KR20080075785A - Lens drive - Google Patents

Abstract

assignment

Provided is a lens driving apparatus that can improve workability when assembling the apparatus main body.

Resolution

A plurality of leaf springs 62, 64 for movably connecting the lens holder 6 holding the lens, the case 8 on which the lens holder 6 is mounted, and the lens holder 6 with respect to the case 8. In the lens driving apparatus 1 having a), the fixing portion 62c of the first leaf spring 62 with respect to the case 8 is positioned at a position different from the fixing portion 64c of the second leaf spring 64. In addition to the arrangement, the fixing portions of the first leaf spring 62 and the second leaf spring 64 in the case 8 are formed with a step.

Description

Lens driving device {LENS DRIVING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens drive device, and more particularly, to a lens drive device suitable for an autofocus function and a camera shake correction function in a digital camera.

Background Art [0002] Conventionally, in a lens driving apparatus mounted on a digital camera or a mobile phone equipped with a camera, a lens coil motor and two leaf springs are provided. It is proposed to control (for example, refer patent document 1). On the other hand, in recent years, miniaturization of digital cameras and camera-equipped mobile phones has been progressing, and along with this, lens driving devices used in camera modules have also been required to be miniaturized. Moreover, in such a lens drive apparatus, it is also requested | required to ensure improvement of the workability at the time of assembling.

Patent Document 1: Japanese Unexamined Patent Publication No. 2006-293244

However, in the above-described conventional lens driving apparatus, since the fixing portions of the two leaf springs have a configuration of overlapping up and down, the leaf springs are mounted from the vertical direction of the apparatus main body or from the side of the apparatus main body. There is a problem that workability at the time of assembling the apparatus main body is bad.

This invention is made | formed in view of such a problem, and an object of this invention is to provide the lens drive apparatus which can improve the workability at the time of assembling an apparatus main body.

The lens driving apparatus of the present invention includes a lens holder for holding a lens, a case to which the lens holder is mounted, and a plurality of leaf springs for movably connecting the lens holder to the case. The fixing part of the leaf spring is disposed at a position different from that of the other leaf spring, and a step is formed in the fixing portion of the leaf spring in the case, and the plate is different from the fixing portion of the leaf spring. It is characterized in that the fixing portion of the spring is formed by forming a step.

According to the said lens drive apparatus, since the fixing part of the leaf spring with respect to a case is arrange | positioned at a position different from the fixing part of another leaf spring, and a step is formed in the fixed part of the leaf spring in a case, several plate Since the spring can be mounted from one direction, the workability at the time of assembling the apparatus main body can be improved. Moreover, since a step is formed in the fixed part of the leaf spring in a case, it becomes possible to arrange | position a some leaf spring at regular intervals.

In the lens driving device, it is preferable that the case consists of a first member and a second member, and the fixing portion of the leaf spring is held in a state sandwiched between the first member and the second member. In this case, since the fixing part of the leaf spring is sandwiched between the first member and the second member, it is possible to arrange it in a state where the spacing of the plurality of leaf springs is reliably maintained.

In addition, by forming the leaf spring fixing portion at the corner of the case, the leaf spring can be fixed without reducing the size of the lens holder.

According to the present invention, the fixing portion of the leaf spring with respect to the case on which the lens holder is mounted is arranged at a position different from the fixing portion of the other leaf spring, and a step is formed in the fixing portion of the leaf spring in the case. Since the fixing part of a spring and the fixing part of another leaf spring are arrange | positioned and arrange | positioned, since several leaf spring can be mounted from one direction, the workability at the time of assembling an apparatus main body can be improved.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described in detail with reference to an accompanying drawing.

1 is an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention. As shown in FIG. 1, the lens driving apparatus 1 according to the present embodiment includes a substrate 3 on which an image sensor 2 as an imaging element is mounted, and a base member on which the IR cut filter 4 is mounted. Hereinafter, simply referred to as "base") 5, a case 8 to which the lens holder 6 is mounted, and to which the lens case 7 is mounted via the lens holder 6, and the attached lens holder. A cover 9 covered by the case 8 from above of the 6, a coil 10 fixed to the lens holder 6, a magnet 11 arranged above the lens holder 6, and It comprises a yoke 12.

