JP4695011B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device.

  As a lens driving device, for example, a device is disclosed in which an image of a subject is formed by driving the lens in the optical axis direction in order to form incident light on a light receiving surface of an image sensor. (For example, refer to Patent Document 1).

JP 2005-165058 A

  For example, as shown in FIG. 7, the lens driving device 100 has an AF lens 101 that focuses incident light on the light receiving surface of the image sensor 105 and an AF lens 101 and is movable in the direction of the optical axis 110. A lens holder 102 and a linear motor that drives the lens holder 102 are provided. The linear motor includes a magnet 104, a drive coil 103 that applies a driving force in the direction of the optical axis 110 to the lens holder 102 according to a driving current, and holder springs 120a and 120b that bias the lens holder 102 in the direction of the optical axis 110. have.

  In recent years, in the lens driving device 100, there has been a case where the configuration of the AF lens 101 mounted on the lens holder 102 is changed. Therefore, a lens holder to which the AF lens is attached and a moving lens body that holds the lens holder. Are formed as separate members. For example, screw portions are formed on the outer peripheral surface of the lens holder and the inner peripheral surface of the movable lens body, and both of them are screwed together. Thus, by changing the lens holder on which the AF lens or the AF lens group is mounted, other components can be made common.

  However, in the lens driving device described above, after being assembled, the AF lens or lens group needs to be adjusted in the optical axis direction in order to form incident light on the light receiving surface of the image sensor. Specifically, adjustment is performed by rotating the lens holder in the circumferential direction with respect to the moving lens body to which the holder spring is attached. However, when adjusting the lens holder, for example, if the fit is tight, the moving lens body may rotate following the lens holder and the holder spring may be deformed or damaged.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a lens driving device that regulates movement in the circumferential direction of a moving lens body to which a lens holder is attached separately.

In order to achieve this object, the present invention provides a lens holder including a lens, a moving lens body that holds the lens holder, a drive mechanism that moves the moving lens body in the optical axis direction of the lens, and a spring member. A fixed body that supports the movable lens body so as to be movable in the optical axis direction of the lens, and a locking means that can lock the movable lens body to the fixed body, the movable lens body including the lens A holder and a sleeve for holding the lens holder therein, a thread portion is formed on the outer peripheral surface of the lens holder and the inner peripheral surface of the sleeve, and the thread portions are screwed together, and the locking means One is formed on the moving lens body side and the other is formed on the fixed body side.

ADVANTAGE OF THE INVENTION According to this invention, the movement to the circumferential direction of the moving lens body which attached the lens holder separately can be controlled. Furthermore, deformation or breakage of the spring member that supports the moving lens body can be prevented.

  Moreover, it is preferable that the said latching means consists of a convex 1st latching | locking part and a concave 2nd latching | locking part. Thereby, the said latching means is a simple structure, and can restrict | limit a moving lens body reliably.

  Furthermore, it is preferable that a plurality of the locking means are formed. Thereby, the moving lens body can be regulated regardless of the circumferential direction. Moreover, since the moving distance in the circumferential direction can be reduced, when the moving lens body rotates in the circumferential direction, the impact property at the time of collision between the first locking portion and the second locking portion is kept low. Can do.

In addition, it is preferable that the first locking portion and the second locking portion have loose fitting portions in a direction orthogonal to the optical axis direction of the moving lens body.
As a result, the loose fitting portion functions as a buffer, so that when the lens driving device is dropped, the impact is not directly transmitted to the moving lens body, and the moving lens body can be protected.

ADVANTAGE OF THE INVENTION According to this invention, the movement to the circumferential direction of the moving lens body which attached the lens holder separately can be controlled. Furthermore, deformation or breakage of the spring member that supports the moving lens body can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Configuration of lens driving device]
FIG. 1 is a cross-sectional view showing a configuration of a lens driving device 10 according to a first embodiment of the present invention. More specifically, FIG. 1A is a cross-sectional view when the lens driving device 10 is cut in the direction of the optical axis X of the lens, and FIG. 1B is a cross-sectional view of FIG. In the lens drive device 10 shown by a figure, it is plane sectional drawing when cut | disconnecting by the dashed-dotted line of AA '. In FIG. 1A, for convenience of explanation, the upper side is the front side close to the subject and the lower side is the rear side close to the camera body.

