JP6136089B2 - Lens barrel and imaging device - Google Patents

Description

  The present invention relates to a lens barrel and an imaging apparatus.

  Conventionally, there is a lens barrel including a lens group suspended by a guide bar (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2001-066487

  However, in such a lens barrel, mutual decentration occurs between the fixed lens group fixed to the frame holding the guide bar and the movable lens group suspended on the guide bar, resulting in a decrease in optical performance. May be invited.

  An object of the present invention is to provide a lens barrel and an imaging apparatus that can easily perform optical alignment.

The lens barrel of the present invention is engaged with a first holding frame that holds the first optical member, guides the first holding frame in the optical axis direction of the first optical member, and the optical axis direction. A base extending to the base, a first support projecting from the base in an orthogonal direction substantially orthogonal to the optical axis, and supporting one end of the guide bar, and an other end of the guide bar projecting from the base in the orthogonal direction A guide bar holding member having a second support portion supported via a cylindrical eccentric member that is eccentric with respect to the central axis of the guide bar, holding the second optical member, and the guide bar is inserted, At least a portion of the first support portion is in surface contact with the second support frame, the relative position of the first support portion being fixed relative to the guide bar holding member, and the third optical member, and the eccentricity of the second support portion. Inner circumference than the part where the member is provided In, e Bei third holding frame is fixed at least partially in contact, and the direction of the optical axis, the third holding frame and the second support portion is detachably and camera mount of the camera body It was set as the structure provided between the lens mount to engage and the said 1st holding frame .

In addition, the said structure may be improved suitably, and at least one part may substitute for another structure.

  According to the present invention, it is possible to provide a lens barrel and an imaging apparatus that can easily perform optical alignment.

It is a figure which shows notionally the camera which is one Embodiment which concerns on this invention. It is a partial expanded sectional view of the lens barrel in FIG. FIG. 3 is a partially enlarged cross-sectional view of a lens barrel at a cross-sectional position different from that of FIG. It is an external appearance perspective view of the 3rd lens frame holding a 3rd lens group. It is a conceptual diagram explaining the alignment mechanism of the 4th lens group by an eccentric color.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram conceptually showing a camera 1 according to an embodiment of the present invention.
In the following drawings, an XYZ orthogonal coordinate system is provided for ease of explanation and understanding. In this coordinate system, when the photographer shoots a horizontally long image with the optical axis OA being horizontal, the direction toward the left side when viewed from the photographer at the position of the camera (hereinafter referred to as a positive position) is the X plus direction. A direction toward the upper side in FIG. Also, the direction toward the subject at the normal position is the Z plus direction. The Z plus direction is also referred to as the front side, and the Z minus direction is also referred to as the back side. Furthermore, movement in a direction parallel to the optical axis OA (that is, the Z axis) is referred to as “straight forward”, and rotation about the optical axis OA is referred to as “rotation”.

The camera 1 includes a camera body 10 and a lens barrel 100.
The lens barrel 100 is a so-called zoom lens capable of variably adjusting the focal length. The lens barrel 100 includes a plurality of lens groups (L1 to L5) that constitute a photographing optical system.
The lens barrel 100 includes a lens mount LM that is detachably engaged with the camera mount CM, and is detachably attached to the camera body 10 by the lens mount LM.
As a result, the camera 1 can shoot by exchanging different lens barrels 100 according to applications. The lens barrel 100 will be described in detail later.

The camera body 10 includes a quick return mirror 11, a finder screen 12, a pentaprism 13, an eyepiece optical system 14, a shutter 15, an image sensor 16, a display device 17, a control device 18, and the like.
The quick return mirror 11 is a mirror that is swingably provided in the camera body 10 in order to bend the optical path of the subject image collected by the lens barrel 100 toward the viewfinder screen 12. In response to the release operation, the quick return mirror 11 moves to a retracted position (indicated by a two-dot chain line in FIG. 1) that does not prevent the subject light from entering the image sensor 16.

The finder screen 12 is a screen for forming a subject image reflected by the quick return mirror 11, and is disposed between the quick return mirror 11 and the pentaprism 13.
The pentaprism 13 is a prism having a pentagonal cross-sectional shape, and is disposed on the upper part of the camera body 10 in a horizontal position. The pentaprism 13 guides the image formed on the finder screen 12 to the eyepiece optical system 14 as an erect image.

