JP5008414B2 - Lens drive device - Google Patents

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.

Conventionally, in a lens driving device mounted on a digital camera or a camera-equipped mobile phone, a device that uses an elastic body for electrical connection between substrates in the device and realizes reliable electrical connection between the substrates has been proposed. (For example, refer to 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. In such a lens driving device, the space for electrical connection between the components in the device is also required to be reduced in size.
JP 2006-210036 A

  However, in the conventional lens driving device described above, an elastic body is disposed between the substrates separated by a certain distance, and electrical connection is realized through wiring exposed on the surface of the elastic body. Therefore, there is a problem that a space for accommodating the elastic body must be secured in the apparatus, and there is a problem that it is impossible to meet the demand for further downsizing of the apparatus main body.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a lens driving device capable of ensuring an electrical connection path between components in the apparatus while downsizing the apparatus main body. To do.

The lens driving device of the present invention includes a lens holder that holds a lens and is swingable in a certain range via a leaf spring in the optical axis direction, a magnet, a coil, and a magnetic body. A lens driving unit that moves the lens along the optical axis direction, a substrate that is disposed below the lens holder and on which the image sensor is mounted, and a storage that is stacked on the substrate and stores the image sensor on the substrate And a base member having a portion, wherein the leaf spring is integrated with the lens holder, and is connected to a coil of the lens driving portion, and penetrates the base member in the vertical direction. a through-hole formed by the feature that it has provided the elastic connection members that electrically connect the contact portion provided on the upper surface of the substrate and contact portion provided at an end portion of the leaf spring To do.

  According to the lens driving device, since the elastic connection member that electrically connects the contact portion of the coil of the lens driving portion and the contact portion of the substrate is disposed in the through hole formed in the base member, It is no longer necessary to provide a space for electrically connecting the lens driving unit and the substrate to each other, so that it is possible to secure an electrical connection path between components in the apparatus while reducing the size of the apparatus body. .

  In the lens driving device, it is preferable that the contact portion of the substrate is provided in the vicinity of the side surface portion of the substrate. In this case, since the contact portion is provided in the vicinity of the side surface portion, it is possible to ensure a large area for mounting the image pickup element on the substrate.

  In particular, in the lens driving device, it is preferable that a plurality of external connection members are provided on a side surface portion of the substrate, while a contact portion of the substrate is disposed between the plurality of external connection members. In this case, since the contact portion of the substrate is arranged between the plurality of external connection members, it is possible to prevent the substrate itself from becoming large while securing a region for mounting the image sensor on the substrate. It becomes.

  Moreover, in the said lens drive device, it is preferable to provide a wall part between the said through-hole in the said base member, and the said accommodating part. In this case, since the space between the through hole and the storage portion is blocked by the wall portion, it is possible to prevent the dust from entering the storage portion.

  Further, in the lens driving device, three of the four sides of the imaging element are electrically connected to the substrate, and a contact portion of the substrate is provided at a position on the substrate corresponding to the remaining one side. It is preferable. In this case, since the contact portion is provided at a position on the substrate where the image sensor and the substrate are not electrically connected, the device itself can be reduced in size by the connection portion between the image sensor and the substrate. It becomes possible.

  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, the lens driving device 1 according to the present embodiment includes a substrate 3 on which an image sensor 2 as an image sensor is mounted, and a base member (hereinafter simply referred to as “base” on which an IR cut filter 4 is mounted. ) 5, a lens holder 6 is attached, a case 8 to which a lens case 7 is attached via the lens holder 6, a cover 9 that covers the case 8 from above the attached lens holder 6, and a lens holder 6 includes a coil 10 fixed to 6, a magnet 11 and a yoke 12 disposed above the lens holder 6.

