JP2007248964A - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive device which reduces power consumption when switching a mode from a normal mode to a closeup mode and thus, to raise power use efficiency. <P>SOLUTION: The lens drive device 10 has a mobile lens object (such as a sleeve 15) having a lens, a driving mechanism and a fixing object (such as a yoke 16), where in the driving mechanism has a magnet 17, a plurality of coils 14, 14', either of the magnet 17 or the plurality of coils 14, 14' is provided to the mobile lens object and the other is provided to the fixing object, the drive mechanism has regulation means (flat springs 13, 13') which regulate transfer of the mobile lens object based on first electromagnetic force when the first electromagnetic force is generated by supplying current to the plurality of coils 14, 14' and regulate transfer of the mobile lens object based on second electromagnetic force when the second electromagnetic force in the opposite direction of the first electromagnetic force is generated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  In recent years, many high-performance mobile phones incorporating various functions have been sold. For example, most of mobile phones currently on sale have various functions such as a camera function, a moving image shooting function, and a voice recorder function. Of these, mobile phones with built-in camera functions can generally be selected from two modes: a normal mode for taking pictures of friends and scenery, and a close-up mode (macro mode) for taking pictures of bus timetables and petals. It has become. Specifically, a mobile lens body having a lens is provided in a mobile phone, and the mobile lens body is moved by a magnetic drive mechanism so that any mode can be selected (for example, a patent). Reference 1).

  The lens driving device disclosed in Patent Document 1 includes a moving lens body (lens support body) including a lens and a driving mechanism including a coil and a spring, and the electromagnetic force generated by energizing the coil. The moving lens body is moved in the optical axis direction of the lens so that the normal mode and the close-up mode can be appropriately switched.

  Here, in the lens driving device disclosed in Patent Document 1, the moving lens body in the normal mode is located at the end of the movable range. In this state, the movable lens body is biased (pressed) to the base (base) by the spring. As a result, the moving lens body is prevented from shaking and rattling and the impact resistance is improved. On the other hand, in the close-up mode, the coil is energized to generate electromagnetic force, and the moving lens body is moved to a position where the electromagnetic force and the spring stress (biasing force) are balanced. This balanced position is the end of the movable range of the moving lens body, and is the end opposite to the position of the moving lens body in the normal mode.

Japanese Patent Laying-Open No. 2005-128392 (FIG. 1)

  However, when the moving lens body in the normal mode is positioned at the end of the movable range, there is a problem that power consumption for switching to the close-up mode is large.

  That is, the moving lens body is urged in one direction by the spring as described above, and moves from the normal mode position to the close-up mode position on the contrary, and moves from end to end in the movable range. In this case, because the moving distance of the moving lens body is long, a large amount of power (electric power) is needed to overcome the weight of the moving lens body and the stress of the spring. There is a problem that is large.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a lens driving device capable of reducing power consumption when switching from the normal mode to the close-up mode, and thus improving the power usage efficiency. There is.

  In order to solve the above problems, the present invention provides the following.

  (1) A moving lens body provided with a lens, a drive mechanism that moves the moving lens body in the optical axis direction of the lens, and a fixed body that supports the moving lens body so as to be movable in the optical axis direction of the lens. And the driving mechanism includes a magnet magnetized in a direction orthogonal to the optical axis direction of the lens, and a plurality of coils arranged so that the magnet is interposed in the optical axis direction of the lens. One of the magnet and the plurality of coils is provided on the moving lens body, the other is provided on the fixed body, and the drive mechanism supplies current to the plurality of coils. When the first electromagnetic force is generated, the movement of the moving lens body based on the first electromagnetic force is restricted, and the second electromagnetic force in the direction opposite to the first electromagnetic force is generated, First Lens driving device, characterized in that it comprises a regulating means for regulating the movement of the moving lens body based on an electromagnetic force.

  According to the present invention, the lens driving device is provided with a moving lens body provided with a lens, a driving mechanism for moving the lens body, and a fixed body for supporting the moving lens body, and the driving mechanism includes a magnet and a plurality of coils. Is provided. When a current is supplied to the plurality of coils to generate the first electromagnetic force and the movable lens body is moved in one direction (for example, in the normal mode), a regulating force is applied to the movable lens body by the regulating means, Unrestricted movement of the moving lens body is restricted. On the other hand, when the second electromagnetic force in the direction opposite to the first electromagnetic force is generated and the moving lens body is moved in the direction opposite to the one direction (in the close-up mode), it is moved by the regulating means. A restriction force is applied to the lens body, and unlimited movement of the moving lens body is restricted.

