| 摘要 |
PURPOSE:To lead only a regular laser light to a detector, and to prevent stray light from being made incident to the detector by angling a stray light generating surface against an optical axis so that a reflected stray light from the stray light generating surface of a splitter is not inputted to the detector. CONSTITUTION:A stray light generating surface of a polarized beam splitter 1 for a video disk player is angled against optical axes X, Y. For instance, when a shape of the polarized beam splitter 1 is a rectangular, and the surface A is placed at 45 deg. against the optical axes X, Y, the surfaces B, C do not fall at right angles with the optical axes but have some angle, and stray light M1, M2 do not coincide with the optical axis Y, and are not made incident to a detector 4. In this way, it can be prevented that stray light is made incident to the detector 4, therefore, a deterioration of performance such as a deterioration of S/N ratio of a picture, etc. can be prevented. |
