JP5272579B2 - Lens barrel and imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel where flexibility in design is improved. <P>SOLUTION: The lens barrel includes a cylindrical fixed barrel (60), a first cam barrel (71) engaging with the fixed barrel (60) and rotatable with respect to the fixed barrel (60), a second cam barrel (73) engaging with the fixed barrel (60) on the opposite side to the first cam barrel (71) and rotatable with respect to the fixed barrel (60), and an interlocking member (90) that is arranged adjacent to an end of the fixed barrel (60) and interlocks the first cam barrel (71) with the second cam barrel (73). <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a lens barrel and an imaging apparatus that include a plurality of lens groups and that move in the optical axis direction by a zooming operation.

2. Description of the Related Art Conventionally, a lens barrel attached to a camera has a fixed barrel that is fixed to the camera, a cam barrel that rotates relative to the fixed barrel, and an optical axis that is rotated by the cam barrel. A plurality of lens groups moving in the direction are provided (for example, see Patent Document 1).
JP 2000-89086 A

  Such a lens barrel has various design restrictions in order to ensure optical performance.

  An object of the present invention is to provide a lens barrel having improved design freedom.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

The invention according to claim 1 is characterized in that the cylindrical fixed tube (60), the first cam tube (71) rotatable with respect to the fixed tube (60), and the fixed tube (60) A second cam cylinder (73) that is fitted to the opposite side of the one cam cylinder (71) and is rotatable with respect to the fixed cylinder (60), and adjacent to an end of the fixed cylinder (60) And an interlocking member (90) that interlocks the first cam cylinder (71) and the second cam cylinder (73), and is movable with respect to the fixed cylinder by fitting into the fixed cylinder. The fixed cylinder has a linear rectilinear groove, and includes a moving piece having a rectangular rectilinear fitting portion that engages with the rectilinear groove and moves along the rectilinear groove, The second cam cylinder has a cam groove, and the moving piece is provided in the moving cylinder, and a cam follower that engages with the cam groove is integrated. The second cam cylinder rotates to move the movable cylinder, and the linear fitting portion has a longitudinal direction that coincides with a movement direction of the linear groove, and a short side direction of the linear groove. It is arrange | positioned so that it may correspond to the width direction, and the said cam follower is provided in the edge part by the side of the image surface of the said lens barrel of the said linear fitting part, The lens barrel (1) characterized by the above-mentioned .
The invention described in 請 Motomeko 2 is the lens barrel according to claim 1 (1), the first lens group and (L1), and a second lens group, the first lens group the first changes the distance between the second lens group by the rotation of the cam barrel (71), said interlocking member (90), the spacing of the first and second lens group (L2) is the shortest In this state, the lens barrel (1) is positioned closest to the end of the fixed barrel (60).
The invention of claim 3 is the lens barrel according to claim 2 (1), the first lens holding frame (11) and the second lens group holding said first lens unit (L1) A lens characterized in that an interval between the second lens holding frame (20) holding (L2) is narrower than an interval between the first lens group (L1) and the second lens group (L2). The lens barrel (1).
According to a fourth aspect of the present invention, in the lens barrel (1) according to the third aspect , the second lens holding frame (20) extends over the entire circumference of the outer periphery of the second lens holding frame (20). The first lens holding frame (11) has a protrusion (12A) facing the flange (23B) from the first lens holding frame (11). This is a lens barrel (1).
The invention of claim 5 is the lens barrel according to any one of claims 1 to 4 (1), said first lens unit (L1) and the second lens group and (L2) The lens barrel (1) is characterized in that the interval can be shortened to a state where an image cannot be formed at a predetermined position.
A sixth aspect of the present invention is an imaging apparatus (200) including the lens barrel (1) according to any one of the first to fifth aspects.
Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  According to the present invention, it is possible to provide a lens barrel with improved design freedom.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings and the like.
FIG. 1 is a cross-sectional view along the optical axis X of the lens barrel 1 to which the first embodiment of the present invention is applied, and shows a state on the wide-angle side where the lens barrel 1 is shortened. FIG. 2 is a cross-sectional view of the lens barrel 1 in a state zoomed from the side of FIG. 1 to the telephoto side.

