Solid-state color image sensor with matrix-type color filter formed of filter elements each transmitting red, green and blue light

• US 4,652,911 A
• Filed: 09/06/1984
• Issued: 03/24/1987
• Est. Priority Date: 09/07/1983
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kohno, Akiyoshi, Teranishi, Nobukazu
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/647,742
• Time in Patent Office: 929 Days
• Field of Search: 358/41, 358/43, 358/44, 358/48
• US Class Current: 348/279
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: H04N 25/133 including elements passing panchromatic light, e.g. filters passing white light
• CPC Class Codes: H04N 25/134 based on three different wavelength filter elements

Abstract

A solid-state image sensor includes a color filter covering a solid-state imaging device and having at least three kinds of filter elements arranged in rows and columns. Each of the filter elements transmits red, green, and blue light over its entire surface area with a transmittance of at least 20 to 80 percent for each color light.

Claims

1. A solid-state color image sensor comprising a solid-state imaging device having a plurality of imaging elements and a color filter covering said solid-state imaging device, said color filter having a plurality of filter elements arranged in rows and columns, each of said filter elements transmitting red, green, and blue light over its entire surface area with corresponding transmittances of at least 20 to 80 percent for each said color light.

2. A solid-state color image sensor as claimed in claim 1, wherein said filter elements comprise:

yellow filters each transmitting red and green light, and also transmitting blue light with a transmittance of 20 to 80 percent;

cyan filters each transmitting blue and green light, and also transmitting red light with a transmittance of 20 to 80 percent; and

green filters each transmitting green light, and also transmitting blue and red light with respective transmittances of 20 to 80 percent,

3. A solid-state color image sensor as claimed in claim 2, wherein said filter elements further comprise white filters each transmitting red, green, and blue light.

4. A solid-state image sensor as claimed in claim 2, wherein said filter elements further comprise magenta filters each transmitting blue and red light, and also transmitting green light with a transmittance of approximately fifty percent.

5. A color filter for use with a solid-state imaging device, said color filter comprising:

a plurality of magenta filter elements each transmitting blue and red light, each said magenta filter element also transmitting green light with a transmittance of approximately fifty percent;

a plurality of yellow filter elements each transmitting red and green light, each said yellow filter element also transmitting blue light with a transmittance of 30 to 60 percent;

a plurality of cyan filter elements each transmitting blue and green light, each said cyan filter also transmitting red light with a transmittance of 30 to 60 percent; and

a plurality of green filter elements each transmitting green light, each said green filter element also transmitting blue and red light with respective transmittance of 30 to 60 percent;

said magenta, yellow, cyan, and green filter elements being arranged in a matrix of rows and columns of filter elements, first columns of said matrix comprising a repetitive sequential arrangement of filter elements disposed in the order of a magenta, a cyan, a green and a cyan filter element, and second columns of said matrix comprising a repetitive sequential arrangement of filter elements disposed in the order of a green, a yellow, a magenta, and a yellow filter element;

said matrix of rows and columns of filter elements being formed by a repetitive sequential arrangement of said first and second columns, with filter elements of said sequentially arranged columns forming said rows of said matrix.