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

The invention relates to a wide-angle optical system, imaging lens device, monitor camera, and digital apparatus. 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...

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Bibliographic Details
Main Authors NAKATANI TORU, MATSUSAKA KEIJI
Format Patent
LanguageChinese
English
Published 18.08.2010
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:The invention relates to a wide-angle optical system, imaging lens device, monitor camera, and digital apparatus. 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 a spherical surface. The front lens group (11) satisfies the conditional expression [nv]dp<29 where [nv]dp is the minimum value of the Abbe number of the positive lens(es) included in the front lens group (11).
Bibliography:Application Number: CN20088108550