Small zoom lens

Details Small zoom lens Small zoom lens

1986-03-25

1988-03-29

Corbin, John K.

350427, G02B 15177

Patent

active

047339527

ABSTRACT:
A zoom lens including a wide angle and having a zoom ratio of approximately two, in which a two-group zoom composed of a negative front group and a positive rear group is increased in a refracting power to make both the two-group zoom compact. With this, correction of aberrations is difficult to make, and therefore, the positive rear group is separated into two components so that in zooming, different moving amounts may be imparted to the respective components. The zoom lens according to the present invention is composed, from the front side, a first negative unit, a second positive unit and a third positive unit, whereby in zooming, the first unit lens is first moved toward an image along an optical axis and then toward an object, the second unit lens is moved toward the object, and the third unit lens is likewise moved toward the object so as to gradually widen a space between the third unit and the second unit.

REFERENCES:
patent: 4465343 (1984-08-01), Horimoto
patent: 4516839 (1985-05-01), Tokumaru
patent: 4591235 (1986-05-01), Tokumaru et al.

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