JP2020181126A - Shaft position variable mechanism and lens drive device - Google Patents

Abstract

To provide a shaft position variable mechanism and a lens drive device in each of which a distance between shafts of two gears can be adjusted precisely as compared with a case in which shafts positions are linearly adjusted.SOLUTION: A shaft position variable mechanism 1 has: a support member 20 to which a first shaft 24 and a second shaft 26 eccentric with the first shaft 24 are connected; a base member 10 into which the second shaft 26 is rotatably inserted; a fixation member 40 which fixes the second shaft 26 to the base member 10; a first engagement portion which is provided on the side of the base member 10, of the support member 20; and a second engagement portion which is provided on the side of the support member, of the base member, and engages with the first engagement portion, each of the first engagement portion and second engagement portion comprises a rotation restriction portion which is engaged rotatably only in one rotating direction of the second shaft.SELECTED DRAWING: Figure 3

Description

The technique of the present disclosure relates to a shaft position variable mechanism and a lens driving device.

Patent Document 1 describes a means for adjusting the backlash between a first gear supported by a rotatable housing and a second gear that meshes with the first gear, and the housing can be rotated by a predetermined amount. The rotation center axis of the first gear is eccentrically arranged with respect to the rotation center axis of the housing, and the first gear is displaced in the direction of approaching and separating from the second gear under the rotational action of the housing. A backlash adjusting means for adjusting the position of the first gear with respect to the second gear is disclosed.

Patent Document 2 discloses a backlash removing mechanism in which a drive side gear and a driven side gear are meshed with each other via an intermediate gear. In this mechanism, the intermediate gear is supported by a pin shaft that is eccentric to the shaft of the intermediate gear so that its position can be adjusted, and the first adjustment bolt that presses the intermediate gear against the driven gear and the driving gear are used as the intermediate gear. A second adjusting bolt for pressing is provided.

Jitsukaisho 64-12959 Jitsukaisho 64-4948 Gazette

One embodiment according to the technique of the present disclosure is a shaft position variable mechanism and a lens driving device that can be adjusted more accurately than when the shaft position is linearly adjusted in order to adjust the distance between the axes of two gears. I will provide a.

In the first aspect according to the technique of the present disclosure, a support member in which a first shaft and a second shaft eccentric with respect to the first shaft are connected and a second shaft are rotatably inserted. A base member, a fixing member for fixing the second shaft to the base member, a first engaging portion provided on the base member side of the support member, and a first engaging portion provided on the support member side of the base member. It has a second engaging portion that engages with the engaging portion, and the first engaging portion and the second engaging portion rotatably engage only in one rotation direction of the second shaft. It is a shaft position variable mechanism including a regulating unit.

In the second aspect according to the technique of the present disclosure, the fixing member is a rotary fastening member, and the rotary fastening member fixes the support member to the base member by engaging with the outer peripheral surface of the second shaft. This is a shaft position variable mechanism according to the above embodiment.

A third aspect of the technique of the present disclosure is that the base member is provided with at least one first convex portion as a second engaging portion, and the second convex portion is provided at a position corresponding to the first convex portion of the support member. This is a shaft position variable mechanism according to a second aspect, in which a plurality of first recesses are provided as first engaging portions on concentric circles of the shaft.

In a fourth aspect according to the technique of the present disclosure, the first recess has a first inclined surface whose depth gradually becomes shallower toward the first direction in which the rotary fastening member is tightened, and a second direction opposite to the first direction. This is a position variable mechanism according to a third aspect, which has a first inner wall portion at an end portion of the above.

A fifth aspect of the technique of the present disclosure is that when the support member is rotated in the first direction, the first convex portion and the first inner wall portion of the first concave portion are non-rotatably engaged with each other to form the support member. This is an axial position variable mechanism according to a fourth aspect, wherein the rotation is restricted and the support member rotates when the first inclined surface gets over the first convex portion when the support member is rotated in the second direction.

In a sixth aspect according to the technique of the present disclosure, the base member has a recess, and the first convex portion can be pushed into the recess and protrudes outward from the recess via an elastic member. The shaft position variable mechanism according to any one of the third to fifth aspects, which is attached to the recess.

In a seventh aspect according to the technique of the present disclosure, the base member has a first contact surface that comes into contact with the support member, and the base member is provided with at least one second convex portion as a second engaging portion. , A shaft position variable mechanism according to a second aspect, wherein a plurality of second recesses are provided as first engaging portions on concentric circles of the second shaft at positions corresponding to the second convex portion of the support member. ..

An eighth aspect according to the technique of the present disclosure is that the second convex portion has a second inclined surface and a second inclined surface, in which the second convex portion gradually becomes higher than the first contact surface in the second direction in which the rotary fastening member is loosened. It is an axial position variable mechanism according to a seventh aspect, which has a first outer wall portion formed from an end portion in the second direction toward a first contact surface.

In the ninth aspect according to the technique of the present disclosure, when the support member is rotated in the first direction opposite to the second direction, the first outer wall portion and the second inner wall portion of the second recess become non-rotatable. The shaft position variable mechanism according to the eighth aspect, wherein the rotation of the support member is restricted by engaging with the support member, and when the support member is rotated in the second direction, the support member rotates by overcoming the second inclined surface. ..

In a tenth aspect according to the technique of the present disclosure, the base member has a recess, and the second convex portion can be pushed into the recess and protrudes outward from the recess via an elastic member. The shaft position variable mechanism according to any one of the seventh to ninth aspects attached to the recess.

In the eleventh aspect of the technique of the present disclosure, the support member has a second contact surface that comes into contact with the base member, and a third as a second engaging portion on a concentric circle of the second axis of the base member. This is a shaft position variable mechanism according to a second aspect, wherein a plurality of concave portions are provided, and at least one third convex portion is provided as a first engaging portion at a position corresponding to the third concave portion of the support member.

A twelfth aspect according to the technique of the present disclosure is that the third convex portion has a third inclined surface and a third inclined surface in which the third convex portion gradually becomes higher than the second contact surface in the first direction for tightening the rotary fastening member. It is an axial position variable mechanism according to an eleventh aspect having a second outer wall portion formed from an end portion in the first direction toward a second contact surface.

In the thirteenth aspect according to the technique of the present disclosure, when the support member is rotated in the first direction, the support member is engaged with the second outer wall portion and the third inner wall portion of the third recess so as not to rotate. When the support member is rotated in the second direction opposite to the first direction, the support member rotates as the third inclined surface gets over between the plurality of third recesses. This is a shaft position variable mechanism according to the above embodiment.

A fourteenth aspect according to the technique of the present disclosure is a shaft position variable mechanism according to any one of the first to thirteenth aspects, wherein the first shaft is a gear shaft that rotatably supports the gear. Is.

A fifteenth aspect according to the technique of the present disclosure is a first aspect connected to a shaft position variable mechanism according to any one of the first to fourteenth aspects and a support member included in the shaft position variable mechanism. It is a lens driving device including a power transmission mechanism for transmitting power obtained by rotating the shaft or the second shaft by receiving the power of a motor to the lens.

