JP2001208949A - Energizing member, annular member and lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energizing member capable of eliminating the backlash of a fitted annular member by energizing the annular member in a rotary shaft direction and the radial direction, and the annular member and a lens barrel. SOLUTION: This energizing member is an annular member energizing member 240 formed to be inserted in the fitting part of a pair of annular members relatively rotated and fitted. The member 240 is equipped with a base part 241 pressed to contact with either of the annular members in a state where a pair of the annular members is fit, and singly acting parts 242 and 244 formed to be extended from the base part 241 and energizing the other annular member in the rotary shaft direction and the radial direction in relative rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a biasing member, an annular member, and a lens barrel. In particular, the present invention relates to an urging member, an annular member, and a lens barrel for urging in the axial and radial directions.

[0002]

2. Description of the Related Art Focus adjustment of a camera is performed by driving a focus lens of a photographing lens back and forth in an optical axis direction. In the lens barrel of the focus lens, a lens support tube holding the lens and a fixed tube holding the lens support tube are screwed together via a helicoid screw. Therefore, when the lens support cylinder is rotated by a stepping motor or manually, the lens support cylinder holding the lens moves back and forth in the optical axis direction by the action of the helicoid screw.

In such a lens barrel, the helicoid screw has a backlash or play, and the backlash causes the optical axis of the lens to shift, making it difficult to focus, or causing noise due to the backlash. The problem had arisen.

Therefore, an elastic member is provided between the fixed cylinder and the lens support cylinder, and backlash is removed by the urging force of the elastic member. Japanese Patent Laying-Open No. 9-189835 (publication date: July 22, 1997) discloses a lens driving device using a leaf spring for urging a lens support frame. JP-A-6-148495 (published May 27, 1994)
Japanese Patent Application Laid-Open (JP-A) No. 7-216, pp. 1 to 3 discloses a lens barrel in which an elastic member for urging the annular member in the radial direction is interposed.

[0005]

Problems to be Solved by the Invention
In the lens driving device disclosed in Japanese Patent Application Laid-Open No. 5 (1994) -2005, the lens supporting frame is urged in the optical axis direction. In either case, there is a problem in that there is a restriction on space and a sufficient load cannot be applied.

Accordingly, an object of the present invention is to provide a biasing member, an annular member, and a lens barrel which can solve the above-mentioned problems. This object is achieved by a combination of features described in the independent claims.
The dependent claims define further advantageous embodiments of the present invention.

[0007]

In order to solve the above-mentioned problems, in a first embodiment of the present invention, a pair of annular members are formed so as to be inserted into fitting portions of a pair of annular members which are fitted by rotating relative to each other. An annular member urging member, wherein in a state where the pair of annular members are fitted, a base portion pressed against one of the annular members, and formed to extend from the base portion;
A single acting portion for urging the other of the annular members in the rotational axis direction and the radial direction of the relative rotation.

One of the pair of annular members is a fixed member that does not rotate in the rotation direction of the relative rotation, and the other of the pair of annular members rotates in the rotation direction of the relative rotation,
A rotating member that moves in the direction of the rotation axis of the relative rotation with respect to the fixing member, wherein the base portion is pressed against the fixing member, and the operating portion moves the rotating member in the rotation axis direction and the radial direction. The rotating member may be biased and pressed by the fitting portion with the fixed member while rotating.

According to a second aspect of the present invention, there is provided a biasing member for an annular member formed at a fitting end of a pair of annular members which are fitted by being rotated relative to each other. A base portion that is fitted and fixed to the mating end portion, and is formed so as to extend from the base portion, and in a state where the pair of annular members are fitted, the rotational axis direction and the diameter of the other relative rotation of the annular member A single acting portion for biasing the directional movement to the position of the fitting end.

One of the pair of annular members is a fixed member that does not rotate in the rotation direction of the relative rotation, and the other of the pair of annular members rotates in the rotation direction of the relative rotation,
A rotating member that moves in a rotation axis direction of the relative rotation with respect to the fixed member, wherein the base portion is fitted and fixed to a fitting end of the fixed member, and the action portion is configured to rotate the rotating member. A bias may be applied to regulate the axial and radial movement to the position of the fitting end, and the rotating member may be pressed by a fitting portion with the fixing member while rotating. .

