JP2023114905A - Optical element driving device - Google Patents

Abstract

To provide an optical element driving device capable of suppressing occurrence of a foreign matter.SOLUTION: An optical element driving device 100 comprises: a base member 18; an optical element holding member 2; three balls 11 arranged between the base member 18 and the optical element holding member 2; magnetic attraction means MA that generates force for attracting the optical element holding member 2 and the base member 18 each other; and driving means DM that moves the optical element holding member 2 to the base member 18 in a Y-axis direction. The magnetic attraction means MA includes a magnet 8 for attraction fixed to the optical element holding member 2, and a magnetic member 13 provided on the base member 18. Another magnetic member 17 provided on the base member 18 is arranged apart from the magnet 8 for attraction in the Y-axis direction so that repulsive force acts between the magnet 8 for attraction and the magnetic member 17. A protrusion 18W is provided in contact with the optical element holding member 2 moved in the Y-axis direction on the base member 18.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to an optical element driving device.

2. Description of the Related Art Conventionally, there is known a driving device that uses a magnet and a coil to move an optical element such as a lens attached to a driving frame with respect to a fixed portion (see Patent Document 1). This drive device is configured to move the drive frame along the optical axis direction with a magnet and a coil. This drive device has a coil spring that presses the drive frame against the fixed portion along the optical axis direction in an initial state in which no current is supplied to the coil. The coil spring can prevent the drive frame from moving undesirably in the initial state.

Japanese Patent Application Laid-Open No. 2020-043703

However, in this drive device, there is a possibility that foreign matter such as abrasion powder may be generated due to repeated contact between the coil spring and other members.

Therefore, it is desirable to provide an optical element driving device capable of suppressing the generation of foreign matter.

An optical element driving device according to an embodiment of the present invention includes a stationary member including a support member, an optical element holding member having a through hole penetrating in the vertical direction in which an optical element can be arranged, and the support member in the vertical direction. At least three balls arranged between the optical element holding member and magnetic attraction means for generating a force to mutually attract the optical element holding member and the support member arranged with the balls interposed therebetween in the vertical direction. and driving means for moving the optical element holding member relative to the supporting member in a first direction orthogonal to the vertical direction, wherein the magnetic attraction means includes an attracting magnet fixed to the optical element holding member. and a magnetic member provided on the support member so that an attractive force acts between the magnet for attraction and the magnetic member, wherein the fixed member has another magnetic member, and the Another magnetic member is arranged apart from the attraction magnet in the first direction so that a magnetic force acts between the attraction magnet and the another magnetic member, and the stationary member includes: A restricting portion is provided that abuts on the optical element holding member that moves in the first direction.

The optical element driving device described above can suppress the generation of foreign matter.

1 is a perspective view of an example of an optical element driving device; FIG. FIG. 2 is an exploded perspective view of the optical element driving device of FIG. 1; 2 is an exploded perspective view of a lower member that constitutes the optical element driving device of FIG. 1. FIG. 2 is a bottom view of an optical element holding member that constitutes the optical element driving device of FIG. 1; FIG. FIG. 2 is an exploded perspective view of a fixed-side member that constitutes the optical element driving device of FIG. 1; 2 is a trihedral view of a magnetic system that constitutes the optical element driving device of FIG. 1. FIG. Fig. 2 is a cross-sectional view of the ball containing structure; 2 is a top view of a driving magnet, an attracting magnet, a ball, and a magnetic member that constitute the optical element driving device of FIG. 1; FIG. FIG. 10 is a perspective view of another example of the optical element driving device; FIG. 10 is an exploded perspective view of the optical element driving device of FIG. 9; FIG. 10 is an exploded perspective view of a lower member that constitutes the optical element driving device of FIG. 9; FIG. 10 is a bottom view of an optical element holding member that constitutes the optical element driving device of FIG. 9; FIG. 10 is an exploded perspective view of a fixed-side member that constitutes the optical element driving device of FIG. 9; FIG. 10 is a trihedral view of a magnetic system that constitutes the optical element driving device of FIG. 9; FIG. 10 is a top view of a driving magnet, an attracting magnet, a ball, and a magnetic member that constitute the optical element driving device of FIG. 9;

An optical element driving device 100 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 optical element driving device 100. FIG. FIG. 2 is an exploded perspective view of the optical element driving device 100 composed of the case 4 and the lower member LB, showing a state where the case 4 is separated from the lower member LB. FIG. 3 is an exploded perspective view of the lower member LB, showing a state where the movable member MB is separated from the fixed member FB. FIG. 4 is a bottom view of the optical element holding member 2 constituting the optical element driving device 100. FIG. FIG. 5 is an exploded perspective view of the fixed member FB.

1 to 5, 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 FIG. 1, the X1 side of the optical element driving device 100 corresponds to the front side (front side) of the optical element driving device 100, and the X2 side of the optical element driving device 100 corresponds to the rear side (back side) of the optical element driving device 100. ). Further, the Y1 side of the optical element driving device 100 corresponds to the left side of the optical element driving device 100 , and the Y2 side of the optical element driving device 100 corresponds to the right side of the optical element driving device 100 . The Z1 side of the optical element driving device 100 corresponds to the upper side of the optical element driving device 100, and the Z2 side of the optical element driving device 100 corresponds to the lower side of the optical element driving device 100. FIG. The same applies to other members in other drawings.

The optical element driving device 100 is a device for moving an optical element OE as shown in FIG. 2 on a virtual plane parallel to the XY plane. In FIG. 2, for clarity, the optical element OE is shown to have a substantially rectangular parallelepiped shape, but it may have other shapes such as a cylindrical shape. In the drawings other than FIG. 2, illustration of the optical element OE is omitted for clarity. The optical element OE is a lens body, mirror, prism, diffraction grating, light emitting element, light receiving element, imaging element, optical filter, or the like. The lens body is a cylindrical lens barrel with at least one lens. In this embodiment, the optical element OE is a lens body. Therefore, hereinafter, the upper side of the optical element driving device 100 may be referred to as the "subject side", and the lower side of the optical element driving device 100 may be referred to as the "imaging device side".

As shown in FIGS. 1 and 2, the optical element driving device 100 includes a case 4 and a lower member LB which are part of the fixed member FB.

The case 4 is a cover member that covers the lower member LB. In this embodiment, the case 4 is produced by punching, drawing, and the like, on a plate material formed of non-magnetic metal such as austenitic stainless steel. Since the case 4 is made of non-magnetic metal, the case 4 does not magnetically affect the driving means DM (described later) that uses electromagnetic force.

As shown in FIG. 2, the case 4 has a lidded rectangular cylindrical outer shape that defines a storage portion 4S. Specifically, the case 4 includes a substantially rectangular cylindrical outer wall portion 4A, and a substantially rectangular annular flat plate-shaped top plate portion provided so as to be continuous with the upper end (the end on the Z1 side) of the outer peripheral wall portion 4A. 4B and. A substantially rectangular through hole 4K is formed in the center of the top plate portion 4B. The outer peripheral wall portion 4A includes a first side plate portion 4A1 to a fourth side plate portion 4A4. The first side plate portion 4A1 and the third side plate portion 4A3 face each other, and the second side plate portion 4A2 and the fourth side plate portion 4A4 face each other. The second side plate portion 4A2 and the fourth side plate portion 4A4 extend perpendicularly to the first side plate portion 4A1 and the third side plate portion 4A3. Further, as shown in FIG. 1, the case 4 is joined to the base member 18 with an adhesive to form a housing HS together with the base member 18. As shown in FIG.

