Wide-angel aspheric zoom lens

Details Wide-angel aspheric zoom lens Wide-angel aspheric zoom lens

1994-04-07

1996-09-03

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359680, 359682, 359713, G02B 1514, G02B 15177

Patent

active

055529372

ABSTRACT:
A first lens group having a negative refracting power and a second lens group having a positive refracting power are arranged in order from the photographing object side. Zooming is performed by changing the aerial interval between the first and second lens groups, and both the first and second lens groups have one or more aspheric surfaces. The first lens group includes two negative lenses and a positive lens which are arranged in order from the object side, and the second lens group includes a positive lens, a cemented lens having a positive lens and a negative lens, and a positive lens which are arranged in order from the object side.

REFERENCES:
patent: 4726665 (1988-02-01), Itoh
patent: 4726667 (1988-02-01), Tachihara
patent: 5054897 (1991-10-01), Ozawa
patent: 5076677 (1991-12-01), Sato
patent: 5155629 (1992-10-01), Ito et al.
patent: 5175649 (1992-12-01), Uzawa

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