Projection lens for television projector

Details Projection lens for television projector Projection lens for television projector

1986-02-25

1989-12-26

Arnold, Bruce Y.

350412, 350418, G02B 1318, G02B 106

Patent

active

048894176

ABSTRACT:
A projection lens for a three-tube television projector of the type in which three CRT's of blue, green and red are projected on the screen. The projection lens comprises a plastic first lens having an extremely small refracting power, a glass second lens, a plastic third lens and a plastic fourth lens disposed immediately before a face plate of CRT. There are large spaces between the first lens and the second lens and between the third lens and the fourth lens so that reflecting mirrors may respectively be arranged therebetween. For reducing the cost, the fourth lens can be formed from a liquid lens filled with a liquid between a thin-wall shell and a face plate.

REFERENCES:
patent: 4348081 (1982-09-01), Betensky
patent: 4564269 (1986-01-01), Uehara
patent: 4576442 (1986-05-01), Oguino
patent: 4666261 (1987-05-01), Arai
patent: 4682862 (1987-07-01), Moskovich
patent: 4697892 (1987-10-01), Betensky
patent: 4704009 (1987-11-01), Yamamoto et al.

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