Patent ID: 6085038
Filing Date: 2000-07-04
Classification: G03B

Abstract:
An operation apparatus for a water proof device, comprising:an operation member which is rotatably supported on an outer surface of a water tight casing of said water proof device;a water tight transparent window formed in the portion of the casing that is covered by the operation member;a photocoupler having a light emitter and light receiver, said photocoupler provided inside the transparent window; anda reflection code pattern provided on the surface of the operation member that is opposed to the transparent window, said reflection code pattern being provided with different amounts of reflectance for light emitted from the light emitter of the photocoupler, wherein the amount of light to be received by the light receiver of the photocoupler can be varied in accordance with the operation position of the operation member, said photocoupler comprising a plurality of photocouplers provided inside the transparent window and positioned with respect to each other along a direction perpendicular to a tangent to the direction of rotational movement of the operation member, and said reflection code pattern comprising a plurality of reflection code patterns corresponding to the plurality photocouplers.