  A lens barrel 1 shown in FIGS. 1 and 2 is a so-called zoom lens capable of continuously changing a focal length, and includes a first lens group L1, a second lens group L2, a third lens group L3, and a third lens group L3. A photographic optical system including five lens groups, a four lens group L4 and a fifth lens group L5, is provided. The first lens unit L1 to the fifth lens unit L5 are movably held independently by a fixed cylinder 60 fixed to the camera 200 with the lens barrel 1 mounted on the camera 200. Yes. The focal length of the lens barrel 1 is changed by the movement of the first lens unit L1 to the fifth lens unit L5.

The fixed tube 60 is formed integrally with the base tube portion 2 of the lens barrel 1, and has a lens mount 3 at its base end (right end in the figure). The lens barrel 1 is detachably attached to the camera 200 via the lens mount 3.
In the following description, unless otherwise specified, the movement in the direction parallel to the optical axis X of the photographing optical system with reference to the fixed cylinder 60 is referred to as “straight forward”, and the rotation around the optical axis X is referred to as “rotation”. Called. In addition, the direction parallel to the optical axis X of the photographing optical system is referred to as “front / rear”, the lens mount 3 side is referred to as “rear” (image plane side), and the other end side is referred to as “front” (object side).

Hereinafter, the configuration and operation of each part of the lens barrel 1 will be described.
The lens barrel 1 has a cylindrical shape as a whole, and a zoom operation ring 4 is disposed on the outer periphery on the tip side. In a state in which the lens barrel 1 shown in FIG. 1 is shortened, on the inner peripheral side of the zoom operation ring 4, a first group cylinder 10 that holds the first lens group L 1, a zoom drive cylinder 71, a zoom guide cylinder 72, and The second lens moving frame 20 that holds the second lens unit L2 is arranged in order from the outer peripheral side. Further, a cam ring 73 is disposed on the inner peripheral side of the fixed cylinder 60, and a third lens group L3, a fourth lens group L4, and a fifth lens group L5 are disposed on the inner peripheral side thereof.

The zoom operation ring 4 is provided on the outer periphery of the lens barrel 1 so as to be rotatable and immovable in the front-rear direction, and a non-slip rubber layer is provided on the peripheral surface thereof.
The zoom operation ring 4 and the zoom driving cylinder 71 located on the inner peripheral side thereof are connected to each other via a driving force transmission pin 81 so as to be interlocked with each other. That is, the driving force transmission pin 81 projecting from the outer surface of the rear end portion of the zoom driving cylinder 71 is engaged with the operation groove 4 a parallel to the optical axis X formed on the inner peripheral surface of the zoom operation ring 4. The zoom drive cylinder 71 is rotationally driven in conjunction with the rotation of the zoom operation ring 4. The driving force transmission pin 81 can move in the direction along the operation groove 4a (the optical axis X direction, that is, the front-rear direction). Therefore, the zoom drive cylinder 71 can move in the front-rear direction with respect to the zoom operation ring 4 (straight forward). Possible).

  The zoom drive cylinder 71 is linked to the first group cylinder 10 via a cam pin 82 so as to be interlocked. That is, the cam pin 82 planted on the inner surface of the rear end portion of the first group cylinder 10 is engaged with the cam groove 71 a formed in the zoom drive cylinder 71, and the first group cylinder is rotated by the rotation of the zoom drive cylinder 71. 10 is driven to move in the front-rear direction.

  Further, the zoom drive cylinder 71 is connected to a cam ring 73 disposed inside the fixed cylinder 60 via a rotary connecting member 90. That is, the rotation connecting member 90 provided on the cam ring 73 is engaged with a rectilinear groove 71 b parallel to the optical axis X formed on the zoom drive cylinder 71, and the cam ring 73 is rotated as the zoom drive cylinder 71 rotates. It is designed to rotate.

  The rotation connecting member 90 is engaged with the rectilinear groove 71 b of the zoom drive cylinder 71 through a cam groove 72 a formed through the zoom guide cylinder 72 located on the inner peripheral side of the zoom drive cylinder 71. The zoom drive cylinder 71 is provided so as to be relatively rotatable with respect to the zoom guide cylinder 72 disposed on the inner peripheral side (between the zoom drive cylinder 71 and the fixed cylinder 60) and not to be relatively movable in the front-rear direction. It has been. The rotation connecting member 90 will be described in detail later.

