JP6884644B2 - Drive and optical equipment - Google Patents

Description

The present invention relates to a drive device for driving a holding member for holding an optical element such as a lens by using a rack and a lead screw, and an optical device including the drive device.

In an imaging device such as a digital camera, a technique of engaging a rack attached to a holding member for holding an optical element such as a lens or an optical filter with a lead screw and driving the holding member in the optical axis direction in response to rotation of the lead screw. It has been known.

Conventionally, for example, a first rack member rotatably supported at both ends by a holding member and a second rack rotatably supported at both ends by a first rack member and arranged to face the first rack member in the radial direction of the reed screw. It has been proposed that a rack is composed of members.

In this proposal, the torsion coil spring urges the main tooth portion of the first rack member toward the lead screw with the urging force F1, and the spring member leads the opposing tooth portion of the second rack member with the urging force F2 (> F1). It is urging toward the screw. In this state, the main tooth portion of the first rack member is engaged with the lead screw, and the opposing tooth portion of the second rack member is arranged apart from the lead screw.

Then, when a load for disengaging the main tooth portion of the first rack member and the lead screw is applied in the axial direction of the lead screw due to an impact such as dropping, the opposing tooth portion of the second rack member engages with the lead screw. As a result, the engagement state between the rack and the lead screw is ensured.

Further, the urging force F2 for urging the facing tooth portion of the second rack member toward the reed screw is set to be smaller than the force F3 for damaging at least one of the main tooth portion and the reed screw of the first rack member. There is.

As a result, when a force larger than the urging force F2 is applied, the second rack member is prevented from rotating in the direction away from the lead screw to damage the first rack member or the lead screw, and the first rack member is bitten. It is said that it can be prevented (Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-252288

However, in Patent Document 1, the work of assembling the second rack member and the spring member to the first rack member and integrating them and the work of assembling the integrated first rack member to the holding member together with the torsion coil spring are performed in a plurality of directions. Must be done from. Therefore, the workability is poor, it takes time, and the assembly cost may increase.

Specifically, the work of engaging the pair of shaft portions of the first rack member with the pair of engaging holes of the second rack member, and the work of engaging the spring member with the first rack member and the second rack member. The direction of work is different.

Further, when the shafts at both ends of the first rack member are fitted into the pair of shaft holes of the holding member, one shaft of the first rack member is fitted with a pair of shaft holes in the notch formed in the shaft hole of one of the holding members. It is necessary to insert it diagonally with respect to the axis of. Further, after inserting one shaft of the first rack member into one shaft hole of the holding member via the notch, the other shaft of the first rack member is paired with respect to the other shaft hole of the holding member. It is necessary to insert from the axial direction of the shaft hole of.

Further, work in the direction of hooking one end of the torsion coil spring to the holding member and work in the direction of hooking the other end of the torsion coil spring to the first rack member are required. In this case, a work error is likely to occur in which both ends of the coil spring come off from the spring hooking portion during assembly.

Therefore, in the present invention, the work of assembling the second rack member and the torsion coil spring to the first rack member and integrating them, and the work of assembling the integrated first rack member together with the torsion coil spring to the holding member are unidirectional operations. We provide the technology to be realized in.

In order to achieve the above object, the drive device of the present invention is rotatably supported by a holding member for holding an optical element, a drive unit having a feed screw, and the holding member, and engages with the feed screw. , The rack that converts the rotation of the feed screw into the axial movement of the holding member and the two coil portions that are externally inserted into the rack are connected by the first spring end portion, and the second spring end portions are connected to both ends. And a torsion coil spring provided with a third spring end, the rack faces the first rack member that engages with the feed screw and the feed screw in the radial direction. When the first rack member is rotatably and axially movablely inserted into the first rack member and is displaced in a direction in which the first rack member is disengaged from the feed screw. The torsion coil spring has a second rack member that engages with the feed screw, and the first spring end portion is hooked on a first spring hooking portion provided on the first rack member. The two spring end portions are hooked on the second spring hooking portion provided on the second rack member, the third spring end portion is hooked on the third spring hooking portion provided on the holding member, and the first spring is hooked. The second rack member is urged against the first rack member in the direction of the feed screw by the end portion and the second spring end portion, and the first spring end portion and the third spring end portion urge the second rack member in the direction of the feed screw. The first rack member is urged against the holding member in the direction of the feed screw, and at least one of the two coil portions causes the first rack member and the second rack member to axis with each other. It is characterized in that it is urged in a direction away from the direction.

