Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1993-09-03
1995-02-28
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4424, 369 4429, 369 4431, 369 4438, 235456, G11B 709
Patent
active
053943856
ABSTRACT:
A beam-spot control unit is arranged such that a light beam is irradiated onto an optical recording medium having a plurality of tracks, through an objective lens, to detect reflecting light of beam spots formed on the tracks by three or more photo detecting elements which are arranged in a direction corresponding to a track transverse direction. From a tracking error signal which is generated by a difference signal of pairs of photo detecting elements which are selected by a selecting switch from these photo detecting elements, a control signal is generated which positions the beam spots to a plurality of recording lines within a single track. A tracking control mechanism is utilized to enable positioning of the beam spots to a plurality of recording lines within the single track to be performed.
REFERENCES:
patent: 4805162 (1989-02-01), Stahl et al.
patent: 4980882 (1990-12-01), Baer et al.
patent: 5027337 (1991-06-01), Takahashi et al.
patent: 5257249 (1993-10-01), Rokutan
Oshiba Mitsuo
Rokutan Takao
Sakurada Takefumi
Shirai Akira
Sugaya Takumi
Olympus Optical Co,. Ltd.
Young W. R.
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