JP2009053493A - Lens barrel and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel for easily removing the backlash in an optical axis direction and to provide a camera. <P>SOLUTION: The lens barrel includes a rotatable operating ring (FR), and mechanical parts (10, 20) disposed at both ends of the operating ring (FR) in a first direction. At least either the operating ring (FR) or the mechanical parts (10, 20) has a pair of moving members relatively movable in the first direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens barrel and a camera.

  Conventionally, an operation member that rotates about the optical axis, a first fixed tube that contacts the operation member, a second fixed tube that is disposed at a position sandwiching the operation member together with the first fixed tube, and substantially parallel to the optical axis There is known a lens barrel that includes an adjustment screw that is screwed with a second fixed cylinder in a direction and abuts against an operation member (see the following patent document).

  By adjusting the rotation of the adjustment screw, the play of the operation member in the optical axis direction can be adjusted.

Since the play of the operation member in the optical axis direction can be adjusted, the user can smoothly rotate the operation member, and a good operation feeling can be obtained.
JP 2002-55267 A

  However, in order to remove the play in the optical axis direction of the operation member, it is necessary to tighten the three adjustment screws evenly.

  An object of the present invention is to provide a lens barrel and a camera that can easily remove play in the optical axis direction.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a lens barrel including a rotatable operation ring and mechanical parts provided at both ends of the operation ring along a first direction. And at least one of the mechanical parts has a pair of moving members relatively movable along the first direction.

  According to a second aspect of the present invention, in the lens barrel according to the first aspect, the operation ring includes the moving member.

  According to a third aspect of the present invention, in the lens barrel according to the first aspect, the mechanical component has the moving member.

  According to a fourth aspect of the present invention, in the lens barrel according to the first to third aspects, the pair of moving members are screw-coupled.

  According to a fifth aspect of the present invention, in the lens barrel according to the first to fourth aspects, an adhesive tape is attached to the outer peripheral surfaces of the pair of moving members.

  A sixth aspect of the present invention is a camera comprising the barrel according to any one of the first to fifth aspects and a camera body to which the barrel is mounted.

  According to this invention, the play in the optical axis direction can be easily removed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a conceptual diagram showing a cross section of a lens barrel according to an embodiment of the present invention.

  The lens barrel 1 includes an operation ring FR, a first fixed cylinder (mechanical part) 20, a second fixed cylinder (mechanical part) 10, and a lens holding frame 30.

  The operation ring FR is an annular operation member for performing focusing by rotating around the optical axis L by hand from the outside. The operation ring FR is fitted to the first fixed cylinder 20 so as to rotate around the optical axis L without moving in the optical axis L direction (first direction). The second fixed cylinder 10 is fixed to the first fixed cylinder 20 with screws 11. The operation ring FR may be made of metal or plastic.

  A mount 20 a for mounting on a mount (not shown) of the camera body 90 is provided at the rear end portion of the first fixed cylinder 20. A cam groove 21 is formed in the first fixed cylinder 20 so that the operation ring FR can rotate by a predetermined angle around the optical axis L.

  The second fixed cylinder 10 holds a fixed lens 10G. The fixed lens 10 </ b> G is fixed to the second fixed cylinder 10 by a pressing ring 13. The retaining ring 13 is a ring-shaped screw member having a screw 13a formed on the outer peripheral surface. The male screw 13a is formed on the inner peripheral surface of the second fixed cylinder 10 and is therefore screwed into the screw 10a.

  The operation ring FR includes a first operation ring 40 and a second operation ring 50. The first operating ring 40 and the second operating ring 50 constitute a pair of moving members. The male screw 51 formed at the rear end portion of the second operation ring 50 and the screw 41 formed at the front end portion of the first operation ring 40 are screwed together. The length of the operation ring FR in the optical axis L direction is adjusted by changing the screwing amount of the male screw 51 of the second operation ring 50 and the female screw 41 of the first operation ring 40. An adhesive tape 61 is bonded to the outer peripheral surface FRb of the operation ring FR so as to cover the screwed portion between the first operation ring 40 and the second operation ring 50. A rubber ring 60 is attached to the outer peripheral surface FRb of the operation ring FR via an adhesive tape 61.

  The first operation ring 40 is formed with a rectilinear groove 42 extending along the optical axis L direction and crossing the cam groove 21. The width of the rectilinear groove 42 is the same as the width of the cam groove 21.

  The lens holding frame 30 is provided on the inner peripheral surface 22 of the first fixed cylinder 20 so as to be slidable in the optical axis L direction. The lens holding frame 30 holds the focusing lens 30G.

  Since it is formed on the outer peripheral surface of the lens holding frame 30, the screw portion 70c of the driving pin 70 for focusing is screwed into the screw 30c. The head 70 b of the drive pin 70 reaches the rectilinear groove 42 through the cam groove 21 and is slidably engaged with both grooves 42, 21.

  Next, the assembly procedure of the lens barrel 1 will be described.

