the telephoto end, the distance between the lens groups changes,
An optical path reflection type zoom lens satisfying the following conditional expressions (1), (2), (3), and (4).
0.1 <f1G / fT <0.8 (1)
−0.5 <f2G / fT <−0.05 (2)
5.5 <β2T / β2W <20 (3)
0.5 <βRT / βRW <3 (4)
However,
f1G is the focal length of the first lens group,
f2G is a focal length of the second lens group,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
βRT is the lateral magnification of the rear lens group when focusing on the longest distance at the telephoto end,
βRW is the lateral magnification of the rear lens group when focusing on the farthest distance at the wide-angle end,
It is. From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface for reflecting light rays,
The reflecting member includes a reflecting prism having the reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface;
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is a negative refractive power,
The combined refractive power on the image side with respect to the reflecting surface in the first lens group is a positive refractive power,
When zooming from the wide-angle end to the telephoto end, the distance between the lens groups changes,
An optical path reflection type zoom lens satisfying the following conditional expressions ( 1 ′ ), (2), (3), and (16).
0.1 <f1G / fT ≦ 0.331 (1 ′)
−0.5 <f2G / fT <−0.05 (2)
5.5 <β2T / β2W <20 (3)
1.0 <fW / IHmax <1.43 (16)
However,
f1G is the focal length of the first lens group,
f2G is a focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
IHmax is an image height in the optical path reflection type zoom lens, and the maximum value in a possible range when the image height changes,
It is. From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface for reflecting light rays,
The reflecting member includes a reflecting prism having the reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface;
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is a negative refractive power,
The combined refractive power on the image side with respect to the reflecting surface in the first lens group is a positive refractive power,
When zooming from the wide-angle end to the telephoto end, the distance between the lens groups changes,
An optical path reflection type zoom lens satisfying the following conditional expressions (1), (2 '), (3), and (16).
0.1 <f1G / fT <0.8 (1)
−0.18 <f2G / fT <−0.05 (2 ′)
5.5 <β2T / β2W <20 (3)
1.0 <fW / IHmax <1.43 (16)
However,
f1G is the focal length of the first lens group,
f2G is a focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
IHmax is an image height in the optical path reflection type zoom lens, and the maximum value in a possible range when the image height changes,
It is. From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface for reflecting light rays,
The reflecting member includes a reflecting prism having the reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface;
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is a negative refractive power,
The combined refractive power on the image side with respect to the reflecting surface in the first lens group is a positive refractive power,
When zooming from the wide-angle end to the telephoto end, the distance between the lens groups changes,
An optical path reflection type zoom lens satisfying the following conditional expressions (1), (2), (3), (9 '), and (16).
0.1 <f1G / fT <0.8 (1)
−0.5 <f2G / fT <−0.05 (2)
5.5 <β2T / β2W <20 (3)
2.1 <P / fW <5 (9 ')
1.0 <fW / IHmax <1.43 (16)
However,
f1G is the focal length of the first lens group,
f2G is a focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
IHmax is an image height in the optical path reflection type zoom lens, and the maximum value in a possible range when the image height changes,
P is the actual distance along the optical axis from the object side surface to the image side surface of the reflecting member,
It is. From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface for reflecting light rays,
The reflecting member includes a reflecting prism having the reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface;
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is a negative refractive power,
The combined refractive power on the image side with respect to the reflecting surface in the first lens group is a positive refractive power,
When zooming from the wide-angle end to the telephoto end, the distance between the lens groups changes,
The lens group closer to the image side than the reflecting surface in the first lens group is an image side sub-lens group,
An optical path reflection type zoom lens satisfying the following conditional expressions (1), (2), (3), (10 '), (11), and (16).
0.1 <f1G / fT <0.8 (1)
−0.5 <f2G / fT <−0.05 (2)
5.5 <β2T / β2W <20 (3)
25 <| νd1−νd2 | <70 (10 ′)
20 <| νd1-νd3 | <70 (11)
1.0 <fW / IHmax <1.43 (16)
However,
f1G is the focal length of the first lens group,
f2G is a focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
IHmax is an image height in the optical path reflection type zoom lens, and the maximum value in a possible range when the image height changes,
νd1 is the Abbe number based on the d-line of the negative lens closest to the object side in the first lens group,
νd2 is the Abbe number based on the positive lens d-line on the object side of the image side sub lens group in the first lens group,
νd3 is the Abbe number based on the positive lens d-line on the image side of the image side sub lens group in the first lens group,
It is. From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface for reflecting light rays,
The reflecting member includes a reflecting prism having the reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface;
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is a negative refractive power,
The combined refractive power on the image side with respect to the reflecting surface in the first lens group is a positive refractive power,
When zooming from the wide-angle end to the telephoto end, the distance between the lens groups changes,
The second lens group includes, in order from the object side to the image side, a first meniscus negative lens, a second meniscus negative lens, and a positive lens.