  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. Among them, a pair of contact portions 3b is 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. In the vicinity of 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 rectangular shape slightly larger than the opening 5a is formed around the opening 5a. Has been. The IR cut filter 4 has a rectangular shape corresponding to the recess 5b and is attached to the recess 5b. At the four corners of the base 5, projecting pieces 5c projecting upward are formed, and projecting pieces 5d projecting upward in the same manner are formed in the vicinity thereof. These protruding pieces 5c and 5d are in contact with leg portions 12b of the yoke 12, which will be described later, to position the yoke 12. Between the protruding pieces 5d, an accommodating portion 5e for accommodating a lower surface of a side surface portion 8b of the case 8 described later is provided. A pair of through holes 5 f are formed at positions corresponding to the contact portions 3 b formed on the substrate 3 in the base 5. In this through hole 5f, a spring 5g is disposed as an elastic connecting member for electrically connecting a contact portion of a leaf spring of the lens holder 6 described later and a contact portion 3b of the substrate 3. The spring 5g is formed of a conductive material such as metal and has elasticity. In addition, a pair of convex parts 5h accommodated in the accommodating part 8g formed in the case 8 described later is formed at a predetermined position on the side where the protruding piece 5d is not formed.

  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 in which both end portions enter the inside of the apparatus main body, and a protrusion 8d for positioning a leg portion 12 of a yoke 12 described later is formed on the surface of the side surface portion 8b. Further, a cutout portion 8e opened upward is formed at the center portion. On the other hand, the side surface portion 8c is formed with a notch portion 8f that opens upward at the center thereof, and a housing portion 8g that houses the convex portion 5h of the base 5, and a convex portion 9h of the cover 9 that will be described later. A groove 8h is formed to accommodate the. Further, at the four corners of the case 8, pins 8i projecting upward are erected.

  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. In addition, a plurality of concave portions 7d for fine adjustment of the held lens position are formed at the upper end portion of the peripheral surface of the small diameter portion 7a. A screw thread 7e is formed on the upper side of the peripheral surface of the large diameter portion 7b. The thread 7e 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 is provided with an engaging portion 9d that engages with the side surface portion 8b at the lower end portion and engages with a bracket 12a of the yoke 12 described later at the upper end portion. The engaging portion 9d is formed with a convex portion 9e that engages with the notch portion 8e of the case 8, and a holding piece 9f that holds the side surface of the bracket 12a of the yoke 12. On the other hand, the side 9c is formed with a convex part 9g that engages with the notch part 8f of the case 8, a convex part 9h that enters the groove part 8h of the case 8, and a convex part 9i that enters the accommodating part 8g of the case 8. Yes. Further, at the four corners of the cover 9, holes 9j through which the pins 8i of the case 8 pass are formed.

  The magnet 11 is fixed to the inner wall surface of the yoke 12. The magnet 11 has an annular shape having a larger diameter than the coil 10. 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. The leg portion 12b has a cutout portion 12c that opens downward. The notch 12 c accommodates the protrusion 8 d of the case 8. An engaging portion 12d that engages with the holding piece 9f of the cover 9 is formed on an end surface of the bracket 12a corresponding to the side 9b of the cover 9.

  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 a state where the lens driving device 1 is assembled, the case 8 is overlaid on the base 5 as shown in FIGS. At this time, as shown in FIG. 2, the lower surface of the side surface portion 8 b of the case 8 is accommodated in the accommodating portion 5 e of the base 5, and the convex portion 5 h of the base 5 is accommodated in the accommodating portion 8 g of the case 8. Thereby, positioning of the case 8 on the base 5 is performed.

  As shown in FIGS. 2 and 3, a cover 9 is overlaid on the case 8. At this time, as shown in FIG. 2, the convex part 9e of the cover 9 is accommodated in the notch part 8e of the case 8, and the convex part 9g, the convex part 9h, and the convex part 9i are the notch part 8f and the groove part 8h, respectively. And it accommodates in the accommodating part 8g. Thereby, positioning of the cover 9 on the case 8 is performed.

