JP5157389B2 - Position detection device, blur correction device, and optical instrument - Google Patents

Description

  The present invention relates to a position detection device, a shake correction device, and an optical apparatus.

In a camera shake correction optical system, a position detection element such as a Hall element is mounted on a flexible printed wiring board and is provided opposite to a position detection magnet so as to detect the shift movement amount of the camera shake correction optical system. What was made is known (refer patent document 1).

JP 2007-219251 A

However, since the position detection device described in Patent Document 1 has a structure in which the flexible printed wiring board and the position detection element are bonded and fixed to the base member, the distance between the position detection element and the position detection magnet when the adhesive force is weakened. There was a problem that could not be maintained properly.

The problem to be solved by the present invention is to provide a position detection device, a shake correction device, and an optical apparatus that can maintain a position detection element at an appropriate position.

  The present invention solves the above problems by the following means. In addition, although the code | symbol corresponding to drawing which shows embodiment of this invention is attached | subjected and demonstrated, this code | symbol is only for making an understanding of this invention easy, and is not the meaning which limits this invention.

[1] A position detection device according to the present invention includes a fixed frame provided with a first position detection element and a second position detection element, a connecting portion, and the first position detecting element from the connecting portion. A first leg that extends in the direction and biases the first position detecting element; and a second leg that extends from the connecting portion in the direction of the second position detecting element. look including a second leg portion for urging includes an urging member which is composed of one leaf spring, the said fixing frame has a pair of projections, the connecting portion, the connecting portion Are formed side by side in the longitudinal direction, and have a pair of holes into which the projections are inserted, one of the pair of holes is a long hole, and the projections are inserted into the holes. The connecting portion is fixed to the fixed frame .
The position detection apparatus according to the present invention includes a fixed frame provided with a first position detection element and a second position detection element, a connection portion, and a direction from the connection portion to the first position detection element. A first leg that extends and biases the first position detection element, and extends from the connecting portion in the direction of the second position detection element and biases the second position detection element. A biasing member configured by a single leaf spring and an opposing member provided to face the fixed frame, and the opposing member includes a pair of protrusions. The connecting portion is formed side by side in the longitudinal direction of the connecting portion, and has a pair of holes into which the protrusions are inserted, and one of the pair of holes is a long hole, The protrusions are inserted into the connecting member, and the connecting portion is fixed to the opposing member by heat caulking.

In the above invention, the position detection element (238x, 238y) has a detection surface (238s) for performing position detection, and the biasing member (236) is the detection surface (238s) of the position detection element. It can comprise so that the surface on the opposite side may be urged | biased. In this case, the detection surface (238s) can be configured to face the fixed frame (232).

In the above invention, the first leg (2362) and the second leg (2363) of the biasing member (236) can be configured to be symmetrical.

In the above invention, a flexible printed wiring board (237) connected to the position detection element can be provided between the biasing member (236) and the position detection element (238x, 238y).

[2] A blur correction device (23) according to the present invention includes the position detection device according to the above-described invention and a blur correction unit (230) that corrects image blur using a signal output from the position detection device. It is characterized by that.

[3] An optical apparatus (1) according to the present invention includes the blur correction device (23).

  According to the present invention, the position detection element can be maintained at an appropriate position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram illustrating a camera according to the present embodiment. The camera 1 according to the present embodiment is a camera that includes a camera body 10 and a lens barrel 20 and shoots image light that has passed through the lens barrel 20 by forming an image on an imaging surface of an image sensor 11. The camera 1 of the present example shown in FIG. 1 has a lens barrel 20 built in the camera body 10, but the lens barrel 20 can be configured to be detachable from the camera body 10.

  The lens barrel 20 includes a photographing optical system including lens groups 21, 22, and 2311. Among them, the lens 2311 is provided in the shake correction unit 23 and can be shifted in a direction perpendicular to the optical axis L by a control signal from the shake correction control unit 230 in order to correct image blur on the image sensor 11. It is considered as a lens. FIG. 1 is a diagram schematically showing the blur correction unit 23, and its detailed structure is as shown in FIGS.

  FIG. 2 is an exploded perspective view showing the shake correction unit 23 according to the present embodiment, in which the left side is the subject side and the right side is the image sensor 11 side. FIG. 3 is an enlarged view of the presser plate 236 according to the present embodiment, in which (A) is a plan view and (B) is a cross-sectional view taken along line IIIB-IIIB in (A).

4 is a front view of the blur correction unit 23 according to the present embodiment as viewed from the subject side, and FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 4 is a view in which a part of the diaphragm frame 233 is cut away in order to explain the arrangement of the flexible printed wiring board 237. In addition, common XYZ coordinates are shown in each drawing shown below including FIG.

  As shown in FIG. 2, the shake correction unit 23 of this example includes an aperture frame 233, a holding plate 236, a fixed frame 232, a first lens holding frame 231, a second lens holding frame 234 and a lid member 235 from the subject side. I have. Although not shown in FIG. 2, a flexible printed wiring board 237 is provided at a position between the presser plate 236 and the fixed frame 232.

  The first lens holding frame 231 includes a blur correction lens 2311 at the center thereof, and coils 2312 and 2313 and position detection magnets 2314 and 2315 at predetermined positions around the first lens holding frame 231. A hook portion (not shown) for hooking a coil spring (tensile spring) 91 is provided at a predetermined position of the first lens holding frame 231 and the fixed frame 232, and the first lens holding frame 231 has the ball 240. And is supported by a coil spring (tensile spring) 91 so as to be biased to the fixed frame 232. On the other hand, the second lens holding frame 234 is incorporated in the lid member 235 by a bayonet method and is rotatable about the optical axis.

Further, on the inner diameter side of the second lens holding frame 234, a diameter fitting portion 94 that fits the convex portion 92 of the first lens holding frame 231 and a concave portion 93 that is not diameter-fitted are provided. When the blur correction is not performed, the second lens holding frame 234 has a first lens holding portion 94 having a diameter fitting portion 94 with the convex portion 92 of the first lens holding frame 231 provided on the inner diameter side of the second lens holding frame 234. The first lens holding frame 231 is held in the vicinity of the optical axis by rotating to a position where the diameter of the convex portion 92 of the frame 231 is fitted. On the other hand, when blur correction is performed, the second lens holding frame 234 rotates to a position where the concave portion 93 of the second lens holding frame 234 and the convex portion 92 of the first lens holding frame 231 face each other. The movement of the holding frame 231 is not hindered. Accordingly, the first lens holding frame 231 can move in a plane (X axis direction and Y axis direction) orthogonal to the optical axis L with respect to the fixed frame 232.

  The coils 2312 and 2313 are members constituting an actuator for shifting and driving the first lens holding frame 231 in an arbitrary direction within a plane orthogonal to the optical axis L, that is, within an XY plane. A coil 2313 for driving and a coil 2312 for driving in the Y-axis direction are fixed to the first lens holding frame 231 along the X-axis direction and the Y-axis direction, respectively. A voice for driving the first lens holding frame 231 in the XY plane by the coils 2312 and 2313 and magnets 2322 and 2323 (each including a yoke) fixed to the fixed frame 232 so as to oppose them. Configure a coil motor.

  Each of the position detection magnets 2314 and 2315 includes a yoke, and in order to detect the position of the first lens holding frame 231 in the XY plane, the position detection magnet 2314 in the X-axis direction and the position detection magnet 2315 in the Y-axis direction. Are fixed to the first lens holding frame 231 along the X-axis direction and the Y-axis, respectively. The position of the first lens holding frame 231 in the XY plane can be detected by these position detection magnets 2314 and 2315 and hall elements 238x and 238y described later.

  As described above, the magnets 2322 and 2323 constituting the voice coil motor are fixed to the fixed frame 232, which is a non-magnetic material, along the X-axis direction and the Y-axis direction, respectively. In addition, Hall elements 238x and 238y for detecting the position of the first lens holding frame 231 are mounted on the fixed frame 232 in a state of being mounted on the flexible printed wiring board 237. This point will be described in more detail with reference to FIGS.

