JP2018173581A - Electromagnetic driving device for mobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a driving coil and a positional sensor to be disposed on a base member without providing a complicated wiring structure or terminal structure on the base member in electromagnetic driving devices for mobiles.SOLUTION: An electromagnetic driving device for a mobile (lens driving device 1) includes: a base member 2; a driving coil 4A attached to the base member 2; a movable member 3 to which a magnet 5 is attached and which is movably supported by the base member 2; and a positional sensor 10 provided on the base member 2 for detecting the position of the magnet 5. The coil 4A is a planar plate coil 4 in which a coil is disposed in plane arrangement among multiple layers of insulation layers, and includes, in part of the insulation layers, a wiring 14 and a terminal part 15 to which the positional sensor 10 is connected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mobile electromagnetic drive device.

  Various electromagnetic drive devices are used in mobile devices such as portable information terminals and wearable electronic devices. In particular, a camera unit is mounted on various mobile devices, and a lens driving device that drives AF (Autofocus) or OIS (Optical Image Stabilizer) is used for the camera unit.

  An electromagnetic driving device such as a lens driving device is generally known as a moving magnet type device in which a driving coil is attached to a base member, and a magnet is attached to a movable member that is movably supported with respect to the base member. It has been. In such an electromagnetic drive device, a drive coil and a wiring member and a terminal member for energizing the coil are provided on the base member. Further, in order to control the AF and OIS described above, a position sensor for detecting the position of a magnet attached to the movable member is provided on the base member (see Patent Document 1 below).

JP 2006-14705 A

  In the conventional electromagnetic driving device described above, a driving coil and a position sensor are provided on a base member, and further, a wiring for energizing them is provided on the base member. This complicates the wiring structure and terminal structure on the base member. Electromagnetic drive devices mounted on mobile devices have a small support area for the base member due to high space-saving requirements, making it difficult to provide complex wiring and terminal structures in a narrow space on the base member was there.

  An object of the present invention is to cope with such a situation, and in a mobile electromagnetic drive device, a drive coil and a position sensor are provided as a base member without providing a complicated wiring structure or terminal structure in the base member. The challenge is to be able to deploy to

  In order to solve such a problem, the mobile electromagnetic drive device according to the present invention has the following configuration.

  An electromagnetic drive device for a mobile device, comprising: a base member; a drive coil attached to the base member; a magnet attached to the base member; and a movable member supported movably on the base member; And a position sensor for detecting the position of the magnet, wherein the coil is a planar substrate coil in which windings are installed in a plane on a multilayer insulating layer, and the position sensor is connected to a part of the insulating layer. A mobile electromagnetic drive device comprising a wiring and a terminal portion.

It is explanatory drawing (disassembled perspective view) which showed the structural example of the electromagnetic drive device (lens drive device) for mobiles concerning embodiment of this invention. It is explanatory drawing (plan view) which showed the structural example of the electromagnetic drive device (lens drive device) for mobiles concerning embodiment of this invention. (A) is A1-A1 sectional drawing in FIG. 2, (b) is A2-A2 sectional drawing in FIG. It is a top view of the state which mounted the planar substrate coil in the base member. FIG. 5 is a partial plan view of FIG. 4. 5A is an RR diagram in FIG. 5, FIG. 5B is an SS sectional view in FIG. 5, and FIG. 5C is a UU sectional view in FIG. 5. It is ZZ sectional drawing in FIG. It is a front view of other embodiment of the state which mounted the planar substrate coil in the base member. FIG. 9 is a partial plan view of FIG. 8. (A) is PP sectional drawing in FIG. 9, (b) is QQ sectional drawing in FIG. (A) is TT sectional drawing in FIG. 9, (b) is VV sectional drawing in FIG. 9, (c) is a perspective view which shows the position sensor holding | maintenance part in a base member. It is A3-A3 sectional drawing in FIG. It is sectional drawing which showed the attachment state of the position sensor. ((A) is the example which provided the through-hole in the plane substrate coil, (b) is the example which provided the recessed part in the plane substrate coil, (c) is the plane substrate coil. Example attached above). (A) is explanatory drawing which showed the imaging device which mounted the electromagnetic drive device (lens drive device) for mobiles, (b) is the portable electronic device (mobile information terminal) which mounted the electromagnetic drive device (lens drive device) for mobiles It is explanatory drawing which showed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings indicate parts having the same function, and repeated description in each drawing will be omitted as appropriate.

  Here, as an example of a mobile electromagnetic drive device, a lens drive device will be described as an example. However, the present invention is not limited to this, and various types may be used as long as a drive coil is attached to a similar base member. It can be applied to an electromagnetic drive device. The XY direction shown in the figure indicates the direction orthogonal to the optical axis, and the Z direction indicates the optical axis direction of the lens not shown.

