JPS63221058A - Thermal recording apparatus - Google Patents

Abstract

PURPOSE:To prevent the non-uniformity of recording density, by detecting the power supplied to a thermal head to store the same and operating the resistance values of a plurality of heat generating resistor elements on the basis of the memory value to control the power supplied to the thermal head. CONSTITUTION:A switch SW is connected to a contact A to record the data from a test recording data input means D2 by a thermal head T and the power consumption at that time is detected by an applying voltage detection sensor S to be compared with standard power consumed when the heat generating resistor of the thermal head T shows a standard value and the resistance value of the heat generating resistor corresponding to the power consumption detected by the operation is calculated to be stored in a memory M. Next, the resistance value of the heat generating resistor stored in the memory M is read and a condition to be recorded, for example, a power supply time is operated on the basis of the read resistance value and recording due to the recording data inputted from an image recording data input means D1 is carried out by the thermal head T.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a thermal recording device, and more specifically, a plurality of heating elements are arranged in a recording head, and recording is performed by controlling the voltage applied to the heating elements. The present invention relates to a thermal recording device.

[Conventional technology]

In this type of recording device, which is generally called a line-type thermal recording device, an applied voltage is supplied to a plurality of heating elements arranged in a row, that is, heating resistors, to generate heat, thereby making thermal sensitive or thermal transfer recording possible. However, the heating resistor has variations in its resistance value, and there are also errors in the applied voltage, which affect the recording conditions.

(Problems to be Solved by the Invention) In other words, in conventional thermal recording devices of this type, there is no means for detecting variations in the resistance value of the heating elements, so the recording density is not controlled uniformly and the recording quality is impaired. There was a risk.

Therefore, an object of the present invention is to focus on the above-mentioned conventional problems, and to
In order to solve this problem, it is an object of the present invention to provide a thermal type recording device that can always calculate the resistance value of a thermal head and can perform recording control corresponding to the resistance value.

Means for Solving Problem C] In order to achieve this object, the present invention has a thermal head in which a plurality of heating resistor elements are arranged, and the heating resistor elements are heated by supplying power to the thermal head. In a thermal recording device that performs recording by generating heat, a means for detecting electric power supplied to the thermal head;
means for storing the detected power value; means for calculating the resistance values of the plurality of heating resistor elements based on the stored power value; The apparatus is characterized by comprising means for controlling electric power supplied to the head.

[Effect]

According to the thermal recording device of the present invention, the power consumption supplied to the thermal head when data for test recording is input and recorded is detected, and the resistance value of the thermal head calculated from the power consumption is stored in the memory. By doing so, when inputting new desired recording data, the applied voltage to be supplied to the thermal head is controlled based on the above-mentioned resistance value, so high-quality recording with uniform recording density is always achieved. It can be implemented.

〔Example〕

Embodiments of the present invention will be described in detail and specifically below based on the drawings.

FIG. 1 shows an embodiment of the present invention, where T is a line-type thermal head in which a plurality of heating resistors are arranged, a voltage is applied to the thermal head T from a power supply Vcc, Thermosensitive or thermal transfer recording is performed on a recording material (not shown). C is a recording control unit equipped with a CPU function that controls the recording signal supplied to the thermal head T, S is a sensor that detects the power consumption supplied to the thermal head T from the power supply Vcc, and M is a test recording unit as described later. When the data for the sensor S is input manually to the thermal head T,
This is a memory for recording and storing the resistance value of the heating resistor calculated from the power consumption detected by.

Here, Dl is an image recording data input means, Dl is a test recording data input means, and these input means are connected to the recording control section C via a switch means SW. When connected to the A side, test recording data can be recorded on the thermal head, and when connected to the contact B side, image recording data can be recorded in the same way.

Next, the control operation in the thermal recording apparatus constructed in this way will be explained with reference to FIG.

First, in step S1, it is determined whether the thermal head T5 is in a mode for detecting the resistance value of the heating resistor provided in the thermal head T5, and if the mode is for detecting the resistance value, the process proceeds to step S2. , switch S
Connect W to contact A side. Thus, in step S3, the data input from the test recording data manual means D2 is recorded by the thermal head T, and the data is recorded in the next step S4.
The sensor S detects the power consumed by the thermal head T at that time.

If the power consumption is detected, the process proceeds to the next step S5, where the detected power consumption is calculated by comparing it with the standard power consumed when the heating resistor of the thermal head T is at the standard value. The heating resistor resistance value corresponding to the electric power is calculated and stored in the memory M.

Now, preparations for inputting the target recording data are complete, and the process returns to step S1 again. If it is determined in step S1 that the resistance value detection signal is not detected, the process branches to step S6, the switch SW is connected to the contact B, and the heating element resistance value is stored from the memory M in the next step S7. is read out, and the process proceeds to step S8, where conditions for recording, such as energization time, are calculated based on this resistance value, and in step S9, recording is performed using the recording data inputted from the image recording data manual means D1 by the thermal head T.
Implemented by

〔Effect of the invention〕

As described above, according to the present invention, there is provided a means for detecting the electric power supplied to the thermal head, a means for storing the electric power detected by the electric power detecting means, and a means for detecting the electric power supplied to the thermal head. A means for calculating the resistance value of the heat generating resistor element provided is provided, the power consumed when predetermined recording data is recorded is stored, and the resistance value of the heat generating resistor element is calculated from the power consumption. Since the power supply conditions corresponding to the resistance value are determined, it is possible to prevent uneven recording density due to variations in the resistance value, etc., and to perform high-quality recording.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of the thermal recording device of the present invention, and FIG. 2 is a flowchart showing the procedure of control operations controlled by the thermal recording device of the present invention. T...Thermal head, C...Recording control unit, M...Memory, S...Power detection sensor, Dl...Image recording data input means, Dl...Test recording data input means, SW ···switch.

Claims (1)

[Scope of Claims] A thermal recording device having a thermal head in which a plurality of heat generating resistor elements are arranged, and recording by causing the heat generating resistor elements to generate heat by supplying power to the thermal head, comprising: means for detecting the power supplied to the thermal head; means for storing the detected power value; and means for calculating the resistance values of the plurality of heating resistor elements based on the stored power value. and means for controlling power supplied to the thermal head based on the calculated resistance value.