In the first or second mode, the radial bias applied by the operating portion is a force for pressing the rotating member in a fixed direction perpendicular to the rotation axis, and the rotating member is The trajectory of the point at which the rotating member is pressed by the fitting portion with the fixing member when rotated relative to the fixed member may be substantially a line segment.

[0012] The operating portion may include an elastic member for urging the rotating member in the rotation axis direction and the radial direction. The elastic member is a plurality of leaf springs, which are arranged in a circle around the rotation axis when viewed in a cross section perpendicular to the rotation axis, and biases the rotation member in the rotation axis direction. At least one of the plurality of leaf springs may have a protrusion for urging the rotating member in the radial direction.

The leaf spring having the projection is provided at substantially right and left positions substantially symmetrical with respect to a straight line passing through the center of rotation when viewed in a cross section perpendicular to the rotation axis. May be pressed in the fixed direction perpendicular to the rotation axis.

When viewed in a cross section perpendicular to the rotation axis, the leaf springs are arranged at three positions at equal intervals in the circular arrangement, and two of the three leaf springs are included in the three leaf springs. May have the protrusion, and the remaining one leaf spring may not have the protrusion.

According to a third aspect of the present invention, there is provided a lens barrel having a lens group mounted thereon, the lens barrel having the lens group mounted thereon and rotating around the optical axis of the lens group, A fixed cylinder that holds the rotating cylinder, and biases the rotating cylinder in the rotation axis direction and the radial direction of the rotation, and moves the rotating cylinder in the rotation axis direction with respect to the fixed cylinder while rotating. And a biasing portion that presses the rotating cylinder against a fitting portion with the fixed cylinder when the rotating cylinder is engaged.

The urging portion in the third embodiment is the same as the first embodiment.
Alternatively, any of the urging members in the second embodiment may be used.

According to a fourth aspect of the present invention, there is provided a pair of annular members which are relatively rotated and screwed into each other. It is characterized in that one of the members is radially biased with respect to the other.

One of the pair of annular members is a fixed member that does not rotate in the rotation direction of the relative rotation, and the other of the pair of annular members rotates in the rotation direction of the relative rotation,
A rotating member that moves in a rotation axis direction of the relative rotation with respect to the fixed member, wherein the wire spring is attached so as to form a part of a screw of a threaded portion of the rotating member, and The rotating member may be pressed in a direction perpendicular to the rotation axis by the urging, and the rotating member may be pressed by a fitting portion with the fixed member while rotating.

One of the pair of annular members is a fixed member that does not rotate in the rotation direction of the relative rotation, and the other of the pair of annular members rotates in the rotation direction of the relative rotation,
A rotating member that moves the fixing member in the direction of the rotation axis of the relative rotation, wherein the wire spring is attached so as to constitute a part of a screw of a screwing portion of the fixing member, and the radial bias is applied. By pressing the rotating member in a certain direction perpendicular to the rotation axis, the rotating member is pressed by the fitting portion with the fixed member while rotating, and the locus of the pressed point is substantially a line segment. You may do so.

The wire spring may have a projection for urging the rotating member in the direction of the rotation axis.

When viewed in a cross section perpendicular to the rotation axis, the wire spring is provided on the circumference of the screw surface at substantially left and right positions substantially symmetric with respect to a straight line passing through the center of rotation. You may make it press in the said direction perpendicular | vertical to the said rotation axis.

According to a fifth aspect of the present invention, there is provided a lens barrel having a lens group mounted thereon, the lens barrel being mounted thereon and rotating around an optical axis of the lens group; A fixed cylinder that holds the rotary cylinder, and a wire spring attached so as to form a part of a screw of a threaded portion of the rotary cylinder and the fixed cylinder, wherein the rotary cylinder has a diameter relative to the fixed cylinder. And a biasing portion for biasing in the direction.

The wire spring according to the fifth embodiment is the same as the fourth embodiment.
Any of the wire springs in the embodiment described above may be used.

Note that the above summary of the present invention does not enumerate all of the necessary features of the present invention, and a sub-combination of these features can also be an invention.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described through embodiments of the present invention. However, the following embodiments do not limit the claimed invention and have the features described in the embodiments. Not all combinations are essential to the solution of the invention.

