JP2023123888A - Lens holder driving device - Google Patents

Abstract

To provide a device capable of holding a lens holder more appropriately at a desired position.SOLUTION: A lens holder driving device comprises: a fixed-side member; a lens holder 3 capable of holding a lens body; a drive mechanism for moving the lens holder 3 in an optical axis direction; and a holding mechanism HM for holding the lens holder 3 at a position on an end side in a movable range in the optical axis direction. The holding mechanism HM comprises: a plunger including an engaging portion moving forward and backward in a direction crossing the optical axis direction and an electromagnetic mechanism for moving the plunger forward and backward, which are provided on the fixed-side member; an engaging member 10 which is provided on a movable-side member including the lens holder 3, and has a cutout with which the engaging portion can be engaged; and a lock mechanism for holding the plunger in a state in which the engaging portion and the cutout are engaged, at the position on the end side in the movable range of the lens holder 3 in the optical axis direction.SELECTED DRAWING: Figure 14

Description

The present disclosure relates to a lens holder driving device.

2. Description of the Related Art Conventionally, there is known a lens driving device provided with an autofocus drive section for moving a lens holder as an autofocus movable section including a lens in the optical axis direction (see Patent Document 1). In this lens driving device, the lens holder is movably supported in the optical axis direction by a spring attached to the autofocus fixing portion. This lens driving device is configured to have a self-holding mechanism for holding the position of the lens holder in the optical axis direction.

JP 2016-224222 A

However, in the lens driving device described above, the self-holding mechanism is configured to utilize the frictional force generated between the pad attached to the lens holder and the shaft attached to the autofocus fixing portion. In this configuration, the magnitude of the friction force should be adjusted appropriately. This is because if the frictional force is too large, the driving force required to move the lens holder in the optical axis direction becomes too large. This is because it becomes impossible to hold the

Therefore, it is desired to provide a device that can more appropriately hold the lens holder at a desired position.

A lens holder driving device according to an embodiment of the present invention includes a stationary member, a lens holder capable of holding a lens body, a drive mechanism for moving the lens holder in the optical axis direction, and a lens holder that moves the lens holder in the optical axis direction. and a holding mechanism for holding a position on the end side of the movable range in the lens holder driving device, wherein the holding mechanism is provided on the fixed side member and is a locking mechanism that advances and retreats in a direction intersecting the optical axis direction. an electromagnetic mechanism for advancing and retracting the moving body; an engaging member provided on the movable side member including the lens holder and having an engaging portion with which the locking portion can be engaged; a lock mechanism that holds the moving body in a state where the locking portion and the engaging portion are engaged at a position on the end side of the movable range of the lens holder in the axial direction.

The lens holder driving device described above can more appropriately hold the lens holder at the desired position.

It is a perspective view of a lens holder drive. 1 is a schematic diagram of a camera module; FIG. It is an exploded perspective view of a lens holder drive. FIG. 4 is an exploded perspective view of a lower member; FIG. 4 is an exploded perspective view of a lower member; FIG. 4 is an exploded perspective view of a fixed-side member that constitutes the lower member; 4 is an exploded perspective view of the coil assembly; FIG. It is an exploded perspective view of a movable side member. It is an exploded perspective view of a lens holder. It is the top view and bottom view of a lens holder. It is a sectional view of a lens holder drive. FIG. 4 is a top view of a member that constitutes the drive mechanism; FIG. 4 is a top view of a member that constitutes the drive mechanism; FIG. 4 is a perspective view of a lower member; 4A and 4B are a perspective view and a front view of a holding mechanism; FIG. It is an exploded perspective view of a fixed side member. Fig. 10 is an exploded perspective view of the lens retention assembly; Fig. 10 is a cross-sectional view of the lens retention assembly; It is a block diagram which shows the structural example of the control system which controls a lens holder drive.

A lens holder driving device 101 according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the lens holder driving device 101. FIG. FIG. 2 is a schematic diagram of a camera module CM in a camera-equipped mobile device on which the lens holder driving device 101 is mounted.

As shown in FIG. 1, the lens holder driving device 101 is configured 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 forming the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X-axis. Y1 represents one direction of the Y-axis forming the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y-axis. Similarly, Z1 represents one direction of the Z-axis forming the three-dimensional orthogonal 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 drawings.

The lens body LS is an example of an optical member and is composed of one or more lenses. Typically, the lens body LS is a cylindrical lens barrel with at least one lens, and its central axis is arranged along the optical axis JD. In this embodiment, the lens body LS includes a first lens body LS1 and a second lens body LS2.

The lens holder driving device 101 is configured such that the lens body LS can be moved along the optical axis direction by the driving mechanism DM (see FIG. 3) accommodated 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 driving device 101 can move the first lens body LS1 along the optical axis direction as indicated by the double arrow AR1, and move the second lens body LS1 as indicated by the double arrow AR2. LS2 can be moved along the optical axis direction. That is, the lens holder driving device 101 can separately move the first lens body LS1 and the second lens body LS2 along the optical axis direction.

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

For example, as shown in FIG. 2, the lens holder driving device 101 is used in a camera module CM such as a periscope 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 driving device 101, an imaging element IS, and the like. The mirror MR as reflector may be a prism. In this embodiment, mirror MR is configured to provide a flat reflective surface.

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

Next, an outline of the lens holder driving device 101 will be described with reference to FIGS. 3 to 5. FIG. FIG. 3 is an exploded perspective view of the lens holder driving device 101, showing a state where 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 member MB is separated from the fixed member FM. Specifically, FIG. 4 is an exploded perspective view of the lower member LM seen from the Y1 side, and FIG. 5 is an exploded perspective view of the lower member LM seen from the Y2 side.

The lens holder driving device 101, as shown in FIG. 3, includes a cover member 1 that is a part of the fixed side member FM and a lower side member LM.

The cover member 1 is configured to cover the lower member LM. In this embodiment, the cover member 1 is produced by punching, drawing, and the like on a plate material formed of a non-magnetic material such as austenitic stainless steel. Since the cover member 1 is made of a non-magnetic material, the cover member 1 does not magnetically affect the drive mechanism using electromagnetic force.

As shown in FIG. 3, the cover member 1 has a bottomless box-like 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 flat plate-like 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. 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 light LT to reach the imaging element IS. Also, the cover member 1 is joined to the base plate 2 with an adhesive or the like to constitute the 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 member MB, a base plate 2 as a fixed member FM, a coil assembly 4, a coil holder 5, and a plate-like member 7.

