CN116819713A - Optical element driving device - Google Patents

Optical element driving device Download PDF

Info

Publication number
CN116819713A
CN116819713A CN202310302153.0A CN202310302153A CN116819713A CN 116819713 A CN116819713 A CN 116819713A CN 202310302153 A CN202310302153 A CN 202310302153A CN 116819713 A CN116819713 A CN 116819713A
Authority
CN
China
Prior art keywords
movable
optical element
magnetic member
side magnetic
element holding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310302153.0A
Other languages
Chinese (zh)
Inventor
大友胜彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of CN116819713A publication Critical patent/CN116819713A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets

Abstract

The invention aims to increase the movement amount of an optical element holding member without excessively increasing the magnitude of a current flowing in a coil. The optical element driving device (100) attracts the movable-side magnetic member (4) to the iron core part (8W) side by electromagnetic force, thereby moving the optical element holding member (5). The core section has a first tip section (8W 1) and a second tip section (8W 2). The movable-side magnetic member has a first movable-side magnetic member (4A) facing the first tip end portion and a second movable-side magnetic member (4B) facing the second tip end portion. When the optical element holding member is positioned at the first position, a first gap (G1) between the first distal end portion and the first movable-side magnetic member is smaller than a second gap (G2) between the second distal end portion and the second movable-side magnetic member, and is larger than a first gap when the optical element holding member is positioned at the second position, and the second gap is larger than a second gap when the optical element holding member is positioned at the second position.

