Patent USD279727S successfully refreshed from Google Patents.
EP0505154A2
Expired / Lapsed
EP
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Thermal ink jet recording head temperature control
Assignee: Canon Inc
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Filing: 1992-03-18
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Granted: —
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Expires: 2012-03-18
Abstract
Abstract According to this invention, upon execution of recording by ejecting an ink droplet from a recording head, a surrounding temperature sensor for measuring the surrounding temperature is provided to a main body side, and a change in temperature of the head is presumed from the past to the present time by calculation processing, so that optimal temperature control can be performed without arranging a head temperature sensor having a correlation with the head temperature. At this time, the ejection quantity can be stabilized by changing the pulse width of a driving signal on the basis of the presumed head temperature, and ejection can be stabilized by performing restoration processing.
Inventors
- 👤 Naoji C/O Canon Kabushiki Kaisha Otsuka
- 👤 Hiromitsu C/O Canon Kabushiki Kaisha Hirabayashi
- 👤 Kentaro C/O Canon Kabushiki Kaisha Yano
- 👤 Kiichiro C/O Canon Kabushiki Kaisha Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:51
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/045; B41J2/04501; B41J2/04528; B41J2/04531; B41J2/0454; B41J2/04553; B41J2/04563; B41J2/0458; B41J2/04588; B41J2/04591; B41J2/04598; B41J2/135; B41J2/165; B41J2/16517; B41J2/14; B41J2002/14379
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
134 words
A recording apparatus comprising: a recording head for performing a recording operation by ejecting an ink from an ejection port using a heat energy; temperature measurement means for measuring a surrounding temperature; temperature calculation means for calculating a variation in temperature of said recording head on the basis of a thermal time constant of said recording head and an energy supplied to said recording head; presumption means for presuming the temperature of said recording head on the basis of the variation in temperature calculated by said temperature calculation means, and the surrounding temperature measured by said temperature measurement means; and ejection quantity control means for controlling an ink ejection quantity by changing a driving signal to be supplied to said recording head on the basis of the presumed temperature presumed by said presumption means.
Claim 2
Dependent Claim
40 words
An apparatus according to claim 1, wherein the driving signal has a pre-heat pulse and a main heat pulse, and said ejection quantity control means changes a pulse width of the pre-heat pulse on the basis of the presumed temperature.
Claim 3
Dependent Claim
34 words
An apparatus according to claim 1, wherein said recording head causes a change in state in an ink by the heat energy, and ejects the ink on the basis of the change in state.
Claim 4
Dependent Claim
119 words
A recording apparatus comprising: a recording head for performing a recording operation by ejecting an ink from an ejection port using a heat energy; temperature measurement means for measuring a surrounding temperature; temperature calculation means for calculating a variation in temperature of said recording head on the basis of a thermal time constant of said recording head and an energy supplied to said recording head; presumption means for presuming the temperature of said recording head on the basis of the variation in temperature calculated by said temperature calculation means, and the surrounding temperature measured by said temperature measurement means; and ejection stabilization control means for performing ejection stabilization control according to the presumed temperature presumed by said presumption means.
Claim 5
Dependent Claim
27 words
An apparatus according to claim 4, wherein said ejection stabilization control means performs restoration processing of said recording head under a condition according to the presumed temperature.
Claim 6
Dependent Claim
26 words
An apparatus according to claim 4, wherein said ejection stabilization control means performs pre-ejection of said recording head under a condition according to the presumed temperature.
Claim 7
Dependent Claim
27 words
An apparatus according to claim 4, wherein said ejection stabilization control means performs suction restoration of said recording head under a condition according to the presumed temperature.
Claim 8
Dependent Claim
34 words
An apparatus according to claim 4, wherein said recording head causes a change in state in an ink by the heat energy, and ejects the ink on the basis of the change in state.
Claim 9
Dependent Claim
132 words
A recording apparatus comprising: a recording head for performing a recording operation by ejecting an ink from an ejection port using a heat energy; temperature measurement means for measuring a surrounding temperature; temperature calculation means for calculating a variation in temperature of said recording head on the basis of a thermal time constant of said recording head and an energy supplied to said recording head during a reference period; prediction means for predicting a future temperature of said recording head on the basis of the variation in temperature calculated by said temperature calculation means and the surrounding temperature measured by said temperature measurement means; and ejection quantity control means for controlling an ink ejection quantity ejected from the ejection port on the basis of the predicted temperature predicted by said prediction means.
Claim 10
Dependent Claim
30 words
An apparatus according to claim 9, wherein said ejection quantity control means changes a driving signal to be supplied to said recording head on the basis of the predicted temperature.
