JP2000019575A - Camera with vibration-proof function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera with a vibration-proof function by which a user does not miss a shutter chance and which is prevented from being large- sized because a dedicated member is needed in the camera incorporating a conversion lens. SOLUTION: The conversion lens 18 is provided so that it can move between an inserting position obtained when the lens 18 is inserted inside the optical system of the camera and a retreating position obtained when the lens 18 is retreated outside the optical system. This camera is provided with a photographing optical system whose focal distance is changed by the inserting/ retreating of the lens 18. The lens 18 is driven by a correcting motor 29, driving transmitting gears 28 and 27, a shaft 25, a correction motor 35, driving transmitting gears 34 and 33, and a shaft 31 when the lens 18 is in an inserting position condition and in the middle of photographing exposure, so that photographing image blur in the case of photographing can be corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a zoom lens integrated into a main body, and more particularly to a camera having a zoom lens system having a rear conversion lens inserted thereinto and with a vibration reduction function.

[0002]

2. Description of the Related Art There is known a camera in which a zoom lens having a variable focal length is provided integrally with a camera body. In such a camera with a built-in zoom lens, a zoom lens with a large zoom ratio cannot be mounted due to the limitation of the size of the whole camera.

Therefore, a conversion lens (rear conversion lens) is mounted on the rear side of the zoom lens, that is, on the film side in the case of a silver halide camera, or a conversion lens (front conversion lens) is mounted on the front side of the zoom lens, that is, on the subject side. ) Is attached to the zoom lens to perform zooming in a range different from the zooming range of only the zoom lens.

[0004] On the other hand, various cameras with an image stabilizing function have been developed to correct camera shake during photographing. For example, there is known a camera capable of fixing a movement of a subject by moving a part of a lens and obtaining a blur-corrected photograph as a still image even when the camera is blurred at the time of shooting.

Japanese Patent Application Laid-Open No. 50-80147 discloses a zoom lens having two afocal power varying systems.
There is disclosed an anti-shake technique in combination with a gyro that stabilizes an image by correcting a second afocal group.

Japanese Unexamined Patent Application Publication No. 7-168135 discloses a technique for correcting a camera shake by moving a part of lens groups in a direction perpendicular to an optical axis in a detachable rear conversion lens. Have been.

[0007]

However, the technique described in Japanese Patent Application Laid-Open No. 50-80147 described above is a vibration isolator using a gyro, and therefore requires a complicated dedicated member such as a gyro in the camera. And it is difficult to reduce the size.

In the technique described in Japanese Patent Application Laid-Open No. Hei 7-168135, since a separate conversion lens is used, a dedicated driving member must be built in, and the apparatus becomes large. In addition, complicated operations such as attachment and detachment are required, and it is easy to miss a shutter chance. Furthermore, the specific configuration of the driving member is not described.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a camera having a built-in conversion lens, an image stabilizing function that does not miss a photo opportunity and does not require an exclusive member to increase the size of the apparatus. It is an object of the present invention to provide a camera with a camera.

[0010]

That is, the present invention includes a conversion lens movably provided between an insertion position inserted into an optical system and a retracted position retracted outside the optical system. In a camera having a photographic optical system in which the focal length is changed by inserting / retracting the conversion lens, the conversion lens is in the insertion position state, and during the photographic exposure, the conversion lens is driven to perform And a converter driving means for correcting the blur of the photographed image.

Further, the present invention has a conversion lens movably provided between an insertion position inserted into the optical system and a retracted position retracted outside the optical system, and inserts / retracts the conversion lens. In a camera having a photographing optical system in which the focal length is changed by a driving means, a driving means for driving the insertion / retraction of the conversion lens by a driving source, and the driving source when the conversion lens is in the inserted state. And a blur correction driving unit for driving the conversion lens to correct a blur of a captured image at the time of shooting.

