JP2012078717A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel equipped with a mechanism for removing a backlash which occurs between itself and a guide shaft member.SOLUTION: The lens barrel includes: a movable frame 10 which moves to the direction of an optical axis O of a lens barrel; a first guide shaft 12 installed in parallel with the optical axis of the lens barrel; a second guide shaft 13 installed in parallel with the first guide shaft; a first fitting part 10b installed in the movable frame so as to be fit into the first guide shaft; a second fitting part 10d installed in the movable frame so as to be fit into the second guide shaft; energizing means 17 installed in the first fitting part for energizing the movable frame to the direction of the second fitting part; and backlash removing means 10e installed in the second fitting part so as to remove a backlash which occurs when the second fitting part is fit into the second guide shaft.

Description

  The present invention relates to a lens barrel, and more particularly to a noise reduction mechanism for a lens barrel that includes a lens holding member that is driven by an actuator and moves in the optical axis direction.

  Conventionally, an optical image formed by a photographing optical system is sequentially converted into an image signal by a photoelectric conversion element such as a solid-state image sensor, and the obtained image signal is recorded on a recording medium as image data in a predetermined form. And a photographing device such as a digital camera or a video camera (hereinafter referred to as a digital camera) configured to include an image display device such as a liquid crystal display device (LCD) that reproduces and displays the image data recorded on the recording medium as a still image or a moving image. These are collectively referred to as a camera) and are generally put into practical use and widely used.

  A lens barrel applied to such a camera or the like has a plurality of lens holding members or the like that respectively hold a plurality of optical lenses. For example, a drive mechanism including an actuator and a drive member for moving in the direction along the optical axis is performed.

  In a conventional lens barrel, among the lens holding members that are moved in the optical axis direction using an actuator, the focus lens holding member related to the automatic focus adjustment operation is not only driven in the same direction but also reversed in the driving direction. High-speed driving in both forward and reverse directions is frequently performed. In recent years, in particular, it is required to drive the lens holding member at a high speed in order to correspond to the focus adjustment operation during the moving image shooting operation.

  Therefore, in the conventional lens barrel, in order to drive the lens holding member or the like at a higher speed and to stop it with higher accuracy, the lens holding member is biased by a spring so that the radial holding with respect to the lens holding member is prevented. For example, Japanese Patent Application Laid-Open No. 2007-232889 has proposed various types having a drive mechanism configured to eliminate the above as much as possible.

  The lens barrel disclosed by the above Japanese Patent Application Laid-Open No. 2007-232828 and the like has a lens holding member that holds a lens and receives a guide shaft and is guided by the guide shaft and moved in the optical axis direction, And an urging member (plate spring) provided between the guide shaft and the lens holding member, the urging member configured to urge the lens holding member in a direction toward the center of the guide shaft. Yes.

Japanese Patent Laid-Open No. 2007-232828

  However, in the conventional lens barrel having a configuration as disclosed in Japanese Patent Application Laid-Open No. 2007-232889 and the like, the backlash of one pair of guide shafts with respect to one guide shaft is suppressed, but the other guide shaft is provided. As a result, backlash remains in the direction along the plane perpendicular to the optical axis. That is, the lens holding member rotates very slightly with respect to one guide shaft center.

  In addition, if the backlash amount between the guide shaft and the lens holding member is large, vibrations are generated, which adversely affects the image.

  The present invention has been made in view of the above-described points, and an object of the present invention is to occur between a guide shaft member and a lens holding member that is moved in the optical axis direction along the guide shaft member. It is an object of the present invention to provide a lens barrel having a mechanism that can eliminate backlash.

  In order to achieve the above object, a lens barrel according to the present invention includes a moving frame that moves in the optical axis direction of the lens barrel, and a first guide shaft that is provided in parallel with the optical axis of the lens barrel. A second guide shaft provided in parallel with the first guide shaft, a first fitting portion provided on the moving frame and fitted with the first guide shaft, and provided on the moving frame. A second fitting portion that fits into the second guide shaft, and a biasing means that is provided in the first fitting portion and biases the moving frame in the direction of the second fitting portion; A backlash removing means for removing backlash in the fitting between the second fitting portion and the second guide shaft provided in the second fitting portion is provided.

