KR100847980B1 - Lens drive device, imaging device, imaging instrument, lens position adjustment method, and lens drive method - Google Patents

Abstract

The lens drive device includes a lens frame having lenses 2a and 2b for photographing a subject, and guide holes 35 that hold the lenses 2a and 2b and are formed substantially parallel to the optical axes of the lenses 2a and 2b. (3), a fixed portion having a guide shaft (4) slidably coupled to the guide hole (35) and guiding the lens frame (3) in the optical axis direction, and a coil (5) fixed to the lens frame (3). ), A magnet 7 engaged with the coil 5, and a yoke 6 with the magnet 7 attached thereto. The yoke 6 is configured to be movable in the optical axis direction of the lenses 2a and 2b.

Description

LENS DRIVE DEVICE, IMAGING DEVICE, IMAGING INSTRUMENT, LENS POSITION ADJUSTMENT METHOD, AND LENS DRIVE METHOD}

The present invention relates to a lens driving device for driving a lens, and an imaging device, an imaging device, a lens position adjusting method, and a lens driving method using the lens driving device.

Conventionally, various methods for adjusting the initial position of a lens have been proposed in the camera which moves a lens and adjusts a focus (for example, patent document 1, 2). In the method described in Patent Document 1, the male frame formed on the outer circumferential surface of the lens frame holding the lens and the female screw provided in the barrel on which the imaging element is mounted are screwed to rotate the lens frame, thereby rotating the lens frame relative to the barrel. To adjust the initial position of the lens with respect to the imaging surface of the imaging device. Moreover, the method of patent document 2 provides the ring-shaped cam mechanism between a lens frame and a barrel, and moves a lens frame to an optical axis direction with respect to a barrel by this cam mechanism, and the initial position of a lens is changed. To adjust.

Patent Document 1: Japanese Patent Laid-Open No. 2002-374439 (paragraph 0009, Fig. 1)

Patent Document 2: Japanese Patent Application Laid-open No. Hei 7-67017 (paragraph 0017, Fig. 3)

By the way, in recent years, the demand which mounts an imaging function in mobile devices, such as a mobile telephone and a portable device, is increasing. These mobile devices are preferably small in nature. On the other hand, miniaturization and thickness reduction are also expected strongly about the digital still camera which is an imaging device. On the basis of such a situation, miniaturization (and consequently light weight) is also required for imaging devices mounted in mobile devices and digital still cameras.

Therefore, in order to respond to the request for downsizing of the imaging device, a lens driving device for driving a lens using a voice coil motor instead of a conventional stepping motor has been proposed.

Since the voice coil motor can be linearly driven and there is no need to convert the rotational motion into a linear motion like the stepping motor, the image capturing apparatus can be made smaller than in the case of using the stepping motor.

Here, when the voice coil motor is used for lens driving, it is necessary to adjust the initial position of the lens when assembling the lens driving apparatus. That is, in the case of the stepping motor, since it has a holding force even in a state where no current flows (non-energized state), the lens is moved by the motor after the camera is started to focus the lens on the solid-state imaging element, and then, In the non-energized state, the lens can be kept in the position where focus is achieved. However, in the case of the voice coil motor, the lens cannot be held at any position in the non-energized state. Therefore, in the non-energized state (to suppress power consumption), it is necessary to focus the lens so that the subject and the composition can be determined at the time of preview. In this case, it is effective to adjust the initial position of the lens such that the non-energized state, i.e., the lens is focused at infinity in the initial position.

However, when the lens driving device using the voice coil motor is adopted in the method of adjusting the initial position of the lens described in Patent Document 1, a holder is formed on the outer circumferential surface of the lens frame holding the lens to hold the coil or magnet. The female screw is formed in the portion, and the lens frame is attached to the holder portion in a state where the male screw and the female screw are screwed together. In this case, since screw portions must be formed in the lens frame and the holder, these must be enlarged in the lens radial direction, for example, and this becomes a hindrance to downsizing the lens driving apparatus.

In addition, even when the method for adjusting the initial position of the lens described in Patent Document 2 is employed, the cam mechanism is required, so that the lens driving apparatus is enlarged.

This invention is made | formed in view of such a subject, and the objective is to miniaturize a lens drive apparatus.

Summary of the Invention

A lens driving apparatus according to the present invention includes a lens frame having a lens for photographing a subject, a guide frame holding the lens, and formed in substantially parallel to an optical axis direction of the lens, and slidably coupled to the guide hole. And a fixing portion having a guide shaft for guiding the lens frame in the optical axis direction, a coil fixed to the lens frame, a magnet opposite the coil, and a yoke with the magnet attached thereto, the yoke Is movable in the optical axis direction.

Effects of the Invention

Since the lens drive device according to the present invention has the above configuration, the lens drive device itself can be miniaturized.

1 is a plan view of a lens driving apparatus according to Embodiment 1 of the present invention;

2 is a cross-sectional view (b) showing an enlarged side sectional view (a) and a part of a lens driving apparatus according to Embodiment 1 of the present invention;

3 is a perspective view of a lens driving apparatus according to Embodiment 1 of the present invention;

4 is a rear view of the lens driving apparatus according to Embodiment 1 of the present invention;

5 is a sectional view showing a magnetic circuit of the lens driving apparatus according to Embodiment 1 of the present invention;

6 is a perspective view of a lens driving apparatus according to Embodiment 2 of the present invention;

7 is a view showing the shape of the lens eccentric pin according to the second embodiment of the present invention;

8 is a side view of a lens driving apparatus according to Embodiment 3 of the present invention;

9 is an exploded perspective view of a lens driving apparatus according to Embodiment 3 of the present invention;

10 is an exploded perspective view of a lens driving apparatus according to Embodiment 3 of the present invention;

11 is a perspective view of an imaging device according to Embodiment 4 of the present invention;

12 is a perspective view of an imaging device according to Embodiment 4 of the present invention;

13 is an exploded perspective view of a shutter mechanism according to Embodiment 4 of the present invention;

14 is a sectional view for explaining the structure and operation of the lens driving apparatus according to Embodiment 5 of the present invention;

15 is a cross-sectional view for explaining the operation of the lens driving apparatus according to the fifth embodiment of the present invention;

16 is a cross-sectional view for explaining the operation of the lens driving apparatus according to the fifth embodiment of the present invention;

17 is a timing chart for explaining an example of the operation of the lens driving apparatus according to the fifth embodiment of the present invention;

18 is a timing chart for explaining another example of the operation of the lens driving apparatus according to the fifth embodiment of the present invention;

19 is a sectional view for explaining the structure and operation of the lens driving apparatus according to Embodiment 6 of the present invention;

20 is a timing chart for explaining an example of the operation of the lens driving apparatus according to Embodiment 6 of the present invention;

21 is a timing chart for explaining another example of the operation of the lens driving apparatus according to the sixth embodiment of the present invention;

22 is a perspective view for explaining a modification to Embodiments 1 to 6 of the present invention.

