JP2011078151A - Linear drive device and optical element drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear drive device and an optical element drive device, capable of stably obtaining a large thrust force irrespective of the position of a movable member. <P>SOLUTION: In a magnetic drive mechanism 7 of the optical element drive device 200 and the linear drive device 100, a permanent magnetic material 70 provided on a stator 2 side includes a plurality of magnetic pieces (a first magnetic piece 71 and a second magnetic piece 72) disposed along a moving direction L, and a magnetic plate 75 provided between the adjacent magnetic pieces. The first magnet piece 71 and the second magnet piece 72 are disposed with the same pole directed to the opposite magnet piece. The movable member 5 includes a drive coil 80 (cylindrical coil) having an opening directed to the moving direction L, and the magnetic plate 75 is positioned in a movable range of the drive coil 80. <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 for an optical element drive device that linearly reciprocates a movable body holding optical elements such as a zoom lens and a collimator lens, a device using a voice coil motor or a stepping motor is used. (See Patent Documents 1 and 2).

JP-A-4-360798 JP-A-6-281852

  However, the linear drive device (optical element drive device) using the voice coil motor and the stepping motor described in Patent Documents 1 and 2 has a problem that it is difficult to reduce the size.

  Here, the inventor proposes a method of driving the movable body by a magnetic drive mechanism in which a magnet provided on one of the movable body and the fixed body and a coil provided on the other face each other. However, in this method, there is a problem that the thrust is small and the magnetic flux density linked to the coil is lowered as the movable body is moved to reduce the thrust, so that stable driving cannot be performed.

  In view of the above problems, an object of the present invention is to provide a linear drive device that can stably obtain a large thrust regardless of the position of the movable body, and an optical element drive device including the linear drive device. There is to do.

  In order to solve the above problems, the present invention is a linear drive device that linearly moves a movable body relative to a fixed body, and is held on the fixed body side between the fixed body and the movable body. And a drive coil held on the movable body side so as to have a gap between the permanent magnet body, and the permanent magnet body has the moving direction. And a magnetic plate provided between the adjacent magnet pieces, and the adjacent magnet pieces in the plurality of magnet pieces have the same pole as the opposite magnet pieces. The driving coil is a cylindrical coil wound around the permanent magnet body with a gap between the permanent magnet body and the opening in the moving direction. The magnetic plate is located within the movable range of the drive coil. To.

  In the present invention, when the movable body is linearly reciprocated with respect to the fixed body, a magnetic drive mechanism including a permanent magnet body held on the fixed body side and a drive coil held on the movable body side is used. The permanent magnet body includes a plurality of magnet pieces arranged in the moving direction, and a voice coil that surrounds the entire periphery of the permanent magnet body in the moving direction toward the opening in the moving direction is used. In such a configuration, since the drive coil is wound around the permanent magnet body, the magnetic field formed by the permanent magnet body can be used effectively and maximally. Moreover, in a permanent magnet body, adjacent magnet pieces are arrange | positioned toward the adjacent magnet piece, and the magnetic board is arrange | positioned between adjacent magnet pieces. For this reason, since magnetic lines of force concentrate on the magnetic plate, the magnetic field formed by the permanent magnet body can be used effectively and maximally. Furthermore, since the magnetic plate where the magnetic field lines are concentrated is always located within the movable range of the drive coil, the magnetic field formed by the permanent magnet body can be used effectively and maximally regardless of the position of the movable body. Can do. Moreover, since the lines of magnetic force are concentrated on the magnetic plate, it is easy to configure so that the portion where the lines of magnetic force are concentrated is always located within the movable range of the drive coil.

  In the present invention, it is preferable that a region adjacent to the magnetic plate on both sides in the moving direction in the magnet piece and a thrust generation region made of the magnetic plate are located within a movable range of the drive coil. In the magnet piece, the magnetic field lines are also concentrated in the area adjacent to the magnetic plate on both sides, so the drive coil is movable in the magnet piece in the area adjacent to the magnetic plate on both sides and the thrust generation area including the magnetic plate. When configured so as to be located within the range, the region where the magnetic lines of force are concentrated is always located within the movable range of the drive coil. For this reason, even when the movable body moves to any position, the magnetic field formed by the permanent magnet body can be used effectively and maximally, so that a large thrust can be stably obtained regardless of the position of the movable body. be able to.

  In this invention, it is preferable that the dimension in the said moving direction of the said thrust generation | occurrence | production area | region exceeds 1 time and the 3 times or less of the dimension in the said moving direction of the said magnetic board. In other words, it is preferable that the magnetic plate is configured such that a region exceeding one time and three times or less of the dimension in the moving direction of the magnetic plate is a thrust generation region, and the thrust generation region is located within the movable range of the drive coil. . Even if the thrust generation area is set to an excessively long dimension, the effect of effectively using the magnetic field formed by the permanent magnet body is not improved, but the thrust generation area having a long dimension is positioned within the movable range of the drive coil. However, restrictions such as narrowing the moving range of the movable body occur. Therefore, it is preferable that the upper limit of the dimension in the moving direction of the thrust generation region is three times the dimension of the magnetic plate.

  In the present invention, it is preferable that the extreme end portions on both sides in the moving direction of the region where the magnet pieces are arranged in the permanent magnet body are located outside the movable range of the drive coil. If comprised in this way, the magnetic field which a permanent magnet body forms can be utilized still more effectively.

  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, since the drive coil provided on the movable body side is wound around the permanent magnet body provided on the fixed body side, the magnetic field formed by the permanent magnet body can be used effectively and maximally. Further, in the permanent magnet body, adjacent magnet pieces are arranged with the same pole facing the adjacent magnet pieces, and a magnetic plate is arranged between the adjacent magnet pieces. Therefore, the magnetic field formed by the permanent magnet body can be used effectively and maximally. Therefore, according to the present invention, a large thrust can be obtained. Furthermore, since the magnetic plate where the magnetic field lines are concentrated is always located within the movable range of the drive coil, the magnetic field formed by the permanent magnet body can be used effectively and maximally regardless of the position of the movable body. Can do. Moreover, since the lines of magnetic force are concentrated on the magnetic plate, it is easy to configure so that the portion where the lines of magnetic force are concentrated is always located within the movable range of the drive coil. Therefore, according to the present invention, compared to a stepping motor or a magnetic drive mechanism in which only a part of a drive coil faces a permanent magnet body, a large thrust can be generated even if the size is small, Regardless of the position of the movable body, a large thrust can be obtained stably.