  According to the present invention, it is possible to provide a lens barrel provided with a mechanism capable of eliminating the backlash generated between the lens holding member moved in the optical axis direction along the guide shaft member and the guide shaft member. .

The top view which takes out and shows the moving frame in the lens barrel of the 1st Embodiment of this invention The perspective view which takes out and shows the moving frame in the lens barrel of the 2nd Embodiment of this invention Plan view when viewed from the direction of arrow A in FIG. The principal part expanded sectional view which follows the [4]-[4] line of Drawing 2 The top view which takes out and shows the moving frame in the lens barrel of the 3rd Embodiment of this invention The perspective view which takes out and shows the moving frame in the lens barrel of the 4th Embodiment of this invention Plan view when viewed from the direction of arrow A in FIG. 3 is an enlarged three-side view of the main part of the urging means for pressing the first guide shaft in the present embodiment.

The present invention will be described below with reference to the illustrated embodiments. ◎
Each embodiment described below photoelectrically converts an optical image formed by, for example, an optical lens using a solid-state imaging device, converts an image signal obtained thereby into digital image data representing a still image or a moving image, A lens used in a camera configured to record digital data generated in this manner on a recording medium and to reproduce and display a still image or a moving image on a display device based on the digital image data recorded on the recording medium. This is an example when the present invention is applied to a lens barrel.

  Moreover, in each drawing used for the following description, each component may be shown with a different scale in order to make each component large enough to be recognized on the drawing. Therefore, according to the present invention, the number of constituent elements, the shape of the constituent elements, the ratio of the constituent element sizes, and the relative positional relationship of the constituent elements described in these drawings are limited to the illustrated embodiments. It is not a thing. In the following embodiments, the optical axis of the photographing optical system in the lens barrel is denoted by reference symbol O.

  The basic configuration of the lens barrel of each of the following embodiments to which the present invention is applied has substantially the same configuration as a lens barrel used in a conventional general camera or the like. Accordingly, in the following description, illustration and description of the same components as those of the conventional lens barrel will be omitted, and the characteristic components of the present invention will be described in detail below.

[First Embodiment]
FIG. 1 is a plan view showing a moving frame in the lens barrel of the first embodiment of the present invention.

  The moving frame 10 in the lens barrel of the present embodiment holds an optical lens 11 that constitutes a part of the photographing optical system, such as a focus lens, and a lens holding that moves in a direction along the optical axis O of the optical lens. It is a member.

  The moving frame 10 has a lens holding portion 10a, a first fitting portion 10b, and an L-shaped arm portion 10c. Among these, the lens holding part 10a is a part for holding a part of the optical lens 11 of the photographing optical system.

  The 1st fitting part 10b is a site | part fitted in a clearance fitting state so that the 1st guide shaft 12 mentioned later may be pinched | interposed. For this purpose, the first fitting portion 10b is formed so as to protrude outward from the outer periphery of the lens holding portion 10a, and has an opening outward so as to sandwich a single plane including the optical axis O. It is formed in a substantially channel shape which is a U-shaped concave portion directed to. The fitting portion may be a U-shaped recess or a U-shaped recess. The point is that the shaft can be sandwiched.

  The L-shaped arm portion 10c has a substantially L-shape projecting outward from the outer periphery of the lens holding portion 10a opposite to the first fitting portion 10b across the lens holding portion 10a. The L-shaped arm portion 10c is provided with a second fitting portion 10d including a through hole in a direction parallel to the optical axis O in the L-shaped base portion. A second guide shaft 13 (to be described later) is fitted to the second fitting portion 10d. Inside the second fitting portion 10d, a V-shape is formed of a pair of slopes so that the cross sections when cut by a plane orthogonal to the optical axis O face each other at a portion near the optical axis O. A bearing portion 10e formed of a concave portion is provided, and the bottom of the V-shaped concave portion is formed toward the optical axis. The bearing portion 10 e is a member that functions as a backlash removing means for removing backlash in the fitting between the second fitting portion 10 d and the second guide shaft 13.