According to the present invention, the work of assembling the second rack member and the torsion coil spring to the first rack member and integrating them, and the work of assembling the integrated first rack member together with the torsion coil spring to the holding member are unidirectional operations. Can be realized with.

It is a perspective view of the lens driving device which is an example of embodiment of this invention. (A) is an exploded perspective view of the rack, (b) is a perspective view of the rack assembly, and (c) is a perspective view of the rack assembly shown in (b) as viewed from the opposite side. (A) is a perspective view of the Reds moving frame, and (b) is a perspective view of the lens moving frame shown in (a) viewed from different angles. (A) is a perspective view showing a state in which a torsion coil spring is attached to a facing tooth rack, (b) is a state in which a main tooth rack is inserted into a facing tooth rack, and (c) is an assembly of the main tooth rack and the facing tooth rack. It is a perspective view which shows the later state. (A) to (c) are side surface portions of FIGS. 4 (a) to 4 (c). (A) to (c) are views seen in the axial direction from the mounting shaft side of FIGS. 4 (a) to 4 (c). It is a perspective view explaining the assembling method of a rack and a lens moving frame. FIG. 7 is a diagram showing a state in which FIG. 7 is viewed from different directions. FIG. 7 is a diagram showing a state in which FIG. 7 is viewed from different directions. FIG. 7 is a diagram showing a state in which FIG. 7 is viewed from different directions.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a lens driving device which is an example of an embodiment of the present invention. FIG. 2A is an exploded perspective view of the rack, FIG. 2B is a perspective view of the rack assembly, and FIG. 2C is a perspective view of the rack assembly shown in FIG. 2B as viewed from the opposite side. It is a figure. FIG. 3A is a perspective view of the Reds moving frame, and FIG. 3B is a perspective view of the lens moving frame shown in FIG. 3A as viewed from different angles. In this embodiment, the lens drive device used for the lens barrel of an image pickup device such as a digital camera is exemplified, but the drive device may be a drive device used for an optical device other than the image pickup device.

As shown in FIG. 1, the lens driving device of the present embodiment includes a lens moving frame 5 that holds a lens L as an example of an optical element, and a rack 4 can rotate together with a torsion coil spring 3 in the lens moving frame 5. Attached to. In the present embodiment, the lens is exemplified as an example of the optical element, but the present invention is not limited to this, and various optical filters and the like may be used.

The lens moving frame 5 is movably supported by the guide bar 6 in the optical axis direction of the lens L, and is driven by the main tooth portion 1a (see FIG. 2C) of the rack 4 urged by the torsion coil spring 3. It engages with a lead groove (not shown) of the lead screw 7a constituting the portion 8. In the drive unit 8, a reed screw (feed screw) 7a, which is rotationally driven by the motor 7, is rotatably supported on the motor base 7b. When the lead screw 7a is rotationally driven by the motor 7, the rotation of the lead screw 7a is converted into the movement of the lens moving frame 5 in the optical axis direction via the rack 4. The lens moving frame 5 corresponds to an example of the holding member of the present invention.

As shown in FIG. 2, the rack 4 includes a main tooth rack 1, an opposing tooth rack 2, and a torsion coil spring 3. The tooth rack 1 is provided with a tooth portion 1a that engages with the lead groove of the lead screw 7a of the drive unit 8 during use. The facing tooth rack 2 has a facing tooth portion that engages with the lead groove of the lead screw 7a when the main tooth portion 1a of the main tooth rack 1 is displaced in a direction away from the lead groove of the lead screw 7a due to an impact or the like. 2a is provided. The main tooth rack 1 corresponds to an example of the first rack member of the present invention, and the opposed tooth rack 2 corresponds to an example of the second rack member of the present invention.

