JP2012141536A - Optical device and optical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device and an optical instrument capable of acquiring excellent optical characteristics.SOLUTION: An optical device relating to the invention comprises: a first holding frame (40) for holding an optical system (L4); a second holding frame (50) for holding the first holding frame; an elastic body (62) that is arranged between the first and second holding frames in a direction intersecting an optical axis of the optical system; an aligning member (61) that is arranged in a manner putting the first holding frame between it and the elastic body in the direction intersecting the optical axis, and presses the first holding frame towards the elastic body; and an eccentric member (71) that has an axis line in the direction intersecting the optical axis, and rotates around the axis line to put the first holding frame into a state of being fixed to the second holding frame or in a state of not being fixed to the second holding frame.

Description

  The present invention relates to an optical device and an optical apparatus.

  Conventionally, a method for adjusting the optical axis of a lens held in a lens barrel has been proposed. For example, a lens frame configured to displace the lens holding frame in the lens radial direction by moving a plurality of adjustment screws in contact with the outer peripheral surface of the lens holding frame in the radial direction of the lens is known. (See Patent Document 1).

JP 2004-109710 A

  An object of the present invention is to provide an optical device and an optical apparatus that can obtain good optical characteristics.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
The first aspect of the present invention is the first holding frame (40) for holding the optical system, the second holding frame (50) for holding the first holding frame, and the direction intersecting the optical axis of the optical system. The first holding frame is sandwiched between the elastic body (62) disposed between the first holding frame and the second holding frame and the elastic body in a direction crossing the optical axis. The alignment member (61) that is disposed and presses the first holding frame toward the elastic body, and has an axis in a direction intersecting the optical axis, and rotates about the axis, thereby the first And an eccentric member (71) for fixing the first holding frame to the second holding frame or not fixing the first holding frame to the second holding frame. It is an optical device.
According to a second aspect of the present invention, in the optical device according to the first aspect, the second holding frame (50) is a fixing that restricts the movement of the first holding frame (40) in the direction of the optical axis. A member (52) is provided, wherein the eccentric member (71) rotates about an axis intersecting the optical axis so as to sandwich the first holding frame between the member and the fixing member.
The invention according to claim 3 is the optical device according to claim 1 or 2, further comprising a biasing member (69) for biasing the first holding frame (40A) in the direction of the optical axis. And
According to a fourth aspect of the present invention, in the optical device according to any one of the first to third aspects, the eccentric member (71) is the first holding member when viewed from the direction of the optical axis. It is arranged at three positions at equal intervals along the outer periphery of the frame (40).
According to a fifth aspect of the present invention, in the optical device according to any one of the first to fourth aspects, the alignment member (61) is disposed in the vicinity of the eccentric member (71). It is characterized by.
Invention of Claim 6 is an optical instrument (1) provided with the optical apparatus as described in any one of Claims 1-5.
Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  ADVANTAGE OF THE INVENTION According to this invention, the optical apparatus and optical instrument which can acquire a favorable optical characteristic can be provided.

It is a schematic sectional drawing of the lens-barrel 1 in 1st Embodiment. FIG. 2 is a schematic cross-sectional view showing a configuration of a fixing member 52 and a lens holding frame 40 corresponding to a cross section taken along line AA of FIG. 3 is a schematic cross-sectional view showing the configuration of the alignment screw 61. FIG. 3 is a schematic cross-sectional view showing a configuration of a pressing spring 62. FIG. It is a schematic sectional drawing which shows the structure in the non-fixed state of eccentric pin 71. 4 is a schematic cross-sectional view showing a configuration of the eccentric pin 71 in a fixed state. FIG. (A), (b) is a schematic plan view when the eccentric pin 71 is seen from an axial direction. It is a schematic sectional drawing which shows the structure of optical axis fixing mechanism 70D in 2nd Embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an optical device according to the present invention and an optical apparatus including the optical device will be described with reference to the drawings.

  In each of the drawings shown below, an XYZ orthogonal coordinate system is appropriately provided in order to facilitate explanation and understanding. In this coordinate system, the direction toward the left as viewed from the photographer at the position of the camera when the photographer shoots a horizontally long image with the optical axis OA horizontal (hereinafter referred to as a normal position) is defined as the X plus direction. Further, the direction toward the upper side in the normal position is defined as the Y plus direction. Further, the direction toward the subject at the normal position is defined as the Z plus direction. The Z plus direction toward the subject in the Z direction is also called the front side, and the Z minus direction is also called the back side.

