JP3497870B2 - Manufacturing method of corner head type thermal head - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] Field of the Invention The present invention is a thermal head, more particularly to manufacturing <br/> manufacturing method of the corner head type thermal head having an improved printing efficiency. 2. Description of the Related Art In a thermal head, it is necessary to concentrate pressure on a ribbon, a paper to be printed, and a platen in a heater area in order to perform printing corresponding to rough paper and to improve printing efficiency. For this reason, a near-edge type thermal head in which a heater region is conventionally provided near an edge of a thermal head is mounted so as to be inclined with respect to a platen.
It has been practiced to concentrate the pressure on the ribbon and the printing paper in the heater area and its vicinity. Such a near-edge type thermal head is disclosed, for example, in Japanese Utility Model Publication No. 4-46929.
The example is shown in FIG. 12 and FIG. FIG. 12 is a sectional view of a near-edge type thermal head, in which a glaze layer 11 is formed on an insulating substrate 10.
Is formed thereon, and the resistive film layer 12, the electrode 14,
15, a protective film 16 is provided. When this thermal head is used, as shown in FIG.
0 is arranged, and the ribbon 31 is pressed against the printing target paper 30 by the thermal head 50 from below. At this time, the thermal head 50 is supported obliquely with respect to the platen 51 by the carriage 52. As shown in FIG. 12, one edge of the glaze layer 11
The inclined surface 18 including the portion is formed to facilitate the passage of the ribbon 31 when the thermal head 50 is inclined. However, the end of the inclined surface 18 on the side of the glaze layer 11, that is, the corner portion does not cover the heater region 13. [0006] In this near-edge type thermal head, the curvature of the heater portion is small and the heater region is not formed so as to straddle the corner portion. Therefore, the inclination angle with respect to the platen 51 cannot be increased, and this angle is at most several degrees. Even less than 10 degrees. For this reason, the concentration of pressure on the ribbon and the paper to be printed could not be so high, the printing efficiency was insufficient, and good printing could not be obtained on rough paper. [0007] In order to solve this problem, a corner head type thermal head in which a heater region is formed so as to straddle the corner portion by forming the above-mentioned corner portion in a glaze layer provided near the edge of the thermal head. Head is used. Such an example is shown in FIG. As can be seen from FIG. 14, the end of the inclined surface 18 on the side of the glaze layer 11 is formed so as to cover the heater region 13, so that the heater region 13 is formed so as to straddle the corner portion. In FIG. 14, a corner head type thermal head 50 is mounted so as to be inclined with respect to a platen 51, and the pressure on the ribbon 31 and the printing paper 30 is concentrated on the heater area 13. In this case, the inclination angle of the corner head type thermal head 50 is
It can be made larger than in the case of a near-edge type thermal head, and can be usually set to about 10 to 35 degrees. Also, the curvature of the heater section can be made larger than that of the near edge type thermal head. For this reason, the concentration of pressure is increased, and the printing efficiency can be improved. [0009] However, this inclined surface 1
8 is a flat surface, so that the side surface of the thermal head and the inclined surface 1
The intersection 20 with 8 has a corner. Further, since the curvature of the heater section is increased, the head is more deeply inserted into the ribbon 31 and the print-receiving paper 30, and the inclination angle is increased.
And so on. For this reason, there has been a problem that the ribbon 31 is slid or cut off due to sliding contact on the intersection 20 and that the paper 30 to be printed is stained by shaving powder of the ribbon 31. Further, even when thermal paper is used as the paper 30 to be printed, there is another problem that the thermal paper slides on the intersection 20 to cause soiling. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a thermal head which does not cause printing stains, ribbon scraping, ribbon breakage, and the like without deteriorating the advantages of a corner head. It is in. [0013] In order to achieve the above object, the invention according to claim 1 of the present application is directed to a corner head type circuit.
A method for manufacturing a multi-head, comprising:
Step of forming a laze layer, and at least the vicinity of the tip is concave
By a cutting blade having a slope formed on a curved surface,
The glaze layer below the peak of the mountain-like glaze layer
And half cut both of the insulating substrate at the same time,
At least near the bottom of the side including the glaze layer is convex
Forming a groove that is a curved surface, the insulating substrate and the
Heat treating the glaze layer; and resisting the glaze layer.