It is explanatory drawing which shows the whole structure of the optical element drive device which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the state which isolate | separated the optical element drive device which concerns on Embodiment 1 of this invention 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 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the internal structure of the optical element drive device which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the structure for the electric power feeding to a drive coil in the optical element drive device which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the dimensional structure of the magnetic drive mechanism used for the optical element drive device and linear drive device which concern on Embodiment 1 of this invention. It is explanatory drawing of the magnetic drive mechanism used for the optical element drive device and linear drive device which concern on Embodiment 1 of this invention. It is explanatory drawing which shows the dimension structure of the magnetic drive mechanism used for the optical element drive device and linear drive device which concern on the modification of Embodiment 1 of this invention. It is explanatory drawing of the magnetic drive mechanism used for the optical element drive device and linear drive device which concern on Embodiment 2 of this invention. It is explanatory drawing which shows the dimensional structure of the magnetic drive mechanism used for the optical element drive device and linear drive device which concern on Embodiment 2 of this invention. It is explanatory drawing which shows the dimension structure of the magnetic drive mechanism used for the optical element drive device and linear drive device which concern on the modification of Embodiment 2 of this invention. It is explanatory drawing which shows the dimensional structure of the magnetic drive mechanism used for the optical element drive device and linear drive device which concern on the improvement example of Embodiment 1, 2 of this invention.

  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.

[Embodiment 1]
(Overall configuration of optical element driving device)
FIG. 1 is an explanatory diagram showing the overall configuration of an optical element driving apparatus according to Embodiment 1 of the present invention, and FIGS. 1 (a) and 1 (b) are optical elements according to Embodiment 1 of the present invention. FIG. 4 is a perspective view of the driving device and a perspective view of a state where a cover is removed from the optical element driving 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 the optical element 1. 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 obtained by bending a thin plate into a predetermined shape, a guide shaft that is held so as to extend in the X-axis direction with respect to the base 20, and a plate-like cover 30. I have. 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 in which the optical element driving apparatus according to Embodiment 1 of the present invention 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 according to Embodiment 1 of the present invention, and FIGS. 3 (a) and 3 (b) are respectively related to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view showing a state in which a drive coil is removed from a movable body in the optical element driving apparatus, and an exploded perspective view showing a state in which the movable body is further broken down.

  As shown in FIGS. 1, 2, and 3, the movable body 5 includes a first holder member 51 located on one side in the Z-axis direction and a first holder member 51 on the other side in the Z-axis direction. The second holder member 52 facing each other, the rectangular first plate 61 connecting the lower end of the first holder member 51 and the lower end of the second holder member 52, the upper end of the first holder member 51 and the second A rectangular second plate 62 that connects the upper end portion of the holder member 52 is provided, and has a substantially rectangular tube shape with an opening in the X-axis direction (movement direction L). Both the first plate 61 and the second plate 62 are non-magnetic thin plates. The first holder member 51 and the second holder member 52 are made of a nonmagnetic material such as resin.

  Here, the first plate 61 includes protrusions 611, 612, 613, and 614 protruding in the Z-axis direction at each of the four corner portions. In this embodiment, the protrusions 611 and 613 located on one side in the X-axis direction protrude from the side portion extending in the Z-axis direction at one end portion in the X-axis direction of the first plate 61 and the other in the X-axis direction. The protrusions 612 and 614 located on the side protrude from the side portion extending in the Z-axis direction at the other end portion in the X-axis direction of the first plate 61. Similarly to the first plate 61, the second plate 62 includes protrusions 621, 622, 623, and 624 that protrude in the Z-axis direction at each of the four corner portions. In this embodiment, the protrusions 621 and 623 located on one side in the X-axis direction protrude from the side portion extending in the Z-axis direction at one end portion in the X-axis direction of the second plate 62 and the other in the X-axis direction. The protrusions 622 and 624 located on the side protrude from the side portion extending in the Z-axis direction at the other end portion in the X-axis direction of the second plate 62.

  In this embodiment, the first holder 61 has the first holder 61 with respect to the protrusions 611 and 612 formed on one side in the Z-axis direction and the protrusions 621 and 622 formed on one side in the Z-axis direction on the second plate 62. The member 51 is fixed. Further, the second holder member 52 is formed with respect to the protrusions 613 and 614 formed on the other side in the Z-axis direction on the first plate 61 and the protrusions 623 and 624 formed on the other side in the Z-axis direction on the second plate 62. Is fixed.

  In the present embodiment, as described later, the side portions on both sides of the first plate 61 located in the X-axis direction and the side portions on both sides of the second plate 62 located in the X-axis direction have the movable body 5 in the X-axis direction. It is used as a stopper that comes into contact with the side plate portions 22 and 23 of the base 20 when moved to the position.

  Further, as will be described later, the first plate 61 and the second plate 62 are used as bobbins when the drive coil 80 is wound, and also function as reinforcing plates that reinforce 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. Here, the first bearing portion 512 is formed with a through portion (through hole) 512a penetrating in the X-axis direction and a slit portion extending from one side (outside) of the first bearing portion 512 in the Z-axis direction to the through portion 512a. It is formed in a U-shaped groove shape. The penetration portion 512a is a guide portion that guides the first guide shaft 41, and the first guide shaft 41 penetrates in the X-axis direction. In this embodiment, spring members (first spring member 91 and second spring member 92), which will be described later, are arranged on both sides in the X-axis direction of the first bearing portion 512, and the first bearing portion 512 is a spring. The movable body side spring receiving part which receives a member is comprised.

  The second holder member 52 includes a plate-like portion 521 extending in the X-axis direction, and one side in the Z-axis direction from the one-side end portion of the plate-like portion 521 in the X-axis direction (the inner / first holder member 51 is A second bearing portion 522 that protrudes toward the position) and one end in the Z-axis direction (inner side / first holder member 51) from the other end portion of the plate-like portion 521 that is separated from the second bearing portion 522 in the X-axis direction. A third bearing portion 523 that projects to the other side (outside) in the Z-axis direction from a substantially central position in the X-axis direction of the plate-shaped portion 521. Yes.

  The second bearing portion 522 and the third bearing portion 523 face each other in the X-axis direction with a predetermined distance therebetween. In addition, the second bearing portion 522 and the third bearing portion 523 are formed with through portions 522a and 523a formed of holes penetrating in the X axis direction at positions overlapping when viewed from the X axis direction, and the through portions 522a, The second guide shaft 42 passes through 523a.

  In the element holding portion 524, an element holding hole 525 penetrating in the X-axis direction is formed at a substantially central portion in the Z-axis direction, and the optical element 1 is held in the element holding hole 525. In addition, a penetrating part 524a including a hole penetrating in the X-axis direction is formed at the tip of the element holding part 524, and the third guide shaft 43 penetrates the penetrating part 524a.

