JP2006091207A - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive device having the function of properly guiding a lens in the direction of an optical axis and having the configuration that saves space and facilitates assembly. <P>SOLUTION: The lens drive device 1 includes: a lens moving body 2 for holding movable lenses 12, 13, and 14; a drive means 4 for moving the lens moving body 2 in the direction of an optical axis L; and a fixing body 3 for supporting the lens moving body 2 so that the lens moving body 2 is movable in the direction of the optical axis L. The drive means 4 includes a drive coil 5 disposed on the lens moving body 2, a drive magnet 6 and a plate-like york 8 which are disposed on the fixing body 3. The internal wall of the drive coil 5 has recesses 7d, as guide parts, extending in the direction of the optical axis, against which the peripheral surface of the drive magnet 6 slides and which is used to guide the lens moving body 2 in the direction of the optical axis. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lens driving device used for a relatively small camera such as a camera of a camera-equipped mobile phone.

  As a lens driving device for driving a lens such as a photographing lens of a camera in the optical axis direction, a lens moving body for holding the lens, a driving means for moving the lens moving body in the optical axis direction of the lens, and a lens moving body A lens driving device is used that includes a fixed body that is movably supported in the optical axis direction, and directly magnetically drives the lens.

  As this type of lens driving device, a lens using a so-called voice coil motor comprising a driving coil disposed on a lens moving body and a driving magnet and a yoke disposed on a fixed body as driving means for the lens moving body. A drive device is known (see, for example, Patent Documents 1 and 2).

  In the lens driving devices described in Patent Documents 1 and 2, a lens is held on the inner peripheral side of a lens moving body formed in a rectangular tube shape, and a driving coil is wound around the outer peripheral side. In addition, a yoke including an inner yoke and an outer yoke is fixed to the fixed body, and a drive magnet is fixed inside the outer yoke. The lens moving body is supported by the fixed body so as to be movable in the optical axis direction so that the driving coil wound around the lens moving body is disposed between the inner yoke and the driving magnet. A voice coil motor is configured as a body driving means.

Further, in the lens driving devices described in Patent Documents 1 and 2, in order to guide the lens moving body holding the lens in the optical axis direction, the fixed body has two guide shafts extending in the optical axis direction. The lens moving body is formed with a sliding hole through which the guide shaft is inserted and in sliding contact with the guide shaft.
JP-A-8-94904 Japanese Patent Laid-Open No. 5-264878

  However, since the lens driving device disclosed in the above-mentioned patent document employs a configuration in which two guide shafts are erected on the fixed body, the lens driving apparatus is dedicated as a guide for guiding the lens moving body in the optical axis direction. There is a problem that a member is required and the number of parts is increased. In addition, there is a problem that a dedicated space for arranging the two guide shafts is required and the apparatus is enlarged. Furthermore, in order to appropriately guide the lens moving body in the optical axis direction, the guide shaft needs to be erected with high accuracy with respect to the fixed body, and there is a problem that assembly work becomes difficult. In particular, since two guide shafts are used, if the parallelism between the guide shafts is not ensured, the lens moving body cannot be properly guided in the optical axis direction, and the assembly work becomes more difficult. There's a problem.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens driving device that has a function of appropriately guiding a lens in the optical axis direction, and has a configuration that facilitates space saving and assembly work.

  In order to solve the above-described problems, in the present invention, a lens moving body that holds a lens, a driving unit that moves the lens moving body in the optical axis direction of the lens, and a lens moving body that moves in the optical axis direction In the lens driving device including a fixed body that supports the driving body, the driving means includes a driving coil disposed on the fixed body and a driving magnet disposed on the lens moving body, and the driving coil. The coil bobbin is wound with a guide portion that extends in the optical axis direction so that the lens moving body slides and guides the lens moving body in the optical axis direction. It is characterized by that.

  In the present invention, it is preferable that the guide portion is provided at a plurality of locations separated in the circumferential direction around the optical axis of the lens. If comprised in this way, the dimensional accuracy of a guide part can be ensured easily compared with the case where a guide part is provided in a perimeter.

