JP2013246336A - Lens unit and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens unit in which a predetermined lens group in the lens unit using a lens barrel having a collapsible mechanism can be easily adjusted from the outside of the lens barrel, when performing assembly, with an inexpensive, simple configuration and to provide an imaging apparatus using the lens unit.SOLUTION: An arm member 202 connected to a fifth lens group L5 is extended from the inside of a fixed barrel 104 to the outside through the notch 104b of the fixed barrel 104, so that an arm holding member 201 is slid on a base plate 101 from the outside of the fixed barrel 104, to adjust the position of the fifth lens group L5 through the arm member 202. Thus, an assembly error, etc. cumulated in the lens groups L1 to L4 can be cancelled in an assembled state.

Description

  The present invention relates to a lens unit and an imaging apparatus, and more particularly to a lens unit that can be easily adjusted during assembly and an imaging apparatus using the lens unit.

  In a lens unit including a plurality of lens groups, adjustment is performed by shifting a specific lens group in an assembled state, and the image quality of the four peripheral portions of the imaging surface is equalized. However, in particular, in the case of a lens unit having a lens barrel having a retracting mechanism, a lens barrel that is formed in a cylindrical shape and moves while rotating is frequently used. There is a problem that it is covered with a cylindrical lens barrel and the like, and it is difficult to mechanically access the lens group to be adjusted, and the adjustment work after assembly cannot be easily performed.

  On the other hand, in Patent Document 1, in a lens barrel having a single lens group or a plurality of lens groups, a holding rod that holds the lens group is supported by a guide rod having an eccentric part, and the eccentric part is arranged from the optical axis direction. An adjustment mechanism that shifts and adjusts the lens group together with the holding frame by rotating is disclosed.

JP 2005-128250 A

  By the way, according to the adjustment mechanism described above, the adjustment range is limited by the rotation angle and the amount of eccentricity of the eccentric part. Therefore, when the movement amount to be adjusted exceeds a given adjustment range, the adjustment may not be performed properly. There is. On the other hand, in order to enlarge the adjustment width, it is necessary to enlarge the eccentric portion, which is not preferable because it leads to an increase in the diameter of the lens barrel. Also, since the rotation angle of the eccentric part and the amount of eccentricity are not in a linear relationship, the calculation for obtaining the rotation angle of the eccentric part to obtain the desired alignment amount is complicated, and the mechanism is used only during assembly. New parts are required and the cost is high.

  The present invention has been made to solve the above-described problems, and has a low-cost and simple configuration, and a predetermined lens group in a lens unit using a lens barrel having a retracting mechanism is assembled from the outside of the lens barrel during assembly. It is an object of the present invention to provide a lens unit that can be easily adjusted and an imaging apparatus using the lens unit.

The lens unit according to claim 1, wherein a plurality of lens groups including a lens group to be adjusted;
A movable lens barrel that can be retracted by moving in the direction of the optical axis;
A fixed cylinder disposed outside the movable barrel and having an opening formed in a part of the outer periphery;
A main plate for holding the fixed cylinder;
An arm member that holds the lens group to be adjusted, extends from the opening to the outside of the fixed cylinder, and has a long hole;
A pin that fits into the short diameter of the long hole and pivots the arm member;
Have
In a state where the arm member is not fixed to the main plate,
By moving a portion of the arm member that extends outside the fixed cylinder in a plane perpendicular to the optical axis, the lens group to be adjusted moves in the long hole direction in a plane perpendicular to the optical axis. It is possible to swing around the pin as a fulcrum.

  In recent years, lens units have been reduced in size and thickness. In particular, in the case of a lens unit having a lens barrel provided with a retracting mechanism, a cylindrical tube that moves while rotating is often used. When the lens groups are assembled, each lens group is covered with a cylindrical barrel or the like, making it difficult to mechanically access the lens group to be adjusted. On the other hand, according to the present invention, the arm member that holds the lens group to be adjusted extends from the inside of the lens barrel to the outside via the opening of the fixed tube. The lens group that is adjusted via the arm member can be adjusted from the outside. As a result, the possibility that the adjustment amount of the lens group to be adjusted is limited is reduced. Further, since the operator can directly see the arm member outside the fixed cylinder, the lens group to be adjusted can be directly adjusted by moving the arm member in accordance with the operation according to the operator's intention. it can. Further, by configuring the pin to swing around the fulcrum, the resolution of the displacement of the lens group to be adjusted can be set to a desired value if the position of the pin is set appropriately.

