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...

Full description

Saved in:
Bibliographic Details
Main Authors TANAKA TOMONORI, ZE KOUCONG, TERAO NORIYUKI, SATOH HIROYUKI, IRINO YOSHIAKI, MASUDA KENSUKE, YUAN TIANHENG, JIN JIANGWANG, YAMAMOTO HIDEAKI, TAKENAKA HIROKAZU, BESSHO DAISUKE
Format Patent
LanguageChinese
English
Published 02.04.2014
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
Online AccessGet full text

Cover

More Information
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 principle 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 principle point d satisfy the following condition (1). (l) 7.0 < d / f < 9.0
Bibliography:Application Number: CN201280036931