  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 engaging portion 12 d of the bracket 12 a of the yoke 12 is held by the holding piece 9 f of the cover 9. The leg portion 12 b of the bracket 12 a is disposed in a space formed by the protruding pieces 5 c and 5 d of the base 5 and the side surface portion 8 c of the case 8. In this case, the protrusion 8d formed on the side surface portion 8b of the case 8 is accommodated in the notch portion 12c formed on the leg portion 12b. Thereby, positioning of the yoke 12 on the cover 9 is performed.

  As shown in FIG. 3, 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.

  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 configurations of the substrate 3, the base 5, the lens holder 6, and the case 8, these configurations will be described below.

  First, the configuration of the substrate 3 included in the lens driving device 1 according to the present embodiment will be described. FIG. 4 is a top view of the substrate 3 included in the lens driving device 1 according to the present embodiment. As shown in FIG. 4, the substrate 3 is provided with a plurality (six in this case) of external connection members 3a on one side on the left side shown in FIG. A plurality of terminals 3c for electrically connecting the image sensor 2 are provided in the vicinity of the outer edge on three sides other than the one side provided with the external connection member 3a.

  As described above, the pair of contact portions 3b is provided in the vicinity of the external connection member 3a. In particular, the contact portions 3b are provided so as to be disposed between the external connection member 3a and the external connection member 3a, respectively. The reason for providing the space between the external connection member 3a and the external connection member 3a as described above is to secure a space for disposing the image sensor 2 on the substrate 3. Further, as will be described in detail later, in order to prevent dust and the like from entering the image sensor 2, a wall portion formed on the back surface side of the base 5 is formed on the outer side of the base 5 as much as possible.

  Next, the configuration of the base 5 included in the lens driving device 1 according to the present embodiment will be described. FIG. 5 is a perspective view for explaining the relationship between the substrate 3 and the base 5 included in the lens driving device 1 according to the present embodiment. FIG. 6 is a bottom view of the base 5 included in the lens driving device 1 according to the present embodiment. In addition, in FIG. 5, it is the exploded perspective view which extracted only the board | substrate 3 and the base 5, and was seen from the downward side.

  As shown in FIGS. 5 and 6, a space 5 i that functions as a storage portion that stores the image sensor 2 fixed to the substrate 3 is formed on the back surface of the base 5. In the space 5i, a plurality of biasing pieces 5j that lightly bias the image sensor 2 are provided. An outer edge 5k is provided around the space 5i. The outer edge 5k has a recess 5l that enters the inside of the base 5 at a position corresponding to the through hole 5f. The inner wall of the recess 51 serves as a wall that prevents dust and the like from entering the image sensor 2 through the through hole 5f.

  When the substrate 3 and the base 5 having such a configuration are assembled, the spring 5g is disposed in the through hole 5f formed in the base 5 as shown in FIG. In this case, the lower end portion of the spring 5g is in contact with the contact portion 3b formed on the substrate 3. On the other hand, the upper end of the spring 5 g slightly protrudes upward from the upper surface of the base 5.

  In the lens driving device 1 according to the present embodiment, the lens holder 6 fixed to the case 8 is stacked from above the base 5 assembled in this way. In this case, the end of the leaf spring of the lens holder 6 contacts the upper end of the spring 5g that slightly protrudes from the through hole 5f of the base 5. FIG. 8 is a perspective view for explaining a state in which the end portion of the leaf spring included in the lens holder 6 is in contact with the upper end portion of the spring 5g. In FIG. 8, the case 8 to which the lens holder 6 is fixed is omitted for convenience of explanation. As shown in FIG. 8, the lens holder 6 has two leaf springs, and the end portions (A and B shown in the figure) of the different leaf springs are in contact with the upper end portions of the different springs 5g.

