JP2008197313A - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens driving device capable of securing the diameter of a lens held in a device main body while preventing the dimension in the radial direction of the device main body from getting larger. <P>SOLUTION: The lens driving device is equipped with: a lens holder 6 holding a lens; and a lens driving part having a magnet 11, a coil 10 and a yoke 12 and moving the lens holder 6 in an optical axis direction. A plurality of notched parts 12c are formed at a part of the yoke 12 arranged around the lens holder 6, while a part of the lens holder 6 is received by the notched parts 12c. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens driving device, and more particularly to a lens driving device suitable for an autofocus function and a camera shake correction function in a digital camera.

2. Description of the Related Art Conventionally, a lens driving device mounted on a digital camera or a camera-equipped mobile phone has been proposed that controls the position of a lens group using a voice coil motor (see, for example, Patent Document 1). On the other hand, in recent years, digital cameras and camera-equipped mobile phones have been miniaturized, and accordingly, lens drive devices used in camera modules are also required to be miniaturized.
JP-A-8-94904

  However, in the above-described conventional lens driving device, since the component parts are arranged in parallel along the radial direction of the lens, there is a problem that the radial dimension of the device main body increases. When attempting to reduce the radial dimension of the apparatus main body, another problem arises that it is difficult to ensure the diameter of the lens.

  The present invention has been made in view of such problems, and provides a lens driving device capable of ensuring the diameter of a lens held in the apparatus main body while preventing an increase in the radial dimension of the apparatus main body. The purpose is to provide.

  The lens driving device of the present invention includes a lens holder that holds a lens, and a lens driving unit that includes a magnet, a coil, and a yoke and moves the lens holder along the optical axis direction. A plurality of notches are formed in a part of the arranged yoke, and a part of the lens holder is received by the notches.

  According to the lens driving device, since the lens holder is partially received by the plurality of notches formed in the yoke disposed around the lens holder, the radial dimension of the device main body is maintained. On the other hand, a space for holding the lens in the lens holder can be secured. Thereby, it is possible to ensure the diameter of the lens held by the apparatus main body while preventing the radial dimension of the apparatus main body from increasing.

  In the lens driving device, it is preferable that the magnet disposed in the yoke is formed in an annular shape and a thick portion is provided at a position corresponding to a non-formed portion of the notch in the yoke of the magnet. . In this case, since the thick part of the magnet is arranged at a position corresponding to the non-formed part of the notch of the yoke, the magnetic force in the non-formed part of the notch of the yoke can be increased. It is possible to prevent the driving force for the lens in the main body from being reduced.

  In particular, in the lens driving device, it is preferable that the thick portion of the magnet is disposed at a position corresponding to the corner portion of the base member of the device body having a rectangular shape. In this case, since the thick part of the magnet is disposed at a position corresponding to the corner of the base member of the apparatus main body, the outer dimension of the apparatus main body is increased by effectively utilizing the space near the corner of the base member. It is possible to form the thick portion without doing so.

  In the lens driving device, a cover member may be disposed at a position corresponding to the notch in the yoke. In this case, since the notch portion of the yoke is covered with the cover member, it is possible to prevent dust and the like from entering the apparatus main body through the notch portion.

  According to the present invention, the elastic connection for electrically connecting the contact portion of the coil of the lens driving portion and the contact portion of the substrate to the through hole formed in the base member having the storage portion for storing the image sensor on the substrate. Since the member is disposed, it is not necessary to provide a space for electrically connecting the lens driving device and the substrate in the apparatus, so that the apparatus main body can be reduced in size and the electrical components between the components in the apparatus can be electrically connected. A connection path can be secured.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view of a lens driving device according to an embodiment of the present invention. As shown in FIG. 1, a lens driving device 1 according to the present embodiment includes a substrate 3 on which an image sensor 2 is mounted and a base member (hereinafter simply referred to as “base”) 5 on which an IR cut filter 4 is mounted. The lens holder 6 is attached, the case 8 to which the lens case 7 is attached via the lens holder 6, the cover 9 that covers the case 8 from above the attached lens holder 6, and the lens holder 6. Coil 10, magnet 11 and yoke 12 disposed above lens holder 6, and cover film 13 attached to yoke 12.