The base plate 2 is a member forming part (bottom) of the housing HS. In this embodiment, the base plate 2 is made of a non-magnetic material such as austenitic stainless steel, like the cover member 1 .

The lens holder 3 is configured to hold the lens body LS. In this embodiment, the lens holder 3 is formed by injection molding synthetic resin such as liquid crystal polymer (LCP). The lens holder 3 also 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 driving magnet 6 is a member that constitutes the driving mechanism DM. In this embodiment, the driving magnets 6 are a first driving magnet 6A (see FIG. 4) attached to the first lens holder 3A and a second driving magnet 6B attached to the second lens holder 3B. (see FIG. 5).

In this embodiment, each of the first driving magnet 6A and the second driving magnet 6B is a permanent magnet magnetized to have two poles, and the inner side (the side closer to the optical axis JD) is magnetized to have an N pole. , the outside is magnetized to the S pole. Also, as shown in FIG. 4, the first driving magnet 6A is attached to the first lens holder 3A so that the outside (south 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 (south pole) is exposed. However, each of the first driving magnet 6A and the second driving magnet 6B may be magnetized with the south pole on the inner side (the side closer to the optical axis JD) and the north pole on the outer side.

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

The coil holder 5 is configured to movably support the movable member MB and immovably support the coil assembly 4 . In this embodiment, the coil holder 5 is formed by injection molding synthetic resin such as liquid crystal polymer (LCP). The coil holder 5 constitutes a base member BM together with the base plate 2 . 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 this embodiment, the coil assemblies 4 are 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. including 4B. A substrate 41 (see FIG. 7) of the coil assembly 4 is formed of a flexible printed circuit board, and is attached to the coil holder 5 via the plate member 7 as shown in FIGS. In addition, in the accompanying drawings, for the sake of clarity, with respect to the coil, the detailed winding state of the conductive wire coated with the insulating material is omitted.

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

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

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

The substrate 41 is a member formed with a conductive pattern for supplying electric power to the coil set 42, the magnetic sensor set 43, and the like. In this embodiment, the substrate 41 is formed of a flexible printed circuit board. The substrate 41 also includes a connection portion CP formed with a conductive pattern for supplying power to the electromagnetic mechanism EM (see FIG. 17) included in the lens holding assembly LH. Specifically, the connection portion CP is configured such that its upper surface (Z1 side surface) and the lower surface (Z2 side surface) of the lens holding assembly LH 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 that constitutes the drive mechanism DM and is attached to the substrate 41 . In this embodiment, the coil sets 42 are wire-wound coils, and are attached to the first substrate 41A of the first coil assembly 4A and the second substrate 41B of the second coil assembly 4B. and a second coil set 42B.

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 of current flow 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 of current flow can be controlled separately.

The magnetic sensor set 43 is an example of a magnetic detection member. In this embodiment, the magnetic sensor set 43 is a set of Hall elements, and is configured to detect 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. 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 arranged between the first coil 42A1 and the second coil 42A2. It is arranged inside the second coil 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 arranged inside the second coil 42B1. 42B2 inside.

The lens holding assembly LH is a member for holding the lens holder 3 at a movement limit position, which is an example of a 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 moves to the end of the movable range of the lens holder 3 . However, the lens holding assembly LH may hold the lens holder 3 near the movement limit position in the optical axis direction. In this embodiment, as shown in FIG. 14, the lens holding assembly LH includes a first lens holding assembly LH1 for holding the first lens holder 3A at the front (X1 side) movement limit position, and a second lens. It includes a second lens holding assembly LH2 for holding the holder 3B at 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 attached to the first coil assembly 4A. It is attached to the connecting part CP of the 1 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 held by a stopper portion (not shown) provided on the fixed side member FM such as the coil holder 5. abutting. The same applies when the second lens holder 3B is held at the movement limit position on the X2 side.

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

The movable-side member MB includes a lens holder 3 that holds the lens body LS and an engaging member 10, as shown in FIG. 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 at the movement limit position in the optical axis direction. In this embodiment, the engaging member 10 is made of a metal plate. As shown in FIG. 14, the first engaging member 10A is configured to engage with the first lens holding assembly LH1 when the first lens holder 3A is at 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 at the movement limit position on the X2 side.

The lens holder 3 is configured to be sandwiched between the cover member 1 and the coil holder 5, as shown in FIG. 11(A). 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. is configured as

The lower ball set 8 includes, as shown in FIG. 8, 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 forming the lower ball set 8 are made of metal. However, the eight balls forming the lower ball set 8 may be made of synthetic resin.

The upper ball set 9 includes, as shown in FIG. 8, 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 forming the upper ball set 9 are made of metal. However, the eight balls forming the upper ball set 9 may be made of synthetic resin.

The lens holder 3 includes a lens carrier 30, a spring set 31, and a push bar set 32, as shown in FIG. 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 this 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 concave portion RS6 on the side surface (side surface on the Y1 side) facing the first coil assembly 4A (see FIG. 4). A first driving magnet 6A is fitted into the recess RS6 and fixed with an adhesive.

Similarly, the second lens carrier 30B has a concave portion RS7 (not visible 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 into the recess RS7 and fixed with an adhesive.

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

The protrusion PR is configured to pass through an opening AP formed in the engaging member 10 . In this embodiment, the first lens carrier 30A is formed with two cylindrical projections PR. A recess for receiving the adhesive is formed around each of the two protrusions PR. The same applies to the second lens carrier 30B.

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

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

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

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, as shown in FIG.

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

The first spring set 31A includes four coil springs (first coil spring 31A1 to fourth coil spring 31A4). Similarly, the second spring set 31B includes four coil springs (first coil spring 31B1 to fourth coil spring 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 this embodiment, the coil spring is fitted in a hole HL (see FIGS. 9 and 10A) formed in the lens carrier 30, and is formed below the push bar set 32 (Z2 side). It is configured to receive a cylindrical protrusion AX (see FIG. 9).