The facing tooth portions 2a are provided so as to sandwich the lead screw 7a with the main tooth rack 1 so as to face each other in the radial direction of the lead screw 7a, and are arranged apart from the lead screw 7a during normal use. The main tooth rack 1 is provided with a shaft portion 1c, and the facing tooth rack 2 is provided with a tubular portion 2c. By inserting the shaft portion 1c into the hole portion 2d of the tubular portion 2c in the axial direction, the main tooth rack 1 is supported so as to be relatively rotatable around a rotation axis parallel to the optical axis with respect to the facing tooth rack 2. Tooth.

The torsion coil spring 3 has two coil portions 3d and 3e coaxially arranged with each other, and the two coil portions 3d and 3e are connected via a spring end portion 3a. Further, spring end portions 3b and 3c are provided at both ends of the torsion coil spring 3, respectively, and the coil portion 3d is arranged between the spring end portion 3a and the spring end portion 3b, and the spring end portion 3a and the spring end are arranged. A coil portion 3e is arranged between the portion 3c and the portion 3c. The spring end portion 3a corresponds to an example of the first spring end portion of the present invention, the spring end portion 3b corresponds to an example of the second spring end portion of the present invention, and the spring end portion 3c corresponds to the first spring end portion of the present invention. 3 Corresponds to an example of the spring end.

In the torsion coil spring 3, only the coil portion 3e is axially inserted between the main tooth rack 1 and the opposing tooth rack 2 in a state where the coil portions 3d and 3e are extrapolated to the outer peripheral portion of the tubular portion 2c of the opposing tooth rack 2. It is installed in a compressed state. The spring end portion 3a of the torsion coil spring 3 is hooked on the spring hooking portion 1d of the main tooth rack 1, and the spring end portion 3b is hooked on the spring hooking portion 2e of the opposing tooth rack 2. The spring hooking portion 1d corresponds to an example of the first spring hooking portion of the present invention, and the spring hooking portion 2e corresponds to an example of the second spring hooking portion of the present invention.

The opposing tooth rack 2 is urged against the main tooth rack 1 by an elastic force acting between the spring end portion 3a and the spring end portion 3b in the rotational direction around the shaft portion 1c, and is provided on the opposing tooth rack 2. The contact portion 2f is brought into contact with the contact portion 1e provided on the main tooth rack 1. The main tooth rack 1 is provided with a mounting shaft 1b for mounting on the lens moving frame 5, and the facing tooth rack 2 is provided with a mounting shaft 2b for mounting on the lens moving frame 5 coaxially with the mounting shaft 1b. There is.

The rack 4 is rotatably supported with respect to the lens moving frame 5 via the mounting shaft 1b and the mounting shaft 2b, and the spring end portion 3c is attached to the spring hooking portion 5e (see FIG. 3) of the lens moving frame 5, which will be described later. It will be stopped. In the rack 4, the elastic force acting between the spring end 3a and the spring end 3b causes the tooth 1a of the tooth rack 1 to engage with the lead groove of the lead screw 7a with respect to the lens moving frame 5. Be urged. The main tooth rack 1 and the opposing tooth rack 2 are urged by the coil portion 3e in a direction away from each other in the axial direction of the shaft portion 1c. The spring hooking portion 5e corresponds to an example of the third spring hooking portion of the present invention.

In the present embodiment, of the coil portions 3d and 3e, the coil portion 3d is formed by close winding so that an elastic force is not generated in the axial direction of the shaft portion 1c, but the shaft is similar to the coil portion 3e. An elastic force may be generated in the direction of the portion 1c.

In the present embodiment, since the torsion coil spring 3 has a shape in which two coil portions 3d and 3e are connected to each other, the rack 4 is urged against the lens moving frame 5 in the direction of the lead screw 7a, which has been conventionally required. There is no need to separately provide a spring member. Therefore, it is not necessary to hang the spring member that urges the rack 4 in the direction of the lead screw 7a on the lens moving frame.

