JP2011078150A - Linear drive device and optical element drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear drive device, along with an optical element drive device, wherein a movable member has a stable posture even if employing a system for inserting a guiding shaft of a stator side into a through-hole of the movable member and driving the movable member by a magnetic driving mechanism. <P>SOLUTION: In the optical element drive device and the linear drive device, the movable member 5 supported by a first guiding shaft 41 and a second guiding shaft 42 is linearly driven by the magnetic drive mechanism. The movable member 5 is supported at an original position by a first spring member 91 provided around the first guiding shaft 41 and a second spring member 92 provided around the second guiding shaft 42. The first spring member 91 and the second spring member 92 generate a side pressure for allowing a first bearing 512, a second bearing 522, and a third bearing 523 to contact the inner wall of the through-hole. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a linear drive device that linearly moves a movable body relative to a fixed body, and an optical element drive device that includes the linear drive device.

  As a linear drive device (linear motor) used in an optical element drive device or the like for linearly reciprocating a movable body holding an optical element such as a zoom lens or a collimator lens, one using a stepping motor can be cited ( Patent Document 1).

JP-A-6-281852

  However, the linear drive device (optical element drive device) using the stepping motor described in Patent Document 1 has a problem that it is difficult to reduce the size.

  Here, the inventor passes a guide shaft extending in the moving direction of the movable body on the fixed body side through the penetrating portion of the movable body, and provides a magnet provided on one of the movable body and the fixed body, and the other. The present invention proposes a method of driving a movable body by a magnetic drive mechanism facing a provided coil. However, in the case of such a method, there is a problem that the posture of the movable body is not stabilized due to a gap interposed between the penetrating portion of the movable body and the guide shaft of the fixed body, and the movable body is shaken.

  In view of the above problems, the problem of the present invention is that the posture of the movable body is stable even when a system in which the guide shaft on the fixed body side is passed through the penetrating portion of the movable body and the movable body is driven by a magnetic drive mechanism is adopted. It is an object of the present invention to provide a linear driving device and an optical element driving device including the linear driving device.

  In order to solve the above-described problems, the present invention provides a linear drive device that linearly moves a movable body relative to a fixed body, and the fixed body is attached to multiple poles along a moving direction of the movable body. A permanent magnet body magnetized, and a guide shaft extending along a moving direction of the movable body, the movable body facing the permanent magnet body with a gap therebetween, and the permanent magnet A driving coil that constitutes a body and a magnetic drive mechanism, and a penetrating portion that engages with the guide shaft, and intersects the axial direction of the guide shaft between the fixed body and the movable body. A spring member for applying a lateral force in the direction to the movable body is provided.

  In the present invention, in order to linearly reciprocate the movable body with respect to the fixed body, a magnetic drive mechanism including a permanent magnet body on the fixed body side and a drive coil on the movable body side is used. Can be achieved. In addition, since the fixed body includes a guide shaft that engages with the penetrating portion of the movable body, the movable body is driven by the magnetic drive mechanism while being supported by the guide shaft. Here, there is at least a gap corresponding to the clearance between the guide shaft and the penetrating portion. In the present invention, the movable body is applied with a lateral pressure in a direction intersecting the moving direction by the spring member. Yes. For this reason, since the guide shaft reliably contacts the inner wall of the penetrating portion, the movable body can be driven in a stable posture, and the occurrence of blurring in the movable body can be avoided.

  In the present invention, it is preferable that the fixed body includes a first guide shaft and a second guide shaft provided on both sides of the movable body as the guide shaft. By adopting such a configuration, the movable body can be supported by the two guide shafts, so that the movable body can be held in a stable posture.

  In the present invention, between the fixed body and the movable body, as the spring member, a first spring member that biases the movable body in the moving direction, and the first spring member with respect to the first spring member A second spring member that urges the movable body in a direction opposite to the first spring member at a position shifted in a direction crossing the moving direction, and the movable body supplies power to the drive coil. It is preferable that the first spring member and the second spring member be held at the origin position during the period when the spring is stopped. According to such a configuration, the movable body can be held at the origin position while the power supply to the drive coil is stopped. Moreover, the movable body can be stopped at a predetermined position by controlling the current value energized to the drive coil and the spring constants of the first spring member and the second spring member. Further, since the first spring member and the second spring member urge the movable body at a position shifted in a direction intersecting the moving direction, a lateral pressure is applied to the movable body so as to rotate the movable body. Is done. For this reason, the first spring member and the second spring member for holding the movable body at the origin position can be used as they are to generate the side pressure, and a dedicated spring member for generating the side pressure is not required. Further, since a lateral pressure is applied to rotate the movable body, each of the first guide shaft and the second guide shaft comes into contact with the inner wall of the penetrating portion of the movable body, so that the movable body is held in a stable posture. be able to.

  In the present invention, for example, the first spring member is a first coil spring, and the second spring member is a second coil spring. If it is a coil spring, it expands and contracts following the movement of the movable body, which is convenient for energizing the movable body even if the movable body moves.

  In the present invention, the first coil spring is provided on one side of the moving direction with respect to the movable body around the first guide shaft, and the second coil spring is disposed around the second guide shaft in the movable body. Is preferably provided on the other side in the moving direction. According to such a configuration, it is not necessary to separately secure a place for providing the spring member (the first coil spring and the second coil spring). Therefore, the linear drive device can be reduced in size and thickness.

  In this invention, it is preferable that the said spring member is electrically connected to the coil | winding of the said drive coil, and is used as an electric power feeding member to the said drive coil. According to such a configuration, it is not necessary to separately provide a power supply member, and thus the linear drive device can be reduced in size and thickness.

  The linear drive device to which the present invention is applied can be used for an optical element drive device. In this case, the movable body is configured to hold an optical element.

  In the present invention, in order to linearly reciprocate the movable body with respect to the fixed body, a magnetic drive mechanism including a permanent magnet body on the fixed body side and a drive coil on the movable body side is used. Can be achieved. In addition, since the fixed body includes a guide shaft that engages with the penetrating portion of the movable body, the movable body is driven by the magnetic drive mechanism while being supported by the guide shaft. Here, there is at least a gap corresponding to the clearance between the guide shaft and the penetrating portion. In the present invention, the movable body is applied with a lateral pressure in a direction intersecting the moving direction by the spring member. Yes. For this reason, since the guide shaft reliably contacts the inner wall of the penetrating portion, the movable body can be driven in a stable posture, and the occurrence of blurring in the movable body can be avoided.

It is explanatory drawing which shows the whole structure of the optical element drive device to which this invention is applied. It is a disassembled perspective view which shows the state which isolate | separated the optical element drive device to which this invention is applied into the fixed body and the movable body. It is explanatory drawing of the member which comprises a movable body in the optical element drive device to which this invention is applied. It is sectional drawing which shows the internal structure of the optical element drive device to which this invention is applied. It is explanatory drawing of the protrusion part for positioning formed in the fixed body of the optical element drive device and linear drive device to which this invention is applied. It is explanatory drawing of the stopper part provided in the protrusion for positioning shown in FIG. It is explanatory drawing which shows the contact state of a guide shaft and the inner wall of a penetration part in the optical element drive device to which this invention is applied.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, the case where the linear drive device to which the present invention is applied is used for an optical element drive device will be mainly described. In the following description, three directions orthogonal to each other will be described as an X-axis direction, a Y-axis direction, and a Z-axis direction, and the X-axis direction will be described as a moving direction of the movable body.