The eyepiece optical system 14 is an optical system for magnifying and observing a subject image that has become an erect image by the pentaprism 13, and is arranged on the back side (photographer side) of the pentaprism 13.
The shutter 15 opens and closes in response to a release operation, and controls the exposure time of subject image light that forms an image on the image sensor 16.

The imaging element 16 is a photoelectric conversion element such as a CCD that converts an object image formed by the lens barrel 100 into an electric signal. The imaging element 16 is provided on the back side (the right side shown in FIG. 1) inside the camera body 10 in a state where the light receiving surface is orthogonal to the optical axis OA.
The display device 17 includes a display panel such as a liquid crystal provided on the back side (photographer side) outside the camera body 10. The display device 17 displays a photographed image, information relating to photographing such as an exposure time, and the like on the display panel.
The control device 18 includes a CPU and the like, and comprehensively controls each component of the camera body 10 and the lens barrel 100 described above.

  As described above, the camera body 10 is configured by integrally connecting the lens barrel 100 to the camera 1. In the coupled state, the control device 18 of the camera body 10 and a power source (not shown) are connected to the lens barrel 100 via a connection terminal (not shown), and a focusing motor, an aperture unit, etc. (not shown) in the lens barrel 100 are connected by the control device 18. Control driven.

And the camera 1 acts as follows at the time of imaging | photography.
When a shutter button (not shown) provided in the camera body 10 is pressed (release operation), the quick return mirror 11 moves to the retracted position. The shutter 15 opens and closes in response to a release operation, and causes the image sensor 16 to expose subject image light for a predetermined time. The imaging element 16 converts subject image light into an electrical signal and images it. The imaging data imaged by the imaging element 16 is recorded in a recording unit (not shown), and thereby imaging is performed.

Next, the lens barrel 100 will be described in detail with reference to FIGS. 2 to 5 in addition to FIG. 1 described above.
FIG. 2 is a partially enlarged sectional view of the lens barrel 100 in FIG. FIG. 3 is a partially enlarged cross-sectional view of the lens barrel 100 at a cross-sectional position different from that of FIG. FIG. 4 is an external perspective view of the third lens frame F3 that holds the third lens unit L3. 5A and 5B are conceptual diagrams for explaining the alignment mechanism of the fourth lens unit L4 by the eccentric collar 150. FIG. 5A is an enlarged cross-sectional view of the guide bar holding cylinder 130, and FIG. It is the figure seen from the back side.

  The lens barrel 100 is a zoom lens that can variably adjust the focal length as described above. The fixed barrel 110 includes a cam barrel 120, a guide bar holding barrel 130, and five lens groups (L1 to L5). The lens barrel 100 is attached to the camera body 10 via a lens mount LM provided at an end on the back side.

  The change (zooming) of the focal length in the lens barrel 100 is performed by the movement of the lens groups (L1 to L5) in the optical axis OA direction. 1 to 3 show the wide-angle end, and on the telephoto side, the lens groups (L1 to L5) respectively move from the illustrated state to the front side by a predetermined amount. Further, the movement of the imaging position (focus adjustment) in the lens barrel 100 is performed by the movement of the second lens unit L2 in the optical axis OA direction. Furthermore, the lens barrel 100 includes a shake correction unit 200 that corrects image movement on the imaging plane caused by camera shake or the like. The fourth lens unit L4 is a blur correction optical system constituting the blur correction unit 200.

In the fixed barrel 110, an outer cylinder portion 111 that forms the outer surface of the lens barrel 100 and a fixed inner cylinder 112 that is positioned concentrically on the inner peripheral side thereof are integrated at a base end portion (end on the back side). It is configured. A lens mount LM is fixed to an end of the fixed barrel 110 on the back side.
A focus operation ring 101 and a zoom operation ring 102 are rotatably mounted on the outer periphery of the outer cylinder portion 111.