As shown in FIG. 3, the lower member LB includes a coil 9, a magnetic sensor 10, a magnetic member 13, a nonmagnetic member 14, an insulating substrate 15, a magnetic member 17, and a base member 18, which are part of the fixed member FB. , a ball 11, and a movable member MB.

The ball 11 is configured to support the movable member MB movably in the direction parallel to the Y-axis with respect to the fixed member FB. In this embodiment, the balls 11 are spherical rolling elements made of a hard material such as resin, ceramic, or metal, and include first balls 11A to third balls 11C. The ball 11 is arranged between a concave portion 18S as an upward concave portion formed in the base member 18 and a concave portion 2S as a downward concave portion formed in the optical element holding member 2 (see the upper diagram of FIG. 4). . Specifically, the first ball 11A is arranged between the first recess 18S1 and the first recess 2S1 (see the upper diagram of FIG. 4). Also, the second ball 11B is arranged between the second recess 18S2 and the second recess 2S2 (see the upper diagram of FIG. 4). Also, the third ball 11C is arranged between the third recess 18S3 and the third recess 2S3 (see the upper diagram of FIG. 4). With this configuration, the movable member MB is supported by the balls 11 so as to be movable in the direction parallel to the Y-axis with respect to the fixed member FB.

The coil 9 is one of the members constituting the driving means DM, and is fixed to the base member 18 so as to face the driving magnet 5, which is another member constituting the driving means DM, with a gap therebetween in the vertical direction. ing. In the example shown in FIG. 3, the coil 9 is a wound type coil. However, the coil 9 may be of a laminated type or of a film type. Also, the coil 9 may be composed of a combination of a plurality of coils.

The magnetic member 13 is one of the members constituting the magnetic attraction means MA (described later), and is separated vertically from the driving magnet 5 and the attraction magnet 8, which are separate members constituting the magnetic attraction means MA. , and are fixed to the base member 18 so as to be magnetically attracted to each of the driving magnet 5 and the attracting magnet 8 . In the illustrated example, the magnetic member 13 includes a first magnetic member 13A, a second magnetic member 13B, and a third magnetic member 13C that are adhesively fixed to the upper surface of the base member 18 . The magnetic member 13 is a plate-like member made of iron or magnetic stainless steel, for example.

The non-magnetic member 14 is one of the members constituting the damping means AM (described later), and faces the attracting magnets 8, which are separate members constituting the damping means AM, with a space therebetween in the vertical direction. Also, it is fixed to the base member 18 so as to function as an eddy current induction plate that generates an eddy current when each of the attraction magnets 8 moves. Typically, the non-magnetic member 14 is made of metal having a higher conductivity than the magnetic member 13 and is provided above the magnetic member 13 . In the illustrated example, the non-magnetic member 14 is a plate-like member made of aluminum, which is a non-magnetic metal. It includes a second non-magnetic member 14B adhesively fixed to the upper surface of the magnetic member 13B. The non-magnetic member 14 may be made of other non-magnetic metal such as copper, or may be made of a non-magnetic conductor other than metal.

In the illustrated example, the first magnetic member 13A and the first non-magnetic member 14A have the same shape and size in plan view. Also, the second magnetic member 13B and the second non-magnetic member 14B have the same shape and size in plan view. Also, the first magnetic member 13A and the second magnetic member 13B have the same shape and size in plan view. The thickness of the first magnetic member 13A is smaller than the thickness of the first non-magnetic member 14A, and the thickness of the second magnetic member 13B is smaller than the thickness of the second non-magnetic member 14B.

The magnetic member 17 is one of the members constituting the biasing means BM (described later), and faces the attracting magnets 8, which are separate members constituting the biasing means BM, with a gap in the Y-axis direction. and exert magnetic forces on each of the attracting magnets 8 . In the illustrated example, the magnetic member 17 is a rectangular parallelepiped permanent magnet magnetized to two poles, the inner side (Y1 side) is magnetized to the S pole, and the outer side (Y2 side) is magnetized to the N pole. there is FIG. 3 shows the portion magnetized to the N pole by a dot pattern. The same applies to the driving magnet 5 and the attracting magnet 8 . Specifically, the magnetic member 17 includes a first magnetic member 17A and a second magnetic member 17B that are adhesively fixed to the upper surface of the base member 18 . The attracting magnet 8 and the magnetic member 17 are arranged such that the respective south pole portions of the attracting magnet 8 and the respective south pole portions of the magnetic member 17 face each other.

The driving means DM includes a coil 9 provided on the base member 18 and a driving magnet 5 spaced apart so as to face the coil 9 in the Z-axis direction.

Optical element driving device 100 having a substantially rectangular parallelepiped shape is mounted on, for example, a main substrate (not shown). The coil 9 is connected to a current supply source through the insulating substrate 15 and the main substrate. When the coil 9 is energized, the drive means DM generates an electromagnetic force along a direction parallel to the Y-axis.

For example, when the optical element OE is a lens body, the optical element driving device 100 uses the electromagnetic force along the direction parallel to the Y-axis by the driving means DM to move the optical element OE along the direction parallel to the Y-axis. A shift function (camera shake correction function) can be realized by moving the lens body as .

The movable side member MB includes an optical element holding member 2, a driving magnet 5, and an attracting magnet 8, as shown in FIG.

In this embodiment, the driving magnet 5 is a rectangular parallelepiped permanent magnet magnetized to two poles, the inner side (Y2 side) is magnetized to the S pole, and the outer side (Y1 side) is magnetized to the N pole. It is The driving magnet 5 is arranged apart from the coil 9 so as to face the coil 9 in the Z-axis direction. Specifically, the driving magnet 5 is arranged so that the inner portion faces the inner linear portion of the coil 9 and the outer portion faces the outer linear portion of the coil 9 . The drive magnet 5 may be magnetized with an N pole on the inner side (Y2 side) and magnetized with an S pole on the outer side (Y1 side). Alternatively, the driving magnet 5 may be composed of a combination of multiple permanent magnets.

The drive magnet 5 also functions as a detection magnet for detecting displacement of the optical element OE. Specifically, the drive magnet 5 functions as a detection magnet for detecting displacement of the optical element OE in the Y-axis direction. Therefore, the driving magnet 5 is arranged apart from the magnetic sensor 10 so as to face the magnetic sensor 10 in the Z-axis direction.

The attracting magnet 8 is one of the members constituting the magnetic attracting means MA. In the illustrated example, the attracting magnet 8 faces the magnetic member 13 with the non-magnetic member 14 interposed therebetween in the vertical direction so that a magnetic attraction force acts between the attracting magnet 8 and the magnetic member 13. It is fixed to the optical element holding member 2 as shown. Specifically, the attracting magnet 8 is composed of a first attracting magnet 8A arranged away from the first magnetic member 13A so as to face the first magnetic member 13A in the vertical direction, and a second magnetic member 8A in the vertical direction. and a second attracting magnet 8B that is spaced apart from the second magnetic member 13B so as to face the member 13B.

The optical element holding member 2 is configured to hold the optical element OE, the driving magnet 5 and the attracting magnet 8 . In this embodiment, the optical element holding member 2 is formed by injection molding synthetic resin such as liquid crystal polymer (LCP). Further, the optical element holding member 2 includes a through hole 2K formed so as to extend parallel to the Z axis, as shown in FIG. The optical element OE is fixed with an adhesive to the inner peripheral surface of the through hole 2K.

