Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2007-04-10
2007-04-10
Lee, John R. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S208100
Reexamination Certificate
active
11104789
ABSTRACT:
The photosensor includes a semiconductor substrate provided with a light receiving portion for converting incident light and a signal readout portion; a light shielding layer formed above the light receiving portion and having an aperture; and a transparent insulating layer formed so as to fill the aperture. A relationship 2nW≧λmax is satisfied, where W represents a minimum width of the aperture, n represents an average refractive index of the insulating layer in a region between a position corresponding to the uppermost surface of the light shielding layer and the surface of the light receiving portion, and λmax represents a maximum wavelength of the sensitive wavelength range of the light receiving portion. The aperture rate of the light receiving portion can be reduced without causing a sensitivity decrease and a change in spectral characteristics on the long wavelength side of the effective wavelength range.
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