Temperature Sensor

Abstract

The temperature sensor is provided with a pair of lead frames, a sensor portion connected to the pair of lead frames, and an insulating holding portion which is fixed to the pair of lead frames and holds the lead frames. The sensor portion is provided with an insulating film; a thin film thermistor portion formed as a pattern on the surface of the insulating film with a thermistor material; a pair of interdigitated electrodes formed as patterns having multiple comb portions and facing each other on the thin film thermistor portion; and a pair of pattern electrodes connected to the pair of interdigitated electrodes and formed as patterns on the surface of the insulating film. The pair of lead frames is extended and adhered to the surface of the insulating film disposing the thin film thermistor portion therebetween and is connected to the pair of pattern electrodes.

Description

technical field [0001] The present invention relates to a temperature sensor suitable for measuring the temperature of a heating roller of a copier, a printer, etc., and having excellent responsiveness. Background technique [0002] Usually, a temperature sensor is placed in a contact state in order to measure the temperature of a heating roller used in a copier or a printer. As such a temperature sensor, for example, Patent Documents 1 and 2 propose a temperature sensor including: a pair of lead frames; a heat sensitive element arranged and connected between these lead frames; an end portion of the frame; and a film sheet disposed on one side of the lead frame and the thermal element and in contact with the heating roller. [0003] Such a temperature sensor detects temperature by contacting the surface of the heating roller with the elastic force of the lead frame. [0004] In addition, in the above-mentioned Patent Document 1, a spherical thermistor or a chip thermistor ...

AI Technical Summary

Problems solved by technology

[0009] That is, in the technology described in Patent Document 1, a spherical thermistor or the like is used as the thermal element, but in this case, it is spherical or elliptical about 1 mm in shape, and therefore it is difficult to accurately perform point contact with the heating roller. temperature detection of , and has the undesired case of being less responsive due to the volume

Also, due to point contact, there is a possibility of damage to the rotating roller surface

[0010] In addition, in the technology described in Patent Document 2, since a thin film thermistor is used as a heat sensitive element, it can be in surface contact with the heating roller, but if it includes an insulating substrate or a lead part constituting the thin film thermistor, it still has a bulky , so there is a problem of poor responsiveness

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