JPH0584947A - Production of serial thermal head - Google Patents

Abstract

PURPOSE:To prevent the scaling-up of a serial head and an increase in production. cost, in a case simultaneously producing a plurality of serial thermal heads from one material plate, by avoiding that the height dimensions of the glaze layers of the serial thermal heads become low and non-uniformity is generated in the height dimensions of the glaze layers. CONSTITUTION:When glaze layers 12 are formed to the respective unit substrates 11 of a material plate 10, the glaze layers 12 of two unit substrates 11 mutually adjacent so as to hold a scribe line 13 therebetween are allowed to extend in an almost right-angled direction from the scribe line 13 and the glaze layers 12 of two mutually adjacent unit substrates are formed so as to be shifted in the lateral direction of the glaze layers 12 in a staggered state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plurality of serial type thermal heads used in facsimiles, printers and the like from a single material plate.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a serial type thermal head, a material plate in which a plurality of unit substrates constituting one thermal head are integrally connected is prepared, and each unit substrate is mounted on the surface of the material plate. A strip-shaped glaze layer for each of the unit substrates is continuously formed in a straight line with respect to two adjacent unit substrates, and a plurality of heating elements are formed on the upper surface of the glaze layer. After forming a plurality of electrode bodies to be the heating element on the surface of, the raw material plate is divided into each unit substrate along the scribe line at the boundary of each unit substrate ( For example, JP-A-57-46893). However, in this method, the material plate is divided into each unit substrate, and at the same time, the glaze layer continuously formed on the two adjacent unit substrates is divided into the unit layers when the unit is divided into the glaze layers of both unit substrates. Since a sharp corner or unevenness is formed at the tip of the glaze layer, there are problems such as scratching the printing paper and lowering the durability of the thermal head.

Therefore, Japanese Patent Laid-Open No. 57-1 has been proposed as a prior art.
In the method for manufacturing a serial type thermal head described above, Japanese Patent No. 37172 discloses two unit substrates 2 adjacent to each other among the unit substrates 2 on a material plate 1 as shown in FIG.
In the case of forming the glaze layer 3 with respect to the vertical glance layer 3 without forming the glaze layer 3 continuously between two unit substrates 2 adjacent to each other with the vertical scribing line 4 interposed therebetween, By forming by dividing so as to appropriately open a space of dimension S across 4,
Both ends 3a, 3b of the craze layer 3 in each unit substrate 2
It is proposed to form a round shape as shown in FIG.

[0004]

However, as described above, the two unit substrates 2 adjacent to each other with the vertical scribe line 4 interposed therebetween are provided with an appropriate size S with the vertical scribe line 4 interposed therebetween. In the case of forming the glaze layer 3 by dividing it, the gap dimension S that divides the glaze layer 3
Is made smaller, when the glaze layer 3 is formed by applying a glass paste and then firing and melting, the glaze layers 3 in two adjacent unit substrates 2 are partially melted. Therefore, there is a problem that the height dimension of the glaze layer 3 becomes lower than a predetermined value, or the height dimension of the glaze layer becomes uneven.

Therefore, the gap size S to be divided must be relatively large so as not to be connected to each other during the firing / melting. However, if the gap size S is increased, one end of the glaze layer 3 will be formed. Since the dimension S1 from the portion 3a to the vertical scribe line 4 becomes large, there is a problem in that the unit substrate 2 becomes large, and thus the thermal head becomes large.

In order to avoid the increase in size, the vertical scribe lines between two unit substrates 2 adjacent to each other are set to two vertical scribe lines 4 as shown in FIG.
a and 4b, and these two vertical scribe lines 4
It is conceivable that the glaze layer 3 is formed so as to sandwich a and 4b, but in this case, the width dimension of the material plate 1 is increased by the amount of the two vertical scribe lines 4a and 4b. In addition to this, the material cost is increased, and in addition to this, it is necessary to divide by the two vertical scribe lines 4a and 4b, and the number of steps required for division is increased, so that the manufacturing cost is significantly increased. is there.

It is a technical object of the present invention to provide a method for manufacturing the serial type thermal head without causing the problems of the prior art.

[0008]

In order to achieve this technical object, the present invention provides a strip-shaped glaze layer on each of the upper surfaces of the unit substrates constituting a single material plate. A plurality of heating elements are formed on the upper surface of the glaze layer so as to extend substantially at right angles to the scribe line between two unit substrates adjacent to each other, and then the heat generation is performed on the surface of each unit substrate. After forming a plurality of electrode bodies for the body, in the manufacturing method of dividing the raw material plate along the scribe line between the unit substrates for each unit substrate, glaze on each of the unit substrates In forming the layers, the glaze layers of two unit substrates that are adjacent to each other across the scribe line in each unit substrate are staggered in the width direction of the glaze layers.

