Development of an Optical Disc Recorder
Final technical rept. 1 Oct 1975-1 Oct 1977
PHILIPS LABS BRIARCLIFF MANOR NY
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A laboratory-prototype, digital, optical disc recorder was developed with a storage capacity of 10 to the 10th power bits. Recording is done by laser machining of micron-sized pits in a thin tellurium film allowing direct-read- after-write DRAW of the information. The recording format maps each bit of information to a recorded pit. The tellurium is deposited on a clear plastic disc configured to be self-protecting and easily handled. The major accomplishment was demonstrating the feasibility of an inexpensive recorder and disc suitable for operation in a normal office environment. The key developments were a sensitive recording material, a plastic disc, and a self-protected disc configuration called the air sandwich. Various materials were considered for the disc substrate and its protection selection was based primarily on macro and microscopic flatness, thickness uniformity, strength, optical properties, adherence of DRAW film, and cost.
- Lasers and Masers