JP2009239993A - Drive module and electronic apparatus with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a drive load, to simplify a constitution, and to reduce a size, in a drive module and an electronic apparatus with the same. <P>SOLUTION: The drive module 1 includes: a lens frame 4 composed of a substantially-columnar body arranged so that its axial line goes along a drive direction; a module frame 5 having an receiving part 5A which movably receives the lens frame 4 along the drive direction; upper plate springs 6, 7 for movably supporting the lens frame 4 in the drive direction; power feeding members 9, 10 for feeding power from the outside; and a shape-memory alloy actuator 40 which is electrically connected to the power feeding members 9, 10, whose shape is stored so as to be elongated along the drive direction by self-heat generation at power application, and which varies a position of the drive direction of the lens frame 4 with respect to the module frame 5 by the energization of both ends in the elongation direction to the lens frame 4 and the module frame 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drive module and an electronic apparatus including the drive module. For example, the present invention relates to a drive module that is suitable for adjusting the focal position by driving an optical system or a movable member, or using the actuator as an actuator, and an electronic apparatus including the drive module.

2. Description of the Related Art Conventionally, in a small electronic device such as a mobile phone with a camera function, an apparatus using a drive module that drives a driven body such as a photographing lens unit with a shape memory alloy wire is known.
As such a drive module and electronic device, in Patent Document 1, a first lens frame having a lens group assembled thereto, and the first lens frame are fixed and movably attached to a guide shaft along the drive direction. A second lens frame, and a string-shaped shape memory alloy (shape memory alloy wire) that is contracted by the second lens frame and contracts when an electric current is applied to bias the second lens frame in the driving direction. A lens driving device including a compression coil spring that urges the second lens frame along a guide shaft to press the second lens frame against the shape memory alloy, and an imaging device including the lens driving device are described.
In addition, this lens driving device detects the position of the second lens frame using a photo interrupter, thereby eliminating variations in the amount of movement of the lens group due to minute length errors and mounting errors of the shape memory alloy wire. (See paragraph number <0058> of Patent Document 1).
JP 2007-57581 A

However, the conventional drive module as described above has the following problems.
In the lens driving device described in Patent Document 1, since the driving of the second lens frame is guided using the guide shaft, a sliding load is generated. For this reason, there is a problem in that rapid driving cannot be performed and, for example, the focusing speed of the camera becomes slow.
In addition, the string-like shape memory alloy is sandwiched and cut between the plate members at both ends, and this plate member is fixed to the upper part of the columnar body, and the length of the string-like shape memory alloy varies in production. It has become easier. Further, since the string-shaped shape memory alloy is fixed by being sandwiched between the plate members, the length of the string-shaped shape memory alloy between the plate members is changed even when the holding force of the plate member is reduced with time. Further, when the plate member is attached to the columnar body, an attachment error may occur. In order to eliminate the influence of these errors, in Patent Document 1, a position detection means such as a photo interrupter is provided. For this reason, there are problems that the number of parts increases and the apparatus configuration becomes complicated.
In the case of driving with a string-like shape memory alloy, the driving range of the lens group is determined depending on the length of the string-like shape memory alloy. Therefore, there is a problem that the apparatus becomes large because it has to be stretched.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drive module that can reduce the drive load and can be simplified and downsized, and an electronic apparatus including the drive module. And

In order to solve the above-described problems, in the invention according to claim 1, a driven body composed of a substantially columnar body arranged such that the axis is along the driving direction, and the driven body along the driving direction. A support body having a cylindrical portion that is movably accommodated, and is attached so as to extend in a direction perpendicular to the drive direction between the driven body and the support body, and face each other in parallel without load A pair of parallel leaf springs arranged to support the driven body so as to be movable in the driving direction, a power supply member that supplies current from the outside, and a power supply member that is electrically connected to and supplied from the power supply member The shape is memorized so as to extend along the driving direction by self-heating during energization of the generated current, and both ends in the extending direction urge the driven body and the supporting body, respectively, thereby supporting the supporting body. Of the driven body relative to the body The position of the serial driving direction and configured to include a shape memory alloy actuator that variably.
According to this invention, the driven bodies are arranged so as to face each other so as to be parallel to each other in a no-load state with respect to the support, and the parallel leaf spring pair that supports the driven bodies so as to be movable in the driving direction Since it is elastically supported, it is supported so as to be movable along the driving direction without using a means for generating a sliding load such as a sliding guide.
Then, by energizing the shape memory alloy actuator through the power supply member, the shape memory alloy actuator is expanded by self-heating according to the energization amount, and the driven body and the support are connected to both ends of the shape memory alloy actuator. By this, the position of the support in the driving direction with respect to the driven body is changed, and the driven body is driven.
When energization is stopped, the shape memory alloy actuator is cooled and the length of the shape memory alloy actuator in the driving direction contracts, and is pushed back by the elastic restoring force from the parallel leaf spring pair to return to the length before extension. To do. For this reason, it is possible to perform repeated driving.
Since the shape memory alloy actuator extends both ends and biases the driven body and the support body in the driving direction, the shape memory alloy actuator moves along the driving direction between the driven body and the support body in the driving direction. Can be arranged. In addition, since an elastic restoring force against the movement of the driven body is generated from the pair of parallel leaf springs, the shape memory alloy actuator may only be locked to the driven body and the support body. When using a shape memory alloy wire As described above, it is possible to adopt a configuration in which the wire is not stretched in a space intersecting the driving direction and the wire end is not fixed to another member by caulking or the like.
In addition, the substantially columnar body of the driven body is used in a broad sense including all forms whose outer shape is substantially columnar. Therefore, it is not limited to a solid columnar body, and includes, for example, a cylindrical body provided with a through-hole in the center. Further, an assembly such as a lens assembly is included as long as the outer shape is substantially columnar. Further, the substantially columnar body does not mean a complete columnar body, and may have a protruding portion or the like in part.

According to a second aspect of the present invention, in the drive module according to the first aspect, the shape memory alloy actuator has a coil shape wound around the drive direction.
According to this invention, since the shape memory alloy actuator has a coil shape, by changing the number of turns of the coil and the thickness of the coil wire, various conditions such as the extension amount and the urging force of the shape memory alloy actuator can be obtained. Can be set. For this reason, compared with the case where the shape memory alloy wire which should set these conditions mainly changing only length is used, it can provide in a compact shape.

According to a third aspect of the present invention, in the drive module according to the first or second aspect, the driven body is provided with a protruding portion that protrudes radially outward of the columnar body, and the support body includes: A support portion is provided at a position facing the protrusion portion of the driven body, and the shape memory alloy actuator extends along the drive direction between the protrusion portion of the driven body and the support portion of the support body. It is assumed that the configuration is arranged.
According to the present invention, since the shape memory alloy actuator is disposed along the driving direction between the protruding portion protruding radially outward from the driven body and the supporting portion of the supporting body facing the protruding portion, The shape memory alloy actuator can be provided in a range where the protrusion and the support portion face each other. For this reason, the shape seen from the drive direction becomes compact.

According to a fourth aspect of the present invention, in the drive module according to the third aspect, the outer shape is substantially a prism shape, and the center of the column is disposed along the axis, whereby the driven body, the support body, And a cover member that surrounds the shape memory alloy actuator from the outside in the radial direction with respect to the axis, and the protrusion of the driven body and the support of the support are provided in the vicinity of a column corner of the cover member. The configuration is as follows.
According to this invention, since the protrusion part of the driven body and the support part of the support body are provided in the vicinity of the column corner of the cover member whose outer shape is a substantially prismatic shape, the device is compact.

According to a fifth aspect of the present invention, in the drive module according to the third aspect, the protrusion of the driven body and the support portion of the support body are provided inside a cylindrical portion of the support body, The shape memory alloy actuator is configured to be accommodated in the cylindrical portion of the support and to have a shape surrounding an outer periphery of the driven body.
According to the present invention, since the shape memory alloy actuator is formed in a shape that surrounds the outer periphery of the driven body and is accommodated in the cylindrical portion of the support, the shape memory alloy actuator is formed in the cylindrical portion of the support. Can be as large as. Therefore, it can be set as a compact structure.

According to a sixth aspect of the present invention, in the drive module according to the fifth aspect, one of the parallel leaf spring pairs is fixed to the driven body, and one of the parallel spring pairs is fixed to the driven body. The portion serves as the protrusion of the driven body.
According to the present invention, the fixed portion of the parallel spring pair to one driven body also serves as the protrusion of the driven body, so that the driven body can have a simple configuration.

According to a seventh aspect of the present invention, an electronic device includes the drive module according to any one of the first to sixth aspects.
According to this invention, since the drive module is provided, the same operation as that of any one of claims 1 to 6 is provided.

  According to the drive module of the present invention and the electronic apparatus including the drive module, the driven body can be supported along the driving direction by the pair of parallel leaf springs, and the driven body and the support are formed at both ends of the shape memory alloy actuator. Since the driven body can be driven by energizing in the driving direction, the driving load can be reduced, and the configuration can be simplified and downsized.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are denoted by the same reference numerals, and common description is omitted.

[First Embodiment]
The drive module according to the first embodiment of the present invention will be described.
FIG. 1 is a schematic perspective exploded view for explaining a mounting state of a drive module according to a first embodiment of the present invention on a substrate. FIG. 2 is a schematic perspective exploded view showing a schematic configuration of the drive module according to the first embodiment of the present invention. FIG. 3A is a plan view of FIG. 1A. FIG. 3B is a schematic BB cross-sectional view of FIG. FIG. 4 is a schematic perspective view showing the internal configuration of the assembled state of the drive module according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line CC in FIG. FIG. 6 is a plan view of a leaf spring member used in the drive module according to the first embodiment of the present invention.
In some of the drawings, for the sake of clarity, for example, components such as the lens unit 12 are omitted as appropriate.

