JP4719107B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device that forms a subject image by driving a lens in the direction of an optical axis.

  In recent years, as camera-equipped mobile phones equipped with cameras have become popular, opportunities for photographing various subjects using the mobile phones have increased. For example, you can shoot a subject that is far away from the camera lens, such as a friend or landscape (normal shooting), or a subject that is close to the camera lens, such as a bus timetable or petals (close-up shooting) There is a case.

  In close-up photography (macro photography), the lens position of the camera needs to be closer to the subject side than the lens position during normal photography. For this reason, this type of photographic lens system includes a drive mechanism that drives the lens to move in the direction of the optical axis, so that the lens can be moved in the direction of the optical axis by driving the drive mechanism by switching a switch. (For example, refer to Patent Documents 1 and 2).

  The lens driving device disclosed in Patent Document 1 moves a lens support in the optical axis direction of a lens by electromagnetic force generated by energizing a coil. When the coil is not energized, the lens support is biased (pressed) to the base by the two springs. Thereby, when the camera is not used, the lens support is not easily shaken or rattled, and the impact resistance can be improved.

On the other hand, the lens driving device disclosed in Patent Document 2 moves the lens holder in the optical axis direction of the lens by electromagnetic force generated by energizing the coil. A contact portion and a holder spring for biasing the lens holder. The holder abutting portion regulates the movable range of the lens holder so as not to include the position where the holder spring becomes neutral. Thereby, the biasing force of the holder spring is always applied to the lens holder, and as a result, the impact resistance can be improved.
JP 2005-128392 A (paragraph number 0014) Japanese Patent Laying-Open No. 2005-165058 (paragraph number 0012)

  However, since the lens driving devices disclosed in Patent Document 1 and Patent Document 2 hold the lens unit (the lens support body or the lens holder described above) relying on the biasing force of the spring as described above, There is a problem that the accuracy becomes unstable.

  In other words, a spring manufactured by press working is generally distorted and burred, and variations in the spring constant result in unstable position accuracy. In this regard, if the spring is manufactured by etching, variations in the spring constant can be suppressed to some extent, but the productivity is poor, leading to an increase in manufacturing cost.

  The present invention has been made in view of the above points, and an object thereof is to provide a lens driving device capable of stabilizing the stationary position accuracy of a lens unit.

In order to solve the above problems, in the present invention, a moving lens body provided with a lens, a fixed body that supports the moving lens body so as to be movable in the lens optical axis direction, and the moving lens body in the lens optical axis direction. A driving mechanism for moving the lens, and the driving mechanism includes a coil held by the moving lens body, a magnet held by the fixed body, and a gap between the moving lens body and the fixed body. An elastic member that applies an elastic force to the moving lens body when the moving lens body is about to move from a stationary position to the subject side, and on the side where the subject is located from the magnet. A magnetic member held by the moving lens body, and supplying an electric current to the coil to generate an electromagnetic force that moves the moving lens body from the stationary position to the subject side. When the electromagnetic force and the elastic force are balanced and the moving lens body is stopped at the subject side position, and the current supply to the coil is stopped, the moving lens body is stopped by the elastic force of the elastic member. The moving lens body is held at the stationary position by a magnetic attraction force generated between the magnet and the magnetic member.

In the present invention, when the driving mechanism generates an electromagnetic force by supplying a current to the coil, a magnet held by the moving lens body, a magnet held by the fixed body, and the coil, the driving mechanism is based on the electromagnetic force. Since the elastic member that restricts the movement of the moving lens body and the magnetic member that is held by the moving lens body and is magnetically attracted to the magnet are provided, a magnetic force is generated between the magnetic member and the magnet. The suction force will work.

