Film card with reference frame

Details Film card with reference frame Film card with reference frame

1978-04-10

1980-09-30

Stephan, Steven L.

Optics: image projectors

Picture carrier

3401463H, G03B 2100

Patent

active

042252172

ABSTRACT:
A film card for use in an automatic microfilm display apparatus has a plurality of image frames, each bearing a marker image. One of the frames is a reference frame and includes only the marker image. The reference frame can be used for accurate positioning of a raster pattern on the remaining frames.

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patent: 3700795 (1972-10-01), Eckenbert
patent: 3753240 (1973-08-01), Merwin
patent: 3868476 (1975-02-01), Laplume
patent: 4149784 (1979-04-01), Johnson et al.

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