JPH0657456B2 - Thermal recording head - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal recording head, and more particularly to a thermal recording head suitable for saving power by dividing printing in a printing apparatus having a continuous paper feeding mechanism.

[Conventional technology]

When the conventional thermal recording device uses an in-line thermal recording head in which the resistor is formed linearly to save power,
Although the thermal recording head is driven separately, although attention has been paid to color unevenness due to a decrease in the temperature of the divisions, no particular attention has been paid to misalignment. In Japanese Patent Application No. 57-166155 as well, similarly, attention is paid to color unevenness and the voltage value is simply determined into blocks.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, the density is mentioned because the printing is mainly considered, but no consideration is given to the positional deviation when the divided printing is performed. When printing is performed, this positional deviation appears as a discontinuous line in the printing, and there is a problem that the printing start line on the screen appears to be shifted for each divided block, and this is also true for the end line.

An object of the present invention is to solve such a problem.

[Means for solving problems]

The above object is achieved by shifting the position of the resistor of the thermal recording head in the paper feeding direction (hereinafter referred to as the sub-scanning direction) for each divided block of the image and changing the position of the resistor heating portion.

In other words, the electrodes disposed at both ends of the resistor material and the counter electrode are displaced in the sub-scanning direction by the sub-scanning distance divided by the number of divided blocks to form the resistors, thereby eliminating the positional deviation during printing. be able to.

At this time, the contact surface between the resistor and the printing paper increases in the sub-scanning direction. Therefore, the protrusions are integrated, including the resistors that are displaced in the sub-scanning direction, that is, the protrusions that are integrally formed with the resistor coating portions at substantially the same position so that there is no displacement in the sub-scanning direction. Improves formation and contact with photographic paper.

[Action]

When a thermal recording head is divided and printed in a printing apparatus having a continuous paper feeding mechanism, a printing signal is first applied to the thermal recording head resistor at the regular position to heat the resistive element and perform thermal recording. During this period, the printing paper is fed in the sub-scanning direction by a fraction of the number of divisions. Therefore, the resistor formed by shifting in the sub-scanning direction by a fraction of the division generates heat by the next printing signal, The heat is recorded. Printing is performed in the same manner thereafter, and after printing for the number of divisions, the printing returns to the normal position again. By repeating this, one screen is constructed, and the print position is not displaced.

At this time, it is necessary that the resistor at the regular position and the resistor formed by shifting the position keep the same contact state with the printing paper.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a plan view of a thermal recording head of the present invention and a cross-sectional view of its main part. Reference numeral 1 is an electrode, 3 is a counter electrode, and 2 is a resistance. The block A is a resistor at a regular position, and the block B is a resistor formed by shifting by one half of the sub-scanning distance.

Next, the method for forming the resistor of the present invention will be described in detail. First
In the figure, an electrode 1 and a counter electrode 3 at regular positions are provided in a block A on an insulating substrate, and a half of a sub-scanning distance is provided in a block B.
The electrodes 1 and the counter electrode 3 are displaced by screen printing by firing and etching, and then a wide resistor covering the electrodes of the block A and the electrodes of the block B is printed and fired to form the resistors. The groove is cut in the direction of the electrode 1 and the counter electrode 3 by the laser beam to make the resistance independent.

Next, the protective layer 5 is printed on the resistor and fired to obtain a heating resistor.

According to the present embodiment, the resistance heating portion is formed with a resistance displaced by ½ of the sub-scanning distance in the sub-scanning direction, and the resistor is an integral convex portion, so that the printing position shift occurs. It is possible to obtain a thermal recording head that does not require printing and has good printing quality.

Next, specific examples will be described.

Print gold paste on the entire surface of the glaze ceramic substrate,
The electrode 1 and the counter electrode 3 were formed by baking and etching. The electrode interval is 300 μm, and the sub-scanning distance is 2
Block B was formed by offsetting one-hundred μm. Next, a resistance paste of 550 μm was printed to cover the electrode intervals of blocks A and B. After drying and firing, the resistance of the resistor was divided by laser light to form a resistance of 6 dots / mm.
The protective glass was printed and baked to obtain a heating resistor.

When a drive circuit was formed on this heating resistor and two-division driving was performed, it was possible to print without causing a printing position shift.

〔The invention's effect〕

According to the present invention, as described above, in the printing apparatus having the continuous paper feeding mechanism, it is possible to prevent the occurrence of the positional deviation seen between the printing blocks during the division drive performed for the purpose of power saving, and to improve the printing quality. Can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of the thermal recording head, and FIG. 2 is a cross-sectional view of an essential part of FIG. 1 ... Electrode, 2 ... Resistor, 3 ... Counter electrode, 4 ... Cutting groove, 5 ... Protective layer.

Claims (1)

[Claims] 1. An in-line type thermal recording head having a film-like resistor provided between an electrode and a counter electrode on an insulating substrate, wherein the film-like resistor is divided into blocks in the scanning direction. In the thermal recording head, the position of the electrode gap formed between the electrode and the counter electrode is formed by shifting by a fixed dimension in a fixed direction orthogonal to the scanning direction for each divided block, The dimension of the film-shaped resistor in the direction orthogonal to the scanning direction of the resistor is longer than the product of the number of the divided blocks and the constant dimension, the formation position of the plurality of film-shaped resistors, A thermal recording head, which is substantially the same in the direction orthogonal to the scanning direction.