  That is, in a standby state in which no current is supplied to the coil, the movable lens body is not an end (a position where the movable lens body can move only in one direction) but a position where the movable lens body can move in both directions (for example, Intermediate position). Therefore, compared to the conventional lens driving device, the distance that the moving lens body moves before the close-up mode can be shortened, so that the power consumption when switching to the close-up mode is reduced, and thus the power usage efficiency is increased. Can do.

  In addition, if the distance that the moving lens body moves is shortened, it is not necessary to use a magnet that is as strong as the conventional lens driving device, and it is possible to use a magnet that is inexpensive and easy to obtain, thus reducing the manufacturing cost of the lens driving device. Can be reduced.

  Furthermore, according to the present invention, it is possible to improve the focus adjustment function of the lens. More specifically, when the moving lens body is moved from end to end in the movable range as in a conventional lens driving device, for example, a spring or the like is caused due to the long movement distance. There is a possibility that the sag of the restricting means becomes large and the linearity between the restricting force by the restricting means and the moving distance of the moving lens body is deteriorated. However, according to the present invention, it is possible to reduce the distance that the moving lens body is moved, and thus it is possible to prevent the linearity from deteriorating due to a large sag of the restricting means, and thus improving the focus adjustment function. Can be made. If the distance to which the moving lens body is moved can be shortened, the focus error due to hysteresis can be reduced, and in this sense, the focus adjustment function can be improved.

  Here, the “regulating means” means means for generating a force (regulating force) opposite to the moving direction of the moving lens body, and the regulating force changes according to the moving amount of the moving lens body. Is preferred. For example, an elastic member such as a leaf spring, a coil spring, a magnetic spring, or rubber may be used, 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 the present specification, “regulate” does not mean that the moving lens body is not moved, but means that the moving lens body is prevented from moving in an unlimited manner.

  Also, “when the first electromagnetic force (second electromagnetic force) is generated” is not intended to exclude “when the first electromagnetic force (second electromagnetic force) is not generated”. . That is, the above-described “regulating means” regulates the movement of the moving lens body (even if some elastic force is applied) when no electromagnetic force is generated without supplying current to the plurality of coils. )I do not care.

  (2) The lens according to (1), wherein the moving lens body is held at a substantially intermediate position in a movable range of the moving lens body when no current is supplied to the plurality of coils. Drive device.

  According to the present invention, the moving lens body described above is held at a position approximately in the middle of the movable range when no current flows through the plurality of coils (that is, in a standby state) Compared with the conventional lens driving device, the distance that the movable lens body moves before the close-up mode can be reduced by about half, and thus the power consumption when switching to the close-up mode can be reduced.

  (3) The lens driving device according to (1) or (2), wherein the restricting means is an elastic member that urges the moving lens body in the optical axis direction of the lens.

  According to the present invention, since the elastic member that urges the moving lens body in the optical axis direction of the lens is employed as the restricting means, the linearity between the elastic force of the elastic member and the moving distance of the moving lens body is adopted. The power use efficiency can be increased while preventing the deterioration of the power consumption.

  (4) The elastic member includes: a first elastic member that urges the moving lens body in one direction in an optical axis direction of the lens; and a second elastic member that urges the moving lens body in a direction opposite to the one direction. The lens driving device according to (3), wherein the lens driving device is configured.

  According to the present invention, the elastic member described above is composed of two first elastic members and a second elastic member, one of which biases the moving lens body in one direction of the optical axis direction of the lens and the other Is biased in the direction opposite to the one direction, so that the elastic force of the first elastic member and the elastic force of the second elastic member are balanced in the middle of the movable range of the movable lens body. be able to.

  Therefore, for example, after the photographing is finished, the moving lens body can be returned naturally using the elastic force of the elastic member in order to return the moving lens body from the position of the normal mode or the close-up mode to the standby state, thereby reducing power consumption. Can be suppressed. By using two elastic members, the adverse effect of external forces such as centrifugal force can be relatively reduced, and the above-described linearity can be further improved.

  (5) The lens driving device according to (4), wherein the first elastic member and the second elastic member are metal elastic members that energize the plurality of coils.

  According to the present invention, as the first elastic member and the second elastic member described above, the metal elastic members that energize the plurality of coils are adopted, so that the first elastic member and the second elastic member are The power use efficiency can be increased while functioning as a current-carrying wiring for a plurality of coils. In addition, the electric circuit configuration (circuit wiring) of the lens driving device can be facilitated, and the entire lens driving device can be reduced in size.

  According to the lens driving device of the present invention, it is possible to shorten the distance that the moving lens body moves before the close-up mode is entered, so that the power consumption when switching to the close-up mode is reduced, and consequently the power use efficiency is increased. Can do. In addition, the accuracy of linearity and hysteresis can be improved.

