Optics: image projectors – Prism in light path
Patent
1984-07-24
1985-12-10
Haroian, Harry N.
Optics: image projectors
Prism in light path
353102, 353119, G03B 2128
Patent
active
045570558
ABSTRACT:
The present invention relates to a rainbow image projector adapted to project a vivid rainbow image from a relatively small light source onto walls of a stage, a store, places for various parties, and like. Specifically, light rays emitted from the linear incandescent light source are converted by a cylindrical condenser lens into parallel light rays which are, in turn, obliquely incident on a triangular prism over whole area of its first refraction plane. Thus, it is possible to project a vivid rainbow image of a large curvature radius from the small light source of small power consumption and heat generation. A housing containing therein said linear light source, cylindrical condenser lens and prism and provided with a projection window is inclination-adjustably mounted an inclination adjustment screw on a support leg so that a direction in which the rainbow image is projected may be variable. Said housing further comprises a blower for cooling contained therein and has a rear cover for exchange of the light source so that a useful life of the light source may be prolonged and maintenance and/or checking thereof may be easily done.
REFERENCES:
patent: 563334 (1896-07-01), Tucker
patent: 1811770 (1931-06-01), Wheeler
patent: 2341223 (1944-02-01), Lillie
patent: 3479117 (1969-11-01), Tronnier et al.
Haroian Harry N.
Nihon Ouyou Kougaku Kabushiki Kaisha
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