Thermosensitive head

Abstract

The present invention provides a thermal head capable of easily correcting the common voltage drop on the common electrode of the folded structure, so that the printing density unevenness is not obvious. The thermal head has: a plurality of printed dots; a plurality of discrete electrodes respectively connected to the plurality of printed dots; through the power supply at both ends of the same arrangement direction extending in the arrangement direction of the plurality of printed dots dots to provide a common line of common potential to the plurality of printed dots, and the common line is set with a power supply belt having a power supply point at both ends and a dot side belt connected to a plurality of printed dots. The point side strip is divided into a plurality of electrically independent independent blocks in the extension direction of the common line, and these independent blocks are respectively connected to the power supply strip in the middle area of ​​each independent block in the extension direction of the common line.

Description

technical field [0001] The present invention relates to a thermal head mounted on a thermal copier type printer, for example. technical background [0002] On a substrate with excellent heat dissipation, the thermal head has: a heat storage layer formed of a high heat insulating material such as glass; a plurality of heating resistors that generate heat due to energization; a discrete electrode; and a common electrode that is conductively connected to all the heating resistors, and the heating resistors that generate heat through the common electrode and the discrete electrodes are crimped on the ink ribbon and the platen roller. The printing operation is performed on the printed matter. The common electrode and the discrete electrode are generally connected at both ends of the heating resistor in the length direction of the resistance, and are arranged in a straight line in the length direction of the resistance. However, it has also been proposed to reduce the size of the...

AI Technical Summary

Problems solved by technology

[0006] However, the miniaturization of the (thermal) head and the increase in the area of ​​the common electrode are opposite. If the miniaturization of the head is to be realized, the expansion of the area of ​​the common electrode cannot be ensured. On the contrary, if the area of ​​the common electrode is increased, then ( Thermal) head will be enlarged

Therefore, the common resistance cannot be reduced, and it is difficult to reduce the printing density unevenness caused by the common voltage drop

To make the calorific value of each printed dot uniform, such as described in Patent Documents 1 and 2, it is necessary to adjust the resistance value of the conductive circuit, or to perform complicated external energy control.

Images