Optical: systems and elements – Lens – Multiple component lenses
Patent
1998-05-07
1999-07-27
Epps, Georgia
Optical: systems and elements
Lens
Multiple component lenses
359663, 359740, G02B 936, G02B 960
Patent
active
059300566
ABSTRACT:
A Gauss lens achieves a high reading density when used with an imaging magnification of about 0.16535 and reduces the cost while providing a sufficient angle of view and brightness. The Gauss lens includes: a first lens group including a first lens having a positive meniscus shape; a second lens group including a second lens having a positive meniscus shape and a third lens having a negative meniscus shape, the second and third lenses being connected with each other; a third lens group including a fourth lens having a negative meniscus shape and a fifth lens having a positive meniscus shape, the fourth and fifth lenses being connected with each other; and a fourth lens group including a sixth lens having a positive meniscus shape, wherein the following conditions are satisfied:
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patent: 3136840 (1964-06-01), Buzawa
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patent: 4377326 (1983-03-01), Kobayashi
patent: 4671627 (1987-06-01), Shinohara
patent: 4784480 (1988-11-01), Yokota et al.
patent: 5285319 (1994-02-01), Kanoshima
Epps Georgia
Lester Evelyn A.
Ricoh Company, Ltd
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