JPH03272870A - Thick film type thermal head - Google Patents

Abstract

PURPOSE:To accurately reduce a size in a dot printing direction by so disposing part of a heat generating resistor in a lateral direction as to be placed on a reinforcing pattern. CONSTITUTION:A reinforcing pattern 5 is superposed to be formed on a common electrode 4, and the side edge 5a of the pattern 5 reaches the vicinity of the side edge 4b of the common electrode. A heat generating resistor 7 is so formed as to be superposed on the pattern 5 at its part w2. The resistor 7 is formed by printing resistor paste containing resistance component such as luthenium oxide, etc., and baking it. In a thick film type thermal head 1, the effective part 7a of the resistor 7 generates heat. The accuracy of the part 7a is decided first according to the accuracy of the side edge 7c of the resistor 7 and second according to separation of the part 7a and ineffective part 7b of the resistor 7. Since the pattern 5 has a thickness of about 3mum, part disposed on the edge 5a is extremely reduced in thickness. Thus, separation of the part 7a and the part 7b is clarified. Accordingly, the accuracy of the part 7a is sufficiently obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention is characterized by 5. r! The L film is related to thermal heads.

(1: ff) Conventional technology No. 2] (a) (b) shows a conventional thick-film type Thermaru. Reference numeral 12 denotes a substrate 1 made of ceramic or the like, and a glass glaze layer 13 is formed on its surface 12a. On this glass glaze layer 13, a common electrode 14 and individual electrodes 16, . . . , 16 are formed.

The common electrode 14 is arranged in a direction perpendicular to the printing direction F [Fig.
a) in the vertical direction of the paper, and in FIG.
14a protrude along the printing direction F at predetermined intervals. Furthermore, a reinforcing pattern 15 is formed over the top of the common electrode 14.

The common electrode tip portions 14a, . . . 14a are arranged to mesh with the individual electrode tip portions 16a, . . . 16a alternately. These electrode tips 14a, 16a,...
・ 16a, 14a upper number, band-shaped heating resistor 17,
It is formed parallel to the reinforcing pattern 15.

This heating resistor 17 is formed by screen printing a resistor base on the glaze J common electrode 3 and firing it. A portion of the heating resistor 17 sandwiched between the adjacent common electrode tip portions 14a, 14a corresponds to one dot.

The common electrode 14, the reinforcing pattern 15, the individual electrodes 6, and the heating resistor 17 are covered with a wear-resistant layer 18 for insulation protection.

(c) Problems to be solved by the invention In recent years, in order to clarify printing, the width of the number heating resistor 17 has been reduced as shown in Figures 1 and 3 (, C).
)), the dimension of the printing force direction F of the 1st point I) is set to 1/2 of the conventional size, and the element is divided into two times.
7 methods of developing color have been proposed. For this purpose,
The width W of the heating resistor 170, which was conventionally about 250 μm, was reduced to 1
There is a polished tube with a diameter of about 6.00 μm.

By the way, the screen used when printing resistor paste is made of stainless steel wire S, and a wire of about 400 mesh is often used (see Figure 4). The diameter of the wire S is 23 μm, the center-to-center distance l is 63 μm, and the opening Sa is 40×40
L5 is less than about μm, and with respect to the radius w' of the heat generating resistor 17, two or less openings SaL are close to each other or not. Yo~, Te1. There was a problem that the resistor base was not easily removed and the heating resistor 17 could not be precisely patterned.

As an alternative to this, it has also been considered to apply a direct writing method. This direct drawing method is a method in which pressure is applied to the resistor paste, the paste is extruded from the tip of the nozzle, and a pattern is drawn directly. However, the direct writing method is time consuming and requires strict pressure control.
, 9: Using a common electrode has the problems of significantly lower productivity and high equipment cost. was.

This invention consists of 1. This was developed in view of the above, and the purpose is to provide a thick-film type ZERFLOW/GROOT that can accurately reduce the size of the I method in the tod printing direction.

Section R'E Means for Solving In order to solve the above problems, the thick film wall plate of the present invention forms a glaze layer on the substrate L7, and the glaze layer F: An individual electrode and a common electrode are formed on the common electrode, and on this common electrode, a reinforcing pattern extending in the direction 1i+J that intersects 0 in the printing nozzle direction is overlaid and formed, and the tip of the individual electrode and the tip of the common electrode are formed. Part 61 is arranged so as to mesh with the common electrode, and a band-shaped heating resistor is formed in parallel with the reinforcing pattern.2, the individual electrode, the common electrode, the reinforcing pattern and The heating resistor is coated with a wear-resistant layer and 5/
: In addition, part (7) is characterized in that a part of the heating resistor R in the radiation direction is arranged so as to overlap the reinforcing pattern.

(E) Function In the thick-film type thermal head of the present invention, the entire bottom surface of the heating resistor that overlaps with the reinforcing pattern is in contact with the reinforcing pattern t:, so the current and density are small and almost no heat is generated. )-shi7 no. Therefore, even if the width of the heating resistor remains large, by adjusting the (f method) of the part that overlaps the reinforcing pattern, the part that contributes to heat generation (effective part) can be adjusted.
The width of the heating resistor itself can be set small, and the same effect as that of reducing the width of the heating resistor itself can be obtained.

The precision of the side edge of the effective axis of the iron is determined by the precision of forming the heating resistor itself. However, since the width of the heating resistor itself may be large, sufficient accuracy can be obtained even with screen printing.