FIG. 4 is a bottom view of the optical element holding member 2. FIG. Specifically, the upper diagram of FIG. 4 is a bottom view of the optical element holding member 2 when the driving magnet 5, the attracting magnet 8, and the balls 11 are not arranged, and the lower diagram of FIG. 4 is a driving diagram. 2 is a bottom view of the optical element holding member 2 when the magnet 5 for attraction, the magnet 8 for attraction, and the ball 11 are arranged. FIG.

Specifically, the optical element holding member 2 is a substantially rectangular annular frame. The four side portions 2E forming the frame include a first side portion 2E1 to a fourth side portion 2E4. Further, the third side portion 2E3 is provided with a projecting portion 2F projecting rightward (Y2 direction).

A recess 2P recessed in the Z1 direction is provided on the end surface of the optical element holding member 2 on the lower side (Z2 side) on the imaging element side, as shown in the upper diagram of FIG. As shown in the lower diagram of FIG. 4, the recess 2P accommodates an attracting magnet 8. As shown in FIG. In the illustrated example, the attracting magnet 8 is fixed to the optical element holding member 2 with an adhesive. Specifically, the recessed portion 2P includes a first recessed portion 2P1 in which the first attracting magnet 8A is accommodated, and a second recessed portion 2P2 in which the second attracting magnet 8B is accommodated. The first concave portion 2P1 is provided at a fourth corner portion 2C4, which is one of the four corner portions 2C of the optical element holding member 2, and the second concave portion 2P2 is provided at the four corner portions 2C of the optical element holding member 2. It is provided at the third corner 2C3, which is another one of them.

In addition, as shown in the upper diagram of FIG. 4, a recess 2R recessed in the Z1 direction is provided on the end face on the lower side (Z2 side) of the first side portion 2E1. The drive magnet 5 is housed in the recess 2R as shown in the lower diagram of FIG. In the illustrated example, the driving magnet 5 is fixed to the optical element holding member 2 with an adhesive. The recessed portion 2R opens not only on the lower side but also on the lateral side (the left side (Y1 side), which is the radially outer side in the illustrated example). However, the recessed portion 2R may be configured so as not to open to the side (diametrically outward).

In addition, as shown in the upper diagram of FIG. 4, a recess 2S as a downward recess recessed in the Z1 direction is provided on the end surface of the lower side (Z2 side) of the optical element holding member 2. As shown in FIG. The concave portion 2S accommodates the upper portion of the ball 11, as shown in the lower diagram of FIG. In the illustrated example, the concave portion 2S includes a first concave portion 2S1 that accommodates the upper portion of the first ball 11A, a second concave portion 2S2 that accommodates the upper portion of the second ball 11B, and an upper portion of the third ball 11C. and a third recess 2S3 to be accommodated. The first concave portion 2S1 is provided on the lower (Z2 side) end surface of the third side portion 2E3, and the second concave portion 2S2 is provided on the lower (Z2 side) end surface of the second side portion 2E2. The recessed portion 2S3 is provided on the end face on the lower side (Z2 side) of the fourth side portion 2E4. Specifically, the first concave portion 2S1 is provided on the lower (Z2 side) end surface of the projecting portion 2F projecting rightward from the right side surface of the optical element holding member 2. As shown in FIG.

The lower portions of the first ball 11A to the third ball 11C are accommodated in recesses 18S (see FIG. 3) formed in the upper surface of the base member 18 as upward recesses. Also, at least one of the recess 2P and the recess 2R may be a through hole penetrating through the optical element holding member 2 in the vertical direction.

The base member 18 is formed by injection molding using synthetic resin such as liquid crystal polymer. In this embodiment, as shown in FIG. 5, the base member 18 has a substantially rectangular outline in plan view and has a through hole 18K in the center. The insulating substrate 15 on which the coil 9 and the magnetic sensor 10 are mounted, the magnetic member 13, and the non-magnetic member 14 are fixed with an adhesive to the upper surface of the base member 18, which is the object-side surface (Z1-side surface). . The through-hole 18K corresponds to the through-hole 2K of the optical element holding member 2. As shown in FIG. Further, a concave portion 18U for accommodating the magnetic member 13 is formed on the upper surface of the base member 18. As shown in FIG. The recess 18U includes a first recess 18U1 that houses the first magnetic member 13A, a second recess 18U2 that houses the second magnetic member 13B, and a third recess 18U3 that houses the third magnetic member 13C. Further, a convex portion 18P to which the coil 9 is fixed is formed on the upper surface of the base member 18. As shown in FIG. The convex portion 18</b>P protrudes upward so as to enter the coil hole of the coil 9 .

As shown in FIG. 3, the left side surface of the optical element holding member 2 is provided with a contact portion 2T projecting leftward, and the upper surface of the base member 18 is provided with a projecting portion 18W projecting upward. there is The projecting portion 18W functions as a restricting portion that restricts movement of the optical element holding member 2 relative to the base member 18 in the Y-axis direction. That is, the contact portion 2T of the optical element holding member 2 and the projecting portion 18W of the base member 18 constitute a stopper mechanism ST. The stopper mechanism ST is a mechanism for restricting leftward movement of the optical element holding member 2 with respect to the base member 18, and includes a first stopper mechanism ST1 and a second stopper mechanism ST2.

The first stopper mechanism ST1 is composed of a first contact portion 2T1 formed on the left side surface of the optical element holding member 2 and a first projecting portion 18W1 formed on the left front portion of the upper surface of the base member 18. . The second stopper mechanism ST2 is composed of a second contact portion 2T2 formed on the left side surface of the optical element holding member 2 and a second projecting portion 18W2 formed on the left rear portion of the upper surface of the base member 18. .

The first contact portion 2T1 is provided so as to contact the first projecting portion 18W1 of the base member 18 when the optical element holding member 2 moves leftward (Y1 direction) beyond a predetermined position. The second contact portion 2T2 is provided so as to contact the second projecting portion 18W2 of the base member 18 when the optical element holding member 2 moves leftward (Y1 direction) beyond the predetermined position.

The magnetic sensor 10 is configured to detect the position of the optical element OE. In this embodiment, the magnetic sensor 10 is provided so as to detect displacement in the Y-axis direction of the optical element holding member 2 to which the optical element OE is fixed. In the illustrated example, the magnetic sensor 10 has four terminals soldered to the insulating substrate 15, as shown in FIG. The insulating substrate 15 is fixed to the base member 18 with an adhesive.

In the illustrated example, the magnetic sensor 10 includes a Hall element, and measures the output voltage of the Hall element that changes according to the magnitude of the magnetic field from the driving magnet 5 received by the Hall element. It is configured to be able to detect the position of the movable side member MB. However, the magnetic sensor 10 is a giant magneto-resistive effect (GMR) element, a semiconductor magneto-resistive (SMR) element, an anisotropic magneto-resistive (AMR) element, or a tunnel magnetic field. The position of the optical element OE may be detected using a magnetoresistive element such as a Tunnel Magneto Resistive (TMR) element.

