Hot erasing head for erasing erasable medium and printer thereof

Abstract

The invention discloses an erasing head which comprises a baseplate and a heating body, wherein the heating body is arranged on the baseplate, and a temperature detecting layer is arranged on the heat-transfer path of the heating body transferring heat to a recording medium to be erased. Preferably, an insulating layer and the temperature detecting layer sequentially cover the heat-transfer path of the heating body transferring heat to the recording medium to be erased. Preferably, a protective layer also covers the surface of the temperature detecting layer. Preferably, the insulating layer also extends towards both sides to cover the baseplate except for covering the surface of the heating body. Preferably, the heating body is formed by arranging a plurality of heating points in lines along the length direction of the baseplate. Preferably, the baseplate is a ceramic baseplate, and a glass glaze layer is arranged between the ceramic baseplate and the heating body. Meanwhile, the invention provides a printer applicable to the technical scheme. Compared with the prior art, the temperature detection resistance of the erasing head provided by the invention can accurately reflect the target temperature to be measured.

Description

technical field [0001] The invention relates to information recording equipment, in particular to a thermal erasing head for erasing rewritable media. The present invention also relates to a printer with the above-mentioned thermal erasing head. Background technique [0002] With the improvement of environmental protection awareness and recycling awareness, rewritable media that can repeatedly write and erase information are more and more widely used. For these rewritable media, two operations can be performed: writing and erasing. The former operation records the required information on the recording medium, and the latter operation erases the information already written on the recording medium. [0003] A typical rewritable medium is a thermally rewritable recording medium including a substrate and a thermally reversible recording layer (recording layer for short). The rewritable medium is generally called rewritable card or rewritable paper according to different substr...

AI Technical Summary

Problems solved by technology

[0009] The disadvantage of the above-mentioned erasing head is that there is a certain distance between the temperature detection resistor 03 and the heating element 02, and there is also a certain distance between the recording medium, and the two are not in the same direction

Like this, the temperature of temperature detecting resistor 03 and the temperature of heating element 02, the temperature of recording medium all have difference, and this just makes the detection temperature of temperature detecting resistor 03 and actual heating temperature have error, and the range of this error will be due to specific product technology There are obvious differences due to the discreteness of parameters, and it is not easy to compensate for errors

In addition, since it takes time for the temperature change of the heating element 02 to be transmitted to the temperature detection resistor 03, the detection result of the temperature detection resistor 03 lags behind the actual temperature of the heating element 02 obviously.

The above shortcomings all affect the effect of the erase operation

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