JP2022024931A - Lens holder driving device - Google Patents

Abstract

To provide a lens holder driving device capable of performing further miniaturization.SOLUTION: A lens holder driving device includes: a fixed side member; a first driving mechanism DM1 for moving a first lens holder; and a second driving mechanism DM2 for moving a second lens holder. The fixed side member has a first coil assembly and a second coil assembly. A first coil 42A1 is provided on the first coil assembly and a second coil 42B2 is provided on the second coil assembly. A first driving magnet 6A facing the first coil 42A1 is fixed to the first lens holder and a second driving magnet 6B facing the second coil 42B2 is fixed to the second lens holder. The first driving magnet 6A and the first coil 42A1 constitute the first driving mechanism DM1, and the second driving magnet 6B and the second coil 42B2 constitute the second driving mechanism DM2.SELECTED DRAWING: Figure 12

Description

The present disclosure relates to a lens holder drive device.

Conventionally, an image pickup unit provided with a lens frame (lens holder) that is moved in a direction parallel to the optical axis by a lead screw that is rotationally driven by an electric motor is known (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-149336

However, since the above-mentioned imaging unit uses an electric motor to move the lens holder, it is difficult to further reduce the size.

Therefore, it is desired to provide a lens holder drive device capable of further miniaturization.

The lens holder drive device according to an embodiment of the present invention is arranged so as to have a fixed side member, a first lens holder capable of holding the first lens body, and the same optical axis as the first lens body. A movable side member including a second lens holder capable of holding the second lens body, a first drive mechanism for moving the first lens holder in the optical axis direction, and a second lens holder for moving the second lens holder in the optical axis direction. In a lens holder drive device including a two-drive mechanism, the fixed-side member has a first surface and a second surface provided so as to face each other with the first lens holder and the second lens holder interposed therebetween. A first coil is provided on the first surface of the lens.
A second coil is provided on the second surface, a first drive magnet facing the first coil is fixed to the first lens holder, and a second drive magnet facing the second coil is the first. Fixed to the two lens holders, the first drive magnet and the first coil form the first drive mechanism, and the second drive magnet and the second coil form the second drive mechanism. ing.

The above-mentioned lens holder drive device can be further miniaturized.

It is a perspective view of the lens holder drive device. It is a schematic diagram of a camera module. It is an exploded perspective view of the lens holder drive device. It is an exploded perspective view of the lower member. It is an exploded perspective view of the lower member. It is an exploded perspective view of the fixed side member constituting a lower member. It is an exploded perspective view of a coil assembly. It is an exploded perspective view of the movable side member. It is an exploded perspective view of a lens holder. It is a top view and a bottom view of a lens holder. It is sectional drawing of the lens holder drive device. It is a top view of the member which constitutes a drive mechanism. It is a top view of the member which constitutes a drive mechanism. It is a perspective view of the lower member. It is a perspective view and a front view of a holding mechanism. It is an exploded perspective view of the fixed side member. It is an exploded perspective view of a lens holding assembly. It is sectional drawing of the lens holding assembly. It is a block diagram which shows the structural example of the control system which controls a lens holder drive device.

Hereinafter, the lens holder drive device 101 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the lens holder drive device 101. FIG. 2 is a schematic diagram of a camera module CM in a camera-equipped mobile device equipped with a lens holder drive device 101.

As shown in FIG. 1, the lens holder drive device 101 is configured to be able to move the lens body LS along the optical axis JD of the lens body LS.

Note that X1 represents one direction of the X-axis constituting the three-dimensional Cartesian coordinate system, and X2 represents the other direction of the X-axis. Further, Y1 represents one direction of the Y axis constituting the three-dimensional Cartesian coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional Cartesian coordinate system, and Z2 represents the other direction of the Z axis. In this embodiment, the optical axis JD extends parallel to the X axis. The same applies to other figures.

The lens body LS is an example of an optical member, and is composed of one or a plurality of lenses. Typically, the lens body LS is a cylindrical lens barrel including at least one lens, and the central axis thereof is configured to be along the optical axis JD. In the present embodiment, the lens body LS includes a first lens body LS1 and a second lens body LS2.

The lens holder drive device 101 is configured so that the lens body LS can be moved along the optical axis direction by a drive mechanism DM (see FIG. 3) housed in the housing HS. The optical axis direction includes the direction of the optical axis JD of the lens body LS and the direction parallel to the optical axis JD. Specifically, the lens holder drive device 101 can move the first lens body LS1 along the optical axis direction as shown by the double-headed arrow AR1, and the second lens body as shown by the double-headed arrow AR2. The LS2 can be moved along the optical axis direction. That is, the lens holder drive device 101 can move each of the first lens body LS1 and the second lens body LS2 separately along the optical axis direction.

The housing HS is a part of the fixed side member FM, and is composed of the cover member 1 and the base plate 2.

As shown in FIG. 2, for example, the lens holder drive device 101 is used in a camera module CM such as a periscope type camera module. In the example shown in FIG. 2, the camera module CM mainly includes a mirror MR, a lens body LS, a lens holder drive device 101, an image sensor IS, and the like. The mirror MR as a reflector may be a prism. In this embodiment, the mirror MR is configured to provide a flat reflective surface.

As shown in FIG. 2, the lens holder drive device 101 is typically arranged at a position farther from the subject than the mirror MR, and the light LT from the subject reflected by the mirror MR is transmitted to the image sensor IS through the lens body LS. It is configured to reach.

Next, the outline of the lens holder driving device 101 will be described with reference to FIGS. 3 to 5. FIG. 3 is an exploded perspective view of the lens holder drive device 101, showing a state in which the cover member 1 is separated from the lower member LM. 4 and 5 are exploded perspective views of the lower member LM, showing a state in which the movable side member MB is separated from the fixed side member FM. Specifically, FIG. 4 is an exploded perspective view of the lower member LM viewed from the Y1 side, and FIG. 5 is an exploded perspective view of the lower member LM viewed from the Y2 side.

As shown in FIG. 3, the lens holder drive device 101 includes a cover member 1 and a lower member LM that are a part of the fixed side member FM.

The cover member 1 is configured to cover the lower member LM. In the present embodiment, the cover member 1 is manufactured by subjecting a plate material made of a non-magnetic material such as austenitic stainless steel to punching and drawing. Since it is made of a non-magnetic material, the cover member 1 does not have a magnetic adverse effect on the drive mechanism that utilizes the electromagnetic force.

As shown in FIG. 3, the cover member 1 has a bottomless box-shaped outer shape that defines the storage portion 1s. The cover member 1 has a substantially rectangular tubular outer wall portion 1A and a substantially rectangular annular and flat upper surface portion 1B provided so as to be continuous with the upper end (Z1 side end) of the outer wall portion 1A. An opening is formed in the center of the upper surface portion 1B. The outer wall portion 1A includes a first side plate portion 1A1 to a fourth side plate portion 1A4. The first side plate portion 1A1 and the third side plate portion 1A3 face each other, and the second side plate portion 1A2 and the fourth side plate portion 1A4 face each other. Further, the second side plate portion 1A2 and the fourth side plate portion 1A4 extend perpendicularly to the first side plate portion 1A1 and the third side plate portion 1A3. That is, the first side plate portion 1A1 and the third side plate portion 1A3 extend perpendicularly to the second side plate portion 1A2 and the fourth side plate portion 1A4. The first side plate portion 1A1 has an opening for receiving the light LT from the subject reflected by the mirror MR. Similarly, the third side plate portion 1A3 has an opening for allowing the optical LT to reach the image pickup device IS. Further, the cover member 1 is joined to the base plate 2 by an adhesive or the like to form a housing HS together with the base plate 2.

As shown in FIGS. 4 and 5, the lower member LM includes a lens holder 3 and a driving magnet 6 as a movable side member MB, a base plate 2 as a fixed side member FM, a coil assembly 4, a coil holder 5, and Includes a plate-shaped member 7.

The base plate 2 is a member that constitutes a part (bottom portion) of the housing HS. In the present embodiment, the base plate 2 is made of a non-magnetic material such as austenitic stainless steel, similarly to the cover member 1.

The lens holder 3 is configured to hold the lens body LS. In the present embodiment, the lens holder 3 is formed by injection molding a synthetic resin such as a liquid crystal polymer (LCP). Further, the lens holder 3 includes a first lens holder 3A configured to hold the first lens body LS1 and a second lens holder 3B configured to hold the second lens body LS2.

The drive magnet 6 is a member that constitutes the drive mechanism DM. In the present embodiment, the drive magnet 6 includes a first drive magnet 6A (see FIG. 4) attached to the first lens holder 3A and a second drive magnet 6B attached to the second lens holder 3B. (See FIG. 5).

In the present embodiment, each of the first drive magnet 6A and the second drive magnet 6B is a permanent magnet magnetized to two poles, and the inside (the side close to the optical axis JD) is magnetized to the north pole. , The outside is magnetized to the S pole. Further, as shown in FIG. 4, the first driving magnet 6A is attached to the first lens holder 3A so that the outside (S pole) is exposed. Similarly, as shown in FIG. 5, the second driving magnet 6B is attached to the second lens holder 3B so that the outside (S pole) is exposed. However, each of the first drive magnet 6A and the second drive magnet 6B may be magnetized on the S pole on the inside (the side close to the optical axis JD) and on the N pole on the outside.

Further, the first driving magnet 6A is arranged so as to face the coil attached to the first coil assembly 4A in the direction perpendicular to the optical axis JD and to be separated from the coil. Similarly, the second drive magnet 6B is arranged so as to face the coil attached to the second coil assembly 4B in the direction perpendicular to the optical axis JD and to be separated from the coil.

The coil holder 5 is configured to movably support the movable side member MB and movably support the coil assembly 4. In the present embodiment, the coil holder 5 is formed by injection molding a synthetic resin such as a liquid crystal polymer (LCP). The coil holder 5 together with the base plate 2 constitutes a base member BM. The base plate 2 and the coil holder 5 may be integrated. In this case, the base plate 2 may be made of the same synthetic resin as the coil holder 5.

The coil assembly 4 is configured to hold the coils that make up the drive mechanism DM. In the present embodiment, the coil assembly 4 is a first coil assembly 4A arranged to face the first drive magnet 6A and a second coil assembly arranged to face the second drive magnet 6B. Includes 4B. The substrate 41 (see FIG. 7) of the coil assembly 4 is formed of a flexible printed substrate and is attached to the coil holder 5 via the plate-shaped member 7 as shown in FIGS. 4 and 5. In the attached drawings, for the sake of clarity, the detailed winding state of the conductive wire whose surface is covered with the insulating material is omitted.

The plate-shaped member 7 is configured to support the coil assembly 4. In this embodiment, the plate-shaped member 7 is made of a magnetic material and functions as a yoke. The plate-shaped member 7 includes a first plate-shaped member 7A that supports the first coil assembly 4A and a second plate-shaped member 7B that supports the second coil assembly 4B.

Next, with reference to FIGS. 6 and 7, the details of the fixed-side member FM constituting the lower-side member LM will be described. FIG. 6 is an exploded perspective view of the fixed side member FM constituting the lower member LM. FIG. 7 is an exploded perspective view of the coil assembly 4.

As shown in FIG. 7, the coil assembly 4 includes a substrate 41, a coil set 42, a magnetic sensor set 43, and a lens holding assembly LH.

The substrate 41 is a member on which a conductive pattern for supplying electric power to the coil set 42, the magnetic sensor set 43, and the like is formed. In this embodiment, the substrate 41 is formed of a flexible printed circuit board. Further, the substrate 41 includes a connection portion CP in which a conductive pattern for supplying electric power to the electromagnetic mechanism EM (see FIG. 17) included in the lens holding assembly LH is formed. Specifically, the connecting portion CP is configured so that its upper surface (Z1 side surface) and the lower surface of the lens holding assembly LH (Z2 side surface) are in contact with each other. In this embodiment, the substrate 41 includes a first substrate 41A of the first coil assembly 4A and a second substrate 41B of the second coil assembly 4B.