  First, the male screw 51 of the second operation ring 50 and the female screw 41 of the first operation ring 40 are screwed together to assemble the operation ring FR. After setting the length of the operation ring FR in the optical axis L direction to a predetermined length, the operation ring FR is mounted on the outer peripheral surface 23 of the first fixed cylinder 20.

  Next, the lens holding frame 30 is attached to the inner peripheral surface 22 of the first fixed cylinder 20.

  Thereafter, the cam groove 21 and the rectilinear groove 42 are aligned, the drive pin 70 is inserted into the cam groove 21 and the rectilinear groove 42, and the screw portion 70 c of the drive pin 70 is screwed into the female screw 30 c of the lens holding frame 30.

  Next, the second fixed cylinder 10 is fixed to the first fixed cylinder 20 with screws 11.

  Thereafter, the fixed lens 10 </ b> G is attached to the second fixed cylinder 10, and the fixed lens 10 </ b> G is fixed to the second fixed cylinder 10 with the holding ring 13.

  Next, for example, the first operation ring 40 is pressed to rotate the second operation ring 50, and the wall surface 15 of the second operation ring 50 and the second wall surface 25 of the second fixed tube 10 are moved to the wall surface 15 of the second fixed tube 10 and the wall surface 25 of the first fixed tube 20. The wall surfaces 45 of the one operation ring 40 are brought into contact with each other. The distance from the wall surface 55 of the second operation ring 50 to the wall surface 45 of the first operation ring 40 is extended, and the play in the optical axis L direction of the operation ring FR is eliminated.

  Thereafter, the adhesive tape 61 is wound around the outer peripheral surface of the operation ring FR so that the screwed state between the first operation ring 40 and the second operation ring 50 is not loosened. Note that the first operation ring 40 and the second operation ring 50 may be fixed with an adhesive instead of the adhesive tape 61.

  After the first operating ring 40 and the second operating ring 50 are fixed with the adhesive tape 61, the rubber ring 60 is mounted on the outer peripheral surface FRb of the operating ring FR. The rubber ring 60 plays a role of preventing slipping when the operation ring FR is rotated by hand.

  The assembly of the lens barrel 1 is completed through the above procedure.

  Next, the operation of the lens barrel 1 will be described.

  First, the rubber ring 60 is rotated by hand. Since the operation ring FR and the rubber ring 60 are integrally coupled, the operation ring FR rotates integrally with the rubber ring 60. Since the drive pin 70 fixed to the lens holding frame 30 is slidably engaged with the rectilinear groove 42 and the cam groove 21, the lens holding frame 30 is rotated when the operation ring FR rotates around the optical axis L. While moving integrally with the operating ring FR by the rectilinear groove 42, the lens moves in the direction of the optical axis L along the cam groove 21 together with the focusing lens 30G to perform focusing.

  According to this embodiment, the length of the operation ring FR in the direction of the optical axis L can be changed simply by rotating the first operation ring 40 or the second operation ring 50 about the optical axis L. The play in the optical axis L direction of the ring FR can be removed, and a good operational feeling can be obtained.

  In the above embodiment, the present invention is applied to a lens barrel that holds a focusing lens, but may be applied to a lens barrel that holds a zoom lens.

  In the above embodiment, the operation ring FR is constituted by the first operation ring 40 and the second operation ring 50 that can be screw-coupled, and the optical axis of the operation ring FR is changed by changing the screwing amount of both operation rings 40 and 50. Although the play in the L direction is removed, as another embodiment, the second fixed cylinder 10 is not fixed to the first fixed cylinder 20 with the screw 11 and the both 10 and 20 are coupled with screws (not shown), for example, the second The play in the direction of the optical axis L of the operation ring FR may be removed by rotating the fixed cylinder 10 about the optical axis L to change the screwing amount between the second fixed cylinder 10 and the first fixed cylinder 20. . In this case, the second fixed cylinder 10 and the first fixed cylinder 20 constitute a pair of moving members, and the operation ring FR needs to be divided into the first operation ring 40 and the second operation ring 50 as in the above embodiment. There is no.

FIG. 1 is a conceptual diagram showing a cross section of a lens barrel according to an embodiment of the present invention.

Explanation of symbols

  1: lens barrel, 10: second fixed cylinder (mechanical part), 20: first fixed cylinder (mechanical part), 40, 50: annular member, 61: adhesive tape, 90: camera body, FR: operation ring.

Claims (6)

A rotatable control ring,
In a lens barrel provided with mechanical parts provided at both ends of the operation ring along a first direction,
At least one of the operation ring and the mechanical part includes a pair of moving members that are relatively movable along the first direction.   The lens barrel according to claim 1, wherein the operation ring includes the moving member.   The lens barrel according to claim 1, wherein the mechanical part has the moving member.   The lens barrel according to claim 1, wherein the pair of moving members are screwed together.   The lens barrel according to claim 1, wherein an adhesive tape is attached to the outer peripheral surfaces of the pair of moving members.   A camera comprising the lens barrel according to any one of claims 1 to 5 and a camera body to which the lens barrel is mounted.

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