Between the outer cylinder part 111 and the fixed inner cylinder 112, a space for accommodating a focusing motor (not shown) and a control board constituting a lens control part for controlling the lens barrel 100 is formed.
As shown in FIG. 3, the fixed inner cylinder 112 includes a movable inner cylinder rectilinear groove 113 that guides the movement of the guide bar holding cylinder 130 and a cam groove 114 that drives and moves the cam cylinder 120.

The cam cylinder 120 is disposed inside the fixed inner cylinder 112 so as to be rotatable and rectilinearly movable. As shown in FIG. 3, the cam cylinder 120 includes a follower pin 121 projecting from the outer peripheral surface, a straight operation groove 122 formed in parallel with the optical axis OA, and an inner cylinder cam that moves the guide bar holding cylinder 130. A groove 123 and a fourth group cam groove 124 for moving and operating the blur correction unit 200 (fourth lens group L4) are provided.
The follower pin 121 is slidably fitted in a cam groove 114 formed in the fixed inner cylinder 112. An operation key 104 fixed to the zoom operation ring 102 is fitted into the straight operation groove 122 through the fixed inner cylinder 112.
As a result, the cam cylinder 120 is rotated via the operation key 104 by the rotation of the focus operation ring 101, and moves straight in accordance with the displacement in the optical axis OA direction of the cam groove 114 of the fixed inner cylinder 112 into which the follower pin 121 is fitted. .

  The first lens group L1 and the second lens group L2 are respectively held by the first lens frame F1 and the second lens frame F2, and are provided in the fixed barrel 110 so as to be able to move straight. The first lens frame F1 and the second lens frame F2 are linked to the cam cylinder 120 via a linkage mechanism (not shown), and the first lens group L1 and the second lens group L2 are interlocked with the rotation and straight movement of the cam cylinder 120. Then go straight ahead.

The guide bar holding cylinder 130 is a substantially cylindrical member, and is disposed inside the cam cylinder 120 so as to be rotatable and rectilinearly movable.
The third lens group L3 is fixed to the guide bar holding cylinder 130 in the vicinity of the front end portion thereof via the third lens frame F3, and the fifth lens group L5 is attached to the rear end portion of the fifth lens frame F5. Is fixed through.

In addition, a pair of guide bars (a main guide bar 141 and a sub guide bar 142) are disposed in the guide bar holding cylinder 130 in parallel with the optical axis OA. These guide bars 141 and 142 support the shake correction unit 200 (fourth lens unit L4) so as to be able to move linearly.
That is, the guide bar holding cylinder 130 holds the third lens group L3 and the fifth lens group L5 in a fixed manner, and holds the fourth lens group L4 (blur correction unit 200) with the guide bars 141 and 142 so that the fourth lens group L4 can move straight. ing.

A follower pin 133 protrudes from the outer peripheral surface of the guide bar holding cylinder 130. The follower pin 133 is slidably fitted into an inner cylinder cam groove 123 formed in the cam cylinder 120, penetrates through the inner cylinder cam groove 123, and a movable inner cylinder rectilinear groove formed on the inner periphery of the fixed inner cylinder 112. 113 is slidably fitted.
Accordingly, the guide bar holding cylinder 130 is driven to move by the inner cylinder cam groove 123 while being regulated by the movable inner cylinder linear groove 113 as the cam cylinder 120 rotates and goes straight, and moves straight.

  The shake correction unit 200 includes a base frame 210, a vibration-proof lens holding frame 220 that holds the fourth lens unit L4 that is a shake correction optical system and is movable with respect to the base frame 210 in a direction perpendicular to the optical axis OA, The overall schematic shape is configured as a disk having a predetermined thickness. Further, the shake correction unit 200 includes a guide bearing portion 230, a detent engagement portion 240, and a follower pin 201 on the outer periphery thereof.

The base frame 210 has a disk shape with a predetermined thickness, and the guide bearing portion 230, the anti-rotation engagement portion 240 and the follower pin 201 are provided on the outer peripheral surface of the base frame 210.
The anti-vibration lens holding frame 220 has a disc shape with a predetermined thickness, and holds the fourth lens unit L4 in the center.
A pair of voice coil motors (not shown) (X-axis direction and Y-axis direction) are interposed between the base frame 210 and the anti-vibration lens holding frame 220, and the anti-vibration lens holding frame 220 is provided by the voice coil motor. The base frame 210 is driven to move in a direction orthogonal to the optical axis OA.