<First Embodiment>
FIG. 1 is a schematic cross-sectional view of a lens barrel 1 in the first embodiment. FIG. 2 is a schematic cross-sectional view showing the configuration of the fixing member 52 and the lens holding frame 40 corresponding to the cross section taken along the line AA of FIG.
As shown in FIG. 1, the lens barrel 1 of the present embodiment includes a fixed cylinder 10, a cam cylinder 20, an outer cylinder 30, a zoom operation ring 31, and a focus operation ring 32.

  The fixed cylinder 10 is a substantially cylindrical member. A lens mount 1 </ b> M is provided at the base end portion (back end) of the fixed cylinder 10. The lens mount 1M is a member that is detachably engaged with a body mount provided on a camera body (not shown). When the lens mount 1M is engaged with the body mount, the lens barrel 1 is attached to the camera body. A rectilinear groove 11 is formed in the fixed cylinder 10. The rectilinear groove 11 is a groove formed in the fixed cylinder 10 in parallel with the optical axis OA. A cam pin 51 (described later) engages with the rectilinear groove 11.

  The cam cylinder 20 is a substantially cylindrical member. The cam cylinder 20 is provided on the inner peripheral surface side of the fixed cylinder 10. The cam cylinder 20 is concentrically fitted to the inner periphery of the fixed cylinder 10. The cam cylinder 20 is configured to be rotatable with respect to the fixed cylinder 10. The cam cylinder 20 is connected to the zoom operation ring 31 and the focus operation ring 32 via an interlocking mechanism (not shown). When the user rotates the zoom operation ring 31, the cam cylinder 20 rotates about the optical axis OA via the interlocking mechanism.

  A cam groove 21 is formed in the cam cylinder 20. The cam groove 21 is a groove formed obliquely with respect to the optical axis OA in the circumferential direction of the cam cylinder 20. A cam pin 51 (described later) engages with the cam groove 21.

  A connecting member 50 as a second holding frame is provided on the inner peripheral surface side (and the lens mount 1M side) of the cam barrel 20. The connecting member 50 is an annular member for holding a lens holding frame 40 (described later). Although the connecting member 50 is provided in each lens group, FIG. 1 shows only the connecting member 50 corresponding to the fourth lens group L4.

  The connecting member 50 includes a cam pin 51 on the outer peripheral surface side in the radial direction. The cam pin 51 is a member that engages with the rectilinear groove 11 of the fixed cylinder 10 and the cam groove 21 of the cam cylinder 20. The connecting member 50 includes a fixing member 52 on the inner peripheral surface side in the radial direction. The fixing member 52 is an annular member that restricts the lens holding frame 40 from moving in the direction of the optical axis OA.

  The outer cylinder 30 is a substantially cylindrical member that forms the outer surface (a part) of the lens barrel 1. The outer cylinder 30 is provided on the outer peripheral surface side of the fixed cylinder 10.

  The zoom operation ring 31 is provided on the outer peripheral surface side of the outer cylinder 30 and on the front surface side (Z plus direction). The zoom operation ring 31 is rotatably attached to the fixed cylinder 10. The focus operation ring 32 is provided on the outer peripheral surface side of the outer cylinder 30 and on the back surface side (Z minus direction). The focus operation ring 32 is rotatably attached to the fixed cylinder 10.

  Inside the cam cylinder 20 are provided a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L4 (hereinafter referred to as “each lens group” as appropriate). Each lens group is constituted by a plurality of lenses, but in FIG. 1, it is schematically shown by one lens. Each lens group is held by a respective lens holding frame 40 (only the lens holding frame 40 holding the fourth lens group L4 is shown in FIG. 1).

  The lens holding frame 40 is an annular member that holds each lens group. The lens holding frame 40 is provided on the inner peripheral surface side of the connecting member 50. The first lens unit L1 to the fourth lens unit L4 can move along the optical axis OA while being held by the respective lens holding frames 40. Each lens group moves back and forth in a predetermined relationship along the optical axis OA in conjunction with the rotation of the zoom operation ring 31 and the focus operation ring 32.

  That is, the cam pin 51 of the connecting member 50 passes through the cam groove 21 of the cam cylinder 20 and further engages with the rectilinear groove 11 of the fixed cylinder 10. When the user performs an operation of rotating the zoom operation ring 31, the cam cylinder 20 rotates. When the cam cylinder 20 rotates, the cam groove 21 is displaced, so that the cam pin 51 is pushed by the cam groove 21 in the direction of the optical axis OA. The cam pin 51 is engaged with the rectilinear groove 11. For this reason, the connecting member 50 moves along the optical axis OA along the rectilinear groove 11 without rotating around the cam cylinder 20. By such movement of the connecting member 50, the lens groups L1 to L4 held by the respective lens holding frames 40 move along the optical axis OA while displacing their positional relationships.

