JPS60147359A - Thermal recording apparatus - Google Patents

Abstract

PURPOSE:To make it possible to obtain uniform recording density, by preheating a recording means on the basis of the output of a reversal means for the pattern reversal of previous line data. CONSTITUTION:The data of a previous line L1 is reversed and a recording head is preheated by the reversed data. A recording control part 4 for inputting line data 1 from the outside outputs the signal corresponding to data D to a driver 5 which, in turn, drives a recording head 7 according to the signal of the recording control part 4 through a reversal device 6. The recording head 7 is driven by the driver 5 to record the line data D on the recording paper 9 delivered from a roll 8. The reversal device 6 reverses the drive signal from the driver 5 on the basis of the control signal from the recording control part 4 to transmit the reversed signal to the recording head 7. Further, the rotary timing of a step motor 10 is also controlled by the recording control part 4. By this simple constitution, sufficient and uniform recording density can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a thermal recording device, and particularly to a thermal recording device having a preheat function.

[Prior art]

In a conventional thermal recording apparatus, once the previous row L1 is recorded on a recording paper, the recording head is not driven until data for the next row L2 is transferred. Therefore, when the data of the next row L2 is transferred and recorded on the recording paper by the recording head, there is a drawback that sufficient image quality cannot be obtained in terms of density.

In order to eliminate this defect hγ, a method has been proposed in which the recording head is preheated between the row and L2 lines.

FIG. 1 is an explanatory diagram showing a conventional preheating method.

In the figure, the recorded portion 2 in row Ll on the recording paper 1 also represents the heating partial sound of the recording head (not shown). When the recording of the row L□ is completed, the recording paper 1 is transferred in the direction of the arrow, but during this time the same data of the rows Ll and ji:I continue to be transferred to the stable recording head for preheating.

However, in this method, the lower f5B of recorded portion 2
(The shaded area 3 in the figure) is sensitive to heat, resulting in so-called "fogging" and the image quality will not be improved.

In addition, when a part of the recording portion 2 of the next row L2 overlaps with the oblique edge portion 3 as shown in FIG. Since the amount of residual heat is small, the start of heating is delayed, resulting in uneven recording density and no improvement in image quality.

C. OBJECTS OF THE INVENTION The present invention is intended to eliminate the above-mentioned conventional drawbacks, and its object is to provide a heat-sensitive recording device that can obtain sufficient and uniform recording density through preheating.

[Summary of the invention]

In order to achieve the above object, the thermal recording apparatus according to the present invention is characterized in that the data of the previous row L1 is inverted, and the recording head is preheated by the inverted data.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic diagram showing the configuration of an embodiment of the thermal recording apparatus according to the present invention.

In the figure, external (for example, host computer, etc.)
The recording control section 4 which inputs the 2-in data D from the 2-in data D outputs a signal corresponding to the data D to the driver 5, and the driver 5 drives the door to record via the inverter 6 in accordance with the signal from the recording HjU control section 4. .

By driving the recording head 7 by the driver 5,
Line data D is recorded on the recording paper 9 that is fed out from the roll 8. Recording paper 9 is Ste.

Demo-JIO sends each line in the direction of the arrow. Note that the inverter 6 inverts the AIM motion signal from the driver 5 using the control signal from the recording control unit 4,
Record it and send it to the door. The recording control unit 4 also controls the rotation timing of the step motor 1o.

The operation of this embodiment having such a configuration will be explained with reference to FIGS. 3 and 4.

The recording control unit 4, which has input the line data D of a certain line L1, turns off the inverter 6 and turns off the driver 5. .

Ori□ya. □Uh, ytpr~8 pieces,'ru. Therefore, according to the signal input from the recording control section 4, the driver 5
The signal output from the recording head 70 directly generates heat without being reversed, and the signal is recorded on the recording paper 9. In this way, the recording paper 9 has the following information as shown in FIG.
94-lines are formed between the recorded portion 11 and the unrecorded portion. - When the recording of the next row is completed, the recording control unit 4 records the next row,
While waiting for line data D, a control signal is output to the step motor 10 to move the recording paper 9 by one line in the direction of the arrow. At this time, the recording control unit 4 turns on the inverter 6 at the ninth stage of preheating the door, and outputs the line data D of the line L1 just recorded to the driver 5.