A sleeve 231 that is slidably fitted to the main guide bar 141 in the guide bar holding cylinder 130 so as to be slidably movable with a predetermined fitting tolerance is press-fitted and fixed in parallel to the optical axis OA.
The detent engagement portion 240 includes a U-shaped engagement groove 241 that opens outward. The width of the engaging groove 241 (the interval between the opposing surfaces) is set so that the sub guide bar 142 is slidably fitted.
The follower pin 201 protrudes at a predetermined position on the outer periphery of the shake correction unit 200, and as shown in FIG. 3, the guide bar holding tube 130 penetrates (freely fits), and 4 of the cam tube 120 located on the outer periphery side thereof. The group cam groove 124 is slidably fitted.

In the shake correction unit 200, the sleeve 231 of the guide bearing portion 230 is fitted to the main guide bar 141, and the engagement groove 241 of the anti-rotation engagement portion 240 is fitted to the sub guide bar 142. While being guided by the main guide bar 141 and controlled by the sub guide bar 142, the guide bar holding cylinder 130 is provided so that it can move straight without rotating.
When the cam cylinder 120 rotates and goes straight, the blur correction unit 200 is operated by the follower pin 201 by the fourth group cam groove 124 and moves straight along the main guide bar 141.
That is, the shake correction unit 20 rotates the inside of the guide bar holding cylinder 130 that moves straight by the rotation of the cam cylinder 120 by the rotation of the zoom operation ring 102 and the straight movement in a different relationship independent of the guide bar holding cylinder 130. Move straight ahead.

The lens barrel 100 configured as described above is rotationally operated via the operation key 104 when the zoom operation ring 102 provided in the outer cylinder portion 111 of the fixed barrel 110 is rotated, and the cam barrel 120. Go straight while rotating.
By rotation and rectilinear movement of the cam cylinder 120, the first lens frame F1 (first lens group L1), the second lens frame F2 (second lens group L2), the blur correction unit 200 (fourth lens group L4), and the guide bar The holding cylinder 130 (the third lens group L3 and the fifth lens group L5) moves straight in a predetermined relationship and is relatively displaced in the direction of the optical axis OA, and the focal length is changed (zooming).
The blur correction unit 200 moves and drives the held fourth lens unit L4 in a plane orthogonal to the optical axis OA so as to cancel the image movement on the imaging plane caused by camera shake or the like so as to correct the image blur. Act on.

Next, the mounting structure of the third lens group L3 (third lens frame F3), the fifth lens group L5 (fifth lens frame F5), and the main guide bar 141 to the guide bar holding cylinder 130 will be described in detail. To do.
As described above, the guide bar holding cylinder 130 is a cylindrical member, and is fitted and disposed inside the cam cylinder 120 so as to be slidable and rotatable in the optical axis direction.
The guide bar holding cylinder 130 is attached to a cylindrical base cylinder part 131 having a predetermined length, a third group flange 131F attached to the inner periphery near the front side of the base cylinder part 131, and an end face on the back side. A fifth group flange 132 is provided. These flanges hold a pair of guide bars (a main guide bar 141 and a sub guide bar 142) that support the shake correction unit 200 (fourth lens unit L4) so as to be able to move linearly.

The third group flange 131F is formed in an annular shape with a predetermined inner diameter on the inner periphery of the base tube portion 131. The third group flange 131F has a predetermined thickness in the direction of the optical axis OA. The rear surface is a third group mounting surface 131P orthogonal to the optical axis OA. In the third group mounting surface 131P, three group screw holes 131S for fixing the third lens frame F3 are provided, for example, at three locations in the circumferential direction.
A third lens frame F3 that holds the third lens group L3 is fastened to a third group mounting surface 131P of the third group flange 131F by a third group fixing screw 134 that is screwed into the third group screw hole 131S. The third lens frame F3 and its mounting structure will be described in detail later.

