JP7210362B2 - Lens device and imaging device - Google Patents

Description

The present invention relates to a lens apparatus having a lens position adjustment mechanism such as an automatic focus adjustment mechanism and a camera shake correction mechanism for reducing camera shake during shooting.

In recent years, lens barrels (lens devices) used in imaging devices such as digital cameras and video cameras generally have an automatic focus adjustment mechanism and an image stabilization mechanism. Patent Documents 1 and 2 disclose a lens device having an automatic focus adjustment mechanism and a camera shake correction mechanism.

JP-A-8-94899 JP 2011-33684 A

However, in the lens device disclosed in Patent Document 1, the camera shake correction mechanism is arranged in front of the lens group movable in the optical axis direction on the subject side, which increases the total length of the lens device. Further, in the lens device disclosed in Patent Document 2, the lens driving motor is arranged on the outer periphery of the lens group movable in the optical axis direction, which increases the outer diameter of the lens device.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a compact lens device and imaging device.

A lens device as one aspect of the present invention includes a first holding member that holds a first lens movably in an optical axis direction, and a second lens that holds a second lens movably in a direction different from the optical axis direction. a second holding member, a mount for connecting to the camera body, a rectilinear barrel supporting the first holding member so as to be movable in the optical axis direction, and arranged at a position closer to the mount than the rectilinear barrel. a holding lens barrel containing the second holding member ; a rotating barrel rotatably held on the outer periphery of the rectilinear barrel for driving the first holding member in the direction of the optical axis; and a first motor connected to the gear mechanism, wherein at least part of the first motor is closer to the mount than the holding barrel in the optical axis direction The gear mechanism is arranged at a position closer to the optical axis than the outer circumference of the holding barrel .
A lens device as another aspect of the present invention includes a first holding member that holds a first lens movably in an optical axis direction, and a second lens that holds a second lens movably in a direction different from the optical axis direction. a second holding member for connecting to the camera body; a rectilinear barrel that supports the first holding member movably in the optical axis direction; and a position closer to the mount than the rectilinear barrel. a holding lens barrel disposed and containing the second holding member; a rotating barrel rotatably held on the outer periphery of the rectilinear barrel for driving the first holding member in the direction of the optical axis; and a first motor connected to the gear mechanism, wherein at least part of the first motor is closer to the mount than to the holding lens barrel in the optical axis direction. The first motor is arranged at a position closer to the optical axis than the outer circumference of the holding barrel.

An imaging device as another aspect of the present invention includes a camera body having an imaging element and the lens device.
An imaging device as another aspect of the present invention includes a first holding member that holds a first lens movably in an optical axis direction, and a second lens that holds a second lens movably in a direction different from the optical axis direction. a rectilinear barrel that supports the first holding member so as to be movable in the optical axis direction; an imaging device; a holding lens barrel containing two holding members, a rotating barrel rotatably held on the outer periphery of the rectilinear barrel and driving the first holding member in the direction of the optical axis, and a gear for rotationally driving the rotating barrel. and a first motor connected to the gear mechanism, wherein at least part of the first motor is arranged at a position closer to the imaging device than the holding lens barrel in the optical axis direction. The gear mechanism is arranged at a position closer to the optical axis than the outer periphery of the holding barrel.
An imaging device as another aspect of the present invention includes a first holding member that holds a first lens movably in an optical axis direction, and a second lens that holds a second lens movably in a direction different from the optical axis direction. a rectilinear barrel that supports the first holding member so as to be movable in the optical axis direction; an imaging device; a holding lens barrel containing two holding members, a rotating barrel rotatably held on the outer periphery of the rectilinear barrel and driving the first holding member in the direction of the optical axis, and a gear for rotationally driving the rotating barrel. and a first motor connected to the gear mechanism, wherein at least part of the first motor is arranged at a position closer to the imaging device than the holding lens barrel in the optical axis direction. The first motor is arranged at a position closer to the optical axis than the outer periphery of the holding barrel.

