JP5776179B2 - Alignment mechanism, lens barrel and optical equipment - Google Patents

Description

  The present invention relates to an alignment mechanism for performing relative position adjustment in a direction orthogonal to the optical axis of an optical element such as a lens, a lens barrel including such an alignment mechanism, and such a lens barrel. The present invention relates to an optical device provided.

  Conventionally, zooming and focusing are performed by moving a zoom (variator) lens and a focusing lens among a plurality of lenses arranged in a lens barrel in the optical axis direction. There is a so-called inner focus type zoom lens.

  Such an inner focus type zoom lens does not change the overall length due to focusing, and can be reduced in size and weight. For example, an optical device such as an imaging device such as a digital video camera or a digital still camera, or an image projection device such as a projector. Widely used in equipment.

  By the way, in a zoom lens, when a part of a plurality of lenses arranged in a lens barrel is held by a lens holding member and this lens holding member is incorporated in the lens barrel, the optical axis of the lens is shifted. Some have a lens alignment mechanism that performs relative position adjustment in a direction orthogonal to the optical axis of the lens holding member so that adjustment (referred to as alignment) can be performed (see Patent Documents 1 and 2). .

  For example, in the lens alignment mechanism described in Patent Document 1 below, in an interchangeable lens for a single lens reflex camera, the lens holding member is pressed and held with a sheet metal that also serves to prevent deformation of the lens barrel. The optical axis deviation of the optical element held by the lens holding member is adjusted while being moved by the adjustment jig while being moved in a direction perpendicular to the optical axis. However, in this configuration, when the adjustment jig is removed after the adjustment, there is a defect that the lens holding member moves in a direction in which the stress applied to the lens holding member is relaxed.

  On the other hand, in the lens alignment mechanism described in Patent Document 2 below, in the interchangeable lens for a single-lens reflex camera, the lens holding member is pressed and held with a sheet metal that also serves to prevent deformation of the lens barrel, and a rotation axis orthogonal to the optical axis. The optical axis shift of the optical element held by the lens holding member is adjusted by moving the lens holding member in a direction orthogonal to the optical axis by the eccentric member that rotates about the axis. However, in the case of this configuration, although the optical axis shift of the optical element can be adjusted with high accuracy, the adjustment work is complicated because the number of adjustment points is three.

Japanese Patent No. 3789875 Japanese Patent Laid-Open No. 2002-196205

  The present invention has been proposed in view of such a conventional situation, and with a simple configuration, an alignment mechanism that can accurately adjust the optical axis deviation of an optical element and can easily perform an alignment operation, It is another object of the present invention to provide a lens barrel having such an alignment mechanism and an optical apparatus having such a lens barrel.

In order to achieve the above-described object, an alignment mechanism according to the present invention includes a cylindrical portion that holds an optical element, a flange portion that protrudes outward from the cylindrical portion, and a plurality of flange portions that are formed on the flange portion. A holding member having a through-hole, an opening for facing the optical element outward, and a plurality of screw holes on the outside of the opening, are arranged to face the holding member, and face the holding member Inside the hole including a support member that supports the first direction and the second direction that are orthogonal to each other in a plane, and a pair of parallel parts that are parallel to the second direction. And a flange portion protruding outward from the frame portion, and a plurality of through holes formed in the flange portion, passing through the optical axis of the optical element on the surface facing the support member first fulcrum provided in a position on a line parallel to the second direction A first rotating member that is rotatably supported around a frame portion for fitting an inner hole portion including a pair of parallel portions parallel to each other with respect to the first direction a tubular portion, A flange portion protruding outward from the frame portion and a plurality of through holes formed in the flange portion, and parallel to the first direction passing through the optical axis of the optical element on the surface facing the support member and a second rotating member that is rotatably supported about a second fulcrum provided in a position on a line, the holding member, the first rotating member and second rotating member Has a structure attached to the support member by fastening screws having a diameter smaller than those through holes to the screw holes through the through holes of the flange portions overlapped with each other, and the first rotating member is And a shaft hole or shaft portion that is engaged with the shaft portion or shaft hole located at the first fulcrum of the support member. By Rukoto, while being supported rotatably about a first fulcrum, a cylindrical portion movably held in the direction along the pair of parallel portions inside the hole of the frame portion, the second The rotating member has a shaft hole or a shaft portion that is engaged with the shaft portion or the shaft hole that is positioned at the second fulcrum of the support member, and is thus supported rotatably about the second fulcrum. The cylindrical portion is held inside the hole portion of the frame portion so as to be movable in a direction along the pair of parallel portions, and can be rotated by any one of the first rotating member and the second rotating member. Accordingly, the holding member moves in one of the first direction and the second direction with respect to the support member, thereby performing relative position adjustment in the direction orthogonal to the optical axis of the optical element. It is characterized by that.