  As shown in FIG. 1, the substrate 3 is provided in a square shape when viewed from above. A plurality of external connection members 3 a for connecting to the outside are provided on the side surfaces of each side of the substrate 3. A pair of contact portions 3b are provided in the vicinity of the external connection member 3a provided on the side surface of one specific side. The image sensor 2 is fixed by wire bonding so that the imaging region 2 a is disposed at the center position of the substrate 3. In FIG. 1, only terminal portions for fixing the image sensor 2 to the substrate 3 are shown, and the wires themselves are omitted.

  The base 5 is composed of a plate-like member having a square shape corresponding to the substrate 3. Near the center of the base 5, an opening 5a having a rectangular shape is formed at a position corresponding to the imaging region 2a, and a concave portion 5b having a circular shape is formed around the opening 5a. The IR cut filter 4 has a circular shape corresponding to the recess 5b and is attached to the recess 5b. At the four corners of the base 5, convex portions 5c that slightly protrude upward are formed. Protruding pieces 5d protruding upward are formed in the vicinity of these convex portions 5c. A pair of through holes 5 e are formed at positions corresponding to the contact portions 3 b formed on the substrate 3 in the base 5. In the through hole 5e, a spring 5f that electrically connects contact portions 62e and 64e of the lens holder 6 to be described later and the contact portion 3b of the substrate 3 is disposed. The spring 5f is made of a conductive material such as metal and has elasticity.

  The case 8 generally has a square shape corresponding to the substrate 3 and the base 5, and a circular opening 8a is formed at the center thereof. Further, the lens drive device 1 includes side surface portions 8b and 8c that constitute a part of the side surface. The side surface portion 8b has a shape for receiving a leg portion 12b of a yoke 12 to be described later in the vicinity of the end portion, and has a shape for receiving a protruding piece 5d of the base 5 at its inner portion. A concave portion 8d for receiving contact portions 62e and 64e of the lens holder 6 described later is formed on the lower surface of the central portion of the side surface portion 8b. On the other hand, a groove 8e that accommodates a part of a leaf spring of the lens holder 6 described later is formed on the side surface 8c. Furthermore, pins 8 f projecting upward are provided at the four corners of the case 8.

  The lens case 7 has a small diameter portion 7a and a large diameter portion 7b, and holds a plurality of lenses along the optical axis direction in a space formed therein. An opening 7c that functions as a light entrance is formed on the upper surface of the small diameter portion 7a. Moreover, the thread 7d is formed in the surrounding surface of the large diameter part 7b. The thread 7d engages with a thread formed on the inner peripheral surface of the lens holder 6 described later, and is used when adjusting the position of the lens case 7 itself.

  The lens holder 6 is configured by combining a plurality of components. In a state where a plurality of parts are combined, the lens case 7 is held in a space formed therein so that the position of the lens case 7 can be adjusted vertically. The lens holder 6 is configured such that the end of a leaf spring, which is a component, is fixed to the case 8, and the central portion thereof can swing up and down with respect to the case 8. A coil 10 having an annular shape is fixed on the upper surface of the lens holder 6. For example, the coil 10 is bonded and fixed to the upper surface of the lens holder 6. The detailed configuration of the lens holder 6 will be described later.

  The cover 9 has a shape corresponding to the upper surface of the case 8, and a circular opening 9a is formed at the center thereof. Moreover, it has a pair of edge | side 9b corresponding to the side part 8b of case 8, and a pair of edge | side 9c corresponding to the side part 8c. The side 9b has a shape for receiving a leg portion 12b of a yoke 12 described later in the vicinity of the end portion, and has a shape for receiving a protruding piece 5d of the base 5 at an inner portion thereof, similarly to the side surface portion 8b of the case 8. Yes. In addition, at the four corners of the cover 9, holes 9d through which the pins 8i of the case 8 pass are formed.

  The magnet 11 has an annular shape larger in diameter than the coil 10 and is fixed to the inner wall surface of the yoke 12. In a state of being fixed to the yoke 12, it is disposed so as to surround the periphery of the coil 10 fixed to the upper surface of the lens holder 6. The inner peripheral surface of the magnet 11 faces the outer peripheral surface of the coil 10 in a state where the magnet 11 is separated by a certain distance. Note that the length of the magnet 11 in the optical axis direction is configured to be longer than the length of the coil 10 in order to correspond to the vertical movement of the coil 10.

  The yoke 12 functions as a magnetic body, and has an annular shape that has a shape opened to the lower side shown in FIG. Moreover, it is being fixed to the bracket 12a in the lower end part. The bracket 12a is bent downward at its four corners, and the bent portion constitutes a leg portion 12b. On the upper side of the inner peripheral surface of the yoke 12, a plurality of notches 12c are formed. The notch 12c has a shape for receiving a protruding piece 61c of the lens holder 6 described later. The cover film 13 has an annular shape, is affixed to the upper surface of the yoke 12, and plays a role of preventing dust and the like from entering from the notch 12c.

  Here, the state at the time of assembling the lens drive device 1 which concerns on this Embodiment is demonstrated. FIG. 2 is a perspective view when the lens driving device 1 according to the present embodiment is assembled. FIG. 3 is a cross-sectional view when the lens driving device 1 according to the present embodiment is assembled. In FIG. 3, the lens held in the lens case 7 is omitted.

  In the assembled state of the lens driving device 1, the case 8 and the cover 9 are overlaid on the base 5 as shown in FIGS. 2 and 3. At this time, as shown in FIG. 2, the side portion 8 b of the case 8 and the center portion of the side 9 b of the cover 9 are accommodated between the protruding pieces 5 d of the base 5. Thereby, the case 8 and the cover 9 are positioned on the base 5.

  Further, as shown in FIGS. 2 and 3, the yoke 12 is overlaid on the cover 9. At this time, as shown in FIG. 2, the leg portion 12 b of the yoke 12 is disposed so as to cover the surface of the side surface portion 8 b of the case 8 and the side 9 b of the cover 9 that are overlapped. And the lower end part of the leg part 12b is arrange | positioned inside the convex part 5c of the base 5. FIG. In this manner, the yoke 12 is positioned by being sandwiched between the side surface portion 8b of the case 8 and the side 9b of the cover 9 and the convex portion 5c.

  The yoke 12 has a substantially U-shaped cross section, and in the inside, the magnet 11 is bonded and fixed to the outer inner wall surface. A coil 10 fixed to the lens holder 6 is disposed between the inner peripheral surface of the magnet 11 and the inner wall surface inside the yoke 12. The coil 10 is disposed at a position separated from the inner peripheral surface of the magnet 11 and the inner wall surface inside the yoke 12 by a certain distance.

  The coil 10, the magnet 11, and the yoke 12 constitute a lens driving unit that moves the lens holder 6 and the lens case 7. In the present embodiment, the lens driving unit is configured by a so-called voice coil motor. In particular, the present embodiment shows a case where a moving coil type voice coil motor that moves the coil 10 along the magnet 11 by energizing the coil 10 is applied.

  Further, as shown in FIG. 3, a lens case 7 is disposed inside the yoke 12. An IR cut filter 4 is disposed at a lower position corresponding to the plurality of lenses held by the lens case 7, and an imaging region 2 a of the image sensor 2 is disposed at a lower position of the IR cut filter 4.

  The lens driving device 1 according to the present embodiment has such a configuration, and drives the lens held by moving the lens case 7 up and down. Hereinafter, in the lens driving device 1 according to the present embodiment, an operation when the lens case 7 is moved up and down will be described.

  In the lens driving device 1 according to the present embodiment, when the lens case 7 is moved up and down, for example, the coil 10 according to a driving instruction from a control unit of a mobile phone or digital camera in which the lens driving device 1 is mounted. A current is passed through. At this time, in the lens driving device 1, the plate springs (first and second plate springs) of the lens holder 6 are used as the energizing means. Specifically, current is sent from the contact portion 3 b of the substrate 3 to the coil 10 through the spring 5 f and the first leaf spring embedded in the base 5. Then, the current flowing through the coil 10 is sent out to the substrate 3 through the second leaf spring 64 and the spring 5 f embedded in the base 5.

  When a current flows through the coil 10 in this way, a current that flows through the coil 10 acts on a magnetic field generated from the magnet 11, thereby generating a thrust that moves the coil 10 in the vertical direction. In the lens driving device 1 according to the present embodiment, this thrust is controlled by controlling the amount of current flowing through the coil 10, the coil 10 is moved up and down, and the positioning is performed. As a result, the lens holder 6 to which the coil 10 is fixed can be positioned, and the lens in the lens case 7 attached to the lens holder 6 can be positioned.

  Hereinafter, components having the characteristics of the lens driving device 1 according to the present embodiment will be described. Since the lens driving device 1 according to the present embodiment is characterized by the configuration of the lens holder 6, the magnet 11, and the yoke 12, these configurations will be described below.

  First, the configuration of the lens holder 6 included in the lens driving device 1 according to the present embodiment will be described. FIG. 4 is an exploded perspective view for explaining the lens holder 6 included in the lens driving device 1 according to the present embodiment. FIG. 5 illustrates the lens holder 6 included in the lens driving device 1 according to the present embodiment. It is a perspective view at the time of an assembly. In FIG. 4, for convenience of explanation, a case 8 and a cover 9 to which the lens holder 6 is attached are displayed.

  As shown in FIGS. 4 and 5, the lens holder 6 is configured by combining an upper surface portion 61, a first leaf spring 62, a spacer 63, a second leaf spring 64, and a lower surface portion 65. The An opening is formed in the central portion of each component, and as shown in FIG. 5, a space for accommodating the lens case 7 is formed inside the lens holder 6 when the components are combined. Is done. In a state of being held by the lens holder 6, the small diameter portion 7 a of the lens case 7 is in a state of protruding upward from the opening of the upper surface portion 61 as shown in FIG.

  As shown in FIG. 4, the upper surface portion 61 has a cover portion 61a that covers the vicinity of the upper surface of the large-diameter portion 7b of the lens case 7 with its inner wall surface, and a ridge formed so as to protrude from the lower end portion of the cover portion 61a toward the device side Part 61b. The upper surface of the cover portion 61a functions as the upper surface of the lens holder 6 itself, and the above-described coil 10 is bonded and fixed. A plurality (four in this case) of projecting pieces 61c projecting upward are formed on the upper surface of the cover portion 61a. The protruding piece 61c comes into contact with the outer peripheral surface of the small diameter portion 7a of the lens case 7 at its inner wall, and plays a role of improving the positional accuracy of the lens case 7. A concave portion 61d for fine adjustment of the lens position is formed on the outer surface of the protruding piece 61c. The lens position is adjusted by rotating the lens holder 6 using a tool that engages with these recesses 61d. A groove 61e that allows the coil 10 to pass therethrough is formed on the peripheral surface of the cover 61a. At a predetermined position on the outer peripheral side of the lower surface of the flange portion 61b, a protruding portion 61f that comes into contact with a protruding portion 65b of the lower surface portion 65 described later is formed through a notch 62h of the first leaf spring 62 described later. Yes. In addition, a protrusion 61g that enters a notch 62i or the like of a first leaf spring 62 described later is formed at a predetermined position on the inner peripheral side of the lower surface of the flange 61b.

  The first leaf spring 62 is made of a conductive material such as phosphor bronze, for example. The first leaf spring 62 is provided at an annular portion 62a having an opening in the center, a plurality of arm portions 62b extending from a predetermined position of the annular portion 62a, and an end portion of each arm portion 62b. And a fixing portion 62c. A connecting piece 62d that is bent downward is formed in the specific fixing portion 62c. The distal end of the connecting piece 62d is connected to a clamping part 62g formed on a contact member 62f having a contact part 62e. On the outer peripheral side of the annular portion 62a, a notch 62h is formed at a position corresponding to the protrusion 61f of the upper surface portion 61. On the other hand, a notch 62i is formed at a position corresponding to the protrusion 61g of the upper surface 61 on the inner peripheral side of the annular portion 62a. A coil connection piece 62j protruding to the side of the device is formed at a predetermined position of the annular portion 62a (not shown in FIG. 4).

  The spacer 63 has an annular portion 63a having an opening at the center. On the outer peripheral side of the annular portion 63a, a notch portion 63b is formed at a position corresponding to the protruding portion 61f of the upper surface portion 61. On the other hand, a notch 63c is formed at a position corresponding to the protrusion 61g of the upper surface portion 61 on the inner peripheral side of the annular portion 63a.

  Similar to the first leaf spring 62, the second leaf spring 64 is made of, for example, a conductive material such as phosphor bronze. The second leaf spring 64 is provided at an annular portion 64a having an opening at the center, a plurality of arm portions 64b extending from a predetermined position of the annular portion 64a, and an end portion of each arm portion 64b. And a fixing portion 64c. A connecting piece 64d that is bent downward is formed on the specific fixing portion 64c. The distal end of the connecting piece 64d is connected to a clamping part 64g formed on a contact member 64f having a contact part 64e. On the outer peripheral side of the annular portion 64a, a notch portion 64h is formed at a position corresponding to the protruding portion 61f of the upper surface portion 61. On the other hand, on the inner peripheral side of the annular portion 64a, a notch portion 64i is formed at a position corresponding to the protruding portion 61g of the upper surface portion 61. A coil connection piece 64j protruding to the side of the device is formed at a predetermined position of the annular portion 64a.

  The lower surface portion 65 has an annular portion 65a having an opening at the center. At a predetermined position on the outer peripheral side of the upper surface of the annular portion 65a, a protruding portion 65b that contacts the protruding portion 61f of the upper surface portion 61 is formed. A thread 65 c that engages the thread 7 d of the lens case 7 is formed on the inner peripheral surface of the lower surface portion 65.

  As shown in FIG. 5, the lens holder 6 includes a protrusion 61 f formed on the upper surface portion 61 facing downward while sandwiching the first leaf spring 62, the spacer 63, and the second leaf spring 64. For example, by adhering and fixing the contact surface with the protrusion 65b formed on the lower surface portion 65 toward the upper side, these components are integrated.

  Here, the case where the lens holder 6 is integrated by bonding and fixing the protruding portion 61f of the upper surface portion 61 and the protruding portion 65b of the lower surface portion 65 is shown, but the structure for integrating the lens holder 6 is shown. However, the present invention is not limited to this, and can be changed as appropriate. Any method may be adopted as long as the lens holder 6 can be integrated. For example, a part composed of the upper surface portion 61, the first leaf spring 62 and the spacer 63 is formed by in-mold molding, while a component composed of the second leaf spring 64 and the lower surface portion 65 is formed by in-mold molding. You may make it adhere and fix. Alternatively, all components from the upper surface portion 61 to the lower surface portion 65 may be formed by in-mold molding.

  When assembled in this way, the first plate spring 62 and the second plate spring 64 of the lens holder 6 are arranged at different height positions in the lens holder 6 as shown in FIG. . Further, the fixing portion 62c of the first leaf spring 62 and the fixing portion 64c of the second leaf spring 64 are arranged at different positions in the circumferential direction in the lens holder 6, as shown in FIG. The fixed part 62 c and the fixed part 64 c are arranged close to each other at the four corners of the lens holder 6. As shown in FIG. 5, the fixing portion 62 c and the fixing portion 64 c are formed with semicircular arc-shaped notches for receiving the pins 8 f erected on the case 8.

  On the other hand, on the upper surface of the case 8, the vicinity of the pins 8 f erected at the four corners is the position of the fixing portion 62 c of the first leaf spring 62 and the fixing portion 64 c of the second leaf spring 64 that the lens holder 6 has. It is provided in the shape which has the level | step difference according to. Specifically, the first fixing portion 8g according to the position of the fixing portion 64c of the second leaf spring 64 and the fixing portion 62c of the first leaf spring 62 are arranged at a position higher than the first fixing portion 8g. A second fixing portion 8h is provided in accordance with the position.

  In the case 8 having such a shape, each fixing portion 64c of the second leaf spring 64 is fixed to the first fixing portion 8g. In this case, the fixing portion 64c is fixed in a state where the pin 8f is accommodated in the notch portion. In this way, the second leaf spring 64 is prevented from being displaced from the case 8 by fixing the pin 8 f in the notched portion. At this time, the annular portion 64 a of the second leaf spring 64 is disposed inside the opening 8 a of the case 8.

  Similarly, each fixing portion 62c of the first leaf spring 62 is fixed to the second fixing portion 8h. In this case, the fixing portion 62c is fixed in a state where the pin 8f is accommodated in the notch portion. In this way, the first leaf spring 62 is prevented from being displaced from the case 8 by being fixed in a state where the pin 8f is accommodated in the notch. At this time, the annular portion 62 a of the first leaf spring 62 is disposed inside the opening 8 a of the case 8.

  FIG. 6 is a perspective view for explaining the relationship between the lens holder 6 and the case 8 included in the lens driving device 1 according to the present embodiment. As described above, the lens holder 6 is integrated by sandwiching the first plate spring 62 and the second plate spring 64 between the upper surface portion 61, the spacer 63, and the lower surface portion 65, and these first plate springs. Only the 62 and the second leaf spring 64 are fixed to the case 8. Therefore, the lens holder 6 is configured to be movable in the vertical direction shown in FIG. 6 within a certain range allowed by the first plate spring 62 and the second plate spring 64.

  In this case, when fixed to the case 8, the connecting piece 62 d of the first leaf spring 62 and the connecting piece 64 d of the second leaf spring 64 are accommodated in the groove portion 8 e of the case 8. The contact member 62f and the contact member 64f connected to the connecting piece 62d and the connecting piece 64d, respectively, are disposed on the lower surface side of the case 8. The contact portion 62e of the contact member 62f and the contact portion 64e of the contact member 64f are accommodated in a recess 8d formed in the case 8. Thus, the contact part 62e and the contact part 64e accommodated in the recess 8d come into contact with the upper end part of the spring 5f embedded in the base 5.

  Next, the configuration of the magnet 11 included in the lens driving device 1 according to the present embodiment will be described. FIG. 7 is a top view of the magnet 11 included in the lens driving device 1 according to the present embodiment.

  As shown in FIG. 7, in the magnet 11, the thick part 11a and the thin part 11b are formed in the predetermined position. The thick part 11 a and the thin part 11 b are formed at positions facing each other across the center of the magnet 11. The thick portion 11a is disposed at a position corresponding to the four corners (portions where the leg portions 12b are formed) of the yoke 12 in a state where the magnet 11 is fixed to the yoke 12. On the other hand, the thin portion 11 b is disposed at a position corresponding to the notch portion 12 c of the yoke 12 in a state where the magnet 11 is fixed to the yoke 12.

  Next, the configuration of the yoke 12 included in the lens driving device 1 according to the present embodiment will be described. FIG. 8 is a perspective view of the yoke 12 included in the lens driving device 1 according to the present embodiment. FIG. 9 is a perspective view when the yoke 12 included in the lens driving device 1 according to the present embodiment is attached to the lens holder 6 or the like.

  As shown in FIG. 8, four notches 12 c are formed on the inner peripheral surface of the yoke 12. The upper end portion of each notch portion 12 c reaches the vicinity of the center of the upper surface of the yoke 12. When the yoke 12 having such a configuration is attached to the lens holder 6 or the like, as shown in FIG. 9, the cutout portion 12 c of the yoke 12 is a protruding piece formed on the upper surface portion 61 of the lens holder 6. Accept 61c.

  Here, the positional relationship among the lens holder 6, the magnet 11, and the yoke 12 included in the lens driving device 1 according to the present embodiment will be described. FIG. 10 is a top view of the lens driving device 1 according to the present embodiment. In FIG. 10, the internal configuration is displayed via the yoke 12 for convenience of explanation.