[0009]

[Operation] When a glaze layer is formed on each of the unit substrates, the glaze layers of two unit substrates adjacent to each other among the unit substrates are misaligned in the width direction of the glaze layers as in the present invention. When it is formed by shifting the shape like
By melting and firing the glaze layers, both end portions of the glaze layers in each unit substrate can be formed into a rounded shape, and the glaze layers in the two adjacent unit substrates are melted and fired. In this case, preventing the mutual connection is achieved without increasing the size of the unit substrate or forming two scribe lines between two adjacent unit substrates as in the prior art. , Surely achieved.

[0010]

Therefore, according to the present invention, both ends of the glaze layer can be formed in a rounded shape when the serial thermal head is manufactured, but the height of the glaze layer is increased to a predetermined value. In addition, the height of the glaze layer can be made uniform, and further, the serial thermal head can be miniaturized, and further, the manufacturing cost can be prevented from increasing. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of an embodiment according to the present invention will be described below with reference to the drawings. As shown in FIG. 2, a plurality of unit substrates 11 constituting one serial thermal head 20 shown in FIG. 1 are arranged in a plurality of even rows (two rows in this embodiment) and are integrally connected. Prepare a plate, this material plate 10
By using a screen mask (not shown) having a plurality of openings at each of the locations of each unit substrate 11 on the surface of, a glass paste is applied and then baked at an appropriate temperature, As shown in FIG. 3, a band glaze layer 12 is formed.

In this case, the glaze layer 12 in each of the unit substrates 11 is provided vertically between the first column A of the two unit substrate columns A and B and the second column B adjacent thereto. The glaze layers 12 of the unit substrates 11 in the first row A and the second row B, which are adjacent to each other, are formed so as to extend in the longitudinal direction of the vertical scribe line 13 while being formed so as to extend from the scribe line 13 at substantially right angles. By shifting by L, the glaze layer 12 is formed in a staggered manner in the width direction.

As a result, the glaze layer 12 is formed on each unit substrate 11 so that both ends 12a and 12b of the glaze layer 12 are formed into a rounded shape as shown in FIGS. In addition, it is possible to reliably prevent the state glaze layers in each of the two rows of the unit substrates 11 that are adjacent to each other with the vertical scribe line 13 interposed therebetween.

Next, as shown in FIG. 6, the material plate 1
A plurality of heating elements 14 are formed on the upper surface of the glaze layer 12 in each unit substrate 11 of 0, and a plurality of electrode bodies 15 for each heating element 14 are formed on the upper surface of each unit substrate 11. Then, a protective film made of glass or the like is formed on the upper surface of each unit substrate 11. Then, the material plate 10 is divided for each unit substrate 11 along the vertical scribing line 13 and the horizontal scribing line 16 that is perpendicular to the vertical scribing line 13 to obtain a serial thermal head as shown in FIG. You get 20.

In the above embodiment, the unit substrates 11 are manufactured by arranging them in two rows. However, the present invention is not limited to this, and when the unit boards 11 are manufactured by arranging in a plurality of even rows such as four rows or six rows. It goes without saying that it can also be applied to.

[Brief description of drawings]

FIG. 1 is a perspective view of a serial thermal head.

FIG. 2 is a perspective view of a material plate used in an embodiment of the present invention.

FIG. 3 is a perspective view when a glaze layer is formed on each of the unit substrates of the material plate.

4 is an enlarged sectional view taken along line IV-IV of FIG.

5 is an enlarged sectional view taken along line VV of FIG.

FIG. 6 is a perspective view when a heat generating element and an electrode element are formed on each unit substrate of the material plate.

FIG. 7 is a perspective view showing a conventional method.

8 is an enlarged sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a perspective view showing a conventional method.

[Explanation of symbols]

 10 Material Plate 20 Serial Thermal Head 11 Unit Substrate 12 Glaze Layer 13,16 Scribe Line 14 Heating Element 15 Electrode Body

Claims (1)

[Claims] 1. A strip-shaped glaze layer is provided on each of the upper surfaces of the unit substrates that form one material plate, and the band-shaped glaze layer is substantially formed with respect to a scribe line between two unit substrates adjacent to each other among the unit substrates. Formed so as to extend at a right angle, a plurality of heating elements are formed on the upper surface of the glaze layer, and then a plurality of electrode bodies for the heating elements are formed on the surface of each unit substrate, and then the material plate is formed. In the manufacturing method in which the unit substrates are divided along the scribe lines between the unit substrates, a glaze layer is formed on each of the unit substrates, and the scribe lines are sandwiched between the unit substrates. A method for manufacturing a serial-type thermal head, characterized in that the glaze layers of two adjacent unit substrates are formed so as to be staggered in the width direction of the glaze layers.