Further, the main tooth rack 1 has a stopper 1f that regulates the facing tooth rack 2 from being separated by a predetermined interval or more in a direction opposite to the direction in which the shaft portion 1c is inserted into the hole portion 2d of the tubular portion 2c during use. Is provided. The stopper 1f is provided with a contact portion 1h, and the facing tooth rack 2 is provided with a contact portion 2g. When the main tooth rack 1 and the opposing tooth rack 2 are separated from each other by a predetermined distance in the axial direction of the shaft portion 1c during use, the contact portion 1h of the stopper 1f and the contact portion 2g come into contact with each other and face the main tooth rack 1. It regulates the distance from the tooth rack 2 to be further widened. The stopper 1f corresponds to an example of the first stopper of the present invention.

Here, the predetermined interval means that when the main tooth portion 1a of the main tooth rack 1 is engaged with the lead groove of the lead screw 7a during normal use, the opposing tooth portion 2a of the opposing tooth rack 2 is a lead screw. This is an interval at which the lead groove of 7a is not engaged. The permissible spacing is at least an amount smaller than the pitch of the lead grooves of the lead screw 7a.

The stopper 1f is provided with an inclined portion 1g that is inclined with respect to the axial direction of the shaft portion 1c, and the inclined portion 1g guides the spring end portion 3a to the spring hooking portion 1d at the time of assembly. Further, the main tooth rack 1 abuts in the axial direction on the contact portion 5f (see FIG. 3) of the lens moving frame 5, and the main tooth rack 1 and the opposing tooth rack 2 make the shaft portion 1c into the tubular portion 2c during use. A stopper 1i is provided to prevent the lens from approaching a predetermined interval or more in the direction of insertion into the hole 2d. The stopper 1i corresponds to an example of the second stopper of the present invention.

As shown in FIG. 3, the lens moving frame 5 is provided with rack support portions 5a and 5b, and the rack support portions 5a and 5b are provided with engagement hole portions 5c and 5d. In the rack 4, the mounting shaft 1b of the main tooth rack 1 and the mounting shaft 2b of the opposing tooth rack 2 are inserted into the pair of engaging holes 5c and 5d of the lens moving frame 5, whereby the lens moving frame 5 is It is rotatably supported via the mounting shafts 1b and 2b.

Since the rack 4 is rotatably supported with respect to the lens moving frame 5, even if the lead screw 7a has a runout during rotation, it is possible to prevent this runout from being transmitted to the lens moving frame 5, and the lens. The moving frame 5 can be driven satisfactorily. Further, the coil portion 3e of the torsion coil spring 3 urges the main tooth rack 1 in the direction of the rack support portion 5a, and the opposing tooth rack 2 is urged in the direction of the rack support portion 5b. It is possible to prevent rattling.

A notch is formed in the engaging hole portion 5d in the insertion direction of the rack 4 when the rack 4 is assembled to the lens moving frame 5, and the mounting shaft 2b of the opposing tooth rack 2 is formed in the engaging hole portion 5d. A part of the cylindrical shape is notched according to the notch.

Here, in the present embodiment, as in the conventional case, the urging force F2 for urging the opposing tooth portions 2a of the opposing tooth rack 2 toward the lead screw 7a causes the main tooth portion 1a of the main tooth rack 1 to be led screw a. It is set to be larger than the urging force F1 that urges toward. Further, the urging force F2 is set to be smaller than the force F3 that damages at least one of the main tooth portion 1a and the lead screw 7a of the main tooth rack 1.

Next, a method of assembling the rack 4 will be described with reference to FIGS. 4 to 6. FIG. 4A is a perspective view showing a state in which the torsion coil spring 3 is attached to the opposing tooth rack 2, FIG. 4B is a state in which the main tooth rack 1 is inserted into the opposing tooth rack 2, FIG. 4C. Is a perspective view showing a state after assembly of the main tooth rack 1 and the opposing tooth rack 2. 5 (a) to 5 (c) are side surface portions of FIGS. 4 (a) to 4 (c). 6 (a) to 6 (c) are views taken in the axial direction from the mounting shaft 2b side of FIGS. 4 (a) to 4 (c).

