Optics: image projectors – Composite projected image – Letters or numbers
Patent
1981-11-18
1984-05-15
Haroian, Harry N.
Optics: image projectors
Composite projected image
Letters or numbers
353102, G03B 2126
Patent
active
044485042
ABSTRACT:
A lens construction for a character projection unit and with the character projection unit including a plurality of light sources mounted in side-by-side relation, a plurality of corresponding condensor lenses, a plurality of corresponding projection lenses, and a plurality of corresponding characters disposed between the light sources and projection lenses to form a number of separate and individually complete projection systems within a confined volume, including at least one condensing lens plate in which is formed the plurality of individual condensing lenses, at least one projection lens plate in which is formed the plurality of individual projection lenses, and each of the complete projection systems including one of the individual condensing lenses formed in the condensor lens plate and the corresponding one of the individual projection lenses formed in the projection lens plate and with at least one of the lens surfaces of each of the complete projection systems formed as an aspheric surface whereby the projection system is less sensitive to the position of the corresponding light source.
REFERENCES:
patent: 1621741 (1927-03-01), Kellner
patent: 2637242 (1953-05-01), Osterberg et al.
patent: 2931027 (1960-03-01), Blefary et al.
patent: 3244071 (1966-04-01), Gumpertz
patent: 3332318 (1967-07-01), Gessel
patent: 3609012 (1971-09-01), Street
patent: 4145131 (1979-03-01), Yevick
patent: 4163604 (1979-08-01), Betensky
Street, Chan., "A Three Element Projector Condensing System", Journal of the SMPTE, vol. 79, No. 2, (Feb. 1970), pp. 85-87.
Haroian Harry N.
Industrial Electronic Engineers, Inc.
Roston Ellsworth R.
Schwartz Charles H.
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