Photosensitive cell with light guide

Details Photosensitive cell with light guide Photosensitive cell with light guide

2006-11-28

2010-06-01

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C257S432000, C250S226000, C250S208100, C348S340000

Reexamination Certificate

active

07728278

ABSTRACT:
An integrated circuit having a photosensitive cell with an entry face, a photosensitive element and at least two elements forming a light guide and placed between the entry face and the photosensitive element. The second element is located between the first element and the entry face such that the two elements guide the light coming from the entry face onto the photosensitive element and each element forms a light guide. The inner volume has a first surface located on the same side as the photosensitive element, a second surface located on the same side as the entry face, and a lateral surface joining said first surface to said second surface and separating the inner volume from the outer volume. The first surface of the inner volume of the second element has a smaller area than that of the second surface of the inner volume of the first element.

REFERENCES:
patent: 6366365 (2002-04-01), Williamson
patent: 6858828 (2005-02-01), Roy et al.
patent: 7119321 (2006-10-01), Quinlan
patent: 2005/0001146 (2005-01-01), Quinlan
patent: 1 367 650 (2003-12-01), None
patent: WO 99/46618 (1999-09-01), None
T. H. Hsu et al., “Color Mixing Improvement of CMOS Image Sensor with Air-Gap-Guard Ring in Deep-Submicrometer CMOS Technology,” IEEE Electron Device Letters, vol. 26, No. 5, May 2005, pp. 301-303.

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