In FIG. 1, the lens driving device 10 mainly includes a cover holder 11 corresponding to a part of a fixed body and a sleeve 15 corresponding to a part of a moving lens body. A lens holder 12 having a substantially cylindrical shape with the optical axis X positioned at the center thereof is attached to the inside of the sleeve 15 (not shown in FIG. 1, see FIG. 3). 12a is provided (see FIG. 3). The lens 12a is generally configured by combining a plurality of lenses.
In the present embodiment, screw portions are formed on the outer peripheral surface of the sleeve 15 corresponding to a part of the moving lens body and the outer peripheral surface of the lens holder 12.
These screw portions are screwed together so that incident light is imaged by the lens 12a on the light receiving surface of the image pickup device 30 disposed on the rear side close to the camera body in FIG.

  The cover holder 11 and the holder receiver 19 can be fitted (see FIG. 3), and the cylindrical yoke 16 is fixed by these. A magnet 17 formed in a ring shape is fixed to the inner peripheral surface of the yoke 16. That is, the magnet 17 is fixed to the yoke 16 so as to protrude inward from the inner peripheral surface of the yoke 16 (see FIG. 3). And it is magnetized in the direction orthogonal to the direction of the optical axis X. The yoke 16 is made of a ferromagnetic material such as a steel plate.

  On the outer periphery of the sleeve 15, a first coil 14 formed in a ring shape is fixed to the front side, and a second coil 14 'formed in a ring shape is fixed to the rear side. That is, on the outer periphery of the sleeve 15, the first coil 14 is disposed on the front side of the magnet 17 so as to face the magnet 17, and the magnet 17 is arranged in the direction of the optical axis X in relation to the first coil 14. The second coil 14 'is arranged so as to be interposed. As a result, the rear end surface of the first coil 14 and the front end surface of the magnet 17 face each other, and the front end surface of the second coil 14 ′ and the rear end surface of the magnet 17 face each other. Note that the first coil 14 and the second coil 14 ′ fixed to the sleeve 15 can be moved relative to the yoke 16 in the direction of the optical axis X.

  The magnetic flux emitted from the N pole of the magnet 17 passes through, for example, the sleeve 15, the first coil 14, and the yoke 16 and returns to the magnet 17 again. The magnetic flux emitted from the N pole of the magnet 17 returns to the magnet 17 again after passing through the sleeve 15, the second coil 14 ′, and the yoke 16, for example. Accordingly, a magnetic circuit (magnetic path) is formed by the members such as the first coil 14, the second coil 14 ', the yoke 16, and the sleeve 15. In this case, it is preferable to use a magnetic material as the material of the sleeve 15. The sleeve 15 can be removed from the material constituting the magnetic circuit (magnetic path).

  The distance between the opposing surfaces of the first coil 14 and the second coil 14 'is larger than the thickness of the magnet 17 in the direction of the optical axis X, and between the magnet 17 and the first coil 14 (or the second coil 14'). A gap is generated in the direction of the optical axis X, and the sleeve 15 integrated with the first coil 14 and the second coil 14 ′ can move in the direction of the optical axis X within the range of the gap. it can. The yoke 16 is formed such that the length in the direction of the optical axis X is longer than the distance between the opposing surfaces of the first coil 14 and the second coil 14 '. Thereby, the leakage magnetic flux leaking from the magnetic path between the magnet 17 and the first coil 14 (or the second coil 14 ′) can be reduced, and the movement amount of the sleeve 15 and the first coil 14 (and the second coil 14) can be reduced. ') Can improve the linearity between the current flowing in.

  In the center of the front side of the cover holder 11, a circular incident window 18 is provided for taking reflected light from the subject into the lens 12a (see FIG. 3).

Here, as shown in FIG. 1A, the lens driving device 10 is provided with a leaf spring 13 and a leaf spring 13 ′ that are spring members that support the sleeve 15. Of these, the leaf spring 13 ′ will be described in detail with reference to FIG. In FIG. 1B, the leaf spring 13 ′ attached to the holder receiver 19 is engaged with a rotation preventing groove 19 a formed in the holder receiver 19. As a result, the leaf spring 13 'is prevented from rotating.

  The leaf spring 13 ′ is a metal spring through which an electric current flows, and the rear end of the sleeve 15 is placed on the innermost circumferential portion 13′a. Further, three terminals 13'b for energizing the second coil 14 'are formed in the circumferential portion 13'a (see FIG. 1B), and the second coil 14 is passed through the terminal 13'b. Can supply current.