  The lens holding frame 40 (hereinafter simply referred to as “lens holding frame 40”) that holds the fourth lens group L4 includes optical axis adjustment mechanisms 60A and 60B as shown in FIG. The optical axis adjustment mechanisms 60A and 60B are mechanisms for adjusting the position of the fourth lens unit L4 within a plane intersecting the optical axis OA. The optical axis adjustment mechanisms 60A and 60B can adjust the deviation of the optical axis caused by the dimensional tolerances of components when assembling the lens (hereinafter referred to as “optical axis adjustment” as appropriate).

  Further, as shown in FIG. 2, the lens holding frame 40 includes optical axis fixing mechanisms 70A, 70B, and 70C. The optical axis fixing mechanisms 70A, 70B, and 70C are mechanisms for fixing the position of the lens holding frame 40 whose optical axis has been adjusted. The optical axis fixing mechanisms 70A, 70B, and 70C can prevent the position of the lens holding frame 40 whose optical axis has been adjusted from being displaced due to vibration or impact. That is, the optical performance of the lens group including the fourth lens group L4 can be maintained by fixing the position of the lens holding frame 40 using the optical axis fixing mechanisms 70A, 70B, and 70C. In FIG. 1, the optical axis adjusting mechanisms 60A, 60B and the optical axis fixing mechanisms 70A, 70B, 70C are not shown.

  Next, the configuration of the optical axis adjustment mechanisms 60A and 60B will be described with reference to FIGS. FIG. 3 is a schematic cross-sectional view showing the configuration of the alignment screw 61. FIG. 4 is a schematic cross-sectional view showing the configuration of the pressing spring 62. 3 and 4 are cross sections taken along a plane parallel to the optical axis OA, and show cross sections on opposite sides of the optical axis OA.

  As shown in FIG. 2, the optical axis adjustment mechanisms 60A and 60B are arranged at positions 90 ° apart from each other in the circumferential direction around the optical axis OA. Since the optical axis adjustment mechanisms 60A and 60B of this embodiment have the same configuration, the optical axis adjustment mechanism 60A will be described below as a representative.

  The optical axis adjustment mechanism 60A includes an alignment screw 61 as an alignment member, a pressing spring 62 as an elastic body, and a spring pressing screw 63.

  The alignment screw 61 is a member for adjusting the position of the lens holding frame 40 in the direction of the optical axis OA. The alignment screw 61 is attached to the connecting member 50. A female screw 53 is formed on the connecting member 50. The female screw 53 is a screw hole for attaching the alignment screw 61. The female screw 53 is formed so that the center line of the screw hole intersects the optical axis OA. A male screw 64 and a driver groove 65 are formed in the alignment screw 61.

  As shown in FIG. 3, the alignment screw 61 is used while being screwed into the female screw 53 of the connecting member 50. The alignment screw 61 can be moved (advanced) in the direction of the optical axis OA by engaging the tip of a driver (not shown) with the driver groove 65 and rotating it clockwise. Further, the aligning screw 61 can be moved (retracted) in the direction opposite to the optical axis OA by engaging the driver with the driver groove 65 and rotating it counterclockwise.

  As described above, the alignment screw 61 is disposed so as to sandwich the lens holding frame 40 between the pressing spring 62 (described later) in a plane intersecting the optical axis OA. The lens holding frame 40 can be moved forward or backward in the direction of the pressing spring 62 by rotating the alignment screw 61 clockwise or counterclockwise.

  In addition, in a member (for example, the fixed cylinder 10 or the cam cylinder 20) located on the outer peripheral surface side of the lens holding frame 40, an adjustment for inserting the tip of the driver from the outside at a position corresponding to the alignment screw 61 A hole (not shown) is formed.

  On the other hand, as shown in FIG. 4, a pressing spring 62 and a spring pressing screw 63 are provided at positions opposite to each other with the alignment screw 61 and the optical axis OA interposed therebetween. The pressing spring 62 is an elastic member that biases the lens holding frame 40 in a plane that intersects the optical axis OA. The pressing spring 62 is a compression (coil) spring that generates a biasing force in a direction opposite to the pressed direction. The spring pressing screw 63 is a member for adjusting the urging force of the pressing spring 62.

  A concave portion 66 is formed on the outer peripheral surface side of the lens holding frame 40. The recess 66 is a groove into which one side of the pressing spring 62 is fitted.

  The connecting member 50 is formed with a female screw 54. The female screw 54 is a screw hole for attaching the spring pressing screw 63. The female screw 54 is formed so that the center line of the screw hole intersects the optical axis OA. A male screw 67 and a driver groove 68 are formed in the spring pressing screw 63.

