Imaging element and camera system

Abstract

An imaging element includes a plurality of photoelectric conversion sections. The photoelectric conversion sections are arrayed on a substrate to receive light incident through a dual-pass filter that has transmission bands for visible light and a predetermined range of near-infrared light. The photoelectric conversion sections include a visible light photoelectric conversion section and a near-infrared light photoelectric conversion section. The visible light photoelectric conversion section includes a red light photoelectric conversion section, a green light photoelectric conversion section, and a blue light photoelectric conversion section.

1 . An imaging element comprising:
 a plurality of photoelectric conversion sections that are arrayed on a substrate to receive light incident through a dual-pass filter having transmission bands for visible light and a predetermined range of near-infrared light,   wherein the photoelectric conversion sections include a visible light photoelectric conversion section and a near-infrared light photoelectric conversion section, and   the visible light photoelectric conversion section includes a red light photoelectric conversion section, a green light photoelectric conversion section, and a blue light photoelectric conversion section.   
     
     
         2 . The imaging element according to  claim 1 , wherein the red light photoelectric conversion section, the green light photoelectric conversion section, the blue light photoelectric conversion section, and the near-infrared light photoelectric conversion section are arrayed in a mosaic pattern. 
     
     
         3 . The imaging element according to  claim 1 , wherein the green light photoelectric conversion section is set to a higher placement ratio than the other photoelectric conversion sections. 
     
     
         4 . The imaging element according to  claim 1 , wherein the near-infrared light photoelectric conversion section includes a white light photoelectric conversion section. 
     
     
         5 . The imaging element according to  claim 1 , wherein a shallow trench structure for separating neighboring photoelectric conversion sections is formed on the substrate. 
     
     
         6 . The imaging element according to  claim 1 ,
 wherein a near-infrared absorption filter is selectively disposed on a light incident surface of the photoelectric conversion sections in correspondence with the visible light photoelectric conversion section, and   setup is performed so that a near-infrared light absorption band provided by the near-infrared absorption filter includes a near-infrared light transmission band of the dual-pass filter and extends toward a short wavelength side.   
     
     
         7 . The imaging element according to  claim 6 , wherein the near-infrared light absorption band provided by the near-infrared absorption filter is set to include the near-infrared light transmission band of the dual-pass filter even in a case where the near-infrared light transmission band is shifted toward the short wavelength side due to oblique light incidence. 
     
     
         8 . The imaging element according to  claim 7 , wherein the near-infrared absorption filter includes at least two different coloring substances differing in near-infrared light absorption characteristics. 
     
     
         9 . The imaging element according to  claim 8 ,
 wherein the near-infrared absorption filter includes a first near-infrared absorption layer and a second near-infrared absorption layer, and   the first near-infrared absorption layer includes one of the two different coloring substances, and the second near-infrared absorption layer includes the remaining one of the two different coloring substances.   
     
     
         10 . The imaging element according to  claim 8 , wherein the near-infrared absorption filter includes a single layer. 
     
     
         11 . The imaging element according to  claim 6 , wherein the near-infrared absorption filter is selectively disposed in correspondence with the red light photoelectric conversion section, the green light photoelectric conversion section, and the blue light photoelectric conversion section. 
     
     
         12 . The imaging element according to  claim 6 , wherein the near-infrared absorption filter is selectively disposed for the blue light photoelectric conversion section in the visible light photoelectric conversion section. 
     
     
         13 . The imaging element according to  claim 6 , wherein a color filter and the near-infrared absorption filter are stacked over the light incident surface of the visible light photoelectric conversion section. 
     
     
         14 . The imaging element according to  claim 13 , wherein at least a part of the near-infrared absorption filter is embedded into an opening in a light-shielding layer separating neighboring photoelectric conversion sections. 
     
     
         15 . The imaging element according to  claim 1 , further comprising:
 a near-infrared absorption layer that is disposed integrally with or separately from the dual-pass filter,   wherein the near-infrared light transmission band of the dual-pass filter is sandwiched between a first absorption band and a second absorption band, the first absorption band and the second absorption band being provided for near-infrared light in the near-infrared absorption layer.   
     
     
         16 . The imaging element according to  claim 15 , wherein the near-infrared absorption layer includes at least two different coloring substances differing in near-infrared light absorption characteristics. 
     
     
         17 . The imaging element according to  claim 16 ,
 wherein the near-infrared absorption layer includes a first near-infrared absorption layer and a second near-infrared absorption layer, and   the first near-infrared absorption layer includes one of two different coloring substances, and the second near-infrared absorption layer includes the remaining one of the two different coloring substances.   
     
     
         18 . The imaging element according to  claim 16 , wherein the near-infrared absorption layer includes a single layer containing two different coloring substances differing in near-infrared light absorption characteristics. 
     
     
         19 . A camera system comprising:
 an optical section that forms an image of a subject;   an imaging element that includes a plurality of photoelectric conversion sections, the photoelectric conversion sections being arrayed on a substrate to receive light incident through a dual-pass filter having transmission bands for visible light and a predetermined range of near-infrared light; and   a signal processing section that processes signals from the photoelectric conversion sections,   wherein the photoelectric conversion sections include a visible light photoelectric conversion section and a near-infrared light photoelectric conversion section, and   the signal processing section performs computation after changing a matrix coefficient in accordance with a position of a photoelectric conversion section, the matrix coefficient being used to perform computation for eliminating an influence of near-infrared light included in a signal from the visible light photoelectric conversion section.