Zoom lens

Details Zoom lens Zoom lens

1990-06-21

1992-03-31

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1515

Patent

active

051002230

ABSTRACT:
A zoom lens of this invention comprises in successive order from the object side a first group having a positive refractive power and fixed, a second group having a negative refracting power for effecting a variation of image magnification by moving on the optical axis, a third group having a positive power for effecting a light condensing action and fixed, and a fourth group moving on the optical axis so as to keep an image surface position to be changed in response to a move of the second group and a move of the object in a constant positional relation with the reference surface. Comparatively large air space is provided between the third and fourth groups of the zoom lens.

REFERENCES:
patent: 4364642 (1982-12-01), Yanaka et al.
patent: 4460251 (1984-07-01), Okudira
patent: 4478496 (1984-10-01), Kato
patent: 4653872 (1987-03-01), Takahashi
patent: 4749267 (1988-06-01), Mihara
patent: 4859042 (1989-08-01), Tanaka

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