  As shown in FIG. 10, the protruding piece 61 c formed on the upper surface portion 61 of the lens holder 6 is accommodated in the inner portion of the notch portion 12 c of the yoke 12. Since the protruding piece 61c is accommodated in the notch 12c of the yoke 12 as described above, a large space for the lens case 7 attached to the lens holder 6 can be secured. As a result, the lens case 7 holds the projection piece 61c. It is possible to keep the diameter of the lens to be large.

  Further, the magnet 11 is disposed at a position corresponding to the portion where the notch portion 12c of the yoke 12 is formed with the thin portion 11b, and the thick portion 11a is formed at the portion where the notch portion 12c of the yoke 12 is not formed. It is arranged at the corresponding position. Thereby, the magnetic force in the portion where the notch 12c is not formed in the yoke 12 is increased, and the driving force in the apparatus main body is prevented from being lowered.

  In particular, the thick portion 11a of the magnet 11 is disposed at a position corresponding to the corner portion of the apparatus main body. For this reason, the space near the corners of the apparatus main body can be used effectively, and the thick part 11a of the magnet 11 can be formed without increasing the external dimensions of the apparatus main body.

  As described above, according to the lens driving device 1 according to the present embodiment, the plurality of cutout portions 12 c formed on a part of the yoke 12 arranged around the lens holder 6 are formed on the upper surface portion 61 of the lens holder 6. Since the formed protruding piece 61c is received, it is possible to secure a space for holding the lens in the lens holder 6 while maintaining the radial dimension in the apparatus main body. Thereby, it is possible to ensure the diameter of the lens held by the apparatus main body while preventing the radial dimension of the apparatus main body from increasing.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above-described embodiment, the case where the four notches 12c are formed in the yoke 12 is described. However, the configuration of the yoke 12 is not limited to this, and can be changed as appropriate. is there. For example, two notches 12c may be formed in the yoke 12.

It is a disassembled perspective view of the lens drive device which concerns on one embodiment of this invention. It is a perspective view at the time of assembling the lens drive device which concerns on the said embodiment. It is sectional drawing at the time of assembling the lens drive device which concerns on the said embodiment. It is a disassembled perspective view for demonstrating the lens holder which the lens drive device which concerns on the said embodiment has. It is a perspective view at the time of assembling the lens holder which the lens drive device concerning the above-mentioned embodiment has. It is a perspective view for demonstrating the relationship between the lens holder which the lens drive device which concerns on the said embodiment has, and a case. It is a top view of the magnet which the lens drive device concerning the above-mentioned embodiment has. It is a perspective view of the yoke which the lens drive device concerning the above-mentioned embodiment has. It is a perspective view at the time of attaching the yoke which the lens drive device concerning the above-mentioned embodiment has to a lens holder etc. It is a top view of the lens drive device concerning the above-mentioned embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Image sensor 3 Board | substrate 4 IR cut filter 5 Base member (base)
6 Lens holder 61 Upper surface portion 61c Projection piece 62 First plate spring 63 Spacer 64 Second plate spring 65 Lower surface portion 7 Lens case 8 Case 9 Cover 10 Coil 11 Magnet 12 Yoke 12c Notch

Claims (4)

  A part of the yoke disposed around the lens holder, comprising a lens holder for holding the lens, and a lens driving unit having a magnet, a coil, and a yoke for moving the lens holder along the optical axis direction A lens driving device characterized in that a plurality of notches are formed in the lens, and a part of the lens holder is received by the notches.   2. The magnet disposed in the yoke is formed in an annular shape, and a thick portion is provided at a position corresponding to a non-formed portion of the notch in the yoke of the magnet. Lens drive device.   The lens driving device according to claim 2, wherein the thick portion of the magnet is disposed at a position corresponding to a corner portion of a base member of the device main body having a rectangular shape.   The lens driving device according to claim 1, wherein a cover member is disposed at a position corresponding to the notch in the yoke.

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