JPS61146567A - Thermal head - Google Patents

Abstract

PURPOSE:To suppress the occurrence of dispersion of resistance as well as obtain the correlations of resistance values by forming a heating resistor element and a monitor resistor into the same shape. CONSTITUTION:Many terminals 1a-1z are arranged on a wafer 5 and a heating resistor element 4 is set. The heating resistor element for one dot corresponds with one between the terminals 1a and 1b. The same resistors as the heating resistors between the terminals 1a-1z are set on the same row from theterminal 2a to the terminal 2g, and between the terminals 2a and 2g is made up of heating resistors for plural dots. The terminals 2a and 3g forming the monitor resistor and the terminals 1a-1z forming heating resistor elements are arranged on the same row by the same shape of heating resistor element 4. Since the monitor resistor has the same structure as the heating resistors for plural dots, Each dispersion of the resistance values of dots is equalized and resistors having sufficient correlations with the heating element can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitor resistance for a thermal head used in thermosensitive recording.

[Conventional technology]

FIG. 8 is a sectional view showing a conventional monitor resistor disclosed in, for example, Japanese Unexamined Patent Publication No. 58-1118876. The thermal head (6) shown in Fig. 8 (4) has a plurality of heat generating resistors (sl 1) arranged in a vertical line, and a monitor resistor (9) having the same structure as the heat generating element (8) below. ).In addition, in the thermal head (7) shown in Figure 3 (4D), a similar heat generating resistor element (8) is provided on the side of the plurality of heat generating resistive elements (8) arranged in a vertical line. A configuration is adopted in which one monitor resistor (9) having a structure is provided.

Next, the operation will be explained. 2. Description of the Related Art Thermal heads have been widely used as recording means in facsimile machines and the like. This thermal head is a print head in which a plurality of heat-generating resistive elements are arranged in a vertical line, and each heat-generating resistive element is energized in response to a print control signal, thereby printing in dot format on recording paper.

Many thermal heads have large variations in the heating resistance element, so it is necessary to readjust the applied power properly according to the resistance value of the thermal head. Compare this resistance value with the standard resistance value, By changing the energization time to the heat generating resistor according to the difference, it is possible to apply power appropriately.

Also, the monitor resistor has a structure in which a resistance element is independently attached to an 7-lexiple wiring board (iFPc) other than on the thermal head board.

[Problem that the invention seeks to solve]

Conventional monitor resistance existed as an independent pattern from the heating resistor element, so there was no correlation with the resistance value of the heating element due to the dimensional accuracy and printing accuracy of the screen.On the other hand, it is possible to monitor one dot of the heating resistor element. When used as a resistor, the resistance variation was too large to be used. This invention was made to solve the above problems. The purpose is to obtain sufficient correlation.

[Means for solving problems]

The monitor resistor of the thermal head according to the present invention is formed simultaneously with the heating resistor element in the same row as the heating resistor element, and its length is determined by using a plurality of dots of the heating resistor element for recording, or by increasing the dot length of one dot. It is something.

[Effect]

Since the heating resistor element and the monitor resistor have the same shape, there is a good correlation between the resistance values and resistance variations can be suppressed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a large number of terminals (1a) to (12) are arranged on a substrate (61), and a heating resistor element (4) is arranged.1
The heating resistance of the dot is between (la) and (+1). Terminals (8a) and (82) forming the monitor resistance
). Terminals (la) to (lz) Resistors similar to the heat generating resistors in the background are arranged in the same row from terminals (ga) to (22). The space between the terminal (2a) and (revised) is formed by a plurality of dots of heating resistor.

In FIG. 8, the heating element resistors 14] shown in FIG. 1 are arranged in the same way from the terminals (la) to (1g) 1.

Terminals (2a) and (22) form a monitor resistor.

In this case, the distance between the terminals (8a) and (3b) is much longer than that of one (one dot) terminal of the heating resistor element.

Resistors that are the same as the heating resistors are arranged in the same row from (8a) to (8b).

In FIG. 1, the terminal (!Ia) forming the monitor resistor.

(!p) and terminals (la) to (1
z) are heat generating resistive elements (4) of the same shape and arranged in the same row. For this reason, since the monitor resistor has the same structure as the heating element and has a plurality of dots, individual variations in the resistance value of each dot are averaged out, and a resistor having a sufficient correlation with the heating element can be obtained.

Terminals (8a) (8b) forming the monitor resistance in Figure 2
) and (la) to (1m) forming heating resistive elements are arranged in the same row as heating resistive elements 41 having the same shape. The monitor resistance is determined by the dot length (la) of the heating resistor element and (1k
) Since the length is sufficiently long, the resistance value is stabilized, and it is possible to create a device that has a sufficient correlation with the heating resistance.

In FIGS. 1 and 8, the monitor resistor is drawn out from one side of the heating resistor element and wired, but the monitor resistor may be provided on both the left and right sides.

〔Effect of the invention〕

As described above, according to the present invention, since the heat generating resistor element and the monitor resistor are located on the same line, the accuracy of screen plate making is simple because the heat generating element and the monitor resistor have the same shape.

Since the monitor resistor has the same shape, the variation of one dot in the heating resistor element is averaged out, so the accuracy is high and the correlation is high.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the thermal head of the present invention, FIG. 3 is a block diagram of another embodiment of the thermal head according to the present invention, and FIG. 3 is a block diagram of a conventional thermal head. . In the figure, (la) to (1g) Id recording terminal,
(la) ~ (s P ) Fi monitor terminal, (41 is a heating resistor. The same reference numerals in each figure indicate the same or corresponding parts. Figure 3 Procedural amendment (voluntary) 1. Indication of the incident Patent Application No. 69-270108 2,
Name of the invention Thermal head 3. Person making the amendment (Corrects Figures 1 and 2 of 21 drawings as shown in the attached sheet. 7. List of attached documents (1) Drawings 1 or more copies

Claims (1)

[Claims] A heating resistor formed in a row on a substrate, a plurality of recording terminals connected to a part of the heating resistor to supply a recording current, and a plurality of recording terminals connected to the remaining part of the heating resistor. A thermal head is provided with a monitor terminal, and the interval between the monitor terminals is equal to a plurality of dots of a recording heating resistor.