It is a side view of the shaft position variable mechanism which concerns on 1st Embodiment. It is an exploded view seen from the side surface of the shaft position variable mechanism which concerns on 1st Embodiment. It is a top view of the shaft position variable mechanism which concerns on 1st Embodiment. It is a perspective view which fits the support member which concerns on 1st Embodiment into a base member. It is a perspective view which looked at the support member which concerns on 1st Embodiment from the side which faces the base member. It is a perspective view which shows the positional relationship between the 1st convex part and the 1st concave part when the support member which concerns on 1st Embodiment is fitted into a base member. It is a partial cross-sectional view of the main body and the base member of the support member in the state where the 1st convex part and the 1st concave part are engaged, and is an example of the aspect in which the 1st convex part and the 1st concave part are rotatably engaged. It is a partial cross-sectional view which shows. FIG. 7A is a partial cross-sectional view of the main body of the support member and the base member when the support member is rotated in the second direction from the state shown in FIG. 7A, and the first inclined surface of the first concave portion rides on the first convex portion. It is a partial cross-sectional view which shows an example of the said aspect. It is a top view before adjusting the distance between the axes of two gears. It is a top view after adjusting the distance between the axes of two gears. FIG. 5 is a partial cross-sectional view in which a first convex portion and a first concave portion according to a second embodiment are non-rotatably engaged with each other. It is a partial cross-sectional view in the middle of rotating the support member which concerns on 2nd Embodiment in the direction which rotation is not restricted. FIG. 5 is a partial cross-sectional view in which the first convex portion and the first concave portion according to the second embodiment are not engaged with each other. It is a perspective view of the 1st convex part which concerns on 3rd Embodiment. FIG. 10A is a cross-sectional view taken along the line BB of FIG. 10A. FIG. 5 is a cross-sectional view in which a first convex portion and a first concave portion according to a third embodiment are non-rotatably engaged with each other. It is a perspective view of the 2nd convex part and the 2nd concave part which concerns on 4th Embodiment. It is a perspective view which looked at the 3rd convex part and 3rd concave part which concerns on 5th Embodiment from different directions. This is an example of the configuration of a lens driving device using the shaft position variable mechanism according to the embodiment according to the technique of the present disclosure. It is a perspective view in the case of adjusting the shaft position linearly and fixing with a screw. It is sectional drawing which shows the modification of the 1st convex part and the 1st concave part which concerns on the technique of this disclosure. It is sectional drawing which shows the other modification of the 1st convex part and the 1st concave part which concerns on this disclosure technique.

(First Embodiment of the Technology of the Present Disclosure)
Hereinafter, an example of the embodiment according to the technique of the present disclosure will be described with reference to the drawings. When the concept of the up / down / left / right direction is used in the description of the member or the configuration in the drawing, it simply means the up / down / left / right direction in the drawing and does not mean the absolute direction unless otherwise specified.

As shown in FIG. 1 as an example, the shaft position variable mechanism 1 includes a base member 10, a support member 20, and a nut 40. The support member 20 is fixed to the base member 10 by being fastened to the base member 10 by a nut 40.

The support member 20 includes a first shaft 24 and a gear 2. A gear 2 is rotatably attached to the first shaft 24. That is, the first shaft 24 is a gear shaft that rotatably supports the gear 2.

A motor 6 is fixed to the base member 10, and a gear 4 is attached to a drive shaft of the motor 6. The gear 2 and the gear 4 are meshed with each other, and the power generated by the motor 6 is transmitted to the gear 4 via the drive shaft to rotate the gear 4. The rotational force of the gear 4 is transmitted to the gear 2. The gear 2 rotates by receiving the rotational force of the gear 4. The nut 40 is an example of a "fixing member" and a "rotary fastening member" in the technique of the present disclosure.

As an example, as shown in FIG. 2, the support member 20 has a main body 22, a first shaft 24, and a second shaft 26. In other words, the support member 20 is connected to the first shaft 24 and the second shaft 26. The first shaft 24 is located closer to the gear 2 than the main body 22, and the second shaft 26 is located closer to the base member 10 of the main body 22. The second shaft 26 is formed so as to project downward from the fitting portion 28 provided on the side of the base member 10. A male screw 29 is cut on the outer circumference of the second shaft 26.

As an example, as shown in FIGS. 2 and 3, the first axis AX1 which is the central axis of the first axis 24 is eccentric with respect to the second axis AX2 which is the central axis of the second axis 26. .. That is, the second axis AX2 and the first axis AX1 are parallel, but not on the same straight line. The fitting portion 28 is formed in a columnar shape, and the axial center of the fitting portion 28 coincides with the second axial center AX2. The meaning of "parallel" in the present specification is not only the meaning of parallel (perfect parallel) in a strict sense, but also designed so that the gear 4 functions to transmit power to the gear 2. It also includes the meaning of parallel (substantially parallel) with acceptable errors in top and manufacturing.

As an example, as shown in FIG. 2, the base member 10 is provided with an insertion hole 14 having an inner diameter equivalent to the outer diameter of the fitting portion 28, and the second shaft 26 is inserted into the insertion hole 14. The insertion hole 14 and the fitting portion 28 are formed so that the base member 10 and the fitting portion 28 have an in-row structure. That is, the fitting portion 28 is fitted into the insertion hole 14 in a state where it can rotate so as not to cause rattling in the insertion hole 14.

The fitting portion 28 has a length similar to the thickness of the base member 10. When the fitting portion 28 is fitted into the insertion hole 14 of the base member 10, the male screw 29 of the second shaft 26 is exposed on the side opposite to the side where the main body 22 of the base member 10 is located. By tightening the nut 40 on the male screw 29, the support member 20 is fixed to the base member 10.

In the first embodiment according to the technique of the present disclosure, the first shaft 24 and the second shaft 26 are formed of a material such as metal or hard resin integrally with the main body 22. The material of the support member 20 is not limited to these, and may be any material having the strength necessary for transmitting power by the gears. Similarly, the material of the base member 10 may be any material having strength capable of supporting the support member 20 that supports the gear 2 and the motor 6.

The first shaft 24 and the second shaft 26 are integrally formed with the main body 22, and the gear 2 is attached to the first shaft 24. The first shaft 24 and / or the second shaft 26 may be manufactured separately from the main body 22, and the manufactured first shaft 24 and / or the second shaft 26 may be attached to the main body 22. In this case, the first gear 2 may be attached to the main body 22 with the gear 2 attached to the first shaft 24, or the gear 2 may be attached to the main body 22 after the first shaft 24 is attached to the main body 22. It may be attached to the shaft 24. In the present specification, in the sense that the first shaft 24 and the second shaft 26 are connected to the support member 20, the first shaft 24 and / or the second shaft 26 is integrated with the main body 22. In addition to the meaning of being formed, it also includes the meaning that the first shaft 24 and / or the second shaft 26 is retrofitted to the main body 22.