In addition, the upper surface of the base member 18 is formed with a concave portion 18S as an upward concave portion for accommodating the ball 11 therein. Specifically, the base member 18 is formed with three recesses 18S (first recess 18S1 to third recess 18S3) for accommodating the three balls 11 (first ball 11A to third ball 11C). there is

In addition, a concave portion 18</b>R as an upward concave portion for accommodating the magnetic member 17 is formed on the upper surface of the base member 18 . Specifically, the base member 18 is formed with two columnar portions protruding upward, and the two columnar portions accommodate the two magnetic members 17 (the first magnetic member 17A and the second magnetic member 17B). Two recessed portions 18R (a first recessed portion 18R1 and a second recessed portion 18R2) are formed for this purpose.

Next, with reference to FIGS. 3 and 6, the driving magnet 5, the attracting magnet 8, the coil 9, the magnetic sensor 10, the magnetic member 13, the non-magnetic member 14, and the magnetic member 17, which constitute the magnetic system. The positional relationship will be explained. 6A and 6B are trihedral views (a front view, a top view, and a right side view) of the magnetic system mounted on the optical element driving device 100 of FIG.

A magnetic system is a system that utilizes magnetic force and includes damping means AM, biasing means BM, driving means DM, magnetic attraction means MA and position detection means PD.

The driving means DM are means for driving the optical element OE in the XY plane. In the illustrated example, the drive means DM is configured to be able to move the optical element OE along the Y-axis direction. Specifically, as shown in FIG. 3, the driving means DM includes a coil 9 provided on the base member 18 and a driving magnet 5 which is spaced apart so as to face the coil 9 in the Z-axis direction. ,including. As shown in FIG. 6, the driving magnet 5 and the coil 9 are arranged to face each other with a small gap in the Z-axis direction.

When a current flows through the coil 9 as indicated by the dashed arrow AR1, the optical element holding member 2 (driving magnet 5) moves leftward with respect to the base member 18 while being guided by a ball guide structure including the balls 11, which will be described later. (Y1 direction). When a current flows through the coil 9 as indicated by the dashed arrow AR2, the optical element holding member 2 (driving magnet 5) moves rightward (Y2 direction) with respect to the base member 18 while being guided by the ball guide structure. move to This is because the Lorentz force acts on the charged particles moving in the conductive wire forming the coil 9 fixed to the base member 18, and the driving magnet 5 is moved leftward or rightward by the reaction force. .

The position detection means PD is means for detecting the position of the optical element OE fixed to the optical element holding member 2 on a virtual plane parallel to the XY plane. In the illustrated example, the position detection means PD is configured to detect the position of the optical element OE in the Y-axis direction. Specifically, as shown in FIG. 3, the position detecting means PD includes a driving magnet 5 and a magnetic sensor 10 which are arranged with a space therebetween in the vertical direction.

The magnetic attraction means MA is means for generating a magnetic force that attracts two members to each other. In the illustrated example, the magnetic attraction means MA is configured to generate a magnetic attraction force that attracts the optical element holding member 2 and the base member 18 to each other in the vertical direction (Z-axis direction). Specifically, the magnetic attraction means MA includes a drive magnet 5 , an attraction magnet 8 , and a magnetic member 13 . More specifically, the magnetic attraction means MA includes a first magnetic attraction means MA1, a second magnetic attraction means MA2, and a third magnetic attraction means MA3, as shown in FIG.

The first magnetic attraction means MA1 is configured to exert a magnetic attraction force between the first attraction magnet 8A and the first magnetic member 13A which are spaced apart from each other in the vertical direction. The second magnetic attraction means MA2 is configured to exert a magnetic attraction force between the second attraction magnet 8B and the second magnetic member 13B which are spaced apart from each other in the vertical direction. The third magnetic attraction means MA3 is configured to exert a magnetic attraction force between the drive magnet 5 and the third magnetic member 13C, which are spaced apart from each other in the vertical direction.

With this configuration, the magnetic attraction means MA can attract the optical element holding member 2 and the base member 18 to each other. Specifically, the concave portion 2S formed in the lower surface of the optical element holding member 2 is pressed against the upper portion of the ball 11. As shown in FIG. A lower portion of the ball 11 is accommodated in a recess 18S formed in the upper surface of the base member 18. As shown in FIG. Therefore, the magnetic attraction means MA can stably maintain the contact state between the optical element holding member 2 and the upper portion of the ball 11 and the contact between the lower portion of the ball 11 and the base member 18 .

In the illustrated example, each of the first ball 11A to the third ball 11C constituting the ball 11 is sandwiched between the optical element holding member 2 and the base member 18 in a rollable state in the Y-axis direction. there is Therefore, the optical element holding member 2 can be translated along the Y-axis without rotating (tilting) about the X-axis and without rotating (tilting) about the Y-axis.

In the optical element driving device 100, the distance between the first magnetic member 13A and the first attracting magnet 8A in the Z-axis direction and the distance between the second magnetic member 13B and the second attracting magnet 8B in the Z-axis direction the distance between is the same. However, those distances are smaller than the distance between the third magnetic member 13C and the drive magnet 5 in the Z-axis direction. The magnetic forces of the first attracting magnet 8A and the second attracting magnet 8B are the same, while the magnetic force of the driving magnet 5 is equal to that of the first attracting magnet 8A and the second attracting magnet 8B. because it is greater than That is, by adjusting the respective distances, the magnetic attraction forces generated by the first magnetic attraction means MA1, the second magnetic attraction means MA2, and the third magnetic attraction means MA3 are made to be approximately the same. is.

The damping means AM are means for damping the movement of the optical element holding member 2 moved by the driving means DM. In the example shown, the damping means AM are arranged to generate a force damping the reciprocating movement of the optical element holding member 2 along the Y-axis caused by the biasing means BM and the driving means DM. Specifically, the damping means AM is configured including an attracting magnet 8 and a non-magnetic member 14 . More specifically, the damping means AM includes first damping means AM1 and second damping means AM2, as shown in FIG.

The first damping means AM1 is configured to apply a magnetic force between the first attracting magnet 8A and the first non-magnetic member 14A which are spaced apart from each other in the vertical direction. The second damping means AM2 is configured to apply a magnetic force between the second attracting magnet 8B and the second non-magnetic member 14B which are spaced apart from each other in the vertical direction.

With this configuration, the damping means AM can dampen the movement of the optical element holding member 2 with respect to the base member 18 .

The biasing means BM is means for generating a magnetic force between two members in the horizontal direction (Y-axis direction). In the illustrated example, the biasing means BM is configured to generate a force that presses the optical element holding member 2 against the base member 18 in the left-right direction (Y-axis direction). Specifically, the biasing means BM is configured to include the attracting magnet 8 and the magnetic member 17, and utilizes the repulsive force (repulsive force) acting between the attracting magnet 8 and the magnetic member 17 to move the base. It is configured to press the optical element holding member 2 (attracting magnet 8) to the left against the member 18 (magnetic member 17). More specifically, the biasing means BM includes first biasing means BM1 and second biasing means BM2, as shown in FIG.

The first biasing means BM1 is configured to exert a magnetic repulsive force between the first attracting magnet 8A and the first magnetic member 17A, which are spaced apart from each other in the left-right direction. The second biasing means BM2 is configured to exert a magnetic repulsive force between the second attracting magnet 8B and the second magnetic member 17B, which are spaced apart from each other in the left-right direction.

