CN110140083B - Lens driving device - Google Patents
Lens driving device Download PDFInfo
- Publication number
- CN110140083B CN110140083B CN201780080946.5A CN201780080946A CN110140083B CN 110140083 B CN110140083 B CN 110140083B CN 201780080946 A CN201780080946 A CN 201780080946A CN 110140083 B CN110140083 B CN 110140083B
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- Prior art keywords
- base member
- conductive
- coil
- conductive pattern
- driving device
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- 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
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
Abstract
The first metal sheet, the second metal sheet, and the third metal sheet are embedded in the base member by insert molding. A plurality of conductive patterns are formed on the base member from the first surface to the second surface, and the conductive patterns are respectively in conduction with the conduction parts of the first metal sheet.
Description
Technical Field
The present invention relates to a lens driving device in which a lens holding member is moved by applying a current to a coil from an external terminal portion formed of a metal sheet embedded in a base member.
Background
Patent document 1 describes an invention relating to a lens driving device.
In the lens driving device described in patent document 1, 4 suspension wires are fixed to a lower case, and an autofocus actuator is supported by the suspension wires so as to be movable in a direction intersecting the optical axis of the lens.
In an actuator for automatic focusing, a first coil is wound around a lens holder that holds a lens body. The lens holder is provided inside an outer yoke having a magnet, and is supported by an upper plate spring and a lower plate spring so as to be movable in the optical axis direction inside the outer yoke.
An FPC (flexible printed circuit) is stacked on the lower case, and a magnetism detection element is fixed to the lower surface of the FPC. A second coil holding member is superimposed on the FPC, and a second coil, which is a printed coil, is provided on the second coil holding member. The FPC is provided with an extension portion, and the second coil and the magnetism detection element are wired via a winding pattern of the FPC. Further, current is also supplied from the winding pattern of the FPC to the first coil via the suspension wire and the upper plate spring.
In this lens driving device, the following so-called camera shake correction is performed: the magnetic force detection element detects the movement of the autofocus actuator supported by the suspension wire in the direction intersecting the optical axis, and applies a current to the second coil to cancel the movement. Then, the lens holder is driven in the optical axis direction by the current applied to the first coil, and focus correction is performed.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2014-85624
Disclosure of Invention
Problems to be solved by the invention
In such a lens driving device, it is necessary to provide a plurality of wiring paths, such as a wiring path to the second coil, a wiring path to the magnetism detection element, and a wiring path to the first coil. In patent document 1, a plurality of wiring paths can be formed by providing an FPC in a superposed manner on a lower case.
However, since the FPC is an expensive component, there is a problem that the manufacturing cost increases by providing the FPC. In particular, in patent document 1, since the suspension wire that is a part of the wiring path to the first coil is soldered to the FPC, a polyimide resin having heat resistance needs to be used as a material of the FPC, which further increases material cost.
In addition, in the assembly work, a process of sequentially stacking the FPC and the second coil holding member on the lower case is also required, and thus, the number of steps is increased, which also increases the manufacturing cost.
The present invention has been made to solve the above conventional problems, and an object thereof is to provide a lens driving device capable of realizing a plurality of wiring paths to a coil, a magnetism detection element, or the like with a small number of components.
Means for solving the problems
The present invention is a lens driving device, comprising: a base member; a lens holding member capable of holding a lens body; and a driving mechanism for moving the lens holding member, wherein the driving mechanism is configured to have a magnet and a coil, and the lens driving device is characterized in that,
the base member is made of an insulating material, a first metal piece is embedded in the base member, an external terminal portion and a conductive portion are formed in the first metal piece,
the external terminal portion is exposed from the base member to the outside,
a conductive pattern is formed on a surface of the base member, the conductive pattern is electrically connected to the conductive portion, and the coil is electrically connected to the conductive pattern.
In the lens driving device according to the present invention, it is preferable that the surface of the base member has a first surface and a second surface located higher than the first surface,
the conductive portion of the first metal sheet is connected to the conductive pattern formed from the first surface to the second surface.
In the lens driving device according to the present invention, it is preferable that an inclined surface is formed between the first surface and the second surface, and the conductive pattern is formed from the first surface to the second surface via the inclined surface.
In this case, the rising angle of the slope from the first surface is preferably 45 degrees or less.
In the lens driving device according to the present invention, the movable portion on which the lens holding member is mounted is supported by the base member via an elastic support member, the magnet is mounted on the movable portion, an insulating substrate having the coil facing the magnet is stacked on the base member,
the conductive pattern is joined to a conductive connection portion formed on the insulating substrate, and the conductive pattern is electrically connected to the coil via a wiring pattern of the insulating substrate.
Alternatively, in the lens driving device according to the present invention, the movable portion on which the lens holding member is mounted is supported by the base member via an elastic support member, the magnet is mounted on the movable portion, and an insulating substrate having the coil facing the magnet and a magnetism detecting element facing the magnet is stacked on the base member,
the conductive pattern formed on the second surface is joined to a conductive connection portion formed on the insulating substrate, a part of the conductive pattern is electrically connected to the coil via a wiring pattern of the insulating substrate, and the other part of the conductive pattern is electrically connected to the magnetic force detecting element via a wiring pattern of the insulating substrate.
In the lens driving device according to the present invention, it is preferable that the magnetic force detecting element is formed to face the first surface of the base member.
In the lens driving device according to the present invention, the insulating substrate may be a laminated substrate in which a plurality of insulating sheets are laminated, and the coil may be formed by a coil conductor formed in each of the insulating sheets.