  Furthermore, in the present invention, it is preferable that the lens moving body is disposed in the coil bobbin so as to overlap with the cylindrically formed coil bobbin, and the inner wall of the coil bobbin is used as the guide portion. If comprised in this way, since a guide part can be combined with the inner wall of a coil bobbin, the special member for comprising a guide part becomes unnecessary. Therefore, the apparatus can be reduced in size by saving space. Further, if the coil bobbin is integrally formed of resin, the molding accuracy can ensure the dimensional accuracy of the inner wall of the coil bobbin, and the lens moving body can be guided appropriately in the optical axis direction.

  Furthermore, it is preferable that the drive magnet is slid on the guide portion. If comprised in this way, since the magnet surface is generally harder than resin, its abrasion resistance is large. Therefore, by sliding the drive magnet, at least the generation of wear powder from the drive magnet is suppressed, so that the lens surface can be kept clean for a long time.

  Further, it is preferable that the lens moving body has a holding portion for holding the drive magnet, and the holding portion is slid on the guide portion. If comprised in this way, if it is a case where a holding | maintenance part is shape | molded with resin, the dimensional accuracy of a holding | maintenance part can be ensured with the shaping | molding precision.

  In the present invention, it is preferable that a lubricating coating is formed on at least one surface of the guide portion and the sliding portion of the lens moving body that slides with the guide portion. In this case, the sliding resistance between the sliding portion and the coil bobbin sliding with the sliding portion is reduced, and the power consumption during the movement of the lens moving body can be reduced. Further, the movement of the lens moving body in the optical axis direction is performed smoothly.

  In the present invention, the lens moving body or the fixed body provided with the drive coil includes a magnetic piece, and the movable range end position of the lens moving body is obtained by a magnetic attractive force between the magnetic piece and the drive magnet. It is preferable to hold the lens moving body. In this case, by setting the movable range end position of the lens moving body as a position where photographing is performed, that is, a lens holding position, the driving coil does not need to be energized at the holding position, and the lens holding position is maintained. Power consumption in the state can be reduced.

  As described above, the coil bobbin of the present invention includes the guide portion extending in the optical axis direction for sliding the lens moving body and guiding the lens moving body in the optical axis direction. Therefore, since the guide part can be used also as the coil bobbin, a special member for constituting the guide part becomes unnecessary. Therefore, the space can be saved and the apparatus can be downsized. Moreover, since the coil bobbins are connected in the circumferential direction, they can be handled as one member, so that the assembly work can be easily performed.

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

(Configuration of lens driving device)
FIG. 1 is a side sectional view showing a lens driving device according to an embodiment of the present invention. 2A and 2B show a state where a cover is removed from the lens driving device shown in FIG. 1, FIG. 2A is a top view thereof, and FIG. 2B is a cross-sectional view taken along a line AA in FIG. 3A and 3B show a fixed side member excluding the cover of the lens driving device shown in FIG. 1, FIG. 3A is a top view thereof, and FIG. 3B is a cross-sectional view taken along line BB in FIG. 4A and 4B show a fixed body of the lens driving device shown in FIG. 1, in which FIG. 4A is a top view thereof, and FIG. 5A and 5B show the yoke of the lens driving device shown in FIG. 1, wherein FIG. 5A is a top view excluding the cap yoke, FIG. 5B is a cross-sectional view taken along the line DD in FIG. It is. 6 shows a coil bobbin around which the drive coil of the lens driving device shown in FIG. 1 is wound. FIG. 6A is a top view thereof, and FIG. 6B is a cross-sectional view taken along line EE of FIG. 7 shows a lens moving body of the lens driving device shown in FIG. 1, (A) is a top view thereof, and (B) is a cross-sectional view taken along the line FF of (A).

