Invention Grant
US08149517B2 Zoom lens unit, imaging device and portable information terminal device
有权
变焦镜头单元，成像设备和便携式信息终端设备
- Patent Title: Zoom lens unit, imaging device and portable information terminal device
- Patent Title (中): 变焦镜头单元，成像设备和便携式信息终端设备
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Application No.: US12766249Application Date: 2010-04-23
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Publication No.: US08149517B2Publication Date: 2012-04-03
- Inventor: Kazuyasu Ohashi
- Applicant: Kazuyasu Ohashi
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2009-106714 20090424; JP2009-249192 20091029; JP2010-033021 20100217
- Main IPC: G02B15/14
- IPC: G02B15/14
Abstract:
A zoom lens unit, including in order from an object side to an image side: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; and a fourth lens group having a positive refracting power, an aperture stop being disposed between the second and the third lens groups, and the third lens group having a positive lens made of an optical glass material which satisfies the following formulae: (1) 1.52
Public/Granted literature
- US20100271710A1 ZOOM LENS UNIT, IMAGING DEVICE AND PORTABLE INFORMATION TERMINAL DEVICE Public/Granted day:2010-10-28
Information query
