Title:
INFORMATION REPRODUCING METHOD AND PHOTODETECTOR
Document Type and Number:
Japanese Patent JP3267748
Kind Code:
B2
Abstract:
PURPOSE: To suppress deviation of a position and the influence of an adjacent information pit and to perform accurate information reproducing by outputting a photo-detected signal based on the reflected light corresponding to a region of an outer peripheral side and reproducing recorded information based on the photo-detected signal.
CONSTITUTION: A system controller 14 controls a digital signal processing circuit 34, a tracking driving circuit 37 and a laser output control circuit 39 based on a command and the like from an input display section 15, and gives and receives data to/from a storage section 16. In this case, the direction of a dividing line X-X of an eight partition photodetector 30 is parallel with the circumferential direction of a disk, and an optical system is constituted so that a laser beam is made incident making to coincide the center of a spot of reflected light with the center point of the eight partition photodetector when the center line of any track is irradiated with a laser beam from an object lens in the center of a laser spot. Thereby deviation of a position and the influence of an adjacent information pit can be suppressed and accurate information reproducing can be performed.
Inventors:
Mitsuru Sato
Hiroyuki Nakashima
Hiroyuki Nakashima
Application Number:
JP13769093A
Publication Date:
March 25, 2002
Filing Date:
June 08, 1993
Export Citation:
Assignee:
Pioneer Corporation
International Classes:
G11B7/00; G11B7/005; G11B7/013; G11B7/13; (IPC1-7): G11B7/005; G11B7/135
Domestic Patent References:
| JP2267733A | ||||
| JP536072A |
Attorney, Agent or Firm:
Yasuo Ishikawa
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