  In the lens unit according to claim 2, in the invention according to claim 1, a surface orthogonal to the optical axis of the plurality of lens groups is formed on at least a part of the object-side surface of the ground plane, Outside the fixed cylinder of the arm member, there is an arm holding member that holds the arm member and an outer surface on the image side is orthogonal to the optical axis, and the outer surface on the image side of the arm holding member and the By moving a surface perpendicular to the optical axis formed on the object side of the base plate in contact with and sliding, the outside of the fixed cylinder of the arm member moves in a plane perpendicular to the optical axis of the plurality of lens groups. It is characterized by making it.

  The position of the lens group to be adjusted in the optical axis direction is changed by bringing the outer surface on the image side of the arm holding member that holds the arm member into contact with the surface perpendicular to the optical axis formed on the base plate and sliding. Only shifting can be performed without any problem.

  According to a third aspect of the present invention, in the lens unit according to the second aspect, the arm member is pivotally supported by a shaft whose both ends are supported by the arm holding member, and the urging member extends in the optical axis O direction. It is biased toward the object side and is moved in the image side direction against the biasing by the biasing member when retracted.

  Thereby, the total length of the lens unit when retracted can be further shortened.

  The lens unit according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the lens frame that holds the lens group to be adjusted is attached to the arm member via a pivot point. The lens group to be adjusted is retracted in the direction orthogonal to the optical axis by pivoting the lens frame around the pivot point with respect to the arm member when retracted. And

  Thereby, the full length of the lens unit when retracted can be further shortened.

  An imaging device according to a fifth aspect includes the lens unit according to any one of the first to fourth aspects.

  According to the present invention, a lens unit capable of easily adjusting a lens group from the outside of the lens barrel when assembling a predetermined lens group in a lens unit using a lens barrel having a retractable mechanism with an inexpensive and simple configuration, and An imaging device using the same can be provided.

1 is an external view of a digital camera that is an example of an imaging apparatus including a lens unit according to the present embodiment. It is a front view of the lens unit 100 concerning this Embodiment. It is a perspective view of the lens unit 100 at the time of collapsing. It is a perspective view of the lens unit 100 at the time of imaging. FIG. 5 is a view of the configuration of FIG. 2 taken along the line VV and viewed in the direction of the arrow, and is a cross-sectional view showing a state when the lens unit 100 is retracted. 2 is a cross-sectional view illustrating a state of the lens unit 100 at a wide angle. FIG. FIG. 3 is a cross-sectional view showing a state of the lens unit 100 at a telephoto position. 2 is an enlarged cross-sectional view showing a part of a lens unit 100. FIG. It is the figure which looked at the holding mechanism of the 5th lens group L5 in the optical axis direction. It is a perspective view of the holding mechanism of the 5th lens group L5. It is a figure which shows the holding frame periphery of a 5th lens. It is the figure which looked at the holding mechanism of the 5th lens group L5 at the time of collapsing in the optical axis direction. It is a perspective view of the holding mechanism of the 5th lens group L5 at the time of retraction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a digital camera that is an example of an imaging apparatus including a lens unit according to the present embodiment. FIG. 1A is a front view of the digital camera 1, and FIG. 1B is a rear view.

  As shown in FIG. 1, the digital camera 1 includes an imaging unit 2 having a lens unit and an imaging device, and a camera body unit 3.

  The imaging unit 2 includes a zoomable lens unit and a solid-state imaging device such as a CCD, and can convert a subject image formed via the lens unit into an image signal by the solid-state imaging device.

  The camera body unit 3 includes an LCD display unit 6 including an LCD (Liquid Crystal Display), an EVF (Electronic View Finder) 7, and external connection terminals for connecting the digital camera 1 to a personal computer (not shown). The image signal captured by the imaging unit 2 is subjected to predetermined signal processing, image display on the LCD display unit 6 and EVF 7, image recording on a recording medium such as a memory card (not shown), or a personal computer Processing such as transferring an image to.

  On the front surface of the camera body 3, a flash light emitting unit 4 is provided at an appropriate upper position. Further, an LCD display unit 6 and an EVF 7 are provided on the back side of the camera body unit 3 for displaying captured images and reproducing and displaying recorded images.