Claim 11
Dependent Claim
40 words
An apparatus according to claim 10, wherein the driving signal has a pre-heat pulse and a main heat pulse, and said ejection quantity control means changes a pulse width of the pre-heat pulse on the basis of the predicted temperature.
Claim 12
Dependent Claim
72 words
An apparatus according to claim 9, further comprising: head temperature measurement means for measuring a temperature of said recording head; detection means for detecting a difference between the variation in temperature of said recording head calculated by said temperature calculation means, and a variation in temperature of said recording head measured by said head temperature measurement means; and correction means for correcting calculations of said temperature calculation means according to the difference.
Claim 13
Dependent Claim
70 words
An apparatus according to claim 9, further comprising: head temperature measurement means for measuring a temperature of said recording head; detection means for detecting a difference between the head temperature predicted by said prediction means for predicting the future temperature of said recording head, and a head temperature measured by said head temperature measurement means; and correction means for correcting calculations of said temperature calculation means according to the difference.
Claim 14
Dependent Claim
34 words
An apparatus according to claim 9, wherein said recording head causes a change in state in an ink by the heat energy, and ejects the ink on the basis of the change in state.
Claim 15
Dependent Claim
124 words
A recording apparatus comprising: a recording head for performing a recording operation by ejecting an ink from an ejection port using a heat energy; temperature measurement means for measuring a surrounding temperature; temperature calculation means for calculating a variation in temperature of said recording head on the basis of a thermal time constant of said recording head and an energy supplied to said recording head during a reference period; prediction means for predicting a future temperature of said recording head on the basis of the variation in temperature calculated by said temperature calculation means and the surrounding temperature measured by said temperature measurement means; and ejection stabilization control means for performing ejection stabilization control according to the predicted temperature predicted by said prediction means.
Claim 16
Dependent Claim
27 words
An apparatus according to claim 15, wherein said ejection stabilization control means performs restoration processing of said recording head under a condition according to the predicted temperature.
Claim 17
Dependent Claim
26 words
An apparatus according to claim 15, wherein said ejection stabilization control means performs pre-ejection of said recording head under a condition according to the predicted temperature.
Claim 18
Dependent Claim
27 words
An apparatus according to claim 15, wherein said ejection stabilization control means performs suction restoration of said recording head under a condition according to the predicted temperature.
Claim 19
Dependent Claim
27 words
An apparatus according to claim 15, wherein said ejection stabilization control means performs temperature control of said recording head under a condition according to the predicted temperature.
Claim 20
Dependent Claim
72 words
An apparatus according to claim 15, further comprising: head temperature measurement means for measuring a temperature of said recording head; detection means for detecting a difference between the variation in temperature of said recording head calculated by said temperature calculation means, and a variation in temperature of said recording head measured by said head temperature measurement means; and correction means for correcting calculations of said temperature calculation means according to the difference.
Claim 21
Dependent Claim
70 words
An apparatus according to claim 15, further comprising: head temperature measurement means for measuring a temperature of said recording head; detection means for detecting a difference between the head temperature predicted by said prediction means for predicting the future temperature of said recording head, and a head temperature measured by said head temperature measurement means; and correction means for correcting calculations of said temperature calculation means according to the difference.
Claim 22
Dependent Claim
34 words
An apparatus according to claim 15, wherein said recording head causes a change in state in an ink by the heat energy, and ejects the ink on the basis of the change in state.
Claim 23
Dependent Claim
63 words
A recording apparatus comprising: a recording head, which suffers from a variation in temperature according to a thermal time constant thereof upon execution of recording; and temperature calculation means for calculating the variation in temperature of said recording head on the basis of the thermal time constant of said recording head, and an energy supplied to said recording head during a reference period.
Claim 24
Dependent Claim
48 words
An apparatus according to claim 23, further comprising: temperature measurement means for measuring a surrounding temperature; and control means for controlling said recording head on the basis of the surrounding temperature measured by said temperature measurement means, and the variation in temperature calculated by said temperature calculation means.
Claim 25
Dependent Claim
55 words
An apparatus according to claim 23, further comprising: temperature measurement means for measuring a temperature of said recording head; and control means for controlling said recording head on the basis of the head temperature measured by said temperature measurement means during a non-recording period, and the variation in temperature calculated by said temperature calculation means.
Claim 26
Dependent Claim
41 words
An ink ejection recording device which includes a component likely to heat in use, characterised in that the performance of the device is compensated for such heating by a forward prediction in dependence upon the driving signals supplied to the device.
Claim 27
Independent Claim
29 words
A method of operating a recording device comprising predicting a heat varying effect based on the print driving signals giving rise to such heating, and compensating the device therefore.
References Cited (Backward Citations)
No citation records indexed.
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