Optical: systems and elements – Lens – With graded refractive index
Patent
1994-09-21
1997-10-21
Epps, Georgia Y.
Optical: systems and elements
Lens
With graded refractive index
G02B 300
Patent
active
056802544
ABSTRACT:
A lens for reading an original has first to third lens groups sequentially arranged from an object side toward an image side. The first lens group is constructed by a first lens as a positive meniscus lens having a convex face on the object side. The second lens group is constructed by a second lens as a biconcave lens. The third lens group is constructed by a third lens as a biconvex lens. The first lens is constructed by a refractive index distribution type lens having a refractive index changed in a direction perpendicular to an optical axis of the original reading lens. Each of the second and third lenses is constructed by a refractive index distribution type lens having a refractive index changed in a direction of the optical axis. Otherwise, at least one of the first, second and third lenses may be constructed by a refractive index distribution type lens. In this lens construction, the original reading lens can be made compact and a field angle of this lens can be easily widened and high performance of the original reading lens can be easily realized.
REFERENCES:
patent: 4859040 (1989-08-01), Kitagishi et al.
patent: 4998807 (1991-03-01), Uzawa et al.
patent: 5011272 (1991-04-01), Nakayama et al.
patent: 5054898 (1991-10-01), Kitagishi et al.
patent: 5268791 (1993-12-01), Tsuchida
Iwata Noriyuki
Miyatake Naoki
Nishina Kiichiro
Ueda Takeshi
Yamaguchi Takao
Bey Dawn-Marie
Epps Georgia Y.
Ricoh & Company, Ltd.
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