Description

Optical element driving device
Technical Field
The present disclosure relates to an optical element driving device.
Background
Conventionally, a lens driving device is known in which a lens holder as an optical element holding member is moved up and down with respect to a fixed-side member (see patent document 1). The lens driving device is configured to: the metal plate material fixed to the lens holder is attracted by electromagnetic force generated by an electromagnet formed by a coil wound around a part (iron core) of the fixing side member, whereby the lens holder can be moved downward with respect to the fixing side member.
Prior art literature
Patent literature
Patent document 1 Japanese patent application laid-open No. 2011-158714
Disclosure of Invention
Problems to be solved by the invention
However, in this configuration, the larger the movable amount of the lens holder is, the larger the distance between the metal plate and the iron core becomes, and the larger the magnitude of the current flowing through the coil may be. This is because the magnitude of the electromagnetic force becomes small in inverse proportion to the distance between the metal plate and the iron core.
Therefore, it is desirable to increase the amount of movement of the optical element holding member without excessively increasing the magnitude of the current flowing in the coil.
Solution for solving the problem
An optical element driving device according to an embodiment of the present invention includes: a fixed side member; an optical element holding member having an opening through which an optical element can be arranged in the vertical direction; a support member that supports the optical element holding member so as to be movable with respect to the fixed-side member; a movable-side magnetic member coupled to the optical element holding member; and an electromagnetic mechanism including a fixed-side magnetic member having an iron core portion and a coil wound around the iron core portion, the movable-side magnetic member being attracted toward the iron core portion by electromagnetic force, the optical element holding member being moved from a first position to a second position in the up-down direction, the iron core portion having a first distal end portion and a second distal end portion, the movable-side magnetic member having: a first movable-side magnetic member coupled to the optical element holding member in a state of being opposed to the first distal end portion in the up-down direction; and a second movable-side magnetic member coupled to the optical element holding member in a state of being opposed to the second distal end portion in the up-down direction, wherein a first interval between the first distal end portion and the first movable-side magnetic member in the up-down direction is smaller than a second interval between the second distal end portion and the second movable-side magnetic member in the up-down direction when the optical element holding member is located at the first position, and the first interval when the optical element holding member is located at the first position is larger than the first interval when the optical element holding member is located at the second position, and the second interval when the optical element holding member is located at the first position is larger than the second interval when the optical element holding member is located at the second position.
Effects of the invention
The optical element driving device described above can increase the amount of movement of the optical element holding member without excessively increasing the current flowing in the coil.
Drawings
Fig. 1 is a perspective view showing an exemplary configuration of an optical element driving device.
Fig. 2 is an exploded perspective view of the optical element driving device.
Fig. 3 is a lower perspective view of the frame member.
Fig. 4 is an exploded perspective view of the lower member.
Fig. 5 is an exploded perspective view of the movable-side member and the fixed-side magnetic member.
Fig. 6 is a plan view of the movable-side member.
Fig. 7 is a perspective view of the movable-side member.
Fig. 8A is a right side view of the optical element driving device in a state where the cover member is detached.
Fig. 8B is a right side view of the optical element driving device in a state where the cover member is detached.
Fig. 8C is a right side view of the optical element driving device in a state where the cover member is detached.
Fig. 8D is a right side view of the optical element driving device in a state where the cover member is detached.
Fig. 9A is a right side view of the movable-side magnetic member, the optical element holding member, and the fixed-side magnetic member.
Fig. 9B is a right side view of the movable-side magnetic member, the optical element holding member, and the fixed-side magnetic member.
Fig. 9C is a right side view of the movable-side magnetic member, the optical element holding member, and the fixed-side magnetic member.
Fig. 9D is a right side view of the movable-side magnetic member, the optical element holding member, and the fixed-side magnetic member.
Description of the reference numerals
1 cover member 1A first side peripheral wall portion 1A2 second side peripheral wall portion 1A3 third side plate portion 1A4 fourth side plate portion 1B top plate portion 1K opening 1S housing portion 2S stopper 2SL left side stopper 2SR right side stopper 2U projection setting portion 3 upper leaf spring 3E outer side 3G resilient arm portion 3I movable side magnetic member 4A first movable side magnetic member 4B second movable side magnetic member 4C third movable side magnetic member 4F projection piece 4F1 first projection piece 4F1 second projection piece 4F3 third projection piece 4FL1 first left side projection piece 4FL3 second left side projection piece 4FR3 third left side projection piece 4FR1 first right side projection piece 4FR2 third right side projection piece 4FR1 first the coupling portion 4V2 second coupling portion 4V3 third coupling portion 5 optical element holding member 5C cylindrical portion 5F projecting portion 5F1 first projecting portion 5F2 second projecting portion 5F3 third projecting portion 5K opening 5P rotation restriction portion 5PL left-side rotation restriction portion 5PR right-side rotation restriction portion 6 lower leaf spring 6E outer side portion 6G elastic arm portion 6I inner side portion 7L coil 7L left-side coil 7R right-side coil 8 fixing side magnetic member 8C base portion 8H through hole 8K opening 8W core portion 8W1 first tip end portion 8W2 second tip end portion 8W3 third tip end portion 8WL1 left-side core portion 8WL2 second left-side tip end portion 8WR3 third left-side tip end portion 8 right core portion 8 1 first right-side tip end portion 8WR2 second right-side tip end portion 8WR3 third right-side tip end portion 9 base member 9K opening 9P columnar portion 9Q, the 9T … protrusion 10a … first metal member 10AP … first connecting portion 10AT … first terminal portion 10B … second metal member 10BP … second connecting portion 10BT … second terminal portion 10C … third metal member 10CPL … third left connecting portion 10CPR … third right connecting portion 11 … spacer member 11a … first spacer member 11B … second spacer member 100 … optical element driving device DM … electromagnetic mechanism DM1 … first electromagnetic mechanism DM2 … second electromagnetic mechanism FB … fixed side member HS … housing LB … lower side member MB … movable side member OA … optical axis SB … supporting member SD … solder.
Detailed Description
An optical element driving device 100, which is an example of the configuration of an optical element driving device according to an embodiment of the present invention, will be described below with reference to the drawings. Fig. 1 is a perspective view of an optical element driving device 100. Fig. 2 is an exploded perspective view of the optical element driving device 100.
In fig. 1, X1 represents one direction of an X axis constituting a three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X axis. Further, Y1 represents one direction of the Y axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y axis. Likewise, Z1 represents one direction of the Z axis constituting 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 view side) of the optical element driving device 100, and the X2 side of the optical element driving device 100 corresponds to the rear side (rear view 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. In addition, 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. The same is true for other components in other figures.
The optical element driving device 100 is a device for moving an optical element (not shown) in the up-down direction. In the illustrated example, the optical element driving device 100 is configured to be capable of moving up and down an optical element having a cylindrical shape, but may be configured to move up and down an optical element having another shape such as a rectangular parallelepiped shape. The optical element is, for example, a lens body, a mirror, a prism, a diffraction grating, a light emitting element, a light receiving element, an image pickup element, an optical filter, or the like. The lens body is a cylindrical lens barrel having at least one lens. In the example of the figure, the optical element is a lens body. Therefore, hereinafter, the upper side of the optical element driving device 100 may be referred to as "imaging object side", the lower side of the optical element driving device 100 may be referred to as "imaging element side", and the up-down direction may be referred to as "optical axis direction". In addition, the "optical axis direction" includes a direction with respect to the optical axis OA of the lens body and a direction parallel to the optical axis OA.
As shown in fig. 2, the optical element driving apparatus 100 includes: the cover member 1, the frame member 2, the upper side plate spring 3, the movable side magnetic member 4, the optical element holding member 5, the lower side plate spring 6, the coil 7, the fixed side magnetic member 8, the base member 9, the metal member 10, and the spacer member 11. The cover member 1, the frame member 2, the coil 7, the fixed-side magnetic member 8, the base member 9, and the metal member 10 constitute a fixed-side member FB, and the coil 7, the fixed-side magnetic member 8, the base member 9, and the metal member 10 constitute a lower-side member LB. The cover member 1 and the base member 9 constitute a housing HS, the upper leaf spring 3 and the lower leaf spring 6 constitute a support member SB, the movable-side magnetic member 4, the optical element holding member 5, and the spacer member 11 constitute a movable-side member MB, and the movable-side magnetic member 4, the coil 7, the fixed-side magnetic member 8, and the metal member 10 constitute an electromagnetic mechanism DM.
The fixed-side member FB is a member fixedly arranged among members constituting the optical element driving device 100. The movable-side member MB is a member that is arranged to be movable with respect to the fixed-side member FB among the members constituting the optical element driving device 100. The support member SB is a member that is disposed between the fixed side member FB and the movable side member MB so that the movable side member MB can move with respect to the fixed side member FB, and supports the movable side member MB. The support member SB also functions as a biasing member that returns the movable-side member MB, which has moved by the electromagnetic mechanism DM, to its original position.
The cover member 1 is a member that covers other members constituting the optical element driving device 100. In the example shown in the drawing, the cover member 1 is manufactured by press working, drawing working, or the like, on a plate material made of a nonmagnetic metal such as austenitic stainless steel. Since the cover member 1 is made of a nonmagnetic metal, the electromagnetic mechanism DM or the like using electromagnetic force is not adversely affected in magnetism.
As shown in fig. 2, the cover member 1 has an outer shape defining a housing portion 1S. Specifically, the cover member 1 includes a substantially rectangular tubular outer peripheral wall portion 1A and a substantially rectangular annular flat plate-like top plate portion 1B continuous with an upper end (end on the Z1 side) of the outer peripheral wall portion 1A. A substantially rectangular opening 1K is formed in the center of the top plate portion 1B. The outer peripheral wall portion 1A includes first to fourth side plate portions 1A1 to 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 1 A3. As shown in fig. 1, the cover member 1 is bonded to the base member 9 by an adhesive, and constitutes a housing HS together with the base member 9.
The frame member 2 is configured to be capable of fixing the upper plate spring 3. In the illustrated example, the frame member 2 is formed by injection molding a synthetic resin such as a Liquid Crystal Polymer (LCP). Specifically, the frame member 2 includes four protruding portions 2U having a circular convex shape. The protruding portion 2U is formed to protrude upward (Z1 direction) from the bottom surfaces of recesses formed in the four corners of the upper surface of the frame member 2.
The upper plate spring 3 is configured to be able to connect the fixed side member FB (frame member 2) and the movable side member MB (optical element holding member 5). In the illustrated example, the upper plate spring 3 includes an annular inner portion 3I fixed to the optical element holding member 5, four outer portions 3E fixed to the frame member 2 as the fixed side member FB, and four elastic arm portions 3G located between the inner portion 3I and each of the four outer portions 3E. In the illustrated example, the upper plate spring 3 is configured to be secondarily rotationally symmetrical with respect to the optical axis of the lens body.