  The zoom guide tube 72 includes a moving piece 100 at an end on the rear side thereof, and the moving piece 100 is engaged with a rectilinear groove 61 parallel to the optical axis X formed in the fixed tube 60. . Accordingly, the zoom guide tube 72 is provided so as not to rotate with respect to the fixed tube 60 and to be movable in the front-rear direction.

The rectilinear groove 61 of the fixed cylinder 60 is formed so as to penetrate the inside and outside of the fixed cylinder 60, and the moving piece 100 engaged with the rectilinear groove 61 penetrates the rectilinear groove 61 from the outer peripheral side to the inner peripheral side, A cam groove 73 a formed in a cam ring 73 located on the inner peripheral side of the fixed cylinder 60 is engaged. The tip of the moving frame 100 is engaged with the lens frame 50 of the fifth lens unit L5 located further on the inner periphery of the cam ring 73, and the fifth lens unit L5 is also driven to move.
The cam groove 73a formed in the cam ring 73 is formed at a predetermined angle with respect to the optical axis X in a predetermined angle range with respect to the circumferential direction.

  In the lens barrel 1 configured as described above, when the zoom drive cylinder 71 is rotated by the rotation operation of the zoom operation ring 4, the rotary connecting member 90 is rotated. Thereby, the cam ring 73 to which the rotary connecting member 90 is attached rotates. When the cam ring 73 rotates, the cam groove 73 a moves the moving piece 100 of the zoom guide cylinder 72, and the moving piece 100 (the zoom guide cylinder 72 to which the moving piece 100 is mounted) moves in the rectilinear groove 61 of the fixed cylinder 60. Move forward and backward along. That is, the cam ring 73 moves in the front-rear direction while rotating, and the zoom guide tube 72 and the lens frame 50 move in the front-rear direction without rotating. The zoom drive cylinder 71 moves back and forth together with the zoom guide cylinder 72.

  Further, as the zoom drive cylinder 71 rotates, the first group cylinder 10 is moved in the front-rear direction via the cam pin 82, and thereby the first lens group L1 moves in the front-rear direction. Although detailed explanation is omitted, the other second lens unit L2, third lens unit L3, and fourth lens unit L4 are also in a predetermined positional relationship in conjunction with the rotation and back-and-forth movement of the cam ring 73. Driven by movement.

Thus, the lens barrel 1 continuously changes from the wide-angle state shown in FIG. 1 to the telephoto state shown in FIG. 2 and vice versa.
The focus adjustment is performed by the movement of the second lens unit L2, and the movement drive is performed by a driving means such as an ultrasonic motor or the like disposed inside the base tube portion 2 or manually, although details are not shown. It is like that.

  Next, regarding the arrangement and configuration of the rotary connecting member 90 that connects the zoom drive cylinder 71 and the cam ring 73 so as to be interlocked with each other, FIGS. 1 and 2 and FIG. 3 and FIG. A detailed description will be given with reference to FIG. 4 which is a cross-sectional view of FIG. 4A and FIG.

The rotation connecting member 90 includes a cam follower 92 that engages with the rectilinear groove 71 b of the zoom drive cylinder 71 and a bracket block 91 that is fixed to the cam ring 73 and supports the cam follower 92.
The bracket block 91 includes a mounting base portion 91 </ b> A that is fixed to the cam ring 73 and a support column portion 91 </ b> B that supports the cam follower 92.

  The mounting base 91 </ b> A has an arc shape corresponding to the outer periphery of the cam ring 73 and has a predetermined length (angle range). The cross-sectional shape along the optical axis X shown in FIG. 3 is a substantially rectangular shape having a predetermined width and a predetermined thickness. In addition, a positioning recess 91 a having a shape corresponding to a corner portion of the outer end of the cam ring 73 (a corner portion where the end surface on the front side and the outer peripheral surface intersect) is formed in the inner edge portion on the front side. Furthermore, mounting screw holes 91b are formed in the vicinity of both ends in the longitudinal direction (circumferential direction).

  The support column portion 91B has a columnar shape with a predetermined height, and is integrally provided on the outer surface in the center in the longitudinal direction (circumferential direction) of the mounting base portion 91A. The support column portion 91B is arranged eccentrically so that the peripheral surface thereof coincides with the side surface of the mounting base portion 91A. The diameter of the support column portion 91B is set to be equal to or slightly smaller than the follower body 92A of the cam follower 92 to be supported. A female screw 91c for fixing the cam follower 92 is formed inside the support column portion 91B.

