JP2012141519A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel capable of reducing an arrangement space while allowing an eccentricity adjustment and a tilt adjustment.SOLUTION: A lens barrel 10 includes a lens retaining frame 25 that retains a lens group 15 comprising at least one or more lenses, and a support frame 26 that supports the retaining frame 25 from the inside. The support frame includes at least three alignment through-holes 26b so as to extend towards the lens optical axis while surrounding the lens optical axis of the lens group. The respective alignment through-holes 26b coaxially incorporate: eccentricity adjusting members (62, 63, and 64) allowing the displacement of support points in the direction orthogonal to the lens optical axis (OA), of the lens retaining frame 25 with respect to the support frame 26; and tilt adjusting members 61 allowing the displacement of support points in the lens optical axis direction, of the lens retaining frame 25 with respect to the support frame 26.

Description

  The present invention relates to a lens barrel that holds a lens group, and more particularly to a lens barrel that facilitates alignment of a lens group.

  2. Description of the Related Art In recent years, a photographing apparatus such as a digital camera is required to be downsized and a high quality of a captured image. Here, in order to satisfy the demand for high image quality, the position of the lens group viewed in the direction orthogonal to the optical axis of the optical system in the lens barrel is determined according to the setting as the optical system. Positioning (eccentricity adjustment) and so-called lens that the inclination of the lens group with respect to the optical axis of the optical system is set to a predetermined inclination according to the setting as the optical system (tilting (tilting) adjustment) It is necessary to perform group alignment with high accuracy. Therefore, a lens alignment mechanism that holds one lens group of an optical system composed of a plurality of lens groups with a lens holding frame, and enables alignment of the lens group by adjusting the position of the lens holding frame with respect to the photographing optical axis. Is already known (see Patent Document 1).

  In this lens barrel, the 5th group holding frame that holds the 5th group lens is the first on the 5th group holding plate that is fixed to the extending portion of the 3rd group holding frame that holds the 3rd group lens group on the image side. A lens alignment mechanism is configured by being held via the adjustment member and the second adjustment member. This first adjustment member is provided at three locations so as to surround the fifth group holding frame, and by displacing the position in the direction orthogonal to the respective imaging optical axis, the first adjustment member in the direction orthogonal to the imaging optical axis is provided. The position of the fifth group holding frame with respect to the fifth group holding plate can be adjusted. In addition, the second adjustment member is provided at three positions so as to surround the fifth group holding frame separately from the three first adjustment members. The inclination of the fifth group holding frame with respect to the group holding plate can be adjusted. Therefore, in this lens barrel, the decentering adjustment of the fifth group lens can be performed by the three first adjustment members, and the tilt adjustment of the fifth group lens can be performed by the three second adjustment members.

  However, in the configuration of the conventional lens barrel described above, when adjusting the position of the lens group (group 5 holding frame) in the direction orthogonal to the photographing optical axis (eccentricity adjustment), the direction is orthogonal to the photographing optical axis. Therefore, it is necessary to provide at least three first adjustment members because it is necessary to provide at least three support points that enable relative displacement of the first adjustment member. In addition, when adjusting the tilt of the lens group (tilt adjustment), it is necessary to provide at least three support points that allow relative displacement in the direction of the photographic optical axis. Therefore, at least three second adjustment members are provided. There is a need. For this reason, in the conventional lens barrel, it is necessary to provide a total of at least six first adjustment members and second adjustment members as a lens alignment mechanism. It is necessary to provide arrangement spaces at six locations in the holding configuration. This leads to a decrease in space efficiency, hinders downsizing, complicates the configuration, and it is difficult to provide six arrangement spaces in the first place. There is room for improvement.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lens barrel that can reduce the arrangement space while allowing eccentric adjustment and tilt adjustment. .

  The lens barrel according to claim 1 is a lens barrel including a lens holding frame that holds a lens group including at least one lens, and a support frame that supports the lens holding frame on the inside. The support frame is provided with at least three alignment through holes so as to extend around the lens optical axis of the lens group and extend toward the lens optical axis. Is a decentering adjustment member capable of displacing a support point in a direction perpendicular to the lens optical axis of the lens holding frame with respect to the support frame, and an optical axis direction of the lens holding frame with respect to the support frame in the lens optical axis direction. A tilt adjusting member that can displace the support point is incorporated on the same axis.

  The lens barrel according to claim 2 is the lens barrel according to claim 1, wherein at least two of the eccentricity adjusting members are arranged in the alignment through-hole in the alignment through-hole. The support point can be moved back and forth in the hole axis direction to displace the support point in the hole axis direction along with the rotation around the hole axis line, and at least one of the lens holding frame is placed in the hole axis line in the alignment through hole. It is characterized in that it can be biased inward.

  The lens barrel according to claim 3 is the lens barrel according to claim 1, wherein each eccentricity adjusting member is a hole of the alignment through hole in each alignment through hole. The support point can be moved forward and backward in the hole axis direction so as to displace the support point in the hole axis direction along with the rotation around the axis line.

  A lens barrel according to a fourth aspect is the lens barrel according to any one of the first to third aspects, wherein the tilt adjusting member is provided in each of the alignment through holes. An eccentric shaft portion is provided that extends in the hole axis direction of the alignment through-hole and is eccentric from the hole axis line, and the tilt adjustment member is provided in each of the alignment through-holes, The rotation around the hole axis is possible, and the eccentric shaft portion can be brought into contact with the lens holding frame in the lens optical axis direction.

  The lens barrel according to claim 5 is the lens barrel according to claim 4, wherein the lens holding frame is attached to each of the eccentric shaft portions in the lens optical axis direction. An optical axis direction urging member for urging is provided.

  The lens barrel according to claim 6 is the lens barrel according to any one of claims 1 to 5, wherein each eccentricity adjusting member is fitted into the alignment through hole. It has a possible cylindrical shape, and each of the tilt adjustment members can be fitted into a hollow portion of each of the eccentric adjustment members.

  A lens barrel according to a seventh aspect is the lens barrel according to any one of the first to sixth aspects, wherein the lens group is a first lens group, and the lens holding frame is a first lens group. As one lens holding frame, a second lens group composed of at least one lens, a second lens holding frame that holds the second lens group, the support frame, and the second lens And a lens barrel that holds the holding frame in a movable manner.

  An imaging device according to an eighth aspect uses the lens barrel according to any one of the first to seventh aspects.

  A digital camera according to a ninth aspect uses the lens barrel according to any one of the first to seventh aspects.

  A portable information terminal device according to a tenth aspect uses the lens barrel according to any one of the first to seventh aspects.

  An image input device according to an eleventh aspect uses the lens barrel according to any one of the first to seventh aspects.

  In the lens barrel according to claim 1, an eccentricity adjusting member for adjusting the eccentricity of the lens holding frame with respect to the support frame and an inclination adjusting member for adjusting the tilt are mutually connected to each alignment through-hole of the support frame. Since it is rotatably integrated on the same axis (hole axis), the eccentricity adjustment and the inclination adjustment can be performed independently of each other while the arrangement space for the eccentricity adjustment member and the inclination adjustment member is halved. .

  In addition, since the lens holding frame, that is, the lens group can be eccentrically adjusted and tilted (alignment) while being supported by the eccentricity adjusting member and the tilting adjusting member in the support frame, the centering can be performed. Since it is not necessary to fix with an adhesive or the like in order to maintain the alignment state after the operation is completed, it is possible to obtain a photographing optical system in which the lens group is aligned with high accuracy.

  In addition to the above-described configuration, at least two of each of the eccentricity adjusting members has the support point in the direction of the hole axis along with the rotation about the hole axis of the centering through hole in the centering through hole. If it is possible to move forward and backward in the hole axis direction to displace, and at least one of the lens holding frames can be biased inward in the hole axis line direction in the alignment through-hole, The eccentric position of the lens holding frame, that is, the lens group can be adjusted simply by changing the support point to the lens holding frame by the eccentric adjustment member that can be moved back and forth in the direction of the hole axis by rotating operation. The work for adjustment can be made simpler.

  In addition, the lens holding frame is always attached to the support point by the eccentricity adjusting member that can be moved back and forth in the hole axis direction when viewed in the direction orthogonal to the photographing optical axis in the support frame. Therefore, the support position of the lens holding frame, that is, the lens group in the direction orthogonal to the photographing optical axis with respect to the support frame can be adjusted more appropriately.

  In addition to the above-described configuration, each eccentricity adjusting member displaces the support point in the direction of the hole axis in each of the centering through holes as the centering through hole rotates about the hole axis. Assuming that it is possible to advance and retract in the direction of the hole axis, it is possible to adjust the inclination of the lens holding frame, that is, the lens group by rotating each tilt adjusting member, so that the lens group can be configured with a simple configuration. The tilt can be adjusted.

  In addition to the configuration described above, the tilt adjusting member includes an eccentricity that extends in the axial direction of the alignment through-hole and is eccentric from the axial axis in each alignment through-hole. A shaft portion is provided, and the tilt adjustment member is capable of rotating around the hole axis line in each of the alignment through holes, and the eccentric shaft portion in the lens optical axis direction. Assuming that the lens can be brought into contact with the lens holding frame, the change amount in the photographing optical axis direction of the lens group with respect to the rotation operation amount of the tilt adjustment member is made small while gradually reducing the amount of change in the lens unit relative to the rotation operation amount. Therefore, it is possible to adjust the inclination of the lens group with higher accuracy.

