Title:
回折レンズ、およびこれを用いた撮像装置
Document Type and Number:
Japanese Patent JP4630393
Kind Code:
B2
Abstract:
A diffractive lens 11 that 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.
Inventors:
Tsunehiro Korenaga
Takamasa Ando
Takamasa Ando
Application Number:
JP2010532367A
Publication Date:
February 09, 2011
Filing Date:
December 18, 2009
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
G02B13/00; G02B5/18; G02B13/18
Domestic Patent References:
| JP2008052787A | 2008-03-06 | |||
| JP2008191299A | 2008-08-21 | |||
| JP2007291291A | 2007-11-08 |
Foreign References:
| WO2007132787A1 | 2007-11-22 |
Attorney, Agent or Firm:
Seiji Okuda