  On the upper surface of the camera body 3, there are provided a shutter button 5 and a shooting mode changeover switch (not shown) that switches between “recording mode” and “reproduction mode” near the shutter button 5. The recording mode is a mode for taking a picture from the shooting standby state through the exposure control process, and the playback mode is a mode for reproducing and displaying the shot image recorded on the memory card on the LCD display unit 6 and the EVF 7. is there.

  On the back surface of the camera body 3, a playback frame advance switch / zoom switch 9 is provided for frame playback of playback images and zoom operations during shooting. The frame advance of the playback image by the playback frame advance switch / zoom switch 9 is a mode in which the camera is set to the playback mode and the images recorded on the memory card 13 are sequentially displayed on the LCD display unit 6 together with the frame number. . Note that it is possible to instruct to change the image display on the LCD display unit 6 in the ascending order direction (direction of photographing order) or the descending order direction (direction opposite to the photographing order). Further, the zoom operation at the time of shooting is performed by operating the playback frame advance switch / zoom switch 9 to change the magnification of the imaging optical system, which is a zoom lens, in the tele direction or the wide direction.

  Further, an EVF changeover switch 8 for selecting an LCD display unit 6 and an EVF 7 for displaying an image is provided on the back surface of the camera body unit 3.

  In addition, a battery (not shown) as a power source for operating the digital camera 1 is provided inside the bottom surface of the camera body 3.

  2 is a front view of the lens unit 100 according to the present embodiment, FIG. 3 is a perspective view of the lens unit 100 when retracted, and FIG. 4 is a perspective view of the lens unit 100 during imaging. . FIG. 5 is a view of the configuration of FIG. 2 cut along the VV line and viewed in the direction of the arrow, showing a state when retracted, FIG. 6 showing a state at wide angle, and FIG. 7 showing a state at telephoto. . FIG. 8 is an enlarged cross-sectional view showing a part of the lens unit 100.

  The lens unit 100 according to the present embodiment will be described using a zoom lens having a five-group configuration as an example. The lens unit 100 includes a first lens group L1, a second lens group L2, a third lens group L3, a fourth lens group L4, and a fifth lens group L5 in order from the object side. The first lens group L1, the second lens group L2, the third lens group L3, and the fourth lens group L4 move in the direction of the optical axis O while changing the distance between the groups, and perform zooming. The fourth lens unit L4 also moves in the direction of the optical axis O to perform focusing. The fifth lens group L5 is a lens group that does not move in the optical axis direction during imaging, and is a lens group that is adjusted during assembly.

  A schematic configuration of the lens unit 100 will be described with reference to FIG. The ground plane 101 holds the image sensor 103 via the substrate 102. A fixed cylinder 104 is attached to the base plate 101. On the inner peripheral surface of the fixed cylinder 104, a cam groove (not shown) and a straight guide groove 104a are provided.

  The rotary cylinder (movable lens barrel) 105 is a cylinder housed on the inner diameter side of the fixed cylinder 104, and rotates with respect to the fixed cylinder 104 by obtaining a rotational force via an outer gear portion 105a by an actuator (not shown). And it moves to an optical axis direction by engagement with the cam pin not shown provided in the outer surface, and the above-mentioned cam groove.

  A first straight guide 106 is provided inside the rotary cylinder 105. The first rectilinear guide 106 is engaged with the rectilinear guide groove 104 a of the fixed cylinder 104, a protrusion 106 a that restricts rotation, and an annular part 106 b that engages with a circumferential groove 105 b formed on the inner periphery of the rotary cylinder 105. Have Therefore, the first rectilinear guide 106 moves in the optical axis direction together with the rotating cylinder 105 without rotating by the rectilinear guiding groove 104 a of the fixed cylinder 104. A rectilinear guide groove 106 c is provided on the inner periphery of the first rectilinear guide 106.

  A second rectilinear guide 107 is provided on the inner side of the first rectilinear guide 106, and a protrusion 107 a provided at the end is engaged with the rectilinear guide groove 106 c of the first rectilinear guide 106. A first holding frame 108 that holds the first lens unit L1 is provided inside the second rectilinear guide 107, and the first holding frame is inserted into the rectilinear guide groove 107b formed on the inner periphery of the second rectilinear guide 107. A protrusion 108 a formed on the outer periphery of 108 is engaged. A follower pin portion 108 b is provided on the inner periphery of the first holding frame 108.