(First Embodiment) A first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view of a camera 10 according to the present embodiment. The camera 10 includes a focus lens barrel 20,
The camera includes a zoom lens barrel 30, an imaging unit 40, and a finder unit 50. The focus lens barrel 20 includes a focus lens and a drive unit for adjusting focus. The zoom lens barrel 30 includes a zoom lens and a drive unit for adjusting the zoom. The imaging unit 40 captures an image formed by the focus lens and the zoom lens. The imaging unit 40 may include a silver halide film or a CCD. The finder unit 50 includes a finder lens and can observe a subject.

FIG. 2 is a front view of a focus lens barrel 20 as an example of the lens barrel of the present embodiment. FIG.
3 is a cross-sectional view of the focus lens barrel 20. 2 and 3, the focus lens barrel 20 and
The urging member 240 of the present embodiment will be described. The focus lens barrel 20 includes a fixed barrel 210 and a lens frame 212.
, Lens 213, connecting gear 214, drive gear 21
5, 216, 217, 218 and focus motor 2
19, focus stopper 220 and O-shaped ring 2
30, a helicoid screw 234, a guide 260, and a protrusion 262. Fixed cylinder 210 and lens frame 21
Reference numeral 2 denotes an example of a pair of annular members each serving as a fixed member and a rotating member.

The focus motor 219 has a drive gear 2
A stepping motor that rotates the connecting gear 214 while adjusting the torque by 15, 216, 217, and 218.

The connecting gear 214 is connected to a lens frame 212 holding a lens 213. The lens frame 212 has a guide 260 in which a groove is formed in the rotation axis direction.
The fourteen protrusions 262 move back and forth in the groove of the guide 260. By the function of the guide 260, the lens frame 212
It can move back and forth with respect to the connecting gear 214.

The lens frame 212 and the fixed cylinder 210 are fitted with helicoid screws 234 and 235. When the focus motor 219 rotates the connection gear 214, the lens frame 212 moves back and forth with respect to the fixed cylinder 210 while rotating.

Since the helicoid screws 234 and 235 have back slash (play), play occurs in the rotation axis direction and the radial direction. The O-shaped ring 230 is a circular ring that holds the urging member 240, is fitted into the fixed cylinder 210, and is pressed against the connecting gear 214. The urging member 240 is fitted into the O-ring 230, and the lens frame 2
12 is urged in both the rotational axis direction and the radial direction. By the function of the urging member 240, backlash due to backlash can be eliminated.

FIG. 4 is a front view of the urging member 240.
FIG. 5 is a perspective view of the urging member 240. 4 and 5
The urging member 240 will be described with reference to FIG. The biasing member 240 has a plate 241, a leaf spring 242, and a protrusion 244. The plate 241 is an example of a base portion, and the leaf spring 242 and the protrusion 244 are an example of a single acting portion that extends from the base portion and is integrally formed.

The plate 241 is a circular member fitted into the O-ring 230 and pressed against the connecting gear 214. The leaf spring 242 extends from the plate 241 and projects in the direction of the rotation axis, and urges the lens frame 212 in the direction of the rotation axis. The leaf spring 242 includes a plate 241
Are arranged at equal intervals on the circumference of the lens frame 21.
2 can be urged with a uniform force in the direction of the rotation axis.

The projection 244 is provided at the tip of the leaf spring 242 and urges the lens frame 212 in the radial direction. Protrusion 24
4 is provided on two leaf springs 242 and is not provided on the remaining one leaf spring 242. The two projections 244 apply a radial bias indicated by arrows 282 and 284. When these urging forces are combined, a force in the direction of arrow 280 results, and the lens frame 212 is pressed against the fixed cylinder 210 in the direction of arrow 280.

As described above, the urging member 240 urges the lens frame 212 in the rotation axis direction and the radial direction, and
2 is pressed against the fixed cylinder 210 with a sufficient force, so that play between the lens frame 212 and the fixed cylinder 210 can be eliminated. Further, while the lens frame 212 is rotating, the locus of the point where the lens frame 212 is pressed against the fixed barrel 210 at the fitting portion with the fixed barrel 210 is always a straight line parallel to the optical axis. Draw. Therefore, the lens frame 2
Despite the rotation of 12, the optical axis of the lens frame 212 does not shift, so that the focusing performance can be ensured.

