JP5637754B2 - Lens holding device - Google Patents

Description

  The present invention relates to a lens holding device suitably used for a camera module of a mobile phone, for example.

  In a lens holding device suitably used for a camera module of a cellular phone, a lens carrier is sandwiched between a pair of ring-shaped spring plates arranged in the optical axis direction so that a focusing operation or the like can be performed. Proposed.

  In such a lens holding device, in order to prevent the lens optical axis from being assembled in a tilted state, the lens support connected to the spring plate and the lens barrel are configured as separate members, A technique for adhering a lens barrel and a lens support after adjusting the tilt of the lens barrel has been proposed (see Reference 1, etc.).

JP 2010-8446 A

  However, in the lens holding device according to the prior art, since the lens barrel is connected to the spring plate after adjusting the tilt of the lens barrel, the spring is deformed even if the lens barrel is not tilted at the assembly position. If this is done, the lens barrel may tilt, which is a problem.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a lens holding device capable of highly accurate tilt adjustment in consideration of a bias of a deformation load of a spring at the time of assembly and can be assembled with high accuracy. Is to provide.

In order to achieve the above object, a lens holding device according to the present invention includes:
A lens carrier (50) for holding the lens;
A first holding member (20) having a first carrier support portion (22) positioned on the incident side from the center position in the optical axis direction of the lens;
A second holding member (69, 70) having a second carrier support portion (72) located on the emission side from the center position;
A first outer ring part (32) fixed to the first carrier support part, and a first inner ring part (34) arranged on the inner peripheral side from the first outer ring part and fixed to the lens carrier And a first spring (30) having a first arm portion (36) for connecting the first outer ring portion and the first inner ring portion so as to be relatively movable,
A second outer ring part (62) fixed to the second carrier support part, and a second inner ring part (64) arranged on the inner peripheral side from the second outer ring part and fixed to the lens carrier A second spring (60) having a second arm part (66) for connecting the second outer ring part and the second inner ring part to be relatively movable,
A fixing part (86) for fixing the first holding member and the second holding member is provided at a position different from the first carrier supporting part and the second carrier supporting part.

  In the lens holding device according to the present invention, the first holding member to which the first spring is fixed is separated from the second holding member to which the second spring is fixed, and the first holding member and the second holding member are fixed. The fixing portion to be arranged is arranged at a position different from the fixing positions of the first and second springs. Accordingly, the lens holding member according to the present invention connects the lens carrier to the first and second holding members via the first and second springs before fixing the first holding member and the second holding member. be able to. Therefore, the lens holding member according to the present invention shifts the relative positions of the first holding member and the second holding member after the lens carrier is connected to the first and second holding members via the first and second springs. Thus, it is possible to adjust the tilt of the lens held by the lens carrier. In addition, the lens holding device according to the present invention can be adjusted with high accuracy in consideration of the bias of the deformation load of the spring at the time of assembly, and can be assembled with high accuracy.

In addition, for example, the first holding member may have a first pillar portion that is disposed on the outer peripheral side from the first outer ring portion and protrudes in the optical axis direction,
The second holding member may have a second pillar portion that is disposed on the outer peripheral side from the second outer ring portion and protrudes in the optical axis direction,
The fixing part may fix the first pillar part and the second pillar part.

In addition, for example, the first holding member may have a first pillar portion that is disposed on the outer peripheral side from the first outer ring portion and protrudes in the optical axis direction,
The second holding member may have a yoke disposed on the inner peripheral side of the first pillar portion so as to face the first pillar portion,
The fixing portion may fix the first pillar portion and the yoke.

  Such a lens holding device can be easily assembled since the fixing portion can be easily formed after adjusting the inclination.

  Further, for example, the fixing portion may be configured by an adhesive hardened layer that is located between the first column portion and the yoke and connects the first column portion and the yoke.

  Such a lens holding device is suitable for downsizing because a fixing portion can be formed by injecting an adhesive into a gap for position adjustment provided between the first column portion and the yoke. At the same time, it is easy to assemble.

Further, for example, the first carrier support part may have an orthogonal surface (22a) substantially orthogonal to the optical axis,
The first outer ring portion may be fixed to the orthogonal plane.