As shown in FIG. 1, the drive module 1 of this embodiment is formed in a box shape as a whole. The drive module 1 is assembled and completed, and is provided in an electronic device or the like. The drive module 1 can be fixed on the drive module 1 by being fitted on or bonded to a substrate 2 that supplies a control signal or power. .
On the upper surface of the substrate 2, a pair of land portions 3 that are connected to a power supply member of the drive module 1 to be described later and supply electric power, and an image sensor 30 are provided.

As shown in FIGS. 1 and 2, the driving module 1 forms a lens frame 4 (driven body), a lens unit 12 (driven body, see FIG. 1), a module frame 5 (supporting body), and a parallel leaf spring pair. Upper plate spring 6 and lower plate spring 7, module lower plate 8 (support), power supply members 9, 10, shape memory alloy (hereinafter abbreviated as SMA) actuator 40, and cover 11 (cover member) Is a main component, and these components are laminated together to form one actuator.
In the assembled state of these constituent members, as shown in FIG. 3B, the lens frame 4 into which the lens unit 12 is screwed is inserted into the module frame 5, and the upper plate spring 6 and the lower plate spring are inserted. 7 is a state in which the lens frame 4 and the module frame 5 are sandwiched from above and below in the figure and fixed by caulking, and a module lower plate 8 is laminated from below in the figure, and caulked from below the module frame 5. The cover 11 that is fixed together and covers these laminates from above is fixed to the module lower plate 8.
Further, the SMA actuator 40 is sandwiched between the lens frame 4 and the module lower plate 8 via power supply members 9 and 10, respectively.

In addition, the symbol M in the figure is a virtual axis line of the drive module 1 that coincides with the optical axis of the lens unit 12 and indicates the drive direction of the lens frame 4. In the following, for the sake of simplicity of explanation, in the explanation of each disassembled component member, the position and direction may be referred to based on the positional relationship with the axis M at the time of assembly. For example, even when there is no clear circle or cylindrical surface in the component, unless there is a risk of misunderstanding, the direction along the axis M is simply the axial direction, the radial direction of the circle centering on the axis M, and the circumferential direction. It may be simply referred to as a radial direction, a circumferential direction, or a radial direction with respect to the axis M and a circumferential direction.
Further, unless otherwise specified, the vertical direction refers to the vertical direction in the arrangement when the axis M is arranged in the vertical direction and the mounting surface of the drive module 1 is vertically downward.

The lens frame 4 is a member formed in a cylindrical shape as a whole as shown in FIGS. 2 and 3B. A cylindrical housing portion 4A (cylindrical portion) provided coaxially with the axis M is formed at the center of the lens frame 4, and a female screw is formed on the inner peripheral surface 4F thereof. Then, a lens unit 12 (see FIGS. 3B and 5) holding an appropriate lens or lens group held in a lens barrel having an external thread formed on the outer peripheral portion is screwed into the housing portion 4A. It can be done.
In a state where the lens unit 12 is fixed to the lens frame 4, the lens unit 12 and the lens frame 4 constitute a substantially columnar driven body.
As shown in FIG. 2, the outer wall surface 4B of the lens frame 4 is provided with projecting portions 4C projecting radially outward at an angle of 90 degrees in the circumferential direction, and extending in the axial direction. End surfaces 4a and 4b, which are planes orthogonal to the axis M, are formed at the upper and lower ends of each protrusion 4C and in the vicinity thereof (see FIG. 3B). The end surface 4a, the distance between 4b is a H _1. On the end faces 4a and 4b, there are provided four upper fixing pins 13A and four lower fixing pins 13B respectively protruding upward and downward along the axis M.
The upper fixing pin 13A is for holding the upper leaf spring 6, and the lower fixing pin 13B is for holding the lower leaf spring 7.

The positions of the upper fixing pin 13A and the lower fixing pin 13B in plan view may be different from each other, but in the present embodiment, the upper fixing pin 13A and the lower fixing pin 13B are arranged in a positional relationship coaxial with four axes parallel to the axis M. Yes. For this reason, the insertion positions of the upper fixing pin 13A and the lower fixing pin 13B in the upper plate spring 6 and the lower plate spring 7 are made common.
Further, the radial center positions of the upper fixing pin 13A and the lower fixing pin 13B may be different in distance from the axis M, but are arranged on the same circumference in the present embodiment. For this reason, the respective center positions are arranged in a square lattice pattern.

  A guide protrusion 4D (protrusion part) is provided on the radially outer side of the lens frame 4 so as to protrude outward in the radial direction from an intermediate part on the upper end side in the vicinity of one protrusion part 4C. The protruding direction of the guide projection 4D is the angle position in the circumferential direction around the axis M of each upper fixing pin 13A and each lower fixing pin 13B, as shown in FIG. (However, θ is an acute angle). That is, when the guide protrusions 4D are arranged along the square diagonal, the upper fixing pins 13A and the lower fixing pins 13B are all arranged at positions deviated from the square diagonal by a fixed angle θ. It has become.

As shown in FIG. 4, the distal end of the guide protrusion 4D in the radial direction is circular in plan view, and as shown in FIG. 3B, the protrusion lower surface 4g protrudes downward from the inside to the circumference. A frustoconical locking projection 4f is provided.
As for the outer diameter of the locking projection 4f, the distal end portion can be inserted into an inner peripheral portion of a SMA actuator 40 and a through hole 9A of the power feeding member 9, which will be described later, and the SMA actuator 40 and the through hole 9A of the power feeding member 9 at the proximal end portion. The diameter is slightly smaller than the inner diameter. As a result, the through hole 9A and the SMA actuator 40 are inserted into the locking projection 4f in this order from below, so that one end of the SMA actuator 40 is brought into contact with the lower surface of the guide projection 4D via the power supply member 9. Thus, the SMA actuator 40 can be arranged.

As shown in FIGS. 2 and 5, the pair of protrusions 4 </ b> C adjacent in the circumferential direction with respect to the protrusion 4 </ b> C having the guide protrusion 4 </ b> D in the vicinity of the protrusion 4 </ b> C extends along the lower part of the outer wall surface 4 </ b> B of the lens frame 4. A protruding piece-shaped contact portion 4E extending in the circumferential direction from the side portion of each protruding portion 4C is provided.
Each contact portion 4E has a smooth contact surface 4e on its upper surface, and the position of the contact surface 4e in the axial direction is such that the lens frame 4 moves along the axis M upward (in the direction of the arrow (A) in FIG. ) Is set to a position where it abuts against a receiving portion 5E (see FIGS. 2 and 5) per module frame 5 described later.
Further, in the present embodiment, the lens frame 4 is integrally formed with a thermoplastic resin capable of thermal caulking or ultrasonic caulking, such as polycarbonate (PC), liquid crystal polymer (LCP) resin, or the like.

As shown in FIG. 2, the module frame 5 has a substantially rectangular outer shape in plan view, and a housing portion 5 </ b> A (cylindrical portion) including a through hole formed coaxially with the axis M at the center thereof. The lens frame 4 is accommodated in the accommodating portion 5A.
At the upper and lower corners of the module frame 5 are formed end faces 5a and 5b which are planes orthogonal to the axis M, and the upper fixing pin 14A is directed upward from the end face 5a and is lowered downward from the end face 5b. Four side fixing pins 14B are provided.
The upper fixing pin 14A is for holding the upper leaf spring 6, and the lower fixing pin 14B is for holding the lower leaf spring 7 and the module lower plate 8.
The end face 5a, the distance between 5b, the end face 4a of the lens frame 4 is set to a distance H ₁ and the same distance between the 4b (see Figure 3 (b)).

As shown in FIGS. 2 and 4, a tip portion including the locking projection 4 f of the guide projection 4 D can be projected at one corner of the module frame 5, and the SMA actuator 40 can be arranged in the direction along the axis M. A notch portion 5F is provided penetrating in the axial direction.
Further, at one corner where the notch portion 5F is provided and one side surface of the module frame 5 adjacent to this corner, a side notch portion 5G which is notched in a step shape from the end surface 5a and has a substantially rectangular shape in a side view. Is formed.
A power supply member receiving surface 5c, which is a flat surface parallel to the end surface 5a and for attaching the power supply member 9, is formed on the bottom of the side cutout portion 5G in the axial direction. On the power supply member receiving surface 5c, on the side opposite to the notch 5F, a cylindrical locking projection 5d protruding upward is formed to lock the power supply member 9 in the horizontal direction.
On the outer surface of the module frame 5 on the lower side of the side cutout portion 5G, a locking groove portion 5H that locks the wiring portion 9b of the power supply member 9 and positions the wiring portion 9b in the vertical direction is formed. The locking groove portion 5H of the present embodiment has a shape including a groove extending in the vertical direction and a groove extending in the horizontal direction on the lower end side thereof.

