| 摘要 |
A solid-state image pickup device capable of taking more light into light receiving regions is provided. The solid-state image pickup device of the present invention includes: a photoelectric conversion unit having a plurality of light receiving regions that are two-dimensionally arrayed, the photoelectric conversion unit for photoelectrically converting light incident on each of the light receiving regions, and outputting an electric signal according to the intensity of the incident light; a lens unit comprising a plurality of converging lenses provided on an upper layer of the photoelectric conversion unit, each of the converging lens being provided corresponding to a set of continuous first to third light receiving regions; and a dispersing element provided between the photoelectric conversion unit and the lens unit, the dispersing element being formed of a medium whose refractive index varies periodically, and diffracting beams of a first wavelength band and of a third wavelength band, having been transmitted through the converging lens, and directing the beams onto the first light receiving region and the third light receiving region, and transmitting, without diffracting, a beam of a second wavelength band, having been transmitted through the converging lens, and directing the beam onto the second light receiving region. |
| 主权项 |
1. A solid-state imaging device comprising:
a photoelectric conversion unit having a plurality of light receiving regions that are two-dimensionally arrayed, the photoelectric conversion unit for photoelectrically converting light incident on each of the light receiving regions, and outputting an electric signal according to the intensity of the incident light; a lens unit comprising a plurality of converging lenses provided on an upper layer of the photoelectric conversion unit, each of the converging lenses being provided corresponding to a set of continuous first to third light receiving regions; and a dispersing element provided between the photoelectric conversion unit and the lens unit, the dispersing element having an incident surface and an emission surface and being formed of a medium whose refractive index varies periodically, and diffracting beams of a first wavelength band and of a third wavelength band, having been transmitted through the converging lens, and directing the beams onto the first light receiving region and the third light receiving region, and transmitting, without diffracting, a beam of a second wavelength band, having been transmitted through the converging lens, and directing the beam onto the second light receiving region, the dispersing element being a photonic crystal in which within a first medium having a first dielectric constant, a plurality of parallel columnar components, formed of a second medium having a second dielectric constant different from the first dielectric constant, are arranged periodically, and each of the columnar components is arranged so as to be parallel to the incident surface of the dispersing element and orthogonal to the direction along which the first to third light receiving regions are continuously arrayed, wherein in a cross section orthogonal to each of the columnar components, each of the columnar components is positioned on each of intersections of a grating having, as a unit cell, a parallelogram whose adjacent sides are unequal and whose interior angles are not right angles, and letting the sign of the angle that the beam of the first wavelength band emitted from the dispersing element forms with the emission surface of the dispersing element be positive, then the sign of the angle that the beam of the third wavelength band emitted from the dispersing element forms with the emission surface of the dispersing element is negative. |
