WO2009093474A1 - レンズ鏡筒 - Google Patents
レンズ鏡筒 Download PDFInfo
- Publication number
- WO2009093474A1 WO2009093474A1 PCT/JP2009/000273 JP2009000273W WO2009093474A1 WO 2009093474 A1 WO2009093474 A1 WO 2009093474A1 JP 2009000273 W JP2009000273 W JP 2009000273W WO 2009093474 A1 WO2009093474 A1 WO 2009093474A1
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- WIPO (PCT)
- Prior art keywords
- cam follower
- cam
- drive frame
- fixed frame
- frame
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
Definitions
- the present invention relates to a lens barrel that can be mounted on an optical device such as a digital still camera, a digital video camera, or a camera-equipped mobile phone.
- An imaging device such as a digital still camera has a lens barrel.
- Some lens barrels contain various lenses such as a zoom lens and can move forward and backward in the optical axis direction with respect to the camera body.
- Such a lens barrel may be referred to as a “collapsed lens barrel”.
- Patent Document 1 discloses a retractable lens barrel.
- the retractable lens barrel disclosed in Patent Document 1 includes a holding frame that holds a lens and a cam ring that incorporates the holding frame.
- the holding frame can be extended with respect to the cam ring by a cam action.
- the thickness of the lens holding frame constituting the lens barrel affects the thickness of the digital still camera. This is because in the retracted state, the lens holding frame is housed in the housing of the digital still camera. Therefore, in order to reduce the thickness of the digital still camera, it is required to reduce the thickness of the lens holding frame.
- the retractable lens barrel high magnification is required. In order to satisfy this requirement, it is necessary to provide a sufficient distance between the lens and the image sensor. Therefore, the lens barrel cannot be made sufficiently thin.
- the lens barrel of the present invention is a lens barrel that holds a lens for photographing, a fixed frame having a cam groove formed on the inner peripheral surface, a cam follower provided on the outer peripheral surface, and an outer peripheral surface.
- a drive frame having a plurality of meshing teeth provided on substantially the same circumference as the cam follower, and the cam follower is incorporated in the fixed frame, and the cam follower is mounted on the cam follower.
- the retaining wall cannot be provided within the range for directly receiving the cam follower to be dropped off, or when the retaining wall provided within the range for directly receiving the cam follower is not sufficient.
- FIG. 1 is a perspective view illustrating an appearance of the imaging apparatus according to Embodiment 1.
- FIG. FIG. 2 is an exploded perspective view of the imaging apparatus.
- FIG. 3 is a side view of the drive frame.
- FIG. 4A is a top view of the vicinity of the cam follower in the drive frame.
- FIG. 4B is a side view of the cam follower.
- FIG. 4C is a top view of the cam follower.
- FIG. 5 is a schematic diagram showing the configuration of the inner surface of the fixed frame.
- FIG. 6 is a schematic diagram illustrating the configuration of the inner surface of the fixed frame.
- FIG. 7 is a cross-sectional view taken along the line ZZ in FIG.
- FIG. 8 is a side view showing a state in which the drive frame is incorporated in the fixed frame.
- FIG. 9 is a side view showing a state in which the drive frame and the rectilinear frame are incorporated in the fixed frame.
- FIG. 10 is a perspective view of the fixed frame and the drive frame according to the second embodiment.
- FIG. 11 is an exploded view of the inner peripheral surface of the fixed frame.
- FIG. 12A is a perspective view of the front surface of the drive frame as viewed obliquely from above.
- FIG. 12B is an enlarged view of the vicinity of the meshing tooth in FIG. 12A.
- FIG. 13 is a top view of the drive frame.
- FIG. 14 is a side view of the drive frame.
- FIG. 15 is a development view showing an inner surface configuration of the fixed frame in which the drive frame is incorporated.
- FIG. 16 is a development view showing an inner surface configuration of a fixed frame in which a drive frame is incorporated.
- FIG. 17 is a development view showing an inner surface configuration of a fixed frame in which a drive frame is incorporated.
- FIG. 18 is a development view showing an inner surface configuration of a fixed frame in which a drive frame is incorporated.
- FIG. 19 is a top view of the fixed frame in which the drive frame is incorporated.
- 20A is a cross-sectional view taken along the line V1-V1 in FIG. 20B is a cross-sectional view taken along the line V2-V2 in FIG.
- FIG. 21 is a development view showing another configuration example of the fixed frame and the drive frame.
- FIG. 22 is a plan view showing another configuration example of the cam follower.
- FIG. 23 is a schematic diagram illustrating the configuration of the inner surface of the fixed frame.
- the lens barrel of the present invention is a lens barrel that holds a lens for photographing, a fixed frame having a cam groove formed on the inner peripheral surface, a cam follower provided on the outer peripheral surface, and an outer peripheral surface.
- a drive frame having a plurality of meshing teeth provided on substantially the same circumference as the cam follower, and the cam follower is incorporated in the fixed frame, and the cam follower is mounted on the cam follower.
- the fixed frame includes a first protrusion provided along the cam groove, and the first protrusion has a predetermined positional relationship between the drive frame and the fixed frame.
- the cam follower and the plurality of meshing teeth Among is arranged between the nearest meshing teeth on the cam follower.
- the lens barrel of the present invention can take the following aspects based on the above configuration.
- the meshing tooth closest to the cam follower may have a notch so as not to interfere with the first protrusion.
- the drive frame has a plurality of meshing teeth having the notch portions, and the plurality of meshing teeth having the notch portions are continuously arranged. It can. With such a configuration, even when the cam groove has a complicated shape, the protrusion and the plurality of meshing teeth do not contact when the cam follower moves through the cam groove. Therefore, the protrusion does not hinder the movement of the drive frame.
- the teeth at one end or both ends are notched differently compared to the other teeth having the notch. It can be set as the structure which has a part. With such a configuration, when the cam follower moves in the cam groove, the protrusion and the tooth do not come into contact with each other, so that the protrusion does not hinder the movement of the drive frame.
- the fixed frame has a predetermined number of cam grooves
- the drive frame is fitted in the predetermined number of cam grooves in a state of being incorporated in the fixed frame. It can be set as the structure which has a predetermined number of cam followers.
- the first protrusion may be provided along at least one of the cam grooves.
- the fixed frame abuts against an end of the drive frame, and the cam follower can be prevented from coming off the cam groove.
- Two protrusions may be further provided.
- the drive frame further has a raised portion in the vicinity of the end face of the drive frame, and the end of the drive frame is a part or all of the raised portion, On the other hand, when an external force is applied, the raised portion abuts on the second protrusion, thereby preventing the cam follower from coming off the cam groove.
- the end and the cam follower closest to the end are separated by a predetermined length, and no external force is applied to the drive frame.
- the cam follower can move in the cam groove so that the drive frame does not engage with the first protrusion.
- the cam groove includes a parallel portion that is substantially parallel to a circumferential direction of the fixed frame, and an inclined portion that is inclined with respect to the circumferential direction of the fixed frame, and the lens is a zoom lens.
- the cam follower may be configured to move between the wide-angle end and the telephoto end as the cam follower moves along the inclined portion of the cam groove.
- FIG. 1 shows an example of an apparatus provided with the lens barrel of the present embodiment.
- the apparatus shown in FIG. 1 is an imaging apparatus mounted on a digital camera.
- the imaging apparatus 1 includes various lenses such as a zoom lens and a focus lens, and an imaging element that converts incident light into an electrical signal and outputs it.
- the imaging device described in this embodiment is an example, and can be mounted not only on a digital camera but also on a video camera or the like.
- the fixed frame 10, the drive frame 20, and the first group unit 40 are arranged at coaxial positions.
- a gear 11 is disposed in the vicinity of the fixed frame 10.
- the gear 11 is rotationally driven by driving means such as a motor.
- the drive frame 20 and the first group unit 40 move in the direction indicated by the arrow B by rotating the gear 11 in the direction indicated by the arrow C.
- the drive frame 20 and the first group unit 40 move in the direction indicated by the arrow A by rotating the gear 11 in the direction indicated by the arrow D.