Other objects and features of the invention are described in the following embodiments.

According to the present invention, it is possible to provide a compact lens device and imaging device.

FIG. 3 is a cross-sectional view of the lens barrel in the infinite photographing position in the present embodiment; FIG. 2 is a cross-sectional view of the lens barrel in the embodiment in a close-up photographing position; FIG. 4 is a diagram of the holding structure of the gearbox of the lens barrel in this embodiment. 3 is an enlarged view of an output gear and its surroundings of the lens barrel in this embodiment; FIG. 4 is a diagram showing the positional relationship between the gearbox of the lens barrel and the camera shake correction mechanism in this embodiment. FIG. FIG. 4 is a rear perspective view of the periphery of the gearbox of the lens barrel in this embodiment. FIG. 4 is a rear perspective view of the periphery of the first lens holding frame of the lens barrel according to the present embodiment; 1 is a configuration diagram of an imaging device according to this embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of a lens barrel (lens device) 100 according to the present embodiment will be described with reference to FIGS. 1 to 7. FIG. FIG. 1 is a cross-sectional view of the lens barrel 100 at the infinite photographing position. FIG. 2 is a cross-sectional view of the lens barrel 100 at a close-up position. FIG. 3 is a diagram of a holding structure of the gearbox of the lens barrel 100. As shown in FIG. FIG. 4 is an enlarged view of the output gear 141 of the lens barrel 100 and its periphery. FIG. 5 is a diagram showing the positional relationship between the gearbox of the lens barrel 100 and the image stabilization mechanism. FIG. 6 is a rear perspective view of the periphery of the gear box of the lens barrel 100. FIG. 7 is a rear perspective view of the periphery of the first lens holding frame 1 of the lens barrel 100. FIG.

The lens barrel 100 of this embodiment is detachably attached to the camera body 200, and the lens barrel 100 and the camera body 200 constitute an imaging device (camera system) 300 (see FIG. 8).

The mount 8 is provided to attach the lens barrel 100 to the camera body 200, and is fixed to the fourth lens holding frame 4 described later with screws (not shown). A back cover 9 is fixed to the mount 8 by the elastic force of integrally formed claws. The outer ring 10 is fixed to the fourth lens holding frame 4 with screws (not shown). A focus operation ring 12 for manual focus is rotatably arranged at the front end of the exterior ring 10 . A second lens holding frame (holding barrel) 2, which will be described later, is fixed with screws (not shown) in front of the fourth lens holding frame 4 on the object side. A guide tube (straight-moving tube) 60 is fixed to the second lens holding frame 2 with screws (not shown) in front of the second lens holding frame 2 on the object side.

The cam ring (rotary cylinder) 7 is rotatably arranged at a fixed position in the direction along the optical axis OA (optical axis direction) on the outer peripheral surface side of the guide cylinder 60 . The inner peripheral surface of the cam ring 7 is formed with three cam grooves 7a. A fixed cylinder 70 fixed to the second lens holding frame 2 with screws (not shown) is fixed to the front of the second lens holding frame 2 and to the outer circumference of the cam ring 7 . A projecting portion 70a to which an accessory hood (not shown) can be attached is formed at the front end portion of the fixed barrel 70 on the subject side.

The lens barrel 100 includes, in order from the object side to the image side, a first lens group (first lens) L1, a second lens group L2, a third lens group (second lens) L3, a fourth lens group L4, and a fifth lens group L5. The first lens group L1 consists of a 1a lens group L11, a 1b lens group L12, and a 1c lens group L13 in order from the object side to the image side. The fourth lens group L4 consists of a 4a lens group L41 and a 4b lens group L42 in order from the object side to the image side. The first lens group L1 is a focus adjustment lens (focus lens). The third lens group L3 is a camera shake correction lens (correction lens).

