Information retrieval apparatus

Details Information retrieval apparatus Information retrieval apparatus

1991-05-21

1992-08-11

Cuchlinski, Jr., William A.

Optics: image projectors

Selective data retrieval

Film strip

353 27A, 377 18, 250570, 250557, G03B 2312

Patent

active

051373475

ABSTRACT:
An information retrieval apparatus used in a microfilm reader, a reader/printer, or the like includes a first illuminator for illuminating information and a mark recorded on an information recording medium, a second illuminator for illuminating the mark, and a detector for detecting the mark illuminated by the second illuminator. The second illuminator includes a solid-state light-emitting element for emitting monochromatic radiation having a wavelength of visible light. A designator designates an optimal position of the detector on the basis of a position of the mark projected on a screen is arranged.

REFERENCES:
patent: 3744890 (1973-07-01), Suzuki et al.
patent: 3820884 (1974-06-01), Sone et al.
patent: 3870410 (1975-03-01), Abe
patent: 3872453 (1975-03-01), Tsukamoto et al.
patent: 3958885 (1976-05-01), Stockinger et al.
patent: 4032230 (1977-06-01), Shipman et al.
patent: 4219737 (1980-08-01), Gagnon et al.
patent: 4570075 (1986-02-01), Spiero
IBM Technical Disclosure Bulletin, Keller et al., Sensing Device for Holes in Travelling Tape, vol. 18, No. 1, Jun. 1975.

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