WO2013038614A1 - ズームレンズおよび撮像装置 - Google Patents
ズームレンズおよび撮像装置 Download PDFInfo
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- WO2013038614A1 WO2013038614A1 PCT/JP2012/005562 JP2012005562W WO2013038614A1 WO 2013038614 A1 WO2013038614 A1 WO 2013038614A1 JP 2012005562 W JP2012005562 W JP 2012005562W WO 2013038614 A1 WO2013038614 A1 WO 2013038614A1
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- 238000003384 imaging method Methods 0.000 title claims description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 46
- 230000014509 gene expression Effects 0.000 claims description 26
- 230000005499 meniscus Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 abstract description 8
- 230000004075 alteration Effects 0.000 description 39
- 238000010586 diagram Methods 0.000 description 17
- 201000009310 astigmatism Diseases 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000006059 cover glass Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
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- 238000000576 coating method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144109—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +--+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/17—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +--
Definitions
- the present invention relates to a zoom lens and an image pickup apparatus, and more particularly to a zoom lens that can be suitably used for a digital camera, a video camera, a broadcast camera, and the like and an image pickup apparatus including the zoom lens.
- zoom lenses have been used in cameras in the above fields.
- the first lens group having a positive refractive power which is fixed at the time of zooming, in order from the object side, as a lens type in which the fluctuation of the angle of view at the time of focusing is small and the fluctuation of the F number at the time of zooming is small.
- a zoom lens has been proposed (see, for example, Patent Documents 1 to 3 below).
- Patent Documents 1 to 3 have a large zoom ratio, improvement in size and weight is desired in order to cope with such a use situation. Further, in the cameras in the above fields, it is desired that the angle of view changes during focusing is small.
- the present invention has been made in view of the above circumstances, and provides a zoom lens having high optical performance and a zoom lens that is small and lightweight, has little fluctuation in the angle of view during focusing, and an imaging apparatus including the zoom lens. It is for the purpose.
- the first zoom lens of the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a negative refractive power.
- the first lens group and the fourth lens group are fixed in the optical axis direction when zooming from the wide-angle end to the telephoto end.
- the second lens group is moved to the image side
- the third lens group is moved so as to correct the fluctuation of the image plane due to the movement of the second lens group
- the first lens group is sequentially moved from the object side.
- a first lens group front group having a negative refractive power From substantially three lens groups, a first lens group front group having a negative refractive power, a first lens group middle group having a positive refractive power, and a rear group of the first lens group having a positive refractive power.
- the first lens group front group is substantially composed of two negative lenses and one positive lens in order from the object side. Consists of three lenses, only the first lens group unit is moved in the optical axis direction is configured to perform focusing and is characterized by satisfying the following conditional expression (1). 2.5 ⁇ f1 / fw ⁇ 5.4 (1) However, f1: focal length of the first lens unit fw: focal length of the entire system at the wide-angle end
- the second zoom lens of the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a negative refractive power.
- the first lens group and the fourth lens group are fixed in the optical axis direction when zooming from the wide-angle end to the telephoto end.
- the second lens group is moved to the image side, the third lens group is moved so as to correct the fluctuation of the image plane due to the movement of the second lens group, and the first lens group is sequentially moved from the object side.
- a first lens group front group having a negative refractive power a first lens group middle group having a positive refractive power
- a rear group of the first lens group having a positive refractive power The first lens group front group is substantially composed of two negative lenses and one positive lens in order from the object side. Consists of three lenses, only the first lens group unit is moved in the optical axis direction is configured to perform focusing and is characterized by satisfying the following conditional expression (2). 2.5 ⁇ t1 / fw ⁇ 14.0 (2) However, t1: Distance on the optical axis from the most object side surface of the first lens unit to the most image side surface of the first lens unit fw: focal length of the entire system at the wide angle end
- the middle group of the first lens group is composed of a cemented lens in which a negative lens and a positive lens are cemented.
- the rear group of the first lens group includes, in order from the object side, a cemented lens in which a biconcave lens and a biconvex lens are cemented, a biconvex lens, and a positive meniscus lens. It is preferable.
