Variable-focal-length objective

Details Variable-focal-length objective Variable-focal-length objective

1980-06-02

1983-01-18

Corbin, John K.

G02B 1516

Patent

active

043689558

ABSTRACT:
The variable-focal-length objective for motion-picture cameras and especially color television cameras comprises two movable groups of lens elements placed between two stationary groups of lens elements and capable of displacement so as to produce a variation of the focal distance. In this objective, the two movable groups each take part in the total variation of magnification; each elementary magnification has a minimum and maximum absolute value during the variation, such that the ratio of maximum value to minimum value is higher than 1:1. However, only one of the two movable groups which does not pass through a magnification of unity performs both a magnification function and an additional focusing function. On the other hand, the other movable group which may pass through a position corresponding to a magnification of unity performs only a magnification function.

REFERENCES:
patent: 3891304 (1975-06-01), Muszumanski et al.
patent: 4270848 (1981-06-01), Angenieux

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