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US 5,493,143 AGranted
Solid color image pickup device
AssigneeNEC Corporation
InventorYasuaki Hokari
Life of this patent
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Abstract
In a color CCD camera, a distance between a micro lens and a photodiode is determined dependent on a color light among red, green and blue. Alternative to this structure, a curvature of a micro lens is determined dependent on a color light among red, green and blue. In accordance with this structure, high sensitivity is obtained with improved color balance.
Claims1
A solid color image pickup device, comprising:
- first to third CCD devices for receiving first to third color lights of first to third wavelengths to generate first to third output signals;
- each of said first to third CCD devices comprising:
- an optoelectric conversion region provided on a semiconductor substrate, said optoelectric conversion region being supplied with a corresponding one of said first to third color lights to generate a corresponding one of said first to third output signals;
- a resin layer for covering said optoelectric conversion region;
- and
- a micro lens for focusing said corresponding one of said first to third color lights on said optoelectric conversion region;
- said resin layer having a predetermined thickness inherent to said corresponding one of said first to third color lights;
- said first, second and third CCD devices receiving red, green and blue color lights, respectively, for said first, second and third color lights;
- said predetermined thickness of said resin layer for said first CCD device being greater than that of said resin layer for said second CCD device;
- and said predetermined thickness of said resin layer for said third CCD device being less than that of said resin layer for said second CCD device.
7 more elements
Dependencies are inferred from the claim text.