Zoom lens with close-up lens

Details Zoom lens with close-up lens Zoom lens with close-up lens

1993-02-04

1994-04-12

Kwon, John T.

Optical: systems and elements

Lens

With variable magnification

359693, G02B 1514

Patent

active

053030869

ABSTRACT:
A zoom lens with a close-up lens has first to fifth lens groups arranged in this order from the object side. Each of the first, second and fifth lens groups has a positive power and each of the third and fourth lens groups has a negative power. The first to fifth lens groups are arranged so that the spaces between the second to fifth lens groups change when the zoom lens is zoomed from a shortest focal length to a longest focal length and at the same time the first lens group can be moved along the optical axis in response to change in the optical length between an object point and the first lens group so that the object side focal point of the first lens group coincides with the object point.

REFERENCES:
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patent: 3961845 (1976-06-01), Doi et al.
patent: 3970367 (1976-07-01), Tsuji
patent: 4854685 (1989-09-01), Corbasson
patent: 4906078 (1990-03-01), Inabata et al.
patent: 4988174 (1991-01-01), Horiuchi et al.
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5100223 (1992-03-01), Ono et al.
patent: 5196962 (1993-03-01), Aoki
patent: 5218476 (1993-06-01), Ito
patent: 5241421 (1993-08-01), Endo et al.

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