Explanation of symbols for the main parts of the drawings

2a: lens 2b: lens

3: lens frame 3a: lens frame unit

4: guide shaft 4a: external thread

4b: groove 5: coil

6: york 6a: female thread

6b: long hole 6c: side

7: magnet 7a: bottom

8: Magnetic Edition 9: Shutter Mechanism

9a: reference plane 9b: claw

9c: contact surface 9d, 9e: rib

9f: opening 9g: housing

9h: motor 9i: shutter blade

9j: sheet metal 9k, 9l: protrusion

9m: projection 10, 12, 13: lens drive

11: housing 11b: hole

11c: sliding standard 11d guide rib

11j: top face 11k: ore

40, 50, 60: imaging device 15: eccentric pin

15f: Cylindrical section 15g: Pin

15h: flange 15i: groove

31: small diameter frame portion 32: large diameter frame portion

33: support portion 33a: bottom surface

33b: projection 33c: top surface

34: coil holding part 35: guide hole

61, 62: wall portion 63: bottom portion

64: reference plane 65: cutout

66, 67: reference plane 91: solid-state imaging device

92: circuit board F ₁ : thrust

F ₂ : magnetic spring force F ₃ : gravity

F ₄ : Friction F ₄ (a): Static Friction

F ₄ (b): dynamic friction

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to attached drawing.

Embodiment 1

In the present embodiment, in the lens driving apparatus using the voice coil motor, the entire actuator including a coil attached to the movable portion of the voice coil motor holding the lens, a yoke that is a fixed portion of the voice coil motor, and a magnet attached to the yoke. By moving, the initial position of the lens is adjusted. That is, in the lens driving apparatus according to the present embodiment, the guide shaft for restricting the movement of the movable portion is supported by the housing of the imaging device with the lens driving apparatus, and the screw portion formed on the guide shaft and the screw portion formed on the yoke are provided. By screwing in, the entire actuator is movable.

<Structure>

First, the structure of the lens driving apparatus according to the present embodiment will be described. 1 is a plan view of the lens driving apparatus 10 according to the present embodiment. FIG. 2A is a sectional view (YZ sectional view) of the lens drive device 10 in the II-II line shown in FIG. 1. This lens drive device 10 is used as an autofocus mechanism (autofocus mechanism) of a short focus lens in an imaging device (for example, a small camera) mounted in an imaging device (for example, a mobile phone). Specifically, the lens drive device 10 moves the lenses 2a and 2b (FIG. 2A) along the optical axis A to move the object image onto the solid-state imaging element 91 (FIG. 2A). It is an image to).

As shown in Figs. 1 and 2 (a), the lens driving apparatus 10 includes a lens frame 3 which holds the lenses 2a and 2b so that their respective optical axes are coaxially positioned with the lenses. It has the guide shaft 4 which supports the frame 3 so that a movement is possible, and the yoke 6 to which the guide shaft 4 was fixed. 1 and 2 (a), the direction of the optical axis A (FIG. 2 (a)) of the lenses 2a and 2b is set as the Z direction, and one direction in the plane perpendicular to the optical axis A (Fig. 1 and 2) the left and right directions in (a) are referred to as the Y direction. Moreover, in the surface orthogonal to the optical axis A, the direction orthogonal to the Y direction is made into X direction. In the Z direction, the direction toward the subject is made upward (that is, the + Z direction), and the opposite direction, that is, the direction toward the solid-state imaging element 91 described later is made downward (that is, the -Z direction).

The lens frame 3 is adjacent to the frame portions 31 and 32 holding the lenses 2a and 2b and the Y direction (the radial direction of the lenses 2a and 2b) with respect to these frame portions 31 and 32. It has a support 33 formed integrally with each other. This support part 33 has a shape long in the Y direction. A guide hole 35 penetrating in the Z direction is formed in the support portion 33 of the lens frame 3, and the guide shaft 4 is slidably penetrated through the guide hole 35.

FIG. 2B is a view showing the lower end portion of the guide shaft 4, and shows an enlarged view of the portion enclosed by the circle B in FIG. 2A. As shown in FIG.2 (b), the male screw 4a is formed in the lower end of the guide shaft 4, and is screwed to the female screw 6a formed in the yoke 6. As shown to FIG. The tip of the male screw 4a of the guide shaft 4 penetrates the yoke 6 and projects further downward, and is inserted into the recess 11a formed at the bottom of the housing 11 of the imaging device. As a result, the guide shaft 4 is rotatably positioned around the center of the shaft. In addition, although the recessed part 11a is typically shown in FIG.2 (b), suppose that the recessed part 11a has sufficient inner diameter and depth for supporting the guide shaft 4. In the upper end of the guide shaft 4, as shown in Figs. 1 and 2, a groove 4b for rotating the guide shaft 4 around the shaft by a tool is formed. In addition, although the groove 4b was shown in the negative shape in FIG. 1, it may be plus shape or another shape.

The lens frame 3 is movable along the guide shaft 4 in the Z direction by sliding between the guide shaft 4 and the guide hole 35. In order to define the movable range in the Z direction of the lens frame 3, stoppers are respectively placed at positions reached when the lens frame 3 reaches the movement limit in the + Z direction and the movement limit in the -Z direction. Is provided. The stopper will be described later with reference to FIGS. 3 and 4.

3 is a perspective view of the lens driving device 10 shown in FIG. 1, and FIG. 4 is a rear view of the lens driving device 10 shown in FIG. The yoke 6 is, for example, a plate-shaped member that is bent in a U shape, and the bottom portion 63 and the wall portions 61 and 62 extending upward from both ends in the X direction of the bottom portion 63. Have. The bottom portion 63 is formed with a female screw 6a (FIG. 2B) that is screwed into the male screw 4a formed at the lower end of the guide shaft 4. The magnets 7 are attached to the inner surfaces of the wall portions 61 and 62 described above so as to sandwich the coil 5 in the X direction, respectively. Each magnet 7 opposes the edge extending in the Y direction of the coil 5. In addition, the rotation preventing member (for example, the guide rib 11d shown in FIG. 6) is provided in the housing 11 of the imaging device so that the yoke 6 does not rotate about the guide shaft 4. . 4, the front wall 62 of the yoke 6 is cut out and shown. The coil 5, the yoke 6, the magnet 7, and the guide shaft 4 (which also have the function as a yoke) are realized as the actuator.