The cam follower 92 is formed by integrally including a fastening screw portion 92B having a predetermined length at the tip of the follower main body 92A.
The follower body 92A has a cylindrical shape with a diameter that fits with a predetermined tolerance in the rectilinear groove 71b of the zoom drive cylinder 71, and a fastening driver groove 92a is formed on an end surface thereof.

  A cam follower 92 is attached to the tip of the support column portion 91 </ b> B of the bracket block 91 to constitute a rotary connecting member 90. As shown in FIGS. 3 to 5, the rotary connecting member 90 configured in this way is mounted by aligning the positioning recess 91 a of the mounting base 91 </ b> A of the bracket block 91 with the corner of the front outer end of the cam ring 73. It is fastened to the outer peripheral surface of the cam ring 73 by a screw 93 penetrating the base portion 91A from the outer peripheral side. In the state where the cam ring 73 is mounted, the rotary connecting member 90 is closest to the end of the fixed cylinder 60, and the cam follower 92 is located in the vicinity of the front end surface of the cam ring 73, and the first lens shown in FIG. In a state where the distance between the group L1 and the second lens group L2 is the shortest, the rotary connecting member 90 is closest to the end of the fixed barrel 60.

  On the other hand, a notch 62 for avoiding interference with the rotary connecting member 90 is formed at a portion of the fixed cylinder 60 corresponding to the rotary connecting member 90. In the wide-angle state shown in FIG. 1, the depth in the front-rear direction of the notch 62 is substantially equal to or less than the width of the mounting base 91 </ b> A of the rotary connecting member 90, and the front end surface of the cam ring 73 protrudes from the front end surface of the fixed cylinder 60. If it is, the notch 62 is not necessary.

  As described above, since the rotary connecting member 90 is arranged at the front end portion of the cam ring 73, the cutout portion 62 provided in the fixed cylinder 60 can be reduced in order to avoid interference with the rotary connecting member 90. Accordingly, the cam ring 73 can be disposed on the inner peripheral side of the fixed cylinder 60 without causing a decrease in strength of the fixed cylinder 60. As a result, it is possible to dispose constituent members such as drive means (drive motor) for focus adjustment on the inner peripheral side, and the lens barrel 1 can be configured to be small and light.

  That is, in the case of a zoom lens that includes two cam cylinders (the zoom drive cylinder 71 and the cam ring 73 in the present embodiment) that move in conjunction with each other via a rotationally moving piece and move independently back and forth, the two cam cylinders are both fixed cylinders ( It is often arranged on the outer peripheral side of the fixed cylinder 60) in the present embodiment. In this case, components such as driving means for adjusting the focus provided on the outer peripheral side of the fixed cylinder must be arranged so as not to interfere with the rotating cam cylinder, which hinders downsizing.

  On the other hand, when the cam cylinder is disposed on the inner peripheral side of the fixed cylinder and the driving means for adjusting the focus is provided on the inner peripheral side, the lens barrel can be reduced in size. However, in such a configuration, the rotationally moving piece for interlocking the two cam cylinders is provided through the fixed cylinder. The rotationally moving piece is normally arranged on the rear side of the fixed cylinder, and the rotationally moving piece moves along with the rotation and forward / backward movement of the cam cylinder, so that a large clearance (through hole) that allows movement of the connecting rotating member to the fixed cylinder Is required. As a result, it is difficult to configure the fixed cylinder to a required strength.

  On the other hand, in the present embodiment, as described above, the cam ring 73 can be disposed on the inner peripheral side without causing a decrease in the strength of the fixed cylinder 60, and components such as driving means are disposed on the inner peripheral side. Thus, the lens barrel 1 can be configured to be small and light.

(Second Embodiment)
Next, a lens barrel according to a second embodiment of the present invention will be described. The second embodiment is characterized by the shape of the moving piece 100. In addition, the same code | symbol is attached | subjected about the part similar to 1st Embodiment, and the description is abbreviate | omitted.

