Browse Prior Art Database

Color Separation Laser Scanning Apparatus

IP.com Disclosure Number: IPCOM000088160D
Original Publication Date: 1977-Apr-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Zory, PS: AUTHOR

Abstract

As shown in Fig. 1, a colored original document is rotated on the copy drum past a scanning station to provide one of the roster scan movements. A white laser source, for example hollow cathode He-Cd laser, is focused and vertically scanned through slot S along line C on the copy drum. Two ellipsoidal cylindrical reflector surfaces, having respective focal lines along A and B and a common focal line along C, will focus the light scattered from any point on C onto lines A and B.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Color Separation Laser Scanning Apparatus

As shown in Fig. 1, a colored original document is rotated on the copy drum past a scanning station to provide one of the roster scan movements. A white laser source, for example hollow cathode He-Cd laser, is focused and vertically scanned through slot S along line C on the copy drum. Two ellipsoidal cylindrical reflector surfaces, having respective focal lines along A and B and a common focal line along C, will focus the light scattered from any point on C onto lines A and B.

As shown in Fig. 2, long thin photodetectors A(1), A(2) and B(1), B(2) may be deployed along the lines A and B to detect the radiation thereat. These detectors may be filtered to be sensitive to blue green-yellow, red, and unfiltered to be sensitive to the total radiation.

The document movement and vertical laser scan produces a roster scan which is color-separated by the photodetectors to yield a time-distributed electrical signal manifestative of the spatial distribution and color intensity of the document.

1

Page 2 of 2

2

[This page contains 4 pictures or other non-text objects]