Browse Prior Art Database

PRINTER AND CONTROLLER FOR USE WITH A HIGH RESOLUTION IMAGE SIGNAL

IP.com Disclosure Number: IPCOM000026891D
Original Publication Date: 1994-Apr-30
Included in the Prior Art Database: 2004-Apr-07

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a controller that addresses problems involved with high resolution image signals when the frequency of data presentation to each actuator element of a printhead is higher than the maximum frequency with which the actuator elements can be effectively actuated. This problem arises when, for example, the sheet speed is so high that data must be presented to the printhead at a rate higher than normal. The disclosed controller is also useful in situations when it is desired to print at a lower than normal resolution (i.e., image resolution), for example, when printing a draft of a letter, while using enough of the image data to preserve high resolution curved or diagonal lines.

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XEROX DISCLOSURE JOURNAL

PRINTER AND CONTROLLER FOR USE WITH A HIGH RESOLUTION IMAGE SIGNAL
Ronald E. Dukes

Proposed Classification
U.S. C1.346/139R Int. C1. Gold 15/16

Jim I. Benjamin

104 NNNNNNNNNNNNNNJ

1 1 1 1 1 1 ~ ~ ~ ~ ~

I 1 2 3 4 5 6 7 8 9 1011 12131415 I

/I4

H2 H4
H6
H8

H10

H12

t

FIG. 7A

(Prior Art)

RES DATA PREV. DATA

INPUT OUT OUTPUT

0 0 0

0 1 0

15OSPI

1O 1 0 1

1 1 0

i:

300 SPI 0 X

0 1 X FIG. 3 1

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcWApril 1994 117

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Page 2 of 12

PRINTER AND CONTROLLER FOR USE WITH A HIGH RESOLUTION IMAGE SIGNAL (Cont'd)

BIT IN OUT SHIFT

SHIFT

IA DATA INPUT

10 \ NNNNNNNNNNNNNNN

1 2 3 4 5 6 7 8 9 101112131415

1 1 1 1 1 1 1 ~ 1 ~ ~ , ~ ~

 H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13

FIG. IB

42 1

/!B

44 m

FIG. 2

- DATA

OUTPUT

118 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcWApril 1994

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Page 3 of 12

PRINTER AND CONTROLLER FOR USE WITH A HIGH RESOLUTION IMAGE SIGNAL (Cont'd)

/20

CUlCT IT m

L

I I I

CPU

LOAD

I MEMORY

f"

MEMORY

(STORES ONE LINE)

LATCH SHIFT REGISTER +

I I

I I I I

I

I

I I

I

I

HIGH /LOW REG.

r-------

LATCH

I

10 DRIVERS

I

FIG. 4

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcNApril 1994 119

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Page 4 of 12

PRINTER AND CONTROLLER FOR USE WITH A HIGH RESOLUTION IMAGE SIGNAL (Cont'd)

120 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcWApril 1994

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

Page 5 of 12

PRINTER AND CONTROLLER FOR USE WITH A HIGH RESOLUTION IMAGE SIGNAL (Cont'd)

Disclosed is a controller that addresses problems involved with high resolution image signals when the frequency of data presentation to each actuator element of a printhead is higher than the maximum frequency with which the actuator elements can be effectively actuated. This problem arises when, for example, the sheet speed is so high that data must be presented to the printhead at a rate higher than normal. The disclosed controller is also useful in situations when it is desired to print at a lower than normal resolution (i.e., image resolution), for example, when printing a draft of a letter, while using enough of the image data to preserve high resolution curved or diagonal lines.

Generally, the thermal ink jet printing process relies on capillary action to force ink refill into each channel after firing of the ink jet. The time required to accomplish firing and refill limits the rate at which a jet may be fired, and thus limits the speed of a print engine. Presently, the process rate of refill is approximately 6000 cycles per second (i.e. 6000 drops per second) for a printhead having a combined burn and refill time of 170uS minimum. Although this is acceptable in many applications, in order to use a thermal ink
.et printhead as a means to add highlighting effects to a centralized engine such as in the Xerox 5090 copier, the ink jet printhead must...