The coil set 42 is a member constituting the drive mechanism DM, and is attached to the substrate 41. In the present embodiment, the coil set 42 is a winding type coil, and is attached to the first coil set 42A attached to the first substrate 41A of the first coil assembly 4A and the second substrate 41B of the second coil assembly 4B. The second coil set 42B to be used is included.

The first coil set 42A includes a first coil 42A1 and a second coil 42A2. The first coil 42A1 and the second coil 42A2 are configured so that the direction in which the current flows can be controlled separately. Similarly, the second coil set 42B includes a first coil 42B1 and a second coil 42B2. The first coil 42B1 and the second coil 42B2 are configured so that the direction in which the current flows can be controlled separately.

The magnetic sensor set 43 is an example of a magnetic detection member. In the present embodiment, the magnetic sensor set 43 is a set of Hall elements, and is configured to be able to detect the magnetism generated by the driving magnet 6 attached to the lens holder 3.

Specifically, the magnetic sensor set 43 includes a first magnetic sensor set 43A attached to the first substrate 41A of the first coil assembly 4A and a second magnetic sensor set attached to the second substrate 41B of the second coil assembly 4B. Including 43B.

The first magnetic sensor set 43A includes a first Hall element 43A1, a second Hall element 43A2, and a third Hall element 43A3. The first Hall element 43A1 is arranged inside the first coil 42A1, the second Hall element 43A2 is arranged between the first coil 42A1 and the second coil 42A2, and the third Hall element 43A3 is the third Hall element 43A3. It is arranged inside the two coils 42A2. Similarly, the second magnetic sensor set 43B includes a first Hall element 43B1, a second Hall element 43B2, and a third Hall element 43B3. The first Hall element 43B1 is arranged inside the first coil 42B1, the second Hall element 43B2 is arranged between the first coil 42B1 and the second coil 42B2, and the third Hall element 43B3 is the second coil. It is arranged inside the 42B2.

The lens holding assembly LH is a member for holding the lens holder 3 at the movement limit position as an example of the position on the end side of the movable range in the optical axis direction. The movement limit position means the position of the lens holder 3 when the lens holder 3 is moved to the end of the movable range of the lens holder 3. However, the lens holding assembly LH may hold the lens holder 3 in the vicinity of the movement limit position in the optical axis direction. In the present embodiment, as shown in FIG. 14, the lens holding assembly LH includes the first lens holding assembly LH1 for holding the first lens holder 3A at the movement limit position on the front side (X1 side), and the second lens. Includes a second lens holding assembly LH2 for holding the holder 3B in the rear (X2 side) movement limit position. Then, as shown in FIG. 7, the first lens holding assembly LH1 is attached to the connection portion CP of the second substrate 41B in the second coil assembly 4B, and the second lens holding assembly LH2 is the second coil assembly 4A in the first coil assembly 4A. 1 It is attached to the connection portion CP of the board 41A.

When the first lens holder 3A is held at the movement limit position on the X1 side, the first lens holder 3A is attached to a stopper portion (not shown) provided on the fixed side member FM such as the coil holder 5. It is in contact. The same applies when the second lens holder 3B is held at the movement limit position on the X2 side.

Next, the details of the movable side member MB will be described with reference to FIGS. 8 to 11. FIG. 8 is an exploded perspective view of the movable side member MB. FIG. 9 is an exploded perspective view of the lens holder 3. FIG. 10 is a top view and a bottom view of the lens holder 3. Specifically, FIG. 10A shows a top view of the lens holder 3, and FIG. 10B shows a bottom view of the lens holder 3. FIG. 11 is a cross-sectional view of the lens holder drive device 101. Specifically, FIG. 11A is a cross-sectional view of the lens holder drive device 101 in the YZ plane including the broken line CL1 in FIG. 11 (B) is an enlarged view of the range R1 surrounded by the broken line in FIG. 11 (A).

As shown in FIG. 8, the movable side member MB includes a lens holder 3 for holding the lens body LS and an engaging member 10. Specifically, the lens holder 3 includes a first lens holder 3A that holds the first lens body LS1 and a second lens holder 3B that holds the second lens body LS2. The engaging member 10 includes a first engaging member 10A attached to the first lens holder 3A and a second engaging member 10B attached to the second lens holder 3B.

The engaging member 10 is configured to be able to engage with the lens holding assembly LH when the lens holder 3 is in the movement limit position in the optical axis direction. In this embodiment, the engaging member 10 is made of a metal plate. Then, as shown in FIG. 14, the first engaging member 10A is configured to be able to engage with the first lens holding assembly LH1 when the first lens holder 3A is in the movement limit position on the X1 side. .. Similarly, the second engaging member 10B is configured to be able to engage with the second lens holding assembly LH2 when the second lens holder 3B is in the movement limit position on the X2 side.

As shown in FIG. 11A, the lens holder 3 is configured to be sandwiched between the cover member 1 and the coil holder 5. Specifically, the lens holder 3 contacts the upper surface of the coil holder 5 via the lower ball set 8 and contacts the ceiling surface (upper surface portion 1B) of the cover member 1 via the upper ball set 9. It is configured as follows.

As shown in FIG. 8, the lower ball set 8 includes a first lower ball set 8A that supports the first lens holder 3A and a second lower ball set 8B that supports the second lens holder 3B. The first lower ball set 8A includes four balls (first ball 8A1 to fourth ball 8A4). Similarly, the second lower ball set 8B includes four balls (first ball 8B1 to fourth ball 8B4).

In this embodiment, the eight balls constituting the lower ball set 8 are made of metal. However, the eight balls constituting the lower ball set 8 may be made of synthetic resin.

As shown in FIG. 8, the upper ball set 9 includes a first upper ball set 9A that supports the first lens holder 3A and a second upper ball set 9B that supports the second lens holder 3B. The first upper ball set 9A includes four balls (first ball 9A1 to fourth ball 9A4). Similarly, the second upper ball set 9B includes four balls (first ball 9B1 to fourth ball 9B4).

In this embodiment, the eight balls constituting the upper ball set 9 are made of metal. However, the eight balls constituting the upper ball set 9 may be made of synthetic resin.

As shown in FIG. 9, the lens holder 3 includes a lens carrier 30, a spring set 31, and a push bar set 32. In this embodiment, the lens carrier 30 and the push bar set 32 are made of synthetic resin, and the spring set 31 is made of metal.

The lens carrier 30 is a member for holding the lens body LS. In the present embodiment, the lens carrier 30 includes a first lens carrier 30A for holding the first lens body LS1 and a second lens carrier 30B for holding the second lens body LS2. The first lens body LS1 is fixed to the first lens carrier 30A by an adhesive, and the second lens body LS2 is fixed to the second lens carrier 30B by an adhesive.

The first lens carrier 30A has a recess RS6 on a side surface (side surface on the Y1 side) facing the first coil assembly 4A (see FIG. 4). A first driving magnet 6A is fitted in the recess RS6 and fixed with an adhesive.

Similarly, the second lens carrier 30B has a recess RS7 (invisible in FIG. 9) on the side surface (side surface on the Y2 side) facing the second coil assembly 4B (see FIG. 4). A second driving magnet 6B is fitted in the recess RS7 and fixed with an adhesive.

Further, as shown in FIG. 8, the first lens carrier 30A has a convex portion PR and a raised portion BL on the upper surface (upper surface on the Y2 side) of the side portion facing the second coil assembly 4B. Similarly, as shown in FIG. 8, the second lens carrier 30B has a convex portion PR and a raised portion BL on the upper surface (upper surface on the Y1 side) of the side portion facing the first coil assembly 4A. The convex portion PR and the raised portion BL have a structure for attaching the engaging member 10 to the lens carrier 30.

The convex portion PR is configured to penetrate the opening AP formed in the engaging member 10. In the present embodiment, the first lens carrier 30A is formed with two columnar convex portions PR. A concave portion for receiving the adhesive is formed around each of the two convex portions PR. The same applies to the second lens carrier 30B.

The raised portion BL is configured to mesh with the notch CU formed in the engaging member 10. In the present embodiment, one prismatic raised portion BL is formed on the first lens carrier 30A. The same applies to the second lens carrier 30B.

The first engaging member 10A has the convex portion PR received in each of the two opening APs, and the notched CU and the raised portion BL of the first lens carrier 30A are engaged with each other by the adhesive. 1 It is fixed to the lens carrier 30A. Similarly, the second engaging member 10B is adhered in a state where the convex portion PR is received in each of the two opening APs and in a state where the notch CU and the raised portion BL of the second lens carrier 30B are engaged with each other. It is fixed to the second lens carrier 30B by the agent.

As shown in FIG. 9, the spring set 31 is configured to urge the push bar set 32 upward (Z1 direction).

As shown in FIG. 8, the push bar set 32 is configured to hold the upper ball set 9 and press the upper ball set 9 against the ceiling surface of the cover member 1.

Specifically, the spring set 31 includes a first spring set 31A that urges the first push bar set 32A attached to the first lens carrier 30A upward, and a second push bar set 32B attached to the second lens carrier 30B. Includes a second spring set 31B that urges upwards.

The first spring set 31A includes four coil springs (first coil springs 31A1 to fourth coil springs 31A4). Similarly, the second spring set 31B includes four coil springs (first coil springs 31B1 to fourth coil springs 31B4).

The first push bar set 32A includes two push bars (first push bar 32A1 and second push bar 32A2). Similarly, the second push bar set 32B includes two push bars (first push bar 32B1 and second push bar 32B2).

In the present embodiment, the coil spring is fitted in the hole HL formed in the lens carrier 30 (see FIGS. 9 and 10 (A)) and is formed on the lower side (Z2 side) of the push bar set 32. It is configured to accept a columnar protrusion AX (see FIG. 9).

The hole HL formed in the first lens carrier 30A includes the first hole HL1 to the fourth hole HL4. The first hole HL1 accepts the first coil spring 31A1, the second hole HL2 accepts the second coil spring 31A2, the third hole HL3 accepts the third coil spring 31A3, and the fourth hole HL4 receives the fourth coil spring 31A4. accept.

Similarly, the hole HL formed in the second lens carrier 30B includes the first hole HL1 to the fourth hole HL4. The first hole HL1 accepts the first coil spring 31B1, the second hole HL2 accepts the second coil spring 31B2, the third hole HL3 accepts the third coil spring 31B3, and the fourth hole HL4 receives the fourth coil spring 31B4. accept.

As shown in FIG. 8, the first push bar 32A1 attached to the first lens carrier 30A has a first recess RS1 that rotatably receives the first ball 9A1 and a second recess RS2 that rotatably accepts the second ball 9A2. The second push bar 32A2 has a third recess RS3 that rotatably receives the third ball 9A3 and a fourth recess RS4 that rotatably accepts the fourth ball 9A4.

Similarly, the first push bar 32B1 attached to the second lens carrier 30B has a first recess RS1 that rotatably receives the first ball 9B1 and a second recess RS2 that rotatably accepts the second ball 9B2. The second push bar 32B2 has a third recess RS3 that rotatably receives the third ball 9B3 and a fourth recess RS4 that rotatably accepts the fourth ball 9B4.

As shown in FIG. 9, the protrusion AX formed on the first push bar 32A1 attached to the first lens carrier 30A has a first protrusion AX1 and a second protrusion AX2. The first protruding portion AX1 is fitted inside the first coil spring 31A1, and the second protruding portion AX2 is fitted inside the second coil spring 31A2. Further, the protruding portion AX formed on the second push bar 32A2 attached to the first lens carrier 30A has a third protruding portion AX3 and a fourth protruding portion AX4. The third protrusion AX3 is fitted inside the third coil spring 31A3, and the fourth protrusion AX4 is fitted inside the fourth coil spring 31A4.