(Configuration of magnetic drive mechanism)
FIG. 4 is a cross-sectional view showing the internal configuration of the optical element driving apparatus according to Embodiment 1 of the present invention, and FIGS. 4A and 4B respectively show the optical element according to Embodiment 1 of the present invention. It is sectional drawing when a drive device is cut | disconnected by the position shown by X1-X1 'of Fig.1 (a), and sectional drawing when cut | disconnected by 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. Further, between the fixed body 2 and the movable body 5, the permanent magnet body 70 held on the fixed body 2 side is held on the movable body 5 side with a gap between the permanent magnet body 70. The magnetic drive mechanism 7 including the drive coil 80 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 substantially 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 cylindrical voice coil facing the opening in the X-axis direction, and the permanent magnet body 70 is located inside the drive coil 80. Has been placed. 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 plate 61 and the second plate 62 in the movable body 5. In this embodiment, the drive coil 80 is wound around a portion sandwiched between the projection 611 and the projection 612 that are separated in the X-axis direction and a portion sandwiched between the projection 613 and the projection 614 in the first plate 61. . The drive coil 80 is wound around a portion sandwiched between the projection 621 and the projection 622 that are spaced apart in the X-axis direction and a portion sandwiched between the projection 623 and the projection 624 in the second plate 62.

  In this state, the first plate 61 and the second plate 62 are positioned inside the drive coil 80, and the winding portion of the drive coil 80 positioned in the Y-axis direction is reinforced by the first plate 61 and the second plate 62. It is in the state that was done.

  Here, the first plate 61 and the second plate 62 are two plate members facing each other in the Y-axis direction, and a gap exists between the first plate 61 and the second plate 62 and the permanent magnet body 70 in the Y-axis direction. Therefore, a gap is interposed between the drive coil 80 and the permanent magnet body 70 in the Y-axis direction, and the first plate 61 or the second plate 62 is interposed. On the other hand, only a narrow gap exists between the drive coil 80 and the permanent magnet body 70 in the Z-axis direction, and the first plate 61 and the second plate 62 are not interposed. For this reason, in the Z-axis direction, the magnetic flux density linking the drive coil 80 can be increased by the amount that the drive coil 80 and the permanent magnet body 70 can be brought closer to each other.

  In this embodiment, when the drive coil 80 is formed, the movable body 5 is used as a coil bobbin. That is, a portion of the first plate 61 sandwiched between the protrusion 611 and the protrusion 612 in a state where the first plate 61 and the second plate 62 are opposed to each other with a predetermined gap by the jig, the first plate 61, a portion sandwiched between the projection 613 and the projection 614, a portion sandwiched between the projection 623 and the projection 624 in the second plate 62, and a portion sandwiched between the projection 621 and the projection 622 in the second plate 62. A wire is wound to form the drive coil 80. At that time, as will be described later with reference to FIG. 5B, the coil wire is wound around the protrusion 621 of the second plate 62, and then the coil wire winding end is set to the second end. It can be tied to another protrusion 622 of the plate 62.

  Thereafter, the first holder member 51 is fixed to the protrusions 611 and 612 of the first plate 61 and the protrusions 621 and 622 of the second plate 62, and the protrusions 613 and 614 of the first plate 61 and the second plate 62 are fixed. If the second holder member 52 is fixed to the projections 623 and 624, the movable body 5 can be assembled.

  Thus, in this embodiment, when the first bearing portion 512 is provided on one side of the movable body 5 in the Z-axis direction, the protrusions 611 and 612 of the first plate 61 and the protrusions 621 and 622 of the second plate 62 are interposed. Thus, a structure in which the first holder member 51 is attached to one side surface of the drive coil 80 in the Z-axis direction is employed. In this embodiment, when the second 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 protrusions 613 and 614 of the first plate 61 and the protrusion 623 of the second plate 62 are provided. , 624, the second holder member 52 is attached to the other side surface of the drive coil 80 in the Z-axis direction.

(Structure of spring member)
In the optical element driving device 200 and the linear driving device 100 of this 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 held at a predetermined position. The thrust 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. ) In a compressed state, and around the portion of the first guide shaft 41 located between the side plate portion 23 and the first bearing portion 512 of the movable body 5, a second spring member 92 ( The spring member is placed in a compressed state. In this state, both end portions of the first spring member 91 abut on the side plate portion 22 and the first bearing portion 512, and both end portions of the second spring member 92 abut on the side plate portion 23 and the first bearing portion 512.

  According to such a configuration, in a state where the drive coil 80 is not energized, the movable body 5 and the optical element 1 are in positions where the spring force of the first spring member 91 and the spring force of the second spring member 92 are balanced, That is, it is held 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 this 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 drive coil 80 is wound inside the protrusions 611 to 614 and 621 to 624 of the first plate 61 and the second plate 62, and the X axis of the first plate 61 and the second plate 62. The end of the direction protrudes from the end of the drive coil 80. For this reason, it is the end portions of the first plate 61 and the second plate 62 in the X-axis direction that contact the side plate portions 22 and 23 of the base 20 in the movable body 5. 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. Moreover, since the drive coil 80 is wound inside the projections 611 to 614 and 621 to 624 of the first plate 61 and the second plate 62, there is an advantage that the winding is not shifted.

(Power supply to the drive coil 80)
FIG. 5 is an explanatory diagram showing a configuration for feeding power to the drive coil in the optical element driving apparatus according to Embodiment 1 of the present invention. FIGS. 5 (a), 5 (b), and 5 (c) FIG. 3 is an explanatory diagram showing a connection relationship between a drive coil and a spring member in the optical element driving apparatus according to Embodiment 1 of the present invention, an explanatory diagram showing a positional relationship between the drive coil, the spring member, the first holder member, and a plate; It is explanatory drawing at the time of forming a land in 1 holder member.

  In the optical element driving device 200 and the linear driving device 100 of this 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 are used as the power supply members.

  More specifically, as shown in FIGS. 5A and 5B, the winding start end 81 of the drive coil 80 is electrically connected to the first spring member 91, and the winding end of the drive coil 80 is The end 82 is electrically connected to the second spring member 92. In making this electrical connection, in the present embodiment, among the both ends of the first spring member 91, the end portion 81 at the start of winding of the drive coil 80 is electrically connected to the end portion located on the first bearing portion 512 side. Then, an external wiring 86 is electrically connected to the end located on the side plate portion 22 side. Similarly to the first spring member 91, the second spring member 92 also electrically connects the end 82 at the end of winding of the drive coil 80 to the end located on the first bearing portion 512 side of both ends. The external wiring 87 is electrically connected to the end located on the side plate portion 23 side. When winding the coil wire, as shown in FIG. 5 (b), the coil wire is wound after winding the end 81 of the coil wire around the protrusion 621 of the second plate 62, and then the coil wire is wound. The end 82 of the end of winding of the wire can be entangled with another protrusion 622 of the second plate 62.