The positions of the upper fixing pin 14A and the lower fixing pin 14B in plan view may be different from each other. However, in the present embodiment, the upper fixing pin 14A and the lower fixing pin 14B are arranged in a positional relationship that is coaxial with four axes parallel to the axis M. Yes. For this reason, the insertion positions of the upper fixing pin 14A and the lower fixing pin 14B in the upper leaf spring 6 and the lower leaf spring 7 are made common.
In the present embodiment, in three places excluding the upper fixing pin 14A and the lower fixing pin 14B located in the vicinity of the notch portion 5F, the corners of the module frame 5 are positioned so as to overlap the diagonal lines of the outer shape of the module frame 5. Is provided. The upper fixing pin 14A and the lower fixing pin 14B located in the vicinity of the notch 5F are provided on the side surfaces 5a and 5b that do not have the side notch 5G, respectively.

As shown in FIGS. 2 and 5, the housing 5 </ b> A of the module frame 5 faces radially outward from the inner wall surface 5 </ b> D at two locations facing the contact portion 4 </ b> E of the lens frame 4, and is lower in the axial direction. A contact receiving portion 5E, which is a recess formed from the side to the upper end side intermediate portion, is provided in such a shape that each contact portion 4E of the lens frame 4 can be inserted from below.
The contact receiving portion 5E has a receiving surface 5e that can contact the contact surface 4e of the contact receiving portion 4E on the lower side in the axial direction. Accordingly, when the lens frame 4 moves upward by a predetermined distance along the axis M, the receiving surface 5e of each receiving portion 5E comes into contact with the contacting surface 4e of each receiving portion 4E. The upward movement of the lens frame 4 is restricted. That is, the contact receiving portion 5E constitutes a position restricting portion that restricts the upward movement range of the lens frame 4, and the contact receiving portion 4E is a cover provided so as to be able to contact the position restricting portion of the module frame 5. A position restricting unit is configured.

With such a configuration, even when a large impact is applied from the outside, for example, by dropping the drive module, the lens frame 4 moves upward beyond the position of the receiving surface 5e of the receiving portion 5E. I can't do it.
In this embodiment, such a restriction position is set so that the lens frame 4 does not collide with the cover 11 and the deformation of the upper leaf spring 6 and the lower leaf spring 7 is smaller than, for example, the elastic limit. Yes. In this embodiment, the distance between the contact surface 4e and the receiving surface 5e at the reference position is ΔH (see FIG. 5).
Further, since the contact receiving portion 5E is provided at a position from the center of the housing portion 5A toward the corner of the rectangular outer shape of the module frame 5, in the module frame 5, the corner of the rectangular outer shape from the housing portion 5A. The area in the radial direction up to the portion can be used effectively.
For this reason, even if the receiving portion 5E is provided inside the module frame 5, the outer shape of the module frame 5 can be prevented from increasing, so that the size and weight can be reduced.

  Further, in the present embodiment, the module frame 5 is integrally formed of a thermoplastic resin capable of thermal caulking or ultrasonic caulking, for example, polycarbonate (PC), liquid crystal polymer (LCP) resin, or the like, similarly to the lens frame 4. .

As shown in FIG. 5, the module frame 5 and the lens frame 4 inserted into the module frame 5 are respectively provided with an upper leaf spring on the end surface 5a of the module frame 5 and the end surface 4a of the lens frame 4, respectively. 6, lower leaf springs 7 are laminated on the end surface 5 b of the module frame 5 and the end surface 4 b of the lens frame 4, respectively.
In this embodiment, as shown in FIG. 6, the upper leaf spring 6 and the lower leaf spring 7 are flat plate spring members punched in the same shape, and have a spring property such as a stainless steel (SUS) steel plate, for example. It consists of a metal plate.

As shown in FIG. 6, the shape of the upper leaf spring 6 (lower leaf spring 7) has a substantially rectangular shape in which the outer shape in plan view is the same as the upper (lower) end of the module frame 5. For this reason, one corner of the upper leaf spring 6 (lower leaf spring 7) is provided with a notch 6G (7G) having substantially the same shape corresponding to the notch 5F of the module frame 5. Assuming that the intersections of extending the outline of the upper leaf spring 6 (lower leaf spring 7) are points P1, P2, P3, P4 counterclockwise from the notch 6G (7G) side, the line segment P1P3 , P2P4 is a diagonal line of the outer shape of the upper leaf spring 6 (lower leaf spring 7), and intersects with the axis M.
A circular opening 6C (7C) that is coaxial with the axis M and slightly larger than the inner peripheral surface 4F of the lens frame 4 is formed at the center of the upper leaf spring 6 (lower leaf spring 7). It has a ring shape.
In the vicinity of the three corners of the upper leaf spring 6 (lower leaf spring 7) and the notch 6G (7G), the upper fixing pin formed in the vicinity of the three corners of the module frame 5 and the notch 5F. Corresponding to the arrangement position of 14A (lower fixing pin 14B), four through-holes 6B (7B) that can be respectively inserted into the upper fixing pins 14A (lower fixing pins 14B) are provided. In the present embodiment, the through hole 6B (7B) in the vicinity of the point P4 is a reference circular hole, and the through hole 6B (7B) in the vicinity of the point P2 is an oval hole, and is in a plane perpendicular to the axis M with respect to the module frame 5. Positioning is possible.

Further, the upper plate spring 6 (lower plate spring 7) has upper fixing pins 13A (lower fixing pins) corresponding to the positions of the upper fixing pins 13A (lower fixing pins 13B) formed on the lens frame 4. Four through-holes 6A (7A) that can be respectively inserted into the pins 13B) are provided.
That is, in this embodiment, each through-hole 6A (7A) corresponds to the angular deviation amount θ of the arrangement of the upper fixing pin 13A (lower fixing pin 13B) with respect to the diagonal of the outer shape of the module frame 5 shown in FIG. The line segment L1 (line segment P1M) is formed at a position shifted by an angle θ from an integral multiple of 90 degrees. And the part in which these through-holes 6A (7A) were provided is connected with the circumferential direction by the annular part 6F (7F) along opening 6C (7C).
In this embodiment, by setting the angle θ to an appropriate value in such an arrangement, the diameter of the circle centering on the axis M where the through hole 6A (7A) is located and the through hole 6B (7B) The respective arrangement positions can be set so that the difference in diameter from the circle diameter of the circle centered on the arranged axis M is smaller than that in the case where the angle θ is 0 degrees. .

Further, on the outer side in the radial direction of the opening 6C (7C), four slits 6D extending in a substantially semicircular arc shape in the circumferential direction from a position in the vicinity of the through-hole 6A (7A) opposing each other diagonally across the axis M. (7D) is formed on the outer side in the radial direction of the annular portion 6F (7F) so as to be overlapped in the radial direction by substantially quadrants.
Thereby, four spring parts 6E (7E) extended from the rectangular frame outside the upper leaf | plate spring 6 (lower leaf | plate spring 7) to the substantially quadrant arc shape one each through-hole 6A ( 7A) A leaf spring member extending in the vicinity is formed. That is, a leaf spring member in which the annular portion 6F (7F) is elastically supported uniformly at four locations by the four spring portions 6E (7F) is formed on the rectangular frame.

As shown in FIG. 2, the module lower plate 8 allows the lower fixing pins 14 </ b> B of the module frame 5 to pass through the through holes 7 </ b> B of the lower plate spring 7, and the lower frames of the lens frames 4 housed in the module frame 5. In a state in which the side fixing pin 13B is passed through the through hole 7A of the lower leaf spring 7, the lower leaf spring 7 is stacked between the module frame 5 with the lower leaf spring 7 sandwiched from below, and the rectangular outer shape of the lower leaf spring 7 is obtained. The frame is fixed in close contact with the end surface 5 b of the module frame 5.
The shape of the module lower plate 8 is a plate-like member having a rectangular outer shape that is substantially the same as the outer shape of the module frame 5, and a substantially circular opening 8 </ b> A centering on the axis M penetrates in the center in the thickness direction. Is formed.
The opening 8A is U-shaped in a plan view from the upper surface 8a that extends radially outward to a position corresponding to the position where each lower fixing pin 13B of the lens frame 4 is disposed, and on which the lower leaf spring 7 is laminated. The four recessed parts 8B which are depressed toward the back surface side are formed. Thereby, interference with the caulking portion of the lens frame 4 to be described later can be avoided.
The inner diameter of the circular portion of the opening 8A is equal to or smaller than the inner diameter of the opening 7C of the lower leaf spring 7, and the upper surface 8a is a plane on which the spring portion 7E and the annular portion 7F of the lower leaf spring 7 can abut. Is configured.

Further, the upper surface 8a of the module lower plate 8 is slightly lower than the upper surface 8a from the corner facing the guide protrusion 4D in the assembled state toward the side where the side surface notch 5G of the module frame 5 is provided. A feeding member receiving surface 8f (supporting portion) parallel to the upper surface 8a is provided. On the power supply member receiving surface 8f, a truncated conical locking protrusion 8d is formed at a position facing the notch 5F of the module frame 5 and the locking protrusion 4f of the lens frame 4 in the assembled state. . Further, a locking portion 8e made of a cylindrical protrusion for locking a power supply member 10 described later is provided at a position separated from the locking protrusion 8d.
The step between the power supply member receiving surface 8f and the upper surface 8a is a step larger than the plate thickness of the power supply member 10 so that the power supply member 10 and the lower leaf spring 7 do not contact each other. If necessary, the power supply member 10 is fixed to the module lower plate 8 by adhesion or the like.