  As shown in FIGS. 1 to 4, a lens driving device 1 that is an example of an electromagnetic driving device for mobile includes a base member 2 and a movable member 3 that is movably supported by the base member 2 as a basic configuration. ing. A planar substrate coil 4 is attached to the base member 2, and a magnet 5 is attached to the movable member 3. The planar substrate coil 4 includes a driving coil 4A, and the coil 4A and the magnet 5 constitute a driving unit of the lens driving device 1. In the illustrated example, the movable member 3 is a cylindrical member having a rectangular outer edge in plan view, and includes a magnet holding portion 3 </ b> A that holds the magnet 5 inside the corner portion.

  The base member 2 has an opening 2A. A support surface 2B along the XY plane is provided around the opening 2A, and the planar substrate coil 4 is supported on the support surface 2B. In the illustrated example, the base member 2 includes an outer edge that is rectangular in plan view.

  The movable member 3 is supported by the base member 2 via a support wire 6. The support wire 6 extends along the Z direction (optical axis direction) in the drawing, and one end thereof is fixed to the base member 2 side (the wiring member 20 provided on the base member 2), and the other end is movable. It is fixed to the member 3 side (upper leaf springs 9B and 9C fixed to the movable member 3). The movable member 3 is suspended and supported by a support wire 6, and is supported so as to be movable in the XY direction (direction intersecting the optical axis) by the bending of the support wire 6. In the illustrated example, a plurality (four) of the support wires 6 are provided, one end of the support wire 6 is fixed to the four corners of the base member 2 having a rectangular outer edge in plan view, and the movable member 5 is movable outside thereof. A stopper 2C for limiting the range is provided.

  A lens frame 7 is movably supported on the movable member 3. The lens frame 7 is a cylindrical member provided with a screw portion 7A to which a lens barrel (not shown) is attached, and a focus coil 8 is wound around a coil holding portion 7B provided on the outer periphery. The lens frame 7 is disposed inside the movable member 3 that is a cylindrical member, and a magnetic gap is formed between the magnet 5 attached to the movable member 3 and the focus coil 8.

  The lens frame 7 is supported by a plate spring 9 so as to be movable along the optical axis direction (Z direction in the drawing). The plate spring 9 includes a lower plate spring 9A that elastically connects the lower end 7C of the lens frame 7 and the lower end 3B of the movable member 3, an upper end 7D of the lens frame 7, and an upper end 3C of the movable member 3. Upper leaf springs 9B and 9C that are elastically connected are provided. The upper leaf springs 9B and 9C are constituted by two symmetrical members.

  The planar substrate coil 4 has a multi-layered insulating layer and is a planar arrangement of driving coils 4A. The coil 4A may be one in which a winding is wound in a planar manner on one insulating layer, or may be one in which a winding is wound in multiple stages around a multilayer insulating layer. In addition, although the planar substrate coil 4 in this Embodiment uses resin as an insulating layer, in other embodiment, not only this but a film material etc. may be used.

  As shown in FIG. 4, the planar substrate coil 4 supported by the base member 2 having a rectangular outer edge is arranged so that the coils 4A are positioned at the four corners of the base member 2, and the linear portions of the adjacent coils 4A are arranged. They are arranged so that their directions intersect each other. The four coils 4 </ b> A are disposed to face the four magnets 5 attached to the movable member 3.

  In the example shown in FIG. 4, the movable frame 3 can be driven in two directions perpendicular to the optical axis by the four coils 4A. That is, the drive unit of the present embodiment has two drive axes Da. The drive axis Da is an axis that passes through the center of the thrust generation source and that is indicated by the direction in which the movable frame 3 moves when the drive coil 4A is energized. When there is one coil and one magnet, the drive shaft Da passes through the center of the thrust generation source. However, when a plurality of coils or magnets are used for the same drive shaft, the direction of the resultant force is driven. It becomes the axis Da.

  As shown in FIG. 4, a position sensor 10 is mounted on the planar substrate coil 4. The position sensor 10 detects a moving position of the movable member 3 by detecting a magnetic field change of the magnet 5 attached to the movable member 3, and a Hall element or the like is used. The position sensor 10 is disposed at a position corresponding to the corner of the base member 2 so as to face two of the four magnets 5. In the example shown in the figure, two position sensors 10 are arranged at the core portions of two adjacent coils 4A so that their directions intersect each other.

The planar substrate coil 4 includes lead wires 11 and 12 drawn from the coil 4A. Of the lead wires 11 and 12, one lead wire 11 is connected to the input terminal portion 13, and the other lead wire 12 is connected in series to each other in the coil 4A. Thus, the magnet 5 drives the movable member and is also used for position detection. And each of the two position sensors 10 is arrange | positioned on the drive shaft of a drive part.
In other embodiments, a dedicated magnet for position detection may be provided, or a magnet provided for a purpose other than driving may be used for position detection.