Similarly, the protrusion AX formed on the first push bar 32B1 attached to the second lens carrier 30B has a first protrusion AX1 and a second protrusion AX2. The first protruding portion AX1 is fitted inside the first coil spring 31B1, and the second protruding portion AX2 is fitted inside the second coil spring 31B2. Further, the protruding portion AX formed on the second push bar 32B2 attached to the second lens carrier 30B has a third protruding portion AX3 and a fourth protruding portion AX4. The third protrusion AX3 is fitted inside the third coil spring 31B3, and the fourth protrusion AX4 is fitted inside the fourth coil spring 31B4.

As shown in FIG. 10B, on the lower surface (Z2 side surface) of the first lens carrier 30A, each of the first balls 8A1 to the fourth balls 8A4 constituting the first lower ball set 8A is received. The 1 recess RS1 to the 4th recess RS4 are formed. Similarly, on the lower surface (the surface on the Z2 side) of the second lens carrier 30B, the first recess RS1 to the fourth recess RS1 to the fourth recess that receive each of the first balls 8B1 to the fourth balls 8B4 constituting the second lower ball set 8B. RS4 is formed.

The lens holder 3 is slidable in the optical axis direction by the coil holder 5 via the lower ball set 8 arranged in the groove 5G (see FIGS. 4 and 5) formed on the upper surface of the coil holder 5. It is supported.

The groove 5G has a first groove 5G1 (see FIG. 4) arranged on the side closer to the second coil assembly 4B (Y2 side) and a second groove 5G arranged on the side closer to the first coil assembly 4A (Y1 side). Includes groove 5G2.

The first groove 5G1 receives the first ball 8A1 and the second ball 8A2 constituting the first lower ball set 8A, and the first ball 8B1 and the second ball 8B2 constituting the second lower ball set 8B. It is configured in.

The second groove 5G2 receives the third ball 8A3 and the fourth ball 8A4 constituting the first lower ball set 8A, and the third ball 8B3 and the fourth ball 8B4 constituting the second lower ball set 8B. It is configured in.

With the above-described configuration, the lens holder 3 is configured to be sandwiched between the cover member 1 and the coil holder 5 and to be movable along the optical axis direction. Specifically, as shown in FIG. 11, the first lens holder 3A is a first ball 8A1 (invisible in FIG. 11) constituting the first lower ball set 8A received in the first groove 5G1 of the coil holder 5. ) And the second ball 8A2, and the third ball 8A3 (not visible in FIG. 11) and the fourth ball 8A4 constituting the first lower ball set 8A received in the second groove 5G2 of the coil holder 5 in the optical axis direction. It is slidably supported.

Further, the first lens holder 3A urges the first push bar 32A1 upward by the first coil spring 31A1 (not visible in FIG. 11) and the second coil spring 31A2 constituting the first spring set 31A, and the first spring set 31A. The second push bar 32A2 is configured to be urged upward by the third coil spring 31A3 (not visible in FIG. 11) and the fourth coil spring 31A4. Then, the first lens holder 3A attaches the first ball 9A1 (invisible in FIG. 11) and the second ball 9A2 constituting the first upper ball set 9A supported by the first push bar 32A1 to the ceiling surface of the cover member 1. It is configured to press the third ball 9A3 (not visible in FIG. 11) and the fourth ball 9A4 constituting the first upper ball set 9A supported by the second push bar 32A2 against the ceiling surface of the cover member 1. ing. In the present embodiment, the ceiling surface of the cover member 1 is not formed with a structure such as a groove 5G that guides the movement of the upper ball set 9. However, a structure such as a groove 5G may be formed on the ceiling surface of the cover member 1.

With this configuration, the first lens holder 3A is sandwiched between the cover member 1 and the coil holder 5 so as not to cause rattling and to move smoothly in the optical axis direction.

As shown in FIG. 11B, in the first groove 5G1, the inclination of the outer slope SL2 with respect to the horizontal plane (the side far from the optical axis JD) with respect to the horizontal plane of the central side (the side closer to the optical axis JD) is relative to the horizontal plane of the slope SL1. It is configured to be larger than the slope. The shape of the first groove G1 and the shape of the second groove G2 are plane symmetric with respect to the XZ plane including the optical axis JD.

This configuration can realize the centering of the first lens holder 3A. That is, according to this configuration, the balls constituting the lower ball set 8 arranged in the groove 5G formed on the upper surface of the coil holder 5 are not only in the optical axis direction (direction parallel to the X axis) but also in the optical axis. It can also move slightly in the direction perpendicular to (the direction parallel to the Y axis). Therefore, when the first lens holder 3A is sandwiched between the cover member 1 and the coil holder 5, the XZ plane including the midpoint between the second ball 8A2 and the fourth ball 8A4 is the first groove 5G1. It is automatically adjusted to coincide with the XZ plane including the midpoint between the second groove 5G2, and the centering of the first lens holder 3A is appropriately realized. The same applies to the second lens holder 3B.

Next, the drive mechanism DM will be described with reference to FIGS. 12 and 13. 12 and 13 are top views of the members constituting the drive mechanism DM. The drive mechanism DM is composed of a drive magnet 6 and a coil set 42. In FIGS. 12 and 13, for the sake of clarity, illustration of members other than the members constituting the drive mechanism DM is omitted except for the lens body LS, the holding magnet 12, the substrate 41 of the coil assembly 4, and the magnetic sensor set 43. Has been done. Further, the coil set 42 is made transparent so that the position of the magnetic sensor set 43 can be known. Further, diagonal hatching is attached to each N pole of the driving magnet 6 and the holding magnet 12.

Specifically, in FIG. 12A, both the first lens holder 3A (first lens body LS1) and the second lens holder 3B (second lens body LS2) are separated from the movement limit position, and both are It shows the state when they are separated from each other. Further, FIG. 12B shows a state when both the first lens holder 3A (first lens body LS1) and the second lens holder 3B (second lens body LS2) are in the movement limit position. Further, in FIG. 13A, the first lens holder 3A (first lens body LS1) is separated from the movement limit position, the second lens holder 3B (second lens body LS2) is at the movement limit position, and both are present. Shows the state when they are in contact with each other. Further, in FIG. 13B, the first lens holder 3A (first lens body LS1) is in the movement limit position, the second lens holder 3B (second lens body LS2) is separated from the movement limit position, and both are Shows the state when they are in contact with each other.

The drive mechanism DM is configured to be able to move the lens holder 3 in the optical axis direction. In the present embodiment, the drive mechanism DM generates a driving force by the current flowing through the coil set 42 and the magnetic field generated by the driving magnet 6, so that the lens holder 3 can be moved along the optical axis JD. It is configured.

Specifically, the drive mechanism DM includes a first drive mechanism DM1 that moves the first lens holder 3A in the optical axis direction, and a second drive mechanism DM2 that moves the second lens holder 3B in the optical axis direction.

The first drive mechanism DM1 includes a first coil set 42A attached to the first substrate 41A of the first coil assembly 4A and a first drive magnet 6A attached to the first lens carrier 30A.

The second drive mechanism DM2 includes a second coil set 42B attached to the second substrate 41B of the second coil assembly 4B, and a second drive magnet 6B attached to the second lens carrier 30B.

The holding magnet 12 is configured to hold the lens holder 3 at the movement limit position by a magnetic force. In the present embodiment, the holding magnet 12 magnetically holds the first holding magnet 12A that magnetically holds the first lens holder 3A at the movement limit position and the second lens holder 3B at the movement limit position. Includes a second holding magnet 12B.

In the present embodiment, each of the first holding magnet 12A and the second holding magnet 12B is a permanent magnet magnetized to two poles, and the inside (the side close to the optical axis JD) is magnetized to the N pole. , The outside is magnetized to the S pole. Further, as shown in FIG. 6, the holding magnet 12 does not directly face the lens holder 3 (driving magnet 6), that is, the holding magnet 12 is indirectly connected to the driving magnet 6 by sandwiching a part of the coil holder 5. It is attached to the coil holder 5 so as to face each other. However, the inner side (the side closer to the optical axis JD) of each of the first holding magnet 12A and the second holding magnet 12B is magnetized to the S pole and the outer side is the N pole according to the magnetic poles of the driving magnet 6. It may be magnetized.

The first holding magnet 12A includes a front magnet 12A1 that holds the first lens holder 3A at the movement limit position on the X1 side, and a rear magnet 12A2 that holds the first lens holder 3A at the movement limit position on the X2 side. including.

Similarly, the second holding magnet 12B has a front magnet 12B1 that holds the second lens holder 3B at the movement limit position on the X1 side and a rear side that holds the second lens holder 3B at the movement limit position on the X2 side. Includes magnet 12B2.

Then, as shown in FIG. 6, the first holding magnet 12A is fitted into the recess RS5 of the coil holder 5 and fixed with an adhesive. The same applies to the second holding magnet 12B.

Specifically, as shown in FIG. 12B, the front side magnet 12A1 of the first holding magnet 12A is a first driving magnet 6A attached to the first lens holder 3A at the movement limit position on the X1 side. The first driving magnet 6A is arranged so as to be attracted by the attractive force acting between the magnet and the magnet.

Further, as shown in FIG. 13A, the rear side magnet 12A2 of the first holding magnet 12A is with the first driving magnet 6A attached to the first lens holder 3A at the movement limit position on the X2 side. It is arranged so as to attract the first driving magnet 6A by the attractive force acting between them.

Similarly, as shown in FIG. 13B, the front side magnet 12B1 of the second holding magnet 12B has a second driving magnet 6B attached to the second lens holder 3B at the movement limit position on the X1 side. It is arranged so as to attract the second driving magnet 6B by the attractive force acting between them.

Further, as shown in FIG. 12B, the rear side magnet 12B2 of the second holding magnet 12B has a second driving magnet 6B attached to the second lens holder 3B at the movement limit position on the X2 side. It is arranged so as to attract the second driving magnet 6B by the attractive force acting between them.

Next, the relationship between the magnetic pole of the first drive magnet 6A and the magnetic pole of the first coil set 42A when moving the first lens holder 3A at the movement limit position on the X1 side to the movement limit position on the X2 side will be described. do.

When the first lens holder 3A is in the movement limit position on the X1 side, the first drive magnet 6A is in a position facing the first coil 42A1 of the first coil set 42A as shown in FIG. 13B. .. However, the central axis M1 at the center position in the optical axis direction of the first drive magnet 6A does not match the central axis L1 at the center position in the optical axis direction of the first coil 42A1. This is because if the central axis M1 and the central axis L1 are aligned with each other, the first driving magnet 6A may not be separated by the repulsive force (repulsive force) when the first coil 42A1 is excited. The central axis M1 is a straight line parallel to the Y axis passing through the center point of the first drive magnet 6A, and the central axis L1 is a straight line parallel to the Y axis passing through the center point of the first coil 42A1. The same applies to the central axes L2, L3, L4, and M2 described later.

When the first coil 42A1 is not excited, the S pole of the first drive magnet 6A is attracted to the N pole of the front magnet 12A1 of the first holding magnet 12A, and the first drive magnet 6A (first lens holder). 3A) is held at the movement limit position on the X1 side.

First, the side of the first coil 42A1 facing the first drive magnet 6A (Y2 side) is the S pole, that is, the first drive magnet 6A and the first coil 42A1 repel each other. When the coil 42A1 is excited, the first driving magnet 6A moves to the X2 side along the optical axis direction as shown in FIG. 12 (A).

Then, the side (Y2 side) of the second coil 42A2 of the first coil set 42A facing the first drive magnet 6A has an N pole, that is, the first drive magnet 6A and the second coil 42A2 are arranged. When the second coil 42A2 is excited so as to attract each other, the first driving magnet 6A further moves toward X2 along the optical axis direction as shown in FIG. 13A.

