Optical disc unit, fabrication method and cooperating write and/

Details Optical disc unit, fabrication method and cooperating write and/ Optical disc unit, fabrication method and cooperating write and/

1981-05-18

1982-12-21

Hartary, Joseph W.

Recorders

Record receivers and/or driving means therefor

Disc

3461351, 358342, 369284, 369287, G01D 1532

Patent

active

043652581

ABSTRACT:
An optical disc-unit including (i) a flexible, disc-shaped support bearing a record layer, (ii) a flexible disc-shaped cover sheet which is transparent to write/read light and (iii) annular retaining means which engage the support and sheet, in spaced relation, substantially continuously around peripheral regions. In preferred embodiments the retaining means symmetrically tension the sheet and support into substantially flat dispositions. Cooperative optical disc write/read apparatus and optical disc-unit fabrication methods are also disclosed.

REFERENCES:
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patent: 3359549 (1967-12-01), Farrand et al.
patent: 3373413 (1968-03-01), Treseder
patent: 3381085 (1968-04-01), Johnson et al.
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patent: 3805292 (1974-04-01), Hashiguchi et al.
patent: 3815146 (1974-06-01), Nash
patent: 4038663 (1977-07-01), Day et al.
patent: 4074282 (1978-02-01), Balas, Jr. et al.
patent: 4222070 (1980-09-01), Howe
patent: 4264911 (1981-04-01), Wilkinson
patent: 4308545 (1981-12-01), Lehureau

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