A first lens holding frame (first holding member) 1 holds the first lens group L1. The 1c lens holding frame 1c holds the 1c lens group L13. The second lens holding frame 2 holds the second lens group L2. A third lens holding frame (second holding member) 3 holds the third lens group L3. The fourth lens holding frame 4 holds the fourth lens group L4. The fifth lens holding frame 5 holds the fifth lens group L5. The diaphragm device 30 is fixed by being sandwiched between the first lens holding frame 1 and the 1c lens holding frame 1c. The diaphragm device 30 includes a motor (not shown) as a driving source, and controls the driving of the motor to change the opening area of the diaphragm blades contained therein to adjust the light amount.

The first lens holding frame 1 is supported by the guide tube 60 so as to be movable in the optical axis direction. The 1c lens holding frame 1c is positionally regulated by the first lens holding frame 1 in the optical axis direction, and is held with respect to the first lens holding frame 1 so as to be movable in the direction perpendicular to the optical axis OA. Between the second lens holding frame 2 and the fourth lens holding frame 4 are a third lens holding frame 3 and a third lens holding frame 3 which holds the third lens holding frame 3 so as to be drivable within a plane perpendicular to the optical axis OA. A lens base plate 35 is arranged. The third lens base plate 35 is held within the second lens holding frame 2 so as to be tiltable or eccentrically adjustable with respect to the second lens holding frame 2 .

The third lens holding frame 3 holds a coil 50 and the third lens base plate 35 holds a magnet 51 . The coil 50 and the magnet 51 constitute a motor (second motor) that drives the third lens holding frame 3 . A magnetic field is generated in the coil 50 by applying a current to the coil 50, and the third lens holding frame 3 moves with respect to the third lens base plate 35 in the direction perpendicular to the optical axis OA due to the attractive force or repulsive force with the magnet 51. .

The fifth lens holding frame 5 is fixed to the fourth lens holding frame 4 with screws (not shown). The first lens group L1, the second lens group L2, the third lens group L3, the fourth lens group L4, the fifth lens group L5, and the diaphragm device 30 constitute an imaging optical system. A filter frame 40 to which a filter (not shown) can be attached is arranged in front of the first lens group L1 on the subject side. The first lens group L1 and the diaphragm device 30 form a main element of a moving lens group that can move integrally in the optical axis direction.

Cam followers 16 are coupled to the outer peripheral portion of the first lens holding frame 1 at three points in the circumferential direction with screws (not shown). The three cam followers 16 have cylindrical portions, and the respective cylindrical portions are engaged with three cam grooves 7a formed in the cam ring 7. As shown in FIG. The three cam followers 16 are engaged with three rectilinear grooves (not shown) formed in the guide tube 60 to guide rectilinear movement of the first lens holding frame 1 in the optical axis direction. When the cam ring 7 rotates around the optical axis, the cam follower 16 moves in the optical axis direction due to the cam lift of the cam groove 7a. Therefore, the first lens holding frame 1 is guided by the rectilinear groove and moves rectilinearly in the optical axis direction. That is, the movable lens group (the first lens group L1 and the diaphragm device 30) moves in the optical axis direction. By moving the moving lens group in the optical axis direction according to the object distance, focus operation is performed between the infinity end and the closest end.

The motor unit 14 has a motor (first motor) 140 and a gearbox, and is fixed to the fourth lens holding frame 4 with screws. At least part of the motor 140 is arranged at a position closer to the mount 8 than the second lens holding frame 2 is. The motor unit 14 is arranged at a position substantially opposite to the coil 50 and the magnet 51 (second motor) with respect to the optical axis OA. The motor unit 14 is arranged at a position closer to the optical axis OA than the outer circumference of the second lens holding frame 2 . This makes it possible to provide an automatic focus adjustment mechanism and a camera shake correction mechanism without enlarging the lens barrel 100 .