  An inner cam cylinder 109 is provided inside the first holding frame 108. The inner cam cylinder 109 is engaged with a groove (not shown) formed on the inner periphery of the rotating cylinder 105 with a follower pin portion 109 a protruding from the outer periphery of the end portion, and rotates together with the rotating cylinder 105. In addition, a cam groove is formed in the first rectilinear guide 106, and the follower pin portion 109a that is penetrated and engaged moves in the optical axis direction along the cam groove.

  A follower pin portion 108 b formed on the first holding frame 108 is engaged with an outer peripheral cam groove 109 b formed on the outer periphery of the inner cam cylinder 109. A third rectilinear guide 110 is provided inside the inner cam cylinder 109, and a protrusion 110 a provided at the end is engaged with the rectilinear guide groove 106 c of the first rectilinear guide 106. A rectilinear guide groove 110 b is provided on the inner periphery of the third rectilinear guide 110. The second rectilinear guide 107, the third rectilinear guide 110, and the inner cam cylinder 109 move in the optical axis direction while maintaining the positional relationship in the optical axis direction.

  Inside the third rectilinear guide 110, a second holding frame 111 for holding the second lens group L2 and a third lens holding frame 112 for holding the third lens group L3 are provided. The second holding frame 111 includes a rectilinear key portion 111 a that engages with the rectilinear guide groove 110 b of the third rectilinear guide 110 and a follower pin portion 111 b that engages with an inner peripheral cam groove 109 c formed on the inner periphery of the inner cam cylinder 109. And have. Similarly, the third holding frame 112 is engaged with a rectilinear key portion 112 a that engages with the rectilinear guide groove 110 b of the third rectilinear guide 110 and an inner peripheral cam groove 109 d formed on the inner periphery of the inner cam cylinder 109. And a follower pin portion 112b.

  The fourth lens unit L4 is held by a fourth holding frame 113 that is driven in the optical axis direction by an actuator (not shown). As shown in FIGS. 6 and 7, the fifth lens unit L5 is supported by the arm member 202, and the arm member 202 passes through the notch (opening) 104b formed in the fixed cylinder 104. The sleeve portion 202a is pivotally supported on a shaft 201c that is supported at both ends by the arm holding member 201 outside the fixed cylinder 104, and is urged toward the object side in the optical axis O direction by a spring 203. . Further, a lens barrier that closes when retracted and protects the first lens unit L1 may be provided on the object side of the first holding frame 108.

  With the above-described configuration, the first lens unit L1 held by the first holding frame 108 is engaged with the outer peripheral cam groove 109b of the rotating inner cam cylinder 109 and the follower pin portion 108b formed on the first holding frame 108. Due to the engagement between the rectilinear guide groove 107b and the protrusion 108a, it moves toward the object side by zooming from the wide-angle end to the telephoto end.

  The second lens unit L2 held by the second holding frame 111 includes an engagement between the inner peripheral cam groove 109c of the rotating inner cam cylinder 109 and the follower pin portion 111b formed on the second holding frame 111, and a straight guide groove. Due to the engagement between 110b and the straight key portion 111a, the zoom lens moves toward the image side by zooming from the wide-angle end to the telephoto end.

  The third lens unit L3 held by the third holding frame 112 includes an engagement between the inner peripheral cam groove 109d of the rotating inner cam cylinder 109 and the follower pin portion 112b formed on the third holding frame 112, and a straight guide groove. Due to the engagement between 110b and the straight key portion 112a, the zoom lens moves toward the object side by zooming from the wide-angle end to the telephoto end.

  The fourth lens group L4 held by the fourth holding frame 113 is independent of the fourth holding frame 113 by an actuator (not shown) in accordance with the movement of the first to third lens groups L1 to L3 in the optical axis direction. Driven to move to the object side by zooming from the wide-angle end to the telephoto end. Further, focusing is performed by the fourth lens unit L4.