  Such a lens holding device can simplify the shapes of the first holding member and the first spring, and is easy to manufacture.

For example, the first holding member may have a yoke,
The second holding member may have a second pillar portion that is disposed on the outer peripheral side from the second outer ring portion and protrudes in the optical axis direction,
The fixing portion may fix the second pillar portion and the yoke.

  The yoke may have either the first holding member or the second holding member. Even when the first holding member has the yoke, the same as when the second holding member has the yoke. In addition, it can be assembled with high accuracy.

FIG. 1 is a perspective view of a lens holding device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the lens holding device shown in FIG. FIG. 3 is a cross-sectional view schematically showing the structure of the lens holding device shown in FIG. FIG. 4 is a conceptual diagram illustrating an example of an assembly process of the lens holding device shown in FIG.

First Embodiment FIG. 1 is a perspective view of a lens holding unit 10 according to an embodiment of the present invention. The lens holding unit 10 has a substantially rectangular parallelepiped outer shape. A lens carrier 50 that holds a lens (not shown) is disposed at the center of the lens holding unit 10. On the outer peripheral side of the lens carrier 50, a cap 20 and a bottom 70 surround the lens carrier 50. Has been placed.

  The lens holding unit 10 holds the lens carrier 50 holding the lens so as to be movable relative to the cap 20 and the bottom 70. Further, as will be described later, a voice coil motor is built in the lens holding unit 10, and the lens holding unit 10 can move the lens carrier 50 in the optical axis direction by the voice coil motor. . The lens holding unit 10 is used as a camera module or the like having a focus mechanism in combination with an imaging device arranged on the emission side, but the application of the lens holding unit 10 is not limited to this.

  FIG. 2 is an exploded perspective view of the lens holding unit 10 shown in FIG. The lens holding unit 10 includes a cap 20, an F spring 30, a yoke 40, a magnet 44, a coil 48, a lens carrier 50, a B spring 60, a bottom 70, and the like. The lens holding unit 10 includes a cover 12, an insulating sheet 46, and terminals 80a and 80b. In the description of the lens holding unit 10, the side on which the photographing light enters the lens along the optical axis α of the lens is referred to as the incident side, and the side from which the incident photographing light is emitted is referred to as the emission side.

  The cover 12 is a member for covering the outer periphery of the lens holding unit 10 and houses other members constituting the lens holding unit 10 therein. In FIG. 1, the cover 12 is not shown.

  The cap 20 supports the lens carrier 50 from the incident side via the F spring 30. The cap 20 includes a first frame portion 22 having a substantially rectangular frame shape, and a first pillar portion 24 that protrudes from the four corners of the first frame portion 22 toward the emission side in the optical axis α direction. The first frame portion end surface 22a, which is the end surface on the emission side of the first frame portion 22, is substantially orthogonal to the optical axis α, and the first outer ring portion 32 of the F spring 30 is formed on the first frame end surface 22a. It is fixed with an adhesive or the like.

  As shown in FIG. 3, the cap 20 is fixed to a base portion 69 including the yoke 40 and the bottom 70 by a fixing portion 86. The fixing portion 86 will be described in detail later.

  The F spring 30 shown in FIG. 2 supports the lens carrier 50 together with the B spring 60 so as to be movable in the direction of the optical axis α with respect to a support constituted by the cap 20, the yoke 40, the bottom 70 and the like. The F spring 30 has a multiple ring shape including a first outer ring portion 32, a first inner ring portion 34, and a first arm portion 36.

  The first outer ring portion 33 constituting the outer peripheral portion of the F spring 30 is fixed to the first frame portion end surface 22 a of the first frame portion 22 of the cap 20. The first inner ring portion 34 of the F spring 30 is disposed on the inner peripheral side from the first outer ring portion 32 and is fixed to the first inner ring installation portion 54 of the lens carrier 50 with an adhesive or the like. The first outer ring portion 32 and the first inner ring portion 34 are connected by a first arm portion 36.

  The F spring 30 is made of an elastic material such as metal, and the first arm portion 36 can be elastically deformed. When the first arm portion 36 is elastically deformed, the first inner ring portion 34 can move relative to the first outer ring portion 32 in the direction of the optical axis α.

