| 摘要 |
A lens barrier device comprises an adaptor body capable of being removably attached chiefly on a taking lens frame, a lens barrier member capable of movement to a closed position covering the taking lens and an open position withdrawn from the front thereof, being rotatably attached to the adaptor body, and an engagement member capable of engagement with the filter screwthread of the lens frame. If the lens barrier member in the open position is rotated excessively by wrong manual operation, the edge of the lens barrier member presses on the engagement member, releasing the engagement with the filter screwthread and so separating the adaptor body from the lens frame, thereby protecting the lens barrier device.
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