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Image sensor
| Details |
Inventors: Dobashi, Hideki;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Tran; Minhloan
Assistant Examiner: Mandala, Jr.; Victor A.
Attorney, Agent or Firm: Morgan & Finnegan LLP
It is an object of this invention to provide the structure of an image sensor capable of efficiently collecting light in the center and in the periphery of an imaging plane. To achieve this object, an image sensor includes a plurality of photoelectric conversion portions, a high refractive index portion having a first portion formed into the shape of a pillar and a taper shape portion whose aperture area increases toward a side close to a photographing lens, and a low refractive index portion placed around the high refractive index portion. Letting x1 be an aperture width on the side at which the aperture area of the taper shape is large, x2 be an aperture width on the side at which the aperture area of the taper shape is small, .theta..degree. be the inclination angle of the taper shape, n1 be the refractive index of the high refractive index portion, n2 be the refractive index of the low refractive index portion, F be the F number of the photographing lens, R be the distance from the center of the optical axis of the photographing lens to the photoelectric conversion portion, and f be the distance from the position of the pupil of the photographing lens to an imaging plane, the high refractive index portion is formed into a shape which satisfies relations represented by 1>x2/x1.gtoreq.(1-tan .theta./tan .theta.')/(1+tan .theta./tan .theta.') and cos .theta.'.gtoreq.n2/n1 where .theta.'=.theta.0'+2.theta. and sin .theta.0'=1/2n1F+R/n1f. |
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DETAILED DESCRIPTION The present invention, therefore, has been made in consideration of the above situation, and has as its object to provide the structure of an image sensor capable of efficiently collecting light in the center and in the periphery of an imaging plane, and also capable of collecting slant incident light which changes in accordance with the F number of a photographing lens.
To solve the above problems and achieve the above object, according to a first aspect of the present invention, an image sensor is characterized by comprising a plurality of photoelectric conversion portions each of which photoelectrically converts an object image formed by a photographing lens, a high refractive index portion which is placed on each of the plurality of photoelectric conversion portions to cover at least part of the photoelectric conversion portion, and includes a first portion positioned near the photoelectric conversion portion and formed into a shape of a square pillar or column having a substantially uniform thickness, and a second portion formed contiguously with the first portion and having a taper shape whose aperture area increases from a side close to the photoelectric conversion portion to a side close to the photographing lens, and a low refractive index portion placed around the high refractive index portion, and having a refractive index lower than that of the high refractive index portion, wherein letting x1 be an aperture width on a side at which the aperture area of the taper shape is large, x2 be an aperture width on a side at which the aperture area of the taper shape is small, .
theta.
.
degree.
be an inclination angle of the taper shape, n1 be the refractive index of the high refractive index portion, n2 be the refractive index of the low refractive index portion, F be an F number of the photographing lens, R be a distance from a center of an optical axis of the photographing lens to the photoelectric conversion portion, and f be a distance from a position of a pupil of the photographing lens to an imaging plane in which the plurality of photoelectric conversion portions are arranged, the high refractive index portion is formed into a shape which satisfies relations represented by 1>x2/x1
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MEMS 
