Image forming lens system and image pickup apparatus using the same

An image forming lens system includes a front lens unit having a positive refractive power, and a rear lens unit, and does not include any other lens unit. The front lens unit includes a first lens unit having a positive refractive power and a second lens unit having a negative refractive power. Eac...

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Bibliographic Details
Main Authors Fujikura, Takashi, Ichikawa, Keisuke, Kawamura, Kazuteru
Format Patent
LanguageEnglish
Published 17.04.2018
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:An image forming lens system includes a front lens unit having a positive refractive power, and a rear lens unit, and does not include any other lens unit. The front lens unit includes a first lens unit having a positive refractive power and a second lens unit having a negative refractive power. Each of the first lens unit and the second lens unit includes a positive lens and a negative lens. The second lens unit is a focusing lens unit. The rear lens unit includes a positive lens and a negative lens. The second lens unit is the only lens unit that moves, in the front lens unit, and the following conditional expressions (1) and (2′) are satisfied: 0.5<fFF/f<1.65  (1) 0≦|f/rG2b|<6.5  (2′).
Bibliography:Application Number: US201615189439