In the example shown in FIG. 3, the first direction P and the second direction Q are shown. The first direction P is a direction corresponding to the rotation direction of the nut 40 with respect to the second shaft 26 when the nut 40 is tightened with respect to the second shaft 26. The second direction Q is a direction corresponding to the rotation direction of the nut 40 with respect to the second shaft 26 when the nut 40 is removed from the second shaft 26. The second direction Q is an example of the "one rotation direction" according to the technique of the present disclosure.

When the support member 20 is rotated in the second direction Q about the second axis AX2, the first axis AX1 and the second axis AX2 are eccentric, so that the support member 20 is centered on the second axis AX2. The uniaxial center AX1 rotates along the second direction Q, and the first shaft 24 approaches the gear 4. The fact that the first shaft 24 approaches the gear 4 means that the gear 2 approaches the gear 4.

On the other hand, when the support member 20 is rotated in the direction of the first direction P about the second axis AX2, the first axis AX1 and the second axis AX2 are eccentric, so that the second axis AX2 is moved. The first axis AX1 rotates along the first direction P around the center, and the first shaft 24 moves away from the gear 4. The fact that the first shaft 24 moves away from the gear 4 means that the gear 2 moves away from the gear 4. In this way, by rotating the support member 20 in the first direction P or in the second direction Q, the positional relationship between the position of the gear 2 and the gear 4 is adjusted.

The configuration shown in FIG. 3 is such that if the support member 20 is continuously rotated in the second direction Q, the gear 2 abuts on the gear 4 and cannot rotate any more. However, when the support member 20 is continuously rotated in the second direction Q about the second axis AX2, the gear 2 is configured to be separated from the gear 4 after the gear 2 meshes with the gear 4. May be good. For this purpose, even when the gear 2 and the gear 4 are closest to each other, the positions of the first axis AX1 and the second axis AX2 so as to have a distance between the axes so that the gear 2 and the gear 4 can mesh with each other and rotate. Should be set.

By the way, as shown in FIG. 4 as an example, the base member 10 and the main body 22 are provided with a rotation restricting portion 25. The rotation restricting portion 25 restricts the support member 20 from rotating in the first direction P as the nut 40 is tightened to the male screw 29 in a state where the fitting portion 28 is fitted into the insertion hole 14.

The rotation regulation unit 25 will be described in detail below. As an example, as shown in FIG. 4, the rotation restricting portion 25 has a first convex portion 16 and a plurality of first concave portions 32. The plurality of first recesses 32 are provided on the base member 10 side of the main body 22 of the support member 20. The plurality of first recesses 32 are spaced apart from the second shaft 26 along the radial direction of the second shaft 26 by a predetermined distance (for example, a constant distance) on the concentric circles of the second shaft 26. It is arranged in. The first convex portion 16 is provided on the support member 20 side of the base member 10. The first convex portion 16 is an example of the "second engaging portion" according to the technique of the present disclosure, and the plurality of first concave portions 32 are the "first engaging portion" according to the technique of the present disclosure. This is an example.

The base member 10 has a base member side contact surface 12. The base member side contact surface is an example of the "first contact surface" according to the technique of the present disclosure. The base member side contact surface 12 is a flat surface that contacts the main body 22 in the direction of the second axis AX2. The first convex portion 16 is provided at a position corresponding to the first concave portion 32 in the base member side contact surface 12. The first convex portion 16 is formed in a cylindrical shape protruding from the base member side contact surface 12 toward the main body 22 along the direction of the second axis AX2. The shape of the first convex portion 16 is not limited. It suffices to have a portion that engages with the first inner wall portion 36 of the first recess 32 described below.

As an example, as shown in FIG. 5, a support member side contact surface 30 is formed on the side of the main body 22 facing the base member 10. The support member side contact surface is an example of the "second contact surface" according to the technique of the present disclosure. The support member side contact surface 30 is a flat surface that contacts the base member side contact surface 12 in the direction of the second axis AX2. On the support member side contact surface 30, a plurality of first recesses 32 are defined on concentric circles of the second shaft 26 at positions separated from the second shaft 26 along the radial direction of the second shaft 26. It is formed at intervals of. Each of the plurality of first recesses 32 has a first inclined surface 34 and a first inner wall portion 36. The first inclined surface 34 and the first inner wall portion 36 are formed at positions facing each other around the second axial center AX2 in the inner wall surface of the first recess 32. That is, the first inclined surface 34 and the first inner wall portion 36 are both end faces (hereinafter, simply referred to as "both end faces") facing each other around the second axis AX2 in the inner wall surface of the first recess 32. is there.

The first inclined surface 34 is an end surface of the first direction P of both end faces (hereinafter, referred to as "first direction end surface"), and the first inner wall portion 36 is of the second direction Q of both end faces. It is an end face (hereinafter, referred to as "second direction end face"). When the concave direction of the first concave portion 32 from the support member side contact surface 30 is the depth direction of the first concave portion 32, the end surface in the first direction is a flat surface inclined downward toward the depth direction. The end face in the second direction stands up from the bottom surface of the inner wall surface of the first recess 32 along the second axis AX2, and is a plane parallel to the second axis AX2.

That is, the first inclined surface 34 is a flat surface whose depth from the support member side contact surface 30 gradually becomes shallower toward the first direction P, and the first inner wall portion 36 is the inner wall surface of the first recess 32. It is a plane formed at the end of the second direction Q opposite to the first direction P. The first inner wall portion 36 is a plane parallel to the second axis AX2, and is formed at a position facing the first inclined surface 34 on a concentric circle of the second axis 26.

On the other hand, as shown in FIG. 4, as an example, one first convex portion 16 is provided on the base member side contact surface 12 with which the main body 22 of the support member 20 contacts. The first convex portion 16 is provided at a position corresponding to the first concave portion 32, away from the insertion hole 14. The first convex portion 16 has a size that is entirely received by the first concave portion 32.

As an example, as shown in FIG. 4, when the second shaft 26 is inserted into the insertion hole 14 with the position of the first convex portion 16 and the position of the first concave portion 32 facing each other, the support member side contact The surface 30 comes into contact with the base member side contact surface 12. Then, as shown in FIG. 6, as an example, the first convex portion 16 is received by the first concave portion 32. When the support member 20 is to be rotated in the first direction P while the first convex portion 16 is received by the first concave portion 32, the first inner wall portion 36 and the first convex portion 16 of the first concave portion 32 become Engage non-rotatably, thereby restricting the rotation of the support member 20.

