JPH0669919U - Lens barrel - Google Patents

Abstract

(57) [Abstract] [Purpose] Even when the operating ring is rotatable around the optical axis and / or movable along the optical axis, the operating force of the operating ring can be adjusted. An operating force applying member for applying an operating force to the operating ring 12 provided on the outer peripheral surface 11a of the fixed barrel 11 so as to be rotatable around the optical axis and / or movable in the optical axis direction. 13 and an operating force adjusting member 1 for adjusting the operating force thereof
4 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens barrel capable of adjusting the operating force of an operating ring.

[0002]

[Prior art]

 Conventionally, this type of lens barrel is provided with an operating force adjusting mechanism that adjusts the rotational torque (operating force) of the operating ring by changing the pressure contact force of the operating ring to the fixed lens barrel. As such an actuating force adjusting mechanism, a mechanism as disclosed in JP-A-60-241006 has been proposed. FIG. 3 is a diagram showing the structure of the lens barrel according to the above publication. An operation ring 2 is rotatably fitted on the outer side of the fixed barrel 1. Further, the fixed barrel 1 is provided with a screw portion 1a, and the screw portion 3a provided inside the rotation torque adjusting member 3 is screwed into the screw portion 1a. Therefore, the rotation torque adjusting member 3 is rotatable relative to the fixed barrel 1. An elastic member 4 such as a wave washer is inserted between the rotation torque adjusting member 3 and the operating ring 2, and the operating ring 2 is urged by the elastic member 4 to give a required working force. . The rotating torque adjusting member 3 can be positioned and fixed to the fixed lens barrel 1 in the direction of the optical axis 10 with screws 5.

Since the conventional lens barrel is configured as described above, the rotation torque adjusting member 3 is relatively rotated with respect to the fixed lens barrel 1, and the elastic member 4 is attached to the operation ring 2. The rotational torque of the operating ring 2 can be adjusted by changing the power.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, the rotational torque adjusting member 3 is screwed onto the fixed lens barrel 1, and the relative rotation of the two causes the elastic member 4 to apply the urging force to the operating ring 2 in the thrust direction. Therefore, there is a problem that the operation ring moves in the direction of the optical axis 10 and cannot be used for a so-called one-operation type zoom lens barrel.

An object of the present invention is to provide a lens barrel capable of adjusting the operating force of the operating ring even when the operating ring is rotatable around the optical axis and / or movable along the optical axis. It is to provide.

[0006]

[Means for Solving the Problems]

 The present invention solves the above problems by the following means. It should be noted that, in order to facilitate understanding, reference numerals corresponding to the embodiments will be given and described, but the present invention is not limited to these. That is, the first solution means of the lens barrel according to the present invention is a fixed lens barrel (11) and a lens barrel that is rotatable around the optical axis and / or movable in the optical axis direction on the outer peripheral surface (11a) of the fixed lens barrel. An operating ring (12) provided on the operating ring, an operating force applying member (13) provided on the operating ring and applying an operating force to the operating ring, and an operating force applying member provided on the operating ring. And an operating force adjusting member (14) for adjusting power.

In the second solution means, the operating force imparting member (13) is provided inside the operating ring, and the operating force adjusting member (14) is rotatably provided on the operating ring. It is characterized in that it has a cam portion (14a) in its inner diameter portion, which comes into contact with the actuation force applying member to adjust the actuation force.

In the third solution means, a rotation suppressing means (CL) provided between the operating ring (12) and the operating force adjusting member (14) for suppressing the rotation of the operating force adjusting member is attached. It is characterized by the addition.

In a fourth solution means, a sliding contact member is provided at a portion of the actuating force applying member (13) facing the outer peripheral surface of the fixed lens barrel (11) and is in sliding contact with the outer peripheral surface of the fixed lens barrel. (16) is added.

[0010]

[Action]

 According to the first solving means, since the operating force applying member and the operating force adjusting member, which are the components for adjusting the operating force of the operating ring, are provided on the operating ring, the operating ring only rotates about the optical axis. Not only when performing the operation, but also when the operating ring moves in the optical axis direction and rotates around the optical axis, it is possible to apply the operating force to the operating ring and adjust the operating force. .

According to the second solving means, the operating force adjusting member has the cam portion, and since the cam portion is in contact with the operating force applying member, the operating force applying member is applied by the rotation of the operating force adjusting member. The pressure contact force of the member to the outer peripheral surface of the fixed lens barrel can be changed.

According to the third solving means, since the rotation suppressing means is provided between the operating ring and the operating force adjusting member, it is possible to prevent the operating force adjusting member from rotating unintentionally.

According to the fourth solving means, since the sliding contact member is provided on the surface of the operation ring facing the outer peripheral surface of the fixed lens barrel, the frictional force with respect to the fixed lens barrel can be adjusted.

[0014]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to the drawings and the like. 1 and 2 are views showing an embodiment of a lens barrel according to the present invention. FIG. 1 is a partial cross-sectional view of the vicinity of an operating ring, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. is there. In the lens barrel of this embodiment, the operation ring 12 is slidably fitted to the outer peripheral surface 11a of the fixed lens barrel 11, and an optical system drive mechanism in the fixed lens barrel 11 is provided by an interlocking member (not shown). (Shown). This lens barrel performs zooming by moving the operation ring 12 in the direction of the optical axis 20, and performs focusing by rotating the operation ring 12 about the optical axis 20, so-called one-operation zoom. It is a lens barrel.