  As shown in FIG. 4, the spring pressing screw 63 is used in a state of being screwed into the female screw 54 of the connecting member 50. The spring holding screw 63 can be moved (advanced) in the direction of the optical axis OA by engaging the tip of a driver (not shown) with the driver groove 68 and rotating it clockwise. The spring retainer screw 63 can be moved (retracted) in the direction opposite to the optical axis OA by engaging the tip of the driver with the driver groove 68 and rotating it counterclockwise. In this way, the urging force of the pressing spring 62 in the direction of the optical axis OA can be adjusted by moving the spring pressing screw 63 in the direction of the optical axis OA or in the opposite direction.

  The pressing spring 62 is disposed between a recess 66 formed in the lens holding frame 40 and the spring pressing screw 63. As described above, the pressing spring 62 is disposed between the lens holding frame 40 and the connecting member 50 in a plane intersecting the optical axis OA.

  In addition, in a member (for example, the fixed cylinder 10 or the cam cylinder 20) positioned on the outer peripheral surface side of the lens holding frame 40, an adjustment for inserting the tip of the driver from the outside at a position corresponding to the spring pressing screw 63. A hole (not shown) is formed.

  Further, as shown in FIGS. 3 and 4, a pressing seat surface 40 a is formed on the lens holding frame 40. The pressing seat surface 40a is formed on the fixing member 52 side. On the other hand, a fixed seat surface 52 a is formed on the fixing member 52. The fixed seating surface 52a is formed on the lens holding frame 40 side. The pressing seat surface 40a and the fixed seating surface 52a have a plane orthogonal to the optical axis OA. For this reason, as shown in FIG.3 and FIG.4, the press seat surface 40a and the fixed seat surface 52a contact | abut mutually in parallel.

  Next, the configuration of the optical axis fixing mechanisms 70 </ b> A to 70 </ b> C will be described with reference to FIGS. 2 and 5 to 7. FIG. 5 is a schematic cross-sectional view showing the configuration of the eccentric pin 71 in the non-fixed state. FIG. 6 is a schematic cross-sectional view showing the configuration of the eccentric pin 71 in a fixed state. 5 and 6 are cross sections taken along a plane parallel to the optical axis OA, and show the same cross section on one side with the optical axis OA as the center. FIGS. 7A and 7B are schematic plan views when the eccentric pin 71 is viewed from the axial direction.

  As shown in FIG. 2, the optical axis fixing mechanisms 70A, 70B, and 70C are arranged at positions 120 degrees apart from each other in the circumferential direction with the optical axis OA as the center. That is, the eccentric pins 71 (described later) are arranged at three positions at equal intervals along the outer periphery of the lens holding frame 40 when viewed from the optical axis OA direction.

  In the present embodiment, the optical axis adjustment mechanism 60A is disposed in the vicinity of the optical axis fixing mechanism 70A. The optical axis adjusting mechanism 60B is disposed in the vicinity of the optical axis fixing mechanism 70B. That is, the alignment screw 61 of the optical axis adjustment mechanism 60A is disposed in the vicinity of the eccentric pin 71 of the optical axis fixing mechanism 70A. Further, the centering screw 61 of the optical axis adjusting mechanism 60B is disposed in the vicinity of the eccentric pin 71 of the optical axis fixing mechanism 70B. Since the optical axis fixing mechanisms 70A to 70C of the present embodiment have the same configuration, the optical axis fixing mechanism 70A will be described below as a representative.

  The optical axis fixing mechanism 70A includes an eccentric pin 71 as an eccentric member. The eccentric pin 71 is a member that fixes the lens holding frame 40 to the fixing member 52. The eccentric pin 71 is attached to the connecting member 50. A female screw 55 is formed on the connecting member. The female screw 55 is a screw hole for attaching the eccentric pin 71. The female screw 55 is formed so that the center line of the screw hole intersects the optical axis OA.

  The eccentric pin 71 is formed with a male screw 72, a driver groove 73, and an eccentric portion 74. The eccentric portion 74 is a portion that rotates together with the eccentric pin 71 and presses the lens holding frame 40.

  As shown in FIGS. 7A and 7B, the central axis C <b> 2 of the eccentric portion 74 is eccentric with respect to the central axis C <b> 1 of the eccentric pin 71 by a distance d. The eccentric pin 71 has a central axis C1 (axis line) that intersects the optical axis OA. The eccentric pin 71 is configured to be rotatable about the central axis C1. The eccentric pin 71 of the present embodiment is configured to have a substantially circular cross section in the radial direction.

  FIG. 7A shows the position of the eccentric portion 74 when the lens holding frame 40 is not fixed (corresponding to FIG. 5). FIG. 7B shows the position of the eccentric portion 74 in a state where the lens holding frame 40 is fixed (corresponding to FIG. 6).

