JP5895464B2 - Lens barrel and imaging device - Google Patents

Description

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

  2. Description of the Related Art Conventionally, in a mechanically interlocked zoom lens having an optical system with a large movement amount of each group such as a high magnification zoom, there is a lens in which each group is guided straight by a guide bar (for example, see Patent Document 1).

JP 2010-66690 A

  However, when the anti-vibration unit is suspended by the guide bar, there is a possibility that the guide bar is deformed due to resonance or the like due to the reaction force of the voice coil motor for anti-vibration driving and the concentration of the load, and the optical performance is deteriorated.

  An object of the present invention is to provide a lens barrel and an imaging apparatus in which deterioration of optical performance is prevented.

The present invention is, that solve the problems by following such a solution.

The lens barrel of the embodiment holds a base frame suspended by a main guide bar and a sub-guide bar, and a vibration-proof lens, and holds the vibration-proof lens movable in two directions orthogonal to the base frame. A frame, a first voice coil motor that moves the anti-vibration lens holding frame in a first direction relative to the base frame, and a second voice coil motor that moves in a second direction having a component orthogonal to the first direction The first voice coil motor and the second voice coil motor are provided on one side of a first straight line passing through the main guide bar and the sub guide bar in the vibration isolation unit. The first voice coil motor is arranged in a region divided into four by the first straight line and a second straight line orthogonal to the first straight line and passing through the center of the lens. Of the two regions of said one side of said in the first region of the main guide bar side is located closer to the second first straight line of the straight line, the second voice coil motor, the 4 Of the divided regions, of the two regions on the one side, the second region on the sub guide bar side is disposed at a position closer to the second straight line than the first straight line It was.
In addition, the lens barrel of another embodiment holds a base frame suspended by a main guide bar and a sub guide bar, and an anti-vibration lens, and is movable in two directions orthogonal to the base frame. An anti-vibration lens holding frame, a first voice coil motor that moves the anti-vibration lens holding frame in a first direction relative to the base frame, and a second that moves in a second direction having a component orthogonal to the first direction. An anti-vibration unit having a voice coil motor, and in a circumferential direction around the optical axis of the anti-vibration lens, at least a part of the main guide bar, at least a part of the first voice coil motor, At least a part of the second voice coil motor and at least a part of the sub guide bar are arranged in order, and pass through the main guide bar and the sub guide bar. When the straight line and the second straight line orthogonal to the first straight line and passing through the optical axis are divided into four, the distance between the first straight line and the first voice coil motor in the circumferential direction is The configuration is smaller than the distance between the second straight line and the first voice coil motor in the circumferential direction .
Furthermore, the imaging device of the embodiment is configured to include the lens barrel.

  According to the present invention, it is possible to provide a lens barrel and an imaging apparatus in which deterioration of optical performance is prevented.

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 imaging lens in FIG. FIG. 3 is a partially enlarged cross-sectional view of the imaging lens at a cross-sectional position different from that of FIG. 2. It is an external appearance perspective view of a vibration isolator unit. It is the figure which removed the front cover of the vibration isolator and was seen from the front side. It is a conceptual diagram explaining a diaphragm interlocking mechanism. It is the figure which removed the front cover of the vibration isolator which shows the modification of this invention, and was seen from the front side.

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. Further, 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, and a diaphragm unit 150 that adjusts the amount of incident light by changing the aperture diameter.

  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 the control device 18 controls and drives a focusing motor, an aperture unit, and the like in the lens barrel 100. It is supposed to be.

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. Image data captured by the image sensor 16 is recorded in a recording unit (not shown). Thereby, photographing is performed.

  Next, the lens barrel 100 will be described in detail with reference to FIGS. 2 to 6 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. 4A and 4B are external views of the image stabilization unit 200, where FIG. 4A is a perspective view as viewed from the front side and FIG. 4B is as viewed from the back side. FIG. 5 is a view as seen from the front side with the front cover of the image stabilization unit 200 removed. FIG. 6 is a conceptual diagram illustrating the diaphragm interlocking mechanism 300.

  As described above, the lens barrel 100 is a zoom lens capable of variably adjusting the focal length, and includes a cam barrel 120, a guide bar holding barrel 130, an aperture unit 150, and five groups within the fixed barrel 110. 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 an image stabilization unit 200 that corrects image movement on an image plane caused by camera shake or the like, and the fourth lens unit L4 is an image stabilization optical system that constitutes the image stabilization unit 200. is there.