  As described above, in the aligning mechanism according to the present invention, the holding member moves within the surface of the support member that is opposed to the first rotation member and the second rotation member. With a simple configuration that moves, relative position adjustment in a direction orthogonal to the optical axis of the optical element can be performed with high accuracy. Further, such alignment work can be easily performed.

  Therefore, according to the present invention, it is possible to provide a lens barrel having such an alignment mechanism and an optical apparatus having such a lens barrel.

FIG. 1 is a cross-sectional view showing the internal structure of an interchangeable lens to which the present invention is applied. FIG. 2 is a perspective view showing an appearance of a lens alignment mechanism provided in the interchangeable lens shown in FIG. 3 is a cross-sectional view of the lens alignment mechanism shown in FIG. FIG. 4 is an exploded perspective view of the lens alignment mechanism shown in FIG. 2 as viewed from one side. FIG. 5 is an exploded perspective view of the lens alignment mechanism shown in FIG. 2 as viewed from the other side.

Hereinafter, an alignment mechanism, a lens barrel, and an optical apparatus to which the present invention is applied will be described in detail with reference to the drawings.
In the present embodiment, for example, the case where the present invention is applied to an interchangeable lens (optical apparatus) 1 for a single-lens reflex camera shown in FIG. 1 will be described. FIG. 1 is a cross-sectional view showing the internal structure of the interchangeable lens 1.

  As shown in FIG. 1, the interchangeable lens 1 includes a lens barrel 2 in which a plurality (15 in this example) of lenses L1 to L15 are arranged side by side in the optical axis direction. The plurality of lenses L1 to L15 constitute an inner focus type zoom lens.

  Specifically, this zoom lens includes, in order from the object side (the front side of the interchangeable lens 1), a first lens group G1 including lenses L1, L2, and L3, and a second lens including lenses L4, L5, L6, and L7. A third lens group G3 composed of a group G2, a lens L8, a fourth lens group G4 composed of a lens L9, a fifth lens group G5 composed of lenses L10 and L11, and a first lens group composed of lenses L12, L13, L14 and L15. It has a 6-group lens configuration with 6-lens group G6. An aperture stop SP is disposed between the third lens group G3 and the fourth lens group G4.

  In this zoom lens, zooming is performed by moving the remaining second to sixth lens groups G2 to G6 in the optical axis direction with respect to the fixed first lens group G1, and the fourth lens. Focusing is performed by moving the group G4 in the optical axis direction.

  In addition, this zoom lens can correct image blur caused by camera shake or the like by moving the fifth lens group G5 in a direction orthogonal to the optical axis. The configuration of the zoom lens is not limited to the configuration of the 15 lenses in the 6 groups described above, and can be implemented by appropriately changing the number and combination of the lenses.

  Since the lens barrel 2 constitutes such a zoom lens, a first lens holding member 3 that holds the first lens group G1, a second lens holding member 4 that holds the second lens group G2, and A third lens holding member 5 that holds the third lens group G3, a fourth lens holding member 6 that holds the fourth lens group G4, and a fifth lens holding member 7 that holds the fifth lens group G5 The sixth lens holding member 8 that holds the sixth lens group G6 and the second to sixth lens holding members 4 to 8 out of the first to sixth lens holding members 3 to 8 are housed inside. And a cam cylinder 10 that is rotatably attached to the outer peripheral portion of the fixed cylinder 9 in the circumferential direction in a state in which the fixed cylinder 9 is housed inside.

  The first lens holding member 3 is formed in a cylindrical shape as a whole, and is attached to the front side of the fixed cylinder 9 with the first lens group G1 held inside.

  The second lens holding member 4 has a holding frame 4 a that holds the second lens group G <b> 2 inside, and is housed in a state that is movable in the axial direction in the fixed cylinder 9. A plurality (three in this example) of guide pins are provided along the circumferential direction on the outer peripheral portion of the holding frame 4a.

