Variable-power imaging optical system and imaging device

A variable-power imaging optical system is provided and includes three, negative, positive and positive lenses. A first group includes a negative lens and a positive lens. A second lens group includes a positive lens, a negative lens and an aberration-correcting lens. A third lens group includes an...

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Bibliographic Details
Main Author NODA TAKAYUKI
Format Patent
LanguageEnglish
Published 26.07.2007
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Abstract A variable-power imaging optical system is provided and includes three, negative, positive and positive lenses. A first group includes a negative lens and a positive lens. A second lens group includes a positive lens, a negative lens and an aberration-correcting lens. A third lens group includes an aberration-correcting lens L6. During zooming, the first and second lens groups are independently moved from each other. During focusing, the first and second lens groups are moved jointly. Ng2>1.6, nug2<29 and TL/YIM<11.0 are satisfied. (Ng2: refractive index of the second lens L2, nug2: Abbe number of the second lens L2, TL: maximum lens-system overall length, YIM: image height (a half length of a diagonal line).)
AbstractList A variable-power imaging optical system is provided and includes three, negative, positive and positive lenses. A first group includes a negative lens and a positive lens. A second lens group includes a positive lens, a negative lens and an aberration-correcting lens. A third lens group includes an aberration-correcting lens L6. During zooming, the first and second lens groups are independently moved from each other. During focusing, the first and second lens groups are moved jointly. Ng2>1.6, nug2<29 and TL/YIM<11.0 are satisfied. (Ng2: refractive index of the second lens L2, nug2: Abbe number of the second lens L2, TL: maximum lens-system overall length, YIM: image height (a half length of a diagonal line).)
Author NODA TAKAYUKI
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Snippet A variable-power imaging optical system is provided and includes three, negative, positive and positive lenses. A first group includes a negative lens and a...
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SubjectTerms ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
Title Variable-power imaging optical system and imaging device
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