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.

A space having a predetermined interval in the radial direction is formed between the outer cylinder portion 111 and the fixed inner cylinder 112, and a focusing motor (not shown) or the lens as shown in FIGS. 1 and 2 is formed in the space. A control board 103 constituting a lens control unit that controls the lens barrel 100 is provided.
As shown in FIG. 3, the fixed inner cylinder 112 includes a rectilinear groove 113 that guides the movement of the guide bar holding cylinder 130 and a cam groove 114 that moves and drives 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 image stabilization 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. It is like that.

  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. In the guide bar holding cylinder 130, the third lens group L3 is fixed via the third lens frame F3 in the vicinity of the front end portion thereof, and the fifth lens group L5 is connected to the rear end portion via the fifth lens frame F5. Is fixed.
In addition, a pair of guide bars (a main guide bar 141 and a sub guide bar 142) are disposed inside the guide bar holding cylinder 130 in parallel with the optical axis OA. The vibration unit 200 (fourth lens unit L4) is supported so as to be movable in a straight line.

  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, and the tip of the follower pin 133 slides in a rectilinear groove 113 formed on the inner periphery of the fixed inner cylinder 112. It is fitted so that it can be moved. Thereby, the guide bar holding cylinder 130 is moved and driven by the inner cylinder cam groove 123 while being regulated by the straight movement groove 113 as the cam cylinder 120 rotates and goes straight, so that the guide bar holding cylinder 130 moves straight.

The image stabilization unit 200 has a disc-like schematic shape with a predetermined thickness, and holds the fourth lens unit L4, which is a shake correction optical system, so as to be movable in a plane perpendicular to the optical axis OA.
The anti-vibration unit 200 includes a guide bearing portion 230, a detent engagement portion 240, and a follower pin 201 on the outer periphery thereof.

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 vibration isolation unit 200.
As shown in FIG. 3, the follower pin 201 penetrates (freely fits) the guide bar holding cylinder 130 and is slidably fitted into the fourth group cam groove 124 of the cam cylinder 120 located on the outer peripheral side thereof. .

In the vibration isolating 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. The guide bar holding cylinder 130 is guided by the sub guide bar 142 and rotated by the sub guide bar 142 so that it can move straight without rotating.
When the cam cylinder 120 rotates and goes straight, the vibration isolating unit 200 operates the follower pin 201 by the fourth group cam groove 124, and moves straight along the main guide bar 141.
That is, the image stabilization unit 200 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. It is designed to move straight ahead.

The image stabilization unit 200 moves and drives the held fourth lens unit L4 in a plane orthogonal to the optical axis OA so as to cancel image movement on the imaging plane caused by camera shake or the like, so as to correct image blur. Act on.
Details of the guide bar holding cylinder 130 and the vibration isolation unit 200 will be described later.

The aperture unit 150 is provided on the front side of the guide bar holding cylinder 130.
The aperture unit 150 adjusts the aperture diameter by an operation on the camera body 10 side through an aperture interlocking mechanism 300 (shown in FIG. 6, not shown in FIGS. 1 to 3), which will be described in detail later.

When the zoom operation ring 102 provided on the outer cylinder portion 111 of the fixed lens barrel 110 is rotated, the lens barrel 100 configured as described above is rotated via the operation key 104 and cams. The cylinder 120 goes straight while rotating.
As the cam cylinder 120 rotates and goes straight, the first lens frame F1 (first lens group L1), the second lens frame F2 (second lens group L2), the image stabilization 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).

Next, the guide bar holding cylinder 130 and the vibration isolation unit 200 will be described in detail.
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 includes a cylindrical base cylinder part 131 having a predetermined length, a fifth group flange 132 fixed to the end face on the back side of the base cylinder part 131, and a vibration isolation unit 200 (fourth lens group L4). And a pair of guide bars (a main guide bar 141 and a sub guide bar 142) for supporting a straight movement.

A small-diameter third group flange 131F is formed on the inner periphery in the vicinity of the front surface side of the base tube portion 131. In addition, the follower pin 133 protrudes from the outer peripheral surface of the base tube portion 131 as described above.
The fifth group flange 132 is an annular member having an inner diameter corresponding to the third group flange 131F, and is fastened and fixed to an end surface on the back surface side of the base tube portion 131 with a screw (not shown).