- the state of the imaging apparatus 1 shown in FIG. 1 shows a state in which the drive frame 20 and the first group unit 40 are accommodated in the fixed frame 10 (hereinafter referred to as a retracted state), and is driven by rotating the gear 11.
- the frame 20 and the first group unit 40 can be extended in the direction indicated by the arrow A.
- a plate-like lens barrier 41 is disposed on the end surface of the first group unit 40.
- the lens barrier 41 can open or close the opening 42 of the first
- FIG. 2 is an exploded perspective view of each unit included in the imaging apparatus 1.
- the imaging device 1 includes a fixed frame 10, a drive frame 20, a rectilinear frame 30, a first group unit 40, a second group unit 50, and a base body 60.
- the outer peripheral surface of the cylindrical portion of the substantially cylindrical member such as the fixed frame 10, the drive frame 20, and the rectilinear frame 30 is referred to as an “outer surface”, and the inner peripheral surface of the cylindrical portion is referred to as an “inner surface”. Called.
- the fixed frame 10 has a cam groove 12 formed on the inner surface.
- the fixed frame 10 is fixed to the chassis (not shown) of the imaging device 1 together with the base body 60.
- a plurality of cam grooves 12 are preferably provided, and in this embodiment, three cam grooves 12 are provided.
- the fixed frame 10 is formed with a rectilinear groove 13 substantially parallel to the optical axis direction on the inner surface.
- the drive frame 20 is arranged inside the fixed frame 10.
- the drive frame 20 is arranged to be rotatable in the circumferential direction and movable in the optical axis direction.
- the drive frame 20 is movable between a position accommodated in the fixed frame 10 and a position where a part of the drive frame 20 protrudes from the fixed frame 10 in the optical axis direction.
- the drive frame 20 includes a cam follower 22 on the outer surface.
- a plurality of cam followers 22 are preferably provided, and in this embodiment, three cam followers 22 that are the same as the number of cam grooves 12 are provided.
- the cam follower 22 is loosely fitted in the cam groove 12 formed in the fixed frame 10 so as to be freely movable.
- the drive frame 20 has a plurality of cam grooves 23 formed on the inner surface.
- the drive frame 20 has a rack 21 formed on the outer surface in the circumferential direction (see FIG. 3).
- the rack 21 meshes with the gear 11 in a state where the drive frame 20 is assembled to the fixed frame 10. Accordingly, the drive frame 20 can be rotated in the direction indicated by the arrow E or F by rotating the gear 11 in the direction indicated by the arrow C or D.
- the rectilinear frame 30 is arranged inside the drive frame 20.
- the rectilinear frame 30 is arranged so as to be rotatable in the circumferential direction. Further, the rectilinear frame 30 is arranged so as to move integrally with the drive frame 20 when the drive frame 20 moves in the direction indicated by the arrow A or B (see FIG. 1).
- the rectilinear frame 30 has a plurality of long holes 31 formed in the cylindrical portion.
- the long hole 31 is formed substantially parallel to the optical axis direction of the rectilinear frame 30 and penetrates from the outer surface to the inner surface of the rectilinear frame 30.
- the rectilinear frame 30 has a rectilinear key 32 formed on the outer surface. The rectilinear key 32 is loosely fitted in the rectilinear groove 13 of the fixed frame 10 so as to be movable.
- the first group unit 40 is arranged inside the rectilinear frame 30. Further, the first group unit 40 includes an objective lens and the like. Further, the first group unit 40 includes a lens barrier 41 that can open and close the opening 42 on the end surface in the optical axis direction. The first group unit 40 includes a plurality of cam followers 43 on the outer surface. The cam follower 43 is loosely fitted in a cam groove 23 formed in the drive frame 20 through a long hole 31 formed in the rectilinear frame 30. Accordingly, when the drive frame 20 rotates in the direction indicated by the arrow E or F, the first group unit 40 moves in the optical axis direction.
- the second group unit 50 includes a shutter unit, a second group lens, and the like.
- the base body 60 is fixed to a chassis (not shown) of the imaging device 1.
- the base 60 is provided with a focus lens, an image sensor, and the like.
- the fixed frame 10 is an example of a first frame.
- the drive frame 20 is an example of a second frame.
- the direction indicated by the arrow A and the direction indicated by the arrow B are directions substantially parallel to the optical axis of the imaging device 1.
- the direction indicated by the arrow E and the direction indicated by the arrow F are circumferential directions around the optical axis of the imaging device 1.
- the retracted state shown in FIG. 1 is a state when the power of the digital camera including the imaging device 1 is off.
- the imaging device 1 includes the drive frame 20, the rectilinear frame 30, the first group unit 40, and the second group unit 50 housed in the fixed frame 10.
- the lens barrier 41 is closed.
- driving means such as a motor is energized to start driving.
- the gear 11 meshed directly or indirectly with the output shaft of the motor rotates in the direction indicated by the arrow C.
- the gear 11 rotates in the direction indicated by the arrow C
- the drive frame 20 rotates in the direction indicated by the arrow E because the gear 11 and the rack 21 are engaged with each other.
- the cam follower 22 moves in the cam groove 12, and the drive frame 20 moves in the direction indicated by the arrow A by the cam drive of the cam groove 12 and the cam follower 22.
- the drive frame 20 moves in the direction indicated by the arrow A while rotating in the direction indicated by the arrow E from the retracted state shown in FIG. Further, since the rectilinear key 32 is loosely fitted in the rectilinear groove 13, the rectilinear frame 30 moves in the direction indicated by the arrow A as the drive frame 20 moves in the direction indicated by the arrow A.
- the cam follower 43 moves inside the cam groove 23 and the first group unit 40 moves in the direction indicated by the arrow A.
- the rectilinear frame 30 moves integrally with the drive frame 20 in the direction indicated by the arrow A while the rotation in the circumferential direction is restricted by the rectilinear key 32 being loosely fitted in the rectilinear groove 13.
- the recognition of the operation state of various operation means such as a power switch and the control of each part in the digital camera are executed by a control means such as a control microcomputer.
- the drive frame 20, the rectilinear frame 30, and the first group unit 40 can be moved to a position protruding from the fixed frame 10 in the direction indicated by the arrow A.
- This state is a photographing standby state.
- the control means moves the zoom lens (not shown) in the optical axis direction to perform a zoom operation.
- the digital camera including the imaging device 1 can execute a focus operation, a shooting operation, and the like in addition to a zoom operation, but a description thereof will be omitted.
- FIG. 3 is a plan view of the drive frame 20 as viewed in the direction indicated by the arrow B in FIG. As shown in FIG. 3, three cam followers 22 are formed on the outer surface of the drive frame 20.
- FIG. 4A is a top view of the vicinity of the cam follower 22 in the drive frame 20.
- 4B is a cross-sectional view taken along the line ZZ in FIG. 4A.
- FIG. 4C shows an enlarged view of the cam follower 22.
- the cam follower 22 is formed in a cylindrical shape whose top surface and bottom surface are substantially elliptical. Specifically, as shown in FIG. 4C, the cam follower 22 is formed in a shape when two perfect circles 22a and 22b are virtually arranged.
- the width dimension D2 of the cam follower 22 is approximately twice the depth dimension D1.
- the relationship between the dimension D1 and the dimension D2 is an example, the dimension D2 may be 1.5 times the dimension D1, or the dimension D2 may be three times or more the dimension D1, and at least the dimension D2 is equal to the dimension D1. It may be n times (n is a value larger than 1; however, n is not limited to a natural number but also includes a decimal number).
- the dimension D2 is preferably approximately twice the dimension D1 as in the present embodiment.
- the cam follower 22 has an inclined portion 22c formed at the edge of the top surface.
- the inclination angle of the inclined portion 22 c is equal to the inclination angle of the side surface of the cam groove 12. Therefore, when the cam follower 22 is loosely fitted in the cam groove 12, the inclined surface 22 c can come into surface contact with the side surface of the cam groove 12.
- FIG. 5 is a diagram schematically showing a configuration in the vicinity of the cam groove 12 on the inner surface of the fixed frame 10.
- the cam groove 12 includes a first region 12a, a second region 12b, a third region 12c, a fourth region 12d, and a fifth region 12e.