  As shown in FIGS. 5 and 6, the eccentric pin 71 is used while being screwed into the female screw 55 of the fixing member 52. In the eccentric pin 71, the eccentric portion 74 can be rotated by engaging the tip of a driver (not shown) with the driver groove 73 and rotating it clockwise. For example, when the eccentric pin 71 is rotated 180 ° clockwise from the state shown in FIG. 7A, the eccentric portion 74 is positioned at the opposite side of 180 ° as shown in FIG. 7B. Move to.

  On the other hand, as shown in FIGS. 5 and 6, the lens holding frame 40 is formed with a notch 41. As shown in FIG. 2, the notch 41 is formed at a location where the eccentric pin 71 is disposed.

  The lens holding frame 40 has a pressing seat surface 41a. The pressing seat surface 41a is formed on the fixing member 52 side. On the other hand, a fixed seat surface 52 a is formed on the fixing member 52. The fixed seating surface 52a is formed on the lens holding frame 40 side. The pressing seat surface 41a and the fixed seating surface 52a have a plane orthogonal to the optical axis OA. For this reason, as shown in FIGS. 5 and 6, the pressing seat surface 41 a of the lens holding frame 40 and the fixed seat surface 52 a of the fixing member 52 abut against each other in parallel.

  The lens holding frame 40 has a pressed seat surface 41b. The pressed seat surface 41 b is a seat surface with which the eccentric portion 74 of the eccentric pin 71 abuts. The pressed seat surface 41b is formed on the opposite side of the pressed seat surface 41a, that is, on the lens mount 1M side. The pressed seat surface 41b has a plane orthogonal to the optical axis OA.

  The eccentric portion 74 of the eccentric pin 71 is not in contact with the pressed seat surface 41b of the lens holding frame 40 at the position shown in FIG. In this case, the eccentric portion 74 of the eccentric pin 71 is in a state where the lens holding frame 40 is not fixed to the fixing member 52 as shown in FIG.

  On the other hand, the eccentric portion 74 of the eccentric pin 71 is in contact with the pressed seat surface 41b of the lens holding frame 40 at the position shown in FIG. In this case, the eccentric portion 74 of the eccentric pin 71 is in a state of fixing the lens holding frame 40 to the fixing member 52 as shown in FIG. That is, the eccentric part 74 fixes the lens holding frame 40 to the fixing member 52 so as to sandwich the lens holding frame 40 with the fixing member 52 by rotating around the central axis C <b> 1.

  In addition, in a member (for example, the fixed cylinder 10 or the cam cylinder 20) located on the outer peripheral surface side of the lens holding frame 40, an adjustment for inserting the tip of the driver from the outside at a position corresponding to the eccentric pin 71 A hole (not shown) is formed.

  In the present embodiment, the alignment screw 61 of the optical axis adjustment mechanism 60A is disposed in the vicinity of the eccentric pin 71 of the optical axis fixing mechanism 70A. For this reason, a driver is inserted through a common adjustment hole between the alignment screw 61 of the optical axis adjustment mechanism 60A and the eccentric pin 71 of the optical axis fixing mechanism 70A. The alignment screw 61 of the optical axis adjustment mechanism 60B and the eccentric pin 71 of the optical axis fixing mechanism 70B are configured in the same manner. A dedicated adjustment hole is formed for the eccentric pin 71 of the optical axis fixing mechanism 70C.

  In the present embodiment, the lens holding frame 40, the connecting member 50, the pressing spring 62, the alignment screw 61, and the eccentric pin 71 described above constitute an optical device according to the present invention. In this embodiment, the lens barrel 1 provided with the optical device constitutes an optical apparatus according to the present invention.

  Next, an operation when the optical axis adjustment of the fourth lens unit L4 is performed by the optical axis adjustment mechanisms 60A and 60B will be described.

  When the optical axis of the fourth lens unit L4 is adjusted, the centering screws 61 of the optical axis adjustment mechanism 60A and the optical axis adjustment mechanism 60B are rotated clockwise or counterclockwise by a driver (not shown). Thereby, the alignment screw 61 moves in the direction of the optical axis OA or in the opposite direction.

  When the alignment screw 61 is moved in the direction of the optical axis OA, the alignment screw 61 presses the lens holding frame 40 in the direction of the optical axis OA. For this reason, the lens holding frame 40 moves toward the pressing spring 62 in a plane intersecting the optical axis OA. The lens holding frame 40 pressed by the alignment screw 61 is supported at the moved position by the urging force of the pressing spring 62.

  On the other hand, when the alignment screw 61 is moved in the direction opposite to the optical axis OA, the force with which the alignment screw 61 presses the lens holding frame 40 in the direction intersecting the optical axis OA is weakened. For this reason, the lens holding frame 40 moves to the alignment screw 61 side by the urging force of the pressing spring 62 in a plane intersecting the optical axis OA. The lens holding frame 40 moved to the alignment screw 61 side is supported at the moved position by the urging force of the pressing spring 62.

