JPS6394863A - Thermal transfer recording system - Google Patents

Abstract

PURPOSE:To prevent occurrences of color shift by feeding recording paper with a length required for recoding and then recording the recording paper, while returning it in a reverse direction to a feed direction. CONSTITUTION:A thermal transfer sheet 16 and a recording paper 14 are set. Next, the thermal transfer sheet is pulled out by means of a thermal transfer sheet takeup roller 17 until the yellow head of the thermal transfer sheet is set on a heating element of a thermal head 11. In addition, the recording paper with a length required for recording is fed out by rotation of a platen roller 12. After this, the thermal head 11 is pressed against the platen roller 12, which is, in turn, rotated in a reverse direction to a direction in which the recording paper is fed out. Then while the recording paper is taken up, the thermal head 11 is energized in accordance with a recording signal to record in yellow. After recording in yellow, the platen roller 12 is rotated in a reverse direction to a direction in which recording takes place, and the recording paper is fed in a reverse direction by the same amount as that fed for recording. Next, the thermal transfer sheet is taken up until a magenta head is set on the thermal element of the thermal head 11. After this, the magenta color is used for recording, then a cyan color is used.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a thermal transfer recording method for recording color images using a thermal transfer sheet and a roll of recording paper to which three colors of yellow, magenta, and cyan are sequentially applied. It is.

[Conventional technology]

Conventionally, color image recording using the thermal transfer recording method is often performed by surface sequential recording, using a thermal transfer sheet coated with three colors of yellow, magenta, and cyan sequentially, and returning the recording paper to its original position after each color recording. A color image is obtained by superimposing the three returned colors.

There are two types of color thermal transfer recording devices: one that uses so-called paper and the other that uses rolled recording paper as shown in Figure 1. However, facsimile machines use rolled recording paper because the original size on the sending side is not constant. Paper is often used. Color image recording by the conventional recording apparatus shown in FIG. 2 will be described below.

First, the thermal transfer sheet 26 is pulled out from the thermal transfer sheet roll 25 on which three colors of yellow, magenta, and cyan have been sequentially applied, and is wound around the thermal transfer sheet winding roller 27 . Similarly, the recording paper 24 is pulled out from the recording paper roll 23 and set as shown in FIG. Next, the thermal transfer sheet is pulled out by the thermal transfer sheet winding roller 27 until the yellow head of the thermal transfer sheet 26 is set on the heating element of the thermal head 21. After that, the thermal transfer sheet 21 is pressed against the platen roller 22 with the thermal transfer sheet and recording paper interposed between them, and the platen roller 22 and the thermal transfer sheet winding roller 27 are rotated to feed the thermal transfer sheet and the recording paper while recording. The thermal head 21 is energized in accordance with the signal to perform yellow recording. After recording yellow, move the thermal drive 21 away from the platen roller 22, rotate the platen roller 22 in the opposite direction to that during recording, and change the recording ratio in the opposite direction by the same amount as the amount by which the recording paper was fed during recording. return. Next, the magenta head is placed on the heating element of the thermal head 21.
The thermal transfer sheet take-up roller 27 is rotated and the thermal transfer sheet is pulled out until it is sorted. Thereafter, in the same manner as the yellow recording, magenta is recorded, and then cyan is further recorded. After recording the three colors of yellow, magenta, and cyan in this manner, the recording paper is fed out by the platen roller 22, and is then forced and sorted by the force/shield 28, and the printing is completed.

[Problem that the invention seeks to solve]

In a color image recorded in this manner, the recording positions of yellow and magenta are likely to shift, that is, color shift occurs easily. This color shift has a negative effect on color reproduction and degree of resolution.

An object of the present invention is to provide a thermal transfer recording method for eliminating the color shift caused by the conventional thermal transfer recording method described above.

[Means for solving problems]

The thermal transfer recording method of the present invention involves feeding out a recording paper of a length used for recording, and then recording while returning the recording paper in the opposite direction to the feeding direction of the recording paper.

[Effect]

In the conventional thermal transfer recording method as described above, the color shift between yellow and magenta is large, and the color shift between magenta and cyan is quite small. This is because when recording yellow, the force required to pull out the recording paper 24 from the recording paper roll 23 (back tension of the recording paper) is greater than the force required to return the recording paper. That is, when the recording paper is moved back and forth, if the back tension of the recording paper in the past and the back tension of the recording paper in the backward movement are significantly different, a phenomenon occurs in which the amount of conveyance of the recording paper is different in the reciprocation. As a result, there is a large color shift between yellow and magenta.
A phenomenon occurs in which the color shift between magenta and cyan is small. In the present invention, after feeding out the recording paper of the length used for the recording paper, recording is performed while returning the recording paper in the opposite direction, thereby making the back tension of the recording paper almost the same during recording and returning.
This is a thermal transfer recording method that eliminates color shift.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a thermal transfer recording apparatus for explaining one embodiment of the present invention.

First, as shown in FIG.
Set 4. Next, the thermal transfer sheet is pulled out by a thermal transfer sheet winding roller until the yellow head of the thermal transfer sheet is set on the heating element of the thermal radar 11. Furthermore, the recording paper of the length used for recording is transferred to the platen roller 12.
Then, the thermal head 11 is pressed against the platen roller 12, and the platen roller 12 is rotated in the opposite direction to the direction in which the recording paper was fed out, and at the same time, while winding up the thermal transfer sheet, according to the recording signal, Thermal RAD 11 is energized and yellow is recorded. After recording yellow, move to thermal...Remove the disk 11 from the platen 12, rotate the platen roller 12 in the opposite direction to that used during recording, and move the recording paper in the opposite direction by the same amount as the amount that the recording paper was fed during recording. send. .

Next, the thermal transfer sheet and the winding roller 17 are moved until the magenta head is set on the heating element of the thermal transfer sheet 11.
Rotate and pull out the thermal transfer sheet. Thereafter, magenta is recorded in the same manner as yellow described above, and then cyan is further recorded. After recording the three colors of yellow, magenta, and cyan in this way, the recording area is moved to the platen roller 12.
As a result, the recording paper is sent upward from the cutter 18, and the cutter cuts the recording paper to complete the recording. The color images thus obtained had small color shifts between yellow and magenta, and between magenta and cyan, and were good color images.

〔Effect of the invention〕

In this way, in the thermal transfer recording method of the present invention, after feeding out the recording paper of the length used for recording, recording is performed without returning the recording paper in the opposite direction to the feeding direction of the recording paper, so that the pulled-out end of the recording paper is free. , the pack tension of the recording paper becomes smaller and the back and I tension when recording three colors becomes almost the same, so the color shift between each color is smaller compared to the conventional thermal transfer recording method, and the color reproducibility is improved. Images with excellent resolution can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a color thermal transfer recording device for explaining the thermal transfer recording method of the present invention, and FIG. 2 is a sectional view of a color thermal transfer recording device for explaining the conventional thermal transfer recording method. 11.21...To thermal throat, 12.22...
Platen roller, 13.23...Recording paper roll, 14
．． 24...Recording paper, 15.25...Thermal transfer sheet roll, 16.26...Thermal transfer sheet, 17.27...Thermal transfer sheet winding roller, 18.28...Cutter, 1
9.29...Pinch roller.

Claims (1)

[Claims] In the color thermal transfer recording method that uses a roll of recording paper and records a color image by reciprocating the recording paper by rotating a platen roller in the forward and reverse directions, after feeding out the recording paper of the length used for recording, the feeding direction of the recording paper is changed. A thermal transfer recording method that generates heat in a thermal head and records in response to a recording signal while returning the recording paper in the opposite direction.