When the first lens holder 3A is in the movement limit position on the X2 side, the first driving magnet 6A is in a position facing the second coil 42A2 as shown in FIG. 13A. However, the central axis M1 of the first driving magnet 6A does not match the central axis L2 at the center position in the optical axis direction of the second coil 42A2 for the above-mentioned reason.

When the first lens holder 3A is in the movement limit position on the X2 side and the second coil 42A2 is not excited, the S pole of the first driving magnet 6A is the rear magnet 12A2 of the first holding magnet 12A. The first driving magnet 6A (first lens holder 3A) is attracted to the north pole of the lens and is held at the movement limit position on the X2 side.

Similarly, when the second lens holder 3B is in the movement limit position on the X1 side, the second drive magnet 6B faces the first coil 42B1 of the second coil set 42B as shown in FIG. 13B. In position. However, the central axis M2 at the center position in the optical axis direction of the second drive magnet 6B does not match the central axis L3 at the center position in the optical axis direction of the first coil 42B1 for the above reason.

When the first coil 42B1 is not excited, the S pole of the second drive magnet 6B is attracted to the N pole of the front magnet 12B1 of the second holding magnet 12B, and the second drive magnet 6B (second lens holder). 3B) is held at the movement limit position on the X1 side.

First, the side of the first coil 42B1 facing the second drive magnet 6B (Y1 side) is the S pole, that is, the second drive magnet 6B and the first coil 42B1 repel each other. When the coil 42B1 is excited, the second driving magnet 6B moves to the X2 side along the optical axis direction as shown in FIG. 12 (A).

Then, the side (Y1 side) of the second coil 42B2 of the second coil set 42B facing the second drive magnet 6B has an N pole, that is, the second drive magnet 6B and the second coil 42B2 are arranged. When the second coil 42B2 is excited so as to attract each other, the second driving magnet 6B further moves to the X2 side along the optical axis direction as shown in FIG. 13A.

When the second lens holder 3B is in the movement limit position on the X2 side, the second driving magnet 6B is in a position facing the second coil 42B2 as shown in FIG. 13A. However, the central axis M2 of the second drive magnet 6B does not match the central axis L4 at the center position in the optical axis direction of the second coil 42B2 for the above-mentioned reason.

When the second lens holder 3B is in the movement limit position on the X2 side and the second coil 42B2 is not excited, the S pole of the second driving magnet 6B is the rear magnet 12B2 of the second holding magnet 12B. The second drive magnet 6B (second lens holder 3B) is attracted to the N pole of the lens and is held at the movement limit position on the X2 side.

Next, the sizes of the lens body LS, the driving magnet 6, and the coil set 42 will be described. In the present embodiment, as shown in FIG. 13B, the width W1 which is the dimension of the first lens body LS1 in the optical axis direction is larger than the width W2 which is the dimension of the second lens body LS2 in the optical axis direction. Therefore, as shown in FIGS. 4 and 5, the width W3 of the first lens holder 3A holding the first lens body LS1 is larger than the width W4 of the second lens holder 3B holding the second lens body LS2.

Further, as shown in FIG. 13A, the width W5 of the first drive magnet 6A is larger than the width W6 of the second drive magnet 6B. In this embodiment, the height of the first drive magnet 6A is the same as the height of the second drive magnet 6B.

Further, the width W7 of each of the first coil 42A1 and the second coil 42A2 constituting the first coil set 42A is the width W8 of the first coil 42B1 and the second coil 42B2 constituting the second coil set 42B. Greater than. In this embodiment, as shown in FIG. 7, the heights H1 of the first coil 42A1 and the second coil 42A2 constituting the first coil set 42A constitute the second coil set 42B. It is the same as the height H2 of the first coil 42B1 and the second coil 42B2.

Further, as shown in FIG. 13B, the width W9 of the arrangement region of the first coil set 42A partially overlaps the width W10 of the arrangement region of the second coil set 42B in the optical axis direction. The overlapping portion has a width W11.

The arrangement area of the first coil set 42A means an area in which the coil can be arranged in the first substrate 41A of the first coil assembly 4A. In the present embodiment, the first coil 42A1 is arranged at the right end (end on the X1 side) of the arrangement area, and the second coil 42A2 is arranged at the left end (end on the X2 side) of the arrangement area. Therefore, the width between the right end of the first coil 42A1 and the left end of the second coil 42A2 is the width W9 of the arrangement region. The same applies to the arrangement area of the second coil set 42B.

Further, as shown in FIG. 13A, the width W12, which is the distance between the first coil 42A1 and the second coil 42A2 constituting the first coil set 42A, constitutes the second coil set 42B. It is larger than the width W13, which is the distance between the first coil 42B1 and the second coil 42B2. This is because the width W5 of the first drive magnet 6A is larger than the width W6 of the second drive magnet 6B.

Next, with reference to FIGS. 14 to 18, a holding mechanism HM that mechanically holds the lens holder 3 at the movement limit position will be described. FIG. 14 is a perspective view of the lower member LM, showing a state in which the lens holder 3 is mechanically held at the movement limit position by the holding mechanism HM. FIG. 15 is a perspective view and a front view (side view seen from the X1 side) of the holding mechanism HM. FIG. 16 is an exploded perspective view of the fixed side member FM (excluding the cover member 1). FIG. 17 is an exploded perspective view of the lens holding assembly LH. FIG. 18 is a cross-sectional view of the lens holding assembly LH. Specifically, FIG. 18 is a cross-sectional view of the first lens holding assembly LH1 in the YZ plane including the dashed line CL2 in FIG. In FIG. 18, since the upper holding magnet 22, the plunger 25, and the lower holding magnet 26 are hatched at the N pole, the hatching indicating that they are cross sections is omitted.

The holding mechanism HM includes a lens holding assembly LH and an engaging member 10. In the present embodiment, as shown in FIG. 14, the holding mechanism HM includes the first holding mechanism HM1 that mechanically holds the first lens holder 3A at the movement limit position on the front side (X1 side), and the rear side (X1 side). Includes a second holding mechanism HM2 that mechanically holds the second lens holder 3B at the movement limit position (X2 side).

The first holding mechanism HM1 includes a first lens holding assembly LH1 and a first engaging member 10A. The second holding mechanism HM2 includes a second lens holding assembly LH2 and a second engaging member 10B.

As shown in FIG. 15, the first lens holding assembly LH1 is configured so that the locking portion 25e can be moved back and forth (moved up and down) in a direction parallel to the Z axis. FIG. 15 shows the relationship between the first lens holding assembly LH1 fixed to the second substrate 41B of the second coil assembly 4B and the first engaging member 10A fixed to the first lens carrier 30A of the first lens holder 3A. Is shown. Specifically, FIGS. 15 (A1) and 15 (A2) show the state when the locking portion 25e is pushed upward, and FIGS. 15 (B1) and 15 (B2) show the locking portion. The state when 25e is pulled down is shown.

In the present embodiment, the first lens holding assembly LH1 is configured so that the locking portion 25e can be moved up and down by the electromagnetic mechanism EM (see FIG. 17) inside the first lens holding assembly LH1. The same applies to the second lens holding assembly LH2.

Further, the electromagnetic mechanism EM in the first lens holding assembly LH1 is a side (Y2 side) of the first lens holder 3A on the side (Y1 side) on which the first driving magnet 6A is provided, which is opposite to the side portion SB1. ) Is arranged so as to face the side portion SB2. That is, the electromagnetic mechanism EM in the first lens holding assembly LH1 is arranged away from the first driving magnet 6A. This is to prevent interference between the magnetism generated by the first driving magnet 6A and the magnetism generated by the electromagnetic mechanism EM. The same applies to the positional relationship between the electromagnetic mechanism EM in the second lens holding assembly LH2 and the second driving magnet 6B.

As shown in FIG. 15A, the locking portion 25e is configured such that when extruded upward, its end surface is located above the upper surface of the engaging member 10. That is, the locking portion 25e is configured to mesh with the notch CT (see FIG. 8) formed in the engaging member 10 when pushed upward. Hereinafter, such a state is referred to as an “engaged state”. Further, as shown in FIG. 15 (B2), the locking portion 25e is configured such that when it is pulled downward, its end surface is located below the lower surface of the engaging member 10. That is, the locking portion 25e is configured so as not to engage with the notch CT (see FIG. 8) formed in the engaging member 10 when pulled downward. Hereinafter, such a state is referred to as a “non-engaged state”. The notch CT is an example of an engaging portion, and may be formed as a penetrating portion (opening (through hole)) that matches the shape of the locking portion 25e. Further, each of the engaging portion and the locking portion 25e has any structure as long as it can be engaged with each other, that is, if the engaged state and the non-engaged state can be selectively realized. You may be doing it.

Further, as shown in FIG. 16, the first lens holding assembly LH1 is fitted and fixed to the recess RS8 formed in the coil holder 5 in a state of being attached to the second substrate 41B of the second coil assembly 4B. The lens. Similarly, the second lens holding assembly LH2 is fitted and fixed to the recess RS9 formed in the coil holder 5 in a state of being attached to the first substrate 41A of the first coil assembly 4A.

Specifically, as shown in FIG. 17, the first lens holding assembly LH1 includes an upper cover 20, a yoke 21, an upper holding magnet 22, a bobbin 23, a coil 24, a plunger 25, a lower holding magnet 26, and a coil spring. It is composed of 27 and a lower cover 28 and the like.

Further, the upper holding magnet 22, the bobbin 23, the plunger 25, the lower holding magnet 26, and the coil spring 27 constitute a lock mechanism LK, and the yoke 21, the upper holding magnet 22, the bobbin 23, the coil 24, and the plunger 25 are formed. , And the lower holding magnet 26 constitute an electromagnetic mechanism EM. The same applies to the second lens holding assembly LH2.

The upper cover 20 is a substantially rectangular plate-shaped member forming the upper surface of the first lens holding assembly LH1. In this embodiment, the upper cover 20 is made of a magnetic material and is configured to function as a yoke. Further, the upper cover 20 has an opening 20k in the center through which the locking portion 25e formed at the upper end of the plunger 25 penetrates. Further, the upper cover 20 has six openings 20h through which the six protrusions 23p formed on the upper end of the bobbin 23 penetrate. In FIG. 17, only one of the six convex portions 23p is indicated by a reference numeral, and only one of the six openings 20h is indicated by a reference numeral. Further, one of the six openings 20h is formed as a notch that opens outward.

The yoke 21 is a member for efficiently acting a magnetic field generated by each of the upper holding magnet 22, the coil 24, and the lower holding magnet 26. In the present embodiment, the yoke 21 is made of a magnetic material and cooperates with the upper cover 20 and the lower cover 28 to form an upper holding magnet 22, a bobbin 23, a coil 24, a plunger 25, and a lower holding magnet 26. And is configured to surround the coil spring 27.

The upper holding magnet 22 is a member for magnetically maintaining an engaged state between the locking portion 25e of the plunger 25 and the engaging member 10. Specifically, the upper holding magnet 22 is arranged so that the plunger 25 made of the magnetic material can be attracted upward (Z1 direction). In the present embodiment, the upper holding magnet 22 includes a first magnet 22A and a second magnet 22B. Both the first magnet 22A and the second magnet 22B are permanent magnets magnetized to two poles, and as shown in FIG. 18, the lower side (Z2 side) is magnetized to the N pole and the upper side (Z1 side). ) Is magnetized to the S pole. Further, the first magnet 22A is fitted into the recess RS10 formed in the bobbin 23 and fixed with an adhesive. Similarly, the second magnet 22B is fitted into the recess RS11 formed in the bobbin 23 and fixed with an adhesive.

