Optical arrangement for use in a microfiche reader and method

Details Optical arrangement for use in a microfiche reader and method Optical arrangement for use in a microfiche reader and method

1980-03-04

1982-06-15

Haroian, Harry N.

Optics: image projectors

Light shield, mask, hood, or diaphragm

353121, G03B 2114

Patent

active

043347436

ABSTRACT:
A microfiche reader is disclosed herein and includes an optical arrangement for providing an image of a supported microfiche on a projection screen. This optical arrangement utilizes a beam of light which is directed from a light source along a path through the microfiche and towards the back side of the screen. A condenser lens is located on this beam path between the microfiche and light source and includes a focal point also located on the path but on the other side of the microfiche. A projection lens assembly is located between the microfiche and the focal point of the condenser lens, again on the beam path, such that there is a predetermined spacing between the projection lens assembly and focal point. This spacing is selected to increase and preferrably maximize illumination efficiency of the overall optical arrangement.

REFERENCES:
patent: 1395338 (1921-11-01), Gage
patent: 2817997 (1957-12-01), Ulffers
patent: 3413061 (1968-11-01), Simpson et al.

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