- the first region 12a is located at one end of the cam groove 12 and is a region where the cam follower 22 is located when the drive frame 20 is in the retracted position. Further, the groove width G1 of the first region 12a has such a dimension that the end 22d (see FIG. 4C) in the short side direction of the cam follower 12 can contact. Further, the first region 12 a has a side surface (side surface formed in the direction of the cam groove 12) formed in a direction substantially parallel to the circumferential direction of the fixed frame 10.
- the second area 12b is formed so as to be connected to the first area 12a, and the cam follower 22 moves when the drive frame 20 moves between the retracted position and the protruding position. Further, the groove width G2 of the second region 12b has such a dimension that the end 22e (see FIG. 4C) in the long side direction of the cam follower 22 can contact. Further, the second region 12 b is formed in a direction in which the side surface is inclined with respect to the circumferential direction of the fixed frame 10.
- the third area 12c is formed so as to be connected to the second area 12b, and the cam follower 22 is located when the drive frame 20 is in the protruding position.
- the third region 12c has a groove width with which the end 22d in the short side direction of the cam follower 22 can abut, and is equal to the groove width G1 of the first region 12a. Further, the third region 12 c has a side surface formed in a direction substantially parallel to the circumferential direction of the fixed frame 10. When the cam follower 22 is located in the third region 12c, the zoom lens is located at the wide angle end.
- the fourth region 12d is formed in connection with the third region 12c, and is a region where the cam follower 22 moves when the zoom lens moves from the wide-angle end to the telephoto end.
- the fourth region 12d has a groove width with which the end 22e in the long side direction of the cam follower 22 can abut, and is equivalent to the groove width G2 of the second region 12b.
- the fourth region 12 d is formed in a direction in which the side surface is inclined with respect to the circumferential direction of the fixed frame 10.
- the fifth area 12e is formed so as to be connected to the fourth area 12d, and the cam follower 22 is located when the zoom lens is located at the telephoto end.
- the fifth region 12e has a groove width with which the end 22d in the short side direction of the cam follower 22 can abut, and is equivalent to the groove width G1 of the first region 12a. Further, the fifth region 12 e has a side surface formed in a direction substantially parallel to the circumferential direction of the fixed frame 10.
- the opening 12f is for inserting the cam follower 22 into the cam groove 12, and has an opening width dimension larger than at least the width dimension D2 of the cam follower 22 (see FIG. 4C).
- the curved portion 12g is formed on the side surface of the cam groove 12 between each region.
- region be a set of curved parts.
- the side surface of the cam groove 12 in each region is substantially flat, but each region is connected by a curved surface (curved portion 12g).
- the curved portions 12g are formed on the opposing side surfaces of the cam groove 12, respectively.
- the curved portion 12g is formed to have a groove width with which the inclined surface 22c of the cam follower 22 abuts whenever the cam follower 22 moves from region to region. That is, the cam groove 12 of the present embodiment is formed such that the groove widths of the adjacent curved regions 12g gradually widen or narrow toward the adjacent regions because the groove widths of the adjacent regions are different from each other. .
- FIG. 6 is a view for explaining the movement of the cam follower 22 with respect to the cam groove 12 and shows the configuration of the inner surface of the fixed frame 10. Hereinafter, the movement of the cam follower 22 will be described.
- the cam follower 22 is located in the first region 12a (for example, position 122a). At this time, the position of the cam follower 22 is regulated while the end 22d in the short side direction abuts against the side surface of the cam groove 12 and the backlash in the width direction of the cam groove 12 is suppressed.
- the cam follower 22 located in the first area 12a moves into the second area 12b (for example, Position 122b).
- the cam follower 22 is moving in the second region 12b, the end 22e in the long side direction always abuts against the side surface of the cam groove 12, and the occurrence of backlash in the width direction of the cam groove 12 is suppressed. Thereby, the drive frame 20 moves toward the protruding position.
- the cam follower 22 moves into the third region 12c (for example, position 122c).
- the cam follower 22 is located in the third region 12c, the end 22d in the short side direction always abuts against the side surface of the cam groove 12, and the position of the cam follower 22 is regulated while the backlash in the width direction of the cam groove 12 is suppressed. ing.
- the zoom lens is located at the wide-angle end.
- the cam follower 22 moves from the third region 12c to the fourth region 12d. Move (for example, position 122d).
- the cam follower 22 is positioned in the fourth region 12d, the end 22e in the long side direction always abuts against the side surface of the cam groove 12, and the backlash in the width direction of the cam groove 12 is suppressed. Even when the cam follower 22 moves in the fourth region 12d, the end 22e in the long side direction always abuts against the side surface of the cam groove 12.
- the inclined surface 22c of the cam follower 22 is always in contact with the side surface of the cam groove 12 regardless of the position of the zoom lens. Therefore, backlash between the cam follower 22 and the cam groove 12 can be suppressed regardless of the position of the zoom lens.
- the cam follower 22 moves into the fifth area 12e (position 122e).
- the cam follower 22 is positioned in the fifth region 12e, the end 22d in the short side direction always abuts against the side surface of the cam groove 12, and the position of the cam follower 22 is regulated while the backlash in the width direction of the cam groove 12 is suppressed. Yes.
- the cam follower 22 moves from the fifth area 12e or the fourth area 12d toward the third area 12c. Also at this time, the cam follower 22 always abuts against the side surface of the cam groove 12 and moves while suppressing backlash in the width direction of the cam groove 12.
- the drive frame 20 is rotationally driven by the motor and is in any one of the third region 12c, the fourth region 12d, and the fifth region 12e.
- the cam follower 22 moves to the first area 12a via the second area 12b.
- the cam follower 22 always abuts against the side surface of the cam groove 12 during movement toward the first region 12a, and moves while suppressing backlash.
- the side surface of the cam groove 12 between each region is formed with a curved surface (curved portion 12g), and the inclined surface 22c of the cam follower 22 always contacts the side surface of the cam groove 12 when the cam follower 22 moves from region to region. It is formed to touch.
- the cam groove 12 with the curved portion 12g, the impact generated when the cam follower 22 moves between the regions can be suppressed.
- the cam groove bent into a substantially " ⁇ " shape as disclosed in Patent Document 1 when the cam follower moves along the bent portion of the cam groove, the impact caused by the collision between the cam follower and the side surface of the cam groove. Will occur.
- the generated impact is transmitted to the user's hand holding the digital camera via the main body housing of the digital camera provided with the imaging device 1, which gives the user a sense of discomfort.
- the provision of the curved portion 12g suppresses the occurrence of an impact and prevents the user from feeling uncomfortable.
- the rectilinear groove 13 of the present embodiment is formed so as to overlap a part of the first region 12 a of the cam groove 12.
- An opening for inserting a straight key (described later) into the straight groove 13 is formed at the same position as the opening 12 f of the cam groove 12.
- FIG. 7 shows the rectilinear groove 13 and is a cross section taken along the line ZZ in FIG. As shown in FIG. 7, the rectilinear groove 13 is formed deeper than the depth d1 of the cam groove 12 (depth d2). Further, the width dimension w2 of the rectilinear groove 13 is smaller than the width dimension w1 of the opening 12f, and smaller than the width dimension D2 of the cam follower 22.
- the cam follower 22 Since the cam follower 22 has a width dimension D2 larger than the width dimension w2 of the rectilinear groove 13 and smaller than the width dimension w1 of the opening 12f, the cam follower 22 is erroneously inserted into the rectilinear groove 13 when inserted into the cam groove 12. And can be reliably inserted into the cam groove 12.
- the width dimension of the rectilinear key 32 formed in the rectilinear frame 30 is inserted into the rectilinear groove 13
- the width dimension of the rectilinear key 32 is formed to be smaller than the width dimension of the rectilinear groove 13, so that it is surely inserted. Can do.
- FIG. 8 is a view of the fixed frame 10 into which the drive frame 20 is inserted as viewed from the direction indicated by the arrow A (see FIG. 2).
- FIG. 9 is a view of the fixed frame 10 into which the drive frame 20 and the rectilinear frame 30 are inserted as seen from the direction indicated by the arrow A.
