JPH05286155A - End face type thermal head - Google Patents

Abstract

PURPOSE:To increase the area of the heating resistor part of an end face type thermal head by a simple means. CONSTITUTION:A substrate part A is constituted in such a manner that an independent electrode 3 and a common electrode 5 are formed on the flat surface of a substrate 1 with an underglaze 2 thereon, a heating resistor 6 is formed between the electrodes, and a surface formed by cutting through the heating resistor 6 and each electrode is used as a printing surface. The substrate part A and a substrate part B obtained by cutting the front end vertically are stuck together so that they are superimposed. By superimposing the substrate parts A and B, an end face type thermal head having a heating part which is twice as large in area as it was can be easily obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end face type thermal head.

[0002]

2. Description of the Related Art An end face type thermal head having a heating resistor formed on the end face of a substrate can print on a hard-to-bend print medium such as a hard card because the facing part to the platen can be used as a heating element part. A possible thermal printer can be easily realized.

Conventionally, as a method of forming a heating resistor on the end face of a substrate, a method of forming an electrode on the end face by vapor deposition / photolithography and printing a resistor on the electrode has been generally used.
However, a special mask and complicated steps are required for vapor deposition and etching on this end face.

In order to solve the above-mentioned problems, the inventors of the present application previously disclosed, in Japanese Patent Application No. 3-188273, to form electrodes and resistors by a printing method on the flat surface side of a substrate, and place them directly above the resistors. We have proposed an end-face type thermal head whose cross section is a cart sliding surface by cutting the substrate.
In addition, at that time, in order to print at an appropriate printing speed on the card, the area of the heating element in the cross section must be equal to or larger than the maximum film thickness that can be formed by the printing method. We have also proposed a thermal head with a structure that increases the temperature.

FIG. 5 shows the end face type thermal head proposed above. The above-mentioned end surface type thermal head includes a substrate 1 and a substrate plane 1b that intersects the end surface 1a along the end surface 1a.
The underglaze 2 formed above, the common electrode 5 insulated by the individual electrode 3 and the insulating film 4, the heat generating resistor 6, and the overglaze 7 covering the heat generating resistor 6 and the electrodes 3 and 5, The common electrodes 5 and the individual electrodes 3 are alternately arranged in a comb shape, and the heating resistors 6 are filled between them, and the heating resistors 6 and the lateral cut surfaces 8 of the electrodes 3 and 5 are obliquely cut. This is a structure in which the cut surface is covered with overglaze.

[0006]

In the above-proposed edge-type thermal head, the cross-sectional area of the heating resistor is increased by cutting the substrate diagonally. There is a problem that it is necessary to make the angle acute, there is a difficulty and a limit in the processing surface, and when the substrate is cut obliquely, the tip of the substrate becomes fragile and chips or the like are likely to occur.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a thermal head of the above-mentioned end face type thermal head which can increase the cross-sectional area without cutting the substrate obliquely.

[0008]

According to the present invention, a substrate, an underglaze laminated on a plane of the substrate intersecting the substrate along an end face of the substrate, an individual electrode, a common electrode, a heating resistor, and It consists of a heating resistor and an overglaze that covers each electrode and an overglaze that covers these end faces. The individual electrodes and the common electrode are alternately arranged in a comb shape, and the heating resistor is filled between them. Then, the gist is that the area of the heating resistor is enlarged by superimposing two substrate portions where the cut surfaces of the heating resistor and the electrodes are used as the printing surface.

[0009]

As described above, when two substrates having the same structure are superposed on each other, a sliding surface having a heating resistance portion having a double area is formed.

[0010]

FIG. 1 shows an end surface type thermal head according to an embodiment of the present invention. In the figure, the same or similar members as those in FIG. 5 are designated by the same reference numerals.

In FIG. 1, A and B are substrate portions having the same structure, 1 is a ceramic substrate, 2 is an underglaze,
Reference numeral 3 is an individual electrode, 4 is an insulating film, 5 is a common electrode, and 6 is a heating resistor. Both the substrate parts A and B are integrated by bonding the electrodes and the heating resistor to each other. Has been converted. The manufacturing procedure of the thermal head configured as described above will be described with reference to FIGS.

First, as shown in FIG. 2, individual electrodes 3 are formed on the flat surface of the ceramic substrate on which the underglaze 2 is formed by pressure film printing-firing-photolithography and patterning, and an insulating film 4 is formed by overprinting.

Next, as shown in FIG. 3, the common electrode 5 is formed in the same manner as the individual electrode. Next, as shown in FIG. 4, the heating resistors 6 are formed on the tip ends of the individual electrodes 3 and the common electrode 5 by overlapping printing and firing. After that, the substrate is cut in the vertical direction on the heating resistor 6, the two cut substrates are attached to each other so that the electrodes overlap each other, the end faces are polished and flattened, and the overglaze layer is printed on the cut face. -By forming by firing, the end surface type thermal head of FIG. 1 is obtained.

As described above, when the substrates are bonded together, a sliding surface having a heating element having an area twice that of the sliding surface is formed. Note that the two substrates may be manufactured separately. It is also possible to cut the stacked substrates slightly diagonally to increase the cross-sectional area. Furthermore, the cutting may be performed after the two substrates are bonded together.

[0015]

As is apparent from the above description, according to the present invention, since the area of the heat generating portion is increased by stacking two substrates, it is possible to improve the construction method compared to the case where the substrates are cut diagonally. An end face type thermal head that is simple, easy to obtain strength, and resistant to chipping and the like can be easily configured. Further, from this, it is possible to simplify the manufacturing process of the end surface type thermal head, improve the yield, and reduce the cost.

[Brief description of drawings]

FIG. 1 is a perspective view of an end surface type thermal head showing an embodiment of the present invention.

FIG. 2 is a perspective view of a head structure portion showing a manufacturing procedure of the end surface type thermal head.

FIG. 3 is a perspective view of a head structure portion showing a manufacturing procedure.

FIG. 4 is a perspective view of a head structure portion showing a manufacturing procedure.

FIG. 5 is a perspective view of an end surface type thermal head of the invention of the prior application.

[Explanation of symbols]

 1 Substrate 2 Underglaze 3 Individual Electrode 4 Insulating Film 5 Common Electrode 6 Heating Resistor 7 Overglaze 8 Cross Section A, B Substrate

Claims (1)

[Claims] 1. A substrate, an underglaze laminated on a plane of the substrate intersecting with the substrate along an end face of the substrate, an individual electrode and a common electrode, a heating resistor, and the heating resistor and each electrode are covered. The above-mentioned individual electrodes and common electrodes are alternately arranged in a comb shape and filled with a heating resistor between them, and the heating resistor and the above-mentioned heating resistor are provided. An end face type thermal head characterized in that the area of a heating resistor is enlarged by stacking two substrate portions where the cut surface of each electrode is the printed surface.