JP6238236B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device, and more particularly to a lens driving device in which a lens holding member capable of holding a lens body is held by a leaf spring.

  Nowadays, there are many portable devices equipped with a still image and video shooting function. Such a portable device has a built-in lens driving device for driving the lens body in order to automatically focus the photographed image when photographing the subject. As a lens driving device used for a portable device, a lens driving device described in Patent Document 1 below is known.

  Hereinafter, the lens driving device described in Patent Document 1 will be described with reference to FIGS. 19 and 20. FIG. 19 is an exploded perspective view showing the configuration of the lens driving device 900 described in Patent Document 1. As shown in FIG. FIG. 20 is a perspective view showing an appearance of the elastic member 911 in the lens driving device 900 described in Patent Document 1.

  As shown in FIG. 19, the lens driving device 900 described in Patent Literature 1 includes a base member 901, a yoke 908, a lens holding member (lens holding body 903), a coil 904, a magnet 905, and an elastic member 911. When the coil 904 is energized, the lens holder 903 moves in the optical axis direction. The elastic member 911 includes a lower leaf spring 906 and an upper leaf spring 907 as shown in FIG. The lower leaf spring 906 has a base portion 906a and an attachment portion 906c, and one end side of the base portion 906a and one end side of the attachment portion 906c are formed in a linear shape folded back in multiple stages. The other end side of the base part 906a and the other end side of the attachment part 906c are similarly connected by the lower spring part 906e. The upper leaf spring 907 has the same structure as the lower leaf spring 906. In the lower leaf spring 906, the base portion 906a is fixed to the base member 901, and the attachment portion 906c is locked to the lens holding body 903 to hold the lens holding body 903 so as to be movable in the optical axis direction.

Utility Model Registration No. 3179634

  The lens driving device 900 is desired to change the position of the lens holder 903 linearly when the coil 904 is energized. That is, the linearity of the position change of the lens holder 903 is required to be good. However, in the lens driving device 900, the lower spring portion 906e of the lower leaf spring 906 is formed in a line shape that is folded back in multiple stages, and has the same cross-sectional area before and after the folding, but the length is different. The spring constant is different before and after. For this reason, when the lens holder 903 moves in the optical axis direction, the spring constant of the lower leaf spring 906 changes, and there is a problem that the linearity of the displacement of the lens holder 903 is poor.

  The present invention solves the above-described problems and provides a lens driving device that can improve the linearity of the displacement of the position of the lens holding member.

  The lens driving device of the present invention includes a lens holding member capable of holding a lens body, and an upper leaf spring and a lower leaf spring that are partially fixed to the lens holding member and support the lens holding member so as to be movable in the optical axis direction. A support member to which other parts of the upper plate spring and the lower plate spring are fixed, and a moving mechanism configured to include at least a magnet and a coil that move the lens holding member along the optical axis direction. In the lens driving device, the upper leaf spring and the lower leaf spring include a spring portion having at least one folded portion and a plurality of arm portions connected to the folded portion between the part and the other portion. And at least one of the upper leaf spring and the lower leaf spring has a plurality of arm portions having different lengths, and a cross-sectional area of a long arm portion is a cross-sectional area of a short arm portion. Bigger than that And butterflies.

  Thereby, even if the lengths of the arm portions are different, the cross-sectional area of the long arm portion is made larger than the cross-sectional area of the short arm portion, so that the spring constants of the plurality of arm portions are the same. It can be close to the value. For this reason, the spring constant of the spring portion is hardly changed at the position of the lens holding member in the optical axis direction, and the linearity of the displacement of the lens holding member when the coil is energized can be improved.

  Further, in the lens driving device according to the present invention, the long arm portion and the short arm portion have the same thickness dimension, and the width dimension of the long arm portion is set to the length. It is characterized by being thicker than the width of the short arm portion.

  This makes it possible to adjust the cross-sectional area by fixing the thickness dimension and changing the cross-sectional area by changing the width dimension, making it easier to adjust the cross-sectional area by changing the thickness dimension for each part. Adjustments can be made.

  Further, in the lens driving device according to the present invention, the long arm part is directed from one end part away from the short arm part toward the other end part located on the short arm part side. The width dimension is gradually narrowed.

  Thereby, it was set as the structure where an arm part with a long length gradually narrows a width dimension toward the other end part side located in the arm part side with a short length from one end part. By adopting such a structure, the spring constant of the long arm part and the spring constant of the short arm part are brought close to the same value, and the width dimension of the long arm part side of the folded part is A difference from the width dimension on the side of the short arm portion can be reduced. Therefore, there is no place where the width dimension changes suddenly, and it is possible to make it difficult to break due to stress concentration.

  The lens driving device according to the present invention is characterized in that the long arm portion extends so as to meander.

  Thereby, by extending the arm part having a long length so as to meander, it becomes possible to secure a longer arm part in a limited region, and the arm part having a long length can be secured. It is possible to easily adjust the spring constant and the spring constant of the short arm portion so as to approach the same value.

  Further, in the lens driving device according to the present invention, both the upper leaf spring and the lower leaf spring have different lengths of the plurality of arm portions, and the cross-sectional area of the long arm portion is set to the long length. The cross sectional area of the short arm portion is larger.

  As a result, the spring constants of the spring portions of both leaf springs are less likely to change depending on the position of the lens holding member in the optical axis direction, further improving the linearity of the displacement of the lens holding member when the coil is energized. Can be made.

  According to the present invention, the spring constant of the spring portion is hardly changed at the position of the lens holding member in the optical axis direction, and the linearity of the displacement of the lens holding member when the coil is energized can be improved.