In the present embodiment, the torsion coil spring 3 is inserted into the facing tooth rack 2 in the axial direction, and then the main tooth rack 1 is inserted into the facing tooth rack 2 in the axial direction, so that the rack 4 can be assembled in one direction. Realize.

First, as shown in FIGS. 4A to 6A, the coil portion 3e of the torsion coil spring 3 is inserted into the outer peripheral portion of the tubular portion 2c of the facing tooth rack 2. At this time, the spring end portions 3a, 3b, 3c and the coil portion 3e are in a natural state.

Next, as shown in FIGS. 4 (b) to 6 (b), the shaft portion 1c of the main tooth rack 1 is inserted into the hole portion 2d of the tubular portion 2c of the opposing tooth rack 2. At this time, in the main tooth rack 1, the stopper 1f comes into contact with the abutting portion 2f of the opposing tooth rack 2, so that the main tooth rack 1 is rotated about the axis of the shaft portion 1c with respect to the opposing tooth rack 2. Will be inserted.

Here, the coil portion 3e is axially compressed by the opposing tooth rack 2 and the stopper 1f, and the elastic force generated by the compression of the coil portion 3e is twisted between the spring end portion 3a and the spring end portion 3b by the inclined portion 1g. It is used for the force to change the angle from the natural state.

Since the inclined portion 1g is inclined with respect to the axial direction of the shaft portion 1c, the spring end portion 3a is inserted between the spring end portions 3a and 3b along the inclined portion 1g as the shaft portion 1c is inserted into the hole portion 2d. It is guided to the spring hooking portion 1d while changing the twist angle of. At this time, the spring end portion 3b is engaged in a state of being urged by the spring hooking portion 2e of the opposing tooth rack 2 by the elastic force generated by the change in the twist angle between the spring end portions 3a and 3b.

Further, when the shaft portion 1c of the main tooth rack 1 is inserted into the hole portion 2d of the opposing tooth rack 2, the stopper 1f is disengaged from the contact portion 2f, and the main teeth reach a position where the contact portion 1e and the contact portion 2f come into contact with each other. The rack 1 rotates about the axis with respect to the facing tooth rack 2 to be in the state shown in FIGS. 4 (c) to 6 (c).

As a result, the rack 4 can be assembled in one direction. That is, the work of inserting the torsion coil spring 3 into the facing tooth rack 2 and the work of inserting the main tooth rack 1 into the facing tooth rack 2 can be realized by working in the same direction. Further, the spring end portions 3a and 3b can be hooked on the spring hooking portions 1d and 2e at the same time as the work of inserting the main tooth rack 1 into the facing tooth rack 2.

Next, a method of assembling the rack 4 to the lens moving frame 5 will be described with reference to FIGS. 7 to 10. FIG. 7 (a) is a perspective view showing a state before assembly of the rack 4 and the lens moving frame 5, and FIG. 7 (b) shows the mounting shafts 1b and 2b of the rack 4 with the engaging holes 5c and 5d of the lens moving frame 5. It is a perspective view which shows the state before inserting into. FIG. 7 (c) is a perspective view showing a state after the mounting shafts 1b and 2b of the rack 4 are inserted into the engaging holes 5c and 5d of the lens moving frame 5, and FIG. 7 (d) shows the rack 4 and the lens moving frame. It is a perspective view which shows the state after assembling of 5. 8 (a) to 8 (d), FIGS. 9 (a) to 9 (d), and FIGS. 10 (a) to 10 (d) are shown in FIGS. 7 (a) to 7 (d), respectively. It is a figure which shows the state seen from different directions.

First, as shown in FIGS. 7A to 10A, the mounting shaft 2b of the rack 4 is inserted into the notch of the engaging hole 5d of the lens moving frame 5 from the direction of the arrow in the figure. At this time, the spring end portion 3c of the torsion coil spring 3 is provided at a position where the rack 4 comes into contact with the spring hook portion 5e when the rack 4 is brought close to the lens moving frame 5. Further, when the mounting shaft 2b of the rack 4 is inserted into the notch portion of the engaging hole portion 5d, the mounting shaft 1b of the rack 4 comes into contact with the rack support portion 5a of the lens moving frame 5.

