Thermosensitive head

Abstract

The invention provides a thermal head in which common drop at a common electrode of turnup structure is corrected easily and uneven print density can be made inconspicuous. The thermal head comprises a plurality of print dot portions, a plurality of discrete electrodes connected with the plurality of print dot portions individually, and a common line extending in the arranging direction of the plurality of print dot portions and applying a common potential to the plurality of print dot portions through feeding points at the opposite ends in the arranging direction. A feeding strip having feeding points at the opposite ends and dot side strips being connected with the plurality of print dot portions are set on the common line. The dot side strips are divided into a plurality of electrically independent blocks in the extending direction of the common line, and each independent block is connected with the feeding strip in the intermediate region of respective independent blocks in the extending direction of the common line.

Description

technical field [0001] The present invention relates to, for example, a thermal head mounted on a thermal copy type printer. 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, by crimping the heating resistor that generates heat through the common electrode and the discrete electrodes to the state that is curled on the ink ribbon and the platen roller. The printing operation is carried out on the printed matter. The common electrode and the discrete electrode are generally respectively connected at both ends of the resistance length direction of the heating resistor, and are arranged in a straight line in the resistance length direction, but it is also proposed to reduce th...

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.

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