As for the outer diameter of the locking projection 8d, the distal end portion can be inserted into an inner peripheral portion of a SMA actuator 40 and a through hole 10A of the power supply member 10 which will be described later, and the SMA actuator 40 and the through hole 10A of the power supply member 10 at the proximal end portion. The size is set so as to be substantially inscribed in the inner peripheral portion. As a result, by inserting the through-hole 10A of the power supply member 10 and the SMA actuator 40 from above into the locking projection 8d in this order, the lower end portion of the SMA actuator 40 is connected to the power supply member of the module lower plate 8 via the power supply member 10. The SMA actuator 40 can be positioned in the circumferential direction with respect to the axis M while being in contact with the receiving surface 8f.
As described above, the power supply member receiving surface 8f in the vicinity of the locking projection 8d constitutes a support portion provided at a position facing the projection of the driven body, and the module lower plate 8 is a cylindrical portion. Together with the module frame 5 having a certain accommodating portion 5A, it constitutes a support.
In addition, through holes 8C through which the lower fixing pins 14B are inserted are formed at the corners located on the periphery of the module lower plate 8 corresponding to the positions of the lower fixing pins 14B of the module frame 5. ing.

  Further, on the lower surface 8b of the module lower plate 8, as shown in FIG. 3B and FIG. 5, a convex portion 8D protruding downward along the opening 8A is formed. The end surface 8c of the convex portion 8D constitutes an attachment surface that comes into contact with the substrate 2 and has a function of a positioning spacer that positions the substrate 2 in the axis M direction, that is, the optical axis direction. The level difference between the end surface 8c and the lower surface 8b of the convex portion 8D is so high that the lower fixing pin 14B protrudes downward from the caulking portion when the lower fixing pin 14B is assembled to the module lower plate 8. Is set.

In the present embodiment, the module lower plate 8 is made of a synthetic resin having electrical insulation.
For this reason, the module lower plate 8 is an insulating member that fixes the power supply member 10 to the substrate 2 in an electrically insulated state.

The power supply member 9 is used to supply the current supplied to the land portion 3 to the upper end side of the SMA actuator 40, and is formed of a pressed metal sheet member. In the present embodiment, as shown in FIG. 2, the locking protrusion 4f of the lens frame 4 is provided at the center of one end of the flexible wiring portion 9c extending linearly in the horizontal direction. An annular feeding portion 9d having a through-hole 9A formed therein is formed, and a through-hole 9B is formed at the other end of the wiring portion 9c to allow the locking projection 5d of the module frame 5 to pass through. The wiring portion 9b is bent, and the tip of the wiring portion 9b is bent in the horizontal direction, so that a terminal portion 9a that can be joined to the land portion 3 is formed.
The power feeding portion 9d has such a size that the upper end portion of the SMA actuator 40 can abut, and the through hole 9A has a larger diameter than the outer diameter of the base end portion of the locking projection 4f.
The wiring portion 9b can be locked in the locking groove portion 5H of the module frame 5, and the position in the vertical direction can be fixed in a state where the wiring portion 9c is in close contact with the power feeding member receiving surface 5c. In the present embodiment, in accordance with the square shape of the locking groove portion 5H, the shape is extended downward from the wiring portion 9c, then bent in the horizontal direction, and extended downward.
The length of the wiring portion 9b is equal to the distance from the power supply member receiving surface 5c of the module frame 5 to the end surface 8c of the convex portion 8D of the module lower plate 8 assembled to the module frame 5.
The connection position of the wiring part 9b to the wiring part 9c is longer than the length to the other end side of the wiring part 9c so that the wiring part 9c can be easily bent between the connection position and the power feeding part 9d. It is set.

The power supply member 10 is for supplying the current supplied to the land portion 3 to the lower end side of the SMA actuator 40, and is formed of a press-worked polygonal metal plate member. In the present embodiment, as shown in FIG. 2, a through-hole through which the locking projection 8d of the module lower plate 8 penetrates to the base end at one end of the wiring portion 10c extending linearly in the horizontal direction. An annular power supply portion 10d formed with 10A is formed, and a through hole 10B through which the locking portion 8e of the module lower plate 8 passes is formed at the other end of the wiring portion 10b, and is bent downward from the other end side. The wiring portion 10b is formed, the tip of the wiring portion 10b is bent in the horizontal direction, and the terminal portion 10a that can be joined to the land portion 3 is formed.
The length of the wiring portion 10b is equal to the distance from the power supply member receiving surface 8f of the module lower plate 8 to the end surface 8c of the convex portion 8D.

  In the present embodiment, as shown in FIG. 4, the terminal portions 9 a and 10 a protrude in parallel radially outward from the side surface of the module frame 5 where the side notch portion 5 </ b> G is provided, As shown to Fig.3 (a), it is provided so that it may protrude from the side wall part 11D of the cover 11. As shown in FIG.

As shown in FIGS. 1 and 2, the cover 11 has a side wall portion 11D extending from the outer edge portion of the upper surface 11E to the lower side so as to cover the module frame 5 so that the module frame 5 can be fitted, and a rectangular opening 11C is formed on the lower side. The circular opening 11A centering on the axis line M is provided in the center part of the upper surface 11E. The size of the opening 11A is set so that the lens unit 12 can be taken in and out.
On the back surface of the upper surface 11E, a concave portion 11B (see FIG. 5) for avoiding interference with projections such as caulking portions formed on the upper surface side of the assembled lens frame 4 is formed.

Thus, the cover 11 has a substantially prismatic outer shape, and the column center is disposed along the axis, thereby surrounding the lens frame 4, the module frame 5, and the SMA actuator 40 from the outside in the radial direction with respect to the axis. It is a cover member. The guide protrusion 4D of the lens frame 4 and the power supply member receiving surface 8f that is a support portion of the support are provided in the vicinity of the column corner portion of the cover 11.
For this reason, the space between the outer periphery of the lens frame 4 and the column corner of the cover 11 is effectively used to dispose the guide protrusion 4D and the power receiving surface 8f, and further to the SMA in the axial space between them. Since the actuator 40 can be disposed, the configuration is compact.

In the present embodiment, the SMA actuator 40 is formed by winding an SMA wire in a coil shape, and the coil length in the phase state on the high temperature side after the transformation is compared with the coil length in the phase state before the transformation start on the low temperature side. The shape is memorized so as to be long.
The inner diameter of the coil of the SMA actuator 40 is set such that the locking protrusion 4f of the guide protrusion 4D and the locking protrusion 8d of the module lower plate 8 can be inserted into the inner periphery. By inserting both end portions into the locking projections 4f and 8d in a state where the power feeding portion 9d of the power feeding member 9 and the power feeding portion 10d of the power feeding member 10 are inserted into the locking projections 4f and 8d, respectively, The protrusion lower surface 4g of the guide protrusion 4D and the power supply member receiving surface 8f of the module lower plate 8 are assembled so as to be urged in the direction along the axis M through 9d and 10d.
As shown in FIG. 3B, the coil length of the SMA actuator 40 at the transformation start temperature on the low temperature side is the power supply member of the projection lower surface 4g of the guide projection 4D in the assembled state and the module lower plate 8. The distance H ₂ is obtained by subtracting the thickness of the power feeding portions 9d and 10 from the distance to the receiving surface 8f. In this embodiment, the length H ₂ is set to a dimension shorter than H ₁ .
Further, at a temperature equal to or higher than the transformation end temperature on the high temperature side, the lens frame 4 is dimensioned so as to be urged to the driving limit where the contact portion 4E contacts the contact portion 5E. For this reason, the shape of the SMA actuator 40 is memorized so as to be equal to or longer than the length (H ₂ + ΔH).

The drive module 1 having such a configuration is assembled in the following procedure.
First, the power supply member 9 is assembled to the module frame 5. That is, the wiring portion 9b is locked to the locking groove portion 5H while the through hole 9B of the power supply member 9 is inserted into the locking projection 5d.
Next, the lens frame 4 is inserted into the housing portion 5A so that the guide protrusion 4D is positioned above the cutout portion 5F of the module frame 5 and the through hole 9A of the power supply member 9, and each end surface 5a of the module frame 5 is inserted. And the end face 4a of the lens frame 4 are aligned at the same height. At this time, the locking protrusion 4f is inserted into the through hole 9A.
Then, the through holes 6A and 6B of the upper leaf spring 6 are inserted into the upper fixing pins 14A of the module frame 5 and the upper fixing pins 13A of the lens frame 4, respectively.
Thereafter, the tip portions of the upper fixing pins 14A and 13A protruding upward through the through holes 6A and 6B of the upper leaf spring 6 are heat caulked by a heater chip (not shown), respectively, and caulking portions 16 and 17 respectively. (See FIGS. 3B, 4 and 5). In the case of using ultrasonic caulking, an ultrasonic vibrator is used instead of the heater chip (the same applies to the following thermal caulking).

Next, the through holes 7A of the lower leaf spring 7 are inserted into the lower fixing pins 13B of the lens frame 4, respectively, and the through holes of the lower leaf spring 7 are inserted into the lower fixing pins 14B of the module frame 5, respectively. Insert 7B. In this state, the tip of each lower fixing pin 13B that protrudes downward through each through-hole 7A of the lower leaf spring 7 is caulked with a heater chip, and the caulking portion 18 (see FIG. 5) is formed. Form.
On the other hand, the through holes 10A and 10B of the power supply member 10 are respectively inserted into the locking protrusions 8d and the locking portions 8e of the module lower plate 8, and the power supply member 10 is disposed on the power supply member receiving surface 8f. The lower end portion of the actuator 40 is inserted into the locking protrusion 8d and placed on the power feeding portion 10d of the power feeding member 10. In this state, the module lower plate 8 is laminated so that each lower fixing pin 14B protruding downward from the lower plate spring 7 is inserted into each through hole 8C of the module lower plate 8. At this time, the upper end portion of the SMA actuator 40 is in a state in which the locking projection 4f is inserted into the inner peripheral portion and the power feeding portion 9d is sandwiched between the lower surface of the guide projection 4D. The caulking portion 18 is not in contact with the module lower plate 8 because the concave portion 8B is formed in the module lower plate 8.
In this assembled state, the lower end portion of each lower fixing pin 14B that protrudes downward through each through-hole 8C is thermally caulked by a heater chip to form a caulking portion 19 (see FIG. 3B). To do.

