| 摘要 |
PURPOSE:To prevent a skew detection error due to the contents of a record signal by reflecting the light given from a diffusing light source on a recording surface to form a real image of the light source on a 2-split photodetector set symmetrically to the light source via the same lens and using the difference output of the photodetector to control the skew. CONSTITUTION:The diffusing light delivered from the rectangular surface of a light emitting diode 9 provided within a housing 12 is irradiated to the recording surface of a disk 1. The reflected light forms a real image of the light source 9 on a 2-split photodetector 10 which is set symmetrically to the source 9 within a housing 12. Both the directon and the degree of the skew of the disk 1 is detected by the difference output of the photodetector 10. Then an optical pickup is controlled so that its optical axis is always vertical to the recording surface of the disk 1. This reproducer prevents a skew detection error due to the contents of a record signal. |