  Although a detailed description is omitted here, a terminal for energizing the first coil 14 is also formed in the leaf spring 13 as in the case of the leaf spring 13 ', and a current is supplied to the first coil 14 through the terminal. Can flow. As a result, the leaf spring 13 and the leaf spring 13 ′ can be made to function as energization wiring for the first coil 14 and the second coil 14 ′, and the electrical circuit configuration (circuit wiring) of the lens driving device 10 can be facilitated. Thus, the entire lens driving device 10 can be reduced in size.

  In the present embodiment, the sleeve 15 is provided with the energization wiring 20 for the first coil 14 and the second coil 14 '(see FIG. 1A). Thereby, the current flowing through the first coil 14 and the current flowing through the second coil 14 'can be made equal, and current control becomes easy.

[About locking means]
FIG. 2 is a perspective view showing a locking means according to an embodiment of the present invention, (a) is a perspective view showing a fixed body having a convex first locking part as a locking means, (b) ) Is a partial sectional view showing a moving lens body having a concave second locking portion as a locking means, and (c) is a first locking portion and a second locking portion shown in (a) and (b). It is explanatory drawing which shows the relationship. In (b) and (c), a threaded portion 15a is formed on the inner peripheral surface of the sleeve 15, but is omitted. Further, in (c), the leaf spring 13 ′ disclosed in FIG. 1 and the like is omitted.

  In the lens driving device 10, a sleeve 15 as a moving lens body is formed with locking means 40 that can be locked (or locked) with a holder receiver 19 corresponding to a part of the fixed body. In the embodiment, the locking means 40 mainly includes a convex first locking portion 41 and a concave second locking portion 42.

As shown in FIG. 2A, the convex first locking portion 41 is directed from the edge of the circular hole portion 19A formed in the holder receiver 19 corresponding to a part of the fixed body in the inner circumferential direction. The overhanging portion 43 is formed. That is, the first locking portion 41 is formed on the overhanging portion 43 formed on the holder receiver 19 so as to protrude along the direction of the optical axis X toward the front side (see FIG. 1, upper side) close to the subject. ing. The first locking portion 41 has, in its convex shape, first and second contact portions 41a and 41b and an end surface 41c in the direction of the optical axis X on the end surface in the circumferential direction.
In the present embodiment, the first locking portion 41 has one location in the circumferential direction and a predetermined width in the circumferential direction in order to maintain the strength.

On the other hand, as shown in FIG. 2B, the sleeve 15 as the moving lens body is formed with a second locking portion 42 that locks to the first locking portion 41 at the lower end portion thereof.
In the present embodiment, the second locking portion 42 has a concave shape cut out on the peripheral surface of the sleeve 15 toward the front side (see FIG. 1, upper side) close to the subject. The place is formed.
The second locking portion 42 has a size that substantially covers the first locking portion 41 formed on the sleeve 15 in the concave shape, and the end surface formed in the circumferential direction on the inner side thereof is the third, It has the 4th contact parts 42a and 42b and the end surface 42c of the direction of the optical axis X. That is, the third and fourth contact portions 42a and 42b can contact the first and second contact portions 41a and 41b, respectively. Further, the end surface 41 c of the first locking portion 41 is opposed to the end surface 42 c of the second locking portion 42.

Further, in the present embodiment, a projecting portion 44 extending in the optical axis X direction is formed on the end surface side in the circumferential direction of the second locking portion 42, that is, on the third contact portion 42 a side. The end surface 44 a of the projecting portion 44 comes into contact with the surface of the holder receiver 19 and is in contact with the sleeve 15 in the optical axis X direction. For this reason, the third contact portion 42a of the second locking portion 42 is longer than the fourth contact portion 42b in the direction of the optical axis X.
Further, the second locking portion 42 is formed longer in the circumferential width than the width of the first locking portion 41.

As shown in FIG. 2C, the second locking portion 42 is configured such that the convex shape of the first locking portion 41 fits into the concave shape. At this time, the end surface 41c of the first locking portion 41 is opposed to the end surface 42c of the second locking portion 42, may be in contact with it, or a gap may be interposed therebetween.
In addition, when the end surface 41c of the 1st latching | locking part 41 and the end surface 42c of the 2nd latching | locking part 42 contact | abut, it functions as positioning in the optical axis direction of the sleeve 15 as a moving lens body.