In the lens driving device according to the present invention, the insulating substrate may be divided into a plurality of parts, and relay conductive parts provided on the insulating substrates may be electrically connected to each other via a relay conductive pattern provided on the surface of the base member.
In the lens driving device according to the present invention, the movable portion on which the lens holding member is mounted is supported by the base member via a suspension wire, the magnet is mounted on the movable portion, the coil is provided on the base member side,
a second metal piece for supporting the suspension wire is embedded in the base member, the second metal piece is formed of the same metal plate as the first metal piece, and the second metal piece is positioned on the same level surface as the conductive portion of the first metal piece.
Effects of the invention
In the lens driving device according to the present invention, the metal sheet embedded in the base member and the conductive pattern formed on the surface of the base member are combined to form the wiring path. Therefore, a plurality of wiring paths can be efficiently configured without using an FPC or the like.
Further, by lowering the first surface of the base member, connecting the conductive pattern and the metal piece to the first surface, and electrically connecting the conductive pattern formed on the second surface located at the high position to the insulating substrate or the like, it is possible to prevent the conductive portion of the metal piece exposed from the first surface of the base member from coming into contact with the insulating substrate or the like.
Drawings
Fig. 1 is a perspective view showing a lens driving device according to an embodiment of the present invention from above.
Fig. 2 is a perspective view showing the lens driving device shown in fig. 1 with the cover removed.
Fig. 3 is an exploded perspective view showing the lens driving device with the cover removed, with the components exploded.
Fig. 4 is an exploded perspective view showing a base member, a suspension wire, and an insulating substrate having a coil of the lens driving device.
Fig. 5 is an exploded perspective view showing a positional relationship between the first metal piece and the second metal piece embedded in the base member and the conductive pattern on the surface of the base member.
Fig. 6 is a sectional view of the base structure including the base member shown in fig. 4 cut along line VI-VI.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.
The lens driving device 1 shown in fig. 1 is mounted on a mobile phone, a mobile information terminal device, or the like together with an image pickup device. Although omitted in the following embodiments, a lens body (lens barrel) facing the image pickup device can be mounted on the lens holder 31 of the lens driving device 1. The lens holder 31 is driven in the optical axis direction of the lens body to perform automatic focus adjustment, and the lens holder 31 is driven in the direction intersecting the optical axis to perform camera shake correction. The lens holder 31 is a lens holding member.
In each figure, the Z1 direction is above the lens drive device 1, and the Z2 direction is below the lens drive device 1. The Z1 direction is the front of the object to be imaged by the imaging element, and the Z2 direction is the rear of the imaging element.
Fig. 1 shows the overall structure of the lens driving device 1, fig. 2 shows the lens driving device 1 with the cover 2 removed, and fig. 3 shows the lens driving device 1 with the main parts broken away. In each figure, a center line O of the lens driving device 1 is shown. When a lens body is mounted on the lens driving device 1, the center line O coincides with the optical axis of the lens body (lens). The Z1-Z2 direction is a direction along the optical axis.
As shown in fig. 3, the lens driving device 1 includes a base structure portion 10. The base structure portion 10 is provided with a base member 11 made of synthetic resin. Fig. 4 to 6 show the detailed structure of the base member 11. The base member 11 is embedded with first metal pieces 12 and 13, second metal pieces 14A and 14B, and third metal pieces 19a and 19B, which are formed of a metal plate having conductivity such as a phosphor bronze plate. As shown in fig. 5, the first metal pieces 12 and 13 are divided into a plurality of pieces, and the second metal pieces 14A and 14B are divided into 2 pieces. Third metal sheets 19a, 19b are also provided at 2.
The first metal sheets 12, 13, the second metal sheets 14A, 14B, and the third metal sheets 19a, 19B are cut out from 1 metal sheet, and the metal sheets 12, 13, 14A, 14B, 19a, 19B are integrated with the base member 11 by a so-called insert molding method. The details of the structures of the first metal sheets 12, 13, the second metal sheets 14A, 14B, and the third metal sheets 19a, 19B will be described later.
As shown in fig. 5, flat portions 14A parallel to an X-Y plane orthogonal to the optical axis are formed in the second metal pieces 14A, 14B, and a suspension fixing portion 14B is formed at a total of 4 at the end portions of the flat portions 14A. As shown in fig. 4, the suspension fixing portions 14b are exposed from the corners 4 of the rectangular base member 11. In the lens driving device 1, 4 suspension wires 8 are provided as elastic support members. The base end portion (lower end portion) of each suspension wire 8 is fixed to the suspension fixing portion 14b by brazing. The movable unit (movable portion) 30 is supported by the upper end portion 8a of the suspension wire 8 so as to be movable in a direction (orthogonal direction) intersecting the Z axis along the optical axis.
The suspension wire 8 is formed of a metal material having electrical conductivity and excellent elasticity, for example, a copper alloy. The suspension wire 8 has a circular cross section and linearly extends along the optical axis.
As shown in fig. 3, the movable unit (movable portion) 30 has a movable base 32. The movable base 32 is formed of a synthetic resin material.
As shown in fig. 3, movable base 32 has a rectangular shape (substantially square shape) in plan view, and magnets 33X and 33X are fixed to side portions facing in the X direction, and magnets 33Y and 33Y are fixed to side portions facing in the Y direction. Magnets 33x and 33x are arranged parallel to each other, and magnets 33y and 33y are arranged parallel to each other.