  According to this configuration, when the movable body 5 is displaced in the X-axis direction, the winding start end 81 and the winding end end 82 of the drive coil 80 are displaced in the X-axis direction together with the movable body 5. Unnecessary force is not applied to the winding start end 81 and the winding end end 82 of the coil 80. Even when the movable body 5 is displaced in the X-axis direction, the wirings 86 and 87 from the outside are not displaced, so that unnecessary force is not applied to the wiring.

  Further, in electrically connecting the drive coil 80 to the first spring member 91 and the second spring member 92, the winding winding end portion 81 of the drive coil 80 is directly soldered to the first coil member, and the drive coil A configuration in which the end portion 82 at the end of winding 80 is directly soldered to the second coil member can be employed.

  In addition, as shown in FIG. 5C, lands 512c are provided on both surfaces of the first bearing portion 512 facing the X-axis direction in an electrically independent state, and the winding winding end of the drive coil 80 is provided. 81 and the end 82 at the end of winding may be soldered to the land 512c, and the end of the first spring member 91 and the end of the second spring member 92 may be soldered to the land 512c.

  When the first spring member 91 and the second spring member 92 are used as power supply members, it is necessary to prevent the first spring member 91 and the second spring member 92 from being short-circuited via the first guide shaft 41. . In order to prevent such a short circuit, the first guide shaft 41 may be formed of an insulating material or a structure in which an insulating layer is provided around the metal first guide shaft 41.

  Further, when the first spring member 91 and the second spring member 92 are used as power feeding members, it is necessary to prevent the first spring member 91 and the second spring member 92 from being short-circuited via the base 20. In order to prevent such a short circuit, although not shown, a configuration in which an insulating material is interposed between the first spring member 91 and the side plate portion 22 and between the second spring member 92 and the side plate portion 23 is employed. do it.

(Detailed configuration of magnetic drive mechanism 7)
FIG. 6 is an explanatory diagram showing a dimensional configuration of the magnetic drive mechanism 7 used in the optical element driving device 200 and the linear driving device 100 according to Embodiment 1 of the present invention, and FIG. FIGS. 6B and 6C are explanatory views of the mechanism 7, FIG. 6B and FIG. 6C are explanatory views of the permanent magnet body 70 and the drive coil, and FIGS. 6D to 6F are views of the permanent magnet body 70 provided on the fixed body 2 side. On the other hand, it is explanatory drawing which shows each dimension in the state which the drive coil 80 provided in the movable body 5 side moved relatively. FIG. 7 is an explanatory diagram of the magnetic driving mechanism 7 used in the optical element driving device 200 and the linear driving device 100 according to the first embodiment of the present invention, and FIGS. 7A to 7E are the movable body 5 side. FIG. 7 (f) is a simulation of the relationship between the position of the drive coil 80 and the thrust force F. FIG. 7 (f) is a diagram illustrating a state in which the drive coil 80 provided in FIG. FIG. 7G is a graph showing the relationship between the position of the drive coil 80 and the thrust F. FIG.

  As shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C, in the magnetic drive mechanism 7 used in the optical element driving device 200 and the linear driving device 100 of this embodiment, the permanent magnet body provided on the fixed body 2 side. 70 includes a plurality of magnet pieces (a first magnet piece 71 and a second magnet piece 72) arranged along the moving direction L, and a magnetic plate 75 provided between adjacent magnet pieces. Moreover, the 1st magnet piece 71 and the 2nd magnet piece 72 are arrange | positioned toward the magnet piece of the other party with the same pole. The movable body 5 includes a drive coil 80 (cylindrical coil) facing the opening in the movement direction L. As shown in FIGS. 6D, 6E, and 6F, the drive coil 80 is movable. It moves in the movement direction L as a part of the body 5. Here, FIG. 6D is an explanatory diagram of a state in which the drive coil 80 is in the middle of the movement direction L, and FIG. 6E is a diagram illustrating the drive coil 80 on the most side L2 side in the movement direction L. FIG. 6F is an explanatory diagram of a state in which the drive coil 80 has moved to the other side L1 in the movement direction L. FIG.

  When the operations shown in FIGS. 6D to 6F are performed, a magnetic force acting between the permanent magnet body 70 provided on the fixed body 2 side and the drive coil 80 provided on the movable body 55 side is generated. The thrust changes depending on the position of the drive coil 80 as shown in FIG. That is, the thrust F when the drive coil 80 moves to each position shown in FIGS. 7A to 7E is expressed as shown in FIG. Further, the relationship between the driving coil 80 movement amount x and the thrust F from the state where the center in the moving direction L of the permanent magnet body 70 (the center of the magnetic plate 75) and the center in the moving direction L of the driving coil 80 overlap each other is as follows. It is expressed as shown in FIG.

  As shown in FIGS. 7F and 7G, the center of the permanent magnet body 70 in the moving direction L (the center of the magnetic plate 75) and the center of the driving coil 80 in the moving direction L overlap (center). In a range where the amount of movement of the drive coil 80 from the position) is small, the thrust F shows a high level, but when the amount of movement of the drive coil 80 increases, the thrust F decreases. In particular, when the drive coil 80 and the magnetic plate 75 are displaced in the moving direction L, the thrust F is significantly reduced. Therefore, in this embodiment, the stroke S of the drive coil 80 is set in a region where the thrust F is high in FIG. 7F (range shown in FIGS. 7B to 7D).

  In order to realize such a configuration, in this embodiment, the stroke S and the like are set so that the magnetic plate 75 is positioned within the movable range of the drive coil 80 as described below with reference to FIG. That is, even if the drive coil 80 moves from one side L2 in the movement direction L to the other side L1, the stroke S and the like are configured so that the magnetic plate 75 is positioned in the drive coil 80 over the entire range.

More specifically, the stroke S or the like is set so as to satisfy the following conditions. First, the stroke of the driving coil 80 and S, the movable distance to one side L2 of the driving coil 80 and S _2, the movable distance to the other side L1 of the drive coil 80 and S _1, the stroke S and the movable distance S ₁ and S ₂ , the following formula S = S ₁ + S ₂
The relationship shown by is established.

