Optical: systems and elements – Lens – With variable magnification
Patent
1996-09-24
1998-07-07
Font, Frank G.
Optical: systems and elements
Lens
With variable magnification
359689, G02B 1514
Patent
active
057778000
ABSTRACT:
A zoom lens includes, in the order named from an object side, a first lens group having a positive refracting power and a second lens group having a negative refracting power, in which magnification change is conducted by changing a distance between said first and second lens groups. The first lens group has, in the order named from the object side, a 1a lens component having a negative refracting power, including a 1-1 lens having a negative refracting power and a 1-2 lens made of a plastic material, at least one surface of which is an aspherical surface, and a 1b lens component having a positive refracting power. The second lens group has, in the order named from the object side, a 2-1 lens having a positive refracting power made of a plastic material, at least one surface of which is an aspherical surface, and a 2-2 lens having a negative refracting power. The zoom lens satisfies the following conditional expression,
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Patent Abstracts of Japan Publication #06130298, dated 13 May 1994 (one page).
Mori Nobuyoshi
Yamaguchi Susumu
Bierman Jordan B.
Font Frank G.
Konica Corporation
Stafira Michael P.
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