Portable map display device

Details Portable map display device Portable map display device

1982-09-07

1984-03-20

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

353 77, 353 11, G03B 2308

Patent

active

044377398

ABSTRACT:
A portable display device for projecting on a built-in rear projection screen a road map, navigation chart and the like. The road map or navigation chart is in the form of one of a plurality of microfilm frames removably installed in a cut-out portion of a hollow drum in which is disposed a projection lamp. The drum is indexable in angular position and in longitudinal position such as to display an appropriate portion or frame of the microfilm.

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patent: 3209645 (1965-10-01), Guttman
patent: 3498707 (1970-03-01), Allen
patent: 3762808 (1973-10-01), Sandmeier
patent: 3797925 (1974-03-01), Smitzer
patent: 3838916 (1974-10-01), Gawin et al.

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