  The lens driving device 1 according to this embodiment is applied to a thin camera mounted on a portable device such as a mobile phone, and includes a lens moving body 2 that holds moving lenses 12, 13, and 14, and this lens movement. A driving unit 4 that moves the body 2 in the optical axis L direction of the moving lenses 12, 13, and 14 and a fixed body 3 that supports the lens moving body 2 so as to be movable in the optical axis L direction are provided. In the present embodiment, the driving means 4 includes a driving coil 5, a driving magnet 6, and a yoke 8 that forms a magnetic circuit together with the driving coil 5 and the driving magnet 6. A cover 10 is fixed to the upper end side of the lens driving device 1 in the figure.

  As shown in FIGS. 1 to 3, the fixed body 3 is provided with a coil bobbin 7 and a yoke 8 around which a drive coil 5 is wound.

  As shown in FIG. 4, the fixed body 3 in this embodiment is a resin member formed in a ring shape, and an opening 3 a for capturing an image of the subject to be photographed is formed at the center. The surface is formed in a state in which a restricting portion 3c for restricting a movable range below the lens moving body 2 in the optical axis L direction and a recess 3d as a yoke fixing portion for fixing the yoke 8 are recessed from the restricting portion 3c. Yes. The recesses 3d are formed at three positions with a 120 ° pitch centered on the optical axis L.

  Furthermore, supply portions 3e for supplying an adhesive to the gap between the yoke 8 and the recess 3d in a state where the yoke 8 is fixed are formed at two locations in the circumferential direction in the recess 3d. The supply part 3e is also formed in a state of being recessed from the restricting part 3c, like the recess 3d. The concave portion 3d is in a state in which the flatness of the bottom surface is ensured with high accuracy in order to fix the yoke 8 with high accuracy.

  Further, the restricting portion 3c is formed on a coil bobbin 7 around which the drive coil 5 is wound between the adjacent recesses 3d among the recesses 3d formed at three locations, and the coil bobbin 7 is positioned and fixed later. An engagement hole 3b with which the protrusion 7c is engaged, and a lead-out hole 3f for pulling out the end of the drive coil to the outside of the fixed body 3 are formed. The extraction hole 3f is formed so as to open to the outside of the fixed body 3 while being recessed from the restricting portion 3c.

  As shown in FIG. 5, the yoke 8 is formed of a plate-like magnetic member, and has an outer yoke 8 b that is formed in a cylindrical shape in the circumferential direction and an inner yoke that is formed inside the outer yoke 8 b in the radial direction. 8a, a lower yoke constituted by a connecting portion 8c for connecting the outer yoke 8b and the inner yoke 8a, and a cap yoke 8d disposed across the upper ends in the drawing of the inner yoke 8a and the outer yoke 8b. It is configured. Specifically, in the lower yoke, the connecting portion 8c connects the inner yoke 8a and the outer yoke 8b at the lower end in the figure, and the inner yoke 8a and the outer yoke 8b stand vertically from the connecting portion 8c. Is formed. The illustrated lower surface of the connecting portion 8 c is a fixed reference surface 8 e for fixing the yoke 8 to the fixed body 3. In this embodiment, the lower yoke is formed by bending a thin plate-like magnetic member with a press, and the perpendicularity of the inner yoke 8a and the outer yoke 8b with respect to the fixed reference surface 8e is ensured with high accuracy. The cap yoke 8d is bonded or the like in a state where the notches 8f formed at two opposed positions engage with the protrusions 8g formed at the upper ends of the inner yoke 8a and the outer yoke 8b in the figure. It is fixed by. An effective magnetic path is formed by the cap yoke 8d, and the driving efficiency of the driving means 4 can be increased. The inner yoke 8a is formed in a substantially arc shape with the optical axis L as the center, as shown in FIG. Similarly, the outer yoke 8b is formed in a substantially cylindrical shape centered on the optical axis L.

