Optics: image projectors – Cabinet encloses projector and one side of screen – Reflector between lamp and screen
Patent
1977-07-28
1979-02-20
Aegerter, Richard E.
Optics: image projectors
Cabinet encloses projector and one side of screen
Reflector between lamp and screen
353 27R, 353 55, G03B 2110, G03B 2128
Patent
active
041403770
ABSTRACT:
A viewer is provided which is especially adapted for viewing dental X-ray films taken of the mouth of a patient. The viewer is provided with a throat extending inwardly from the front thereof which vertically divides the housing into upper and lower sections. A display screen is provided on the front of the upper section of the housing with a light compartment for a light source on the side thereof. The light source includes a dichroic filter for filtering out the infrared rays of the high intensity light provided and a condensing lens for projecting the visible rays down through a film located in the throat to provide an image bearing beam. In the lower section of the housing, a mirror located below the film horizontally reflects the image bearing beam through a projection lens onto a second mirror which directs the image bearing beam rearwardly and upwardly onto a rear mirror located on the upper section of the housing opposite the screen. The projection lens provides for focussing the image bearing beam such that upon reflecting from the rear mirror it provides an enlarged image of the film on the screen.
REFERENCES:
patent: 2473736 (1949-06-01), Stern
patent: 2576586 (1951-11-01), Frankel
patent: 2852980 (1958-09-01), Schroder
patent: 3440956 (1969-04-01), Miller
patent: 3489494 (1970-01-01), Snider
patent: 3733121 (1973-05-01), Smitzer
patent: 3834800 (1975-09-01), Brownscombe
patent: 4030821 (1977-06-01), Badalich
Aegerter Richard E.
Matlago John T.
Shepperd John W.
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