As shown in FIG. 1, the board | substrate 3 is formed in square shape when seen from the upper side. On the side surface of each side in the board | substrate 3, the some external connection member 3a which connects with the exterior is formed. Among them, a pair of contact portions 3b are formed in the vicinity of the external connection member 3a formed on one side of the specific side. The image sensor 2 is fixed by wire bonding so that the imaging area 2a is arranged at the center position of the substrate 3. In addition, in FIG. 1, only the terminal part for fixing the image sensor 2 to the board | substrate 3 is shown, and the wire itself is abbreviate | omitted.

The base 5 is comprised from the plate-shaped member which has a square shape corresponding to the board | substrate 3. In the center vicinity of the base 5, the opening part 5a which has a rectangular shape is formed in the position corresponding to the imaging area 2a, and has a rectangle shape slightly larger than the opening part 5a around this opening part 5a. The recessed part 5b is formed. The IR cut filter 4 has the rectangular shape corresponding to the recessed part 5b, and is attached to the recessed part 5b. In the four corners of the base 5, the protrusion piece 5c which protrudes upward is formed, and the protrusion piece 5d which protrudes upward similarly is formed in the vicinity. These protruding pieces 5c and 5d are in contact with the leg portions 12b of the yoke 12 described later to determine the position of the yoke 12. Between the protrusion pieces 5d, the accommodating part 5e which accommodates the lower surface of the side part 8b of the case 8 mentioned later is formed. A pair of through-holes 5f are formed at positions corresponding to the contact portions 3b formed on the substrate 3 in the base 5. In this through hole 5f, a spring 5g as an elastic connecting member for electrically connecting the contact portion of the leaf spring of the lens holder 6 to be described later and the contact portion 3b of the substrate 3 is arranged. . The spring 5g is formed of a conductive material such as metal and has elasticity. Moreover, the pair of convex part 5h accommodated in the accommodating part 8g formed in the case 8 mentioned later is formed in the predetermined position of the side in which the protrusion 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 in the center thereof. Moreover, it has the side parts 8b and 8c which comprise a part of side surface of this lens drive apparatus 1. As shown in FIG. The side part 8b has the shape which the both ends entered into the inside of the apparatus main body, and the projection 8d which positions the leg part 12 of the yoke 12 mentioned later is formed in the surface of the side part 8b. . Moreover, the notch part 8e opened toward the upper side is formed in the center part. On the other hand, the side surface part 8c is provided with the notch part 8f opened toward the upper side in the center part, the accommodation part 8g which accommodates the convex part 5h of the base 5, and the cover mentioned later ( The groove part 8h which accommodates the convex part 9h of 9 is formed. Moreover, the pin 8i which protrudes upwards is formed in the four corners of the case 8 vertically.

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. The small diameter part 7a is formed with the opening part 7c which functions as a light entrance port in the upper surface. Moreover, the some recessed part 7d for lens position fine adjustment hold | maintained is formed in the upper end part of the peripheral surface of the small diameter part 7a. The screw thread 7e is formed in the upper side of the circumferential surface of the large diameter part 7b. The screw thread 7e is engaged with the screw thread formed in the inner peripheral surface of the lens holder 6 mentioned later, and is used at the time of position adjustment of the lens case 7 itself.

The lens holder 6 is configured by combining a plurality of parts. In a state where a plurality of parts are combined, the lens case 7 is held in a space formed therein so as to be able to be adjusted up and down. The lens holder 6 is configured to fix an end portion of a leaf spring, which is a component part, to the case 8 and to swing the center portion thereof up and down with respect to the case 8. The coil 10 having an annular shape is fixed to the upper surface of the lens holder 6. For example, the coil 10 is adhesively fixed to the upper surface of the lens holder 6. In addition, the detailed structure of this lens holder 6 is mentioned later.

The cover 9 has a shape corresponding to the upper surface of the case 8, and a circular opening 9a is formed in the center thereof. Moreover, it has a pair of sides 9b corresponding to the side part 8b of the case 8, and a pair of sides 9c corresponding to the side part 8c. In the side 9b, while engaging with the side part 8b at the lower end, the engaging part 9d which engages with the bracket 12a of the yoke 12 mentioned later at the upper end is formed. In the engagement portion 9d, the convex portion 9e to be engaged with the notch portion 8e of the case 8 is formed, and the holding piece 9f holding the side surface of the bracket 12a of the yoke 12 is provided. ) Is formed. On the other hand, on the side 9c, the convex part 9g which engages with the notch part 8f of the case 8, the convex part 9h which enters the groove part 8h of the case 8, and the case 8 The convex part 9i which enters the accommodating part 8g of () is formed. In addition, the four corners of the cover 9 are provided with hole portions 9j through which the pins 8i of the case 8 penetrate.