(Overall configuration of optical element driving device)
FIG. 1 is an explanatory diagram showing the overall configuration of an optical element driving apparatus to which the present invention is applied. FIGS. 1A and 1B are a perspective view of an optical element driving apparatus to which the present invention is applied, and an optical device, respectively. It is a perspective view of the state which removed the cover from the element drive device.

  The optical element driving apparatus 200 shown in FIG. 1 includes a linear driving apparatus 100 that linearly reciprocates the movable body 5 along the X-axis direction (movement direction L) with respect to the fixed body 2. Holds an optical element 1 (driven member). In the optical element driving apparatus 200, when the movable body 5 is linearly driven in the linear driving apparatus 100, the optical element 1 is linearly driven together with the movable body 5. The optical element 1 is a lens, a deflection mirror, or the like constituting an optical system in an optical unit in which the optical element driving device 200 is mounted, and has an optical axis directed in the X-axis direction. Here, when the optical element 1 has a function of correcting the optical characteristics of the optical unit, the linear drive device 100 and the optical element drive device 200 reliably hold the state where the optical element 1 is stopped at a predetermined position in the optical axis direction. There is a need to.

  In the linear drive device 100, the fixed body 2 includes a base 20 (yoke) obtained by bending a thin plate into a predetermined shape, a guide shaft held so as to extend in the X-axis direction with respect to the base 20, and a plate-like cover. 30 and a permanent magnet body 70 to be described later. In this embodiment, three guide shafts (first guide shaft 41, second guide shaft 42, and third guide shaft 43) are used as guide shafts. The base 20 includes a bottom plate portion 21 and four side plate portions 22, 23, 24, 25 that stand upward from the bottom plate portion 21 (Y-axis direction). A cover 30 is fixed to the upper end.

(Detailed configuration of fixed body 2)
FIG. 2 is an exploded perspective view showing a state where the optical element driving device to which the present invention is applied is separated into a fixed body and a movable body.

  As shown in FIGS. 1 and 2, in the base 20, a pair of side plate portions 22, 23 facing in the X-axis direction on one side in the Z-axis direction are spring members (first spring member 91 and second spring described later). It is configured as a fixed body side spring receiving portion for receiving the member 92). Two holes 22a and 22b are formed in the side plate portion 22 at positions spaced apart in the Z-axis direction, and the two holes 23a and 23b are formed in the side plate portion 23 at positions spaced apart in the Z-axis direction. Yes. The hole 22a and the hole 23a are opposed to each other in the X-axis direction, and the shaft guide portion of the first guide shaft 41 is fitted into the holes 22a and 23a. Is retained. Further, the hole 22b and the hole 23b are opposed to each other in the X-axis direction, and the shaft guide portion of the second guide shaft 42 is fitted into the holes 22b and 23b. 23. Further, the pair of side plate portions 24 and 25 facing in the X-axis direction on the other side in the Z-axis direction are also formed with holes 24a and 25a at positions facing each other, and the shaft end portion of the third guide shaft 43 is By fitting into the holes 24 a and 25 a, both end portions of the third guide shaft 43 are held by the side plate portions 22, 23, 24 and 25. In this manner, in the present embodiment, the first guide shaft 41, the second guide shaft 42, and the third guide shaft 43 are arranged in parallel from one side to the other side in the Z-axis direction. 41, the second guide shaft 42, and the third guide shaft 43 are at the same height from the bottom plate portion 21 of the base 20.

(Detailed configuration of movable body 5)
FIG. 3 is an explanatory diagram of members constituting the movable body in the optical element driving apparatus to which the present invention is applied. FIGS. 3A and 3B are respectively movable bodies in the optical element driving apparatus to which the present invention is applied. FIG. 2 is an exploded perspective view showing a state where a drive coil is removed from the motor, and an exploded perspective view showing a state in which a movable body is further finely disassembled.

  As shown in FIGS. 1, 2, and 3, the movable body 5 includes a rectangular cylindrical drive coil 80, which will be described later, and when the drive coil 80 is cut in a direction orthogonal to the moving direction L. The cross-sectional shape includes a pair of short sides 80a and 80b opposed in the Z-axis direction and a pair of long sides 80c and 80d opposed in the Y-axis direction.

  In the movable body 5, the first holder member 51 (bearing member) is provided on one side in the Z-axis direction outside the drive coil 80, and the first holder member 51 is connected to the Z-axis on the other side in the Z-axis direction. The 2nd holder member 52 (bearing member) which opposes in a direction is provided. The first holder member 51 and the second holder member 52 are made of a nonmagnetic material such as resin. The first holder member 51 and the second holder member 52 extend in the movement direction along the wall surfaces corresponding to the short sides 80 a and 80 b in the outer peripheral surface of the drive coil 80.

  The first holder member 51 includes a plate-like portion 511 that extends in the X-axis direction, and a first bearing portion that protrudes from the approximate center position of the plate-like portion 511 in the X-axis direction to one side (outside) in the Z-axis direction. 512. The first bearing portion 512 includes a groove-like portion 512a (penetrating portion) that penetrates in the X-axis direction and a slit portion that reaches the groove-like portion 512a from one side (outside) of the first bearing portion 512 in the Z-axis direction. It is formed in a U-shaped groove shape. A first guide shaft 41 as a sub shaft passes through the groove-like portion 512a in the X-axis direction.

  The second holder member 52 includes a plate-like portion 521 that extends in the X-axis direction, a second bearing portion 522 that protrudes outward in the Z-axis direction from one side end portion of the plate-like portion 521 in the X-axis direction, The plate-like portion 521 includes a third bearing portion 523 that protrudes outward in the Z-axis direction from the other end portion that is separated from the second bearing portion 522 in the X-axis direction, and includes the second bearing portion 522 and the third bearing. The part 523 is opposed to the part 523 in the X-axis direction with a predetermined distance. In the second bearing portion 522 and the third bearing portion 523, through holes 522a and 523a (penetrating portions) penetrating in the X axis direction are formed at positions overlapping when viewed from the X axis direction, and the through holes 522a and 523a are formed. The second guide shaft 42 with the main shaft extending therethrough passes therethrough.

  The second holder member 52 includes a rod-shaped element holding portion 524 on the distal end side of the third bearing portion 523. In the element holding portion 524, an element holding concave portion 525 (member holding portion) penetrating in the X axis direction is formed at a substantially central portion in the Z axis direction, and the optical element 1 is disposed inside the element holding concave portion 525. Is held. A through hole 524a including a hole penetrating in the X-axis direction is formed at the tip of the element holding portion 524, and the third guide shaft 43 passes through the through hole 524a.

  The movable body 5 has a substantially rectangular tube shape having an opening in the X-axis direction (movement direction L). The movable body 5 includes a first reinforcing member 61 on one side in the Z-axis direction on the inner side of the drive coil 80, and a first facing the first reinforcing member 61 in the Z-axis direction on the other side in the Z-axis direction. Two reinforcing members 62 are provided. The first reinforcing member 61 and the second reinforcing member 62 extend in the moving direction L along the wall surfaces corresponding to the short sides 80 a and 80 b of the inner peripheral surface of the drive coil 80. The first reinforcing member 61 and the second reinforcing member 62 are made of a nonmagnetic material such as resin.