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

Similarly, the holes HL formed in the second lens carrier 30B include first holes HL1 to fourth holes HL4. The first hole HL1 receives the first coil spring 31B1, the second hole HL2 receives the second coil spring 31B2, the third hole HL3 receives 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 receives 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 receives 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 receives 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 receives 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 protrusion AX1 is fitted inside the first coil spring 31A1, and the second protrusion AX2 is fitted inside the second coil spring 31A2. Also, the protrusion AX formed on the second push bar 32A2 attached to the first lens carrier 30A has a third protrusion AX3 and a fourth protrusion 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 protrusion AX1 is fitted inside the first coil spring 31B1, and the second protrusion AX2 is fitted inside the second coil spring 31B2. Also, the protrusion AX formed on the second push bar 32B2 attached to the second lens carrier 30B has a third protrusion AX3 and a fourth protrusion 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 (the surface on the Z2 side) of the first lens carrier 30A, there is a first ball 8A1 to a fourth ball 8A4 that constitute the first lower ball set 8A. A first recess RS1 to a fourth recess RS4 are formed. Similarly, on the lower surface (the surface on the Z2 side) of the second lens carrier 30B, there are provided first recesses RS1 to fourth recesses for respectively receiving the first balls 8B1 to the fourth balls 8B4 that constitute the second lower ball set 8B. RS4 is formed.

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

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

The first groove 5G1 receives the first ball 8A1 and the second ball 8A2 that constitute the first lower ball set 8A and the first ball 8B1 and the second ball 8B2 that constitute the second lower ball set 8B. is configured to

The second groove 5G2 receives the third ball 8A3 and fourth ball 8A4 that constitute the first lower ball set 8A and the third ball 8B3 and fourth ball 8B4 that constitute the second lower ball set 8B. is configured to

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

In addition, the first lens holder 3A urges the first push bar 32A1 upward by a first coil spring 31A1 (not visible in FIG. 11) and a second coil spring 31A2 that constitute the first spring set 31A. The second push bar 32A2 is urged upward by a third coil spring 31A3 (not visible in FIG. 11) and a fourth coil spring 31A4. Then, the first lens holder 3A places the first ball 9A1 (not visible in FIG. 11) and the second ball 9A2, which constitute the first upper ball set 9A supported by the first push bar 32A1, on the ceiling surface of the cover member 1. The third ball 9A3 (not visible in FIG. 11) and the fourth ball 9A4, which constitute the first upper ball set 9A supported by the second push bar 32A2, are configured to be pressed against the ceiling surface of the cover member 1. ing. In this embodiment, the ceiling surface of the cover member 1 does not have a structure such as the groove 5G that guides the movement of the upper ball set 9 . However, a structure such as the groove 5G may also 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 rattle and to move smoothly in the optical axis direction.

In the first groove 5G1, as shown in FIG. 11B, the slope SL2 on the outer side (the side farther from the optical axis JD) is inclined with respect to the horizontal plane with respect to the horizontal plane of the slope SL1 on the center side (the side closer to the optical axis JD). It is configured to be greater than the slope. The shape of the first groove G1 and the shape of the second groove G2 are symmetrical about the XZ plane including the optical axis JD.

This configuration can achieve centering of the first lens holder 3A. That is, with 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 can move not only in the optical axis direction (direction parallel to the X axis) but also in the optical axis direction. It is also possible to slightly move in a direction perpendicular to (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 aligned with 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 properly 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. FIG. 12 and 13 are top views of members constituting the drive mechanism DM. The driving mechanism DM is composed of the driving magnet 6 and the coil set 42 . 12 and 13, for the sake of clarity, illustration of members other than 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. It is Also, the coil set 42 is made transparent so that the position of the magnetic sensor set 43 can be seen. Further, the north poles of the driving magnet 6 and the holding magnet 12 are hatched with oblique lines.

Specifically, in FIG. 12A, the first lens holder 3A (first lens body LS1) and the second lens holder 3B (second lens body LS2) are both separated from the movement limit position, and both are It shows how they are separated from each other. Also, FIG. 12B shows the state when both the first lens holder 3A (first lens body LS1) and the second lens holder 3B (second lens body LS2) are at their movement limit positions. In FIG. 13A, the first lens holder 3A (first lens body LS1) is away from the movement limit position, the second lens holder 3B (second lens body LS2) is at the movement limit position, and both is in contact with the In FIG. 13B, the first lens holder 3A (first lens body LS1) is at the movement limit position, the second lens holder 3B (second lens body LS2) is away from the movement limit position, and both is in contact with the

The drive mechanism DM is configured to move the lens holder 3 in the optical axis direction. In this embodiment, the driving 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 magnetic force. In this embodiment, the holding magnets 12 are the first holding magnet 12A that magnetically holds the first lens holder 3A at the movement limit position, and the second lens holder 3B that is at the movement limit position. and a second holding magnet 12B.

In this embodiment, each of the first holding magnet 12A and the second holding magnet 12B is a permanent magnet magnetized to have two poles, and the inner side (the side closer to the optical axis JD) is magnetized to have an N pole. , the outside is magnetized to the S pole. As shown in FIG. 6, the holding magnet 12 is not directly opposed to the lens holder 3 (driving magnet 6). are attached to the coil holder 5 so as to face each other. However, each of the first holding magnet 12A and the second holding magnet 12B is magnetized to have an S pole on the inner side (the side closer to the optical axis JD) and an N pole on the outer side in accordance with the magnetic pole of the driving magnet 6. It may be magnetized.

The first holding magnet 12A consists of 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 includes a front magnet 12B1 that holds the second lens holder 3B at the movement limit position on the X1 side, and a rear magnet 12B1 that holds the second lens holder 3B at the movement limit position on the X2 side. 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 magnet 12A1 of the first holding magnet 12A moves toward the first drive magnet 6A attached to the first lens holder 3A at the movement limit position on the X1 side. is arranged to attract the first driving magnet 6A by an attractive force acting between the

The rear magnet 12A2 of the first holding magnet 12A is, as shown in FIG. It is arranged to attract the first driving magnet 6A by the attractive force acting therebetween.

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

The rear magnet 12B2 of the second holding magnet 12B is, as shown in FIG. It is arranged to attract the second driving magnet 6B by the attractive force acting therebetween.

Next, the relationship between the magnetic poles of the first driving magnet 6A and the magnetic poles of the first coil set 42A when moving the first lens holder 3A from 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 at the movement limit position on the X1 side, the first driving magnet 6A is at a position facing the first coil 42A1 of the first coil set 42A, as shown in FIG. 13(B). . However, the central axis M1 at the center position in the optical axis direction of the first driving 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 coincide, there is a possibility that the first driving magnet 6A cannot be moved away by a 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 driving 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 central axes L2, L3, L4, and M2, which will be described later.

When the first coil 42A1 is not energized, 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.

The first coil 42A1 is arranged so that the side (Y2 side) facing the first drive magnet 6A of the first coil 42A1 becomes 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 along the optical axis toward the X2 side, 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 becomes the N pole, that is, the first drive magnet 6A and the second coil 42A2 When the second coil 42A2 is excited so as to attract each other, the first driving magnet 6A moves further along the optical axis toward the X2 side, as shown in FIG. 13(A).