With this configuration, the biasing means BM abuts the left end surface (Y1 side end surface) of the contact portion 2T of the optical element holding member 2 against the right side surface (Y2 side side surface) of the projecting portion 18W of the base member 18. can be brought into contact. Therefore, the biasing means BM can stably maintain the state in which the optical element holding member 2 is pressed against the base member 18 in the Y-axis direction.

In the illustrated example, in the initial state of the optical element driving device 100, the urging means BM is positioned on the right side surface (the side surface on the Y2 side) of the projecting portion 18W of the base member 18 and the left end surface of the contact portion 2T of the optical element holding member 2. (the end face on the Y1 side) can be maintained in contact with each other. The initial state of the optical element driving device 100 means the state of the optical element driving device 100 when no current is supplied to the coil 9 . Further, the position of the optical element holding member 2 when the optical element driving device 100 is in the initial state is also called "initial position".

Alternatively, the biasing means BM utilizes the attraction force acting between the attraction magnet 8 and the magnetic member 17 to push the optical element holding member 2 (attraction magnet 8) against the base member 18 (magnetic member 17). may be configured to press the In this case, the magnetic member 17 may be a permanent magnet or a non-permanent magnetic material. Specifically, the urging means BM is arranged on the left side of the attraction magnet 8 so as to face the attraction magnet 8 so as to attract the attraction magnet 8 to the left. ), it may be a magnetic body that is not a permanent magnet.

Next, referring to FIG. 7, the ball housing structure will be described. FIG. 7 is a cross-sectional view of the ball containing structure. Specifically, the left diagram of FIG. 7 shows cross sections of the optical element holding member 2, the second ball 11B, and the base member 18 on a virtual plane parallel to the XZ plane including the dashed line L1 in the lower diagram of FIG. The right diagram of FIG. 7 shows cross sections of the optical element holding member 2, the third ball 11C, and the base member 18 on a virtual plane parallel to the XZ plane including the dashed line L2 in the lower diagram of FIG.

The ball housing structure is a structure that houses the ball 11 . Specifically, the ball housing structure is composed of a pair of wide grooves that do not restrict the moving direction of the balls 11 and two pairs of narrow grooves that restrict the moving directions of the balls 11 .

Also, the two pairs of narrow grooves that regulate the moving direction of the ball 11 constitute a ball guide structure. The ball guide structure is a structure that guides the moving direction of the ball 11 . In the illustrated example, the ball guide structure is configured to guide movement of the ball 11 along the Y-axis direction.

Specifically, as shown in the left diagram of FIG. It is a combination with the formed downward second concave portion 2S2.

Moreover, in the pair of wide grooves in the ball housing structure, as shown in the left diagram of FIG. It is sandwiched between the second recess 18S2 and the second recess 2S2 while being in contact with the recess 18S2.

That is, in the pair of wide grooves in the ball housing structure, as shown in the left diagram of FIG. 7, the width of the opening (open end) of the second recess 2S2 in the X-axis direction The width of each opening (open end) is formed to be larger than the diameter D1 of the second ball 11B. Moreover, the width D2 of the bottom surface of the second recess 2S2 in the X-axis direction and the width D3 of the bottom surface of the second recess 18S2 in the X-axis direction are both larger than the diameter D1 of the second ball 11B. formed.

One pair of the two pairs of narrow grooves in the ball housing structure is, as shown in the right diagram of FIG. It is a combination with the downward third concave portion 2S3 formed in . Another pair (not shown in FIG. 7) of the two pairs of narrow grooves in the ball housing structure are formed by an upward first concave portion 18S1 (see FIG. 5) formed on the upper surface of the base member 18 and an optical groove. This is a combination with the downward facing first concave portion 2S1 (see the upper diagram in FIG. 4) formed in the lower surface of the element holding member 2. FIG.

Also, in one pair of the two pairs of narrow grooves in the ball housing structure, as shown in the right diagram of FIG. Moreover, it is sandwiched between the third recess 18S3 and the third recess 2S3 so that the two contacts CP13 and CP14 are in contact with the third recess 18S3. In another pair (not shown) of the two pairs of narrow grooves in the ball housing structure, the first ball 11A is in contact with the first recess 2S1 at two points of contact and the first recess 2S1 at two points of contact. It is sandwiched between the first recess 18S1 and the first recess 2S1 so as to be in contact with the recess 18S1.

That is, in one pair of the two pairs of narrow grooves in the ball housing structure, as shown in the right diagram of FIG. 7, the width of the opening (open end) of the third recess 2S3 in the X-axis direction The width of the opening (open end) of the third recess 18S3 is formed to be larger than the diameter D11 of the third ball 11C. Moreover, the width D12 of the bottom surface of the third recess 2S3 in the X-axis direction and the width D13 of the bottom surface of the third recess 18S3 in the X-axis direction are both smaller than the diameter D11 of the third ball 11C. formed. In other words, both the third recess 2S3 and the third recess 18S3 are configured such that the distance between the two side surfaces facing each other in the X-axis direction increases toward the open end (opening). The same is true for another pair of the two pairs of narrow grooves (not shown in FIG. 7) in the ball receiving structure.

The two pairs of narrow grooves in this ball housing structure, ie, the ball guide structure, guide the ball 11 to move along the Y-axis direction while being restricted so as not to move along the X-axis direction. .

Next, the positional relationship among the driving magnet 5, the attracting magnet 8, the ball 11, and the magnetic member 17 will be described with reference to FIG. FIG. 8 is a top view of the driving magnet 5, the attracting magnet 8, the ball 11, and the magnetic member 17 that constitute the optical element driving device 100. FIG.

A first triangle TR1 indicated by a dashed line is a triangle formed by connecting the center of the driving magnet 5 and the centers of the two attracting magnets 8 (the first attracting magnet 8A and the second attracting magnet 8B). be. The center of each member is, for example, the center of gravity of each member. The same applies to the following description.

A second triangle TR2 indicated by a dashed line is a triangle formed by connecting the respective centers of the three balls 11 (first ball 11A, second ball 11B, and third ball 11C). The second triangle TR2 is oriented substantially opposite to the first triangle TR1.

In the illustrated example, the first ball 11A is positioned outside the first triangle TR1 and arranged to face the third side TR1T of the first triangle TR1. The second ball 11B is positioned outside the first triangle TR1 and arranged to face the first side TR1F of the first triangle TR1. The third ball 11C is positioned outside the first triangle TR1 and arranged to face the second side TR1S of the first triangle TR1.

The point CG1 is the center of gravity of the first triangle TR1 and the point CG2 is the center of gravity of the second triangle TR2. In the illustrated example, both the point CG1 and the point CG2 are located within the region where the first triangle TR1 and the second triangle TR2 overlap. In FIG. 8, for clarity, a cross pattern is added to the overlapping region of the first triangle TR1 and the second triangle TR2.

With this arrangement, the optical element holding member 2 can rotate on the base member 18 via the three balls 11 around the X, Y, and Z axes, and can rotate in the X axis direction. And it is supported in a well-balanced manner so that it does not move in parallel in the Z-axis direction and can move in parallel in the Y-axis direction.

With the configuration as described above, the optical element driving device 100 realizes return means (urging means) for returning the optical element holding member (movable side member) to the initial position using a member such as a coil spring or a shaft. This provides an effect that the generation of foreign matter can be suppressed as compared with the configuration in which the This is because the biasing means BM for moving the optical element holding member 2 in the first direction (Y-axis direction) with respect to the support member (base member 18) is implemented using magnetic force. That is, this configuration realizes the biasing means BM for returning the optical element holding member 2 to the initial position without using a member such as a coil spring or a shaft.