Steps of forming a coating layer, a common electrode, an individual electrode, and a protective film
And a step of cutting the insulating substrate on both side surfaces of the groove.
And a floor . According to the above construction, all or all of the inclined surfaces provided from the top of the mountain-shaped glaze layer of the corner head type thermal head to the side surface on the edge side of the insulating substrate. Since the intersection between the surface and the side surface of the insulating substrate is formed as a convex curved surface, even if the ribbon slides on the inclined surface, the ribbon will not be scraped or cut. Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a first embodiment of the present invention, in which the same members as those of the prior art shown in FIGS. 12, 13 and 14 are denoted by the same reference numerals. In FIG. 1, a glaze layer 11 is formed near an end surface on an insulating substrate 10.
On top of this, a resistive film layer 12 is formed. In this case, the glaze layer 11 has a cross section formed in the shape of a mountain, and the individual electrode 14 and the common electrode 15 are spaced at a certain interval so as to form the heater region 13 at the top of the mountain, that is, at the corner.
Is provided. These resistance film layers 12 and individual electrodes 1
4 and the common electrode 15 are covered with a protective film 16. A feature of the embodiment shown in FIG. 1 is that the inclined surface 1 extends from the top (corner) of the heater region 13 to the above-described side surface 17 on the end surface side of the insulating substrate 10.
8 is formed, and this inclined point 18 is formed as a convex curved surface. FIG. 2 is a sectional view of a second embodiment of the present invention. The same members as those of FIG. A feature of the embodiment shown in FIG. 2 is that an intersection 20 where an inclined surface from the heater region 13 to the side surface 17 of the insulating substrate intersects the side surface 17 is formed as a convex curved surface. It is a point. As described above, in the embodiment shown in FIGS. 1 and 2, the entire inclined surface 18 or the intersection 20 between the inclined surface and the side surface 17 is formed as a convex curved surface. Even when the ribbon is in sliding contact with the portion, the ribbon is not scraped or cut. Next, a method of manufacturing the corner head type thermal head of the above embodiment will be described. 3 to 7 show this manufacturing process. In the step shown in FIG.
A mountain-like glaze layer 11 is formed on the upper surface of the zero. In the step shown in FIG. 4, the glaze layer 11 is moved from the upper surface of the glaze layer 11 toward the insulating substrate 10.
Is partially cut by the blade 25 so as to leave a part thereof. The blade 25 has an inclined portion 26 on a part of the side surface, and the inclined portion 26 is formed in a concave curved surface.
When performing the above-described half cut, the glaze layer 11 is cut by the inclined portion 26. As a result, a groove 21 having a sloped side surface including the glaze layer 11 is formed. The feature of the present embodiment is that the groove 21 formed by the half-cut is formed in the glaze layer 11.
Is formed in a convex curved surface. In the step shown in FIG. 5, a heat treatment is performed on the substrate on which the groove 21 has been formed by the above-described half cut. By this heat treatment, burrs generated on the top portion 22 of the glaze layer 11 by the half cut are removed, and the top portion 22 is rounded. Also, a groove 21 formed by half-cutting
Of the surfaces, the glaze cut part has low smoothness,
The heat treatment described above also improves the surface smoothness. For this reason, subsequent pattern formation becomes easy. Although not shown, the insulating substrate 10 is a large substrate from which a large number of thermal heads can be formed, and a plurality of grooves 21 are formed. In the step shown in FIG.