Further, the dimension in the moving direction L of the driving coil 80 is CL, the dimension in the moving direction L of the magnetic plate 75 is PL, and the end of the one side L2 of the driving coil 80 in a state where the driving coil 80 has moved to the most one side L2. the dimensions from part to the magnetic plate 75 and ML _2, when the dimension from the end of the other side L1 of the drive coil 80 in a state in which the drive coil 80 is moved most to the other side L1 to the magnetic plate 75 and ML _1, the dimensions Between CL, PL, ML ₁ , and ML ₂ , the following relationship is satisfied: S ≦ ML ₁ ≦ CL-PL
S ≦ ML ₂ ≦ CL-PL
Holds. Since these conditions are satisfied, for example, as shown in FIG. 6E, even when the drive coil 80 moves to the most one side L2, the following condition S ≦ ML ₁
ML ₂ + PL ≦ CL
Holds. Further, as shown in FIG. 6 (f), even when the drive coil 80 is moved to the other side L1, the following condition S ≦ ML ₂
ML ₁ + PL ≦ CL
Holds. Therefore, even if the drive coil 80 moves from one side L2 to the other side L1 in the movement direction L, the magnetic plate 75 is positioned in the drive coil 80 over the entire range. Therefore, as shown in FIGS. 7F and 7G, the stroke of the drive coil 80 (movable body 5) can be set within a range in which a large thrust F can be applied to the movable body 5. it can.

(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 the present embodiment, compared with a stepping motor or a magnetic drive mechanism in which only a part of the drive coil faces the permanent magnet body, a large thrust can be generated even if the size is small, Regardless of the position of the movable body 5, a large thrust can be obtained stably.

  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.

  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 of a yoke is high, the board thickness of the base 20 and the cover 30 can be made thin. 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.

  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.

  Further, in this embodiment, since two plate members (the first plate 61 and the second plate 62) that face each other in the Y-axis direction are used as bobbins, compared with a configuration in which the drive coil 80 is wound around a cylindrical bobbin. The weight of the movable body 5 can be reduced. Further, between the drive coil 80 and the permanent magnet body 70, the first plate 61 and the second plate 62 are not interposed between the drive coil 80 and the permanent magnet body 70, and 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 Z-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.

  Moreover, each of the first plate 61 and the second plate 62 protrudes in the Z-axis direction (direction intersecting both the moving direction and the thickness direction of the permanent magnet body 70) at a position spaced apart in the X-axis direction. 614, 621 to 624, and the drive coil is wound around a region sandwiched between protrusions spaced apart in the X-axis direction. For this reason, the drive coil 80 can be wound around a predetermined position around the first plate 61 and the second plate 62. Further, the first plate 61 and the second plate 62 have a structure projecting in the X-axis direction from the drive coil 80. For this reason, even when the movable body 5 moves and the movable body 5 is brought into contact with the fixed body 2 side (side plate portions 22 and 23 of the base 20) to perform position regulation, the drive coil 80 is connected to the fixed body 2 side. There is no contact. Therefore, disconnection of the drive coil 80 can be prevented.

  In this embodiment, when the first bearing portion 512 is provided on one side of the movable body 5 in the Z-axis direction, the first holder member 51 is separately attached to the side surface of the drive coil 80 on the one side in the Z-axis direction. Is adopted. In this embodiment, when the second 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 second holder member 52 is provided on the other side surface of the drive coil 80 in the Z-axis direction. Separately, a retrofitted structure is adopted. For this reason, even when a voice coil directed to the opening in the X-axis direction (movement direction L) is used as the drive coil 80, the drive coil 80 can be used without using a member that protrudes from the drive coil 80 in the X-axis direction. The 1st bearing part 512, the 2nd bearing part 522, and the 3rd bearing part 523 can be provided in the range which exists in a X-axis direction. For this reason, since the dimension of the movable body 5 in the X-axis direction can be shortened, a large movable range of the movable body 5 in the X-axis direction can be ensured.

  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 direction of the drive coil 80 is interposed via the first plate 61 and the second plate 62. A structure is adopted in which the first holder member 51 is attached to one side surface, 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 plate 61 and the second plate 62. ing. 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. 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 this 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.

  Moreover, since the first holder member 51 and the second holder member 52 are fixed to the protrusions 611 to 614 and 621 to 624 of the first plate 61 and the second plate 62, the first holder member 51 and the second holder member 52 are used. 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.

  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 members (the first spring member 91 and the second spring member 92) are provided between the fixed body 2 and the movable body 5, they are caused by external forces such as vibrations and external impacts. The displacement of the movable 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 external impact.

  Further, since the first spring member 91 and the second spring member 92 are used as power feeding members to the drive coil 80, it is not necessary to separately provide power feeding members. 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 are provided with respect to the first bearing portion 512 that protrudes in the direction orthogonal to the moving direction L in the movable body 5 and the first bearing portion 512 in the fixed body 2. It is a coil spring arranged between the side plate portions 22 and 23 (fixed body side spring receiving portions) facing 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.

  In addition, the first spring member 91 and the second spring member 92 are provided around a portion of the first guide shaft 41 located between the first bearing portion 512 and the side plate portions 22 and 23 (fixed body side spring receiving portions). Therefore, it is not necessary to separately secure a place where the first spring member 91 and the second spring member 92 are provided. Therefore, the optical element driving device 200 and the linear driving device 100 can be reduced in size and thickness.

  Further, 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, while the side of the movable body 5 that is positioned at the first bearing portion 512 is provided. On the opposite side, two bearing portions (second bearing portion 522 and third bearing portion 523) protruding 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. Moreover, since the movable body 5 is supported at one point on the side where the first spring member 91 and the second spring member 92 are disposed, the first spring member 91 and the second spring member 92 are disposed on the movable body 5. The first bearing portion 512 with respect to the first guide shaft 41 may be provided at one location on the side where there is a space. For this reason, since a long coil spring can be used as the first spring member 91 and the second spring member 92, it is easy to adjust the urging force of the first spring member 91 and the second spring member 92.

  In the movable body 5, the optical element 1 is provided on the opposite side in the Z-axis direction with respect to the first spring member 91 and the second spring member 92. For this reason, it is not necessary to provide a protruding portion (first bearing portion 512) or a fixed body side spring receiving portion (side plate portions 22, 23) on the side where the optical element 1 is provided. Therefore, the optical path of the optical element 1 can be easily secured.

[Modification of Embodiment 1]
FIG. 8 is an explanatory diagram showing a dimensional configuration of the magnetic drive mechanism 7 used in the optical element driving device 200 and the linear driving device 100 according to the modification of the first embodiment of the present invention, and FIG. Is an explanatory diagram of the magnetic drive mechanism 7, FIGS. 8B and 8C are explanatory diagrams of the permanent magnet body 70 and the drive coil, and FIGS. 8D to 8F are permanent magnets provided on the fixed body 2 side. It is explanatory drawing which shows each dimension in the state which the drive coil 80 provided in the movable body 5 side with respect to the body 70 moved relatively. Since the basic configuration of this embodiment is the same as that of Embodiment 1, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIGS. 8A, 8 </ b> B, and 8 </ b> C, in the magnetic driving mechanism 7 used in the optical element driving device 200 and the linear driving device 100 of this embodiment, a permanent magnet body provided on the fixed body 2 side. 70 includes a plurality of magnet pieces (a first magnet piece 71 and a second magnet piece 72) arranged along the moving direction L, and a magnetic plate 75 provided between adjacent magnet pieces. Moreover, the 1st magnet piece 71 and the 2nd magnet piece 72 are arrange | positioned toward the magnet piece of the other party with the same pole.