Here, the engagement between the first concave portion 32 and the first convex portion 16 will be described with reference to FIGS. 7A and 7B. FIG. 7A is a plan view of a state in which the first convex portion 16 and the first concave portion 32 are engaged with each other. As an example, as shown in FIG. 7A, only when the support member 20 is rotated in the first direction P about the second shaft 26, is the end portion of the first convex portion 16 on the second direction Q side. (Hereinafter, also referred to as "second direction end portion") and the first inner wall portion 36 are non-rotatably engaged. That is, when a rotational force in the first direction P is applied to the second shaft 26, the first inner wall portion 36 abuts on the second direction end portion, and the second direction end portion is the first inner wall portion 36. Is blocked from moving in the first direction P. That is, the rotation of the support member 20 in the first direction P is restricted by the contact of the end portion in the second direction with the first inner wall portion 36.

On the other hand, when the support member 20 is rotated in the second direction Q about the second shaft 26, as shown in FIG. 7B as an example, the first inclined surface 34 of the first recess 32 abuts on the support member side. Since the inclined surface is shallow toward the P side in the first direction and deep toward the Q side in the second direction with respect to the surface 30, the first inclined surface 34 gets over the first convex portion 16. The support member 20 rotates when the first inclined surface 34 gets over the first convex portion 16. That is, when the first inclined surface 34 gets over the first convex portion 16, the second shaft 26 rotates around the second axis AX2, and accordingly, the first shaft 24 becomes the second shaft 26. Rotates along the circumferential direction of.

As described above, the support member 20 is restricted from rotating by the non-rotatable engagement of the first convex portion 16 and the first concave portion 32 with respect to the first direction P, and with respect to the second direction Q. Is rotated by rotatably engaging the first convex portion 16 and the first concave portion 32.

Next, a method of adjusting the position of the gear 2 with respect to the gear 4 will be described. As an example, as shown in FIG. 8A, the support member 20 having the gear 2 attached to the first shaft 24 is fitted into the base member 10 so that the gear 2 is located away from the gear 4. Next, the support member 20 is rotated in the second direction Q about the second shaft 26. By rotating the support member 20 in the second direction Q, the gear 2 having the first axis AX1 of the first shaft 24 eccentric from the second axis AX2 of the second axis 26 as the rotation axis is a gear. Approach the direction of 4.

The method of rotating the second shaft 26 is not limited. For example, a groove for attaching the rotating jig may be provided at the tip of the second shaft 26. Further, a rotating jig that holds and rotates the support member 20 may be used.

As shown in FIG. 8B, the nut 40 is fastened after the rotation is adjusted to a position where the meshing of the gear 2 and the gear 4 becomes appropriate. The direction in which the nut 40 is tightened is the first direction P. If there is no rotation restricting portion 25, the support member 20 will rotate around the second shaft 26 in the first direction P when the nut 40 is fastened. However, the rotation regulating portion 25 composed of the first convex portion 16 and the first concave portion 32 regulates the rotation of the support member 20 in the first direction P. Therefore, the support member 20 is fixed to the base member 10 while maintaining an appropriate position in meshing between the gear 2 and the gear 4, and cannot rotate in either direction thereafter.

The effect of the shaft position variable mechanism 1 having the above configuration will be described. The motor 6 and the support member 20 are attached to the base member 10 at predetermined positions. The base member 10 is designed so that the gear 2 attached to the support member 20 and the gear 4 attached to the motor 6 mesh with each other at the most appropriate distance. However, the gear 2 and the gear 4 may not be properly meshed due to a manufacturing error of the base member, a manufacturing error of the gear 2 and the gear 4, and / or an error of assembling the motor 6 and the support member 20 to the base member 10. is there.

However, by using the shaft position variable mechanism 1 according to the first embodiment, the position of the gear 2 can be adjusted for each product so as to properly mesh with the gear 4. Specifically, by rotating the support member 20 toward the Q side in the second direction to adjust the position of the first shaft 24, which is the rotation shaft of the gear 2, the shaft of the gear 2 and the shaft of the gear 4 are aligned. The distance can be adjusted. Then, after the distance between the shafts is adjusted, the support member 20 is fastened to the base member 10 with the nut 40, so that the shaft position can be adjusted without the misalignment of the gear 2.

When the support member 20 is rotated in the second direction Q side for adjusting the distance between the shafts, the gear 2 may be rotated too close to the gear 4. In this case, the support member 20 is lifted away from the base member 10 to release the non-rotatable engagement between the first convex portion 16 and the first concave portion 32 of the rotation restricting portion 25, and the support member 20 is moved in the first direction. After rotating to P to increase the inter-axis distance, the inter-axis distance can be adjusted again. Alternatively, if the support member 20 can be continuously rotated in the second direction Q side, the support member 20 can be rotated once and the distance between the axes can be adjusted again.

The shaft position variable mechanism 1 according to the first embodiment uses a configuration in which the second shaft 26 is rotated in order to adjust the position of the gear 2. The configuration in which the position of the gear is rotationally moved for positioning can be positioned with higher accuracy than the configuration in which the position of the gear is linearly moved for positioning.

Specifically, as shown in FIG. 14, as an example, a configuration is assumed in which the position of the gear is linearly moved for positioning. In the configuration shown in FIG. 14, even when a movement restricting portion that can move in the direction G and cannot move in the direction N is provided, when the nut 40A is rotated in the rotation direction R to fasten and fix the support member, it rotates. Since the component of the direction G is included in the direction R, the support member may move in the direction G at the time of fastening. Therefore, the adjustment position may shift. Even if the rotation direction of the nut 40A is reversed, the adjustment position may shift at the time of fastening because the component of the direction G is still contained.

On the other hand, the shaft position variable mechanism 1 according to the first embodiment can rotate the support member 20 only in one rotation direction by providing the rotation restricting unit 25. The direction in which the nut 40 can be rotated is the second direction Q opposite to the first direction P for tightening the nut 40. When fastening the nut 40, a force is applied to the first direction P, but no force is applied to the second direction Q where the support member 20 can rotate. Therefore, the support member 20 is used as the base member 10 while maintaining the positioned position. Can be fixed with a nut 40. Therefore, after positioning, the position of the support member 20 does not shift when the support member 20 is fixed, and the gear shaft can be positioned with high accuracy.

Since the distance between the shafts can be adjusted for each product by using the shaft position variable mechanism 1 according to the first embodiment, the manufacturing error and the assembly error of the gear 2, the gear 4, and / or the base member 10 are taken into consideration. There is no need. Therefore, for example, the permissible values of these manufacturing errors and assembly errors can be increased, and the manufacturing cost can be reduced. In addition, since the individual products can be adjusted so that the meshing is appropriate, the yield of the products can be improved.

In the first embodiment, the fixing member 40 is a nut 40 which is a rotary fastening member, and the nut 40 engages with a male screw 29 on the outer peripheral surface of the second shaft 26 to fix the support member 20 to the base member 10. To do. In the embodiment according to the technique of the present disclosure, since the nut 40, which is easy to handle, is used for screw tightening and fixing, the fixing is easy.