  End portions 611 and 612 on both sides in the X-axis direction of the first reinforcing member 61 protrude from the both end portions of the drive coil 80 in the moving direction L, respectively. Further, the end portions 611 and 612 are bent outward in the Z-axis direction so as to overlap both end portions of the plate-like portion 511 of the first holder member 51 in the X-axis direction, and both ends of the plate-like portion 511 in the X-axis direction. Bonded to the part. Therefore, even if the first holder member 51 and the first reinforcing member 61 are not bonded to the drive coil 80, the plate of the first holder member 51 is sandwiched between the portions corresponding to the short sides 80a of the drive coil 80. The end portion of the shape portion 511 and the end portions 611 and 612 of the first reinforcing member 61 are connected to each other.

  Similarly, end portions 621 and 622 on both sides in the X-axis direction of the second reinforcing member 62 protrude from the both end portions of the drive coil 80 in the moving direction L. Further, the end portions 621 and 622 are bent outward in the Z-axis direction so as to overlap both end portions of the plate-like portion 521 of the second holder member 52 in the X-axis direction, and both ends of the plate-like portion 521 in the X-axis direction. Bonded to the part. Therefore, even if the second holder member 52 and the second reinforcing member 62 are not bonded to the drive coil 80, the plate of the second holder member 52 is sandwiched between the portions corresponding to the short sides 80b of the drive coil 80. The end of the shaped part 521 and the second reinforcing member 62 are connected.

(Configuration of magnetic drive mechanism)
FIG. 4 is a cross-sectional view showing an internal configuration of an optical element driving apparatus to which the present invention is applied. FIGS. 4A and 4B show an optical element driving apparatus to which the present invention is applied, respectively. It is sectional drawing when cut | disconnecting in the position shown by X1-X1 ', and sectional drawing when cut | disconnecting in the position shown by Z1-Z1' of Fig.1 (a).

  In driving the movable body 5 in the X-axis direction (optical axis direction) in the optical element driving device 200 and the linear driving device 100 of the present embodiment, the present embodiment will be described below with reference to FIGS. In addition, between the fixed body 2 and the movable body 5, a permanent magnet body 70 on the fixed body 2 side and a drive coil 80 on the movable body 5 side having a gap between the permanent magnet body 70 are provided. A magnetic drive mechanism 7 is configured.

  In the magnetic drive mechanism 7, the permanent magnet body 70 has a thin rectangular parallelepiped shape (rectangular plate shape) in the Y-axis direction (thickness direction) as shown in FIGS. Both end portions in the axial direction are fixed to the side plate portions 22 and 23 of the base 20 used for the fixed body 2. In this state, the permanent magnet body 70 is floating in the Y-axis direction from the bottom plate portion 21 of the base 20, and a gap is interposed between the permanent magnet body 70 and the bottom plate portion 21 of the base 20. Further, a gap is interposed between the permanent magnet body 70 and the cover 30.

  Here, the permanent magnet body 70 is magnetized in multiple poles along the X-axis direction (movement direction L of the movable body 5). Further, the permanent magnet body 70 includes a plurality of magnet pieces arranged along the X-axis direction, and the plurality of magnet pieces are arranged such that adjacent magnet pieces face the same pole toward the other magnet piece. Has been. More specifically, the permanent magnet body 70 includes two magnet pieces (a first magnet piece 71 and a second magnet piece 72), and the first magnet piece 71 and the second magnet piece 72 have the same pole (for example, N pole) is facing the other side. A thin magnetic plate 75 is disposed between the first magnet piece 71 and the second magnet piece 72. The size of the magnetic plate 75 is the same as the size of the first magnet piece 71 and the second magnet piece 72 in the YZ plane. For this reason, the permanent magnet body 70 includes the first magnet piece 71, the magnetic plate 75, and the second magnet piece 72, but has an integral rectangular parallelepiped shape as a whole.

  In the permanent magnet body 70 having such a configuration, the magnetic plates 75 are arranged on the end surfaces of the first magnet pieces 71 and the second magnet pieces 72, so that the magnetic plates 75 are arranged from the first magnet pieces 71 and the second magnet pieces 72. Magnetic field lines are generated by concentrating on the side where is located. Further, since the first magnet piece 71 and the second magnet piece 72 have the same pole (for example, N pole) facing the other side, the efficiency is improved from the magnetic plate 75 toward the periphery (Y-axis direction and Z-axis direction). Magnetic field lines are often generated.

  As shown in FIGS. 1 to 4, the drive coil 80 used in the magnetic drive mechanism 7 is a rectangular tube-shaped voice coil facing the opening in the X-axis direction, and the permanent magnet body 70 is placed inside the drive coil 80. Is arranged. For this reason, the drive coil 80 passes through the gap interposed between the permanent magnet body 70 and the bottom plate portion 21 of the base 20 and the gap interposed between the permanent magnet body 70 and the cover 30. Both ends of the permanent magnet body 70 in the X-axis direction protrude outward from the opening facing the X-axis direction in the drive coil 80.

  In this state, the base 20 and the cover 30 cover the drive coil 80 on the side opposite to the permanent magnet body 70 with respect to the drive coil 80. In this embodiment, the base 20 and the cover 30 are made of a magnetic plate, and the base 20 and the cover 30 are used as a housing for the optical element driving device 200 and the linear driving device 100 and also as a yoke. In this embodiment, when the base 20 and the cover 30 are used as a yoke, the dimensions of the base 20 and the cover 30 in the Z-axis direction are larger than the dimensions of the permanent magnet body 70 in the Z-axis direction. When the plane 70 is viewed in plan, the base 20 and the cover 30 protrude from both sides in the Z-axis direction from the permanent magnet body 70. For this reason, since the base 20 and the cover 30 are excellent in the function as a yoke, the plate | board thickness of the base 20 and the cover 30 can be made thin. In addition, the side plate portions 22 and 23 of the base 20 support both shaft end portions of the first guide shaft 41 and the second guide shaft 42 by using portions protruding from both sides in the Z-axis direction from the permanent magnet body 70. ing. For this reason, there exists an advantage that it is not necessary to add the member for supporting the 1st guide shaft 41 and the 2nd guide shaft 42 separately.

  In this embodiment, the drive coil 80 is wound around the first reinforcing member 61 and the second reinforcing member 62 in the movable body 5. More specifically, the drive coil 80 is formed at both ends of the first reinforcing member 61 at portions sandwiched between the end 611 and the end 612 that are bent in the Z-axis direction, and at both ends of the second reinforcing member 62. It is wound around a portion sandwiched between an end 621 and an end 622 that are bent in the Z-axis direction. In this state, the first reinforcing member 61 and the second reinforcing member 62 are located inside the drive coil 80, and portions corresponding to the short sides 80a and 80b located in the Z-axis direction in the drive coil 80 are the first reinforcement. The member 61 and the second reinforcing member 62 are reinforced.