Therefore, at the time of macro photography, for example, the electromagnetic force by the coil and the elastic force by the elastic member are balanced, and the moving lens body can be stopped at an appropriate position, while at the time of normal photography (or when the camera is not used), for example. Can hold the moving lens body by a magnetic attractive force acting between the magnetic member and the magnet. In particular, unlike the above-described conventional lens driving device, the present invention does not hold the moving lens body by relying on the biasing force of the spring, but holds the moving lens body by relying on a highly stable magnetic attraction force. Is. Therefore, it is possible to stabilize the moving lens body by suppressing variations in accuracy of the stationary position . Further, since the magnetic member is disposed on the subject side relative to the magnet, the moving lens body is attracted to the side opposite to the side that moves during macro photography. For this reason, during normal shooting (or when the camera is not used), the moving lens body can be held by the magnetic attractive force that acts between the magnetic member and the magnet, and as a result, the stationary position accuracy of the moving lens body is stabilized. Can be made.

Here, as a means for generating a force in the direction opposite to the moving direction of the moving lens body, it is preferable that the force changes according to the moving amount of the moving lens body. For example, it may be an elastic member such as a leaf spring, a coil spring, a magnetic spring, or rubber, or an N pole (S pole) magnet is installed on the fixed body, and an N pole (S pole) is installed on the moving lens body. A magnet may be installed and the magnetic repulsive force of both may be used, and the type is not limited.

  In addition, the “magnetic member” in the present invention may be any member as long as a magnetic attraction force works with the magnet. For example, even a member that is generally known to have non-magnetic properties is included in the “magnetic member” if a magnetic attraction force acts on the magnet even a little. In addition, the shape, type, and size of the “magnetic member” do not matter.

  In this invention, it is preferable that the said magnetic member is arrange | positioned coaxially with the optical axis of a lens.

  According to the present invention, since the magnetic member described above is disposed coaxially with the optical axis of the lens, a magnetic attractive force can be stably generated between the magnetic member and the magnet.

In another embodiment of the present invention, a moving lens body provided with a lens, a fixed body that supports the moving lens body so as to be movable in the lens optical axis direction, and a drive mechanism that moves the moving lens body in the lens optical axis direction. The driving mechanism includes a coil held on the moving lens body, a magnet held on the fixed body, and the moving lens body on the side where the subject is located from the magnet. An elastic member attached between a fixed body and an elastic member that applies an elastic force against the movement to the moving lens body when the moving lens body is about to move from a stationary position to the subject side. The member is a magnetic member, and when the electromagnetic force for supplying the current to the coil to move the moving lens body from the stationary position to the subject side is generated, the electromagnetic force and the When the moving lens body is stopped at the subject side position in balance with the sexual force and the current supply to the coil is stopped, the moving lens body is moved toward the stationary position by the elastic force of the elastic member. The moving lens body is held at the stationary position by a magnetic attractive force generated between the magnet and the elastic member made of the magnetic member.

In the present invention, when the driving mechanism generates an electromagnetic force by supplying a current to the coil, a magnet held by the moving lens, a magnet held by the fixed body, and the coil, the driving mechanism is based on the electromagnetic force. to restrict the movement of the moving lens body, and so was the provision of the elastic member which is magnetically attracted to the magnet, so that the magnetic attraction force acts between the elastic member and the magnet.

  Therefore, for example, during normal photographing (or when the camera is not used), the moving lens body can be held by relying on a highly stable magnetic attractive force without depending on the biasing force of the spring. Variation of the stationary position accuracy of the movable lens body can be suppressed, and as a result, the stationary position accuracy of the moving lens body can be stabilized.

In the present invention, a first elastic member attached between the moving lens body and the fixed body on the side where the subject is located from the magnet, and the moving lens on the side opposite to the side where the subject is located from the magnet. A second elastic member attached between a body and the fixed body, and the first elastic member is the elastic member as the magnetic member among the first elastic member and the second elastic member. A configuration can be employed.

In the present invention, the one of the first elastic member and the second elastic member, since a structure comprising a member which is magnetically attracted to the magnet for the first elastic member, a magnetic between the first elastic member and the magnet The suction force will work. Therefore, the first elastic member or the second elastic member has a high stability during normal shooting (or when the camera is not used) by attracting the elastic member (for example, the first elastic member) on the subject side to the magnet. The moving lens body can be held by relying on the magnetic attractive force, and the stationary position accuracy of the moving lens body can be stabilized.