In the first embodiment, the base member 10 is provided with at least one first convex portion 16 as a second engaging portion, and the second shaft 26 is provided at a position corresponding to the first convex portion 16 of the support member 20. A plurality of first recesses 32 are provided as first engaging portions on the concentric circles of the above, and the first recesses 32 have a first inclined surface 34 whose depth gradually becomes shallower toward the first direction P for tightening the rotary fastening member 40. The first inner wall portion 36 is provided at the end of the second direction Q opposite to the first direction P. With this configuration, when the nut 40 is tightened, the first convex portion 16 and the first inner wall portion 36 of the first concave portion 32 are non-rotatably engaged, and the co-rotation of the support member 20 when the nut 40 is tightened is restricted. Since the rotation regulating function is fulfilled, the adjustment position of the first shaft 24 does not shift.

In the first embodiment, when the support member 20 is rotated in the first direction P, the first convex portion 16 and the first inner wall portion 36 of the first concave portion 32 are non-rotatably engaged with each other to cause the support member 20 to rotate. The rotation is restricted, and when the support member 20 is rotated in the second direction Q, the support member 20 rotates when the first inclined surface 34 gets over the first convex portion 16. With this configuration, the support member 20 rotates when determining the position of the first shaft 24, but the support member 20 does not rotate when the nut 40 is tightened, so that the positioning of the first shaft 24 can be achieved with high accuracy. ..

In the first embodiment, the first inner wall portion 36 of the first recess 32 is formed parallel to the second axis AX2, that is, perpendicular to the second contact surface 30. However, the shape or properties of the first inner wall portion 36 are not limited to this. The shape or property of the inner wall of the first inner wall portion 36 may be any shape or property that engages with the first convex portion 16 to regulate the rotation when the support member 20 is rotated in the first direction P. For example, as shown in FIG. 15A as an example, the first inner wall portion 36A may be formed diagonally so as to gradually become deeper from the second contact surface 30 as a whole. Then, a plurality of small protrusions 36B may be provided on the surface of the first inner wall portion 36A so as to engage with the corner portion 16A of the first convex portion 16 to regulate the rotation. Further, the surface of the first inner wall portion 36A may be roughened to increase the friction coefficient to regulate the rotation.

Further, as shown in FIG. 15B as an example, the first inner wall portion 36A is formed obliquely with respect to the second contact surface 30, and the surface 16B on the side of the first convex portion 16 in contact with the first inner wall portion 36A is formed. It may be formed diagonally according to the shape of the first inner wall portion 36A. By roughening the surfaces of the first inner wall portion 36A and the surface 16B, respectively, the friction coefficient between the first inner wall portion 36A and the surface 16B can be increased and the surfaces 16B can be engaged so as to regulate the rotation. Further, the shape of the first convex portion 16 on the side not in contact with the first inner wall portion 36A is not limited to the shape shown in FIG. 15A or FIG. 15B. When the support member 20 is rotated in the second direction Q, the first inclined surface 34 of the first concave portion 32 may have a slope shape, for example, so as to get over the first convex portion 16. As described above, the combination of the shape and properties of the first convex portion 16 and the shape and properties of the first concave portion 32 can be appropriately selected.

(Second Embodiment of the Technology of the Present Disclosure)
Next, the second embodiment will be described with reference to the drawings. In the following embodiments, the same elements as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. As an example, as shown in FIG. 9A, the shaft position variable mechanism 101 includes a base member 10A, a support member 20, and a nut 40. The support member 20 has the same structure as the support member 20 (see FIG. 4) described in the first embodiment. The nut 40 is also the same as that of the first embodiment. The base member 10A has a first convex portion 16A different from the first convex portion 16 of the first embodiment. The first convex portion 16A has a size that is partially received by the first concave portion 32 provided in the support member 20.

The first convex portion 16A is supported by the base member 10A so as to project from the inside to the outside of the recess 17 provided in the base member 10A. Specifically, the first convex portion 16A is supported by the base member 10A so as to project outward from the base member side contact surface 12 by a spring 18 arranged on the bottom surface of the recess 17. The spring 18 is, for example, a string-wound spring. The spring 18 is an example of an "elastic member" in the technique of the present disclosure. The "outside" in the second embodiment and the third embodiment described later means the outside of the recess 17 with respect to the inside, and the "protruding outward" means the contact surface 12 on the base member side from the recess 17. It is to project outward from the surface. In addition, in FIG. 9A, it means that it protrudes upward in the figure from the contact surface 12 on the base member side.

Next, the function of the shaft position variable mechanism 101 will be described. When the fitting portion 28 of the support member 20 is fitted into the insertion hole 14 of the base member 10A at the rotational position where the recess 17 and the first concave portion 32 face each other, as shown in FIG. 9A, the first convex portion 16A becomes Due to the repulsive force of the spring 18, the recess 17 projects from the inside of the first recess 32, which is outside the contact surface 12 on the base member side.

The length of the first convex portion 16A in the protruding direction is larger than the internal depth of the first concave portion 32. Therefore, as shown in FIG. 9A, even when the first convex portion 16A protrudes inside the first concave portion 32, the lower portion of the first convex portion 16A remains inside the recess 17. Therefore, even if the support member 20 is to be rotated in the first direction P in the state shown in FIG. 9A, the first convex portion 16A and the first inner wall portion 36 are non-rotatably engaged with each other, so that the rotation is restricted. .. The first convex portion 16A and the first concave portion 32 are examples of the "rotation regulating portion" according to the technique of the present disclosure.

As an example, as shown in FIG. 9B, when the support member 20 is rotated in the second direction Q from the state shown in FIG. 9A, the first convex portion 16A is pushed downward by the first inclined surface 34 of the first concave portion 32. It sinks inside the recess 17.

Subsequently, as shown in FIG. 9C as an example, when the support member 20 further rotates in the second direction Q, the first concave portion 32 is completely separated from the position facing the first convex portion 16A, and the first convex portion 16A becomes the first convex portion 16A. The whole is pushed below the base member side contact surface 12 by the support member side contact surface 30 of the support member 20. As described above, the support member 20 is rotatable in the second direction Q.

According to the shaft position variable mechanism 101 according to the second embodiment, the same effect as that of the first embodiment can be obtained. Further, the first convex portion 16A can be pushed inward from the base member side contact surface 12 with the support member 20 of the base member 10A and can be projected outward from the base member side contact surface 12, and the elastic member 18 can be formed. It is supported by the base member 10A via. With this configuration, the support member side contact surface 30 of the support member 20 rotates while pushing the first convex portion 16A. Therefore, when the support member 20 is rotated in the second direction Q, as in the first embodiment, The effect that the support member 20 does not float (see FIG. 7B) can be obtained.