The main guide bar 141 and the sub guide bar 142 are round shaft-shaped members each having a predetermined diameter, and the end portions thereof are fixed to the third group flange 131F and the fifth group flange 132 of the base tube part 131, respectively. In the vicinity of the inner periphery of the holding cylinder 130, it is provided in parallel with the optical axis OA.
The arrangement positions of the main guide bar 141 and the sub guide bar 142 in the circumferential direction are set in relation to voice coil motors 250X and 230Y in a vibration isolation unit 200 described later. This will be described in detail later.

The guide bar holding cylinder 130 is disposed inside the cam cylinder 120 so as to be rotatable and rectilinearly movable, and the follower pin 133 planted on the outer peripheral surface is the inner cylinder cam groove formed in the cam cylinder 120 as described above. 123 is slidably fitted into the through hole 123 and its tip is fitted in a rectilinear groove 113 formed on the inner periphery of the fixed inner cylinder 112 so as to be slidable.
As a result, the guide bar holding cylinder 130 is moved and driven by the inner cylinder cam groove 123 while being regulated by the rectilinear groove 113 as the cam cylinder 120 rotates and goes straight.

As described above, the third lens group L3 is fixed to the third group flange 131F of the base tube portion 131 of the guide bar holding cylinder 130 on the back surface via the third lens frame F3.
The fifth lens unit L5 is fixed to the end of the guide bar holding tube 130 on the back side of the fifth group flange 132 via the fifth lens frame F5.

Next, the image stabilization unit 200 will be described.
The image stabilization unit 200 includes a base frame 210, an image stabilization lens holding frame 220, and a pair (two sets) of voice coil motors 250 </ b> X and 250 </ b> Y that move and drive the image stabilization lens holding frame 220 with respect to the base frame 210. ing. Hereinafter, the voice coil motor is abbreviated as VCM.

The base frame 210 has a disk shape with a predetermined thickness, and includes a guide bearing portion 230, a detent engagement portion 240, and a follower pin 201 on the outer peripheral surface thereof. The arrangement positions of the guide bearing portion 230, the anti-rotation engagement portion 240, and the follower pin 201 will be described in detail later.
A swing lever 320 in a diaphragm interlocking mechanism 300 (shown in FIG. 6, not shown in FIGS. 1 to 3), which will be described later, is pivotally attached to the outer periphery of the base frame 210 by a pivot pin 301. The mounting position of the swing lever 320 in the circumferential direction of the vibration isolation unit 200 is set in relation to the guide bar 140, which will be described in detail later.

Further, a unit substrate 202 is mounted on the back side of the base frame 210. The unit substrate 202 is provided with a joint portion 203 </ b> A for connecting to the control substrate 103 disposed in the fixed lens barrel 110 via a flexible printed circuit board (FPC) 203.
The FPC 203 is arranged so as to be bent and reversed in the direction of the optical axis OA and to be polymerized by a predetermined amount in the radial direction in order to allow relative rectilinear displacement of the vibration isolation unit 200 with respect to the fixed barrel 110 (control board 103). .

The FPC 203 supplies a control signal and drive power from the control board 103 to a VCM 250 (250X, 250Y) described later.
The connection position of the FPC 203 in the circumferential direction of the image stabilization unit 200 (unit board 202) is set in relation to the guide bar 140, which will be described in detail later.

  The anti-vibration lens holding frame 220 has a disk shape with a predetermined thickness, and holds the fourth lens unit L4 in the center. The anti-vibration lens holding frame 220 is biased in the direction approaching the base frame 210 by a biasing means such as a spring (not shown), and a ball (not shown) interposed between the base frame 210 rolls. Thus, it can move smoothly in a direction perpendicular to the optical axis OA without being displaced in the direction of the optical axis OA.

  Although not shown in detail, the VCMs 250X and 250Y are configured by a coil provided in the base frame 210, and a driving magnet and a yoke provided at a position facing the anti-vibration lens holding frame 220. The VCMs 250X and 250Y move and drive the anti-vibration lens holding frame 220 (fourth lens unit L4), to which the drive magnet and the yoke are fixed, in a plane orthogonal to the optical axis OA by passing a current through the coil.

One VCM 250X has the drive direction as the X axis direction on the X axis minus side centered on the optical axis OA, and the other VCM 250Y has the drive direction as the Y axis direction on the Y axis plus side centered on the optical axis OA. Are arranged on the same circumference (positions at equal distances from the optical axis OA).
With such an arrangement of the VCMs 250X and 250Y, the anti-vibration lens holding frame 220 (fourth lens unit L4) can be moved and driven in an arbitrary direction in a plane orthogonal to the optical axis OA by combining both driving. It is like that.