In the present invention, the conversion lens is movably provided between the insertion position inserted into the optical system of the camera and the retracted position retracted outside the optical system. Further, it has an imaging optical system whose focal length is changed by inserting / retracting the conversion lens. Then, in this camera, the conversion lens is in the insertion position state, and during the photographing exposure, the conversion lens is driven by the converter driving means to correct the blur of the photographed image at the time of photographing.

In the present invention, the conversion lens is movably provided between an insertion position inserted into the optical system of the camera and a retracted position retracted outside the optical system. This camera also has a photographing optical system whose focal length is changed by inserting / retracting a conversion lens. Then, the driving means drives the insertion / retreat driving of the conversion lens by the driving source.
When the conversion lens is in the inserted state, the conversion lens is driven by the drive source, and blurring of a shot image at the time of shooting is corrected by a blur correction driving unit.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a side view of the camera according to the first embodiment of the present invention. In the camera body 1, a lens barrel 3 containing a zoom lens optical system (main lens) for moving and zooming by moving a plurality of lens groups including a first group frame 2 is rotated in the direction of arrow C in the figure. A conversion lens frame 4 which is movably provided and on which a conversion lens, which will be described in detail later, is mounted.

The light from the subject passing through the conversion lens frame 4 is reflected by a quick return mirror 5 rotatably supported by the camera body 1, and a screen 6 and a pentaprism forming a finder optical system. 7 and a finder eyepiece optical system 8. On the other hand, behind the quick return mirror 5, a focal plane shutter 9 and a film 10 are further disposed.

Above the camera body 1, there is provided a retractable strobe 12 rotatable about a shaft 11. At the tip of the retractable strobe 12, a strobe light emitting section 13 built in the camera body 1 is integrally formed.

The conversion lens frame 4 is provided so as to be insertable into and removable from the optical path on the image plane side of the main lens. When the conversion lens frame 4 is inserted into the optical path of the main lens, the magnification of only the main lens is changed. A conversion lens for performing zooming in a range different from the range is attached.

That is, the conversion lens frame 4 is
As shown by a broken line in FIG. 2, it is possible to enter the optical axis of the photographing zoom lens or to retreat to a space between the strobe light emitting unit 13 and the pentaprism 7 as shown by a solid line in FIG. I have. Here, the conversion lens frame 4 has a lens that makes the focal length of the main lens 2.2 times. Therefore, when the conversion lens frame 4 is inserted on the optical axis of the main lens (the position shown by the broken line in FIG. 2), the focal length of the camera is equal to the main lens × 2.
It becomes 2.

FIG. 3 is a perspective view showing the essential parts of the camera in a transparent manner. In FIG. 3, the main lens 15 is
It comprises a first group lens 16 on the subject side and a second group lens 17 behind the first group lens. A conversion lens 18 is disposed behind the main lens 15. This conversion lens 18 is 2.2
In addition to the magnification changing function, a blur correction function including correction driving units 19 and 20 that are converter driving means or shake correction driving means is provided. In addition, these correction driving units 19
And 20 in the camera to correspond to
Shake detectors 21 and 22 for detecting direction shake
Are provided in the camera body 1.

For example, the shake detecting section 21 detects a shake in the Y direction, which will be described later.
The image is corrected by the shake correcting unit 19. Similarly, the shake detecting unit 22 detects a shake in the X direction described later, and the shake in the X direction is corrected by the shake correcting unit 20.

Since the conversion lens 18 is of an afocal type, as shown in FIG. 3, when the lens is inserted on the optical axis, the camera is finely driven in a direction to cancel the camera shake, thereby correcting the camera shake. It is possible to do.

The correction driving units 19 and 20 are composed of, for example, an actuator such as a motor, a driving force transmission mechanism, and the like.
8 is driven.

Although it is known that blur correction can be performed in such an afocal system, in the present invention, correction is performed using a built-in conversion lens that can be inserted and removed.