  In this embodiment, yokes 710 and 720 are provided on both sides of the permanent magnet body 70, and the yokes 710 and 720 are in contact with the side plate portions 22 and 23 of the base 20. For this reason, the yokes 710 and 720 and the base 20 together form a magnetic path.

  Also in this embodiment, the movable body 5 includes the drive coil 80 (cylindrical coil) facing the opening in the movement direction L, and as shown in FIGS. 8D, 8E, and 8F, the drive is performed. The coil 80 moves in the moving direction L as a part of the movable body 5. Here, FIG. 8D is an explanatory diagram of a state in which the drive coil 80 is in the middle of the movement direction L, and FIG. 8E is a diagram illustrating the drive coil 80 on the most side L2 side in the movement direction L. FIG. 8F is an explanatory diagram of a state in which the drive coil 80 has moved to the other side L1 in the moving direction L. FIG.

  When such an operation is performed, also in this embodiment, the stroke S and the like are set so that the magnetic plate 75 is positioned within the movable range of the drive coil 80 as in the first embodiment. That is, even if the drive coil 80 moves from one side L2 to the other side L1 in the movement direction L, the stroke S and the like are configured so that the magnetic plate 75 is positioned in the drive coil 80.

More specifically, the stroke of the driving coil 80 and S, the movable distance to one side L2 of the driving coil 80 and S _2, the movable distance to the other side L1 of the drive coil 80 and S _1, the stroke Between S and the movable distances S ₁ and S ₂ , the following formula is used: S = S ₁ + S ₂
The relationship shown by is established.

Further, the dimension in the moving direction L of the driving coil 80 is CL, the dimension in the moving direction L of the magnetic plate 75 is PL, and the end of the one side L2 of the driving coil 80 in a state where the driving coil 80 has moved to the most one side L2. the dimensions from part to the magnetic plate 75 and ML _2, when the dimension from the end of the other side L1 of the drive coil 80 in a state in which the drive coil 80 is moved most to the other side L1 to the magnetic plate 75 and ML _1, the dimensions Between CL, PL, ML ₁ , and ML ₂ , as in the first embodiment, the following relationship S ≦ ML ₁ ≦ CL-PL
S ≦ ML ₂ ≦ CL-PL
Holds. Since these conditions are satisfied, for example, as shown in FIG. 8 (e), even when the drive coil 80 moves to the one side L2, the following condition S ≦ ML ₁
ML ₂ + PL ≦ CL
Holds. Further, as shown in FIG. 8 (f), even when the drive coil 80 moves to the other side L1, the following condition S ≦ ML ₂
ML ₁ + PL ≦ CL
Holds. Therefore, even if the drive coil 80 moves from one side L2 to the other side L1 in the movement direction L, the magnetic plate 75 is positioned in the drive coil 80 over the entire range. Therefore, also in the present embodiment, a large thrust F can be applied to the movable body 5 regardless of the position of the movable body 5 as in the first embodiment.

[Embodiment 2]
FIG. 9 is an explanatory diagram of the magnetic driving mechanism 7 used in the optical element driving device 200 and the linear driving device 100 according to the second embodiment of the present invention, and FIG. 9A shows the magnetic flux density of the permanent magnet body 71. FIGS. 9B to 9F are explanatory views showing a state in which the drive coil 80 provided on the movable body 5 side moves relative to the permanent magnet body 70 provided on the fixed body 2 fixed body 2 side. FIG. 9G is an explanatory diagram showing a simulation result of the relationship between the position of the drive coil 80 and the thrust F. FIG. FIG. 10 is an explanatory diagram showing a dimensional configuration of the magnetic driving mechanism 7 used in the optical element driving device 200 and the linear driving device 100 according to Embodiment 2 of the present invention, and FIG. FIGS. 10B and 10C are explanatory diagrams of the mechanism 7, FIGS. 10B and 10C are explanatory diagrams of the permanent magnet body 70 and the drive coil, and FIGS. 10D to 10F are diagrams of the permanent magnet body 70 provided on the fixed body 2 side. On the other hand, it is explanatory drawing which shows each dimension in the state which the drive coil 80 provided in the movable body 5 side moved relatively. Since the basic configuration of this embodiment is the same as that of Embodiment 1, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  In the first embodiment, attention is paid to the magnetic plate 75 as a portion where the magnetic flux concentrates in the permanent magnet body 71. In the present embodiment, however, the magnetic pieces 71 and 72 move from the magnetic flux density examination result shown in FIG. Attention is also paid to regions 711 and 722 adjacent to the magnetic plate 75 on both sides in the direction L, and a stroke or the like is set with the region including the regions 711 and 721 and the magnetic plate 75 as a thrust generation region 700. That is, in the permanent magnet body 70, the magnetic flux is concentrated on the magnetic plate 75, and the magnetic flux is also concentrated in the regions 711 and 722 adjacent to the magnetic plate 75 on both sides in the magnet pieces 71 and 72. For this reason, as shown in FIGS. 9B to 9F, when the drive coil 80 moves, as shown in FIG. 9G, the thrust generation region 700 including the regions 711 and 721 and the magnetic plate 75 is formed. The thrust F is high in a state (the state shown in FIGS. 9C, 9D, and 9E) located in the drive coil 80.

  Therefore, in this embodiment, the stroke S and the like are set so that the thrust generation region 700 is positioned within the movable range of the drive coil 80, as will be described below with reference to FIG. That is, even if the drive coil 80 moves from the one side L2 in the movement direction L to the other side L1, the stroke S and the like are configured so that the thrust generation region 700 is located in the drive coil 80.

  As shown in FIGS. 10A, 10 </ b> B, and 10 </ b> C, in the magnetic drive mechanism 7 used in the optical element driving device 200 and the linear driving device 100 of the present embodiment, as in the first embodiment, a fixed body is used. The permanent magnet body 70 provided on the second side has a plurality of magnet pieces (first magnet piece 71 and second magnet piece 72) arranged along the moving direction L and magnetism provided between adjacent magnet pieces. And a plate 75. In addition, the first magnet piece 71 and the second magnet piece 72 are arranged with the same pole facing the counterpart magnet piece, and in the magnet pieces 71 and 72, regions 711 adjacent to the magnetic plate 75 on both sides, The thrust generation region 700 is constituted by the magnetic plate 722 and the magnetic plate 722.