The four protruding portions 2U formed in the frame member 2 correspond to the four outer side portions 3E of the upper plate spring 3, respectively. The fixing between the frame member 2 and the upper plate spring 3 is achieved by heat staking the protruding portions 2U inserted into the through holes formed in the four outer side portions 3E, respectively. In fig. 2, the protruding portion 2U is shown in a state in which the tip end after heat staking is deformed. The same applies to the other figures.
The movable magnetic member 4 is one of the members constituting the electromagnetic mechanism DM, and the movable magnetic member 4 is supported by the optical element holding member 5 so as to be pulled downward by the fixed magnetic member 8 when the fixed magnetic member 8 is magnetized. In the illustrated example, the movable-side magnetic member 4 is attached to the optical element holding member 5 so as to be slidable in the up-down direction with respect to the optical element holding member 5. The movable-side magnetic member 4 is formed of a flat metal plate having magnetism.
In the illustrated example, the movable-side magnetic member 4 includes two protruding pieces 4F configured to face the fixed-side magnetic member 8 in the up-down direction, and an annular coupling portion 4V that couples the two protruding pieces 4F. The two projecting pieces 4F include a left projecting piece 4FL projecting leftward (Y1 direction) and a right projecting piece 4FR projecting rightward (Y2 direction).
Specifically, the movable-side magnetic member 4 includes: the first movable-side magnetic member 4A disposed at the highest position in the up-down direction, the second movable-side magnetic member 4B disposed at the lowest position in the up-down direction, and the third movable-side magnetic member 4C disposed between the first movable-side magnetic member 4A and the second movable-side magnetic member 4B in the up-down direction.
The first movable-side magnetic member 4A includes a first left protruding piece 4FL1, a first right protruding piece 4FR1, and a first coupling portion 4V1 coupling the first left protruding piece 4FL1 and the first right protruding piece 4FR 1. Similarly, the second movable-side magnetic member 4B includes a second left-side projecting piece 4FL2, a second right-side projecting piece 4FR2, and a second coupling portion 4V2 coupling the second left-side projecting piece 4FL2 and the second right-side projecting piece 4FR 2. Further, the third movable-side magnetic member 4C includes a third left-side projecting piece 4FL3, a third right-side projecting piece 4FR3, and a third coupling portion 4V3 coupling the third left-side projecting piece 4FL3 and the third right-side projecting piece 4FR 3. The first left projecting piece 4FL1, the second left projecting piece 4FL2, and the third left projecting piece 4FL3 constitute a left projecting piece 4FL, and the first right projecting piece 4FR1, the second right projecting piece 4FR2, and the third right projecting piece 4FR3 constitute a right projecting piece 4FR. The first left projecting piece 4FL1 and the first right projecting piece 4FR1 constitute a first projecting piece 4F1, the second left projecting piece 4FL2 and the second right projecting piece 4FR2 constitute a second projecting piece 4F2, and the third left projecting piece 4FL3 and the third right projecting piece 4FR3 constitute a third projecting piece 4F3.
Here, the positional relationship between the frame member 2 and the movable-side magnetic member 4 will be described with reference to fig. 3. Fig. 3 is a lower perspective view of the frame member 2. As shown in fig. 3, the frame member 2 includes two square convex stopper portions 2S protruding downward (Z2 direction) from an end surface on the image pickup device side (Z2 side). The stopper portion 2S includes a left stopper portion 2SL corresponding to the first left protruding piece 4FL1 (see fig. 2) of the movable-side magnetic member 4 and a right stopper portion 2SR corresponding to the first right protruding piece 4FR1 (see fig. 2) of the movable-side magnetic member 4. The stopper portion 2S is configured to be capable of coming into contact with the upper surface of the protruding piece 4F (the first left protruding piece 4FL1 and the first right protruding piece 4FR 1) of the movable-side magnetic member 4 in the initial state of the optical element driving device 100, thereby preventing further upward movement of the movable-side magnetic member 4. The initial state of the optical element driving device 100 means a state of the optical element driving device 100 when a current does not flow in the coil 7. In the initial state of the optical element driving device 100, the movable-side magnetic member 4 is not in contact with the fixed-side magnetic member 8.
The optical element holding member 5 is configured to be able to hold an optical element. In the illustrated example, the optical element holding member 5 is formed by injection molding a synthetic resin such as a Liquid Crystal Polymer (LCP). Specifically, the optical element holding member 5 includes a cylindrical portion 5C formed to extend in the up-down direction, and a pair of rotation restricting portions 5P protruding radially outward from the outer peripheral surface of the cylindrical portion 5C. An opening 5K into which the optical element is fitted is formed in the cylindrical portion 5C. The pair of rotation restriction portions 5P includes a left rotation restriction portion 5PL and a right rotation restriction portion 5PR. The optical element is fixed to the inner peripheral surface of the opening 5K, for example, by an adhesive. The rotation restricting portion 5P is a structural portion for restricting the relative rotation between the movable-side magnetic member 4 and the optical element holding member 5. In addition, the inner portion 3I of the upper plate spring 3 is fixed to the upper surface of the rotation restricting portion 5P by an adhesive.
The lower plate spring 6 is configured to connect the optical element holding member 5 and the base member 9. In the illustrated example, the lower plate spring 6 includes an annular inner portion 6I fixed to the optical element holding member 5 as the movable side member MB, four outer portions 6E fixed to the base member 9 as the fixed side member FB, and four elastic arm portions 6G located between the inner portion 6I and each of the four outer portions 6E. In the illustrated example, the lower plate spring 6 is configured to be secondarily rotationally symmetrical about the optical axis OA.
The lower member LB is a combination of members disposed below the movable member MB among the fixed member FB, and includes the coil 7, the fixed magnetic member 8, the base member 9, and the metal member 10.
Here, details of the lower member LB will be described with reference to fig. 4. Fig. 4 is an exploded perspective view of the lower member LB.
The coil 7 is fixed to a fixed-side magnetic member 8. In the example shown in fig. 4, the coil 7 is a wound coil including a left coil 7L and a right coil 7R.
The fixed-side magnetic member 8 is fixed to the upper surface of the base member 9. In the illustrated example, the fixed-side magnetic member 8 includes two core portions 8W configured to face the movable-side magnetic member 4 in the up-down direction, and a base portion 8C connecting the two core portions 8W. The fixed-side magnetic member 8 is formed by press working and bending working on one metal plate. The two core portions 8W include a left core portion 8WL extending upward from the left end portion of the base portion 8C toward the left protruding piece 4FL of the movable side magnetic member 4, and a right core portion 8WR extending upward from the right end portion of the base portion 8C toward the right protruding piece 4FR of the movable side magnetic member 4. A left coil 7L is disposed around the left core portion 8WL, and a right coil 7R is disposed around the right core portion 8WR. An opening 8K capable of accommodating the lower end portion of the optical element holding member 5 is formed in the central portion of the base portion 8C.
The base member 9 is configured to be capable of fixing the lower plate spring 6 and the fixed-side magnetic member 8. In the example shown in the figure, the base member 9 is formed by injection molding a synthetic resin such as a Liquid Crystal Polymer (LCP).
Specifically, as shown in fig. 4, the base member 9 is a member having a rectangular annular shape in a plan view with an opening 9K in the center, and the base member 9 includes four columnar portions 9P having square convex shapes protruding upward from four corners and four protruding portions 9Q having circular convex shapes protruding upward from the end surface on the imaging object side. The base member 9 includes four protruding portions 9T protruding upward from the upper end surfaces of the four columnar portions 9P, respectively.
The columnar portion 9P is a portion for supporting the lower plate spring 6. In the example of the drawing, the columnar portion 9P is configured to be capable of supporting the outer portion 6E of the lower plate spring 6 through the upper end face thereof.
The protruding portion 9Q is a portion for fixing the fixing-side magnetic member 8 to the base member 9. The fixing between the fixing-side magnetic member 8 and the base member 9 is achieved by heat staking four protruding portions 9Q inserted into four through holes 8H formed in the base portion 8C of the fixing-side magnetic member 8. In fig. 4, the protruding portion 9Q is shown in a state in which the tip end after heat staking is deformed. The same applies to the other figures.
The protruding portion 9T is a portion for fixing the lower plate spring 6 to the base member 9. The fixing between the lower leaf spring 6 and the base member 9 is achieved by heat staking a protruding portion 9T inserted into a through hole (see fig. 2) formed in the outer portion 6E of the lower leaf spring 6. In fig. 4, the protruding portion 9T is shown in a state in which the tip after heat staking is deformed. The same applies to the other drawings. The inner portion 6I of the lower plate spring 6 is fixed to the lower surface of the rotation restricting portion 5P of the optical element holding member 5 by an adhesive.
The metal member 10 functions as a conductive path for supplying current to the coil 7. In the illustrated example, the metal member 10 is embedded in the base member 9 by insert molding. Specifically, the metal part 10 includes a first metal part 10A, a second metal part 10B, and a third metal part 10C. The metal member 10 may be fixed to the surface of the base member 9.
The first metal member 10A includes a first terminal portion 10AT for connection with the outside and a first connection portion 10AP connected to one end of the right coil 7R via solder SD.
The second metal member 10B includes a second terminal portion 10BT used for connection with the outside and a second connection portion 10BP connected to the other end of the left coil 7L via solder SD.
The third metal member 10C includes a third right-side connection portion 10CPR connected to the other end of the right-side coil 7R via solder SD and a third left-side connection portion 10CPL connected to one end of the left-side coil 7L via solder SD.
With this configuration, the left coil 7L and the right coil 7R are connected in series. The coil 7 is configured such that the distal end portion of the left core portion 8WL and the distal end portion of the right core portion 8WR become different magnetic poles when a current flows. In the example shown in the figure, when the coil 7 is energized, the left coil 7L is disposed around the left core portion 8WL so that the current flow direction is counterclockwise in a plan view, the tip end portion of the left core portion 8WL is N-pole, and the right coil 7R is disposed around the right core portion 8WR so that the current flow direction is clockwise in a plan view, and the tip end portion of the right core portion 8WR is S-pole.
The spacer member 11 is a non-magnetic member configured to be able to prevent each of the plurality of movable-side magnetic members 4 from contacting each other. When a current is supplied to the coil 7 and the fixed-side magnetic member 8 is magnetized, if the first movable-side magnetic member 4A attracted to the fixed-side magnetic member 8 and the third movable-side magnetic member 4C not attracted to the fixed-side magnetic member 8 are in contact with each other, the first movable-side magnetic member 4A and the third movable-side magnetic member 4C are attracted to each other. In this case, it is difficult to separate the third movable-side magnetic member 4C from the first movable-side magnetic member 4A, to magnetically adhere the third movable-side magnetic member 4C to the fixed-side magnetic member 8, and further, it may be difficult to move the optical element holding member 5 further downward. Therefore, in the illustrated example, the optical element driving device 100 is configured such that the spacer member 11 is disposed between the two movable-side magnetic members 4. Specifically, the spacer 11 is manufactured by press working or the like on a plate material made of a nonmagnetic metal such as copper, and includes a first spacer 11A and a second spacer 11B. The spacer member 11 is attached to the optical element holding member 5 so as to be slidable in the up-down direction with respect to the optical element holding member 5.