The inner surfaces of the magnets 33x, 33y, and 33y facing the center line O are excited to have the same magnetic pole. The outer surfaces of the magnets 33x, 33y, and 33y are excited to have the same magnetic polarity, and the inner surfaces and the outer surfaces of the magnets have opposite magnetic polarities. For example, the inner surface is an N-pole and the outer surface is an S-pole.
In the movable unit 30, the lens holder 31 is disposed inside a frame-shaped movable base 32. The lens holder 31 is made of synthetic resin, and is formed in a cylindrical shape with a circular holding hole 31a penetrating in the vertical direction (Z direction) formed in the center portion thereof. The lens for image pickup is held by the lens barrel, and the lens barrel (lens body) holding the lens can be fitted into the holding hole 31 a. Therefore, although a screw groove (not shown) for attaching the lens body is provided in the holding hole 31a of the lens holder 31, the lens body may be held by adhesion to the lens holder 31. In addition, in the embodiment, illustration of the lens and the lens barrel is omitted.
The center axis of the lens holder 31 coincides with the optical axis of the lens (lens body) held by the holder and coincides with the center line O.
As shown in fig. 2 and 3, first leaf springs 34A and 34B divided into 2 pieces are fixed to the upper side of the movable base 32. The first plate springs 34A and 34B are formed of a conductive elastic metal plate such as a copper alloy or a phosphor bronze plate. Each of the first leaf springs 34A and 34B is integrally formed with an outer fixing portion 34A, an inner fixing portion 34B, and an elastic deformation portion 34c connecting the outer fixing portion 34A and the inner fixing portion 34B.
The outer fixing portions 34A of the first leaf springs 34A and 34B are fixed to the upper surface of the movable base 32 by heat caulking, adhesion, or the like. A synthetic resin pressing member 35 is provided on the first leaf springs 34A and 34B. The pressing member 35 is in the shape of a rectangular frame, and is fixed to the upper surface of the movable base 32 together with the first plate springs 34A and 34B by thermal caulking, adhesion, or the like. That is, the outer fixing portions 34A of the first leaf springs 34A and 34B are sandwiched between the upper surface of the movable base 32 and the pressing member 35 and fixed.
The inner fixing portions 34B of the first plate springs 34A and 34B are fixed to the upper surface of the lens holder 31 by thermal caulking, adhesion, or the like.
Further, a fixing protrusion inserted through a mounting hole formed in the outer fixing portion 34A of the first leaf springs 34A and 34B and a mounting hole formed in the pressing member 35 is provided on the upper surface of the movable base 32. Further, on the upper surface of the lens holder 31, a fixing projection is provided which is inserted into a mounting hole formed in the inner fixing portion 34B of the first plate springs 34A and 34B.
As shown in fig. 3, a second leaf spring 36 is provided on the lower side of the movable base 32. The second plate spring 36 is formed of a metal plate having elasticity. The second plate spring 36 is integrally formed with an outer fixing portion 36a, an inner fixing portion 36b, and an elastic deformation portion 36c connecting the outer fixing portion 36a and the inner fixing portion 36 b.
The outer fixing portion 36a of the second leaf spring 36 is fixed to the lower end surface of the leg portion 32a formed to protrude downward (in the direction Z2) from the corner portion 4 of the movable base 32 by bonding, heat caulking, or the like. The inner fixing portion 36b of the second plate spring 36 is fixed to the lower surface of the lens holder 31 by an adhesive or the like.
The lens holder 31 is disposed inside the movable base 32, and first leaf springs 34A and 34B are fixed to the upper surface of the movable base 32 and the upper surface of the lens holder 31, and a second leaf spring 36 is fixed to the lower surface of the lens holder 31 and the lower portion of the movable base 32. Therefore, the lens holder 31 is supported in the movable base 32 so as to be movable in the Z1-Z2 direction, i.e., the optical axis direction, by the first leaf springs 34A and 34B and the second leaf spring 36.
As shown in fig. 3, a first coil 41 is provided on the outer periphery of the lens holder 31. The first coil 41 is configured by winding a coated wire around the outer periphery of the lens holder 31 with the center line O as a winding center. First coil 41 faces the inner surfaces of magnets 33x, 33y, and 33y with a gap. The first coil 41 and the magnets 33x, 33y, and 33y constitute a first drive mechanism for moving the lens holder 31 in the optical axis direction, i.e., the Z1-Z2 direction.
As shown in fig. 3, a pair of projections 31b and 31c are integrally formed on the upper portion of the lens holder 31, one end portion 42a of the covered wire constituting the first coil 41 is wound around the projection 31b, and the other end portion 42b is wound around the projection 31 c. At the terminal portions 42a, 42B, the coating of the coated wire is removed, one terminal portion 42a is soldered to the first plate spring 34A to be electrically connected thereto, and the other terminal portion 42B is soldered to the first plate spring 34B to be electrically connected thereto.
As shown in fig. 3, fixing holes 34d are formed in the corners of the first leaf springs 34A and 34B. As shown in fig. 2, the upper end portion 8a of the suspension wire 8 is inserted into the fixing hole 34d and fixed to the first leaf springs 34A and 34B by brazing.
The upper end portions 8a (see fig. 4) of the 2 suspension wires 8 fixed to the suspension fixing portions 14b of the one second metal piece 14A shown in fig. 5 are fixed to a first plate spring 34A (see fig. 3) fixed to the upper surface of the movable base 32, and the first plate spring 34A is electrically connected to one end portion 42a of the first coil 41. The upper end portions 8a (see fig. 4) of the 2 suspension wires 8 fixed to the suspension fixing portions 14B of the other second metal piece 14B shown in fig. 5 are fixed to a first leaf spring 34B (see fig. 3) fixed to the upper surface of the movable base 32, and the first leaf spring 34B is electrically connected to the other end portion 42B of the first coil 41.