  A gap is interposed between the drive coil 80 and the permanent magnet body 70 in the Z-axis direction, and the first reinforcing member 61 or the second reinforcing member 62 is placed in the gap. To position. On the other hand, a narrow gap exists between the drive coil 80 and the permanent magnet body 70 in the Y-axis direction, and the first reinforcing member 61 and the second reinforcing member 62 are not interposed. . For this reason, in the Y-axis direction, since the drive coil 80 and the permanent magnet body 70 can be brought closer, the magnetic flux density interlinking the drive coil 80 can be increased.

  In this embodiment, when the drive coil 80 is formed, the first reinforcing member 61 and the second reinforcing member 62 are used as coil bobbins. That is, a portion sandwiched between the end portions 611 and 621 in the first reinforcing member 61 in a state where the first reinforcing member 61 and the second reinforcing member 62 are held by the jig so as to face each other with a predetermined gap therebetween, and A coil wire is wound around a portion of the second reinforcing member 62 sandwiched between the end portions 621 and 622 to form the drive coil 80.

  After that, if the first holder member 51 is fixed to the end portions 611 and 612 of the first reinforcing member 61 and the second holder member 52 is fixed to the end portions 621 and 622 of the second reinforcing member 62, The movable body 5 can be assembled. In the movable body 5, when the first bearing portion 512 for bearing is provided on one side in the Z-axis direction of the movable body 5, the Z axis of the drive coil 80 is passed through the end portions 611 and 612 of the first reinforcing member 61. The structure which attached the 1st holder member 51 to the side surface of the one side of a direction is employ | adopted. Further, in this embodiment, when the first bearing portion 522 and the third bearing portion 523 are provided on the other side of the movable body 5 in the Z-axis direction, the drive coil 80 is connected via the end portions 621 and 622 of the second reinforcing member 62. A structure in which the second holder member 52 is attached to the other side surface in the Z-axis direction is employed.

(Positioning structure of permanent magnet body 70 and configuration of stopper)
FIG. 5 is an explanatory view of a positioning protrusion formed on a fixed body of an optical element driving device and a linear driving device to which the present invention is applied. FIGS. 5A and 5B are permanent views formed on a base 20. It is explanatory drawing of the protrusion for positioning for magnet body positioning, and explanatory drawing which expands and shows the protrusion for positioning. 6 is an explanatory diagram of the stopper provided on the positioning protrusion shown in FIG. 5, and FIGS. 6A and 6B are an explanatory diagram showing a planar configuration of the stopper and the positioning protrusion. It is explanatory drawing when seeing from the element holding | maintenance part side.

  As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, in the optical element driving device 200 and the linear driving device 100 of this embodiment, the side plate portion of the base 20 used for the fixed body 2 is used. 22, a positioning protrusion 221 is formed at a substantially central portion in the Z-axis direction by cutting and raising a part of the side plate portion 22 toward the side plate portion 23. In the side plate portion 23, a substantially central portion in the Z-axis direction. A positioning projection 231 is formed by cutting and raising a part of the side plate portion 23 toward the side plate portion 22. Here, each of the positioning protrusions 221 and 231 includes horizontal plate portions 221a and 231a at predetermined height positions from the bottom plate portion 21, and the X of the permanent magnet body 70 is placed on the horizontal plate portions 221a and 231a. The axial end is positioned and glued. For this reason, the permanent magnet body 70 is in a state of floating by a predetermined dimension from the bottom plate portion 21.

  In addition, on one side of the side plate portion 22 of the base 20 in the Z-axis direction, a positioning protrusion 222 is formed by cutting and raising a part of the side plate portion 22 toward the side plate portion 23 in an L shape. On one side of the part 23 in the Z-axis direction, a positioning protrusion 232 is formed by cutting and raising a part of the side plate part 23 toward the side plate part 22 in an L shape. Here, each of the positioning protrusions 222 and 232 includes vertical plate portions 222a and 232a oriented in the Z-axis direction at predetermined height positions from the bottom plate portion 21, and permanent magnets are provided on the vertical plate portions 222a and 232a. The end surface in the Z-axis direction of the body 70 is positioned and bonded. For this reason, the position of the permanent magnet body 70 in the Z-axis direction is defined by the vertical plate portions 222a and 232a of the positioning protrusions 222 and 232.

  Here, the positioning protrusions 222 and 232 are respectively provided with stopper portions 222b and 232b made of vertical plate portions facing each other in the movement direction L. Of the stopper portions 222 b and 232 b, the stopper portion 222 b faces one end 621 of the second reinforcing member 62 of the movable body 5 in the moving direction L, and the stopper portion 232 b is the other end of the second reinforcing member 62 of the movable body 5. It faces the end portion 622 in the moving direction L. For this reason, when the movable body 5 moves to the side plate portion 22 side, the stopper portion 222b comes into contact with the end portion 621 of the second reinforcing member 62 (a place where the drive coil 80 is avoided in the movable body 5). Prevent further movement of 5. When the movable body 5 moves to the side plate portion 23 side, the stopper portion 232b comes into contact with the end portion 622 of the second reinforcing member 62 (a place where the drive coil 80 is avoided in the movable body 5). Prevent further movement of Thus, in this embodiment, the movable body 5 is provided by the stopper portions 222b and 232b provided on the positioning protrusions 222 and 232 among the plurality of positioning protrusions 221, 222, 231, and 232 provided on the base 20. The range of movement is defined.

(Structure of spring member)
FIGS. 7A and 7B are explanatory views showing a contact state between the guide shaft and the inner wall of the penetrating portion in the optical element driving device to which the present invention is applied. FIGS. 7A and 7B show a lateral pressure applied to the movable body 5. It is explanatory drawing of the state which does not carry out, and explanatory drawing of the state which applied the side pressure to the movable body.

  As shown in FIGS. 1 and 2, in the optical element driving device 200 and the linear driving device 100 of the present embodiment, the magnetic drive mechanism 7 is used to drive the movable body 5 in the X-axis direction (optical axis direction), and the movable body 5 is movable. In order to hold the body 5 at a predetermined position, the thrust force generated by the magnetic drive mechanism 7 and the biasing force of the spring member are used. In addition, a spring member is used to prevent the movable body 5 from being greatly displaced when an external force such as vibration or external impact is applied. Specifically, a spring member described below is disposed between the fixed body 2 and the movable body 5.

  More specifically, in this embodiment, a first spring member 91 (spring member) made of a coil spring is provided around a portion of the first guide shaft 41 located between the side plate portion 22 and the first bearing portion 512 of the movable body 5. ) Is arranged in a compressed state. In this state, both end portions of the first spring member 91 are in contact with the side plate portion 22 and the first bearing portion 512, and the first bearing portion 512 and the side plate portion 22 are springs that receive both ends of the first spring member 91. It is used as a receiving part.

  Further, a second spring member 92 (spring member) made of a coil spring is compressed around a portion of the second guide shaft 42 located between the side plate portion 23 and the second bearing portion 523 of the movable body 5. Has been placed. In this state, both end portions of the second spring member 92 are in contact with the side plate portion 23 and the first bearing portion 512, and the third bearing portion 523 and the side plate portion 23 are springs that receive both ends of the second spring member 92. It is used as a receiving part.

