Zoom lens

Details Zoom lens Zoom lens

1991-12-06

1993-08-03

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359687, 359715, G02B 1514, G02B 1318

Patent

active

052334716

ABSTRACT:
A zoom lens is provided, in which a fixed first lens group having a positive refracting power, a second lens group having a negative refracting power and which realizes a variable magnification, a fixed third lens group having a positive refracting power and a fourth lens group having a positive refracting power which compensates fluctuation of an image surface caused by the variable magnification and which focuses an image are sequentially provided from an object side. In this zoom lens, the third lens group is composed of two separate lenses of a positive lens (31) and a negative lens (32). At least one surface of the positive lens (31) is formed as an aspherical surface and a surface of the negative lens (32) opposing the image surface side is concaved to the image surface side. Thus, the zoom lens of this invention can be miniaturized and reduced in weight without deteriorating the characteristics such that a variable magnification is large and that an F number is small.

REFERENCES:
patent: 4802747 (1989-02-01), Horiuchi
patent: 4818083 (1989-04-01), Mihara
patent: 4859042 (1989-08-01), Tanaka
patent: 4995707 (1991-02-01), Hashimoto
86 Optik, 73 (1986), "A novel configuration of zoom lens", Kazuo Tanaka, Video Products Development Center, Canon Inc., Japan.

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