It is a perspective view which shows the external appearance of the lens drive device 100 in 1st Embodiment. It is a disassembled perspective view which shows the structure of the lens drive device 100 in 1st Embodiment. FIG. 3 is a diagram showing a lens holding member 1 in the first embodiment, FIG. 3A is a perspective view showing an appearance of the lens holding member 1, and FIG. 3B is a Z2 direction shown in FIG. FIG. 3C is a perspective view showing the lens holding member 1 as seen from the side, and FIG. 3C is a view of the lens holding member 1 holding the lens body LE as seen from the X2 direction side shown in FIG. It is a schematic side view which shows. It is a figure which shows the lens holding member 1 by which the coil 6 in 1st Embodiment was wound along the outer periphery, FIG.4 (a) is a perspective view which shows the external appearance of the lens holding member 1 by which the coil 6 was wound. FIG. 4B is a perspective view showing the appearance of the lens holding member 1 around which the coil 6 is wound as viewed from the Z2 direction side shown in FIG. It is a perspective view which shows the external appearance of the elastic member 10 in 1st Embodiment. FIG. 6A is a view showing the upper leaf spring 2 in the first embodiment, and FIG. 6A is a plan view showing the upper leaf spring 2 as viewed from the Z1 direction side shown in FIG. 5, and FIG. These are the enlarged views which expanded and showed the A section as described in Fig.6 (a). It is a figure which shows the cover member 9 in 1st Embodiment, Fig.7 (a) is a perspective view which shows the external appearance of the cover member 9, FIG.7 (b) is from the Z2 direction side as described in Fig.7 (a). It is a perspective view which shows the cover member 9 of the state seen. It is a figure which shows the yoke 7 in 1st Embodiment, Fig.8 (a) is a perspective view which shows the external appearance of the yoke 7, FIG.8 (b) was seen from the Z2 direction side as described in Fig.8 (a). It is a top view which shows the yoke 7 of a state. FIGS. 9A and 9B are views showing the base member 8 in the first embodiment, FIG. 9A is a perspective view showing the appearance of the base member 8, and FIG. 9B is a view of the metal member 4 embedded in the base member 8. FIG. It is a schematic perspective view which shows an external appearance. It is explanatory drawing shown about the engagement method of the upper leaf | plate spring 2, the cover member 9, and the yoke 7 in 1st Embodiment, Fig.10 (a) is a decomposition | disassembly which shows the positional relationship of the upper leaf | plate spring 2, the cover member 9, and the yoke 7. FIG. FIG. 10B is a perspective view showing a state in which the upper leaf spring 2, the cover member 9, and the yoke 7 are integrally formed. It is explanatory drawing shown about the fixing method of the magnet 5 in 1st Embodiment, Fig.11 (a) is a disassembled perspective view which shows the positional relationship of the magnet 5 and the yoke 7, FIG.11 (b) is the magnet 5 used as a yoke. 7 is a plan view showing a state of being fixed to the inside of FIG. It is explanatory drawing shown about the fixing method to the lens holding member 1 of the lower leaf | plate spring 3 in 1st Embodiment, Fig.12 (a) is an exploded perspective view which shows the positional relationship of the lower leaf | plate spring 3 and the lens holding member 1. FIG. FIG. 12B is a perspective view showing a state in which the lower leaf spring 3 is fixed to the lens holding member 1. FIG. 13A is an enlarged view showing a portion B shown in FIG. 12, and FIG. 13A is an enlarged side view showing the portion B as viewed from the X2 direction side shown in FIG. ) Is an enlarged plan view showing a portion B as seen from the Z2 direction side shown in FIG. It is explanatory drawing shown about the fixing method to the base member 8 of the lower leaf | plate spring 3 in 1st Embodiment, Fig.14 (a) is an exploded perspective view which shows the positional relationship of the lower leaf | plate spring 3 and the base member 8, FIG. 14B is a perspective view showing a state in which the lower leaf spring 3 is fixed to the base member 8. FIGS. 15A and 15B are explanatory views showing a fixing method between the yoke 7 and the base member 8 and a fixing method between the lens holding member 1 and the upper leaf spring 2 in the first embodiment. FIG. FIG. 15B is a perspective view showing a state in which the yoke 7 and the base member 8 are fixed and a state in which the lens holding member 1 and the upper leaf spring 2 are fixed. . FIG. 2 is a schematic cross-sectional view schematically showing a cross section of the lens driving device 100 cut along a diagonal line when the lens driving device 100 shown in FIG. 1 is viewed in plan from the Z1 direction side shown in FIG. 1. It is a figure which shows the lower leaf | plate spring 32 in 2nd Embodiment, Fig.17 (a) is a top view which shows the external appearance of the lower leaf | plate spring 32, FIG.17 (b) is C section as described in Fig.17 (a). It is an enlarged view which expands and shows. FIG. 18A is a view showing a modification of the shape of the spring portion SP, FIG. 18A is a plan view showing a modification of the shape of the elastic member 10, and FIG. 18B is a D portion shown in FIG. It is an enlarged view which expands and shows. It is a disassembled perspective view which shows the structure of the lens drive device 900 of patent document 1. FIG. 10 is a perspective view showing an appearance of an elastic member 911 in a lens driving device 900 described in Patent Document 1. FIG.

[First Embodiment]
The lens driving device 100 in the first embodiment will be described below.

  First, the configuration of the lens driving device 100 according to the first embodiment will be described with reference to FIGS. 1 to 9. FIG. 1 is a perspective view showing an appearance of the lens driving device 100 according to the first embodiment. FIG. 2 is an exploded perspective view showing the configuration of the lens driving device 100 according to the first embodiment. FIG. 3 is a view showing the lens holding member 1 in the first embodiment, FIG. 3A is a perspective view showing the appearance of the lens holding member 1, and FIG. 3B is shown in FIG. FIG. 3C is a perspective view showing the lens holding member 1 as viewed from the Z2 direction side, and FIG. 3C is a perspective view of the lens holding member 1 holding the lens body LE from the X2 direction side shown in FIG. It is a schematic side view which shows the state seen. FIG. 4 is a diagram showing the lens holding member 1 in which the coil 6 is wound along the outer periphery according to the first embodiment, and FIG. 4A shows the appearance of the lens holding member 1 in which the coil 6 is wound. FIG. 4B is a perspective view showing an external appearance of the lens holding member 1 around which the coil 6 in the state viewed from the Z2 direction side shown in FIG. 4A is wound. FIG. 5 is a perspective view showing an appearance of the elastic member 10 in the first embodiment. 6 is a view showing the upper leaf spring 2 in the first embodiment, and FIG. 6A is a plan view showing the upper leaf spring 2 as seen from the Z1 direction side shown in FIG. (B) is the enlarged view which expanded and showed the A section as described in Fig.6 (a). FIG. 7 is a view showing the cover member 9 in the first embodiment, FIG. 7A is a perspective view showing the appearance of the cover member 9, and FIG. 7B is Z2 shown in FIG. 7A. It is a perspective view which shows the cover member 9 of the state seen from the direction side. FIG. 8 is a view showing the yoke 7 in the first embodiment, FIG. 8 (a) is a perspective view showing the appearance of the yoke 7, and FIG. 8 (b) is the Z2 direction side described in FIG. 8 (a). It is a top view which shows the yoke 7 of the state seen from. FIG. 9 is a view showing the base member 8 in the first embodiment, FIG. 9A is a perspective view showing the appearance of the base member 8, and FIG. 9B is a metal embedded in the base member 8. 3 is a schematic perspective view showing an appearance of a member 4. FIG.

  As shown in FIG. 1, the lens driving device 100 according to the first embodiment is formed in a rectangular parallelepiped shape and includes a circular through hole. Further, as shown in FIG. 2, the lens driving device 100 includes a lens holding member 1, a support member 70, a magnet 5, a coil 6, and an elastic member 10. The support member 70 is composed of a yoke 7, a base member 8, and a cover member 9, and the elastic member 10 is composed of an upper leaf spring 2 and a lower leaf spring 3.