One end 13 a of the spring member 13 is fixed to the inner peripheral surface 12 a of the operation ring 12 with a screw 15. The spring member 13 is a member for applying an operating force to the operation ring 12, and a leaf spring or the like is used. The free end 13b of the spring member 13 is biased in the direction of arrow B in the figure, that is, in the direction away from the optical axis 20. Further, the spring member 13 has a sliding contact member 16 such as suede or rubber adhered to the surface of the free end 13b facing the inner peripheral surface 11a of the fixed lens barrel 11. The sliding contact member 16 provides a proper frictional force with the inner peripheral surface 11a of the fixed barrel 11, prevents the inner peripheral surface 11a from being scratched, and gives a smooth operation feeling.

The operating force adjusting ring 14 is a member for adjusting the operating force of the operating ring 12, and is rotatably provided on the operating ring 12. A cam portion 14a as shown in FIG. 2 is provided on the inner diameter portion of the operating force adjusting ring 14, and the cam portion 14a is in contact with the free end 13b of the spring member 13. Further, a plurality of grooves 14c are provided on the rear end surface 14b of the operating force adjusting ring 14 as shown in FIG. 2, and one groove is provided on the facing surface 12b on the operating ring 12 shown in FIG. A so-called click mechanism CL is configured with the steel ball 18 fitted through the coil spring 17 in the bore 12c.

Since the lens barrel of this embodiment is configured as described above, when the photographer rotates the actuating force adjusting ring 14 with respect to the operation ring 12 in accordance with the photographing situation, preference, etc., The pressure contact force of the spring member 13 with respect to the fixed lens barrel 11 changes, and a required operating force can be applied to the operation ring 12. That is, as is apparent from FIG. 2, the fixed lens barrel 11 is formed by the sliding contact member 16 adhered to the free end 13b of the spring member 13 by the action of the cam portion 14a that rotates the operating force adjusting ring 14 to the right. The pressure contact force to the outer peripheral surface 11a is increased, and the operation force of the operation ring 12 is increased. On the contrary, when the operating force adjusting ring 14 is rotated counterclockwise, the pressure contact force of the sliding contact member 16 against the outer peripheral surface 11a of the fixed lens barrel 11 decreases, and the operating force of the operating ring 12 decreases.

When zooming is performed, the operating ring 12 is moved in the direction of the optical axis 20, and when focusing is performed, the operation ring 12 is rotated about the optical axis 20, but in any operation, The above-mentioned operating force can be applied. At this time, since the operating force adjusting ring 14 is locked by the click mechanism CL described above, the operating force does not rotate carelessly from the set position, and the operating force set during operation does not change.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also included in the present invention. For example, the spring member 13 may be integrally resin-molded with the operation ring 12. Further, the spring member 13 and the cam portion 14a may be provided at a plurality of positions with their angular positions shifted. Further, the spring member 13 is a cantilever-supported leaf spring as an example, but it may be in the form of both-end support having a curved center, or may be a coil spring or the like protruding in a direction orthogonal to the optical axis 20. Good. The actuating force adjusting ring 14 has been described with reference to the example in which the actuating force is adjusted by the cam portion 14a. Although the click mechanism CL has been described as an example of the rotation suppressing means, a lock mechanism utilizing friction or engagement of the convex member and the concave member may be provided.

[0020]

[Effect of device]

 As described in detail above, according to claim 1, since the operating force applying member and the operating force adjusting member are provided on the operation ring, when the operation ring only rotates about the optical axis, the operation ring is lighted. In both cases of moving in the axial direction and rotating about the optical axis, it is possible to apply and adjust the operating force, and it can be used for a one-operation zoom lens barrel and the like.

According to the second aspect of the present invention, the actuating force adjusting member is rotated and the cam portion changes the pressure contact force of the actuating force applying member to the outer peripheral surface of the fixed lens barrel, so that the actuating force of the operating ring is adjusted. Can be performed finely with a simple operation.

According to the third aspect, since the rotation suppressing means is provided between the operating ring and the actuation force adjusting member, it is possible to suppress the inadvertent rotation of the actuation force adjusting member, and the set operation is performed. Power will never change.

According to the fourth aspect, since the sliding contact member is provided on the surface of the operation ring facing the outer peripheral surface of the fixed lens barrel, the frictional force with respect to the fixed lens barrel is adjusted to obtain a smooth operational feeling. You can

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing the vicinity of an operating ring of an embodiment of a lens barrel according to the present invention.

2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partial cross-sectional view showing the vicinity of an operating ring of a conventional lens barrel.

[Explanation of symbols]

 11 Fixed lens barrel 12 Operation ring 13 Spring member 14 Actuating force adjusting ring 14a Cam part 16 Sliding contact member

Claims (4)

[Scope of utility model registration request] 1. A fixed lens barrel, an operation ring provided on an outer peripheral surface of the fixed lens barrel so as to be rotatable about an optical axis and / or movable in the optical axis direction, and an operation ring provided on the operation ring. A lens barrel including an actuating force imparting member that imparts an actuating force to a ring, and an actuating force adjusting member that is provided in the operation ring and adjusts the actuating force of the actuating force imparting member. 2. The operating force imparting member is provided inside the operating ring, the operating force adjusting member is rotatably disposed on the operating ring, and the inner diameter portion of the operating force adjusting member contacts the operating force imparting member. The lens barrel according to claim 1, further comprising a cam portion that comes into contact with the lens and adjusts its operating force. 3. The rotation suppressing means, which is provided between the operating ring and the actuating force adjusting member and suppresses the rotation of the actuating force adjusting member, is added. The lens barrel described. 4. A sliding contact member, which is provided at a portion of the actuating force applying member facing the outer peripheral surface of the fixed lens barrel and is in slidable contact with the outer peripheral surface of the fixed lens barrel, is added. ~ The lens barrel according to claim 3.