FIG. 4 is a diagram showing the concept of blur correction according to the present invention. In the camera, when the optical axis of the photographing lens is the Z axis, and the X axis and the Y axis orthogonal to the Z axis are defined as shown in FIG. 4, the arrow around the Y axis (the yaw direction) becomes The corresponding rotational movement is θ _A , and the rotational movement corresponding to the arrow about the X axis (pitch direction) is θ _B. Then, the image can be corrected by appropriate driving of the two.

This makes it possible to correct around the X axis and around the Y axis. FIG. 5 is a diagram schematically showing the movement amount of the lens. In this case, the main lens in the lens barrel 3 is
For example, a cam groove (not shown) including a front group having a negative refractive power of one and two groups of five lens groups and a rear group having a positive refractive index of three, four, and five groups By rotating a rotating frame (not shown) provided in the circumferential direction, the cam followers protruding from each lens group frame move along the cam groove, so that each lens group moves in the optical axis direction. . Details of the lens movement by such a configuration are known as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-79810, and therefore, the details are omitted here.

FIGS. 5A to 5C show a state in which the conversion lens 18 is not inserted on the optical path. Therefore, the focal length of the zoom lens is 28 mm to 1
The range is 10 mm.

That is, as shown in FIG. 5A, the main lens is positioned at a wide end (focal length: 28 mm in FIG. 4) with respect to the positional relationship at the wide end. In the standard (Standard) focal length (50 mm focal length) shown in (b), the front group is moved to the film surface side, and the rear group is moved to the subject side. Also, at the focal length (focal length 110 mm) at the telephoto end shown in FIG. 5C, the front group is returned to the subject side, and the rear group is further moved to the subject side.

When the conversion lens 18 is inserted on the optical path, as shown in FIGS. 5 (d) to 5 (f), the main lens includes the front group at the wide end, the standard end, and the tele end, respectively. While the respective positional relationships of the and the rear group are maintained, the whole is further fed to the subject side (forward). In this case, since the conversion lens 18 has a magnification of 2.2 times, the focal length of 28 mm to 110 mm changes to a focal length of 62 mm to 242 mm as shown in FIG.

In FIG. 5, the teleconverter is
This indicates that the conversion lens 18 is inserted on the telephoto side. The conversion lens in the present invention is the same as a teleconverter lens, a rear converter lens, and a wide converter lens.

As described above, by using the conversion lens 18, it is possible to perform photographing on the long focal length side with respect to the photographing range of the main lens. With the camera having such a configuration, it is possible to realize a camera that is small and simple and has a wide focal length range.

FIG. 1 is a perspective view showing a conversion lens 18 and a mechanical system around it. In FIG. 1, a conversion lens 18 is disposed behind the main lens 15 having the Z axis as an optical axis. The conversion lens 18 is attached to one end of a shaft 25 extending in the Y-axis direction. The other end of the shaft 25 is rotatably supported by a lens rotating member 26. The shaft 25 is provided with a bevel-shaped drive transmission gear 27. When the drive transmission gear 27 and the drive transmission gear 28 mesh with each other, the correction motor 2
9 is transmitted to the conversion lens 18 via the shaft 25.

On the other hand, the lens rotating member 26 is attached to a shaft 31 extending in the X-axis direction. The other end of the shaft 31 is rotatably supported by a support arm 32 serving as a driving unit. The above shaft 3
1 is provided with a bevel-shaped drive transmission gear 33.
When the drive transmission gear 33 and the drive transmission gear 34 mesh with each other, the drive force from the correction motor 35 is applied to the shaft 3.
1 is transmitted to the lens rotating member 26.

The front end of the support arm 32 is a driven gear portion having a gear groove formed therein, and is rotatable about a shaft 32a by meshing with a conversion lens insertion / removal drive portion 36. The conversion lens insertion / removal driving unit 36 is for transmitting a driving force from a driving source (not shown). Therefore, a driving force from a driving source (not shown) is transmitted from the conversion lens driving unit 36 to the support arm 32 via the driven gear of the support arm 32. Thereby, the conversion lens 18
Can be inserted into and removed from the optical path of the main lens 15.