As shown in FIG. 3 and FIG. 4, the movement limit in the + Z direction of the lens frame 3 is the top surface 33c of the protrusion 33b provided on the side surface of the support part 33 and the bottom surface of the magnet 7. It is the position where 7a contacts. The movement limit in the −Z direction of the lens frame 3 is a position where the bottom surface 33a of the support portion 33 contacts the top surface 63a of the bottom portion 63 of the yoke 6. The yoke 6 and the guide shaft 4 are each formed of a magnetic material, and constitute a magnetic circuit (described later) including the magnet 7.

Above the support part 33 of the lens frame 3, the coil holding part 34 ((a) of FIG. 2) is formed.

The coil 5 is wound around the coil holder 34 so as to surround the circumference of the guide shaft 4. The coil 5 is wound in a substantially rectangular shape so as to have two sides in the X direction and two sides in the Y direction.

As shown in FIG. 2, the solid-state imaging element 91 is fixed to the housing 11 of the imaging device by attaching a package to the housing 11 with an adhesive or the like. In addition, the circuit board 92 is fixed and electrically connected to this solid-state imaging element 91. In addition, both the solid-state imaging element 91 and the circuit board 92 may be fixed to the housing 11 with an adhesive, or only the circuit board 92 is fixed to the housing 11 with an adhesive, thereby providing a solid-state imaging element ( 91 may be indirectly fixed to the housing 11. In the lens driving apparatus 10 according to the present embodiment, the fixing portion is formed by the housing 11 and the circuit board 92. Moreover, the solid-state imaging element 91 and the guide shaft 4 which are fixed to these can also be included in a fixed part.

On the upper surface of the lens frame 3, a magnetic piece 8 made of a magnetic material is fixed so as to be located above the coil 5. When the lens frame 3 is in the movable range of the Z direction, the magnetic piece 8 is always positioned above the center position of the magnet 7 in the Z direction (+ Z side, that is, the subject side). It is arranged. This is because, when the energization to the coil 5 is stopped, the bottom surface of the support part 33 at the time of stopping the energization by utilizing the property that the magnetic piece 8 tries to move to the substantially center of the Z direction of the magnet 7. This is to hold the lens frame 3 at the position where 33a is in contact with the upper surface 63a of the bottom portion 63 of the yoke 6.

FIG. 5: is a schematic diagram for demonstrating the magnetic circuit of the lens drive apparatus 10, and respond | corresponds to sectional drawing (XZ sectional drawing) in the IV-IV line | wire of FIG. The two magnets 7 are arranged symmetrically in the X direction with respect to the guide shaft 4. Each magnet 7 is magnetized in the X direction such that the surface side fixed to the yoke 6 becomes the N pole and the side opposite to the coil 5 becomes the S pole. As a result, the variation in the Y direction of the coil 5 is located between the S pole of the magnet 7 and the guide shaft 4. The magnetic lines of force from the north pole of the magnet 7 travel along the wall portions 61 and 62 and the bottom portion 63 of the yoke 6, and also pass through the guide shaft 4 to form the coil holder 34 and Via the coil 5, the S pole of the magnet 7 is reached. When a current flows through the coil 5, an electromagnetic force in the axial direction (that is, Z direction) of the guide shaft 4 is generated in the coil 5 by the action of the current and the magnetic field caused by the magnet 7. Here, a current flows in the direction in which the electromagnetic force in the + Z direction (upward direction) is generated in the coil 5.

On the other hand, the magnetic piece 8 is always pressed toward the substantially center position (that is, the position with the highest magnetic flux density) of the magnet 7 in the Z direction by the magnetic field generated by the magnet 7. . As described above, when the energization to the coil 5 is stopped, the magnetic piece 8 utilizes the property of moving to approximately the center of the magnet 7 in the Z direction. Since the movable piece of the lens frame 3 is determined so that the magnetic piece 8 will always be located in the + Z direction side (the subject side) rather than the center of the Z direction of the magnet 7, it will always be in the lens frame 3. The pressing force in the -Z direction is acting. In addition, from the viewpoint of obtaining a large pressing force, the magnetic piece 8 is preferably made of a soft magnetic material such as nickel.

When an electromagnetic force in the + Z direction is generated by flowing a current in a predetermined direction through the coil 5, the lens frame 3 resists the pressing force in the -Z direction that the magnetic piece 8 receives from the magnet 7, and guides it. Move along the axis 4 in the + Z direction. The magnitude of the electromagnetic force can be changed by changing the current value flowing in the coil 5, and the lens frame 3 is moved to the guide shaft 4 to a position where the electromagnetic force in the + Z direction and the pressing force in the -Z direction are balanced. Can be moved accordingly.

When the current in the coil 5 is stopped, the electromagnetic force in the + Z direction is extinguished. Therefore, due to the pressing force in the -Z direction that the magnetic piece 8 receives from the magnet 7, the lens frame 3 is in the -Z direction. Return to the travel limit.

Here, when the lens frame 3 is at the limit of movement in the -Z direction, light from the infinity object is imaged on the imaging surface of the solid-state imaging element 91 by the lenses 2a and 2b. By moving the lenses 2a and 2b in the + Z direction (subject side) from this state, the solid-state imaging element 91 can form an image of a subject at a closer position. As a result, it is possible to photograph any subject from the infinity to the proximal position by auto focus.

In addition, as shown in FIG. 1, the magnet 7 is superimposed on a portion of the large diameter frame portion 32 (represented by reference numeral 32a) that holds the large diameter lens 2b. However, as shown in FIG. 4, since the clearance gap C larger than the movement amount E of the lens frame 3 is formed between the corresponding part 32a of the large diameter frame part 32, and the magnet 7, the lens Even if the frame 3 moves in the Z direction, it does not come into contact with the magnet 7.

<How to adjust the initial position>

Next, the adjustment method of the lens initial position of the lens drive apparatus 10 which concerns on this embodiment is demonstrated. First, when the lens frame 3 is at the limit of movement in the -Z direction, the lens frame 3 is formed so that light from an infinity object is imaged on the imaging surface of the solid-state imaging element 91 by the lenses 2a and 2b. And the positional relationship of the initial state with the solid-state image sensor 91 needs to be adjusted.