  The lens holding frame 40 is pressed in a direction intersecting the optical axis OA by the alignment screw 61. However, since the lens holding frame 40 is supported by the urging force of the pressing spring 62, the lens holding frame 40 is not deformed by the pressing of the alignment screw 61.

  Thus, the fourth lens group held by the lens holding frame 40 by moving the alignment screws 61 of the optical axis adjustment mechanism 60A and the optical axis adjustment mechanism 60B in the direction of the optical axis OA or in the opposite direction. The optical axis of L4 can be adjusted.

  When adjusting the optical axis of the fourth lens unit L4, the eccentric pins 71 (eccentric portions 74) of the optical axis fixing mechanisms 70A to 70C are moved to the positions shown in FIG. The holding frame 40 is not fixed to the fixing member 52.

  Next, an operation in the case where the position of the fourth lens unit L4 whose optical axis has been adjusted is fixed by the optical axis fixing mechanisms 70A to 70C will be described.

  When fixing the position of the fourth lens unit L4 adjusted for the optical axis, the eccentric pins 71 of the optical axis fixing mechanisms 70A to 70C are rotated 180 ° clockwise or counterclockwise by a driver (not shown). Rotate. That is, the eccentric portion 74 of the eccentric pin 71 is moved from the position shown in FIG. 5 (FIG. 7A) to the position shown in FIG. 6 (FIG. 7B). Accordingly, the eccentric portion 74 of the eccentric pin 71 contacts the pressed seat surface 41 b of the lens holding frame 40 and presses the lens holding frame 40 in the direction of the fixing member 52. As a result, the lens holding frame 40 holding the fourth lens unit L4 is fixed to the fixing member 52 at the position where the optical axis is adjusted.

According to 1st Embodiment mentioned above, there exist the following effects.
(1) The lens barrel 1 of the present embodiment has a central axis C1 (axis) in a plane intersecting the optical axis, and rotates around the central axis C1 to fix the lens holding frame 40 to a fixing member. An eccentric pin 71 is provided that is fixed to the fixing member 52 or is not fixed to the fixing member 52. For this reason, after adjusting the optical axis of the fourth lens unit L4, the eccentric pin 71 is rotated and the lens holding frame 40 is pressed in the direction of the fixing member 52, whereby the lens holding frame 40 is adjusted in the optical axis position. Can be fixed to the fixing member 52. According to this, since the lens holding frame 40 can be firmly fixed inside the lens barrel 1, the position of the lens holding frame 40 can be maintained even if an external force such as vibration or impact acts on the lens barrel 1. It is possible to reliably prevent the displacement. Thus, according to the lens barrel 1 of the present embodiment, the optical axis can be fixed at an accurate position, so that good optical characteristics can be obtained.

(2) In the lens barrel 1 of the present embodiment, the alignment screw 61 and the eccentric pin 71 can be rotated by a driver or the like from the direction intersecting the optical axis OA. Therefore, the optical axis adjustment and optical axis fixing operations can be performed in a short time and easily.

  Incidentally, there are known lens barrels that fix the lens holding frame by screwing it in the direction of the optical axis (direction parallel to the optical axis) (for example, JP 2006-58582 A, JP 2000-66076 A). etc). In these lens barrels, after the optical axis is adjusted by the optical adjusting device, the lens barrel is once removed from the optical adjusting device, and the lens holding frame is fixed with screws. After that, it is necessary to check the optical performance by attaching the lens barrel to the optical adjusting device again. As described above, in the lens barrel in which the lens holding frame is fixed by screwing in the optical axis direction, the lens barrel must be attached to the optical adjustment device every time the optical axis is adjusted or the lens holding frame is fixed. Don't be.

  However, in the lens barrel 1 of the present embodiment, after the optical axis is adjusted by the optical adjustment device, the operation of fixing the lens holding frame 40 can be performed without removing the lens barrel 1 from the optical adjustment device. . Therefore, the lens barrel 1 of the present embodiment is excellent in workability when the lens holding frame 40 is assembled inside the lens barrel 1.

  Similarly to the present embodiment, a lens barrel is known in which a lens holding frame is fixed by screwing from a direction intersecting the optical axis (a radial direction of the lens). With this lens barrel, the optical axis can be adjusted and the lens holding frame can be fixed while the lens barrel is still attached to the optical adjusting device. However, if the lens holding frame is fixed by screwing in a direction crossing the optical axis, the lens holding frame may be deformed and the optical axis may be displaced. In this case, it is necessary to release the lens holding frame again and adjust the optical axis. As described above, in the lens barrel in which the lens holding frame is fixed by screwing from the direction intersecting the optical axis, it is necessary to alternately repeat the fixing of the lens holding frame and the adjustment of the optical axis. For this reason, it takes time to adjust the optical axis, and it is difficult to adjust the optical axis with high accuracy.

  However, since the lens holding frame 40 is pressed and fixed in the direction of the optical axis OA in the lens barrel 1 of the present embodiment, the lens holding frame 40 is not deformed. Therefore, the lens barrel 1 of the present embodiment can perform the optical axis adjustment in a short time, and can perform the optical axis adjustment with high accuracy.

(3) In the lens barrel 1 of the present embodiment, the connecting member 50 includes a fixing member 52 that restricts movement of the lens holding frame 40 in the direction of the optical axis OA. The eccentric pin 71 rotates about a central axis C1 (axis line) that intersects the optical axis OA so that the lens holding frame 40 is sandwiched between the eccentric pin 71 and the fixing member 52. Therefore, the lens holding frame 40 can be securely fixed by a simple operation of rotating the eccentric pin 71 clockwise or counterclockwise.

(4) In the lens barrel 1 of the present embodiment, the eccentric pins 71 are arranged at three locations at equal intervals along the outer periphery of the lens holding frame 40 when viewed from the direction of the optical axis OA. Therefore, the outer periphery of the lens holding frame 40 can be evenly pressed by the minimum necessary eccentric pins 71. Therefore, the lens holding frame 40 can be securely fixed with the minimum necessary eccentric pins 71. In addition, the displacement of the lens holding frame 40 can be suppressed over a long period of time.

(5) In the lens barrel 1 of the present embodiment, the alignment screw 61 of the optical axis adjustment mechanism 60A is disposed in the vicinity of the eccentric pin 71 of the optical axis fixing mechanism 70A. Further, the centering screw 61 of the optical axis adjusting mechanism 60B is disposed in the vicinity of the eccentric pin 71 of the optical axis fixing mechanism 70B. For this reason, an adjustment tool such as a driver can be inserted into the lens barrel 1 from the same position. Therefore, the optical axis adjustment and the lens holding frame 40 can be efficiently fixed.

  Further, the number of adjustment holes for inserting the tip of a driver or the like can be reduced. For this reason, there is little influence on the position of the cam groove formed in the cam cylinder 20, and the design of the cam groove can be given flexibility. Moreover, since the number of adjustment holes can be reduced, the strength of the lens barrel 1 can be increased.

Second Embodiment
Next, a second embodiment of the present invention will be described. In the second embodiment, the same parts as those in the first embodiment will be described with the same reference numerals. Also, only the configuration characteristic of the second embodiment will be described, and description of the common configuration will be omitted.

  FIG. 8 is a schematic cross-sectional view showing the configuration of the optical axis fixing mechanism 70D in the second embodiment. A pressing spring support portion 56 is provided on the connecting member 50A of the present embodiment. The pressing spring support 56 is provided at the end of the connecting member 50A on the lens mount 1M side.

  A first recess 57 is formed in the pressing spring support portion 56. The first recess 57 is a groove into which one side of a pressing spring 69 (described later) is fitted. On the other hand, a second recess 42 is formed in the lens holding frame 40A. The second recess 42 is a groove into which the other side of the pressing spring 69 is fitted. The first recess 57 and the second recess 42 are arranged at positions facing each other along the optical axis OA.

  The pressing spring 69 is an elastic member that biases the lens holding frame 40 toward the fixing member 52. The pressing spring 69 is a compression (coil) spring that generates a biasing force in a direction opposite to the pressed direction. The pressing spring 69 is disposed between the first recess 57 and the second recess 42. The lens holding frame 40 is urged toward the fixing member 52 by the urging force of the pressing spring 69.

  As with the eccentric pin 71, the pressing spring 69 is disposed at a position 120 ° apart from the optical axis OA in the circumferential direction (not shown). The pressing spring 69 is provided in the vicinity of the eccentric pin 71.

  The lens holding frame 40 </ b> A of this embodiment is urged toward the fixing member 52 by the urging force of the pressing spring 69. Thereby, the pressing seat surface 41a of the lens holding frame 40A and the fixed seat surface 52a of the fixing member 52 can be always maintained in contact with each other.

  According to 2nd Embodiment mentioned above, in addition to the effect of 1st Embodiment, there exist the following effects.

(6) The lens holding frame 40 </ b> A of this embodiment is urged toward the fixing member 52 by the urging force of the pressing spring 69. For this reason, it is possible to prevent the lens holding frame 40 from falling in the direction of the optical axis OA when the eccentric pin 71 does not fix the lens holding frame 40. Therefore, the optical axis can be adjusted with higher accuracy.