As shown in fig. 5, the external terminal portions 14c are bent downward at the end portions of the second metal pieces 14A, the external terminal portions 14c are bent downward at the end portions of the second metal pieces 14B, and the external terminal portions 14c, 14c protrude downward from the base member 11. The first coil 41 can be energized through the pair of external terminal portions 14c and 14c, the second metal pieces 14A and 14B, and the suspension wire 8, and further through the first leaf springs 34A and 34B.
As shown in fig. 3 and 4, in the base structure portion 10, support raised portions 11a are formed at a plurality of positions on the upper surface of the base member 11, the insulating substrates 50A, 50B divided into 2 are provided on the support raised portions 11a, and the base member 11 and the insulating substrates 50A, 50B are fixed by an adhesive. The insulating substrates 50A and 50B are laminated substrates in which a plurality of insulating sheets are laminated. Each of the insulating sheets is formed with a coil conductor having a spiral loop pattern by using a copper foil or the like. The insulating sheets having coil conductors are stacked in plural, and the second coils 51x, 51y, and 51y in which the coil conductors are spirally connected are formed by conducting the upper and lower coil conductors.
The second coils 51X, 51Y are plane-wound coils that are wound along the X-Y plane. The second coils 51X, 51X are arranged in parallel with each other at intervals in the X direction, and the second coils 51Y, 51Y are arranged in parallel with each other at intervals in the Y direction.
As shown in fig. 2, the second coils 51x, 51x face the lower end surfaces of the magnets 33x, 33x fixed to the movable base 32 with a space therebetween, and the second coils 51y, 51y face the lower end surfaces of the magnets 33y, 33y fixed to the movable base 32 with a space therebetween. The second coils 51X, 51Y, and 51Y and the magnets 33X, 33Y, and 33Y constitute a second driving mechanism for moving the movable unit 30 including the lens holder 31 in the X direction and the Y direction. The second drive mechanism is a drive mechanism that moves the lens holder 31 relative to the base member 11 in a direction intersecting the optical axis. The movable unit 30 is configured to include a first coil 41, a lens holder 31, a movable base 32, magnets 33x, 33y, and 33y, first leaf springs 34A and 34B, a second leaf spring 36, and a pressing member 35.
As shown in fig. 4 and 5, the magnetic force detection elements 45x and 45y are provided on the base structure portion 10. The magnetic force detection elements 45x and 45y are mounted with hall elements and accompanying circuit components. As also shown in fig. 6, the magnetism detection element 45x is fixed to the lower surface of the insulating substrate 50B by soldering, and the magnetism detection element 45y is fixed to the lower surface of the insulating substrate 50A by soldering. In the assembled state shown in fig. 2, the magnetic field below 1 magnet 33x is detected by magnetic force detecting element 45x, and the magnetic field below 1 magnet 33y is detected by magnetic force detecting element 45 y. Magnetic force detecting element 45x faces magnet 33x through insulating substrate 50B, and magnetic force detecting element 45y faces magnet 33y through insulating substrate 50A.
As shown in fig. 4, a total of 6 conductive connecting portions 21a, 21B, 21c, 21d, 21e, and 21f are formed on one insulating substrate 50A, and a total of 6 conductive connecting portions 22a, 22B, 22c, 22d, 22e, and 22f are also formed on the other insulating substrate 50B.
The relay conductive portions 23a and 24a are formed on the one insulating substrate 50A at a portion facing the other insulating substrate 50B, and the relay conductive portions 23B and 24B are formed on the other insulating substrate 50B at a portion facing the one insulating substrate 50A. The relay conductive portion 23a and the relay conductive portion 23b are electrically connected via a relay conductive pattern 28a formed on the surface of the base member 11, and the relay conductive portion 24a and the relay conductive portion 24b are electrically connected via a relay conductive pattern 28 b.
The conductive connecting portions 21a, 21B, 21c, 21d, 21e, and 21f and 2 of the conductive connecting portions 22a, 22B, 22c, 22d, 22e, and 22f formed at the total 12 of the insulating substrates 50A and 50B are connected to the second coils 51X and 51X facing in the X direction via wiring patterns (not shown) formed on the insulating substrates 50A and 50B. Since the second coils 51x, 51x are provided on different insulating substrates 50A, 50B, 2 second coils 51x, 51x are connected in series by conducting a wiring pattern (not shown) for series connection formed on the insulating substrates 50A, 50B through the relay conductive portions 23a, 23B.
The other 2 conductive connection portions are connected to the second coils 51Y and 51Y facing in the Y direction via wiring patterns (not shown) formed on the insulating substrates 50A and 50B. Since the 2 second coils 51y and 51y are also provided on the different insulating substrates 50A and 50B, the 2 second coils 51y and 51y are connected in series by conducting the series connection wiring patterns (not shown) formed on the insulating substrates 50A and 50B through the relay conductive parts 24a and 24B.
At 6 points of the conductive connecting portions 21a, 21b, 21c, 21d, 21e, and 21f provided on the insulating substrate 50A, 4 conductive connecting portions among the conductive connecting portions are electrically connected to 4 terminal portions of the magnetism detecting element 45y via a wiring pattern (not shown) formed on the insulating substrate 50A. That is, a part of the 4 wiring patterns is exposed on the lower surface of the insulating substrate 50A, and the terminal portions of the magnetic force detectors 45y are soldered to the exposed portions (solder portions and pad portions). At 6 points of the conductive connecting portions 22a, 22B, 22c, 22d, 22e, and 22f provided on the insulating substrate 50B, 4 conductive connecting portions are electrically connected to 4 terminal portions of the magnetic force detecting element 45x via a wiring pattern (not shown) formed on the insulating substrate 50B. That is, a part of the 4 wiring patterns is exposed on the lower surface of the insulating substrate 50B, and the terminal portions of the magnetic force detectors 45x are soldered to the exposed portions (solder portions and pad portions).
