Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1996-12-12

1998-03-10

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

057268118

ABSTRACT:
A compact lens system is disclosed which includes a first lens group and a second lens group. The first lens group, which has an overall positive refractive power, includes a first meniscus lens, convex toward an object, and having a positive refractive power. Also included is a second biconcave lens having a negative refractive power, and a third biconvex lens which is connected to the second lens and which has a positive refractive power. The first lens group further includes a fourth biconvex lens which has a positive refractive power. The second lens group has an overall negative refractive power, and includes: a fifth concave lens having a positive refractive power; a sixth concave lens having a negative refractive power; and a seventh lens having a negative refractive power. The magnification of the system can be changed by varying a distance between the first and the second lens group in accordance with the following condition:

REFERENCES:
patent: 4929069 (1990-05-01), Shibayama
patent: 4998808 (1991-03-01), Shibayama
patent: 5144489 (1992-09-01), Shibayama
patent: 5398135 (1995-03-01), Ohashi
patent: 5576891 (1996-11-01), Ohashi
patent: 5636061 (1997-06-01), Kang

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