Here, a torsion coil spring 3 is arranged between the main tooth rack 1 and the opposing tooth rack 2, and the shaft portion 1c is inserted into the hole portion 2d of the tubular portion 2c in the main tooth rack 1 and the opposing tooth rack 2. There is no stopper that regulates the distance between each other in the direction so that it does not change beyond a predetermined distance. Therefore, when the mounting shaft 1b comes into contact with the rack support portion 5a, as shown in FIGS. 7 (b) to 10 (b), the main tooth rack 1 moves to the opposing tooth rack 2 while compressing the torsion coil spring 3 in the axial direction. It is possible to move the shaft portion 1c in the direction of being inserted into the hole portion 2d. Therefore, in the state shown in FIGS. 7 (b) to 10 (b), the axial distance between the main tooth rack 1 and the opposing tooth rack 2 becomes smaller than the state after assembly.

Then, as shown in FIGS. 7 (c) to 10 (c), when the mounting shaft 2b is inserted to the position of the engaging hole portion 5d, the mounting shaft 1b is moved by the elastic force of the compressed torsion coil spring 3. The main tooth rack 1 moves in the opposite direction of the opposing tooth rack 2 while being inserted into the engaging hole portion 5c. After that, when the hand or the like is released from the rack 4, the rack 4 is placed at the center of the engaging holes 5c and 5d and the main tooth rack 1 is placed between the facing tooth rack 2 due to the elastic force acting between the spring end portions 3a and 3c. The lead screw 7a is rotated to an insertable mounting angle, and the state shown in FIGS. 7 (d) to 10 (d) is obtained.

As described above, in the present embodiment, the rack 4 is moved into the lens moving frame 5 together with the torsion coil spring 3 only by pushing the mounting shaft 2b of the rack 4 into the notch of the engaging hole portion 5d of the lens moving frame 5d. Can be assembled.

Further, the contact portion 5f has a contact surface 5g capable of axially contacting the stopper 1i at the mounting angle of the rack 4 at the time of assembly, and the contact portion 5f with respect to the stopper 1i at the mounting angle of the rack 4 at the time of use. Contact surfaces 5h that can be brought into contact with each other in the axial direction are provided at different positions in the rotation direction and the axial direction of the rack 4. In FIG. 10C, the contact surface 5g is at a position facing the stopper 1i at the mounting angle of the rack 4 at the time of assembly, and in FIG. 10D, the contact surface 5h is at the mounting angle of the rack 4 at the time of use. Is in a position facing the stopper 1i.

In the contact surface 5g, the mounting shaft 1b of the main tooth rack 1 of the rack 4 comes into contact with the rack support portion 5a at the time of assembly, and the main tooth rack 1 has the shaft portion 1c with respect to the facing tooth rack 2 with the hole portion 2d. It is provided at a position where it does not come into contact with the stopper 1i even if it moves in the insertion direction. Further, the contact surface 5h is provided at a position that restricts the main tooth rack 1 and the opposing tooth rack 2 from coming closer than a predetermined distance in the direction of inserting the shaft portion 1c into the hole portion 2d during use.

In this way, by having the contact surfaces at the two positions corresponding to the assembly and use, even if the position of the stopper 1i changes between the assembly and the use, the assembling property is improved and the main tooth rack is used. It is possible to realize both the regulation that the 1 and the facing tooth rack 2 are closer than a predetermined interval. As a result, the distance between the main tooth rack 1 and the opposing tooth rack 2 of the rack 4 is regulated by the stoppers in both axial directions of the shaft portion 1c at the time of use, and can be regulated within a predetermined distance range. As a result, it is possible to prevent the opposing tooth rack 2 from coming into contact with the lead screw 7a during normal use and applying an extra frictional load, and it is possible to realize good movement of the lens moving frame 5.