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

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

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

When the first coil 42B1 is not energized, 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.

The first coil 42B1 is arranged so that the side (Y1 side) facing the second driving magnet 6B of the first coil 42B1 becomes the S pole, that is, the second driving magnet 6B and the first coil 42B1 repel each other. When the coil 42B1 is excited, the second driving magnet 6B moves along the optical axis toward the X2 side, 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 driving magnet 6B becomes the N pole, that is, the second driving magnet 6B and the second coil 42B2 When the second coil 42B2 is excited so as to attract each other, the second driving magnet 6B moves further toward the X2 side along the optical axis direction, as shown in FIG. 13(A).

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

When the second lens holder 3B is at 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. , and the second driving magnet 6B (second lens holder 3B) is held at the movement limit position on the X2 side.

Next, sizes of the lens body LS, the driving magnet 6, and the coil set 42 will be described. In this 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 driving magnet 6A is larger than the width W6 of the second driving magnet 6B. In this embodiment, the height of the first driving magnet 6A is the same as the height of the second driving magnet 6B.

Further, the width W7 of each of the first coil 42A1 and the second coil 42A2 forming the first coil set 42A is equal to the width W8 of the first coil 42B1 and the second coil 42B2 forming the second coil set 42B. bigger than In this embodiment, as shown in FIG. 7, the height H1 of each of the first coil 42A1 and the second coil 42A2 that constitute the first coil set 42A is the same as that of 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 where coils can be arranged on the first substrate 41A of the first coil assembly 4A. In this embodiment, the first coil 42A1 is arranged at the right end (the end on the X1 side) of the arrangement area, and the second coil 42A2 is arranged at the left end (the 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 area. The same applies to the arrangement area of the second coil set 42B.

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

Next, a holding mechanism HM that mechanically holds the lens holder 3 at the movement limit position will be described with reference to FIGS. 14 to 18. FIG. FIG. 14 is a perspective view of the lower member LM, showing a state where 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 on the YZ plane including the dashed line CL2 in FIG. In FIG. 18, the upper holding magnet 22, the plunger 25, and the lower holding magnet 26 have their N poles hatched, so hatching indicating a cross section is omitted.

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

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

As shown in FIG. 15, the first lens holding assembly LH1 is configured such that the locking portion 25e can be advanced and retracted (moved vertically) 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. indicates Specifically, FIGS. 15A1 and 15A2 show how the engaging portion 25e is pushed upward, and FIGS. 15B1 and 15B2 show the engaging portion 25e is drawn downward.

In this embodiment, the first lens holding assembly LH1 is configured such that the engaging portion 25e can be moved up and down by an electromagnetic mechanism EM (see FIG. 17) provided therein. The same is true for the second lens holding assembly LH2.

The electromagnetic mechanism EM in the first lens holding assembly LH1 is located on the side (Y2 side) of the first lens holder 3A opposite to the side portion SB1 on which the first driving magnet 6A is provided (Y1 side). ) facing 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. 15(A2), the engaging portion 25e is configured such that its end face is located above the upper surface of the engaging member 10 when pushed upward. That is, the engaging portion 25e is configured to engage with the notch CT (see FIG. 8) formed in the engaging member 10 when pushed upward. Such a state is hereinafter referred to as an "engaged state". Further, as shown in FIG. 15(B2), the locking portion 25e is configured such that its end surface is positioned below the lower surface of the engaging member 10 when it is pulled downward. That is, the engaging portion 25e is configured so as not to mesh with the notch CT (see FIG. 8) formed in the engaging member 10 when pulled downward. Such a state is hereinafter referred to as a "disengaged state". Note that the notch CT is an example of an engaging portion, and may be formed as a through portion (opening (through hole)) that conforms to the shape of the locking portion 25e. Also, if the engaging portion and the locking portion 25e can engage with each other, that is, if they can selectively realize an engaged state and a non-engaged state, what kind of structure should they have? You may have

Further, as shown in FIG. 16, the first lens holding assembly LH1 is fixed by being fitted into the concave portion RS8 formed in the coil holder 5 while attached to the second substrate 41B of the second coil assembly 4B. be. Similarly, the second lens holding assembly LH2 is fitted into and fixed to the recess RS9 formed in the coil holder 5 while 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. 27, a lower cover 28, and the like.

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 , and the lower holding magnet 26 constitute an electromagnetic mechanism EM. The same is true for the second lens holding assembly LH2.

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

The yoke 21 is a member for efficiently acting magnetic fields generated by the upper holding magnet 22, the coil 24, and the lower holding magnet 26, respectively. In this embodiment, the yoke 21 is made of a magnetic material and cooperates with the upper cover 20 and the lower cover 28 to provide an upper holding magnet 22, a bobbin 23, a coil 24, a plunger 25, a lower holding magnet 26, and the coil spring 27 .

The upper holding magnet 22 is a member for magnetically maintaining the engagement state between the engaging portion 25 e of the plunger 25 and the engaging member 10 . Specifically, the upper holding magnet 22 is arranged so as to be able to pull the plunger 25 made of a magnetic material upward (in the Z1 direction). In this 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 have two poles, and as shown in FIG. ) is magnetized to the S pole. Also, the first magnet 22A is fitted into a recess RS10 formed in the bobbin 23 and fixed with an adhesive. Similarly, the second magnet 22B is fitted into a recess RS11 formed in the bobbin 23 and fixed with an adhesive.

Note that FIG. 18A shows a state in which the engaging portion 25e is pulled downward, and FIG. 18B shows a state in which the engaging portion 25e is pushed upward. 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. It 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 N 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 this embodiment, the bobbin 23 is formed by injection molding synthetic resin such as liquid crystal polymer (LCP).

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

The bobbin 23 is also configured to receive a plunger 25, a lower holding magnet 26, and a coil spring 27 within a cavity CV formed therein, as shown in FIG. The plunger 25 is arranged in the cavity CV so as to slide vertically (in the Z-axis direction) within the cavity CV. The coil spring 27 is arranged in a compressed state between the plunger 25 and the lower cover 28 so as to urge the plunger 25 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. As shown in FIG. Specifically, when the current flows in the first direction of the wire material forming the coil 24, the coil 24 turns the upper side (Z1 side) of the plunger 25 into the N pole as shown in FIG. 18(A). , and the lower side (Z2 side) of the plunger 25 is excited to the S pole. Conversely, when the current flows in the second direction (opposite direction to the first direction) of the wire constituting the coil 24, the coil 24 moves upward (Z1 side) of the plunger 25 as shown in FIG. 18(B). ) is excited to the S pole, and the portion on the lower side (Z2 side) of the plunger 25 is excited to the N pole.