- FIG. 8 is a view of the fixed frame 10 into which the drive frame 20 is inserted as viewed from the direction indicated by the arrow A (see FIG. 2).
- FIG. 9 is a view of the fixed frame 10 into which the drive frame 20 and the rectilinear frame 30 are inserted as seen from the direction indicated by the arrow A.
- the rectilinear frame 30 moves in the optical axis direction integrally with the drive frame 20 as the drive frame 20 moves in the optical axis direction.
- positions 132a to 132e indicate the positions of the straight key 32 when the cam follower 22 is located at each of the positions 122a to 122e.
- the rectilinear key 32 moves in the rectilinear groove 13 while restricting movement of the rectilinear frame 30 in the rotation direction.
- the space for forming the cam groove 12 and the rectilinear groove 13 in the fixed frame 10 can be reduced. It can be downsized. In particular, since the space efficiency in the circumferential direction of the fixed frame 10 can be improved, the diameter of the fixed frame 10 can be reduced.
- the cam follower 22 can be increased in rigidity by increasing the outer diameter of the cam follower 22, and the cam follower 22 may be damaged when an external impact is applied to the imaging apparatus 1. Can be reduced.
- the outer diameter of the cam follower 22 is the outer diameter of the conventional substantially circular cam follower in the short side direction, and the outer diameter in the long side direction is n times that of the substantially perfect cam follower (this embodiment is substantially omitted). 2), the shape design of the cam follower 22 and the cam groove 12 is facilitated.
- the curved portion 12g between the regions in the cam groove 12 it is possible to suppress the occurrence of an impact on the cam follower 22 when the cam follower 22 moves between the regions. Therefore, since the impact is not transmitted to the main body housing of the digital camera provided with the imaging device 1, it is possible to prevent the impact from being transmitted to the user's hand holding the imaging device 1.
- the fixed frame 10 can be reduced in size.
- the space efficiency in the circumferential direction of the fixed frame 10 can be improved, the diameter of the fixed frame 10 can be reduced.
- the groove width w1 (see FIG. 6) of the rectilinear groove 13 is made smaller than the groove width w2 (see FIG. 6) of the cam follower insertion portion in the cam groove 12, so that the cam follower 22 is inserted into the cam groove 12. It is possible to prevent the cam follower 22 from being erroneously inserted into the rectilinear groove 13. Therefore, workability when the drive frame 20 is incorporated into the fixed frame 10 can be improved.
- the cam groove 12 has a different groove width for each region and has a shape in which the groove width between the regions is continuously changed, so that the cam follower 22 is cam groove. 12 can be moved smoothly.
- the rectilinear groove 13 is formed so as to overlap with the first region 12a of the cam groove 12, but the same effect can be obtained even if formed so as to overlap with the cam groove 12 in the fifth region 12e. can get.
- the imaging device according to the second embodiment includes a fixed frame, a drive frame, a rectilinear frame, a first group unit, a second group unit, and a base.
- FIG. 10 is a perspective view of the fixed frame 100 and the drive frame 200 in the imaging apparatus according to the second embodiment.
- the fixed frame 100 is formed in a substantially cylindrical shape, and cam grooves 103, 104, and 105 (only the cam groove 103 is shown in FIG. 10) are formed on the inner surface thereof. Since the shape of the cam grooves 103, 104, 105, the position on the fixed frame 100, and the like are the same as those of the cam groove 12 (see FIG. 6) according to the first embodiment, detailed description thereof is omitted.
- Protrusions 101 and 102 are formed in the vicinity of the cam groove 103. Detailed description of the protrusions 101 and 102 will be described later.
- the drive frame 200 is formed in a substantially cylindrical shape, and a plurality of meshing teeth 200a are formed on the outer surface thereof. Detailed description of the plurality of meshing teeth 200a will be described later.
- FIG. 11 is a developed view of the inner peripheral surface of the fixed frame 100.
- the fixed frame 100 has a cam groove 103, a cam groove 104, and a cam groove 105.
- the cam groove 103, the cam groove 104, and the cam groove 105 have the same shape.
- the cam groove 103 includes a horizontal portion 106, an inclined portion 107, a horizontal portion 108, an inclined portion 109, and a horizontal portion 110.
- the horizontal portions 106, 108 and 110 are substantially horizontal with respect to the circumferential direction of the outer peripheral cylindrical surface of the fixed frame 100.
- the inclined portions 107 and 109 are inclined with respect to the circumferential direction of the outer peripheral cylindrical surface of the fixed frame 100.
- the fixed frame 100 has a protrusion 101 and a protrusion 102 along the cam groove 103.
- the protrusion 101 and the protrusion 102 form a wall surface along the cam groove 103.
- the protrusion 101 is formed along the inclined portion 107.
- the protrusion 102 is formed along the inclined portion 109.
- the direction indicated by the arrow a in FIG. 11 is the direction on the digital camera body side when the lens barrel according to the present embodiment is attached to the digital camera body (not shown).
- the direction shown by the arrow b shown in FIG. 11 is the direction on the lens side when the lens barrel according to the present embodiment is attached to a digital camera body (not shown).
- the cam groove 103 can form protrusions on the side end portion on the side indicated by arrow a and the side end portion on the side indicated by arrow b.
- the protrusion 101 is formed along the side end of the inclined portion 107 on the side indicated by the arrow a.
- the protrusion 102 is formed along the side end portion of the inclined portion 109 on the side indicated by the arrow b.
- the protrusion 101 and the protrusion 102 are configured to protrude horizontally along the cam groove 103 to form a wall surface.
- a configuration in which a plurality of protrusions are formed along the cam groove 103 may be used.
- any protrusion provided along the cam groove 103 may be used.
- FIG. 12A is a perspective view of the front surface of the drive frame 200 as viewed obliquely from above.
- FIG. 12B is an enlarged perspective view of the vicinity of the meshing teeth 204 to 209 in FIG. 12A.
- FIG. 13 is a top view of the drive frame 200.
- FIG. 14 is a side view of the drive frame 200.
- the cam follower 201, the cam follower 202, and the cam follower 203 are formed on the outer peripheral surface of the drive frame 200.
- the cam follower 201, the cam follower 202, and the cam follower 203 can be movably fitted in cam grooves 103 to 105 formed in the fixed frame 100.
- the drive frame 200 has a plurality of meshing teeth 200 a including a meshing tooth 204, a meshing tooth 205, a meshing tooth 206, a meshing tooth 207, a meshing tooth 208, and a meshing tooth 209 on the outer peripheral surface.
- These meshing teeth mesh with teeth such as gears (not shown) arranged inside or outside a lens barrel (not shown).
- the meshing teeth 204 to 209 are formed with notches 204a to 209a, respectively.
- the cutout portions 205a, 206a, 207a, 208a are cut out in a substantially horizontal shape with respect to the circumferential direction of the drive frame 200.
- the notches 204 a and 209 a are notched in an inclined manner with respect to the circumferential direction of the drive frame 200.
- cam followers 201, 202, 203 and a plurality of meshing teeth 200a are formed on the same circumference of the outer peripheral surface (see FIG. 13).
- cam followers 201, 202, 203 and a plurality of meshing teeth 200a are formed in the vicinity of the end of the drive frame 200 in the optical axis L direction (see FIGS. 12A and 14).
- three cam followers and a plurality of meshing teeth are provided on the same circumference on the outer peripheral surface of the drive frame 200.
- such a configuration is not necessarily required, and it is sufficient that the three cam followers and the plurality of meshing teeth are on substantially the same circumference.
- the lens barrel according to the present embodiment can be made the thinnest among the lens barrels having the same movement distance along the optical axis direction of the lens with respect to the fixed frame 100 of the drive frame 200. . That is, since the width dimension of the fixed frame 100 in the optical axis direction can be reduced, the lens barrel can be thinned.
- the drive frame 200 has a raised body 210 formed on the outer peripheral surface.
- the raised body 210 is formed in the vicinity of the end in the optical axis direction on the outer peripheral surface of the drive frame 200.
- the raised body 210 is formed along the circumferential direction of the drive frame 200.