In the lens driving device 1 of the embodiment, the yield of the material can be improved by using 2 insulating substrates 50A and 50B having an L-shaped planar shape in combination.
Fig. 4 shows the base member 11 in which the first metal pieces 12 and 13 and the second metal pieces 14A and 14B are embedded, and fig. 5 shows the first metal pieces 12 and 13 and the second metal pieces 14A and 14B in a state of being separated from the base member 11. In addition, third metal pieces 19a and 19b are also embedded in the base member 11.
As shown in fig. 5, the first surfaces 15A, 15B, 15C, 15D and the second surface 16 are formed on the upper portion of the base member 11 on the side facing Z1. The first surfaces 15A, 15B, 15C, 15D are formed lower than the second surface 16. The first surfaces 15A, 15B, 15C, 15D are formed at the same height position in the thickness direction (optical axis direction) of the base member 11. The second surface 16 forms the same plane at the upper portion of the base member 11 on the Z1 side except for the supporting ridge portion 11 a. The support ridge portion 11a is a portion that supports the insulating substrates 50A, 50B when the insulating substrates 50A, 50B are superimposed on the base member 11. The upper surface (front surface) of the supporting protrusion 11a is also located higher than the first surfaces 15A, 15B, 15C, and 15D, i.e., on the Z1 side (on the magnets 33x and 33y side), and thus constitutes a part of the second surface.
A slope 17A is formed at the boundary between the first surface 15A and the second surface 16. A slope 17B is formed at the boundary between the first surface 15B and the second surface 16. A slope 17C is formed at the boundary between the first surface 15C and the second surface 16. Similarly, a slope 17D is formed at the boundary between the first surface 15D and the second surface 16. In the cross-sectional view of fig. 6, the first surface 15C and the second surface 16 and the slope 17C are present. The rising angle θ of the slope 17C from the first surface 15C is preferably 45 degrees or less. More preferably 10 degrees to 40 degrees.
As shown in fig. 6, the magnetism detection element 45x fixed to the lower surface of the insulating substrate 50B enters the recess formed with the first surface 15C and faces the first surface 15C. Similarly, the magnetism detection element 45y fixed to the lower surface of the insulating substrate 50A is positioned in the recess formed with the first surface 15E, and faces the first surface 15E. The first surface 15E is formed at the same height as the first surfaces 15A, 15B, 15C, 15D described above. The magnetic force detection elements 45x and 45y are disposed in the recesses formed with the first surfaces 15C and 15E, whereby the base structure 10 can be configured to have a small height.
As shown in fig. 5, the first metal sheet 12 is provided with conduction portions 12a, 12b, 12c, 12d, 12e, and 12f separated from each other. The first metal sheet 13 is provided with conduction portions 13a, 13b, 13c, 13d, 13e, and 13f separated from each other. The conduction portions 12a, 12b, 12c, 12d, 12e, 12f and the conduction portions 13a, 13b, 13c, 13d, 13e, 13f are flat surfaces parallel to the X-Y plane. The conductive portions 12a, 12B, 12c, 12d, 12e, and 12f and the conductive portions 13a, 13B, 13c, 13d, 13e, and 13f are located at the same height position in the base member 11, and these conductive portions and the flat portions 14A and 14A of the second metal pieces 14A and 14B are also located at the same height position in the base member 11. That is, the conduction portions 12a, 12B, 12c, 12d, 12e, 12f of the first metal piece 12, the conduction portions 13a, 13B, 13c, 13d, 13e, 13f of the first metal piece 13, and the flat portions 14A, 14A of the second metal pieces 14A, 14B are located on the same height surface in the optical axis direction.
Therefore, the conduction portions 12a, 12B, 12c, 12d, 12e, 12f of the first metal piece 12, the conduction portions 13a, 13B, 13c, 13d, 13e, 13f of the first metal piece 13, and the flat portions 14A, 14A of the second metal pieces 14A, 14B are formed by separating from the same flat plate portion of the same metal plate, and are embedded in the base member 11 by insert molding.
As shown in fig. 5, the external terminal portions 12g, 12h, 12i, 12j, 12k, and 12m are bent downward from the conductive portions 12a, 12b, 12c, 12d, 12e, and 12f of the first metal piece 12, protrude downward from the base member 11, and are exposed outside the base member 11. The external terminal portions 13g, 13h, 13i, 13j, 13k, and 13m are bent downward from the conductive portions 13a, 13b, 13c, 13d, 13e, and 13f of the first metal piece 13, protrude downward from the base member 11, and are exposed to the outside of the base member 11.
As shown in fig. 5, the first surface 15A is provided with 4 exposed portions 18A, and the conduction portions 12a, 12b, 12c, 12d of the insert-molded first metal sheet 12 are exposed from the first surface 15A at the exposed portions 18A. In fig. 5, there are 3 exposed portions 18A. The first surface 15B is provided with a 2-position exposed portion 18B, and the conduction portions 12e and 12f are exposed from the first surface 15B at the exposed portion 18B.