The accuracy of the other side edge of the effective part is 5, which depends on the reinforcement pattern of the heating resistor -hx: "4" depending on the separation of the heavy part and the non-heavy part. By the way, the reinforcing pattern is usually formed with a considerable thickness for the purpose of reducing the voltage drop F of the common electrode. Separation is ensured by sufficient force. Sub 2. Therefore, the accuracy of the effective part of the heating resistor 14 is as good as it gets.

(-・,)Example This example will be described below based on FIG. 1.

FIG. 1(a) is a diagram illustrating the manufacturing lid of the electrode and heating resistor of the single-film thermal head 1 according to this embodiment.
Figure (b) is a cross-sectional view of the main part of the same-thickness demolding tool 1.

2 is a substrate made of aluminous ceramic or the like. On the surface 2a of this substrate 2,. Amorphous glass paste is printed and burnt out to form glass glue I, . . . N3. This moth acts as a heat storage layer.

After three layers of glass glaze, gold (A, U) paste is printed and burned to form a conductor film (not shown). This conductive film is applied with photolithography to form a common electrode 4, individual electrodes 6, and
... is considered to be 6.

The common electrode 6 extends in a direction 1 perpendicular to the printing direction F, that is, in a first direction (a) in the vertical direction of the paper surface, and in FIG. 1) in the paper surface loading direction. Side edge 4 of common electrode 4
bJ,! Q is the common electrode tip 4 at a predetermined interval.
a,... 4a, are prominent. Between these common electrode tips 4a, 4a, the tip 6a of the individual electrode 6 is located at position j.
7. [See Figure 1(a)].

A reinforcing pattern 5 is formed on the common electrode 4 in an overlapping manner. This reinforcing pattern 5 is also printed and fired with a gold base 1. It reaches near the common electrode side edge 4b.

The reinforcing pattern 5 is for reducing the electric current drop F of the common electrode 4, and is formed to be thicker than the common electrode 4, for example, about 3 μm.

The heating resistor 7 is formed so that a portion W2 thereof overlaps the reinforcing batten 5. The heating resistor 7 is made by printing a resistor paste containing a resistive component such as ruwonium oxide and burning it. The heating resistor 7 is formed with a conventional IMW of 250 μm, for example, and if the width W of the effective portion 7a is the common electrode 001j, the width W of the portion 7b overlapping on the reinforcing pattern b is ,teeth,
250-100 (w-w,) and 150μmc! Become.

The heating resistor 7, the individual electrodes 6, the reinforcing pattern b, and the common electrode 4 are further covered with a protective glass layer 8 to provide insulation protection. This protective glass layer 8 is also made by printing amorphous glass and baking it.

In the thick-film thermal head 1 of this embodiment, the effective portion 7a of the heating resistor 7 generates heat as shown by diagonal lines 1 and 1 in FIG. 1(a). Therefore, the color develops on the thermal recording paper 1 (the printing direction of the print, j' direction, is about 100 μm).

The accuracy of the effective portion 7a depends on the accuracy of the side edge 7C of the heating resistor 7, and the separation of the effective portion 7a and the non-effective portion 71) of the heating resistor 7. It is decided by Oko.

The accuracy of the heating resistor side edge 7c can be ensured by screen printing, since the width W of the heating resistor tR and the width W of the body 'l itself is about 250 .mu.m, as in the conventional case.

Further, since the reinforcing pattern 5 has a thickness of 3 μm P;
The portion located at a, , U becomes extremely thin.

Therefore, the valid part 7a, :invalid part/, ), 7
There is a clear separation from b. Therefore, the accuracy of the effective portion '7a is sufficiently ensured.

(1.) As described in detail, the thermal head of the present invention is characterized in that a part of the heating resistor in the width direction is arranged so as to overlap with the reinforcing pattern. Therefore, it has the advantage that even if the heating resistor is formed by screen printing, the size of the dots in the printing direction can be reduced with high accuracy.

4. Common electrode il] A simple explanation of the common electrode Fig. 1 (a
) are Embodiment G of the present invention, 2 is a diagram explaining the arrangement of the electrodes and heating resistor of the thick film type Fluorrad, and 1st
Figure (1)) is a cross-sectional view of the chamber of the same thick film model -=-Full \RAD, and Figure 2 (a) is a conventional one-thickness model Ri-Full.
A diagram illustrating the arrangement of the electrodes and heating resistor of So1-,
The second I (+) is the same conventional thick film type
Figure 3 (a) is a cross-sectional view of the main part of ゛. FIG. 4(b) is a diagram showing a lid printed with the same thick film type thermal rad, and FIG. 4 is a diagram illustrating a screen used for printing the resistor paste.

2:′j! 5. Board, 3: Glass gel L/-z layer,
4: Common electrode, 4a: Common electrode tip, 5: Reinforcement pattern, 5a: Reinforced baton side edge, 6: Individual electrode, 6a Two-side electrode tip, two heating resistors, : Protective glass layer .

Claims (1)

[Claims] (1) Forming a glaze layer on a substrate, forming individual electrodes and a common electrode on this glaze layer, and forming a reinforcing pattern extending in a direction perpendicular to the printing direction in an overlapping manner on this common electrode, The tip portions of the individual electrodes and the tip portions of the common electrode are arranged so as to mesh with each other alternately, and a band-shaped heating resistor is formed thereon in parallel with the reinforcing pattern, and the individual electrodes, the common electrode, the reinforcing pattern and A thick film type thermal head comprising a heating resistor covered with a wear-resistant layer, characterized in that a part of the heating resistor in the width direction is arranged so as to overlap with the reinforcing pattern. type thermal head.