JPS6083861A - Color transfer printing system - Google Patents

Abstract

PURPOSE:To perform lap-transfer with a predetermined ink amount, by driving a thermal head by energy corresponding to the transfer amount of ink up to the previous color. CONSTITUTION:In order to perform lap-transfer, an ink sheet 4 is subjected to feed control in a printer driving part 6 and a thermal head 1 is driven corresponding to recording data of each color by a head driving part 7. The recording data of each color is temporarily stored in a data memory part 8 and the whole of the system is controlled by a controller part 9. The thermal head is driven by energy corresponding to the transfer amount of ink up to the previous color calculated by reading the gradation level of recording data and the recording data up to he previous color stored in the data memory part and transfer density is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color transfer method in a thermal transfer type color recording device.

Conventionally, in this type of thermal transfer type color recording device, yellow Y, magenta 4. 3 by subtractive color mixing of cyan C
Using the primary color color ink sheet 1-, the drive power or drive pulse of the thermal head is varied according to the recording data of each color to change the diameter of the transfer drum, thereby expressing intermediate tones, and then printing each color. By sequentially overlapping and transferring ink, multicolor (full color) color expression is achieved. However, when performing color recording by such 1" (ne transfer), as shown in Figure 1, even if the first and second colors are 1E or the second color is 11 or later, Since the transfer conditions differ depending on the ink being transferred to the print head, even if the same gradation data is applied and the thermal head is driven with the same energy, the ink transfer cannot be performed with the same amount of ink. However, it has become impossible to obtain the prescribed degree.

The present invention was made in consideration of the above points, and when performing color recording by wheel transfer, from the second color onwards, the ili+; To provide a color transfer method that enables insect transfer using a predetermined amount of ink.

Saki Hereinafter, embodiments of the present invention will be described in detail.

In the color 11t7 copying method according to the present invention, the gradation level of the recorded data and the Jl,
The transfer density is controlled by moving the print head 1-1 with an energy corresponding to the amount of ink transferred up to the previous color determined by reading the recorded data up to the previous color, and the ink of each color is transferred in layers. This allows a predetermined color to be expressed by

Below, yellow Y, magenta M, cyan C, and black 13 are scanned in the order of the field sequential method, and the image size is 1512 x 512.
A detailed explanation will be given of a place where a multi-colored multi-tone multi-gradation process is performed using pixels.

FIG. 2 shows an example of a configuration for implementing the color transfer method according to the present invention, which includes a therma, a V-head 1, and a platen 2 in which heating elements (512 elements) for one line are arranged in the main scanning direction. A printer section 5 sequentially performs recording for each I run while pressing the recording paper 3 and the color ink sheet 4 in pressure contact with each other and feeding them in a sub-scanning manner, and a printer section 5 that controls the feeding of the ink sheet 4 for overlapping transfer. A printer drive section 6 that drives the thermal head 1 according to the recording data of each color, a head drive section 7 that drives the thermal head 1 according to the recording data of each color, a data memory section 8 that temporarily stores the recording data of each color, and controls the entire system. controller 1 and roller section 1].

FIG. 3 also shows the head drive 1i 14 section 7 in the same embodiment.
, a specific configuration example of the data memory section 8 and controller 1 roller section 9 is shown. In the configuration shown in the figure, there is a program ROM 1 and a control RAM on the CPU bus.
I is connected. The ROM+ stores a table for controlling the programmer 1 and the head drive 11S. Further, RAM1 is used as a variable area, etc. The head drive time control table stores data that allows the drive time of the thermal head 1 to be controlled in 16 levels, and as shown in Figure 4, the data includes ink transfer up to the previous color. -fil: PI,
C can be set by determining the relationship between the head immediate energy and the transfer density through experiments using P 2 and P 3 as parameters. The counter CN1 counts up every 11 clocks sent from the clock control circuit kli CL , K. Go to Iku△. 12.1? ! ΔM3, RΔN・
14 and R A M 5 are the names 1 ra (n (1) ”
l', M, C, J. ;、Up to 1 day<08 Store data in the color record 51 5 1 ::!
There is also a capacitor 1i of the
1. cotton or 1 in a row, 1 shi. Also RAM 2,
R-1\1~4:1, R△~I/I, l
't Each input terminal of A M5 has a hide (not shown), an interface, and a color conversion circuit (RG13→Y84(:).

Halftone conversion circuit (IQl is the teaser processing circuit ilIl',
) 4 letters [.