An output gear (gear mechanism) 141 of the motor unit 14 meshes with a gear ring 700 provided on the outer periphery of the cam ring 7 . As the motor 140 rotates, the cam ring 7 rotates, and the movable lens group including the first lens group L1 and the diaphragm device 30 moves in the optical axis direction. When a load is applied from the output gear 141 to the gear ring 700, the cam ring 7 is urged toward the guide cylinder 60, enabling stable focusing operation. The output gear 141 is provided with a front bearing portion 142 on the subject side front and a rear bearing portion 143 on the mount side rear. In the present embodiment, the front bearing portion 142 and the rear bearing portion 143 are metal shafts, but are not limited to this. The front bearing portion 142 and the rear bearing portion 143 may each be a shaft integrally formed with the output gear 141 . A bearing 142 on the object side front of the output gear 141 is fitted with a bearing holding portion 2 g provided in the second lens holding frame 2 . A bearing 143 behind the mount side of the output gear 141 is fitted with a bearing holding portion 4g provided in the fourth lens holding frame 4 . With such a configuration, the third lens holding frame 3 and the third lens base plate 35, which are camera shake correction mechanisms, are not affected.

Further, by providing the bearing portion 2g in the second lens holding frame 2 fixed to the guide tube 60 holding the cam ring 7, the output gear 141 and the gear ring 700 can be meshed with high positional accuracy. This enables a highly accurate focusing operation.

A projection 2f provided near the bearing holding portion 2g is fitted with a projection 70f provided on the fixed cylinder 70. As shown in FIG. The protrusion 70f is arranged at a position farther from the optical axis OA than the protrusion 2f. As a result, even if a large load is applied to the meshing portion between the output gear 141 and the gear ring 700, the meshing portion will not come off.

The moving lens group (first lens group L1) has a rib portion (not shown) provided on the first lens holding frame 1 . A photointerrupter (not shown) is fixed to the guide tube 60 via a holding member (not shown). A rectangular wave signal is output by the rib portion passing between the light emitting portion and the light receiving portion of the photointerrupter. This makes it possible to detect the position of the moving lens group (first lens group L1).

Thus, in this embodiment, the lens device (lens barrel 100) has a first holding member (first lens holding frame 1) and a second holding member (third lens holding frame 3). The first holding member holds the first lens (first lens group L1) movably in the optical axis direction. The second holding member holds the second lens (third lens group L3) movably in a direction different from the optical axis direction. Also, the lens device is arranged at a position closer to the mount than the mount 8 for connecting to the camera body, a rectilinear barrel (guide barrel 60) that supports the first holding member so as to be movable in the optical axis direction, and the rectilinear barrel. and has a holding barrel (second lens holding frame 2) that includes a second lens holding frame. The lens device includes a rotating barrel (cam ring 7) that is rotatably held on the outer periphery of the rectilinear barrel and drives the first holding member in the optical axis direction, a gear mechanism (output gear 141) that rotationally drives the rotating barrel, and a first motor (motor 140) connected to the gear mechanism. At least part of the first motor is located closer to the mount than the holding barrel.

Preferably, the second holding member holds the second lens movably in a direction orthogonal to the optical axis direction. Also preferably, the first lens is a focus lens, and the second lens is a camera shake correction lens. Also preferably, the lens device has a third lens (second lens group L2) disposed between the first lens and the second lens, and the holding barrel holds the third lens. It is a third holding member. Further, preferably, the gear mechanism is arranged at a position closer to the optical axis than the outer periphery of the holding barrel. Further, preferably, the first motor is arranged at a position closer to the optical axis than the outer periphery of the holding barrel. Also preferably, the lens device has a second motor (coil 50, magnet 51) that drives the second holding member in a direction different from the optical axis direction, and the gear mechanism is arranged to drive the second holding member with respect to the optical axis. is located on the opposite side (substantially opposite side) of the motor. Also preferably, the first motor is arranged on the opposite side (substantially opposite side) of the second motor with respect to the optical axis. Further, preferably, at least part of the first motor is arranged at a position closer to the optical axis than the outer circumference of the first holding member. Also preferably, the lens device has a fixed barrel 70 arranged on the outer periphery of the rotating barrel.

