JPS6042067A - Heat sensitive recording head - Google Patents

Abstract

PURPOSE:To reduce troublesome paper jamming by forming a surface swell due to the foaming in the thick film interface at the end of a cover applied to protect a drive control element to be a guide for prevention of jamming. CONSTITUTION:A drive control element 8 and a protective cover 9 for cover and protect it are provided on both sides of a heat generating resistor layer 5 through a wire 7 and creates bubbles 10 on the interface between a conductor layer 4 and a glass layer 6 at the end of the second glass layer 6 to generate an extrusion 11. The presence of the extrusion 11 reduces the step with the protective cover 9 thereby controlling paper jamming significantly during the driving with a decrease in the clearance.

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a heat-sensitive recording head used in heat-sensitive recording devices such as printers and facsimiles, and uses a thickness conversion method for 11-#. It relates to a thermal recording head.

[Prior art] In a thermal recording head that performs recording by selectively heating several heating resistors according to image information, a current is supplied to each heating resistor based on an image signal.
- drive leads are provided in one-to-one correspondence. For this reason, when high-quality recording with high recording density is required, the distance between the drive leads becomes narrow, resulting in inconveniences such as poor connection with the drive circuit.

Therefore, a thermal recording head as shown in Figure @1 has been devised. The thermal recording head in this building is called an alternating-lead type thermal recording head, and one is placed on the substrate 1 perpendicular to the sub-traverse direction of the thermal recording head (the feeding direction P of thermal recording paper, etc.). A heating resistor 1 is provided with a plurality of electrodes a1, bl, a2, b2, a3, b8,
...aB bn (n is even) is arranged to form heat generating parts 7, h9...hI+ that are adjacent to each other, and selectively applied to the electrodes 1, bl, a2... Powered to '1
- By doing so, a desired heat generating part of the heat generating parts 4, +12, . It has lead leads L, . becomes very easy. In addition, these leads extend to both sides of the driver IC.
Oh,, 11 drive circuit consisting of I゛diode 1
Blue 11j, which requires element groups 4 on both sides, but allows the lead spacing to be twice the recording density.
It has certain symptoms.

However, in this case, the drive control element part of both [111] must be covered with a protective cover 5 (or a cap) to protect it.
- There were five problems in which the paper feed, that is, the running of the recording paper, was not successful due to gaps or differences in level.

To solve this problem, 1ffl was added to the gap between the edges.
Is the surface slippery if you apply oil or cover it with a protective cover? ) It was necessary to make it into a large and thin sheet-like material.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and eliminates the drawbacks of the thermal recording head as described above, and provides a guide for preventing paper jams in the normal thick film process for forming the thermal recording head. The purpose is to form.

[Structure of the invention]

In the thermal recording head of the present invention, a surface ridge is formed at the end of the cover that is attached to protect the drive control element section due to foaming at the interface of the thick film layer, and this is used as a guide for preventing paper jams. - This paper is intended to be fed smoothly using a filter.

〔Example〕

Hereinafter, a thermal recording head according to an embodiment of the present invention will be explained with reference to the drawings.

As shown in FIG. 2 as a top view and as shown in FIG. The first glass layer 3 formed thereon, the electrode a1 formed thereon, and the leads 11 alternately drawn out from the electrodes in opposite directions. A second conductor layer 4 comprising a heat generating resistor layer 5 formed on the mold bar, and a second glass layer 6 formed to protect leads etc. Furthermore, the heating resistor layer 5
A drive control element 8 connected to the first conductor layer 2 via a wire 7 and a protective cover 9 for covering and protecting the drive control element 8 are disposed on both sides of the drive control element 8.

At the end of the second glass layer 6, bubbles 1o exist at the interface between the second conductor layer 4 and the second glass layer 6, and the surface of the second glass HA 6 forms a raised portion. It consists of 11. The protective cover 9 also includes the heating resistor layer 5.
In contrast, it is tightly compressed to the outside of the raised part.

Next, a method for manufacturing this thermal recording head will be explained.

A first conductor layer 2 is formed on an alumina substrate 1 by screen printing and firing.

Next, screen printing was performed using a glass paste commonly referred to as C8L460B as an ink, and the first glass layer 3 having a thickness of 15 μIn was formed by firing at 930° C.

Furthermore, using a gold conductor paste known as Masosei Yamanaka's xu; as an ink, screen printing was performed, and the paste was fired at 930°C.
Conductor layer 4/Y: Formed.

Thereafter, the heat generating resistor layer 5 is formed by using the resistor paste as ink, screen printing and baking.

Then, printing was performed using a glass paste called DuPont 315032 as an ink, a stainless steel 400 mesh, and a 25 μnl screen of emulsion, and then baked at 930° C. to form a 1@2 glass layer 6 with a film thickness of 12 μm. -ru.

By the way, since the second glass layer 6 is rich in thixotropy, when the second glass layer 6 is formed directly on the substrate, the cross-sectional shape of the end part is as shown in Fig. The width l of the sublayer 9 is 250 μm, and the film thickness is 17~
It is about 18 μm. At this time, the bubbles are formed at a portion where the thickness of the second glass layer 6 exceeds 15 μm, that is, at an end portion of approximately 20 μm.
0 μm and the first glass layer (gSG 46
08 glass paste), second conductor layer (Yamanaka Massey J
jQ114G gold conductor paste) and the second glass layer (Dupont 5032 glass paste). This is the end of the glass layer and the part where the lead (which is the second conductor layer) is present.

The drive control element 8 is adhered onto the thick film circuit board thus formed, and is electrically connected to the leads by being connected to the first and second conductor layers by wire bonding.

Finally, on the outside of the raised portion 11, the 1
A protective cover 9 that covers the drive control element 8 as shown in FIG.
layer.

According to this thermal recording head, due to the presence of the raised portion 11, not only the level difference with the reef cover 9 is small, but also the gap is reduced, so that it is possible to significantly suppress filter paper jams during driving.

Note that in this example, there is no raised portion in the portion (for example, A) where no leads are present, and the raised portion is discontinuous, leaving a slight gap. Furthermore, in order to smoothly feed the paper, it is also effective to form the lead in 2) vl. That is, on the second glass layer, the third conductive layer forms leads in the upper layer between the leads in the lower layer, and these leads are formed in the same way as the first glass layer. A continuous raised portion may be formed by coating 1' with a third glass layer made of paulownia.

In addition, the laminated structure of the M film for generating air bubbles is not limited to the combinations of the embodiments.

[Effect of the Invention J According to the present invention, a raised part for preventing paper jams can be provided in the normal thick film process, so the manufacturing cost does not increase (Jtl: thermal recording head with fewer clogging defects). It becomes ii' iiJ ability to provide.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a normal alternating lead type thermal recording head.
Fig. 2 ($6, top view of a thermal recording head according to the present invention), Fig. 3 is a sectional view taken along the line A-Δ in Fig. 2, and Fig. 4 shows the second glass layer 11. It is a diagram showing the cross-sectional shape of a printed edge when formed on a board. l... Alumina substrate, 2... I-th conductor layer, 3...
- First glass layer, 4... Second conductor layer, 5... Heat generating resistor layer, 6... Second glass jA, 7... Wire, 8... Drive control element, 9...Protective cover, lO
...Bubble, 11...Protuberance. Figure 1 Figure 2 Figure 1 Figure 3 0 3

Claims (1)

[Claims] At the same time as installing the control unit of FiJ3 on the board, this A!
J8 dynamic control A thermal recording head comprising a protective cover for dynamic control, characterized in that a surface protrusion is provided adjacent to an end of the protective cover by foaming the thick film layer interface. thermal recording head,