Similarly, the exposed portion 18C at 4 is provided on the first surface 15C, and the conduction portions 13a, 13b, 13C, 13d of the insert-molded first metal sheet 13 are exposed from the first surface 15C at the exposed portion 18C. The first surface 15D is provided with a 2-position exposed portion 18D, and the conduction portions 13e and 13f are exposed from the first surface 15D at the exposed portion 18D.
As shown in fig. 4 and 5, conductive patterns 25A, 25b, 25c, 25d are formed from the first surface 15A through the slope 17A to the second surface 16. The conductive pattern 25A is connected to the conductive portion 12a exposed from the first surface 15A, and the conductive portion 25b is connected to the conductive portion 12 b. Conductive portions 12c and 12d are connected to conductive patterns 25c and 25d, respectively. Conductive patterns 25e, 25f are formed from the first surface 15B through the slope 17B to the second surface 16. Conductive portions 12e and 12f exposed from first surface 15B are connected to conductive patterns 25e and 25f, respectively.
Fig. 6 is a cross-sectional view taken along line VI-VI of fig. 4, and fig. 6 also shows the insulating substrate 50B and the magnetic force detection element 45x, which together with the base member 11 form the base structure portion 10, in an undecomposed state. Fig. 6 shows the conductive portion 13d, the external terminal portion 13j, and the conductive pattern 26d of the first metal piece 13. The conductive pattern 26d is a conductive layer formed by plating the surface of the printed layer, and is continuously formed from the first surface 15C to the second surface 16 through the inclined surface 17C. The printing method of the printing layer is an ink jet method, an application method using a mixer, an offset printing method, or the like. The printing may be performed in any other manner. Alternatively, instead of the printed layer, a copper foil layer or the like may be formed on the upper surface of the base member 11, and the conductive pattern 26d may be formed by etching.
The printed layer of the conductive pattern 26d is formed of a silver pattern obtained by printing a silver paste containing silver and a resin binder and firing (heating). In this embodiment, a plating layer is provided on the surface of the print layer. The plating layer is a layer in which a copper plating layer, a nickel plating layer, and a gold plating layer are formed in this order on the printing layer made of the silver pattern, and the outermost surface (outer surface) of the conductive pattern 26d is a gold plating layer. Further, a gold plating layer using copper and nickel as a base layer is preferably provided from the surface of the printed layer of the conductive pattern 26d to the surface of the conductive portion 13 d. In the case where the conductive pattern 26d is formed not by printing but by etching, the layer below the plating layer is a copper foil or the like.
As described above, when the angle θ of the inclined surface 17C is set to 45 degrees or less, preferably in the range of 10 to 40 degrees, the conductive pattern 26d can be formed continuously from the first surface 15C to the second surface 16 through the inclined surface 17C without interruption.
The formation of all the conductive patterns other than the conductive pattern 26d and the connection between the conductive pattern and the conductive portion are also the same as those in the structure shown in fig. 6. That is, the conductive pattern is partially overlapped on the upper surface of the conductive portion, and the conductive pattern is electrically connected to the conductive portion at the overlapped portion.
As shown in fig. 5, 2 exposed portions 18E, 18E are formed on the second surface 16 of the base member 11, and as shown in fig. 4, third metal pieces 19a, 19b are exposed at the exposed portions 18E, 18E. The third metal pieces 19a, 19B are cut out from the same metal plate as the first metal pieces 12, 13 and the second metal pieces 14A, 14B.
The relay conductive patterns 28a and 28b are formed on the second surface 16 of the base member 11. The relay conductive pattern 28a is partially overlapped on the third metal piece 19a to be connected to the third metal piece 19a, and the relay conductive pattern 28b is partially overlapped on the third metal piece 19b to be connected to the third metal piece 19 b. The relay conductive patterns 28a and 28b are formed by the same process and the same conductive material as those of the conductive patterns. By using the third metal sheets 19a and 19b as electrodes, gold plating with copper and nickel as a base can be performed on the surfaces of the printed layers of the relay conductive patterns 28a and 28 b.
Since the flat portion 14A of the second metal pieces 14A and 14B shown in fig. 5 is formed at the same height position as the conductive portions 12a, 12B, and … and the conductive portions 13a, 13B, and …, the flat portion 14A is also formed such that a part thereof is exposed from any of the first surfaces 15A, 15B, 15C, 15D, and 15E.
After the insulating substrate 50A is placed on the base member 11 and fixed with an adhesive, the conductive pattern 25a on the second surface 16 is soldered to the conductive connection portion 21a of the insulating substrate 50A. The conductive patterns 25b, 25c, 25d, 25e, and 25f are also soldered to the conductive connection parts 21b, 21c, 21d, 21e, and 21f, respectively. Similarly, after the insulating substrate 50B is placed on the base member 11 and fixed with an adhesive, the conductive pattern 26a on the second surface 16 is soldered to the conductive connection portion 22a of the insulating substrate 50B. Similarly, conductive patterns 26b, 26c, 26d, 26e, and 26f are soldered to conductive connection portions 22b, 22c, 22d, 22e, and 22f, respectively.
The relay conductive portions 23a and 23b are soldered to the relay conductive pattern 28a thereunder, and the relay conductive portions 23a and 23b are electrically connected to each other. The relay conductive parts 24a and 24b are soldered to the relay conductive pattern 28b thereunder, and the relay conductive parts 24a and 24b are electrically connected to each other. Before the insulating boards 50A and 50B are fixed to the base member 11, the magnetic force detection elements 45y and 45x are mounted on the lower surfaces of the insulating boards 50A and 50B.