The first spacer member 11A is arranged between the first movable-side magnetic member 4A and the third movable-side magnetic member 4C to prevent the first movable-side magnetic member 4A from contacting the third movable-side magnetic member 4C. Further, the second spacer member 11B is arranged between the third movable-side magnetic member 4C and the second movable-side magnetic member 4B to prevent the third movable-side magnetic member 4C from contacting the second movable-side magnetic member 4B.
The electromagnetic mechanism DM is a mechanism for electromagnetically moving the movable-side member MB supported by the support member SB in the optical axis direction. In the example shown in the drawing, the electromagnetic mechanism DM is constituted by a movable-side magnetic member 4, a coil 7, a fixed-side magnetic member 8, and a metal member 10. Specifically, the electromagnetic mechanism DM includes a pair of electromagnetic mechanisms (a first electromagnetic mechanism DM1 and a second electromagnetic mechanism DM 2) provided so as to face each other across the opening 5K of the optical element holding member 5.
As shown in fig. 2, the first electromagnetic mechanism DM1 includes a left protruding piece 4FL of the movable-side magnetic member 4 placed on the left side of the optical element holding member 5 and a left core portion 8WL of the fixed-side magnetic member 8 around which the left coil 7L is arranged. Similarly, as shown in fig. 2, the second electromagnetic mechanism DM2 includes a right protruding piece 4FR of the movable side magnetic member 4 disposed on the right side of the optical element holding member 5 and a right iron core portion 8WR of the fixed side magnetic member 8 around which the right coil 7R is disposed.
The optical element driving device 100 composed of the above-described various components is mounted on a main substrate (not shown), for example. The coil 7 is connected to a current supply source via a metal member 10 and a main board. When a current flows in the coil 7, the electromagnetic mechanism DM generates electromagnetic force along the optical axis direction.
When the optical element is a lens body, the optical element driving device 100 can switch between macro photography (japanese: camera) and normal photography by moving the lens body as the optical element in the optical axis direction by using electromagnetic force along the optical axis direction generated by the electromagnetic mechanism DM.
Next, details of the movable-side member MB will be described with reference to fig. 5 to 7. Fig. 5 is an exploded perspective view of the movable-side member MB and the fixed-side magnetic member 8, fig. 6 is a plan view of the movable-side member MB, and fig. 7 is a perspective view of the movable-side member MB. In fig. 6, the frame member 2 is shown with a broken line for clarity. In fig. 6 and 7, the movable-side magnetic member 4 is given a dense dot pattern, and the optical element holding member 5 is given a sparse dot pattern for clarity.
As shown in fig. 5, the optical element holding member 5 includes a cylindrical protruding portion 5F protruding radially outward from the outer peripheral surface of the cylindrical portion 5C.
The protruding portion 5F is configured to be capable of positioning the movable-side magnetic member 4 in the up-down direction. Specifically, the protruding portion 5F has a three-layered cylindrical shape, and includes a first protruding portion 5F1 configured to be able to position the first movable-side magnetic member 4A, a second protruding portion 5F2 configured to be able to position the second movable-side magnetic member 4B, and a third protruding portion 5F3 configured to be able to position the third movable-side magnetic member 4C.
More specifically, the first protruding portion 5F1 is configured to be able to support the lower surface of the first coupling portion 4V1 of the first movable-side magnetic member 4A by its upper surface. Likewise, the second protruding portion 5F2 is configured to be able to support the lower surface of the second coupling portion 4V2 of the second movable-side magnetic member 4B through its upper surface, and the third protruding portion 5F3 is configured to be able to support the lower surface of the third coupling portion 4V3 of the third movable-side magnetic member 4C through its upper surface.
In the illustrated example, the first spacer member 11A has the same size as the third coupling portion 4V3 of the third movable-side magnetic member 4C. Specifically, the inner dimension ID3, which is the inner diameter of the third movable-side magnetic member 4C, is the same as the inner dimension ID4, which is the inner diameter of the first spacer member 11A, and the outer dimension ED3 (see fig. 9A), which is the outer diameter of the third movable-side magnetic member 4C, is the same as the outer dimension (outer diameter) of the first spacer member 11A. Further, the second spacer member 11B has the same size as the second coupling portion 4V2 of the second movable-side magnetic member 4B. Specifically, the inner dimension ID2 of the second movable-side magnetic member 4B is the same as the inner dimension ID5 of the second spacer member 11B, and the outer dimension ED2 (see fig. 9A) of the second movable-side magnetic member 4B is the same as the outer dimension of the second spacer member 11B.
Further, the inner dimension ID1 of the first movable-side magnetic member 4A is smaller than the inner dimension ID3 of the third movable-side magnetic member 4C, and the inner dimension ID3 of the third movable-side magnetic member 4C is smaller than the inner dimension ID2 of the second movable-side magnetic member 4B.
The inner dimension ID1 of the first movable-side magnetic member 4A is substantially the same as the outer dimension ED0 (see fig. 9A) of the cylindrical portion 5C, the inner dimension ID3 of the third movable-side magnetic member 4C is substantially the same as the outer dimension ED11 (see fig. 9A) of the first protruding portion 5F1, and the inner dimension ID2 of the second movable-side magnetic member 4B is substantially the same as the outer dimension ED13 of the third protruding portion 5F 3.
The outer dimension ED1 (see fig. 9A) of the first movable-side magnetic member 4A is larger than the inner dimension ID3 of the third movable-side magnetic member 4C, and the outer dimension ED3 (see fig. 9A) of the third movable-side magnetic member 4C is larger than the inner dimension ID2 of the second movable-side magnetic member 4B.
As shown in fig. 9A, the outer dimension ED11 of the first protruding portion 5F1 is smaller than the outer dimension ED13 of the third protruding portion 5F3, and the outer dimension ED13 of the third protruding portion 5F3 is smaller than the outer dimension ED12 of the second protruding portion 5F 2. The outer dimension ED12 of the second protruding portion 5F2 is smaller than the outer dimension ED2 of the second movable-side magnetic member 4B, and is larger than the inner dimension ID2 (see fig. 5) of the second movable-side magnetic member 4B.
In the example of the figure, the three movable-side magnetic members 4 (the first movable-side magnetic member 4A, the second movable-side magnetic member 4B, and the third movable-side magnetic member 4C) are formed to have the same dimension in the up-down direction. Similarly, the two spacer members 11 (the first spacer member 11A and the second spacer member 11B) are formed to have the same dimension as each other in the up-down direction. The three movable-side magnetic members 4 are each formed to have a dimension in the up-down direction smaller than the dimension of the spacer member 11.
Further, as shown in fig. 5, the left core portion 8WL of the fixed-side magnetic member 8 is formed in a stepped shape so as to have three tip end portions having different positions (heights) in the up-down direction. Specifically, the three tip portions include a first left tip portion 8WL1, a third left tip portion 8WL3, and a second left tip portion 8WL2. The first left distal end portion 8WL1 is formed to protrude upward from the third left distal end portion 8WL3, and the third left distal end portion 8WL3 is formed to protrude upward from the second left distal end portion 8WL2.
Similarly, the right iron core portion 8WR of the fixed-side magnetic member 8 is formed in a stepped shape so as to have three distal end portions having different positions (heights) in the up-down direction. Specifically, the three tip portions include a first right tip portion 8WR1, a third right tip portion 8WR3, and a second right tip portion 8WR2. The first right distal end portion 8WR1 is formed to protrude upward from the third right distal end portion 8WR3, and the third right distal end portion 8WR3 is formed to protrude upward from the second right distal end portion 8WR2.
As shown in fig. 5, the first movable-side magnetic member 4A includes a first left protruding piece 4FL1 arranged to face the first left tip portion 8WL1 in the up-down direction and a first right protruding piece 4FR1 arranged to face the first right tip portion 8WR1 in the up-down direction. The third movable-side magnetic member 4C includes a third left protruding piece 4FL3 arranged to face the third left tip portion 8WL3 in the up-down direction and a third right protruding piece 4FR3 arranged to face the third right tip portion 8WR3 in the up-down direction. The second movable-side magnetic member 4B includes a second left protruding piece 4FL2 arranged to face the second left tip portion 8WL2 in the up-down direction and a second right protruding piece 4FR2 arranged to face the second right tip portion 8WR2 in the up-down direction.
With this configuration, when current flows in the left coil 7L, the three left projecting pieces 4FL (the first left projecting piece 4FL1, the third left projecting piece 4FL3, and the second left projecting piece 4FL 2) are pulled downward by and contact with the corresponding one of the three tip portions (the first left tip portion 8WL1, the third left tip portion 8WL3, and the second left tip portion 8WL 2), respectively. Similarly, when current flows in the right coil 7R, the three right protruding pieces 4FR (the first right protruding piece 4FR1, the third right protruding piece 4FR3, and the second right protruding piece 4FR 2) are pulled downward by and contact with the corresponding one of the three tip portions (the first right tip portion 8WR1, the third right tip portion 8WR3, and the second right tip portion 8WR 2), respectively.
As shown in fig. 7, the movable-side magnetic member 4 and the spacer member 11 are laminated in this order from above on the outer periphery of the optical element holding member 5, with the second movable-side magnetic member 4B, the second spacer member 11B, the third movable-side magnetic member 4C, the first spacer member 11A, and the first movable-side magnetic member 4A. In the example of the figure, the second movable-side magnetic member 4B, the second spacer member 11B, the third movable-side magnetic member 4C, the first spacer member 11A, and the first movable-side magnetic member 4A are capable of sliding in the up-down direction independently of each other in a state of being mounted on the outer periphery of the optical element holding member 5. However, the lower surface of the first spacer member 11A may be attached to the upper surface of the third movable-side magnetic member 4C by an adhesive or the like so as to be movable up and down together with the third movable-side magnetic member 4C. Similarly, the lower surface of the second spacer member 11B may be attached to the upper surface of the second movable-side magnetic member 4B by an adhesive or the like so as to be movable up and down together with the second movable-side magnetic member 4B.
As shown in fig. 5, the second movable-side magnetic member 4B, the second spacer member 11B, the third movable-side magnetic member 4C, the first spacer member 11A, and the first movable-side magnetic member 4A each have a pair of expansion portions in their respective openings. The pair of expansion portions is configured such that one (left) expansion portion engages with the left rotation restriction portion 5PL and the other (right) expansion portion engages with the right rotation restriction portion 5 PR. The second movable-side magnetic member 4B, the second spacer member 11B, the third movable-side magnetic member 4C, the first spacer member 11A, and the first movable-side magnetic member 4A are held slidably and relatively non-rotatably by the optical element holding member 5 by the respective expanded portions engaging with the rotation restricting portions 5P.
As shown in fig. 6, the frame member 2 is configured and arranged such that the stopper portion 2S faces the first protruding piece 4F1 of the first movable-side magnetic member 4A in the up-down direction. Specifically, the frame member 2 is configured and arranged such that the left stopper portion 2SL faces the first left projecting piece 4FL1, and the right stopper portion 2SR faces the first right projecting piece 4FR 1. With this configuration, when the optical element holding member 5 moves upward with respect to the frame member 2, the upper surface of the first protruding piece 4F1 of the first movable-side magnetic member 4A pushed upward by the first protruding portion 5F1 of the optical element holding member 5 can be brought into contact with the lower surface of the stopper portion 2S, and further upward movement of the optical element holding member 5 can be restricted.
Next, the states of the members when the optical element holding member 5 is displaced from the first position to the second position via the third position and the fourth position will be described with reference to fig. 8A to 8D and fig. 9A to 9D. In the illustrated example, the first position of the optical element holding member 5 is the position of the optical element holding member 5 when the optical element driving device 100 is in the initial state, that is, when the current does not flow in the coil 7. The second position of the optical element holding member 5 is the position of the optical element holding member 5 when the current flows in the coil 7. The third position and the fourth position are intermediate positions between the first position and the second position, and the third position is a position closer to the first position than the fourth position.
