Wide angle lens system for use in copying machine

Details Wide angle lens system for use in copying machine Wide angle lens system for use in copying machine

1989-11-13

1991-01-01

Arnold, Bruce Y.

350432, 350450, G02B 964, G02B 1318

Patent

active

049813447

ABSTRACT:
A wide angle lens system having, from the object side, a first lens of a negative refractive power, a second lens of a positive meniscus lens, a third lens of a negative meniscus lens, a fourth lens of a positive meniscus lens, a diaphragm, a fifth lens being symmetrical with the fourth lens with respect to the diaphragm, a sixth lens being symmetrical with the third lens with respect to the diaphragm, a seventh lens being symmetrical with the second lens with respect to the diaphragm, and a eighth lens being symmetrical with the first lens. Each of the first and eighth lenses may have an aspherical surface in rotation symmetry with each other with respect to the diaphragm. Also, some of the lenses may be made of synthetic resin.

REFERENCES:
patent: 3922071 (1975-11-01), Kitagawa et al.
patent: 4560242 (1985-12-01), Tokuhara et al.
patent: 4561730 (1985-12-01), Lawson et al.
patent: 4738517 (1988-04-01), Nishina et al.

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