Note that FIG. 18A shows a state when the locking portion 25e is pulled downward, and FIG. 18B shows a state when the locking portion 25e is pushed upward. Further, FIG. 18 shows the distance between the end face of the locking portion 25e when the locking portion 25e is pushed upward and the end face of the locking portion 25e when the locking portion 25e is pulled downward. Indicates that a certain stroke amount is the value SK.

As shown in FIG. 18, each of the first magnet 22A and the second magnet 22B is attached to the bobbin 23 so that the S pole faces upward (Z1 direction). However, each of the first magnet 22A and the second magnet 22B may be attached to the bobbin 23 so that the north pole faces upward (Z1 direction).

The bobbin 23 is configured to support the upper cover 20, the yoke 21, the upper holding magnet 22, the coil 24, the plunger 25, the lower holding magnet 26, the coil spring 27, and the lower cover 28. In the present embodiment, the bobbin 23 is formed by injection molding a synthetic resin such as a liquid crystal polymer (LCP).

Specifically, as shown in FIG. 17, the bobbin 23 is configured such that the coil 24 is arranged around the constricted portion 23n.

Further, as shown in FIG. 18, the bobbin 23 is configured to receive the plunger 25, the lower holding magnet 26, and the coil spring 27 in the cavity CV formed inside. The plunger 25 is arranged in the cavity CV so that it can slide in the cavity CV in the vertical direction (Z-axis direction). The coil spring 27 is arranged in a compressed state between the plunger 25 and the lower cover 28 so that the plunger 25 can be urged upward (Z1 direction).

The coil 24 is configured to excite a plunger 25 made of a magnetic material. In this embodiment, the coil 24 is wound around the constricted portion 23n of the plunger 25. Specifically, when a current flows in the first direction of the wire rod constituting the coil 24, the coil 24 has an N pole on the upper side (Z1 side) of the plunger 25 as shown in FIG. 18 (A). And the lower part (Z2 side) of the plunger 25 is excited to the S pole. On the contrary, when a current flows in the second direction (opposite direction of the first direction) of the wire rod constituting the coil 24, the coil 24 is on the upper side (Z1 side) of the plunger 25 as shown in FIG. 18 (B). ) Is excited to the S pole, and the lower part (Z2 side) of the plunger 25 is excited to the N pole.

The plunger 25 is configured so that it can slide in the cavity CV of the bobbin 23 in the vertical direction (Z-axis direction) and can partially engage with the engaging member 10. In the present embodiment, the plunger 25 is arranged in the cavity CV in a state of being urged upward (Z1 direction) by the coil spring 27. Further, the plunger 25 is made of a magnetic material so as to be excited by the coil 24. Specifically, the plunger 25 has a main body portion 25m of a substantially rectangular parallelepiped and a prismatic locking portion 25e projecting upward from the main body portion 25m.

The lower holding magnet 26 is a member for magnetically maintaining a non-engaged state between the locking portion 25e of the plunger 25 and the engaging member 10. Specifically, the lower holding magnet 26 is arranged so that the plunger 25 made of the magnetic material can be attracted downward (Z2 direction). In the present embodiment, the lower holding magnet 26 includes a first magnet 26A and a second magnet 26B. Both the first magnet 26A and the second magnet 26B are permanent magnets magnetized to two poles, and as shown in FIG. 18, the upper side (Z1 side) is magnetized to the N pole and the lower side (Z2 side). ) Is magnetized to the S pole. That is, when the lower side (Z2 side) of each of the first magnet 22A and the second magnet 22B constituting the upper holding magnet 22 is attached to the N pole, the lower holding magnet 26 is formed. Each of the 1st magnet 26A and the 2nd magnet 26B is arranged so that the upper side (Z1 side) is the N pole.

Further, the first magnet 26A is fixed by an adhesive in a state of being in contact with the step portion SP1 formed in the cavity CV of the bobbin 23. Similarly, the second magnet 26B is fixed by the adhesive in a state of being in contact with the step portion SP2 formed in the cavity CV of the bobbin 23.

The coil spring 27 is an example of an urging member, and is configured so that the plunger 25 can be urged upward (Z1 direction) in the cavity CV of the bobbin 23. In this embodiment, the coil spring 27 is arranged in the cavity CV together with the plunger 25. Specifically, one end of the coil spring 27 is in contact with the lower end surface (Z2 side) of the main body 25 m of the plunger 25, and the other end is the upper surface (Z1 side) of the lower cover 28 attached to the bobbin 23. It is arranged in a compressed state in the cavity CV so as to be in contact with the surface).

The lower cover 28 is a substantially rectangular plate-shaped member that forms the lower surface of the first lens holding assembly LH1. In this embodiment, the lower cover 28 is made of a magnetic material and is configured to function as a yoke. Further, the lower cover 28 has six openings 28h through which the six protrusions 23q formed at the lower end of the bobbin 23 penetrate. In FIG. 17, only one of the six convex portions 23q is indicated by a reference numeral, and only one of the six openings 28h is indicated by a reference numeral. Further, one of the six openings 28h is formed as a notch that opens outward.

Further, in the present embodiment, the upper cover 20 and the lower cover 28 are configured to have the same shape. This is to reduce the number of parts.

The electromagnetic mechanism EM is a mechanism for moving the plunger 25 up and down by electromagnetic force in the cavity CV of the bobbin 23. In the present embodiment, the electromagnetic mechanism EM is mainly composed of an upper holding magnet 22, a bobbin 23, a coil 24, a plunger 25, and a lower holding magnet 26.

When a current flows in the first direction of the wire rod constituting the coil 24, as shown in FIG. 18A, the upper portion of the plunger 25 is excited to the N pole and the lower portion is excited to the S pole. Be excited. Therefore, the plunger 25 has a repulsive force (repulsive force) between the N pole of the upper holding magnet 22 and the N pole of the upper portion of the plunger 25, and the N pole of the lower holding magnet 26 and the lower side of the plunger 25. The suction force between the S pole and the portion moves in the direction indicated by the arrow AR3. At this time, the plunger 25 moves downward until the distance between the plunger 25 and the lower holding magnet 26 reaches the value GP1 while compressing the coil spring 27. The state in which the distance between the plunger 25 and the lower holding magnet 26 is the value GP1, that is, the state shown in FIG. 18A is the case where the supply of the current to the coil 24 is stopped. Is also maintained by the attractive force between the north pole of the lower holding magnet 26 and the unexcited plunger 25. In this embodiment, the plunger 25 and the lower holding magnet 26 are configured so as not to come into contact with each other. This is because when the plunger 25 and the lower holding magnet 26 come into contact with each other, a relatively large force is required to separate them.

When a current flows in the second direction of the wire rod constituting the coil 24, as shown in FIG. 18B, the upper portion of the plunger 25 is excited to the S pole and the lower portion is excited to the N pole. Be excited. Therefore, the plunger 25 has an attractive force between the N pole of the upper holding magnet 22 and the S pole of the upper portion of the plunger 25, and the N pole of the lower holding magnet 26 and the N pole of the lower portion of the plunger 25. Due to the repulsive force (repulsive force) between them and the restoring force of the coil spring 27, the magnet moves in the direction indicated by the arrow AR4. At this time, the plunger 25 is used until the distance between the plunger 25 and the upper holding magnet 22 reaches the value GP2, that is, the shoulder portion 25s of the plunger 25 (see FIG. 18A) and the cavity CV of the bobbin 23. It moves upward until it comes into contact with the step portion SP3 (see FIG. 18 (A)) as the stopper portion formed inside. In this embodiment, the plunger 25 and the upper holding magnet 22 are configured so as not to come into contact with each other. This is because when the plunger 25 and the upper holding magnet 22 come into contact with each other, a relatively large force is required to separate them.

With this configuration, the electromagnetic mechanism EM can move the plunger 25 up and down with a predetermined stroke amount (value SK) in the cavity CV of the bobbin 23.

The lock mechanism LK is a mechanism for mechanically fixing the movement of the plunger 25 in a state where the locking portion 25e of the plunger 25 and the notch CT (see FIG. 8) of the engaging member 10 are engaged with each other. In the present embodiment, the lock mechanism LK is mainly composed of an upper holding magnet 22, a bobbin 23, a plunger 25, and a coil spring 27.

The state in which the shoulder portion 25s of the plunger 25 and the step portion SP3 formed in the cavity CV of the bobbin 23 are in contact with each other, that is, the state shown in FIG. 18B is when the supply of current to the coil 24 is stopped. Even so, it is maintained by the attractive force between the north pole of the upper holding magnet 22 and the upper portion of the plunger 25.

With this configuration, even when the current supply to the coil 24 is stopped, the lock mechanism LK is in a state as shown in FIGS. 15 (A1) and 15 (A2), that is, the locking portion 25e and the notch. By engaging with the CT, it is possible to bring about a state in which the lens carrier 30 is held at the movement limit position.

In the above-described embodiment, as shown in FIG. 14, the holding mechanism HM is the first holding mechanism HM1 that holds the first lens holder 3A at the movement limit position on the front side (X1 side), and the rear side (X1 side). It is configured to include a second holding mechanism HM2 that holds the second lens holder 3B at the movement limit position on the X2 side). That is, the holding mechanism HM is configured to hold the first lens holder 3A at the movement limit position on the front side and hold the second lens holder 3B at the movement limit position on the rear side. However, the holding mechanism HM may be configured to hold the first lens holder 3A and the second lens holder 3B together at the movement limit position of either the front side or the rear side.

For example, as shown in FIG. 13A, the holding mechanism HM has a second lens holder when each of the first lens holder 3A and the second lens holder 3B is in the movement limit position on the rear side (X2 side). The notch CT of the engaging member attached to the end on the Y1 side of the first lens holder 3A located on the front side (X1 side) of 3B, and the second lens holding attached to the rear end of the first substrate 41A. By engaging with the locking portion 25e of the plunger 25 constituting the assembly LH2, both the first lens holder 3A and the second lens holder 3B may be held together. In this case, the first engaging member 10A, the second engaging member 10B, and the first lens holding assembly LH1 may be omitted.

Alternatively, as shown in FIG. 13B, for example, the holding mechanism HM has a first lens holder when each of the first lens holder 3A and the second lens holder 3B is in the movement limit position on the front side (X1 side). Notch CT of the engaging member attached to the end on the Y2 side of the second lens holder 3B located on the rear side (X2 side) of 3A, and the first lens holding attached to the front end of the second substrate 41B. By engaging with the locking portion 25e of the plunger 25 constituting the assembly LH1, both the first lens holder 3A and the second lens holder 3B may be held together. In this case, the first engaging member 10A, the second engaging member 10B, and the second lens holding assembly LH2 may be omitted.

As described above, the holding mechanism HM may be configured to hold both the first lens holder 3A and the second lens holder 3B together by one engaging member and one lens holding assembly.

Next, with reference to FIG. 19, the control of the lens holder drive device 101 mounted on the camera-equipped mobile device will be described. FIG. 19 is a block diagram showing a configuration example of a control system SYS that controls the lens holder drive device 101.

The control system SYS mainly includes the first Hall element 43A1, the second Hall element 43A2, the third Hall element 43A3, and the second magnetic in the first magnetic sensor set 43A, which are arranged in the lens holder drive device 101. The first Hall element 43B1, the second Hall element 43B2, and the third Hall element 43B3 in the sensor set 43B, the first coil 42A1 and the second coil 42A2 in the first coil set 42A, and the first coil in the second coil set 42B. 42B1 and the second coil 42B2, the coil 24 in the first lens holding assembly LH1, and the coil 24 in the second lens holding assembly LH2 are included as components.

Further, the control system SYS includes an input device ID, a control device CTR, and a power supply CS, which are arranged outside the lens holder drive device 101, as components.

The input device ID is a device for receiving an input to the control device CTR. In the example shown in FIG. 19, the input device ID is a touch panel installed in a portable device with a camera.

