Image pickup apparatus with filter on incident side of image pickup region
An image pickup apparatus includes an image pickup region in which a plurality of pixels are arranged, each pixel including a plurality of photoelectric conversion portions disposed in the depth direction of a semiconductor; and a filter which is disposed on the incident side of the image pickup region and which has a characteristic wherein the transmittance of light in the visible wavelength region decreases as the wavelength of light becomes longer.
1. An image pickup apparatus comprising:
an image pickup region in which a plurality of pixels are arranged, each pixel including a plurality of photoelectric conversion portions disposed in the depth direction of a semiconductor, wherein the plurality of photoelectric conversion portions comprises first, second and third regions at different depths, wherein the first region is closest to the surface of the image pickup region, the second region is between the first and the third region, and the third region is farthest from the surface of the image pickup region; and
a filter which is disposed on the incident side of the image pickup region and which has a characteristic wherein the transmittance of light in the visible wavelength region decreases as the wavelength of light becomes longer, and the transmittance is at least 90% at a wavelength of 400 nm and continuously decreases from the wavelength of 400 nm to 700 nm so that with any increase in the wavelength in the range from 400 nm to 700 nm the transmittance decreases; and
wherein the filter includes at least one of a dielectric multilayer film evaporated on a transparent substrate and a material which absorbs light in a predetermined wavelength range, or a combination of the dielectric multilayer film evaporated on the transparent substrate and the material which absorbs light in a predetermined wavelength range, and
means for i) causing the spectral sensitivity of the first region to become closer to the spectral sensitivity of the human eye to visible blue light, ii) causing the spectral sensitivity of the second region to become closer to the spectral sensitivity of the human eye to visible green light, and iii) causing the spectral sensitivity of the third region to become closer to the spectral sensitivity of the human eye to visible red light, wherein said means comprises said filter.
2. An image pickup apparatus comprising:
an image pickup region in which a plurality of pixels are arranged, each pixel including a plurality of photoelectric conversion portions disposed in the depth direction of a semiconductor, wherein the plurality of photoelectric conversion portions comprises first, second and third regions at different depths, wherein the first region is closest to the surface of the image pickup region, the second region is between the first and the third region, and the third region is farthest from the surface of the image pickup region; and
a filter which is disposed on the incident side of the image pickup region and which has a characteristic wherein the transmittance of light having a wavelength of 450 nm to 650 nm decreases as the wavelength of light becomes longer, and the transmittance is at least 90% at a wavelength of 400 nm and continuously decreases from the wavelength of 400 nm to 700 nm so that with any increase in the wavelength in the range from 400 nm to 700 nm the transmittance decreases; and
wherein the filter includes at least one of a dielectric multilayer film evaporated on a transparent substrate and a material which absorbs light in a predetermined wavelength range, or a combination of the dielectric multilayer film evaporated on the transparent substrate and the material which absorbs light in a predetermined wavelength range, and
means for i) causing the spectral sensitivity of the first region to become closer to the spectral sensitivity of the human eye to visible blue light, ii) causing the spectral sensitivity of the second region to become closer to the spectral sensitivity of the human eye to visible green light, and iii) causing the spectral sensitivity of the third region to become closer to the spectral sensitivity of the human eye to visible red light, wherein said means comprises said filter.
3. The image pickup apparatus according to claim 1 , wherein T1>0.7>T2>0.2>T3 is satisfied when the transmittance of the filter at a wavelength of 450 nm is represented by T1, the transmittance at a wavelength of 550 nm is represented by T2, and the transmittance at a wavelength of 650 nm is represented by T3.
4. The image pickup apparatus according to claim 2 , wherein T1>0.7>T2>0.2>T3 is satisfied when the transmittance of the filter at a wavelength of 450 nm is represented by T1, the transmittance at a wavelength of 550 nm is represented by T2, and the transmittance at a wavelength of 650 nm is represented by T3.