In the fifth lens unit L5 held by the arm member 202, the tip of the sleeve portion 202a is brought into contact with the object-side inner wall of the arm holding member 201 by the spring 203 and becomes a position at the time of imaging.
As described above, during imaging, the first to fourth lens units L1 to L4 are displaced between the wide angle and the telephoto range shown in FIGS. 6 and 7, and the fifth lens unit L5 is stopped at a predetermined position. Withdrawing from the axis, the state shown in FIG. 5 is obtained. In the fifth lens unit L5, the fourth holding frame 113 moves to the image side during the retracting operation, presses the arm member 202, and moves to the base plate 101 side against the urging force of the spring 203. Yes.

  Next, the holding mechanism and adjustment of the fifth lens unit L5 will be described. 9 is a view of the holding mechanism of the fifth lens unit L5 and the base plate 101 as viewed from the optical axis direction, and FIG. 10 is a perspective view of the holding mechanism of the fifth lens unit L5 and the base plate 101. Note that the fixed cylinder is omitted. FIG. 11 is a diagram illustrating a holding mechanism for the fifth lens. 12 to 13 are similar views when retracted.

  9 and 10, the ground plane 101 has a flat region 101a formed on the object side surface. The flat region 101a is formed on a surface orthogonal to the optical axis O. A short wall 101b that restricts the adjustment range is provided on the outer edge of the region 101a. A triangular prism block-shaped arm holding member 201 is disposed in contact with the region 101a.

  The arm holding member 201 has a side surface 201 a facing the fixed cylinder 104 formed in an arc shape having substantially the same radius of curvature as the outer peripheral surface of the fixed cylinder 104 (partially indicated by a broken line in FIG. 9). It is arranged with a gap. The arm holding member 201 has a slit-like notch 201b extending in the optical axis direction, and accommodates the sleeve portion 202a of the arm member 202 therein. The arm holding member 201 may be provided with a small hole 201e or the like for engaging a sharp jig or the like so as to facilitate work during adjustment.

  With reference to FIGS. 6 and 11, a shaft 201 c having both ends supported by the arm holding member 201 is provided in the arm holding member 201 and penetrates the sleeve portion 202 a of the arm member 202. Accordingly, the sleeve portion 202a of the arm member 202 is guided by the shaft 201c and is movable in the optical axis direction, and is urged toward the object side by the spring 203 provided around the shaft 201c.

  The image-side surface of the arm holding member 201 (the contact surface with the base plate 101) is formed to be orthogonal to the optical axis O. The shaft 201c is supported perpendicular to the contact surface. The arm member 202 extends over the inside and outside of the fixed cylinder 104 through a notch (opening) 104b (see FIG. 6) extending in the optical axis direction of the fixed cylinder 104.

  The arm member 202 has a rectangular opening 202b (FIG. 12) corresponding to the imaging element 103 inside the fixed cylinder 104, and a shaft 202d is implanted in a frame 202c provided at the other end. Has been established. In FIG. 11, a shaft 202d as a pivot point is inserted through the short arm 204a of the fifth holding frame 204 that holds the fifth lens unit L5, and the short arm 204a is counterclockwise in FIG. It is energized around. The fifth holding frame 204 is in the state shown in FIGS. 9 and 10 at the time of imaging when the locking bar 204b formed on the opposite side of the short arm 204a is in contact with the locking pin portion 202f by the biasing force of the torsion spring 205. It becomes.

  Further, the arm member 202 has a long hole 202e at the center, and a pin 206 with a head passing through the long hole 202e is implanted in the main plate 101 as shown in FIG. The width of the long hole 202e is precisely fitted to the shaft diameter of the engaged pin 206 with the head, and there is no play in the width direction between the two. In addition, although it is preferable that the pin 206 is with a head, an axis | shaft without a head may be sufficient.

  The manner of assembling and adjusting the fifth lens unit L5 will be described. 9 and 10, the lens unit 100 including the fixed cylinder 104 is temporarily assembled with the arm holding member 201 placed on the base plate 101. In this state, the fifth holding frame 204 urged counterclockwise by the torsion spring 205 is fixed to the arm member 202 with the locking bar 204b coming into contact with the locking pin portion 202f. The member 202 is swingable in a plane perpendicular to the optical axis with the head-mounted pin 206 as a fulcrum.

  In a state where the lens groups L1 to L5 are set to the positions at the time of imaging, a chart (not shown) is imaged, the image signal output from the image sensor 103 is analyzed, and if one blur occurs, one blur is eliminated (peripheral In order for the performance to be equalized), the surface of the base plate 101 is slid with the image-side surface of the arm holding member 201 in contact with the flat region 101a.