  In this way, the upper plate spring 6, the lower plate spring 7, and the module lower plate 8 are laminated and fixed to both ends of the lens frame 4 and the module frame 5. At this time, in the no-load state, the spring portions 6E and 7E facing each other of the upper leaf spring 6 and the lower leaf spring 7 are parallel to each other because they do not deform. The annular portion 7F of the lower leaf spring 7 that is in close contact with the end surface 4b is supported in close contact with the upper surface 8a of the module lower plate 8.

Further, the SMA actuator 40 is in a low-temperature phase at the temperature at the time of assembly, and the upper end is in contact with the power supply unit 9d and the lower end is in contact with the power supply unit 10d. Thereby, the electrical continuity state between the SMA actuator 40 and the power feeding members 9 and 10 is realized.
Next, the cover 11 is covered from above and fixed to the module lower plate 8 at the opening portion of the cover 11 opposite to the opening 11A. As a fixing means of the cover 11, an appropriate means can be adopted. For example, an engaging claw or the like is provided on the side wall part 11D and joined by fitting, or the side wall part 11D and the module lower plate 8 are bonded or welded to join.
Thus, the assembly of the drive module 1 is completed.

Next, the drive module 1 is mounted on the substrate 2 by aligning the terminal portions 9a and 10a of the drive module 1 with the land portion 3 (see FIG. 1) on the substrate 2 as necessary. Then, the terminal portions 9a and 10a are electrically connected to the land portion 3 by means such as soldering or conductive adhesive. At this time, the caulking portion 19 is lower than the height of the convex portion 8 </ b> D of the module lower plate 8, so that it is separated from the substrate 2.
For mounting the drive module 1 on the substrate 2, fixing means such as adhesion or fitting can be employed.
The substrate 2 may be an independent member attached to the drive module 1 or a member connected to and disposed on an electronic device or the like.

Next, the lens unit 12 is screwed into the lens frame 4 through the opening 11 </ b> A of the cover 11.
As described above, the lens unit 12 is attached last because the lens of the lens unit 12 is not soiled or dust is attached by the assembling work. For example, the drive module 1 is attached to the lens unit 12. When the product is shipped in a product state where it is attached, or when it is desired to make the opening 11A of the cover 11 smaller than the outer shape of the lens unit 12, for example, when the aperture stop is also used, it is screwed into the lens frame 4 in advance. The above assembly can also be performed.

According to the drive module 1 having such a configuration, the SMA actuator 40 is disposed between the projection lower surface 4g of the guide projection 4D and the power supply member receiving surface 8f of the module lower plate 8 along the drive direction. A compact configuration can be obtained when viewed from the direction.
Further, the SMA actuator 40 is electrically connected by abutting and urging the end portions with respect to the power supply members 9 and 10, so that the assembly becomes easy. In addition, since it is not necessary to caulk the SMA wire, the number of parts is reduced, and an attachment error does not occur in the coil length, and deterioration over time does not occur in the attachment portion.

Next, the operation of the drive module 1 will be described.
The drive module 1 is in a state where the coil length is the shortest because the SMA actuator 40 is in a low-temperature phase state when no power is supplied to the terminal portions 9a and 10a. Therefore, as shown in FIG. 3B, the end surface 4b of the lens frame 4 to which the lens unit 12 is attached is abutted against the upper surface 8a of the module lower plate 8 via the annular portion 7F.
Thereby, the lens frame 4 is positioned at the drive reference position. In the case of the present embodiment, this reference position is set so that the focal position of the lens unit 12 with respect to the image sensor 30 is at infinity.

  When power is supplied to the power supply members 9 and 10 from the terminal portions 9a and 10a, a current flows through the SMA actuator 40. As a result, Joule heat is generated in the SMA actuator 40 and the temperature of the SMA actuator 40 rises. When the transformation start temperature of the SMA actuator 40 is exceeded, the SMA actuator 40 expands toward the coil length stored in the shape memory. To go.

As a result, the guide protrusion 4D is urged upward via the power supply portion 9d, and the lens frame 4 moves upward (in the direction (A) in FIG. 3B) from the reference position with ΔH as a limit (FIG. 3 (b) two-dot chain line reference). At this time, the wiring portion 9c has sufficient flexibility and bends upward following the extension of the SMA actuator 40 with the bent portion of the wiring portion 9b as a fulcrum.
Further, the spring portions 6E and 7E of the upper leaf spring 6 and the lower leaf spring 7 are deformed, respectively, and an elastic restoring force corresponding to the deformation amount is urged to the lens frame 4 via the annular portions 6F and 7F. The At this time, the upper leaf spring 6 and the lower leaf spring 7 are parallel to each other in an unloaded state, and the spring portions 6E and 7E are deformed while maintaining an equal distance in the direction of the axis M, so that a parallel spring is configured. . As a result, the lens frame 4 moves in parallel along the axis M.
The lens frame 4 stops at a position where the elastic restoring force from the upper leaf spring 6 and the lower leaf spring 7 is balanced with the urging force of the SMA actuator 40. Since the urging force from the SMA actuator 40 is determined by the temperature due to Joule heat generation of the SMA actuator 40, that is, the amount of current flowing through the SMA actuator 40, the amount of movement of the lens frame 4 can be changed by changing the amount of current. it can.

Further, when the supply of power is stopped, heat radiation proceeds from the SMA actuator 40. Therefore, the coil is contracted to the coil length before the start of transformation in accordance with the temperature strain characteristics when the SMA is cooled, and the upper leaf spring 6 and the lower leaf spring 7 are contracted. Since the balance position of the force with respect to the lens also changes, the lens frame 4 moves to the balance position in the downward direction (in the (B) direction). In this embodiment, it returns to the reference position as shown in FIG.
Thus, the lens frame 4 can be driven in the direction of the axis M by controlling the power supply amount. Further, when driving to a different position, the power supply is stopped, the lens frame 4 is returned to the reference position, and then the power corresponding to the driving amount is supplied again so that the power can be accurately driven to the different position. .

Thus, in the present embodiment, the lens frame 4 is accurately moved along the axis M by the upper plate spring 6 and the lower plate spring 7 without using an axial guide member that generates a sliding load. be able to. For this reason, the driving load is reduced, the number of parts is reduced, and the configuration can be simplified and downsized.
In addition, the driving range and driving force of the driving module 1 can be easily adjusted by changing the number of turns of the SMA actuator 40, the wire diameter, the coil length for storing the shape, etc. Compared with the case where an SMA wire is used to obtain a driving force, a more compact configuration can be achieved.

[Second Embodiment]
A drive module according to the second embodiment of the present invention will be described.
FIG. 7 is a schematic perspective exploded view showing a schematic configuration of a drive module according to the second embodiment of the present invention. FIG. 8A is a plan view corresponding to the view A of FIG. FIG.8 (b) is typical DD sectional drawing of Fig.8 (a). FIG. 9 is a schematic perspective view showing the internal configuration of the assembled state of the drive module according to the second embodiment of the present invention. FIG. 10 is a plan view of a leaf spring member used in the drive module according to the second embodiment of the present invention.
In some of the drawings, for the sake of clarity, for example, components such as the lens unit 12 are omitted as appropriate.

  The drive module 100 of the present embodiment includes an SMA actuator 140 instead of the SMA actuator 40 of the first embodiment, and as shown in FIG. What is formed, assembled and completed is provided in an electronic device or the like, and can be fixed on the drive module 100 by being fitted on or adhered to the substrate 2 that supplies a control signal and power. Hereinafter, a description will be given centering on differences from the first embodiment.

As shown in FIGS. 1 and 7, the drive module 100 forms a lens frame 104 (driven body), a lens unit 12 (driven body, see FIG. 1), a module frame 105 (support), and a parallel leaf spring pair. The upper plate spring 106 and the lower plate spring 107, the module lower plate 108 (support), the power supply member 110, the SMA actuator 140, and the cover 111 are the main components, and these components are along the axis M. Are integrally laminated to form one actuator.
In the assembled state of these structural members, as shown in FIG. 8B, the lens frame 104 into which the lens unit 12 is screwed is inserted into the module frame 105, and the upper plate spring 106 and the lower plate spring are inserted. Reference numeral 107 denotes a state in which the lens frame 104 and the module frame 105 are sandwiched from above and below in the drawing, and a module lower plate 108 is laminated from the lower side in the drawing and is fixed together by caulking from below the module frame 105. A cover 111 that covers these laminated bodies from above is fixed to the module lower plate 108.
The SMA actuator 140 is housed inside the module frame 105 in a state in which the lens frame 104 is surrounded from the outer peripheral side, and upper and lower end portions are sandwiched between the upper leaf spring 106 and the power supply member 110, respectively.

As shown in FIGS. 7 and 8B, the lens frame 104 is a cylindrical member having an axial length h ₁ in which both axial end faces 104a and 104b are formed by planes orthogonal to the central axis. . A cylindrical housing portion 4A provided coaxially with the axis M is formed at the center of the lens frame 104, and a female screw is formed on the inner peripheral surface 4F thereof. Therefore, the lens unit 12 can be screwed and fixed as in the first embodiment.
In a state where the lens unit 12 is fixed to the lens frame 104, the lens unit 12 and the lens frame 104 constitute a substantially columnar driven body.
In this embodiment, the lens frame 104 is made of a synthetic resin having electrical insulation.

