1983-02-03
1985-07-23
Corbin, John K.
350412, 350469, G02B 934, G02B 1318
Patent
active
045305757
ABSTRACT:
A video projector lens system is provided, which comprises first positive lens, second positive lens, third negative lens, fourth positive lens and fifth negative lens. The third negative lens is made of plastic and located for correcting chromatic aberration, while the first or second positive lens is made of plastic for cancelling the temperature depending characteristic of the second negative plastic lens with its counterbalanced positive refractive power, wherein at least one aspheric surface is made on the plastic lens. The fourth positive lens bearing a considerable part of the positive refractive power distributed in the whole lens system is made of glass for avoiding further temperature dependency.
REFERENCES:
patent: 3429997 (1969-02-01), Rosner et al.
patent: 3516734 (1970-06-01), Schmidt
patent: 3800085 (1974-03-01), Ambats et al.
patent: 3868173 (1976-02-01), Miles et al.
patent: 3961844 (1976-06-01), Betensky
patent: 4348081 (1982-09-01), Betensky
Corbin John K.
Minolta Camera Kabushiki Kaisha
Price Joseph W.
Sugarman Scott J.
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