The control device CTR is configured to be able to control a power supply CS capable of supplying a current to the lens holder drive device 101. In the example shown in FIG. 19, the control device CTR has an input device ID, a first Hall element 43A1, a second Hall element 43A2, a third Hall element 43A3, and a second magnetic sensor set 43B in the first magnetic sensor set 43A. It is configured to control the power supply CS based on the information from the first Hall element 43B1, the second Hall element 43B2, the third Hall element 43B3, etc.

The power supply CS includes the first coil 42A1 and the second coil 42A2 in the first coil set 42A, the first coil 42B1 and the second coil 42B2 in the second coil set 42B, the coil 24 in the first lens holding assembly LH1, and the second coil. It is configured to be able to supply current individually to each of the coils 24 in the lens holding assembly LH2.

In the example shown in FIG. 19, the control device CTR can supply an appropriate amount of current to each component at an appropriate timing by controlling the power supply CS using the PWM control method.

Specifically, when the control device CTR receives the camera start signal from the input device ID, the coil 24 in the first lens holding assembly LH1 and the second lens holding assembly LH2 are controlled by PWM control of the power supply CS. A current is supplied to each of the coils 24 in.

The camera activation signal is a signal for activating the camera mounted on the camera-equipped mobile device. In the example shown in FIG. 19, the camera activation signal is output by the touch panel as the input device ID when the camera icon displayed on the touch panel display mounted on the camera-equipped mobile device is touch-operated.

When the coil 24 in the first lens holding assembly LH1 receives a current supply from the power supply CS, the plunger 25 moves downward (Z2 direction) as shown in FIG. 18A. That is, as shown in FIG. 15 (B2), the coil 24 has an end surface of the locking portion 25e of the plunger 25 located at a position higher than the upper surface of the first engaging member 10A as shown in FIG. 15 (A2). , Retract to a position lower than the lower surface of the first engaging member 10A. This is to release the engagement between the first engaging member 10A and the locking portion 25e. By this release, the first lens holder 3A can freely move in the optical axis direction. The same applies to the disengagement of the second engaging member 10B and the locking portion 25e by the coil 24 in the second lens holding assembly LH2.

After that, the control device CTR supplies a current to the first coil 42A1 in the first coil set 42A and the second coil 42B2 in the second coil set 42B by PWM controlling the power supply CS.

When the first coil 42A1 receives a current supply from the power supply CS, the first coil 42A1 moves away from the first drive magnet 6A by the magnetic force generated by the first coil 42A1, and the first coil 42A1 is at the movement limit position on the X1 side shown in FIG. 13B. 1 The lens body LS1 (first lens holder 3A) can be moved to the position shown in FIG. 12 (A).

Further, when the second coil 42A2 receives a current supply from the power supply CS, the first driving magnet 6A is attracted by the magnetic force generated by the second coil 42A2, and the first lens body at the position shown in FIG. 12 (A). The LS1 (first lens holder 3A) can be moved to the movement limit position on the X2 side shown in FIG. 13 (A).

Further, when the second coil 42A2 receives a reverse current supply from the power supply CS, the magnetic force generated by the second coil 42A2 moves the first drive magnet 6A away, and the second coil 42A2 moves on the X2 side as shown in FIG. 13 (A). The first lens body LS1 (first lens holder 3A) at the limit position can be moved to the position shown in FIG. 12 (A).

Further, when the first coil 42A1 receives a reverse current supply from the power supply CS, the first coil 42A1 attracts the first driving magnet 6A by the magnetic force generated by the first coil 42A1, and the first coil 42A1 is at the position shown in FIG. 12A. 1 The lens body LS1 (first lens holder 3A) can be moved to the movement limit position on the X1 side shown in FIG. 13 (B).

Similarly, when the second coil 42B2 receives a current supply from the power supply CS, the magnetic force generated by the second coil 42B2 keeps the second drive magnet 6B away, and the movement limit position on the X2 side shown in FIG. 12 (B). The second lens body LS2 (second lens holder 3B) in the above can be moved to the position shown in FIG. 12 (A).

Further, when the first coil 42B1 receives a current supply from the power supply CS, the second driving magnet 6B is attracted by the magnetic force generated by the first coil 42B1, and the second lens body at the position shown in FIG. 12 (A). The LS2 (second lens holder 3B) can be moved to the movement limit position on the X1 side shown in FIG. 13B.

Further, when the first coil 42B1 receives a reverse current supply from the power supply CS, the magnetic force generated by the first coil 42B1 moves the second drive magnet 6B away, and the movement on the X1 side shown in FIG. 13B. The second lens body LS2 (second lens holder 3B) at the limit position can be moved to the position shown in FIG. 12 (A).

Further, when the second coil 42B2 receives a reverse current supply from the power supply CS, the second coil 42B2 attracts the second drive magnet 6B by the magnetic force generated by the second coil 42B2, and is located at the position shown in FIG. 12 (A). The two-lens body LS2 (second lens holder 3B) can be moved to the movement limit position on the X2 side shown in FIG. 12 (B).

The control device CTR determines the position of the first drive magnet 6A (first lens holder 3A) based on the respective outputs of the first Hall element 43A1 to the third Hall element 43A3 constituting the first magnetic sensor set 43A. Can be identified. Therefore, when the control device CTR moves the first lens body LS1 (first lens holder 3A) in the optical axis direction, the control device CTR is based on the respective outputs of the first Hall element 43A1 to the third Hall element 43A3, and the first coil. The direction and magnitude of the current supplied to each of the first coil 42A1 and the second coil 42A2 constituting the set 42A can be feedback-controlled.

Similarly, the control device CTR is the position of the second drive magnet 6B (second lens holder 3B) based on the respective outputs of the first Hall element 43B1 to the third Hall element 43B3 constituting the second magnetic sensor set 43B. Can be identified. Therefore, when the control device CTR moves the second lens body LS2 (second lens holder 3B) in the optical axis direction, the control device CTR is based on the respective outputs of the first Hall element 43B1 to the third Hall element 43B3, and the second coil. The direction and magnitude of the current supplied to each of the first coil 42B1 and the second coil 42B2 constituting the set 42B can be feedback-controlled.

After that, when the control device CTR receives the camera stop signal from the input device ID, the control device CTR moves the first lens body LS1 (first lens holder 3A) to the movement limit position on the X1 side by PWM controlling the power supply CS. The second lens body LS2 (second lens holder 3B) is moved to the movement limit position on the X2 side.

The camera stop signal is a signal for stopping the function of the camera mounted on the camera-equipped mobile device. In the example shown in FIG. 19, the camera stop signal is the input device ID when the software button for stopping the function of the camera displayed on the touch panel display mounted on the camera-equipped mobile device is touch-operated. Is output by the touch panel as.

After moving the first lens holder 3A to the movement limit position on the X1 side and moving the second lens holder 3B to the movement limit position on the X2 side, the control device CTR transfers the coil in the first lens holding assembly LH1. A current is supplied to each of the 24 and the coil 24 in the second lens holding assembly LH2 in the direction opposite to that when the camera start signal is received.

The control device CTR can determine whether or not the first lens holder 3A (first driving magnet 6A) has reached the movement limit position on the X1 side based on the output of the first Hall element 43A1 and can be the first. Based on the output of the 3-hole element 43B3, it can be determined whether or not the second lens holder 3B (second drive magnet 6B) has reached the movement limit position on the X2 side.

When the coil 24 in the first lens holding assembly LH1 receives a reverse current supply from the power supply CS, the plunger 25 moves upward (Z1 direction) as shown in FIG. 18B. That is, as shown in FIG. 15 (A2), the coil 24 has an end surface of the locking portion 25e of the plunger 25 located at a position lower than the lower surface of the first engaging member 10A as shown in FIG. 15 (B2). , Push out to a position higher than the upper surface of the first engaging member 10A. This is to engage the first engaging member 10A and the locking portion 25e. Due to this engagement, the first lens holder 3A is prohibited from moving in the optical axis direction. The same applies to the engagement between the second engaging member 10B and the locking portion 25e by the coil 24 in the second lens holding assembly LH2.

As described above, the lens holder drive device 101 according to the embodiment of the present invention includes a fixed side member FM, a lens holder 3 capable of holding the lens body LS, and a drive mechanism for moving the lens holder 3 in the optical axis direction. It includes a DM and a holding mechanism HM that holds the lens holder 3 at a movement limit position, which is a position on the end side of a movable range in the optical axis direction. The holding mechanism HM is provided on the fixed side member FM, and includes a plunger 25 as a moving body including a locking portion 25e that advances and retreats in a direction intersecting the optical axis direction, and an electromagnetic mechanism EM that advances and retreats the plunger 25. An engaging member 10 provided on the movable side member MB including the lens holder 3 and having a notch CT as an engaging portion on which the locking portion 25e can be engaged, and a moving end portion of the lens holder 3 in the optical axis direction. It is provided with a lock mechanism LK that holds the plunger 25 in a state where the locking portion 25e and the notch CT are engaged with each other at the movement limit position, which is the position.

In this configuration, the lens holder drive device 101 holds the lens holder 3 at the movement limit position by realizing the engagement between the locking portion 25e of the plunger 25 and the notch CT of the engaging member 10. By releasing the case, the lens holder 3 can be moved in the optical axis direction. Therefore, the lens holder drive device 101 can ensure that the lens holder 3 is held at the movement limit position. Further, the lens holder drive device 101 can hold the lens holder 3 at the movement limit position without utilizing the frictional force generated when a part of the fixed side member and a part of the movable side member are brought into frictional contact with each other. .. Therefore, this configuration does not adversely affect the movement of the lens holder 3 when the engagement is released, and the force for holding the lens holder 3 at the movement limit position does not change with time.

The plunger 25 may be configured to include a magnetic member. In this embodiment, the plunger 25 is made of a magnetic material. Then, as shown in FIG. 18B, the lock mechanism LK has an upper holding magnet 22 as a first holding magnet that attracts the magnetic member or the plunger 25 itself and holds the plunger 25 at the locked position. May be. The lock position means the position of the plunger 25 when the locking portion 25e of the plunger 25 and the notch CT of the engaging member 10 are engaged with each other. Further, the state in which the plunger 25 is in the locked position is referred to as a "locked state".

With this configuration, the lens holder drive device 101 does not need to continue to drive the electromagnetic mechanism EM in order to hold the plunger 25 in the locked position. That is, the lens holder drive device 101 can continue to hold the plunger 25 in the locked position even when the supply of the current to the coil 24 in the lens holding assembly LH is stopped. Therefore, this configuration can suppress the power consumption of the lens holder drive device 101. However, the lens holder drive device 101 may maintain the locked state by continuously supplying a current to the coil 24 in the lens holding assembly LH.

Further, as shown in FIG. 18A, the lock mechanism LK has a lower holding magnet 26 as a second holding magnet that attracts the magnetic member and holds the plunger 25 in the non-locked position. May be good. The non-locking position means the position of the plunger 25 when the engagement between the locking portion 25e of the plunger 25 and the notch CT of the engaging member 10 is released. Further, a state other than the locked state including the state in which the plunger 25 is in the unlocked position is referred to as a “non-locked state”.

With this configuration, the lens holder drive device 101 does not need to continue to drive the electromagnetic mechanism EM in order to hold the plunger 25 in the unlocked position. That is, the lens holder drive device 101 can continue to hold the plunger 25 in the unlocked position even when the supply of the current to the coil 24 in the lens holding assembly LH is stopped. Therefore, this configuration can suppress the power consumption of the lens holder drive device 101. However, the lens holder drive device 101 may maintain the unlocked state by continuously supplying a current to the coil 24 in the lens holding assembly LH.

As shown in FIG. 18, the upper holding magnet 22 and the lower holding magnet 26 may be arranged to face each other with the plunger 25 as a magnetic member interposed therebetween. This configuration can suppress the increase in size of the lens holding assembly LH.