As shown in FIG. 7, the module frame 105 has a substantially rectangular outer shape in plan view, and a housing portion 105 </ b> A (cylindrical portion) including a through hole formed coaxially with the axis M at the center thereof. The end surfaces 105a and 105b are formed of a plane perpendicular to the axis M, and the distance between them is h ₁ .
The lens frame 104 and the SMA actuator 140 can be accommodated in the accommodating portion 105A.
The inner peripheral portion of the accommodating portion 105A has an inner wall surface 105D having an inner diameter slightly larger than the outer diameter of the coil of the SMA actuator 140, and an inner wall surface at a depth h ₂ (where h ₂ <h ₁ ) from the end surface 105a. An annular protrusion 105C that protrudes inward in the radial direction of 105D and has an inner diameter slightly larger than the outer diameter of the lens frame 104 (see FIG. 8B).
On one side of the module frame 105 is in a range of depth h ₂ from the end surface 105a, the slits 105E penetrating from the inner wall surface 105D radially outward is formed.
Next to the slit 105E, a guide groove 105F is formed for guiding a wiring portion 106b of an upper leaf spring 106, which will be described later, downward along the outer surface.

A power supply member 110 is disposed on the upper surface of the protrusion 105C.
The power supply member 110 is for supplying the current supplied to the land portion 3 to the lower end side of the SMA actuator 140, and is made of a pressed metal plate member. As shown in FIG. 7, the power supply member 110 includes an annular portion 110 d that substantially covers the upper surface of the protrusion portion 105 </ b> C, and a strip-shaped wiring portion 110 b that is horizontally projected to the outer peripheral side of the annular portion 110 d and then bent downward. And a terminal portion 110a bent horizontally from the front end portion of the wiring portion 110b toward the radially outer side.
The wiring part 110b and the annular part 110d can be inserted from above into the slit 105E and the accommodating part 105A of the module frame 105, respectively. The wiring portion 110b extends downward along the outer surface of the module frame 105 in a state where the annular portion 110d is placed on the protruding portion 105C. The length of the wiring part 110b in the vertical direction is such a length that the terminal part 110a can contact the land part 3 on the board 2 when the drive module 100 is attached to the board 2 (see FIG. 9).

At the upper and lower corners of the module frame 105, end surfaces 105a and 105b made of a plane orthogonal to the axis M are formed. The upper fixing pin 14A extends downward from the end surface 105a and downwards from the end surface 105b. Four side fixing pins 14B are provided.
The upper fixing pin 14A is for holding the upper leaf spring 106, and the lower fixing pin 14B is for holding the lower leaf spring 107 and the module lower plate 108, respectively.
The distance between the end faces 105a and 105b is set to the same distance as the distance between the end faces 104a and 104b of the lens frame 104 (see FIG. 8B).

The positions of the upper fixing pin 14A and the lower fixing pin 14B in plan view may be different from each other. However, in the present embodiment, the upper fixing pin 14A and the lower fixing pin 14B are arranged in a positional relationship that is coaxial with four axes parallel to the axis M. Yes. For this reason, the insertion positions of the upper fixing pin 14A and the lower fixing pin 14B in the upper leaf spring 106 and the lower leaf spring 107 are made common.
In the present embodiment, both the upper fixing pin 14 </ b> A and the lower fixing pin 14 </ b> B are provided at positions that overlap diagonal lines of the outer shape of the module frame 105 at each corner of the module frame 105.

  The module frame 105 is integrally formed of a thermoplastic resin capable of thermal caulking or ultrasonic caulking, such as polycarbonate (PC) or liquid crystal polymer (LCP) resin.

The SMA actuator 140 differs from the SMA actuator 40 of the first embodiment only in the coil diameter and the coil length.
The coil outer diameter of the SMA actuator 140 is smaller than the inner diameter of the inner wall surface 105 </ b> D of the module frame 5, and the coil inner diameter is larger than the outer diameter of the lens frame 104.
The coil length of the SMA actuator 140 is set to a length h ₂ when no power is supplied. Further, at the transformation end temperature on the high temperature side, the shape is memorized so that the lens frame 104 is extended to a length that can be moved by Δh from the reference position against the upper leaf spring 106 and the lower leaf spring 107.
The SMA actuator 140 is inserted into the housing portion 105A with the lens frame 104 inserted inward and with its lower end in contact with the annular portion 110d of the power feeding member 110 disposed in the housing portion 105A of the module frame 105. Contained. And the upper end part of the SMA actuator 140 is contact | abutted from the upper side to the annular part 106F of the upper leaf | plate spring 106 mentioned later.

As shown in FIG. 8B, the module frame 105 and the lens frame 104 inserted into the module frame 105 are respectively provided with an upper surface and an end surface 105a of the module frame 105 and an end surface 104a of the lens frame 104, respectively. The leaf spring 106 is laminated on the end surface 105b of the module frame 105 and the end surface 104b of the lens frame 104, respectively.
In this embodiment, as shown in FIGS. 7 and 10, the upper leaf spring 106 and the lower leaf spring 107 are leaf spring members having flat plate portions punched in the same shape, and the upper plate spring 106 includes a flat plate portion. The only difference is that a strip-like wiring part 106b extends downward from the end part, and a terminal part 106a is formed that is bent from the lower end of the wiring part 106b to the outside in the radial direction in the horizontal direction.
The length of the wiring portion 106b is set to a length that allows the terminal portion 106a to come into contact with the land portion 3 of the substrate 2 in the assembled state.
The upper leaf spring 106 and the lower leaf spring 107 are made of a metal plate having spring properties such as a SUS steel plate, for example.

As shown in FIGS. 9 and 10, the plan view shape of the upper leaf spring 106 (lower leaf spring 107) has a substantially rectangular shape whose outer shape is the same as the upper (lower) end of the module frame 105.
In addition, an annular portion 106F having a circular opening 106C that is arranged coaxially with the axis M and is slightly larger than the inner peripheral surface 4F of the lens frame 104 is formed at the center of the upper leaf spring 106 (lower leaf spring 107). On the outer peripheral side, an outer peripheral frame portion 106A having a shape that substantially overlaps the end surface 105a (105b) of the module frame 105 is formed, and has a ring shape as a whole.
In this embodiment, the outer diameter of the annular portion 106F is larger than the outer diameter of the lens frame 104, smaller than the inner diameter of the inner wall surface 105D of the module frame 105, and larger than the inner diameter of the SMA actuator 140. Large diameter. The annular portion 106F of the upper leaf spring 106 (lower leaf spring 107) is fixed to the end surface 105a (105b) by appropriate fixing means such as adhesion.

On the radially outer side of the annular portion 106F, there are three slits 106D extending in an arc shape divided into three in the circumferential direction, three concentric arc-shaped spring portions 106E with respect to the annular portion 106F, three slits 106G, and an outer periphery The frame portion 106A is formed in this order.
One end of each spring part 106E is connected to the annular part 106F by three inner support parts 106c extending inward in the radial direction provided at a 120 ° pitch in the circumferential direction. Further, the other end of each spring portion 106E is connected to the outer peripheral frame portion 106A by three outer support portions 106d provided at a 120 ° pitch in the circumferential direction and extending radially outward.
Each inner support portion 106c is adjacent to the outer support portion 106d of the spring portion 106E adjacent in the circumferential direction with a slight gap. Thereby, each slit 106D is connected with the slit 106G adjacent to the circumferential direction by the outer side support part 106d side.
Thus, a leaf spring member is formed in which the annular portion 106F is elastically supported evenly at three locations by the three spring portions 106E with respect to the outer peripheral frame portion 106A.

  Arrangement of upper fixing pins 14A (lower fixing pins 14B) formed in the vicinity of the four corners of the module frame 105 in the vicinity of the corners of the outer peripheral frame portion 106A of the upper leaf spring 106 (lower leaf spring 107). Corresponding to the position, four through holes 106B (107B) that can be inserted through the upper fixing pins 14A (lower fixing pins 14B) are provided. In the present embodiment, a pair of through-holes 106B (107B) facing each other with the axis M therebetween is a reference circular hole and the other is a small hole, and positioning in a plane perpendicular to the axis M with respect to the module frame 105 is possible. It has become.

The module lower plate 108 is connected to the module frame 105 in a state where the lower fixing pins 14B of the module frame 105 are passed through the through holes 106B of the lower plate spring 107, as shown in FIGS. In the meantime, the lower leaf spring 107 is stacked from below, and the outer peripheral frame portion 106A of the lower leaf spring 107 is fixed in close contact with the end surface 105b of the module frame 105.
The shape of the module lower plate 108 is a plate-like member having a rectangular outer shape substantially the same as the outer shape of the module frame 105, and a substantially circular opening 108A centering on the axis M penetrates in the thickness direction in the center. Is formed.
The inner diameter of the opening 108A is smaller than the outer diameter of the lens frame 104 and larger than the inner diameter. For this reason, the upper surface 108a of the module lower plate 108 engages the end surface 104b of the lens frame 104 with the annular portion 106F of the lower plate spring 107 interposed therebetween, and abutment surface that positions the lens frame 104 at the drive reference position. Is configured.