With the above configuration, the external terminal portions 12g, 12h, 12i, 12j, 12k, 12m formed of the first metal sheet 12 and the external terminal portions 13g, 13h, 13i, 13j, 13k, 13m formed of the first metal sheet 13 are respectively electrically connected to the terminal portions of the second coils 51x, 51y and the magnetism detecting elements 45x, 45y via the conductive patterns 25a, 25b, 25c, 25d, 25e, 25f and the conductive patterns 26a, 26b, 26c, 26d, 26e, 26 f.
Next, the operation of the lens driving device 1 will be described.
When a drive current is applied to the first coil 41 from the external terminal portions 14c and 14c shown in fig. 5 via the suspension wire 8 and the first leaf springs 34A and 34B, the lens holder 31 is driven in the direction of the optical axis, i.e., the direction Z1 to Z2, by the coil current flowing around the center line O and the magnetic field from the inner surfaces of the magnets 33x, 33y, and 33y in the first drive mechanism, and the automatic focus adjustment of the lens held by the lens holder 31 is performed.
When the movable unit 30 is displaced in the X direction and the Y direction, the magnetic force detection element 45X detects the operation of the magnet 33X facing through the insulating substrate 50B, and the magnetic force detection element 45Y detects the operation of the magnet 33Y facing through the insulating substrate 50A, and detection signals thereof are detected from any of the external terminal portions 12g, 12h, 12i, 12j, 12k, 12m and the external terminal portions 13g, 13h, 13i, 13j, 13k, 13 m. The control unit generates a drive current for correcting the movement of the movable unit 30 in the X-Y direction, and applies the drive current to the second coils 51X, 51Y, and 51Y from any external terminal portion via the conductive pattern.
In the second driving mechanism, the movable unit 30 is driven in the X direction by the electromagnetic force generated by the magnetic flux reaching the outer surface from the inner surface of the magnet and the current flowing in the Y direction in the second coils 51X, 51X at the lower portions of the magnets 33X, 33X. Further, the movable unit 30 is driven in the Y direction by an electromagnetic force generated by a magnetic flux reaching the outer surface from the inner surface of the magnet and a current flowing in the X direction in the second coils 51Y, 51Y at the lower portions of the magnets 33Y, 33Y. Thereby, the hand shake correction is performed.
In the lens driving device 1, the base structure portion 10 is electrically connected to the insulating substrates 50A and 50B by combining the first metal pieces 12 and 13 embedded in the base member 11 and the conductive pattern formed on the surface of the base member 11, and thus a plurality of wiring paths can be efficiently configured. Further, since it is not necessary to use an FPC, the number of components can be reduced. Further, it is not necessary to adopt a complicated structure in which metal pieces buried in the base member 11 are overlapped and insulated, and all the metal pieces can be cut out from a flat surface portion of the same metal plate, and the base member 11 can be formed by insert molding.
In the lens driving device 1 of the embodiment, the conductive portions and the conductive patterns are connected to the first surfaces 15A, 15B, 15C, and 15D located at the low positions, and the conductive portions for connection between the conductive patterns and the insulating substrates 50A and 50B are soldered to the second surface 16 located at the high position. Therefore, the conductive portions formed of the metal plate do not abut against the insulating substrates 50A and 50B, and short-circuiting between the conductive portions and the wiring patterns formed on the insulating substrates 50A and 50B can be prevented.
Further, by forming the second surface at a position higher than the first surface, the base member 11 can be locally thickened, and the first metal piece, the second metal piece, and the third metal piece can be firmly embedded in the base member by insert molding.
In the above-described embodiment, the second coils 51x and 51y are formed of a laminated substrate in which a plurality of insulating sheets having coil conductors are laminated, but the second coils are not limited thereto. For example, the second coil may be formed by winding a wire into a predetermined shape, and the second coil may be mounted on the surface of the insulating substrate. In this case, the end portion of the second coil is connected to the wiring pattern of the insulating substrate, and the wiring pattern is electrically connected to the conductive connection portion formed on the insulating substrate.
In the above-described embodiment, the base member 11 has been described as having the support ridge portion 11a for placing and supporting the insulating substrates 50A and 50B, but the present invention is not limited to this. That is, the supporting raised portion 11a is not formed in the base member 11, and the insulating boards 50A and 50B may be placed on the second surface 16 of the base member 11 so as to overlap the base member 11.
The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made within the scope described in the claims.
This application claims priority to the basic application 2016, 254991, filed by the japanese patent office on 2016, 12, 28, and is hereby incorporated by reference in its entirety.
Description of the reference numerals
1 lens driving device
8 suspension wire (elastic support component)
10 base structure part
11 base member
12 first metal sheet
12a, 12b, 12c, 12d, 12e, 12f conduction part
12g, 12h, 12i, 12j, 12k, 12m external terminal section
13 first metal sheet
13a, 13b, 13c, 13d, 13e, 13f conduction part
13g, 13h, 13i, 13j, 13k, 13m external terminal section
14A, 14B second metal sheet
14a flat part
14b suspension fixing part
14c external terminal section
15A, 15B, 15C, 15D first surface
16 second surface
17A, 17B, 17C, 17D inclined plane
19a, 19b third metal sheet
21a, 21b, 21c, 21d, 21e, 21f connecting the conductive parts
22a, 22b, 22c, 22d, 22e, 22f connect the conductive parts
23a, 23b, 24a, 24b relay conductive part
25a, 25b, 25c, 25d, 25e, 25f conductive pattern
26a, 26b, 26c, 26d, 26e, 26f conductive pattern
28a, 28b relay conductive pattern
30 Movable Unit (Movable part)
31 lens holder (lens holding member)
32 movable base
33x, 33y magnet
34A, 34B first leaf spring
36 second leaf spring
41 first coil
45x, 45y magnetic force detecting element
50A, 50B insulating substrate
51x, 51y second coil (coil)
Claims (10)
1. A lens driving device has:
a base member; a lens holding member capable of holding a lens body; and a drive mechanism for moving the lens holding member, the drive mechanism being configured to have a magnet and a coil,
the above-described lens driving device is characterized in that,
the base member is made of an insulating material, a first metal piece is embedded in the base member, an external terminal portion and a conductive portion are formed in the first metal piece,
the external terminal portion is exposed from the base member to the outside,
a conductive pattern formed on the surface of the base member, the conductive pattern being electrically connected to the conductive portion and the coil being electrically connected to the conductive pattern,
the surface of the base member has a first surface and a second surface located at a higher position than the first surface,
the conductive portion of the first metal sheet is connected to the conductive pattern formed from the first surface to the second surface.
