Invention Grant
- Patent Title: Zoom lens, imaging device and information device
- Patent Title (中): 变焦镜头,成像设备和信息设备
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Application No.: US14200639Application Date: 2014-03-07
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Publication No.: US09013802B2Publication Date: 2015-04-21
- Inventor: Yohei Takano , Hiromichi Atsuumi
- Applicant: Yohei Takano , Hiromichi Atsuumi
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2011-121122 20110530; JP2011-149582 20110705; JP2011-182948 20110824
- Main IPC: G02B15/14
- IPC: G02B15/14 ; G02B15/16 ; G02B15/17 ; G02B27/00 ; G02B15/173

Abstract:
A zoom lens includes, in order from an object side in an optical axis a first lens group having a positive refractive power, a second lens group having a negative refractive power; a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, a fifth lens group having a positive refractive power, and an aperture stop arranged between the third lens group and the fourth lens group, an interval between the first lens group and the second lens group being increased, an interval between the second lens group and the third lens group being varied, an interval between the third lens group and the fourth lens group being decreased, and an interval between the fourth lens group and the fifth lens group being decreased when changing a magnification from a wide-angle end to a telephoto end.
Public/Granted literature
- US20140185145A1 ZOOM LENS, IMAGING DEVICE AND INFORMATION DEVICE Public/Granted day:2014-07-03
Information query