  Therefore, the moving frame 10 is provided in parallel with the optical axis O, the first guide shaft 12 fitted in the first fitting portion 10b, and the second guide shaft 12 provided in parallel with the first guide shaft 12. The second guide shaft 13 fitted to the fitting portion 10d is supported so as to be movable back and forth in the direction along the optical axis O.

  The first guide shaft 12 is a shaft-shaped member having a circular cross section, and is a rotation restricting member (anti-rotation member) that restricts the moving frame 10 from rotating about the second guide shaft 13. Further, the first guide shaft 12 also serves as an auxiliary guide for the forward and backward movement of the moving frame 10 in the direction along the optical axis O.

  Similar to the first guide shaft 12, the second guide shaft 13 is a shaft-shaped member having a circular cross section, and is a guide member for guiding the moving frame 10 to advance and retreat in the direction along the optical axis O.

  Note that the arrangement of the two guide shafts 12 and 13 with respect to the moving frame 10 is such that a straight line connecting the axis center C of the first guide shaft 12 and the axis center D of the second guide shaft 13 passes through the optical axis O. Is set to

  A through hole 10f is formed in the L-shaped tip of the L-shaped arm 10c in a direction parallel to the optical axis O. A lead screw 14 constituting a part of the lens driving mechanism of the lens barrel is rotatably inserted into the through hole 10f. An output shaft of an actuator (not shown) is connected to one end of the lead screw 14 via a driving force transmission mechanism or the like. Thereby, the lead screw 14 can be rotated forward and backward by receiving the driving force of the actuator (not shown). Further, a nut 15 constituting a part of the lens driving mechanism is screwed into the lead screw 14. The nut 15 is disposed inside the lens barrel so as to be capable of moving back and forth in a direction along the optical axis O in a state in which the rotation is restricted with respect to the fixed portion 20a. In this state, the moving frame 10 is urged in a direction along the optical axis O toward the nut 15 by an urging member (not shown). With this configuration, the moving frame 10 and the nut 15 are always kept in contact with each other. When the lead screw 14 is rotated by receiving the driving force of the actuator, the nut 15 is moved in a direction along the optical axis O in a state where the rotation is restricted, and thus the moving frame 10 is moved along the optical axis O. It is comprised so that it may move forward and backward in the direction along.

  On the other hand, in the first fitting portion 10b, a spherical member 16 that is a pair of rolling members so as to sandwich the first guide shaft 12 fitted therein, and the pair of spherical members 16 are connected to the first fitting shaft 10b. An urging means 17 that presses toward the outer peripheral surface of the guide shaft 12 is disposed. In addition, although the thing of various forms can be applied as said urging | biasing means, the example which applied the coiled spring as an urging | biasing means is shown in this embodiment.

  The pair of spherical members 16 are respectively formed in round holes formed at positions facing each other of the facing wall portions 10bb of the first fitting portion 10b having a channel shape, or in the recesses 10bc made of square holes. On the other hand, it is stored so that it can roll freely. In this case, each spherical member 16 is in a state in which a part of the spherical member 16 protrudes slightly from the opening of the concave portion 10bc toward the outside from the surface of the wall portion 10bb, and the spherical member 16 itself does not protrude from the opening of the concave portion 10bc. Stored.

  At least one of the pair of recesses 10bc is compressed by the first guide shaft 12 via the spherical member 16 and accommodates the biasing means 17. Therefore, the urging means 17 presses at least one spherical member 16 toward the concave portion 10bc. Of course, the urging means 17 may be disposed in both the recesses 10bc, and each of the pair of spherical members 16 may be pressed.