The magnet 11 is fixed to the inner wall surface of the yoke 12. The magnet 11 has a ring shape with a diameter larger than that of the coil 10. In the state fixed to the yoke 12, it is arrange | positioned so that the circumference | surroundings of the coil 10 fixed to the upper surface of the lens holder 6 may be wrapped. The inner circumferential surface of the magnet 11 opposes the outer circumferential surface of the coil 10 in a state separated by a predetermined distance. In addition, 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 has a circular ring shape that functions as a magnetic body and has a shape that is opened downward in FIG. 1. Moreover, it is fixed to the bracket 12a in the lower end part. The bracket 12a is bent downward at the four corners, and the bent portion constitutes the leg portion 12b. The leg part 12b has the notch part 12c opened downward. The notch part 12c accommodates the projection 8d of the case 8. In the end face corresponding to the side 9b of the cover 9 in the bracket 12a, a engaging portion 12d is engaged with the holding piece 9f of the cover 9.

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

In the state which assembled the lens drive apparatus 1, as shown in FIG.2 and FIG.3, the case 8 is overlapped above the base 5. As shown in FIG. At this time, as shown in FIG. 2, while the lower surface of the side part 8b of the case 8 is accommodated in the accommodating part 5e of the base 5, the convex part 5h of the base 5 is a case ( It is accommodated in the accommodating part 8g of 8). Thereby, the position of the case 8 on the base 5 is determined.

2 and 3, the cover 9 overlaps with the case 8 above. At this time, as shown in FIG. 2, while the convex part 9e of the cover 9 is accommodated in the notch part 8e of the case 8, the convex part 9g, the convex part 9h, and the convex part 9i is accommodated in the notch part 8f, the groove part 8h, and the accommodating part 8g, respectively. Thereby, the position of the cover 9 on the case 8 is determined.

2 and 3, the yoke 12 overlaps the upper portion of the cover 9. At this time, as shown in FIG. 2, the engaging part 12d of the bracket 12a of the yoke 12 is hold | maintained by the holding piece 9f of the cover 9. As shown in FIG. The leg part 12b of the bracket 12a is arrange | positioned in the space formed by the protrusion pieces 5c and 5d of the base 5, and the side part 8c of the case 8. In this case, the projection 8d formed in the side portion 8b of the case 8 is accommodated in the notch portion 12c formed in the leg portion 12b. Thereby, the position of the yoke 12 on the cover 9 is determined.

As shown in FIG. 3, the yoke 12 has a substantially U-shaped cross section, and inside the magnet 11, the magnet 11 is adhesively fixed to an inner wall surface of the outer side thereof. And the coil 10 fixed to the lens holder 6 is arrange | positioned between the inner peripheral surface of this magnet 11 and the inner wall surface of the inside of the yoke 12. As shown in FIG. The coil 10 is arrange | positioned in the position spaced apart from the inner peripheral surface of the magnet 11 and the inner wall surface of the inside of the yoke 12 by a fixed distance.

Moreover, the lens drive part which moves the lens holder 6 and the lens case 7 is comprised by such a coil 10, the magnet 11, and the yoke 12. As shown in FIG. In the present embodiment, the lens driving unit is composed of a so-called voice coil motor. In particular, in this embodiment, the case where the moving coil type voice coil motor which moves the coil 10 along the magnet 11 by the electricity supply to the coil 10 is applied is shown.

3, the lens case 7 is arrange | positioned inside the yoke 12. As shown in FIG. And while the IR cut filter 4 is arrange | positioned in the downward position corresponding to the some lens hold | maintained by the lens case 7, the imaging area | region of the image sensor 2 in the downward position of this IR cut filter 4 2a) is arranged.

Hereinafter, the component which has the characteristic of the lens drive apparatus 1 which concerns on this embodiment is demonstrated. In the lens driving apparatus 1 according to the present embodiment, the structures of the substrate 3, the base 5, the lens holder 6, and the case 8 are characterized by the above-described configuration. I shall do it.