  The yoke 40 is a member that guides the magnetic flux of the magnet 44 to the coil 48 and is made of a soft magnetic material such as iron. In the lens holding unit 10 according to the present embodiment, the yoke 40 is fixed to the bottom 70 and, together with the bottom 70, is a part of a base portion that supports the lens carrier 50 from the emission side. However, the yoke 40 may be fixed to the cap 20 and may be a part of a member that supports the lens carrier 50 from the incident side. In addition, the yoke 40 in the present embodiment is composed of one ring-shaped member, but may be divided into a plurality of members like a magnet 44.

  The magnets 44 are arranged at the four corners of the lens holding unit 10 while being fixed to the yoke 44, and face the coils 48 attached to the lens carrier 50 in the assembled state. The magnet 44 forms a voice coil motor for driving the lens carrier 50 together with the yoke 40 and the coil 48.

  The insulating sheet 46 is disposed between the yoke 40 and the B spring 60 and insulates the yoke 40 from the B spring 60.

  The coil 48 is fixed to a coil installation portion 52 formed on the outer peripheral portion of the lens carrier 50. Further, one end of the winding constituting the coil 48 is electrically connected to the second inner ring 64 of the B spring R60a, and the other end is the second inner ring of the B spring L60b. 64 is electrically connected. Therefore, electric power for driving the lens carrier 50 is supplied to the coil 48 via the B spring R60a, the B spring L60b, and the terminal 80a and the terminal 80b connected thereto.

  The lens carrier 50 has a hollow bottomless cylindrical shape, and a lens (not shown) is fixed to the inner peripheral surface of the lens carrier 50. A first inner ring installation portion 54 is formed on an end surface on the incident side of the lens carrier 50, and the first inner ring portion 34 of the F spring 30 is fixed to the first inner ring installation portion 54. On the other hand, a second inner ring installation portion 56 is formed on the exit side end face of the lens carrier 50, and the second inner ring portion 64 of the B spring 60 is fixed. The lens carrier 50 is supported by the F spring 30 and the B spring 60 so as to be movable in the direction of the optical axis α with respect to a support formed by the cap 20, the yoke 40, the bottom 70, and the like.

  The B spring 60 includes a B spring R60a and a B spring L60b, which are two members separated from each other, and also serves as a part of wiring for supplying power to the coil 48. The B spring 60 has a structure similar to that of the F spring 30 except that the B spring 60 is divided into two parts. Like the F spring 30, the B spring 60 has a second outer ring part 62 and a second inner ring part 64. And the second arm portion 66.

  The second outer ring portion 62 constituting the outer peripheral portion of the B spring 60 is fixed to the second frame end surface 72 a of the second frame portion 72 of the bottom 70. The second inner ring portion 64 of the B spring 60 is disposed on the inner peripheral side from the second outer ring portion 62 and is fixed to the second inner ring setting portion 56 of the lens carrier 50 with an adhesive or the like. The second outer ring part 62 and the second inner ring part 64 are connected by a second arm part 66.

  Similarly to the F spring 30, the B spring 60 is also made of an elastic material such as metal, and the second arm portion 66 can be elastically deformed. When the second arm portion 66 is elastically deformed, the second inner ring portion 64 can move relative to the second outer ring portion 62 in the optical axis α direction.

  The bottom 70, together with the yoke 40 and the like, constitutes a base member that supports the lens carrier 50 from the emission side via a B spring 60. The bottom 70 includes a rectangular flat plate-like second frame portion 72 having a circular through hole formed in the center, and a second column portion projecting from the four corners of the second frame portion 72 toward the incident side in the optical axis α direction. 74. The second frame portion end surface 72a, which is the end surface on the incident side of the second frame portion 72, is substantially orthogonal to the optical axis α, and the second outer ring portion 62 of the B spring 60 is formed on the second frame portion end surface 72a. It is fixed with an adhesive or the like.

  FIG. 3 is a cross-sectional view schematically showing the structure of the lens holding unit 10 shown in FIG. The lens carrier 50 that holds the lens 90 is held by the F spring 30 and the B spring 60 so as to be relatively movable in the direction of the optical axis α while preventing the optical axis α of the lens 90 from being inclined.