  The arrangement of the pair of spherical members 16 and the biasing means 17 is set as follows. That is, as described above, the first guide shaft 12 is fitted to the first fitting portion 10b. The pair of spherical members 16 are disposed so as to press and hold the first guide shaft 12. In addition, the arrangement of the two guide shafts (12, 13) is such that a straight line connecting the axis center C of the first guide shaft 12 and the axis center D of the second guide shaft 13 passes through the optical axis O. Is set.

  In this configuration, the line B connecting the centers of the pair of spherical members 16 is positioned closer to the optical axis O than the axial center C of the first guide shaft 12 in the state of being fitted to the first fitting portion 10b. It is set to pass. Then, the urging means 17 has the spherical member 16 in the direction of the arrow X shown in FIG. 1, that is, the direction orthogonal to the plane including the optical axis O, that is, the axial centers C, It arrange | positions so that it may expand-contract in the direction orthogonal to the straight line which ties D.

  In this way, by setting the arrangement of the pair of spherical members 16 and the urging means 17, the urging means 17 causes one of the pair of spherical members 16 to face the outer peripheral surface of the first guide shaft 12. Press in the direction of arrow X. Then, the pair of spherical members 16 rolls along the outer peripheral surface of the first guide shaft 12, so that the moving frame 10 itself is in the direction of the arrow Y in FIG. Biased in the direction. At this time, on the second fitting portion 10 d side, the pair of inclined surfaces 10 ee of the bearing portion 10 e formed of a V-shaped recess is pressed toward the outer peripheral surface of the second guide shaft 13. Therefore, the play in the fitting between the second fitting portion 10d and the second guide shaft 13 is removed.

  As described above, according to the first embodiment, the pair of spherical members 16 and the biasing means 17 that presses the pair of spherical members 16 are connected to a predetermined portion (first fitting) of the moving frame 10. The center C of each of the first guide shaft 12 (rotation restricting member) and the second guide shaft 13 (guide member) is set in the direction in which the biasing means 17 biases and presses the spherical member 16. , D so as to be perpendicular to the line passing through D. A line B connecting the centers of the pair of spherical members 16 is positioned closer to the optical axis O than the axial center C of the first guide shaft 12 in the state of being fitted to the first fitting portion 10b. Is set to The second fitting portion 10d is provided with a bearing portion 10e that functions as a backlash removing means.

  With this configuration, the pressing force in the X direction in which the spherical member 16 (rolling member) presses the first guide shaft 12 (rotation restricting member) urges the moving frame 10 in the direction of the second guide shaft 13. Converted to the Y direction. At this time, the second guide shaft 13 abuts on the bearing portion 10e, so that the backlash generated between the second fitting portion 10d of the moving frame 10 and the second guide shaft 13 can be removed. .

  In addition, since the coiled spring is used as the biasing means 17 for pressing the spherical member 16 against the first guide shaft 12, the pressing force is adjusted by adjusting the biasing force of the biasing means 17. Easy to do.

  Since the second guide shaft 13 is received by the bearing portion 10e formed of a V-shaped concave portion, the friction load when the moving frame 10 moves back and forth in the direction of the optical axis O along the second guide shaft 13 is applied. This can be reduced as compared with the conventional one.

  Further, when the moving frame 10 moves back and forth along the second guide shaft 13, the friction load on the first guide shaft 12 side does not change. Therefore, the moving frame 10 can be moved back and forth more smoothly.

[Second Embodiment]
2, 3 and 4 are diagrams showing a second embodiment of the present invention. Among these, FIG. 2 is a perspective view showing a moving frame in the lens barrel of the present embodiment. 3 is a plan view when viewed from the direction of arrow A in FIG. FIG. 4 is an enlarged cross-sectional view of a main part taken along line [4]-[4] in FIG. 2 with respect to the sleeve in a state in which the second guide shaft is inserted in the present embodiment.