  Here, the 1st spring member 91 and the 2nd spring member 92 are arrange | positioned in the position which pinches | interposes the movable body 5 on both sides of a Z-axis direction. The first spring member 91 and the second spring member 92 are disposed on the opposite side (one side and the other side) of the moving direction L with respect to the movable body 5, and the movable body 5 is opposite to the moving direction. It is energizing towards. For this reason, as shown in FIG. 6A, the rotational force in the clockwise direction indicated by the arrows R1 and R2 is applied to the movable body 5, and as a result, the first guide shaft 41 and the inner wall of the groove-like portion 512a. And the second guide shaft 42 and the inner wall of the through hole 523a are in contact with each other. Further, the second guide shaft 42 and the inner wall of the through hole 522a are in contact with each other. That is, as shown in FIG. 7A, between the first guide shaft 41 and the inner wall of the groove-like portion 512a, between the second guide shaft 42 and the inner wall of the through hole 523a, and between the second guide shaft 42 and Even when there are gaps G1, G2, and G3 due to clearance and the like between the inner wall of the through hole 522a, as shown in FIG. 7B, the movable body 5 has a clockwise direction indicated by arrows R1 and R2. When a rotational force is applied, the movable body 5 is subjected to a lateral pressure that causes the first guide shaft 41 and the corner portion 512e of the inner wall of the groove-shaped portion 512a to contact each other, and the second guide shaft 42 and the inner wall of the through hole 523a. The side pressure that makes contact with the corner portion 523e and the side pressure that makes the second guide shaft 42 and the corner portion 522e of the inner wall of the through hole 522a contact each other acts. Accordingly, the first guide shaft 41 and the inner wall of the groove-like portion 512a are in contact with each other, and the second guide shaft 42 and the inner walls of the through holes 522a and 523a are in contact with each other. For this reason, since the posture of the movable body 5 is fixed, the movable body 5 is driven in the X-axis direction while maintaining a stable posture.

  From the viewpoint of fixing the posture of the movable body 5, the first guide shaft 41 and the corner portion 512e of the inner wall of the groove-shaped portion 512a are in contact with each other, and the second guide shaft 42 and the corner of the inner wall of the through hole 523a are contacted. It is only necessary that one of the portion 523e and the corner portion 522e of the inner wall of the through hole 522a is in contact, and a configuration in which the two portions are in contact may be adopted.

  In the optical element driving device 200 and the linear driving device 100 of the present embodiment, when power is supplied to the drive coil 80, the first spring member 91 and the second spring member 92 made of a metal coil spring can be used as the power supply members. More specifically, the winding start end of the drive coil 80 is electrically connected to the first spring member 91, and the winding end end of the drive coil 80 is electrically connected to the second spring member 92. In performing this electrical connection, in the present embodiment, for example, the end of the winding start of the drive coil 80 is electrically connected to the end located on the first bearing portion 512 side of both ends of the first spring member 91. Connect the wiring from the outside to the end located on the side plate 22 side. Further, of the two ends of the second spring member 92, the end of the winding end of the drive coil 80 is electrically connected to the end located on the third bearing portion 513 side, and the end located on the side plate portion 23 side is connected. Connect external wiring electrically.

  According to this configuration, when the movable body 5 is displaced in the X-axis direction, the winding start end and the winding end end of the drive coil 80 are displaced together with the movable body 5 in the X-axis direction. Unnecessary force is not applied to the end of winding and the end of winding. Even when the movable body 5 is displaced in the X-axis direction, the external wiring is not displaced, so that unnecessary force is not applied to the wiring.

  When electrically connecting the drive coil 80 to the first spring member 91 and the second spring member 92, the winding start end of the drive coil 80 is directly soldered to the first spring member 91, and the drive coil A configuration in which the end of the winding end of 80 is soldered directly to the second spring member 92 can be employed. Alternatively, lands may be provided in the first bearing portion 512 and the third bearing portion 523, and the winding start end and winding end of the drive coil 80 may be soldered to the lands. When the first spring member 91 and the second spring member 92 are used as power supply members, the first spring member 91 and the second spring member 92 are connected via the first guide shaft 41, the second guide shaft 42, and the base 20. It is necessary to prevent short circuit. In preventing such a short circuit, the first spring member 91 and the second spring member 92 are made of a resin material, the first spring member 91 and the side plate portion 22, and the second spring member 92 and the side plate portion. It is sufficient to adopt a configuration in which an insulating material is interposed between the first and second members.

(Operation)
In the optical element driving device 200 and the linear driving device 100 of the present embodiment, the movable body 5 and the optical element 1 have the spring force of the first spring member 91 and the second spring member in a state where the drive coil 80 is not energized. It is held at a position where the spring force of 92 is balanced, that is, at the origin position. In the present embodiment, the origin position is a position where the center position of the drive coil 80 in the X-axis direction and the center position of the permanent magnet body 70 in the X-axis direction overlap in the Z-axis direction.

  From this state, when the drive coil 80 is energized and the movable body 5 is displaced by the magnetic drive mechanism 7 in one side in the X-axis direction (movement direction L) (the direction in which the first spring member 91 is compressed), the first spring member 91 generates drag. At that time, the second spring member 92 urges the movable body 5 to one side in the X-axis direction (movement direction L). As a result, the movable body 5 and the optical element 1 stop at a position where the thrust by the magnetic drive mechanism 7, the drag of the first spring member 91, and the biasing force of the second spring member 92 are balanced. When the drive coil 80 is energized in the reverse direction, the movable body 5 is displaced by the magnetic drive mechanism 7 to the other side in the X-axis direction (movement direction L) (the direction in which the second spring member 92 is compressed). As a result, the second spring member 92 generates a drag, and the first spring member 91 biases the movable body 5 to the other side in the X-axis direction (movement direction L). Therefore, the movable body 5 and the optical element 1 stop at a position where the thrust by the magnetic drive mechanism 7, the drag of the first spring member 91, and the biasing force of the second spring member 92 are balanced. When the energization of the drive coil 80 is stopped, the movable body 5 and the optical element 1 return to the position where the spring force of the first spring member 91 and the spring force of the second spring member 92 are balanced, that is, the origin position. , Hold there.

  Here, when the magnetic drive mechanism 7 is employed for driving the movable body 5, when an external force such as vibration or impact is applied to the movable body 5, the movable body 7 tends to be greatly displaced in the X-axis direction. In this embodiment, a first spring member 91 and a second spring member 92 that generate a drag force when the movable body 5 is displaced in the X-axis direction are provided between the fixed body 2 and the movable body 5. For this reason, the displacement in the X-axis direction of the movable body 7 due to external forces such as vibration and external impact is suppressed by the spring force of the first spring member 91 and the spring force of the second spring member 92.

  Further, when the movable body 5 is driven in the X-axis direction by the magnetic drive mechanism 7, a current that generates a thrust that overcomes the drag of the first spring member 91 and the second spring member 92 is supplied to the drive coil 80. At that time, when an external force such as vibration or external impact is applied to the movable body 7, the movable body 5 may come into contact with the side plate portions 22 and 23 of the base 20. Even in such a case, in this embodiment, the stopper portions 222b and 232b described with reference to FIGS. 5 and 6 are provided at the end portions 621 and 622 of the second reinforcing member 62 (locations where the drive coil 80 is avoided in the movable body 5). Abut. Therefore, since the drive coil 80 does not contact the side plate portions 22 and 23 of the base 20, disconnection of the drive coil 80 can be prevented. Further, since the drive coil 80 is wound around a portion sandwiched between the end portions 611 and 612 of the first reinforcement member 61 and a portion sandwiched between the end portions 621 and 622 of the second reinforcement member 62, the drive coil 80 is driven. Even if a slight impact is applied to the coil 80, the winding does not shift.

