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Title:
DIFFRACTIVE OPTICAL ELEMENT, OPTICAL SYSTEM HAVING SAME, IMAGE PICKUP DEVICE, AND LENS DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/179164
Kind Code:
A1
Abstract:
A diffractive optical element 10 has: a first diffraction grating 4; a second diffraction grating 5; and a film 6 that is provided between the first diffraction grating 4 and the second diffraction grating 5. The average value of refractive indexes of a film 6b at a wavelength of 550 nm, said film being provided between a grating wall surface 4b and a grating wall surface 5b, is represented by nha. When the refractive index of the first diffraction grating 4 at a wavelength of 550 nm is represented by n1, and the refractive index of the second diffraction grating 5 at a wavelength of 550 nm is represented by n2, the diffractive optical element (DOE) 10 satisfies conditional formula of n2

Inventors:
KOBAYASHI MIKIO (JP)
USHIGOME REONA (JP)
Application Number:
PCT/JP2017/013000
Publication Date:
October 04, 2018
Filing Date:
March 29, 2017
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Assignee:
CANON KK (JP)
International Classes:
G02B5/18; G02B13/00; G02B25/00
Domestic Patent References:
WO2011099550A12011-08-18
Foreign References:
JP2016218436A2016-12-22
JP2014170109A2014-09-18
JP2011257689A2011-12-22
Attorney, Agent or Firm:
ABE Takuma et al. (JP)
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