- the raised body 210 is raised on the outer periphery of the drive frame 200 as compared with other flat portions.
- a gap 211 exists between the raised body 210 and the cam follower 201.
- the gap portion 211 is a valley portion formed by being sandwiched between the raised body 210 and the cam follower 201 on both sides.
- FIG. 15 to 18 are developed views of the inside of the unit in which the drive frame 200 is incorporated at a predetermined position in the fixed frame 100.
- FIG. FIG. 19 is a schematic top view of a unit in which the drive frame 200 is incorporated at a predetermined position in the fixed frame 100 as viewed from above.
- 20A is a cross-sectional view taken along the line V1-V1 in FIG. 20B is a cross-sectional view taken along the line V2-V2 in FIG.
- hatching is added to clearly show the protrusion 101, the protrusion 102, and the raised body 210.
- the fixed frame 100 and the components included in it are drawn with thin lines
- the drive frame 200 and the components included in it are drawn with thick lines.
- the fixed frame 100 is formed in a substantially cylindrical shape, and the drive frame 200 can be incorporated in the internal space.
- the drive frame 200 has the cam follower 201 fitted into the cam groove 103, the cam follower 202 fitted into the cam groove 104, and the cam follower 203 fitted into the cam groove 105. Retained.
- the plurality of meshing teeth 200a formed on the drive frame 200 mesh with teeth (not shown) such as gears arranged inside or outside the lens barrel.
- the drive frame 200 obtains power in the rotational direction with respect to the fixed frame 100 via the meshing teeth 200a when the gear meshed with the meshing teeth 200a rotates.
- the cam grooves 103 to 105 into which the cam followers 201 to 203 are fitted can be decomposed into a component in the optical axis L direction of the lens held by the drive frame 200 and a component in the rotation direction of the drive frame 200 with respect to the fixed frame 100. It is formed in the direction.
- the direction in which the cam grooves 103 to 105 are formed has a rotational direction component of the drive frame 200 with respect to the fixed frame 100, so that the drive frame 200 obtains power in the rotational direction with respect to the fixed frame 100.
- the cam followers 201 to 203 move along the cam grooves 103 to 105.
- the drive frame 200 moves along the optical axis L direction of the lens held by itself. This is because the direction in which the cam grooves 103 to 105 are formed has a component in the optical axis L direction of the lens held in the drive frame 200.
- FIG. 15 shows a state in which the cam follower 201 is located within the range of the inclined portion 109 in the cam groove 103.
- the protrusion 101 forms a wall surface along the cam groove 103. That is, the side surface 101 a of the protrusion 101 is adjacent to the inner wall surface 103 a of the cam groove 103.
- the cam follower 201 contacts the protrusion 101 and the cam groove 103 within the range where the protrusion 101 is formed.
- the cam follower 201 abuts only on the cam groove 103 in other ranges. Therefore, the area where the cam follower 201 contacts the fixed frame 100 is larger in the range where the protrusions 101 are formed than in other ranges.
- the cam follower 201 when the cam follower 201 is located at the position shown in FIG. 15, even if an external force of a predetermined amount or more is applied to the lens barrel in the direction shown by the arrow a, the direction shown by the arrow a applied to the cam follower 201 Is received by the side surface 101 a of the protrusion 101 and the inner wall surface 103 a of the cam groove 103. Therefore, the cam follower 201 can be prevented from being detached from the cam groove 103.
- the cam follower 201 and the meshing teeth 200a can be disposed at a closer position.
- the drive frame 200 can be provided with a larger number of meshing teeth.
- the drive frame 200 can secure a larger amount of rotation by increasing the number of meshing teeth.
- the lens barrel according to the present embodiment can perform lens driving with higher accuracy.
- the meshing teeth 204 are formed with inclined notches 204a as shown in FIG.
- the cutout portion 204a formed in the meshing tooth 204 is not necessarily inclined, and may be a cutout having a substantially horizontal shape such as the cutout portion 205a. In short, any shape may be employed as long as the meshing teeth 204 are provided with notches so that the protrusions 101 and the meshing teeth 204 do not interfere with each other.
- the protrusion 101 is disposed between the cam follower 201 and the meshing teeth 204 as shown in FIG. . Further, the protrusion 101 and the cam follower 201 are separated from each other, and the protrusion 101 and the meshing teeth 204 are separated from each other.
- FIG. 16 is a development view of the fixed frame 100 and the drive frame 200 in a state where the fixed frame 100 holds the drive frame 200 at a position near the wide angle.
- the protrusion 101 forms a wall surface along the cam groove 103 (see the side surface 101a and the inner wall surface 103a in FIG. 20A). Therefore, the area where the cam follower 201 contacts the fixed frame 100 is larger in the range where the protrusions 101 are formed than in other ranges. As a result, the protrusion 101 can prevent the cam follower 201 from being detached from the cam groove 103 when an external force of a predetermined amount or more is applied to the lens barrel in the direction indicated by the arrow a.
- the raised body 210 and the protrusion 102 are located in a considerably close position. However, the protruding body 210 and the protrusion 102 are separated with a slight gap therebetween. In this state, when a predetermined amount or more of external force is applied to the lens barrel in the direction indicated by the arrow a, the raised body 210 and the protrusion 102 come into contact with each other. It is possible to prevent the cam follower 201 from being detached from the cam groove 103 when the raised body 210 and the protrusion 102 come into contact with each other.
- the tip end portion 212 of the raised body 210 and the protrusion 102 are in contact with each other.
- any configuration may be used as long as the end portion of the drive frame 200 and the protrusion 102 come into contact with each other when a predetermined amount or more of external force is applied to the drive frame 200.
- the tip end portion 212 of the raised body 210 is cut away in parallel to the moving direction of the inclined portion 107 of the cam follower 201.
- the raised body 210 can be maximized within a range in which the distal end portion 212 of the raised body 210 and the protrusion 102 are separated from each other.
- the protrusion 101 is arranged between the cam follower 201 and the meshing teeth 204 as shown in FIG. Further, in the state shown in FIG. 16, the protrusion 101 and the cam follower 201 are separated from each other, and the protrusion 101 and the meshing teeth 204 are separated from each other.
- the cam follower of the drive frame 200 when the cam follower of the drive frame 200 is located within the range of the area A, the digital camera is not ready for photographing.
- the cam follower of the drive frame 200 when the cam follower of the drive frame 200 is located within the range of the region B, the digital camera is ready for photographing.
- the protrusion 101 is formed in the vicinity of the position where the cam follower 201 exists when the drive frame 200 is at a position between the telephoto position and the wide-angle position (position where the digital camera can be photographed).
- the protrusion 102 is formed in the vicinity of the position where the end of the raised body 210 (the end of the fixed frame 100 in the circumferential direction) exists when the drive frame 200 is positioned at the wide angle position. .
- the protrusion 101 is formed along the range in which the cam follower 201 moves in a state in which a subject can be photographed by the digital camera. . That is, the protrusion 101 is formed along a range in which the cam follower 201 moves when a lens (not shown) moves between the telephoto end and the wide-angle end. However, the protrusion 101 is not formed at a position along the range in which the cam follower 201 moves in a state where the subject cannot be photographed by the digital camera.
- the protrusion 102 is formed along the range in which the raised body 210 moves in a state where photographing at a wide-angle position is possible. However, the protrusion 102 is not formed at a position along the range in which the raised body 210 moves in a state where photographing with a digital camera is impossible. The reason why the protrusions 101 and 102 are configured as described above will be described below.
- a lens storage state a state in which photography with a digital camera is impossible
- external force is applied in the direction indicated by arrow a with respect to the lens barrel provided in the digital camera.
- the cam follower 201 when the cam follower 201 is located at the end of the cam groove 103 in the direction indicated by the arrow a, the cam follower 201 exists even if an external force is applied to the lens barrel in the direction indicated by the arrow a. Therefore, the cam follower 201 is not detached from the cam groove 103 because the image pickup device of the digital camera body, etc., existing on the side indicated by the arrow a from the position to be used as a wall.