(Main effects of this form)
As described above, in the optical element driving device 200 and the linear driving device 100 of this embodiment, the permanent magnet body held on the fixed body 2 side when the movable body 5 is linearly reciprocated with respect to the fixed body 2. 70 and a drive coil 80 held on the movable body 5 side, and the permanent magnet body 70 is magnetized in multiple poles along the moving direction L of the movable body 5. As the drive coil 80, a voice coil that surrounds the entire circumference of the permanent magnet body 70 toward the opening in the X-axis direction (movement direction L) is used. According to this configuration, since the drive coil 80 is wound around the permanent magnet body 70, the magnetic field formed by the permanent magnet body 70 can be used effectively and maximally. Therefore, according to this embodiment, the size of the optical element driving device 200 and the linear driving device 100 is smaller than that of a stepping motor or a magnetic driving mechanism in which one side of the driving coil 80 faces the permanent magnet body 70. However, a large thrust can be generated.

  The permanent magnet body 70 includes a plurality of magnet pieces (a first magnet piece 71 and a second magnet piece 72) arranged along the X-axis direction (movement direction L), and the plurality of magnet pieces are adjacent to each other. The magnet pieces are arranged with the same pole facing the counterpart magnet piece, and a magnetic plate 75 is arranged between the magnet pieces. For this reason, the magnetic lines of force are concentrated from the first magnet piece 71 and the second magnet piece 72 on the side where the magnetic plate 75 is located, and the efficiency is increased from the magnetic plate 75 toward the periphery (Y-axis direction and Z-axis direction). Magnetic field lines are often generated. Therefore, since the magnetic flux density linked to the drive coil 80 can be increased as much as the leakage magnetic flux can be reduced, a large thrust can be generated even if the size of the optical element driving device 200 and the linear driving device 100 is small. .

  Further, since the magnetic plate 75 on which the magnetic lines of force are concentrated is always located within the movable range of the drive coil 80, the magnetic field formed by the permanent magnet body 70 is effectively and maximized regardless of the position of the movable body 5. Can be used. In addition, since the lines of magnetic force are concentrated on the magnetic plate 75, it is easy to configure the part where the lines of magnetic force are always located within the movable range of the drive coil 80. Therefore, according to this embodiment, a large thrust can be stably obtained regardless of the position of the movable body 5.

  The permanent magnet body 70 has a thin rectangular parallelepiped shape whose thickness direction is oriented in the Y-axis direction orthogonal to the X-axis direction, and the drive coil 80 is an angle that surrounds the periphery of the permanent magnet body 70 on the entire circumference. Since it has a cylindrical shape, the optical element driving device 200 and the linear driving device 100 can be thinned.

  In addition, spring members (first spring member 91 and second spring member 92) that generate a drag force when the movable body 5 is displaced by the magnetic drive mechanism 7 are provided between the fixed body 2 and the movable body 5. Therefore, the movable body 5 can be stopped at a predetermined position by controlling the current value energized to the drive coil 80 and the spring constant of the spring member. Moreover, in this embodiment, as the spring member, the first spring member 91 that generates a drag when the movable body 5 is displaced to one side in the moving direction L by the magnetic drive mechanism 7 and the movable body 5 by the magnetic drive mechanism 7. A second spring member 92 is provided that generates a drag when displaced to the other side in the movement direction L. For this reason, the movable body 5 is held at the origin position by the urging force of the first spring member 91 and the urging force of the second spring member 92 during the period when the power supply to the drive coil 80 is stopped. Therefore, the movable body 5 can be held at a predetermined position (origin position / center position of the permanent magnet body 70 in the X-axis direction) even when power supply to the drive coil 80 is stopped. Further, when energization of the drive coil 80 is stopped in a state where the drive coil 80 is energized and the movable body 5 is held at a predetermined position, the urging force of the first spring member 91 and the urging force of the second spring member 92 are The movable body 5 can be reliably returned to the origin position.

  In this embodiment, when the movable body 5 is linearly reciprocated with respect to the fixed body 2, the permanent magnet body 70 held on the fixed body 2 side and the drive coil 80 held on the movable body 5 side are provided. Since the magnetic drive mechanism 7 provided is used, the movable body 5 tends to be greatly displaced in the X-axis direction (drive direction by the magnetic drive mechanism 7) when an external force such as vibration or impact is applied from the outside. In this embodiment, since the spring member (the first spring member 91 and the second spring member 92) is provided between the fixed body 2 and the movable body 5, the movable member is caused by an external force such as vibration or impact from the outside. The displacement of the body 5 is suppressed. Therefore, it is possible to avoid a situation in which the movable body 5 is largely displaced by an external force such as vibration or an external impact.

  In this embodiment, since the movable body 5 is supported by the first guide shaft 41 and the second guide shaft 42, the movable body 5 can be supported in a stable posture. Further, the first spring member 91 and the second spring member 92 urge the movable body 5 toward the opposite side in the moving direction at a position sandwiching the movable body 5 on both sides in the Z-axis direction. As shown in FIG. 7, the rotational force in the clockwise direction indicated by arrows R1 and R2 is applied to the first guide shaft 41 and the inner wall of the groove-like portion 512a. 42 and the inner walls of the through holes 522a and 523a are in contact with each other. For this reason, the movable body 5 is driven in the X-axis direction while maintaining a stable posture. Therefore, it is possible to prevent the movable body 5 and the optical element 1 from blurring.

  Further, a lateral pressure is applied to the movable body 5 by using the first spring member 91 and the second spring member 92 for stopping the movable body 5 at the origin position or the like. Further, the first spring member 91 and the second spring member 92 are used as power feeding members to the drive coil 80. For this reason, it is not necessary to separately provide a spring member or a power feeding member for generating a side pressure. Therefore, the optical element driving device 200 and the linear driving device 100 can be reduced in size and thickness.

  In addition, the first spring member 91 and the second spring member 92 include a first bearing portion 512 and a second bearing portion 523 that protrude in the direction orthogonal to the moving direction L in the movable body 5, and the first in the fixed body 2. A coil spring disposed between the side plate portions 22 and 23 (fixed body side spring receiving portions) facing the bearing portion 512 in the moving direction L. For this reason, since it is not necessary to arrange | position a spring member in the side located in the moving direction L with respect to the movable body 5, a long coil spring can be used as a spring member. Therefore, it is easy to adjust the urging force of the first spring member 91 and the second spring member 92. Further, since the first spring member 91 and the second spring member 92 are provided around the first guide shaft 41 and the second guide shaft 42, a place where the first spring member 91 and the second spring member 92 are provided is provided. There is no need to secure it separately. Therefore, the optical element driving device 200 and the linear driving device 100 can be reduced in size and thickness.

  Further, of the first guide shaft 41 and the second guide shaft 42, the second guide shaft 42 closer to the element holding portion 524 is a main shaft that passes through the through holes 522a and 523a of the movable body 5, and the element holding portion. The first guide shaft 41 on the side closer to 524 is a secondary shaft that penetrates the groove-shaped portion 512 a of the movable body 5. For this reason, since the main shaft with less blur is located near the element holding portion 524, the blur of the element holding portion 524 and the blur of the optical element 1 can be suppressed.

  In addition, the side plate portions 22 and 23 of the base 20 support both shaft end portions of the first guide shaft 41 and the second guide shaft 42 by using portions protruding from both sides in the Z-axis direction from the permanent magnet body 70. Therefore, there is an advantage that it is not necessary to separately add a member for supporting the first guide shaft 41 and the second guide shaft 42.

  Furthermore, on the one side in the Z-axis direction of the movable body 5, one first bearing portion 512 that receives the first guide shaft 41 is provided, and on the movable body 5, the side on which the first bearing portion 512 is located. On the opposite side, two bearing portions (a first bearing portion 522 and a third bearing portion 523) that protrude in a direction orthogonal to the moving direction L are provided at positions separated in the moving direction L. Therefore, the movable body 5 is supported at one point on the first guide shaft 41 with respect to the fixed body 2 on the side where the first spring member 91 and the second spring member 92 are disposed, On the side opposite to the side where the two spring members 92 are disposed, the second guide shaft 42 is supported at two points. Therefore, since the movable body 5 is supported at three points, it moves in a stable posture. In particular, since the side of the movable body 5 on which the optical element 1 is held is two-point support, the posture of the optical element 1 can be suitably held.

  The fixed body 2 includes a yoke (base 20 and cover 30) that covers the permanent magnet body 70 and the drive coil 80 on both sides in the thickness direction of the permanent magnet body 70. The yoke, the permanent magnet body 70, and the drive are provided. When the coil 80 is viewed in plan, the size of the yoke is larger than the size of the permanent magnet body 70 and the size of the drive coil 80. For this reason, since the function as a yoke is high, for example, a magnetic path can be appropriately configured around the permanent magnet body 70 and the drive coil 80, the thickness of the base 20 and the cover 30 can be reduced. Therefore, the thickness dimension (dimension in the Y-axis direction) of the optical element driving device 200 and the linear driving device 100 can be reduced, and the thickness can be reduced. In addition, the permanent magnet body 70 and the drive coil 80 have a rectangular parallelepiped outer shape, and the portion where the cover 30 and the base 20 function as a yoke also has a rectangular parallelepiped outer shape. For this reason, since there is no unnecessarily large space between the permanent magnet body 70 and the drive coil 80 and the yoke, the function as a yoke is excellent. That is, if the drive coil 80 is cylindrical even though the yoke has a rectangular parallelepiped outer shape, a large dead space is wasted in the corner portion of the yoke. Such wasted space is omitted. For this reason, the optical element driving device 200 and the linear driving device 100 of this embodiment can generate a large thrust even if the size is small.

  Further, in this embodiment, the positioning protrusions 221, 222, 231, 232 are formed using the side plate portions 22, 23 of the base 20, and the permanent magnet body 70 is formed by the positioning protrusions 221, 222, 231, 232. Positioning. For this reason, the permanent magnet body 70 can be fixed on the fixed body 2 with high positional accuracy. Further, the positioning protrusions 221, 222, 231, 232 are formed on the large base 20 that functions as a yoke. Since the base 20 (yoke) is disposed in the vicinity of the permanent magnet body 70, the positioning protrusions 221, 222, 231, and 232 can be formed at appropriate locations. For this reason, the permanent magnet body 70 can be positioned by the relatively small positioning protrusions 221, 222, 231, and 232. Moreover, since the positioning protrusions 221, 222, 231, 232 are formed by bending a part of the base 20 functioning as a yoke, positioning for positioning the permanent magnet body 70 without adding a new member. Projecting portions 221, 222, 231, 232 can be provided.

  Of the plurality of positioning protrusions 221, 222, 231, 232, the positioning protrusions 222, 232 abut on the movable body 5 where the drive coil 80 is avoided, thereby providing a movable range of the movable body 5. Since the defining stopper portions 222b and 232b are provided, the movable range of the movable body 5 can be defined using the positioning protrusions 222 and 232. Moreover, since the stopper portions 222b and 232b abut on the movable body 5 where the drive coil 80 is avoided, the coil wire coating is peeled off due to the contact between the drive coil 80 and the stopper portions 222b and 232b, and the short circuit occurs. It is possible to prevent the drive coil 80 from being damaged. That is, the portion of the movable body 5 where the stopper portions 222b and 232b abut is extended in the moving direction L along the inner wall corresponding to the short side 80b of the inner peripheral surface of the drive coil 80, and is the end of the drive coil 80. These are end portions 621 and 622 of the second reinforcing member 62 protruding from the portion. The end portions 621 and 622 are bonded to both ends of the second holder member 52 extending in the movement direction L along the outer wall corresponding to the short side 80b in the outer peripheral surface of the drive coil 80. . For this reason, when the stopper portions 222 b and 232 b are in contact with the end portions 621 and 622 of the second reinforcing member 62, an external force such as vibration or a large impact is not applied to the drive coil 80. Therefore, it is possible to reliably prevent the drive coil 80 from being damaged.

  Further, when adopting a structure in which the first holder member 51 and the second holder member 52 are separately attached to the side surface of the drive coil 80, the Z axis of the drive coil 80 is interposed via the first reinforcement member 61 and the second reinforcement member 62. The first holder member 51 is attached to one side surface in the direction, and the second holder member 52 is attached to the other side surface in the Z-axis direction of the drive coil 80 via the first reinforcing member 61 and the second reinforcing member 62. The structure is adopted. For this reason, it is not necessary to fix the first holder member 51 and the second holder member 52 directly to the outer surface of the drive coil 80 with an adhesive or the like. Further, the first holder member 51 and the second holder member 52 can be separated from the drive coil 80. Even when the first holder member 51 and the second holder member 52 are in contact with the drive coil 80, the first holder member 51 and the second holder member 52 can be in a state of being loosely in contact with the drive coil 80. . Therefore, since a large load is not applied to the drive coil 80, the drive coil 80 is not damaged. Even when the outer surface of the drive coil 80 has irregularities due to the coil wire, the first holder member 51, the second holder member 52, and the drive coil 80 can be reliably integrated. In particular, in the present embodiment, by adopting such a configuration, it is possible to prevent the second holder member 52 that holds the optical element 1 such as a lens from being tilted, and thus it is possible to prevent the optical axis from being shifted.

  In addition, when the first reinforcing member 61 and the second reinforcing member 62 are provided inside the driving coil 80, the driving coil 80 and the permanent magnet body 70 are disposed at the place where the first reinforcing member 61 and the second reinforcing member 62 are provided. The first reinforcing member 61 and the second reinforcing member 62 are provided along inner walls corresponding to the short sides 80a and 80b in the inner peripheral surface of the drive coil 80, although the gap is widened. For this reason, unlike the case where the first reinforcing member 61 and the second reinforcing member 62 are provided along the inner walls corresponding to the long sides 80c and 80d of the drive coil 80, the reduction in thrust can be minimized. That is, between the drive coil 80 and the permanent magnet body 70, the first reinforcing member 61 and the second reinforcing member are provided in portions corresponding to the long sides 80c and 80d of the drive coil 80 (portions located in the Y-axis direction). 62 is not present, and only a narrow gap exists. For this reason, the drive coil 80 and the permanent magnet body 70 can be brought close to each other in the Y-axis direction. Therefore, since the magnetic flux density interlinking the drive coil 80 can be increased, a large thrust can be applied to the movable body 5.

