Document Type and Number:
Japanese Patent JPS4957839
Kind Code:
A
Abstract:
In a microform reader, a grid is permanently inserted into the optical system near the projection lens, and a pair of crosshairs, remotely controlled, are located near the plane of the grid. The cross hairs provide a visual co-ordinate location within the grid pattern. A remotely controlled aperture stop is insertable into the optical path when it is desired to project a shadow image of the grid and the crosshairs onto the screen to aid in determining the location of information on the microform for rapid retrieval thereof.
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Application Number:
JP6433773A
Publication Date:
June 05, 1974
Filing Date:
June 07, 1973
Export Citation:
International Classes:
G03B21/11; G03B23/08; (IPC1-7): G03B21/11