  The coil bobbin 7 is a resin member. As shown in FIG. 6, the coil bobbin 7 is formed in a cylindrical shape having flanges 7a and 7b on the upper and lower ends in the figure, and the inner wall has three engagement recesses 7d and It is formed in the uneven | corrugated shape which consists of the three convex parts 7e. The engaging recesses 7d are formed at three positions with a pitch of about 120 ° around the optical axis L. In this embodiment, the bottom surface of the engaging recess 7d is guided by a drive magnet 6 described later to move the lens. It is a guide part for guiding the body 2 in the optical axis L direction. That is, the outer peripheral surface of the drive magnet 6 is configured to slide with the bottom surface of the engaging recess 7d as a sliding portion. Note that a lubricating coating may be formed on the surface of the engaging recess 7d in order to reduce sliding resistance with the drive magnet 6. Specifically, an electroless nickel plating film in which polytetrafluoroethylene (PTFE) is dispersed may be formed on the surface of the recess 7d. In this case, it is necessary to form the coil bobbin 7 with a heat resistant resin such as a liquid crystal resin or a polyphenylene sulfide resin (PPS). Of course, a lubricating coating may be formed on the outer peripheral surface of the drive magnet 6.

  The coil bobbin 7 is formed with a magnetic piece holding portion 7f for holding the chip-like magnetic piece 9 at a substantially central position in the circumferential direction on the lower end side of the engaging recess 7d in the figure.

  In the case of this embodiment, the yoke 8 is fixed to the recess 3 d formed in the fixed body 3. More specifically, in a state where the fixed reference surface 8e is in contact with the bottom of the recess 3d, both ends in the circumferential direction of the connecting portion 8c and the corners where the inner yoke 8a is bent are the walls of the recess 3d. The yoke 8 is fixed to the recess 3d in a state of being fitted to the portion. Thus, in the state where the yoke 8 is fixed to the fixed body 3, the inner yoke 8a and the outer yoke 8b extend in the optical axis L direction. The inner yoke 8a is erected on the fixed body 3 at equal intervals of approximately 120 ° with the optical axis L as the center.

  As shown in FIG. 7, the lens moving body 2 includes a holding portion 21 formed in a cylindrical shape with resin, moving lenses 12, 13 and 14 (not shown) held on the inner peripheral side thereof, and an outer peripheral side thereof. And the three drive magnets 6 held in FIG. The holding portion 21 and the drive magnet 6 are integrally formed by insert molding, and the drive magnet 6 is formed so as to protrude outward in the radial direction from the holding portion 21. Therefore, the outer periphery of the lens moving body 2 is formed in an uneven shape. In this embodiment, the lens moving body 2 directly holds the moving lenses 12, 13 and 14 on the inner peripheral side thereof, but holds the moving lenses 13 and 14 via the lens barrel. Also good.

  In the lens moving body 2, through holes 2b through which the inner yoke 8a is inserted are formed at three positions corresponding to the inner yoke 8a at a pitch of about 120 ° around the optical axis L. As shown in FIG. 7A, the through-hole 2b is formed in a substantially arc shape, and is formed so as to penetrate the lens moving body 2 in the optical axis L direction. The radial width of the through hole 2b is formed larger than the radial thickness of the inner yoke 8a, and the radial direction between the through hole 2b and the inner yoke 8a in a state where the inner yoke 8a is inserted into the through hole 2b. The gap is formed in such a size that the lens moving body 2 does not come into contact when moving in the direction of the optical axis L. That is, it is formed in a size that does not prevent sliding between the drive magnet 6 and the engaging recess 7d.

  As shown in FIG. 7A, the drive magnet 6 is a thin plate-like permanent magnet whose cross section in the optical axis L direction is formed in a substantially arc shape and extends in the optical axis L direction. Each side is magnetized to a single pole. For example, the inner peripheral side of the drive magnet 6 is magnetized to the N pole, and the outer peripheral side is magnetized to the S pole. In this embodiment, the three drive magnets 6 are fixed to the outer peripheral surface of the lens moving body 2 by fixing means such as adhesion.