In the lens drive device 10 of the present embodiment, the male screw 4a formed on the guide shaft 4 rotates when the lens is rotated by the tool using the groove 4b formed at the upper end of the guide shaft 4. Since the male screw 4a of the guide shaft 4 and the female screw 6a formed on the yoke 6 are screwed together, the yoke 6 moves in the optical axis A direction by rotating the guide shaft 4. . The lens frame 3 is pressed in the -Z direction by the magnetic piece 8 and the magnet 7, and the upper surface of the bottom surface 33a of the lens frame 3 and the bottom portion 63 of the yoke 6. Since the 63a is in contact with each other, when the yoke 6 is moved in the optical axis A direction, the lens frames 3 are also moved at the same time, and the focal positions of the lenses 2a and 2b and the imaging surface of the solid-state imaging element 91 are adjusted. I can adjust it.

As described above, according to the present embodiment, the entire actuator including the lens frame 3, the coil 5, the yoke 6, and the magnet 7 is moved in the optical axis A direction by rotating the guide shaft 4. Since the lens initial position can be adjusted, the size of the lens can be made smaller than that of the conventional lens driving apparatus which performs screw fitting or cam mechanism. In particular, when a screw is formed on the outer periphery of the lens frame or a cam mechanism is provided, as in the conventional lens driving apparatus, the device dimension in the lens radial direction increases, but according to the present embodiment, the device dimension in the lens radial direction Can be made small. That is, in addition to miniaturization by using a motor (voice coil motor) capable of driving in the translational direction, as described above, the miniaturization of the structure for adjusting the lens initial position further reduces the lens drive device 10. Miniaturization becomes possible.

Further, since the male screw 4a of the guide shaft 4 and the female screw 6a of the yoke 6 are screwed together, the entire actuator including the lens frame 3 and the yoke 6 can be configured with a simple configuration. Can be moved in the optical axis direction. In addition, the contact limit of the lens frame 3 in the + Z direction is defined by the contact between the projection 33b and the magnet 7 of the lens frame 3, and the bottom surface 7a of the lens frame 3 Since the movement limit of the lens frame 3 in the -Z direction is defined by contact with the bottom portion 63 of the yoke 6, the movement range of the lens frame 3 can be regulated without providing a separate stopper. Can be.

Embodiment 2

In the present embodiment, as in the first embodiment, in the lens driving apparatus using the voice coil motor, the entire actuator including the coil attached to the movable part holding the lens, the magnet, and the yoke is driven. That is, the lens driving apparatus according to the present embodiment is configured to move the entire actuator including the yoke, the coil, and the magnet in the optical axis direction by adjusting the eccentric pin disposed on the side of the yoke to adjust the initial position of the lens. will be.

6 is a perspective view showing a lens drive device 12 according to Embodiment 2 of the present invention. FIG. 7: is a figure which shows the shape of the eccentric pin 15 used for the lens drive apparatus 12 which concerns on this embodiment. 6 and 7, the same reference numerals are given to the same components as those described in the first embodiment (FIGS. 1 to 5).

In FIG. 6, the long hole 6b is formed in one wall portion 61 of the yoke 6. The guide shaft 4 is fitted into the bottom surface of the housing 11 through a hole formed in the bottom surface 63 of the yoke 6, and the yoke 6 is in the optical axis A direction along the guide shaft 4. Can be moved to On the side surface of the housing 11, a hole 11b is formed at a position opposite to the elongated hole 6b formed in the wall portion 61 of the yoke 6. On the other hand, the guide ribs 11d provided on the inner side surface of the housing 11 are fitted to the side surfaces 6c of the other wall portion 62 of the yoke 6 so that the yoke 6 moves in the optical axis A direction. It regulates the slope of time. In addition, in FIG. 6, in order to make the structure between components clear, the length of the yoke 6 in the X direction is shown short. In addition, in FIG. 6, although the guide rib 11d is shown so that it may be separated from the yoke 6, in fact, the outer side surface 6c of the wall part 62 of the yoke 6 and the inside of the housing 11 are shown. The guide rib 11d is in contact with the yoke 6 so as to prevent inclination and rotation of the yoke 6.

As shown in FIG. 7, the eccentric pin 15 has a cylindrical portion 15f, an eccentric pin 15g having a center at a position deviated in the radial direction with respect to the center of the front end surface of the cylindrical portion 15f, It consists of the flange part 15h formed in the rear end of the cylindrical part 15f, and the groove 15i which engages the tool which rotates the eccentric pin 15. As shown in FIG. On the other hand, the hole 11b formed in the housing 11 has an inner diameter into which the cylindrical portion 15f can be inserted, as shown in FIG. 6, and a sliding reference plane 11c is formed inside the insertion direction. have. When the eccentric pin 15 is attached to the housing 11, the cylindrical portion 15f of the eccentric pin 15 is inserted into the hole 11b, and the side surface of the cylinder of the cylindrical portion 15f is attached to the sliding reference plane 11c. The pin 15g penetrates through the hole 11b and fits into the long hole 6b formed in the yoke 6.

In order to adjust the initial position of the lens, when the tool is coupled to the groove 15i and the eccentric pin 15g is rotated, the yoke 6 is provided through the long hole 6b fitted with the eccentric pin 15g. Moves in the optical axis A direction (Z direction). In this movement, not only the yoke 6 but the entire actuator including the lens frame 3, the coil 5, and the magnet 7 moves in the optical axis A direction.

As described above, according to the present embodiment, by using the eccentric pin 15, the lenses 2a and 2b and the solid are not enlarged (particularly in the lens radial direction), as in the first embodiment, without making the lens driving device 12 large. It is possible to perform the focal position adjustment of the initial state with the imaging surface of the imaging element 91. In other words, it is possible to adjust the initial position of the lens without increasing the lens drive device 12. Moreover, according to this embodiment, since the eccentric pin 15 can be accommodated almost in the thickness of the wall of the housing 11 of the imaging device, the dimension of the imaging device in the X direction can be made small.

In addition, in this embodiment, the eccentric pin 15 was provided only in the one wall part 61 of the yoke 6, and the guide rib 11d was provided so that only one wall part 62 of the yoke 6 may contact. The eccentric pin 15 may be provided on both wall portions 61 and 62, and the guide rib 11d may be provided to contact both wall portions 61 and 62.