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

The lower holding magnet 26 is a member for magnetically maintaining the disengaged state between the engaging portion 25e of the plunger 25 and the engaging member 10. As shown in FIG. Specifically, the lower holding magnet 26 is arranged so as to draw the plunger 25 made of a magnetic material downward (in the Z2 direction). In this 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 have two poles, and as shown in FIG. ) 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 forming the upper holding magnet 22 is attached to the N pole, the second magnet forming the lower holding magnet 26 Each of the first magnet 26A and the second magnet 26B is arranged such that the upper side (Z1 side) is the north pole.

Further, the first magnet 26A is fixed with an adhesive while being in contact with the stepped portion SP1 formed in the cavity CV of the bobbin 23. As shown in FIG. Similarly, the second magnet 26B is fixed with an adhesive while being in contact with the stepped portion SP2 formed in the cavity CV of the bobbin 23. As shown in FIG.

The coil spring 27 is an example of a biasing member, and is configured to bias the plunger 25 upward (Z1 direction) within the cavity CV of the bobbin 23 . In this embodiment, the coil spring 27 is arranged inside the cavity CV together with the plunger 25 . Specifically, one end of the coil spring 27 is in contact with the lower (Z2 side) end surface of the body portion 25m of the plunger 25, and the other end is in contact with the upper surface (Z1 side) of the lower cover 28 attached to the bobbin 23. surface) and is placed in a compressed state within the cavity CV.

The lower cover 28 is a substantially rectangular plate-like 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 configured to function as a yoke. Further, the lower cover 28 has six openings 28h through which the six projections 23q formed at the lower end of the bobbin 23 pass. In FIG. 17, only one of the six protrusions 23q is indicated by reference numerals, and only one of the six openings 28h is indicated by reference numerals. Also, one of the six openings 28h is formed as a notch that opens outward.

Further, in this 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 vertically moving the plunger 25 within the cavity CV of the bobbin 23 by electromagnetic force. In this 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 constituting the coil 24, the upper portion of the plunger 25 is magnetized to the N pole and the lower portion to the S pole, as shown in FIG. 18(A). be energized. 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 . It moves in the direction indicated by arrow AR3 due to the attraction force between it and the south pole of the part. At this time, the plunger 25 moves downward while compressing the coil spring 27 until the distance between the plunger 25 and the lower holding magnet 26 reaches the value GP1. The state in which the gap between the plunger 25 and the lower holding magnet 26 has reached the value GP1, that is, the state shown in FIG. is also maintained by the attractive force between the north pole of the lower holding magnet 26 and the plunger 25 which is not energized. 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 the current flows in the second direction of the wire constituting the coil 24, as shown in FIG. be energized. 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 , the N pole of the lower holding magnet 26 and the N pole of the lower portion of the plunger 25 . , and the restoring force of the coil spring 27, it moves in the direction indicated by the arrow AR4. At this time, the plunger 25 is moved 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 touches the stepped portion SP3 (see FIG. 18A) as a 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 vertically move the plunger 25 within the cavity CV of the bobbin 23 by a predetermined stroke amount (value SK).

The lock mechanism LK is a mechanism for mechanically fixing the movement of the plunger 25 in a state in which the engagement portion 25e of the plunger 25 and the notch CT (see FIG. 8) of the engagement member 10 are engaged with each other. In this 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 stepped portion SP3 formed in the cavity CV of the bobbin 23 are in contact, that is, the state shown in FIG. 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 supply of current to the coil 24 is stopped, the lock mechanism LK remains in the state shown in FIGS. Engagement with the CT can provide a condition in which the lens carrier 30 is held at its travel limit position.

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

For example, as shown in FIG. 13(A), the holding mechanism HM holds the second lens holder 3A and the second lens holder 3B when the first lens holder 3A and the second lens holder 3B are each at the rear side (X2 side) movement limit position. A notch CT of an engaging member attached to the Y1 side end of the first lens holder 3A located on the front side (X1 side) of 3B, and a second lens holder attached to the rear end of the first substrate 41A. Both the first lens holder 3A and the second lens holder 3B may be collectively held by engaging with the engaging portion 25e of the plunger 25 that constitutes the assembly LH2. 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 holds the first lens holder 3A and the second lens holder 3B when the first lens holder 3A and the second lens holder 3B are at their front (X1 side) movement limit positions. The notch CT of the engaging member attached to the Y2 side end of the second lens holder 3B located on the rear side (X2 side) of 3A, and the first lens holder attached to the front end of the second substrate 41B. Both the first lens holder 3A and the second lens holder 3B may be held together by meshing with the engaging portion 25e of the plunger 25 that constitutes the assembly LH1. In this case, the first engaging member 10A, the second engaging member 10B, and the second lens holding assembly LH2 may be omitted.

Thus, the holding mechanism HM may be configured to collectively hold both the first lens holder 3A and the second lens holder 3B with one engaging member and one lens holding assembly.

Next, referring to FIG. 19, control of the lens holder driving 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 driving device 101. As shown in FIG.

The control system SYS mainly controls the first Hall element 43A1, the second Hall element 43A2, and the third Hall element 43A3 in the first magnetic sensor set 43A, which are arranged in the lens holder driving device 101, and the second magnetic sensor. 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 a 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 driving device 101, as components.

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

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

The power source CS includes a first coil 42A1 and a second coil 42A2 in the first coil set 42A, a first coil 42B1 and a second coil 42B2 in the second coil set 42B, a coil 24 in the first lens holding assembly LH1, and a second It is configured such that current can be supplied 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 source CS using the PWM control method.

Specifically, when the control device CTR receives a camera activation signal from the input device ID, the control device CTR PWM-controls the power supply CS to control the coil 24 in the first lens holding assembly LH1 and the second lens holding assembly LH2. to supply current 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.

The coil 24 in the first lens holding assembly LH1 moves the plunger 25 downward (Z2 direction) as shown in FIG. That is, the coil 24 moves the end surface of the engaging portion 25e of the plunger 25, which is higher than the upper surface of the first engaging member 10A as shown in FIG. 15(A2), as shown in FIG. 15(B2). , 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 engaging portion 25e. This release allows the first lens holder 3A to move freely in the optical axis direction. The same applies to the release of the engagement between the second engaging member 10B and the locking portion 25e by the coil 24 in the second lens holding assembly LH2.

