| 摘要 |
PURPOSE:To obtain an optical head which can increase the utilization efficiency of-light and detect with high accuracy the emission light amount of a semiconductor laser and a positional signal in the tracking direction of an objective lens with a simple and low-priced constitution. CONSTITUTION:In the optical head which irradiates an optical recording medium 6 with a laser beam from a semiconductor laser 1 which is displaceable at least in the tracking direction, reflection parts 5a, 10b for reflecting a part of a laser beam from the semiconductor laser 1 is provided in the objective lens 5 and its lens holder 10. There is provided in a light path between the semiconductor laser 1 and the objective lens 5 a semiconductor substrate 4 which has a mirror surface 4a for reflecting light from the semiconductor laser 1 and a light receiving part 4b having a light receiving area which is split into at least two parts in the tracking direction so as to receive reflected light from the reflection parts 5a, 10b. |