  The basic configuration of the present embodiment is substantially the same as the configuration of the first embodiment described above. In this embodiment, the structure of the bearing part which receives the 2nd guide shaft in the above-mentioned 1st Embodiment differs. Other configurations are substantially the same as those of the first embodiment described above. Accordingly, the same constituent members as those in the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and only different configurations will be described below.

  In the moving frame 10A in the lens barrel of the present embodiment, a cylindrical sleeve 18 is fitted to the second fitting portion 10d, and the second guide shaft 13 is fitted to the sleeve 18. ing. Two V-shaped bearing recesses 10 </ b> Ae are formed on the inner surface of the sleeve 18 to accommodate the spherical member 19 that is a rolling member.

  The sleeve 18 is formed with a through-hole 18a for forming the bearing recess 10Ae at a position facing the arrangement site of the bearing recess 10Ae (see FIG. 4).

  Further, the arrangement of the bearing recesses 10Ae at the two locations of the sleeve 18 is set as follows. That is, as shown in FIG. 4, the two bearing recesses 10 </ b> Ae have a surface E including a line B connecting the centers of the pair of spherical members 16 that press the first guide shaft 12. It arrange | positions so that it may become equal intervals in the position spaced apart from each other centering | focusing on the intersection F which cross | intersects the shaft center D (refer code | symbol G of FIG. 4). Other configurations are substantially the same as those in the first embodiment.

  Also in the second embodiment configured as described above, the urging means 17 has one of the pair of spherical members 16 directed toward the outer peripheral surface of the first guide shaft 12 as in the first embodiment described above. Press in the direction of arrow X in FIG. Then, the pair of spherical members 16 rolls along the outer peripheral surface of the first guide shaft 12, so that the moving frame 10 itself is in the direction of the arrow Y in FIG. Biased in the direction. At this time, on the second fitting portion 10 d side, the spherical member 19 housed and arranged in the bearing recess 10 </ b> Ae is pressed toward the outer peripheral surface of the second guide shaft 13. Here, in this embodiment, the two bearing recesses 10 </ b> Ae are arranged at equal intervals at positions spaced apart from each other across a surface including a line B connecting the centers of the pair of spherical members 16. Accordingly, when the moving frame 10 </ b> A is pressed toward the second guide shaft 13 by the urging means 17 pressing the pair of spherical members 16, a pressing component force is applied to the second guide shaft 13. It comes to join. Then, the play in the fitting between the second fitting portion 10d and the second guide shaft 13 is removed.

  As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained. In addition to this, in the present embodiment, a pressing component force is applied to the second guide shaft 13, and the spherical members 19 are disposed in the two bearing recesses 10Ae. The contact state between the shaft 13 and the second fitting portion 10d of the moving frame 10A can be made stable. Therefore, the moving frame 10A can smoothly move forward and backward in the direction of the optical axis O without looseness even if a loose fit occurs between the second guide shaft 13 and the second fitting portion 10d.

[Third Embodiment]
FIG. 5 is a plan view showing the moving frame in the lens barrel of the third embodiment of the present invention.

  The basic configuration of this embodiment is substantially the same as the configuration of the first and second embodiments described above. In this embodiment, the structure of the site | part which supports a 1st guide shaft (rotation restriction member) differs from the above-mentioned 1st, 2nd embodiment. Other configurations are substantially the same as those of the second embodiment described above. Therefore, the same components as those in the first and second embodiments described above are denoted by the same reference numerals, description thereof is omitted, and only different configurations will be described below.

  Also in the moving frame 10B in the lens barrel of the present embodiment, the first and second embodiments described above are provided in that the pair of spherical members 16 and the biasing means are disposed in the vicinity of the first fitting portion 10b. It is substantially the same as the form. In the present embodiment, the shape of the recesses (10Bbc, 10bc) for housing and arranging the pair of spherical members 16 and the form of the urging means for pressing the spherical member 16 are different.

