Projection lens

Details Projection lens Projection lens

1984-01-16

1986-08-05

Corbin, John K.

350412, 350473, G02B 1318, G02B 934

Patent

active

046039503

ABSTRACT:
A projection lens for enlargedly projecting the image of a cathode ray tube onto a screen comprises, in succession from the screen side, a first lens having a positive refractive power, a second lens having a positive refractive power and having its surface of sharper curvature facing the screen side, the second lens being disposed at or near the entrance pupil position of the entire system, a biconvex third lens having a positive refractive power, and a fourth lens having a negative refractive power and having its surface of sharper curvature facing the screen side.

REFERENCES:
patent: 3429997 (1969-02-01), Rosner et al.
patent: 3868173 (1975-02-01), Miles et al.
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky
patent: 4530575 (1985-07-01), Yamakawa

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