KR940007487B1 - Temperature and pressure control device and method in cvp - Google Patents

Abstract

The apparatus and method includes an input part for generating temperature and pressure setting data according to a switch value set by a user, a microcomputer for comparing the temperature sensing data with the value of the input part, and if the data reaches a predetermined value, outputting the sensing data, a head controller for applying a video signal for a period of strobe signal, a motor servo for generating a head motor driving signal, a head for heating a heat emitting body and printing a video signal on paper, a pressure detector for sensing the pressure state and outputting it to the fourth port of the microcomputer, a temperature detector for sensing the temperature of the heat emitting body and outputting it to the fifth port of the microcomputer, and a display for displaying the pressure and temperature data of the head.

Description

Temperature and pressure control device and method of color video printer

1 is a configuration diagram of a color video printer according to the present invention.

2 is a concrete circuit diagram of FIG.

3 is an operation timing diagram of FIG.

4 is a flow chart of the present invention.

* Explanation of symbols for main parts of the drawings

11: microcomputer 12: input unit

13 temperature sensing unit 14 pressure sensing unit

15: display unit 16: motor servo unit

20: head portion 21: TPH

22: ink cassette 23: recording paper

24: drum

The present invention relates to an apparatus and method that can improve the quality of a printed image by enabling adjustment of temperature and pressure levels of a thermal printer head (TPH) in a color video printer.

In general, when a color video printer heats a heating element embedded in a thermal head (hereinafter referred to as TPH), a ribbon (or dye) in close contact with the TPH is sublimed onto a recording sheet to reproduce an image. At this time, the density of the image varies depending on the temperature and pressure of the TPH. In other words, when the temperature of the TPH is high, the density of the image is high, and when the temperature is low, the density of the image is weak. In addition, as the pressure between the TPH and the recording paper increases, the image density increases, and when the temperature is low, the image density decreases. However, in the conventional color video printer, there is no function to vary the applied pressure of the TPH or to set the temperature of the TPH. Therefore, there was a problem in that the image display according to the pressure video signal was very limited without the function of increasing or decreasing the density level of the image when the applied video signal was reproduced as an image.

It is therefore an object of the present invention to provide an apparatus and method capable of varying the temperature and pressure of a head in a color video printer.

It is still another object of the present invention to provide an apparatus and method for displaying the head state by sensing the pressure and temperature of the head in a color video printer.

Hereinafter, the present invention will be described in detail with reference to the drawings.

An input unit 12 for setting the pressure temperature level by a switch, and an output of the input unit 12 through a first port, and generating a pressure control motor control signal to a third port according to the input data, After generating the temperature-variable strobe signal to the port and receiving the pressure sensing data to the fourth port and receiving the temperature sensing data to the fifth port and comparing it with the set pressure and temperature values, the sensing data reaches the set value. The head control unit for applying the video signal received during the period of the microcomputer 11 for outputting the sensing data to the second port and the straw signal output to the sixth port of the microcomputer 11 to the TPH 21 ( 7) and a motor servo unit 16 for generating a head motor driving signal for adjusting pressure between the TPH 21 and the drum 24 by a motor control signal output to the third port of the microcomputer 11. Wow TPH (21) for adjusting the pressure and the recording paper 23 by the head motor driving signal, heating the heating element during the strobe signal period output from the head control unit 7 and printing a video signal on the recording paper (23), A pressure sensing unit 14 configured to detect a position of the TPH 21 and detecting the pressure state according to the opening / closing state of the switch and outputting the pressure to the fourth port of the microcomputer 11, and the TPH ( Detects the temperature of the heating element of the 21 and outputs the temperature sensing unit 13 for outputting to the fifth port of the microcomputer 11 and the pressure and temperature data of the TPH 21 output to the second port of the microcomputer 11 It consists of the display part 15 to display.

FIG. 2 is a detailed circuit diagram of the periphery of the microcomputer 11 of FIG.

3 is an operation timing diagram of the microcomputer 11, in which the microcomputer 11 controls the head control unit 7 and the motor servo unit 16 according to the temperature and pressure control command of the input unit 12. The procedure for controlling the temperature and pressure of the gas is shown.

FIG. 4 is a flowchart of the operation control of the microcomputer 11, and illustrates a process of setting the TPH 21 to a set temperature and pressure after receiving a set value of the temperature and pressure of the input unit 12.

Based on the above configuration, the present invention will be described in detail with reference to FIG.