(Third Embodiment of the technique of the present disclosure)
Next, the third embodiment will be described with reference to the drawings. As shown in FIG. 10A as an example, the base member 10B according to the third embodiment has a first convex portion 16B supported by the elastically deformed portion 19. The first convex portion 16B has a size that is partially received by the first concave portion 32 provided in the support member 20. The support member 20 used in the third embodiment has the same structure as the support member 20 (see FIG. 4) of the first embodiment. The elastically deformed portion 19 is provided so as to extend from the inner wall 117 on the second direction Q side of the recess 17A provided in the base member 10B in the direction along the base member side contact surface 12 of the base member 10B. There is. The elastically deformed portion 19 may be formed of the same material as the base member 10B, or may be formed of a material different from that of the base member 10B. The material is not limited as long as it has elasticity with predetermined dimensions and has the required mechanical strength. The elastically deformed portion 19 is an example of an "elastic member" in the technique of the present disclosure.

As an example, as shown in FIG. 10B, the first convex portion 16B is attached to the end portion of the elastically deformed portion 19. The elastically deformable portion 19 can be elastically deformed in the direction of the arrow Y in FIG. 10B, that is, in the vertical direction in FIG. 10B. When the first convex portion 16B supported by the elastically deformed portion 19 is pushed in, the entire portion is displaced to the inside of the recess 17A, that is, until it sinks inward of the base member side contact surface 12. Further, when no external force is applied to the first convex portion 16B, the upper portion thereof projects outward from the base member side contact surface 12.

Next, the functions of the support member 20 and the base member 10B according to the third embodiment will be described. As an example, as shown in FIG. 10C, when the fitting portion 28 of the support member 20 is fitted into the insertion hole 14 of the base member 10B at the rotation position where the first convex portion 16B and the first concave portion 32 face each other, the first convex portion 16B is fitted. The upper portion of the portion 16B is received by the first recess 32. In this state, if the support member 20 is to be rotated in the first direction P, the first convex portion 16B and the first inner wall portion 36 of the first concave portion 32 are non-rotatably engaged with each other. Rotation in one direction P is restricted. On the other hand, when the support member 20 is rotated in the second direction Q, the first inclined surface 34 of the first concave portion 32 makes the first convex portion 16B similar to the principle described in the second embodiment (see FIG. 9B). The support member 20 rotates because it is pushed forward. The first convex portion 16B and the first concave portion 32 are examples of the "rotation regulating portion" according to the technique of the present disclosure.

According to the above-mentioned third embodiment, in addition to the effect of the first embodiment, when the support member 20 is rotated in the second direction Q, the first inclined surface 34 of the first concave portion 32 becomes the first convex portion. Since the 16B is rotated while being pushed into the recess 17A, the same effect as that of the second embodiment that the support member 20 does not rise can be obtained.

(Fourth Embodiment of the Technology of the Present Disclosure)
Next, the shaft position variable mechanism 102 according to the fourth embodiment will be described with reference to the drawings. As an example, as shown in FIG. 11, the shaft position variable mechanism 102 includes a base member 10C, a support member 20A, and a nut 40. Since the nut 40 is the same as the nut 40 described in the first embodiment, the illustration is omitted.

The base member 10C includes a second convex portion 52. The second convex portion 52 has a second inclined surface 54 that gradually becomes higher than the base member side contact surface 12 of the base member 10C toward the second direction Q, and an end portion of the second inclined surface 54 in the second direction Q. It has a first outer wall portion 56 formed from the surface toward the base member side contact surface 12. The second convex portion 52 is an example of the “second engaging portion” in the technique of the present disclosure.

On the other hand, the support member 20A is provided with a plurality of second concave portions 62 at positions corresponding to the second convex portions 52 on the support member side contact surface 30. The plurality of second recesses 62 are provided on concentric circles of the second shaft 26. The second concave portion 62 has a size for receiving the second convex portion 52. The second recess 62 has a second inner wall portion 64 at the end on the Q side in the second direction. The second inner wall portion 64 is a surface that engages with the first outer wall portion 56 of the second convex portion 52. The second recess 62 does not need to have the first inclined surface 34, unlike the first to third embodiments. In the fourth embodiment, the second recess 62 is a rectangular parallelepiped recess having no inclined surface. The second recess 62 is an example of a "first engaging portion" in the technique of the present disclosure.

The function of the shaft position variable mechanism 102 having the above configuration will be described. When the support member 20A is to be rotated in the first direction P while the second convex portion 52 is received by the second concave portion 62, the first outer wall portion 56 and the second inner wall portion 64 of the second concave portion 62 Is non-rotatably engaged and the rotation of the support member 20A is restricted. On the other hand, when the support member 20A is rotated on the second direction Q side, the support member side contact surface 30 of the support member 20A gets over the second inclined surface 54 and rotates. The second convex portion 52 and the second concave portion 62 are examples of the “rotation regulating portion” according to the technique of the present disclosure.

The base member 10C of the shaft position variable mechanism 102 has a base member side contact surface 12 that comes into contact with the support member 20A. Further, the base member 10C is provided with at least one second convex portion 52 as a second engaging portion, and is a concentric circle of the second shaft 26 at a position corresponding to the second convex portion 52 of the support member 20A. A plurality of second recesses 62 are provided above as the first engaging portion. The second convex portion 52 has a second inclined surface 54 that gradually becomes higher than the base member side contact surface 12 toward the second direction Q that loosens the nut 40, and an end portion of the second inclined surface 54 in the second direction Q. It has a first outer wall portion 56 formed from the surface toward the base member side contact surface 12.

With the above configuration, the same effect as that of the first embodiment can be obtained. That is, when the nut 40 is tightened, the second convex portion 52 and the second inner wall portion 64 of the second concave portion 62 are non-rotatably engaged with each other, thereby suppressing the co-rotation of the support member 20A when the nut 40 is tightened. Since it fulfills the function, the adjustment position of the first shaft 24 does not shift.

According to the shaft position variable mechanism 102, when the support member 20A is rotated in the first direction P opposite to the second direction Q, the first outer wall portion 56 and the second inner wall portion 64 of the second recess 62 are formed. The rotation of the support member 20A is restricted by engaging in a non-rotatable manner, and when the support member 20A is rotated in the second direction Q, the support member 20A gets over the second inclined surface 54 and the support member 20A rotates. .. With this configuration, the support member 20A rotates when determining the position of the first shaft 24, but the support member 20A does not rotate when the nut 40 is tightened, so that the positioning and fixing of the first shaft 24 can be performed accurately. Can be achieved.

The second convex portion 52 may be supported by an elastic member as described with reference to FIGS. 9 and 10 in the second embodiment and the third embodiment. That is, the second convex portion 52 is an elastic member so that it can be pushed inward from the base member side contact surface 12 that comes into contact with the support member 20A of the base member 10C and can protrude outward from the base member side contact surface 12. It may be supported by the base member 10B via. According to this configuration, since the support member 20A rotates while pushing the second convex portion 52, the support member 20A does not float.

Further, the shapes or properties of the second convex portion 52 and the second concave portion 62 are not limited to the shapes and properties described in the fourth embodiment. For example, the shape of the second inner wall portion 64 of the second recess 62 can be formed as described with reference to FIG. 15A. Further, the shapes or properties of the second convex portion 52 and the second concave portion 62 can be configured as described with reference to FIG. 15B. As described above, the combination of the shape and properties of the second convex portion 52 and the shape and properties of the second concave portion 62 can be appropriately selected.