  The lens moving body 2 in which the drive magnet 6 is fixed to the outer peripheral side is arranged inside the cylindrical portion of the coil bobbin 2 with the inner yoke 8a inserted through the through hole 2b. At this time, the drive magnet 6 is positioned in the circumferential direction by engaging with the engaging recess 7d. Therefore, the inner yoke 8a and the through hole 2b have a clearance that does not hinder this positioning in the circumferential direction. Positioning in the circumferential direction may be performed by the inner yoke 8a and the through hole 2b instead of by the drive magnet 6 and the engaging recess 7d. At this time, the drive magnet and the engaging recess 7d are formed in a clearance that does not hinder their positioning in the circumferential direction. Further, the drive magnet 6 is disposed so as to be sandwiched in the radial direction by the drive coil 5 and the inner yoke 8a, and the voice coil as the drive means 4 is formed from the drive coil 5, the drive magnet 6 and the yoke 8. A motor is configured.

  When the lens moving body 2 is disposed inside the cylindrical portion of the coil bobbin 2, each magnetic piece 9 is opposed to the lower end side in the optical axis L direction of the outer wall of the drive magnet 6. Further, when the lens driving device 1 is viewed from above, each magnetic piece 9 is arranged at the center position in the circumferential direction of the driving magnet 6.

  The cover 10 is a resin member formed in a ring shape with an opening formed in the center, and is formed so that the outer diameter substantially coincides with the fixed body 3. Further, on the lower side of the cover 10 in the figure, a restricting portion (not shown) that restricts the movable range of the lens moving body 2 in the upward direction in the optical axis L direction is formed.

(Operation of lens driving device)
The operation of the lens driving device 1 configured as described above will be described below.

  In this embodiment, as shown in FIG. 1, the state where the bottom surface of the lens moving body 2 is in contact with the restricting portion 3c of the fixed body 3 is the normal moving lens holding position. In this state, the lens moving body 2 is stably held in the direction of the optical axis L by the magnetic attractive force between the magnetic piece 9 and the drive magnet 6. Therefore, the drive coil 5 is in a non-energized state at the normal moving lens holding position. Further, since each magnetic piece 9 is arranged at the center position in the circumferential direction of the drive magnet 6, the lens moving body 2 is stably held also in the circumferential direction.

  When a current is supplied to the drive coil 5 so that the lens moving body 2 moves in the upward direction in the figure while the lens moving body 2 is held at a normal moving lens holding position, the lens moving body 2 6 is guided in the direction of the optical axis L by the engaging recess 7d, and a focusing operation is performed in which the upper end of the lens moving body 2 moves up to abut against a regulating portion formed on the cover 10. The lens moving body 2 that has moved from the normal moving lens holding position to a predetermined position in the optical axis L direction by this focusing operation is balanced with the magnetic attraction force between the magnetic piece 9 and the drive magnet 6. Is kept stable at a predetermined position. In addition, since each magnetic piece 9 is arrange | positioned in the center position of the circumferential direction of the drive magnet 6, the lens moving body 2 has the magnetic piece 9, the drive magnet 6, and the circumferential direction. Is stably held by.

  When current is supplied to the drive coil 5 so that the lens moving body 2 moves in the downward direction in the figure at the predetermined position, the lens moving body 2 is moved in the direction of the optical axis L by the engaging recess 7d. Move as guided. For example, the lens moving body 2 moves until the bottom surface of the lens moving body 2 comes into contact with the restricting portion 3c of the fixed body 3, and is held at a normal moving lens holding position. Note that, depending on the magnitude of the magnetic attractive force generated between the magnetic piece 9 and the drive magnet 6, the lens moving body 2 can be moved in a normal state by turning off the drive coil 5 at the predetermined position. It is also possible to move to the moving lens holding position.

(Main effects of this form)
As described above, in the lens driving device 1 of the present embodiment, the coil bin 7 slides with the lens moving body 2 and extends in the optical axis direction for guiding the lens moving body 2 in the optical axis direction. A recess 7d as a part is provided. Therefore, since the recessed portion 7d can be used also as the coil bobbin 7, a special member for configuring the recessed portion 7d is not necessary. That is, it is not necessary to separately provide a guide shaft for guiding the lens moving body 2 in the optical axis L direction. Therefore, the configuration of the lens driving device 1 is simplified, the device can be miniaturized, and can be applied to a thin camera mounted on a portable device such as a cellular phone. In particular, the lens moving body 2 of this embodiment is disposed in the coil bobbin 7 so as to overlap with the cylindrical coil bobbin 7 in the radial direction, and a concave portion 7d is formed on the inner wall of the coil bobbin 7 integrally formed of resin. ing. Therefore, it becomes possible to ensure the dimensional accuracy of the inner wall of the coil bobbin by the molding accuracy when the coil bobbin 7 is molded from resin, and the lens moving body 7 can be appropriately guided in the optical axis direction.