  In addition to the above-described configuration, the support frame is provided with an optical axis direction biasing member that biases the lens holding frame toward the eccentric shaft part side in the lens optical axis direction. The support position of the lens holding frame, that is, the lens group in the photographing optical axis direction with respect to the support frame can be adjusted more appropriately.

  In addition to the configuration described above, each of the eccentricity adjustment members has a cylindrical shape that can be fitted into the alignment through hole, and each of the tilt adjustment members is fitted into a hollow portion of each of the eccentricity adjustment members. If it is possible, the eccentricity adjustment member and the inclination adjustment member can be incorporated on the same axis (hole axis) while enabling the eccentricity adjustment and the inclination adjustment in each alignment through hole. For this reason, it can be set as a smaller and simple structure.

  In addition to the above-described configuration, the lens group is a first lens group, the lens holding frame is a first lens holding frame, a second lens group including at least one lens, and the first lens group. And a second lens holding frame that holds the second lens group, and a lens barrel that holds the support frame and the second lens holding frame so as to be movable inside. Since the first lens holding frame that holds the first lens group that is precisely aligned by the mechanism can be incorporated as it is as an imaging optical system, higher imaging performance can be obtained.

1 is a longitudinal sectional view schematically showing main portions of each lens group, each lens holding frame, and various lens barrels 10 in an example lens barrel 10 according to the present invention. FIG. 6 is a perspective view schematically showing a support structure in which a fifth lens holding frame 25 is supported by a fifth lens support frame 26 via a lens alignment mechanism 60, and FIG. FIG. 5B shows a state in which the fifth lens support frame 26 is supported by the fifth lens support frame 26 via the lens alignment mechanism 60, and FIG. 5B shows the fifth lens support frame 26 in which the fifth lens holding frame 25 and the wave washer 65 are inserted. It shows a state where three tilt adjusting members 61, two eccentric adjusting screws 62, an eccentric adjusting fixing screw 63, and a compression spring 64 are inserted into each alignment through hole 26b. It is a typical perspective view which expand | deploys and shows FIG. 2 for every component. 5 is a schematic perspective view for explaining the configuration of a tilt adjusting member 61 and a tilt engaging hole 27. FIG. 6 is a schematic perspective view for explaining the configuration of a tilt adjustment member 61. FIG. 4 is a schematic perspective view for explaining the configuration of an eccentricity adjusting screw 62. FIG. 4 is a schematic perspective view for explaining the configuration of an eccentricity adjustment fixing screw 63 and a compression spring 64. FIG. It is sectional drawing obtained along the II line | wire shown in FIG. It is sectional drawing obtained along the II-II line | wire shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing an external configuration of a camera 100 using a lens barrel 10 according to the present invention as viewed from the subject side, in which (a) is a state in which a photographing lens is retracted into a camera body. , (B) shows a state in which the photographing lens protrudes from the camera body. It is a typical perspective view which shows the external appearance of the camera 100 seen from the back side which is a photographer side. 2 is a block diagram showing a functional configuration of a camera 100. FIG.

  Embodiments of a lens barrel according to the present invention will be described below with reference to the drawings.

  A schematic configuration of a lens barrel 10 as an embodiment of a lens barrel according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the optical apparatus including the lens barrel 10 includes a first lens group 11, a second lens group 12, a third lens group 13, a fourth lens group 14, a fifth lens group 15, a shutter / aperture. Unit 16, solid-state imaging device 17, low-pass filter 18, rectilinear cylinder 21, second lens holding frame 22, third lens holding frame 23, fourth lens holding frame 24, fifth lens holding frame 25, fifth lens support frame 26, a fixed cylinder 31, a first rotating cylinder 32, a second rotating cylinder 33, a rectilinear liner 34, a focus motor 51, and a lens alignment mechanism 60.

  In this optical device (shooting optical system), a first lens group 11, a second lens group 12, a third lens group 13, a fourth lens group 14, and a fifth lens group 15 are sequentially arranged from the subject (object) side. In addition, a shutter / aperture unit 16 is inserted between the third lens group 13 and the fourth lens group 14. On the image plane side of the fifth lens group 15, a solid-state imaging device 17 configured using a CCD (charge coupled device) or the like, and a low-pass filter 18 are disposed so as to cover the light receiving surface. Although not shown, the solid-state imaging device 17 is mounted on a substrate on which electronic components are mounted to form an electronic circuit unit, and the substrate is fixed to a base member that is not shown.

  The first lens group 11 is composed of one or more lenses. The first lens group 11 is fixedly held on the rectilinear barrel 21 via a first lens holding frame (not shown) that holds them together.

  The second lens group 12 includes one or more lenses. The second lens group 12 is fixedly held by the second lens holding frame 22. A cam follower 22 a is provided at the rear end of the outer peripheral surface of the second lens holding frame 22. The cam follower 22a is formed so as to protrude from the outer peripheral surface in the radial direction (hereinafter also referred to as the radial direction) from the rotation center, engages with the straight key groove 34b of the straight liner 34, and the tip thereof is the first rotary cylinder. 32 is engaged with a cam groove 32b provided on the inner peripheral surface.

  The third lens group 13 is composed of one lens. The third lens group 13 is fixedly held by a third lens holding frame 23. The third lens holding frame 23 is supported by a lead screw 51a of the focus motor 51 fixed to the second lens holding frame 22 by a nut mechanism or a rack mechanism (not shown). The third lens holding frame 23 can move integrally with the second lens holding frame 22 in the photographic optical axis direction and is driven with respect to the second lens holding frame 22 by driving the focus motor 51. It is possible to move to. In the present embodiment, the third lens group 13 is used as a focus lens for focusing, that is, focusing, and the position in the direction of the photographing optical axis is adjusted by the rotation of the focus motor 51 during focus adjustment.

  The fourth lens group 14 includes one or more lenses. The fourth lens group 14 is fixedly held by a fourth lens holding frame 24. The fourth lens holding frame 24 integrally holds the shutter / aperture unit 16, and a cam follower 24a is provided at the rear end portion of the outer peripheral surface. The cam follower 24 a is formed so as to protrude in the radial direction from the rear end portion, engages with the linear key groove 34 b of the linear liner 34, and has a leading end cam groove 32 c provided on the inner peripheral surface of the first rotary cylinder 32. Is engaged.

  The fifth lens group 15 includes one or more lenses. The fifth lens group 15 is fixedly held by the fifth lens holding frame 25. The fifth lens holding frame 25 is supported by the fifth lens support frame 26 via the lens alignment mechanism 60. A cam follower 26 a is provided at the rear end of the outer peripheral surface of the fifth lens support frame 26. The cam follower 26 a is formed so as to protrude in the radial direction from the rear end portion, engages with the rectilinear key groove 34 b of the rectilinear liner 34, and has a tip provided on the inner peripheral surface of the first rotating cylinder 32. It engages with the groove 32d. The lens alignment mechanism 60 and its peripheral configuration will be described in detail later.

  The shutter / aperture unit 16 integrally held by the fourth lens holding frame 24 includes a shutter and an aperture stop. The first lens group 11 to the fifth lens group 15 constitute an imaging optical system as a zoom lens having a variable focal length. The electronic circuit unit (solid-state imaging device 17) described above is disposed at the imaging position of the imaging optical system. In this specification, the optical axis in the imaging optical system, that is, the rotationally symmetric axis that is the central axis position of the first lens group 11 to the fifth lens group 15 is defined as the lens optical axis of the imaging optical system, that is, the lens barrel 10. It is assumed that the photographing optical axis OA.

  The fixed cylinder 31 has a cylindrical shape as a whole and is fixed to a base member (not shown). A helicoid 31 a is formed on the inner peripheral surface of the fixed cylinder 31. A second rotating cylinder 33 is fitted on the inner periphery of the fixed cylinder 31.

  The second rotating cylinder 33 has a cylindrical shape as a whole. In the second rotating cylinder 33, a helicoid 33a is provided at the rear end portion of the outer peripheral surface, and a drive pin 33b is provided at the rear end portion of the inner peripheral surface. The helicoid 33 a is screwed into a helicoid 31 a provided on the inner peripheral surface of the fixed cylinder 31. Further, the drive pin 33 b is formed to project from the base end portion in the radial direction, and engages with a rectilinear groove (not shown) provided on the outer periphery of the first rotary cylinder 32. For this reason, when the first rotating cylinder 32 rotates with respect to the fixed cylinder 31, the second rotating cylinder 33 is engaged with the first rotating cylinder 32 by engagement with a straight groove (not shown) of the drive pin 33b. While rotating integrally, the helicoid 33a advances and retreats in the direction of the photographing optical axis OA with respect to the fixed cylinder 31 (also with respect to the first rotating cylinder 32) by screwing into the helicoid 31a. The rectilinear cylinder 21 is fitted to the inner periphery of the second rotating cylinder 33.

