JPS6299162A - Recording head - Google Patents

Abstract

PURPOSE:To provide a recording head easily and with high precision, by constituting a recording head of a common electrode, a spacer, a recording electrode and an electrode substrate in a four-layer construction. CONSTITUTION:To produce a recording head 1, recording electrodes 4 are provided by a thick-film printing technique on an electrode substrate 3 consisting of an unfired ceramic or the like which is called green sheet, and a substrate 2 formed by firing and a common electrode 6 consisting of a conductive material such as a metal are fixed respectively to both sides of a spacer 5 by an adhesive or are fixed by a head jig 11. Since the recording electrodes 4 can be provided with an accuracy equivalent to the mask accuracy in the thick-film printing, mass-production with high accuracy can be achieved. The spacer is preferably formed from a heat-resistance resin such as a polyimide having excellent heat resistance and dimensional accuracy. The recording head may suffer mechanical abrasion due to contact with an ink film during printing. Therefore, in order to enhance durability and the property for electrical contact with a resistor layer, the recording electrodes are preferably formed from a high melting point metal having excellent abrasion resistance, such as tungsten and molybdenum, and the electrode substrate 3 is preferably formed from a cuttable ceramic comprising mica as a main constituent.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording head, and more specifically to a recording head of an electrically conductive thermal transfer type printing device that uses an electrically heated thermal transfer film and is capable of limiting the gradation range. Regarding.

[Conventional technology]

The recording head of the conventional electrical thermal transfer type printing device was developed in a patent application filed in
9-31022, recording electrodes are formed on an electrode substrate made of ceramics or the like before sintering using thick film printing technology, and the sintered substrate is bonded to 21i# conductive material. was there.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, in order to suppress crosstalk between the recording electrodes and eliminate variations in the size of printed dots due to the recording electrodes, the thickness of the electrode substrate must be set to a value close to that of the recording electrodes, and the thickness must be uniform. It needed to be thick. For this purpose, it was necessary to pay attention to various conditions such as the method of forming the electrode substrate before sintering, the composition of the binder for sintering, the sintering temperature, and the sintering time. Further, when the substrate is formed by performing post-baking machining, the number of manufacturing steps increases, and no matter which method is used, forming the substrate is a difficult process.

[Failure to solve the problem]

The recording head of the present invention is capable of performing a plurality of recordings [a recording head having a pole and a common electrode is pressed against a resistive layer of a sheet having a resistive layer and a heat-melting ink layer, and a current is applied to dissolve the heat-melting ink at 1 AI. In a printing device that transfers images onto recording paper, the recording head has a four-layer structure consisting of a common electrode, a spacer, a recording electrode, and an electrode substrate, and the material of the spacer is a high-density material such as polyimide whose thickness is close to the pitch of the recording electrodes. It is characterized by being a heat-resistant resin.

[Effect]

According to the configuration of the present invention, the distance between the recording electrode and the common electrode with respect to crosstalk and dot variation is determined by the thickness of the spacer and its accuracy. Therefore, the thickness of the electrode substrate and its accuracy are not a problem, so the electrode substrate can be easily formed. Then, a recording head can be formed by fixing the recording electrode and common electrode of the resulting sintered substrate to both sides of the spacer using adhesive or a head jig.
In addition, the heat-resistant resin such as polyimide used for the spacer material has high dimensional accuracy, and by making the spacer thickness close to the pitch of the recording electrodes, it is possible to create a highly robust recording head that suppresses crosstalk. It's easy to make.

〔Example〕

Embodiments of the recording head of the present invention will be described below with reference to the drawings.

(Example 1) Fig. 1 shows a recording head of the present invention.The recording head 1 prints a pole 4 on an electrode substrate called a green sheet, which is made of ceramics or the like before firing, using thick film printing technology. The substrate 2 formed and fired and the common IT pole 6 made of a conductive material such as metal are fixed to both sides of the spacer 5 with an adhesive, or with a head jig 11 as shown in FIG. Make it fixed. Since the recording type tj4 can be produced with the mask precision of 4-way printing, it is possible to mass-produce with high precision and provide an inexpensive recording head.

The suitable material for the spacer is a heat-resistant resin such as polyimide, which has excellent heat resistance and dimensional accuracy.0The recording head is subject to mechanical wear due to contact with the ink film during printing, so durability and electrical In order to improve the contact properties, the material of the recording electrode 4 is preferably a high melting point metal with excellent wear resistance such as tungsten or molybdenum, and the material of the electrode substrate 6 is a machinable ceramic mainly composed of mica. In this investigation, we used tungsten as the recording electrode material, mica ceramics as the 'FjL electrode substrate material, polyimide resin with a thickness of 150 μm as the spacer material, the recording degree was 4 dot/mu, and the number of recording electrodes was 80
When we prototyped a book recording head and conducted a printing test using 8-division motion, we found that 16-gradation expression was affected by crosstalk,
A high quality print with no dot variations was obtained by recording 'Iml'4. Furthermore, the spacer was subjected to thermal abrasion during printing, and as a result, the recording electrode was made to protrude, thereby improving electrical contact with the film.

(Example 2) Figure 3 shows an example of a recording head using a manufacturing method different from the above example. Substrates 2 and 4 are formed by arranging high melting point metal wires at regular intervals and fixing them to the electrode substrate 3 using an inorganic adhesive containing 5102 as a main component.
A common electrode 6 made of a cage-like material is fixed to both sides of the spacer using an adhesive or the head assembly shown in FIG. 2. The accuracy and height of the diameter of the tungsten wire used as the recording electrode material are high, and if they are arranged on the electrode substrate 3 with high precision and the thickness of the spacer 5 is chosen to be close to the pitch of the recording electrodes 4, high accuracy and high accuracy can be obtained. You can make detailed heads.

In the present invention, a tungsten wire is used as the recording electrode material, a 100 μm thick polyimide film is used as the spacer material, and mica ceramics is used as the electrode substrate material, and the recording density is 8 do.
t/Tomo, we prototyped a recording head with 160 recording electrodes.

〔Effect of the invention〕

As described above, according to the present invention, record! By making a recording head by fixing a fired electrofused substrate having poles and a common Ti to both sides of a spacer made of a heat-resistant resin such as polyimide, it is possible to easily provide a high-definition recording head. has. By using mica ceramics as the vL electrode substrate material and polyimide film as the spacer material, the recording electrode can be protruded through mechanical and thermal abrasion with the ink film, improving electrical contact and producing high-quality prints. It also has the effect that it can be obtained.

[Brief explanation of drawings]

FIGS. 1 and 3 are diagrams showing embodiments of the present invention. FIG. 2 is a diagram showing a head jig for fixing the recording head of the present invention. 1... Recording head 2... Substrate 5...'! ff, pole board 4...Record 1JL pole 5...Spacer 6...Both m electrode 7...Adhesive 8...Head holder Plate 9...Head jig extra wide 10...Head U running screw 11...Head jig or higher

Claims (4)

[Claims] (1) A recording head having a plurality of recording electrodes and a common electrode is pressed against the resistive layer of a sheet having a resistive layer and a heat-melting ink layer, and a current is applied to melt the heat-melting ink and transfer it to recording paper. 1. A printing apparatus, wherein the recording head has a four-layer structure including the common electrode, a spacer, the recording electrode, and an electrode substrate. (2) The recording head according to claim 1, wherein the material of the spacer is a highly heat-resistant resin such as polyimide, and the material of the electrode substrate is a machinable ceramic mainly composed of mica. . (3) The recording head according to claim 1, wherein the thickness of the spacer is close to the pitch of the recording electrodes. (4) Either the recording head is fixed by adhering the substrate on which the recording electrodes are formed on the electrode substrate and the common electrode to both sides of the spacer, or the recording head is used to attach the recording head to the printing device. 2. The recording head according to claim 1, wherein the recording head is manufactured by fixing the recording head using a head jig.