  During the optical axis adjustment, the lens holding frame 40A moves in a plane that intersects the optical axis OA. On the other hand, the pressing spring 69 is bent and deformed in the moving direction of the lens holding frame 40A. For this reason, the pressing spring 69 does not hinder the movement of the lens holding frame 40A during the optical axis adjustment.

(Deformation)
Without being limited to the embodiment described above, the present invention can be variously modified and changed as described below, and these are also within the scope of the present invention.

  In the first and second embodiments, the two optical axis adjustment mechanisms 60A and 60B are arranged at positions 90 ° apart from each other in the circumferential direction around the optical axis OA. However, the present invention is not limited to this, and the three optical axis adjustment mechanisms may be arranged at positions 120 ° apart from each other in the circumferential direction with the optical axis OA as the center. Furthermore, it is good also as a structure which has arrange | positioned four or more optical axis adjustment mechanisms at equal intervals in the circumferential direction.

  In the first and second embodiments, the three optical axis fixing mechanisms 70 </ b> A to 70 </ b> C are disposed at positions 120 ° apart from each other in the circumferential direction with the optical axis OA as the center. However, the configuration is not limited to this, and the four optical axis fixing mechanisms may be arranged at positions 90 ° apart from each other in the circumferential direction with the optical axis OA as the center. Furthermore, it is good also as a structure which has arrange | positioned five or more optical axis fixing mechanisms at equal intervals in the circumferential direction.

  In the first and second embodiments, the eccentric portion 74 of the eccentric pin 71 is configured to have a substantially circular cross section in the radial direction. However, the cross section in the radial direction may be oval or cam-shaped.

  In the first and second embodiments, the example in which the optical axis adjustment mechanisms 60A and 60B and the optical axis fixing mechanisms 70A to 70C are applied to the lens holding frame 40 that holds the fourth lens unit L4 has been described. However, the configuration is not limited to this, and the optical axis adjustment mechanisms 60A and 60B and the optical axis fixing mechanisms 70A to 70C may be applied to a lens holding frame that holds other lens groups.

  In the second embodiment, the pressing spring 69 is disposed at a position 120 ° apart from the optical axis OA in the circumferential direction. Not limited to this, the four pressing springs 69 and the optical axis OA are arranged at positions 90 ° apart from each other in the circumferential direction. Furthermore, it is good also as a structure which has arrange | positioned five or more press springs 69 at equal intervals in the circumferential direction.

  In the first and second embodiments, the example in which the optical device according to the present invention is configured as a lens barrel has been described. The optical apparatus according to the present invention is not limited to this, and may be configured as, for example, a lens-integrated still camera, video camera, telescope, microscope, or the like.

  Moreover, although the said embodiment and modification can be used in combination suitably, since the structure of each embodiment is clear by illustration and description, detailed description is abbreviate | omitted. Furthermore, the present invention is not limited by the embodiment described above.

  1: lens barrel, 10: fixed tube, 20: cam tube, 30: outer tube, 40, 40A: lens holding frame, 50, 50A: connecting member, 52: fixed member, 60A, 60B: optical axis adjusting mechanism, 61: Alignment screw, 69: Pressing spring, 70A, 70B, 70C, 70D: Optical axis fixing mechanism, 71: Eccentric pin, 74: Eccentric part

Claims (6)

A first holding frame for holding the optical system;
A second holding frame for holding the first holding frame;
An elastic body disposed between the first holding frame and the second holding frame in a direction intersecting the optical axis of the optical system;
An alignment member that is disposed so as to sandwich the first holding frame between the elastic body in a direction intersecting the optical axis, and presses the first holding frame toward the elastic body;
The first holding frame is fixed to the second holding frame or the first holding frame is fixed to the second holding frame by rotating around the axis having an axis in a direction intersecting the optical axis. An eccentric member that is not fixed to the holding frame;
An optical device comprising: The optical device according to claim 1.
The second holding frame includes a fixing member that restricts movement of the first holding frame in the direction of the optical axis,
The eccentric member rotates about an axis intersecting the optical axis so as to sandwich the first holding frame between the fixing member and the fixing member;
An optical device characterized by the above. The optical device according to claim 1 or 2,
A biasing member that biases the first holding frame in the direction of the optical axis;
An optical device characterized by the above. In the optical device according to any one of claims 1 to 3,
The eccentric members are arranged at three locations at equal intervals along the outer periphery of the first holding frame when viewed from the direction of the optical axis.
An optical device characterized by the above. In the optical device according to any one of claims 1 to 4,
The alignment member is disposed in the vicinity of the eccentric member;
An optical device characterized by the above.   An optical apparatus comprising the optical device according to claim 1.

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