- substantially consisting of four lens groups are “substantially consisting of”
- lenses that have substantially no power are “substantially consisting of”
- optical elements other than lenses such as a diaphragm and cover glass, lens flanges, lens barrels, image sensors, mechanical parts such as image stabilization mechanisms, And the like.
- the “lens group” does not necessarily include a plurality of lenses but also includes a single lens.
- the surface shape of the lens and the sign of refractive power are considered in the paraxial region for those including an aspherical surface.
- An image pickup apparatus includes the first or second zoom lens according to the present invention.
- the positive zoom lens of the present invention in order from the object side, the positive first lens group fixed at the time of zooming, the negative second lens group, the positive third lens group, and the fixed at the time of zooming.
- the positive fourth lens group and when zooming from the wide-angle end to the telephoto end, the second lens group moves to the image side, and the third lens group changes the image plane due to the movement of the second lens group.
- the lens system configured to correct the first lens group, the negative first lens group front group, the positive first lens group middle group, and the positive first lens group rear group in order from the object side.
- the lens configuration of the first lens group front group is suitably set, focusing is performed only by the first lens group middle group, and the conditional expression (1) is satisfied.
- there is little fluctuation in the angle of view at the time of focusing zoom with good aberration correction and high optical performance It is possible to realize a lens.
- the positive first lens group fixed at the time of zooming, the negative second lens group, the positive third lens group, and fixed at the time of zooming.
- the positive fourth lens group and when zooming from the wide-angle end to the telephoto end, the second lens group moves to the image side, and the third lens group changes the image plane due to the movement of the second lens group.
- the lens system configured to correct the first lens group, the negative first lens group front group, the positive first lens group middle group, and the positive first lens group rear group in order from the object side.
- the lens configuration of the first lens group front group is suitably set, focusing is performed only by the first lens group middle group, and the conditional expression (2) is satisfied, so that it is small and lightweight.
- there is little fluctuation of the angle of view at the time of focusing and a wide range of distance that can be imaged can be maintained, resulting in high optical performance. It is possible to realize a zoom lens having.
- the image pickup apparatus of the present invention includes the first or second zoom lens of the present invention
- the image pickup apparatus can be configured to be small and light, and the image angle at the time of focusing is small, and good imaging can be performed. .
- FIGS. 7A to 7L are diagrams showing aberrations of the zoom lens according to Example 1 of the present invention. 8A to 8L are aberration diagrams of the zoom lens according to Example 2 of the present invention.
- FIGS. 9A to 9L are diagrams showing aberrations of the zoom lens according to the third embodiment of the present invention.
- FIGS. 10A to 10L are graphs showing aberrations of the zoom lens according to Example 4 of the present invention.
- FIGS. 11A to 11L are diagrams showing aberrations of the zoom lens according to Example 5 of the present invention.
- 1 is a schematic configuration diagram of an imaging apparatus according to an embodiment of the present invention.
- FIG. 1 is a cross-sectional view illustrating a configuration example of a zoom lens according to an embodiment of the present invention, and corresponds to a zoom lens of Example 1 described later.
- the left side is shown as the object side
- the right side is shown as the image side
- the lens arrangement at the wide angle end when focusing on an object at infinity is shown.
- the zoom lens according to the present 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, and a third lens group having a negative refractive power.
- Four lens groups of G3 and a fourth lens group G4 having a positive refractive power are substantially arranged.
- FIG. 1 shows an example in which parallel plate-like optical members PP1 and PP2 are arranged between the fourth lens group G4 and the image plane Sim.
- Some recent imaging apparatuses employ a 3CCD system that uses a CCD for each color in order to improve image quality.
- a color separation optical system such as a color separation prism is used as a lens system.
- the image plane Sim When applying a zoom lens to an imaging apparatus, various filters such as a cover glass, an infrared cut filter, and a low-pass filter are provided between the optical system and the image plane Sim depending on the configuration of the camera side on which the lens is mounted. It is preferable to arrange.
- the optical members PP1 and PP2 assume these color separation optical systems, cover glasses, various filters, and the like.
- the zoom lens when zooming from the wide-angle end to the telephoto end, the first lens group G1 and the fourth lens group G4 are fixed in the optical axis direction with respect to the image plane Sim, and the second lens group G2 Is moved to the image side along the optical axis Z, and the third lens group G3 is configured to move so as to correct the fluctuation of the image plane due to the movement of the second lens group G2.