  Further, in this embodiment, since two plate members (the first reinforcing member 61 and the second reinforcing member 62) that face each other in the Z-axis direction are used as bobbins, the configuration is compared with a configuration in which the drive coil 80 is wound around a cylindrical bobbin. Thus, the weight of the movable body 5 can be reduced.

[Other embodiments]
In the above embodiment, the first spring member 91 is disposed between the side plate portion 22 and the first bearing portion 512 of the movable body 5, and the first spring member 91 is disposed between the side plate portion 23 and the second bearing portion 523 of the movable body 5. Although the two spring members 92 are disposed, the first spring member 91 and the second spring member 92 may be disposed at the following positions.

  For example, when the first spring member 91 is disposed between the side plate portion 22 and the first bearing portion 512 of the movable body 5, the third guide shaft 43 is regarded as a “second guide shaft” and the side plate portion 25. And the second spring member 92 may be disposed between the element holding portion 524 of the movable body 5.

  Further, a first spring member 91 is disposed between the side plate portion 23 and the first bearing portion 512 of the movable body 5, and between the side plate portion 22 and the first bearing portion 522 of the movable body 5, or with the side plate portion 22. A second spring member 92 may be disposed between the element holding portion 524 of the movable body 5.

  In the above-described embodiment, two magnet pieces are used for the permanent magnet body 70, but the present invention may be applied when three or more magnet pieces are used. In the above embodiment, a cylindrical coil is used as the drive coil 80. However, a flat coil or the like having an opening portion facing the permanent magnet body 70 may be used.

  In the above embodiment, the first spring member 91 and the second spring member 92 are used as compression springs. However, the first spring member 91 and the second spring member 92 may be used as tension springs. Moreover, you may employ | adopt the structure that the 1st spring member 91 and the 2nd spring member 92 function as a compression spring and a tension spring, respectively according to the position in the movable body 5. FIG.

  In the above embodiment, the spring members (the first spring member 91 and the second spring member 92) are used as power supply members. However, the end of the coil is soldered to a flexible wiring member such as a flexible wiring board. Power supply to the drive coil 80 may be performed. In this case, if the slack portion of the flexible wiring member is directed in the X-axis direction, an extra load can be suppressed from being applied to the movable body 5. The configuration in which a flexible wiring member such as a flexible wiring board is used as a power feeding member to the drive coil 80 is provided when a spring member (the first spring member 91 and the second spring member 92) is provided or the spring member is used. It can be employed in any case where it is not provided.

  In the above embodiment, the two spring members including the first spring member 91 and the second spring member 92 are used as the spring members. However, one spring member may be used. Also in this case, if the drag generated by the spring member when the movable body 5 is displaced by the magnetic drive mechanism 7 is used, the current value energized to the drive coil 80 and the spring constant of the spring member are controlled, The movable body 5 can be stopped at a predetermined position. In the above embodiment, the coil spring is used as the spring member. However, a U-shaped or V-shaped leaf spring may be used in addition to the coil spring.

  In the above embodiment, the first spring member 91 and the second spring member 92 are used to stop the movable body 5 at the origin position or the like, but a configuration in which the first spring member 91 and the second spring member 92 are not used is adopted. May be. In this case, a spring member that applies a lateral pressure to the movable body 5 may be provided separately. Further, a position detection system using a Hall element, a magnetic sensor, or the like may be disposed between the movable body 5 and the fixed body 2 to control the position of the movable body 5 in a closed loop.

  In the above embodiment, the two guide shafts of the first guide shaft 41 and the second guide shaft 42 are used. However, the present invention may be applied to the case where there is one guide shaft.

  In the above embodiment, the first reinforcing member 61 and the second reinforcing member 62 are used as stoppers, and the drive coil 80, the first holder member 51, and the second holder member 52 are integrated. A configuration in which the first reinforcing member 61 and the second reinforcing member 62 are not used may be employed. In this case, the shape of the first holder member 51 and the second holder member 52 may be changed to adopt a structure in which the stopper portions 222b and 232b are in contact with the first holder member 51 and the second holder member 52. Further, a configuration in which the first holder member 51 and the second holder member 52 are surface-bonded to the drive coil 80, and a configuration in which the first holder member 51 and the second holder member 52 are three-dimensionally bonded to the drive coil 80. It may be adopted.

1 Optical element (driven member)
2 fixed body 5 movable body 7 magnetic drive mechanism 20 base (yoke)
22 and 23 Base side plate 30 Cover (yoke)
41 First guide shaft 42 Second guide shaft 43 Third guide shaft 51 First holder member 52 Second holder member 70 Permanent magnet body 71 First magnet piece 72 Second magnet piece 75 Magnetic plate 80 Drive coil 91 First spring member 92 Second spring member 100 Linear drive device 200 Optical element drive device 512 First bearing portion 512a Groove-shaped portion (penetrating portion)
522 Second bearing portion 522a, 523a Through hole (through portion)
523 Third bearing portion 524 Element holding portion (member holding portion)

Claims (7)

A linear drive device that linearly moves the movable body relative to the fixed body,
The fixed body includes a permanent magnet body magnetized in multiple poles along the moving direction of the movable body, and a guide shaft extending along the moving direction of the movable body,
The movable body includes a drive coil that constitutes a magnetic drive mechanism that faces the permanent magnet body with a gap therebetween, and a penetrating portion that engages with the guide shaft,
A linear drive device characterized in that a spring member is provided between the fixed body and the movable body to apply a lateral pressure in a direction intersecting the axial direction of the guide shaft to the movable body.   The linear drive device according to claim 1, wherein the fixed body includes a first guide shaft and a second guide shaft provided on both sides of the movable body as the guide shaft. Between the fixed body and the movable body, as the spring member, a first spring member that urges the movable body in the moving direction, and the first spring member with respect to the moving direction. A second spring member that urges the movable body in a direction opposite to the first spring member at a position shifted in a direction intersecting with the first spring member,
The movable body is held at an origin position by a biasing force of the first spring member and a biasing force of the second spring member during a period when power supply to the drive coil is stopped. The linear drive device according to 2. The first spring member is a first coil spring;
The linear drive device according to claim 3, wherein the second spring member is a second coil spring. The first coil spring is provided on one side of the moving direction with respect to the movable body around the first guide shaft,
5. The linear drive device according to claim 4, wherein the second coil spring is provided on the other side of the moving direction with respect to the movable body around the second guide shaft. 6.   6. The linear drive according to claim 1, wherein the spring member is electrically connected to a winding of the drive coil and is used as a power supply member for the drive coil. 7. apparatus. An optical element driving device comprising the linear driving device according to any one of claims 1 to 6,
An optical element driving apparatus, wherein an optical element is held on the movable body.

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