  As described in the first embodiment, the moving piece 100 is provided in the zoom guide cylinder 72 and engages with the rectilinear groove 61 of the fixed cylinder 60 and engages with the cam groove 73 a formed in the cam ring 73. The zoom guide tube 72 is driven to move in the front-rear direction by the rotation of the cam ring 73. FIG. 6 is an enlarged view of a portion Z in FIG. 7 is a cross-sectional view taken along the line BB in FIG.

The moving piece 100 includes a rectilinear fitting portion 101 that fits in the rectilinear groove 61 of the fixed cylinder 60, and a cam follower 102 that fits in the cam groove 73 a of the cam ring 73.
The rectilinear fitting portion 101 has a width that fits in the rectilinear groove 61 of the fixed cylinder 60 so as to be slidable and has a rectangular parallelepiped shape having a predetermined length. The height (thickness) is set to a height at which the upper surface does not protrude toward the inner peripheral side of the fixed cylinder 60 in a state where the zoom guide cylinder 72 is mounted. The linearly fitting portion 101 is molded of resin, and a nut portion 103 for supporting the cam follower 102 and fastening the movable piece 100 to the zoom guide tube 72 is integrally planted by insert molding.

The nut portion 103 has a surface on the outer peripheral side that coincides with the lower surface of the rectilinear fitting portion 101, and an inner circumferential side that has a height that coincides with the upper surface of the cam follower 102 from the straight fitting portion 101.
The cam follower 102 has a columnar shape with a predetermined height, and is erected on an end portion on the rear side of the rectilinear fitting portion 101. The diameter is set so as to be slidably fitted into the cam groove 73 a of the cam ring 73. The cam follower 102 is formed by press-fitting (extrapolating) a resin-made cylindrical member into a nut portion 103 integrally formed with the rectilinear fitting portion 101.

In the moving piece 100 configured as described above, the rectilinear fitting portion 101 penetrates from the outer surface side of the zoom guide tube 72 to the mounting portion 72A formed on the inner surface of the rear end portion of the zoom guide tube 72. It is fixed by a fixing screw 104 that is screwed into the nut portion 103.
The mounting portion 72 </ b> A of the zoom guide tube 72 is formed such that the inner surface of the rear side end portion of the zoom guide tube 72 has a planar shape corresponding to the rectilinear fitting portion 101 of the moving piece 100 to a predetermined depth. ing.

  The moving piece 100 is fixed by a fixing screw 104 in a state where the linearly fitting portion 101 is fitted to the mounting portion 72A. With such a fixing structure to the mounting portion 72 </ b> A, the moving piece 100 can be positioned by fitting the rectilinear fitting portion 101 into the mounting portion 72 </ b> A, and the moving piece 100 can be positioned when the fixing screw 104 is tightened. The moving piece 100 can be easily positioned and fixed without rotating. Further, it can be fixed so as not to be moved by a single fixing screw 104.

  According to the above configuration, the moving piece 100 fixed to the zoom guide tube 72 is slid in contact with the rectilinear groove 61 of the fixed tube 60 on the surface that is substantially the thickness of the fixed tube 60 and long in the front-rear direction. Move. For this reason, it is possible to suppress the tilt of the zoom guide tube 72 with respect to the fixed tube 60. As a result, the zoom guide tube 72 moves straight while maintaining a stable posture without causing a misalignment with respect to the fixed tube 60, and high accuracy can be realized.

  That is, a configuration in which a cylindrical moving piece (pin) that does not include the rectilinear fitting portion 101 as in the prior art moves along the rectilinear groove 61 of the fixed cylinder 60 to link the cam ring 73 and the zoom guide cylinder 72 together. In this case, the peripheral surface of the moving piece (pin) is only in linear contact with the rectilinear groove 61 of the fixed cylinder 60. Even when the pins are arranged at three locations in the circumferential direction, for example, the binding force is extremely weak, and the zoom guide The cylinder 72 tilts with respect to the fixed cylinder 60, and the zoom guide cylinder 72 becomes unstable and cannot move smoothly, so that high accuracy cannot be obtained. However, according to the present embodiment, as described above, the zoom guide tube 72 can be prevented from being tilted with respect to the fixed tube 60, and as a result, the zoom guide tube 72 is misaligned with respect to the fixed tube 60. It will move straight while maintaining a stable posture without occurring, and high accuracy can be realized.