As shown in FIGS. 4 and 5, a first recess 2321 to which one end of the flexible printed wiring board 237 is attached is formed on the main surface of the fixed frame 232 on the diaphragm frame 233 side. Further second recesses 2324 are formed in portions corresponding to the Hall elements 238x and 238y, respectively. The first recess 2321 is formed from the 12 o'clock position to the 9 o'clock position of the fixed frame 232 shown in FIG. 4, and the flexible printed wiring board 237 is bent to the outer peripheral side surface of the fixed frame 232 at the 12 o'clock position. It has been.

As shown in FIG. 5, the first recess 2321 is formed to have a depth t1 corresponding to the thickness of the flexible printed wiring board 237 and the thickness of the double-sided tape 239, and the second recess 2324 is formed of the flexible printed wiring board 237. And a depth t2 corresponding to the thickness of the Hall elements 238x and 238y.

The Hall elements 238x and 238y are mounted on one end of the flexible printed wiring board 237 by means such as soldering. When the flexible printed wiring board 237 is mounted on the fixed frame 232, the hall element 238x is mounted on the X axis of the fixed frame 232 at a position facing the position detection magnet 2314 of the first lens holding frame 231. The Hall element 238y is mounted on the Y axis of the fixed frame 232 and at a position facing the position detection magnet 2315 of the first lens holding frame 231. At this time, the detection surfaces 238 s of the hall elements 238 x and 238 y face the position detection magnets 2314 and 2315.

  In this example, the flexible printed wiring board 237 is fixed to the fixed frame 232 using the double-sided tape 239, but an adhesive means other than the double-sided tape 239 can also be used. Further, since the Hall elements 238x and 238y are pressed by the pressing plate 236 as will be described later, the adhesive force of the double-sided tape 239 and other bonding means can be at least enough to temporarily fix the flexible printed wiring board 237. Furthermore, a double-sided tape or other adhesive means can be omitted if necessary.

  Returning to FIG. 2, the aperture frame 233 is fixed to the subject side of the fixed frame 232 by screws (not shown) or the like. A pair of protrusions 2331 are formed on the fixed frame 232 side of the diaphragm frame 233, and the presser plate 236 is fixed thereto by means such as heat caulking.

  3A is a plan view showing the presser plate 236 of this example, and FIG. 3B is a cross-sectional view taken along line IIIB-IIIB. The holding plate 236 of the present example is configured by bending a plate material such as stainless steel, and includes a flat connecting surface 2361 at the center, and the first leg 2362 and the second leg 2363 extending symmetrically from the connecting surface 2361. Is provided.

The planar connecting surface 2361 is formed with a hole 2364 into which one of the protrusions 2331 is inserted and a long hole 2365 into which the other of the protrusions 2331 is inserted. By inserting one of the protrusions 2331 into the hole 2364 and fixing with heat caulking, the presser plate 236 can be positioned with respect to the aperture frame 233. Further, by inserting the other of the protrusions 2331 into the long hole 2365 and fixing with heat caulking, the presser plate 236 can be prevented from rotating with respect to the aperture frame 233. In particular, by making one of the long holes 2365, even if the interval between the projections 2331 varies somewhat, if the positional accuracy of the projections 2331 to be positioned is obtained, the position of the press plate 236 relative to the diaphragm frame 233, and thus the press plate The positional accuracy with respect to the Hall elements 238x and 238y of 236 can be increased. Note that a single protrusion 2331 and a hole 2364 may be used as necessary.

The front ends of the first leg 2362 and the second leg 2363 are folded back so that the back sides of the Hall elements 238x and 238y can be pressed by the folded portions. Note that the back side of the Hall elements 238x and 238y can be suppressed at the tips of the first leg 2362 and the second leg 2363 without forming the folded portion, but the first leg 2362 and the second leg 2362 A sharp processing edge may be formed at the tip portion. Therefore, it is possible to minimize damage to the contact portion with the flexible printed wiring board 237 by pressing the back side of the Hall elements 238x and 238y at the folded portion.

  The presser plate 236 of this example includes a first leg 2362 and a second leg 2363 that are symmetrical with respect to the connecting surface 2361, but the first leg 2362 and the second leg 2363 are symmetrical. By doing so, the pressing force on the two Hall elements 238x and 238y can be made uniform. Further, by integrally configuring the first leg 2362 and the second leg 2363 via the connecting surface 2361, even when processing variation occurs in the presser plate 236, when the protrusion 2331 is caulked by heat, The left and right pressing balance can be finely adjusted. Note that the first leg 2362 and the second leg 2363 may be asymmetric as necessary.

  Returning to FIG. 2, the lid member 235 is fixed to the imaging element 11 side of the fixed frame 232 with screws (not shown) or the like with the first lens holding frame 231 and the second lens holding frame 234 sandwiched therebetween. As described above, since the ball 40 is interposed between the fixed frame 232 and the first lens holding frame 231 and between the second lens holding frame 234 and the lid member 235, the fixed frame 232 and the lid Although it is fixed to the member 235, the first lens holding frame 231 and the second lens holding frame 234 sandwiched between them can be driven to shift in the XY plane, whereby the blur correction lens 2311 can be driven. Shift driving can be performed in the XY plane. In FIG. 2, the ball 240 interposed between the second lens holding frame 234 and the lid member 235 is omitted, and is schematically shown in FIG.

  According to the camera 1 of the present embodiment configured as described above, the camera shake state of the camera 1 is detected by a gyro sensor (not shown) or the like, and the camera shake correction control unit 230 detects the camera shake correction lens 2311 based on the camera shake state. A shift driving amount in the XY plane is calculated. Then, positional information in the XY plane of the first lens holding frame 231 is input from the hall elements 238x and 238y via the flexible printed wiring board 237, and a shift driving amount is applied to the coils 2311 and 312, from the blur correction control unit 230. A control signal corresponding to is sent out. Thereby, the image blur on the image sensor 11 is corrected according to the hand shake state.

  In particular, for the position detection of the first lens holding frame 231 by the Hall elements 238x and 238y, the accuracy of the clearance d between the detection surfaces 238s of the Hall elements 238x and 238y and the position detection magnets 2314 and 2315 shown in FIG. 5 is extremely important. If the clearance d is unstable, the position detection accuracy of the first lens holding frame 231 by the Hall elements 238x and 238y is lowered.

However, in the camera 1 of this example, not only the flexible printed wiring board 237 is adhered to the fixed frame 232 by the double-sided tape 239, but also the presser plate 236 that is a leaf spring is provided in the gap between the fixed frame 232 and the aperture frame 233. And the back surfaces of the Hall elements 238x and 238y are pressed by the first leg 2362 and the second leg 2363. Therefore, even if the adhesive force of the double-sided tape 239 is reduced, the clearance d between the detection surfaces of the Hall elements 238x and 238y and the position detection magnets 2314 and 2315 can be maintained constant, and thereby the Hall elements 238x and 238y. The position detection accuracy of the first lens holding frame 231 can be maintained.

6 is a front view of a shake correction unit 23 according to another embodiment as viewed from the subject side, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 6 is a view corresponding to FIG. 4 of the above-described embodiment, and a part of the diaphragm frame 233 is shown in a cutaway manner for explaining the arrangement of the flexible printed wiring board 237.

  In the embodiment described above, the presser plate 236 is fixed to the protruding portion 2331 of the diaphragm frame 233, but in this embodiment, the presser plate 236 is fixed to the fixed frame 232. Therefore, as shown in FIG. 7, a pair of protrusions 2325 is formed on the fixed frame 232, and the protrusions 2325 are inserted into the holes 2364 and the long holes 2365 of the holding plate 236, and are fixed by heat caulking or the like.

  Compared to the case where the presser plate 236 is fixed to the diaphragm frame 233, when the presser plate 236 is fixed to the fixed frame 232, (1) the pair of protrusions 2325 are offset from the first recessed portion 2321 for mounting the flexible printed wiring board 237. (2) Along with this, the shape of the presser plate 236 shown in FIG. 3 needs to be slightly modified, and (3) the flange portion 2326 that receives the connecting surface 2361 of the presser plate 236 It should be noted that the protrusion 2325 needs to be formed, but other configurations can be set in the same manner as in the above-described embodiment, and the same effects as in the above-described embodiment can be achieved. It will be.

  In particular, when the presser plate 236 is fixed to the fixed frame 232, it is not necessary to consider the variation in the positional relationship between the fixed frame 232 and the stop frame 233, compared to the case where the presser plate 236 is fixed to the aperture frame 233. There is an advantage that the positional accuracy between the plate 236 and the Hall elements 238x and 238y becomes higher.

  This embodiment can also be applied to optical devices other than the camera 1 described above. In addition to the above-described device for pressing the hall elements 238x and 238y with the presser plate 236, for example, a gyro sensor for detecting a hand shake state or a device for pressing the MR sensor of the encoder provided in the distance ring of the lens barrel with the presser plate. It can also be applied to.

It is a figure which shows the camera which concerns on embodiment of this invention. It is a disassembled perspective view which shows the blurring correction unit which concerns on embodiment of this invention. It is the top view and sectional drawing which show the press plate which concerns on embodiment of this invention. It is a partially broken front view which shows the shake correction unit which concerns on embodiment of this invention. It is sectional drawing which follows the VV line of FIG. It is a partially broken front view which shows the blurring correction unit which concerns on other embodiment of this invention. It is sectional drawing which follows the VII-VII line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Camera 23 ... Shake correction unit 231 ... 1st lens holding frame 232 ... Fixed frame 233 ... Diaphragm frame 236 ... Holding plate 2361 ... Connection surface 2362 ... 1st leg part 2363 ... 2nd leg part 237 ... Flexible printed wiring board 238x , 238y ... Hall element 238s ... Detection surface

Claims (9)

A fixed frame provided with a first position detecting element and a second position detecting element;
A connecting portion; a first leg portion extending from the connecting portion toward the first position detecting element; and energizing the first position detecting element; and the second position detecting portion from the connecting portion. look including a second leg portion which is formed to extend in the direction of the element urging the second position detecting element, comprising: a biasing member made of a single plate spring, a
The fixed frame has a pair of protrusions,
The connecting portion is formed side by side in the longitudinal direction of the connecting portion, and has a pair of holes into which the protrusions are inserted.
One of the pair of holes is a long hole,
The position detection device , wherein the projections are inserted into the holes, and the connecting portion is fixed to the fixed frame by thermal caulking . A fixed frame provided with a first position detecting element and a second position detecting element;
A connecting portion; a first leg portion extending from the connecting portion toward the first position detecting element; and energizing the first position detecting element; and the second position detecting portion from the connecting portion. A biasing member configured to extend in the direction of the element and including a second leg portion that biases the second position detection element, and is configured by a single leaf spring;
An opposing member provided facing the fixed frame,
The opposing member has a pair of protrusions,
The connecting portion is formed side by side in the longitudinal direction of the connecting portion, and has a pair of holes into which the protrusions are inserted.
One of the pair of holes is a long hole,
The position detecting device, wherein the projections are inserted into the holes, and the connecting portion is fixed to the facing member by thermal caulking.   In the position detection device according to claim 1 or 2,
  The tips of the first leg and the second leg each have a folded portion,
  Holding down the first position detecting element at the folded portion of the first leg,
  The position detecting device, wherein the second position detecting element is pressed by the folded portion of the second leg. In the position detection device according to any one of claims 1 to 3,
The position detection element has a detection surface for performing position detection,
The position detecting device, wherein the biasing member biases a surface of the position detecting element opposite to the detection surface. The position detection device according to claim 4,
The position detection device, wherein the detection surface faces the fixed frame. In the position detection apparatus as described in any one of Claims 1-5 ,
The position detecting device according to claim 1, wherein the first leg and the second leg of the urging member are symmetrical. In the position detection apparatus as described in any one of Claims 1-6 ,
A position detection apparatus, wherein a flexible printed wiring board connected to the position detection element is provided between the biasing member and the position detection element. A position detecting device according to any one of claims 1 to 7 blur correction apparatus characterized by having a blur correcting unit that corrects an image blur by using a signal output from the position detecting device. An optical apparatus comprising the shake correction apparatus according to claim 8 .

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