The color video printer receives an analog video signal, converts it into a digital signal, and applies it to the heating element of the TPH 21. Then, the heating element of the TPH 21 is invented according to the video signal applied during the period of the strobe signal STB, and the heating element applied heat is applied to the ink cassette 22. At this time, the ink of the ink cassette 22 is surface-sequential for each color, sublimed onto the recording paper 23, and reproduced as an image. At this time, an appropriate amount of pressure is applied from the TPH 21 to the drum 24, and a strobe signal STB of a predetermined period for driving the heating element should be applied. In this case, if the period of the strobe signal applied to the TPH 21 is high or the pressure level is high for the same image, the optical density is increased and the printed image is darkened, and the period of the strobe signal is short or the pressure level is The lower the light density, the lighter the printed image.

Look at the above process in detail.

First, the processing of the video signal will be described.

When the video signal is received, the image signal processing unit 2 divides the image into luminance and color signals and processes the image, and the A / D conversion unit 3 outputs the analog video signal outputting the image signal processing unit 2 to the digital video. Convert to a signal. The image controller 1 then stores the output of the A / D converter 3 in the image memory 4. Thereafter, the digital video stored in the picture memory 4 is read by the image controller 1, and this digital video signal is converted into an analog video signal by the D / A converter 8, and then the monitor 9 Is displayed.

In addition, the output of the image memory 4 is printed as an image through the TPH 21, the line memory 5 in accordance with the discrepancy between the time displayed on the monitor 9 and the time printed through the TPH 21 Use

Therefore, the output of the image memory 4 stores the line unit to be printed in the line memory 5, so that one line of the digital video signal stored in the line memory 5 is the intermediate data section 6; Gamma ( Halftone processing is performed by halftone data for correction and color correction and is applied to the head control unit 7. At this time, the halftone data is applied to the halftone data 6 through the seventh port P7 in the microcomputer 11, and the halftone data section 6 receives the received digital video signal by the halftone data. Gamma correction and color correction are performed. Thereafter, the head controller 7 is applied to the TPH 21 during the strobe signal STB period for outputting the sixth port P6 of the microcomputer 110 to the digital video signal for outputting the halftone data (7).

Then, the heating element of the TPH 21 is heated by a video signal applied thereto, and heat generated by the heating element is applied to the ink cassette 22 to print the image on the recording paper 23. At this time, the density of the printed image is varied depending on the temperature of the separate heat of the TPH 21 and the pressure with the drum 24.

After setting the exothermic temperature and pressure of the TPH 21 to an appropriate level, the process of detecting and displaying the actual state of the TPH 21 will be described.

First, the operator of the color video printer controls the switch 21 to set the set temperature, and the switch 22 controls the set pressure. Then, the microcomputer 11 stores the set temperature and the pressure value generated through the input unit 21 through the first port P1 in the internal memory.

When the set temperature and the pressure value are received through the first port P1 as described above, the microcomputer 11 operates as shown in FIG. 3.

First, the process of controlling the exothermic temperature of the TPH 21 will be described.

When the set temperature value is generated through the switch 21 of the input unit 12, the microcomputer 11 recognizes the temperature control command through the first port P1 (3A) and internally sets the corresponding temperature value to the set temperature. Store in memory. Thereafter, the microcomputer 11 generates the strobe signal STB through the sixth port P6 as shown in 3 (B). Then, the head control unit 7 applies the digital video signal outputting the halftone ray unit 6 to the TPH 21 during the period in which the strobe signal STB is supplied. Then, the TPH 21 generates the corresponding heating element by the digital video signal received during the strobe signal STB period. The signal generated by the heating element of the TPH 21 is converted into an electrical signal and applied to the temperature sensing unit 13, where the temperature sensing unit 13 converts the received heating signal into a digital signal to the microcomputer 11. Is applied to the fifth port P5. Then, the microcomputer 11 outputs temperature data of the TPH 21 by comparing the actual temperature of the TPH 21 received through the fifth port P5 with the set temperature stored in the internal memory as shown in (3C). The temperature display part 51 of the display part 15 displays the temperature value which outputs the said 2nd port P2. The temperature display section 51 displays the temperature value as numeric data as a seven-segment.

Second, look at the process of controlling the pressure of the TPH (21).

When the set pressure value is generated through the switch 22 of the input unit 12, the microcomputer 11 recognizes the pressure adjustment command through the first port P1 as shown in 3D, and sets the pressure value as the set pressure. Store in internal memory.

