Solid-state imaging device

• US 20060066743A1
• Filed: 09/26/2005
• Published: 03/30/2006
• Est. Priority Date: 09/29/2004
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Ueda, Daisuke, Yoshida, Shinji, Onozawa, Kazutoshi
• Granted Patent: US 7,586,530 B2
• Time in Patent Office: Days
• US Class Current: 348/340
• CPC Class Codes: H01L 27/14685 Process for coatings or optical elements
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils

Abstract

The present invention provides a solid-state imaging device including an optical element that efficiently condenses even a wide-angle incident light and has a color separation function. The solid-state imaging device includes pixels, and in the device each pixel includes: a light receiving element; and an optical element, whose surface at least, is made of metal, the optical element has: an aperture; and convex parts which are arranged cyclically, and a distance between adjacent convex parts and a width of each convex part range from 0 to 1 wavelength of light to be condensed.

Claims

1. A solid-state imaging device comprising pixels,

wherein each pixel includes:

a light receiving element; and

an optical element, whose surface at least, is made of metal,

said optical element has;

an aperture; and

convex parts which are arranged cyclically, and

a distance between adjacent convex parts and a width of each convex part range from 0 to 1 wavelength of light to be condensed.

2. The solid-state imaging device according to claim 1,

wherein each convex part is arranged cyclically like concentric circles.

3. The solid-state imaging device according to claim 1,

wherein each convex part is arranged cyclically like similar polygons.

4. The solid-state imaging device according to claim 2,

wherein said convex parts consist of pillar-shaped convexes.

5. The solid-state imaging device according to claim 1,

wherein a distance between said adjacent convex parts and a width of each convex part correspond to a color of light to be condensed.

6. The solid-state imaging device according to claim 1,

wherein a distance between said adjacent convex parts and a width of each convex part correspond to an angle of incident light to be condensed.

7. The solid-state imaging device according to claim 1,

wherein a distance between a top surface of said light receiving element and a base surface of said optical element is not more than 3 wavelengths of light to be condensed.

8. The solid-state imaging device according to claim 1,

wherein a height of each convex part ranges from 0 to not more than 1 wavelength of light to be condensed.

9. The solid-state imaging device according to claim 1,

wherein adjacent optical elements are electrically isolated from each other.

10. The solid-state imaging device according to claim 3,

wherein said convex parts consist of pillar-shaped convexes.