JPH0733203Y2 - Dustproof device for lens barrel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a dustproof device between a lens barrel of a camera and a camera body.

[Conventional technology]

Conventionally, a configuration has been proposed in which an elastic member is arranged between the finder lens barrel and the lens barrel holding portion.

[Problems to be solved by the invention]

As an elastic member provided between the lens barrel and a front plate portion such as a cover adjacent to the lens barrel, if the elasticity is large, the lens barrel holding force is small, and if the elasticity is small, the two lenses are dimensionally different from each other. There is no room for changes, and the lens barrel for focus adjustment and diopter adjustment cannot be moved smoothly.

[Means for solving problems]

The present invention is loosely fitted to the front plate of the camera body and is in sliding contact with the lens barrel, so that the lens barrel can slide smoothly even if the dimension between the two shifts and the dustproof effect between the two can be achieved. ,
A lens barrel having a fixed portion fixed to the camera body and a moving portion movable in the optical axis direction, and a peripheral end portion of a hole for the lens barrel is close to the outer peripheral surface of the moving portion of the lens barrel. A front plate portion such as a camera body or a camera front cover that is provided as described above, and is disposed between the outer peripheral surface of the moving portion of the lens barrel and the peripheral end portion of the front plate portion. A sliding contact surface which is in sliding contact with the outer peripheral surface of the moving portion, and an outer peripheral surface of the moving portion of the lens barrel which is in sliding contact with the inner and outer plate surfaces in the vicinity of the peripheral end portion of the front plate portion and has a gap between the peripheral end surface. There is provided a dustproof device for a lens barrel including a floating ring made of a material having a small elasticity and having a concave portion for absorbing a gap between the front plate portion and a peripheral end portion of the front plate portion.

[Action]

In the lens barrel dustproof device according to the present invention, when the lens barrel moves in the optical axis direction to adjust the focus, etc., the sliding contact surface of the floating ring is in sliding contact with the lens mirror movement, and the concave portion sandwiches the front plate portion. In addition, the recess gap absorbs a gap between the peripheral end of the front plate and the outer peripheral surface of the lens barrel.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, 1 is a camera body, 2 is a lens mirror fixed to the camera body 1, 2a is a fixed portion, and 2b is an optical axis direction for focus adjustment. It is a moving part that moves to. Reference numeral 3 denotes a front plate portion such as a fixed front cover integrally formed with the camera body 1, and 3a denotes a peripheral end portion of a hole slightly larger than the outer periphery of the lens barrel. A floating ring 4 is provided between the sliding contact portion 4a which is in sliding contact with the outer peripheral surface of the lens barrel, and the peripheral end portion 3a of the front plate portion 3 which is in sliding contact with the plate surface in a U-shape and which is between the peripheral end portion. It is provided with a recess 4b having a minute gap and is made of ABS resin or the like having a small elasticity. 5 is a battery, 6 is a motor,
Reference numeral 7 is an illumination unit such as a flash unit.

Next, the operation will be described. The distance between the lens barrel 2 and the peripheral end 3a of the front plate 3 changes due to variations in both members, mounting, and thermal expansion. Moreover, when the moving portion 2b of the lens barrel moves in the direction of arrow AB in the figure for focus adjustment or the like, and when the material is plastic, these changes become even greater. First, the lens barrel 2 and the floating ring 4
The sliding between the sliding contact portion 4a and the sliding contact portion 4a will be described. The dimensional change of the outer circumference of the lens barrel 2 is absorbed by the change of the inner circumference dimension due to the elasticity of the floating ring 4.

Next, the variation in the distance between the outer peripheral surface of the lens barrel 2 and the peripheral end portion 3a of the front plate portion 3 is absorbed by the recess 4b of the floating ring 4.

The device of the present invention can be applied to a lens barrel of a camera such as a still camera, a cine camera, a video camera or the like, and can also be applied to a photographing lens, a finder lens or other lenses in the same manner as this embodiment. In the case of the viewfinder eyepiece, it is clear that the plate on the rear surface of the camera corresponds to the front plate portion.

[Effect of device]

According to the present invention, even if the dimensions of the lens barrel and the plate portion of the camera and the distance between the two surfaces change, the gap between the lens barrel and the camera plate portion is blocked so that the eccentricity is not noticeable in appearance, and the lens is protected. Smooth the movement of the lens barrel.

[Brief description of drawings]

 FIG. 1 is a schematic partial sectional view showing an embodiment of the present invention. 1 ... Camera body 2 ... Lens barrel 3 ... Front plate 4 ... Floating ring

Front page continuation (72) Inventor Masao Tsujimura 6-27-8 Jingumae, Shibuya-ku, Tokyo Kyocera Corp. Tokyo Harajuku Office Examiner Shuji Omoto (56) References JP 54-2117 (JP, SHO) A) Actual opening 60-84930 (JP, U) Actual opening 61-148041 (JP, U) Actual opening 54-146226 (JP, U) Actual opening 63-177829 (JP, U) Actual opening Sho 58 -23323 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A lens barrel having a fixed portion fixed to a camera body and a moving portion movable in the optical axis direction, and a peripheral end portion of a hole for the lens barrel has a moving portion of the lens barrel. A front plate portion such as a camera main body or a camera front cover that is provided so as to be close to the outer peripheral surface, and is arranged between a moving portion outer peripheral surface of the lens barrel and a peripheral end portion of the front plate portion, There is a gap between a sliding contact surface which is in sliding contact with the outer peripheral surface of the moving portion of the lens barrel, and inner and outer plate surfaces near the peripheral end portion of the front plate portion, and there is a gap between the peripheral end surface of the lens barrel. A dust-proof device for a lens barrel, comprising: a floating ring having a concave portion for absorbing a gap between the outer peripheral surface of the moving portion and the peripheral end portion of the front plate portion.