  The rectilinear cylinder 21 has a cylindrical shape as a whole. The straight cylinder 21 is provided with a cam follower 21a on the outer peripheral surface and a straight groove (not shown) extending along the photographing optical axis OA on the inner peripheral surface. The cam follower 21 a is formed so as to protrude in the radial direction from the outer peripheral surface along a surface orthogonal to the photographing optical axis OA, and is engaged with a cam groove 33 c provided on the inner peripheral surface of the second rotating cylinder 33. . A first rotary cylinder 32 is fitted to the inner periphery of the rectilinear cylinder 21, and a rectilinear liner 34 is fitted to the inner periphery thereof.

  The rectilinear liner 34 has a cylindrical shape as a whole and is fixed to a base member (not shown). The linear liner 34 is provided with a key portion 34a at the distal end portion of the outer peripheral surface and a linear key groove 34b at the peripheral wall portion. The key portion 34 a is formed to project from the outer peripheral surface in the radial direction, and engages with a rectilinear groove (not shown) provided on the inner peripheral surface of the rectilinear cylinder 21. For this reason, the rectilinear liner 34 is relatively moved in the direction of the photographic optical axis OA while restricting rotation of the rectilinear cylinder 21 around the photographic optical axis OA by engagement with a rectilinear groove (not shown) of the key portion 34a. It is possible to move. Further, the rectilinear key groove 34b extends in the photographing optical axis OA direction while passing through the peripheral wall portion in the radial direction. The second lens holding frame 22, the fourth lens holding frame 24, and the fifth lens support frame 26 are fitted to the inner periphery of the linear advance liner 34, and the linear key groove 34b has a linear key groove 34b as described above. The cam follower 22a of the second lens holding frame 22, the cam follower 24a of the fourth lens holding frame 24, and the cam follower 26a of the fifth lens support frame 26 are inserted. For this reason, the rectilinear liner 34 receives the cam follower 22a, the cam follower 24a, and the cam follower 26a in the rectilinear keyway 34b, so that the second lens retaining frame 22, the fourth lens retaining frame 24, and the fifth lens supporting frame 26 are photographed. A relative movement in the direction of the photographing optical axis OA is made possible while restricting rotation around the optical axis OA. A first rotating cylinder 32 is fitted on the outer periphery of the linear liner 34.

  The first rotating cylinder 32 has a cylindrical shape as a whole. The first rotating cylinder 32 is sandwiched between a key portion 34 a of the linear advancer 34 and a base member (not shown) in the direction of the photographing optical axis OA, and with respect to the base member (not shown), that is, the linear liner 34. Thus, rotation around the photographing optical axis OA is possible while fixing the position in the direction of the photographing optical axis OA (shooting optical path). A gear portion 32 a is formed at the outer peripheral surface proximal end portion of the first rotating cylinder 32. The gear portion 32a is screwed with a gear of a driving device (not shown) fixedly provided on a base member (not shown). For this reason, the first rotating cylinder 32 is rotationally driven with respect to the fixed cylinder 31 and the rectilinear liner 34 when the driving force of the driving device is transmitted to the gear. A cam groove 32b, a cam groove 32c, and a cam groove 32d are provided on the inner peripheral surface of the first rotary cylinder 32. As described above, the cam follower 22a passing through the straight key groove 34b is engaged with the cam groove 32b, the cam follower 24a passing through the straight key groove 34b is engaged with the cam groove 32c, and the cam groove 32d goes straight. The cam follower 26a that has passed through the keyway 34b is engaged. Therefore, when the first rotating cylinder 32 is rotationally driven with respect to the fixed cylinder 31 and the rectilinear liner 34, the second lens holding frame 22 moves forward and backward so as to follow the cam locus of the cam groove 32b, and the fourth lens. The holding frame 24 advances and retreats so as to follow the cam locus of the cam groove 32c, and the fifth lens support frame 26 advances and retreats so as to follow the cam shape cam locus of the cam groove 32d.

  In the lens barrel 10, due to the above-described configuration, the driving force of a driving device (not shown) is appropriately transmitted to the gear portion 32 a via a gear to rotate the first rotating cylinder 32, thereby the first lens group. 11, the second lens group 12, the third lens group 13, the fourth lens group 14 (shutter / aperture unit 16), and the fifth lens group 15 perform a zooming operation in a predetermined manner.

  Next, the support structure of the fifth lens holding frame 25 through the lens alignment mechanism 60 in the fifth lens support frame 26 will be described. FIG. 2 is a perspective view schematically showing a support structure in which the fifth lens holding frame 25 is supported by the fifth lens support frame 26 via the lens alignment mechanism 60, and FIG. It is a typical perspective view developed and shown for every part. Hereinafter, the radial direction described above is referred to as a radial direction with respect to the photographing optical axis OA.

  The fifth lens holding frame 25 holds the fifth lens group 15 as described above. As shown in FIGS. 2 and 3, the fifth lens holding frame 25 has a disk shape that can be accommodated on the inner periphery of the fifth lens support frame 26, and the fifth lens group 15 is fitted and held in the center. A holding hole 25a is provided, and a peripheral wall portion 25b is provided at the peripheral portion. The peripheral wall portion 25b is an annular wall portion centered on the photographing optical axis OA viewed with the fifth lens group 15 to be held, and extends from the peripheral portion toward the rear end side (image plane side). An outer peripheral surface of the fifth lens holding frame 25 is formed. The peripheral wall portion 25b (fifth lens holding frame 25) is fifth in the direction orthogonal to the photographing optical axis OA (the radial direction with respect to the photographing optical axis OA) in the fifth lens support frame 26 for the purpose of eccentricity adjustment. The outer diameter dimension has a play (interval) that allows the lens holding frame 25 to be displaced (see FIGS. 8 and 9).

  Three tilting engagement holes 27 are provided in the peripheral wall portion 25b. Each tilting engagement hole 27 is formed so as to penetrate the peripheral wall portion 25b in the radial direction with respect to the photographing optical axis OA (see FIGS. 8 and 9). As shown in FIG. 4, each tilting engagement hole 27 basically has a circular shape when viewed in a cross section orthogonal to the axis of the tilting engagement hole 27. In the present embodiment, the tilting engagement holes 27 are provided at the same position (every 120 degrees in rotation angle) when viewed in the direction around the photographing optical axis OA. Each tilting engagement hole 27 is provided with a hole diameter expanding portion 27a so as to form a pair in a direction orthogonal to the axis of the tilting engagement hole 27 (radial direction with respect to the axis).

  The pair of hole diameter expanding portions 27a penetrates the peripheral wall portion 25b in the radial direction with respect to the photographing optical axis OA so as to allow insertion of an engaging piece portion 61c of the tilt adjusting member 61 described later. Further, the peripheral wall portion 25b is provided with a circular outer receiving recess 27b so as to surround the tilting engagement hole 27 on the outer peripheral surface side, and the tilting engagement hole 27 is provided on the inner peripheral surface side of the peripheral wall portion 25b. A circular inner receiving recess 27c (see FIGS. 8 and 9) is provided so as to surround it. For this reason, in each of the tilting engagement holes 27, the thickness dimension viewed in the axial direction of the tilting engagement hole 27 (radial direction with respect to the photographing optical axis OA) by the outer receiving recess 27b and the inner receiving recess 27c. The engagement rib portion 27d is defined. The engagement rib portion 27d defines a substantial hole shape (inner diameter dimension) in the tilting engagement hole 27.

  Further, on the outer peripheral surface of the peripheral wall 25b, a contact protrusion 28 is provided in the vicinity of the two tilting engagement holes 27. In other words, the contact protrusion 28 is not provided in the vicinity of the remaining one tilting engagement hole 27. Both abutting protrusions 28 are provided at positions adjacent to the outer receiving recesses 27b of the corresponding tilting engagement holes 27, and are formed to project from the outer peripheral surface in the radial direction with respect to the photographing optical axis OA. In the present embodiment, both contact protrusions 28 have a semicircular cross section (see FIG. 8).

  As shown in FIGS. 2 and 3, the fifth lens support frame 26 that supports the fifth lens holding frame 25 has a cylindrical shape as a whole, and can be fitted to the inner periphery of the rectilinear liner 34. (See FIG. 1). In the fifth lens support frame 26, as described above, the cam follower 26a provided at the rear end portion of the outer peripheral surface is engaged with the cam groove 32d of the first rotary cylinder 32 via the straight key groove 34b of the straight liner 34. By being combined, the first rotary cylinder 32 can be moved forward and backward by the rotational drive. The fifth lens support frame 26 is provided with three alignment through holes 26b and support ribs 26c. Each alignment through-hole 26b is formed so as to penetrate the peripheral wall portion of the fifth lens support frame 26 in the radial direction with respect to the photographing optical axis OA, and is orthogonal to the axis (hereinafter also referred to as a hole axis BA). It has a circular shape when viewed in cross section. Each of the alignment through holes 26b corresponds to each of the tilting engagement holes 27 of the fifth lens holding frame 25, that is, the fifth lens holding frame accommodated (supported) when viewed in the radial direction with respect to the photographing optical axis OA. It is possible to match each of the 25 tilting engagement holes 27 with the axis of each other. In the present embodiment, each of the alignment through holes 26b is provided at the same position (every 120 degrees in rotation angle) when viewed in the direction around the photographing optical axis OA. A thread groove (female thread) is provided on the inner peripheral wall surface of each alignment through hole 26b.