  The lens holding member 1 is made of a synthetic resin material and is formed in a cylindrical shape capable of holding the lens body LE as shown in FIG. The lens holding member 1 has a cylindrical portion 1a formed in a cylindrical shape. The cylindrical part 1a has a hollow opening 1b that is open at both ends. A thread for holding the lens body is formed along the inner peripheral wall of the opening 1b. In addition, four coil holding portions 1c protruding outward are provided at equal intervals on the outer peripheral surface of the cylindrical portion 1a. In the present embodiment, the cylindrical portion 1a is provided on both sides in the X1-X2 direction and on both sides in the Y1-Y2 direction. Further, an upper leaf spring arrangement portion 1d extending from the coil holding portion 1c to the upper end of the tubular portion 1a is formed on the upper portion (Z1 direction side) of the coil holding portion 1c. In addition, the lens holding member 1 has a flange portion 1e extending in a direction away from the outer peripheral surface of the end portion on the lower end side (Z2 direction side) of the cylindrical portion 1a. The eaves part 1e is provided over substantially the entire circumference of the cylindrical part 1a. A lower holding projection 1f and a winding projection 1g are formed on the end surface on the lower end side of the cylindrical portion 1a including the flange portion 1e. The lower holding projection 1f is provided in a columnar shape so as to protrude along the optical axis direction DR1 (Z1-Z2 direction) (toward the Z2 direction), and is located at a position facing the opening 1b (in FIG. 3). Two positions each on the Y1 direction side and Y2 direction side, and one position on the opposite sides of the opening 1b different from a certain position (X1 direction side and X2 direction side in FIG. 3). . Further, the winding projection 1g is aligned along the optical axis direction DR1 (toward the Z2 direction) so as to be aligned with the lower holding projection 1f provided at a position facing the opening 1b different from a certain position. ) It protrudes and is formed in a rectangular parallelepiped shape.

  The coil 6 is made of a metal wire having conductivity, and as shown in FIG. 2, has a winding portion 6a formed so as to be wound along the outer periphery of the tube, and ends on both sides of the metal wire. 6b is provided extending from the winding part 6a. In addition, the surface of the metal wire of the portion forming the winding portion 6a is covered with a non-conductive material, and the wound portions are insulated on the surface of the metal wire, and current flows through the coil. In this case, the current flows so as to circulate along the metal wire. In the first embodiment, as shown in FIG. 4, the coil 6 is formed by winding a metal wire around the coil holding portion 1 c along the outer periphery of the lens holding member 1. Since the coil holding part 1c is formed so as to protrude with respect to the outer peripheral surface of the cylindrical part 1a, the portion of the winding part 6a that is not in contact with the coil holding part 1c is between the cylindrical part 1a. There is a gap. Further, the end 6 b of the coil 6 is wound and held on the winding projection 1 g of the lens holding member 1. The tip of the end 6b of the coil 6 that is wound and held on the winding projection 1g is fixed to the winding projection 1g with an adhesive or the like, or a metal wire is embedded in the resin. In the method, care is applied to prevent the wound metal wire from fraying. At the beginning of winding, the tip of the end 6b arranged in contact with the winding projection 1g is pressed together with the winding projection 1g by winding a portion other than the tip around the tip. There may be. Further, the end portion 6b of the coil 6 wound around the winding projection 1g extends from the root side of the winding projection 1g and is connected to the winding portion 6a.

  As shown in FIGS. 2 and 5, the elastic member 10 includes two leaf springs, that is, an upper leaf spring 2 and a lower leaf spring 3. The upper leaf spring 2 and the lower leaf spring 3 are made of a thin metal plate. As shown in FIG. 5, at least one folded portion RP is provided between a part PA (see FIG. 5) and another part PB (see FIG. 5). And a spring portion SP having a plurality of arm portions AP connected to the folded portion RP. Further, at least one of the upper leaf spring 2 and the lower leaf spring 3 has a plurality of arm portions AP having different lengths, and the cross-sectional area of the long arm portion AP is shortened. It is larger than the cross-sectional area of AP. In the first embodiment, only the upper leaf spring 2 has a larger cross-sectional area of the long arm portion AP than that of the short arm portion AP. Hereinafter, the upper leaf spring 2 and the lower leaf spring 3 will be described in detail.

  As shown in FIG. 5, the upper leaf spring 2 is formed into a rectangular ring shape by sheet metal processing of a thin metal plate. The upper leaf spring 2 has an upper fixing portion 2a formed in a rectangular ring shape. The upper fixing portion 2a is a portion corresponding to the other portion PB. Upper fixing holes 2d, which are circular through holes, are formed at the four corners of the upper fixing portion 2a. The upper leaf spring 2 has an upper movable portion 2b that is disposed inside the upper fixed portion 2a and formed in a circular ring shape. The upper movable part 2b is a part corresponding to the aforementioned partial PA. The upper movable portion 2b includes an upper annular portion 2e formed in an annular shape, and an upper mounting portion 2f formed in a rectangular shape so that a part of the upper annular portion 2e protrudes outward. Yes. The upper mounting portions 2f constituting part of the PA are formed to be engageable with the upper leaf spring arrangement portion 1d of the lens holding member 1, and are formed at four locations along the upper annular portion 2e at equal intervals. In the first embodiment, they are formed at both ends in the X1-X2 direction and both ends in the Y1-Y2 direction. The upper leaf spring 2 includes a spring portion SP (hereinafter, the spring portion SP of the upper leaf spring 2 is referred to as an upper spring portion 2c) that connects the upper fixed portion 2a and the upper movable portion 2b. The upper spring portion 2c extends from the four corners of the upper fixing portion 2a and is connected to the upper mounting portion 2f disposed on the Y1 direction side or the Y2 direction side at the closest position. For example, among the four corners of the upper fixing portion 2a, the upper spring portion 2c extending from the corner on the X1 direction side and the Y2 direction side is connected to the X1 direction side of the upper mounting portion 2f formed on the Y2 direction side. Has been. The upper spring portion 2c has elasticity, and when the upper fixed portion 2a is fixed, the upper movable portion 2b formed in a circular shape passes through the center of the circle and passes on the axis SF orthogonal to the plate surface of the upper leaf spring 2. The upper fixed portion 2a and the upper movable portion 2b are connected so as to be movable along. The extending direction of the axis SF is a direction along the optical axis direction DR1 and coincides with the Z1-Z2 direction in FIG.