Thereafter, the microcomputer 11 outputs the head motor control signal through the third port P3 as shown in 3E. When the head motor control signal is output through the third port P3, the head motor driving unit 61 of the motor servo unit 16 is driven to adjust the position of the TPH 21. At this time, the head motor driving unit 61 drives the head motor of the DC motor (DC motor) according to the head motor control signal value of the microcomputer 11 by the head motor driving unit 61 of the microcomputer 11. Pressure between the drum and the drum 24). When the position of the TPH 21 is changed as described above, the pressure detecting unit 14 detects the position of the TPH 21 and applies it to the microcomputer 11 through the fourth port P4. The pressure sensing unit 14 is composed of a plurality of switches, and performs the operation of opening and closing the switches as the position of the TPH 21 is moved. When the pressure value of the TPH 21 is received through FIG. 4 as described above, the microcomputer 11 compares and analyzes the set pressure value stored in the internal memory and the received actual pressure value as shown in (3F), ( 3G) outputs the pressure value measured through the second port P2. Then, the pressure display unit 52 of the display unit 15 displays the pressure value output through the second port P2. In this case, the pressure display unit 52 is also composed of 7-segment.

After setting the temperature and pressure of the TPH 21 as described above, the control procedure of the microcomputer 11 for displaying the state of the TPH 21 through the display unit 15 is shown with reference to FIG.

First, when key data is received through the first port P1, the microcomputer 11 checks whether the received data is temperature setting data or pressure setting data. At this time, if the temperature setting data is recognized in step 402 and stored as a set temperature value in the internal memory. Thereafter, through the steps 403 and 405, the strobe signal STB is supplied to the TPH 21 to generate heat to a set temperature. In the process, the microcomputer 11 outputs the strobe signal to the sixth port P6 until the sensing temperature value received from the temperature sensing unit 13 through the fifth port P5 is equal to the set temperature. In this case, if the detected temperature and the set temperature are the same, it is recognized in step 405, the strobe signal is disabled, and in step 406, display data is output through the second port P2. Then, the temperature display unit 51 of the display unit 15 displays the temperature output from the microcomputer 11.

In addition, if the received data is pressure adjustment data in which the TPH 21 is set to a specific pressure, it is recognized in step 407 and stored as a set pressure value in the internal memory. Thereafter, the head motor driving signal is output through the third port P3 so that the TPH 21 can be moved to a set pressure position through steps 408 and 410.

In the process, the microcomputer 11 outputs the head motor driving signal through the third port P3 until the detected pressure value received from the pressure sensing unit 14 through the fourth port P4 is equal to the set pressure value. .

At this time, if the set pressure value and the set pressure value is the same, the microcomputer 11 recognizes this in step 410 and disables the head motor driving signal, and in step 411 the display pressure through the second port P2. Print the data. Then, the temperature controller 51 of the display unit 15 displays the detected pressure value. The temperature and pressure settings are set in the initial stage before printing the actual image.

As described above, in the color video printer, the head pressure and temperature value can be varied, so that the density of the printed image can be arbitrarily changed, and the head pressure and temperature of the color video printer can be displayed to effectively use the system. There is an advantage to this.

Claims (2)

A color video printer device comprising: an input unit having a switch for setting temperature and pressure values, the input unit for generating temperature and pressure setting data according to a switch value set by a user, and outputting the input unit to a first port; And a pressure variable head motor control signal to a third port according to the received data, a temperature variable strobe signal to a sixth port, and a fifth port to receive pressure sensing data at a fourth port. After receiving the temperature sensing data to compare the set pressure and temperature value, the microcomputer outputs the sensing data to the second port when the sensing data reaches the set value, and outputs the sixth port of the microcomputer 11 A head controller for applying a head to a video signal received during a period of the strobe signal, and outputting the third signal to the third port of the microcomputer. The motor servo unit generates a head motor driving signal for adjusting pressure between the head and the drum by a head motor control signal, and the pressure of the drum is adjusted by the head motor driving signal. The head is configured to heat the heating element during the output strobe signal period, and prints a video signal on the recording paper, and a plurality of switches for determining the position of the head. A pressure sensing unit for outputting to a port, a temperature sensing unit for sensing a heating element temperature of the head and outputting it to a fifth port of the microcomputer, and displaying pressure and temperature data of the head output to the second port of the microcomputer Temperature and pressure control device of a color video printer, characterized in that the display portion. In the temperature and pressure control method of a color video printer, when data is generated through an input unit, the data is stored as setting data and the received data is analyzed and the received data is received by enabling the temperature setting data temporary strobe signal. Heating the heating element of the head according to the video signal, receiving the detected temperature of the head heating element, comparing the temperature setting data, repeating the heating process when the temperature is lower than the setting temperature, and setting temperature in the comparing process. Displaying and terminating the sensing temperature received at the time of abnormality; and controlling the head pressure by changing the drum and the head position by outputting the head motor control signal when the received data is pressure setting data; and changing the head position value. Received and compared with the pressure setting data, The head temperature and pressure control of the color video printer, characterized in that it comprises the step of repeating the step of adjusting the pressure when the pressure is less than the pressure, and displaying the detected pressure value received when the received data is more than the pressure setting data, and terminating Way.