First, the structure of the board | substrate 3 which the lens drive device 1 which concerns on this embodiment has is demonstrated. 4 is a top view of the substrate 3 of the lens drive device 1 according to the present embodiment. As shown in FIG. 4, the board | substrate 3 is provided with the some external connection member 3a (6 here) in one side of the left side shown in the same figure. And on three sides other than one side in which this external connection member 3a was formed, the some terminal 3c for electrically connecting the image sensor 2 in the vicinity of an outer edge part is formed.

As mentioned above, a pair of contact part 3b is formed in the vicinity of the external connection member 3a. In particular, the contact part 3b is formed so that it may be arrange | positioned between the external connection member 3a and the external connection member 3a, respectively. Thus, it is formed in order to arrange | position between the external connection member 3a and the external connection member 3a, in order to ensure the space where the image sensor 2 on the board | substrate 3 will be arrange | positioned. Further, as will be described later in detail, in order to prevent the intrusion of dust or the like into the image sensor 2, to form the wall portion formed on the back side of the base 5 on the outer side of the base 5 as much as possible. to be.

Next, the structure of the base 5 which the lens drive device 1 which concerns on this embodiment has is demonstrated. FIG. 5: is a perspective view for demonstrating the relationship of the board | substrate 3 and the base 5 which the lens drive apparatus 1 which concerns on this embodiment has. 6 is a bottom view of the base 5 of the lens drive device 1 according to the present embodiment. In addition, in FIG. 5, only the board | substrate 3 and the base 5 are extracted, and it is an exploded perspective view seen from the downward side.

As shown in FIG. 5 and FIG. 6, a space 5i is formed on the rear surface of the base 5, which functions as a housing portion for storing the image sensor 2 fixed to the substrate 3. In the space 5i, a plurality of elastic support pieces 5j are formed to lightly elastically support the image sensor 2. Moreover, the outer edge part 5k is formed around the space 5i. The outer edge portion 5k has a recessed portion 5l that has entered the inside of the base 5 at a position corresponding to the through hole 5f. The inner wall of the concave portion 5l serves as a wall portion for preventing dust or the like from entering the image sensor 2 via the through hole 5f.

When the board | substrate 3 and the base 5 which have such a structure are assembled, the spring 5g is arrange | positioned and formed in the through-hole 5f formed in the base 5, as shown in FIG. In this case, the lower end 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 5g projects slightly upward from the upper surface of the base 5.

In the lens drive 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 part of the leaf spring which the lens holder 6 has is in contact with the upper end of the spring 5g which slightly protrudes from the through hole 5f of the base 5. FIG. 8 is a perspective view for explaining a state where the end of the leaf spring of the lens holder 6 is in contact with the upper end of the spring 5g. In addition, in FIG. 8, the case 8 in which the lens holder 6 is fixed is abbreviate | omitted for convenience of description. As shown in FIG. 8, the lens holder 6 has two leaf springs, and the ends (A and B shown in the same figure) of the different leaf springs respectively contact the upper end portions of the different springs 5g.

Next, the structure of the lens holder 6 which the lens drive device 1 which concerns on this embodiment has is demonstrated. FIG. 9 is an exploded perspective view of the lens holder 6 included in the lens driving apparatus 1 according to the present embodiment, and FIG. 10 shows the lens holder 6 included in the lens driving apparatus 1 according to the present embodiment. It is a perspective view when assembling. 11 is a top view when the lens holder 6 included in the lens driving apparatus 1 according to the present embodiment is assembled. In addition, in FIG. 9, the coil 10 fixed to the lens holder 6 is shown for convenience of description.

As shown in FIGS. 9 and 10, the lens holder 6 includes an upper surface portion 61, a first leaf spring 62, a spacer 63, a second leaf spring 64, and a lower surface portion ( 65) is configured in combination. An opening part is formed in the center part of each component part, and as shown in FIG. 10, the space which accommodates the lens case 7 is formed inside the lens holder 6 in a state where each component part is combined. In the state hold | maintained by such the lens holder 6, the small diameter part 7a of the lens case 7 will be in the state which protruded upward from the opening part of the upper surface part 61 shown in FIG.