The first meniscus negative lens and the second meniscus negative lens satisfy the following conditional expressions (12) and (13):
An optical path reflection type zoom lens satisfying the following conditional expressions (1), (2), (3), and (16).
0.1 <f1G / fT <0.8 (1)
−0.5 <f2G / fT <−0.05 (2)
5.5 <β2T / β2W <20 (3)
1 <SF21 (12)
SF22 <-1 (13)
1.0 <fW / IHmax <1.43 (16)
However,
f1G is the focal length of the first lens group,
f2G is a focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
IHmax is an image height in the optical path reflection type zoom lens, and the maximum value in a possible range when the image height changes,
SF21 is a shape factor of the first meniscus negative lens,
SF22 is a shape factor of the second meniscus negative lens,
The paraxial radius of curvature of the object side surface of the first meniscus negative lens is R21,
The paraxial radius of curvature of the image side surface of the first meniscus negative lens is R22,
The paraxial radius of curvature of the object side surface of the second meniscus negative lens is R23,
When the paraxial curvature radius of the image side surface of the second meniscus negative lens is R24,
SF21 = (R21 + R22) / (R21−R22),
SF22 = (R23 + R24) / (R23−R24),
It is. From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface for reflecting light rays,
The reflecting member includes a reflecting prism having the reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface;
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is a negative refractive power,
The combined refractive power on the image side with respect to the reflecting surface in the first lens group is a positive refractive power,
When zooming from the wide-angle end to the telephoto end, the distance between the lens groups changes,
Among the rear lens group, the lens group having negative refractive power is composed of a cemented lens in which a positive lens and a negative lens are cemented,
An optical path reflection type zoom lens satisfying the following conditional expressions (1), (2), (3), (14), and (16).
0.1 <f1G / fT <0.8 (1)
−0.5 <f2G / fT <−0.05 (2)
5.5 <β2T / β2W <20 (3)
0.1 <| nd1-nd2 | <0.5 (14)
1.0 <fW / IHmax <1.43 (16)
However,
f1G is the focal length of the first lens group,
f2G is a focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
IHmax is an image height in the optical path reflection type zoom lens, and the maximum value in a possible range when the image height changes,
nd1 is the refractive index at the d-line of the positive lens of the cemented lens,
nd2 is the refractive index at the d-line of the negative lens of the cemented lens,
It is. From the object side to the image side,
A first lens unit having a positive refractive power;
A second lens unit having negative refractive power;
Consists of a rear lens group having a positive refractive power as a whole including a plurality of lens groups,
The first lens group includes a reflecting member including a reflecting surface for reflecting light rays,
The reflecting member includes a reflecting prism having the reflecting surface as an inner reflecting surface and having an object side surface that is an object side refractive surface and an image side surface that is an image side refractive surface;
The combined refractive power on the object side with respect to the reflecting surface in the first lens group is a negative refractive power,
The combined refractive power on the image side with respect to the reflecting surface in the first lens group is a positive refractive power,
The rear lens group is in order from the object side to the image side.
Consists of an object-side sub-lens group and an image-side lens group in which all the intervals are constant in the lens group,
When zooming from the wide-angle end to the telephoto end, the distance between the lens groups changes,
An optical path reflection type zoom lens satisfying the following conditional expressions (5), (6), (7), and (8).
0.1 <f1G / fT <0.38 (5)
−0.18 <f2G / fT <−0.09 (6)
7 <(β2T × βRFT) / (β2W × βRFW) <20 (7)
2.1 <P / fW <3.1 (8)
However,
f1G is the focal length of the first lens group,
f2G is a focal length of the second lens group,
fW is the focal length of the entire zoom lens system when focusing on the farthest distance at the wide-angle end,
fT is the focal length of the entire zoom lens system when focusing on the longest distance at the telephoto end,
β2T is the lateral magnification of the second lens group when focusing on the farthest distance at the telephoto end,
β2W is the lateral magnification of the second lens group when focusing on the farthest distance at the wide-angle end,
βRFT is the lateral magnification of the object side sub lens group when the farthest distance is focused at the telephoto end,
βRFW is a lateral magnification of the object side sub-lens group when focusing on the farthest distance at the wide-angle end,
P is an actual distance along the optical axis from the object side surface to the image side surface of the reflecting member in the first lens group,
It is. 9. The optical path reflection type zoom lens according to claim 8, wherein the object side sub lens group includes a plurality of lens groups that move upon zooming from the wide-angle end to the telephoto end. 10. The optical path reflection type according to claim 9, wherein the object side sub lens group includes a positive lens group and a negative lens group which move while changing a distance between them when zooming from the wide angle end to the telephoto end. Zoom lens. The first lens group includes the reflecting member, an object side sub-lens group having a negative refractive power disposed on the object side of the reflecting member, and an image side having a positive refractive power disposed on the image side of the reflecting member. 11. The image forming apparatus according to claim 1, further comprising: a sub lens group, wherein the object side sub lens group includes one negative lens having a concave surface directed toward the image side, and the image side sub lens group includes two positive lenses. The optical path reflection type zoom lens according to any one of the above. The optical path reflection type zoom lens according to claim 1, wherein the following conditional expression (9) is satisfied.