  Further, as shown in FIG. 8B, a convex portion 108D protruding downward along the opening 108A is formed on the lower surface 108b of the module lower plate 108. The end surface 108c of the convex portion 108D constitutes an attachment surface that comes into contact with the substrate 2 and has a function of a positioning spacer that positions the substrate 2 in the axis M direction, that is, the optical axis direction. The level difference between the end surface 108c and the lower surface 108b of the convex portion 108D is such that when the lower fixing pin 14B is assembled by caulking to the module lower plate 108, it protrudes downward from the caulking portion. Is set.

In this embodiment, the module lower plate 108 is made of a synthetic resin having electrical insulation.
For this reason, the module lower plate 108 is an insulating member that fixes the power supply member 110 to the substrate 2 in an electrically insulated state.

As shown in FIGS. 1 and 7, the cover 111 has the same outer shape as the cover 11 of the first embodiment. However, the lens frame 104 of the drive module 100 is not formed with a projection like the caulking portion 17 of the first embodiment on the end surface 104a, so the concave portion 11B on the back surface of the upper surface 11E is deleted. The difference is that it is configured as a box-shaped member having a substantially uniform wall thickness.
The rear surface of the upper surface 11E is separated from the upper leaf spring 106 stacked on the lens frame 104 and the module frame 105 by Δh in the assembled state. For this reason, even if the lens frame 104 attempts to move beyond Δh from the reference position, the movement is blocked by the upper surface 11E.

The drive module 100 having such a configuration is assembled by the following procedure.
First, the power supply member 110 is assembled in the housing portion 105 </ b> A of the module frame 105. That is, the annular portion 110d is placed on the upper surface of the protruding portion 105C with the wiring portion 110b of the power supply member 110 aligned with the slit 105E of the module frame 105.
Then, the SMA actuator 140 is inserted into the housing portion 105A, and the lower end portion is brought into contact with the annular portion 110d.

Next, the lens frame 104 is inserted into the housing portion 105A of the module frame 105, and the lens frame 104 is held at positions where the end surfaces 104a and 104b are aligned with the end surfaces 105a and 105b of the module frame 105, respectively.
Then, the upper leaf spring 106 is laminated from the upper end side. At this time, the wiring portion 106b of the upper leaf spring 106 is disposed along the guide groove 105F of the module frame 105, and the through holes 106B are inserted into the upper fixing pins 14A of the module frame 105. It is arranged and laminated on the end faces 104a and 105a.
Further, the lower leaf spring 107 and the module lower plate 108 are laminated in this order from the lower end side. At this time, the through holes 106B of the lower leaf spring 107 and the through holes 108C of the module lower plate 108 are arranged in a positional relationship to be inserted into the lower fixing pins 14B of the module frame 105, and end faces 104b and 105b. Laminate underneath.

As a result, the end faces 104a and 104b of the lens frame 104 overlap the respective annular portions 106F of the upper leaf spring 106 and the lower leaf spring 107, respectively. In this state, each annular portion 106F is fixed to the end faces 104a and 104b of the lens frame 104 by, for example, adhesion.
Thereafter, the tip of each upper fixing pin 14A protruding upward through each through hole 106B of the upper leaf spring 106 is heat caulked by a heater chip (not shown), and the caulking portions 17 (see FIG. 9) are respectively provided. Form. In the case of using ultrasonic caulking, an ultrasonic vibrator is used instead of the heater chip (the same applies to the following thermal caulking).
Similarly, the tip of each lower fixing pin 13B protruding downward through each through hole 106B in the lower plate spring 107 and each through hole 108C in the module lower plate 108 is heated by the heater chip. Caulking portions (not shown) are formed by crimping.

  In this manner, as shown in FIG. 9, an assembly in which the upper plate spring 106, the lower plate spring 107, and the module lower plate 8 are laminated and fixed is formed at both ends of the lens frame 104 and the module frame 105. At this time, in the no-load state, the spring portions 106E of the upper leaf spring 106 and the lower leaf spring 107 facing each other are parallel to each other because they do not deform. The annular portion 106F of the lower plate spring 107 fixed to the end surface 104b is supported in close contact with the upper surface 108a of the module lower plate 108.

The SMA actuator 140 is in a low-temperature phase at the temperature at the time of assembly. The upper end is an annular portion 106F protruding radially outward from the end surface 104a of the lens frame 104, and the lower end is a circle of the power supply member 110. Each is in contact with the ring portion 110d. Thereby, the electrical connection between the SMA actuator 140, the upper leaf spring 106, and the power feeding member 110 is realized.
Next, the cover 111 is covered and fixed to the module lower plate 108 at the opening on the side opposite to the opening 11 </ b> A of the cover 111. As a fixing means of the cover 111, an appropriate means can be adopted. For example, an engaging claw or the like is provided on the side wall part 11D and joined by fitting, or the side wall part 11D and the module lower plate 108 are bonded or welded to join.
Thus, the assembly of the drive module 100 is completed.

Next, the drive module 100 is mounted on the substrate 2 by aligning the terminal portions 110 a and 106 a of the drive module 100 with the land portion 3 (see FIG. 1) on the substrate 2 as necessary. Then, the terminal portions 110a and 106a are electrically connected to the land portion 3 by means such as soldering or conductive adhesive. At this time, the caulking portion (not shown) formed by caulking the lower fixing pin 14B is lower than the height of the convex portion 108D of the module lower plate 108, and thus is separated from the substrate 2.
For attaching the drive module 100 onto the substrate 2, fixing means such as adhesion and fitting can be employed.

  Next, similarly to the drive module 1 of the first embodiment, the lens unit 12 is screwed and attached into the lens frame 104 through the opening 11 </ b> A of the cover 111. However, as in the drive module 1 of the first embodiment, the above assembly may be performed by screwing into the lens frame 104 in advance.

According to the drive module 100 having such a configuration, the SMA actuator 140 surrounds the outer periphery of the lens frame 104 and is accommodated in the accommodating portion 105A of the module frame 105. Therefore, the SMA actuator 140 is the same as the accommodating portion 105A. The size of the module can be accommodated in the module frame 105. Therefore, it can be set as a compact structure.
Further, since the coil diameter can be made larger than that of the SMA actuator 40 of the first embodiment, the setting of the driving range and the driving force becomes easier.
Further, the SMA actuator 140 is electrically connected by abutting and urging the power supply member 110 and the upper leaf spring 106 to facilitate assembly. In addition, since it is not necessary to caulk the SMA wire, the number of parts is reduced, and an attachment error does not occur in the coil length, and deterioration over time does not occur in the attachment portion.

Next, the operation of the drive module 100 will be described.
FIG. 11 is an explanatory diagram of the operation of the drive module according to the second embodiment of the present invention.
In the state where power is not supplied to the terminal portions 110a and 106a, the drive module 100 is in a state where the coil length is the shortest because the SMA actuator 140 is in a low-temperature phase state. Therefore, as shown in FIG. 8B, the end surface 104b of the lens frame 104 to which the lens unit 12 is attached is abutted against the upper surface 108a of the module lower plate 108 via the annular portion 106F.
As a result, the lens frame 104 is positioned at the drive reference position. In the case of the present embodiment, this reference position is set so that the focal position of the lens unit 12 with respect to the image sensor 30 is at infinity.

  When power is supplied from the terminal portions 110 a and 106 a to the power supply member 110 and the upper leaf spring 106, a current flows through the SMA actuator 140. As a result, Joule heat is generated in the SMA actuator 140 and the temperature of the SMA actuator 140 rises, and when the transformation start temperature of the SMA actuator 140 is exceeded, the SMA actuator 140 expands toward the coil length stored in the shape memory. To go.

As a result, as shown in FIG. 11, the annular portion 106F of the upper leaf spring 106 is urged upward, and the lens frame 104 moves upward (in the direction (A) in FIG. 11) from the reference position by Δh as a limit. Moving.
Further, the spring portions 106E of the upper leaf spring 106 and the lower leaf spring 107 are deformed, and an elastic restoring force corresponding to the amount of deformation is urged to the lens frame 104 via the annular portion 106F. At this time, the upper leaf spring 106 and the lower leaf spring 107 are parallel to each other in an unloaded state, and the spring portions 106E are deformed while maintaining an equal distance in the direction of the axis M. For this reason, the spring part 106E which mutually opposes comprises the parallel spring. As a result, the lens frame 4 moves in parallel along the axis M.
The lens frame 104 stops at a position where the elastic restoring force from the upper leaf spring 106 and the lower leaf spring 107 is balanced with the urging force of the SMA actuator 140. Since the urging force from the SMA actuator 140 is determined by the temperature due to Joule heat generation of the SMA actuator 140, that is, the amount of current flowing through the SMA actuator 140, the amount of movement of the lens frame 104 can be changed by changing the amount of current. it can.

Further, when the supply of power is stopped, heat radiation proceeds from the SMA actuator 140. Therefore, the coil length contracts to the coil length before the start of transformation according to the temperature strain characteristic during cooling of the SMA, and the upper leaf spring 106 and the lower leaf spring 107. Since the balance position of the force with respect to the lens also changes, the lens frame 104 moves to the balance position in the lower direction (the (B) direction in the figure). In this embodiment, it returns to the reference position as shown in FIG.
In this way, the lens frame 104 can be driven in the direction of the axis M by controlling the power supply amount. Further, when driving to a different position, the power supply is stopped, the lens frame 104 is returned to the reference position, and then the power corresponding to the drive amount is supplied again, so that the drive can be accurately performed to the different position. .

