Title: Large holographic memory with plural overlapping detector arrays

Abstract: Relatively large hologram storage plates, e.g., those storing a large number of discrete entries such as character definitions for a large character set, comprise an array of mini-holograms arranged in different memory plate sections. A different photodiode array is associated with each hologram plate section (for efficiency, some elements of different diode arrays may be common). When the stored contents of any mini-hologram are interrogated by a coherent light beam, the stored information is derived via the associated photodiode array and converged (as by OR logic) to memory output terminals.

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Inventors: Miyazaki, Suehiro (Yokohama, JA)
Matsubara, Itsuo (Fujisawa, JA)
Moriwaki, Masahiro (Tokyo, JA)
Sakaguchi, Mitsuhito (Tokyo, JA)
Nishida, Nobuo (Tokyo, JA)

Application Number: 450398
Filing Date: 1974-03-12
Publication_date: 1976-04-06
Assignee: Nippon Telegraph & Telephone Public Corporation (Tokyo, JA); Nippon Electric Company Limited (Tokyo, JA)
Primary Class(es): 250/208.2 250/550, 359/25, 365/125
Other Classes:
US Patent Ref:

3542448	Nov, 1970	Reynolds et al.	350/3.
3573433	Apr, 1971	Harris	340/173.
3576545	Apr, 1971	Meilleroux	340/173.
3758187	Sep, 1973	Thomas et al.	350/3.
3832565	Aug, 1974	Graf et al.	350/3.

Other Refs:
Primary Examiner: Stern, Ronald J.
Assistant Examiner:
Attorney: Hopgood, Calimafde, Kalil, Blaustein & Lieberman