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COLOR COPIES FROM A COLOR COPIER WITH BLACK AND WHITE TV CAMERA AND CRT DISPLAY INPUT

IP.com Disclosure Number: IPCOM000025287D
Original Publication Date: 1984-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 177K

Publishing Venue

Xerox Disclosure Journal

Abstract

As shown in Figure 1, copying of a full TV frame may be accomplished by placing a black and white television receiver (CRT display) 11 having TV tube or CRT 12 face down on the platen 34 of a color copier 10 and turning off the scan lamps 33 (Figure 2). The color filter pack (not shown) of the copier 10 are removed and the filters are appropriately cycled in front of a TV camera lens (not shown). The only panchromatic response required is from the TV camera itself. In the case of computer generated color or electronic signals, the display should be successively driven by the green, blue and red signals in synchronism with the color copier magneta, yellow and cyan print cycles.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

COLOR COPIES FROM A COLOR COPIER WITH BLACK AND WHITE TV CAMERA AND CRT DISPLAY INPUT
Louis D. Mailloux

Proposed Classification
U.S. CI. 355/4

Int. C1. G03g 15/01

James E. Bollman

NG.2

0 --I----------&

- 11

\ r

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Volume 9 Number 3 May/June 1984

205

[This page contains 1 picture or other non-text object]

Page 2 of 4

COLOR COPIES FROM A COLOR COPIER WITH BLACK AND WHITE TV CAMERA AND CRT DISPLAY INPUT (Cont'd)

EDGE

1

r

1

EDGE LAMP

TOP AND BOTTOM

LAMPS

II

206 XEROX DISCLOSURE JOURNAL

Volume 9 Number 3 May/June 1984

[This page contains 1 picture or other non-text object]

Page 3 of 4

COLOR COPIES FROM A COLOR COPIER WITH BLACK AND WHITE TV CAMERA AND CRT DISPLAY INPUT (Cont'd)

As shown in Figure 1, copying of a full TV frame may be accomplished by placing a black and white television receiver (CRT display) 11 having TV tube or CRT 12 face down on the platen 34 of a color copier 10 and turning off the scan lamps 33 (Figure 2). The color filter pack (not shown) of the copier 10 are removed and the filters are appropriately cycled in front of a TV camera lens (not shown). The only panchromatic response required is from the TV camera itself. In the case of computer generated color or electronic signals, the display should be successively driven by the green, blue and red signals in synchronism with the color copier magneta, yellow and cyan print cycles.

The image portion displayed could usefully be any number of scan lines up to that which fills the copier aperture slit. The three color TV images should be updated in register with the photoreceptor drum position. It is often assumed that the drum velocity is constant and a fixed frequency clock is used to drive the electronic vertical scan. If a large number of scan lines are used, slight image blur may be the only result of drum jitter. If a small number of scan lines are used, for example, one drum jitter can result in horizontal lines or stripes in the output copy. An alternate solution would be to use a position signal directly derived from the color copier drum or mechanical scanning mechanism to update and generate the electronic vertical scan.

Consideration was given to refocusing the color copier at a plane above the platen and to optimum positioning of the phosphor image of the tube or CRT in that plane. A negative focal length supplementary lens (not shown) produces the desired result.

An alternate solution not requiring the additional negative focal length lens is to remove the color copier platen glass 30 from its frame 32 of platen 34 as shown in Figure 2. The curved face plate 13 of the TV tube 12 then extends downward through the object plane 31.

If it is desired to retain the normal platen copying function, an auxiliary lens 43 may be positioned for imaging a single scan line onto the selenium drum 40 of the co...