Reduced height transmissive overhead projector

Details Reduced height transmissive overhead projector Reduced height transmissive overhead projector

1986-12-19

1988-05-03

Haroian, Harry N.

Optics: image projectors

Unitary plural refracting surfaces

353DIG3, 353102, G03B 2114

Patent

active

047416130

ABSTRACT:
A transmissive overhead projector includes a Fresnel lens assembly which has an f-number of about 0.25 and is capable of dioptrically focusing light at an incident angle of at least 60.degree. with respect to a perpendicular to the Fresnel lens assembly. This refractive power of the Fresnel lens assembly allows the overhead projector light source to be positioned very close to the Fresnel lens assembly and consequently allows a significant reduction in the base height of the overhead projector.

REFERENCES:
patent: 3653754 (1972-04-01), Yamanaka
patent: 3702395 (1972-11-01), Rosendahl
patent: 3770344 (1973-11-01), Fukushima
patent: 3915568 (1985-10-01), Yamada et al.
patent: 4080052 (1978-03-01), Levin et al.
patent: 4118114 (1978-10-01), Anderson et al.
patent: 4436392 (1984-03-01), Vanderwerf

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