1.2 <P / fW <5 (9)
However,
fW is the focal length of the entire zoom lens system at the wide-angle end, and the focal length when focusing on the farthest distance,
P is the actual distance along the optical axis from the object side surface to the image side surface of the reflecting member,
It is. The lens group closer to the image side than the reflecting surface in the first lens group is an image side sub-lens group,
The optical path reflection type zoom lens according to any one of claims 1 to 12, wherein the following conditional expressions (10) and (11) are satisfied.
20 <| νd1-νd2 | <70 (10)
20 <| νd1-νd3 | <70 (11)
However,
νd1 is the Abbe number based on the d-line of the negative lens closest to the object side in the first lens group,
νd2 is the Abbe number based on the positive lens d-line on the object side of the image side sub lens group in the first lens group,
νd3 is the Abbe number based on the positive lens d-line on the image side of the image side sub lens group in the first lens group,
It is. The second lens group includes, in order from the object side to the image side, a first meniscus negative lens, a second meniscus negative lens, and a positive lens.
The optical path reflection according to any one of claims 1 to 13, wherein the first meniscus negative lens and the second meniscus negative lens satisfy the following conditional expressions (12) and (13). Type zoom lens.
1 <SF21 (12)
SF22 <-1 (13)
However,
SF21 is a shape factor of the first meniscus negative lens,
SF22 is a shape factor of the second meniscus negative lens,
The paraxial radius of curvature of the object side surface of the first meniscus negative lens is R21,
The paraxial radius of curvature of the image side surface of the first meniscus negative lens is R22,
The paraxial radius of curvature of the object side surface of the second meniscus negative lens is R23,
When the paraxial curvature radius of the image side surface of the second meniscus negative lens is R24,
SF21 = (R21 + R22) / (R21−R22),
SF22 = (R23 + R24) / (R23−R24),
It is. Among the rear lens group, the lens group having negative refractive power is composed of a cemented lens in which a positive lens and a negative lens are cemented,
The optical path reflection type zoom lens according to claim 1, wherein the following conditional expression (14) is satisfied.
0.1 <| nd1-nd2 | <0.5 (14)
However,
nd1 is the refractive index at the d-line of the positive lens of the cemented lens,
nd2 is the refractive index at the d-line of the negative lens of the cemented lens,
It is. The rear lens group includes, in order from the object side to the image side, a positive lens group composed of one or two lens units having positive refractive power, a negative lens group having negative refractive power, and a positive lens group having positive refractive power. ,
The optical path reflection type zoom lens according to any one of claims 1 to 15, wherein the distance between the lens groups changes during zooming from the wide-angle end to the telephoto end. The optical path reflection type zoom lens according to claim 16, wherein the following conditional expression (15) is satisfied.
0.25 <(βRNT / βRNW) / (βRPFT / βRPFW) <7 (15)
However,
βRNT is a lateral magnification when focusing on the farthest distance at the telephoto end of the negative lens group in the rear lens group,
βRNW is the lateral magnification when focusing on the farthest distance at the wide-angle end of the negative lens group in the rear lens group,
βRPFT is the lateral magnification when focusing on the farthest distance at the telephoto end of the positive lens group in the rear lens group,
βRPFW is the lateral magnification when focusing on the farthest distance at the wide-angle end of the positive lens group in the rear lens group,
It is. The lens group having the negative refractive power in the rear lens group consists of one single lens or a cemented lens, and moves for focusing.
18. The optical path reflection type zoom lens according to claim 16, wherein the positive lens group closer to the image side than the negative lens in the rear lens group is fixed during zooming. The optical path reflection type zoom lens according to any one of claims 1 to 18,
An image pickup apparatus, comprising: an image pickup element that is disposed on an image side of the optical path reflection type zoom lens and converts an optical image formed by the optical path reflection type zoom lens into an electric signal.

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