The fifth group flange 132 has an annular shape with a predetermined thickness. The fifth group flange 132 is fastened to the end face on the back side of the base tube 131 by a fixing screw (not shown) and is integrally fixed.
On the back surface of the fifth group flange 132, a fifth group mounting surface 132P orthogonal to the optical axis OA is disposed. The fifth group mounting surface 132P is provided with a fifth group fixing screw hole 132S for fixing the fifth lens frame F5.
A fifth lens frame F5 that holds the fifth lens group L5 is fastened to the fifth group mounting surface 132P of the fifth group flange 132 by a fifth group fixing screw 135 that is screwed into the fifth group fixing screw hole 132S. . The fifth lens frame F5 and its mounting structure will be described in detail later.

  The main guide bar 141 and the sub guide bar 142 are round shaft members having a predetermined diameter. The main guide bar 141 and the sub guide bar 142 are supported at the ends by the third group flange 131F and the fifth group flange 132 of the base cylinder part 131, respectively, and in the vicinity of the inner periphery of the guide bar holding cylinder 130, the optical axis It is provided in parallel with OA. The arrangement positions of the main guide bar 141 and the sub guide bar 142 are set to be separated from each other by a predetermined amount in the circumferential direction.

  The main guide bar 141 and the sub guide bar 142 are press-fitted and fixed to guide bar support holes 131H formed in the third group flange 131F of the guide bar holding cylinder 130 at the front end portions 141A and 142A, respectively. The rear end portion 141 </ b> B of the main guide bar 141 is supported by the fifth group flange 132 via the eccentric collar 150.

The eccentric collar 150 is rotatably mounted on the fifth group flange 132 and supports the rear end portion 141B of the main guide bar 141.
As shown in FIG. 5, the eccentric collar 150 has a cylindrical shape having a two-step outer diameter of a base portion 151 and a small diameter portion 152. A guide bar support hole 153 into which the main guide bar 141 is fitted so as to be slidably rotatable without backlash on the end surface on the base 151 side is eccentric by a predetermined amount: e as shown in FIG. 5B. A predetermined depth is formed at the position. An operation slit 154 having a predetermined width and a predetermined depth is formed in the radial direction on the end surface on the small diameter portion 152 side.

  The eccentric collar 150 is fitted in an adjustment support hole 132A formed on the back side of the fifth group flange 132 so that the small-diameter portion 152 faces the back side and can be slidably rotated around an axis parallel to the optical axis OA. ing. The end portion on the back side of the main guide bar 141 is fitted in the guide bar support hole 153 of the eccentric collar 150 so as to be slidable and rotatable. Thereby, the eccentric collar 150 supports the end portion on the back side of the main guide bar 141.

According to the support structure of the main guide bar 141 by such an eccentric collar 150, as shown in FIG. 5, the operation slit 154 is operated by a driver or the like to rotate the eccentric collar 150 as indicated by an arrow R in FIG. Then, the end portion of the main guide bar 141 supported by the guide bar support hole 153 that is eccentric from the rotation center of the eccentric collar 150 is moved and operated with the eccentric amount e as a radius.
As a result, the main guide bar 141 is indicated by an arrow S in FIG. 5 with the front end portion supported by the guide bar support hole 131H of the third group flange 131F in the guide bar holding cylinder 130 as a fulcrum (by elastic deformation of the third group flange 131F). As shown, it swings and the angle with respect to the optical axis OA changes.

  As described above, the main guide bar 141 supports the shake correction unit 200 and guides its movement. Therefore, by changing the angle of the main guide bar 141 with respect to the optical axis OA, the fourth lens group L4 held by the shake correction unit 200 moves as indicated by an arrow T in FIG. The shift in the direction (shift direction) orthogonal to the optical axis OA of the lens barrel 100 can be adjusted (aligned).

Next, a fixing structure of the third lens frame F3 to the third group mounting surface 131P of the third group flange 131F in the base tube portion 131 will be described.
As shown in FIG. 4, the third lens frame F3 includes a disc-shaped mounting flange 162 having a predetermined thickness and a predetermined diameter on the outer periphery of the holding cylinder portion 161 that holds the third lens unit L3.
The front surface of the mounting flange 162 is formed as a positioning surface 163 orthogonal to the optical axis of the third lens unit L3 held by the holding cylinder 161. Further, the mounting flange 162 includes a positioning fitting hole 164 and a detent engagement portion 165 at positions corresponding to the main guide bar 141 and the sub guide bar 142, respectively. Further, the mounting flange 162 is provided with a fixing hole 166 to the third group flange 131 </ b> F in the guide bar holding cylinder 130.