In the above description, three leaf springs 242 of the biasing member 240 are provided on the circumference of the plate 241; however, two or four or more leaf springs 242 may be provided. In addition, a projection is provided at the position of the leaf spring 242 and at the tip of the leaf spring 242 so that the combined force of the urging forces of the projections 244 becomes a force for pressing the lens frame 212 against the fixed cylinder 210 in a fixed direction. It is preferable to determine whether to provide the part 244.

According to the urging member 240 of this embodiment, it is possible to urge the lens frame 212 in both the optical axis direction and the radial direction.
It is possible to eliminate play at the fitting portion between the lens frame 212 and the fixed cylinder 210 due to being pressed in a certain direction with respect to zero. Since the urging member 240 has an integrated functioning portion that can simultaneously urge in the optical axis direction and the radial direction, it can be provided in a small space between the fitting portion between the lens frame 212 and the fixed cylinder 210. Therefore, the urging member 240
Can be used in an optical system that does not have enough space to set up a spring to remove backlash, such as an autofocus lens barrel using a helicoid screw. , And good autofocus performance can be secured.

(Second Embodiment) A second embodiment of the present invention will be described. FIG. 6 is a cross-sectional view of the focus lens barrel 20 provided with the urging member 246 of the present embodiment.
The urging member 246 of the present embodiment is different from the first embodiment in that the urging member 246 is provided at an end point of the fixed barrel 210 and urges the lens frame 212 from outside. The other configurations and operations are the same as those of the first embodiment, and thus the description thereof will be omitted, and only the configurations and operations different from those of the first embodiment will be described. Urging member 2
The stopper 46 is fitted into a groove provided at an end of the fixed barrel 210 and is provided at a stopper 264 provided at an end of the fixed barrel 210.
Pressed to. The urging member 246 urges the lens frame 212 in the rotation axis direction.

FIG. 7 is a front view of the urging member 246.
The biasing member 246 has a plate 241 and a leaf spring 242. The plate 241 is fitted into a groove provided at an end of the fixed cylinder 210, and is pressed against a stopper 264 provided at an end of the fixed cylinder 210. The leaf spring 242 extends from the plate 241 and projects in the direction of the rotation axis, and urges the lens frame 212 in the direction of the rotation axis.

In the above description, the plate 241 cuts a part of the circumference. However, the plate 241 may be circular and have no cutout. Leaf spring 2 of urging member 246
42 are provided on the circumference of the plate 241,
Three or more lens frames may be provided, and are preferably arranged at equal intervals on the circumference of the plate 241 so as to urge the lens frame 212 with a uniform force in the rotation axis direction.

The urging member 246 of this embodiment may be used in combination with the urging member 240 of the first embodiment.
The shortage of the load by the urging member 240 of the first embodiment can be compensated for by the urging member 246 of the present embodiment, and the occurrence of backlash can be more reliably prevented.

(Third Embodiment) A third embodiment of the present invention will be described. FIG. 8 is a cross-sectional view of the focus lens barrel 20 provided with the biasing member 248 of the present embodiment.
The urging member 248 of the present embodiment is provided at an end point of the fixed cylinder 210, and is different from the first embodiment in that the urging member 248 urges the lens frame 212 from the outside. The other configurations and operations are the same as those of the first embodiment, and thus the description thereof will be omitted, and only the configurations and operations different from those of the first embodiment will be described. The urging member 248 is different from the second embodiment in that the urging member 248 urges the lens frame 212 in both the rotation axis direction and the radial direction. The biasing member 248 is fitted into a groove provided at an end of the fixed cylinder 210, and a stopper 2 provided at an end of the fixed cylinder 210.
64. The urging member 248 is connected to the lens frame 212.
Can be urged in the rotation axis direction and the radial direction.

FIG. 9 is a front view of the urging member 248.
FIG. 10 is a perspective view of the urging member 248. The urging member 248 will be described with reference to FIGS. The biasing member 248 includes a plate 241, a leaf spring 242, and a protrusion 244. The plate 241 is a fixed cylinder 210
And is pressed into contact with a stopper 264 provided at the end of the fixed cylinder 210. The leaf spring 242 extends from the plate 241 and projects in the direction of the rotation axis, and urges the lens frame 212 in the direction of the rotation axis.