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

[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 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. Inside the sleeve 15 is attached a substantially cylindrical lens barrel 12 (not shown in FIG. 1; see FIG. 3) in which the optical axis X is located at the center. A lens 12a is provided (see FIG. 3). 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. 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 oriented in the direction of the optical axis X in relation to the first coil 14. The second coil 14 ′ is arranged so that the intervenes. 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. This improvement in linearity will be described in detail with reference to FIG. FIG. 2 is a diagram showing hysteresis characteristics of the leaf springs 13 and 13 ′. The horizontal axis indicates the position of the sleeve 15, and the vertical axis indicates the electromagnetic force (that is, the magnitude of the voltage applied to the first coil 14 and the second coil 14 ′) described later. In FIG. 2, the relationship between the position and the electromagnetic force ideally draws a curve as shown by a curve P. However, actually, a curve as shown by the curve Q is drawn under the influence of the hysteresis characteristics of the leaf springs 13 and 13 ′. Therefore, the shorter the moving distance from the position x ₀ (electromagnetic force F ₀ ), the closer to the curve P, the better the linearity. Specifically, the sleeve 15, when only moves from position _{x 0} to the position _{x 1} (when the moving distance is _x 0 -x ₁ is), _x 1 -x from the position _{x 1} 'which is the target "while will deviate only, the sleeve 15 when moving from the position _{x 0} to the position _{x 2} (when the moving distance is _x 0 -x ₂ are) located _{x 2} that is a target _'1 from x ₂ −x ₂ ′ (> x ₁ −x ₁ ′) will shift. Therefore, the shorter the moving distance from the position x _0, approaches the curve P, it will be improved linearity.

  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). On the other hand, the lens driving device 10 is provided with a leaf spring 13 and a leaf spring 13 ′ that restrict the movement of the sleeve 15 (see FIG. 1A). 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. The overall size of the lens driving device 10 is reduced.

  The sleeve 15 is provided with energization wirings 20 for the first coil 14 and the second coil 14 '(see FIG. 1A). As a result, the current flowing through the first coil 14 and the current flowing through the second coil 14 'can be made equal, and current control is facilitated.

[Assembly method]
Next, a method for assembling the lens driving device 10 will be described.

  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 barrel 12 having the lens 12 a is incorporated in the sleeve 15 in advance. 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 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 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. 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 outer side in the radial direction, and this serves as a power feeding portion to the coil.

[Machine operation]
FIG. 4 is an explanatory diagram for explaining the mechanical operation of the sleeve 15 in the lens driving device 10. 4A to 4F 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.

  First, a case where the lens driving device 10 is switched from the standby state to the close-up mode will be described. FIG. 4A shows a standby state of the lens driving device 10. At this time, as shown in FIG. 4B, 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 '. That is, a current is passed from “back” to “front” of the page. Then, the energized first coil 14 and second coil 14 ′ placed in a magnetic field each receive an upward (front) electromagnetic force F _H (first electromagnetic force) (the arrow in FIG. 4C). reference). Thereby, the sleeve 15 to which the first coil 14 and the second coil 14 ′ are fixed starts to move forward. The sleeve 15 stops at a position where the electromagnetic force 2 × F _H and the elastic force F _S1 and the elastic force F _S2 by the plate spring 13 and the plate spring 13 ′ are balanced (position in the close-up mode).

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. An approximately equal electromagnetic force F _H acts on the 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.

Further, when the photographing in the close-up mode is completed, the current supply to the first coil 14 and the second coil 14 ′ is stopped. Then, as shown in FIG. 4D, since only the elastic force F _S1 and the elastic force F _S2 remain, the sleeve 15 naturally returns to the standby state position (see FIG. 4A). .

Next, a case where the lens driving device 10 is switched from the standby state to the normal mode will be described. It may be considered in the same way as switching to the close-up mode described above. That is, the magnetic flux emitted from the N pole of the magnet 17 passes in the order of the sleeve 15 → the first coil 14 or the second coil 14 ′ → the yoke 16, and the first coil 14, the second coil 14 ′, the yoke 16, and the sleeve. While a magnetic circuit (magnetic path) is formed by a member 15, a current is passed in the direction opposite to that in the close-up mode (from “front side” to “back side”). Then, the first coil 14 and the second coil 14 ′ receive a downward force (rear side) by the action of the electromagnetic force F _H (second electromagnetic force), and the first coil 14 and the second coil 14 ′ are fixed. The sleeve 15 thus moved starts to move to the rear side (normal mode). The sleeve 15 stops at a position (position in the normal mode) where the electromagnetic force 2 × F _H and the elastic force F _S3 and the elastic force F _S4 by the plate spring 13 and the plate spring 13 ′ are balanced.