FIG. 7 is a perspective view for explaining the movement of the conversion lens 18. As shown in FIG. First, an operation of rotating the conversion lens 18 in the Y-axis direction will be described. When the correction motor 29 is driven, the shaft 25 is rotated in a predetermined direction via the drive transmission gear 28 and the drive transmission gear 27. In conjunction with the rotation of the shaft 25, the conversion lens 18, the rotational movement is provided corresponding to theta _A direction of the Y axis.

On the other hand, when the correction motor 35 is driven, the shaft 31 is rotated in a predetermined direction via the drive transmission gear 34 and the drive transmission gear 33. In conjunction with the rotation of the shaft 31, the conversion lens 18, the rotational movement is provided corresponding to theta _B direction of the X axis.

FIG. 8 is a block diagram showing a configuration of a control system of the camera according to the present embodiment. In FIG. 8, the output of the shake detection unit 41 is sent to the drive signal determination unit 43 via the calculation unit 42. The output of the drive signal determination unit 43 is supplied to the conversion lens 45 via the drive unit 44.

The shake detecting section 41 corresponds to the shake detecting sections 21 and 22 in FIG. When the camera shake is detected by the camera shake detection unit 41, a signal corresponding to the detected camera shake amount is supplied to the calculation unit 42. Then, the calculation unit 42 calculates a shake correction amount for canceling the detected shake amount, and supplies the result to the drive signal determination unit 43 to determine the shake correction amount.

The driving unit 44 is the correction driving unit 1 shown in FIG.
9 and 20. The drive section 44 drives the conversion lens 45 in a predetermined direction based on the determined blur correction amount. Thereby, the blur detected by the blur detection unit 41 can be corrected.

Although shown by a broken line in FIG.
The driving state detection unit 46 outputs the correction driving amount signal input to
It is also possible to monitor with. In this case, when the driving state is detected, feedback is performed to the driving signal determination unit 43, and more accurate blur correction can be performed.

As described above, according to the first embodiment,
There is no need to provide a dedicated lens group for image stabilization,
It can be realized extremely small and inexpensive. Also,
The conversion lens is of the tele type, and if the focal length is on the tele side and blurring is likely to occur,
By using the correction function, it is possible to perform shooting in which blur has been corrected.

Next, a second embodiment of the present invention will be described. FIG. 9 is a perspective view showing a conversion lens 18 according to the second embodiment and a mechanical system around the conversion lens 18.

In the second embodiment, one of the features of the present invention is to perform the insertion / removal drive and the blur correction drive of the conversion lens built in the camera by the same drive source.

In FIG. 9, a conversion lens 58 having an optical axis on the Z axis has a shaft 5 extending in the Y axis direction.
1 is attached to one end. Also, this shaft 51
Is rotatably supported by the lens rotating member 52. The shaft 51 has a bevel-shaped drive transmission gear 5
3 are provided. When the drive transmission gear 53 and the drive transmission gear 54 mesh with each other, the drive force from the correction motor 55 is transmitted to the conversion lens 58 via the shaft 51.

On the other hand, the lens rotating member 52 is attached to one end of a support arm 57. The other end of the support arm 57 is a driven gear having a gear groove. The driven gear section meshes with the conversion lens insertion / removal drive section 36, thereby forming the arrow D shown in the figure.
It is rotatable in the direction.

Accordingly, a driving force from a driving source (not shown) is transmitted from the conversion lens driving section 36 to the support arm 57 via the driven gear section of the support arm 57. Thereby, the conversion lens 18 can be inserted into and removed from the optical path of the main lens 15.

In the case of blur correction about the Y axis, the driving force due to the rotation of the correction motor 55 is applied to the drive transmission gear 54.
The power is transmitted to the shaft 51 via the drive transmission gear 53 and further provided to the conversion lens 58 in conjunction with the rotation of the shaft 51.