- a schematic movement locus of the second lens group G2 and the third lens group G3 when zooming from the wide-angle end to the telephoto end is indicated by a solid arrow below each lens group.
- the third lens group G3 may be configured to move to the image side after moving to the object side when zooming from the wide-angle end to the telephoto end. In this case, the movement space of the third lens group G3 required at the time of zooming can be reduced, which can contribute to downsizing in the optical axis direction.
- the first lens group G1 includes, in order from the object side, a first lens group front group G1f having negative refractive power, a first lens group middle group G1m having positive refractive power, and a first lens having positive refractive power. It consists of three lens groups, the rear lens group G1r. In the zoom lens having the four-group configuration as described above, the lens type in which the first lens group G1 is configured by such three lens groups can reduce the fluctuation of the angle of view during focusing.
- the first lens group front group G1f acts to refract the peripheral light beam incident from the object side so that the angle formed by the peripheral light beam emitted from the first lens group front group G1f and the optical axis Z becomes small. By this action, the amount of change in the height of the peripheral luminous flux in the first lens group middle group G1m can be reduced.
- the spherical aberration is favorably corrected by the first lens group rear group G1r. ing.
- This zoom lens employs a so-called inner focus system so that the lens group to be moved when performing focusing is only the first lens group G1m. A double arrow for indicating this is written below the first lens group middle group G1m in FIG.
- the first lens group front group G1f is composed of two negative lenses L11 and L12 and one positive lens L13 in order from the object side.
- the first lens group middle group G1m can be constituted by a pair of cemented lenses in which a negative lens L14 and a positive lens L15 are cemented, for example, as shown in FIG.
- a negative lens L14 and a positive lens L15 are cemented, for example, as shown in FIG.
- the first lens group middle group G1m is composed of a pair of cemented lenses
- a negative lens and a positive lens in order from the object side.
- the object distance varies. Correction of chromatic aberration at the time becomes easy.
- these lenses are preferably a negative meniscus lens and a biconvex lens with a convex surface facing the object side, respectively, and in this case, it becomes easier to correct chromatic aberration when the object distance fluctuates.
- the first lens group rear group G1r includes, in order from the object side, a cemented lens in which a biconcave lens L16 and a biconvex lens L17 are cemented, a biconvex lens L18, A positive meniscus lens L19 can be used.
- the first lens group rear group G1r has such a configuration, the amount of spherical aberration on the telephoto side can be suppressed.
- the first lens group G1 includes the lenses L11 to L19 as described above, and includes the first lens group front group G1f, the first lens group middle group G1m, and the first lens group rear group G1r.
- the power distribution of the first lens group G1 with respect to the entire system is important, and it is preferable that the following conditional expression (1) is satisfied. 2.5 ⁇ f1 / fw ⁇ 5.4 (1)
- f1 Focal length of the first lens group G1
- fw Focal length of the entire system at the wide angle end
- conditional expression (1) If the lower limit of conditional expression (1) is not reached, the refractive power of the first lens group G1 becomes excessive, and it becomes difficult to correct astigmatism and field curvature at the wide-angle end, and to correct spherical aberration at the telephoto end.
- the upper limit of conditional expression (1) When the upper limit of conditional expression (1) is exceeded, the positive refractive power of the first lens group G1 becomes weak, the total length of the lens system becomes long, the distance from the aperture stop St to the first lens group G1 becomes long, The lens diameter of one lens group G1 increases, the thickness increases, and the weight increases. In addition, when the length and diameter of the lens system in the optical axis direction are increased, the weight of a lens holding member such as a lens barrel is increased. By satisfying conditional expression (1), it is possible to reduce the size and weight while satisfactorily correcting aberrations.
- conditional expression (1 ′) it is more preferable to satisfy the following conditional expression (1 ′) in place of the conditional expression (1) in order to reduce the size and weight while favorably correcting aberrations.
- this zoom lens satisfies the following conditional expression (2).