Next, referring to FIG. 8, the imaging apparatus in each embodiment will be described. FIG. 8 is a configuration diagram of an imaging device (single-lens reflex camera) 300. As shown in FIG. In FIG. 8, a lens barrel (interchangeable lens) 100 has an imaging optical system (lens unit) 101 . A camera body (imaging device body) 200 includes a quick return mirror 203, a focusing screen 204, a penta roof prism 205, an eyepiece lens 206, and the like. The quick return mirror 203 reflects upward the light beam formed via the imaging optical system 101 . A focusing screen 204 is arranged at an image forming position of the imaging optical system 101 . A penta roof prism 205 converts the reverse image formed on the focusing screen 204 into an erect image. The user can observe the erected image through the eyepiece 206 .

The imaging device 207 includes a CCD sensor or a CMOS sensor, photoelectrically converts an optical image (object image) formed via the imaging optical system 101, and outputs image data. At the time of photographing, the quick return mirror 203 is retracted from the optical path, and an optical image is formed on the image sensor 207 via the imaging optical system 101 . The control section 210 has a CPU and controls the operation of each section of the camera body 200 .

The imaging device 300 includes a camera body 200 having an imaging element 207 and a lens barrel 100 detachably attached to the camera body 200, but is not limited to this. It may be an imaging device in which a camera body and a lens barrel are integrally configured, or a mirrorless single-lens reflex camera (mirrorless camera) without a quick return mirror.

The lens apparatus of this embodiment can be provided with an automatic focus adjustment mechanism and a camera shake correction mechanism without increasing the size of the lens barrel. Therefore, according to this embodiment, it is possible to provide a compact lens device and imaging device.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist.

1 first lens holding frame (first holding member)
2 Second lens holding frame (second holding member)
7 Cam ring (rotating cylinder)
8 Mount 60 Guide cylinder (straight cylinder)
140 motor (first motor)
141 output gear (gear mechanism)

Claims (19)