- the cam follower 201 exists in the area B of the cam groove 103 in a state where photographing is possible. In this case, there is a space where the cam follower 201 can exist on the side indicated by the arrow a from the position where the cam follower 201 exists. Therefore, the cam follower 201 may be detached from the cam groove 103 when an external force is applied to the lens barrel in the direction indicated by the arrow a.
- the protrusion 101 and the protrusion 102 are separated within a range in which the cam follower 201 may be detached from the cam groove 103. Provided.
- the raised body 210 and the cam follower 201 are raised on the outer periphery of the drive frame 200 as compared with the gap 211. Accordingly, a space is formed between the inner peripheral surface of the fixed frame 100 and the gap 211 when the fixed frame 100 incorporates the drive frame 200. A space formed by the gap 211 and the inner peripheral surface of the fixed frame 100 passes over the protrusion 102 as the cam follower 201 moves through the cam groove 103. That is, even if the protrusion 102 is provided on the inner peripheral surface of the fixed frame 100, it does not come into contact with the protrusion 102 when the drive frame 200 moves relative to the fixed frame 100. Therefore, the drive frame 200 is not prevented from moving by the protrusions 102.
- FIG. 17 shows a state in which the fixed frame 100 holds the drive frame 200 at a position near the wide angle.
- FIG. 18 shows a state in which the fixed frame 100 holds the drive frame 200 at a position where photographing with a digital camera is impossible.
- the protrusion 101 and the plurality of meshing teeth including the meshing teeth 206 and the meshing teeth 207 are not engaged. This is because the notches 206a, 207a, 208a, and 209a are formed in the meshing teeth 206, the meshing teeth 207, the meshing teeth 208, and the meshing teeth 209, respectively, as shown in FIG. 12B.
- the cutout portions 204a and 209a formed in a substantially oblique direction and the cutout portions 205a, 206a, 207a and 208a formed in a substantially horizontal direction are formed in a continuous shape.
- the cam follower 201 included in the drive frame 200 is moved along a cam groove having a complicated shape such as the cam groove 103, the protrusion 101 and the plurality of meshing teeth are separated from each other. Therefore, the protrusion 101 does not hinder the movement of the drive frame 200.
- the protrusion that supports the cam follower 201 is not provided along the cam groove 103 at the wide-angle position (horizontal portion 108). This is because the cam follower 201 is difficult to be removed from the cam groove 103 in the first place in a state where the cam follower 201 is positioned in the horizontal portion 108 of the cam groove 103.
- a projecting body that supports the cam follower 201 may be provided along the cam groove 103 even at a wide angle position.
- the space formed by the gap 211 and the inner peripheral surface of the fixed frame 100 passes over the protrusion 102 as the cam follower 201 moves through the cam groove 103.
- the drive frame 200 further moves in the direction indicated by the arrow a from the state shown in FIG. 18, the space formed by the gap 211 and the inner peripheral surface of the fixed frame 100 completely passes over the protrusion 102.
- Embodiment 1 and Embodiment 2 are illustrated.
- the present invention is not limited to these embodiments. Therefore, another embodiment of the present invention will be described below.
- the fixed frame and the drive frame constituting the lens barrel according to the first and second embodiments are not limited to the lens barrel shown in FIGS.
- the lens barrel shown in FIGS. 1 to 19 exemplifies the fixed frame 100 in which three cam grooves 103 to 105 are formed.
- the lens barrel has a configuration having a number of cam grooves other than three. Can do.
- the fixed frame 100 in which the cam grooves 103 to 105 having the horizontal portion 106, the inclined portion 107, the horizontal portion 108, and the inclined portion 109 are formed is formed.
- it can be set as the structure which has a cam groove of other shapes, such as a mere diagonal shape.
- the drive frame 200 in which the three cam followers 201 to 203 are formed is illustrated, but if the number is equal to the number of cam grooves of the fixed frame 100, It can be set as the structure which has the number of cam followers other than three.
- the fixed frame 100 in which the protrusion 101 and the protrusion 102 are formed only in the vicinity of the cam groove 103 is illustrated, but the protrusion 101 is only in the vicinity of the cam groove 103. And it is not restricted to the structure which forms 102.
- the protrusions 101 and 102 may be formed in the cam groove 104 and the cam groove 105, and the protrusions may be formed along the plurality of cam grooves.
- the fixed frame 100 in which the protrusion 101 and the protrusion 102 are formed along the cam groove 103 is illustrated.
- both the protrusion 101 and the protrusion 102 are provided. It does not necessarily need to be formed, and any one protrusion may be formed.
- the protrusion 102 is provided along the cam groove 103.
- the protrusions 112a, 112b, and 112c may be formed in a range away from the cam groove 103 as shown in FIG.
- the protrusions only need to be provided between any two adjacent cam grooves of the plurality of cam grooves of the fixed frame 100.
- FIG. 22 is a plan view showing another configuration example of the cam follower.
- the cam follower shown in FIG. 22 has a planar shape of a substantially parallelogram and two opposing obtuse angle portions are arcuate.
- the side surface 301 and the side surface 302 are substantially parallel.
- the side surface 303 and the side surface 304 are substantially parallel.
- the angle ⁇ 1 between the side surface 301 and the side surface 303 and the angle ⁇ 2 between the side surface 302 and the side surface 304 are substantially the same angle, and each is less than 90 degrees.
- FIG. 22 is a plan view showing another configuration example of the cam follower.
- the cam follower shown in FIG. 22 has a planar shape of a substantially parallelogram and two opposing obtuse angle portions are arcuate.
- the side surface 301 and the side surface 302 are substantially parallel.
- the side surface 303 and the side surface 304 are substantially parallel.
- FIG. 23 is a schematic diagram showing a cam groove into which the cam follower shown in FIG. 22 is fitted.
- Angles ⁇ 3 and ⁇ 4 shown in FIG. 23 are angles of the cam groove 400 in the region 400d.
- the angle ⁇ 1 is equal to or greater than the angle ⁇ 3, and the angle ⁇ 2 is equal to or greater than the angle ⁇ 4.
- the cam follower 300 When the cam follower 300 is located in the region 400d (for example, the position indicated by the broken line 300d), a part of the side surface 301 and a part of the side surface 302 are in contact with the inner wall of the cam groove 400.
- the cam follower 300 When the cam follower 300 is positioned in the region 400e (for example, the position indicated by the broken line 300e), the side surfaces 303 and 304 are in contact with the inner wall of the cam groove 400.
- the cam follower 300 is shaped as shown in FIG. 22 so that when the cam follower 300 is located in the region 400b or 400d, the contact area with the inner wall of the cam groove 400 is compared with that of a substantially oval cam follower. Can be large.
- the contact area with the inner wall of the cam groove 400 is small, and the contact pressure is concentrated. Therefore, when the cam follower moves in the cam groove, the inner wall of the cam groove may be shaved. In addition, a portion of the cam follower that is in contact with the inner wall of the cam groove may be worn. Further, when the cumulative movement distance of the cam follower is increased, the inner wall of the cam groove or the cam follower is greatly shaved, and rattling may occur between the cam follower and the cam groove.
- the contact area with the inner wall of the cam groove 400 can be increased.
- the contact pressure applied to the inner wall of the cam groove 400 or the cam follower can be dispersed. Therefore, it can reduce that a cam follower scrapes the inner wall of a cam groove. Moreover, it is possible to reduce the wear of the cam follower. Therefore, it is possible to suppress the occurrence of rattling between the cam follower and the cam groove.
- the cross-sectional area of the cam follower can be increased, so that the rigidity of the cam follower can be increased.
- the fixed frame 10 is an example of a fixed frame in the present invention.
- the drive frame 20 is an example of a drive frame in the present invention.
- region 12e in the cam groove 12 are examples of the 1st area
- region 12d in the cam groove 12 are examples of the 2nd area
- the rectilinear frame 30 is an example of a rectilinear frame in the present invention.
- the straight key 32 is an example of a protrusion in the present invention.
- the raised body 210 is an example of a raised body in the present invention.
- the protrusion 101 is an example of a first protrusion in the present invention.
- the protrusion 102 is an example of a second protrusion in the present invention.
- the present invention is useful for a lens barrel mounted on an imaging apparatus such as a digital camera, a video camera, a silver salt camera, and a camera-equipped mobile phone terminal.