As described above, in the present embodiment, the work of assembling and integrating the main tooth rack 1, the opposing tooth rack 2 and the torsion coil spring 3 having the spring end portion 3a can be realized by the work in one direction. Further, the work of assembling the integrated main tooth rack 1 together with the torsion coil spring 3 to the lens moving frame 5 can be realized by the work in one direction.

The configuration of the present invention is not limited to that illustrated in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, etc. can be appropriately changed as long as the gist of the present invention is not deviated. Is.

1 Main tooth rack 1d Spring hook 2 Opposing tooth rack 2e Spring hook 3 Twist coil Spring 3d, 3e Coil 3a, 3b, 3c Spring end 4 Rack 5 Lens moving frame 5e Spring hook L Lens 7a Lead screw 8 Drive

Claims (8)

A holding member that holds the optical element and
A drive unit with a feed screw and
A rack that is rotatably supported by the holding member and engages with the feed screw to convert the rotation of the feed screw into axial movement of the holding member.
Two coil portions externally inserted into the rack are connected by a first spring end portion, and a torsion coil spring provided with a second spring end portion and a third spring end portion at both ends is provided.
The rack is arranged so as to face the first rack member with the feed screw engaged with the feed screw and the feed screw in the radial direction so as to be rotatable with respect to the first rack member. It also has a second rack member that is movably inserted in the axial direction and engages with the lead screw when the first rack member is displaced in a predetermined direction in a direction in which the lead screw is disengaged. ,
In the torsion coil spring, the first spring end portion is hooked on the first spring hooking portion provided on the first rack member, and the second spring end portion is provided on the second rack member. The third spring end is hooked on the third spring hook provided on the holding member.
The first spring end and the second spring end urge the second rack member in the direction of the feed screw with respect to the first rack member, and the first spring end and the third spring. The end urges the first rack member against the holding member in the direction of the feed screw.
A drive device characterized in that the first rack member and the second rack member are urged in a direction away from each other in the axial direction by at least one coil portion of the two coil portions. On at least one of the first rack member and the second rack member, the first rack member and the second rack member move in a direction separated by a predetermined interval or more due to an axial urging force of the coil portion. The driving device according to claim 1, wherein a first stopper is provided. The first stopper has an inclined portion that abuts on the first spring end portion and guides the first spring end portion to the first spring hooking portion at the time of assembly, and the inclined portion is in the axial direction of the rack. The drive device according to claim 2, wherein the drive device is provided so as to be inclined with respect to the vehicle. The holding member is provided with a pair of rack support portions having a pair of engaging holes for rotatably supporting a pair of mounting shafts coaxially provided on the first rack member and the second rack member, respectively. ,
When the rack is attached to the holding member, at least one of the pair of attachment shafts is brought into contact with the rack support portion to resist the axial urging force of the coil portion, and the first rack member and the first rack member. When the distance between the two rack members in the axial direction is made smaller than in use and the pair of mounting shafts are inserted into the pair of engaging holes, the first rack member and the first rack member and the first rack member and the first rack member and The drive device according to any one of claims 1 to 3, wherein the axial spacing of the second rack member is the spacing during use. The first rack member or the second rack member comes into contact with an abutting portion provided on the holding member during use, and the axial distance between the first rack member and the second rack member is a predetermined distance. The drive device according to any one of claims 1 to 4, wherein a second stopper for restricting approach to the above is provided. The driving device according to any one of claims 1 to 5, wherein the optical element is a lens, and the optical axis of the lens and the rotation axis of the rack are arranged in parallel. In the torsion coil spring, the urging force for urging the second rack member toward the feed screw is set to be larger than the urging force for urging the first rack member toward the feed screw, and the second rack member is set to be larger than the urging force for urging the first rack member toward the feed screw. Claims 1 to 6 are characterized in that the urging force for urging the rack member toward the feed screw is set to be smaller than the force for damaging at least one of the first rack member and the feed screw. The driving device according to any one of the above. An optical device including a drive device that drives a holding member that holds an optical element by using a rack and a feed screw.
An optical device comprising the drive device according to any one of claims 1 to 7 as the drive device.

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