| 摘要 |
An operation apparatus for a water proof device includes an operation member which is rotatably or slidably supported on an outer surface of a water tight casing of a water proof device, a water tight transparent window formed in the casing that is covered by the operation member, a reflection type photocoupler provided inside the transparent window, and a reflection code pattern provided on the surface of the operation member that is opposed to the transparent window. The reflection code pattern is provided with different reflectances for light emitted from the light emitter of the photocoupler, so that 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.
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