As described above, when shooting in the normal mode is completed, the current supply to the first coil 14 and the second coil 14 'is stopped. Then, as shown in FIG. 4F, only the elastic force F _S3 and the elastic force F _S4 remain, so the sleeve 15 naturally returns to the standby position (see FIG. 4A). .

  FIG. 5 is an explanatory diagram for explaining the mechanical operation of the sleeve 15 in comparison with a conventional lens driving device. 5A and 5B show the conventional lens driving device, and FIGS. 5C to 5E show the lens driving device 10 according to the present embodiment. For convenience of explanation, the sleeve 15 is not shown, and a leaf spring 13 ′ operating in conjunction with the sleeve 15 is shown. The position of the lens barrel 12 (see FIG. 3) fixed to the sleeve 15 is indicated by the hatched portion in the center of each figure.

  As shown in FIG. 5 (a), the conventional lens driving device is in the position A (the position in the normal mode is the same) in the standby state, and moves to the position B in the close-up mode shown in FIG. 5 (b). In order to achieve this, it was necessary to move the distance D. On the other hand, as shown in FIG. 5D, the lens driving device 10 according to the present embodiment is at the position A in the standby state. That is, it is at an intermediate position between the position B in the close-up mode and the position C in the normal mode. Therefore, when moving to the position B in the close-up mode, it is only necessary to move the distance D / 2 (see FIG. 5C), and when moving to the position C in the normal mode, the distance D / It is sufficient to move by 2 (see FIG. 5E).

  As described above, according to the lens driving device 10 according to the present embodiment, the distance that the sleeve 15 moves before switching to the close-up mode can be halved (D → D / 2) (FIG. 5 ( a) → FIG. 5 (b), FIG. 5 (d) → FIG. 5 (c)), it is possible to reduce power consumption when switching to the close-up mode, and to increase power use efficiency.

  Further, for example, by increasing the spring constants of the leaf spring 13 and the leaf spring 13 ′, the sleeve 15 can be stably held even in the standby state shown in FIG. Even if the spring constant is increased, the lens driving device 10 shortens the distance that the sleeve 15 moves before switching to the close-up mode, so that the power consumption is not particularly increased.

  Further, if the distance that the moving lens body moves becomes short, an inexpensive and easily available magnet can be used, and the linearity between the elastic force of the leaf springs 13 and 13 'and the moving distance of the sleeve 15 can be improved. It is also possible to reduce the focus error due to hysteresis.

  In the present embodiment, the first coil 14 and the second coil 14 ′ are provided on the sleeve 15, but may be provided on the yoke 16 side. Similarly, the magnet 17 may be provided on the sleeve 15 side.

  The lens driving device according to the present invention is useful as a device capable of reducing power consumption when switching from the normal mode to the close-up mode, and thus improving the power usage efficiency.

It is sectional drawing which shows the machine structure of the lens drive device which concerns on embodiment of this invention. It is a figure which shows the hysteresis characteristic of a leaf | plate spring. 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 the mechanical operation | movement of the sleeve in a lens drive device. It is explanatory drawing for demonstrating the mechanical operation | movement of a sleeve in comparison with the conventional lens drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lens drive device 11 Cover holder 12 Lens barrel 12a Lens 13, 13 'Leaf spring 14, 14' 1st coil, 2nd coil 15 Sleeve 16 Yoke 17 Magnet 18 Incident window 19 Holder receptacle

Claims (5)

A moving lens body with a lens;
A drive mechanism for moving the moving lens body in the direction of the optical axis of the lens;
A fixed body that movably supports the moving lens body in the optical axis direction of the lens,
The driving mechanism is a lens driving device including a magnet magnetized in a direction perpendicular to the optical axis direction of the lens and a plurality of coils arranged so that the magnet is interposed in the optical axis direction of the lens. And
One of the magnet and the plurality of coils is provided on the moving lens body, and the other is provided on the fixed body.
When the drive mechanism supplies a current to the plurality of coils to generate a first electromagnetic force, the drive mechanism restricts the movement of the moving lens body based on the first electromagnetic force and is opposite to the first electromagnetic force. A lens driving device comprising: a restricting means for restricting movement of the movable lens body based on the second electromagnetic force when a second electromagnetic force in the direction is generated.   The lens driving device according to claim 1, wherein the moving lens body is held at a substantially intermediate position in a movable range of the moving lens body when no current is supplied to the plurality of coils.   3. The lens driving device according to claim 1, wherein the restricting means is an elastic member that urges the moving lens body in the optical axis direction of the lens.   The elastic member includes a first elastic member that urges the moving lens body in one direction of the optical axis direction of the lens, and a second elastic member that urges the moving lens body in a direction opposite to the one direction. The lens driving device according to claim 3, wherein The lens driving device according to claim 4, wherein the first elastic member and the second elastic member are metal elastic members that energize the plurality of coils.

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