  The third lens holding member 5 has a holding frame 5a that holds the third lens group G3 on the inside, and is integrally attached to the front side of the fourth lens holding member 6 (a holding cylinder 13 to be described later). ing. An iris unit (aperture adjustment mechanism) 11 for adjusting the aperture of the aperture stop SP is attached to the back side of the third lens holding member 5.

  The fourth lens holding member 6 includes a holding frame 12 that holds the fourth lens group G4 on the inner side, a holding cylinder 13 that stores the holding frame 12 on the inner side, and the holding frame 12 in the holding cylinder 13 that has an optical axis. A focus actuator unit (lens drive mechanism) 14 composed of a voice coil motor (VCM) or the like for driving the displacement in the direction, and the holding cylinder 13 is movable in the axial direction within the fixed cylinder 9. It is stored. A plurality (three in this example) of guide pins are provided in the circumferential direction on the outer peripheral portion of the holding cylinder 13.

  The fifth lens holding member 7 includes a holding frame 15 that holds the fifth lens group G5 inside, a support frame 16 that supports the holding frame 15 so as to be movable within a plane orthogonal to the optical axis, and the support frame. 16 includes a vibration-proof actuator unit (image blur correction mechanism) 17 including a piezo element (PZT) or the like for driving the holding frame 15 in a direction perpendicular to the optical axis. The fifth lens holding member 7 is integrally attached to the back side of the fourth lens holding member 6 (holding cylinder 13).

  The sixth lens holding member 8 includes a holding frame 18 that holds the sixth lens group G6 inside, a support frame 19 that supports the holding frame 18 so as to be movable in a plane orthogonal to the optical axis, and the support frame. And a lens alignment mechanism 20 that adjusts the relative position of the holding frame 18 in the direction orthogonal to the optical axis of the holding frame 19, and the support frame 19 is movable in the axial direction within the fixed cylinder 9. It is stored. A plurality (three in this example) of guide pins are provided on the outer periphery of the support frame 19 side by side in the circumferential direction.

  The fixed cylinder 9 is formed in a substantially cylindrical shape as a whole, and supports the second to sixth lens holding members 4 to 8 accommodated therein so as to be movable in the optical axis direction. Specifically, the fixed cylinder 9 is provided with a plurality of (three in this example) linear guide slits extending in parallel in the optical axis direction. And the fixed cylinder 9 is engaged with the guide pins protruding from the outer peripheral portions of the second to sixth lens holding members 4 to 8 to these guide slits, whereby the second to sixth lens holdings are held. The members 4 to 8 are supported so as to be movable in the optical axis direction.

  The cam cylinder 10 is formed in a substantially cylindrical shape as a whole, and is attached to the outer peripheral portion of the fixed cylinder 9 housed inside thereof so as to be rotatable in the circumferential direction. Specifically, the cam cylinder 10 has curved cam slits (not shown) corresponding to the movement trajectories of the second to sixth lens groups G2 to G6, and the second to sixth lens holding members. For each of the guide pins of the members 4 to 8, a plurality (three in this example) are provided in the circumferential direction. The cam cylinder 10 is a fixed cylinder in a state where the guide pins of the second to sixth lens holding members 4 to 8 protruding from the guide slits of the fixed cylinder 9 are engaged with these cam slits. 9 is rotatably attached to the outer peripheral portion in the circumferential direction.

  In the lens barrel 2 having the above-described structure, the second to sixth lens holding members are moved while the guide pins relatively move in the guide slits and the cam slits by the rotation operation of the cam barrel 10. 4 to 8 move in the direction of the optical axis in the fixed cylinder 9 while drawing a locus matched to the shape of each cam slit.

  The interchangeable lens 1 includes a mechanism for manually or automatically focusing, a mechanism for detecting camera shake, a mechanism for mounting on a single-lens reflex camera, and other known parts on the lens barrel 2. It is configured by attaching.

  In the interchangeable lens 1, the second to sixth lens groups G <b> 2 to G <b> 6 are moved in the optical axis direction by rotating the cam barrel 10 of the lens barrel 2 in a state where the interchangeable lens 1 is attached to the single-lens reflex camera. Zooming can be performed. Further, focusing can be performed by moving the fourth lens group G4 in the optical axis direction during zooming. Furthermore, in this interchangeable lens 1, image blur caused by camera shake or the like can be canceled (cancelled) by moving the fifth lens group G5 in a direction orthogonal to the optical axis.