  Specifically, when the arm holding member 201 is moved while sliding in the direction A, the arm member 202 moves in the longitudinal direction of the long hole 202e, so that the fifth lens group L5 is orthogonal to the optical axis. Can be moved in the direction. Further, when the arm holding member 201 is swung while sliding in the B direction (concentric direction with the optical axis as the center) in the drawing, the arm member 202 is swung with the pin 206 with the head as a fulcrum, so that the fifth lens The group L5 can be swung in the direction b shown in the figure orthogonal to the optical axis. That is, the fifth lens unit L5 is displaced (shifted) in an arbitrary direction in a plane orthogonal to the optical axis with respect to the other lens units L1 to L4 by sliding in the A direction and the B direction in the drawing. And can be adjusted for the other lens groups L1 to L4. When the arm holding member 201 is slid on the base plate 101 and there is no blur, the arm holding member 201 is moved to the base plate 101 (for example, between the wall 101b and the arm holding member 201 or between the base plate 101 and the arm). The adjustment process is completed by adhering to the end of the contact surface of the member 201 using a UV adhesive or the like.

  According to the present embodiment, the arm member 202 connected to the fifth lens unit L5 extends from the inside to the outside of the fixed cylinder 104 via the notch 104b of the fixed cylinder 104, so that the fixed By sliding the arm holding member 201 on the base plate 101 from the outside of the cylinder 104, the position adjustment (shift adjustment) of the fifth lens unit L5 can be performed via the arm member 202, thereby the lens unit L1. The assembly error accumulated at ~ L4 can be canceled in the assembled state. Since the operator can directly see the arm holding member 201, the fifth lens unit L5 can be directly adjusted by sliding the arm holding member 201 on the base plate 101 in accordance with the operation according to the operator's intention. Can be done.

  In particular, since the head-attached pin 206 is provided as an adjustment fulcrum between the arm holding member 201 and the fifth lens unit L5, the adjustment resolution can be increased. That is, the ratio of the amount by which the arm holding member 201 is swung to the amount by which the fifth lens unit L5 is swung can be set by setting the position of the head-attached pin 206 between the optical axis O and the shaft 201c. Thereby, a desired resolution can be set easily. It should be noted that a long hole 202e may be provided on the frame part 202c side to allow the head-attached pin 206 to pass therethrough.

  Further, the image-side surface of the arm holding member 201 and the flat region 101a of the ground plate 101 on which the image-side surface of the arm holding member 201 slides are formed on a surface orthogonal to the optical axis O. Even if the arm holding member 201 is slid, the fifth lens unit L5 does not move or tilt in the optical axis direction.

  In the lens unit 100 according to the present embodiment, as shown in FIGS. 6 and 7, the sleeve 202 a of the arm member 202 is biased toward the object side by the spring 203 with respect to the arm holding member 201 during imaging. . When the collapsing operation is performed from this state, the fourth holding frame 113 that holds the fourth lens unit L4 moves to the image side, and a part (slope) of the fourth holding frame 113 is shorter than the fifth holding frame 204. The fifth holding frame 204 is rotated against the urging force of the torsion spring 205 (in the clockwise direction in the figure) by coming into contact with the protrusion 204c of the arm 204a. As a result, the fifth lens unit L5 retreats together with the fifth holding frame 204 from the rectangular opening 202b in the direction perpendicular to the optical axis. Further, the fourth holding frame 113 moves to the image side, presses the arm member 202, moves the arm member 202 to the image side against the urging force of the spring 203, and the state shown in FIGS. . By retracting the fifth lens unit L5 together with the fifth holding frame 204 from the rectangular opening 202b in the direction perpendicular to the optical axis, the first to fourth lens units can be brought closer to the base plate 101, and the total length when retracted Can be made shorter. When shifting from the retracted state to the photographing state, the operation is the reverse of the above. Note that the movement of the arm member 202 toward the base plate is performed by pressing with any one of the first rectilinear guide 106, the third rectilinear guide 110, and the third holding frame 112, and a fifth portion of the fourth holding frame 113 is used. You may comprise so that the holding frame 204 may be rotated.

