Zoom lens capable of changing a range of variable focal length

Details Zoom lens capable of changing a range of variable focal length Zoom lens capable of changing a range of variable focal length

1991-08-05

1992-03-17

Sugarman, Scott J.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

G02B 1504

Patent

active

050973606

ABSTRACT:
A zoom lens capable of changing the range of variable focal length to another limit, comprising, from front to rear, a zoom section including a variator and a compensator arranged upon zooming movement to vary the focal length in a predetermined range, a diaphragm, and a relay lens section receptive of the afocal light beam from the zoom section to form an image and having a front lens unit and a rear lens unit, the front lens unit being provided with a fixed sub-unit and an interchangeable sub-unit in this order from the front, wherein the interchangeable sub-unit is removed to create a space between the fixed sub-unit and the rear lens unit, into which a range changing lens unit is then inserted, so that the range of variable focal length is changed.

REFERENCES:
patent: 3751136 (1973-08-01), Kirchoff
patent: 4015895 (1977-04-01), Hirose
patent: 4146305 (1979-03-01), Tanaka
patent: 4240697 (1980-12-01), Takano
patent: 4318592 (1982-03-01), Tanaka
patent: 4330180 (1982-05-01), Tanaka

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