  Further, in this embodiment, the concave portions 7d as the guide portions are provided at three locations separated in the circumferential direction around the optical axes of the lenses 12, 13, and 14. Therefore, since the dimensional accuracy of the guide portion is only required at the three concave portions 7d, it is easy to ensure the dimensional accuracy as compared with the case where the guide portion is provided on the entire circumference. In particular, in this embodiment, since the three concave portions 7d are provided at equal angular intervals with the optical axis L as the center, when the lens moving body 2 is guided in the direction of the optical axis L, the lens moving body 2 is provided. Inclination is less likely to occur, and the lens moving body 2 can be reliably guided. Further, the inclination of the lens moving body 2 can be suppressed, and the lens moving body 2 can be appropriately guided in the direction of the optical axis L.

  Further, in the present embodiment, the bottom surface of the engaging recess 7d is a guide portion 7d for guiding the lens moving body 2 in the optical axis L direction while the outer peripheral surface of the drive magnet 6 is guided. Accordingly, since the magnet surface is generally harder than the resin, the wear resistance is large. By sliding the drive magnet 6, at least the generation of wear powder from the drive magnet 6 is suppressed, and the lens surface is reduced. Can be kept clean for a long time.

  In this embodiment, a lubricating coating can be formed on at least one of the bottom surface of the recess 7d as the guide portion and the outer peripheral surface of the drive magnet 6, and when the lubricating coating is formed, sliding is possible. Resistance can be reduced. As a result, power consumption during movement of the lens moving body 2 can be reduced, and the movement of the lens moving body 2 in the direction of the optical axis L is smoothly performed.

  In this embodiment, the lens moving body 2 includes a magnetic piece 9 and is held by a normal moving lens that is the end position of the movable range of the lens moving body 2 in the downward direction by the magnetic attractive force of the magnetic piece 9 and the drive magnet 6. At the position, the lens moving body 2 is stably held in the optical axis L direction. Therefore, it is not necessary to keep the drive coil 5 energized at the normal moving lens holding position, and it is only necessary to energize the drive coil 5 only during the focusing operation. Therefore, the power consumption in the holding state of the moving lenses 12, 13, and 14 can be reduced.

  In this embodiment, in a state where the lens moving body 2 is disposed inside the cylindrical portion of the fixed body 3, each magnetic piece 9 is disposed at the center position in the circumferential direction of the drive magnet 6. ing. Therefore, the magnetic piece 9 is attracted to the center position in the circumferential direction of the drive magnet 6 having a high magnetic flux density, and the lens moving body 2 can be stably held in the circumferential direction.

Further, when the lens moving body 2 moves, even if the lens moving body 2 swings in the circumferential direction, a restoring force acts so that each magnetic piece 9 is arranged at the center position in the circumferential direction of the drive magnet 6. . Therefore, the optical characteristics of the lens group composed of the moving lenses 12, 13, and 14 do not vary. As a result, the lens driving device 1 with stable optical characteristics can be provided.
(Other embodiments)

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the embodiment described above, the outer peripheral surface of the drive magnet 6 is used as a sliding portion and is slid on the bottom surface of the engaging recess 7d as a guide portion. You may comprise so that the surface may be made to slide on the top part of the convex part 7e as a sliding part. If comprised in this way, if the holding | maintenance part 21 is integrally molded with resin, for example, the dimensional accuracy of a holding | maintenance part can be ensured with the shaping | molding precision. In this case, the top part of the convex part 7e becomes a guide part. In addition, you may form the above-mentioned lubricous film | membrane in at least one of the top part of the convex part 7e, or the outer peripheral side surface of the holding | maintenance part 21. FIG.