Fig. 8A to 8D are right side views of the optical element driving device 100 in a state where the cover member 1 is detached. Specifically, fig. 8A is a right side view of the optical element driving device 100 when the optical element holding member 5 is located at the first position, fig. 8B is a right side view of the optical element driving device 100 when the optical element holding member 5 is located at the third position, fig. 8C is a right side view of the optical element driving device 100 when the optical element holding member 5 is located at the fourth position, and fig. 8D is a right side view of the optical element driving device 100 when the optical element holding member 5 is located at the second position.
Fig. 9A to 9D are right side views of the movable-side magnetic member 4, the optical element holding member 5, and the fixed-side magnetic member 8. Specifically, fig. 9A is a right side view of the movable side magnetic member 4, the optical element holding member 5, and the fixed side magnetic member 8 when the optical element holding member 5 is located at the first position, fig. 9B is a right side view of the movable side magnetic member 4, the optical element holding member 5, and the fixed side magnetic member 8 when the optical element holding member 5 is located at the third position, fig. 9C is a right side view of the movable side magnetic member 4, the optical element holding member 5, and the fixed side magnetic member 8 when the optical element holding member 5 is located at the fourth position, and fig. 9D is a right side view of the movable side magnetic member 4, the optical element holding member 5, and the fixed side magnetic member 8 when the optical element holding member 5 is located at the second position.
In fig. 8A to 8D and fig. 9A to 9D, the movable-side magnetic member 4 is given a dense dot pattern, and the optical element holding member 5 is given a sparse dot pattern for clarity.
The following description with reference to fig. 8A to 8D and fig. 9A to 9D mainly relates to the relationship between the right protruding piece 4FR of the movable magnetic member 4 and the right iron core portion 8WR of the fixed magnetic member 8, but is equally applicable to the relationship between the left protruding piece 4FL of the movable magnetic member 4 and the left iron core portion 8WL of the fixed magnetic member 8.
In the state where the optical element holding member 5 is located at the first position, as shown in fig. 8A and 9A, the right protruding piece 4FR of the movable-side magnetic member 4 is not in contact with the right core portion 8WR of the fixed-side magnetic member 8.
Specifically, as shown in fig. 8A, a first gap G1, which is a gap between the first distal end portion 8W1 and the first movable-side magnetic member 4A in the up-down direction, is a value G1A, a second gap G2, which is a gap between the second distal end portion 8W2 and the second movable-side magnetic member 4B in the up-down direction, is a value G2A, and a third gap G3, which is a gap between the third distal end portion 8W3 and the third movable-side magnetic member 4C in the up-down direction, is a value G3A. As shown in fig. 9A, the fourth gap G4, which is the gap between the first movable-side magnetic member 4A and the third movable-side magnetic member 4C in the up-down direction, is a value G4A, which corresponds to the length (thickness) of the first gap member 11A in the up-down direction. Similarly, a fifth interval G5, which is an interval between the third movable-side magnetic member 4C and the second movable-side magnetic member 4B in the up-down direction, is a value G5A, which corresponds to the length (thickness) of the second spacer member 11B in the up-down direction.
In addition, in a state where the optical element holding member 5 is located at the first position, the smallest interval among the intervals between the magnetized magnetic member (fixed-side magnetic member 8) and the non-magnetized magnetic member (movable-side magnetic member 4) becomes the first interval G1. Therefore, in a state where the optical element holding member 5 is located at the first position, the first movable-side magnetic member 4A receives the maximum magnetic force (attractive force) from the magnetized magnetic member (the first distal end portion 8W 1).
As a result, the first movable-side magnetic member 4A is pulled to the first distal end portion 8W1, and moves downward together with the optical element holding member 5. Then, the optical element holding member 5 is moved from the first position to the third position.
In addition, in a state where the optical element holding member 5 is located at the third position, as shown in fig. 8B and 9B, the lower surface of the first right protruding piece 4FR1 of the right protruding pieces 4FR is in contact with the first right tip portion 8WR1 of the right core portions 8 WR.
Specifically, as shown in fig. 8B, the first interval G1 is a value G1B (zero) smaller than the ratio G1A, the second interval G2 is a value G2B smaller than the ratio G2A, and the third interval G3 is a value G3B smaller than the ratio G3A. As shown in fig. 9B, the fourth interval G4 is a value G4B identical to the value G4A, and the fifth interval G5 is a value G5B identical to the value G5A.
In addition, in a state where the optical element holding member 5 is located at the third position, the value G3B of the third interval G3 is smaller than the value G4B of the fourth interval G4. That is, the smallest interval among the intervals between the magnetized magnetic members (the fixed-side magnetic member 8 and the first movable-side magnetic member 4A attracted to the fixed-side magnetic member 8) and the non-magnetized magnetic members (the second movable-side magnetic member 4B and the third movable-side magnetic member 4C) becomes the third interval G3. Therefore, in a state where the optical element holding member 5 is located at the third position, the third movable-side magnetic member 4C receives the largest magnetic force (attractive force) from the magnetized magnetic member (the third distal end portion 8W 3). In the illustrated example, the value G3B of the third interval G3 is the same as the value G1A of the first interval G1 in a state where the optical element holding member 5 is located at the third position.
As a result, the third movable-side magnetic member 4C is pulled to the third distal end portion 8W3, and moves downward together with the optical element holding member 5. Then, the optical element holding member 5 is moved from the third position to the fourth position.
In addition, in a state where the optical element holding member 5 is located at the fourth position, as shown in fig. 8C and 9C, the lower surface of the third right protruding piece 4FR3 of the right protruding pieces 4FR is in contact with the third right tip portion 8WR3 of the right core portion 8 WR.
Specifically, as shown in fig. 8C, the first interval G1 is the same value G1C (zero) as the value G1B, the third interval G3 is a value G3C (zero) smaller than the value G3B, and the second interval G2 is a value G2C smaller than the value G2B. As shown in fig. 9C, the fourth gap G4 is a value G4C larger than the value G4B, and is larger than the length (thickness) of the first gap member 11A in the up-down direction. That is, when the optical element holding member 5 moves from the third position to the fourth position, the first spacer member 11A that has been in contact with the first movable-side magnetic member 4A moves downward together with the optical element holding member 5 away from the first movable-side magnetic member due to its own weight. The fifth interval G5 is the same value G5C as the value G5B.
In a state where the optical element holding member 5 is located at the fourth position, the value G2C of the second interval G2 is smaller than the value G5C of the fifth interval G5 (see fig. 9C). That is, the smallest interval among the intervals between the magnetized magnetic members (the fixed-side magnetic member 8 and the first movable-side magnetic member 4A and the third movable-side magnetic member 4C attracted to the fixed-side magnetic member 8) and the non-magnetized magnetic member (the second movable-side magnetic member 4B) becomes the second interval G2. Therefore, in a state where the optical element holding member 5 is located at the fourth position, the second movable-side magnetic member 4B receives the maximum magnetic force (attractive force) from the magnetized magnetic member (the second distal end portion 8W 2). In the illustrated example, the value G2C of the second interval G2 is the same as the value G1A of the first interval G1 in a state where the optical element holding member 5 is located at the fourth position.
As a result, the second movable-side magnetic member 4B is pulled to the second distal end portion 8W2, and moves downward together with the optical element holding member 5. Then, the optical element holding member 5 is moved from the fourth position to the second position.
In addition, in a state where the optical element holding member 5 is located at the second position, as shown in fig. 8D and 9D, the lower surface of the second right protruding piece 4FR2 of the right protruding pieces 4FR is in contact with the second right tip portion 8WR2 of the right core portion 8 WR.
Specifically, as shown in fig. 8D, the first interval G1 is the same value G1D (zero) as the value G1C, the third interval G3 is the same value G3D (zero) as the value G3C, and the second interval G2 is the value G2D (zero) smaller than the value G2C. As shown in fig. 9D, the fourth interval G4 is a value G4D equal to the value G4C, and the fifth interval G5 is a value G5D larger than the value G5C, and is larger than the length (thickness) of the second spacer 11B in the up-down direction. That is, when the optical element holding member 5 moves from the fourth position to the second position, the second spacer member 11B that has been in contact with the third movable-side magnetic member 4C moves away from the third movable-side magnetic member 4C by its own weight, and moves downward together with the optical element holding member 5.
When the supply of the current to the coil 7 is stopped, the optical element holding member 5 located at the second position is pushed upward by the restoring force of the support member SB (the upper leaf spring 3 and the lower leaf spring 6) serving as the urging member, and returns to the first position. This is because the attraction force acting between the movable-side magnetic member 4 and the fixed-side magnetic member 8 is lost.
In this way, the electromagnetic mechanism DM supplies current to the coil 7 to magnetize the core portion 8W of the fixed-side magnetic member 8, and thereby the optical element holding member 5 located at the first position can be moved to the second position by the electromagnetic force. Further, the electromagnetic mechanism DM stops the current supply to the coil 7 to stop the magnetization of the core portion 8W of the fixed-side magnetic member 8, and thereby the optical element holding member 5 located at the second position can be moved to the first position by the restoring force of the support member SB.
Accordingly, the optical element driving device 100 can move the optical element holding member 5 from the third position to the fourth position and further move the optical element holding member 5 from the fourth position to the second position by using the same magnitude of current as that used to move the optical element holding member 5 from the first position to the third position. That is, the optical element driving device 100 can move the optical element holding member 5 from the first position to the second position by using the same magnitude of current as that used to move the optical element holding member 5 from the first position to the third position.
As described above, as shown in fig. 2, the optical element driving device 100 includes: the optical element holding member 5 includes a fixed-side member FB, an optical element holding member 5 having an opening 5K through which an optical element can be arranged in the vertical direction, a support member SB for supporting the optical element holding member 5 so as to be movable with respect to the fixed-side member FB, a movable-side magnetic member 4 coupled to the optical element holding member 5 (so as to be slidably combined with respect to the optical element holding member 5), and an electromagnetic mechanism DM. The electromagnetic mechanism DM includes a fixed-side magnetic member 8 having an iron core portion 8W and a coil 7 wound around the iron core portion 8W, and attracts the movable-side magnetic member 4 toward the iron core portion 8W by electromagnetic force, thereby moving the optical element holding member 5 from the first position to the second position in the up-down direction. As shown in fig. 5, in the optical element driving device 100, the core portion 8W has a first distal end portion 8W1 and a second distal end portion 8W2. The movable-side magnetic member 4 includes: the first movable-side magnetic member 4A coupled to the optical element holding member 5 in a state of being opposed to the first distal end portion 8W1 in the up-down direction, and the second movable-side magnetic member 4B coupled to the optical element holding member 5 in a state of being opposed to the second distal end portion 8W2 in the up-down direction. When the optical element holding member 5 is positioned at the first position, a value G1A (see fig. 8A) of the first gap G1 between the first distal end portion 8W1 and the first movable-side magnetic member 4A in the up-down direction is smaller than a value G2A (see fig. 8A) of the second gap G2 between the second distal end portion 8W2 and the second movable-side magnetic member 4B in the up-down direction. The value G1A (see fig. 8A) of the first interval G1 when the optical element holding member 5 is located at the first position is larger than the value G1D (see fig. 8D) of the first interval G1 when the optical element holding member 5 is located at the second position. The value G2A (see fig. 8A) of the second interval G2 when the optical element holding member 5 is positioned at the first position is larger than the value G2D (see fig. 8D) of the second interval G2 when the optical element holding member 5 is positioned at the second position.
