JPS63202467A - Linear thermal head - Google Patents

Abstract

PURPOSE:To improve printing speed through the increase of cooling efficiency by arranging resistors at alternately shifted positions. CONSTITUTION:Patterning is performed by arranging resistors at alternately deviated positions, and then a common electrode 1 and discrete electrodes 3 are patterned on each resistor 2. When the resistors 2 generate heat, at least adjoining resistors on both sides of the resistors 2 are cool. Therefore, the cooling efficiency of the heat generating element is improved, and subsequently printing speed increased.

Description

Detailed Description of the Invention -r Industrial Application Field The present invention relates to a printing section with good thermal efficiency in a thermal printing device, particularly a linear thermal head.

[Summary of the invention]

This invention provides a thermal printing device in which resistors are alternately arranged at different positions in order to improve the printing speed.
This provides a linear thermal head with improved cooling efficiency.

[Conventional technology]

In the printing part of thermal printing methods such as facsimile machines, so-called linear thermal heads, in which heating elements are arranged in a line perpendicular to the feed direction, have already been commercialized and put into practical use.

The printing speed of a thermal printing device using a linear thermal head (hereinafter referred to as head) is determined by the temperature characteristics of the head. To improve printing speed, it is necessary to shorten the pulse time of the iXt flow pulses supplied to the resistor of the head and increase the number of pulses supplied per unit time.Currently, the pulse time is increasing The limit is several m5ec in rad, and with this pulse time, it takes about 5 seconds to print on A4 paper in the vertical direction.
Requires ec.

Currently, as a high-speed head, it is necessary to further shorten this time, and a head with good thermal efficiency that can shorten the pulse time is required.

[Problem that the invention seeks to solve]

The main reason why the pulse time cannot be shortened is that as the pulse time becomes shorter, in order to obtain the desired print density, it is necessary to increase the pulse voltage to keep the energy constant, and as the voltage increases, the heat generation temperature also increases. This is because the temperature cannot drop completely before the pulse is generated. Therefore, in order to shorten the pulse time, it is necessary to create a head that rises in temperature quickly, has less heat loss, and is easier to cool down.

[Means for solving problems]

In order to improve the printing speed, the present invention arranges the resistors in alternating positions as shown in FIG. 1 as a means to make it easier to cool down. Since no heat is generated, the cooling efficiency of the heating element is improved.

[Effect]

As described above, if the resistors are arranged alternately at different positions, at least the sides on both sides of the resistor do not generate heat, so
Compared to conventional heads that are arranged in a straight line, the ambient temperature is lower than that of resistors that generate heat on both sides, increasing cooling efficiency. Therefore, the pulse time can be shortened and the printing speed can be improved.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
The figure shows a planar pattern of a linear thermal head manufactured according to the present invention. The structure is similar to the cross-sectional structure, and the head is constructed by firing a brace on a ceramic substrate, patterning a resistor and an electrode, and further protecting it with an anti-oxidation layer and a wear-resistant layer. Here, resistor 2. The patterning of the individual electrodes of the common electrode 111 is different from the conventional method, and as shown in FIG. 1, the resistors are alternately shifted and patterned, and the individual electrodes of the common electrode 1 are patterned on each resistor.

It can be manufactured using steps similar to conventional methods.

As for the printing characteristics of such a head and a conventional linear thermal head, FIG. 2 shows the results of measuring the surface temperature of the head under continuous pulse application.

As can be seen from the figure, when the pulse load conditions were kept constant, the temperature rise was found to be suppressed by about 15% compared to the conventional head.

〔Effect of the invention〕

As mentioned above, by using a head in which the resistors are alternately arranged at different positions, compared to the conventional head,
This is an invention with high industrial value and excellent printing performance, with an increase in temperature of about 15% and printing speed of about 10%.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a planar pattern of a linear thermal head as a specific embodiment of the present invention, and FIG. 2 is a diagram showing continuous pulse test results of the head of the present invention and a conventional head. 1...Common electrode 2...Resistor 3...Individual electrodes and above Applicant: Seiko Electronics Co., Ltd. 7-Malhead's flat surface pattern Figure 1 Figure 1 Rapid buffing process T figure 2

Claims (1)

[Claims] In a linear thermal head in which resistors are arranged perpendicular to the printing direction of the thermal head of a recording device that performs printing by generating electricity and generating heat, the resistors are arranged with their positions alternately shifted in the printing direction, and the common electrode is simply connected. A linear thermal head characterized by having one or more linear thermal heads and improving printing speed.