  The support ribs 26c are extended inward from the inner peripheral surface so as to reduce the inner diameter of the fifth lens support frame 26 on the rear end side (image surface side) with respect to each alignment through hole 26b. It is provided over the entire circumference around the photographing optical axis OA. When the fifth lens holding frame 25 is accommodated in the inner periphery of the fifth lens support frame 26, the support rib 26c and the rear end surface 25c (the rear end surface of the peripheral wall portion 25b (see FIGS. 8 and 9)) and Thus, it is possible to sandwich a wave washer 65 which will be described later. In this embodiment, the support rib 26c can be opposed to the rear end surface 25c of the fifth lens holding frame 25 in the direction of the photographing optical axis OA. A lens alignment mechanism 60 is provided to support the fifth lens holding frame 25 within the fifth lens support frame 26.

  As shown in FIG. 3, the lens alignment mechanism 60 includes three tilt adjustment members 61, two eccentric adjustment screws 62, an eccentric adjustment fixing screw 63, a compression spring 64, a wave washer 65, Have

  The tilt adjustment member 61 forms a support point in the direction of the photographing optical axis OA of the fifth lens holding frame 25 with respect to the fifth lens support frame 26. As shown in FIG. 5, the tilt adjustment member 61 includes a main body column part 61a, an eccentric shaft part 61b, and a pair of engagement piece parts 61c. The main body column portion 61a has a cylindrical shape, and can be freely fitted into an inner hole portion 62a of an eccentricity adjustment screw 62, which will be described later, or an inner hole portion 63c of an eccentricity adjustment fixing screw 63. (See FIG. 8 or FIG. 9). The main body column portion 61a can enter the outer receiving recess 27b in the tilting engagement hole 27, and in the engagement rib portion 27d (a space between the pair of engagement rib portions 27d). The outer diameter is not allowed to pass through. The main body column part 61a is provided with a slit groove 61d at the tip part (the side opposite to the eccentric shaft part 61b). The slit groove 61d is a groove portion that dents the front end surface of the main body column portion 61a in a slit shape, and forms a so-called negative hole shape. The axis of the main body column part 61 a is set as a central axis CA in the tilt adjustment member 61.

  The eccentric shaft portion 61b has a cylindrical shape with a smaller diameter than the main body column portion 61a, and extends to the engagement rib portion 27d of the tilting engagement hole 27 (the space between the paired engagement rib portions 27d). It can be inserted. The eccentric shaft portion 61b is sized so as to be movable in a direction orthogonal to the axis within the engagement rib portion 27d of the tilting engagement hole 27 (see FIGS. 8 and 9). . The eccentric shaft portion 61b is continuous with the main body column portion 61a so that the eccentric axis EA is eccentric from the central axis CA (ie, shifted in parallel with the central axis CA) when the axis is the eccentric axis EA. Has been. A pair of engaging piece portions 61c are provided on the eccentric shaft portion 61b.

  Both engaging piece portions 61c are formed so as to protrude from the outer peripheral surface of the eccentric shaft portion 61b so as to form a pair in a direction orthogonal to the eccentric axis EA, and each hole diameter expanding portion 27a of the tilting engagement hole 27 is formed. The tilting engagement hole 27 can be inserted in the axial direction. Both the engaging piece portions 61c have an outer diameter dimension capable of entering the inner receiving recess 27c in the tilting engagement hole 27. As shown in FIGS. 8 and 9, both the engagement piece portions 61 c sandwich the engagement rib portion 27 d of the tilting engagement hole 27 between the upper end surface 61 e and the lower end surface 61 f of the main body column portion 61 a. The position is set so that you can. In other words, the tilt adjusting member 61 has the lower end surface 61f of the main body column portion 61a is directed to the outer receiving recess 27b and the upper end surfaces 61e of both engagement piece portions 61c are set to the inner receiving recesses in the tilting engagement hole 27. It is possible to address the location 27c. Therefore, the tilt adjusting member 61 is rotated in the tilting engagement hole 27 after the pair of engagement piece portions 61c are inserted into the tilting engagement hole 27 in correspondence with the pair of hole diameter expanding portions 27a. Thus, the so-called bayonet engagement that prevents the pair of engagement piece portions 61c (the upper end surface 61e) from engaging with the inner receiving recess 27c and falling off from the tilting engagement hole 27 is enabled.

  The two eccentricity adjusting screws 62 form support points in the direction perpendicular to the photographing optical axis OA of the fifth lens holding frame 25 with respect to the fifth lens support frame 26. Both the eccentricity adjusting screws 62 have a cylindrical shape as shown in FIG. Both eccentricity adjusting screws 62 have an outer diameter dimension that allows the fifth lens support frame 26 to be fitted into the alignment through hole 26b. The outer peripheral wall surface has an inner peripheral wall surface of the alignment through hole 26b. A thread groove (male thread) is provided that can be screwed into the thread groove provided in the. An inward hole portion 62 a as a hollow portion of both eccentricity adjusting screws 62 is defined by an inner peripheral surface centering on the axis of the eccentricity adjusting screw 62, and the rotation of the main body column portion 61 a of the tilt adjusting member 61. Free fitting is allowed (see FIG. 8). For this reason, the both eccentricity adjusting screws 62 are inserted into the alignment through hole 26b, so that the alignment through hole 26b can be moved in the direction of the hole axis BA along with the rotation. The tilt adjustment member 61 can be rotatably held by the inner hole portion 62a so that the center axis CA coincides with the hole axis BA. Further, when both the eccentricity adjusting screws 62 are moved toward the photographing optical axis OA in the direction of the hole axis BA in the alignment through hole 26b, the bottom wall 62b is moved to the peripheral wall portion of the fifth lens holding frame 25. It is possible to abut on the abutting projection 28 of 25b (see FIG. 8).

  Each of the eccentricity adjusting screws 62 has a slit groove 62c at the tip (on the side opposite to the bottom surface 62b). The slit groove 62c is a groove portion that dents the front end surface in a slit shape, and forms a so-called negative hole shape. Both eccentricity adjusting screws 62 are moved to the photographing optical axis OA side in the direction of the hole axis BA in the alignment through hole 26b to the position where the bottom surface 62b contacts the contact protrusion 28 (see FIG. 8), the bottom of the slit groove 62c at the tip is on the upper side (outside in the radial direction with respect to the photographing optical axis OA) with respect to the tip of the tilt adjusting member 61 (the tip position of the slit groove 61d) received by the inner hole portion 62a. It is supposed to be located.

  The eccentricity adjustment fixing screw 63 forms a support point in the direction orthogonal to the photographing optical axis OA of the fifth lens holding frame 25 with respect to the fifth lens support frame 26. As shown in FIG. 7, the eccentric adjustment fixing screw 63 has a tubular shape as a whole, and has a stepped end (one end side (outside in the radial direction with respect to the photographing optical axis OA)) having a relatively large diameter. (See FIG. 9). The large-diameter portion 63a of the eccentricity adjusting fixing screw 63 has an outer diameter dimension that allows the fifth lens support frame 26 to be fitted into the alignment through hole 26b. A thread groove (male thread) that can be screwed into the thread groove on the inner peripheral wall surface of the through hole 26b is provided. The small-diameter portion 63b of the eccentricity adjusting fixing screw 63 has an outer diameter that allows insertion of a compression spring 64, which will be described later, into the inside. An inward hole portion 63c as a hollow portion of the eccentricity adjustment fixing screw 63 passes through the large diameter portion 63a and the small diameter portion 63b, and is defined by an inner peripheral surface centering on the axis of the eccentricity adjustment fixing screw 63. Has been. The inward hole portion 63c allows the main body column portion 61a of the tilt adjustment member 61 to be freely fitted (see FIG. 9). For this reason, the eccentric adjustment fixing screw 63 is inserted into the alignment through hole 26b, so that the position of the alignment through hole 26b in the direction of the hole axis BA can be changed with rotation. The tilt adjustment member 61 can be rotatably held by the inner hole portion 63c so that the center axis CA can be aligned with the hole axis BA. Yes.

  The eccentric adjustment fixing screw 63 is provided with a slit groove 63d at the tip of the large diameter portion 63a (on the side opposite to the small diameter portion 63b). The slit groove 63d is a groove portion that dents the front end surface in a slit shape, and forms a so-called negative hole shape. The eccentric adjustment fixing screw 63 is moved to the photographing optical axis OA side in the hole axis BA direction to a position where the compression spring 64 described later is appropriately compressed in the alignment through hole 26b (see FIG. 9). ), The bottom of the slit groove 63d at the tip is positioned above (outside in the radial direction with respect to the photographing optical axis OA) from the tip of the tilt adjusting member 61 received by the inner hole portion 63c (tip position of the slit groove 61d). It is supposed to be.