This configuration brings about the following effects: when the optical element holding member 5 is located at the first position, that is, in the initial state of the optical element driving device 100 in which the coil 7 is not energized, the first interval G1 can be set to a value G1A smaller than a desired movement amount of the optical element holding member 5. In other words, this configuration has an effect that the amount of movement of the optical element holding member 5 can be increased without excessively increasing the current flowing through the coil 7. In the illustrated example, the desired movement amount of the optical element holding member 5 is the sum of the values G1A, G3B, and G2C.
In addition, in the optical element driving device 100, as shown in fig. 4, the first tip end portion 8W1 and the second tip end portion 8W2 of the core portion 8W may be arranged to be different from each other in position in the up-down direction. In the illustrated example, the first distal end portion 8W1 is disposed at a position higher than the second distal end portion 8W 2.
For example, as shown in fig. 8D and 9D, this configuration has an effect that the positions of the first movable-side magnetic member 4A and the second movable-side magnetic member 4B in the up-down direction when the optical element holding member 5 is located at the second position can be easily specified.
In the optical element driving device 100, the first movable-side magnetic member 4A and the second movable-side magnetic member 4B may be formed in a ring shape so as to surround the outer periphery of the optical element holding member 5, as shown in fig. 5 to 7, respectively. In this case, the optical element holding member 5 may be inserted into the openings of the first movable-side magnetic member 4A and the second movable-side magnetic member 4B in a state where relative rotation with respect to the first movable-side magnetic member 4A and the second movable-side magnetic member 4B is not possible.
This configuration has the effect of stabilizing the movement (sliding in the up-down direction) of each of the first movable-side magnetic member 4A and the second movable-side magnetic member 4B with respect to the optical element holding member 5.
In the optical element driving device 100, the first movable-side magnetic member 4A and the second movable-side magnetic member 4B may have shapes including portions along the outer periphery of the optical element holding member 5, as shown in fig. 5, respectively. The optical element holding member 5 may have a first protruding portion 5F1 and a second protruding portion 5F2 on the outer periphery thereof. Further, the second protruding portion 5F2 may be formed at a position different from the first protruding portion 5F1 in the up-down direction. In this case, in the direction perpendicular to the up-down direction (X-axis direction), the outer dimension ED11 (see fig. 9A) of the first protruding portion 5F1 is larger than the inner dimension ID1 (see fig. 5) of the first movable-side magnetic member 4A, and the outer dimension ED12 (see fig. 9A) of the second protruding portion 5F2 is larger than the inner dimension ID2 (see fig. 5) of the second movable-side magnetic member 4B. Further, the position of the first movable-side magnetic member 4A and the position of the second movable-side magnetic member 4B in the up-down direction are different from each other. In the illustrated example, the first movable-side magnetic member 4A is located at a higher position than the second movable-side magnetic member 4B.
This configuration has an effect that the first movable-side magnetic member 4A and the second movable-side magnetic member 4B can be easily assembled to the optical element holding member 5.
In the optical element driving device 100, the first movable-side magnetic member 4A and the second movable-side magnetic member 4B may be formed in a ring shape so as to surround the outer periphery of the optical element holding member 5, as shown in fig. 5. In this case, the size of the opening of the first movable-side magnetic member 4A, which is one of the first movable-side magnetic member 4A located on the side (upper side) away from the coil 7, through which the optical element holding member 5 is inserted is typically smaller than the size of the opening of the second movable-side magnetic member 4B, which is the other of the first movable-side magnetic member 4A and the second movable-side magnetic member 4B located on the side (lower side) close to the coil 7, through which the optical element holding member 5 is inserted.
This configuration has an effect that the first movable-side magnetic member 4A and the second movable-side magnetic member 4B can be assembled with respect to the optical element holding member 5 more easily.
In the optical element driving device 100, as shown in fig. 8A, the fixed-side member FB (frame member 2) may have a stopper portion 2S that restricts the position of the first movable-side magnetic member 4A when the optical element holding member 5 is located at the first position.
This configuration brings about the following effects: even if the first movable-side magnetic member 4A can move in the up-down direction, the position of the first movable-side magnetic member 4A when the optical element driving device 100 is in the initial state is restricted by the stopper portion 2S, and therefore, the first gap G1 of an appropriate size can be maintained regardless of the posture of the optical element driving device 100.
In the optical element driving device 100, as shown in fig. 2, the electromagnetic mechanism DM may include a pair of electromagnetic mechanisms (a first electromagnetic mechanism DM1 and a second electromagnetic mechanism DM 2) provided across the opening 5K of the optical element holding member 5. One of the first solenoid DM1 and the second solenoid DM2 may be omitted.
The configuration including a pair of electromagnetic mechanisms has an effect of stabilizing the movement of the optical element holding member 5 in the up-down direction.
In the optical element driving device 100, the fixed-side magnetic member 8 may be formed of a metal plate having magnetism, and as shown in fig. 4, may have a left-side core portion 8WL as a first core portion, a right-side core portion 8WR as a second core portion, and a base portion 8C connecting the left-side core portion 8WL and the right-side core portion 8 WR. In this case, the left core portion 8WL extends from the left end portion of the base portion 8C to the upper side on the movable side magnetic member 4 side, and the right core portion 8WR extends from the right end portion of the base portion 8C to the upper side on the movable side magnetic member 4 side. Further, the left coil 7L as a first coil wound around the left core portion 8WL and the right coil 7R as a second coil wound around the right core portion 8WR may be connected in series. The fixed-side magnetic member 8 may be configured such that when current flows through the left coil 7L and the right coil 7R, the distal end portion of the left core portion 8WL and the distal end portion of the right core portion 8WR become different magnetic poles from each other.
This configuration brings about the following effects: the magnetic force (attractive force) acting between the movable magnetic member 4 and the fixed magnetic member 8 can be enhanced as compared with the case where the distal end portion of the left iron core portion 8WL and the distal end portion of the right iron core portion 8WR have the same magnetic pole.
In the optical element driving device 100, the first movable-side magnetic member 4A and the second movable-side magnetic member 4B may be formed of a metal plate having magnetism. Further, a spacer member 11 formed of a nonmagnetic member may be disposed between the first movable-side magnetic member 4A and the second movable-side magnetic member 4B in the up-down direction. In addition, the spacer 11 may be omitted.
The constitution including the spacer member 11 brings about the following effects: regardless of the posture of optical element driving device 100, when first movable-side magnetic member 4A moves toward first distal end portion 8W1, second movable-side magnetic member 4B moves toward second distal end portion 8W2 together with spacer member 11, thereby reducing second gap G2.
Further, in the optical element driving device 100, as shown in fig. 6, the first movable-side magnetic member 4A may have a first protruding piece 4F1 protruding outward away from the opening along a plane (XY plane) perpendicular to the up-down direction, and the second movable-side magnetic member 4B may have a second protruding piece 4F2 protruding outward away from the opening along a plane (XY plane) perpendicular to the up-down direction and arranged at a position different from the first protruding piece 4F1 in a plan view along the up-down direction. In this case, the first protruding piece 4F1 and the first distal end portion 8W1 (see fig. 5) may face each other, and the second protruding piece 4F2 and the second distal end portion 8W2 (see fig. 5) may face each other.
This configuration brings about the following effects: the first protruding piece 4F1 can be prevented from interfering with the contact between the second protruding piece 4F2 and the second tip end portion 8W2 when the optical element holding member 5 moves in the up-down direction, and the second protruding piece 4F2 can be prevented from interfering with the contact between the first protruding piece 4F1 and the first tip end portion 8W 1.
In the optical element driving device 100, the electromagnetic mechanism DM may be configured to move the optical element holding member 5 from the first position to the second position via the third position in the up-down direction. In this case, as shown in fig. 5, the core portion 8W may further have a third tip portion 8W3. The movable-side magnetic member 4 may further include a third movable-side magnetic member 4C coupled to the optical element holding member 5 in a state of being opposed to the third distal end portion 8W3 in the up-down direction. When the optical element holding member 5 is positioned at the first position, a value G3A (see fig. 8A) of a third gap G3, which is a gap between the third distal end portion 8W3 and the third movable-side magnetic member 4C in the up-down direction, is larger than a value G1A (see fig. 8A) of the first gap G1 and smaller than a value G2A (see fig. 8A) of the second gap G2. The value G3A (see fig. 8A) of the third interval G3 when the optical element holding member 5 is positioned at the first position is larger than the value G3D (see fig. 8D) of the third interval G3 when the optical element holding member 5 is positioned at the second position, and is larger than the value G3B (see fig. 8B) of the third interval G3 when the optical element holding member 5 is positioned at the third position.
In the optical element driving device 100, when the coil 7 is energized, the core portion 8W may sequentially attract the movable-side magnetic members 4 in the order of the first movable-side magnetic member 4A, the third movable-side magnetic member 4C, and the second movable-side magnetic member 4B.
This configuration has an effect that the current flowing through the coil 7 can be further reduced as compared with the case where the core portion 8W has a second-order configuration. The core portion 8W may have a tip portion of four or more steps. This configuration has an effect that the current flowing through the coil 7 can be further reduced as compared with the case where the core portion 8W has a three-step configuration.
The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiment. The above-described embodiments may be variously modified, substituted, or the like without departing from the scope of the present invention. Further, the features described with reference to the above embodiments may be appropriately combined as long as they are not technically contradictory.
For example, in the above embodiment, the protruding portion 5F of the optical element holding member 5 is configured to have the first protruding portion 5F1, the second protruding portion 5F2, and the third protruding portion 5F3, but the first protruding portion 5F1 and the third protruding portion 5F3 may be omitted. In this case, the first coupling portion 4V1 of the first movable-side magnetic member 4A, the first spacer member 11A, the third coupling portion 4V3 of the third movable-side magnetic member 4C, the second spacer member 11B, and the second coupling portion 4V2 of the second movable-side magnetic member 4B may be configured such that the inner dimension (inner diameter) and the outer dimension (outer diameter) are equal to each other, respectively. Further, the first spacer member 11A and the second spacer member 11B may be the same component.

