| 摘要 |
An optical deflection angle measuring apparatus which, upon optically measuring a deflection angle, does not require an operation for directing a light onto a position detecting element and makes it possible to obtain measurement results without being affected by external force such as vibrations. A detector 410 is constructed with a common lens 411 for converging diffuse lights from light sources 41,42. Position detecting elements 412-2,412-1 receive the thus-converged lights from the light sources 41,42 and detect received positions of the converged lights. Reflecting prisms 413-1,413-2 allow the diffuse lights from the light sources 41,42 to be transmitted and guided so that the diffuse lights from the light sources 42,41, are converged, by the lens 411, onto the position detecting elements 412-1,412-2. The respective position detecting elements are arranged so as not to interfere with the convergence of the lights by the lens 411. The deflection angle PHI can then be measured by computation.
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