  The compression spring 64 can surround the small diameter portion 63b of the eccentricity adjusting fixing screw 63 and has an inner diameter dimension that does not allow the large diameter portion 63a to be inserted. Further, the compression spring 64 allows the fifth lens support frame 26 to be inserted into the alignment through hole 26b and is not allowed to be inserted into the tilting engagement hole 27 of the fifth lens holding frame 25. It is the diameter dimension. In this embodiment, the compression spring 64 surrounds the small-diameter portion 63b of the eccentricity adjustment fixing screw 63, and one end 64a is brought into contact with the lower surface 63e of the large-diameter portion 63a (the surface on the small-diameter portion 63b side). The end 64b can be brought into contact with the outer peripheral surface of the peripheral wall portion 25b of the fifth lens holding frame 25 so as to surround the outer receiving recess 27b of the tilting engagement hole 27 (see FIG. 9). For this reason, the compression spring 64 is disposed in the tilting engagement hole 27 together with the eccentricity adjustment fixing screw 63, whereby the lower surface 63 e of the large-diameter portion 63 a of the eccentricity adjustment fixing screw 63 and the fifth lens holding frame 25. It is possible to urge the outer peripheral wall portion 25b of the peripheral wall portion 25b away from each other. In the compression spring 64, the biasing direction is set to the direction of the hole axis BA of the tilting engagement hole 27, that is, the radial direction with respect to the photographing optical axis OA by the small diameter portion 63b of the eccentricity adjusting fixing screw 63. The compression spring 64 is not limited to the configuration of the present embodiment as long as it can urge the fifth lens holding frame 25 inward in the hole axis BA direction within the alignment through hole 26b. .

  The wave washer 65 urges the fifth lens support frame 25 toward the support point (the outer peripheral surface of the eccentric shaft portion 61b) formed by the tilt adjustment member 61 with respect to the fifth lens support frame 26. It is an axial urging member. In this embodiment, as shown in FIG. 3, the wave washer 65 is formed by forming a belt-like material that can be elastically deformed into an annular shape, and its axial direction (corresponding to the photographing optical axis OA). It is so-called corrugated that is undulated so that its height position differs depending on the position in the circumferential direction. The wave washer 65 has an outer diameter dimension that can be fitted to the inner periphery of the fifth lens support frame 26, and can be brought into contact with the support rib 26c. For this reason, the wave washer 65 extends between the support rib 26c and the rear end surface 25c (the rear end surface of the peripheral wall portion 25b) of the fifth lens holding frame 25 that can face the support rib 26c in the direction of the photographing optical axis OA. It is possible to do. The wave washer 65 urges the fifth lens holding frame 25 toward the support point formed by the tilt adjustment member 61 (the outer peripheral surface of the eccentric shaft portion 61b) with respect to the fifth lens support frame 26. However, the present invention is not limited to the configuration of this embodiment.

  Next, a procedure for assembling the support structure of the fifth lens holding frame 25 via the lens alignment mechanism 60 in the fifth lens support frame 26 will be described. In addition, the assembly | attachment procedure described below is an example, and is not limited to a present Example.

  In this support structure, as shown in FIG. 3, first, a wave washer 65 is inserted from the object side (front end side) of the fifth lens support frame 26, and the wave washer 65 is inserted into the fifth lens support frame 26. It arrange | positions in contact with the support rib 26c. Thereafter, the fifth lens holding frame 25 is inserted from the object side (front end side) of the fifth lens support frame 26, and the rear end face 25c (the rear end face of the peripheral wall portion 25b) of the fifth lens holding frame 25 is wave-washed. It is placed in contact with 65. As a result, the wave washer 65 is sandwiched between the rear end surface 25c of the fifth lens holding frame 25 and the support rib 26c (see FIGS. 8 and 9). At this time, the alignment through holes 26b of the fifth lens support frame 26 and the tilting engagement holes 27 of the fifth lens holding frame 25 are matched (the center axis CA is aligned with the hole axis BA). Positional relationship.

  Next, as shown in FIG. 2B, the tilt adjustment member 61 is inserted into the alignment through hole 26 b from the outside of the fifth lens support frame 26, and the fifth lens is positioned on the inside thereof. It is inserted into the tilting engagement hole 27 of the frame 25 (see FIG. 4). At this time, the pair of engaging pieces 61c of the tilt adjusting member 61 are inserted into the tilting engaging holes 27 in correspondence with the pair of hole diameter expanding portions 27a (see FIG. 4). As shown in FIGS. 8 and 9, the tilt adjusting member 61 is rotated in the tilting engagement hole 27 to engage the pair of engagement piece portions 61c (the upper end surface 61e) with the inner receiving recess 27c. Combine (bayonet engagement). As a result, in the tilt adjustment member 61, the lower end surface 61f of the main body column portion 61a is directed to the outer receiving recess 27b and the upper end surfaces 61e of both engagement piece portions 61c are inward in the tilting engagement hole 27. It is addressed to the receiving recess 27c, and the engagement rib portion 27d of the tilting engagement hole 27 is sandwiched and prevented from falling off.

  Next, among the three alignment through holes 26b, as shown in FIG. 2B, the fifth lens support holes 26b are respectively provided in the two alignment through holes 26b adjacent to each other. An eccentricity adjusting screw 62 is assembled from the outside of the frame 26. As shown in FIG. 8, the eccentric adjustment screw 62 accepts the main body column portion 61a of the tilt adjustment member 61 at the inner hole portion 62a, and the inner peripheral wall surface of the alignment through hole 26b. By being screwed into the screw groove, the core is incorporated into the alignment through hole 26b. At this time, the two eccentricity adjusting screws 62 are appropriately moved to the photographing optical axis OA side in the hole axis BA direction within the alignment through hole 26b by adjusting the screwing amount (advancement / retraction amount according to the screw pitch), and the bottom surface. 62 b is brought into contact with the contact protrusion 28 of the peripheral wall 25 b of the fifth lens holding frame 25. Thereby, both the eccentric adjustment screws 62 hold the tilt adjustment member 61 so as to be rotatable so that the center axis CA coincides with the hole axis BA of the alignment through hole 26b. For this reason, the eccentric adjustment screw 62 and the tilt adjustment member 61 are rotatably integrated with each other on the hole axis BA in the two alignment through holes 26b adjacent to the contact protrusion 28.

  On the other hand, as shown in FIG. 2B, among the three alignment through-holes 26b, the remaining one alignment through-hole 26b that is not adjacent to the contact protrusion 28 is supported by the fifth lens. An eccentricity adjustment fixing screw 63 and a compression spring 64 are assembled from the outside of the frame 26. As shown in FIG. 9, the eccentric adjustment fixing screw 63 receives the main body column portion 61a of the tilt adjustment member 61 at the inner hole portion 63c in a state where the compression spring 64 is disposed so as to surround the small diameter portion 63b. The screw groove on the outer peripheral wall surface of the large-diameter portion 63a is screwed into the screw groove on the inner peripheral wall surface of the alignment through hole 26b to be incorporated into the alignment through hole 26b. Thereby, the eccentric adjustment fixing screw 63 rotatably holds the tilt adjustment member 61 so that the center axis CA coincides with the hole axis BA of the alignment through hole 26b. For this reason, the eccentric adjustment fixing screw 63, the compression spring 64, and the tilt adjustment member 61 are incorporated on the hole axis BA so as to be rotatable relative to the remaining one alignment through hole 26b. The eccentric adjustment fixing screw 63 has one end 64 a in contact with the lower surface 63 e of the large-diameter portion 63 a of the eccentric adjustment fixing screw 63 and the other end 64 b in the fifth lens holding frame 25. The compression spring 64 that contacts the outer peripheral surface of the peripheral wall portion 25b is positioned and fixed at a position where the compression spring 64 is appropriately compressed. In the compression spring 64, the biasing direction (stretching direction) is set to the hole axis BA direction by the small diameter portion 63b of the eccentricity adjusting fixing screw 63.

  Thus, the fifth lens holding frame 25 can be assembled in the fifth lens support frame 26 via the lens alignment mechanism 60 (see FIG. 2A). In this support structure, the bottom surfaces 62b of the two eccentricity adjusting screws 62 assembled so as to be able to advance and retract in the direction of the hole axis BA in the alignment through hole 26b are in contact with the peripheral wall portion 25b of the fifth lens holding frame 25. It is in contact with the protrusion 28. Further, the other end 64b of the compression spring 64 compressed by abutting one end 64a against the lower surface 63e of the large diameter portion 63a of the eccentric adjustment fixing screw 63 fixed in the alignment through hole 26b is the fifth lens. The holding frame 25 is in contact with the outer peripheral surface of the peripheral wall portion 25b. For this reason, the fifth lens holding frame 25 is viewed in the direction orthogonal to the photographing optical axis OA (the radial direction with respect to the photographing optical axis OA), and the bottom surfaces 62b of the two eccentric adjustment screws 62 and the other end of the compression spring 64. 64b.

