Projection lens for a television projector

Details Projection lens for a television projector Projection lens for a television projector

1985-04-18

1987-05-19

Corbin, John K.

350432, G02B 934, G02B 1318

Patent

active

046662618

ABSTRACT:
A projection lens in which F is approximately 1.0 to 1.3 used for a 3-tube television projector. The projection lens comprises a first lens of extremely low refractive power, two positive lenses arranged spaced apart from the first lens through a large air space and a negative fourth lens arranged spaced apart therefrom through a large air space, the first lens L.sub.1 having at least one surface in the form of an aspherical surface.
It is possible to arrange a reflecting mirror in the large air space to thereby form an optical system into a compact form. In addition, if the second lens L.sub.2 and the third lens L.sub.3 are made of glass, even if the first lens L.sub.1 and the fourth lens L.sub.4 are formed into plastic lenses, movement of focal point due to variation in temperature hardly occurs, and a lens of low cost may be obtained.

REFERENCES:
patent: 4577935 (1986-03-01), Yamakawa et al.
patent: 4603950 (1986-08-01), Uehara et al.

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