Embodiment 3

In the present embodiment, the shutter mechanism portion is disposed on the subject side of the lens frame of the lens drive device, and the shutter mechanism portion is attached to the yoke.

8 is a side view illustrating a state in which the lens driving device 13 according to the present embodiment is assembled. 9 is a perspective view illustrating a state in which the lens driving device 13 is assembled. 10 is a perspective view showing a state before attaching the shutter mechanism portion to the yoke 6. In FIGS. 8-10, the same code | symbol is attached | subjected to the component same as the component demonstrated in Embodiment 1 (FIGS. 1-5).

8-10, the shutter mechanism part 9 which has opening part 9f (FIGS. 9-10) is arrange | positioned at the subject side of the lens 2a. The shutter mechanism part 9 has a housing 9g in which the opening portion 9f is formed so as to pass light incident on the lenses 2a and 2b (Fig. 2 (a) and the like). In this housing 9g, the attachment reference surface 9a which faces the lower side (direction opposite to a subject) is formed. As shown in FIG. 10, this attachment reference surface 9a is in contact with the reference surface 64 respectively formed in the upper end (edge of the subject side) of the wall parts 61 and 62 of the yoke 6, and thereby a shutter mechanism part Positioning of the optical axis A direction (ie, Z direction) of (9) is performed.

The shutter mechanism part 9 has a contact surface 9c facing the outer side in the X-direction on a portion protruding downward (the side opposite to the subject) of the housing 9g. As shown in FIG. 10, this contact surface 9c is in contact with the side surface 6d of the X direction inner side of the wall parts 61 and 62 of the yoke 6, and by this is the X direction of the shutter mechanism part 9 Positioning is made. The shutter mechanism part 9 has ribs 9d and 9e on both sides of the Y direction with respect to the contact surface 9c. The ribs 9d and 9e come in contact with the positioning reference planes 66 and 67 provided in the Y-direction both end surfaces of the upper portions (parts on which the reference plane 64 is formed) of the wall portions 61 and 62 of the yoke 6. Thus, positioning of the shutter mechanism 9 in the Y direction is achieved. The shutter mechanism part 9 has the claw 9b which protrudes below the housing 9g, and this claw 9b is provided in the notch part 65 provided in the both wall parts 61 and 62 of the yoke 6. As shown in FIG. By fitting, the shutter mechanism 9 is fixed to the yoke 6.

As described in the first and second embodiments, when adjusting the initial position with respect to the imaging surface of the solid-state imaging element 91 of the lenses 2a and 2b, in the lens drive device 13 according to the present embodiment, the shutter mechanism portion 9 ) Is integrated with the yoke 6 and moves in the Z direction.

When the shutter mechanism portion 9 is fixed to the housing 11 instead of the yoke 6, the distance between the lens 2a and the shutter mechanism portion 9 is such that the lens 2a, 2b is used when the pin position is moved from the infinity to the proximal position. ), In addition to the amount of moving to the subject side, it is necessary to further secure the amount of moving the lenses 2a and 2b at the time of adjusting the lens initial position. On the other hand, in the lens drive device 13 according to the present embodiment, the shutter mechanism 9 is fixed to the yoke 6, so that the lenses 2a and 2b and the shutter mechanism 9 are adjusted at the time of adjusting the lens initial position. ) Move together. Therefore, the distance between the lens 2a and the shutter mechanism portion 9 only needs to ensure an amount of moving the lenses 2a and 2b toward the subject side when the pin position is moved from the infinity to the proximal position. That is, by fixing the shutter mechanism part 9 to the yoke 6, the distance between the lens 2a and the shutter mechanism part 9 can be shortened.

In addition, the diameter of the opening part 9f provided in the shutter mechanism part 9 and the shutter blade which are not shown in order to shield the opening part 9f can be miniaturized so that the position of the opening part 9f is closer to the lens 2a. have. Therefore, if the shutter mechanism portion 9 is fixed to the yoke 6 like the lens drive device 13 according to the present embodiment, the opening 9f is compared with the structure of fixing the shutter mechanism portion 9 to the housing 11. And the shutter blade can be made small, whereby the shutter mechanism 9 can be made smaller.

Embodiment 4

In this embodiment, the imaging device WHEREIN: The part (collision reference) which hits the housing of an imaging device is provided in the subject side of a shutter mechanism part.

11 and 12 are perspective views showing the imaging device 40 according to Embodiment 4 of the present invention. In FIG. 11 and FIG. 12, the same code | symbol is attached | subjected to the component same as the component demonstrated in Embodiment 1 (FIGS. 1-5).

It is a schematic diagram which shows the structural example of a general shutter mechanism part. As shown in FIG. 13, the general shutter mechanism part includes a housing 9g made of a resin molded article, a shutter blade 9i housed inside the housing 9g, and a housing (for driving the shutter blade 9i). It consists of the motor 9h attached to 9g) and the sheet metal 9j which covers the subject side of the housing 9g.

When the imaging device incorporating the lens driving device is mounted in an imaging device (for example, a mobile device such as a mobile phone having an imaging function), the surface of the object side of the imaging device is hit against the inner surface of the housing of the imaging device. It is common to press and fix with elastic parts, such as a sponge, from the side opposite to the object side. However, if the shutter mechanism part is assembled in the imaging device, since the object side is comprised by the thin sheet metal 9j, it may deform by making it hit the inner surface of the housing of imaging devices, such as a mobile device.

As shown in FIG. 11, the imaging device 40 which concerns on this embodiment hits the surface (upper surface) on the subject side of the housing 9g of the shutter mechanism part 9 integrally with this housing 9g. It has projections 9k and 9l as reference. The protrusions 9k are formed one by one at both ends of the housing 9g in the X direction. The protrusion 9l is formed along one end of the housing 9g in the Y direction. Moreover, in order to increase the intensity | strength of the projection part 9k which becomes a reference | standard of a hit, the projection 9m is protrudingly formed in the substantially lower side (opposite side to a subject) of the housing 9g.

The lens drive device is assembled to the imaging device (for example, a built-in camera) after the adjustment of the lens initial position described in the first embodiment or the like is completed, but at this time, the projection 9m of the shutter mechanism portion 9 is opposed to the position. Adhesively fixed to the end surface (alignment surface) 11j in the Y-direction of the housing 11 of the imaging device in FIG. Moreover, the projection 9l of the shutter mechanism part 9 increases strength by adhesively fixing the side surface (rear end surface of Y direction) to the fitting surface 11k which is the opposing surface of the housing 11 of the imaging device.