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Abstract
Description
〔1.撮像装置の構成〕
図1は、本実施の形態のレンズ鏡筒を備えた装置の一例を示す。図1に示す装置は、デジタルカメラに搭載される撮像装置である。撮像装置1は、その内部にズームレンズやフォーカスレンズなどの各種レンズや、入射する光を電気信号に変換して出力する撮像素子などを備えている。なお、本実施の形態に示す撮像装置は一例であり、デジタルカメラに限らず、ビデオカメラなどにも搭載が可能である。
図3は、駆動枠20の平面図であり、図2における矢印Bに示す方向に見た図である。図3に示すように、駆動枠20の外面には3個のカムフォロワ22が形成されている。図4Aは、駆動枠20におけるカムフォロワ22近傍の上面図である。図4Bは、図4AにおけるZ-Z部の断面図である。図4Cは、カムフォロワ22の拡大図を示す。
図5に示すように、本実施の形態の直進溝13は、カム溝12の第1領域12aの一部に重なるように形成されている。また、直進溝13に直進キー(後述)を挿入するための開口部は、カム溝12の開口部12fと同一位置に形成されている。
本実施の形態によれば、カムフォロワ22の外径を大きくしたことにより、カムフォロワ22の剛性を上げることができ、撮像装置1に対して外部から衝撃が加わった際にカムフォロワ22が破損する可能性を低減することができる。
〔1.撮像装置の構成〕
実施の形態2に係る撮像装置は、実施の形態1に係る撮像装置のように、固定枠、駆動枠,直進枠、1群ユニット、2群ユニット、および基体を備えている。
図11は、固定枠100の内周面を展開した展開図である。
図12Aは、駆動枠200の正面を斜め上から見た斜視図である。図12Bは、図12Aにおける噛合歯204~209の近傍の拡大斜視図である。図13は、駆動枠200の上面図である。図14は、駆動枠200の側面図である。
図15~図18は、固定枠100における所定の位置に駆動枠200が組み込まれたユニットの、内側の展開図である。図19は、固定枠100における所定の位置に駆動枠200が組み込まれたユニットを上面から見た上面模式図である。図20Aは、図15におけるV1-V1部の断面図である。図20Bは、図15におけるV2-V2部の断面図である。なお、図15~図18において、突起体101,突起体102,および隆起体210を明確に図示するためにハッチングを付した。また、図15~図18において、固定枠100およびそれに含まれる構成は細線で描画し、駆動枠200およびそれに含まれる構成は太線で描画した。
本発明の実施の形態として、上述の通り、実施の形態1及び実施の形態2を例示した。しかし、本発明は、これらの実施の形態に限定されない。そこで、本発明の他の実施の形態を、以下まとめて説明する。
Claims (10)
- 撮影のためのレンズを保持するレンズ鏡筒であって、
内周面上にカム溝が形成された固定枠と、
外周面上に設けられたカムフォロアと、外周面上において前記カムフォロアと略同一円周上に設けられた複数の噛合歯と、を有する駆動枠と、を備え、
前記駆動枠は、
前記固定枠内に組み込まれた状態で、前記カムフォロアが前記カム溝に嵌合し、前記噛合歯を介して駆動力が伝達され、前記カムフォロアが前記カム溝に沿って移動することに伴って、前記レンズの光軸方向に沿って前記固定枠に対して移動可能であり、
前記固定枠は、前記カム溝に沿って設けられた第1の突起体を備え、
前記第1の突起体は、
前記駆動枠と前記固定枠とが所定の位置関係にある場合において、前記カムフォロアと、前記複数の噛合歯のうち前記カムフォロアに最も近い噛合歯との間に配置される、レンズ鏡筒。 - 前記カムフォロアに最も近い噛合歯は、前記第1の突起体と干渉しないように切り欠き部を有する、請求項1に記載のレンズ鏡筒。
- 前記駆動枠は、前記切り欠き部を有する噛合歯を複数有し、
前記切り欠き部を有する複数の噛合歯は、連続的に配置されている、請求項1または請求項2に記載のレンズ鏡筒。 - 前記切り欠き部を有する複数の噛合歯のうち、一方の端若しくは両端にある歯は、切り欠き部を有している他の歯と比べ、異なる形状の切り欠き部を有している、請求項3に記載のレンズ鏡筒。
- 前記固定枠は、所定数の前記カム溝を有し、
前記駆動枠は、前記固定枠に組み込まれた状態で、前記所定数のカム溝にそれぞれ嵌合する前記所定数のカムフォロアを有する、請求項1~4のいずれか一項に記載のレンズ鏡筒。 - 前記第1の突起体は、少なくとも一つの前記カム溝に沿って設けられている、請求項5に記載のレンズ鏡筒。
- 前記固定枠は、
前記駆動枠に対して外力が加わった際に、前記駆動枠の端部に当接して、前記カムフォロアが前記カム溝から外れることを防止できる第2の突起体を、さらに備える、請求項1~6のいずれか一項に記載のレンズ鏡筒。 - 前記駆動枠は、前記駆動枠の端面近傍にさらに隆起部を有し、
前記駆動枠の端部は、前記隆起部の一部又は全部であり、
前記駆動枠に対して外力が加わった際に、前記隆起部が前記第2の突起体に当接することにより、前記カムフォロアが前記カム溝から外れることを防止する、請求項7のいずれか一項に記載のレンズ鏡筒。 - 前記駆動枠の外周面上において、前記端部と、前記端部に最も近いカムフォロアとは、所定の長さ離れており、
前記駆動枠に外力が加わらない状態で、前記カムフォロアが前記カム溝を移動することにより、前記駆動枠が前記第1の突起体に係合することはない、請求項5に記載のレンズ鏡筒。 - 前記カム溝は、前記固定枠の円周方向に略平行な平行部と、前記固定枠の円周方向に対して傾斜した傾斜部とを備え、
前記レンズはズームレンズであり、
前記カムフォロワは、前記カム溝の傾斜部に沿って移動することに伴って、前記ズームレンズが広角端から望遠端の間を移動する、請求項1~9のいずれか一項に記載のレンズ鏡筒。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US12/864,082 US8547647B2 (en) | 2008-01-25 | 2009-01-23 | Lens barrel |
CN200980102896.1A CN101925843B (zh) | 2008-01-25 | 2009-01-23 | 透镜镜筒 |
JP2009525825A JP5211055B2 (ja) | 2008-01-25 | 2009-01-23 | レンズ鏡筒 |
US14/011,299 US8780456B2 (en) | 2008-01-25 | 2013-08-27 | Lens barrel |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2008-015370 | 2008-01-25 | ||
JP2008015370 | 2008-01-25 | ||
JP2008-028788 | 2008-02-08 | ||
JP2008028787 | 2008-02-08 | ||
JP2008028788 | 2008-02-08 | ||
JP2008-028787 | 2008-02-08 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US12/864,082 A-371-Of-International US8547647B2 (en) | 2008-01-25 | 2009-01-23 | Lens barrel |
US14/011,299 Continuation US8780456B2 (en) | 2008-01-25 | 2013-08-27 | Lens barrel |
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WO2009093474A1 true WO2009093474A1 (ja) | 2009-07-30 |
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PCT/JP2009/000274 WO2009093475A1 (ja) | 2008-01-25 | 2009-01-23 | レンズ鏡筒 |
PCT/JP2009/000273 WO2009093474A1 (ja) | 2008-01-25 | 2009-01-23 | レンズ鏡筒 |
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US (4) | US8223441B2 (ja) |
JP (3) | JP5211055B2 (ja) |
CN (3) | CN103217772B (ja) |
WO (2) | WO2009093475A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011039098A (ja) * | 2009-08-06 | 2011-02-24 | Canon Inc | レンズ鏡筒及び撮像装置 |
JP2011138079A (ja) * | 2009-12-30 | 2011-07-14 | Sony Corp | レンズ鏡筒及び撮像装置 |
CN102455477A (zh) * | 2010-10-29 | 2012-05-16 | 鸿富锦精密工业(深圳)有限公司 | 镜头装置 |
US8665535B2 (en) | 2009-07-27 | 2014-03-04 | Panasonic Corporation | Lens barrel and imaging device |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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JP5639355B2 (ja) * | 2009-11-12 | 2014-12-10 | 日東光学株式会社 | レンズホルダー |
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JP6485505B2 (ja) * | 2017-08-10 | 2019-03-20 | 株式会社ニコン | レンズ鏡筒および撮像装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006065138A (ja) * | 2004-08-30 | 2006-03-09 | Nidec Copal Corp | レンズ駆動装置 |
JP2006227214A (ja) * | 2005-02-16 | 2006-08-31 | Canon Inc | 光学機器 |
