Reading lens for scanner

Details Reading lens for scanner Reading lens for scanner

1992-06-22

1994-05-10

Arnold, Bruce Y.

Optical: systems and elements

Lens

Multiple component lenses

359708, 359740, G02B 962, G02B 952, G02B 954

Patent

active

053113640

ABSTRACT:
A reading lens for a scanner to read an original in a reduced magnification, the lens comprising six lenses, i.e., from a first lens to a sixth lens in order on an optical axis. The first lens is a positive lens having a first lens-surface and a second lens-surface. The second lens is a negative lens disposed in contact with the first lens and has the second lens-surface in common with the first lens and a third lens-surface. The third lens is a meniscus lens and has a fourth lens-surface and a fifth lens-surface. The fourth lens is a meniscus lens and has a sixth lens-surface and a seventh lens-surface. The fifth lens is a negative lens and has a eighth lens-surface and a ninth lens-surface. The sixth lens is a positive lens disposed in contact with the fifth lens and has the ninth lens-surface in common with the fifth lens and a tenth lens-surface. At least one of the ten lens-surfaces is formed as an aspherical surface.

REFERENCES:
patent: 3459468 (1969-08-01), Marx et al.
patent: 3817599 (1974-06-01), McCrobic
patent: 4711536 (1987-12-01), Kouchiwa
patent: 4753522 (1988-06-01), Nishima
patent: 4902114 (1990-02-01), Arai
patent: 5040884 (1991-08-01), Kanoshima

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