发明申请
- 专利标题: DIFFRACTIVE LENS AND IMAGE PICKUP DEVICE USING THE SAME
- 专利标题(中): 差分透镜和图像拾取器件使用相同
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申请号: US13000430申请日: 2009-12-18
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公开(公告)号: US20110102898A1公开(公告)日: 2011-05-05
- 发明人: Tsuguhiro Korenaga , Takamasa Ando
- 申请人: Tsuguhiro Korenaga , Takamasa Ando
- 优先权: JP2008-335115 20081226
- 国际申请: PCT/JP2009/007033 WO 20091218
- 主分类号: G02B5/18
- IPC分类号: G02B5/18
摘要:
A diffractive lens 11 according to the present invention includes: a lens base 18, which has a second surface 13 with first and second groups of diffraction grating portions 20 and 21; and a protective coating 17, which is arranged on the first group of diffraction grating portions 20. The first group of diffraction grating portions 20 has a first group of diffraction steps and the second group of diffraction grating portions 21 has a second group of diffraction steps, which is lower in height than the first group of diffraction steps. One of the respective materials of the base 18 and the protective coating 17 has a higher refractive index and a greater Abbe number than the other material. And the second group of diffraction steps is not covered with the protective coating 17.
公开/授权文献
- US08441728B2 Diffractive lens and image pickup device using the same 公开/授权日:2013-05-14
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