  Further, in this support structure, the tilt adjusting member 61 (its main body column portion 61a) is connected to the central axis CA by the two eccentric adjustment screws 62 or the eccentric adjustment fixing screws 63 in the three alignment through holes 26b. It is held so as to be rotatable about the hole axis BA that is aligned with the hole axis BA. Each tilt adjustment member 61 is provided with an eccentric shaft portion 61b having an eccentric axis EA that is eccentric from the central axis CA of the main body column portion 61a, and the eccentric shaft portion 61b is engaged for tilting. It is located inward of the engagement rib portion 27 d of the hole 27. Further, the fifth lens holding frame 25 has a photographing optical axis OA by a wave washer 65 provided between the rear end surface 25c (the rear end surface of the peripheral wall portion 25b) and the support rib 26c of the fifth lens support frame 26. When viewed in the direction, each centering through hole 26b is biased toward the tip end side (subject side). Therefore, the fifth lens holding frame 25 is connected to each of the tilting engagement holes 27 (thereof) with respect to the eccentric shaft portion 61b of the tilt adjustment member 61 provided on the hole axis BA of each of the alignment through holes 26b. The engagement rib portion 27d) is biased so as to move to the subject side (front end side). As a result, in the tilt adjusting member 61 provided on the hole axis BA of each alignment through hole 26b, the outer peripheral surface located on the image plane side of the eccentric shaft portion 61b is engaged with each tilt engagement hole 27. The joint rib portion 27d comes into contact with the inner peripheral surface on the object side. For this reason, the fifth lens holding frame 25 sees in the photographic optical axis OA direction, and each alignment center through-hole of the fifth lens support frame 26 passes through the engagement rib portion 27d of each tilting engagement hole 27. It will be supported by the eccentric shaft part 61b of each tilt adjustment member 61 assembled | attached to the hole 26b.

  Further, in this support structure, the main body column portion 61a of the tilt adjustment member 61 is aligned with the center axis CA by the two eccentricity adjustment screws 62 or the eccentricity adjustment fixing screw 63 in each alignment through hole 26b. It is held so as to be rotatable about the hole axis BA around the hole axis BA. Each tilt adjusting member 61 is provided with an eccentric shaft portion 61b having an eccentric axis EA that is eccentric from the central axis CA of the main body column portion 61a. Therefore, each tilt adjustment member 61 held by the eccentric adjustment screw 62 or the eccentric adjustment fixing screw 63 in each alignment through hole 26b is moved around the hole axis BA of each alignment through hole 26b, that is, the main body column. When rotating around the central axis CA of the part 61a, the eccentric shaft 61b (its eccentric axis EA) is displaced so as to circulate around the hole axis BA (central axis CA). Accordingly, by rotating each tilt adjusting member 61 in each alignment through hole 26b, each eccentric through hole 26b (the hole axis BA), that is, the eccentric shaft portion with respect to the fifth lens support frame 26 is obtained. The position of 61b in the direction of the photographic optical axis OA can be changed.

  In this support structure, as described above, in the engagement rib portion 27d of each tilting engagement hole 27 of the fifth lens holding frame 25 urged by the wave washer 65 in the fifth lens support frame 26, When the eccentric shaft portion 61b of each tilt adjustment member 61 assembled in each alignment through hole 26b of the five lens support frame 26 comes into contact, the fifth lens holding frame 25 adjusts each adjustment in the photographic optical axis OA direction. The movement to the core through hole 26b side is restricted. The eccentric shaft portion 61b is rotated by the tilt adjusting member 61 in each alignment through-hole 26b, so that each alignment through-hole 26b (its hole axis BA), that is, the fifth lens support frame 26. The position in the direction of the photographic optical axis OA changes with respect to. Thus, by rotating the tilt adjustment member 61 in each alignment through hole 26b, the fifth lens holding frame 25 is moved toward the subject side by the eccentric shaft portion 61b when viewed in the photographing optical axis OA direction. Since the restriction position can be changed, the three support points of the fifth lens holding frame 25 within the fifth lens support frame 26 can be adjusted in the direction of the photographing optical axis OA. Therefore, by appropriately rotating the tilt adjusting member 61 in each of the alignment through holes 26b, the fifth lens holding frame 25, that is, the fifth lens group 15 with respect to the photographing optical axis OA in the fifth lens support frame 26. The tilt can be adjusted. At this time, in each tilt adjustment member 61, since the slit groove 61d is provided at the tip of the main body column part 61a, by inserting the tip of an adjustment jig such as a very small screwdriver into the slit groove 61d, It is supposed that the rotation operation is easy. For this reason, in the present embodiment, the three tilt adjusting members 61 enable tilt adjustment by displaceable the support point of the fifth lens holding frame 25 with respect to the fifth lens support frame 26 in the direction of the photographing optical axis OA. It functions as a tilt adjustment member.

  In this support structure, as described above, the fifth lens holding frame 25 is viewed in the fifth lens support frame 26 in a direction perpendicular to the photographing optical axis OA, that is, in a radial direction with respect to the photographing optical axis OA. The two eccentricity adjusting screws 62 are supported by the bottom surface 62 b and the other end 64 b of the compression spring 64. The two eccentricity adjusting screws 62 are assembled in the centering through hole 26b so as to be movable in the direction of the hole axis BA by rotating around the hole axis BA, and the compression spring 64 is disposed in the centering through hole 26b. The urging direction (stretching direction) is the hole axis BA direction while being compressed by the eccentric adjustment fixing screw 63 fixed to the hole. For this reason, by rotating the two eccentricity adjusting screws 62 in each alignment through-hole 26b, the direction of the hole axis BA by each bottom surface 62b, that is, the imaging optical axis OA as viewed in the direction orthogonal to the imaging optical axis OA. The support position in the radial direction with respect to can be changed, and the compression spring 64 is appropriately expanded and contracted accordingly, whereby the support position in the hole axis BA direction (radial direction with respect to the photographing optical axis OA) by the other end 64b is changed. Therefore, the three support points of the fifth lens holding frame 25 in the fifth lens support frame 26 can be adjusted in the direction orthogonal to the photographing optical axis OA. Therefore, by appropriately rotating the two eccentricity adjusting screws 62 in each of the alignment through holes 26b, the photographing light of the fifth lens holding frame 25, that is, the fifth lens group 15 is provided in the fifth lens support frame 26. The position (eccentric position) with respect to the axis OA can be adjusted. At this time, since the two eccentricity adjusting screws 62 are provided with the slit groove 62c at the tip, the rotation operation can be performed by inserting the tip of an adjustment jig such as a very small screwdriver into the slit groove 62c. It is supposed to be easy. If necessary, the urging force of the compression spring 64 can be adjusted by appropriately rotating the eccentricity adjusting fixing screw 63 in the alignment through hole 26b. The support position by the other end 64b of the compression spring 64 can also be changed. Since the eccentric adjustment fixing screw 63 is also provided with a slit groove 63d at the tip, it can be easily rotated by inserting the tip of an adjustment jig such as a very small screwdriver into the slit groove 63d. It is said that. For this reason, in this embodiment, the two eccentric adjustment screws 62, the eccentric adjustment fixing screw 63, and the compression spring 64 are provided on the photographing optical axis OA of the fifth lens holding frame 25 with respect to the fifth lens support frame 26. It functions as an eccentricity adjustment member that can adjust the eccentricity by allowing the support point in the orthogonal direction (radial direction with respect to the photographing optical axis OA) to be displaced.

  Next, an example in which the camera (imaging device) 100 is configured by adopting the optical system device including the lens barrel 10 shown in the above-described embodiment as a photographing optical system will be described with reference to FIGS. . FIG. 10 is a perspective view showing the appearance of the camera 100 as seen from the front side that is the object, that is, the subject side, and FIG. 11 is a perspective view showing the appearance of the camera 100 as seen from the back side that is the photographer side. FIG. 12 is a block diagram illustrating a functional configuration of the camera 100. Although the camera 100 is described here, a camera in which a camera function is incorporated in a portable information terminal device such as a so-called PDA (personal data assistant) or a mobile phone has recently appeared.

  Many of such portable information terminal devices have functions and configurations substantially the same as those of the camera 100, although the appearance is slightly different, and the lens according to the present invention is included in such a portable information terminal device. An optical system device including the lens barrel 10 may be employed. Similarly, an optical system apparatus including the lens barrel 10 according to the present invention may be employed in the image input apparatus.

  As shown in FIGS. 10 and 11, the camera 100 includes a photographing lens 101, a shutter button 102, a zoom lever 103, a finder 104, a strobe 105, a liquid crystal monitor 106, an operation button 107, a power switch 108, a memory card slot 109, and communication. A card slot 110 and the like are provided. Further, as shown in FIG. 12, the camera 100 also includes a light receiving element 201, a signal processing device 202, an image processing device 203, a central processing unit (CPU) 204, a semiconductor memory 205, a communication card 206, and the like. Further, although not clearly shown in the drawings, these units operate by being supplied with power from a battery as a driving power source.

  The camera 100 includes a photographing lens 101 and a light receiving element 201 as an area sensor such as a CCD (charge coupled device) imaging element, and is a photographing target formed by the photographing lens 101 that is a photographing optical system. An image of an object, that is, a subject is read by the light receiving element 201. As the photographing lens 101, an optical system apparatus including the lens barrel 10 according to the present invention as described in the present embodiment is used. Specifically, an optical system apparatus is configured using a lens or the like that is an optical element that configures the lens barrel 10 (for example, the light receiving element 201 is configured using the solid-state imaging device 17 (see FIG. 2)). The lens barrel 10 has a mechanism for holding each lens or the like so that the lens can be moved at least for each lens group. The photographing lens 101 incorporated in the camera 100 is usually incorporated in the form of this optical system device.

  Here, in FIG. 10, the optical system apparatus (lens barrel 10) is housed (collapsed) in the housing in the housed state shown in FIG. (For example, the fixed barrel 31 (see FIG. 1) of the lens barrel 10) may protrude from the housing. The lens barrel 10 may be configured to be detachable from the housing together with the solid-state imaging device 17 and the low-pass filter 18 (see FIG. 1). The solid-state imaging device 17 and the low-pass filter 18 (see FIG. 1). In addition to (see), the structure may be detachable from the housing.

  The output of the light receiving element 201 is processed by the signal processing device 202 controlled by the central processing unit 204 and converted into digital image information. The image information digitized by the signal processing device 202 is subjected to predetermined image processing in the image processing device 203 which is also controlled by the central processing unit 204 and then recorded in the semiconductor memory 205 such as a nonvolatile memory. In this case, the semiconductor memory 205 may be a memory card loaded in the memory card slot 109 or a semiconductor memory built in the camera body. The liquid crystal monitor 106 can display an image being photographed, or can display an image recorded in the semiconductor memory 205. The image recorded in the semiconductor memory 205 can also be transmitted to the outside via a communication card 206 or the like loaded in the communication card slot 110.

  When the camera 100 is carried, the photographing lens 101 is in the retracted state D (see FIG. 2A) and is buried in the body of the camera 100 as shown in FIG. When the user operates the power switch 108, the power is turned on, and the lens barrel is extended as shown in FIG. 10B, and protrudes from the body of the camera 100 to enter the photographing state P (see FIG. 2B). And At this time, when the first lens group 11 to the fifth lens group 15 constitute a zoom lens having a variable focal length, the optical system of each group constituting the zoom lens is arranged inside the lens barrel 10 of the photographing lens 101. For example, the zoom lens 103 is disposed at a wide-angle position, and by operating the zoom lever 103, the layout of each group optical system is changed, and the zooming operation to the telephoto end can be performed. It is desirable that the optical system of the finder 104 is also scaled in conjunction with the change in the angle of view of the photographing lens 101.

  In many cases, focusing is performed by half-pressing the shutter button 102. When the shutter button 102 is further pushed down to the fully depressed state, photographing is performed, and then the processing as described above is performed.

  When the image recorded in the semiconductor memory 205 is displayed on the liquid crystal monitor 106 or transmitted to the outside via the communication card 206 or the like, the operation button 107 is operated in a predetermined manner. The semiconductor memory 205 and the communication card 206 are used by being loaded into dedicated or general-purpose slots such as the memory card slot 109 and the communication card slot 110, respectively.

  In the lens barrel 10 of this embodiment, an eccentricity adjusting member (two offsets) as a lens alignment mechanism 60 for adjusting the eccentricity and tilting of the fifth lens holding frame 25 with respect to the fifth lens support frame 26. The center adjustment screw 62, the eccentric adjustment fixing screw 63, and the compression spring 64) and the tilt adjustment member (three tilt adjustment members 61) rotate relative to each other through the alignment through holes 26b of the fifth lens support frame 26. Since it is incorporated on the same axis (hole axis BA) as possible, the eccentricity adjustment and the inclination adjustment can be performed independently of each other while the arrangement space for the eccentricity adjustment member and the inclination adjustment member is halved. . In other words, the member (configuration) for adjusting the eccentricity and the member (configuration) for adjusting the tilt can be efficiently arranged.

  In the lens barrel 10, the inner hole portion 62 a of the two eccentricity adjustment screws 62 and the inner hole portion 63 c of the eccentricity adjustment fixing screw 63 are rotatably fitted to the main body column portion 61 a of the tilt adjustment member 61. Therefore, in each of the alignment through holes 26b, the eccentricity adjustment member and the inclination adjustment member can be incorporated on the same axis (hole axis BA) while enabling the eccentricity adjustment and the inclination adjustment. it can. For this reason, it can be set as a smaller and simple structure.

  Further, in the lens barrel 10, the three tilt adjustment members 61 as tilt adjustment members are provided in the fifth lens holding frame 25 in the direction of the photographing optical axis OA due to the change of the rotation posture in each alignment through hole 26 b. Since the position of the eccentric shaft portion 61b (the outer peripheral surface thereof) serving as a support point is changed, the fifth lens holding frame 25, that is, the fifth lens group is rotated by rotating each tilt adjustment member 61. Since the inclination of 15 can be adjusted, it is possible to adjust the inclination of the fifth lens group 15 with a simple configuration.

  In the lens barrel 10, three tilt adjusting members 61 as tilt adjusting members displace the eccentric shaft portion 61 b from the main body column portion 61 a held rotatably around the hole axis BA of each alignment through hole 26 b. Since the configuration is decentered, the amount of change in the photographing optical axis OA direction of the fifth lens group 15 with respect to the rotational operation amount of the tilt adjustment member 61 is made minute while making the configuration smaller and simpler. Since the gradual change can be made, the inclination of the fifth lens group 15 can be adjusted with higher accuracy.

  In the lens barrel 10, the fifth lens holding frame 25 is positioned in the alignment lens through-hole 26 b side (front end side (subject side)) when viewed in the photographing optical axis OA direction within the fifth lens support frame 26 by the wave washer 65. Therefore, the support position of the fifth lens holding frame 25, that is, the fifth lens group 15 in the photographing optical axis OA direction with respect to the fifth lens support frame 26 is more appropriately adjusted. Can do.

  In the lens barrel 10, the eccentricity adjusting screw 62 as an eccentricity adjusting member is changed in a direction (diameter with respect to the imaging optical axis OA) perpendicular to the imaging optical axis OA due to a change in the rotational posture in each alignment through hole 26 b. Direction), the position of the bottom surface 62b serving as a support point for the fifth lens holding frame 25 (the contact protrusion 28 of the peripheral wall 25b) is changed. By doing so, the decentering position of the fifth lens holding frame 25, that is, the fifth lens group 15 can be adjusted, so that the decentering adjustment of the fifth lens group 15 can be performed with a simple configuration.

  In the lens barrel 10, since the eccentricity adjustment fixing screw 63 and the compression spring 64 are used as the eccentricity adjusting member, the fifth lens holding frame 25 (of the peripheral wall portion 25b) by the two eccentricity adjusting screws 62 is used. The eccentric position of the fifth lens holding frame 25, that is, the fifth lens group 15, is simply changed in the direction perpendicular to the photographing optical axis OA (the radial direction with respect to the photographing optical axis OA). Can be adjusted, and the work for adjusting the eccentricity can be simplified.

  In the lens barrel 10, the eccentricity adjusting screw 62 as an eccentricity adjusting member is configured to screw the screw groove on the outer peripheral wall surface into the screw groove on the inner peripheral wall surface of each alignment through hole 26b. Therefore, while making the configuration smaller and simpler, the change amount in the direction orthogonal to the photographing optical axis OA of the fifth lens group 15 with respect to the rotation operation amount of the eccentricity adjusting screw 62 is made minute while gradually changing. Therefore, the eccentric position of the fifth lens group 15 can be adjusted with higher accuracy.

  In the lens barrel 10, the fifth lens holding frame 25 is moved by a compression spring 64 to a support point by two eccentric adjustment screws 62 when viewed in a direction orthogonal to the photographing optical axis OA in the fifth lens support frame 26. Since the bias is always applied, the support position of the fifth lens holding frame 25, that is, the fifth lens group 15 in the direction orthogonal to the photographing optical axis OA with respect to the fifth lens support frame 26 is adjusted more appropriately. Can do.

  In the lens barrel 10, the fifth lens support frame 26 holding the fifth lens holding frame 25 (fifth lens group 15) so as to be adjustable with high accuracy can be assembled as the lens barrel 10, so that higher imaging is possible. Performance can be obtained. In other words, in the lens barrel 10, the fifth lens support frame 26 that holds the fifth lens group 15 that is accurately aligned by the fifth lens holding frame 25 and the lens alignment mechanism 60 is incorporated as it is as an imaging optical system. Therefore, higher imaging performance can be obtained.

  In the lens barrel 10, since the fifth lens holding frame 25 that holds the fifth lens group 15 is held by the lens alignment mechanism 60 in the fifth lens support frame 26 so as to be adjustable. Since the position and posture of the fifth lens holding frame 25 within the fifth lens support frame 26 can be adjusted by the alignment mechanism 60, the fifth lens group 15 can be aligned with a simple configuration.

