| 摘要 |
A support block (20) and a guide member (22) having a seat (24) to carry a watch (25) to be examined are attached to a post (18) at a vertical space from each other, the post being set up inside an airtight container (10) which is pressurized or decompressed. A light emitting element (31) and a light receiving element (32) are embedded in the support block (20) so as to face each other with a vertical gap (28) inbetween. Inside a cavity (29) adjoining the gap in the block, there are a screening plate (38) vertically projected in the gap and a contact member (39) solidly fixed to the plate. In a test, a needle-shaped bottom end portion of the contact member is brought in contact with the watch to be examined, the screening plate is moved by a distortion of the watch accompanying a change of the pressure inside the container, thereby restricting a luminous flux from the light emitting element, and the change of the luminous flux is converted into a change of photoelectric current and displayed visually. |
