Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1983-02-10
1985-02-05
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700, G11B 2100
Patent
active
044981597
ABSTRACT:
A track deviation detecting apparatus for detecting a deviation of a recording light spot (A) from a track (15) on a recording medium (7) comprises two diffraction gratings (2, 18) for producing two auxiliary spots (B1, C1) being led along light paths (30b1, 30c1), optical means comprising a light source (1), a collimator lens (17) and a condenser (6), and two optical detectors (20, 21) adapted to detect the respective reflected light rays from the auxiliary spots (B1, C1) on the recording medium (7). A positional relationship of two diffraction gratings (2, 18) and the optical means is arranged so that one of two auxiliary spots (B1, C1) is located on an unrecorded portion of the track (15) and at a lower edge (13) of the track (15), and the other is located on the unrecorded portion of the track (15) and at an upper edge of the track (15). The reflected light rays from two auxiliary spots (B1, C1) are led to the optical detectors (20, 21) installed correspondingly thereto, without being influenced by the record pits (16) formed by the spot of light (A). Thus, outputs from the optical detectors (20, 21) are differentially amplified by a differential amplifier (14) connected thereto, thereby making it possible to detect the amount and direction of the deviation of the spot of light (A) from the track (15) without being influenced by the record pits (16).
REFERENCES:
patent: 3971002 (1976-07-01), Bricot et al.
SPIE, vol. 329, (1982), pp. 8-20, Optical Disk Technology.
Mitsubishi Denki & Kabushiki Kaisha
Richardson Robert L.
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