  Further, as shown in FIG. 6, the upper spring portion 2 c is formed of two folded portions RP and three arm portions AP. Specifically, the first upper arm portion 2g which is an arm portion AP extending from the corner of the upper fixing portion 2a, and the first upper folded portion formed in an arc shape and connected at one end to the first upper arm portion 2g. Portion 2h, second upper arm portion 2k extending from the other end of first upper folded portion 2h so as to be parallel to first upper arm portion 2g, and second upper arm portion formed in an arc shape and having one end A second upper folded portion 2m connected to 2k and a third upper arm extending from the other end of the second upper folded portion 2m so as to be in parallel with the second upper arm portion 2k and coupled to the upper mounting portion 2f. Part 2n. The second upper arm 2k is longer than the first upper arm 2g, and the third upper arm 2n is longer than the second upper arm 2k. As described above, the upper leaf spring 2 has the cross-sectional area of the long arm portion AP larger than the cross-sectional area of the short arm portion AP. The second upper arm portion 2k is larger than the first upper arm portion 2g, and the third upper arm portion 2n is larger than the second upper arm portion 2k. In the first embodiment, the upper leaf spring 2 has the same thickness of the metal thin plate at any location, and the long arm portion AP and the short arm portion AP have the same thickness. The dimensions are the same. Accordingly, the width dimension of the arm part AP having a long length is configured to be thicker than the width dimension of the arm part AP having a short length, and the width dimension of the arm part AP in the upper leaf spring 2 is the first upper arm part 2g. The width dimension w2 of the second upper arm part 2k is larger than the width dimension w1, and the width dimension w3 of the third upper arm part 2n is larger than the width dimension w2 of the second upper arm part 2k.

  As shown in FIG. 5, the lower leaf spring 3 is formed in a substantially rectangular annular shape by arranging a first lower leaf spring 3a and a second lower leaf spring 3b, which are obtained by processing a metal thin plate, side by side. In addition, since the first lower leaf spring 3a and the second lower leaf spring 3b are formed in line symmetry, in the following description, the description of the second lower leaf spring 3b will be made with the description of the first lower leaf spring 3a. Is omitted. The first lower leaf spring 3a has a lower movable portion 3c formed in an arc shape (semicircular shape). The lower movable part 3c is a part corresponding to the aforementioned partial PA. The lower movable portion 3c has a lower mounting portion 3r formed in a flat plate shape in the vicinity of the midpoint position of the arc formed by the lower movable portion 3c. The lower movable portion 3c is a through-hole into which the lower holding projection 1f of the lens holding member 1 can be inserted into both ends of the lower movable portion 3c constituting a part PA and the lower mounting portion 3r. One formed first lower fixing hole 3d is provided. Further, the first lower leaf spring 3a has a lower fixing portion 3e arranged outside the arc formed by the lower movable portion 3c. The lower fixing portion 3e is a portion corresponding to the other portion PB described above. The lower fixed portion 3e has a linear portion 3f formed in a straight line shape, and protrudes toward the lower movable portion 3c at both ends of the linear portion 3f, and substantially extends along the outer shape of the lower movable portion 3c. A plate-like portion 3g formed in a triangular plate shape is formed. Each plate-like portion 3g constituting the other portion PB is formed with one second lower fixing hole 3s which is a through hole. Moreover, the welding part 3t which is a rectangular through-hole is formed in one (Y2 direction side) plate-like part 3g. The distance from one plate-like portion 3g of the lower fixed portion 3e to the other plate-like portion 3g is substantially the same as the distance from one end to the other end of the lower movable portion 3c. The lower leaf spring 3 includes a spring portion SP that connects the lower fixed portion 3e and the lower movable portion 3c (hereinafter, the spring portion SP of the lower leaf spring 3 is referred to as a lower spring portion 3h). Yes. The lower spring portion 3h extends from the plate-like portions 3g at both ends of the lower fixed portion 3e, and is connected to both ends of the lower movable portion 3c disposed on the same side as the respective plate-like portions 3g. . The lower spring portion 3h is formed of two folded portions RP and three arm portions AP. Specifically, the first lower arm portion 3k which is an arm portion AP extending from the plate-like portion 3g of the lower fixing portion 3e, and one end of the arc portion are connected to the first lower arm portion 3k. A first lower folded portion 3m, a second lower arm portion 3n extending from the other end of the first lower folded portion 3m so as to be in parallel with the first lower arm portion 3k, and an arc shape A second lower folded portion 3p that is formed and connected at one end to the second lower arm portion 3n, and extends from the other end of the second lower folded portion 3p so as to be in parallel with the second lower arm portion 3n. And a third lower arm portion 3q connected to the end of the lower movable portion 3c. The lower spring portion 3h formed in this manner has elasticity. When the lower fixed portion 3e is fixed, the lower leaf spring passes through the lower movable portion 3c formed in an arc shape through the center of the arc. The lower movable portion 3c and the lower fixed portion 3e are connected so as to be movable along an axis SF orthogonal to the plate surface 3. In this way, the first lower leaf spring 3a is formed. The second lower leaf spring 3b is formed in a line-symmetric shape with respect to the first lower leaf spring 3a, and its axis of symmetry AX is parallel to a straight line connecting both ends of the lower movable portion 3c. It is on the opposite side to the side on which the lower fixed portion 3e is disposed across the side movable portion 3c. By disposing the first lower leaf spring 3a and the second lower leaf spring 3b so that both ends of the lower movable portion 3c face each other, the lower leaf spring 3 is formed in an annular shape having a rectangular outer shape. .

  As shown in FIG. 2, the support member 70 is formed of a yoke 7, a base member 8, and a cover member 9.

  The cover member 9 is made of a synthetic resin material and is formed in a rectangular flat plate shape as shown in FIG. The cover member 9 has an opening 9a formed through the center, and the opening 9a is formed in a circular shape. The cover member 9 has holding pins 9b that protrude downward and are formed in a columnar shape at the four corners of the lower surface (the surface on the Z2 direction side). The holding pin 9b is formed in a size that can be inserted into the upper fixing hole 2d of the upper leaf spring 2, and the arrangement interval is set according to the arrangement interval of the upper fixing hole 2d. Moreover, the cover member 9 has the recessed part 9c by which the circumference | surroundings of the opening part 9a of the lower surface were formed in the concave shape.

  The yoke 7 is made of a magnetic metal plate, and as shown in FIG. 8, the inside is hollow and formed in a substantially rectangular parallelepiped shape, and the lower part is opened. The yoke 7 has an annular outer wall portion 7a, four inner wall portions 7b located inside the outer wall portion 7a, and a top plate portion 7c that connects the outer wall portion 7a and the inner wall portion 7b with a space therebetween. The outer wall portion 7a and the inner wall portion 7b are provided so as to protrude in the same direction (Z2 direction) perpendicular to the top plate portion 7c. The four outer wall portions 7a intersect with each other, and corner portions 7d are formed at the intersecting portions. The lower end (end on the Z2 direction side) of the corner 7d is provided with a tongue piece 7g that is formed in a flat plate shape so as to intersect the corner 7d and project outward in the direction of the corner 7d. Yes. The inner wall portion 7b is provided inside the outer wall portion 7a and at a position facing the corner portion 7d. The inner wall portion 7b is formed to be curved so as to be convex toward the corner portion 7d in a plan view from the Z1-Z2 direction, and is arranged in an arc shape. The inner wall portion 7b is formed by subjecting a part of the top plate portion 7c to sheet metal processing, and a through-hole portion is formed at the center of the top plate portion 7c so as to follow an arc shape formed by the inner wall portion 7b in plan view. 7e is formed. The through-hole portion 7e has a diameter that allows the cylindrical portion 1a of the lens holding member 1 to be inserted, and the arc-shaped diameter formed by the inner wall portion 7b is smaller than the size of the winding portion 6a of the coil 6. Further, insertion holes 7f into which the holding pins 9b of the cover member 9 can be inserted are formed at the four corners of the top plate portion 7c.