On the other hand, with respect to shake correction around the X axis, a driving force from a driving source (not shown) is applied from the conversion lens driving unit 36 via a driven gear of the support arm 57.
The light is transmitted to the lens rotating member 52 integrated with the support arm 57. Then, from the lens rotating member 52 to the shaft 5
Rotational movement about the X-axis is given to the conversion lens 58 via 1.

The driving source corresponds to the driving section 44 shown in FIG. In this case, the driving unit 44 is connected by using a stepping motor or an ultrasonic motor, thereby enabling a large rotational movement at the time of inserting and removing the conversion lens and a small vibration drive for blur correction.

FIG. 10 is a view for explaining shake correction around the X-axis in the second embodiment, and shows a normal state in which the conversion lens is inserted on the optical path.

FIG. 10A is a diagram showing a normal state in which no blur occurs. The conversion lens in the lens rotation member 52 and the film imaging plane 60 are equidistant. In this case, no blur correction is performed.

FIG. 10B is a diagram showing a state in which blurring in the θ _{B (1)} direction has occurred. From the normal state shown by the dashed line in the figure, blur correction is performed to offset blur in the pitch direction θ _{B (1)} .

FIG. 10C is a diagram showing a state in which the shake in the θ _{B (2)} direction has occurred. From the normal state shown by the broken line in the figure, the blur correction for canceling the blur in the pitch direction θB ₍₂₎ is performed.

As described above, according to the second embodiment,
By using a stepping motor or an ultrasonic motor for the drive unit 44, a large rotational movement when inserting and removing the conversion lens and θ _{B (1)} as shown in FIGS. Driving like θ _{B (2)} becomes possible.

Further, in the above-described embodiment, a camera incorporating a conversion lens has been described. However, the present invention is not limited to this. For example, the present invention is applicable to another optical device capable of inserting and removing a conversion lens on an optical path. Is also applicable.

According to the above embodiment of the present invention, the following configuration can be obtained. (1) In a camera having a conversion lens built in the main body and configured to be capable of being driven to be inserted into and removed from the photographic optical system, separately from the above-described insertion and removal driving, the camera can be used in a direction for correcting a blur of a photographed image during photographing. And a drive mechanism for driving the conversion lens.

(2) In a camera having a conversion lens built in the main body and configured to be able to be inserted into and removed from the photographing optical system, at least two axes orthogonal to the optical axis of the photographing optical system. A camera with an anti-vibration function, comprising a driving mechanism for driving the conversion lens around the camera.

(3) A detection unit for detecting camera shake and a correction optical system for correcting camera shake at the time of photographing exposure are provided. The correction optical system is inserted / retracted with respect to the optical path of the photographing optical system. A camera with an anti-vibration function characterized by being freely configured.

(4) In a camera having a conversion lens built in the main body and configured to be capable of being inserted / retracted into the photographing optical system, a drive source for driving the conversion lens to perform the insertion / retreat, and the conversion A camera with a vibration reduction function, comprising: a shake correction drive mechanism for correcting the camera shake by driving the conversion lens by the drive source when the lens is in the inserted state.

(5) A conversion lens movably provided between an insertion position inserted into the optical system and a retracted position retracted out of the optical system, and a part of the optical system is detected by detecting a camera shake amount. In a camera with an image stabilization function having a shake correction mechanism that corrects camera shake by performing correction driving, the shake correction mechanism can be operated only when the conversion lens is in the insertion position state. Camera with anti-shake function.

(6) There is a conversion lens movably provided between an insertion position inserted into the optical system and a retracted position retracted outside the optical system, and the focal point is formed by inserting / retracting the conversion lens. In a camera having a photographing optical system in which the distance is changed, the camera further comprises a driving unit for driving the conversion lens and correcting camera shake only when the conversion lens is in the insertion position state. Camera with anti-shake function.

