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Self-timing optic lathe
| Details |
Inventors: Dewar, Stephen W.; Breyfogle, Marvin G.;
Assignee:
Primary Examiner: Chin; Tommy P.
Assistant Examiner: Truong; Khoi
Attorney, Agent or Firm: McCollom; Alan T.
A self-timing optic lathe, comprising a turntable for rotating an object disc, an offset code track carried by the turntable and embodying an encoded control signal, a read laser for optically reading the encoded control signal from the code track, a write laser for optically recording an information signal on the object disc, an optical carriage for moving the write laser and the read laser in a radial direction across the turntable relative to the code track, and a timing and control circuit connected to the write laser and the read laser for reading the control signal and in response controlling rotation of the turntable and operation of the write laser to record the information signal independently of the speed of rotation of the turntable. |
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DETAILED DESCRIPTION The invention is broadly concerned with transference of, or, creation of, more general patterns, random or regular, which may be formed on surfaces, composed of two or three dimensions, or within liquids by means of a modulated high intensity beam of coherent energy such as a laser beam.
The individual surface points so affected need not have importance as bits of information, but more generally, the pattern as a whole may be the important quantity.
According to the present invention, a self-timing optic lathe is provided in which each component of the lathe is capable of reliable independent synchronization.
, The optic lathe of the present invention facilitates the production of optical recordings including master discs for CD recording manufacture, as well as unique custom compilations of musical compact discs (CDs) and CD-ROM discs of alpha-numeric data.
According to one aspect of the present invention, a code track is located in an offset position, such as the outer surface of the turn-table on the optic lathe in a form and position which can be detected by associated apparatus.
The signals so detected may be used to reliably operate various servosystems employed in the motion control and light beam operation subsystems of the optic lathe.
In accordance with a general aspect of the present invention, there is provided a self-timing optic lathe comprising a source of information data signal, a code track embodying a precise optical recording of a control signal, an object disposed in a predetermined location relative to said code track, write means for directing a first energetic beam at said object, read means for directing a second energetic beam at said code track for reading said control signal, means for establishing relative positioning of said first and second energetic beams relative to one another, and timing and control means for connecting to said source and said read means for receiving said information data signal and said control signal and in response controlling location and timely operation of said write means and said means for establishing relative positioning of said first and second energetic beams to record said information data signal on said object, whereby said control signal provides an acceptably precise reference to control said relative positioning
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