The projection 244 is provided at the tip of the leaf spring 242 and urges the lens frame 212 in the radial direction. The two projections 244 apply a radial bias indicated by arrows 282 and 284. When these urging forces are combined, they become forces in the direction of arrow 280, and the lens frame 212 is fixed to the fixed cylinder 21.
0 is pressed in the direction of arrow 280.

As described above, the urging member 248 urges the lens frame 212 in the rotation axis direction and the radial direction, and
2 is pressed against the fixed cylinder 210 with a sufficient force, so that play between the lens frame 212 and the fixed cylinder 210 can be eliminated.

In the above description, the plate 241 is partially cut in the circumference, but the plate 241 may be circular and have no cutout. Leaf spring 2 of urging member 248
42 are provided on the circumference of the plate 241,
Three or more lens frames may be provided, and are preferably arranged at equal intervals on the circumference of the plate 241 so as to urge the lens frame 212 with a uniform force in the rotation axis direction. Also, the protrusion 2
The projection 244 is provided at the position of the leaf spring 242 and at the tip of the leaf spring 242 so that the force obtained by combining the urging forces of the 44 becomes a force for pressing the lens frame 212 against the fixed cylinder 210 in a fixed direction. It is preferable to determine whether or not.

The urging member 248 of this embodiment may be used in combination with the urging member 240 of the first embodiment.
The shortage of the load by the urging member 240 of the first embodiment can be compensated for by the urging member 248 of the present embodiment, and the occurrence of backlash can be more reliably prevented.

(Fourth Embodiment) A fourth embodiment of the present invention will be described. FIG. 11 is a diagram showing an annular member 270 in which a wire spring 250 is formed on a part of the helicoid screw on the outer peripheral surface. The annular member 270 is applied to a fitting portion of the lens frame 212 of the first, second, and third embodiments that fits with the fixed barrel 210.

On the outer periphery of the annular member 270, helicoid screw threads 236 and screw grooves 237 are formed alternately, but a part of the screw thread 236 is cut out, and the wire spring 250 has the screw thread 236. Is formed so as to constitute a part of The wire spring 250 can apply a radial bias to the lens frame 212.

FIG. 12 is a front view showing the position of a wire spring 250 provided on the outer periphery of the annular member 270. Two wire springs 250 apply a radial bias as indicated by arrows 282 and 284. Combining these biases,
The force in the direction of arrow 280 is generated, and the lens frame 212 is pressed against the fixed cylinder 210 in the direction of arrow 280.

In the above description, two wire springs 250 are provided on the outer periphery of the annular member 270, but three or more wire springs may be provided. In this case, it is preferable to determine the position of the wire spring 250 so that the combined force of the plurality of wire springs 250 becomes a force pressing the lens frame 212 against the fixed cylinder 210 in a fixed direction.

According to the wire spring 250 of this embodiment, the lens frame 212 can be urged in the radial direction, and the lens frame 212 can be pressed against the fixed cylinder 210 in a fixed direction, so that play can be eliminated. it can. Since the wire spring 250 is formed so as to constitute a part of the screw of the screwing portion, the lens frame 212 is formed.
And the fixed cylinder 210 can be provided in a small space of the threaded portion. Therefore, the wire spring 250 can be used for an optical system such as an auto-focus lens barrel using a helicoid screw, in which a space for installing a backlash removing spring cannot be obtained. hand,
The occurrence of backlash can be prevented, and good autofocus performance can be ensured.

(Fifth Embodiment) A fifth embodiment of the present invention will be described. FIG. 13 is a diagram showing an annular member 272 in which a wire spring 252 is formed on a part of the helicoid screw on the inner peripheral surface. The annular member 272 is applied to a fitting portion of the fixed barrel 210 of the first, second, and third embodiments that is fitted to the lens frame 212.

A thread 236 of the helicoid screw and a thread groove 237 are formed alternately on the inner periphery of the annular member 272, but a part of the thread 236 is cut out, and the wire spring 252 is formed by a thread. 236 to form a part thereof. The wire spring 252 can apply a radial bias to the lens frame 212.

FIG. 14 is a front view showing the position of a wire spring 252 provided on the inner periphery of the annular member 272. The two wire springs 252 apply a radial bias indicated by arrows 282 and 284. Combining these biases,
The force in the direction of arrow 280 is generated, and the lens frame 212 is pressed against the fixed cylinder 210 in the direction of arrow 280.