2. The lens driving device according to claim 1,
an inclined surface is formed between the first surface and the second surface, and the conductive pattern is formed from the first surface to the second surface via the inclined surface.
3. The lens driving device according to claim 2,
the angle of rising of the slope from the first surface is 45 degrees or less.
4. The lens driving device according to any one of claims 1 to 3,
a movable portion on which the lens holding member is mounted is supported by the base member via an elastic support member, the magnet is mounted on the movable portion, an insulating substrate having the coil facing the magnet is stacked on the base member,
the conductive pattern is joined to a conductive connection portion formed on the insulating substrate, and the conductive pattern is electrically connected to the coil via a wiring pattern of the insulating substrate.
5. The lens driving device according to any one of claims 1 to 3,
a movable portion on which the lens holding member is mounted is supported by the base member via an elastic support member, the magnet is mounted on the movable portion, an insulating substrate having the coil facing the magnet and a magnetism detecting element facing the magnet is stacked on the base member,
the conductive pattern formed on the second surface is joined to a conductive connection portion formed on the insulating substrate, a part of the conductive pattern is electrically connected to the coil via a wiring pattern of the insulating substrate, and the other part of the conductive pattern is electrically connected to the magnetic force detecting element via a wiring pattern of the insulating substrate.
6. The lens driving device according to claim 5,
the magnetic force detection element is opposed to the first surface of the base member.
7. The lens driving device according to any one of claims 4 to 6,
the insulating substrate is a laminated substrate in which a plurality of insulating sheets are laminated, and the coil is formed of a coil conductor formed in each of the insulating sheets.
8. The lens driving device according to any one of claims 4 to 7,
the insulating substrate is divided into a plurality of parts, and relay conductive parts provided on the insulating substrates are electrically connected to each other via a relay conductive pattern provided on the surface of the base member.
9. The lens driving device according to any one of claims 1 to 3,
a movable portion on which the lens holding member is mounted is supported by the base member via a suspension wire, the magnet is mounted on the movable portion, the coil is provided on the base member side,
a second metal piece for supporting the suspension wire is embedded in the base member, the second metal piece is formed of the same metal plate as the first metal piece, and the second metal piece is positioned on the same level surface as the conductive portion of the first metal piece.
10. A lens driving device has:
a base member; a lens holding member capable of holding a lens body; and a drive mechanism for moving the lens holding member, the drive mechanism being configured to have a magnet and a coil,
the above-described lens driving device is characterized in that,
the base member is made of an insulating material, a first metal piece is embedded in the base member, an external terminal portion and a conductive portion are formed in the first metal piece,
the external terminal portion is exposed from the base member to the outside,
a conductive pattern formed on the surface of the base member, the conductive pattern being electrically connected to the conductive portion and the coil being electrically connected to the conductive pattern,
a movable portion on which the lens holding member is mounted is supported by the base member via an elastic support member, the magnet is mounted on the movable portion, an insulating substrate having the coil facing the magnet is stacked on the base member,
the conductive pattern is joined to a conductive connection portion formed on the insulating substrate, the conductive pattern is electrically connected to the coil via a wiring pattern of the insulating substrate,
the insulating substrate is divided into a plurality of parts, and relay conductive parts provided on the insulating substrates are electrically connected to each other via a relay conductive pattern provided on the surface of the base member.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016254991 | 2016-12-28 | ||
| JP2016-254991 | 2016-12-28 | ||
| PCT/JP2017/045956 WO2018123815A1 (en) | 2016-12-28 | 2017-12-21 | Lens-driving apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110140083A CN110140083A (en) | 2019-08-16 |
| CN110140083B true CN110140083B (en) | 2021-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780080946.5A Active CN110140083B (en) | 2016-12-28 | 2017-12-21 | Lens driving device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6678252B2 (en) |
| CN (1) | CN110140083B (en) |
| WO (1) | WO2018123815A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102614773B1 (en) * | 2018-09-05 | 2023-12-18 | 엘지이노텍 주식회사 | Lens driving device and camera device |
| CN114755793A (en) * | 2020-12-29 | 2022-07-15 | 新思考电机有限公司 | Lens driving device, camera device, and electronic apparatus |
| GB2607901B (en) * | 2021-06-14 | 2023-10-25 | Cambridge Mechatronics Ltd | Voice coil motor actuator assembly |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2018123815A1 (en) | 2019-07-11 |
| CN110140083A (en) | 2019-08-16 |
| JP6678252B2 (en) | 2020-04-08 |
| WO2018123815A1 (en) | 2018-07-05 |
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