  Here, the thrust generation region 700 is set to be more than 1 time and 3 times or less of the dimension in the moving direction L of the magnetic plate 75.

  Also in this embodiment, as in the first embodiment, the movable body 5 includes a drive coil 80 (cylindrical coil) facing the opening in the moving direction L, and FIGS. 10 (d), 10 (e), As shown in (f), the drive coil 80 moves in the movement direction L as a part of the movable body 5. Here, FIG. 10D is an explanatory diagram of a state in which the drive coil 80 is in the middle of the movement direction L, and FIG. 10E is a diagram illustrating the drive coil 80 on the most side L2 side in the movement direction L. FIG. 10F is an explanatory diagram of a state in which the drive coil 80 has moved to the other side L1 in the moving direction L. FIG.

In such magnetic drive mechanism 7, the stroke of the driving coil 80 and S, the movable distance to one side L2 of the driving coil 80 and S _2, the movable distance to the other side L1 of the drive coil 80 and S _1, the stroke Between S and the movable distances S ₁ and S ₂ , the following formula is used: S = S ₁ + S ₂
The relationship shown by is established.

In addition, the dimensions of the regions 711 and 722 in the moving direction are both Rs, the dimension of the driving coil 80 in the moving direction L is CL, the dimension of the magnetic plate 75 in the moving direction L is PL, and the driving coil 80 is on the most side. the dimension from the end of one side L2 of the driving coil 80 in a state that has moved to the L2 to the magnetic plate 75 and ML _2, the end of the other side L1 of the drive coil 80 in a state in which the drive coil 80 is moved most other side L1 dimensions to the magnetic plate 75 when the ML ₁ from parts, dimensions Rs, CL, PL, ML _1, between the ML _2, the following relationship _{S + Rs ≦ ML 1 ≦ CL-} (PL + Rs)
S + Rs ≦ ML ₂ ≦ CL− (PL + Rs)
Holds. Since these conditions are satisfied, for example, as shown in FIG. 10 (e), even when the drive coil 80 moves to the most one side L2, the following condition S + Rs ≦ ML ₁
ML ₂ + (PL + Rs) ≦ CL
Holds. Further, as shown in FIG. 10 (f), even when the drive coil 80 moves to the other side L1, the following condition S + Rs ≦ ML ₂
ML ₁ (PL + Rs) ≦ CL
Holds. Therefore, even if the drive coil 80 moves from one side L2 to the other side L1 in the movement direction L, the thrust generation region 700 (regions 711 and 722 and the magnetic plate 75) is located in the drive coil 80 over the entire range. . Therefore, in this embodiment, a large thrust F can be applied to the movable body 5 regardless of the position of the movable body 5, and the magnitude of the thrust F is larger than that of the first embodiment.

Further, the thrust generation region 700 is set to be more than 1 time and 3 times or less of the dimension in the moving direction L of the magnetic plate 75. That is, the dimensions Rs and PL have the following relationship Rs <PL
Holds. Even if the thrust generation region 700 is set to an excessively long dimension, the effect of effectively using the magnetic field formed by the permanent magnet body 70 is not improved, while the thrust generation region 700 having a long dimension is positioned within the movable range of the drive coil 80. In order to do so, restrictions such as narrowing the moving range of the movable body 5 occur. Therefore, in this embodiment, the upper limit of the dimension in the moving direction of the thrust generation region 700 is set to three times the dimension of the magnetic plate 75.

[Modification of Embodiment 2]
FIG. 11 is an explanatory diagram showing a dimensional configuration of the magnetic drive mechanism 7 used in the optical element driving device 200 and the linear driving device 100 according to the modification of the second embodiment of the present invention. 11 is an explanatory view of the magnetic drive mechanism 7, FIGS. 11B and 11C are explanatory views of the permanent magnet body 70 and the drive coil, and FIGS. 11D to 11F are permanent magnets provided on the fixed body 2 side. It is explanatory drawing which shows each dimension in the state which the drive coil 80 provided in the movable body 5 side with respect to the body 70 moved relatively. Since the basic configuration of this embodiment is the same as that of Embodiments 1 and 2, common portions are given the same descriptions and explanations thereof are omitted.

  As shown in FIGS. 11A, 11B, and 11C, in the magnetic driving mechanism 7 used in the optical element driving device 200 and the linear driving device 100 of the present embodiment, the permanent magnet body provided on the fixed body 2 side. 70 includes a plurality of magnet pieces (a first magnet piece 71 and a second magnet piece 72) arranged along the moving direction L, and a magnetic plate 75 provided between adjacent magnet pieces. Moreover, the 1st magnet piece 71 and the 2nd magnet piece 72 are arrange | positioned toward the magnet piece of the other party with the same pole. Further, in the magnet pieces 71 and 72, the thrust generation region 700 is formed by the regions 711 and 722 adjacent to the magnetic plate 75 on both sides in the moving direction L and the magnetic plate 75.

  In this embodiment, yokes 710 and 720 are provided on both sides of the permanent magnet body 70, and the yokes 710 and 720 are in contact with the side plate portions 22 and 23 of the base 20. For this reason, the yokes 710 and 720 and the base 20 together form a magnetic path.

  Also in this embodiment, as in Embodiments 1 and 2, the movable body 5 includes a drive coil 80 (cylindrical coil) facing the opening in the movement direction L, and FIGS. 11 (d), 11 (e), As shown in (f), the drive coil 80 moves in the movement direction L as a part of the movable body 5. Here, FIG. 11D is an explanatory diagram of a state in which the drive coil 80 is in the middle of the movement direction L, and FIG. 11E is a diagram illustrating the drive coil 80 on the most side L2 side in the movement direction L. FIG. 11F is an explanatory diagram of a state in which the drive coil 80 has moved to the other side L1 in the moving direction L. FIG.

  When such an operation is performed, also in this embodiment, the thrust generation region 700 (regions 711 and 722 adjacent to the magnetic plate 75 on both sides in the magnet pieces 71 and 72 and the magnetic plate 75) as in the second embodiment. Is set such that the stroke S is located within the movable range of the drive coil 80. That is, even if the drive coil 80 moves from the one side L2 in the movement direction L to the other side L1, the stroke S and the like are configured so that the thrust generation region 700 is located in the drive coil 80.

More specifically, the stroke of the driving coil 80 and S, the movable distance to one side L2 of the driving coil 80 and S _2, the movable distance to the other side L1 of the drive coil 80 and S _1, the stroke Between S and the movable distances S ₁ and S ₂ , the following formula is used: S = S ₁ + S ₂
The relationship shown by is established.

