WIDE-ANGLE LENS AND IMAGING DEVICE

A wide-angle lens having a field angle larger than 180 degrees includes, in order from an object side to an image side, a front group, a reflection surface, and a back group, wherein the front group includes three lenses having a negative refractive power, the reflection surface is configured to cur...

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Main Authors SATOH, HIROYUKI, HARADA, TORU, TAKENAKA, HIROKAZU, BESSHO, DAISUKE, YAMAMOTO, HIDEAKI, TERAO, NORIYUKI, IRINO, YOSHIAKI, MASUDA, KENSUKE, IMAE, NOZOMI, TANAKA, TOMONORI, SAWAGUCHI, SATOSHI
Format Patent
LanguageEnglish
French
German
Published 25.02.2015
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:A wide-angle lens having a field angle larger than 180 degrees includes, in order from an object side to an image side, a front group, a reflection surface, and a back group, wherein the front group includes three lenses having a negative refractive power, the reflection surface is configured to curve an optical axis of the front group at 90 degrees toward the back group, the back group includes four lenses having a positive refractive power, a front principal point is set between a second lens and a third lens from the object side in the front group, and a focal length of an entire system f and a distance between an intersection of the reflection surface and the optical axis of the front group and the front principal point d satisfy the following condition (1). 7.0 < d / f < 9.0
Bibliography:Application Number: EP20120816857