JP2008175921A (ja) * | 2007-01-17 | 2008-07-31 | Canon Inc | レンズ装置及び撮像装置 |
Family Cites Families (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2952078C2 (de) * | 1979-12-22 | 1981-07-09 | Fa. Carl Zeiss, 7920 Heidenheim | Einrichtung zur spielfreien Kurvensteuerung |
JP2748784B2 (ja) * | 1992-07-27 | 1998-05-13 | ヤマハ株式会社 | 波形生成装置 |
JPH0651178A (ja) | 1992-07-31 | 1994-02-25 | Olympus Optical Co Ltd | 鏡 筒 |
JPH08254644A (ja) | 1995-03-15 | 1996-10-01 | Canon Inc | レンズ鏡筒及びそれを用いた光学機器 |
JP3415540B2 (ja) * | 1999-02-19 | 2003-06-09 | オリンパス光学工業株式会社 | ズームレンズ鏡筒 |
JP3495664B2 (ja) * | 1999-10-27 | 2004-02-09 | ペンタックス株式会社 | ズームレンズ鏡筒 |
JP5047410B2 (ja) | 2000-03-31 | 2012-10-10 | オリンパス株式会社 | レンズ鏡筒 |
US6487025B2 (en) * | 2000-03-31 | 2002-11-26 | Olympus Optical Co., Ltd. | Lens barrel having a plurality of lens frames which are relatively movable in forward and backward directions |
JP3679683B2 (ja) * | 2000-05-16 | 2005-08-03 | キヤノン株式会社 | 撮像装置 |
JP4580516B2 (ja) * | 2000-07-12 | 2010-11-17 | オリンパス株式会社 | 鏡枠装置 |
JP2003057522A (ja) * | 2001-08-20 | 2003-02-26 | Nidec Copal Corp | レンズ鏡胴 |
JP3949979B2 (ja) | 2002-02-27 | 2007-07-25 | オリンパス株式会社 | レンズ鏡筒 |
US6989944B2 (en) * | 2001-09-18 | 2006-01-24 | Olympus Corporation | Camera |
JP2003222777A (ja) | 2002-01-29 | 2003-08-08 | Fuji Photo Optical Co Ltd | ズーム連動機構 |
JP4050930B2 (ja) | 2002-04-22 | 2008-02-20 | 日本電産コパル株式会社 | レンズ駆動装置 |
JP4359115B2 (ja) * | 2003-10-22 | 2009-11-04 | パナソニック株式会社 | 沈胴式レンズ鏡筒 |
JP4759241B2 (ja) * | 2003-10-27 | 2011-08-31 | キヤノン株式会社 | レンズ鏡筒および撮影装置 |
JP4575114B2 (ja) * | 2003-12-24 | 2010-11-04 | オリンパス株式会社 | ズームレンズ鏡筒 |
JP2005308852A (ja) | 2004-04-19 | 2005-11-04 | Sony Corp | 沈胴式レンズ鏡筒および撮像装置 |
JP4387914B2 (ja) * | 2004-09-28 | 2009-12-24 | キヤノン株式会社 | レンズ装置および撮影装置 |
US7426085B2 (en) * | 2004-11-05 | 2008-09-16 | Matsushita Electric Industrial Co., Ltd. | Lens barrel, imaging device and camera |
JP4599198B2 (ja) * | 2005-03-14 | 2010-12-15 | キヤノン株式会社 | レンズ保持ユニット |
US7572072B2 (en) * | 2005-07-01 | 2009-08-11 | Canon Kabushiki Kaisha | Lens barrier driving device, lens barrel, and image pickup apparatus |
JP4343928B2 (ja) | 2005-07-01 | 2009-10-14 | キヤノン株式会社 | レンズバリア駆動装置、レンズ鏡筒、及び撮像装置 |
JP4178556B2 (ja) | 2005-09-28 | 2008-11-12 | フジノン株式会社 | レンズ装置 |
JP5065588B2 (ja) * | 2005-11-22 | 2012-11-07 | オリンパス株式会社 | レンズ鏡筒およびレンズ鏡筒システム |
JP5006576B2 (ja) | 2006-05-26 | 2012-08-22 | 株式会社リコー | レンズ鏡胴、このレンズ鏡胴を用いたカメラ、デジタルカメラ、携帯型情報端末装置、及び、画像入力装置 |
JP2007333764A (ja) | 2006-06-12 | 2007-12-27 | Nikon Corp | レンズ鏡筒、カメラ |
CN101241219B (zh) * | 2007-02-08 | 2012-09-05 | 松下电器产业株式会社 | 摄像装置 |
JP5080842B2 (ja) * | 2007-04-04 | 2012-11-21 | 株式会社カネカ | ポリプロピレン系樹脂予備発泡粒子および型内発泡成形体 |
CN103217772B (zh) * | 2008-01-25 | 2016-03-30 | 松下电器产业株式会社 | 透镜镜筒 |
-
2009
- 2009-01-23 CN CN201310101272.6A patent/CN103217772B/zh active Active
- 2009-01-23 US US12/864,138 patent/US8223441B2/en active Active
- 2009-01-23 WO PCT/JP2009/000274 patent/WO2009093475A1/ja active Application Filing
- 2009-01-23 JP JP2009525825A patent/JP5211055B2/ja active Active
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- 2009-01-23 WO PCT/JP2009/000273 patent/WO2009093474A1/ja active Application Filing
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- 2013-02-25 JP JP2013034377A patent/JP5661830B2/ja active Active
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006065138A (ja) * | 2004-08-30 | 2006-03-09 | Nidec Copal Corp | レンズ駆動装置 |
JP2006227214A (ja) * | 2005-02-16 | 2006-08-31 | Canon Inc | 光学機器 |
JP2008175921A (ja) * | 2007-01-17 | 2008-07-31 | Canon Inc | レンズ装置及び撮像装置 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8665535B2 (en) | 2009-07-27 | 2014-03-04 | Panasonic Corporation | Lens barrel and imaging device |
JP2011039098A (ja) * | 2009-08-06 | 2011-02-24 | Canon Inc | レンズ鏡筒及び撮像装置 |
JP2011138079A (ja) * | 2009-12-30 | 2011-07-14 | Sony Corp | レンズ鏡筒及び撮像装置 |
CN102455477A (zh) * | 2010-10-29 | 2012-05-16 | 鸿富锦精密工业(深圳)有限公司 | 镜头装置 |
Also Published As
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CN103185944B (zh) | 2015-06-17 |
US20100296176A1 (en) | 2010-11-25 |
CN103185944A (zh) | 2013-07-03 |
JPWO2009093474A1 (ja) | 2011-05-26 |
JP2013101406A (ja) | 2013-05-23 |
WO2009093475A1 (ja) | 2009-07-30 |
CN103217772B (zh) | 2016-03-30 |
US20130342917A1 (en) | 2013-12-26 |
US8547647B2 (en) | 2013-10-01 |
JPWO2009093475A1 (ja) | 2011-05-26 |
JP5211055B2 (ja) | 2013-06-12 |
CN101925843A (zh) | 2010-12-22 |
US8780456B2 (en) | 2014-07-15 |
US8223441B2 (en) | 2012-07-17 |
CN103217772A (zh) | 2013-07-24 |
CN101925843B (zh) | 2013-05-01 |
US20100290132A1 (en) | 2010-11-18 |
US20120307380A1 (en) | 2012-12-06 |
US8456755B2 (en) | 2013-06-04 |
JP5661830B2 (ja) | 2015-01-28 |
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