Patent · US Active

Wide-angle optical system, image pickup lens device, monitor camera, and digital apparatus

US8576501B2 · kind B2 · utility

1Cited by

2References

20Claims

0Family size

Assignee

Konica Minolta Opto, Inc. · JP

Inventors

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

Key dates

Filing date	Sep 22, 2008
Grant date	Nov 5, 2013
Priority date	—
Expiry date	Sep 15, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/06
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A wide-angle optical system comprises a front lens group (11), and a rear lens group (12), with an aperture stop (13) interposed between. The front lens group (11) includes at least two negative lenses (111, 112) and at least one positive lens (113). At least one of the positive lenses included in the front lens group (11) has at least one aspherical surface. The front lens group (11) satisfies the conditional expression vdp<29 where vdp is the minimum value of the Abbe number of the positive lens(es) included in the front lens group (11).

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