Thereafter, the controller CTR supplies 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 source CS.

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

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

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

When the first coil 42A1 receives a reverse current supply from the power supply CS, the magnetic force generated by the first coil 42A1 attracts the first driving magnet 6A, and the first driving magnet 6A is positioned at the position shown in FIG. 12(A). One 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 causes the second driving magnet 6B to move away, and the movement limit position on the X2 side shown in FIG. 12B is reached. The second lens body LS2 (second lens holder 3B) in the position shown in FIG. 12A can be moved.

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

Further, when the first coil 42B1 receives a reverse current supply from the power source CS, the magnetic force generated by the first coil 42B1 moves the second driving magnet 6B away, and the movement on the X1 side shown in FIG. 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 source CS, the magnetic force generated by the second coil 42B2 attracts the second driving magnet 6B, and the second coil 42B2 is positioned 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).

Note that the control device CTR determines the position of the first drive magnet 6A (first lens holder 3A) based on the 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 moving the first lens body LS1 (the first lens holder 3A) in the optical axis direction, the control device CTR controls the first coil based on the respective outputs of the first Hall element 43A1 to the third Hall element 43A3. The direction and magnitude of current supplied to each of the first coil 42A1 and the second coil 42A2 that constitute the set 42A can be feedback-controlled.

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

After that, when the control device CTR receives a camera stop signal from the input device ID, the control device CTR performs PWM control of the power supply CS to move the first lens body LS1 (first lens holder 3A) to the movement limit position on the X1 side. and move the second lens body LS2 (second lens holder 3B) 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 generated when the software button for stopping the camera function displayed on the touch panel display mounted on the camera-equipped mobile device is touch-operated. 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 controller CTR controls the coil in the first lens holding assembly LH1. 24 and the coil 24 in the second lens holding assembly LH2 are each supplied with current in the opposite direction to when the camera activation 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. Whether or not the second lens holder 3B (second driving magnet 6B) has reached the movement limit position on the X2 side can be determined based on the output of the 3-hole element 43B3.

The coil 24 in the first lens holding assembly LH1 moves the plunger 25 upward (Z1 direction) as shown in FIG. That is, the coil 24 moves the end surface of the engaging portion 25e of the plunger 25, which is lower than the lower surface of the first engaging member 10A as shown in FIG. 15(B2), as shown in FIG. 15(A2). , to a position higher than the upper surface of the first engaging member 10A. This is for engaging the first engaging member 10A and the engaging portion 25e. This engagement prohibits the first lens holder 3A from moving in the optical axis direction. The same applies to 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 driving device 101 according to one embodiment of the present invention includes the fixed side member FM, the lens holder 3 capable of holding the lens body LS, and the driving mechanism for moving the lens holder 3 in the optical axis direction. DM and a holding mechanism HM for holding the lens holder 3 at a movement limit position, which is a position on the end side of the movable range in the optical axis direction. The holding mechanism HM includes a plunger 25 as a movable body including an engaging portion 25e that is provided on the fixed side member FM and moves back and forth in a direction intersecting the optical axis direction, an electromagnetic mechanism EM that moves the plunger 25 back and forth, An engaging member 10 provided on a movable side member MB including the lens holder 3 and having a notch CT as an engaging portion with which the locking portion 25e can be engaged, and an end portion of movement of the lens holder 3 in the optical axis direction. and a lock mechanism LK that holds the plunger 25 in a state where the locking portion 25e and the notch CT are engaged at the movement limit position, which is the position.

In this configuration, the lens holder driving device 101 holds the lens holder 3 at the movement limit position by realizing engagement between the locking portion 25e of the plunger 25 and the notch CT of the engaging member 10, and this engagement is performed. By releasing the coupling, it is possible to move the lens holder 3 in the optical axis direction. Therefore, the lens holder driving device 101 can reliably hold the lens holder 3 at the movement limit position. Further, the lens holder driving device 101 can hold the lens holder 3 at the movement limit position without using the frictional force generated when a portion of the fixed side member and a portion of the movable side member are brought into frictional contact. . Therefore, this arrangement does not adversely affect the movement of the lens holder 3 when disengaged, nor does the force holding the lens holder 3 at its limit of travel change over time.

Plunger 25 may be configured to include a magnetic member. In this embodiment, the plunger 25 is made of a magnetic material. 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 to hold the plunger 25 at the locked position. may be The lock position means the position of the plunger 25 when the engaging portion 25e of the plunger 25 and the notch CT of the engaging member 10 are engaged with each other. A state in which the plunger 25 is in the locked position is referred to as a "locked state."

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

In addition, as shown in FIG. 18A, the lock mechanism LK has a lower holding magnet 26 as a second holding magnet that attracts a magnetic member to hold the plunger 25 at the unlocked position. good too. The unlocked position means the position of the plunger 25 when the engaging portion 25e of the plunger 25 and the notch CT of the engaging member 10 are disengaged. A state other than the locked state, including the state where the plunger 25 is in the unlocked position, is referred to as an "unlocked state."

With this configuration, the lens holder driving device 101 does not need to keep driving the electromagnetic mechanism EM to hold the plunger 25 in the unlocked position. That is, the lens holder driving device 101 can continue to hold the plunger 25 at the unlocked position even when the current supply to the coil 24 inside the lens holding assembly LH is stopped. Therefore, this configuration can suppress power consumption of the lens holder driving device 101 . However, the lens holder driving device 101 may maintain the unlocked state by continuing to supply current to the coil 24 inside 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 a plunger 25 as a magnetic member interposed therebetween. This configuration can suppress the enlargement of the lens holding assembly LH.

The plunger 25 as a moving 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. may have been This configuration can reduce the cost of the lens holding assembly LH.

The lock mechanism LK has a coil spring 27 that biases a plunger 25 as a moving body toward the lock position, and the plunger 25 compresses the coil spring 27 in the unlocked position as shown in FIG. may be configured to This configuration can reliably prevent contact between the plunger 25 and the lower holding magnet 26 . This configuration can also facilitate movement of plunger 25 from the unlocked position to the locked position. This is because the plunger 25 is always urged upward by the coil spring 27 in the unlocked position. In addition, this configuration can prevent the locked state from being erroneously released to the unlocked position when the camera-equipped portable device equipped with the lens holder driving device 101 receives an impact such as being dropped. . 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 that is greater than the attractive force with which the lower holding magnet 26 attracts the plunger 25 downward. It's for.