  In the lens barrel 10, the eccentricity adjustment of the fifth lens holding frame 25, that is, the fifth lens group 15 is performed while maintaining the state supported by the eccentricity adjusting member and the tilt adjusting member in the fifth lens support frame 26. Since tilt adjustment (alignment) can be performed, it is not necessary to fix the fifth lens group 15 with high accuracy since it is not necessary to fix the alignment state with an adhesive or the like after the alignment operation is completed. An imaging optical system can be obtained. In other words, in the lens barrel 10, the holding state of the fifth lens holding frame 25 (the fifth lens group 15) can be adjusted in the fifth lens support frame 26, so that the lens barrel 10 is aligned with high accuracy. An imaging optical system can be obtained.

  In the lens barrel 10, in each of the alignment through-holes 26b, the tip of the eccentric adjustment screw 62 is positioned more than the tip of the tilt adjustment member 61 (tip position of the slit groove 61d) received by the inner hole portion 62a. Since the bottom of the slit groove 62c is located on the upper side (outside in the radial direction with respect to the photographing optical axis OA), the eccentric adjustment screw 62 can be rotated without interfering with the tilt adjustment member 61. .

  In the lens barrel 10, in each of the alignment through holes 26b, the tip of the eccentric adjustment fixing screw 63 is located more than the tip of the tilt adjustment member 61 (the tip position of the slit groove 61d) received by the inner hole portion 63c. Since the bottom of the slit groove 63d is located on the upper side (outside in the radial direction with respect to the photographing optical axis OA), the eccentric adjustment fixing screw 63 can be rotated without interfering with the tilt adjustment member 61. it can.

  In the lens barrel 10, the three tilt adjustment members 61 are rotatably fitted to the inner hole portion 62 a of the two eccentricity adjustment screws 62 and the inner hole portion 63 c of the eccentricity adjustment fixing screw 63. Since the slit groove 61d is provided at the tip, the tilt adjustment member 61 can be rotated without interfering with the eccentric adjustment screw 62 and the eccentric adjustment fixing screw 63.

  In the lens barrel 10, the three tilt adjustment members 61, the two eccentric adjustment screws 62, and the eccentric adjustment fixing screw 63 can be rotated without interfering with each other. Alignment work can be performed independently of each other with a smaller and simpler configuration, and eccentricity adjustment and tilt adjustment can be performed independently of each other.

  Therefore, in the lens barrel 10 according to the present invention, it is possible to reduce the arrangement space while enabling eccentricity adjustment and tilt adjustment.

  In the above-described embodiments, the lens barrel 10 as an example of the lens barrel according to the present invention has been described. However, a lens holding frame that holds a lens group including at least one lens, and the lens holding frame. A support frame for supporting the lens group on the inner side, wherein the support frame surrounds the lens optical axis of the lens group and extends toward the lens optical axis. A centering through hole is provided, and each centering through hole has an eccentricity adjusting member that can displace a support point in a direction perpendicular to the lens optical axis of the lens holding frame with respect to the support frame; Any tilting adjustment member that can displace a support point in the lens optical axis direction of the lens holding frame with respect to the support frame may be a lens barrel that is incorporated coaxially. Limited No.

  In the embodiment, the alignment operation of the fifth lens holding frame 25, that is, the fifth lens group 15 in the fifth lens support frame 26 is performed before the assembly. However, the lens alignment mechanism 60 temporarily assembled is used. After the fifth lens support frame 26 supporting the fifth lens holding frame 25 is assembled together with the first lens group 11 to the fourth lens group 14 to form the lens barrel 10, the fifth lens group 15 The alignment work may be performed. In this case, a subject (not shown) is arranged at a predetermined distance on the photographing optical axis OA, and is imaged by the imaging optical system including the first lens group 11 to the fifth lens group 15, and the state of the subject image The three tilt adjustment members 61 and the two eccentric adjustment screws 62 are appropriately rotated while observing the above. A position where the subject image is in an appropriate state is an appropriate position of the fifth lens group 15 with respect to the first lens group 11 to the fourth lens group 14. Thereby, the alignment operation of the fifth lens group 15 from the first lens group 11 to the fourth lens group 14 is completed.

  Furthermore, in the above-described embodiment, the fifth lens group 15 is configured to be able to be aligned, but other lens groups (for example, the fourth lens group 14) may be used. It is not limited.

  In the above-described embodiments, the imaging optical system is configured by using the first lens group 11 to the fourth lens group 14 in addition to the fifth lens group 15 that is aligned with high accuracy. As long as the lens holding frame includes a lens group configured to be supported by the support frame so that the lens holding frame can be aligned via the core mechanism, the lens holding frame may have another lens group and is limited to the above-described embodiments. Is not to be done.

  In the embodiment described above, the tilt adjustment member 61 is provided with the slit groove 61d, the eccentric adjustment screw 62 is provided with the slit groove 62c, and the eccentric adjustment fixing screw 63 is provided with the slit groove 63d. What is necessary is just to enable engagement of a jig (tool) for the rotation operation, and it is not limited to the above-described embodiment.

  In the above-described embodiment, the fifth lens support frame 26 is provided with the three alignment through holes 26b in order to incorporate the eccentricity adjusting member and the tilt adjusting member. It is possible to incorporate the members on the same axis as long as at least three members are provided, and the present invention is not limited to the above-described embodiments.

  As described above, the photographing apparatus of the present invention has been described based on the embodiments. However, the specific configuration is not limited to the embodiments, and design changes and additions are allowed without departing from the gist of the present invention. The

10 Lens barrel 11 First lens group (as second lens group) 12 Second lens group (as second lens group) 13 Third lens group (as second lens group) 14 (Second A fourth lens group 15 (as a lens group (first lens group)) a fifth lens group 21 (as a lens barrel) 22 a rectilinear barrel 22 (as a second lens holding frame) 2 lens holding frame 23 (third lens holding frame) third lens holding frame 24 (second lens holding frame) fourth lens holding frame 25 (lens holding frame (first lens holding frame) Of the fifth lens holding frame 26 (as a support frame) fifth lens support frame 26b alignment through hole 31 (as a lens barrel) fixed cylinder 32 (as a lens barrel) first rotating cylinder 33 Second round (as a lens barrel) Roller 34 34 Linear liner (as a lens barrel) 61 Tilt adjusting member 61b Eccentric shaft portion 62 Eccentric adjusting screw 62a (as an eccentric adjusting member) Inner hole portion 63 (as a hollow portion) (Eccentric adjustment) Eccentric adjustment fixing screw 63c (as a member) Inner hole portion 64 (as a hollow portion) Compression spring 65 (as an eccentricity adjusting member) Wave washer (as an urging member in the optical axis direction) 100 Camera OA Imaging optical axis BA hole axis

JP 2007-219405 A

Claims (11)

A lens barrel comprising: a lens holding frame that holds a lens group composed of at least one lens; and a support frame that supports the lens holding frame on the inside,
The support frame is provided with at least three alignment through holes so as to extend toward the lens optical axis while surrounding the lens optical axis of the lens group,
In each of the alignment through-holes, an eccentricity adjusting member capable of displacing a support point in a direction orthogonal to the lens optical axis of the lens holding frame with respect to the support frame, and the lens holding frame with respect to the support frame And a tilt adjusting member capable of displacing a support point in the optical axis direction of the lens.   At least two of the eccentricity adjusting members are arranged in the hole axis direction so as to displace the support point in the hole axis direction in accordance with rotation around the hole axis line of the alignment through hole in the alignment through hole. 2. The lens barrel according to claim 1, wherein at least one of the lens holding frames can be urged inward in the axial direction of the hole in the alignment through hole. .   Each of the eccentricity adjusting members is arranged in the direction of the hole axis so as to displace the support point in the direction of the hole axis along with the rotation around the hole axis of the centering through hole. The lens barrel according to claim 1, wherein the lens barrel is advanceable and retreatable. The tilt adjustment member is provided with an eccentric shaft portion that extends in the hole axial direction of the alignment through-hole and is eccentric from the hole axis in each of the alignment through-holes. ,
The tilt adjustment member is capable of rotating around the hole axis in each alignment through-hole, and capable of contacting the eccentric shaft portion with the lens holding frame in the lens optical axis direction. The lens barrel according to any one of claims 1 to 3, wherein the lens barrel is formed.   The optical axis direction urging member for urging the lens holding frame toward the eccentric shaft part in the lens optical axis direction is provided on the support frame. Lens barrel. Each of the eccentric adjustment members has a cylindrical shape that can be fitted into the alignment through-hole,
The lens barrel according to any one of claims 1 to 5, wherein each of the tilt adjustment members can be fitted into a hollow portion of each of the eccentricity adjustment members. The lens barrel according to any one of claims 1 to 6,
The lens group is a first lens group, the lens holding frame is a first lens holding frame,
Furthermore, a second lens group composed of at least one lens, a second lens holding frame that holds the second lens group, and the support frame and the second lens holding frame can be moved inside. And a lens barrel that is held by the lens barrel.   An image pickup apparatus using the lens barrel according to claim 1.   A digital camera using the lens barrel according to any one of claims 1 to 7.   A portable information terminal device using the lens barrel according to any one of claims 1 to 7.   An image input apparatus using the lens barrel according to any one of claims 1 to 7.