  The base member 8 is made of a synthetic resin material. As shown in FIG. 9, the outer shape of the base member 8 is rectangular when viewed from above (Z1 direction side), and an opening hole portion 8a which is a circular through hole is formed at the center. It has an annular shape. The base member 8 has mounting portions 8c formed in a planar shape at the four corners of the upper surface, and the mounting portion 8c has mounting protrusions 8b protruding upward. Further, the attachment protrusion 8b is formed in a size that can be inserted into the second lower fixing hole 3s of the lower leaf spring 3, and is disposed corresponding to the arrangement of the second lower fixing hole 3s. The base member 8 is embedded with the metal member 4 made of a metal plate material partially exposed. The mounting portion 8c provided on one side (Y2 direction side) of the base member 8 is provided with the first connection surface portion 4a and the second connection surface portion 4b which are part of the metal member 4 exposed. . The first connection surface portion 4a is exposed to the placement portion 8c on the X1 direction side, the second connection surface portion 4b is exposed to the placement portion 8c on the X2 direction side, and the first connection surface portion 4a, the second connection surface portion 4b, Is insulated. In addition, a first connection terminal portion 4 c and a second connection terminal portion 4 d which are part of the metal member 4 are provided at one end of the lower surface of the base member 8 so as to protrude downward. The first connection terminal portion 4c projects from the X1 direction side of the lower surface, and the second connection terminal portion 4d projects from the X2 direction side of the lower surface. The first connection surface portion 4a and the first connection terminal portion 4c are electrically connected, and the second connection surface portion 4b and the second connection terminal portion 4d are electrically connected. In addition, the holding portions 4e which are part of the metal member 4 are exposed at the four corners of the base member 8, and the holding portions 4e are formed by a single member formed in a rectangular shape so as to follow the outer shape of the base member 8. Has been. The holding portion 4e is insulated from the first connection surface portion 4a and the second connection surface portion 4b.

  The magnet 5 is formed so as to be disposed in a space sandwiched between the inner wall 7b, the corner 7d of the yoke 7, and the outer wall 7a continuous to the corner 7d, and when viewed in a plan view from the Z1 direction as shown in FIG. Are formed in a substantially trapezoidal columnar shape with the same hypotenuse length. The surface corresponding to the short side of the trapezoid is defined as the first surface 5a, the surface corresponding to the oblique side is defined as the second surface 5b, and the surface corresponding to the long side is defined as the third surface 5c. The first surface 5a is formed to match the inner surface shape of the corner portion 7d of the yoke 7, the second surface 5b is formed to match the inner surface shape of the outer wall portion 7a, and the third surface 5c is formed to the inner wall portion 7b. It is formed so as to be curved along.

  Next, the structure of the lens driving device 100 will be described with reference to FIGS. 4 and 10 to 16. FIG. 10 is an explanatory view showing an engagement method of the upper leaf spring 2, the cover member 9 and the yoke 7 in the first embodiment, and FIG. 10A is a positional relationship between the upper leaf spring 2, the cover member 9 and the yoke 7. FIG. 10B is a perspective view showing a state in which the upper leaf spring 2, the cover member 9 and the yoke 7 are integrally formed. FIG. 11 is an explanatory view showing a fixing method of the magnet 5 in the first embodiment, FIG. 11 (a) is an exploded perspective view showing a positional relationship between the magnet 5 and the yoke 7, and FIG. 11 (b) is a magnet. FIG. 5 is a plan view showing a state in which 5 is fixed inside the yoke 7. FIG. 12 is an explanatory diagram showing a method of fixing the lower leaf spring 3 to the lens holding member 1 in the first embodiment, and FIG. 12A is an exploded view showing the positional relationship between the lower leaf spring 3 and the lens holding member 1. FIG. 12B is a perspective view showing a state in which the lower leaf spring 3 is fixed to the lens holding member 1. 13 is an enlarged view showing the portion B shown in FIG. 12, and FIG. 13A is an enlarged side view showing the portion B as seen from the X2 direction side shown in FIG. 13 (b) is an enlarged plan view showing a portion B as viewed from the Z2 direction side shown in FIG. FIG. 14 is an explanatory view showing a method of fixing the lower leaf spring 3 to the base member 8 in the first embodiment, and FIG. 14A is an exploded perspective view showing the positional relationship between the lower leaf spring 3 and the base member 8. FIG. 14B is a perspective view showing a state in which the lower leaf spring 3 is fixed to the base member 8. FIG. 15 is an explanatory view showing a fixing method between the yoke 7 and the base member 8 and a fixing method between the lens holding member 1 and the upper leaf spring 2 in the first embodiment, and FIG. FIG. 15B is a perspective view showing a state in which the yoke 7 and the base member 8 are fixed and a state in which the lens holding member 1 and the upper leaf spring 2 are fixed. FIG. 16 is a schematic cross-sectional view schematically showing a cross section of the lens driving device 100 cut along a diagonal line when the lens driving device 100 shown in FIG. 1 is viewed from the Z1 direction side shown in FIG. .

  As shown in FIG. 10, the upper leaf spring 2 is sandwiched between the cover member 9 and the yoke 7. At this time, the cover member 9 and the yoke 7 are arranged so that the surface of the cover member 9 on which the holding pin 9b is provided and the top plate portion 7c of the yoke 7 face each other. Further, the holding pin 9b of the cover member 9 is inserted into the upper fixing hole 2d of the upper leaf spring 2 and the insertion hole 7f of the yoke 7, and the tip end portion of the holding pin 9b is caulked, so that the upper leaf spring 2 and the cover member are 9 and the yoke 7 are integrally formed. The upper leaf spring 2 is engaged only with the upper fixing portion 2a, and the upper movable portion 2b is movable (displaceable) in the optical axis direction DR1 (Z1-Z2 direction) by bending the upper spring portion 2c. ).

  As shown in FIG. 11, the magnet 5 is disposed inside the outer wall portion 7 a of the yoke 7 formed integrally with the upper leaf spring 2 and the cover member 9. The magnet 5 contacts the inner surface of the corner 7d with the first surface 5a, and the second surface 5b contacts the inner surface of the outer wall 7a continuous with the corner 7d. It inserts to the position which contacts and is hold | maintained inside the yoke 7 with the adhesive agent. Thereby, the upper leaf | plate spring 2, the cover member 9, the yoke 7, and the magnet 5 are integrally formed.

  As shown in FIG. 4 and as described above, the coil 6 is wound around the outer periphery of the lens holding member 1, and the end 6 b is wound and held on the winding projection 1 g of the lens holding member 1. With respect to the lens holding member 1 on which the coil 6 is wound in this way, the lower leaf springs 3 are respectively provided in the first lower fixing holes 3d in the lower holding protrusions of the lens holding member 1 as shown in FIG. When 1f is inserted and the tip of the lower holding projection 1f is caulked, the lower movable portion 3c is connected to and held by the lens holding member 1. As the lower leaf spring 3 is held by the lens holding member 1 in this way, the winding projection 1g around which the end portion 6b of the coil 6 is wound becomes the end portion of the lower attachment portion 3r of the lower leaf spring 3. Are arranged side by side with a small gap between them. The lower mounting portion 3r and the end portion 6b wound around the winding projection 1g are electrically connected by soldering using solder SO as shown in FIG. And fixed. Thus, the end 6b of the coil 6 and the lower mounting portion 3r are soldered, whereby the first lower leaf spring 3a and the second lower leaf spring 3b are electrically connected via the coil 6. The

  As shown in FIG. 14, the lens holding member 1, the coil 6, and the lower leaf spring 3 that are integrally formed are inserted into the second lower fixing hole 3 s of the lower leaf spring 3 so that the mounting protrusion 8 b is inserted into the base member. 8 is placed on the base member 8 so as to be movable in the optical axis direction DR1 (Z1-Z2 direction) by being caulked at the tip of the mounting protrusion 8b. At this time, the first connection surface portion 4a and the second connection surface portion 4b are arranged so as to contact the welded portion 3t, and the first connection surface portion 4a, the second connection surface portion 4b, and the welded portion 3t are arranged. Joined by welding WE, the first connection terminal portion 4 c and the second connection terminal portion 4 d are electrically connected via the lower leaf spring 3 and the coil 6. That is, it is possible to pass a current from the first connection terminal portion 4c and the second connection terminal portion 4d to the coil 6.

  As shown in FIG. 15, the integrally formed lens holding member 1, coil 6, lower leaf spring 3, base member 8, integrally formed upper leaf spring 2, cover member 9, yoke 7, magnet 5 (see FIG. 11) is arranged so that the tongue piece 7 g of the yoke 7 contacts the holding portion 4 e exposed from the base member 8. The contacted tongue piece 7g and the holding portion 4e are fixed by welding WE. Further, by arranging each component in this way, the upper mounting portion 2 f of the upper leaf spring 2 is engaged with the upper leaf spring arrangement portion 1 d of the lens holding member 1. The engaged upper mounting portion 2f and upper leaf spring arrangement portion 1d are fixed by an adhesive. By forming in this way, as shown in FIG. 16, a part PA (upper movable part 2b and lower movable part 3c) is fixed to the lens holding member 1 and the other part PB (upper fixed part 2a). The upper leaf spring 2 and the lower leaf spring 3 with the lower fixing portion 3e) fixed to the support member 70 support the lens holding member 1 so as to be movable in the optical axis direction DR1. Further, by being formed in this way, the inner wall portion 7b of the yoke 7 is disposed so as to be inserted into the gap between the cylindrical portion 1a of the lens holding member 1 and the coil 6, and the cylindrical portion 1a and It is separated from the coil 6. In addition, the magnet 5 is disposed at a position facing the coil 6 and spaced from the coil 6. Therefore, the outer wall 7a, the inner wall 7b, the magnet 5 and the coil 6 are arranged on the same straight line, and the moving mechanism 50 configured to include the magnet 5, the coil 6 and the yoke 7 is formed. In this way, the lens driving device 100 is formed.

  Next, the operation of the lens driving device 100 will be described with reference to FIG.

  In the lens driving device 100, as shown in FIG. 16, the lens holding member 1 is held by the upper leaf spring 2 and the lower leaf spring 3 so as to be movable along the optical axis direction DR1. The lens holding member 1 is located at a position where the elastic force of the lower leaf spring 3 and the elastic force of the upper leaf spring 2 are balanced in an initial state where no current is supplied to the coil 6. When a current is passed through the coil 6 via the first connection terminal portion 4c and the second connection terminal portion 4d, the coil 6 is arranged in the magnetic field of the magnet 5, and thus a Lorentz force acts on the coil 6. The coil 6 is wound along the outer periphery of the cylindrical portion 1 a of the lens holding member 1, and the magnetic field of the magnet 5 is formed so as to intersect the coil 6 and connect the inner wall portion 7 b and the magnet 5. The Lorentz force acts in any direction of the optical axis direction DR1, that is, the Z1 direction or the Z2 direction. Therefore, the moving mechanism 50 can move the lens holding member 1 formed integrally with the coil 6 along the optical axis direction DR1 against the elastic force of the elastic member 10. Further, the direction of movement of the lens holding member 1 can be changed by reversing the direction of the current. Therefore, the captured image can be focused by moving the lens holding member 1 to which the lens body LE (see FIG. 3) is attached along the optical axis direction DR1.

  Hereinafter, the effect by having set it as 1st Embodiment is demonstrated.

  The lens driving device 100 according to the first embodiment includes a lens holding member 1 that can hold the lens body LE, and a part of the lens driving member 100 that is fixed to the lens holding member 1 and that is movably supported in the optical axis direction DR1. The side leaf spring 2 and the lower leaf spring 3, the support member 70 to which the other portions of the upper leaf spring 2 and the lower leaf spring 3 are fixed, and at least the magnet 5 and the coil that move the lens holding member 1 along the optical axis direction DR1. And the upper leaf spring 2 and the lower leaf spring 3 are connected to at least one folded portion RP and the folded portion RP between a part and the other portion. In the lens driving device including the spring portion SP having the arm portion AP, at least one of the upper leaf spring 2 and the lower leaf spring 3 has different lengths of the plurality of arm portions AP and is long. Long arm AP It was larger than the cross-sectional area of the short arm part AP lengths the product, characterized in that.

  Thereby, even if the lengths of the arm portions AP are different, the cross-sectional area of the long arm portion AP is made larger than the cross-sectional area of the short arm portion AP. The spring constant can be brought close to the same value. For this reason, the spring constant of the spring portion SP is unlikely to change at the position of the lens holding member 1 in the optical axis direction DR1, and the linearity of the displacement of the position of the lens holding member 1 when the coil 6 is energized can be improved. it can.

