Microform card including surface locating structure for eliminat

Details Microform card including surface locating structure for eliminat Microform card including surface locating structure for eliminat

1974-07-29

1976-06-29

Aegerter, Richard E.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

350241, 353120, 355125, G03B 2308, G02B 2702, G03B 2728

Patent

active

039663140

ABSTRACT:
Disclosed is an improved microform card which includes a wear-strip spacer element structure located on the card surface in one of several configurations, some containing coded secondary information. The wear-strip spacer elements separate the card surface from adjacent optical elements in a card utilizing apparatus by a distance sufficient to prevent the formation of colored Newton rings at the card-to-optical-element interface. Card utilization equipment capable of recognizing the presence of wear-strip spacer elements on a microform card and using any secondary information encoded thereon is also disclosed.

REFERENCES:
patent: 2468198 (1949-04-01), Heller
patent: 2923921 (1960-02-01), Shapin
patent: 3768897 (1973-10-01), Spani
patent: 3773415 (1973-11-01), Carabet et al.
patent: 3876299 (1975-04-01), Brown

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