a first holding member that holds the first lens movably in the optical axis direction;
a second holding member that holds the second lens movably in a direction different from the optical axis direction;
A mount for connecting to the camera body,
a rectilinear barrel that supports the first holding member so as to be movable in the optical axis direction;
a holding lens barrel disposed at a position closer to the mount than the rectilinear barrel and containing the second holding member ;
a rotating barrel that is rotatably held on the outer periphery of the rectilinear barrel and that drives the first holding member in the optical axis direction;
a gear mechanism that rotationally drives the rotating cylinder;
a first motor connected to the gear mechanism;
at least part of the first motor is arranged at a position closer to the mount than the holding barrel in the optical axis direction ;
The lens device , wherein the gear mechanism is arranged at a position closer to the optical axis than the outer periphery of the holding barrel . a first holding member that holds the first lens movably in the optical axis direction;
a second holding member that holds the second lens movably in a direction different from the optical axis direction;
A mount for connecting to the camera body,
a rectilinear barrel that supports the first holding member so as to be movable in the optical axis direction;
a holding lens barrel disposed at a position closer to the mount than the rectilinear barrel and containing the second holding member;
a rotating barrel that is rotatably held on the outer periphery of the rectilinear barrel and that drives the first holding member in the optical axis direction;
a gear mechanism that rotationally drives the rotary cylinder;
a first motor connected to the gear mechanism;
at least part of the first motor is arranged at a position closer to the mount than the holding barrel in the optical axis direction;
The lens device according to claim 1, wherein the first motor is arranged at a position closer to the optical axis than the outer periphery of the holding barrel. 3. The lens device according to claim 1, wherein said second holding member holds said second lens movably in a direction orthogonal to said optical axis direction. The first lens is a focus lens,
4. The lens device according to claim 1, wherein the second lens is a camera shake correcting lens. further comprising a third lens positioned between the first lens and the second lens;
5. The lens device according to claim 1 , wherein the holding barrel is a third holding member that holds the third lens. further comprising a second motor for driving the second holding member in a direction different from the optical axis direction;
6. The lens device according to any one of claims 1 to 5 , wherein the gear mechanism is arranged on the opposite side of the second motor with respect to the optical axis. further comprising a second motor for driving the second holding member in a direction different from the optical axis direction;
7. The lens device according to any one of claims 1 to 6 , wherein the first motor is arranged on the opposite side of the second motor with respect to the optical axis. 8. The apparatus according to any one of claims 1 to 7 , wherein at least part of said first motor is arranged at a position closer to said optical axis than an outer circumference of said first holding member. lens device. 9. The lens device according to any one of claims 1 to 8 , further comprising a fixed barrel disposed on the outer periphery of said rotating barrel. a camera body having an imaging element;
An imaging apparatus comprising: the lens apparatus according to any one of claims 1 to 9 . a first holding member that holds the first lens movably in the optical axis direction;
a second holding member that holds the second lens movably in a direction different from the optical axis direction;
a rectilinear barrel that supports the first holding member so as to be movable in the optical axis direction;
an imaging device;
a holding lens barrel disposed at a position closer to the imaging device than the rectilinear barrel and including the second holding member;
a rotating barrel that is rotatably held on the outer periphery of the rectilinear barrel and that drives the first holding member in the optical axis direction;
a gear mechanism that rotationally drives the rotary cylinder;
a first motor connected to the gear mechanism;
at least a part of the first motor is arranged at a position closer to the imaging device than the holding lens barrel in the optical axis direction;
The image pickup apparatus, wherein the gear mechanism is arranged at a position closer to the optical axis than the outer circumference of the holding barrel. a first holding member that holds the first lens movably in the optical axis direction;
a second holding member that holds the second lens movably in a direction different from the optical axis direction;
a rectilinear barrel that supports the first holding member so as to be movable in the optical axis direction;
an imaging device;
a holding lens barrel disposed at a position closer to the imaging device than the rectilinear barrel and including the second holding member;
a rotating barrel that is rotatably held on the outer periphery of the rectilinear barrel and that drives the first holding member in the optical axis direction;
a gear mechanism that rotationally drives the rotary cylinder;
a first motor connected to the gear mechanism;
at least a part of the first motor is arranged at a position closer to the imaging device than the holding lens barrel in the optical axis direction;
The imaging apparatus according to claim 1, wherein the first motor is arranged at a position closer to the optical axis than the outer periphery of the holding lens barrel. 13. The imaging apparatus according to claim 11, wherein said second holding member holds said second lens movably in a direction orthogonal to said optical axis direction. The first lens is a focus lens,
14. The imaging apparatus according to any one of claims 11 to 13, wherein the second lens is a camera shake correction lens. further comprising a third lens positioned between the first lens and the second lens;
15. The imaging apparatus according to any one of claims 11 to 14, wherein the holding barrel is a third holding member that holds the third lens. further comprising a second motor for driving the second holding member in a direction different from the optical axis direction;
16. The imaging apparatus according to any one of claims 11 to 15, wherein the gear mechanism is arranged on the opposite side of the second motor with respect to the optical axis. further comprising a second motor for driving the second holding member in a direction different from the optical axis direction;
17. The imaging apparatus according to any one of claims 11 to 16, wherein the first motor is arranged on the opposite side of the second motor with respect to the optical axis. 18. The apparatus according to any one of claims 11 to 17, wherein at least part of said first motor is arranged at a position closer to said optical axis than an outer circumference of said first holding member. Imaging device. 19. The imaging apparatus according to any one of claims 11 to 18, further comprising a fixed barrel arranged on the outer circumference of said rotating barrel.

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