  Next, the configuration of the lens holder 6 included in the lens driving device 1 according to the present embodiment will be described. FIG. 9 is an exploded perspective view of the lens holder 6 included in the lens driving device 1 according to the present embodiment, and FIG. 10 illustrates a case where the lens holder 6 included in the lens driving device 1 according to the present embodiment is assembled. It is a perspective view. FIG. 11 is a top view when the lens holder 6 included in the lens driving device 1 according to the present embodiment is assembled. In FIG. 9, for convenience of explanation, the coil 10 fixed to the lens holder 6 is displayed.

  As shown in FIGS. 9 and 10, 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. 10, 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 protrudes upward from the opening of the upper surface portion 61 as shown in FIG.

  As shown in FIG. 9, 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 on 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 pair of cutout portions 61c is formed at a predetermined position of the cover portion 61a. Further, a thread 61d that engages with a thread 7e formed on the lens case 7 is formed on the inner wall of the cover portion 61a. A pair of projecting portions 61e are formed at predetermined positions on the flange portion 61b so as to project to the side of the apparatus. The protrusion 61e is formed with a hole 61f into which a pin 63c of a spacer 63 described later is inserted. Further, a plurality of notches 61g into which a protrusion 63d of a spacer 63 described later is inserted are formed at predetermined positions on the outer peripheral surface of the flange 61b. Further, a protrusion 61h that enters a notch 63f of a spacer 63 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 contact portion 62d that contacts the spring 5g accommodated in the through hole 5f of the base 5 is connected to the specific fixing portion 62c. The contact portion 62d is formed by bending a portion extending from the fixed portion 62c substantially vertically downward and further bending the tip thereof substantially vertically inside the apparatus. The contact portion 62d is formed with a hole portion 62e into which a pin 8l of the case 8 described later enters. On the outer peripheral side of the annular portion 62a, a notch portion 62f is formed at a position corresponding to the notch portion 61g of the upper surface portion 61. On the other hand, a notch 62g is formed at a position corresponding to the protrusion 61h of the upper surface 61 on the inner peripheral side of the annular portion 62a. Furthermore, a holding part 62h that holds the end of the coil 10 (10a shown in FIG. 10) is formed at a predetermined position on the outer peripheral side of the annular part 62a.

  The spacer 63 has an annular portion 63a having an opening at the center. The annular portion 63a causes the first leaf spring 62 and the second leaf spring 64 to be arranged in the lens holder 6 at a predetermined interval, that is, an interval corresponding to the thickness of the annular portion 63a. It has become. At a predetermined position on the upper surface side of the annular portion 63a, a pair of projecting portions 63b that project from the device side are formed. The protrusion 63b is provided with a pin 63c that enters the hole 61f of the upper surface 61. At a predetermined position on the outer peripheral side of the annular portion 63a, a protruding portion 63d that enters the cutout portion 61g of the upper surface portion 61 is formed. In addition, a plurality of notches 63e into which protrusions 65d of the lower surface portion 65 (to be described later) enter are formed at predetermined positions on the outer peripheral side of the lower surface of the annular portion 63a. On the other hand, a plurality of notches 63f that enter the protrusion 61h of the upper surface portion 61 are formed at predetermined positions on the inner peripheral side of the annular portion 63a. Further, a pair of projecting portions 63g that project from the device side are formed at predetermined positions on the lower surface side of the annular portion 63a. The protrusion 63g is provided with a pin 63h that enters a hole 65c of the lower surface 65 described later.

  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 contact part 64d that contacts the spring 5g accommodated in the through hole 5f of the base 5 is connected to the specific fixing part 64c. The contact portion 64d is formed by bending a portion extending from the fixed portion 64c substantially vertically downward and further bending its tip substantially vertically inside the apparatus. The contact portion 64d is formed with a hole portion 64e into which a pin 8l of the case 8 described later enters. On the outer peripheral side of the annular portion 64a, a notch portion 64f is formed at a position corresponding to a projection portion 65d of the lower surface portion 65 described later. On the other hand, on the inner peripheral side of the annular portion 64a, a notch portion 64g is formed at a position corresponding to a projection portion 65e of the lower surface portion 65 described later. Further, a holding portion 64h that holds the end portion of the coil 10 (10b shown in FIG. 10) is formed at a predetermined position on the outer peripheral side 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 of the annular portion 63a, a pair of projecting portions 65b projecting to the side of the apparatus is formed. The protrusion 65b is formed with a hole 65c into which the pin 63h of the spacer 63 is inserted. At a predetermined position on the outer peripheral side of the upper surface of the annular portion 65a, a protrusion 65d that enters the notch 63e of the spacer 63 is formed. In addition, a protrusion 65e that enters the notch 63f of the spacer 63 is formed at a predetermined position on the inner peripheral side of the upper surface of the annular portion 65a.

  As shown in FIG. 10, the lens holder 6 inserts the pin 63 c formed on the spacer 63 into the hole 61 f of the upper surface portion 61 with the first leaf spring 62 interposed therebetween, while the second leaf spring 64. The pin 63h formed on the spacer 63 is inserted into the hole 65c of the lower surface portion 65 with the pinch interposed therebetween. For example, the protrusion 63d and the like formed on the spacer 63 and the notch 61g and the like formed on the upper surface 61 are bonded and fixed, while the protrusion 65d and the like formed on the lower surface 65 and the spacer 63 are fixed. These components are configured so as to be integrated by bonding and fixing the notches 63e and the like formed in. In this case, as shown in FIG. 11, the fixing portion 62c of the first leaf spring 62 with respect to the case 8 is disposed at a position different from the fixing portion 64c of the second leaf spring 64. 62 and the second leaf spring 64 can be incorporated from one direction.

  Here, the case where the lens holder 6 is integrated by bonding and fixing the protrusion and the notch is shown, but the structure for integrating the lens holder 6 is not limited to this, Changes can be made 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, as shown in FIG. 11, the fixing portion 62c of the first leaf spring 62 and the fixing portion 64c of the second leaf spring 64 do not overlap when viewed from above at different positions in the circumferential direction of the lens holder 6. Are arranged as follows. The fixing part 62c and the fixing part 64c are arranged close to each other at the four corners of the lens holder 6. As shown in FIG. 11, the fixing portion 62c and the fixing portion 64c are formed with a notch portion 62i and a notch portion 64i for receiving the pins 8i erected on the case 8, respectively. These notches 62i and 64i have a circular shape when viewed from above.

  Next, the configuration of the case 8 included in the lens driving device 1 according to the present embodiment will be described. FIG. 12 is a perspective view of the case 8 included in the lens driving device 1 according to the present embodiment. In FIG. 12, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 12, pins 8 i are erected on the upper surface of the case 8 at the four corners. The vicinity of these pins 8 i is provided in a shape having a step corresponding to the positions of the fixing portion 62 c of the first leaf spring 62 and the fixing portion 64 c of the second leaf spring 64 of the lens holder 6. . The dimension of this step is a dimension corresponding to the thickness of the annular portion 63a of the spacer 63. Specifically, the first fixing part 8j corresponding to the position of the fixing part 64c of the second leaf spring 64 and the fixing part 62c of the first leaf spring 62 are arranged at a position higher than the first fixing part 8j. And a second fixing portion 8k corresponding to the position of.

  Here, the relationship between the case 8 and the fixing portion 62c of the first leaf spring 62 and the fixing portion 64c of the second leaf spring 64 will be described. FIG. 13 is a perspective view for explaining the relationship between the case 8 and the fixing portion 64 c of the second leaf spring 64, and FIG. 14 is a relationship between the case 8 and the fixing portion 62 c of the first leaf spring 62. It is a perspective view for demonstrating.

