JPS58151265A - Manufacture of heat sensitive recording head - Google Patents

Abstract

PURPOSE:To eliminate the degradation of heat conduction efficiency from a heating body to a heat sensitive recording body and the dispersion and the like in resistance values, by applying an abrasion resistance layer to the part other than the position where a heating resistance layer is to be arranged, before the heating resistance layer is applied to an insulating substrate. CONSTITUTION:For example, a desired conductive pattern 2 is formed on an Al2O3 substrate 1 by the screen printing and the like of the conductor of Au, Ag-Pd, and the like. The abrasion resistance material 4 such as glass is formed at the part other than the heat resistance body part by a means such as screen printing. Then drying and burning are performed. Then the resistance body 3 such as RuO2 is formed in a gap space formed in the previous process by using a means such as the screen printing. At this time, it is recommended that the height of the abrasion resistance layer becomes the same as the height of the exposed central part of the heating resistance body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for forming a dot image using an electric pulse λ signal from a printer, etc. The present invention relates to a method of manufacturing a thick film thermal recording head that converts heat into heat and performs thermal printing on thermal recording paper or the like.

The thermal recording head used in conventional serial printers, etc. presses the heat generating part 3 of the thermal recording head and the thermal recording medium 5 in order to print thermally on the thermal recording medium and visualize it. The pressure is applied by means of pressure means 6 (see Fig. 1). At this time, since there is friction between the heat generating part 5 and the heat-sensitive recording medium 5, it is common to use a thermal recording head in which the heat generating part is protected by a wear-resistant layer 4. In addition to abrasion resistance, the material for the wear-resistant layer of a thermal recording head with such a configuration has low thermal conductivity in the direction parallel to the heat-generating part to improve printing quality, and heat-generating resistance during the manufacturing process because it comes into contact with the heat-generating resistor. Compatibility with the body is required. As a material that almost satisfies these requirements, Gala XII#P is used in a thickness of about 10p. However, in such conventional technology, [F]
Providing a wear-resistant layer reduces the efficiency of heat transfer from the heating element to the heat-sensitive recording medium. - Compatibility with the heating resistor varies depending on the material (composition) of the resistor. - Firing the resistor After finishing, the wear-resistant layer is further fired, so the resistance layer is fired twice, which changes the resistance value.

In addition, as shown in FIG. 5, there is a drawback that the width of the heating resistor becomes uneven due to the difference in wetting of the paste to the substrate and the electrode, and the resistance value varies depending on the location.

The object of the present invention is to provide a new thermal recording head which eliminates all of the drawbacks mentioned above.

That is, the present invention provides a structure of a thermal recording head in which the heat-generating portion and the heat-sensitive recording material can come into contact with each other throughout the entire body without covering the entire surface of the heat-generating portion of the thermal recording head with an abrasion-resistant layer. Accordingly, a thermal recording head with high heat conduction efficiency can be obtained in which the heating element and the thermal recording medium can be brought into direct contact without wearing out the heating resistor.

Another object of the present invention is to provide a thermal recording head that can reduce variations in resistance values due to differences in mutuality by reducing the contact area between the wear-resistant material and the heating resistor. , 7+)) 2) Another object of the present invention is to suppress the change in resistance of the heating resistor due to twice firing by disposing the wear-resistant material before disposing the heating resistor. be.

A further object of the present invention is to adjust the shape of the heating resistor.

Figure 2 is a sectional view of a thermal recording head according to an embodiment of the present invention. 96 arcs! ! A desired conductor pattern 2 is formed on a conductor such as M, U or Mg-Pd on a substrate 1 by starne printing, or a sinterable thin film conductor is applied to the substrate by vacuum evaporation or sputtering, and then a photopattering process is performed to form a desired conductor pattern 2. A wear-resistant material 3, such as glass, is formed thereon using screen printing means at a position excluding the heating resistor portion, and then dried and fired.
A resistor 3 such as 1tio is formed in the knee space formed in the previous step using a method such as screen printing. At this time, it is preferable that the heights of the wear-resistant layer and the exposed central portion of the heating resistor are the same.

3rd wj is a cross-sectional view of the thermal head according to the present invention in a state of use, in which the recording paper 5 is pressed against the heating resistor 6 by the pressing roller 6.
However, since the heating resistor 6 has sufficient hardness and the hardness of the wear-resistant material 4 surrounding the heating resistor is higher than that of the resistor 3, wear of the heating resistor is prevented. , it's hardly a problem.

Figure 4 shows the thermal head according to the present invention, seen from above.
wJ (however, the board is omitted) When a conductor (electrode) 2 such as MUU and a resistor paste 6 such as 02 are printed in a straight line on the substrate, the difference in 1 wettability of the paste is Therefore, in this embodiment, a wear-resistant material is provided before the resistor is installed in the machine described above and shown in the figure, so that the swelling of the heating element can be suppressed and the resistance can be reduced to almost a flop. It is also advantageous in terms of variation in values.

In this way, in the past, a wear-resistant material was placed over the entire surface of the heating resistor after the heating resistor was placed, but in the present invention, the resistor was first placed before the heating resistor was placed. Abrasion-resistant material is placed in areas other than where it should be placed, and then
Placing the heating resistor at a defined location provides many benefits, including: By exposing the heat-generating part of the resistor so that the heat-generating element and the heat-sensitive recording material come into direct contact, the heat conduction efficiency is increased and the pressing force can be reduced.
6. The input for heating can be made small. 8. Since the firing of the heating resistor is the last firing, I
1) Changes in resistance value due to several firings t, a can be removed 1) The shape of the heating resistor can be adjusted, thereby suppressing variations in resistance value. Since the contact area is small, the thermal stress on the heating element is reduced, resulting in a longer life.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a part where thermal recording is performed on a thermal recording medium by a conventional thermal recording head, FIG. 2 is a cross-sectional view of a thermal recording head of the present invention, and FIG. 4 is a perspective view of a part of the heat generating part of the thermal recording head of the present invention, seen from above; FIG. 5 is a cross-sectional view of the heat generating part of the conventional thermal recording head when forming the heat generating part. A top view showing the state of the figure. 1. Insulating group & 2. Conductor

Claims (1)

[Claims] In a thermal recording head comprising a conductor, a heat-generating resistor layer, and a wear-resistant layer on an insulating substrate, the wear-resistant layer is coated with the heat-generating layer before forming the heat-generating resistor layer on the insulating substrate. A method for heating a thermal recording head, characterized in that the resistor layer is applied to a portion other than a position where a resistor layer is to be provided.