The positioning fitting hole 164 is formed so as to be fitted to the main guide bar 141 in the guide bar holding cylinder 130 so as to be slidably movable with a predetermined fitting tolerance.
The anti-rotation engaging portion 165 is formed in a U-shape that opens to the outside, and the width (interval of the opposing surfaces) is set so that the sub guide bar 142 is slidably fitted.

In the third lens frame F3, the positioning fitting hole 164 is fitted into the main guide bar 141, and the anti-rotation engaging portion 165 is slidably engaged with the sub guide bar 142. Then, with the positioning surface 163 and the third group mounting surface 131P of the third group flange 131F being in surface contact, the third group fixing screw 134 is screwed into the third group screw hole 131S of the third group flange 131F via the fixing hole 166. By doing so, it is fixed to the third group flange 131F.
The diameter of the fixing hole 166 is set to be larger by a predetermined amount than the diameter of the third group fixing screw 134 so as to allow movement of the third lens frame F3 in the direction orthogonal to the optical axis OA when adjusting the optical axis. Has been.

In such a structure for mounting the third lens frame F3 to the third group flange 131F in the guide bar holding cylinder 130, the tilt (tilt) of the third lens frame F3 with respect to the plane orthogonal to the optical axis OA is different from that of the third group flange 131F. It is defined by the third group mounting surface 131P.
On the other hand, the position (shift) of the third lens unit L3 in the direction orthogonal to the optical axis OA is defined by the inclination of the main guide bar 141.
Further, the eccentricity between the shake correction unit 200 engaged with the guide bar 141 and the mounting flange 162 can be reduced.

  For this reason, when the shift direction of the third lens unit L3 is adjusted by adjusting the angle of the main guide bar 141 by rotating the eccentric collar 150, the adjustment is facilitated.

Next, a structure for fixing the fifth lens frame F5 to the fifth group mounting surface 132P of the fifth group flange 132 in the base tube portion 131 will be described.
The fifth lens frame F5 includes a disc-shaped mounting flange 172 having a predetermined thickness and a predetermined diameter on the outer periphery of the holding cylinder portion 171 that holds the fifth lens unit L5.
The front surface of the mounting flange 172 is formed as a positioning surface 173 orthogonal to the optical axis of the fifth lens unit L5 held by the holding cylinder portion 171. The mounting flange 172 is provided with a fixing hole 174 to the fifth group flange 132. The fixing hole 174 is set to a diameter having a predetermined adjustment clearance with respect to the outer diameter of the fifth group fixing screw 135.

The fifth lens frame F5 has its positioning surface 173 in contact with the fifth group mounting surface 132P of the fifth group flange 132 and is screwed into the fifth group fixing screw hole 132S of the fifth group flange 132 via the fixing hole 174. It is fixed to the fifth group flange 132 by a fifth group fixing screw 135.
According to the fixing structure of the fifth lens frame F5 (fifth lens group L5) to the fifth group flange 132 in the base tube portion 131, the fifth lens frame F5 is orthogonal to the optical axis OA of the fifth lens group L5. The inclination with respect to the surface is defined by the fifth group mounting surface 132P of the fifth group flange 132.
Further, the position (shift) of the fifth lens unit L5 in the direction orthogonal to the optical axis OA is set between the fifth group fixing screw 135 and the fixing hole 174 by loosening the fifth group fixing screw 135 that is fixed to the fifth group flange 132. It can be adjusted within the range of adjustment clearance.

  According to the mounting structure of the third lens group L3 (third lens frame F3), the fifth lens group L5 (fifth lens frame F5), and the main guide bar 141 to the guide bar holding cylinder 130 as described above. The main guide bar 141 swings about the front end as a fulcrum by the rotation of the eccentric collar 150. By this swing, the fourth lens unit L4 in the shake correction unit 200 supported by the swing is moved in a direction orthogonal to the optical axis OA, and the position of the lens barrel 100 in the direction orthogonal to the optical axis OA is adjusted (adjusted). Mind)

In the third lens unit L3, the inclination with respect to the surface orthogonal to the optical axis OA is defined by the third group mounting surface 131P of the third group flange 131F, and the position in the direction orthogonal to the optical axis OA is defined by the main guide bar 141.
Thus, even if the optical axis of the fourth lens unit L4 is adjusted (alignment) by adjusting the angle of the main guide bar 141 by rotating the eccentric collar 150, the optical axis of the third lens unit L3 and the fourth lens unit L4 are adjusted. Can be suppressed from occurring with respect to the optical axis.

