| 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 the recording surface of a disk to form a real image of the light source on a 2-split detector and using the output of the detector to control an optical pickup so that it is vertical to the recording surface. CONSTITUTION:The light delivered from a lamp 10 is irradiated on the recording surface of a disk 1 through a quadrilateral diffusing plate 11, and the reflected light is condensed on a 2-split photodetector 15 via a condenser lens 16 of a photodetecting part 13. Thus a real image 18 of a diffusing light source 9 is formed. Both the direction and the degree of the skew of the disk 1 are detected based on the difference between the outputs of areas 15A and 15B of the photodetector 15. 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. |