Fixed tube 2 using annular member 272 for fitting portion
In the case of 10, the wire spring 252 provided on the fixed cylinder 210 side
, The lens frame 212 is always pressed against the fixed cylinder 210 in the same direction regardless of the rotation of the lens frame 212, so that the optical axis of the lens frame 212 does not shift.

According to the wire spring 252 of the present embodiment, the lens frame 212 can be pressed against the fixed cylinder 210 in a fixed direction, and play can be eliminated. Further, since the wire spring 252 is provided on the fixed cylinder 210 side, the lens frame 212 is fixed to the fixed cylinder 21 regardless of the rotation of the lens frame 212.
0 can always be pressed in the same direction, and the optical axis of the lens frame 212 does not shift. Wire spring 252
Can be used in a threaded portion of an autofocus lens barrel using a helicoid screw to prevent backlash and ensure good autofocus performance.

In the above description, two wire springs 252 are provided on the inner periphery of the annular member 272, but three or more wire springs 252 may be provided. In this case, it is preferable to determine the position of the wire spring 252 such that the combined force of the urging forces of the plurality of wire springs 252 becomes a force for pressing the lens frame 212 against the fixed cylinder 210 in a fixed direction.

The wire spring 250 according to the fourth and fifth embodiments.
And 252, as shown in FIGS. 15 and 16, may be provided with a protrusion 254 for biasing in the rotation axis direction. By providing the projections 254 on the wire springs 250 and 252, it is possible to simultaneously urge in the radial direction and the rotation axis direction,
The play of the helicoid screw can be more reliably prevented.

Although the embodiments have been described above, the technical scope of the present invention is not limited to these descriptions. It is understood by those skilled in the art that various changes or improvements can be made to these embodiments.

As a first modification, the plate 241 of the urging members 240, 246 and 248 is
Although pressed against the connecting gear 214, it may be pressed against the fixed cylinder 210. The plates 241 of the urging members 240, 246 and 248 are pressed against the lens frame 212, and the leaf springs 242 of the urging members 240, 246 and 248
10 may be biased. Further, the urging member 240,
246 and 248 are the lens frame 212 or the fixed cylinder 21
0 may be formed.

As a second modification, the urging member 240 of the first embodiment may be used in combination with the urging member 246 or 248 of the second or third embodiment. In the first embodiment, the urging member 240 is inserted into the fitting portion between the lens frame 212 and the fixed barrel 210 to urge the lens frame 212 from the inside. In the second or third embodiment, the urging member 240 is used. 246 or 248 is provided at an end point of the fixed cylinder 210 and urges the lens frame 212 from the outside. For example, the interposed urging member 240 has a leaf spring 242 and a protrusion 244, and urges in the optical axis direction and the radial direction.
But without the protrusion 244 and configured to be urged only in the optical axis direction. The urging member 240 and the urging member 246 are provided.
Alternatively, the combination of 248 may realize the biasing in the optical axis direction and the radial direction.

As a third modification, in the fourth and fifth embodiments, the wire spring is provided so as to form a part of the thread. However, the wire spring is provided in the thread groove, and the bias in the radial direction is provided. May be given. In the lens barrel, wire springs may be provided on both the fixed barrel 210 and the lens frame 212 to apply a radial bias to each other to apply a sufficient biasing force.

In the above description, the urging member 240,
Although 246 and 248 are used for a lens barrel of a camera, they can be used for a pair of annular members that are generally fitted, and one ring member can be urged against the other ring member to prevent backlash. it can. Also, the annular members 270, 27
Although 2 was used for a lens barrel of a camera, it can be generally used as a pair of annular members that are screwed together. One of the annular members is formed by forming wire springs 250 and 252 on the screw of the screwed portion. It is possible to prevent backlash by urging the other annular member.

Further, the urging members 240, 246, 248,
The material of the wire springs 250 and 252 may be stainless steel or phosphor bronze.

As described above, according to the urging member, the annular member, and the lens barrel of the present invention, the same member can be urged in the direction of the rotation axis and in the radial direction, and the space can be saved sufficiently. A large load can be applied to prevent rattling of the fitting portion or the screwing portion of the annular member.

Although the present invention has been described with reference to the embodiment, the technical scope of the present invention is not limited to the scope described in the above embodiment. Various changes or improvements can be added to the above embodiment. It should be noted that such modified or improved embodiments may be included in the technical scope of the present invention.
It is clear from the description of the claims.