2. The individual electrode 14 and the common electrode 15 are formed. These are formed in a photolithography process. In this case, the individual electrodes 14 and the common electrode 15 are formed at regular intervals to form the heater region 13 near the top of the glaze layer 11. Further, a protective film 16 is formed to obtain a substrate before division as shown in FIG. Finally, the thermal head is cut and divided along the line AA shown in FIG. 6 to obtain individual thermal heads shown in FIG. By the steps described above, the thermal head is completed. In the method of manufacturing a thermal head according to the present invention described above, the grooves 21 are formed by half-cutting, and after forming a predetermined pattern, individual thermal heads are obtained by cutting or cracking. And at the same time. Although the above embodiment has been described with reference to the case where a partial glaze type substrate is used, the method of manufacturing a thermal head according to the present invention can be applied to a case where a full glaze type substrate is used. . This example is shown in FIG. As shown in FIG. 8A, the entire glaze layer 11 is formed on the insulating substrate 10, and this is half-cut by the above-described blade 25. As a result, as shown in FIG. 8B, a full-glaze type thermal head having an inclined surface whose end is formed in a convex curved surface is formed. Next, in order to manufacture a corner head type thermal head of the type shown in FIG. 2, half cutting may be performed using a blade 25 having a shape as shown in FIG. 9 (a). The inclined portion 26 of the blade 25 is formed by a tip portion 27 formed in a concave curved surface and a linear portion 28. Thereafter, the thermal head shown in FIG. 9B is manufactured through the steps shown in FIGS. 5 to 7 described above. The thermal head shown in FIG. 9B is the same as that shown in FIG. The embodiment shown in FIG. 10 is similar to the embodiment shown in FIG. 2, but the method of forming the intersection 23 is different. In the present embodiment, although not shown, the slope of the blade to be used may be linear, and after forming the slope 18 by the above-described method, the slope 18 and the side face 17 of the insulating substrate 10 are separated. The intersecting portions 23 are polished and chamfered. FIG. 11 shows a printing mechanism of a printer using the thermal head 50 according to the present invention. The printing paper 30 and the ribbon 3 between the glaze layer 11 and the platen 51
1, the printing is performed by the heat generated in the heater area 13. An inclined surface 18 is formed at the end of the thermal head, and the intersection of the entire inclined surface 18 or the inclined surface 18 and the side surface 17 of the insulating substrate 10 is formed as a convex curved surface. Is in sliding contact with a smooth surface, and the scraping or cutting of the ribbon can be prevented. As described above, according to the present invention,
Since the entire inclined surface provided from the top of the mountain-like glaze layer of the thermal head to the side surface on the end surface side of the insulating substrate or the intersection of the inclined surface and the side surface of the insulating substrate is formed as a convex curved surface, Even if the ribbon slides on the inclined surface, the ribbon will not be scraped or cut. As a result,
It is possible to provide a thermal head that does not cause printing stains or the like without impairing the advantages of the corner head.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a first embodiment of a corner head type thermal head according to the present invention. FIG. 2 is a sectional view of a corner head type thermal head according to a second embodiment of the present invention. FIG. 3 is a process chart showing a method of manufacturing the corner head type thermal head in FIG. FIG. 4 is a process chart showing a method for manufacturing the corner head type thermal head in FIG. FIG. 5 is a process chart showing a method for manufacturing the corner head type thermal head in FIG. 1; FIG. 6 is a process chart showing a method of manufacturing the corner head type thermal head in FIG. FIG. 7 is a process chart showing a method for manufacturing the corner head type thermal head in FIG. FIG. 8 is a sectional view of an embodiment of a corner head type thermal head of the entire glaze type according to the present invention. FIG. 9 is an explanatory diagram of a method of manufacturing the corner head type thermal head in FIG. 2; FIG. 10 is a sectional view of a third embodiment of a corner head type thermal head according to the present invention. FIG. 11 is an explanatory diagram of a printing mechanism of a printer using a corner head type thermal head according to the present invention. FIG. 12 is a cross-sectional view of an example of a conventional near-edge thermal head. 13 is an explanatory diagram of a printing mechanism of a printer using the near edge type thermal head in FIG. FIG. 14 is an explanatory view of a printing mechanism of a printer using a conventional corner head type thermal head. DESCRIPTION OF SYMBOLS 10 Insulating substrate 11 Glaze layer 12 Resistive film layer 13 Heater area 14 Individual electrode 15 Common electrode 18 Inclined surface 20 Intersection 25 Blade

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-169247 (JP, A) JP-A-64-61265 (JP, A) JP-A-4-244861 (JP, A) 83652 (JP, A) JP-A-6-8500 (JP, A) JP-A-2-150250 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41J 2/335

Claims (1)

(57) [Claim 1] A step of forming a mountain-shaped glaze layer on an insulating substrate, and a cutting blade having a slope having a concave curved surface at least in the vicinity of the tip. the same both the apex of the glaze layer of the glaze layer and the insulating substrate downward
Sometimes the half-cut, at least the steps of the vicinity of the bottom to form a groove which is convex curved surface, the method comprising annealing the insulating substrate and said glazed layer, resistive film layer on the glaze layer of the side surfaces including the glaze layer Forming a common electrode, an individual electrode, and a protective film; and cutting the insulating substrate on both side surfaces of the groove.