The plunger 25 as a mobile body may be an iron core. In this case, as shown in FIG. 18, the electromagnetic mechanism EM includes a plunger 25 as an iron core, a bobbin 23 arranged on the outer peripheral side of the plunger 25, and a coil 24 held on the outer periphery of the bobbin 23. It may have been done. This configuration can realize a low cost of the lens holding assembly LH.

The lock mechanism LK has a coil spring 27 that urges the plunger 25 as a moving body toward the locked position, and the plunger 25 compresses the coil spring 27 at the non-locked position as shown in FIG. 18 (A). It may be configured in. This configuration can reliably prevent the plunger 25 from coming into contact with the lower holding magnet 26. In addition, this configuration can facilitate the movement of the plunger 25 from the unlocked position to the locked position. This is because in the non-locked position, the plunger 25 is always urged upward by the coil spring 27. In addition, this configuration can prevent the camera-equipped mobile device equipped with the lens holder drive device 101 from being accidentally released from the locked state and being in the unlocked position when it receives an impact such as dropping. .. This is because, in the example shown in FIG. 18B, the plunger 25 is always urged upward by the coil spring 27 even in the locked position. Specifically, in the state shown in FIG. 18B, the coil spring 27 urges the plunger 25 upward with a restoring force larger than the attractive force by which the lower holding magnet 26 attracts the plunger 25 downward. Because.

The bobbin 23 may be configured to have a stopper portion (step SP3) that comes into contact with the plunger 25 as an iron core at the locked position. This configuration can reliably prevent the plunger 25 from coming into contact with the upper holding magnet 22.

A yoke 21 constituting the electromagnetic mechanism EM may be arranged on the outside of the coil 24. This configuration can suppress the leakage of the magnetic field (magnetic flux) generated by the electromagnetic mechanism EM.

Even if the drive mechanism DM is composed of a drive magnet 6 provided on one side of the lens holder 3 and a drive coil (a coil constituting the coil set 42) facing the drive magnet 6. good. The electromagnetic mechanism EM may be arranged so as to face the other side portion of the lens holder 3. That is, the electromagnetic mechanism EM may be arranged away from the driving magnet 6.

For example, as shown in FIG. 12A, the first drive mechanism DM1 is attached to the side portion SB1 on the Y1 side of the first lens holder 3A capable of holding the first lens body LS1 (see FIG. 15A). It may be composed of a first drive magnet 6A provided, and a first coil 42A1 and a second coil 42A2 facing the first drive magnet 6A. In this case, the electromagnetic mechanism EM in the first lens holding assembly LH1 may be arranged so as to face the side portion SB2 on the Y2 side of the first lens holder 3A, as shown in FIG. 15 (A1).

Further, as shown in FIG. 12A, the second drive mechanism DM2 is a second drive magnet 6B (2) provided on the Y2 side side of the second lens holder 3B capable of holding the second lens body LS2. (See FIG. 5) and the first coil 42B1 and the second coil 42B2 facing the second drive magnet 6B may be configured. In this case, the electromagnetic mechanism EM in the second lens holding assembly LH2 may be arranged so as to face the Y1 side side portion of the second lens holder 3B.

This configuration can prevent interference between the magnetism generated by the driving magnet 6 and the magnetism generated by the electromagnetic mechanism EM. This is because the driving magnet 6 and the electromagnetic mechanism EM are configured so as not to be excessively close to each other.

Further, the lens holder drive device 101 according to the embodiment of the present invention has, for example, as shown in FIGS. 3 and 4, a fixed side member FM, a first lens holder 3A capable of holding the first lens body LS1, and a first lens holder 3A. , The movable side member MB including the second lens holder 3B capable of holding the second lens body LS2 arranged so as to have the same optical axis JD as the first lens body LS1, and the first lens holder 3A in the optical axis direction. It includes a first drive mechanism DM1 for moving the lens holder 3B and a second drive mechanism DM2 for moving the second lens holder 3B in the optical axis direction.

The fixed side member FM has a first coil assembly 4A (first substrate 41A) and a second surface as first surfaces provided so as to face each other with the first lens holder 3A and the second lens holder 3B interposed therebetween. It has a second coil assembly 4B (second substrate 41B) as a lens. As shown in FIG. 7, the first coil assembly 4A is provided with a first coil set 42A, and the second coil assembly 4B is provided with a second coil set 42B. Further, as shown in FIG. 4, the first drive magnet 6A facing the first coil assembly 4A (first coil set 42A) is fixed to the first lens holder 3A. Further, as shown in FIG. 5, the second drive magnet 6B facing the second coil assembly 4B (second coil set 42B) is fixed to the second lens holder 3B. The first drive magnet 6A and the first coil set 42A form the first drive mechanism DM1, and the second drive magnet 6B and the second coil set 42B form the second drive mechanism DM2.

This configuration, in which the first lens holder 3A and the second lens holder 3B can be moved separately, can promote the miniaturization of the lens holder drive device 101 as compared with the configuration including two rotary electric motors. Further, this configuration can prevent the first drive mechanism DM1 and the second drive mechanism DM2 from magnetically interfering with each other. This is because the first drive mechanism DM1 and the second drive mechanism DM2 are arranged so as to sandwich the first lens holder 3A and the second lens holder 3B. That is, the first drive mechanism DM1 and the second drive mechanism DM2 are arranged at a sufficient distance from each other.

The first coil set 42A is composed of one or more coils, and the second coil set 42B is composed of one or more coils.

In this embodiment, as shown in FIG. 7, the first coil set 42A includes the first coil 42A1 and the second coil 42A2, and the second coil set 42B includes the first coil 42B1 and the second coil 42B2. As shown in FIG. 13A, the width W5, which is the dimension of the first drive magnet 6A in the optical axis direction, is the dimension of the first coil 42A1 constituting the first coil set 42A in the optical axis direction. It is different from the width W7. The width W7 of the first coil 42A1 is the same as the width of the second coil 42A2.

Further, as shown in FIG. 13B, when the first lens holder 3A (first lens body LS1) is located at one end of the movable range of the movable side member MB on the X1 side, it is used for the first drive. The central axis M1 which is the central position in the optical axis direction of the magnet 6A is located at a position away from the central axis L1 which is the central position in the optical axis direction of the first coil 42A1 constituting the first coil set 42A. That is, the central axis M1 of the first drive magnet 6A and the central axis L1 of the first coil 42A1 do not match.

Further, as shown in FIG. 13A, the width W6, which is the dimension of the second drive magnet 6B in the optical axis direction, is the dimension of the first coil 42B1 constituting the second coil set 42B in the optical axis direction. It is different from the width W8. The width W8 of the first coil 42B1 is the same as the width of the second coil 42B2.

Further, as shown in FIG. 13A, when the second lens holder 3B (second lens body LS2) is located at the end on the X2 side, which is the other end of the movable range of the movable side member MB, the second drive is performed. The central axis M2, which is the central position of the magnet 6B in the optical axis direction, is located away from the central axis L4, which is the central position of the second coil 42B2 constituting the second coil set 42B in the optical axis direction. That is, the central axis M2 of the second drive magnet 6B and the central axis L4 of the second coil 42B2 do not match.

With this configuration, in the lens holder drive device 101, for example, as shown in FIG. 13 (B), even when the first lens holder 3A is located at the front end (end on the X1 side) of the movable range, the first coil When a current is supplied to 42A1, the first lens holder 3A can be reliably moved backward (in the X2 direction). When the central axis L1 of the first drive magnet 6A and the central axis M1 of the first coil 42A1 match, the repulsive force that tries to move the first drive magnet 6A forward (in the X1 direction) and There is a risk that the repulsive force that tries to move the first drive magnet 6A backward (in the X2 direction) will be balanced, but this configuration is specific so that the central axis L1 and the central axis M1 do not match. Since the central axis L1 is configured to be located on the front side of the central axis M1, the force for moving the first drive magnet 6A to the front side and the force for moving the first drive magnet 6A to the rear side are balanced. You can prevent that.

Further, as shown in FIGS. 4 and 5, the width W3, which is the dimension of the first lens holder 3A in the optical axis direction, is larger than the width W4, which is the dimension of the second lens holder 3B in the optical axis direction. Further, as shown in FIG. 13A, the width W5, which is the dimension of the first drive magnet 6A in the optical axis direction, is larger than the width W6, which is the dimension of the second drive magnet 6B in the optical axis direction. In the example shown in FIG. 13, the height of the first drive magnet 6A is the same as the height of the second drive magnet 6B.

With this configuration, in the first drive mechanism DM1, even if the first lens holder 3A is larger than the second lens holder 3B, the first drive magnet 6A is larger than the second drive magnet 6B, so that the first lens holder 3A Can generate enough thrust to move the lens.

Further, as shown in FIG. 13A, the width W7, which is the respective dimensions of the first coil 42A1 and the second coil 42A2 constituting the first coil set 42A in the optical axis direction, is the second coil in the optical axis direction. It is larger than the width W8, which is the respective dimensions of the first coil 42B1 and the second coil 42B2 constituting the set 42B. In the example shown in FIG. 13, the height H1 of each of the first coil 42A1 and the second coil 42A2 constituting the first coil set 42A is the first coil 42B1 constituting the second coil set 42B. And the height H2 of the second coil 42B2 is the same.

With this configuration, in the first drive mechanism DM1, even if the first lens holder 3A is larger than the second lens holder 3B, the first coil 42A1 and the second coil 42A2 are each of the first coil 42B1 and the second coil 42B2, respectively. Because it is larger than, it is possible to generate sufficient thrust to move the first lens holder 3A.

Basically, the wider the width of the driving magnet 6, the larger the distance between two adjacent coils in the optical axis direction, which is necessary to realize the desired amount of movement of the lens holder 3. The number of coils can be reduced. Reducing the number of coils brings about a reduction in the power consumption of the lens holder drive device 101.

On the other hand, when the number of coils required to realize the desired amount of movement of the lens holder 3 is large, the individual coils are made smaller to reduce the power consumption of the individual coils, thereby causing the lens holder drive device. The power consumption of 101 can be reduced.

Further, as shown in FIG. 13B, in the Y-axis direction which is the direction perpendicular to the optical axis, the second coil 42A2 constituting the first coil set 42A and the second coil 42B2 constituting the second coil set 42B are formed. Partially overlaps with.

Specifically, in the example shown in FIG. 13B, the arrangement region of the first coil set 42A has a width W9, and the arrangement region of the second coil set 42B has a width W10. Then, in the Y-axis direction, which is the direction perpendicular to the optical axis, the arrangement region of the first coil set 42A and the arrangement region of the second coil set 42B partially overlap each other. The overlap width is indicated by the width W11.

With this configuration, the lens holder drive device 101 can partially overlap the movable range of the first lens holder 3A and the movable range of the second lens holder 3B.

Desirably, as shown in FIG. 7, the first coil assembly 4A as the first surface is provided with a plurality of coils (first coil 42A1 and second coil 42A2), and the second coil assembly as the second surface. Also in 4B, a plurality of coils (first coil 42B1 and second coil 42B2) are provided.

With this configuration, the lens holder drive device 101 can increase the amount of movement of the first lens holder 3A as compared with the case where one coil is provided in the first coil assembly 4A. Similarly, the lens holder drive device 101 can increase the amount of movement of the second lens holder 3B as compared with the case where one coil is provided in the second coil assembly 4B.

Further, as shown in FIG. 13B, when the first lens holder 3A (first lens body LS1) is located at the end on the X1 side, which is one end of the movable range of the movable side member MB, the first driving magnet The first holding magnet 12A (front magnet 12A1) that attracts 6A may be provided on the coil holder 5 (see FIG. 6) as the fixed side member FM.