Thus, when mounting the imaging device which assembled the lens drive apparatus to an imaging device (for example, mobile apparatuses, such as a mobile telephone which has an imaging function), the projection 9k, 9l of the shutter mechanism part 9 is equipped with an imaging device. It hits the inner surface of the housing, and presses and fixes it with elastic components, such as a sponge, from the circuit board 92 side. At this time, the projections 9k and 9l are formed in the housing 9g of the shutter mechanism part 9, and the projections 9l and 9m and the fitting surfaces 11j and 11k of the housing 11 are adhesively fixed. Since the strength of 9k and 9l is increasing, deformation of the housing 9g of the shutter mechanism part 9 is prevented.

As described above, according to the present embodiment, the projections 9k and 9l serving as the reference for hitting the housing 9g of the shutter mechanism portion 9 are integrally formed, and the projections 9m (proximate to the projection 9k). Formed) and the side surfaces of the projections 9l are fixed to the fitting surfaces 11j and 11k of the housing 11 so as to increase the strength of the projections 9k and 9l which are the bumping surfaces. Even when the shutter mechanism 9 is attached and fixed to the inner surface of the housing of the imaging device, deformation of the shutter mechanism 9 can be prevented.

In the third and fourth embodiments, the function of blocking incident light by using the shutter blades 9i of the shutter mechanism unit 9 is realized. However, in order to realize the photosensitive function, a photosensitive mechanism unit having a photosensitive filter is used. The photosensitive function can also be realized.

Embodiment 5

In the present embodiment, at the start of the imaging apparatus or at the start of photographing by the imaging apparatus, a current flows through the coil 5 to move the lens frame 3 toward the solid-state imaging element 91 so as to contact the reference plane. It is supposed to perform an operation.

14, 15, and 16 are cross-sectional views for explaining the structure and operation of the imaging device 50 according to Embodiment 5 of the present invention. 14-16, the same code | symbol is attached | subjected to the component same as the component demonstrated in Embodiment 1 (FIGS. 1-5). 17 and 18 are timing charts showing the operation of the imaging device 50.

As shown in FIG. 14, in the lens driving apparatus of the imaging device 50, the lens frames 3, the lenses 2a and 2b (FIG. 1, etc.), the coils 5, and the magnetic pieces 8 are provided. The lens frame unit 3a as a movable body is constituted. As described in the first embodiment and the like, since the magnetic piece 8 is pressed toward the approximately center position of the magnet 7 in the Z direction by the magnetic field generated by the magnet 7, the so-called lens frame 3 is called a so-called lens frame 3. Magnetic spring force is working. In addition, the yoke 6 and the magnet 7 form the fixed part with respect to the lens frame unit 3a which is a movable body.

In FIG. 14, the imaging device 50 is in a posture for photographing a subject on the ground side (gravity G direction). When no current flows through the coil 5, the force applied to the lens frame 3 is the magnetic spring force F ₂ , the gravity F _{3 applied} to the lens unit 3a, the guide shaft 4, and the lens frame 3. It is the friction force F ₄ which occurs between. The reference position of the solid-state imaging element 91 side (upward in the state shown in FIG. 14) of the lens frame 3 is the bottom surface 33a of the lens frame 3 and the bottom portion 63 of the yoke 6. Is determined by contact with In the bottom part 63 of the yoke 6, the surface which contacts the bottom face 33a of the lens frame 3 is set as the reference plane D. As shown in FIG.

In the state shown in FIG. 14, there is a gap between the bottom surface 33a of the lens frame 3 and the reference surface D (the contact surface of the bottom portion 63 of the yoke 6), and the lens frame 3 is the reference surface D. Is in a state away from When the magnetic spring force F ₂ (a) necessary to bring the lens frame 3 into contact with the reference plane D only by the magnetic spring force F ₂ is F ₂ (a), the magnetic spring force F ₂ (a) is

F ₂ (a)> F ₃ + F ₄

Need to satisfy

In FIG. 15, although the imaging device 50 is in the attitude | position which photographs the subject of the ground side (gravity G direction), the lens frame 3 is the reference surface D (bottom of the yoke 6) by the solid-state imaging element 91 side. (63). In order to prevent the lens frame 3 from falling off from the reference plane D, that is, a magnetic spring force for preventing a gap between the bottom face 33a of the lens frame 3 and the reference plane D is set to F ₂ (b), This magnetic spring force F ₂ (b) is

F ₂ (b) + F ₄ > F ₃

It is necessary to satisfy the magnetic spring force F ₂ (b),

F ₂ (b)> F ₃ -F ₄

Need to satisfy

Comparing F ₂ (a) and F ₂ (b), the magnetic spring force required to bring the lens frame 3 away from the reference plane D into contact with the reference plane D is F ₂ (a)> F ₂ (b). the side of the F ₂ (a), are required to know that he is greater than the spring force F ₂ (b), to maintain by the lens frame (3) in contact with the reference surface D of gravity F ₃ does not fall from the reference surface D.

In FIG. 16, the imaging device 50 is in a posture of photographing a subject opposite to the ground (ie, vertically upward), and the lens frame 3 is positioned on the reference plane D (bottom portion 63 of the yoke 6). Are in contact. The thrust F ₁ necessary for flowing a current through the coil 5 in this state and moving the lens frame 3 toward the subject side is

F ₁ > F ₂ + F ₃ + F ₄

Need to satisfy

Here, in order to downsize the imaging device 50, it is effective to downsize the lens drive device, and in order to do so, the magnet 7 and the coil 5 are made small. Therefore, it is necessary to set the thrust F ₁ small.

In order to reduce the force F _1, it can be seen that that from Equation (4), reducing the magnetic spring force F ₂ is valid. In the present embodiment, the magnetic spring force F ₂ satisfies the expression (3), but is made small so as not to satisfy the expression (1), thereby miniaturizing the magnet 7 and the coil 5.

However, even if the expression (3) is satisfied, if the expression (1) is not satisfied, the lens frame 3 separated from the reference plane D (bottom portion 63 of the yoke 6) cannot be brought into contact with the reference plane D. Therefore, in the present embodiment, the coil is started when the imaging device 50 is started to start preview (displaying the photographed image on the display unit) or start photographing (recording the photographed image). An electric current flows to (5), and the lens frame 3 is moved to the solid-state image sensor 91 side, and the operation which makes it contact the reference plane D is performed. Once the lens frame 3 contacts the reference plane D, the lens frame 3 remains in contact with the reference plane D even if the current of the coil 5 is stopped in order to satisfy the equation 3 at that time. Can be.