- t1 Distance on the optical axis from the most object-side surface of the first lens group G1 to the most image-side surface of the first lens group G1
- fw focal length of the entire system at the wide-angle end
- conditional expression (2) If the lower limit of conditional expression (2) is not reached, it is impossible to secure an air space for focusing, and it is not possible to shorten the closest distance that can be focused. If the upper limit of conditional expression (2) is exceeded, the length of the first lens group G1 in the optical axis direction is increased, the thickness of the lens of the first lens group G1 is increased, the diameter is increased, and the weight is increased. By satisfying conditional expression (2), it is possible to reduce the size and weight while keeping a wide range of distances that can be imaged.
- conditional expression (2) it is more preferable to satisfy the following conditional expression (2 ′) in place of conditional expression (2) in order to further reduce the size and weight while maintaining a wide range of distance that can be imaged.
- conditional expression (2) it is more preferable to satisfy the following conditional expression (2 ′) in place of conditional expression (2) in order to further reduce the size and weight while maintaining a wide range of distance that can be imaged.
- the second lens group G2 can have a four-lens configuration in which negative lenses L21 and L22, a positive lens L23, and a negative lens L24 are arranged in order from the object side, for example, as in the example illustrated in FIG. .
- the negative lens L22 and the positive lens L23 may be cemented.
- at least one surface of the lens L21 may be an aspherical surface, and when configured in this way, it becomes easy to suppress fluctuations in aberrations during zooming.
- the aspherical surface is formed only in the entire system on the object side surface of the lens L21 of the second lens group G2, and the other lens surfaces are all spherical.
- the cost can be reduced by providing the second lens group G2 with the surface forming the aspherical surface instead of the first lens group G1 having the large diameter.
- the surface on which the aspherical surface is provided is not limited to the above example.
- another surface may be an aspherical surface, and in that case, aberration correction can be performed better.
- 3rd lens group G3 can be comprised so that it may consist of negative lens L31 like the example shown, for example in FIG. Since the third lens group G3 that moves at the time of zooming has a single lens configuration, the drive mechanism can be simplified, and the apparatus can be reduced in size and weight.
- the fourth lens group G4 includes, in order from the object side, positive lenses L41, L42, L43, L44, L45, a negative lens L46, a positive lens L47, a negative lens L48,
- An 11-lens configuration in which a positive lens L49, a negative lens L50, and a positive lens L51 are arranged can be employed.
- the aperture stop St is disposed on the image side from the third lens group G3 and is fixed at the time of zooming.
- the F number can be made constant during zooming.
- the aperture stop St is disposed between the third lens group G3 and the fourth lens group G4. Note that the aperture stop St shown in FIG. 1 does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.
- the zoom lens of the present embodiment it is possible to reduce the variation in the angle of view at the time of focusing and achieve high optical performance while reducing the size and weight.
- the zoom lens of the present embodiment is suitable as a zoom lens having a zoom magnification of about 2.5 to 3 times and a total angle of view of about 60 ° at the wide angle end, for example.
- a protective multilayer coating is preferably applied. Further, in addition to the protective coat, an antireflection coat for reducing ghost light during use may be applied.
- the optical members PP1 and PP2 are arranged between the lens system and the imaging plane.
- these various filters may be arranged between the lenses, or a coating having the same action as the various filters may be applied to the lens surface of any lens.
- FIGS. 2 to 6 show lens cross-sectional views when focusing on an object at infinity of the zoom lenses of Examples 1 to 5, respectively.
- the lens arrangement at the wide-angle end, intermediate focal length state, and telephoto end of the zoom lens of Example 1 is shown in the upper, middle, and lower stages of FIG. Between the upper stage and the middle stage, between the middle stage and the lower stage, rough movement directions of the second lens group G2 and the third lens group G3, which are moving groups during zooming, are indicated by arrows below the respective lens groups. . Further, a double-headed arrow indicating movement during focusing is shown below the cemented lens corresponding to the above-described first lens group in the first group in FIG.
- Table 1 shows basic lens data at the time of focusing on an object at infinity of the zoom lens of Example 1.
- the Ri column shows the radius of curvature of the i-th surface
- the Di column shows the surface spacing on the optical axis Z between the i-th surface and the i + 1-th surface.
- the numerical value in the bottom column of Di indicates the surface interval between the final surface in the table and the image surface Sim.
