Multiplexing document card reader with convex lens

Details Multiplexing document card reader with convex lens Multiplexing document card reader with convex lens

1975-12-24

1977-04-19

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Solid state light source

250569, 250578, H05B 3300, G06K 710, H01J 3912

Patent

active

040190650

ABSTRACT:
A document card reader including a row of light sources transmitting light through a corresponding series of column-like cavities within a pair of members between which a document card with punched openings therethrough may move and a convex lens placed so as to receive light transmitted through the document card openings and transmit the light from all of the openings to a photodetector positioned at substantially the focal point of the lens.

REFERENCES:
patent: 3786236 (1974-01-01), Sato et al.
patent: 3938662 (1976-02-01), Ernst, Jr. et al.
Seibel, "Reading Small, Tightly Spaced Bit Patterns", IBM Technical Bulletin, vol. 4, No. 10, Mar., 1962, p. 83.
Graham, Jr., "Columnator for Card Reader", IBM Technical Bulletin, vol. 9, No. 11, Apr. 1967, p. 1583.
Schwartz, "Photo-Logic Device", IBM Technical Bulletin, vol. 7, No. 1, June, 1964, p. 52.

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