Claims (12)

1. An optical element driving device is characterized by comprising:
a fixed side member;
an optical element holding member having an opening through which an optical element can be arranged in the vertical direction;
a support member that supports the optical element holding member so as to be movable with respect to the fixed-side member;
a movable-side magnetic member coupled to the optical element holding member; and
an electromagnetic mechanism including a fixed-side magnetic member having an iron core portion and a coil wound around the iron core portion, wherein the movable-side magnetic member is attracted toward the iron core portion by electromagnetic force, whereby the optical element holding member is moved from a first position to a second position in the up-down direction,
the core part has a first tip part and a second tip part,
the movable-side magnetic member includes: a first movable-side magnetic member coupled to the optical element holding member in a state of being opposed to the first distal end portion in the up-down direction; and a second movable-side magnetic member coupled to the optical element holding member in a state of being opposed to the second distal end portion in the up-down direction,
when the optical element holding member is positioned at the first position, a first interval between the first distal end portion and the first movable-side magnetic member in the up-down direction is smaller than a second interval between the second distal end portion and the second movable-side magnetic member in the up-down direction,
The first interval when the optical element holding member is positioned at the first position is larger than the first interval when the optical element holding member is positioned at the second position,
the second interval when the optical element holding member is positioned at the first position is larger than the second interval when the optical element holding member is positioned at the second position.
2. The optical element driving device according to claim 1, wherein,
the first distal end portion and the second distal end portion of the core portion are disposed at positions different from each other in the up-down direction.
3. The optical element driving device according to claim 1 or 2, wherein,
the first movable-side magnetic member and the second movable-side magnetic member are each formed in a ring shape so as to surround the outer periphery of the optical element holding member,
the optical element holding member is inserted into the openings of the first movable magnetic member and the second movable magnetic member in a state in which the optical element holding member is not rotatable relative to the first movable magnetic member and the second movable magnetic member, respectively.
4. The optical element driving device according to any one of claim 1 to claim 3, wherein,
the first movable-side magnetic member and the second movable-side magnetic member each have a shape including a portion along an outer periphery of the optical element holding member,
the optical element holding member has a first protrusion and a second protrusion on an outer periphery thereof, the second protrusion being located at a position different from the first protrusion in the up-down direction,
the first protrusion has an outer dimension larger than an inner dimension of the first movable-side magnetic member in a direction perpendicular to the up-down direction, the second protrusion has an outer dimension larger than an inner dimension of the second movable-side magnetic member,
in the vertical direction, the position of the first movable-side magnetic member and the position of the second movable-side magnetic member are different from each other.
5. The optical element driving device according to claim 4, wherein,
the first movable-side magnetic member and the second movable-side magnetic member are each formed in a ring shape so as to surround the outer periphery of the optical element holding member,
the opening of the first movable-side magnetic member and the second movable-side magnetic member, which is located on one side away from the coil, through which the optical element holding member is inserted, is smaller than the opening of the first movable-side magnetic member and the second movable-side magnetic member, which is located on the other side closer to the coil, through which the optical element holding member is inserted.
6. The optical element driving device according to any one of claims 1 to 5, wherein,
the fixed-side member has a stopper portion that restricts a position of the first movable-side magnetic member when the optical element holding member is located at the first position.
7. The optical element driving device according to any one of claims 1 to 6, wherein,
the electromagnetic mechanism includes a first electromagnetic mechanism and a second electromagnetic mechanism provided to sandwich the opening of the optical element holding member.
8. The optical element driving device according to claim 7, wherein,
the fixed-side magnetic member is formed of a metal plate having magnetic properties, and has a first core portion, a second core portion, and a base portion connecting the first core portion and the second core portion,
the first core portion extends from the base portion toward the movable-side magnetic member,
the second core portion extends from the base portion toward the movable-side magnetic member,
a first coil wound around the first core portion and a second coil wound around the second core portion are connected in series,
the fixed-side magnetic member is configured to: when a current flows through the first coil and the second coil, the distal end portion of the first core portion and the distal end portion of the second core portion become different magnetic poles from each other.
9. The optical element driving device according to any one of claims 1 to 8, wherein,
the first movable-side magnetic member and the second movable-side magnetic member are each formed of a metal plate having magnetism, and a spacer member formed of a nonmagnetic member is disposed between the first movable-side magnetic member and the second movable-side magnetic member in the up-down direction.
10. The optical element driving device according to any one of claims 1 to 9, wherein,
the first movable-side magnetic member has a first protruding piece protruding outwardly away from the opening along a plane perpendicular to the up-down direction,
the second movable-side magnetic member has a second protruding piece that protrudes outward away from the opening along a surface perpendicular to the up-down direction and is arranged at a position different from the first protruding piece in a plan view along the up-down direction,
in the vertical direction, the first protruding piece faces the first distal end portion, and the second protruding piece faces the second distal end portion.
11. The optical element driving device according to any one of claims 1 to 10, wherein,
The electromagnetic mechanism is configured to move the optical element holding member from the first position to the second position via a third position in the up-down direction,
the core portion further has a third distal end portion,
the movable-side magnetic member further includes a third movable-side magnetic member coupled to the optical element holding member in a state of being opposed to the third distal end portion in the up-down direction,
when the optical element holding member is positioned at the first position, a third interval between the third distal end portion and the third movable-side magnetic member in the up-down direction is larger than the first interval and smaller than the second interval,
the third interval when the optical element holding member is positioned at the first position is larger than the third interval when the optical element holding member is positioned at the second position, and is larger than the third interval when the optical element holding member is positioned at the third position.
12. The optical element driving device according to claim 11, wherein,
when the coil is energized, the iron core portion sequentially adsorbs the first movable-side magnetic member, the third movable-side magnetic member, and the second movable-side magnetic member.
CN202310302153.0A 2022-03-28 2023-03-27 Optical element driving device Pending CN116819713A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022052408A JP2023145115A (en) 2022-03-28 2022-03-28 Optical element driving device
JP2022-052408 2022-03-28