- the sign of the radius of curvature is positive when the surface shape is convex on the object side and negative when the surface shape is convex on the image side.
- the ⁇ dj column indicates the Abbe number of the j-th component with respect to the d-line
- the ⁇ g and Fj columns indicate the j-th component g-line (wavelength 435.8 nm). )
- F line the refractive index with respect to the wavelength 587.6 nm
- the partial dispersion ratio between the g-line and the F-line is that the refractive index at the g-line is Ng, the refractive index at the F-line (wavelength 486.1 nm) is NF, and the refractive index at the C-line (wavelength 656.3 nm) is NC. Is represented by (Ng-NF) / (NF-NC).
- the basic lens data includes the aperture stop St and the optical members PP1 and PP2, and the word “St” is also described in the surface number column of the surface corresponding to the aperture stop St. .
- the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, and the distance between the third lens group G3 and the aperture stop St change during zooming.
- DD [16], DD [23], and DD [25] are described in the column of the surface spacing corresponding to these, respectively.
- the surface number of the aspheric surface is marked with *, and the numerical value of the paraxial curvature radius is shown as the curvature radius of the aspheric surface.
- Table 2 shows specifications and zoom intervals at the wide-angle end, the intermediate focal length state, and the telephoto end of the zoom lens of Example 1.
- the specification table includes zoom magnification (magnification ratio), focal length f 'of the entire system, back focus Bf' (air conversion distance), F number Fno. The value of the half angle of view ⁇ is shown.
- the values in the table of specifications are related to the d-line.
- the zoom interval table shows the values of the surface intervals of the above DD [16], DD [23], and DD [25].
- Table 3 shows the surface number of the aspheric surface of the zoom lens of Example 1 and the aspheric coefficient of the aspheric surface.
- the numerical value “En” (n: integer) of the aspheric coefficient in Table 3 means “ ⁇ 10 ⁇ n”.
- Zd Depth of aspheric surface (length of perpendicular drawn from a point on the aspherical surface at height Y to a plane perpendicular to the optical axis where the aspherical vertex touches)
- Y Height (distance from the optical axis to the lens surface)
- C paraxial curvature K
- the first lens group G1 having a positive refractive power
- the second lens group G2 having a negative refractive power
- the third lens group having a negative refractive power G3 and a fourth lens group G4 having a positive refractive power.
- the first lens group G1 and the fourth lens group G4 are light beams with respect to the image plane Sim.
- the second lens group G2 moves to the image side along the optical axis Z
- the third lens group G3 has an optical axis so as to correct image plane variation due to the movement of the second lens group G2. Configured to move in the direction.
- the first lens group G1 has negative refractive power in order from the object side, and is a first lens including two negative lenses and one positive lens in order from the object side.
- the first lens group middle group G1m is composed of three lens groups: a front group G1f, a first lens group middle group G1m having a positive refractive power, and a first lens group rear group G1r having a positive refractive power. Only the lens is moved in the optical axis direction to perform focusing.
- Table 16 shows values corresponding to the conditional expressions (1) and (2) of the zoom lenses of Examples 1 to 5 described above. The values in Table 16 relate to the d line.
- 7A to 7E show spherical aberration, sine condition violation amount, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification), respectively, at the wide-angle end of the zoom lens of Example 1.
- 7 (F) to FIG. 7 (J) show spherical aberration, sine condition violation amount, astigmatism, distortion (distortion), and lateral chromatic aberration (chromatic aberration of magnification), respectively, at the telephoto end.
- the spherical aberration, sine condition violation amount, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) are shown in FIGS. 7 (K) to 7 (O), respectively. All aberration diagrams are for focusing on an object at infinity.
- Each aberration diagram is based on the d-line, but the spherical aberration diagram also shows aberrations related to the g-line and C-line, and the lateral chromatic aberration diagram shows aberrations related to the g-line and C-line when the d-line is used as a reference.
- the sagittal direction is indicated by a solid line
- the tangential direction is indicated by a broken line.
- Fno Of spherical aberration diagram. Means F number, and ⁇ in other aberration diagrams means half angle of view.
- FIGS. 8A to 8O show aberration diagrams at the wide-angle end, intermediate focal length state, and telephoto end of the zoom lens of Example 2
- FIGS. 8A to 8O show aberration diagrams at the wide-angle end, intermediate focal length state, and telephoto end of the zoom lens of Example 3
- FIG. 9A to FIG. 9O show aberration diagrams at the focal length state and the telephoto end
- FIG. 10A shows aberration diagrams at the wide angle end, the intermediate focal length state, and the telephoto end of the zoom lens of Example 4.
- FIGS. 11A to 11O show aberration diagrams at the wide-angle end, the intermediate focal length position, and the telephoto end of the zoom lens of Example 5 shown in FIGS.
- FIG. 12 shows a schematic configuration diagram of an imaging apparatus 10 using the zoom lens 1 according to the embodiment of the present invention as an example of the imaging apparatus of the embodiment of the present invention.
- the imaging device include a digital camera, a video camera, and a broadcast camera.
- An imaging apparatus 10 illustrated in FIG. 11 includes a zoom lens 1, a filter 2 disposed on the image side of the zoom lens 1, an imaging element 3 that captures an image of a subject formed by the zoom lens 1, and an imaging element 3.
- a signal processing unit 4 that performs arithmetic processing on the output signal from the zoom lens 1, a zooming control unit 5 that performs zooming of the zoom lens 1, and a focus control unit 6 that performs focusing.
- the zoom lens 1 includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, and a positive lens group. And a fourth lens group G4 having refractive power.
- the first lens group G1 includes a first lens group front group G1f having negative refractive power, a first lens group middle group G1m having positive refractive power, and a first lens group rear group G1r having positive refractive power. And three lens groups.
- FIG. 12 schematically shows each lens group.
- the zooming operation is performed by moving the second lens group G2 and the third lens group G3 in the optical axis direction by the zooming control unit 5.
- the focus adjustment is performed by moving the first lens group middle group G1m in the optical axis direction by the focus control unit 6.
- the image pickup device 3 picks up an optical image formed by the zoom lens 1 and outputs an electrical signal, and the image pickup surface thereof is arranged to coincide with the image surface of the zoom lens 1.
- a CCD or a CMOS can be used as the imaging element 3.
- the imaging apparatus 10 further includes a shake correction control unit that corrects shake of the captured image during vibration or camera shake by moving some of the components in a direction intersecting the optical axis. You may make it prepare.
- the present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made.
- the values of the radius of curvature, the surface interval, the refractive index, the Abbe number, the aspherical coefficient, etc. of each lens are not limited to the values shown in the above numerical examples, and can take other values.
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Abstract
Description
2.5<f1/fw<5.4 … (1)
ただし、
f1:第1レンズ群の焦点距離
fw:広角端における全系の焦点距離
2.5<t1/fw<14.0 … (2)
ただし、
t1:第1レンズ群の最も物体側の面から第1レンズ群の最も像側の面までの光軸上の距離
2.5<t1/fw<14.0 … (2)
ただし、
t1:第1レンズ群の最も物体側の面から第1レンズ群の最も像側の面までの光軸上の距離
fw:広角端における全系の焦点距離
2.5<f1/fw<3.5 … (1’)
ただし、
f1:第1レンズ群の焦点距離
2.5<t1/fw<4.0 … (2’)
ただし、
t1:第1レンズ群の最も物体側の面から第1レンズ群の最も像側の面までの光軸上の距離
2.5<f1/fw<5.4 … (1)
ただし、
f1:第1レンズ群G1の焦点距離
fw:広角端における全系の焦点距離
2.5<f1/fw<3.5 … (1’)
2.5<t1/fw<14.0 … (2)
ただし、
t1:第1レンズ群G1の最も物体側の面から第1レンズ群G1の最も像側の面までの光軸上の距離
fw:広角端における全系の焦点距離
2.5<t1/fw<4.0 … (2’)
Zd:非球面深さ(高さYの非球面上の点から、非球面頂点が接する光軸に
垂直な平面に下ろした垂線の長さ)
Y:高さ(光軸からのレンズ面までの距離)
C:近軸曲率
K、Am:非球面係数(m=4、6、8、10、12、14、16、18、20)
Claims (8)
- 物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、負の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群との実質的に4つのレンズ群からなり、
広角端から望遠端に変倍する際に、前記第1レンズ群および前記第4レンズ群が光軸方向について固定されており、前記第2レンズ群が像側へ移動し、前記第3レンズ群が前記第2レンズ群の移動による像面の変動を補正するように移動し、
前記第1レンズ群が、物体側から順に、負の屈折力を有する第1レンズ群前群と、正の屈折力を有する第1レンズ群中群と、正の屈折力を有する第1レンズ群後群との実質的に3つのレンズ群からなり、
前記第1レンズ群前群が、物体側から順に、2枚の負レンズと、1枚の正レンズとの実質的に3つのレンズからなり、
前記第1レンズ群中群のみを光軸方向に移動させてフォーカシングを行うように構成されており、
下記条件式(1)を満足することを特徴とするズームレンズ。
2.5<f1/fw<5.4 … (1)
ただし、
f1:前記第1レンズ群の焦点距離
fw:広角端における全系の焦点距離 - 下記条件式(2)を満足することを特徴とする請求項1記載のズームレンズ。
2.5<t1/fw<14.0 … (2)
ただし、
t1:前記第1レンズ群の最も物体側の面から前記第1レンズ群の最も像側の面までの光軸上の距離 - 物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、負の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群との実質的に4つのレンズ群からなり、
広角端から望遠端に変倍する際に、前記第1レンズ群および前記第4レンズ群が光軸方向について固定されており、前記第2レンズ群が像側へ移動し、前記第3レンズ群が前記第2レンズ群の移動による像面の変動を補正するように移動し、
前記第1レンズ群が、物体側から順に、負の屈折力を有する第1レンズ群前群と、正の屈折力を有する第1レンズ群中群と、正の屈折力を有する第1レンズ群後群との実質的に3つのレンズ群からなり、
前記第1レンズ群前群が、物体側から順に、2枚の負レンズと、1枚の正レンズとの実質的に3つのレンズからなり、
前記第1レンズ群中群のみを光軸方向に移動させてフォーカシングを行うように構成されており、
下記条件式(2)を満足することを特徴とするズームレンズ。
2.5<t1/fw<14.0 … (2)
ただし、
t1:前記第1レンズ群の最も物体側の面から前記第1レンズ群の最も像側の面までの光軸上の距離
fw:広角端における全系の焦点距離 - 前記第1レンズ群中群が、負レンズと正レンズが接合された接合レンズからなることを特徴とする請求項1から3のいずれか1項に記載のズームレンズ。
- 前記第1レンズ群後群が、物体側から順に、両凹レンズと両凸レンズが接合された接合レンズと、両凸レンズと、正メニスカスレンズとからなることを特徴とする請求項1から4のいずれか1項に記載のズームレンズ。
- 下記条件式(1’)を満足することを特徴とする請求項1から5のいずれか1項に記載のズームレンズ。
2.5<f1/fw<3.5 … (1’)
ただし、
f1:前記第1レンズ群の焦点距離 - 下記条件式(2’)を満足することを特徴とする請求項1から6のいずれか1項に記載のズームレンズ。
2.5<t1/fw<4.0 … (2’)
ただし、
t1:前記第1レンズ群の最も物体側の面から前記第1レンズ群の最も像側の面までの光軸上の距離 - 請求項1から7のいずれか1項に記載のズームレンズを備えたことを特徴とする撮像装置。
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JP2013533476A JP5777225B2 (ja) | 2011-09-16 | 2012-09-03 | ズームレンズおよび撮像装置 |
CN201280045141.4A CN103797397B (zh) | 2011-09-16 | 2012-09-03 | 变焦镜头和成像设备 |
US14/217,847 US8922906B2 (en) | 2011-09-16 | 2014-03-18 | Zoom lens and imaging apparatus |
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Also Published As
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CN103797397A (zh) | 2014-05-14 |
US8922906B2 (en) | 2014-12-30 |
JPWO2013038614A1 (ja) | 2015-03-23 |
JP5777225B2 (ja) | 2015-09-09 |
US20140198394A1 (en) | 2014-07-17 |
CN103797397B (zh) | 2016-03-30 |
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