In addition, the dimensions of the regions 711 and 722 in the moving direction are both Rs, the dimension of the driving coil 80 in the moving direction L is CL, the dimension of the magnetic plate 75 in the moving direction L is PL, and the driving coil 80 is on the most side. the dimension from the end of one side L2 of the driving coil 80 in a state that has moved to the L2 to the magnetic plate 75 and ML _2, the end of the other side L1 of the drive coil 80 in a state in which the drive coil 80 is moved most other side L1 dimensions to the magnetic plate 75 when the ML ₁ from parts, dimensions Rs, CL, PL, ML _1, between the ML _2, as in the second embodiment, the following relationship _{S + Rs ≦ ML 1 ≦ CL-} (PL + Rs )
S + Rs ≦ ML ₂ ≦ CL− (PL + Rs)
Holds. Since these conditions are satisfied, for example, as shown in FIG. 11 (e), even when the drive coil 80 has moved to the one side L2, the following condition S + Rs ≦ ML ₁
ML ₂ + (PL + Rs) ≦ CL
Holds. Further, as shown in FIG. 11 (f), even when the drive coil 80 moves to the other side L1, the following condition S + Rs ≦ ML ₂
ML ₁ (PL + Rs) ≦ CL
Holds. Therefore, even if the drive coil 80 moves from one side L2 to the other side L1 in the movement direction L, the thrust generation region 700 (regions 711 and 722 and the magnetic plate 75) is located in the drive coil 80 over the entire range. . Therefore, in this embodiment, a large thrust F can be applied to the movable body 5 regardless of the position of the movable body 5.

[Improvements of Embodiments 1 and 2]
FIG. 12 is an explanatory diagram showing a dimensional configuration of the magnetic drive mechanism 7 used in the optical element driving device 200 and the linear driving device 100 according to the improvements of the first and second embodiments of the present invention. (a)-(c) is explanatory drawing which shows a mode that the drive coil 80 provided in the movable body 5 side moved relatively with respect to the permanent magnet body 70 provided in the fixed body 2 side. Since the basic configuration of this embodiment is the same as that of Embodiments 1 and 2, common portions are given the same descriptions and explanations thereof are omitted.

  12A, 12B, and 12C, the permanent magnet body provided on the fixed body 2 side in the magnetic drive mechanism 7 used in the optical element driving device 200 and the linear driving device 100 of the present embodiment. 70 includes a plurality of magnet pieces (a first magnet piece 71 and a second magnet piece 72) arranged along the moving direction L, and a magnetic plate 75 provided between adjacent magnet pieces. Moreover, the 1st magnet piece 71 and the 2nd magnet piece 72 are arrange | positioned toward the magnet piece of the other party with the same pole. The movable body 5 includes a drive coil 80 (cylindrical coil) facing the opening in the moving direction L. As shown in FIGS. 12A, 12B, and 12C, the drive coil 80 is movable. It moves in the movement direction L as a part of the body 5. Here, FIG. 12B is an explanatory diagram of a state where the center in the moving direction L of the permanent magnet body 70 (the center of the magnetic plate 75) and the center in the moving direction L of the drive coil 80 overlap. 12 (c) is an explanatory view of a state in which the drive coil 80 has moved to the most L1 side in the movement direction L. FIG. 12 (a) shows the drive coil 80 in the most L1 side in the movement direction L. It is explanatory drawing of the state which moved.

  When such an operation is performed, in this embodiment, the extreme ends 715 and 725 on both sides in the moving direction L of the region where the magnet pieces 71 and 72 are arranged in the permanent magnet body 70 are the movable range of the drive coil 80. Located outside of. That is, the drive coil 80 is located on the inner side from the outermost ends 715 and 725 in the region where the magnet pieces 71 and 72 are arranged in the entire movable range, and does not come off the outer side. For this reason, the magnetic field formed by the permanent magnet body 70 can be used more effectively.

[Other embodiments]
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, 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, only 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, it is only necessary to control the current value energized to the drive coil 80 and the spring constant of the spring member. 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 spring members (the first spring member 91 and the second spring member 92) are provided on the movable body 5, but a configuration in which no spring member is used may be employed. In this case, it is preferable to employ a configuration in which a position detection system using a Hall element, a magnetic sensor, or the like is 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-described embodiment, the configuration using the guide shaft is adopted. However, a plate spring having strong lateral rigidity may be used as a spring member, and the movable body 5 may be supported by the plate spring. According to this configuration, the guide shaft can be eliminated.

  In the above embodiment, the first plate 61 and the second plate 62 are used as stoppers, and the drive coil 80, the first holder member 51, and the second holder member 52 are integrated, but the first plate A configuration in which 61 and the second plate 62 are not used may be employed. In this case, a configuration may be adopted in which the shapes of the first holder member 51 and the second holder member 52 are changed and the first holder member 51 and the second holder member 52 are used as stoppers. 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. Adopt it.

DESCRIPTION OF SYMBOLS 1 Optical element 2 Fixed body 5 Movable body 7 Magnetic drive mechanism 20 Base (yoke)
22, 23 Base side plate (fixed body side spring support)
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 2nd spring member 100 Linear drive device 200 Optical element drive device 512 1st bearing part 522 2nd bearing part 523 3rd bearing part 524 Element holding | maintenance part 700 Thrust generating area | region 715,725 The most of the area | region where the magnet piece is arrange | positioned edge

Claims (5)

A linear drive device that linearly moves the movable body relative to the fixed body,
Between the fixed body and the movable body, a permanent magnet body held on the fixed body side, and a drive coil held on the movable body side so as to leave a gap between the permanent magnet body, Comprising a magnetic drive mechanism,
The permanent magnet body includes a plurality of magnet pieces arranged along the moving direction, and a magnetic plate provided between the adjacent magnet pieces,
The magnet pieces adjacent to each other in the plurality of magnet pieces are arranged with the same pole facing the counterpart magnet piece,
The drive coil is a cylindrical coil wound around the permanent magnet body with a gap between the permanent magnet body and the opening in the moving direction.
The linear drive device according to claim 1, wherein the magnetic plate is located within a movable range of the drive coil.   The region adjacent to the magnetic plate on both sides in the moving direction in the magnet piece and the thrust generation region made of the magnetic plate are located within the movable range of the drive coil. The linear drive device described.   3. The linear drive device according to claim 2, wherein a dimension of the thrust generation region in the moving direction is more than 1 time and not more than 3 times of a dimension of the magnetic plate in the moving direction.   4. The end portion on both sides in the moving direction of the region where the magnet piece is arranged in the permanent magnet body is located outside the movable range of the drive coil. 5. The linear drive device according to one item. An optical element driving device comprising the linear driving device according to any one of claims 1 to 4,
An optical element driving apparatus, wherein an optical element is held on the movable body.

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