FIG. 17 shows an operation of moving the lens frame unit 3a by passing a current through the coil 5 at the start of the imaging device 50. When the power supply of the imaging device is turned ON (for example, when the power button is pressed), the current flows in the reverse direction to the coil 5 for a predetermined time. In addition, "reverse direction" means the direction of the electric current at the time of generating the electromagnetic force which moves the lens frame 3 toward the bottom part 63 of the yoke 6. Thereby, the lens frame 3 contacts the reference plane D, and thus is held. After passing a current through the coil 5 for a predetermined time, the preview screen is displayed.

FIG. 18 shows an operation of moving the lens frame unit 3a before starting the imaging, not at the start of the imaging device 50. In this case, when the photographing start button is pressed (turned ON), current flows in the reverse direction to the coil 5 for a predetermined time. Thereby, the lens frame 3 contacts the reference plane D, and thus is held. After passing a current through the coil 5 for a predetermined time, the autofocus operation described in the first embodiment or the like is performed. At the point of focus, recording of the captured image is started.

As described above, according to the present embodiment, the lens frame 3 can be held at the time of preview or photographing start without being separated from the reference plane D (bottom portion 63 of the yoke 6) and at the same time magnetic spring force. F ₂ can be made small. As a result, the lens driving device portion can be downsized, and the imaging device 50 can be further downsized.

Embodiment 6

In the present embodiment, the current flows through the coil 5 at the start of the imaging device or at the start of photographing to move the lens frame 3 in the optical axis direction, and between the guide shaft 4 and the lens frame 3. The frictional force F ₄ is reduced by changing the generated frictional force F ₄ from static friction to dynamic friction, and the magnetic spring force F ₂ causes the lens frame 3 to come into contact with the reference plane.

19 is a cross-sectional view for explaining the structure and operation of the imaging device 60 according to Embodiment 6 of the present invention. In FIG. 19, the same code | symbol is attached | subjected to the component same as the component demonstrated in Embodiment 1 (FIGS. 1-5). 20 and 21 are timing charts showing the operation of the imaging device 60.

In the lens driving device of the imaging device 60 shown in FIG. 19, when the lens frame 3 is stopped, the frictional force F ₄ generated between the guide shaft 4 and the lens frame 3 is the static frictional force F. ₄ (a), but when the lens frame 3 starts to move by the thrust F ₁ , the frictional force F ₄ becomes dynamic frictional force F ₄ (b). In general, the relationship between the static frictional force F ₄ (a) and the dynamic frictional force F ₄ (b) is

F ₄ (a)> F ₄ (b)

It becomes That is, it is possible to reduce the (also so that is, not the static friction the advent of such friction), the frictional force F ₄ by moving the lens frame (3).

Although the frictional force F ₄ can be made small by moving the lens frame 3 in one direction in the optical axis direction, the same effect can be obtained by making several reciprocating motions in the optical axis direction in order to reduce the amount of movement of the lens frame 3. Can be obtained. By setting the magnetic spring force so as to satisfy the F ₂ the equation (6) below, it is possible to reduce the magnetic spring force F _2, as a result, to reduce the size of the lens driving device, and further possible to reduce the size of the imaging device 60. The

F ₂ > F ₃ + F ₄ (b)

20 and 21 are timing charts showing the operation of the imaging device according to the present embodiment. FIG. 20 illustrates an operation of intermittently flowing a current through the coil 5 when the imaging device 60 is started, and causing the lens frame unit 3a to reciprocate in the optical axis direction. In this case, when the power supply of the imaging device is turned ON (for example, when the power button is pressed), the positive current flows intermittently through the coil 5. While the positive current flows through the coil 5, the lens frame 3 moves to the subject side by the thrust F ₁ . While the current flows through the coil 5, the lens frame 3 moves to the side opposite to the subject side (toward the bottom 63 of the yoke 6) by the magnetic spring force F ₂ . Since the lens frame 3 is moving, the frictional force generated between the guide shaft 4 is equal to the frictional force F ₄ (b), and the lens also has a small magnetic spring force F ₂ that satisfies the above expression (6). The frame 3 can be brought into contact with the bottom portion 63 (reference plane D) of the yoke 6. In this manner, the current is passed for a certain time, and then the preview screen is displayed.

Fig. 21 shows a case where the lens frame unit 3a is operated before recording of the captured image is started. When the photographing start button is pressed (turned ON), a positive current flows intermittently through the coil 5. While the positive current flows through the coil 5, the lens frame 3 moves to the subject side by the thrust F ₁ . While no current flows in the coil 5, the lens frame 3 moves to the side opposite to the subject side (toward the bottom 63 of the yoke 6) by the magnetic spring force F ₂ . Since the lens frame 3 is moving, the frictional force generated between the guide shaft 4 is equal to the frictional force F ₄ (b), and the lens also has a small magnetic spring force F ₂ that satisfies the above expression (6). The frame 3 can be brought into contact with the bottom portion 63 (reference plane D) of the yoke 6. After passing such an intermittent current for a certain time, the auto focus operation is performed to start recording the photographed image at the point of focus.

20 and 21, the energization direction to the coil 5 is not limited to the forward direction but may be reverse. In addition, instead of turning on / off the energization to the coil 5, you may change the direction of the electric current which flows through the coil 5 to a positive direction and a reverse direction.

As described above, according to the present embodiment, the lens frame 3 can be held without being separated from the reference position at the time of preview or photographing start. Since the magnetic spring force F ₂ can be suppressed small, the magnet 7 and the coil 5 can be made small, and as a result, the lens driving unit can be made smaller, and the imaging device 50 can be further made smaller.

Moreover, in each embodiment mentioned above, although the coil 5 was attached to the lens frame 3 and the magnet 7 was attached to the yoke 6, the magnet 7 was attached to the lens frame 3, The coil 5 may be attached to the yoke 6.

5 and 6 are not limited to the imaging device in which the yoke 6 is movable in the optical axis direction, and the yoke 6 is fixed to a fixed portion (for example, the housing 11 of the imaging device). You may apply to an imaging device.

In addition, in each of the above-described embodiments, a mobile device such as a mobile phone having an imaging function has been described as an example of an imaging device in which the imaging device is mounted. It is also possible to mount in imaging equipment, such as a still camera.