[0068]

As is apparent from the above description, according to the present invention, the annular member is urged in the direction of the rotation axis and in the radial direction, and the play of the fitting portion of the annular member can be eliminated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a camera 10 according to a first embodiment.

FIG. 2 is a front view of a focus lens barrel 20 as an example of the lens barrel according to the first embodiment.

FIG. 3 is a focus lens barrel 20 according to the first embodiment.
FIG.

FIG. 4 is a front view of an urging member 240 according to the first embodiment.

FIG. 5 is a perspective view of a biasing member 240 according to the first embodiment.

FIG. 6 is a cross-sectional view of a focus lens barrel 20 provided with a biasing member 240 according to the second embodiment.

FIG. 7 is a front view of an urging member 240 according to the second embodiment.

FIG. 8 is a cross-sectional view of a focus lens barrel 20 provided with a biasing member 240 according to a third embodiment.

FIG. 9 is a front view of an urging member 240 according to the third embodiment.

FIG. 10 is a perspective view of an urging member 240 according to the third embodiment.

FIG. 11 shows a part of a helicoid screw on an outer peripheral surface of a wire spring 2;
It is a figure showing annular member 270 in which 50 was formed.

FIG. 12 is a front view showing the position of a wire spring 250 provided on the outer periphery of an annular member 270.

[FIG. 13] A part of a helicoid screw on an inner peripheral surface is provided with a wire spring 2.
It is a figure which shows the annular member 272 in which 52 was formed.

FIG. 14 is a front view showing the position of a wire spring 252 provided on the inner periphery of the annular member 272.

FIG. 15 shows a protrusion 2 on a part of the helicoid screw on the outer peripheral surface.
Annular member 270 formed with wire spring 250 having 54
FIG.

FIG. 16 shows a protrusion 2 on a part of the helicoid screw on the inner peripheral surface.
Annular member 272 formed with wire spring 250 having 54
FIG.

[Explanation of symbols]

 Reference Signs List 10 camera 20 focus lens barrel 30 zoom lens barrel 40 imaging unit 50 finder unit 210 fixed barrel 212 lens frame 213 lens 214 connecting gear 215 drive gear 219 focus motor 220 focus stopper 230 O-ring 234, 235 helicoid screw 236 screw thread 237 Screw groove 240, 246, 248 Urging member 241 Plate 264 Stopper 242 Leaf spring 244 Projection 250, 252 Wire spring 254 Projection 260 Guide 262 Projection 270, 272 Ring member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shigeru Kondo 3-11-46 Izumi, Asaka-shi, Saitama Prefecture Inside Fujisha Shin Film Co., Ltd. (72) Inventor Issei Tamada 3-1-146 Izumi, Asaka-shi, Saitama No. Fujisha Shin Film Co., Ltd. F-term (reference) 2H044 BD01 BD16

Claims (16)