In this invention, the structure by which the said coil is arrange | positioned between the said magnet and the said magnetic member can be employ | adopted in the optical axis direction of the said lens.

  According to the lens driving device of the present invention, for example, during normal shooting (or when the camera is not used), the moving lens body is held by relying on a highly stable magnetic attraction force. Variations in position accuracy can be suppressed, and as a result, the stationary position accuracy of the moving lens body can be stabilized.

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

[Embodiment 1]
(Machine configuration)
FIG. 1 is a cross-sectional view showing a mechanical configuration of a lens driving device 10 according to an 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 top is the front side close to the subject.

  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. Inside the sleeve 15 is attached a substantially cylindrical lens barrel 12 (not shown in FIG. 1; see FIG. 2) in which the optical axis X is located at the center. A lens 12a is provided (see FIG. 2). The lens 12a is generally configured by combining a plurality of lenses.

  The cover holder 11 and the holder receiver 19 can be fitted (see FIG. 2), and the cylindrical yoke 16 is fixed by these, and the cover holder 11, the holder receiver 19 and the yoke 16 constitute a fixed body. . 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. 2). 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 141 formed in a ring shape is fixed to the front side, and a second coil 142 formed in a ring shape is fixed to the rear side. That is, on the outer periphery of the sleeve 15, the first coil 141 is disposed on the front side of the magnet 17 so as to face the magnet 17, and the magnet 17 is oriented in the direction of the optical axis X in relation to the first coil 141. The second coil 142 is arranged so that the intervenes. As a result, the rear end surface of the first coil 141 and the front end surface of the magnet 17 are opposed to each other, and the front end surface of the second coil 142 and the rear end surface of the magnet 17 are opposed to each other. The first coil 141 and the second coil 142 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 141, 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 142, and the yoke 16, for example. Therefore, a magnetic circuit (magnetic path) is formed by the members such as the first coil 141, the second coil 142, 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 distance between the opposing surfaces of the first coil 141 and the second coil 142 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 141 (or the second coil 142), A gap is generated in the direction of the optical axis X, and the sleeve 15 integrated with the first coil 141 and the second coil 142 can move in the direction of the optical axis X within the range of the gap. 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 141 and the second coil 142. Thereby, the leakage magnetic flux leaking from the magnetic path between the magnet 17 and the first coil 141 (or the second coil 142) can be reduced, and the movement amount of the sleeve 15 and the first coil 141 (and the second coil 142) can be reduced. It is possible to improve the linearity between the current flowing in the capacitor.

  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. 2). Further, the lens driving device 10 is provided with a leaf spring 131 (first elastic member) and a leaf spring 132 (second elastic member) that restrict the movement of the sleeve 15. Among these, the leaf | plate spring 132 is demonstrated in detail using FIG.1 (b). In FIG. 1B, the leaf spring 132 attached to the holder receiver 19 is engaged with an anti-rotation groove 19 a formed in the holder receiver 19. Thereby, the leaf spring 132 is prevented from rotating.

  The leaf spring 132 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 132a. Further, three terminals 132b for energizing the second coil 142 are formed in the circumferential portion 132a (see FIG. 1B), and current can be supplied to the second coil 142 through the terminal 132b. it can.

  Although a detailed description is omitted here, the leaf spring 131 is also provided with a terminal for energizing the first coil 141, similarly to the leaf spring 132, and a current is supplied to the first coil 141 through the terminal. It can flow. As a result, the leaf spring 131 and the leaf spring 132 can be made to function as energization wiring for the first coil 141 and the second coil 142, and the electrical circuit configuration (circuit wiring) of the lens driving device 10 can be facilitated. The drive device 10 as a whole can be downsized.

  Further, in the present embodiment, the energization wiring 20 for the first coil 141 and the second coil 142 is provided on the sleeve 15 (see FIG. 1A). Thereby, the current flowing through the first coil 141 and the current flowing through the second coil 142 can be made equal, and current control is facilitated.