Further, when the main guide bar 141 is adjusted with respect to the optical axis of the third lens unit L3, the fourth lens unit L4 supported by the main guide bar 141 moves (shifts) in a direction orthogonal to the optical axis OA. At the same time, a tilt (tilt) occurs with respect to a plane orthogonal to the optical axis OA.
In this configuration, since the third lens unit L3 is positioned with respect to the main guide bar 141, there is little difference between the adjustment amount at which the shift becomes zero and the adjustment amount at which the tilt becomes zero. Therefore, a better optical performance adjustment result can be obtained.

The positioning fitting hole 164 and the anti-rotation engaging portion 165 have a slight clearance with respect to the main guide bar 141 and the sub guide bar 142, and this is an allowable amount of eccentricity in the direction orthogonal to the optical axis OA. On the other hand, it is a very small amount.
On the other hand, since the third lens unit L3 is located in the vicinity of the swing fulcrum when the main guide bar 141 is aligned, the clearance of the positioning fitting hole 164 with respect to the swing of the main guide bar 141 is sufficiently large.

  In the fifth lens unit L5, the inclination with respect to the surface orthogonal to the optical axis OA is defined by the fifth group mounting surface 132P of the fifth group flange 132, and the position in the direction orthogonal to the optical axis OA is positioned at the fifth group fixing screw 135 and the fixing hole 174. Can be adjusted within the range of adjustment clearance.

The optical axis adjustment of the third lens unit L3, the fourth lens unit L4, and the fifth lens unit L5 held by the guide bar holding cylinder 130 in the above configuration forms an image of an infinite circular point light source in the telephoto state. The eccentric collar 150 is rotated (the main guide bar 141 is swung) while confirming the direction and amount of the frame generated at the image formation point, and the eccentric collar 150 is fixed at the position where the frame is minimized.
For example, an adhesive is filled between the inner periphery of the adjustment support hole 132A in the fifth group flange 132 and the outer periphery of the small-diameter portion 152 in the eccentric collar 150, and both are fixed.

As described above, this embodiment has the following effects.
(1) The main guide bar 141 swings about the front end portion as a fulcrum by the rotation of the eccentric collar 150, and adjusts the angle of the fourth lens unit L4 with respect to the plane orthogonal to the optical axis OA in the supported blur correction unit 200. be able to.

(2) In the third lens unit L3, the inclination with respect to the surface orthogonal to the optical axis OA is defined by the third group mounting surface 131P of the third group flange 131F, and the position in the direction orthogonal to the optical axis OA is defined by the main guide bar 141. Is done. Thus, even if the optical axis of the fourth lens unit L4 is adjusted (alignment) by adjusting the angle of the main guide bar 141 by rotating the eccentric collar 150, the optical axis of the third lens unit L3 and the fourth lens unit L4 are adjusted. Can be suppressed from occurring with respect to the optical axis. As a result, there is little decentration between the third lens unit L3 and the fourth lens unit L4, and degradation of optical performance can be reduced.
In addition, when the optical axis of the fourth lens unit L4 is adjusted (alignment), there is a good correlation between shift and tilt, and alignment is easy to follow.

(3) In the fifth lens unit L5, the inclination with respect to the plane orthogonal to the optical axis OA is defined by the fifth group mounting surface 132P of the fifth group flange 132, and the position in the direction orthogonal to the optical axis OA is the fifth group fixing screw 135. Adjustment is possible within the range of adjustment clearance between the fixing holes 174.

(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 above-described embodiment, the present invention is applied to a configuration in which the shake correction unit 200 including the fourth lens unit L4 that is a shake correction optical system is supported and guided by the main guide bar 141. However, the optical system guided by the guide bar is not limited to the blur correction optical system, and may be another optical element. Further, the configuration of the entire optical system is not limited to the present embodiment.

