Holographic reading apparatus with an area identification and de

Details Holographic reading apparatus with an area identification and de Holographic reading apparatus with an area identification and de

1977-09-28

1979-04-10

Hecker, Stuart N.

Static information storage and retrieval

Read/write circuit

Optical

35 48B, 235455, 365234, G11C 700, G11C 800, G11C 1304

Patent

active

041492692

ABSTRACT:
A large number of closely spaced holograms are formed on a sheet, each hologram comprising an information portion and an identification portion. First scan means movably position the sheet relative to a reconstruction beam and a sensor means for reading a selected hologram. The sensor means reads the identification portion of the reconstructed hologram to determine whether said hologram is the selected hologram. If said hologram is the selected hologram, a second scan means is actuated to read the information area. If said hologram is not the selected hologram, the first scan means is actuated to move to the next hologram. The process is continued until the selected hologram is located. The identification area further comprises a density reference section which is read to produce a bias reference signal for combination with the information signals. In digital applications the bias reference signal establishes the quantization threshold. In analog applications the bias reference signal establishes the bias point for differential amplification.

REFERENCES:
patent: 2295000 (1942-09-01), Morse
patent: 3072889 (1963-01-01), Willcox
patent: 3229047 (1966-01-01), Simpson
patent: 3290987 (1966-12-01), James et al.
patent: 3882468 (1975-05-01), Ormsby
patent: 3887276 (1975-06-01), Clay et al.

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