  The first frame portion 22 of the cap 20 is located on the incident side from the center position C in the optical axis α direction of the lens 90, and supports the lens carrier 50 from the incident side via the F spring 30. The second frame portion 72 of the bottom 70 is located on the exit side from the center position C in the optical axis α direction of the lens 90, and supports the lens carrier 50 from the exit side via the B spring 60.

  The first pillar portion 24 of the cap 20 and the second pillar portion 74 of the bottom 70 are arranged at the four corners of the lens holding unit 10, and F is arranged on the inner peripheral side of the first pillar portion 24 and the second pillar portion 74. A first outer ring portion 32 of the spring 30 and a second outer ring portion 62 of the B spring 60 are disposed. The first column portion end surface 24 a of the cap 20 is disposed so as to face the second column portion end surface 74 a of the bottom 70. The first column portion end surface 24a and the second column portion end surface 74a may be in contact with each other, and a part of the fixed portion 86 may be disposed between each other. A yoke 40 is disposed on the inner peripheral side of the first column part 24 so as to face the first column part 24.

  The cap 20 is fixed by a fixing portion 86 to a base portion 69 constituted by the bottom 70, the yoke 40, and the like. The fixing portion 86 determines the relative position between the cap 20 and the base portion 69, and then injects an adhesive into the gap 84 formed between the first column portion 24 and the outer peripheral surface 40a of the yoke 40, and cures it. It is formed by letting. The adhesive cured layer constituting the fixing portion 86 is in contact with the first column portion 24, the yoke 40, and the second column portion 74, and these are non-movably connected. The gap 84 also serves as an adjustment margin when adjusting the relative position of the cap 20 and the base portion 69.

  In the present embodiment, the fixing portion 86 is constituted by an adhesive cured layer formed by curing the adhesive, but the fixing portion 86 is not limited to this. For example, the fixing portion 86 may be formed by a welded portion in which one or both of the first pillar portion 24 and the second pillar portion 74 are solidified after being melted, and may be a screw or other connecting the cap 20 and the base. You may be comprised by the connection member.

  FIG. 4 is a conceptual diagram illustrating an example of an assembly process of the lens holding unit 10 shown in FIG. In assembling the lens holding unit 10, first, a semi-finished product 100 shown in FIG. 4A is prepared. The semi-finished product 100 is the same as the lens holding unit 10 shown in FIG. 3 except that the fixing portion 86 is not formed and the cap 20 is not fixed to the base portion 69.

  The semi-finished product 100 includes a step of preparing each member illustrated in FIG. 2, a step of fixing the yoke 40 and the magnet 44 to the bottom 70 and manufacturing a base portion 69 (see FIG. 3), and a first inner ring portion of the F spring 30. 34, fixing the second inner ring portion 64 of the B spring 60 to the lens carrier 50, and fixing the first outer ring portion 32 of the F spring 30 to the first frame portion 22 of the cap 20. And the step of fixing the second outer ring portion 62 of the B spring 60 to the second frame portion 72 of the bottom 70, and the like.

  Next, as shown in FIGS. 4B and 4C, the semi-finished product 100 is fixed to the adjustment jig 98 and preparations for adjusting the position of the cap 20 and the base portion 69 are made. The adjustment jig 98 has a bottom part 94 for fixing the base portion 69 and a moving hand 92 for changing and holding the position of the cap 20. In addition, a dummy lens 88 having a reflecting surface perpendicular to the optical axis α is mounted on the lens carrier 50, and an auto for measuring the angle of the reflecting surface of the dummy lens 88 so as to face the dummy lens 88. A collimator 96 is arranged.

  Next, as indicated by an arrow 91 in FIG. 4B, the cap 20 is moved relative to the base portion 69 in a direction perpendicular to the optical axis α, so that the relative position between the base portion 69 and the cap 20 is reached. Is adjusted to a predetermined value. The initial value of the relative position between the base portion 69 and the cap 20 is not particularly limited. For example, when no current is applied to the coil 48 (see FIG. 2) of the semi-finished product 100, the angle of the reflecting surface of the dummy lens 88 is 0 deg. (The reflection surface of the dummy lens 88 can be a value that becomes a reference surface of the lens holding unit 10 (for example, parallel to the emission-side end surface 70a of the bottom 70).