Publications (1)

Publication Number Publication Date
CN116819713A true CN116819713A (en) 2023-09-29

Family

ID=88115041

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310302153.0A Pending CN116819713A (en) 2022-03-28 2023-03-27 Optical element driving device

Country Status (2)

Country Link
JP (1) JP2023145115A (en)
CN (1) CN116819713A (en)

Also Published As

Publication number Publication date
JP2023145115A (en) 2023-10-11

Similar Documents

Publication Publication Date Title
CN211698335U (en) Optical assembly driving mechanism
JP5513834B2 (en) Lens drive device
US7843656B2 (en) Lens actuator
CN104898347A (en) Camera lens module
JP2012505433A (en) Compound drive lens actuator
KR20110066879A (en) Lens actuator
JP6273491B2 (en) Lens driving device, camera device, and electronic device
WO2008128407A1 (en) Actuator for linear motion and tilting motion
KR100833152B1 (en) Actuator structure and actuator block and electronic device using the same
EP1124226B1 (en) Lens drive device and method for manufacturing the same
US11774704B2 (en) Driving mechanism
US11506859B2 (en) Lens module
CN104253521A (en) Actuator
JP4774875B2 (en) Camera actuator
CN116819713A (en) Optical element driving device
JP5827923B2 (en) Lens drive magnetic circuit
JP2013122557A (en) Camera module
KR20150080730A (en) Camera module
JP5939907B2 (en) Lens drive device adjustment method
US20210075941A1 (en) Lens Driving Device, Camera Device and Electronic Apparatus
JP5939802B2 (en) Lens driving device and method of manufacturing lens driving device
CN107085275B (en) Lens driving device
CN112987450B (en) Optical member driving device, camera device and electronic apparatus
CN213957720U (en) Driving device, optical component driving device, and electronic apparatus
JP7123026B2 (en) Optical member driving device, camera device and electronic equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination