Reproducer for an eraseable videodisc

Details Reproducer for an eraseable videodisc Reproducer for an eraseable videodisc

1976-06-08

1978-11-14

Eddleman, Alfred H.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003G, 1791003V, 350162SF, 350173, 250570, 365124, H04N 576

Patent

active

041258606

ABSTRACT:
An apparatus optically reproduces FM electric signals from the recording medium recorded with said electric signals in the form of a change in refraction index. The apparatus is so constructed that a pair of laser beams are incident on the recording medium at substantially the same point with an angle defined between the laser beams; a diffracted light obtained by causing each of said beams to be diffracted, upon being transmitted through the recording medium, in accordance with the phase change pattern thereof is overlapped on a non-diffracted light obtained by causing the each of said beams to be transmitted through the recording medium without being diffracted; and optically phase-modulated signals are detected as a beat output produced by optical mixing of the diffracted light with the non-diffracted light, thus to reproduce a recorded signal.

REFERENCES:
patent: T953002 (1976-12-01), Firester
patent: 1765882 (1930-06-01), Romer
patent: 3534166 (1970-10-01), Korpel
patent: 3623024 (1971-11-01), Hamilton
patent: 3629517 (1971-12-01), Grimm
patent: 3696344 (1972-10-01), Feinleib
patent: 3731290 (1973-05-01), Aagard
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3904835 (1975-09-01), Matsumoto
patent: 3909608 (1975-09-01), LeMerer
patent: 3919562 (1975-11-01), Whitman
patent: 3969576 (1976-07-01), Boonstra
patent: 3971002 (1976-07-01), Bricot
"Amorphous-Semiconductor Switching," by H. K. Henisch, Scientific American, Nov., 1969, vol. 221, No. 5, pp. 30-41.

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