  Further, the planar substrate coil 4 includes a wiring 14 to which the position sensor 10 is connected and a terminal portion 15 in a part of the insulating layer. In the example shown in FIG. 4, the terminal portion 15 is provided on the core portion of the coil 4 </ b> A in the planar substrate coil 4. The wiring 14 connected to the terminal portion 15 extends on the insulating layer of the planar substrate coil 4 and is connected to a concave connection land 16 provided on the peripheral portion of the planar substrate coil 4. The wiring 14 can be disposed at a position overlapping the coil 4A in a planar manner by being disposed in an insulating layer different from the layer in which the coil 4A is disposed.

  On the other hand, the wiring member 20 is provided in the base member 2. The wiring member 20 is, for example, a lead frame, and is integrally formed (insert molding) on the resin base member 2. An end portion 20A of the wiring member 20 is drawn out to the outer peripheral portion of the base member 2, and serves as a connection terminal to the circuit board. The wiring member 20 is not limited to a lead frame, and various wiring structures can be employed. For example, the wiring member 20 may be formed by MID (Molded Interconnect Device) technology. .

  The base member 2 is provided with a terminal protrusion 20 </ b> P for connecting the wiring member 20 and the planar substrate coil 4. The terminal protrusion 20P can be constituted by a part of the wiring member 20 such as a lead frame, or can be formed by protruding a pin-like member connected to the wiring member 20 on the support surface 2B. Further, the terminal protrusion 20P can be formed by providing a protrusion on the base member 2 itself and integrally forming it with the MID technique or the like.

  The terminal protrusion 20P is provided so as to protrude from the surface (for example, the support surface 2B) of the base member 2, and the planar substrate coil 4 is side-connected to the terminal protrusion 20P. Thereby, it becomes a connection structure in which solder does not enter between the flat substrate coil 4 and the support surface 2B.

  A connection structure between the terminal protrusion 20P and the planar substrate coil 4 will be described with reference to FIGS. A part of the terminal protrusion 20 </ b> P is disposed in a concave connection land 16 provided on the peripheral edge of the planar substrate coil 4. Further, the terminal protrusion 20 </ b> P is disposed so that the other part penetrates the input terminal portion 13 of the planar substrate coil 4.

  As shown in FIGS. 6 and 7, the terminal protrusion 20 </ b> P disposed in the input terminal portion 13 or the connection land 16 is connected to the input terminal portion 13 or the connection land 16 from the surface side of the planar substrate coil 4 by the solder 21. Is done. The solder 21 entering the hole of the input terminal portion 13 or the recess of the connection land 16 is electrically connected to the side surface of the terminal protrusion 20P and the side surface of the planar substrate coil 4.

  As a result, the bottom surface of the planar substrate coil 4 is supported on the support surface 2B of the base member 2 without a gap, and compared with a connection structure in which solder is interposed between the planar substrate coil 4 and the support surface 2B. It can be configured to be thin. Also, since the soldering operation can be performed from the surface side of the planar substrate coil 4 while visually recognizing the terminal protrusion 20P, the workability is good and a reliable connection is possible.

  In addition, by providing the planar substrate coil 4 with wiring (drawing wirings 11 and 12 and wiring 14) and the terminal portion 15, a complicated wiring structure and terminal structure in the base member 2 can be omitted. Thereby, the base member 2 can be reduced in size, and the coil 4 </ b> A and the position sensor 10 can be disposed on the reduced base member 2 in a space efficient manner. Since the wiring in the planar substrate coil 4 can be wired in multiple stages using a multi-layered insulating layer, high-density wiring is possible over a narrow surface area. As a result, the lens driving device 1 can be further reduced in size.

  Another example of the connection structure of the position sensor 10 will be described with reference to FIGS. In this example, the planar substrate coil 4 includes a terminal portion 17 at the peripheral portion thereof, and the terminal portion 15 to which the position sensor 10 is connected and the terminal portion 17 are connected by the wiring 14. The terminal portion 17 is connected to a flexible printed circuit board (FPC) 22. Further, in order to connect the terminal portion 17 of the planar substrate coil 4 and the FPC 22 with the solder 21, the base member 2 is formed with a recess 2 </ b> D for solder escape.

  On the support surface 2 </ b> B of the base member 2, a solder relief recess 2 </ b> E is formed in order to connect the terminal portion 15 of the planar substrate coil 4 and the position sensor 10 with the solder 21. The recess 2E is provided with a support protrusion 2F for supporting the position sensor 10 itself at the center. In order to connect the position sensor 10 to the terminal portion 15, the position sensor 10 is disposed in the opening formed in the core portion of the coil 4 </ b> A in the planar substrate coil 4, and the position sensor 10 is placed on the support protrusion 2 </ b> F of the base member 2. In a supported state, it is connected to the terminal portion 15 with solder 21.