(Third embodiment)
Next, a lens barrel according to a third embodiment of the present invention will be described. The third embodiment is characterized in that a contact prevention structure for preventing contact between the lenses of the first lens unit L1 and the second lens unit L2 is provided. FIG. 9 is an enlarged cross-sectional view of the first lens unit L1 and the second lens unit L2 of the lens barrel 1 including the contact prevention structure. In addition, the same code | symbol is attached | subjected about the part similar to 1st Embodiment, and the description is abbreviate | omitted.

  The contact prevention structure includes a contact prevention protrusion 12 provided on the first lens holding frame 11 provided at the tip of the first group cylinder 10 that holds the first lens group L1, and a second lens group L2. It is comprised by the contact prevention flange part 23B provided in the 2 lens moving frame 20. As shown in FIG.

  The first lens holding frame 11 holds the first lens group by surrounding the outer periphery of the first lens group L1. The first lens holding frame 11 is provided integrally with the first lens group cylinder at the tip of the first group cylinder 10. A contact prevention protrusion 12 is formed on the outer peripheral surface on the rear side of the first lens holding frame 11.

  The contact prevention protrusions 12 are provided on the outer periphery of the first lens holding frame 11 at three or more locations (for example, four locations at 90 ° intervals) in the radial direction about the optical axis X. The rear end abutment end 12A is located further rearward than the most rearward surface of the first lens unit L1.

  A second lens holding frame 21 is attached to the tip of the second lens moving frame 20 that moves the second lens group L2. The second lens holding frame 21 includes a holding ring portion 22 that holds the second lens group L2 and a pressing ring 23 that holds the second lens group L2 from the front.

  The retainer ring 23 is a thin cylindrical shape, and a screw that is screwed into the retaining ring portion 22 is formed on the outer peripheral surface thereof, and a small-diameter retainer portion 23A is formed on the inner peripheral side of the front end portion. Then, the holding ring 23 is screwed into the holding ring portion 22, and the outer edge portion of the front side end face of the second lens unit L <b> 2 is pressed and fixed by the holding portion 23 </ b> A. Further, a contact prevention flange portion 23 </ b> B is formed on the outer peripheral side of the front end portion of the press ring 23.

  The outer diameter of the contact prevention flange portion 23 </ b> B corresponds to the formation region of the contact prevention protrusion 12 provided in the first group cylinder 10. That is, the contact prevention flange portion 23B and the contact prevention protrusion 12 are opposed to each other.

  Here, the front surface of the contact prevention flange portion 23B of the press ring 23 in a state where the holding ring portion 22 (second lens group L2) is fixed, and the contact end 12A of the contact prevention protrusion 12 of the first group cylinder 10 The distance α is the rear surface (exit surface) of the first lens unit L1 and the second lens unit L2 in the state in which the first lens unit L1 and the second lens unit l2 shown in FIGS. The distance between the front surfaces (incident surfaces) is set to a predetermined amount smaller than β (α <β).

  This prevents the first lens unit L1 and the second lens unit L2 from inadvertently coming into contact with each other due to accumulation of errors in each unit, deformation movement due to impact, or the like, and damage to the lens surface.

  That is, when the contact prevention structure as in the present embodiment is not provided, the first lens unit L1 and the second lens unit L2 come into contact with each other due to accumulation of errors in each part or deformation movement caused by an external impact. In order to prevent the lens surface from being damaged, the distance between the two must be set, and this has become a design constraint and has been a factor that hinders downsizing.

  On the other hand, in the configuration of the present embodiment, even when the first lens group L1 and the second lens group L2 are closer than a preset interval, the holding ring 23 is moved before the lens surfaces come into contact with each other. The front surface of the contact prevention flange portion 23B and the contact end 12A of the contact prevention protrusion 12 of the first group cylinder 10 abut. Therefore, contact of the lens surface can be prevented, and damage to the lens can be prevented.

(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes as shown below are possible, and these are also within the scope of the present invention.
(1) In the third embodiment, four locations are exemplified as the number of the contact prevention protrusions 12. However, if there are three locations, the function effectively works and there may be five or more locations.

(2) In the third embodiment, the contact prevention flange portion 23 </ b> B that contacts the contact prevention protrusion 12 may be provided in the second lens moving frame 20 instead of the press ring 23. However, by providing the holding ring 23 as in the present embodiment, even if the position of the second lens unit L2 with respect to the second lens moving frame 20 changes due to, for example, optical adjustment (thickness of the spacer 24), the contact prevention flange The distance between the first lens unit L1 and the second lens unit L2 with respect to the space: α between the portion 23B and the contact prevention protrusion 12: β is more preferable because the difference in β is maintained constant.

