Patent EP0112474A2 successfully refreshed from Google Patents.
EP0112474A2
Expired / Lapsed
EP
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Thermal print head temperature sensing
Assignee: International Business Machines Corp
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Filing: 1983-11-08
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Granted: —
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Expires: 2003-11-08
Abstract
Abstract In a thermal print head employing a line of print elements, temperature sensing is effected by means of an elongated temperature sensing device positioned in parallel with the line of elements and in heat-transfer proximity thereto. The sensor may be of thermo-resistive material and is coupled to a control circuit to effect energy control of drive pulses to the print elements.
Inventors
- 👤 Richard Gerard Mcclure
- 👤 James Mitchell Rakes
- 👤 Errol Ray Williams
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:47
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/35; B41J2/355; B41J2/36; B41J2/365; B41J2/375
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
39 words
A thermal print head having a row of thermal print elements, characterised by a temperature sensor comprising a sensor bar of temperature sensitive material positioned in parallel with and in heat transfer proximity to, the row of print elements.
Claim 2
Dependent Claim
39 words
A thermal print head having a row of thermal print elements, characterised by a temperature sensor comprising a sensor bar of temperature sensitive material positioned in parallel with and in heat transfer proximity to, the row of print elements.
Claim 3
Dependent Claim
27 words
A print head as claimed in claim 1 in which the length of the sensor bar is substantially equal to that of the row of print elements.
Claim 4
Dependent Claim
44 words
A thermal print head comprising a continuous bar of resistive material, electrical connections to the bar defining print elements therebetween, characterised by a sensor bar of temperature sensitive material positioned in parallel with, and in heat transfer proximity to, the bar of resistive material.
Claim 5
Dependent Claim
44 words
A thermal print head comprising a continuous bar of resistive material, electrical connections to the bar defining print elements therebetween, characterised by a sensor bar of temperature sensitive material positioned in parallel with, and in heat transfer proximity to, the bar of resistive material.
Claim 6
Dependent Claim
19 words
A thermal print head as claimed in claim 3 in which the sensor bar is formed from thermo-resistive material.
Claim 7
Dependent Claim
42 words
A thermal print head as claimed in claim 3 or claim 4 in which the bars are mounted on an electrically insulating substrate carrying leads terminating in said electrical connections and said bar is mounted over, but electrically insulated from, said leads.
Claim 8
Dependent Claim
34 words
A thermal print head as claimed in any of claims 3 to 5 in which the length of the sensor bar is substantially equal to the length of said continuous bar of resistive material.
Claim 9
Dependent Claim
29 words
A thermal print head as claimed in claim 6 including a further pair of leads carried by said substrate and connected respectively to the ends of the sensor bar.
Claim 10
Dependent Claim
72 words
A temperature control system for a thermal print head having a row of thermal print elements, characterised by a temperature sensor bar positioned in parallel with, and in heat transfer proximity to, said row of thermal print heads and a control circuit coupled to the sensor bar and operative to control the energy of print drive pulses applied to the print elements in accordance with the temperature sensed by the sensor element.
Claim 11
Dependent Claim
72 words
A temperature control system for a thermal print head having a row of thermal print elements, characterised by a temperature sensor bar positioned in parallel with, and in heat transfer proximity to, said row of thermal print heads and a control circuit coupled to the sensor bar and operative to control the energy of print drive pulses applied to the print elements in accordance with the temperature sensed by the sensor element.
Claim 12
Dependent Claim
24 words
A temperature control system as claimed in claim 8 in which the control circuit is effective to control the amplitude of said drive pulses.
Claim 13
Dependent Claim
24 words
A temperature control system as claimed in claim 9 in which the control circuit is effective to control the width of said drive pulses.
Claim 14
Dependent Claim
29 words
A temperature control system as claimed in any of claims 8 to 10, in which the lengths of the print element row and the sensor bar are substantially equal.
References Cited (Backward Citations)
No citation records indexed.
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