  Incidentally, the lens alignment mechanism 20 is constituted by an alignment mechanism to which the present invention is applied. Hereinafter, the lens alignment mechanism 20 to which the present invention is applied will be described with reference to FIGS. 2 is a perspective view showing the appearance of the lens alignment mechanism 20, FIG. 3 is a cross-sectional view of the lens alignment mechanism 20, and FIG. 4 shows the lens alignment mechanism 20 on one side (left side in the figure). FIG. 5 is an exploded perspective view of the lens alignment mechanism 20 viewed from the other side (right side in the drawing).

  As shown in FIGS. 2 to 5, the lens alignment mechanism 20 is disposed so as to be opposed to the holding frame (holding member) 18 that holds the sixth lens group G <b> 6 (optical element) and the holding frame 18. A support frame (support member) 19 that supports the holding frame 18 so as to be movable in an opposing surface, and is arranged to face the support frame 19 so as to face the support frame 19 while holding the holding frame 18. The first rotation plate (first rotation member) 21 that is rotatably supported around the first fulcrum S1 provided on the surface to be supported and the support frame 19 are disposed and held. A second rotating plate (second rotating member) 22 that is rotatably supported around a second fulcrum S2 provided on a surface facing the support frame 19 while holding the frame 18; It has.

  The holding frame 18 includes a cylindrical portion 23 that holds the sixth lens group G6 on the inside, and a flange portion 24 that protrudes outward from the outer peripheral portion of the cylindrical portion 23 that faces the support frame 19. And a plurality of (three in this example) through-holes 25 formed in the flange portion 24.

  The support frame 19 includes an opening 26 that faces the sixth lens group G6 outward, a plurality (three in this example) of screw holes 27 outside the opening 26, the first fulcrum S1, and the first fulcrum S1. The first shaft portion 28a and the second shaft portion 28b are provided at positions corresponding to the second fulcrum S2.

  The first rotating plate 21 and the second rotating plate 22 include a frame portion 29 that holds the cylindrical portion 23 of the holding frame 19 inside, and a flange portion 30 that protrudes outward from the frame portion 29. And a plurality of through holes 31 formed in the flange portion 30, and a first shaft hole 32a and a second shaft hole 32b.

  In the lens alignment mechanism 20, the flange portion 24 is brought into contact with the opposing surface of the support frame 19 with the cylindrical portion 23 of the holding frame 18 positioned inside the opening 26 of the support frame 19. Thus, the support frame 19 is attached so as to be movable in the opposing surface.

  In addition, the first rotating plate 21 has the cylindrical portion 23 of the holding frame 18 fitted in the vertical parallel portion of the frame portion 29, and the holding frame 18 and the flange portions 24 and 30 are overlapped with each other. By engaging the first shaft portion 28a of the support frame 19 with the first shaft hole 32a, the first shaft hole 32a is attached to the opposing surface of the support frame 19 so as to be rotatable about the first fulcrum S1.

  The second rotating plate 22 has the cylindrical portion 23 of the holding frame 18 fitted to the horizontal parallel portion of the frame portion 29 and the first rotating plate 21 and the flange portions 30 and 30 are overlapped with each other. In this state, by engaging the second shaft portion 28b of the support frame 19 with the second shaft hole 32b, the second shaft hole 28b is attached to the opposite surface of the support frame 19 so as to be rotatable about the second fulcrum S2. ing.

  Further, the first fulcrum S1 and the second fulcrum S2 are arranged at a right angle (90 °) across the optical axis of the sixth lens group G6. Specifically, the first fulcrum S1 is located on a vertical line passing through the optical axis of the sixth lens group G6, and in this example, the lower side sandwiching the optical axis of the sixth lens group G6 shown in FIG. Is arranged. Thereby, in the lens alignment mechanism 20, the holding frame 18 (that is, the above-described above) held by the first rotating plate 21 is obtained by rotating the first rotating plate 21 around the first fulcrum S1. The sixth lens group G6) can be moved in the yawing direction (first direction) that swings to the left and right within the plane facing the support frame 19.

  On the other hand, the second fulcrum S2 is located on a horizontal line passing through the optical axis of the sixth lens group G6, and in this example, is located on the right side of the optical axis of the sixth lens group G6 shown in FIG. ing. As a result, in the lens alignment mechanism 20, the second rotating plate 22 rotates about the first fulcrum S2, so that the holding frame 18 held by the second rotating plate 22 (that is, the above-described frame). The sixth lens group G6) can be moved in a pitching direction (second direction) that swings up and down in a plane facing the support frame 19.

  In addition, the lens alignment mechanism 20 includes flange portions 24, 30, and 30 that are superposed on each other as a fixing unit that fixes the holding frame 18, the first rotation plate 21, and the second rotation plate 22 to the support frame 19. The holding frame 18, the first rotation plate 21, and the second frame 22 are fastened to the screw holes 27 by fastening screws 33 having a diameter smaller than those through holes 25, 31, and 31. The rotating plate 22 is fixed to the support frame 19.

  Further, the lens aligning mechanism 20 has a screw hole 27 as urging means for urging the holding frame 18, the first rotating plate 21, and the second rotating plate 22 toward the surface facing the support frame 19. A structure in which the holding frame 18, the first rotating plate 21, and the second rotating plate 22 are urged toward the support frame 19 by interposing a spring washer 34 between the screw 33 and the screw 33. Have.

  In the lens alignment mechanism 20, the holding frame 18 that moves in the opposing surface of the support frame 19 in accordance with the rotation operation of the first rotation plate 21 and the second rotation plate 22 is a spring. The fastening force of the screw 33 with respect to the screw hole 27 is adjusted to such an extent that the position in the optical axis direction can be held by the urging force of the washer 34. That is, the holding frame 18, the first rotation plate 21, and the second rotation plate 22 are attached to the support frame 19 in a semi-fixed state at least before adjustment.

  In the lens alignment mechanism 20, the screw 33 is loosely fitted in the through holes 31 of the first rotating plate 21 and the second rotating plate 22. Thus, the first rotating plate 21 and the second rotating plate 22 are rotatable within a range in which the screw 33 moves relatively.

  In addition, the lens alignment mechanism 20 includes an adjustment mechanism (adjustment unit) 35 that adjusts the position of the first rotation plate 21 and the second rotation plate 22 in the rotation direction. Specifically, the adjustment mechanism 35 includes a pair of adjustment members 36 a and 36 b that are rotatably attached to the outer peripheral portion of the support frame 19. The pair of adjusting members 36a and 36b includes an eccentric screw (eccentric pin) 37 having an eccentric portion 37a that is eccentric with respect to the central axis, and an engaging member 38 having a long hole 38a through which the eccentric screw 37 passes. Has been.

  One adjusting member 36a is opposite to the first fulcrum S1 of the first rotating plate 21 on the opposite side of the optical axis of the sixth lens group G6 (the first rotating plate shown in FIG. 2). In the state where the engaging member 38 is engaged with the concave portion 39a provided on the outer peripheral portion of 21), the eccentric screw 37 is screwed into the screw hole of the protruding portion 40a provided on the support frame 19. Yes. The other adjustment member 36b is opposite to the first fulcrum S2 of the second rotation plate 22 across the optical axis of the sixth lens group G6 ((second rotation shown in FIG. 2). The eccentric screw 37 is attached to the screw hole of the protruding portion 40b provided on the support frame 19 by screwing in a state where the engaging member 38 is engaged with the concave portion 39b provided on the outer peripheral portion of the right side of the plate 22. ing.

  In the adjusting mechanism 35, when the eccentric screw 37 of the pair of adjusting members 36a and 36b is rotated, the eccentric portion 37a of the eccentric screw 37 relatively moves in the elongated hole 38a of the engaging member 38. The position of the engaging member 38 on the protrusion 40b is switched. Thereby, since the 1st rotation board 21 and the 2nd rotation board 22 rotate by the movement of the engaging member 38 engaged with the recessed parts 39a and 39b, the position of the rotation direction can be adjusted. It has become.

  In the lens alignment mechanism 20 having the above-described structure, the holding frame 18 faces the support frame 19 in accordance with any rotation operation of the first rotation plate 21 and the second rotation plate 22. The relative position adjustment in the direction orthogonal to the optical axis of the sixth lens group G6 can be performed with high accuracy by a simple configuration that moves in the plane to be moved.

  In the lens alignment mechanism 20, the alignment operation for adjusting the optical axis deviation of the sixth lens group G6 is easily performed by rotating the eccentric screw 37 of the pair of adjustment members 36a and 36b described above. Is possible. In particular, even after being incorporated in the lens barrel 2, the pair of adjusting members 36a and 36b described above are passed through an adjusting jig from openings (not shown) provided in the fixed cylinder 9 and the cam cylinder 10. It is possible to easily adjust the optical axis deviation of the sixth lens group G6 while rotating the eccentric screw 37. Further, when the adjustment work is performed while viewing the chart image taken through the zoom lens of the lens barrel 2 on the monitor, the above-described pair of adjustment members 36a and 36b are not reflected on the image. The eccentric screw 37 can be rotated.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, the lens alignment mechanism 20 has a configuration in which shaft portions 28a and 28b are provided on the support frame 19 side and shaft holes 32a and 32b are provided on the first and second rotating plates 21 and 22 side. It is also possible to adopt a configuration in which shaft holes 32a and 32b are provided on the support frame 19 side, and shaft portions 28a and 28b are provided on the first and second rotating plates 21 and 22 side.

  The lens alignment mechanism 20 has a configuration in which the adjustment members 36a and 36b are provided on the support frame 19 side, and the recesses 39a and 39b are provided on the first and second rotary plates 21 and 22 side. It is also possible to adopt a configuration in which the recesses 39a and 39b are provided on the frame 19 side, and the adjustment members 36a and 36b are provided on the first and second rotating plates 21 and 22 side.

  The lens alignment mechanism 20 is configured to perform alignment while rotating the eccentric screws 37 of the pair of adjustment members 36a and 36b described above. It is not limited, and other mechanisms can be used as long as the mechanism can adjust the position of the first rotating plate 21 and the second rotating plate 22 in the rotating direction. Further, the adjusting mechanism 35 is omitted, and the above-described alignment operation is performed while the first rotating plate 21 and the second rotating plate 22 are directly rotated using a jig or the like. Is also possible.

  In the above-described embodiment, the case where the alignment mechanism of the present invention is applied to the lens alignment mechanism 20 provided on the sixth lens holding member 8 has been described. The present invention can be applied when adjusting the optical axis shift of any one of the plurality of lenses L1 to L15 constituting the lens or the lens group. In addition, the alignment mechanism of the present invention is not limited to the lens described above, and can also be applied when adjusting the optical axis deviation of an optical element such as an optical filter.

  Furthermore, in the above embodiment, the case where the present invention is applied to the interchangeable lens 1 used in a single-lens reflex film camera has been described. However, the present invention is not limited to a photographing apparatus such as a lens shutter camera, a digital still camera, or a video camera, or a projector. The present invention can be widely applied to an optical apparatus such as an image projection apparatus, and a lens barrel included in such an optical apparatus.

  DESCRIPTION OF SYMBOLS 1 ... Interchangeable lens (optical apparatus) 2 ... Lens barrel 3 ... 1st lens holding member 4 ... 2nd lens holding member 5 ... 3rd lens holding member 6 ... 4th lens holding member 7 ... 5th Lens holding member 8 ... Sixth lens holding member 9 ... Fixed cylinder 10 ... Cam cylinder 11 ... Iris unit (aperture adjustment mechanism) 12 ... Holding frame 13 ... Holding cylinder 14 ... Focus actuator unit (lens driving mechanism) 15 ... Holding frame DESCRIPTION OF SYMBOLS 16 ... Support frame 17 ... Anti-vibration actuator unit (image blur correction mechanism) 18 ... Holding frame (holding member) 19 ... Support frame (support member) 20 ... Lens alignment mechanism 21 ... 1st rotation board (1st Rotating member) 22 ... second rotating plate (second rotating member) 23 ... cylindrical portion 24 ... flange portion 25 ... through hole 26 ... opening portion 27 ... screw hole 28a, 28b ... shaft portion 29 ... Part 30 ... Flange part 31 ... Through hole 32a, 32b ... Shaft hole 33 ... Screw (fixing means) 34 ... Spring washer (biasing means) 35 ... Adjustment mechanism (adjustment means) 36a, 36b ... Adjustment member 37 ... Eccentric screw ( Eccentric pin) 37a ... Eccentric part 38 ... Engaging member 38a ... Slots 39a and 39b ... Recessed parts 40a and 40b ... Projecting part S1 ... First fulcrum S2 ... Second fulcrum L1 to L15 ... Lenses G1 to G6 ... First -6th lens group SP ... Aperture

