| 摘要 |
PURPOSE:To make a structure simple and inexpensive and to improve durability by converting the pressure of liquid into the extending/contracting motion of a diaphragm and photodetecting light which is enlarged as compared with the momentum. CONSTITUTION:When the diaphragm 2 expands against the force of a disk spring 7 owing to variation in the pressure of the liquid in a pressure receiving chamber 3, a square rod 9 is strained concentrically by a prod 4 to deform elastically in a mountain shape. Then when one mirror surface of the square rod 9 is displaced by DELTAtheta because of the elastic deformation, the angle between a parallel light beam emitted by a light emitting element and a parallel light beam incident on a photodetecting element after being reflected twice by mirror surfaces is 4XDELTAtheta and the ratio of the output of the photodetecting element can be increased.
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