发明授权
- 专利标题： Optical accessory arranged to change optical characteristic of shooting lens
- 专利标题（中）： 光学配件安排改变拍摄镜头的光学特性
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申请号： US11683715申请日： 2007-03-08
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公开(公告)号： US07675693B2公开(公告)日： 2010-03-09
- 发明人: Masaru Sakamoto
- 申请人： Masaru Sakamoto
- 申请人地址： JP
- 专利权人： Canon Kabushiki Kaisha
- 当前专利权人： Canon Kabushiki Kaisha
- 当前专利权人地址： JP
- 代理机构： Rossi, Kimms & McDowell LLP
- 优先权： JP2006-080461 20060323
- 主分类号： G02B9/04
- IPC分类号： G02B9/04
摘要：
An optical accessory having a high optical performance arranged to change an optical characteristic of a shooting lens and to be attached on the object side of a shooting lens is provided. The optical accessory FE is to be detachably attached to the object side of a master lens M and has at least one lens FE having a negative refractive power. The image-side surface r2 of the lens FE is designed to have an aspherical shape having a negative refractive power that decreases toward its periphery.
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