The driver 5 outputs a signal to the recording door 7 in the same way as during recording, but since the inverter 6 is on, the signal is inverted and input to the recording and door. That is, as shown in FIG. 3, the signal output from the driver 5 is a signal corresponding to the pattern that heats the small recording portion 11, but after passing through the inverter 6, The pattern is reversed, and the heating element P is heated to record a portion other than the recording portion 11, and as the recording paper 9 moves, the hatched portion 12 becomes a heating area. Furthermore, in this embodiment, in order to avoid heat sensitivity, the driver 5 performs recording, and the thermal energy generated from the door is suppressed to half that of recording. As a way to reduce this heat energy by half, for example, by recording
Appropriate methods include shortening the pulse width of the voltage and bus pulse applied to the door.

In this way, as a preheat, by supplying a signal obtained by inverting the line data of the row L1 to the recording head 7 at half the recording time, the line data of the next row L3 is transferred and recorded. At this time, recording can be performed using the recording head 7 that is heated almost uniformly.

When the line data D of the next row, row, is input to the recording control section 4, the recording control section 4 turns off the inverter 6 again, and outputs a signal corresponding to the data of row, to the driver 5. Since the inverter 6#'i is off, the signal output from the driver 5 is not inverted and is input to the recording head 7 as it is, so that row L is recorded on the recording paper 9. . The same applies below.

What has been described above can be summarized in the processing flowchart of the recording control section 4 shown in FIG.

First, the power is turned on and initialization is performed (STI)
. Next, it is determined whether the line data has been transferred (S
T2), if the line data has been transferred (8T2 Y
), the data corresponding to the line data is transferred to the driver 5 (5T3), and the process returns to ST2. If line data has not been transferred in ST2 (N in ST2), it is determined whether the recording paper 9 has moved by one line (ST
4).

If it has not moved by one line yet (N in ST4), the step motor 10 is driven (ST5) and the inverter 6 is turned on (ST6). In ST4, if the recording paper 9 has finished moving for one line (Y in ST4), ST5
The process proceeds to driving processing for the inverter 6 (ST6).

When the inverter 6 is turned on (ST6), the process advances to ST3, and similar processing is performed thereafter.

In this embodiment, the inverted pattern is formed by the inverter 6, but the invention is not limited to this; the recording control section 4 is provided with two memories for recording data, and one is used to store normal recording data. , the inverted recording data may be stored in the other, and each data may be sent to the driver 5 at the same timing as in this embodiment.

Further, the thermal recording device according to the present invention can preheat the entire area of the recording head even though there is no recording portion on the previous line when the power is turned on, and thus enables efficient preheating.

〔Effect of the invention〕

As explained in detail above, the thermal recording device according to the present invention has the great effect of being able to obtain sufficient and uniform recording of 14 degrees due to its narrow configuration.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the effects of two recordings, master turns and preheating on recording paper by a conventional thermal recording device, and FIG. 2 is a professional diagram showing the configuration of an embodiment of the thermal recording device according to the present invention. FIG. 3 is an explanatory diagram showing the recording pattern on the recording paper and the influence of preheating according to this embodiment, and FIG. 4 is a processing flowchart of this embodiment. 1.9... Recording paper, 4... Recording control section, 5... Driver, 6... Inverter, 7... To recording, P0 Figure 1 sI2 Figure

Claims (2)

[Claims] (1) A thermal recording device characterized in that it is provided with means for inverting the pattern of previous line data, and the recording means is preheated by the output of the inverting means. (2) The thermal recording apparatus according to claim 1, wherein the preheating is performed from immediately after recording the previous line data to immediately before recording the next line data.