  Next, an electric current is applied to the coil 48 of the semi-finished product 100, and the angle of the reflecting surface of the dummy lens 88 is changed while moving the lens carrier 50 in the direction of the optical axis α as indicated by an arrow 93 in FIG. , And measured by an autocollimator 96. Thereby, the amount of inclination of the optical axis α when the relative position of the base portion 69 and the cap 20 is a predetermined value is detected. Such a tilt amount is, for example, the maximum value when the angle of the reflecting surface of the dummy lens 88 is continuously measured while moving the lens carrier 50 in the optical axis α direction, or when the lens carrier 50 is moved to the maximum stroke. The angle of the reflecting surface of the dummy lens 88 in FIG.

  Next, after changing the relative position of the base portion 69 and the cap 20 again as indicated by the arrow 91 in FIG. 4B, the lens carrier 50 is moved to the light as indicated by the arrow 93 in FIG. The operation of detecting the tilt amount of the optical axis α is repeated while moving in the direction of the axis α.

  Finally, after adjusting the relative position of the base portion 69 and the cap 20 in a state where the inclination amount of the optical axis α is the minimum value, as shown in FIG. 4C, the first column portion 24 of the cap 20. An adhesive 86 a is injected into the gap 84 between the yoke 40 and the yoke 40. By hardening the adhesive 86a, a fixing portion 86 for fixing the cap 20 and the base portion 69 is formed, and the lens holding unit 10 as shown in FIG. 3 is completed.

  As described above, the lens holding unit 10 according to the present embodiment includes a cap 20 to which the F spring 30 is fixed and a base portion 69 to which the B spring 60 is fixed as shown in FIG. It is said. Furthermore, the fixing portion 86 that fixes the cap 20 and the base portion 69 is disposed at a different position from the first frame portion 22 that fixes the F spring 30 and the second frame portion 72 that fixes the B spring 60. .

  Thereby, the lens holding unit 10 can be assembled through the semi-finished product 100 as shown in FIG. Here, in the semi-finished product 100, the cap 20 and the base portion 69 are not fixed, but the lens carrier 50 is connected to the cap 20 and the base portion 69 via the F spring 30 and the B spring 60. Therefore, the lens holding unit 10 can adjust the tilt of the lens 90 held by the lens carrier 50 by shifting the relative position of the cap 20 and the base portion 69 in the state of the semi-finished product 100. In addition, the lens holding unit 10 can be tilted with high accuracy in consideration of the deformation load bias of the springs 30 and 60 during assembly, and can be assembled with high accuracy.

  Further, the fixing portion 86 of the lens holding unit 10 injects an adhesive into the gap 84 provided between the first column portion 24 and the yoke 40 in order to adjust the position of the cap 20 and the base portion 69. Therefore, assembling is easy. In addition, since the fixed portion 86 of the lens holding unit 10 is disposed between the first frame portion 22 and the second frame portion 72 when viewed in the optical axis α direction, the lens holding unit 10 is large in the optical axis α direction. Can be prevented from expanding.

Other Embodiments The lens holding unit 10 as described above is an optical device having a focus mechanism and a shake correction mechanism by combining the entire lens holding unit 10 with a voice coil motor that moves in a direction perpendicular to the optical axis α. , May be used. The yoke 40 of the lens holding unit 10 may be a part of a member that supports the lens carrier 50 from the incident side by being fixed to the cap 20. In this case, the gap 84 for adjusting the position of the member that supports the lens carrier 50 from the incident side and the bottom 70 that supports the lens carrier 50 from the emission side can be provided between the yoke 40 and the second column portion.