Claims (10)

A holding member having a cylindrical portion that holds the optical element, a flange portion that protrudes outward from the cylindrical portion, and a plurality of through holes formed in the flange portion;
The optical element has an opening facing the outside and a plurality of screw holes on the outside of the opening. The opening is arranged to face the holding member and is orthogonal to each other in a plane facing the holding member. A support member that is movably supported in a first direction and a second direction;
A frame portion for fitting the cylindrical portion with the inside of a hole including a pair of parallel portions that are parallel to each other in the second direction, a flange portion that protrudes outward from the frame portion, includes a plurality of through-holes formed in the flange portion, provided in a position on a line parallel to said second direction in said supporting member which faces passing through the optical axis of the optical element A first rotating member supported rotatably about a first fulcrum;
A frame portion for fitting the cylindrical portion with the inside of a hole including a pair of parallel portions that are parallel to each other in the first direction, a flange portion that protrudes outward from the frame portion, It includes a plurality of through-holes formed in the flange portion, provided in a position on a line parallel to the first direction in the support member which faces passing through the optical axis of the optical element A second rotating member supported rotatably about the second fulcrum,
The holding member, the first rotating member, and the second rotating member are fastened with screws having a diameter smaller than those through holes through the through holes of the flange portion that are overlapped with each other. And has a structure attached to the support member,
The first rotating member has a shaft hole or a shaft portion that is engaged with a shaft portion or a shaft hole located at the first fulcrum of the support member, so that the first rotation member rotates around the first fulcrum. While being supported movably, holding the cylindrical part movably in the direction along the pair of parallel parts inside the hole part of the frame part,
The second rotating member has a shaft hole or a shaft portion that is engaged with a shaft portion or a shaft hole located at the second fulcrum of the support member, so that the second rotation member rotates around the second fulcrum. While being supported movably, holding the cylindrical part movably in the direction along the pair of parallel parts inside the hole part of the frame part,
With the rotation operation of either the first rotation member or the second rotation member, the holding member moves the first direction and the second direction relative to the support member. A centering mechanism in which relative position adjustment in a direction orthogonal to the optical axis of the optical element is performed by moving in any direction.   2. The adjustment according to claim 1, further comprising an urging unit that urges the holding member, the first rotation member, and the second rotation member toward a surface facing the support member. Core mechanism.   The biasing means includes a spring washer interposed between the screw fastened to the screw hole, so that the holding member, the first rotating member, and the second rotating member are on the support member side. The alignment mechanism according to claim 2, wherein the alignment mechanism has a structure that is urged by the lens.   The alignment mechanism according to any one of claims 1 to 3, further comprising an adjustment unit that adjusts a position in a rotation direction between the first rotation member and the second rotation member. . The adjusting means has an adjusting member rotatably attached to an outer peripheral portion of the support member,
The adjustment member has an eccentric portion that is eccentric with respect to the rotation center thereof, and is engaged with a recess provided in an outer peripheral portion of the first rotation member and the second rotation member. The alignment mechanism according to claim 4, wherein the first rotating member and the second rotating member are moved in a rotating direction by rotating in a state.   The adjusting member is provided on the outer peripheral portion on the opposite side of the optical axis of the optical element between the first fulcrum of the first rotating member and the second fulcrum of the second rotating member. The alignment mechanism according to claim 5, wherein the alignment mechanism is engaged with the recess.   The adjustment member includes an eccentric pin rotatably attached to the support member, and an engagement member having a long hole that passes through the eccentric pin and engaged with the recess. The alignment mechanism according to claim 6. A lens barrel body in which a plurality of lenses are arranged in the optical axis direction;
A lens holding member that holds at least some of the plurality of lenses or the lens group;
A lens alignment mechanism that performs relative position adjustment in a direction orthogonal to the optical axis of the lens holding member,
A lens barrel comprising the alignment mechanism according to claim 1 as the lens alignment mechanism.   The lens barrel according to claim 8, wherein adjustment by the lens alignment mechanism can be performed through an opening provided in the barrel main body.   An optical apparatus comprising the lens barrel according to claim 8.

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