(3) In the third embodiment, the relationship between the contact prevention protrusion 12 and the contact prevention flange portion 23B may be reversed. That is, a contact prevention protrusion as a contact portion may be provided on the second lens group L2 side, and a contact prevention flange portion as a contact receiving portion may be provided on the first lens group L1 side.

(4) In the third embodiment, depending on the configuration of the optical system, the lenses of the adjacent lens groups may not be closest to each other at the center, but in such a case, the distance between the closest positions of the lenses ( This configuration can be applied by setting the distance between the contact portion and the contact receiving portion based on the shortest distance.

(5) In the first to third embodiments, the state in which the lens barrel is shortened has been described by taking the wide-angle-side shootable state as an example, but the present invention is not limited to this. The state in which the lens barrel is shortened also includes a state in which the distance between the lens groups is shortened to a state in which an image cannot be formed at a specified position.
In addition, although embodiment and a deformation | transformation form can also be used in combination as appropriate, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

It is sectional drawing along the optical axis X of a lens barrel, and shows the state by the side of the wide angle which the lens barrel is shortening. It is sectional drawing of the lens barrel in the state zoomed to the telephoto side from FIG. It is the Y section enlarged view of FIG. It is AA sectional drawing of FIG. It is a perspective view which shows a rotation connection member. It is the Z section enlarged view of FIG. It is BB sectional drawing of FIG. It is a perspective view which shows a moving top. It is an enlarged view of the front-end | tip part of a lens-barrel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1: Lens barrel, 11: 1st lens holding frame, 12A: Protrusion, 20: 2nd lens holding frame, 23B: Flange part, 60: Fixed cylinder, 61: Straight advance groove, 71: Zoom drive cylinder, 72: Movement Tube: 73: Cam ring, 90: Rotary connecting member, 100: Moving frame, 102: Cam follower, 200: Camera, L1: First lens group, L2: Second lens group, L3: Third lens group

Claims (6)

A cylindrical fixed cylinder;
A first cam cylinder rotatable with respect to the fixed cylinder;
A second cam cylinder that fits on the side opposite to the first cam cylinder with respect to the fixed cylinder and is rotatable with respect to the fixed cylinder;
An interlocking member that is disposed adjacent to an end of the fixed cylinder and interlocks the first cam cylinder and the second cam cylinder;
A movable cylinder fitted to the fixed cylinder and movable relative to the fixed cylinder;
The fixed cylinder has a straight rectilinear groove,
A moving piece having a rectangular straight fitting part that engages with the straight groove and moves along the straight groove,
The second cam cylinder has a cam groove,
The moving piece is provided on the moving cylinder and integrally includes a cam follower that engages with the cam groove,
The moving cylinder is moved by the rotation of the second cam cylinder,
The rectilinear fitting portion is arranged such that its longitudinal direction coincides with the moving direction of the rectilinear groove, and its short direction coincides with the width direction of the rectilinear groove,
The cam follower is provided at an end of the linear fitting portion on the image plane side of the lens barrel;
A lens barrel characterized by The lens barrel according to claim 1 ,
A first lens group;
A second lens group;
Said first lens group, a distance between the second lens group by the rotation of the first cam barrel is changed,
The lens barrel, wherein the interlocking member is positioned closest to an end portion of the fixed cylinder in a state where the distance between the first and second lens groups is the shortest. The lens barrel according to claim 2 ,
The distance between the first lens holding frame that holds the first lens group and the second lens holding frame that holds the second lens group is determined based on the distance between the first lens group and the second lens group. A lens barrel that is also narrowed. In the lens barrel according to claim 3 ,
The second lens holding frame has a flange portion provided over the entire circumference on the outer periphery of the second lens holding frame;
The lens barrel, wherein the first lens holding frame has a protrusion facing the flange portion from the first lens holding frame. In the lens barrel according to any one of claims 2 to 4 ,
A lens barrel characterized in that an interval between the first lens group and the second lens group can be shortened to a state where an image cannot be formed at a predetermined position. An imaging device comprising the lens barrel according to any one of claims 1 to 5 .

Images