JP2819739B2 - Method for manufacturing glaze ceramics substrate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a glaze ceramic substrate used for a thermal head, and more particularly, to a portion having good heat dissipation and having a partially convex portion and a glaze layer. The present invention relates to a method for manufacturing a partially convex glaze ceramic substrate that can be co-fired.

2. Description of the Related Art A glaze ceramic substrate in which a glass layer is coated on a ceramic substrate is widely used as an electronic circuit substrate such as a substrate for a thermal printer head.

In recent years, high performance products such as high printing quality and high-speed printing have been demanded for thermal printer heads, and as a result, partially convex glazed ceramics substrates with convex portions at the locations where heating elements are formed have been used. The printing characteristics were improved compared to the flat type.

[Problems to be Solved by the Invention] However, in the partially convex glaze ceramic substrate, a partially convex glaze ceramic substrate is formed with only glass on a smooth ceramic substrate, and the glass has low thermal conductivity. The heat from the heating element formed on the convex portion tends to accumulate, and therefore, if the printing speed is further increased, there is a problem that the printing quality is deteriorated.

Therefore, the present inventors examined the above problems in various ways, and mixed ceramics having a higher thermal conductivity than glass into the inside of the partially convex portion in order to enhance heat dissipation and respond to high-speed printing. It has been found that the properties can be improved, and a portion having a partially convex portion and a glaze layer can be simultaneously fired, and the present invention has been completed based on this.

Accordingly, an object of the present invention is to provide a partially convex glaze ceramic substrate that solves the conventional problems as described above, has good heat dissipation, and can simultaneously bake a partially convex portion and a glaze layer. It is to provide a manufacturing method.

[Means for Solving the Problems] The object of the present invention is to provide at least one surface of a smooth ceramic substrate with a mixture of a ceramic powder and a glass powder of the same or a different material as the material of the substrate to partially apply a convex portion. After the glass powder is applied to the entire surface on which the partial convexity is formed, the internal glass-ceramic part and the glaze layer on the surface are simultaneously fired to produce a partially convex glaze ceramic substrate. Achieved by the method.

[Specific Configuration of the Invention] In the present invention, in order to enhance heat dissipation and support high-speed printing, ceramics having better thermal conductivity than glass are mixed as a filler into the inside of a partial convex formed only of conventional glass, and a By forming only the glaze layer, it is possible to simultaneously improve the heat dissipation of the partially convex portion and simultaneously fire the internal glass-ceramics portion and the glaze portion on the surface, and thus have an effect of simplifying the manufacturing method.

As the glass powder of the glaze material used in the present invention, one that satisfies both the insulating property and the heat resistance (softening temperature of 800 ° C. or more) required for the thermal printer head is used, and preferably Al ₂ O ₃ —BaO—B ₂ those O ₃ -CaO-SiO ₂ based glass is used.

For the application of the glass powder, an appropriate application means such as printing or spraying is used.

As the ceramic used as the filler, for example, alumina powder, aluminum nitride, and silicon carbide are used.

In the present invention, the mixing ratio between the glass powder and the alumina powder is arbitrarily mixed within a range of 7: 3 to 3: 7.

The width, height, and R shape of the partial protrusion can be arbitrarily changed by adjusting the printing width, the paste viscosity, the number of printings, or the like, or adjusting the thickness of the surface glaze layer in the printing of the glass-alumina portion. .

The method for manufacturing a partially convex glaze ceramic substrate of the present invention will be described with reference to FIG. 1. A mixed powder of glass and ceramic is applied to at least a portion of a smooth ceramic substrate that is to be partially convex (FIG. 1a). ).

Next, glass powder is applied to the entire surface of the substrate having the same surface and a partial protrusion (FIG. 1B).

As a means for applying the mixed powder of glass and ceramic and the glass powder, an arbitrary method such as a printing method or a spray method is used.

After each powder is applied, firing is performed at the firing temperature of the glass (FIG. 1c).

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

As shown in FIG. 1, 96 mm of 50 mm × 270 mm and 1 mm thick
% Polished alumina substrate 1 on one side, glass powder (Al ₂ O ₃ —Ba ₂ O ₃ —B ₂ O ₃ —CaO—SiO ₂ based glass powder) and alumina powder (low soda alumina): The mixture was mixed at a weight ratio of 1 and a paste prepared by adding 2 g of a binder and 18 g of a solvent to 100 g of the mixture was printed by a printing method at a portion where a partial convex 2 was to be formed (FIG. 1a).

Then, after the partial projections 2 were dried, 100 g of glass powder having the same composition as above was mixed with 2 g of a binder and 18 g of a solvent to prepare a glass powder paste 3.

The paste 3 was printed on the entire surface on which the partial protrusion was formed (FIG. 1B).

After the coating had dried, it was fired at 1200 ° C. (FIG. 1C). The glaze surface 4 obtained by firing was very smooth and free of defects.

[Effects of the Invention] In the present invention, since a partial convex is formed from a mixture of a ceramic powder and a glass powder, the heat radiation is good, the partial convex and the glaze can be simultaneously fired, and the manufacturing method is simplified. effective.

[Brief description of the drawings]

1 (a) to 1 (c) are schematic cross-sectional views showing the order of manufacturing a partially convex glaze ceramic substrate of the present invention. DESCRIPTION OF SYMBOLS 1... Ceramic substrate 2... Partially convex 3... Paste 4... Glaze surface 5.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-83477 (JP, A) JP-A-62-153178 (JP, A) JP-A-2-1644782 (JP, A) 155139 (JP, U) Japanese Utility Model Showa 58-60458 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B41J 2/335

Claims (1)

(57) [Claims] At least one surface of a smooth ceramic substrate is partially coated with a mixture of a ceramic powder and a glass powder of the same or different material as the material of the substrate to form a partial convex, and then the entire surface on which the partial convex is formed. A method of manufacturing a partially convex glaze ceramic substrate, comprising: applying a glass powder to the glass substrate, and simultaneously firing the internal glass-ceramic portion and the glaze layer on the surface.