"l', M, C:, 13K
each recorded data] and it is given. , l+f1
Flash 2 is RAM2-12. Read each from A M 5,
7, the recorded data of each 2 bits 1- is outputted according to the amount of ink transferred up to the previous color. 71 bits 1- that is, 16
It is for conversion so that the drive 11t1j11 of the thermal head 1 can be controlled by the level, and its address terminal has a total of 8 pins 1- from each data output terminal of RAM2=RAM5 in the previous stage. Signals and Y, M, C, BK from I10 boat of controller 1 to roller section 9
The selection signal of 2 pins 1- is connected, and the output data of the conversion ROM 2 has 28 combinations considering the amount of ink transferred up to the previous color when transferring BK. The ideal is 8 pins, but if you set it to 8 bins, the head drive time will be regulated at the 256 level, and if you use a line drive type thermal head, you will have to roll one line. Since the required distance I, 1゛ becomes long, it is approximated by 4 hits (81 novels). Further, the output of 4 hints of R OM 2 is given to one input terminal of the comparator circuit CMP. The other base of the comparator circuit CMP is confirmed: the input terminal is connected to the
- A 4-bit comparison standard is obtained from I10 port 1 of the roller section 9. The comparator circuit (CMI) is designed to switch its output from low level to high level when the human input data equals the quasi data and becomes 7, and the parallel/serial output of the recording data sent to the thermal head 1 is This is a -f' interface for conversion. The eight drive unit 7 is composed of one line of shift register 1, SL<, latch L, C', 11, and an AND circuit, and serially records the recording data of each color. It is done manually (I can say 151 parallel movements). That is,
The data of each 1 hiso l~ from the ratio 1 limb circuit CM l-' is transferred to line shift 1 in register 1. in synchronization with the shift clock cJoch. , A l; Latch the data for [, 1 in ΔU'
(The controller section 9 then AN
Static [+-) signal S l; r n +10 to D circuit
Ij is the pulse period, and each heating element toward the 4J-maru head j is driven to generate heat in accordance with the data.

With this configuration, 1. +i and jQ in the thermal transfer method according to the present invention 7.1, Cl'I
Under the control of IJ, color recording is performed by overlapping transfer as described above.

First, a line feed is performed by controlling the printer drive unit 6, and then a WRITE start signal is applied to the clock control circuit CLK. The counter CN T is driven by JL, and 71-res is sequentially counted from zero to 1.
- At the same time, the write signal WR is changed to each RAM2 to RΔM5.
, M, C, and BK are written respectively.

Next, a selection signal of Y is given to ROM2, and I
Compare the data of 000■ indicating that the level is 21 to 1
1i2 groups? (Q is given to the comparator circuit CMI). Thereafter, a RE A D start signal is sent to the clock control circuit CLK to sequentially raise the counter CNT by 1 hair from zero, and a read signal l<1] is output to each RAM2 to RΔM5. The recording data of Y selected from the data of 1 line/1) is l,
j (1) The data of Lebel "1" is read into M2, converted, and passed through the comparator circuit CM P.
1".

Data with other levels is reset to "0" and sent to the thermal head 1 (line shift register LSR).
Transfer one line serially. That line shift 1
- When the 11-Ay data of one line is in the register T, SR, the 1atch signal is output.''
The transproduct data in register LSR is transferred to latch LATCI+ in parallel and held, and then the CPU refers to the head drive time control table in ROM1 to drive I10 for the time corresponding to the rubel number.
S L r o Doshinsou is issued through Bo 1~, and each ripeness corresponding to one line's worth of data; j°・111
~ I (5L 2 is driven appropriately. The following operation is repeated for each line of recording data of Y up to 16 levels. Nail C will be made up to 512 line 11.Next, write 5 in the same way as 1) ijjho for each of the recorded Ij-data in M, C, and 13. Do it, jll, so; l+, L:, the predetermined ink Mk is also 1] without depending on the R link transfer purchase of the previous color. J< become able to do it.

As shown in Figure U, in the color transfer method according to the present invention, in a thermal transfer recording device that performs color recording by overlapping transfer, the gradation level of recorded H data and up to one fat color stored in the data memory section are This method controls the transfer density by driving the thermal head with energy according to the amount of ink transferred up to the previous color determined by reading the recording data, and transfers the ink of the previous color r+[ It has the excellent advantage that the overlapping rotation 'lj can be made constant with constant ink M& without depending on the amount of ink, thereby making it possible to optimally perform color recording with a predetermined density. .

[Brief explanation of the drawing]

Fig. 1 is a diagram showing various transfer conditions when performing color recording by overlapping transfer, and Fig. 2 shows an example of a configuration for concretely implementing the color transfer force type according to the present invention. Block diagram, Fig. 3 is a program diagram showing an example of the configuration of the head drive section, data memory section, and controller section in the same embodiment, and Fig. 4 is a diagram showing Φ with respect to transfer energy.
No2's concentration! 11j gender chart. Tozamarugeno 1-2 Platen 3-... Note tit
, fd'c11... Color Ink Sea 1-5... Printer section 6. Printer drive section 7. Head drive section 8.. Data memory section 9. Controller 1-Roller section Applicant's agent Karasuno 1 Ih Figure 1 Figure 2

Claims (1)

[Claims] In a thermal transfer recording device that performs color recording by overlapping transfer, the amount of ink transferred up to the previous color determined by reading out the gradation level of the recorded data and the recorded data up to the previous color stored in the data memory section is A color transfer method that controls the color of the transfer by driving a thermal head with a light beam.