| 摘要 |
A light-sensing device comprises a light source consisting of a semiconductor laser (100), a light-transmitting optical system having a lens surface (12) and a diffraction grating surface (14) arranged on the optical axis of light emitted from this light source, and a light-receiving detection system (20) that detects any of the emitted light that is reflected from an object to be inspected. This emitted light is diffracted in at least two intersecting directions by the diffraction grating surface. <IMAGE> |
