Reduced height transmissive overhead projector

Details Reduced height transmissive overhead projector Reduced height transmissive overhead projector

G - Physics

03

B

88/46.5

G03B 21/132 (2006.01)

Patent

CA 1330894

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° 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.

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