Patent ID: 8045268

Claim:
An imaging device having a single lens, the device comprising: a diffraction grating lens as the single lens; an angle-of-view restriction member for defining a viewing angle of the diffraction grating lens; and an imaging element for receiving light transmitted through the diffraction grating lens, wherein, the diffraction grating lens includes a lens substrate having a first face and a second face, at least one of the two faces having an aspheric shape, and the lens substrate having a positive power, and a diffraction grating formed on one of the two faces of the lens substrate; and [ eq . ⁢ 15 ] 0.21 ⁢ ⁢ m 2 ⁢ ⁢ v d ⁢ λ ⁢ f h max < Λ min < 0.30 ⁢ ⁢ m 2 ⁢ v d ⁢ λ ⁢ f h max ( 1 ) is satisfied, where: is a minimum zonal pitch; m is an order of diffraction; v d is an Abbe number of the lens substrate material with respect to the d-line; λ is a wavelength; f is an effective focal length; and h max is an effective radius of the face on which the diffraction grating is formed.