  Further, the first and second contact portions 41a and 41b formed in the first locking portion 41 are opposed to the third and fourth contact portions 42a and 42b of the second locking portion 42, respectively. ing. In addition, the 1st contact part 41a and the 3rd contact part 42a may contact | abut, and the 2nd contact part 41b and the 4th contact part 42b contact | abut. Also good. That is, in the present embodiment, the width in the circumferential direction of the first locking portion 41 is longer than the width of the second locking portion 42, and the first locking portion 41 and the second locking portion 42 are formed. Is a loosely fitted state having a clearance in the circumferential direction.

  According to the lens driving device 10 having such a configuration, the convex first locking part 41 is fitted into the concave second locking part 42, and the first contact part 41a and the third contact part are fitted. 42a abuts, or the second abutment portion 41b and the fourth abutment portion 42b abut and can be locked. Thereby, the rotation of the sleeve 15 as the moving lens body can be restricted in a predetermined direction. Next, a method for assembling the lens driving device 10 will be described.

[Assembly method]
FIG. 3 is an exploded perspective view for explaining an assembling method of the lens driving device 10 according to the embodiment of the present invention. The first coil 14 and the second coil 14 ′ are fixed to the outer periphery of the sleeve 15 in advance, and the lens holder 12 is incorporated in the sleeve 15 in advance. In the present embodiment, the screw portion 12b formed on the outer peripheral surface of the lens holder 12 and the screw portion 15a formed on the inner peripheral surface of the sleeve 15 as the moving lens body are attached to a temporary position while being screwed together. .
The magnet 17 is fixed to the inner peripheral surface of the yoke 16 in advance. The magnet 17 and the yoke 16 have a crack in the direction of the optical axis X and can be divided into two.

  In FIG. 3, first, the leaf spring 13 ′ is attached to the lens holder receiver 19 so as to engage with the rotation prevention groove 19 a formed in the holder receiver 19. Next, the magnet 17 and the yoke 16 are divided into two parts, and the magnet 17 is interposed between the first coil 14 and the second coil 14 'fixed to the outer periphery of the sleeve 15, so that the magnet 17 and the yoke 16 is again integrated (fixed). Then, the yoke 16 in which the sleeve 15 is incorporated is fixed to the holder receiver 19. At this time, the second locking portion 42 formed on the sleeve 15 as the moving lens body is fitted to the first locking portion 41 formed on the holder receiver 19 corresponding to a part of the fixed body.

  The rear end of the sleeve 15 is placed on the innermost circumferential portion 13'a of the leaf spring 13 '. Finally, after the plate spring 13 is placed so that the innermost circumferential portion thereof is in contact with the front end of the sleeve 15, the cover holder 11 is engaged with the holder receiver 19.

Thus, in the assembled lens driving device 10, after being assembled at the temporary position, the lens 12 a needs to be adjusted in the optical axis X direction in order to form incident light on the light receiving surface of the image sensor 30. is there. Specifically, the lens holder 12 is adjusted by rotating in the circumferential direction with respect to the sleeve 15. At this time, the sleeve 15 tries to move in the circumferential direction by the rotation of the lens holder 12, but the first locking portion 41 formed on the sleeve 15 is connected to the second locking portion 42 formed on the holder receiver 19. Since the sleeve 15 is fitted, when the sleeve 15 tries to rotate in the direction of arrow A shown in FIG. 2C, the first contact portion 41 a of the first locking portion 41 is the second of the second locking portion 42. The sleeve 15 is engaged with the contact portion 42a.
When the sleeve 15 tries to rotate in the direction of arrow B shown in FIG. 2C, the second contact portion 41b of the first locking portion 41 becomes the fourth contact portion 42b of the second locking portion 42. It abuts and the sleeve 15 is locked.

  In this manner, the lens holder 12 is rotated in a state where the sleeve 15 is locked to the holder receiver 19, and the lens 12 a is adjusted in the direction of the optical axis X. After adjustment, the sleeve 15 and the lens holder 12 are fixed using an adhesive or the like so that the positions of the sleeve 15 and the lens holder 12 do not change.

  In this way, the lens driving device 10 shown in FIG. 1A can be assembled. The plate spring 13 and the plate spring 13 'are formed with tongues on the outside in the radial direction, and this serves as a power feeding portion to the coil.

[Operation]
FIG. 4 is an explanatory diagram of the operation of the lens driving device 10, and is an explanatory diagram for explaining how the sleeve 15 is stopped at a desired position. FIG. 4A shows the mechanical configuration when focusing on the right half of the optical axis X in FIG. Further, the magnet 17 is magnetized so that the radially inward is N-pole and the radially outward is S-pole.
The locking means 40 shown in FIG. 1 is omitted from FIGS. 4A to 4D for the sake of simplicity.

  In FIG. 4A, the magnetic flux emitted from the N pole of the magnet 17 passes in the order of the sleeve 15 → the first coil 14 → the yoke 16 (see the arrow in FIG. 4B). Of course, if leakage magnetic flux is taken into consideration, the magnetic flux emitted from the N pole of the magnet 17 may return only through the first coil 14. On the other hand, the magnetic flux emitted from the N pole of the magnet 17 passes in the order of the sleeve 15 → the second coil 14 ′ → the yoke 16 (see the arrow in FIG. 4B). Of course, if leakage flux is taken into consideration, the magnetic flux emitted from the N pole of the magnet 17 may return only through the second coil 14 '. Therefore, a magnetic circuit (magnetic path) is formed by members such as the first coil 14, the second coil 14 ′, the yoke 16, and the sleeve 15.

  In such a state, a current in the same direction is passed through the first coil 14 and the second coil 14 '. In the present embodiment, as shown in FIG. 4C, a current is passed from “back” to “front” of the page. Then, the energized first coil 14 and second coil 14 'placed in the magnetic field each receive the upward (front) electromagnetic force FH (see the arrow in FIG. 4C). As a result, the sleeve 15 to which the first coil 14 and the second coil 14 ′ are fixed starts to move forward. In the present embodiment, as described above, the energization wiring 20 is provided in the sleeve 15, and the current flowing through the first coil 14 and the current flowing through the second coil 14 'are equalized. The substantially equal electromagnetic force FH acts on the first coil 14 and the second coil 14 '. Further, since the size of the lens driving device 10 is very small (for example, outer diameter is about 10 mm × height is about 5 mm), the magnetic flux passing through the first coil 14 and the magnetic flux passing through the second coil 14 ′ are almost equal. Think of things.

  At this time, the force (elastic force FS1, elastic force FS2) that restricts the movement of the sleeve 15 is between the leaf spring 13 and the front end of the sleeve 15 and between the leaf spring 13 'and the rear end of the sleeve 15. Occurs (see arrow in FIG. 4D). For this reason, when the electromagnetic force FH + FH that attempts to move the sleeve 15 forward and the elastic force FS1 + FS2 that restricts the movement of the sleeve 15 are balanced, the sleeve 15 stops. In this way, by adjusting the amount of current flowing through the first coil 14 and the second coil 14 'and the elastic force acting on the sleeve 15 by the leaf spring 13 and the leaf spring 13', the sleeve 15 is brought to a desired position. Can be stopped.

  In the present embodiment, since the leaf spring 13 and the leaf spring 13 ′ in which a linear relationship is established between the elastic force (stress) and the displacement amount (strain amount) are used, Linearity between the currents flowing through the first coil 14 and the second coil 14 'can be improved. In addition, since two elastic members, the leaf spring 13 and the leaf spring 13 ', are used, a large balance force is applied in the direction of the optical axis X when the sleeve 15 is stopped. Even if other force such as centrifugal force acts in the direction, the sleeve 15 can be stopped more stably. Further, in the lens driving device 10, the sleeve 15 is not stopped by colliding with a collision material (buffer material) or the like, but is stopped using a balance between electromagnetic force and elastic force. Therefore, it is possible to prevent the occurrence of a collision sound.

  Further, in the lens driving device 10, the lens holder 12 is placed on the sleeve 15 so that incident light is imaged by the lens 12 a on the light receiving surface of the image sensor 30 disposed on the rear side close to the camera body in FIG. 1. For example, when the screwing is tight, the sleeve 15 may turn. However, according to the configuration described above, the second locking portion 42 formed on the sleeve 15 is The sleeve 15 is fitted to the first locking portion 41 formed on the receiver 19 and the rotation of the sleeve 15 is restricted. That is, when the sleeve 15 tries to rotate in the direction of arrow A shown in FIG. 2 (c), the first contact portion 41 a of the first locking portion 41 becomes the second contact portion 42 a of the second locking portion 42. It abuts and the sleeve 15 is locked. Further, when the sleeve 15 tries to rotate in the direction of arrow B shown in FIG. 2C, the second contact portion 41 b of the first locking portion 41 becomes the second contact portion 42 b of the second locking portion 42. It abuts and the sleeve 15 is locked. Therefore, the rotation of the sleeve 15 can be restricted, and as a result, the leaf spring 13 ′ and the leaf spring 13 can be prevented from being deformed or damaged.