  In the present embodiment, one of the recesses 10Bbc out of the recesses in which the pair of spherical members 16 are accommodated is formed to have a tapered recess. The other recess 10bc is formed in a shape substantially similar to that of the first and second embodiments described above. A plate-like spring as the biasing means 17B is disposed inside the other recess 10bc.

  The urging means 17B is an urging member that presses the spherical member 16 accommodated in the recess 10bc toward the outer peripheral surface of the first guide shaft 12. As the urging means 17B in the present embodiment, a plate-like spring member formed with a convex portion at a substantially central portion of the flat plate member is applied.

  On the other hand, the configuration of the second fitting portion 10d on which the second guide shaft 13 is fitted is the same as that of the above-described second embodiment. Other configurations are substantially the same as those of the first and second embodiments described above.

  Also in the third embodiment configured as described above, the biasing means 17B (plate spring in the present embodiment) is one of the pair of spherical members 16 in substantially the same manner as in the first and second embodiments described above. Is pressed in the direction of arrow X in FIG. 5 toward the outer peripheral surface of the first guide shaft 12. Accordingly, the pair of spherical members 16 urge the moving frame 10B toward the arrow Y direction in FIG. 5 (the direction of the second fitting portion 10d). Then, the spherical member 19 accommodated in the two bearing recesses 10 </ b> Ae is pressed toward the outer peripheral surface of the second guide shaft 13. The pressing force that urges the moving frame 10 </ b> B at this time is applied as a pressing component force to the second guide shaft 13 via the two spherical members 19. Thereby, the play in the fitting between the second fitting portion 10d and the second guide shaft 13 is removed.

  As described above, according to the third embodiment, substantially the same effect as that of the first embodiment can be obtained. In the present embodiment, a plate-like spring as the biasing means 17B is applied instead of the coiled spring as the biasing means 17 in the first and second embodiments described above. Thereby, in this embodiment, the arrangement space of the urging means 17B can be reduced.

[Fourth Embodiment]
6, 7 and 8 are views showing a fourth embodiment of the present invention. Among these, FIG. 6 is a perspective view showing a moving frame in the lens barrel of the present embodiment. 7 is a plan view when viewed from the direction of arrow A in FIG. FIG. 8 is an enlarged three-side view of the main part of the urging means for pressing the first guide shaft in the present embodiment.

  The basic configuration of the present embodiment is also substantially the same as the configuration of each of the above-described embodiments. In the present embodiment, the configuration of each part that respectively supports the first guide shaft (rotation restricting member) and the second guide shaft (guide member) is different from the above-described embodiments. Other configurations are substantially the same as the configurations of the above-described embodiments. Therefore, the same components as those in the above-described embodiments are denoted by the same reference numerals, description thereof is omitted, and only different configurations will be described below.

  In the moving frame 10C of the lens barrel of the present embodiment, the first fitting portion 10Cb that fits the first guide shaft 12 is provided so as to protrude outward from the outer periphery of the lens holding portion 10a. And a substantially L-shaped leaf spring member made of a spring material as a biasing means 17C that is disposed adjacent to the projection 10Cba and has a function as a biasing means. Yes. The leaf spring member has one end portion (one end surface 17Ca) as a fixed end that is a substantially L-shaped standing bent portion, and spring beam portions (17Cb, 17Cc) having a spring function connected to the end portion. The part is bent and formed in a substantially “<” shape.

  As shown in the trihedral view of FIG. 8, the urging unit 17C is configured such that one end surface 17Ca as a fixed end is fixed to the lens holding portion 10a by a fixing unit such as a screw or a screw. . Further, the spring beam portion of the urging means 17C has a protrusion 10Cba between the one end face 17Ca and the free end portion of the spring beam portion when viewed from the front in a state of being attached to the moving frame 10C. It is formed to have an inclined surface 17Cc having an inclination facing the wall surface.

