Patent · US Active

Wide angle optical system, imaging lens device, monitor camera, and digital apparatus

US8531578B2 · kind B2 · utility

2Cited by

2References

22Claims

0Family size

Assignee

Konica Minolta Opto, Inc. · JP

Inventors

Keiji Matsusaka · Osaka, JP
Toru Nakatani · Uda, JP

Key dates

Filing date	Oct 22, 2008
Grant date	Sep 10, 2013
Priority date	—
Expiry date	Oct 4, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/18
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Provided are a wide angle optical system having better optical performance, low in cost, and compact in size, an imaging lens device having the wide angle optical system, a monitor camera, and a digital apparatus. The wide angle optical system (1) has, in order from the object side to the image side, a first lens (11) having a negative optical power, a second lens (12) having a negative optical power, a third lens (13) having a positive optical power, an aperture (15), and a fourth lens (14) having a positive optical power. The wide angle optical system satisfies the conditional expression of 3<f34/f<10, where f34 is the composite focal length of the third and fourth lenses (13, 14) and f is the focal length of the entire system.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.