Zoom lens of rear focus type

Details Zoom lens of rear focus type Zoom lens of rear focus type

1996-05-24

1998-05-12

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, 359684, 359685, 359740, G02B 1514

Patent

active

057514968

ABSTRACT:
A zoom lens of the rear focus type is disclosed, comprising, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power and a fifth lens unit of negative refractive power, wherein at least the second lens unit and the fourth lens unit are moved to vary magnification and the fourth lens unit is moved to effect focusing, and wherein the third lens unit comprises, in order from the object side to the image side, a positive lens and a negative lens having a strong concave surface facing the image side.

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patent: 5363242 (1994-11-01), Yokota
patent: 5430576 (1995-07-01), Hamano
patent: 5537255 (1996-07-01), Tochigi
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patent: 5548445 (1996-08-01), Yahagi
patent: 5583699 (1996-12-01), Nakayama

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