As described above, in the present embodiment, the lens frame 104 is accurately moved along the axis M by the upper plate spring 106 and the lower plate spring 107 without using an axial guide member that generates a sliding load. be able to. For this reason, it is possible to reduce the driving load, reduce the number of parts, and reduce the size.
Further, the driving range and driving force of the driving module 100 can be easily adjusted by changing the number of turns of the SMA actuator 140, the wire diameter, the coil length for storing the shape, and the like. Compared with the case where an SMA wire is used to obtain a driving force, a more compact configuration can be achieved.

[Third Embodiment]
Next, an electronic apparatus according to a third embodiment of the present invention will be described.
12A and 12B are perspective external views of the front and back surfaces of an electronic apparatus according to the third embodiment of the present invention. FIG.12 (c) is GG sectional drawing in FIG.12 (b).

A camera-equipped mobile phone 20 according to the present embodiment shown in FIGS. 12A and 12B is an example of an electronic apparatus including the drive module 1 according to the first embodiment.
The camera-equipped mobile phone 20 includes a known mobile phone device configuration inside and outside the cover 22 such as a reception unit 22a, a transmission unit 22b, an operation unit 22c, a liquid crystal display unit 22d, an antenna unit 22e, and a control circuit unit (not shown). ing.
Then, as shown in FIG. 12 (b), a window 22A through which external light is transmitted is provided in the cover 22 on the back surface side on which the liquid crystal display unit 22d is provided, and as shown in FIG. 12 (c), The drive module 1 of the first embodiment is installed so that the opening 11A of the drive module 1 faces the window 22A of the cover 22 and the axis M is along the normal direction of the window 22A.
The drive module 1 is mechanically and electrically connected to the substrate 2.
The substrate 2 is connected to a control circuit unit (not shown) so that power can be supplied to the drive module 1.

According to such a configuration, the light transmitted through the window 22 </ b> A can be collected by the lens unit 12 (not shown) of the drive module 1 and imaged on the image sensor 30. Then, by supplying appropriate power from the control circuit unit to the drive module 1, the lens unit 12 can be driven in the direction of the axis M, and the focal position can be adjusted to perform photographing.
According to such a camera-equipped mobile phone 20, since the drive module 1 of the first embodiment is provided, the device can be downsized and manufactured easily, and even when used in a high-temperature environment, it is accurate. Can be focused.

  In the above description, the example in which the SMA actuator has a coil shape has been described. However, the shape memory is stored so as to extend along the driving direction by self-heating during energization, and both ends in the extending direction are respectively The shape of the SMA actuator is not limited to the coil shape as long as the position of the driving body in the driving direction with respect to the support can be changed by urging the driven body and the support. For example, it is good also as a structure which has a bellows shape.

  In the description of the first embodiment, an example in which one SMA actuator 40 is provided has been described. However, the SMA actuator 40 increases the number of corresponding portions such as the guide protrusion 4D and the power feeding member receiving surface 8f. A plurality of power supply members may be provided by adding appropriate power supply members. For example, one may be provided at each corner in the diagonal direction, or may be provided at all four corners. In this case, since it can drive with the some SMA actuator 40, a driving force can be increased.

  In the description of the second embodiment, the upper plate spring 106 has been described as an example in which the upper plate spring 106 serves as the protrusion of the driven body and the power supply member. However, the upper plate spring 106 does not serve as both. It is good. For example, the protruding portion may be provided with the upper end portion of the lens frame 104 protruding outward in the radial direction, and a power supply member provided separately between the protruding portion and the SMA actuator 140 may be sandwiched.

In the above description, the lens unit 12 is screwed into the lens frames 4 and 104. However, the lens unit 12 may be configured such that the lens frames 4 and 104 also serve as the lens unit 12. Good. In particular, the lens frame 104 of the second embodiment is convenient because it has a cylindrical shape and can be easily used as a lens barrel.
In this case, since the male screw portion and the female screw portion can be deleted from the lens unit 12 and the lens frames 4 and 104, the thickness in the radial direction can be reduced to further reduce the size.

  Further, in the above description, the drive modules 1 and 100 have been described by way of example in the case where they have a substantially quadrangular prism shape. However, by appropriately changing the shapes of the module frames 5 and 105, the covers 11 and 111, and the like, It is good also as external shapes, such as polygonal column shape other than a prism, or a column shape. In the case of a polygonal shape, the column corners can be replaced with polygonal corners.

  Further, in the above description, the case where heat caulking or ultrasonic caulking is used for the assembly has been described. However, the upper fixing pins 13A and 14A, the lower fixing pins 13B and 14B, and the like are replaced with screw portions and screwed. Or may be assembled using an adhesive or the like. In this case, the material of the driven body and the support is not limited to a thermoplastic resin that can be caulked.

  In the above description, an example in which the drive module is used for the focal position adjustment mechanism of the lens unit has been described. However, the use of the drive module is not limited to this. For example, you may use for another part as an appropriate actuator which moves a to-be-driven body to a target position. For example, instead of the lens unit 12, a rod member or the like can be screwed, or the lens frame 4 can be changed to another shape and used as an appropriate actuator.

  In the above description, the example of the camera-equipped mobile phone is described as the electronic device using the drive module, but the type of the electronic device is not limited to this. For example, it may be used for an optical device such as a digital camera or a camera built in a personal computer, or may be used as an actuator for moving a driven body to a target position in an electronic device such as an information reading storage device or a printer.

  In addition, the constituent elements of each of the embodiments described above can be appropriately combined and implemented within the scope of the technical idea of the present invention, if technically possible. For example, the drive module 100 of the second embodiment may be used in place of the drive module 1 in the camera-equipped mobile phone 20 according to the third embodiment.

It is a typical perspective exploded view for demonstrating the attachment state to the board | substrate of the drive module which concerns on the 1st Embodiment of this invention. It is a typical perspective exploded view showing a schematic structure of a drive module concerning a 1st embodiment of the present invention. FIG. 2 is a plan view of FIG. 1 and a schematic BB cross-sectional view thereof. It is a typical perspective view which shows the internal structure of the assembly state of the drive module which concerns on the 1st Embodiment of this invention. It is sectional drawing which follows the CC line in FIG. It is a top view of the leaf | plate spring member used for the drive module which concerns on the 1st Embodiment of this invention. It is a typical perspective exploded view showing a schematic structure of a drive module concerning a 2nd embodiment of the present invention. It is the top view equivalent to the A view of FIG. 1, and its typical DD sectional drawing. It is a typical perspective view which shows the internal structure of the assembly state of the drive module which concerns on the 2nd Embodiment of this invention. It is a top view of the leaf | plate spring member used for the drive module which concerns on the 2nd Embodiment of this invention. It is operation | movement explanatory drawing of the drive module which concerns on the 2nd Embodiment of this invention. FIG. 6 is a perspective external view of the front and back surfaces of an electronic apparatus according to a third embodiment of the present invention, and a GG cross-sectional view thereof.

Explanation of symbols

1, 100 Drive module 2 Substrate 4, 104 Lens frame (driven body)
4D guide protrusion (protrusion)
4f Locking projection 4g Projection lower surface 5, 105 Module frame (support)
5A, 105A Housing part (tubular part)
6 Upper leaf spring (parallel leaf spring pair)
7, 107 Lower leaf spring (parallel leaf spring pair)
8,108 Module lower plate (support)
8f Feeding member receiving surface (supporting part)
9, 10, 110 Power supply member 11 Cover (cover member)
12 Lens unit (driven body)
20 Mobile phone with camera (electronic equipment)
40, 140 Shape memory alloy (SMA) actuator 106 Upper leaf spring (parallel leaf spring pair, power supply member)
111 Cover 111
M axis

Claims (7)

A driven body composed of a substantially columnar body arranged such that the axis is along the driving direction;
A support having a cylindrical portion for accommodating the driven body movably along the driving direction;
The driven body and the support body are attached so as to extend in a direction perpendicular to the driving direction, and are arranged so as to be parallel to each other in an unloaded state, and the driven body is placed in the driving direction. A pair of parallel leaf springs movably supported;
A power supply member for supplying current from the outside;
The shape is memorized so as to extend along the drive direction by self-heating when the current supplied from the power supply member is energized, and both ends in the extension direction are respectively connected to the power supply member. A drive module comprising: a shape memory alloy actuator that changes a position of the driven body in the drive direction relative to the support body by urging the drive body and the support body.   The drive module according to claim 1, wherein the shape memory alloy actuator has a coil shape wound around the drive direction. The driven body is provided with a protrusion protruding outward in the radial direction of the columnar body,
The support body is provided with a support portion at a position facing the protrusion of the driven body,
3. The drive module according to claim 1, wherein the shape memory alloy actuator is disposed along the drive direction between a protrusion of the driven body and the support of the support. . A cover member that surrounds the driven body, the support body, and the shape memory alloy actuator from the outer side in the radial direction with respect to the axis line by having an outer shape of a substantially prismatic shape and a column center disposed along the axis line. Prepared,
The drive module according to claim 3, wherein the protruding portion of the driven body and the support portion of the support body are provided in the vicinity of a column corner portion of the cover member. The protrusion of the driven body and the support of the support are provided inside a cylindrical portion of the support,
The drive module according to claim 3, wherein the shape memory alloy actuator is formed in a shape that is accommodated in the cylindrical portion of the support body and surrounds an outer periphery of the driven body. One of the parallel leaf spring pairs is fixed to the driven body,
The drive module according to claim 5, wherein a portion of the parallel spring pair fixed to the driven body also serves as the protrusion of the driven body.   An electronic apparatus comprising the drive module according to claim 1.

Images