JPS63132066A - Thermal head - Google Patents

Abstract

PURPOSE:To suppress the variation in recording density due to a recording pattern even when one-dot recording and solid recording are present in a mixed state, by separating the interval between dots constituting a block by two dots or more. CONSTITUTION:All of the strobe signals STB1-STBm of a strobe signal 9 are set to logic '0' and image data D11-D1n, D21-D2n,..., Dm1-Dmn are set. Next, when the strobe signal STB1 is set to logic '1C', the recording of the image data D11-D1n corresponding to a block 11 can be performed. Therefore, when the strobe signals STB2-STBm are successively set to logic '1', the recording of one line can be performed. When recording is performed using this thermal head, since heat generating resistors R11-Rmn constituting blocks 11-1m are separated by m-dots, even when solid recording is performed, said recording becomes the same state as one-dot recording and the effect of recording density due to a recording pattern is eliminated and recording quality is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a thermal head used in a thermal recording device.

[Conventional technology]

FIG. 2 is a structural diagram showing a conventional thermal head disclosed in, for example, Japanese Utility Model Application No. 60-162046. In the figure, 1 indicates a heating resistor forming a dot, and R1
1~R1nt R21~R2n, -1. −.

The heating resistors 1 indicated by Rm to Rmn constitute blocks 11, 12+, . . . , 1m, respectively. 2 indicates a common electrode, and each common electrode 2□, 22. ...consists of 2m.

3 is an individual electrode, 4 is a diode, 5 is a common electrode 2□, 2
□, .
□, . . . 1 The heating resistor constituting the rrU is selected.

Next, the operation will be explained.

one of the common electrodes 2 by a common electrode switch 5;
For example, by selecting common electrode 2, block 1
, and record the block 1 by turning on and off the individual electrode switches 6, to 6m according to the image data signal corresponding to the block 1□, thereby causing the selected heating resistor 1 to generate heat. I can do it.

Therefore, one line can be recorded by performing the same operation for the other blocks 1□ to 1m.

[Problem that the invention seeks to solve]

Since the conventional thermal head is configured as described above, the blocks 1 recorded at the same time and the heating resistors 1 of ~1 m are adjacent to each other, so there is a difference in the amount of heat generated depending on the content of the image data signal, that is, the recording pattern. The influence of this will be noticeable on the records. For example, 1 dot recording and each block 1
□In the case of solid recording that records all dots of ~1m,
In the case of solid recording, the temperature of the heating resistor 1 becomes higher due to the influence of the heat generated by the adjacent heating resistor 1.

Therefore, if one dot recording is performed under solid recording conditions, the density is sufficient, but on the other hand, when solid recording is performed under one dot recording conditions, bleeding occurs and the recording quality deteriorates.

In addition, when one-dot recording and solid recording are mixed, if a circuit is provided to refer to the heat generated by the adjacent heating resistor 1 to keep the recording density constant, recording control becomes difficult and the thermal head becomes expensive. There was a problem.

This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a thermal head that can suppress fluctuations in recording density due to recording patterns even when single-dot recording and solid recording are mixed. With the goal.

[Means for solving problems]

In the thermal head according to the present invention, the dots constituting blocks that are simultaneously recorded are separated by two or more dots.

[Effect]

In the thermal head of this invention, even if solid recording is performed in blocks, each dot is separated by two or more dots.
Solid recording is possible in the state of one-dot recording.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the same parts as in the wJz diagram are given the same reference numerals, and blocks 10, 1□, ..., 1m (not shown) are R1□, R2□, ...Rrnl, R1, respectively.
21R221'...Rm 2,..., R, R,..."
It is composed of a heating resistor 1 exhibiting IHz n in 'mn.

T is a transistor for operating the heating resistor 1, 8
AND circuit for driving Fi transistor 1, 9 is strobe signal 5TB1.5TB2゜..., STBm
shows a strobe signal consisting of blocks 10, 1□,
..., t or 1m is selected. 10 is image data D-D, Dll 1fi
21 to D..., indicates an image data signal n I consisting of Dml to Dmn, logic 11f1 when black and logic 1 when white
() Takes the value of l.

Next, the operation will be explained.

First, all strobe signals 5TB1 of strobe signal 9
Set STBm to logic “01” and input image data DIl~
D1n, D2□~D2n,...+ Drn 1~Dm
Set n.

Next, if the strobe signal 5TB1 is set to logic 111,
Image data DIl-D corresponding to block 1 can be recorded. Therefore, by sequentially setting the n strobe signals 5TB2 to STBm to logic @I'', recording of one line can be performed.

When recording is performed using the thermal head of the present invention in this way, the heating resistors 1 constituting the blocks 11□ to 1□□ are separated by n dots, so even when performing solid recording, it is possible to perform one-dot recording. Under the same conditions, the influence of the recording pattern on the recording density is eliminated and the recording quality is improved.

Furthermore, since there is no need to provide a circuit that refers to the heat generated by the adjacent heat generating resistor 1, the thermal head, and thus the printer, can be constructed at low cost.

In the above embodiment, the spacing between the heating resistors 1 constituting the blocks 11 to 1mk has been described as n dots, but the same effect can be achieved as long as the spacing between the heating resistors 1 is at least 2 dots or more.

Although only the relationship between the strobe signal 9 and image data note 10 is shown, a latch circuit that holds image data, a shift register circuit that inputs image data serially and outputs it in parallel, an AND circuit 8, and a transistor A drive IC in which 7 and 7 are integrated into one chip also produces the same effect as the above embodiment.

〔Effect of the invention〕

As described above, according to the present invention, since the dots constituting the block are configured to be separated by two or more dots, even in the case of solid recording, it is possible to record in the state of one dot recording.
The recording density becomes constant and the recording quality improves.

Further, since there is no need to provide a circuit for referring to the thermal state of adjacent dots, there is an effect that the printer can be constructed at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a thermal head according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional thermal head. 1 is a heating resistor, 1, ~1m is a block, 2 is a common electrode, 3 is an individual electrode, 7 is a transistor, 8 is an AND circuit,
9 indicates a strobe signal, and 10 indicates an image data signal. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. r゛7nzomata procedural amendment (voluntary)

Claims (1)

[Claims] A thermal head that divides all dots into a plurality of blocks and performs recording by sequentially switching between the plurality of blocks, characterized in that each of the dots constituting the block is allocated at intervals of two dots or more. .