  Here, in the lens driving device 10, as shown in FIG. 1A, an annular magnetic member 30 is disposed on the opposite side of the magnet 17 with the first coil 141 interposed therebetween. Further, the magnetic member 30 is arranged coaxially with the optical axis X. Therefore, a magnetic attraction force acts between the magnetic member 30 and the magnet 17 so that the sleeve 15 can be held. This holding operation will be described in detail later (holding operation). Next, a method for assembling the lens driving device 10 will be described.

(Production method)
FIG. 2 is an exploded perspective view for explaining an assembling method of the lens driving device 10 according to the embodiment of the present invention. A similar assembling method can also be adopted for a lens driving device 10A according to another embodiment of the present invention described later. The first coil 141 and the second coil 142 are fixed to the outer periphery of the sleeve 15 in advance, and the lens barrel 12 having the lens 12a is previously incorporated in the sleeve 15. 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. 2, first, the plate spring 132 is attached to the holder receiver 19 so as to engage with the rotation prevention groove 19 a formed in the holder receiver 19. Next, the annular magnetic member 30 is attached to the upper side (or the upper surface) of the first coil 141. At this time, the magnetic member 30 may be fixed to the upper end of the sleeve 15. Next, the magnet 17 and the yoke 16 are divided into two parts, and the magnet 17 is interposed between the first coil 141 and the second coil 142 fixed to the outer periphery of the sleeve 15, so that the magnet 17 and the yoke 16 are interposed. Are integrated (fixed) again. Then, the yoke 16 in which the sleeve 15 is incorporated is fixed to the holder receiver 19. At this time, the rear end of the sleeve 15 is placed on the innermost circumferential portion 132 a of the leaf spring 132. Finally, after the plate spring 131 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. In this way, the lens driving device 10 shown in FIG. 1A can be assembled. In addition, the leaf spring 131 and the leaf spring 132 are formed in a tongue shape outward in the radial direction, and this serves as a power feeding portion to the coil.

(Holding action)
FIG. 3 is an explanatory diagram for explaining how the sleeve 15 is held in the lens driving device 10. 3A and 3B show 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.

In FIG. 3A, the magnetic flux emitted from the N pole of the magnet 17 passes in the order of the sleeve 15 → the first coil 141 → the yoke 16. The magnetic flux emitted from the N pole of the magnet 17 passes through the sleeve 15 → the second coil 142 → the yoke 16 in this order. In such a state, in FIG. 3A, since the current in the same direction flows through the first coil 141 and the second coil 142 (for example, the current flows from “back” to “fore” on the page). Therefore, the energized first coil 141 and second coil 142 placed in a magnetic field each receive an upward (front) electromagnetic force F _H (see the arrow in FIG. 3A). Thereby, the sleeve 15 to which the first coil 141 and the second coil 142 are fixed has moved to the front side.

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 141 and the current flowing through the second coil 142 are equalized. 141 and the second coil 142 have substantially the same electromagnetic force F _H. Further, since the size of the lens driving device 10 is small (for example, outer diameter is about 10 mm × height is about 5 mm), the magnetic flux passing through the first coil 141 and the magnetic flux passing through the second coil 142 are substantially equal. Conceivable.

On the other hand, between the leaf spring 131 and the front end of the sleeve 15 and between the leaf spring 132 and the rear end of the sleeve 15, forces that restrict the movement of the sleeve 15 (elastic force F _S1 and elastic force F _S2 ), respectively. Has occurred (see the arrow in FIG. 3A). Therefore, in FIG. 3A, the electromagnetic force F _H + F _H that attempts to move the sleeve 15 forward and the elastic force F _S1 + F _S2 that restricts the movement of the sleeve 15 are balanced, and the sleeve 15 stops. is doing.

Next, when switching from macro photography to normal photography (camera not used), the lens driving device 10 shifts from the state shown in FIG. 3A to the state shown in FIG. More specifically, since the electromagnetic force F _H described above does not act on the first coil 141 and the second coil 142 when the first coil 141 and the second coil 142 are not energized, the leaf spring 131 and the leaf spring The sleeve 15 returns to the original position by the elastic forces F _S1 and F _{S2 of} 132.