  In the embodiment described above, the drive magnet 6 protrudes outward in the radial direction from the holding portion 21. However, the magnet holding portion 21 may be protruded, or the outer periphery of the drive magnet and the outer periphery of the holding portion 21. May be configured to have the same concentric circle, and the outer circumferences may be matched.

  The drive magnet may be a permanent magnet integrally formed in a ring shape.

  Furthermore, in the form mentioned above, although the recessed part 7d was formed in three places in the circumferential direction, a guide part is not limited to three places, You may form in two places or may form in four or more places.

  Furthermore, in the above-described embodiment, the coil-shaped bobbin 7 is provided with the chip-like magnetic piece 9 at the substantially central position in the circumferential direction on the lower end side of the engaging recess 7d. This position may be any position as long as the lens moving body 2 can be stably held in the optical axis L direction at the moving lens holding position.

It is side surface sectional drawing which shows the lens drive device concerning embodiment of this invention. FIGS. 2A and 2B show a state where a cover is removed from the lens driving device shown in FIG. 1, and FIG. 2A is a top view thereof, and FIG. The fixed side member except the cover of the lens drive device shown in FIG. 1 is shown, (A) is its top view, and (B) is a sectional view in the BB cross section of (A). The fixed body of the lens drive device shown in FIG. 1 is shown, (A) is the top view, (B) is sectional drawing in CC cross section of (A). 1A and 1B show a yoke of the lens driving device shown in FIG. 1, wherein FIG. 1A is a top view excluding a cap yoke, FIG. 1B is a cross-sectional view taken along a line DD in FIG. 1A, and FIG. The coil bobbin around which the drive coil of the lens drive device shown in FIG. 1 is wound is shown, (A) is a top view thereof, and (B) is a cross-sectional view taken along the line EE of (A). The lens moving body of the lens drive device shown in FIG. 1 is shown, (A) is a top view thereof, and (B) is a sectional view taken along the line FF of (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Lens moving body 2b Through-hole 7 Coil bobbin 7d Engagement recessed part (guide part)
7f Magnetic piece holding portion 3 Fixed body 4 Driving means 5 Driving coil 6 Driving magnet 8 Yoke 8a Inner yoke 8b Outer yoke 8c Connecting portion 8d Cap yoke 9 Magnetic pieces 12, 13, 14 Moving lens 21 Holding portion L Optical axis 0

Claims (7)

A lens driving device comprising: a lens moving body that holds a lens; a driving unit that moves the lens moving body in the optical axis direction of the lens; and a fixed body that supports the lens moving body so as to be movable in the optical axis direction. In
The drive means includes a drive coil disposed on the fixed body and a drive magnet disposed on the lens moving body,
The coil bobbin around which the drive coil is wound is connected in the circumferential direction and the lens moving body slides to extend in the optical axis direction for guiding the lens moving body in the optical axis direction. A lens driving device comprising a portion.   The lens driving device according to claim 1, wherein the guide portion is provided at a plurality of locations separated in a circumferential direction around the optical axis of the lens.   3. The lens moving body according to claim 1, wherein the lens moving body is disposed in the coil bobbin so as to overlap with the cylindrically formed coil bobbin in a radial direction, and an inner wall of the coil bobbin is used as the guide portion. Lens drive device.   4. The lens driving device according to claim 3, wherein the driving magnet is slid on the guide portion.   4. The lens driving device according to claim 3, wherein the lens moving body has a holding portion for holding the drive magnet, and the holding portion is slid on the guide portion.   6. The lubricating film according to claim 1, wherein a lubricating coating is formed on at least one surface of the guide portion and the sliding portion of the lens moving body that slides with the guide portion. A lens driving device. The fixed body includes a magnetic piece, and the lens moving body is held at a movable range end position of the lens moving body by a magnetic attractive force between the magnetic piece and the driving magnet. Or the lens drive device of 2.

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