(Fifth Embodiment of the Technology of the Present Disclosure)
Next, the shaft position variable mechanism 103 according to the fifth embodiment will be described with reference to the drawings. As an example, as shown in FIG. 12, the shaft position variable mechanism 103 includes a base member 10D, a support member 20B, and a nut 40. Since the nut 40 is the same as the nut 40 described in the first embodiment, the illustration is omitted.

The support member 20B has one third convex portion 82 on the support member side contact surface 30. The third convex portion 82 has a third inclined surface 84 that gradually becomes higher than the support member side contact surface 30 toward the first direction P, and a support member from an end portion of the third inclined surface 84 on the first direction P side. It has a second outer wall portion 86 formed toward the side contact surface 30. The third convex portion 82 is an example of the “first engaging portion” in the technique of the present disclosure.

On the other hand, the base member 10D is provided with a plurality of third recesses 72 on concentric circles of the second shaft 26 inserted through the insertion hole 14. A third inner wall portion 74 is formed on the P side of each of the third recesses 72 in the first direction. The third concave portion 72 and the third convex portion 82 are provided at corresponding positions. The third concave portion 72 is formed in a size that receives the entire third convex portion 82. The third recess 72 is an example of a "second engaging portion" in the technique of the present disclosure.

The function of the shaft position variable mechanism 103 having the above configuration will be described. When the support member 20B is rotated toward the P side in the first direction while the third convex portion 82 is received by the third concave portion 72, the second outer wall portion 86 and the third inner wall portion 74 of the third concave portion 72 are connected to each other. It engages non-rotatably and the rotation of the support member 20B is restricted. On the other hand, when the support member 20B is rotated on the Q side in the second direction, the third inclined surface 84 gets over between the plurality of third recesses 72 and rotates. The third convex portion 82 and the third concave portion 72 are examples of the “rotation regulating portion” according to the technique of the present disclosure.

In the shaft position variable mechanism 103, the support member 20B has a support member side contact surface 30 that comes into contact with the base member 10D. A plurality of third recesses 72 are provided as second engaging portions on the concentric circles of the second shaft 26 of the base member 10D, and the first engagement is performed at a position corresponding to the third recess 72 in the support member 20B. At least one third convex portion 82 is provided as a portion. The third convex portion 82 is a third inclined surface 84 that gradually becomes higher than the support member side contact surface 30 toward the first direction P that tightens the rotary fastening member 40, and the first direction P of the third inclined surface 84. It has a second outer wall portion 86 formed from an end portion toward the support member side contact surface 30.

According to the shaft position variable mechanism 103 having the above configuration, the same effect as that of the first embodiment can be obtained. That is, when the nut 40 is tightened, the third convex portion 82 and the third inner wall portion 74 of the third concave portion 72 are non-rotatably engaged with each other, thereby suppressing the co-rotation of the support member 20B when the nut 40 is tightened. In order to fulfill the function, the adjustment position of the first shaft 24 does not shift.

According to the shaft position variable mechanism 103, when the support member 20B is rotated in the first direction P, the second outer wall portion 86 and the third inner wall portion 74 of the third recess 72 are non-rotatably engaged and supported. When the rotation of the member 20B is restricted and the support member 20B is rotated in the second direction Q in the direction opposite to the first direction P, the third inclined surface 84 gets over between the plurality of third recesses 72 and is supported. The member 20B rotates. With this configuration, the support member 20B rotates when determining the position of the first shaft 24, but the support member 20B does not rotate when the nut 40 is tightened, so that the positioning and fixing of the first shaft 24 can be performed accurately. Can be achieved.

In the fifth embodiment described above, the third convex portion 82 is fixed to the support member side contact surface 30. However, as described with reference to FIGS. 9 and 10 in the second embodiment and the third embodiment, the third convex portion 82 may be supported by the elastic member. That is, a recess may be provided in the support member side contact surface 30, and a part of the third convex portion 82 may be supported by the recess so as to project from the support member side contact surface 30.

Further, the shapes or properties of the third convex portion 82 and the third concave portion 72 are not limited to the shapes and properties described in the fifth embodiment. For example, the shape of the third inner wall portion 74 of the third recess 72 can be formed as described with reference to FIG. 15A. Further, the shapes or properties of the third convex portion 82 and the third concave portion 72 can be configured as described with reference to FIG. 15B. As described above, the combination of the shape and properties of the third convex portion 82 and the shape and properties of the third concave portion 72 can be appropriately selected.

In the above embodiment, the predetermined first direction P is the rotation direction for tightening the nut 40, and the second direction Q, which is the opposite direction, is the rotation direction for loosening the nut 40. However, it is not limited to the direction of rotation shown. In order to adjust the meshing between the gears of the base member 10 to which the gear 4 is attached and the support member 20 having another gear 2, the rotation direction convenient for arrangement may be set as the second direction Q, which is the first direction. A nut 40 tightened with P may be used.

In the above embodiment, the nut 40 is used as the fixing member. The method of fastening with nuts has an advantage that it can be easily carried out without using a special jig for fastening. Also, unlike welding, it is possible to redo the positioning if necessary. However, the fixing member is not limited to the nut.

In the above embodiment, the shaft position variable mechanism has only one convex portion. However, two or more may be provided.

The number of concave portions corresponding to the convex portions shown in the above embodiment is merely an example, and is not limited to the number shown. The number of recesses increases as they are formed closer to each other, and the larger the number, the finer the engagement position can be adjusted. However, since the structure becomes complicated as the number increases, the number of recesses may be set in consideration of the required positioning accuracy.

The shaft position variable mechanism shown in the above embodiment may be mounted on the lens driving device. FIG. 13 shows an example of the configuration of the image pickup apparatus 200. The image pickup device 200 is, for example, an image pickup device for television. The image pickup device 200 includes an objective lens 202A, a focus lens 202B, an image pickup element 204, and a lens drive device 206. The objective lens 202A, the focus lens 202B, and the image sensor 204 are arranged in the order of the objective lens 202A, the focus lens 202B, and the image sensor 204 along the optical axis L1 from the subject side.

The subject light indicating the subject is incident on the objective lens 202A, and the subject light incident on the objective lens 202A is imaged on the image sensor 204 via the focus lens 202B. The image sensor 204 outputs an electric signal obtained by photoelectrically converting the subject light as image data. The lens driving device 206 includes a shaft position variable mechanism 1 and a slide mechanism 208.

