| (19) |
 |
|
(11) |
EP 0 650 836 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
12.03.1997 Bulletin 1997/11 |
| (43) |
Date of publication A2: |
|
03.05.1995 Bulletin 1995/18 |
| (22) |
Date of filing: 26.10.1994 |
|
| (51) |
International Patent Classification (IPC)6: B41J 2/05 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT |
| (30) |
Priority: |
27.10.1993 US 144069
|
| (71) |
Applicant: Hewlett-Packard Company |
|
Palo Alto,
California 94304 (US) |
|
| (72) |
Inventors: |
|
- Bohorquez, Jaime H.
Escondido,
California 92025 (US)
- Corrigan, George H.
Corvallis,
Oregon 97330 (US)
|
| (74) |
Representative: Madgwick, Paul Roland et al |
|
Ladas & Parry
Altheimer Eck 2
D-80331 München
D-80331 München (DE) |
|
| |
|
| (54) |
Temperature control of thermal ink-jet print heads by using synchronous non-nucleating
pulses |
(57) Method and apparatus for heating a printhead by application of ink firing print pulses
or non-nucleating heating pulses to ink firing resistors (38) during selected print
firing periods wherein either an ink firing print pulse or a heating pulse, but not
both, occurs during a selected print firing period.