Assembling of the position sensor 10 can support the planar substrate coil 4 on the support surface 2 </ b> B of the base member 2 in a state where the position sensor 10 is mounted on the planar substrate coil 4 in advance. The mounting state of the position sensor 10 on the planar substrate coil 4 can be a mounting example as shown in FIGS. In the example shown in FIG. 13A, a through hole is provided in the planar substrate coil 4, the position sensor 10 is accommodated therein, and the connection portion 15 and the terminals of the position sensor 10 are soldered on the back side of the planar substrate coil 4. 21 is connected. In the example shown in FIG. 13B, a step portion is formed in the thickness direction of the planar substrate coil 4, and the connection portion 15 and the terminal of the position sensor 10 are connected by the solder 21 in a state where the position sensor 10 is half-dropped. doing. In the example shown in FIG. 13C, the connection portion 15 is provided on the surface of the planar substrate coil 4, and the position sensor 10 is mounted on the planar substrate coil 4.
In other examples, terminal part 15 may be provided in addition to the core part of coil 4A. That is, the position sensor 10 may be disposed at a position that does not overlap with the coil 4A in plan view. And the terminal part 15 is provided according to the position of the position sensor 10 arrange | positioned in this way.

  As described above, in the mobile electromagnetic driving device (lens driving device 1) according to the embodiment of the present invention, the position sensor 10 is connected to a part of the insulating layer of the planar substrate coil 4 supported by the base member 2. Since the wiring 14 and the terminal portion 15 are provided, the driving coil 4A and the position sensor 10 can be provided on the base member 2 without providing a complicated wiring structure or terminal structure on the base member 2. Space saving of the member 2 is possible. In addition, by providing the connection part 15 of the position sensor 10 on the planar substrate coil 4, workability when assembling the position sensor 10 can be improved, and further, the position sensor 10 is mounted on the planar substrate coil 4 in advance. Therefore, since it can assemble | attach to the base member 2, the workability | operativity of an assembly can be improved.

  Such a mobile electromagnetic drive device (lens drive device 1) can be mounted on a small-sized imaging device 100 as shown in FIG. 14A, and is also portable as shown in FIG. 14B. It can be incorporated into a camera unit of an electronic device (personal digital assistant) 200 or the like. Since the mobile electromagnetic drive device incorporated in these can save the space occupied in the incorporated device, it can contribute to the downsizing and thinning of the imaging device 100 and the portable electronic device 200.

  In addition to the imaging device 100, the mobile electromagnetic drive device can be equipped with a vibration motor (vibration actuator) using a VCM (VCM: Voice Coil Motor). Furthermore, this vibration motor can be incorporated in the vibration unit of the portable electronic device (personal digital assistant) 200.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. In addition, the above-described embodiments can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose and configuration.

1: Lens drive device,
2: base member, 2A: opening, 2B: support surface,
2C: Stopper, 2D, 2E: Recess, 2F: Support protrusion,
3: movable member, 3A: magnet holding part, 3B: lower end part, 3C: upper end part,
4: Planar substrate coil, 4A: Coil, 5: Magnet, 6: Support wire,
7: Lens frame,
7A: Screw part, 7B: Coil holding part, 7C: Lower end part, 7D: Upper end part,
8: Focus coil, 9: Leaf spring, 9A: Lower leaf spring, 9B, 9C: Upper leaf spring,
10: Position sensor, 11, 12: Lead-out wiring, 13: Input terminal section,
14: Wiring, 15, 17: Terminal part, 16: Connection land,
20: wiring member, 20A: end, 20P: terminal protrusion, 21: solder,
22: Flexible printed circuit board (FPC)
100: imaging device, 200: portable electronic device (portable information terminal)

Claims (6)

An electromagnetic drive for a mobile device,
A base member;
A driving coil attached to the base member;
A movable member that is attached to a magnet and is movably supported by the base member;
A position sensor provided on the base member for detecting the position of the magnet;
The coil is a planar substrate coil in which windings are arranged in a plane between multiple insulating layers, and includes a wiring and a terminal portion to which the position sensor is connected in part of the insulating layer. Electromagnetic drive device.   The mobile electromagnetic drive device according to claim 1, wherein the base member is provided with the same number of position sensors as drive shafts.   The mobile electromagnetic drive device according to claim 1, wherein the position sensor is provided on a drive shaft.   4. The mobile electromagnetic drive device according to claim 1, wherein a terminal portion to which the position sensor is connected is provided on a core portion of the planar substrate coil. 5.   The imaging device provided with the electromagnetic drive device for mobiles described in any one of Claims 1-4.   The portable electronic device provided with the electromagnetic drive device for mobiles described in any one of Claims 1-4, or the imaging device of Claim 5.

Images