Further, as shown in FIG. 13 (A), when the second lens holder 3B (second lens body LS2) is located at the end on the X2 side which is the other end of the movable range of the movable side member MB, it is used for the second drive. The second holding magnet 12B (rear side magnet 12B2) that attracts the magnet 6B may be provided on the coil holder 5 (see FIG. 6) as the fixed side member FM.

With this configuration, the lens holder drive device 101 can attract the lens holder 3 to the end of the movable range by magnetic force, and can hold the lens holder 3 at the end of the movable range.

As shown in FIGS. 4 and 5, even if the lens holder drive device 101 includes two grooves 5G (first groove 5G1 and second groove 5G2) that guide the movement of the movable side member MB in the optical axis direction. good. The lens holder drive device 101 may be provided with one or three or more grooves instead of the two grooves 5G, or may be provided with one or more guide rails, or one or a plurality of guides. It may be provided with a shaft.

With this configuration, the lens holder drive device 101 can smoothly move the lens holder 3 in the optical axis direction.

The fixed-side member FM may have a coil holder 5 as a base member BM having a groove 5G, and a cover member 1 fixed to the base member BM. The movable side member MB may hold the ball on the upper side and the lower side, and the ball held on the upper side of the movable side member MB may be urged against the ceiling surface of the cover member 1.

For example, as shown in FIG. 11A, the first lens carrier 30A of the first lens holder 3A constituting the movable side member MB holds the lower ball set 8 on the lower side and the upper ball on the upper side. It may be configured to hold the set 9. The upper ball set 9 may be pressed against the ceiling surface of the cover member 1 by the first spring set 31A.

With this configuration, the lens holder drive device 101 can suppress the frictional resistance when the lens holder 3 moves.

The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the above-described embodiment. Various modifications and substitutions can be applied to the above-described embodiments without departing from the scope of the present invention. Further, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical conflict.

For example, in the above embodiment, as shown in FIG. 18, the first lens holding assembly LH1 advances and retreats the locking portion 25e in a direction parallel to the Z axis, which is one of the directions orthogonal to the optical axis direction. It is configured in. However, the first lens holding assembly LH1 may be configured to advance or retreat the locking portion 25e in a direction parallel to the Y axis. In this case, the central axis of the coil 24 in the first lens holding assembly LH1 may be arranged so as to be parallel to the Y axis. Alternatively, the first lens holding assembly LH1 is configured to advance and retreat the locking portion 25e in a direction not orthogonal to the optical axis direction, for example, a direction inclined with respect to the optical axis direction or a direction parallel to the optical axis direction. It may have been done. In this case, the engaging portion of the first engaging member 10A is formed so as to properly mesh with the locking portion 25e. The same applies to the second lens holding assembly LH2.

Further, in the above-described embodiment, in the first coil 42A1 and the second coil 42A2 constituting the first coil set 42A, the coil axis, which is the winding center of the coil, is parallel to the Y axis, but the optical axis It may be a coil having a coil axis parallel to the JD. The same applies to the second coil set 42B.

1 ... Cover member 1s ... Storage part 1A ... Outer wall part 1A1 ... 1st side plate part 1A2 ... 2nd side plate part 1A3 ... 3rd side plate part 1A4 ... 4th side plate part 1B ... Top surface 2 ... Base plate 3 ... Lens holder 3A ... 1st lens holder 3B ... 2nd lens holder 4 ... Coil assembly 4A ... 1st coil assembly 4B ...・ 2nd coil assembly 5 ・ ・ ・ Coil holder 5G ・ ・ ・ Groove 5G1 ・ ・ ・ 1st groove 5G2 ・ ・ ・ 2nd groove 6 ・ ・ ・ Drive magnet 6A ・ ・ ・ 1st drive magnet 6B ・ ・ ・2nd drive magnet 7 ... Plate-shaped member 7A ... 1st plate-shaped member 7B ... 2nd plate-shaped member 8 ... Lower ball set 8A ... 1st lower ball set 8A1.・ ・ 1st ball 8A2 ・ ・ ・ 2nd ball 8A3 ・ ・ ・ 3rd ball 8A4 ・ ・ ・ 4th ball 8B ・ ・ ・ 2nd lower ball set 8B1 ・ ・ ・ 1st ball 8B2 ・ ・ ・ 2nd ball 8B3 ... 3rd ball 8B4 ... 4th ball 9 ... Upper ball set 9A ... 1st upper ball set 9A1 ... 1st ball 9A2 ... 2nd ball 9A3 ... 3rd Ball 9A4 ... 4th ball 9B ... 2nd upper ball set 9B1 ... 1st ball 9B2 ... 2nd ball 9B3 ... 3rd ball 9B4 ... 4th ball 10 ... Combined member 10A ... 1st engaging member 10B ... 2nd engaging member 12 ... Holding magnet 12A ... 1st holding magnet 12A1 ... Front magnet 12A2 ... Rear magnet 12B・ ・ ・ Second holding magnet 12B1 ・ ・ ・ Front side magnet 12B2 ・ ・ ・ Rear side magnet 20 ・ ・ ・ Upper cover 20h, 20k ・ ・ ・ Opening 21 ・ ・ ・ York 22 ・ ・ ・ Upper holding magnet 22A ・ ・ ・・ 1st magnet 22B ・ ・ ・ 2nd magnet 23 ・ ・ ・ bobbin 23n ・ ・ ・ constriction 23p, 23q ・ ・ ・ convex part 24 ・ ・ ・ coil 25 ・ ・ ・ plunger 25e ・ ・ ・ locking part 25m ・ ・・ Main body 25s ・ ・ ・ Shoulder 26 ・ ・ ・ Lower holding magnet 26A ・ ・ ・ First magnet 26B ・ ・ ・ Second magnet 27 ・ ・ ・ Coil spring 28 ・ ・ ・ Lower cover 28h ・ ・ ・ Opening 30・ ・ ・ Lens carrier 30A ... 1st lens carrier 30B ... 2nd lens carrier 31 ... Spring set 31A ... 1st spring set 31A1 ... 1st coil spring 31A2 ... 2nd coil spring 31A3 ... 3rd coil spring 31A4・ ・ ・ 4th coil spring 31B ・ ・ ・ 2nd spring set 31B1 ・ ・ ・ 1st coil spring 31B2 ・ ・ ・ 2nd coil spring 31B3 ・ ・ ・ 3rd coil spring 31B4 ・ ・ ・ 4th coil spring 32 ・ ・ ・ Push bar set 32A ・・ ・ 1st push bar set 32A1 ・ ・ ・ 1st push bar 32A2 ・ ・ ・ 2nd push bar 32B ・ ・ ・ 2nd push bar set 32B1 ・ ・ ・ 1st push bar 32B2 ・ ・ ・ 2nd push bar 41 ・・ ・ Board 41A ・ ・ ・ 1st board 41B ・ ・ ・ 2nd board 42 ・ ・ ・ Coil set 42A ・ ・ ・ 1st coil set 42A1 ・ ・ ・ 1st coil 42A2 ・ ・ ・ 2nd coil 42B ・ ・ ・ No. 2 coil set 42B1 ... 1st coil 42B2 ... 2nd coil 43 ... Magnetic sensor set 43A ... 1st magnetic sensor set 43A1 ... 1st Hall element 43A2 ... 2nd Hall element 43A3 ... 3rd Hall element 43B ... 2nd magnetic sensor set 43B1 ... 1st Hall element 43B2 ... 2nd Hall element 43B3 ... 3rd Hall element 101 ... Lens holder drive device AP.・ ・ Opening AX ・ ・ ・ Protruding part AX1 ・ ・ ・ 1st protruding part AX2 ・ ・ ・ 2nd protruding part AX3 ・ ・ ・ 3rd protruding part AX4 ・ ・ ・ 4th protruding part BL ・ ・ ・ Rising part BM ・ ・・ Base member CM ・ ・ ・ Camera module CP ・ ・ ・ Connection part CS ・ ・ ・ Power supply CT ・ ・ ・ Notch CTR ・ ・ ・ Control device CU ・ ・ ・ Notch CV ・ ・ ・ Cavity DM ・ ・ ・ Drive mechanism DM1 ... 1st drive mechanism DM2 ... 2nd drive mechanism EM ... Electromagnetic mechanism FM ... Fixed side member HL ... Hole HL1 ... 1st hole HL2 ... 2nd hole HL3 ...・ 3rd hole HL4 ・ ・ ・ 4th hole HM ・ ・ ・ Holding mechanism HS ・ ・ ・ Housing ID ・ ・ ・ Input device IS ・ ・ ・ Image sensor JD ・ ・ ・ Optical axis LH ・ ・ ・ Lens holding assembly LH1 ・・ ・ First lens holding assembly LH2 ... 2nd lens holding assembly LK ... Lock mechanism LM ... Lower member LS ... Lens body LS1 ... 1st lens body LS2 ... 2nd lens body LT ... Optical MB・ ・ ・ Movable side member MR ・ ・ ・ Mirror PR ・ ・ ・ Convex part RS1 ～ RS11 ・ ・ ・ Concave part SL1, SL2 ・ ・ ・ Slope SP1 ～ SP3 ・ ・ ・ Step part SYS ・ ・ ・ Control system

Claims (9)

Fixed side member and
A movable side member including a first lens holder capable of holding the first lens body and a second lens holder capable of holding the second lens body arranged so as to have the same optical axis as the first lens body.
A first drive mechanism that moves the first lens holder in the optical axis direction,
In a lens holder drive device including a second drive mechanism for moving the second lens holder in the optical axis direction.
The fixed-side member has a first surface and a second surface provided so as to face each other with the first lens holder and the second lens holder interposed therebetween.
A first coil is provided on the first surface.
A second coil is provided on the second surface, and a second coil is provided.
The first driving magnet facing the first coil is fixed to the first lens holder, and the magnet is fixed to the first lens holder.
The second driving magnet facing the second coil is fixed to the second lens holder, and the magnet is fixed to the second lens holder.
The first drive magnet and the first coil form the first drive mechanism.
The second drive magnet and the second coil constitute the second drive mechanism.
A lens holder drive device characterized by this. The dimensions of the first drive magnet in the optical axis direction are different from the dimensions of the first coil in the optical axis direction.
When the first lens holder is located at one end of the movable range of the movable side member, the center position of the first driving magnet in the optical axis direction is separated from the center position of the first coil in the optical axis direction. In position,
The dimensions of the second drive magnet in the optical axis direction are different from the dimensions of the second coil in the optical axis direction.
When the second lens holder is located at the other end of the movable range of the movable side member, the center position of the second driving magnet in the optical axis direction is separated from the center position of the second coil in the optical axis direction. In the same position,
The lens holder drive device according to claim 1. The dimension of the first lens holder in the optical axis direction is larger than the dimension of the second lens holder in the optical axis direction.
The dimension of the first drive magnet in the optical axis direction is larger than the dimension of the second drive magnet in the optical axis direction.
The lens holder driving device according to claim 1 or 2. The dimension of the first coil in the optical axis direction is larger than the dimension of the second coil in the optical axis direction.
The lens holder driving device according to claim 3. The first coil and the second coil partially overlap in a direction perpendicular to the optical axis.
The lens holder driving device according to any one of claims 1 to 4. A plurality of first coils are provided on the first surface, and a plurality of first coils are provided.
A plurality of second coils are provided on the second surface.
The lens holder driving device according to any one of claims 1 to 5. When the first lens holder is located at one end of the movable range of the movable side member, the fixed side member is provided with a first holding magnet that attracts the first driving magnet.
The lens holder driving device according to any one of claims 1 to 6. The fixed-side member comprises two grooves that guide the movement of the movable-side member in the optical axis direction.
The lens holder driving device according to any one of claims 1 to 7. The fixed-side member has a base member having the groove and a cover member fixed to the base member.
The movable side member holds the ball on the upper side and the lower side.
The ball held on the upper side of the movable side member is urged against the ceiling surface of the cover member.
The lens holder drive device according to claim 8.

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