Title:
OPTICAL PICKUP DEVICE
Document Type and Number:
Japanese Patent JP3879897
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an optical pickup device which is hardly influenced by a truck crossing noise or an optical disk thickness error, in which both a 3-beam mode and a DPD mode can be used and which is unaffected by an optical axis deviation.
SOLUTION: The optical pickup device is provided with: an optical element for detecting a focal error which has four divided regions of the first quadrant to the fourth quadrant divided by two parting lines which extend in the extension direction of a truck and in the direction perpendicular to the extension direction on the plane perpendicular to the optical path of a return light beam and which splits the return light beam into at least four light beams while imparting astigmatism in the direction rotated mutually by 90 degrees around the optical path to the return light beam which passes through the adjacent regions of the same side divided by the parting line; a photodetector which has a contour corresponding to the parting line in the image surface where the light beam becomes circular, and which has a light receiving element consisting of two light-receiving regions divided by a by-parting line extended approximately parallel to one of the contours; and sub-light receiving elements disposed adjacently, to respective light-receiving regions along the contour corresponding to the parting line of the light receiving element.
Inventors:
Masakazu Ogasawara
Ichi Koyanagi
Ichi Koyanagi
Application Number:
JP2000272091A
Publication Date:
February 14, 2007
Filing Date:
September 07, 2000
Export Citation:
Assignee:
Pioneer Corporation
International Classes:
G02B3/00; G11B7/09; G02B3/06; G11B7/13; G11B7/135; (IPC1-7): G11B7/09; G02B3/00; G02B3/06; G11B7/13; G11B7/135
Domestic Patent References:
| JP2276027A | ||||
| JP7141667A | ||||
| JP1102742A | ||||
| JP62277635A |
Attorney, Agent or Firm:
Motohiko Fujimura