Next, the diaphragm interlocking mechanism 300 that operates the diaphragm unit 150 will be described.
As shown in FIG. 6, the aperture interlocking mechanism 300 includes an aperture operation ring 310 and a swing lever 320. FIG. 6 shows a simplified configuration of the diaphragm interlocking mechanism 300, and components that are not directly related are omitted.

The aperture operation ring 310 is configured by extending an aperture operation arm 312 from an annular portion 311.
Although the aperture operation ring 310 is not shown in FIGS. 1 to 3, the annular portion 311 is rotatably mounted inside the lens mount LM fixed to the base end portion of the lens barrel 100. The aperture operation ring 310 is urged to rotate in the direction of opening the aperture blades in the aperture unit 150 by an aperture operation ring urging spring (not shown). The aperture operation ring 310 is rotated by a lens-side interlocking unit (not shown) operated by a body-side interlocking unit (not shown) provided in the camera body 10.

  The aperture operation arm 312 extends in parallel with the optical axis OA from the outer peripheral edge portion of the annular portion 311 toward the front surface side. An engagement slit 313 is formed in the aperture operation arm 312 along the extending direction. An engagement protrusion 321 of a swing lever 320 described later is fitted in the engagement slit 313, whereby the rotation of the aperture operation ring 310 is transmitted to the swing lever 320.

The swing lever 320 has a predetermined length, and is pivotally supported by a pivot pin 301 on the outer peripheral surface of the base frame 210 of the vibration isolation unit 200 at a substantially center thereof. The pivot position of the swing lever 320 to the vibration isolation unit 200 will be described in detail later.
Engaging protrusions 321 and 322 are provided at both ends of the swing lever 320, respectively. One (back side) engagement protrusion 321 is fitted in the engagement slit 313 of the aperture operation arm 312. The other engaging protrusion 321 is engaged with the operation arm 151 in the aperture unit 150.

  An operation arm 151 in the aperture unit 150 extends in parallel with the optical axis OA from an aperture operation plate 152 that adjusts the aperture amount of the aperture blades by rotation about the optical axis OA. An operation slit 153 is formed along the extending direction of the operation arm 151, and the engagement protrusion 321 of the swing lever 320 is fitted to the operation slit 153.

  In the diaphragm interlocking mechanism 300 configured as described above, the rotation of the diaphragm operation ring 310 causes the swing lever 320 to swing through the diaphragm operation arm 312, and the swing of the swing lever 320 passes through the diaphragm operation arm 151. Then, the aperture operation plate 152 of the aperture unit 150 is rotated. Thereby, the aperture amount of the aperture blade in the aperture unit 150 is adjusted.

  During the zooming operation, the relative displacement in the straight direction between the guide bar holding cylinder 130 to which the aperture unit 150 is attached and the vibration isolating unit 200 to which the swing lever 320 is pivotally attached is the engagement protrusion on the swing lever 320. 321 and 322 are permitted by moving along the engagement slit 313 of the diaphragm operation arm 312 or the operation slit 153 of the operation arm 151 in the diaphragm unit 150.

  That is, in the diaphragm interlocking mechanism 300, the swinging lever 320 pivotally attached to the vibration isolating unit 200 moves the guide bar holding cylinder 130 straight and the guide bar holding cylinder 130 and the vibration isolating unit 200 (fourth lens group L4). The aperture operation ring 310 and the aperture operation plate 152 in the aperture unit 150 are interlocked while allowing relative displacement in the optical axis OA direction.

  Next, with reference to FIG. 5, the arrangement positions of the VCMs 250X and 250Y in the vibration isolation unit 200 with respect to the arrangement positions in the circumferential direction of the guide bars 140 (the main guide bar 141 and the sub guide bar 142) in the guide bar holding cylinder 130. The arrangement position of the follower pin 201 in the vibration isolation unit 200, the arrangement position of the FPC 203 with respect to the vibration isolation unit 200, and the arrangement position of the swing lever 320 in the diaphragm interlocking mechanism 300 with respect to the vibration isolation unit 200 will be described. .

The relationship between the arrangement positions of the VCMs 250X and 250Y in the image stabilization unit 200 and the arrangement positions in the circumferential direction of the guide bars 140 (the main guide bar 141 and the sub guide bar 142) in the guide bar holding cylinder 130 is as follows. Is set.
That is, VCM 250X and VCM 250Y are both positioned on one side in a region divided into two by the first straight line connecting the centers of main guide bar 141 and sub guide bar 142. Further, the VCM 250Y is closer to the first straight line than the second straight line (A1 <A2) in the first region divided into four by the first straight line and the second straight line passing through the optical axis OA and orthogonal to the first straight line. ).
That is, the VCM 250Y is disposed in the vicinity of the main guide bar 141. Thus, the moment can be suppressed while securing the distance between the main guide bar 141 and the sub guide bar 142, and the optical performance deterioration due to the vibrational eccentricity of the optical system can be suppressed.

The arrangement position of the follower pin 201 in the vibration isolation unit 200 is set to a position closer to the first straight line than the second straight line (B1 <B2).
That is, the follower pin 201 is disposed in the vicinity of the guide bearing portion 230 (main guide bar 141 fitting position). As a result, the cam drive efficiency can be improved, the eccentricity of the image stabilization unit 200 due to the drive force can be suppressed, and the reciprocal difference in optical performance depending on the zoom drive direction can be reduced.

The disposition position of the joint portion 203A of the FPC 203 with respect to the image stabilization unit 200 is set to a position (C1 <C2) closer to the first straight line than the second straight line.
That is, the FPC 203 is disposed in the vicinity of the main guide bar 141 in the image stabilization unit 200. Thereby, the eccentricity of the image stabilization unit 200 due to the FPC 203 pressing the image stabilization unit 200 with its strength (rigidity) can be suppressed, and deterioration of the optical performance can be reduced.

The position of the swing lever 320 in the diaphragm interlocking mechanism 300 with respect to the vibration isolation unit 200 is set to a position closer to the first straight line than the second straight line (D1 <D2).
That is, the swing lever 320 is disposed in the vicinity of the guide bearing portion 230 (fitting position of the main guide bar 141) in the vibration isolation unit 200. Accordingly, the vibration isolating unit 200 (fourth lens) is generated by a moment in a twisting direction with respect to an axis connecting the two guide bars 141 and 142 acting on the vibration isolating unit 200 when the diaphragm is driven and when the diaphragm spring is charged. The eccentricity of the group L4) can be suppressed, and optical performance deterioration can be suppressed.

As described above, this embodiment has the following effects.
(1) In the lens barrel 100, one of the VCM 250X and the VCM 250Y of the image stabilizing unit 200 is divided into two parts by a first straight line connecting the centers of the main guide bar 141 and the sub guide bar 142 in the guide bar holding cylinder 130. The VCM 250Y is disposed closer to the first straight line than the second straight line and in the vicinity of the main guide bar 141. As a result, the moment can be suppressed while securing the distance between the two guide bars 141 and 142, and optical performance deterioration due to vibrational eccentricity of the optical system can be suppressed.

(2) The follower pin 201 of the vibration isolation unit 200 is disposed closer to the first straight line than the second straight line, and in the vicinity of the guide bearing portion 230 (main guide bar 141 fitting position). As a result, the cam drive efficiency can be improved, the eccentricity of the image stabilization unit 200 due to the drive force can be suppressed, and the reciprocal difference in optical performance depending on the zoom drive direction can be reduced.

(3) The position of the FPC 203 with respect to the vibration isolation unit 200 is closer to the first straight line than the second straight line, and is disposed in the vicinity of the guide bearing portion 230 (main guide bar 141 fitting position) in the vibration isolation unit 200. Yes. Thereby, the eccentricity of the image stabilization unit 200 due to the FPC 203 pressing the image stabilization unit 200 with its rigidity can be suppressed, and the deterioration of the optical performance can be reduced.

(4) The position of the swing lever 320 in the diaphragm interlocking mechanism 300 relative to the vibration isolation unit 200 is closer to the first straight line than the second straight line, and the guide bearing portion 230 (the position where the main guide bar 141 is fitted) in the vibration isolation unit 200. ). As a result, the eccentricity of the image stabilization unit 200 (fourth lens unit L4) due to the moment acting on the image stabilization unit 200 at the time of aperture driving and at the time of aperture system spring charging can be suppressed, and optical performance deterioration can be suppressed.

(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 embodiment, the VCM 250Y is divided into four by the first straight line connecting the centers of the main guide bar 141 and the sub guide bar 142 and the second straight line passing through the optical axis OA and orthogonal to the first straight line. The position is set closer to the first line than the second line (A1 <A2) in one area, but the position setting of the other VCM 250X is not defined.

Therefore, as shown in FIG. 7, in addition to the setting of the above embodiment, the VCM 250X in the second region adjacent to the first region among the regions divided into four by the first straight line and the second straight line, It may be set to be a position (E1 <E2) closer to the first straight line than the second straight line. FIG. 7 is a view of the anti-vibration unit corresponding to FIG. 6 in the above embodiment as viewed from the front side with the front cover removed, and each component is denoted by the same reference numeral as in the above embodiment.
With such a configuration, the moment can be minimized, and the effect of suppressing optical performance deterioration due to vibrational eccentricity of the optical system can be further improved.

  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, 16: imaging device, 100: lens barrel, 120: cam barrel, 124: 4 group cam groove, 141: main guide bar, 142: sub guide bar, 150: aperture unit, 200: vibration isolation unit, 201: follower pin, 203: flexible printed circuit board (FPC), 210: base frame, 220: anti-vibration lens holding frame, 250X: voice coil motor, 250Y: voice coil motor, 300: aperture interlock mechanism, 301: pivot pin 320: rocking lever, L4: fourth lens group, OA: optical axis

Claims (8)

A base frame suspended by a main guide bar and a sub guide bar;
An anti-vibration lens holding frame that holds the anti-vibration lens and is movable in two directions orthogonal to the base frame;
A first voice coil motor for moving the anti-vibration lens holding frame in a first direction with respect to the base frame, and a second voice coil motor for moving in a second direction having a component orthogonal to the first direction ;
A vibration isolating unit having
The first voice coil motor and the second voice coil motor are arranged on one side of a first straight line passing through the main guide bar and the sub guide bar in the vibration isolation unit,
The first voice coil motor has two regions on one side of the region divided into four by the first straight line and a second straight line orthogonal to the first straight line and passing through the center of the lens. In the first region on the side of the main guide bar , being arranged at a position closer to the first straight line than the second straight line,
The second voice coil motor is configured to be more second than the first straight line in the second region on the sub guide bar side in the two regions on the one side of the four divided regions. A lens barrel characterized by being arranged at a position close to a straight line . A base frame suspended by a main guide bar and a sub guide bar;
An anti-vibration lens holding frame that holds the anti-vibration lens and is movable in two directions orthogonal to the base frame;
A first voice coil motor for moving the anti-vibration lens holding frame in a first direction with respect to the base frame, and a second voice coil motor for moving in a second direction having a component orthogonal to the first direction;
A vibration isolating unit having
At least a part of the main guide bar, at least a part of the first voice coil motor, at least a part of the second voice coil motor, and a sub guide in a circumferential direction around the optical axis of the vibration-proof lens At least some of the bars are arranged in order,
When divided into four by a first straight line passing through the main guide bar and the sub guide bar and a second straight line orthogonal to the first straight line and passing through the optical axis,
The distance between the first straight line and the first voice coil motor in the circumferential direction is smaller than the distance between the second straight line and the first voice coil motor in the circumferential direction. Tube . The lens barrel according to claim 1 ,
A cylindrical body is provided on the outer periphery of the vibration isolation unit and formed with a cam groove. A follower pin inserted into the cam groove is provided on the outer periphery of the base frame, and the follower pin is connected to the second straight line. The lens barrel is disposed closer to the first straight line than the first lens line. The lens barrel according to claim 1 or 2 ,
The vibration isolation unit has an engaging portion that engages with an aperture interlocking mechanism that opens and closes the aperture of the lens barrel, and the engaging portion is disposed closer to the first straight line than the second straight line. A lens barrel. The lens barrel according to any one of claims 1 to 4 ,
The anti-vibration unit includes a flexible printed circuit board joint that supplies power to the first voice coil motor and the second voice coil motor, and the joint is closer to the first straight line than the second straight line. A lens barrel characterized by being disposed on the lens.   The lens barrel according to any one of claims 1 to 5,
  A lens barrel characterized in that a straight line passing through the center position in the circumferential direction of the first voice coil motor and parallel to the first direction passes through the optical axis.   The lens barrel according to any one of claims 1 to 6,
  The lens barrel, wherein the first straight line does not pass through the optical axis. An imaging device comprising the lens barrel according to any one of claims 1 to 7 .

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