Projection lens system

Details Projection lens system Projection lens system

1987-05-20

1988-08-02

Corbin, John K.

350412, G02B 2718, G02B 960

Patent

active

047610638

ABSTRACT:
A projection lens system is disclosed which comprises in order from a screen side, a first lens unit having a positive focal length, a second lens unit having a negative focal length, a third lens unit having a positive focal length, a fourth lens unit having a positive focal length and a fifth lens unit having a negative focal length and a concave surface directed toward the screen side. The first and second lens units being made of plastic. At least one of lens surfaces of the first and second lens unit is aspherical. At least one of lens surfaces of the third and fourth lens units is aspherical. The fifth lens unit is made of plastic and at least one of lens surfaces of the fifth lens unit is aspherical.

REFERENCES:
patent: 4691996 (1987-09-01), Cho

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