Next, an optical element driving device 100A, which is another structural example of the optical element driving device 100, will be described with reference to FIGS. 9 to 15. FIG. FIG. 9 is a perspective view of the optical element driving device 100A and corresponds to FIG. FIG. 10 is an exploded perspective view of the optical element driving device 100A composed of the case 4 and the lower member LB, and shows a state where the case 4 is separated from the lower member LB, corresponding to FIG. . FIG. 11 is an exploded perspective view of the lower member LB, showing a state in which the movable side member MB is separated from the fixed side member FB, and corresponds to FIG. FIG. 12 is a bottom view of the optical element holding member 2 constituting the optical element driving device 100A, and corresponds to FIG. FIG. 13 is an exploded perspective view of the fixed side member FB forming the optical element driving device 100A, and corresponds to FIG. FIG. 14 is a trihedral view (front view, top view, and right side view) of the magnetic system mounted on the optical element driving device 100A, and corresponds to FIG. FIG. 15 is a top view of the driving magnet 5, the attracting magnet 8, the ball 11, and the magnetic member 17 that constitute the optical element driving device 100A, and corresponds to FIG.

In the optical element driving device 100A, as shown in FIG. 11, the stopper mechanism ST is arranged on the opposite side of the driving means DM with the optical element OE interposed therebetween. It is different from the optical element driving device 100 which is arranged on the same side as the driving means DM with respect to .

Specifically, in the optical element driving device 100A, as shown in FIG. 11, the stopper mechanism ST is provided in the hole portion 2W provided in the third side portion 2E3 of the optical element holding member 2 and in the upper surface of the base member . It is composed of a protruding portion 18W formed by Incidentally, in the optical element driving device 100, as shown in FIG. It is composed of a projecting portion 18W.

In the example shown in FIG. 11, the hole 2W is a substantially rectangular through-hole penetrating through the optical element holding member 2 in the vertical direction. However, the hole 2W may be a downward concave portion formed in the lower surface of the optical element holding member 2 . That is, the hole 2W does not have to penetrate the optical element holding member 2 in the vertical direction.

More specifically, in the optical element driving device 100A, the hole 2W includes a first hole 2W1 and a second hole 2W2, and the protrusion 18W includes a first protrusion 18W1 and a second protrusion 18W2. The stopper mechanism ST includes a first stopper mechanism ST1 composed of a first hole portion 2W1 and a first projecting portion 18W1, and a second stopper mechanism ST1 composed of a second hole portion 2W2 and a second projecting portion 18W2. Includes mechanism ST2.

In the first stopper mechanism ST1, when the optical element holding member 2 moves leftward (in the Y1 direction) beyond the predetermined position, the right side surface (the side surface on the Y2 side) of the first projection 18W1 becomes the first hole. It is configured to be pressed against the inner wall surface on the right side (Y2 side) of the portion 2W1. Similarly, in the second stopper mechanism ST2, when the optical element holding member 2 moves leftward (Y1 direction) beyond the predetermined position, the right side surface (Y2 side side surface) of the second protrusion 18W2 is It is configured to be pressed against the inner wall surface on the right side (Y2 side) of the second hole 2W2.

In the example shown in FIG. 11, in the initial state of the optical element driving device 100A, the biasing means BM composed of the attracting magnet 8 and the magnetic member 17 is mounted on the right side surface (the side surface on the Y2 side) of the projecting portion 18W of the base member 18. ) and the inner wall surface on the right side (Y2 side) of the hole 2W of the optical element holding member 2 can be maintained in contact with each other. The initial state of the optical element driving device 100A means the state of the optical element driving device 100A when the coil 9 is not supplied with current.

11, the optical element driving apparatus 100A has an optical element driving apparatus in which the coil 9 (see FIG. 5) is attached to the upper surface of the base member 18 in that the coil 9 is formed on the insulating substrate 15 as shown in FIG. Differs from device 100 .

Specifically, in the optical element driving device 100A, as shown in FIG. 11, the insulating substrate 15 is a multi-layer substrate in which a plurality of layers on which a spiral conductive pattern forming the coil 9 is formed are laminated. As shown in FIG. 13, the magnetic sensor 10 is mounted on the lower surface of the insulating substrate 15 and accommodated in the concave portion 18B formed on the upper surface of the base member 18. As shown in FIG. 13 and 14 schematically show the coil 9 by extracting the coil in the insulating substrate 15 formed of a conductive pattern.

Further, the optical element driving device 100A differs from the optical element driving device 100 having the nonmagnetic member 14 (attenuation means AM) in that the nonmagnetic member 14 (attenuation means AM) is omitted. However, the optical element driving device 100A may be configured to have the non-magnetic member 14 (attenuation means AM). In this case, the nonmagnetic member 14 includes a first nonmagnetic member 14A adhesively fixed to the upper surface of the first magnetic member 13A and a second nonmagnetic member 14B adhesively fixed to the upper surface of the second magnetic member 13B. You can stay.

Next, the positional relationship among the driving magnet 5, the attracting magnet 8, the ball 11, and the magnetic member 17 in the optical element driving device 100A will be described with reference to FIG.

A first triangle TR11 indicated by a dashed line is a triangle formed by connecting the center of the driving magnet 5 and the centers of the two attracting magnets 8 (the first attracting magnet 8A and the second attracting magnet 8B). be.

A second triangle TR12 indicated by a dashed line is a triangle formed by connecting the respective centers of the three balls 11 (first ball 11A, second ball 11B, and third ball 11C).

In the illustrated example, the first ball 11A is positioned outside the first triangle TR11 and arranged to face the third side TR11T, which is one side of the first triangle TR11. The second ball 11B is positioned outside the first triangle TR11 and arranged to face the first side TR11F, which is the other side of the first triangle TR11. The third ball 11C is positioned outside the first triangle TR11 and arranged to face the second side TR11S, which is the remaining side of the first triangle TR11.

The point CG11 is the center of gravity of the first triangle TR11, and the point CG12 is the center of gravity of the second triangle TR12. In the illustrated example, both the point CG11 and the point CG12 are located within the area where the first triangle TR11 and the second triangle TR12 overlap. In FIG. 15, for clarity, a cross pattern is given to the overlapping region of the first triangle TR11 and the second triangle TR12.

With this arrangement, the optical element holding member 2 can rotate on the base member 18 via the three balls 11 around the X, Y, and Z axes, and can rotate in the X axis direction. And it is supported in a well-balanced manner so that it does not move in parallel in the Z-axis direction and can move in parallel in the Y-axis direction.

With the configuration as described above, the optical element driving device 100A, like the optical element driving device 100, implements biasing means for returning the optical element holding member to the initial position using a member such as a coil spring or a shaft. This provides an effect that the generation of foreign matter can be suppressed as compared with the configuration in which the This is because the biasing means BM for moving the optical element holding member 2 in the first direction (Y-axis direction) with respect to the support member (base member 18) is implemented using magnetic force. That is, this configuration realizes the biasing means BM without using a member such as a coil spring or a shaft.