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

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

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

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

Further, as shown in FIG. 12A, the second drive mechanism DM2 includes a second drive magnet 6B ( 5), and a first coil 42B1 and a second coil 42B2 facing the second driving magnet 6B. In this case, the electromagnetic mechanism EM in the second lens holding assembly LH2 may be arranged to face the Y1 side 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 drive magnet 6 and the electromagnetic mechanism EM are configured so as not to approach each other excessively.

3 and 4, the lens holder driving device 101 according to one embodiment of the present invention includes a fixed side member FM, a first lens holder 3A capable of holding the first lens body LS1, and , a movable side member MB including a second lens holder 3B capable of holding a second lens body LS2 arranged to have the same optical axis JD as the first lens body LS1, and the first lens holder 3A in the optical axis direction. A first driving mechanism DM1 for moving and a second driving mechanism DM2 for moving the second lens holder 3B in the optical axis direction are provided.

The fixed-side member FM includes a first coil assembly 4A (first substrate 41A) as a first surface and a second surface provided so as to face each other with the first lens holder 3A and the second lens holder 3B interposed therebetween. and a second coil assembly 4B (second substrate 41B). 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. Also, as shown in FIG. 4, the first driving 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 driving magnet 6B facing the second coil assembly 4B (second coil set 42B) is fixed to the second lens holder 3B. The first driving magnet 6A and the first coil set 42A constitute a first driving mechanism DM1, and the second driving magnet 6B and the second coil set 42B constitute a second driving mechanism DM2.

This configuration, in which the first lens holder 3A and the second lens holder 3B can be separately moved, can promote miniaturization of the lens holder drive device 101 compared to a configuration provided with two rotary electric motors. Moreover, this configuration can suppress magnetic interference between the first drive mechanism DM1 and the second drive mechanism DM2. This is because the first driving mechanism DM1 and the second driving mechanism DM2 are arranged so as to sandwich the first lens holder 3A and the second lens holder 3B. That is, this is because the first drive mechanism DM1 and the second drive mechanism DM2 are arranged with a sufficient space therebetween.

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 a first coil 42A1 and a second coil 42A2, and the second coil set 42B includes a first coil 42B1 and a second coil 42B2. As shown in FIG. 13A, the width W5, which is the dimension of the first driving 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 positioned at the end on the X1 side, which is one end of the movable range of the movable side member MB, the first drive The central axis M1, which is the central position of the magnet 6A in the optical axis direction, is located away from the central axis L1, which is the central position of the first coil 42A1 constituting the first coil set 42A in the optical axis direction. That is, the central axis M1 of the first driving 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 driving 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 positioned 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 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 in the optical axis direction of the second coil 42B2 that constitutes the second coil set 42B. That is, the central axis M2 of the second driving magnet 6B and the central axis L4 of the second coil 42B2 do not match.

With this configuration, the lens holder driving device 101, for example, as shown in FIG. When the current is supplied to 42A1, the first lens holder 3A can be reliably moved backward (X2 direction). When the central axis L1 of the first driving magnet 6A and the central axis M1 of the first coil 42A1 are aligned, the repulsive force that moves the first driving magnet 6A forward (X1 direction), Although there is a risk that the repulsive force that tries to move the first driving magnet 6A backward (in the X2 direction) may be balanced, this configuration is specifically designed so that the central axis L1 and the central axis M1 do not coincide. , the central axis L1 is located forward of the central axis M1, so the force to move the first driving magnet 6A forward and the force to move it rearward are balanced. can be prevented.

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 driving magnet 6A in the optical axis direction, is larger than the width W6, which is the dimension of the second driving magnet 6B in the optical axis direction. In the example shown in FIG. 13, the height of the first driving magnet 6A is the same as the height of the second driving magnet 6B.

With this configuration, even if the first lens holder 3A is larger than the second lens holder 3B, the first drive mechanism DM1 can move the first lens holder 3A because the first drive magnet 6A is larger than the second drive magnet 6B. sufficient thrust to move the

Further, as shown in FIG. 13A, the width W7, which is the dimension of each of the first coil 42A1 and the second coil 42A2 that constitute the first coil set 42A in the optical axis direction, is the width of the second coil in the optical axis direction. It is larger than the width W8, which is the dimension of each of the first coil 42B1 and the second coil 42B2 that constitute 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 forming the first coil set 42A is equal to the height H1 of the first coil 42B1 forming the second coil set 42B. and the height H2 of the second coil 42B2.

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 respectively the first coil 42B1 and the second coil 42B2. , it is possible to generate sufficient thrust to move the first lens holder 3A.

Basically, the larger the width of the driving magnet 6, the larger the distance between two adjacent coils in the optical axis direction. number of coils can be reduced. Reducing the number of coils leads to reduction in power consumption of the lens holder driving device 101 .

On the other hand, when the number of coils required to achieve the desired amount of movement of the lens holder 3 increases, the size of each coil is reduced to reduce the power consumption of each coil. 101 power consumption 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 forming the first coil set 42A and the second coil 42B2 forming the second coil set 42B is partially overlapped with

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

With this configuration, the lens holder driving 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 (the first coil 42A1 and the second coil 42A2), and the second coil assembly as the second surface. 4B is also provided with a plurality of coils (first coil 42B1 and second coil 42B2).

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

Further, as shown in FIG. 13B, when the first lens holder 3A (first lens body LS1) is positioned 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 in the coil holder 5 (see FIG. 6) as the stationary member FM.

Further, as shown in FIG. 13A, when the second lens holder 3B (second lens body LS2) is positioned 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 The second holding magnet 12B (rear side magnet 12B2) that attracts the magnet 6B may be provided in the coil holder 5 (see FIG. 6) as the fixed side member FM.

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

As shown in FIGS. 4 and 5, the lens holder driving device 101 may have two grooves 5G (a first groove 5G1 and a second groove 5G2) that guide the movement of the movable side member MB in the optical axis direction. good. Note that the lens holder driving device 101 may include one or more grooves instead of the two grooves 5G, may include one or more guide rails, and may include one or more guide rails. It may have a shaft.

With this configuration, the lens holder driving 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 balls on the upper and lower sides, and the ball held on the upper side of the movable-side member MB may be biased 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 that constitutes the movable member MB holds the lower ball set 8 on the lower side and the upper ball set on the upper side. It may be configured to hold a 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 driving device 101 can suppress frictional resistance when the lens holder 3 is moved.