  Then, as shown in FIG. 7, the first guide shaft 12 is fitted and disposed between the side wall surface 10Cbb of the projecting portion 10Cba and the inclined surface 17Cc of the urging means 17C. . In this case, the urging means 17C is set so as to press the first guide shaft 12 in the direction of the arrow H shown in FIG.

On the other hand, in the moving frame 10C, the other end side of the lens holding portion 10a is formed by a tapered groove extending in the direction along the optical axis O and having an opening toward the outside. A second fitting portion 10Cd to be fitted is formed.
On the other hand, in the moving frame 10C, the other end side of the lens holding portion 10a is formed by a V-shaped groove extending in the direction along the optical axis O and having an opening toward the outside. A second fitting portion 10 </ b> Cd that fits with the shaft 13 is formed.

  With this configuration, the moving frame 10C in the present embodiment includes the first guide shaft 12 that fits in the first fitting portion 10Cb, and the second guide shaft 13 that fits in the second fitting portion 10Cd. Is supported so as to be movable back and forth in the direction along the optical axis O. Other configurations are substantially the same as the configurations of the above-described embodiments.

  In the fourth embodiment configured as above, the leaf spring member as the urging means 17C presses the outer peripheral surface of the first guide shaft 12 in the direction of arrow H in FIG. As a result, the urging means 17C engages the first guide shaft 12 with the protruding portion 10Cba of the moving frame 10C, and at the same time, moves the moving frame 10C in the direction indicated by the arrow Y in FIG. Energize toward the joint portion 10Cd). At this time, the second guide shaft 13 is fitted in the V-shaped groove of the second fitting portion 10Cd. Therefore, the pressing force for urging the moving frame 10C at this time is received by the V-shaped groove of the second fitting portion 10Cd. Thereby, the play in the fitting between the second fitting portion 10Cd and the second guide shaft 13 is removed. That is, in the present embodiment, the tapered groove of the second fitting portion 10Cd functions as a backlash removing unit that removes backlash in the fitting between the second fitting portion 10Cd and the second guide shaft 13.

  As described above, according to the fourth embodiment, substantially the same effects as those of the above-described embodiments can be obtained. In the present embodiment, the urging means 17C that constitutes a part of the first fitting portion 10Cb is also configured as the urging means that presses the first guide shaft 12, so that it is simpler. The same effect can be obtained with a simple mechanism. In addition, since the number of members can be reduced, it is possible to reduce the manufacturing process and the manufacturing cost while contributing to downsizing.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and applications can of course be implemented without departing from the spirit of the invention. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the above-described embodiment, if the problem to be solved by the invention can be solved and the effect of the invention can be obtained, this constituent requirement is deleted. The configured structure can be extracted as an invention.

10, 10A, 10B, 10C: Moving frame 10a: Lens holding portion 10b, 10Cb: First fitting portion 10d, 10Cd: Second fitting portion 10e: Bearing portion 10Ae: Bearing concave portion 11 Optical lens 12 First guide shaft 13 Second guide shaft 14 Lead screw 15 Nut 16 Spherical member 17, 17B, 17C Biasing means 18 Sleeve 19 ... Spherical member 20a ... Fixing part

Claims (4)

In the lens barrel,
A moving frame that moves in the direction of the optical axis of the lens barrel;
A first guide shaft provided parallel to the optical axis of the lens barrel;
A second guide shaft provided in parallel with the first guide shaft;
A first fitting portion provided on the moving frame and fitted with the first guide shaft;
A second fitting portion provided on the moving frame and fitted with the second guide shaft;
An urging means provided at the first fitting portion for urging the moving frame in the direction of the second fitting portion;
A backlash removing means for removing backlash in the fitting between the second fitting portion and the second guide shaft provided in the second fitting portion;
A lens barrel characterized by comprising:   2. The lens barrel according to claim 1, wherein the urging means presses the first guide shaft by a leaf spring.   2. The lens barrel according to claim 1, wherein the urging means presses the first guide shaft by a pair of rolling members.   The lens barrel according to claim 1, wherein the moving frame holds a lens.

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