  In the lens driving device 100 of the first embodiment, the long arm portion AP and the short arm portion AP have the same thickness dimension, and the long arm portion AP has a width dimension. It is characterized in that it is thicker than the width dimension of the short arm portion AP.

  This makes it possible to adjust the cross-sectional area by fixing the thickness dimension and changing the cross-sectional area by changing the width dimension, making it easier to adjust the cross-sectional area by changing the thickness dimension for each part. Adjustments can be made.

[Second Embodiment]
The lens driving device 200 in the second embodiment will be described below. The lens driving device 200 in the second embodiment has the same components as the lens driving device 100 except that the lower leaf spring 32 having a shape different from that of the lower leaf spring 3 in the lens driving device 100 in the first embodiment is used. And it is the same structure. Therefore, in the following description, only the change point by using the lower leaf spring 32 and the lower leaf spring 32 will be described, and description of common parts will be omitted. Further, components common to the lens driving device 100 will be described using the same names and the same reference numerals. Further, by using the lower leaf spring 32, it is necessary to partially change the fixing structure of the component on the side to which the lower leaf spring 32 is fixed. However, the description is omitted in the following description. Further, since the external appearance of the lens driving device 200 is the same as that of the lens driving device 100, it is not shown.

  First, the configuration of the lens driving device 200 according to the second embodiment will be described with reference to FIG. FIG. 17 is a view showing the lower leaf spring 32 in the second embodiment, FIG. 17 (a) is a plan view showing the appearance of the lower leaf spring 32, and FIG. 17 (b) is shown in FIG. 17 (a). It is an enlarged view which expands and shows the C section.

  As shown in FIG. 17, the lower leaf spring 32 is formed in a substantially rectangular annular shape by arranging a first lower leaf spring 32a and a second lower leaf spring 32b, which are obtained by processing a metal thin plate, side by side. In addition, since the first lower leaf spring 32a and the second lower leaf spring 32b are formed in line symmetry, in the following explanation, the explanation of the first lower leaf spring 32b will be given with the explanation of the first lower leaf spring 32a. Is omitted. The first lower leaf spring 32a has a lower movable portion 32c formed in a substantially arc shape. The lower movable portion 32c is a portion corresponding to the aforementioned partial PA. The lower movable portion 32c has a lower mounting portion 32r formed in a flat plate shape in the vicinity of the midpoint position of the arc formed by the lower movable portion 32c, and connection portions 32x formed in a flat plate shape at both ends. Is formed. The first lower leaf spring 32a has a lower fixing portion 32e disposed outside the arc formed by the lower movable portion 32c. The lower fixing portion 32e is a portion corresponding to the other portion PB described above. The lower fixing portion 32e is formed in a substantially rectangular shape, and is divided into two at a rectangular midpoint position, and is configured by a first fixing portion 32v and a second fixing portion 32w. The first fixing portion 32v and the second fixing portion 32w are provided with lower fixing holes 32d at both ends. The lower leaf spring 32 has a spring portion SP (hereinafter, the spring portion SP of the lower leaf spring 32 is referred to as a lower spring portion 32h) that connects the lower fixed portion 32e and the lower movable portion 32c. Yes. The lower spring portion 32h extends from the end portions of the first fixing portion 32v and the second fixing portion 32w on the side where the first fixing portion 32v and the second fixing portion 32w face each other. It is connected to the connection part 32x of the lower movable part 32c arranged on the same side. The lower spring portion 32h is formed by one folded portion RP and two arm portions AP. Specifically, the lower spring portion 32h extends from the first fixed portion 32v and the second fixed portion 32w in a direction away from the lower movable portion 32c so as to follow an arc formed by the lower movable portion 32c. A first lower arm portion 32k that is an arm portion AP, a first lower folded portion 32m that is formed in an arc shape and has one end connected to the first lower arm portion 32k, and a first lower arm portion 32k in parallel. And a second lower arm portion 32n extending from the other end of the first lower folded portion 32m and coupled to the connection portion 32x of the lower movable portion 32c. Note that the length of the first lower arm portion 32k is longer than the length of the second lower arm portion 32n. The first lower arm portion 32k and the second lower arm portion 32n are formed to have the same plate thickness, and the width dimension of the first lower arm portion 32k, which is the long arm portion AP, is It is formed thicker than the width dimension of the second lower arm portion 32n which is the short arm portion AP. That is, the cross-sectional area of the first lower arm portion 32k is formed larger than the cross-sectional area of the second lower arm portion 32n. The first lower arm portion 32k, which is a long arm portion AP, has a short arm portion AP from one end away from the second lower arm portion 32n, which is a short arm portion AP. To the other end side located on the (second lower arm portion 32n) side, the width dimension gradually becomes narrower and extends so as to meander. The lower spring portion 32h formed in this way has elasticity, and when the lower fixed portion 32e is fixed, the lower leaf spring passes through the center of the circular arc through the lower movable portion 32c formed in an arc shape. The lower movable portion 32c and the lower fixed portion 32e are connected so as to be movable along an axis SF orthogonal to the plate surface of 32. In this way, the first lower leaf spring 32a is formed. The second lower leaf spring 32b is formed in a line-symmetric shape with respect to the first lower leaf spring 32a, and the axis of symmetry AX is far from the first fixing portion 32v and the second fixing portion 32w. It is parallel to a straight line connecting the end portions on the side, and is on a line passing through the center of the arc formed by the lower movable portion 32c of the first lower leaf spring 32a. By arranging the first lower leaf spring 32a and the second lower leaf spring 32b so that both ends of the lower movable portion 32c face each other, the lower leaf spring 32 is formed in an annular shape having a substantially rectangular outer shape. The

  Next, the configuration of the lens driving device 200 in the second embodiment will be described. The lens driving device 200 uses the lower leaf spring 32 for the elastic member 10, so that both the upper leaf spring 2 and the lower leaf spring 32 have different lengths of the plurality of arm portions AP, and the length of the upper leaf spring 2 is different. The cross-sectional area of the long arm part AP is larger than the cross-sectional area of the short arm part AP.

  Hereinafter, the effect by having set it as 2nd Embodiment is demonstrated.

  In the lens driving device 200 of the second embodiment, the long arm part AP (first lower arm part 32k) is one end part away from the short arm part AP (second lower arm part 32n). The width dimension is gradually narrowed toward the other end side located on the short arm part AP (second lower arm part 32n) side.

  As a result, the long arm portion AP (first lower arm portion 32k) is directed from the one end portion toward the other end portion side located on the short arm portion AP (second lower arm portion 32n) side. Thus, the width is gradually reduced. With such a structure, the spring constant of the long arm portion AP (first lower arm portion 32k) and the spring constant of the short arm portion AP (second lower arm portion 32n) are obtained. While approaching the same value, the arm portion AP (second second) having a shorter width and length on the arm portion AP (first lower arm portion 32k) side in the folded portion RP (first lower folded portion 32m) side. The difference from the width dimension on the lower arm portion 32n) side can be reduced. Therefore, there is no place where the width dimension of the spring portion SP changes suddenly, and it is possible to make it difficult to cause breakage or buckling due to stress concentration.

