Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-04-11
1998-05-05
Grimm, Siegfried H.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
331 75, 331117R, 369121, G11B 700, H03B 512
Patent
active
057485780
ABSTRACT:
A Colpitts type oscillator circuit for mitigating the effects of undesired oscillator ringing when write pulses are supplied, such as those encountered in compact disc, laser disc, and magneto-optical players or recording devices. Circuit elements are provided for mitigating the effects of oscillator ringing including replacement of an inductor with a suitable resistive load and an oscillator supply voltage maintained above a predetermined minimum voltage which is a function of the specific values of the related circuit elements. An improved optical disc system also includes the present Colpitts type oscillator in combination with an optical assembly, a laser light source, an objective lens subassembly, an objective lens, an actuator assembly, a photodetector, first and second servomotors, a source of write pulses, a first electronic circuit for controlling the servomotors, a motor for moving a respective disc, a second electronic circuit for decoding, a third electronic circuit for enabling the laser light source, a voltage supply for the oscillator, a data receiver, a data encoder, a magnetic field generator, a cartridge loading assembly for removably positioning the respective disc, and a servo error circuit for determining when light returning from the disc exceeds a predetermined value.
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Bollella Donald
Braun Robert T.
Clark Ronald J.
Discovision Associates
Grimm Siegfried H.
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