The slide mechanism 208 is an example of a power transmission unit according to the technique of the present disclosure. The slide mechanism 208 holds the focus lens 202B slidably between the objective lens 202A and the image sensor 204 along the optical axis L1. The shaft position variable mechanism 1 operates the slide mechanism 208 by transmitting the power generated by the motor 6 (see also FIG. 1) to the slide mechanism 208. A power transmission mechanism is composed of a shaft position variable mechanism 1 and a motor 6. The slide mechanism 208 applies the rotational force obtained by rotating the first shaft 24 (see FIG. 3) by receiving the power generated by the motor 6, that is, the rotational force of the gear 2 (see FIG. 3). It is converted into a linear force in the L1 direction of the optical axis. Then, the slide mechanism 208 slides the focus lens 202B along the optical axis L1 by transmitting the linear force obtained by converting the rotational force of the gear 2 to the focus lens 202B. The "straight-ahead force" referred to here is an example of "power" according to the technique of the present disclosure. Further, here, an example in which the rotational force of the gear 2 is converted into a linear force by the slide mechanism 208 has been described, but the technique of the present disclosure is not limited to this, and the rotation of the gear 4 (see FIG. 3) is not limited to this. The force may be converted into a linear force by the slide mechanism 208.

In the example shown in FIG. 13, the lens driving device 206 is applied to the focus lens 202B, but the technique of the present disclosure is not limited to this, and is applied to a movable lens such as a zoom lens. be able to. Further, the image pickup device 200 can be applied not only to an image pickup device for television but also to a movable lens used in a single-lens reflex camera, a personal computer, a smart device, a wearable terminal, and the like.

As used herein, "A and / or B" is synonymous with "at least one of A and B." That is, "A and / or B" means that it may be only A, only B, or a combination of A and B. Further, in the present specification, when three or more matters are connected and expressed by "and / or", the same concept as "A and / or B" is applied.

All documents, patent applications and technical standards described herein are to the same extent as if the individual documents, patent applications and technical standards were specifically and individually stated to be incorporated by reference. Incorporated by reference in the document.

1,101,102,103 Shaft position variable mechanism 2 Gear 4 Gear 6 Motor 10, 10A, 10B, 10C, 10D Base member 12 Base member side contact surface (first contact surface)
14 Insertion holes 16, 16A, 16B First convex portion (second engaging portion)
17,17A Recess 18 Spring (elastic member)
19 Elastic deformation part (elastic member)
20, 20A Support member 22 Main body 24 First shaft 25 Rotation regulation part 26 Second shaft 28 Fitting part 29 Male screw 30 Support member side contact surface (second contact surface)
32 First recess (first engaging portion)
34 First inclined surface 36 First inner wall part 40 Rotating fastening member (fixing member)
52 Second convex part (second engaging part)
54 Second inclined surface 56 First outer wall portion 62 Second recess (first engaging portion)
64 Second inner wall 72 Third recess (second engaging part)
74 Third inner wall portion 82 Third convex portion (first engaging portion)
84 Third inclined surface 86 Second outer wall portion 117 Inner wall 200 Image pickup device 202A Objective lens 202B Focus lens 204 Image pickup element 206 Lens drive device 208 Slide mechanism

Claims (15)

A support member to which the first shaft and the second shaft eccentric with respect to the first shaft are connected, and
A base member into which the second shaft is rotatably inserted and
A fixing member that fixes the second shaft to the base member,
A first engaging portion provided on the base member side of the support member and a second engaging portion provided on the support member side of the base member and engaged with the first engaging portion. The first engaging portion and the second engaging portion are rotatably engaged only in one rotation direction of the second shaft, and the shaft position is variable. mechanism. The fixing member is a rotary fastening member.
The shaft position variable mechanism according to claim 1, wherein the rotary fastening member engages with the outer peripheral surface of the second shaft to fix the support member to the base member. The base member is provided with at least one first convex portion as the second engaging portion, and the second is on a concentric circle of the second shaft at a position corresponding to the first convex portion of the support member. The shaft position variable mechanism according to claim 2, wherein a plurality of first recesses are provided as engaging portions of 1. The first recess has a first inclined surface whose depth gradually becomes shallower toward the first direction in which the rotary fastening member is tightened, and a first inner wall portion at an end portion in a second direction opposite to the first direction. The shaft position variable mechanism according to claim 3. When the support member is rotated in the first direction, the rotation of the support member is restricted by the non-rotatable engagement between the first convex portion and the first inner wall portion of the first concave portion, and the first The axial position variable mechanism according to claim 4, wherein when the support member is rotated in two directions, the support member rotates when the first inclined surface gets over the first convex portion. The base member has a recess and
Any one of claims 3 to 5, wherein the first convex portion is attached to the recess via an elastic member so as to be pushable into the recess and project outward from the recess. The shaft position variable mechanism described in the section. The base member has a first contact surface that comes into contact with the support member.
The base member is provided with at least one second convex portion as the second engaging portion, and the second convex portion is placed on a concentric circle of the second shaft at a position corresponding to the second convex portion of the support member. The shaft position variable mechanism according to claim 2, wherein a plurality of second recesses are provided as the engaging portion of 1. The second convex portion is formed from a second inclined surface that gradually becomes higher than the first contact surface toward the second direction in which the rotary fastening member is loosened, and an end portion of the second inclined surface in the second direction. The axial position variable mechanism according to claim 7, further comprising a first outer wall portion formed toward the first contact surface. When the support member is rotated in the first direction opposite to the second direction, the support member is engaged with the first outer wall portion and the second inner wall portion of the second recess so as not to rotate. The shaft position variable mechanism according to claim 8, wherein when the support member is rotated in the second direction, the support member rotates when the support member gets over the second inclined surface. The base member has a recess and
Any one of claims 7 to 9 which is attached to the recess via an elastic member so that the second convex portion can be pushed into the recess and protrudes outward from the recess. The shaft position variable mechanism described in the section. The support member has a second contact surface that comes into contact with the base member.
A plurality of third recesses are provided as the second engaging portion on the concentric circles of the second shaft of the base member, and the first engaging is provided at a position corresponding to the third recess in the support member. The shaft position variable mechanism according to claim 2, wherein at least one third convex portion is provided as a portion. The third convex portion is formed from a third inclined surface that gradually becomes higher than the second contact surface toward the first direction in which the rotary fastening member is tightened, and an end portion of the third inclined surface in the first direction. The axial position variable mechanism according to claim 11, further comprising a second outer wall portion formed toward the second contact surface. When the support member is rotated in the first direction, the rotation of the support member is restricted by the non-rotatable engagement between the second outer wall portion and the third inner wall portion of the third recess. According to claim 12, when the support member is rotated in a second direction opposite to the first direction, the support member rotates when the third inclined surface gets over between the plurality of the third recesses. Described shaft position variable mechanism. The shaft position variable mechanism according to any one of claims 1 to 13, wherein the first shaft is a gear shaft that rotatably supports the gear. The shaft position variable mechanism according to any one of claims 1 to 14,
A power transmission mechanism that transmits to a lens the power obtained by rotating the first shaft or the second shaft connected to the support member included in the shaft position variable mechanism by receiving the power of a motor. When,
Lens drive device.