Thermal sensor assembly
First Claim
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1. A contactless method of detecting temperature of a heated printer roll, the method comprising:
- supporting an infrared sensing thermopile in temperature sensing relation to the heated printer roll, spaced apart from the printer roll; and
maintaining the temperature of the thermopile at a steady temperature despite transmission of heat from the printer roll towards the thermopile by;
providing a heat sink having opposite ends;
housing the thermopile between the opposite ends; and
heating the opposite ends of the heat sink using a first heating element to heat one of the ends of the heat sink and using a second heating element to heat the other end of the heat sink.
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Abstract
An infrared thermal sensor assembly for sensing the temperature of a target, the sensor assembly including a heat sink having a bore therethrough; a thermopile housed in the bore; and a heater operative to heat the heat sink.
28 Citations
27 Claims
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1. A contactless method of detecting temperature of a heated printer roll, the method comprising:
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supporting an infrared sensing thermopile in temperature sensing relation to the heated printer roll, spaced apart from the printer roll; and maintaining the temperature of the thermopile at a steady temperature despite transmission of heat from the printer roll towards the thermopile by; providing a heat sink having opposite ends; housing the thermopile between the opposite ends; and heating the opposite ends of the heat sink using a first heating element to heat one of the ends of the heat sink and using a second heating element to heat the other end of the heat sink. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A contactless method of detecting temperature of an object, the method comprising:
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supporting an infrared sensing thermopile in temperature sensing relation to the object, spaced apart from the object; providing a heat sink having opposite ends; housing the thermopile between the opposite ends; and heating the opposite ends of the heat sink using a first heating element to heat one of the ends of the heat sink and using a second heating element to heat the other end of the heat sink. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A contactless method of detecting temperature of a heated printer roll in an electrostatic printer comprising a frame, a pressure drum supported by the frame for rotation about a first axis, an image drum supported by the frame for rotation about a second axis parallel to the first axis, a fusing drum supported by the frame for rotation about a third axis parallel to the first axis, the fusing drum being, in operation, configured to counter-rotate against the image drum, the pressure drum being, in operation, configured to counter-rotate against the fusing drum, and a toner dispensing assembly supported by the frame and disposed to dispense toner to the image drum, the method comprising:
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supporting an infrared sensing thermopile in temperature sensing relation to one of the drums, spaced apart from the drum; and maintaining the temperature of the thermopile at a steady temperature despite transmission of heat from the drum towards the thermopile, by; providing a heat sink having opposite ends; housing the thermopile between the opposite ends; and heating the opposite ends of the heat sink using a first heating element to heat one of the ends of the heat sink and using a second heating element to heat the other end of the heat sink. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification