JPS6347158A - Thermal head - Google Patents

Abstract

PURPOSE:To enable the simple adjustment of the surface condition of a heating resistor portion after the assembly of a thermal head to omit a manufacturing control and enhance a printing quality, by a method wherein the height of a heat sink can be finely adjusted by an adjusting screw. CONSTITUTION:A slit 3a is formed laterally from the end face of a heat sink 3 near the portion of a heating resistor 2. To finely change the slit 3a in shape, an adjusting screw 4 is installed to the heat sink 3 from the rear surface thereof. In this construction, the adjusting screw 4 is operated from the reverse of the heat sink 3 after the assembly of a thermal head, whereby the irregular form of the surface of the heating resistor 2 is always corrected arbitrarily to be a flat form, a projected form, etc. in a simple manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a thermal head that forms the main part of a thermal printer that is a heat-sensitive or thermal transfer printing device.

[Conventional technology]

Figure 1 shows a conventional thermal head, in which a heating resistor and a protective film layer (2) are formed on an alumina substrate and a glass layer (1), and these substrates are connected to a heat sink (3). ) is fixed.

With the above configuration, electrically controlled heating resistor (2)
When energized, the heating resistor (, 2) generates heat, and the heat acts on a printing medium such as thermal paper or thermal transfer ink that is in close contact with the surface of the heating resistor protective film layer to print.

[Problem that the invention seeks to solve]

The conventional thermal head as described above consists of an alumina substrate, a glass layer (1), a heating resistor, and a protective film layer (2).
) is flat, the heating resistor protective film layer (2) and the printing medium will be in uniform contact with the printing medium, and good printing quality will be obtained. However, in reality, the alumina substrate, glass layer (1), heating resistor However, the protective film layer (2) is not flat, resulting in mild unevenness on the surface, which causes problems in terms of print quality, such as density unevenness and scum V phenomenon.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a thermal head that can achieve high-quality printing without causing density unevenness or the scum V phenomenon.

[Means for solving problems]

In the thermal head according to the present invention, a slit is made from the end surface near the heat generating resistor portion of a heat sink to which an alumina substrate or the like is fixed, and an adjustment screw is attached from the back surface of the heat sink.

[Effect]

In this invention, the slit of the heat sink is slightly deformed by tightening the adjustment screw attached to the heat sink, thereby changing the height position of the heat sink.

As a result, the uneven shape on the surface of the heating resistor layer is modified, or the heat generating resistor layer is deformed into an arbitrary shape such as a convex shape.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and in the figure, a sulin (3a) is formed in the lateral direction from the end face of the heat sink (3) near the heating resistor (2).

In order to finely deform the heat sink (3a), an adjustment screw is attached from the back side of the heat sink (3).

In addition, the same reference numerals as in FIG. 2 indicate the same parts.

After assembling the thermal head with the above configuration,
By operating the adjustment screw (<=) from the back side of the heat sink (3), the uneven shape of the surface of the heating resistor (2) can be easily modified to any shape such as flat or convex.

In addition, in the above example, the adjustment screw (ri) is
, ya) shows a method in which the heat sink is lifted upward by hitting the upper wall surface and tightening the screw, but the adjustment screw is passed through the heat sink, and by tightening the screw, it is possible to directly touch the substrate (1) such as ceramic. It may also be of a type that lifts upward.

〔Effect of the invention〕

As described above, according to the present invention, since the height of the heat sink can be finely adjusted using the adjustment screw, the surface condition of the heating resistor section can be easily adjusted after the thermal head is assembled, and manufacturing management By omitting this, the print quality can be better controlled.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 1 is a side view of a conventional thermal head. (1)...Alumina substrate and glass layer, (C)...Heating resistor and protective film layer, (3)...Heat sink, (
3a)...Slit, (II)...Adjustment screw. In each figure, the same reference numerals indicate the same or corresponding parts. 1. Board 2゛ Departure and resistance 3 ・Heat! +-ri 3o Su I Hashito 4, Nabe Bogashi Proceedings Amendment (1 Puke May 13, 1986)

Claims (1)

[Claims] fixing a heating resistor formed on a substrate and the substrate;
The thermal head also includes a heat sink for storing and transmitting heat, a slit formed in the heat sink, and an adjustment screw for adjusting the width of the slit.