Optics: image projectors – Selective data retrieval – Plural picture rows on single microcard
Patent
1977-10-27
1980-01-22
Stephan, Steven L.
Optics: image projectors
Selective data retrieval
Plural picture rows on single microcard
353 21, 353 95, 353DIG5, G03B 2114
Patent
active
041847547
ABSTRACT:
An overhead projector comprises a stage having at least two guide members fixed to its upper surface and movable longitudinally and transversely above a projector body, a file page having a plurality of slide films fitted therein in rows and columns and pairs of reference edges spaced apart at equidistances from crosswise and lengthwise center axes of the file page and adapted to abut against the guide members of the stage for positioning the file page relative to the stage, and positioning means for determining movements of the stage at determined intervals. The slide films in the file page are spaced apart at distances correspondingly equal to the movement distances determined by the positioning means. The projector is capable of correctly positioning a file page relative to the stage with ease after the file page has been rotated or turned upside down for changing over the projection methods of the projector, such as reflection projection and transmission projection.
REFERENCES:
patent: 3264767 (1966-08-01), Coffman
patent: 3269261 (1966-08-01), Porter
patent: 3466126 (1969-09-01), Sakamoto
patent: 3542463 (1970-11-01), Klein
patent: 3642359 (1972-02-01), Kitch
patent: 3709590 (1973-01-01), Bisberg
patent: 3807850 (1974-04-01), Ozeki
Keihoku Seiki Manufacturing Company
Stephan Steven L.
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