(7) A conversion lens is provided movably between an insertion position inserted into the optical system and a retracted position retracted out of the optical system, and a focal point is formed by inserting / retracting the conversion lens. In a camera having a photographing optical system in which a distance is changed, a blur detecting means for detecting a blur state of a photographed image at the time of photographing, and a calculating means for calculating a blur correction driving amount based on an output of the blur detecting means. ,
Based on the blur correction drive amount, a converter drive unit that drives the conversion lens in a predetermined direction, a drive state detection unit that detects a drive state of the conversion lens, and a drive state detection unit that corresponds to an output result of the drive state detection unit. And a control means for controlling the driving of the converter driving means.

(8) A conversion lens is provided movably between an insertion position inserted into the optical system and a retracted position retracted out of the optical system, and a focal point is formed by inserting / retracting the conversion lens. In a camera having a photographing optical system in which a distance is changed, a driving source for inserting / retracting the conversion lens and a converter driving unit for driving the conversion lens in a predetermined direction by a driving force of the driving source are provided. When the conversion lens is in the insertion position and during exposure for photographing, the conversion lens is driven to correct blurring of a photographed image during photographing. Camera with function.

[0063]

As described above, according to the present invention, in a camera having a built-in conversion lens, a camera with an anti-shake function which does not miss a photo opportunity and requires a dedicated member and does not increase the size of the apparatus. Can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment of the present invention and showing a mechanical system of a conversion lens and a peripheral portion thereof.

FIG. 2 is a side view of the camera according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of a main part of the camera in FIG. 2 in a see-through manner.

FIG. 4 is a diagram showing the concept of blur correction in the present invention.

FIG. 5 is a diagram schematically showing a movement amount of a lens.

FIG. 6 is a diagram illustrating a change in a focal length of a lens.

FIG. 7 is a perspective view for explaining the movement of the conversion lens.

FIG. 8 is a block diagram illustrating a configuration of a control system of the camera according to the first embodiment.

FIG. 9 is a perspective view showing a conversion lens according to a second embodiment of the camera according to the second embodiment and a mechanical system around the conversion lens.

FIG. 10 is a diagram for explaining shake correction around the X axis in the second embodiment, and is a diagram showing a normal state in which a conversion lens is inserted on an optical path.

[Explanation of symbols]

 Reference Signs List 1 camera body, 2 group frame, 3 lens barrel, 4 conversion lens frame, 5 quick return mirror, 6 screen, 7 pentaprism, 8 finder eyepiece optical system, 9 focal plane shutter, 10 film, 11 axes, 12 retractable Strobe, 13 strobe light emitting section, 15 main lens, 16 first group lens, 17 second group lens, 18 conversion lens, 19, 20 correction drive section, 21, 22 blur detection section, 25, 31 shaft, 26 lens rotating member , 27, 28, 33, 34 drive transmission gear, 29 correction motor, 32 support arm, 36 conversion lens insertion / removal drive unit.

Claims (3)

[Claims] 1. A conversion lens movably provided between an insertion position inserted into an optical system and a retracted position retracted outside the optical system, and a focal length is obtained by inserting / retracting the conversion lens. Wherein the conversion lens is in the insertion position state,
A camera with an image stabilizing function, comprising: a converter driving unit that drives the conversion lens during shooting exposure to correct blurring of a shot image during shooting. 2. The camera with an anti-vibration function according to claim 1, wherein the converter driving means drives the conversion lens about an axis orthogonal to an optical axis of the photographing lens. 3. A conversion lens movably provided between an insertion position inserted into the optical system and a retracted position retracted outside the optical system, and a focal length is obtained by inserting / retracting the conversion lens. In a camera having a photographing optical system in which is changed, a driving unit for driving the conversion lens into / withdrawing by a driving source, and when the conversion lens is in the inserted state,
A camera with a vibration reduction function, comprising: a blur correction driving unit that drives the conversion lens by the driving source to correct a blur of a captured image during shooting.