The preferred embodiments of the present invention have been described in detail above. However, the invention is not limited to the embodiments described above. Various modifications and replacements may be applied to the above-described embodiments without departing from the scope of the present invention. Also, each of the features described with reference to the above-described embodiments may be combined as appropriate as long as they are not technically inconsistent.

For example, in the above-described embodiment, the first lens holding assembly LH1 advances and retracts the locking portion 25e in a direction parallel to the Z-axis, which is one of the directions orthogonal to the optical axis direction, as shown in FIG. is configured to However, the first lens holding assembly LH1 may be configured to advance and retract the locking portion 25e in the 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 parallel to the Y-axis. Alternatively, the first lens holding assembly LH1 is configured to move the locking portion 25e back and forth 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. may have been In this case, the engaging portion of the first engaging member 10A is formed to appropriately mesh with the locking portion 25e. The same is true for the second lens holding assembly LH2.

In the above-described embodiment, the first coil 42A1 and the second coil 42A2 that constitute the first coil set 42A have coil axes that are winding centers parallel to the Y-axis. It may be a coil having a coil axis parallel to JD. The same applies to the second coil set 42B.

DESCRIPTION OF SYMBOLS 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... Upper surface portion 2... Base plate 3... Lens holder 3A... First lens holder 3B... Second lens holder 4... Coil assembly 4A... First coil assembly 4B... Second coil assembly 5 Coil holder 5G Groove 5G1 First groove 5G2 Second groove 6 Driving magnet 6A First driving magnet 6B Second driving magnet 7 Plate member 7A First plate member 7B Second plate member 8 Lower ball set 8A First 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... Third ball 8B4... Fourth ball 9... Upper side ball set 9A... First upper side ball set 9A1... First ball 9A2... Second ball 9A3... Third ball Ball 9A4 Fourth ball 9B Second upper ball set 9B1 First ball 9B2 Second ball 9B3 Third ball 9B4 Fourth ball 10 Engaging Joining member 10A First engaging member 10B Second engaging member 12 Holding magnet 12A First holding magnet 12A1 Front magnet 12A2 Rear magnet 12B Second holding magnet 12B1 Front magnet 12B2 Rear magnet 20 Upper cover 20h, 20k Opening 21 Yoke 22 Upper holding magnet 22A First magnet 22B Second magnet 23 Bobbin 23n Constriction 23p, 23q Convex portion 24 Coil 25 Plunger 25e Locking portion 25m Main body 25sShoulder 26Lower holding magnet 26AFirst magnet 26BSecond magnet 27Coil spring 28Lower cover 28hOpening 30 Lens carrier 30A First lens carrier 30B Second lens carrier 31 Spring set 31A First spring set 31A1 First coil spring 31A2 Second coil spring 31A3 Third coil spring 31A4 Fourth coil spring 31B Second spring set 31B1 First coil spring 31B2 Second coil spring 31B3 Third coil spring 31B4 Fourth coil spring 32 Push bar set 32A First push bar set 32A1 First push bar 32A2 Second push bar 32B Second push bar set 32B1 First push bar 32B2 Second 2 Push bar 41 Board 41A First board 41B Second board 42 Coil set 42A First coil set 42A1 First coil 42A2 Second coil 42B... Second coil set 42B1... First coil 42B2... Second coil 43... Magnetic sensor set 43A... First magnetic sensor set 43A1... First Hall element 43A2... Second Hall element 43A3 Third Hall element 43B Second magnetic sensor set 43B1 First Hall element 43B2 Second Hall element 43B3 Third Hall element 101 Lens Holder driving device AP... Opening AX... Protruding part AX1... First protruding part AX2... Second protruding part AX3... Third protruding part AX4... Fourth protruding part BL... Projection BM... Base member CM... Camera module CP... Connecting part CS... Power supply CT... Notch CTR... Control unit CU... Notch CV... Cavity DM・Drive Mechanism DM1 First Drive Mechanism DM2 Second Drive Mechanism EM Electromagnetic Mechanism FM Fixed Side Member HL Hole HL1 First Hole HL2 Second 2 holes HL3... 3rd hole HL4... 4th hole HM... Holding mechanism HS... Housing ID... Input device IS... Imaging element JD... Optical axis LH... Lens holding assembly LH1 First lens holding assembly LH2 Second lens holding assembly LK Lock mechanism LM Lower member LS Lens body LS1 First lens body LS2 Second lens body LT Light MB Movable member MR Mirror PR Convex part RS1 to RS11 Concave part SL1, SL2 Slope SP1 to SP3 Step Part SYS: Control system

Claims (9)

a fixed side member;
a lens holder capable of holding a lens body;
a driving mechanism for moving the lens holder in the optical axis direction;
A lens holder driving device comprising: a holding mechanism for holding the lens holder at a position on the end side of the movable range in the optical axis direction,
The holding mechanism is
a movable body provided on the fixed side member and including a locking portion that advances and retreats in a direction intersecting the optical axis direction; and an electromagnetic mechanism that advances and retreats the movable body;
an engaging member provided on the movable side member including the lens holder and having an engaging portion with which the locking portion can be engaged;
a locking mechanism that holds the moving body in a state where the locking portion and the engaging portion are engaged at a position on the end side of the movable range of the lens holder in the optical axis direction,
A lens holder driving device characterized by: the moving body includes a magnetic member,
The locking mechanism has a first holding magnet that attracts the magnetic member to hold the movable body at the locked position,
The lens holder driving device according to claim 1. The locking mechanism has a second holding magnet that attracts the magnetic member to hold the movable body in the unlocked position,
The lens holder driving device according to claim 2. The first holding magnet and the second holding magnet are arranged to face each other with the magnetic member interposed therebetween.
The lens holder driving device according to claim 3. the moving body is an iron core,
The electromagnetic mechanism includes the iron core, a bobbin arranged on the outer circumference side of the iron core, and a coil held on the outer circumference of the bobbin.
The lens holder driving device according to any one of claims 2 to 4. The lock mechanism has a coil spring that biases the moving body toward the lock position,
in the unlocked position of the mover, the mover compresses the coil spring;
The lens holder driving device according to any one of claims 2 to 5. The bobbin has a stopper portion that contacts the iron core at the lock position of the moving body,
The lens holder driving device according to claim 5. A yoke constituting the electromagnetic mechanism is arranged outside the coil,
The lens holder driving device according to claim 5 or 7. The drive mechanism has a drive magnet provided on one side of the lens holder and a drive coil facing the drive magnet,
The electromagnetic mechanism is arranged to face the other side of the lens holder,
The lens holder driving device according to any one of claims 1 to 8.

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