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Browse Prior Art Database

CHARGE COUPLED DEVICE FOR LINE SEQUENTIAL COLOR SCANNING

IP.com Disclosure Number: IPCOM000023288D
Original Publication Date: 1977-Jun-30
Included in the Prior Art Database: 2004-Mar-29
Document File: 2 page(s) / 316K

Publishing Venue

Xerox Disclosure Journal

Abstract

A charge coupled device 10 for line sequential color scanning. The device 10 includes an optically active imaging array 12 having a plurality of photosites. Where three color separa-tions are desired, the device also includes three parallel coupled optically inactive analog shift registers 14, 16 and 18, which may be formed on the same semiconductor substrate as imaging array 12. Each line of the document or pictoral image 20 is sequentially exposed to the array 12 through a color filter wheel 22 that is divided into segments (e.g., red, green and blue) that allow only the transmission of the de-sired spectral range for each color separation. After each exposure, the charges in the array 12 are sequentially down-wardly transferred in parallel to the next shift register where they are stored until all three color separations for the particular line can be simultaneously shifted out in serial fashion, For example, document 20 is first exposed through the red filter onto the array 12. The resulting charges in the photosites of array 12 are then transferred in parallel to shift register 14 where they are temporarily stored. Filter wheel 22 is rotated to expose the same line of document 20 through the green filter onto the array 12. The

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XEROX DISCLOSURE JOURNAL

CHARGE COUPLED DEVICE FOR LINE Proposed Classification
SEQUENTIAL COLOR SCANNING U.S. Cl. 307/221
RobertR. Brooks mt. Cl. H03k 21/00

ceo

IMAGING ARRA( ~

REGIST BLUE

SHIFT REGISTER GREEN

io~' ~~IFT REGISTER RED

A charge coupled device 10 for line sequential color scanning.
The device 10 includes an optically active imaging array 12
having a plurality of photosites. Where three color separa~
tions are desired, the device also includes three parallel
coupled optically inactive analog shift registers 14, 16 and
18, which may be formed on the same semiconductor substrate as
imaging array 12. Each line of the document or pictoral image
20 is sequentially exposed to the array 12 through a color
filter wheel 22 that is divided into segments (e.g., red,
green and blue) that allow only the transmission of the de~
sired spectral range for each color separation. After each
exposure, the charges in the array 12 are sequentially down~
wardly transferred in parallel to the next shift register
where they are stored until all three color separations for
the particular line can be simultaneously shifted out in
serial fashion, For example, document 20 is first exposed
through the red filter onto the array 12. The resulting
charges in the photosites of array 12 are then transferred in
parallel to shift register 14 where they are temporarily
stored. Filter wheel 22 is rotated to expose the same line of
document 20 through the green filter onto the array 12. The

20

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