Optical: systems and elements – Lens – Reverse telephoto
Patent
1996-12-20
1998-06-02
Sugarman, Scott J.
Optical: systems and elements
Lens
Reverse telephoto
359782, G02B 1304, G02B 958
Patent
active
057609730
ABSTRACT:
A wide-angle lens system includes a first, second, third and fourth lens components which are arranged in this order in a direction from an object side to an image surface side along an optical axis. A stop is provided between the second lens component and the third lens component. The first lens component comprises a double-concave lens, the first lens component having a first refracting power .phi.1 which is negative. The second lens component comprises a positive lens and a negative lens which are arranged in this order in the direction, the second lens component having a second refracting power .phi.2 which is positive. The third lens component comprises a negative lens, a positive lens and a negative lens which are arranged in this order in the direction, the third lens component having a third refracting power .phi.3 which is positive. The fourth lens component comprises a negative lens, the fourth lens component having a fourth refracting power .phi.4 which is negative. In the lens system, the first refracting power, the second refracting power, the third refracting power, and the fourth refracting power satisfy the conditions: (1) 0.7<.phi.1/.phi.4<2.5; and (2) 1.8<.phi.2/.phi.3<7.0.
REFERENCES:
patent: 3352620 (1967-11-01), Scidmore et al.
patent: 3376091 (1968-04-01), Wagner et al.
patent: 3517986 (1970-06-01), Schlegel
patent: 4576444 (1986-03-01), Kawamura
patent: 4653873 (1987-03-01), Kawamura
patent: 4673259 (1987-06-01), Kawamura
Ricoh & Company, Ltd.
Sugarman Scott J.
LandOfFree
Compact wide-angle lens system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compact wide-angle lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compact wide-angle lens system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1467371