| 摘要 |
PURPOSE:To prevent the lowering of coupling efficiency of an objective lens by arranging a light emitting element so that the optical axes of outgoing lights are parallel with each other reflecting the light from the light emitting element with the reflection surface of a reflection mirror and irradiating the objective lens with this light. CONSTITUTION:A light 22 reflected by an optical card 1 is again transmitted through an objective lens 18, wavelength selection film 31 and projected on a reflection mirror 17. The light 22 reflected by the reflection mirror 17 is reflected by a beam splitter 16, converged by a collimator lens 19 and projected on a light receiving element 20. In such a recording/reproducing operation, since the reflection mirror 17, the wavelength selection film 31 and the objective lens 18 provided together on a movable member move simultaneously along the tracing direction (track 3), the incident angle of the light 21 to the moving wavelength selection film 31 does not change and continuous information recording/reproducing is performed. |