DESCRIPTION OF SYMBOLS 10 ... Lens holding unit 20 ... Cap 22 ... 1st frame part 22a ... 1st frame part end surface 24 ... 1st pillar part 30 ... F spring 32 ... 1st outer ring part 34 ... 1st inner ring part 36 ... 1st arm Part 40 ... Yoke 44 ... Magnet 48 ... Coil 50 ... Lens carrier 52 ... Coil installation part 54, 56 ... Inner ring installation part 60 ... B spring 62 ... Second outer ring part 64 ... Second inner ring part 66 ... Second arm Part 69 ... Base part 70 ... Bottom 72 ... Second frame part 72a ... Second frame part end face 74 ... Second column part 84 ... Gap 86 ... Fixed part 88 ... Dummy lens 90 ... Lens 96 ... Autocollimator 100 ... Semi-finished product

Claims (7)

A lens carrier for holding the lens;
A first holding member having a first carrier support portion located on the incident side from the center position in the optical axis direction of the lens;
A second holding member having a second carrier support portion located on the emission side from the center position;
A first outer ring portion fixed to the first carrier support portion; a first inner ring portion disposed on an inner peripheral side of the first outer ring portion and fixed to the lens carrier; and the first outer ring portion. A first spring having a first arm portion that connects the ring portion and the first inner ring portion so as to be relatively movable; and
A second outer ring portion fixed to the second carrier support portion; a second inner ring portion disposed on an inner peripheral side of the second outer ring portion and fixed to the lens carrier; and the second outer ring portion. A second spring having a second arm portion that connects the ring portion and the second inner ring portion in a relatively movable manner;
A fixing portion that is in a position different from the first carrier support portion and the second carrier support portion and fixes the first holding member and the second holding member;
The first holding member has a first pillar portion that is disposed on the outer peripheral side from the first outer ring portion and protrudes from the four corners of the first carrier support portion in the optical axis direction,
The second holding member has a second pillar portion that is disposed on the outer peripheral side from the second outer ring portion and protrudes in the optical axis direction from four corners of the second carrier support portion,
The fixing portion is a gap as a white adjustment at the time of pre-SL with the said first holding member and the second holding member are relatively moved in the direction perpendicular to the optical axis of the lens to adjust the mutual relative position, the first A lens holding device that is provided on an inner peripheral side of a column portion or the second column portion and fixes the first column portion and the second column portion. The second holding member has a yoke disposed on the inner peripheral side of the first pillar portion so as to face the first pillar portion,
The lens holding device according to claim 1, wherein the gap is formed between the first column portion and the yoke. The second holding member has a yoke disposed on the inner peripheral side of the first pillar portion so as to face the first pillar portion,
The lens holding device according to claim 1, wherein the fixing portion fixes the first pillar portion and the yoke.   4. The lens according to claim 3, wherein the fixing part is configured by an adhesive hardened layer that is located between the first pillar part and the yoke and connects the first pillar part and the yoke. 5. Holding device. The first carrier support part has an orthogonal surface substantially orthogonal to the optical axis,
The lens holding device according to any one of claims 1 to 4, wherein the first outer ring portion is fixed to the orthogonal surface. The first holding member has a yoke;
The lens holding device according to claim 1, wherein the fixing portion fixes the second pillar portion and the yoke. A lens carrier for holding the lens;
A first holding member having a first carrier support portion located on the incident side from the center position in the optical axis direction of the lens;
A second holding member having a second carrier support portion located on the emission side from the center position;
A first outer ring portion fixed to the first carrier support portion; a first inner ring portion disposed on an inner peripheral side of the first outer ring portion and fixed to the lens carrier; and the first outer ring portion. A first spring having a first arm portion that connects the ring portion and the first inner ring portion so as to be relatively movable; and
A second outer ring portion fixed to the second carrier support portion; a second inner ring portion disposed on an inner peripheral side of the second outer ring portion and fixed to the lens carrier; and the second outer ring portion. A second spring having a second arm part that connects the ring part and the second inner ring part in a relatively movable manner, and
The first holding member has a first pillar portion that is disposed on the outer peripheral side from the first outer ring portion and protrudes from the four corners of the first carrier support portion in the optical axis direction,
The second holding member has a second pillar portion that is disposed on the outer peripheral side from the second outer ring portion and protrudes in the optical axis direction from four corners of the second carrier support portion,
Prepare a semi-finished product in which a gap is provided as an adjustment margin when adjusting the position of the first holding member and the second holding member on the inner peripheral side of the first pillar part or the second pillar part. And a process of
And adjusting the mutual relative position of the previous SL said first holding member and the second holding member are relatively moved in the direction perpendicular to the optical axis of the lens with the gap,
Forming a fixing part for fixing the first pillar part and the second pillar part. A method for manufacturing a lens holding device, comprising:

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