As described above, the optical element driving device 100 according to the embodiment of the present invention has a fixed side member FB including a support member (base member 18) and an optical element OE, as shown in FIGS. an optical element holding member 2 having a through hole 2K penetrating in a possible vertical direction (Z-axis direction); , a magnetic attraction means MA for generating a force to mutually attract the optical element holding member 2 and the support member (base member 18) arranged with the ball 11 interposed therebetween in the vertical direction; and driving means DM for moving the element holding member 2 in a first direction (Y-axis direction) orthogonal to the vertical direction. The magnetic attraction means MA includes a magnetic member 13 provided on a supporting member (base member 18) so that an attractive force acts between the attracting magnet 8 fixed to the optical element holding member 2 and the attracting magnet 8. (first magnetic member 13A and second magnetic member 13B). Further, the fixed-side member FB has a magnetic member 17 different from the magnetic member 13 . The magnetic member 17 is spaced apart from the attracting magnet 8 in the first direction so that a magnetic force (attractive force or repulsive force) acts between the attracting magnet 8 and the magnetic member 17 . That is, the attracting magnet 8 and the magnetic member 17 constitute biasing means BM for generating a force for moving the optical element holding member 2 with respect to the base member 18 in the first direction. The fixed-side member FB is provided with a restricting portion (protruding portion 18W) that abuts against the optical element holding member 2 that moves in the first direction. The same applies to the optical element driving device 100A shown in FIGS. 10 and 11. FIG. Note that the support member may be the case 4 .

This configuration has the effect of suppressing the generation of foreign matter, as compared with a configuration in which a member such as a coil spring or a shaft is used to return the optical element holding member to the initial position. This is because the biasing means BM for moving the optical element holding member 2 in the first direction (Y-axis direction) with respect to the support member (base member 18) is implemented using magnetic force. That is, this configuration realizes the biasing means BM for returning the optical element holding member 2 to the initial position without using a member such as a coil spring or a shaft.

In addition, this configuration brings about the effect that the attracting magnet 8 that constitutes the magnetic attracting means MA is also used as the magnet that constitutes the biasing means BM.

Also, the magnetic member 17 may be a magnet. In this case, the magnetic force acting between the attracting magnet 8 and the magnetic member 17 is repulsive force (repulsive force).

This configuration has the effect of reducing overshoot that occurs when the optical element holding member 2 is positioned at a desired position. This is because the direction of the force generated by the driving means DM and the direction of the force generated by the biasing means BM are opposite to each other.

Also, two attracting magnets 8 may be spaced apart in a second direction (X-axis direction) orthogonal to the first direction. In this case, two magnetic members 17 may be spaced apart in the second direction so as to face the two attracting magnets 8 . In the example shown in FIG. 3, the attracting magnets 8 include a first attracting magnet 8A and a second attracting magnet 8B. The magnetic member 17 includes a first magnetic member 17A that is spaced apart in the first direction so as to face the first attracting magnet 8A, and a first magnetic member 17A that is arranged in the first direction so as to face the second attracting magnet 8B. and a spaced apart second magnetic member 17B. Note that the attracting magnet 8 is such that the distance between the first attracting magnet 8A and the second attracting magnet 8B in the second direction (X-axis direction) is the width of the through hole 18K in the base member 18 ( length). The same applies to the example shown in FIG.

This configuration brings about an effect that the biasing means BM composed of the attracting magnet 8 and the magnetic member 17 can stably return the optical element holding member 2 to the initial position. This configuration is because the rotation of the optical element holding member 2 around the Z axis can be suppressed as compared with the case where the biasing means BM includes only one of the first biasing means BM1 and the second biasing means BM2. .

The driving means DM may also include a driving magnet 5 and a coil 9, as shown in FIG. In this case, the driving magnet 5 may be provided on the optical element holding member 2 . Also, the coil 9 facing the driving magnet 5 may be provided on the support member (base member 18). Further, another magnetic member (third magnetic member 13C) may be arranged below the coil 9 . In this case, an attractive force acts between yet another magnetic member (third magnetic member 13C) and the driving magnet 5 . The same applies to the example shown in FIG.

This configuration provides an effect that the ball 11 is stably held between the optical element holding member 2 and the base member 18 . With the ball 11 sandwiched between the optical element holding member 2 and the base member 18 by the three magnetic attraction means MA (first magnetic attraction means MA1 to third magnetic attraction means MA3), the optical element holding member 2 and the base member 18 are attracted to each other.

Further, when three balls 11 are arranged between the supporting member (base member 18) and the optical element holding member 2, in a plan view along the vertical direction, as shown in FIG. Each of the balls 11 may be arranged so as to be positioned outside the first triangle TR1. A second ball 11B, which is one of the three balls 11, is arranged to face the first side TR1F of the first triangle TR1, and a second ball 11B, which is another one of the three balls 11, is arranged to face the first side TR1F of the first triangle TR1. The three balls 11C are arranged to face the second side TR1S of the first triangle TR1, and the first ball 11A, which is the remaining one of the three balls 11, is arranged to face the third side TR1T of the first triangle TR1. may be arranged so as to face the

The first triangle TR1 is a triangle formed by connecting the center of the drive magnet 5 and the centers of the two attracting magnets 8, respectively. A first side TR1F of the first triangle TR1 is a side connecting the center of the driving magnet 5 and the center of the second attracting magnet 8B, which is one of the two attracting magnets 8. A second side TR1S of TR1 is a side connecting the center of the driving magnet 5 and the center of the first attracting magnet 8A, which is the other of the two attracting magnets 8, and is the third side of the first triangle TR1. TR1T is a side connecting the respective centers of the two attracting magnets 8 .

This configuration allows the ball 11 to be stably held between the optical element holding member 2 and the base member 18 by three magnets (driving magnet 5, first attracting magnet 8A, and second attracting magnet 8B). have the effect of becoming As a result, this configuration brings about an effect that the movement of the optical element holding member 2 with respect to the base member 18 can be stabilized. As shown in FIG. 8, a first triangle TR1 and a second triangle TR2 formed by connecting the respective centers of three balls 11 (first ball 11A, second ball 11B, and third ball 11C) This is because they overlap each other in a substantially opposite direction. The same applies to the example shown in FIG.

A non-magnetic member 14 that generates an eddy current when the attracting magnet 8 moves may be provided so as to overlap the magnetic member 13 . In this case, the nonmagnetic member 14 is preferably made of a metal having a higher electrical conductivity than the magnetic member 13 and is provided above the magnetic member 13 . In the example shown in FIG. 3, the non-magnetic member 14 is made of aluminum. Incidentally, the non-magnetic member 14 may be made of copper.

This configuration brings about the effect that the movement of the optical element holding member 2 with respect to the base member 18 can be damped more quickly than when the non-magnetic member 14 is not arranged. That is, this configuration can enhance the damping effect of the damping means AM (the effect of damping the movement of the optical element holding member 2 moved by the driving means DM).

Further, as shown in FIG. 11, the support member (base member 18) has a first projecting portion 18W1 and a second projecting portion 18W2 that project upward and are spaced apart in a second direction orthogonal to the first direction. may have been The optical element holding member 2 may be provided with a first hole 2W1 into which the first projection 18W1 is inserted and a second hole 2W2 into which the second projection 18W2 is inserted. In this case, the first projecting portion 18W1 and the second projecting portion 18W2 constitute a restricting portion that restricts movement of the optical element holding member 2 with respect to the supporting member (base member 18) in the first direction. At least one ball 11 (first ball 11A) is arranged between the first projecting portion 18W1 and the second projecting portion 18W2 in the second direction, and the outside of the first projecting portion 18W1 in the second direction is arranged. and the magnetic member 17 (the first magnetic member 17A and the second magnetic member 17B) may be arranged on the outside of the second projecting portion 18W2. Two attracting magnets 8 (first attracting magnet 8A and second attracting magnet 8B) may be fixed to the optical element holding member 2 so as to correspond to the two magnetic members 17 .