[Claims] An annular member urging member formed to be inserted into a fitting portion of a pair of annular members that are fitted by rotating relative to each other. A base portion pressed against one of the annular members; and a single acting portion formed to extend from the base portion and biasing the other of the annular members in the rotational axis direction and the radial direction of the relative rotation. A biasing member for an annular member, comprising: 2. One of the pair of annular members is a fixed member that does not rotate in the rotational direction of the relative rotation, and the other of the pair of annular members rotates in the rotational direction of the relative rotation. A rotating member that moves in the direction of the rotation axis of the relative rotation, the base portion is pressed against the fixed member, and the action portion urges the rotating member in the rotation axis direction and the radial direction. The biasing member for an annular member according to claim 2, wherein the rotating member is pressed by a fitting portion with the fixed member while rotating and moving. 3. A biasing member for an annular member formed at a fitting end of a pair of annular members which are fitted by being rotated relative to each other, wherein said biasing member is fitted and fixed to one of the fitting ends of said annular member. A base portion extending from the base portion, and in a state where the pair of annular members are fitted to each other, the other end of the annular member moves in the rotational axis direction and the radial direction of the relative rotation of the other of the annular members. A single acting portion for urging the member to restrict the position of the portion. 4. One of the pair of annular members is a fixed member that does not rotate in the direction of the relative rotation, and the other of the pair of annular members rotates in the direction of the relative rotation. A rotating member that moves in the direction of the rotation axis of the relative rotation with respect to the base member; the base portion is fitted and fixed to the fitting end of the fixed member; 4. The urging device according to claim 3, wherein the rotating member is biased so as to restrict the movement in the radial direction to the position of the fitting end, and the rotating member is pressed by a fitting portion with the fixing member while rotating. 4. The biasing member for an annular member according to claim 1. 5. The radial bias applied by the action portion is a force for pressing the rotating member in a fixed direction perpendicular to the rotation axis, and the rotating member is rotationally moved with respect to the fixed member. 5. The annular member urging member according to claim 2, wherein the locus of the point at which the rotating member is pressed by the fitting portion with the fixed member is substantially a line segment. 6. The urging member for an annular member according to claim 5, wherein the operating portion includes an elastic member for urging the rotating member in the rotation axis direction and the radial direction. 7. A plurality of plates, which are arranged in a circle around the rotation axis as viewed in a cross section perpendicular to the rotation axis, for urging the rotation member in the rotation axis direction, when viewed in a cross section perpendicular to the rotation axis. A spring, wherein at least one of the plurality of leaf springs includes:
The urging member for an annular member according to claim 6, further comprising a protrusion for urging the rotating member in the radial direction. 8. The leaf spring having the protrusion is provided at a substantially symmetrical left and right position with respect to a straight line passing through the center of rotation when viewed in a cross section perpendicular to the rotation axis, and The urging member for an annular member according to claim 7, wherein the rotating member is pressed in the fixed direction perpendicular to the rotation axis. 9. The plate spring, when viewed in a cross section perpendicular to the rotation axis, has three equally spaced intervals in the circular arrangement.
9. The leaf spring according to claim 8, wherein two leaf springs of the three leaf springs have the protrusion and the other leaf spring does not have the protrusion. Biasing member for an annular member. 10. A lens barrel on which a lens group is mounted, wherein the lens group is mounted, and a rotating cylinder that rotates around an optical axis of the lens group; When the rotating cylinder is urged in the rotation axis direction and the radial direction of the rotation, and the rotating cylinder is moved in the rotation axis direction with respect to the fixed cylinder while rotating, the rotating cylinder is rotated. A lens barrel comprising: a biasing portion for pressing a portion fitted to the fixed barrel. 11. A pair of annular members which are relatively rotated and screwed together, and a wire spring is attached so as to constitute a part of a screw of a screwed portion, and one of said pair of annular members is attached to the other. An annular member which is biased in a radial direction. 12. One of the pair of annular members is a fixed member that does not rotate in the direction of the relative rotation, and the other of the pair of annular members rotates in the direction of the relative rotation. The wire spring is attached so as to form a part of a screw of a threaded portion of the rotating member, and is urged in the radial direction. The annular member according to claim 11, wherein the rotating member is pressed in a direction perpendicular to the rotation axis, and the rotating member is pressed by a fitting portion with the fixed member while rotating. 13. One of the pair of annular members is a fixed member that does not rotate in the direction of the relative rotation, and the other of the pair of annular members rotates in the direction of the relative rotation. A rotating member that moves in the direction of the rotation axis of the relative rotation, wherein the wire spring is attached so as to constitute a part of a screw of a threaded portion of the fixing member, and the rotation is performed by the radial bias. The member is pressed in a fixed direction perpendicular to the rotation axis, and the rotation member is pressed by the fitting portion with the fixed member while rotating, and the locus of the pressed point is substantially a line segment. The annular member according to claim 11, wherein 14. The annular member according to claim 12, wherein the wire spring has a protrusion for urging the rotating member in the rotation axis direction. 15. The linear spring is provided at substantially right and left positions on a circumference of the screw surface, substantially symmetrical with respect to a straight line passing through a rotation center, when viewed in a cross section perpendicular to the rotation axis. The annular member according to claim 12, wherein the member is pressed in the direction perpendicular to the rotation axis. 16. A lens barrel having a lens group mounted thereon, the lens barrel being mounted thereon and rotating around an optical axis of the lens group, and being screwed with the rotary barrel to hold the rotary barrel. And a biasing unit that radially biases the rotating cylinder relative to the fixed cylinder by attaching a wire spring so as to form a part of a screw of a screw portion of the rotating cylinder and the fixed cylinder. A lens barrel comprising: