JPS59221168A - Recording system - Google Patents

Abstract

PURPOSE:To obtain a picture with high quality by detecting a profile of picture information and increasing an energy applied to the profile more than the applied energy to other parts so as to prevent deterioration in the picture. CONSTITUTION:A picture information data is applied to one line shift register (SR) 1 and also to an FF 3. FFs 3-6 are used for 1-bit delay so as to form left and right bits of a recording line. Further an SR 2 is to form lines before and after the recorded line. In feeding a recording chart from downward to upward direction, the profile of a lower side, lateral sides and an upper side is outputted respectively from gates 7, 8 and 9 by using an output of the FF 4 as an original data. Then a gate 10 adds the upper side to the lateral sides, a gate 11 adds an output of the gate 10 to the lower side and the result is inputted to one-line memories RAMs 12-15. Each output of the RAMs 12-15 is selected by a selector 16 and a signal of the profile is selected so that the applied pulse width is longer than that of the original data.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording system for facsimiles, printers, etc., and particularly to a recording system that improves image quality by increasing the energy applied to contour areas where printing is difficult.

BACKGROUND TECHNOLOGY In general, in a thermal recording device, when driving a thermal head, depending on the heat storage state and heat diffusion state of each bit,
The required applied energy to obtain good quality is different. That is, when a certain heating element is driven to the previous line, it is necessary to apply less energy than when it is not driven.

This amount varies depending on the recording speed and the configuration of the recording head, but for example, in the case of a recording speed of 5 m5ec/line, 60% to 8
It will be about 0%. Therefore, conventionally, the relationship between the recording interval time that gives the planned density and the time width of the recording power pulse is memorized in advance, and the actual recording interval time is measured for each heating element, and the thermal drive is performed according to the measurement result. However, the configuration was complicated. In addition, the required energy to be applied differs depending on whether there are dots on the left or right in the line to be printed, and if there are dots on the left or right, it is possible to use less energy than in the case of a single dot. This amount also varies depending on the configuration of the recording head, but is approximately 90%. In this regard, in the above-mentioned recording method, since there is no control over the presence or absence of left and right dots, a sufficiently high quality image cannot be obtained. When 81 is driven with the same energy, if the previous line is white Pit 1, problems arise such that the density of the image of the bit concerned is low or the dot size is small.

Furthermore, if a large amount of applied energy is applied so that the dots take appropriate values, the internal bits of the image become over 1-live, resulting in image deterioration, which becomes more noticeable as the recording speed increases. Furthermore, a method has been proposed in which only the outline is recorded when the heat accumulation in the head exceeds a certain value, but this method has the disadvantage that the image inside the outline is omitted.

Purpose The present invention aims to obtain a high-quality image by detecting the outline of image information and controlling the applied energy to the outline part that is difficult to print, in order to prevent the above-mentioned image deterioration.

7-1 The structure of the present invention will be described below based on Examples.

FIG. 1 is a block diagram showing an embodiment of the present invention.
The image information DATA is input to a 1-line shift register 1, and its synchronized output is input to a 1-line shift register 2. This is to create the previous line and the next line of the recording line. Flip-flops 3-6 are for one-bit delay, which produce bits to the left and right of the bit of the recording line. When the recording paper is fed from the bottom to the top, if the output of the flip-flop 4 is the original data that is not manipulated, the output of the gates 1-7 will be the bottom edge of the image information, and the output of the gate 8 will be the side edge, The output of gate 9 becomes the contour of the upper side.

Next, a gate 10 calculates the sum of the contours of the upper side and the side, and a gate 11 calculates the sum of the output of the gate 10 and the contour of the lower side.
4.15 entered. At this time, all of the image information (original data) is input to the RAM 12, and the sum of the contours of the top, side, and bottom sides of the image information is input to the RAM 13.
The sum of the contours of the two sides and side edges of the image information is manually input into M14, and the sum of the contours of the upper side of the image information is input into the RAM 15.

Next, when data input to RAM 12 to 15 is completed,
Let's move on to the record. Each output A of RAM12-15.

B, C, and D are selected by the selector 16. Selector 1
The selection at 6 is performed using signals 5ELCTI and 5ELCT2. The thermal head 17 includes a one-line shift register 18, its latch 19, a driver 20, and a heating element 21.

FIG. 2 shows time charts 1 to 1 of transfer and drive.

It is assumed that the data transfer lock CLK2 is sufficiently fast and can transfer one line within the interval of control precision of the applied pulse width.

First, data D of the upper edge contour is transferred. When the transfer is complete, the LOAD signal is output, latched to the head,
At the same time, the heating element on the upper contour portion is driven.

Next, the data of the top edge + side edge contour portion C is transferred and launched, and the side edge edge portion is added to the drive of the top edge edge portion.

Similarly, upper edge + side edge + lower edge contour part B and then full image information A are transferred, latched and the heating element is driven, and finally Re
Driving of that line is stopped by the signal s e .

The applied pulse width inside each contour part is as shown in Figure 2,
The length of the pulse width can be controlled by the timing of the LOAD signal.

Note that the lower contour part may have the same energy as the inside of the image, but when the heat accumulation in the thermal head becomes large and it becomes necessary to reduce the total power, the input energy can be reduced by reducing only the applied energy inside the image. reduce
Moreover, in order to print normally on the contour portion, the energy applied to the lower contour portion can also be controlled.

Effects As described above, according to the present invention, the outline of image information is detected,
The image is separated into the top, side, bottom, and inside of the contour, and the energy applied to each is controlled, preventing image deterioration caused by the thermal head's heat storage and heat diffusion conditions, and producing high-quality images. Obtainable.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a time chart. 1.2...Shift register, 3-6...D flip-flop, 7-11...Gate, 12-15...RA
M, 16...Selector, 17...Thermal head, 1
8... Register to shift 1, 19... Latch circuit, 2
0... Driver, 21... Heating element.

Claims (2)

[Claims] (1) In a recording device using a thermal head, a detection means for detecting the outline of image information is provided, and the energy applied to the detected image axis area is set to be higher than the energy applied to the image area excluding the outline area. A recording power type that is characterized by driving the thermal head to do this. (2) A means is provided for separating the shaft outline into an upper outline, a side outline, a lower outline, and an image part that is not an outline, and the amount of applied energy is applied to the upper outline to the largest, then to the side. Claim (1) characterized in that the side contour portion is enlarged, and then the lower side contour portion is enlarged, and the image portion that is not the contour portion is driven so as to be equal to or smaller than the lower side contour portion. Recording method described.