The printer generates heat when it is working. You can feel that the body of the printer is very hot, and the printed paper is also hot. Why is this? Since the heat roller keeps rotating when the printer is working, the temperature reaches above 100°C, so the paper just printed is hot.

The temperature that the printer itself can withstand is limited. If the temperature exceeds the temperature that the printer can withstand, the printer will be damaged and unable to work. However, the normal operation of the printer is actually related to the electronic components in the printer. Among the different electronic components related to temperature is the thermistor.

Thermistor

Thermistors are semiconductor resistors, made of semiconductor materials, which are characterized by high sensitivity to temperature. Within a certain temperature range, the resistance will change with the change of temperature, and show different resistance values at different temperatures. .

Just as numbers have positive and negative points, thermistors are also divided into two categories according to temperature: positive temperature coefficient thermistors (PTC) and negative temperature coefficient thermistors (NTC).

Thermistor

The thermistor performs temperature measurement and control in the printer, senses and responds to environmental temperature changes, and controls the working temperature of the print head to avoid damage to the printer due to excessive temperature.

The thermistor is generally on the heat roller of the printer. When the temperature rises, the resistance value increases, and the voltage across the thermistor also increases; when the temperature drops, the resistance value decreases, and the voltage across the thermistor also increases. decrease. The thermistor controls the print head to adjust the paper thickness by measuring the resistance value and voltage change.

In addition to playing an important role in printers, thermistors are also suitable for medical electronics because of their high precision, temperature measurement and temperature control. There are many types of thermistors, and the selection of thermistors should be based on the application.