发明授权
- 专利标题: Wide angle lens and imaging device
- 专利标题(中): 广角镜头和成像装置
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申请号: US13257446申请日: 2010-03-24
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公开(公告)号: US08643958B2公开(公告)日: 2014-02-04
- 发明人: Issei Abe , Hayato Yoshida , Naoki Moniwa
- 申请人: Issei Abe , Hayato Yoshida , Naoki Moniwa
- 申请人地址: JP Tokyo
- 专利权人: Ricoh Company, Ltd.
- 当前专利权人: Ricoh Company, Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权: JP2009-106706 20090424
- 国际申请: PCT/JP2010/055782 WO 20100324
- 国际公布: WO2010/122882 WO 20101028
- 主分类号: G02B9/64
- IPC分类号: G02B9/64 ; G02B13/18
摘要:
A wide angle lens whose field angle exceeds 160 degrees, includes a front group, an aperture stop, and a rear group arranged in this order from an object-side toward an image-side. The front group includes a first lens (negative meniscus) whose convex surface faces the object, a second lens (negative), a third lens (negative), and a fourth lens (positive), arranged in this order from the object-side toward the image-side. The rear group includes a fifth lens (positive), a sixth lens (negative), and a seventh lens (positive), arranged in this order from an aperture-side toward the image-side. The fifth and sixth lenses are combined, forming a cemented lens having positive refractive power. The fifth and sixth lenses are made of materials having Abbe numbers of greater than or equal to 50 and less than or equal to 30, respectively. A surface of the seventh lens facing the image is aspheric.
公开/授权文献
- US20120056978A1 WIDE ANGLE LENS AND IMAGING DEVICE 公开/授权日:2012-03-08
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