As shown in FIG. 9, the upper surface part 61 is the apparatus side from the lower end part of the cover part 61a which covers the upper surface vicinity of the large diameter part 7b of the lens case 7, and the lower end part of the cover part 61a in the inner wall surface. It has a flange part 61b which protruded. The upper surface of the cover portion 61a functions as the upper surface of the lens holder 6 itself, and the coil 10 described above is adhesively fixed. A pair of notch parts 61c are formed in the predetermined position of the cover part 61a. Moreover, the screw thread 61d which engages with the screw thread 7e formed in the lens case 7 is formed in the inner wall of the cover part 61a. At a predetermined position of the flange portion 61b, a pair of protrusions 61e protruding toward the apparatus side are formed. The protrusion 61e is provided with a hole 61f into which the pin 63c of the spacer 63 to be described later is inserted. Moreover, the some notch part 61g which the projection part 63d of the spacer 63 mentioned later enters in the predetermined position of the outer peripheral surface in the flange part 61b is formed. Moreover, the protrusion part 61h which enters into the notch part 63f of the spacer 63 mentioned later is formed in the predetermined position of the inner peripheral side of the lower surface in the flange part 61b.

The first leaf spring 62 is made of a conductive material such as phosphor bronze, for example. The 1st leaf spring 62 has the circular-shaped part 62a which has an opening part in the center, the some arm part 62b extended from the predetermined position of this circular-shaped part 62a, and each arm part 62b. Has a fixing portion 62c formed at an end portion thereof. A contact portion 62d in contact with the spring 5g housed 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 the portion extending from the fixing portion 62c substantially vertically downward, and further bending its tip approximately vertically inside the apparatus. In the contact portion 62d, a hole portion 62e into which the pin 8l of the case 8 described later enters is formed. On the outer circumferential 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, the notch part 62g is formed in the position corresponding to the projection part 61h of the upper surface part 61 in the inner peripheral side of the annular part 62a. Moreover, the clamping part 62h which clamps the edge part (10a shown in FIG. 10) of the coil 10 is formed in the predetermined position on the outer peripheral side of the circular-shaped part 62a.

The spacer 63 has a ring-shaped portion 63a having an opening in the center. By this ring-shaped portion 63a, the lens holder is spaced apart from the first plate spring 62 and the second plate spring 64 by a predetermined interval, that is, an interval corresponding to the thickness dimension of the ring-shaped portion 63a. It is arranged in (6). At a predetermined position on the upper surface side of the annular portion 63a, a pair of protrusions 63b protruding toward the apparatus side are formed. The protrusion 63b is provided with a pin 63c that enters the hole 61f of the upper surface portion 61. At a predetermined position on the outer circumferential side of the annular portion 63a, a projection portion 63d that enters the notch portion 61g of the upper surface portion 61 is formed. Moreover, the some notch part 63e which the projection part 65d of the lower surface part 65 mentioned later enters in the predetermined position of the outer peripheral side of the lower surface of the ring-shaped part 63a is formed. On the other hand, the some notch part 63f which enters the projection part 61h of the upper surface part 61 is formed in the predetermined position on the inner peripheral side of the annular part 63a. Moreover, the pair of protrusion parts 63g which protruded toward the apparatus side are formed in the predetermined position of the lower surface side of the ring-shaped part 63a. In the protruding portion 63g, a pin 63h that enters the hole 65c of the lower surface portion 65 to be described later is formed.

The second leaf spring 64 is made of a conductive material such as phosphorus bronze, for example, like the first leaf spring 62. The 2nd leaf spring 64 has the circular-shaped part 64a which has an opening part in the center, the some arm part 64b extended from the predetermined position of this circular-shaped part 64a, and each arm part 64b. Has a fixing portion 64c formed at the end of the. The contact portion 64d in contact with the spring 5g housed in the through hole 5f of the base 5 is connected to the specific fixing portion 64c. The contact portion 64d is formed by bending the portion extending from the fixing portion 64c substantially vertically to the lower side, and further bending the tip end thereof substantially vertically inside the apparatus. In the contact portion 64d, a hole 64e into which the pin 8l of the case 8 described later enters is formed. On the outer peripheral side of the annular portion 64a, a notch portion 64f is formed at a position corresponding to the protrusion 65d of the lower surface portion 65 described later. On the other hand, the notch part 64g is formed in the position corresponding to the projection part 65e of the lower surface part 65 mentioned later on the inner peripheral side of the circular-shaped part 64a. Moreover, the clamping part 64h which clamps the edge part (10b shown in FIG. 10) of the coil 10 is formed in the predetermined position on the outer peripheral side of the circular-shaped part 64a.

The lower surface portion 65 has a ring-shaped portion 65a having an opening in the center. At a predetermined position of the annular portion 63a, a pair of protrusions 65b protruding toward the apparatus side are formed. The protruding portion 65b is provided with a hole portion 65c into which the pin 63h of the spacer 63 is inserted. At a predetermined position on the outer circumferential side of the upper surface in the annular portion 65a, a projection 65d that enters the notch portion 63e of the spacer 63 is formed. Moreover, the projection part 65e which enters the notch part 63f of the spacer 63 is formed in the predetermined position of the inner peripheral side of the upper surface in the ring-shaped part 65a.

As shown in FIG. 10, the lens holder 6 inserts the pin 63c formed in the spacer 63 into the hole 61f of the upper surface portion 61 with the first leaf spring 62 interposed therebetween. On the other hand, the pin 63h formed in the spacer 63 is inserted into the hole 65c of the lower surface portion 65 with the second leaf spring 64 interposed therebetween. Then, for example, the projection 63d formed on the spacer 63, the notch 61g formed on the upper surface 61, and the like are bonded and fixed, while the projections 65d formed on the lower surface 65, etc., the spacer The component parts are configured to be integrated by adhesively fixing the notches 63e and the like formed on the 63. In this case, as shown in FIG. 11, the fixing part 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. Thus, the first leaf spring 62 and the second leaf spring 64 can be mounted from one direction.

In addition, although the case where the lens holder 6 is integrated by the adhesive fixation of a projection part and the notch part is shown here, the structure which integrates the lens holder 6 is not limited to this, It can change suitably. As long as the integration of the lens holder 6 can be realized, any method may be employed. For example, while forming the component which consists of the upper surface part 61, the 1st leaf spring 62, and the spacer 63 by in-mold molding, it consists of the 2nd leaf spring 64 and the lower surface part 65. The parts may be formed by in-mold molding, and these may be adhesively fixed. Alternatively, all parts from the upper surface portion 61 to the lower surface portion 65 may be formed by in-mold molding.

When assembled in this way, as shown in FIG. 10, the 1st leaf spring 62 and the 2nd leaf spring 64 which the lens holder 6 has are located in the position of the different height in the lens holder 6 Is placed. Moreover, as shown in FIG. 11, the fixing part 62c of the 1st leaf spring 62 and the fixing part 64c of the 2nd leaf spring 64 differ in the circumferential direction in the lens holder 6 Are arranged so that they do not overlap from above. The fixing portion 62c and the fixing portion 64c are disposed close to each other at four corners of the lens holder 6. As shown in FIG. 11, the notch part 62i and the notch part 64i which receive the pin 8i perpendicularly formed in the case 8 are formed in the fixing part 62c and the fixing part 64c, respectively. Such notches 62i and notches 64i have a circular shape when viewed from above.

Next, the structure of the case 8 which the lens drive device 1 which concerns on this embodiment has is demonstrated. 12 is a perspective view of a case 8 of the lens drive device 1 according to the present embodiment. In addition, in FIG. 12, about the structure similar to FIG. 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 12, the pin 8i is vertically formed in four corners on the upper surface of the case 8. The vicinity of this pin 8i is a step in accordance with the position of the fixing portion 62c of the first leaf spring 62 of the lens holder 6 and the fixing portion 64c of the second leaf spring 64. It is formed in the shape which has. The size of this step is a dimension corresponding to the thickness of the annular portion 63a of the spacer 63. Specifically, it is arrange | positioned in the position higher than the 1st fixing part 8j and the 1st fixing part 8j according to the position of the fixing part 64c of the 2nd leaf spring 64, and the 1st leaf spring 62 The second fixing part 8k is formed in accordance with the position of the fixing part 62c.

Here, the relationship between the case 8, the fixing part 62c of the 1st leaf spring 62, and the fixing part 64c of the 2nd leaf spring 64 is demonstrated. FIG. 13 is a perspective view for explaining the relationship between the case 8 and the fixing portion 64c of the second leaf spring 64, and FIG. 14 is a fixing portion of the case 8 and the first leaf spring 62 (FIG. It is a perspective view for demonstrating the relationship of 62c).

As shown in FIG. 13, each fixing part 64c which the 2nd leaf spring 64 has is fixed to the 1st fixing part 8j. In this case, the fixing portion 64c is fixed with the notch portion 64i accommodating the pins 8i. Thus, by fixing the pin 8i in the state which accommodated the notch 64i, the 2nd leaf spring 64 is prevented from shifting | deviating from the case 8. As shown in FIG. In this case, the annular portion 64a of the second leaf spring 64 is disposed inside the opening 8a of the case 8.

On the other hand, as shown in FIG. 14, each fixing part 62c which the 1st leaf spring 62 has is fixed to the 2nd fixing part 8k. In this case, the fixing part 62c is fixed with the notch part 62i accommodating the pin 8i. Thus, by fixing the pin 8i in the state which accommodated the notch 62i, the 1st leaf | plate spring 62 is prevented from shifting | deviating from the case 8. As shown in FIG. In this case, the annular portion 62a of the first leaf spring 62 is disposed inside the opening 8a 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 apparatus 1 according to the present embodiment. As described above, the lens holder 6 is integrated with the first leaf spring 62 and the second leaf spring 64 between the upper surface portion 61, the spacer 63, and the lower surface portion 65. Only the first leaf spring 62 and the second leaf spring 64 are fixed to the case 8. For this reason, the lens holder 6 is comprised so that it can rock to the up-down direction shown in FIG. 15 in the fixed range which the 1st leaf spring 62 and the 2nd leaf spring 64 allow. The 1st leaf spring 62 and the 2nd leaf spring 64 are attached to the case 8, maintaining the space | interval separated by the spacer 63. As shown in FIG. For this reason, when the lens holder 6 oscillates with respect to the case 8 in the up-down direction, the 1st leaf spring 62 and the 2nd leaf spring 64 are not electrically shorted.

Moreover, in the case where it is fixed to the case 8 in this way, the contact part 62d and the contact part 64d of the 1st leaf spring 62 and the 2nd leaf spring 64 which the lens holder 6 has are It is enclosed by the back surface side of the case 8 through the receiving part 8g formed in the case 8. FIG. 16 is a perspective view when the lens holder 6 and the case 8 shown in FIG. 15 are seen from the lower surface side. As shown in FIG. 16, on the back surface of the case 8, the contact part 62d and the contact part 64d extend to the side part 8b side along the opening part 8a. A pin 8l formed on the lower surface of the case 8 is engaged with the hole portion 62e and the hole portion 64e respectively formed in the contact portion 62d and the contact portion 64d. This prevents the contact portion 62d and the contact portion 64d from shifting from the predetermined position of the case 8. In this way, the contact portion 62d and the contact portion 64d enclosed on the back surface side of the case 8 come into contact with the upper end portion of the spring 5g housed in the through hole 5f of the base 5 (see FIG. 8). ).

In the lens drive device 1 according to the present embodiment, the lens held therein is driven by moving the lens case 7 up and down. Hereinafter, the control in the case of moving the lens case 7 up and down in the lens drive device 1 according to the present embodiment will be described.

In the lens driving apparatus 1 according to the present embodiment, when the lens case 7 is moved up and down, for example, driving from a control unit of a mobile phone or a digital camera on which the lens driving apparatus 1 is mounted. According to the instruction, a current flows through the coil 10. At this time, in this lens drive apparatus 1, the 1st leaf spring 62 and the 2nd leaf spring 64 are used as the electricity supply means. Specifically, from the contact part 3b of the board | substrate 3, the spring 5g embedded in the base 5, the contact part 62d in the 1st leaf spring 62, the fixing part 62c, An electric current is sent to the coil 10 via the arm part 62b, the annular part 62a, and the clamping part 62h. And the electric current which flowed through the coil 10 is 64 g of clamping parts in the 2nd leaf spring 64, circular-shaped part 64a, arm part 64b, fixing part 64c, and contact part ( It is sent out to the board | substrate 3 through the spring 5g embedded in 64d) and the base 5.

When current flows through the coil 10 in this manner, the current flowing through the coil 10 acts on the magnetic field generated from the magnet 11, thereby generating a thrust for moving the coil 10 in the vertical direction. In the lens drive device 1 according to the present embodiment, the thrust is controlled by controlling the amount of current flowing through the coil 10, and the coil 10 is moved up and down to determine its position. Thereby, while determining the position of the lens holder 6 to which the coil 10 is fixed, it becomes possible to determine the position of the lens in the lens case 7 attached to the lens holder 6.

As described above, according to the lens driving apparatus 1 according to the present embodiment, the fixing portion 62c of the first leaf spring 62 with respect to the case 8 is fixed to the fixing portion 64c of the second leaf spring 64. The first leaf spring 62 and the second leaf spring are formed by providing a step in the first fixing portion 8j and the second fixing portion 8i in the case 8 while being disposed at a position different from Since 64 can be attached from one direction, the workability at the time of assembling an apparatus main body can be improved.

In the lens drive device 1 according to the present embodiment, the first leaf spring 62 is disposed between the case 8 functioning as the first member and the cover 9 functioning as the second member. Since the fixing portion 62c and the fixing portion 64c of the second leaf spring 64 are fixed to be sandwiched therebetween, the space between the first leaf spring 62 and the second leaf spring 64 is securely ensured. It can be arranged in a maintained state. For this reason, when the 1st leaf spring 62 and the 2nd leaf spring 64 are used as an energization means with respect to the coil 10, the 1st leaf spring 62 and the 2nd leaf spring 64 are not short-circuited. It can be used reliably as a power supply means.

In addition, this invention is not limited to the said embodiment, A various change can be implemented. In the above embodiment, the size, shape, and the like shown in the accompanying drawings are not limited thereto, and can be appropriately changed within the range in which the effects of the present invention are exhibited. In addition, it can change suitably and can implement unless it deviates from the range of the objective of this invention.

For example, in the said embodiment, although the lens holder 6 has two leaf springs (the 1st leaf spring 62 and the 2nd leaf spring 64), it shows not only the lens holder 6 ) Does not have to have them. In the same manner as in the above embodiment, the lens holder 6 and the two leaf springs may be different components, provided that the two leaf springs are disposed at positions of different heights. The number of leaf springs is not limited to two, but may be set to three or more.

1 is an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention.

2 is a perspective view when the lens driving device according to the embodiment is assembled.

3 is a cross-sectional view when a lens driving device according to the embodiment is assembled.

4 is a top view of a substrate of the lens driving apparatus according to the embodiment.

5 is a perspective view for explaining the relationship between the substrate and the base of the lens driving apparatus according to the embodiment.

6 is a bottom view of the base of the lens drive device according to the embodiment.

7 illustrates a substrate and a base of the lens driving apparatus according to the above embodiment.

It is a perspective view of an overlapping state.

It is a perspective view for demonstrating the state which the leaf spring which the lens holder which the lens drive apparatus which concerns on the said embodiment has in contact with a spring.

9 is an exploded perspective view of the lens holder of the lens drive device according to the above embodiment.

10 is a perspective view when the lens holder of the lens drive device according to the above embodiment is assembled.

11 is a top view when the lens holder of the lens drive device according to the embodiment is assembled.

It is a perspective view of the case which the lens drive apparatus which concerns on the said embodiment has.

It is a perspective view for demonstrating the relationship of the case which the lens drive device which concerns on the said embodiment has, and the fixed part of a 2nd leaf spring.

It is a perspective view for demonstrating the relationship of the case which the lens drive device which concerns on the said embodiment has, and the fixed part of a 1st leaf spring.

It is a perspective view for demonstrating the relationship of the lens holder and case which the lens drive apparatus which concerns on the said embodiment has.

FIG. 16 is a perspective view when the lens holder and the case shown in FIG. 15 are viewed from the lower surface side. FIG.

<Explanation of symbols for main parts of drawing>

1: lens driving device 2: image sensor

3: board | substrate 3b: contact part

4: IR cut filter 5: Base member (base)

6: lens holder 61: upper surface

62: first leaf spring 62d: contact portion

63: spacer 64: second plate spring

64d: contact portion 65: lower surface portion

7: lens case 8: case

9: cover 10: coil

11: magnet 12: York

Claims (3)

A lens holder for holding the lens, a case in which the lens holder is mounted, and a plurality of leaf springs for movably connecting the lens holder with respect to the case; While arrange | positioning in the position different from the fixed part of the said leaf spring, a step is formed in the fixed part of the said leaf spring in the said case, and the fixed part of the said leaf spring different from the fixed part of the said leaf spring forms a step | step The lens drive device characterized in that the arrangement. The method of claim 1, And the case is composed of a first member and a second member, and the fixing portion of the leaf spring is held in a state sandwiched between the first member and the second member. The method of claim 1, A lens driving device, characterized in that the fixing portion of the leaf spring is formed in the corner of the case.

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