(2) In the above embodiment, the main guide bar 141 is swung by the eccentric collar 150 to adjust the optical axis of the shake correction unit 200 (fourth lens unit L4), but the sub guide bar 142 is swung in the same manner. The optical axis may be adjusted by operation.

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

  1: Camera, 10: Camera body, 16: Image sensor, 100: Lens barrel, 130: Guide bar holding tube, 131: Base tube, 131F: 3 group flange, 131H: Guide bar support hole, 131P: 3 group Mounting surface, 131S: 3rd group screw hole, 132: 5th group flange, 132A: Adjustment support hole, 132H: Guide bar support hole, 132P: 5th group mounting surface, 132S: 5th group fixing screw hole, 141: Main guide bar, 142: Sub guide bar, 150: Eccentric collar, 153: Guide bar support hole, 163: Positioning surface, 164: Positioning fitting hole, 165: Detent engagement portion, 166: Fixing hole, 173: Positioning surface, 174: Fixed hole, 200: blur correction unit, 210: base frame, 220: anti-vibration lens holding frame, 230: guide bearing portion, 240: anti-rotation engaging portion, F3: third Lens frame, F5: the fifth lens frame

Claims (9)

A guide bar that engages with a first holding frame that holds the first optical member and guides the first holding frame in the optical axis direction of the first optical member;
A base portion extending in the optical axis direction; a first support portion protruding from the base portion in an orthogonal direction substantially orthogonal to the optical axis to support one end of the guide bar; and a guide bar protruding from the base portion in the orthogonal direction. A second support part that supports the other end of the guide bar via a cylindrical eccentric member that is eccentric with respect to the central axis of the guide bar, and a guide bar holding member having
A second holding frame that holds the second optical member, the guide bar is inserted, at least a part of which is in surface contact with the first support portion, and a relative position with respect to the guide bar holding member is fixed;
A third holding frame that holds the third optical member and is fixed at least partially in contact with the inner peripheral side of the portion of the second support portion where the eccentric member is provided;
Bei to give a,
With respect to the optical axis direction, the second support portion and the third holding frame are provided between a lens mount that is detachably engaged with a camera mount of a camera body, and the first holding frame ,
A lens barrel characterized by The lens barrel according to claim 1,
The lens barrel according to claim 1, wherein a surface of the first support portion with which the second holding frame is in surface contact is a surface facing the other end side of the guide bar. The lens barrel according to claim 1 or 2,
The base is substantially cylindrical,
The lens barrel, wherein the first support part and the second support part protrude in an orthogonal direction from an inner peripheral surface of the base part. The lens barrel according to any one of claims 1 to 3,
One end of the guide bar is press-fitted into the first support part,
The lens barrel, wherein the second holding frame is screwed to the first support portion with a fixing screw. The lens barrel according to any one of claims 1 to 4, wherein
The second support portion supports an outer peripheral surface of the other end of the guide bar via the eccentric member;
A lens barrel characterized by The lens barrel according to any one of claims 1 to 5,
A third holding frame is attached to the second support part,
An adjustment member that adjusts the position of the third holding frame in the orthogonal direction with respect to the second support portion;
A lens barrel characterized by The lens barrel according to any one of claims 1 to 6,
The guide bar engages with a main guide bar that engages with a round hole of the first holding frame and determines a position of the first holding frame in the orthogonal direction, and engages with a U-shaped groove of the first holding frame. A sub-guide bar that prevents circumferential rotation about the optical axis of the first holding frame;
The first support portion supports one end of the main guide bar,
The lens barrel, wherein the main guide bar is inserted through the second holding frame. The lens barrel according to any one of claims 1 to 7,
The guide bar engages with a main guide bar that engages with a round hole of the first holding frame and determines a position of the first holding frame in the orthogonal direction, and engages with a U-shaped groove of the first holding frame. The optical axis of the first holding frame and a sub guide bar for preventing circumferential rotation around the axis,
The base portion and the second support portion are separate members,
The lens barrel, wherein the second support portion is an annular member that integrally holds the other end of the main guide bar and the other end of the sub guide bar.   An imaging device comprising the lens barrel according to claim 1.

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