[Modification]
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the gist of the present invention.
For example, the first locking portion having a convex shape and the second locking portion having a concave shape as the locking means are described, but the first locking portion having a concave shape and the second locking portion having a convex shape are used. You may comprise a latching means.

FIG. 5 is a cross-sectional view for explaining locking means according to another embodiment of the present invention. Moreover, FIG. 6 is a figure explaining the 2nd latching means which concerns on other embodiment of this invention.
For example, as shown in FIG. 5, a loose fitting portion (gap) G may be formed in the radial direction in the first locking portion 410 and the second locking portion 420 constituting the locking means 400. Thus, by forming the loose fitting part (gap) G in the radial direction, the loose fitting part (gap) G functions as a buffer. Therefore, when the lens driving device is dropped, the impact is not directly transmitted to the moving lens body, and the moving lens body can be protected.

  Further, in the above-described embodiment, the locking means 410A is formed at one place in the circumferential direction, but the present invention is not limited to this, and a plurality of locking means 410A may be formed at a predetermined interval in the circumferential direction. . For example, as shown in FIG. 6, in the sleeve 150, the second locking portions 420A and 420B are formed at intervals of 90 degrees in the circumferential direction. Protrusions 430A and 430B are formed in the vicinity of the second locking portions 420A and 420B. By forming a plurality in this way, the time for fitting the first locking portion 41 can be shortened.

  The lens driving device 10 as described above can be attached to various electronic devices in addition to the camera-equipped mobile phone. For example, PHS, PDA, bar code reader, thin digital camera, surveillance camera, vehicle rear view confirmation camera, door with optical authentication function, and the like.

  The lens driving device according to the present invention is useful as a device that can stop the moving lens body at a desired position, and thus improve the focus adjustment function.

It is sectional drawing which shows the machine structure of the lens drive device which concerns on embodiment of this invention. It is a perspective view which shows the latching means which concerns on embodiment of this invention, (a) is a perspective view which shows the fixed body which has the convex-shaped 1st latching | locking part 51 as a latching means, (b) is related. The fragmentary sectional view which shows the moving lens body which has the concave 1st latching | locking part as a stop means, (c) is the relationship between the 2nd latching | locking part shown in (a) and (b), and a 1st latching part. It is explanatory drawing which shows. It is a disassembled perspective view for demonstrating the assembly method of the lens drive device which concerns on embodiment of this invention. It is explanatory drawing for demonstrating a mode that a sleeve stops at a desired position in a lens drive device. It is sectional drawing explaining the latching means which concerns on other embodiment of this invention. It is a figure explaining the 2nd latching means which concerns on other embodiment of this invention. It is explanatory drawing which shows the conventional lens drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lens drive device 11 Cover holder 12 Lens holder 12a Lens 13, 13 'Leaf spring 14, 14' 1st coil, 2nd coil 15 Sleeve 16 Yoke 17 Magnet 18 Incident window 19 Holder receiver 40 Locking means 41 First lock Part 41a First contact part 41b Second contact part 42 Second locking part 42a Third contact part 42b Fourth contact part G Free fitting part (gap)

Claims (4)

A lens holder provided with a lens, a moving lens body that holds the lens holder, a drive mechanism that moves the moving lens body in the optical axis direction of the lens, and the optical axis of the lens via a spring member A fixed body that is movably supported in a direction, and a locking means that allows the moving lens body to be locked to the fixed body,
The moving lens body includes the lens holder and a sleeve that holds the lens holder inside, and a thread portion is formed on the outer peripheral surface of the lens holder and the inner peripheral surface of the sleeve, and the thread portions are screwed together. And
One of the locking means is formed on the movable lens body side, and the other is formed on the fixed body side.   The lens driving device according to claim 1, wherein the locking means includes a convex first locking portion and a concave second locking portion.   3. The lens driving device according to claim 1, wherein a plurality of the locking means are formed.   3. The lens driving device according to claim 2, wherein the first locking portion and the second locking portion have loose fitting portions in a direction orthogonal to the optical axis direction of the moving lens body.

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