  The present invention is not limited to the embodiments described in the specification, and other embodiments and modifications are apparent to those skilled in the art from the embodiments and ideas described in the present specification. It is. The description and examples are for illustrative purposes only, and the scope of the invention is indicated by the following claims. In the above-described embodiment, the lens group that does not move at the time of zooming and focusing is used as the adjusted lens group. However, the lens group that moves during focusing may be used as the adjusted lens group. In this case, the actuator may be adjusted by moving it together. In the above-described embodiment, the zoom lens having the five-group configuration has been described. However, the present invention is not limited to the five-group configuration. In addition, the lens group to be adjusted is moved in the direction of the image sensor and retracted from the optical axis when retracted, but either or both of the movement in the direction of the image sensor and the retract from the optical axis are not performed. It may be a configuration. In the case of a configuration that does not retract from the optical axis, a holding frame that holds the lens group that is adjusted to the arm member is formed. When the lens group to be adjusted does not move in the direction of the image sensor, the arm member and the arm holding member may be integrally formed.

DESCRIPTION OF SYMBOLS 1 Digital camera 2 Image pick-up part 3 Camera main-body part 4 Flash light emission part 5 Shutter button 6 Display part 8 Changeover switch 9 Zoom switch 13 Memory card 100 Lens unit 101 Base plate 101a Area 101b Wall 102 Substrate 103 Imaging element 104 Fixed cylinder 104a Straight guide groove 104b Notch 105 Rotating tube (moving lens barrel)
105a Gear portion 105b Circumferential groove 106 First straight guide 106a Projection portion 106b Annular portion 106c Straight travel guide groove 107 Second straight travel guide 107a Projection portion 107b Straight travel guide groove 108 First holding frame 108a Projection portion 108b Follower pin portion 109 Inner cam cylinder 109a Follower pin Portion 109b outer circumferential cam groove 109c inner circumferential cam groove 109d inner circumferential cam groove 110 third rectilinear guide 110a projection 110b rectilinear guide groove 111 second holding frame 111a rectilinear key portion 111b follower pin portion 112 third retaining frame 112a rectilinear key portion 112b follower pin Portion 113 fourth holding frame 201 arm holding member 201a side surface 201b notch 201c shaft 201e small hole 202 arm member 202a sleeve portion 202b rectangular opening 202c frame portion 202d shaft 202e long hole 202f Pin 203 spring 204 fifth holding frame 204a short arm 204b engaging bar 204c protruding portion 205 torsion spring 206 headed pin L1~L4 lens group L5 fifth lens group (lens to be adjusted)
O Optical axis

Claims (5)

A plurality of lens groups including a lens group to be adjusted;
A movable lens barrel that can be retracted by moving in the direction of the optical axis;
A fixed cylinder disposed outside the movable barrel and having an opening formed in a part of the outer periphery;
A main plate for holding the fixed cylinder;
An arm member that holds the lens group to be adjusted, extends from the opening to the outside of the fixed cylinder, and has a long hole;
A pin that fits into the short diameter of the long hole and pivots the arm member;
Have
In a state where the arm member is not fixed to the main plate,
By moving a portion of the arm member that extends outside the fixed cylinder in a plane perpendicular to the optical axis, the lens group to be adjusted moves in the long hole direction in a plane perpendicular to the optical axis. A lens unit characterized in that it can be swung with the pin as a fulcrum. A surface orthogonal to the optical axes of the plurality of lens groups is formed on at least a part of the object-side surface of the ground plane,
On the outside of the fixed cylinder of the arm member, there is an arm holding member that holds the arm member and is formed so that the outer surface on the image side is orthogonal to the optical axis,
The outer surface of the arm member on the image side of the arm holding member and a surface perpendicular to the optical axis formed on the object side of the base plate are brought into contact with each other to slide outside the fixed tube of the arm member. The lens unit according to claim 1, wherein the lens unit is moved in a plane orthogonal to the optical axis of the group.   The arm member is pivotally supported by a shaft whose both ends are supported by the arm holding member, and is urged toward the object side in the optical axis O direction by the urging member, and is urged by the urging member when retracted. The lens unit according to claim 2, wherein the lens unit is moved in a direction against the image side.   The lens frame that holds the lens group to be adjusted is attached to the arm member via a pivot point, and the lens frame is pivoted around the pivot point with respect to the arm member when retracted. The lens unit according to claim 1, wherein the lens group to be adjusted is retracted in a direction orthogonal to the optical axis.   An imaging apparatus comprising the lens unit according to claim 1.