In addition, in each embodiment mentioned above, although the magnetic spring using the magnetic piece 8 was used in order to press the lens frame 3 to the solid-state image sensor 91 side, the object side or imaging of the lens frame 3 was carried out. A coil spring, a leaf spring, or the like may be provided on the element side to apply pressure to the lens frame 3. In the modification shown in FIG. 22, a pair of leaf springs 17 are provided on the subject side of the lens frame 3. This leaf spring 17 contacts the contact part which is not shown in the yoke 6 (FIG. 1 etc.), and presses the lens frame 3 to the imaging element side. Since the leaf spring 17 shown in FIG. 22 functions also as a power supply means to the coil 5, it is fixed by the solder 18 to the coil 5, but it is not limited to such a structure.

Claims (20)

A lens for photographing a subject, A lens frame holding the lens and having a guide hole formed in parallel with the optical axis direction of the lens; A fixing portion slidably coupled to the guide hole and having a guide shaft for guiding the lens frame in the optical axis direction; A coil fixed to the lens frame, A magnet facing the coil, Yoke attached to the magnet, And pressing means for bringing the lens frame into contact with the yoke in the optical axis direction, The yoke is movable in the optical axis direction with respect to the fixing part, and the position of the lens in the optical axis direction is adjusted by moving the yoke in the optical axis direction with respect to the fixing part. Lens drive device. The method of claim 1, The guide shaft and the yoke are screw-fit Lens drive device. The method of claim 1, The fixing portion has an eccentric pin for engaging with the yoke Lens drive device. The method according to any one of claims 1 to 3, The lens frame has a protrusion, The surface of the projection side of the subject side and the surface of the magnet opposite to the subject come into contact with each other to regulate movement of the lens frame toward the subject side. Lens drive device. The method according to any one of claims 1 to 3, A surface on the side opposite to the subject of the lens frame and a surface on the subject side of the yoke are contacted to regulate movement of the lens frame to the opposite side to the subject. Lens drive device. The method according to any one of claims 1 to 3, And a shutter mechanism portion for adjusting an amount of light incident on the lens, wherein the shutter mechanism portion is fixed to the yoke. Lens drive device. The method of claim 6. And a projection on the surface of the subject side of the shutter mechanism portion that protrudes more toward the subject than on the surface of the subject side. Lens drive device. The lens drive device according to any one of claims 1 to 3, And an imaging device for accommodating the subject image formed by the lens. Imaging device. The method of claim 8. At the start or when photographing starts, the lens frame is moved to a reference position in the optical axis direction by flowing a current through the coil. Imaging device. The method of claim 9, The reference position is a position where the lens frame is in contact with a reference plane defining a movement limit in the optical axis direction. Imaging device. The method of claim 8, At the start or when photographing is started, the lens frame is reciprocated in the optical axis direction by flowing a current through the coil. Imaging device. The imaging device of claim 8, And a housing for accommodating the imaging device. Imaging equipment. The method of claim 12, And a shutter mechanism portion fixed to the yoke for adjusting the amount of light incident on the lens, On the surface of the subject side of the shutter mechanism portion, a projection that projects toward the subject side rather than the surface of the subject side, The protrusion is in contact with the housing. Imaging equipment. A lens for photographing a subject, A lens frame holding the lens and having a guide hole formed in parallel with the optical axis direction of the lens; A fixing portion slidably coupled to the guide hole and having a guide shaft for guiding the lens frame in the optical axis direction; A coil fixed to the lens frame, A magnet facing the coil, A yoke to which the magnet is attached and movable in the optical axis direction, In the lens driving device having a pressing means for bringing the lens frame in contact with the yoke in the optical axis direction, The position in the optical axis direction of the lens is adjusted by adjusting the position in the optical axis direction with respect to the fixing portion of the yoke. How to adjust the lens position. A lens for photographing a subject, A lens frame holding the lens and having a guide hole formed in parallel with the optical axis direction of the lens; A guide shaft slidably coupled to the guide hole and guiding the lens frame in the optical axis direction; Pressing means for pressing the lens frame toward a reference position in the optical axis direction; Coils and magnets for generating a driving force for moving the lens frame in the optical axis direction, An imaging element for accommodating the subject image formed by the lens, The pressing force of the pressing means is less than the sum of the static frictional force between the guide shaft and the guide hole and the total weight of the lens frame and the parts fixed to the lens frame, and the dynamic friction force between the guide shaft and the guide hole Is greater than the sum of the total weight of the lens frame and the components fixed to the lens frame, At the time of startup or start of imaging, the lens is moved to a reference position in the optical axis direction by flowing a current through the coil. Imaging device. The method of claim 15, The reference position is a position in which the lens frame is in contact with a reference plane defining a movement limit in the optical axis direction. Imaging device. A lens for photographing a subject, A lens frame which holds the lens and is movable in the optical axis direction, Coils and magnets for generating a driving force for moving the lens frame in the optical axis direction, An imaging element for accommodating the subject image formed by the lens, At the start or when photographing is started, the lens is reciprocated in the optical axis direction by flowing a current through the coil. Imaging device. A lens for photographing a subject, A lens frame holding the lens and having a guide hole formed in parallel with the optical axis direction of the lens; A guide shaft slidably coupled to the guide hole and guiding the lens frame in the optical axis direction; Pressing means for pressing the lens frame toward a reference position in the optical axis direction; Coils and magnets for generating a driving force for moving the lens frame in the optical axis direction, An imaging element for accommodating the subject image formed by the lens, The pressing force of the pressing means is smaller than the sum of the static frictional force between the guide shaft and the guide hole and the total weight of the lens frame and the parts fixed to the lens frame, and the dynamic friction force between the guide shaft and the guide hole and In the imaging device larger than the sum of the total weight of the lens frame and the parts fixed to the lens frame, At the start or when photographing starts, the lens is moved to a reference position in the optical axis direction by flowing a current through the coil. How to drive a lens. The method of claim 18, The reference position is a position in which the lens frame is in contact with a reference plane defining a movement limit in the optical axis direction. How to drive a lens. A lens for photographing a subject, A lens frame which holds the lens and is movable in the optical axis direction, Coils and magnets for generating a driving force for moving the lens frame in the optical axis direction, In the imaging device provided with the imaging element which accommodates the subject image formed by the said lens, At the start or when photographing is started, the lens is reciprocated in the optical axis direction by flowing a current through the coil. How to drive a lens.

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