  The lens driving device 200 according to the second embodiment is characterized in that the long arm portion AP (first lower arm portion 32k) extends so as to meander.

  Thereby, the arm part AP having a long length (the first lower arm part 32k) is extended so as to meander, thereby ensuring a longer length of the arm part AP in a limited region. So that the spring constant of the long arm portion AP (first lower arm portion 32k) and the spring constant of the short arm portion AP (second lower arm portion 32n) approach the same value. Can be easily adjusted.

  Further, in the lens driving device 200 of the second embodiment, both the upper leaf spring 2 and the lower leaf spring 32 are different in the lengths of the plurality of arm portions AP and have a long arm portion AP (the first length). The lower cross-sectional area of the first lower arm portion 32k) is larger than the cross-sectional area of the shorter arm portion AP (second lower arm portion 32n).

  As a result, the spring constants of the spring portions SP of both leaf springs (the upper leaf spring 2 and the lower leaf spring 32) are less likely to change depending on the position of the lens holding member 1 in the optical axis direction DR1, and the coil 6 is energized. The linearity of the displacement of the lens holding member 1 can be further improved.

  As described above, the lens driving device according to the embodiment of the present invention has been specifically described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. It is possible. For example, the present invention can be modified as follows, and these embodiments also belong to the technical scope of the present invention.

  In the first embodiment and the second embodiment, as the specific shape of the spring portion SP, the spring portion SP of the upper leaf spring 2, the lower leaf spring 3, and the lower leaf spring 32 is shown, but the shape as shown in FIG. It may be. 18 is a view showing a modification of the shape of the spring portion SP, FIG. 18 (a) is a plan view showing a modification of the shape of the elastic member 10, and FIG. 18 (b) is shown in FIG. 18 (a). It is an enlarged view which expands and shows the D section to show.

  In 1st Embodiment and 2nd Embodiment, in order to make the cross-sectional area of arm part AP with long length larger than the cross-sectional area of arm part AP with short length, plate | board thickness of arm part AP with long length Although the thickness of the short arm portion AP is set to the same dimension and the width dimension is changed, the following configuration may be used. The width dimension of the arm part AP having a long length and the width dimension of the arm part AP having a short length are made the same dimension, and the configuration in which the plate thickness dimension is changed, or either the width dimension or the plate thickness dimension is made the same dimension. Alternatively, the cross-sectional area of the long arm portion AP may be larger than the cross-sectional area of the short arm portion AP.

  In the first embodiment, only the upper leaf spring 2 has different lengths of the plurality of arm portions AP, and the cross-sectional area of the long arm portion AP (second upper arm portion 2k) is the same as the length. The structure is larger than the cross-sectional area of the short arm portion AP (first upper arm portion 2g). In the second embodiment, the upper leaf spring 2 and the lower leaf spring 32 have the same structure. However, only the lower leaf spring may have the same structure.

DESCRIPTION OF SYMBOLS 1 Lens holding member 1a Cylindrical part 1b Opening part 1c Coil holding | maintenance part 1d Upper leaf | plate spring arrangement | positioning part 1e ridge part 1f Lower holding protrusion 1g Winding protrusion 2 Upper leaf | plate spring 2a Upper fixed part 2b Upper movable part 2c Upper spring part 2d upper fixing hole 2e upper annular portion 2f upper mounting portion 2g first upper arm portion 2h first upper folded portion 2k second upper arm portion 2m second upper folded portion 2n third upper arm portion 3 lower leaf spring 3a first Lower leaf spring 3b Second lower leaf spring 3c Lower movable portion 3d First lower fixing hole 3e Lower fixing portion 3f Linear portion 3g Plate portion 3h Lower spring portion 3k First lower arm portion 3m First lower Side folded portion 3n Second lower arm portion 3p Second lower folded portion 3q Third lower arm portion 3r Lower mounting portion 3s Second lower fixing hole 3t Welded portion 4 Metal member 4a First connection surface portion 4b Second Connection surface part 4c 1st connection terminal part 4d 2nd connection terminal part 4e Holding part 5 Magnet 5a 1st surface 5b 2nd surface 5c 3rd surface 6 Coil 6a Winding part 6b End part 7 York 7a Outer wall part 7b Inner wall part 7c Top plate part 7d Corner | angular part 7e Through-hole Part 7f Insertion hole 7g Tongue piece part 8 Base member 8a Opening hole part 8b Mounting projection 8c Placement part 9 Cover member 9a Opening part 9b Holding pin 9c Recessed part 10 Elastic member 32 Lower leaf spring 32a First lower leaf spring 32b Second lower part Side leaf spring 32c Lower movable part 32d Lower fixed hole 32e Lower fixed part 32h Lower spring part 32k First lower arm part 32m First lower folded part 32n Second lower arm part 32r Lower attachment part 32v First 1 fixed portion 32w second fixed portion 32x connecting portion 50 moving mechanism 70 support member 100 lens driving device 200 lens driving device AP arm portion DR1 optical axis direction LE lens PA part PB other part RP folded portion SF shaft SP spring portion

Claims (5)

A lens holding member capable of holding the lens body;
An upper leaf spring and a lower leaf spring, part of which is fixed to the lens holding member and supports the lens holding member so as to be movable in the optical axis direction;
A support member to which other parts of the upper leaf spring and the lower leaf spring are fixed;
A moving mechanism configured to include at least a magnet and a coil for moving the lens holding member along the optical axis direction;
With
The upper leaf spring and the lower leaf spring are provided with a spring part having at least one folded part and a plurality of arm parts connected to the folded part between the part and the other part,
At least one of the upper leaf spring and the lower leaf spring has different lengths of the plurality of arm portions, and the cross-sectional area of the long arm portion is larger than the cross-sectional area of the short arm portion. A lens driving device characterized in that the size is also increased.   The long arm part and the short arm part have the same thickness dimension, and the width dimension of the long arm part is larger than the width dimension of the short arm part. The lens driving device according to claim 1, wherein:   The long arm portion is gradually narrowed in width from one end portion away from the short arm portion toward the other end portion located on the short arm portion side. The lens driving device according to claim 2.   The lens driving device according to any one of claims 1 to 3, wherein the long arm portion extends so as to meander. Both the upper leaf spring and the lower leaf spring have different lengths of the plurality of arm portions, and the cross-sectional area of the long arm portion is larger than the cross-sectional area of the short arm portion. The lens driving device according to claim 1, wherein the lens driving device is made larger.