Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-11-28
1992-09-22
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
051503484
ABSTRACT:
An optical head is disclosed for detecting a tracking error on a recording medium by the reflected beam from the recording medium obtained by irradiating a beam on the recording medium. The optical head splits a light path of the reflected beam into two light paths wherein a first photo detector arranged before the focal point of the reflected beam in one light path having a light receiving area split into at least two parts detects the reflected beam in one light path, a second photo detector arranged beyond the focal point of the reflected light in the other light path having a light receiving area split into at least two parts detects the reflected beam in the other light path, and a control signal for tracking is generated by adding the output of the first photo detector to the output of the second photo detector. In this control signal for tracking occurs no offset even when an objective lens moves in the diametric direction of the recording medium and shifts the light path of the reflected beam.
REFERENCES:
patent: 4363961 (1982-12-01), Okada et al.
patent: 4742218 (1988-05-01), Nakamura et al.
patent: 4775968 (1988-10-01), Ohsato
patent: 4987292 (1991-01-01), Howard
Mitsubishi Denki & Kabushiki Kaisha
Richardson Robert L.
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