  As shown in FIG. 13, each fixing portion 64c of the second leaf spring 64 is fixed to the first fixing portion 8j. In this case, the fixing part 64c is fixed in a state where the notch part 64i accommodates the pin 8i. In this manner, the second leaf spring 64 is prevented from being displaced from the case 8 by fixing the pin 8i in the notch 64i. In this case, the annular portion 64 a of the second leaf spring 64 is disposed inside the opening 8 a of the case 8.

  On the other hand, as shown in FIG. 14, each fixing portion 62c of the first leaf spring 62 is fixed to the second fixing portion 8k. In this case, the fixing part 62c is fixed in a state where the notch part 62i accommodates the pin 8i. In this way, the first leaf spring 62 is prevented from being displaced from the case 8 by fixing the pin 8i in the notch 62i. In this case, the annular portion 62 a of the first leaf spring 62 is disposed inside the opening 8 a of the case 8.

  FIG. 15 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 swingable in the vertical direction shown in FIG. 15 within a certain range allowed by the first plate spring 62 and the second plate spring 64. The first leaf spring 62 and the second leaf spring 64 are attached to the case 8 while maintaining an interval separated by the spacer 63. For this reason, when the lens holder 6 swings in the vertical direction with respect to the case 8, the first leaf spring 62 and the second leaf spring 64 are not electrically short-circuited.

  When fixed to the case 8 in this manner, the contact portions 62d and 64d of the first plate spring 62 and the second plate spring 64 of the lens holder 6 are the accommodating portions formed in the case 8. It wraps around the back side of the case 8 through 8g. FIG. 16 is a perspective view when the lens holder 6 and the case 8 shown in FIG. 15 are viewed from the lower surface side. As shown in FIG. 16, on the back surface of the case 8, the contact portion 62d and the contact portion 64d extend to the side surface portion 8b side along the opening portion 8a. A pin 8l formed on the lower surface of the case 8 is engaged with the hole 62e and the hole 64e formed in the contact 62d and the contact 64d, respectively. Thereby, the contact part 62d and the contact part 64d are prevented from being displaced from a predetermined position of the case 8. Thus, the contact part 62d and the contact part 64d that wrap around the back side of the case 8 come into contact with the upper end of the spring 5g accommodated in the through hole 5f of the base 5 (see FIG. 8).

  In the lens driving device 1 according to the present embodiment, the lens held by the lens case 7 is driven by moving the lens case 7 up and down. Hereinafter, control in the case of moving the lens case 7 up and down in the lens driving device 1 according to the present embodiment 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 first plate spring 62 and the second plate spring 64 are used as the energizing means. Specifically, the spring 5g embedded in the base 5 from the contact part 3b of the substrate 3, the contact part 62d in the first leaf spring 62, the fixing part 62c, the arm part 62b, the annular part 62a and the clamping part 62h. An electric current is sent to the coil 10 via this. Then, the current flowing through the coil 10 is supplied to the substrate via the clamping portion 64h, the annular portion 64a, the arm portion 64b, the fixing portion 64c, the contact portion 64d, and the spring 5g embedded in the base 5 in the second leaf spring 64. 3 is sent out.

  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.

  Thus, according to the lens driving device 1 according to the present embodiment, the contact portions 62d and 64d connected to the coil 10 of the lens driving portion and the contact portion of the substrate 3 are formed in the through hole 5f formed in the base 5. Since the spring 5g that electrically connects 3b is disposed, it is not necessary to provide a space for electrically connecting the lens driving unit and the substrate 3 in the apparatus, so that the apparatus main body can be downsized. It is possible to secure an electrical connection path between components in the apparatus.

  Further, in the lens driving device 1 according to the present embodiment, since the contact portion 3b of the substrate 3 is provided in the vicinity of the side surface portion of the substrate 3, an area for mounting the image sensor 2 on the substrate 3 is provided. It is possible to secure a large amount.

In particular, in the lens driving device 1 according to the present embodiment, a plurality of external connection members 3a are provided on the side surface portion of the substrate 3, while the contact portions 3b of the substrate 3 are disposed between the plurality of external connection members 3a. Therefore, it is possible to prevent the substrate 3 itself from becoming large while securing a region for mounting the image sensor 2 on the substrate 3.

  Further, in the lens driving device 1 according to the present embodiment, since the wall portion is provided between the through hole 5f in the base 5 and the storage portion 5i, the space between the through hole 5f and the storage portion 5i is provided. Therefore, it is possible to prevent the dust from entering the storage portion 5i. As a result, it is possible to prevent a malfunction or malfunction of the image sensor 2 or the like.

  Furthermore, in the lens driving device 1 according to the present embodiment, three of the four sides of the image sensor 2 are electrically connected to the substrate 3 and contact points are positioned on the substrate 3 corresponding to the remaining one side. Since the portion 3b is provided, the device itself can be reduced in size by the connection portion between the image sensor 2 and the substrate 3.

  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 embodiment, the lens holder 6 has two leaf springs (the first leaf spring 62 and the second leaf spring 64), but the lens holder 6 necessarily has these. There is no need. Similarly to the above-described embodiment, the lens holder 6 and the two leaf springs may be separate components on the assumption that the two leaf springs are arranged at different heights. Further, the number of leaf springs is not limited to two and may be set to three or more.

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 top view of the board | substrate which the lens drive device which concerns on the said embodiment has. It is a perspective view for demonstrating the relationship between the board | substrate and base which the lens drive device which concerns on the said embodiment has. It is a bottom view of the base which the lens drive device concerning the above-mentioned embodiment has. It is a perspective view of the state where the substrate and base which the lens drive device concerning the above-mentioned embodiment have piled up. It is a perspective view for demonstrating the state which the leaf | plate spring which the lens holder which the lens drive device which concerns on the said embodiment has has has a spring contacts. It is a disassembled perspective view of the lens holder which the lens drive device concerning the above-mentioned 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 top view at the time of assembling the lens holder which the lens drive device which concerns on the said embodiment has. It is a perspective view of the case which the lens drive device concerning the above-mentioned embodiment has. It is a perspective view for demonstrating the relationship between the case which the lens drive device which concerns on the said embodiment has, and the fixing | fixed part of a 2nd leaf | plate spring. It is a perspective view for demonstrating the relationship between the case which the lens drive device which concerns on the said embodiment has, and the fixing | fixed part of a 1st leaf | plate spring. 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 perspective view at the time of seeing the lens holder and case shown in FIG. 15 from the lower surface side.

Explanation of symbols

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

Claims (5)

A lens holder that holds the lens and is disposed so as to be swingable in the optical axis direction within a certain range via a leaf spring, and has a magnet, a coil, and a magnetic body, and moves the lens holder along the optical axis direction. A lens driving unit, a substrate disposed on the lower side of the lens holder, on which an image sensor is mounted, and a base member having a storage unit that is stacked on the substrate and stores the image sensor on the substrate. And a lens driving device in which the leaf spring is integrated with the lens holder and connected to the coil of the lens driving unit,
An elastic connection member that electrically connects a contact portion provided at an end portion of the leaf spring and a contact portion provided on an upper surface of the substrate into a through hole formed through the base member in the vertical direction. A lens driving device comprising:   2. The lens driving device according to claim 1, wherein the contact portion of the substrate is provided in the vicinity of a side surface portion of the substrate.   The lens driving device according to claim 2, wherein a plurality of external connection members are provided on a side surface portion of the substrate, and a contact portion of the substrate is disposed between the plurality of external connection members.   The lens driving device according to any one of claims 1 to 3, wherein a wall portion is provided between the through hole and the storage portion in the base member.   2. The contact portion of the substrate is provided at a position on the substrate that is electrically connected to the substrate at three sides out of four sides of the image pickup device and corresponds to the remaining one side. The lens driving device according to claim 4.

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