JPS6068972A - Thermal printing head - Google Patents

Abstract

PURPOSE:To enhance printing quality, by a method wherein heating resistors are provided on a main glaze layer, and another glaze layer is provided while setting at least one of the projecting height, the length and the width thereof to be smaller than that of the main glaze layer. CONSTITUTION:A plurality of glaze layers 3, 4 are provided on an insulating substrate 1 while setting at least one of the projecting height, the length and the width of the dummy glaze layer 4 to be smaller than that of the main glaze layer 3. The dummy glaze layer 4 comes into contact with a thermal recording paper 2 only when the paper 2 or the substrate 1 is inclined, thereby preventing the paper 2 from making contact with an edge of the substrate 1, whereby paper scum is prevented from being accumulated, and formation of a lead wire pattern 6 is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the formation of a glaze layer for a thermal printer head.

[Prior art]

A cross-sectional view of is shown in FIG. In this configuration, as is clear from FIG. 3, when the insulating substrate 1 is tilted in the traveling direction, since the glaze layer 3 provided on the insulating substrate 1 is single-phase, the paper contact with the thermal paper 2 becomes poor and printing is interrupted. Quality has deteriorated. In addition, the edges of the insulating substrate 1 sometimes scratched the thermal paper 2. In order to solve this problem, it has been considered to provide a plurality of glaze layers on the insulating substrate 1.

FIG. 4 shows an example of conventional multiple glazes. This is the fourth
As shown in the figure, one dummy glaze layer 4 with the same height and shape as the main glaze layer 3 is provided, and paper waste tends to accumulate in part A of the two glaze spaces, causing paper floating and other problems. The quality deteriorated. Additionally, during manufacturing, there was a problem with the resist coating between the two glazes and the yield.

[Purpose of the invention]

The present invention eliminates these drawbacks and its purpose is to:
This is an improvement in the printing quality of thermal printer heads.

g1 of the invention] The present invention forms two or more glaze layers on an insulating substrate,
A heating resistor is provided on one main glaze layer, and the other glaze layers have a protruding height, length, and rl from the main glaze layer.
This constitutes a thermal printer head in which at least one of the following is formed in a small size.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram of one embodiment according to the present invention.
) is a top view, and (b) is a front view. FIG. 2 is a front view of another embodiment.

In FIG. 1, 1 is an insulating substrate, 2 is thermal paper, 3 is a glaze layer having a heating resistor 5, 4 is a dummy glaze layer, and 6 is a lead wire pattern.

In this embodiment, the dummy glaze layer 4 has a protruding height of 2/3 or less and a length of 1/2 or less, li, compared to the main glaze layer B.
J 1/2 or less. Since the height t of the dummy glaze layer 4 is small, less than 2/3 of the glaze layer 3 having a heating resistor, the dummy glaze layer 4 does not normally come into contact with the thermal paper 2, and the thermal paper 2 or the insulating substrate 1 Contact is made only when the paper is tilted, thereby preventing poor paper contact and preventing contact between the edge of the insulating substrate 1 and the thermal paper 2. In addition, the dummy glaze layer 4 is not in constant contact with the thermal paper 2, and the length of the glaze layer is shorter than 1/2 of the glaze layer 6 of the heating resistor, so paper scraps are formed between the two glaze layers. The dummy glaze layer 4 is arranged as close to the edge of the insulating substrate 1 as possible and its width is made small to facilitate the formation of the lead wire pattern 6 between the glaze layers. .

・In the embodiment shown in FIG. 1, the longitudinal direction of the dummy glaze layer 4 is arranged parallel to the longitudinal direction of the glaze m3 having the heating resistor, but as shown in FIG. Even if the dummy glaze layer is arranged in a direction perpendicular to m3, the same effect as in the embodiment shown in FIG. becomes less. In this case, in order to stabilize the head and prevent it from tilting, two dummy glaze layers 4 are added.
The height of the dummy glaze layer 4 is 2/6 or less of the height of the main glaze layer 3, and the width and length are 1/2 or less. It goes without saying that you can freely choose as long as you do not deviate.

However, according to experiments, the height is 2/3 or less, the width and length are 1/1
The best printing quality was obtained when /2 or less. [Effects of the Invention] As described above, in the present invention, in a thermal printer head in which a plurality of glaze layers are provided on an insulating substrate, one glaze layer is equipped with a heating resistor, and the other glaze layer is formed as a dummy glaze layer, and the height of the dummy glaze layer is formed lower than that of one glaze layer, so that the following effects are obtained. .

1) Since the height of the dummy glaze layer is formed to be lower than the glaze layer having the heating resistor, the dummy glaze layer is usually made of Ir! 3 Contact with thermal paper 7'r? ,
He F + φζIf:S bathing πtF i te4 detective (
Since it has a structure in which eight, two, four, and three layers are in contact with each other, paper scraps will not accumulate between the two glaze layers even during long-term use, and this will ensure that paper scraps, printing errors, and head tilt due to paper scrap accumulation are avoided. This has the advantage that it can be prevented and stable printing quality can be obtained.

2) Since the dummy glaze layer is lower and smaller than the glaze layer having the heating resistor, it is easy to apply the resist, and the yield is high, which is advantageous in manufacturing.

[Brief explanation of drawings]

FIG. 1(α) is a top view of one embodiment of the present invention, and FIG.
) is a front view. FIG. 2 is a front view of another embodiment of the invention. FIG. 3 is a top view of a conventional single glaze layer thermal printer head, and FIG. 4 is a top view of a multiple glaze layer thermal printer head. 1... Insulating substrate 2... Thermal paper 6...
...Glaze layer 4 having a heat generating resistor...Dummy glaze layer 5...Heating resistor 6...Lead wire pattern or more Applicant Epson Corporation Agent Patent attorney Tsutomu Mogami ((Z) (b) Figure 1 Figure 2

Claims (1)

[Claims] In a thermal printer head in which at least two or more glaze layers are formed on an insulating substrate, a heating resistor is provided only on one main glaze layer, and the other glaze layers protrude from the main glaze layer. A thermal printer head characterized in that at least one of height, length, and width is formed small.