At this time, the sleeve 15 is held by the magnetic attractive forces F _m1 and F _m2 acting between the magnetic member 30 and the magnet 17 via the first coil 141. Accordingly, it is possible to prevent the sleeve 15 from shaking and rattling, and to suppress variations in the stationary position accuracy of the moving lens bodies such as the lens 12a and the lens barrel 12 during normal photographing (when the camera is not used).

  In particular, according to the lens driving device 10 according to the present embodiment, since the magnetic member 30 is formed in an annular shape and is arranged coaxially with the optical axis X, it is between the magnetic member 30 and the magnet 17. The magnetic attractive force is not biased, and the magnetic attractive force can be stably generated at all positions in the circumferential direction of the first coil 141. Therefore, the stationary position accuracy of the moving lens body such as the lens 12a or the lens barrel 12 can be further stabilized. Note that the thickness of the magnetic member 30 in the optical axis X direction can be variously changed in order to adjust the strength of the magnetic attractive force.

  In the lens driving device 10 according to the present embodiment, the outer diameter of the magnetic member 30 is a value approximately between the inner diameter and the outer diameter of the first coil 141 (see FIG. 1 or FIG. 2). As a result, it is possible to suppress a radial magnetic attractive force between the magnetic member 30 and the yoke 16, and the movable lens body such as the lens 12 a and the lens barrel 12 is eccentric with respect to the optical axis X. Can be prevented. From this point of view, it can be said that the outer diameter of the magnetic member 30 is preferably smaller than the intermediate value described above.

[Embodiment 2]
FIG. 4 is a diagram showing an outline of the mechanical configuration of the lens driving device 10A according to Embodiment 2 of the present invention.

In FIG. 4, in the lens driving device 10 </ b> A, unlike the lens driving device 10 shown in FIG. 3B, the magnetic member 30 is removed and the leaf spring 131 is a magnetic member that is magnetically attracted to the magnet 17. Accordingly, the sleeve 15 (moving lens body) is held by the magnetic attractive forces F _m1 and F _m2 acting between the leaf spring 131 and the magnet 17 via the first coil 141. Since other configurations are the same as those of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.

  As described above, according to the lens driving device 10A, it is possible to prevent the sleeve 15 from being shaken or rattled. Variations in stationary position accuracy can be suppressed.

  In view of the fact that the leaf spring 131 has a function as a terminal (terminal) for energizing the first coil 141 as described above, the material thereof is, for example, copper-based or phosphorus-based magnetic stainless steel. It is preferable that

[Other embodiments]
FIGS. 5A and 5B are diagrams showing an outline of a mechanical configuration of lens driving devices 10B and 10C according to another embodiment of the present invention.

  As shown in FIGS. 5A and 5B, in the lens driving devices 10C and 10D, unlike the lens driving devices 10A and 10B described with reference to FIGS. 3B and 4, the sleeve 15 (moving lens) is used. In the body), the coil 141 is held only on the subject side with respect to the magnet 17, and the coil 141 is not held on the holder receiver 19 side with respect to the magnet 17.

Of the lens driving devices 10C and 10D configured as described above, in the lens driving device 10C, the sleeve 15 is held by the magnetic attractive forces F _m1 and F _m2 acting between the magnetic member 30 and the magnet 17. . The sleeve 15 (moving lens body) is held by the magnetic attractive forces F _m1 and F _m2 that act between the leaf spring 131 and the magnet 17. Since other configurations are the same as those of the first and second embodiments, common portions are denoted by the same reference numerals and description thereof is omitted.

In the above embodiment, the coil and the magnet are arranged in the lens optical axis direction, but one of the coil and the magnet is held on the outer peripheral surface of the moving lens body, and the other is held on the inner peripheral surface of the fixed body. You may employ | adopt the structure currently made.

