Small three-unit variable focal length lens system

Details Small three-unit variable focal length lens system Small three-unit variable focal length lens system

1991-07-08

1993-06-01

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, 359713, G02B 1516, G02B 1318

Patent

active

052165477

ABSTRACT:
A variable focal length lens system having, in the order from the object side, a first positive lens unit, a second positive lens unit and a third negative lens unit. In order to vary the focal length from the wide position to the tele position, the first positive lens unit and the third negative lens unit are moved jointly or independently toward the object side while the second positive lens unit is moved toward the object side at a lower speed than the first and third lens units. The variable focal length lens system satisfies the following conditions:

REFERENCES:
patent: 4726668 (1988-02-01), Nakayama et al.
patent: 4773744 (1988-09-01), Yamanashi

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