In the example shown in FIG. 11, the first ball 11A is arranged between the first protrusion 18W1 and the second protrusion 18W2 in the second direction, and the outer side of the first protrusion 18W1 in the second direction 17 A of 1st magnetic members are arrange|positioned, and the 2nd magnetic member 17B is arrange|positioned outside the 2nd protrusion part 18W2 in a 2nd direction. A first attracting magnet 8A is fixed to the optical element holding member 2 so as to correspond to the first magnetic member 17A, and a second attracting magnet 8B is fixed to the optical element holding member 2 so as to correspond to the second magnetic member 17B. It is fixed to the member 2.

This configuration reduces the dead space in the housing HS compared to the case where the stopper mechanism ST is composed of the contact portion 2T of the optical element holding member 2 and the projecting portion 18W of the base member 18 as shown in FIG. This brings about the effect that the size of the optical element driving device 100A can be reduced.

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 driving means DM is composed of one driving magnet 5 and one coil 9, but a pair of driving magnets 5 and a pair and the coil 9 of .

Further, in the above-described embodiment, the driving means DM is composed of the driving magnet 5 and the coil 9, but may be composed of a piezoelectric element, a shape memory alloy wire, or the like.

2... Optical element holding member 2C... Corner 2C1... First corner 2C2... Second corner 2C3... Third corner 2C4... Fourth corner 2E... Side portion 2E1 First side portion 2E2 Second side portion 2E3 Third side portion 2E4 Fourth side portion 2F Projecting portion 2K Through hole 2P Recess 2P1 First recess 2P2 Second recess 2R Recess 2S Recess 2S1 First recess 2S2 Second recess 2S3 Third recess 2T Contact portion 2T1 First contact portion 2T2 Second contact portion 2W Hole 2W1 First hole 2W2 Second hole 4 Case 4A Peripheral wall portion 4A1 First side plate portion 4A2 Second side plate portion 4A3 Third side plate portion 4A4 Fourth side plate portion 4B Top plate portion 4K Through hole 4S...Accommodating portion 5...Driving magnet 8...Attracting magnet 8A...First attracting magnet 8B...Second attracting magnet 9...Coil 10...Magnetic sensor 11 Ball 11A First ball 11B Second ball 11C Third ball 13 Magnetic member 13A First magnetic member 13B Second magnetic member 13C Third magnetic member 14 Non-magnetic member 14A First non-magnetic member 14B Second non-magnetic member 15 Insulating substrate 17 Magnetic member 17A First magnetic member 17B... Second magnetic member 18... Base member 18B... Concave part 18K... Through hole 18P... Convex part 18R... Concave part 18R1... First concave part 18R2... Second concave part 18S... Recess 18S1... First recess 18S2... Second recess 18S3... Third recess 18U... Recess 18U1... First recess 18U2... Second recess 18U3... Third 3 recesses 18W... Protruding part 18W1... First protruding part 18W2... Second protruding part 100, 100A... Optical element driving device AM... Attenuation means AM1... First attenuation means AM2. Second Damping Means BM Biasing Means BM1 First Biasing Means BM2 Second Biasing Means CG1, CG2, CG11, CG12 Points CP1, CP2, CP11 to CP14・Contact point DM Driving means FB Fixed side member HS Housing LB Lower member MA Magnetic attraction means MA1 First magnetic attraction means MA2 Second 2 magnetic attraction means MA3... third magnetic attraction means MB... movable side member OE... optical element PD... position detection means ST... stopper mechanism ST1... first stopper mechanism ST2...・Second stopper mechanism TR1, TR11 First triangle TR2, TR12 Second triangle TR1F, TR11F First side TR1S, TR11S Second side TR1T, TR11T Third side

Claims (9)

a stationary member including a support member;
an optical element holding member having a through hole extending vertically through which an optical element can be arranged;
at least three balls arranged between the support member and the optical element holding member in the vertical direction;
magnetic attraction means for generating a force to mutually attract the optical element holding member and the support member arranged with the ball interposed therebetween in the vertical direction;
driving means for moving the optical element holding member with respect to the support member in a first direction orthogonal to the vertical direction;
The optical element, wherein the magnetic attraction means includes an attraction magnet fixed to the optical element holding member, and a magnetic member provided on the support member so that an attraction force acts between the attraction magnet and the attraction magnet. in the drive,
The stationary member has another magnetic member,
the another magnetic member is arranged apart from the attraction magnet in the first direction so that a magnetic force acts between the attraction magnet and the another magnetic member;
The optical element driving device, wherein the fixed side member is provided with a regulating portion that abuts against the optical element holding member that moves in the first direction. the another magnetic member is a magnet,
The magnetic force acting between the attracting magnet and the another magnetic member is a repulsive force,
The optical element driving device according to claim 1. Two of the attracting magnets are spaced apart in a second direction orthogonal to the first direction,
Two of the separate magnetic members are spaced apart in the second direction so as to face the two attracting magnets,
3. The optical element driving device according to claim 2. the driving means includes a driving magnet and a coil;
The driving magnet is provided on the optical element holding member,
The coil facing the driving magnet is provided on the support member,
Another magnetic member is arranged below the coil,
An attractive force acts between the further magnetic member and the driving magnet,
4. The optical element driving device according to claim 3. Three balls are arranged between the support member and the optical element holding member,
Each of the three balls is positioned outside a first triangle formed by connecting the center of the drive magnet and the center of each of the two attraction magnets in a plan view along the vertical direction. ,
One of the three balls is the first side of the first triangle that connects the center of the driving magnet and the center of one of the two attracting magnets in plan view along the vertical direction. is arranged to face the
Another one of the three balls is the first triangle connecting the center of the driving magnet and the center of the other of the two attracting magnets in plan view along the vertical direction. arranged so as to face two sides,
The remaining one of the three balls is arranged to face the third side of the first triangle connecting the respective centers of the two attraction magnets in plan view along the vertical direction. ,
5. The optical element driving device according to claim 4. A non-magnetic member that generates an eddy current when the attraction magnet moves is provided so as to overlap the magnetic member,
6. The optical element driving device according to any one of claims 1 to 5. The non-magnetic member is formed of a metal having a higher conductivity than the magnetic member, and is provided above the magnetic member.
7. The optical element driving device according to claim 6. The non-magnetic member is made of aluminum or copper,
The optical element driving device according to claim 7. The supporting member has a first projecting portion and a second projecting portion which project upward and are spaced apart in a second direction orthogonal to the first direction,
The optical element holding member is provided with a first hole into which the first projection is inserted and a second hole into which the second projection is inserted,
The first projecting portion and the second projecting portion constitute the restricting portion,
At least one ball is arranged between the first protrusion and the second protrusion in the second direction, and the ball is disposed outside the first protrusion and the second protrusion in the second direction. The separate magnetic member is arranged on each of the outer sides of the
Two of the attracting magnets are fixed to the optical element holding member so as to correspond to the two different magnetic members.
The optical element driving device according to claim 1.

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