  The magnetic member 30 is not limited to an annular shape. For example, a plurality of magnetic members may be arranged coaxially with the lens optical axis, that is, at equiangular intervals in the circumferential direction. Specifically, there are magnetic members such as a ball shape, a wire shape, and a rod shape, and a configuration in which a magnetic urging force acting between the magnetic member and the magnet is applied to the moving lens body may be adopted. Good. For magnetic members such as balls, wires, and rods, if they are arranged so that the lens optical axis is positioned at the center of the plurality of magnetic members, the positions are shifted from the equiangular interval around the lens optical axis. A plurality of magnetic members may be disposed on the surface. Furthermore, magnetic members such as balls, wires, and rods may be arranged so that the numbers and sizes are different around the lens optical axis and used for adjusting the tilt of the moving lens body.

[Usage example of lens driving device]
The lens driving device 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 capable of stabilizing the stationary position accuracy of the lens unit.

It is sectional drawing which shows the machine structure of the lens drive device which concerns on embodiment of this invention. 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 is hold | maintained in a lens drive device. It is a figure which shows the outline of the mechanical structure of the lens drive device which concerns on other embodiment of this invention. It is a figure which shows the outline of the mechanical structure of the lens drive device which concerns on other embodiment of this invention.

Explanation of symbols

10, 10A, 10B, 10C Lens drive device 11 Cover holder (fixed body)
12 barrel 12a lens 131, 132 leaf spring 141, 142 first coil, second coil (elastic member / regulating member)
15 Sleeve (moving lens body)
16 Yoke (fixed body)
17 Magnet 18 Entrance window 19 Holder holder (fixed body)
30 Magnetic members

Claims (5)

In a lens driving device comprising: a moving lens body provided with a lens; a fixed body that supports the moving lens body so as to be movable in the lens optical axis direction; and a drive mechanism that moves the moving lens body in the lens optical axis direction. ,
The drive mechanism is attached between a coil held by the moving lens body, a magnet held by the fixed body, and the moving lens body and the fixed body, and the moving lens body is moved from a stationary position to a subject. An elastic member that applies an elastic force against the movement to the moving lens body when attempting to move to the side, and a magnetic member that is held by the moving lens body on the side where the subject is located from the magnet. ,
When an electromagnetic force for supplying current to the coil to move the moving lens body from the stationary position to the subject side is generated, the electromagnetic force and the elastic force are balanced to bring the moving lens body to the subject side position. Stop,
When the current supply to the coil is stopped, the moving lens body is moved toward the stationary position by the elastic force of the elastic member, and the magnetic attraction force generated between the magnet and the magnetic member A lens driving device characterized by holding a moving lens body at the stationary position.   The lens driving device according to claim 1, wherein the magnetic member is disposed coaxially with a lens optical axis. In a lens driving device comprising: a moving lens body provided with a lens; a fixed body that supports the moving lens body so as to be movable in the lens optical axis direction; and a drive mechanism that moves the moving lens body in the lens optical axis direction. ,
The drive mechanism is attached between the moving lens body and the fixed body on the side where a subject is located from the magnet, a coil held by the moving lens body, a magnet held by the fixed body, An elastic member that applies an elastic force against the movement to the moving lens body when the moving lens body is about to move from a stationary position to the subject side, and
The elastic member is a magnetic member,
When an electromagnetic force for supplying current to the coil to move the moving lens body from the stationary position to the subject side is generated, the electromagnetic force and the elastic force are balanced to bring the moving lens body to the subject side position. To stop
When the current supply to the coil is stopped, the moving lens body is moved toward the stationary position by the elastic force of the elastic member, and is generated between the magnet and the elastic member made of the magnetic member. A lens driving device, wherein the moving lens body is held at the stationary position by a magnetic attraction force. The fixed side object from said magnet is positioned between the moving lens body and first elastic member mounted between said fixed body, the side where the object from the magnet is positioned with said movable lens element on the opposite side A second elastic member attached between the body,
The lens driving device according to claim 3, wherein the first elastic member of the first elastic member and the second elastic member is the elastic member as the magnetic member.   5. The lens driving device according to claim 1, wherein the coil is disposed between the magnet and the magnetic member in an optical axis direction of the lens.

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