JPS58104784A - Ink donor sheet - Google Patents

Abstract

PURPOSE:To enable bichroic recording or the copying of two sheets using plain paper by forming a solid-like ink layer fluidized or sublimated through heating to both surfaces of base paper. CONSTITUTION:The first ink layer 3A for recording black and the second ink layer 3B for recording red are shaped to the ink donor sheet 3. A thermal head 4 generates the heat of a low temperature where recording red and generates the heat of a high temperature where recording black in the first recording section A. Accordingly, recording at a high temperature is executed to recording paper 11 contacted with the ink layer 3A and the recording of both a low temperature and a high temperature to condenser paper 9 contacted with the ink layer 3B. Records transferred to the condenser paper 9 are retransferred to recording paper 11 by means of a heat roller 7 in the second recording section. The ink donor sheet 12 with both black ink layers 12A, 12B is used for simultaneous recording, and the records of the condenser paper 9 are transferred to another recording paper 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink donor sheet used as a thermal recording medium in a transfer type thermal recording device.

In a transfer type thermal recording device, a thermal pulse is applied from the thermal recording medium side with the thermal recording medium and recording paper overlapped, and -f11 information is recorded.The Oi@1 diagram is conventional. The cross-sectional structure of the thermal recording medium used is shown in Table 1. The thermal recording medium 1 has a thin base paper I made of capacitor paper or the like.
A and an ink layer IB coated on one side of the ink layer and having a specific heat transfer property. The thermally transferable ink layer IB is made of an ink that is fluidized or sublimated by heating. Such a thermal recording medium is also called an ink donor sheet.

To perform two-color recording using ink donor sheets, two types of ink donor sheets that perform recording in different recording colors and two thermal heptomes that apply heat pulses to these sheets are prepared. And recording paper (plain paper) first
The ink donor sheet is overlapped with the ink donor sheet on which recording is to be performed, and the ink donor sheet is passed directly above the heating element of a corresponding thermal head. Due to the selective transfer of ink, recording in the first recording color is thereby performed. Next, after the recording paper is separated from this ink donor sheet, it is overlapped with an ink donor sheet for the next recording color and passed directly above the heating element of a thermal head provided correspondingly. As a result, recording is performed in the next recording color.

In this way, when attempting to perform two-color recording using this spear-in and Kudner sheet tube, two sets of thermal hepts were required. Therefore, two sets of drive circuits and the like are required for each of these heads, which has the disadvantage that the apparatus becomes expensive and large.

In contrast, FIG. 2 shows the cross-sectional structure of a conventionally used thermal recording medium capable of recording on two sheets at the same time. The thermal recording medium 2 has a thermally transferable ink layer IBt formed on one side of a base paper IA, and two heat-sensitive layers formed on the remaining side. The heat-sensitive layer 2A is a layer coated with a coloring agent that develops color at a predetermined temperature higher than room temperature. A thermal pulse is applied to the ink layer IB side of the thermal recording medium 2 by a recording paper (plain paper) tjt alignment 1 thermal head. After this, the paper is separated from the medium 2. This results in
A recording is obtained on the side of the recording paper using thermal transfer ink.
The @ of the thermal recording medium 2 is colored by the coloring agent.

However, with such a thermal recording medium, not only is it impossible to record only on plain paper, but also a negative image appears on the ink layer IB@ of the thermal recording medium, which is not a loss of appearance. Ta.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a thermal recording medium capable of performing two-color recording on plain paper or two-sheet copying using one thermal head.

In the present invention, a layer of thermally transferable ink is formed on the surface of the base paper, and the above-mentioned "object t" is achieved by forming a layer of thermally transferable ink on the surface of the base paper and using an ink donor sheet.

The present invention will be described in detail with reference to Examples below.

Figure 3 shows the cross-sectional structure T of an ink donor sheet for two-color recording.
i-represented. The ink donor sheet 3 consists of a first ink layer 3A for black recording and a second ink layer 3B for red recording on a capacitor paper (base paper) 3C having a thickness of 8 to 10 μm. They form friends on each side. Each ink layer is made by dispersing black or red pigments in thermal transferable wax, and the coating amount is 3.5 to 4-OVrnt Kan.
Ik is being done.

The melting point of the first ink layer 3A is set to 60°C, and the melting point of the second ink layer aBFi is set to 60°C or slightly higher than this K.

FIG. 4 shows the main part '1' of a recording apparatus using these three ink donor sheets. The recording apparatus is provided with a first ML recording A consisting of a thermal roller 4 and a pub crawler 5, and a second recording sB consisting of a blur roller 6 and a heat roller 7. The ink donor sheet 3 is drawn out from a supply roll (not shown), passed around the first recording section At4 with 11 g of ink Jm 3 A directed toward the t-back roller 5, and then wound onto the take-up roll 8. It looks like this. A set of closed-loop capacitor paper 9 is circulated between the first ml recording section A and the second recording section B while keeping contact mt with the thermal roller 4 or the heat roller 7.

When a recording operation is started in this recording apparatus, a first recording unit AK recording paper (cross-over paper) 11 is supplied from a supply tray (not shown). The recording paper 11 is the first ink donor sheet.
The back roller 5 passes between the thermal head 4 and the puff crawler 50 while in contact with the ink layer 3A of the thermal head 4.
, and convey them integrally in the -scanning direction (direction toward the second recording section B). The thermal radar 4 is driven in this conveyance state.

The thermal head 4 generates heat at a relatively low temperature in the area marked in red, and generates heat at a relatively high temperature in the area marked in black. 9J change of these heat generation 1 will cause the discharge quality applied to the thermal head 4,
Drive pulse 111! This is done by implementing IT. When relatively low temperature heat generation is performed, the second ink I-
Only the ink layer 3B becomes fluidized or sublimated, and the ink in that region is transferred to the capacitor It9.Also, if a relatively low temperature heat is generated, the ink layer 3A of i@l is also fluidized or sublimated at the same time. Becomes a sublimated state. This and 'f! ml of ink in that part of the ink layer 3A is on the recording paper 11
．． The ink of the same portion of the second ink layer 3B is transferred to the capacitor paper 9. Note that the ink of the second ink layer 3B is transferred between condensed V paper; 3C190 made of the same material. Such a transfer can be performed in a flat, flat sheet by adjusting the contact pressure of both capacitor papers 3C19 and the angle at the time of peeling according to tA as appropriate.

The content that has passed through the first recording section A is stored on paper 9 and recording paper 11.
reaches the second recording section BK after the same transport time has elapsed. In the second recording section B, the pressure roller 6 is moved to the heat roller 7 while the capacitor paper 9 and the recording paper 111 are overlapped.
The ink is then transferred onto the capacitor paper 9, and the ink is then uniformly heated to re-transfer the ink onto the recording paper 11. As a result,
In the black recording area, black and red ink are directly placed on the recording paper 11, and visually black recording is performed. In the area where red recording is performed, only red ink is transferred to the recording paper 11, and red recording is performed. The recording paper on which two-color recording has been performed in this manner is discharged to a paper discharge tray (not shown).

Figure 5 shows the cross-sectional structure of an ink donor sheet for simultaneous recording.
-It's an expression of friendship. Ink donor layer 12 includes first and second ink layers 12A, both of which record in black;
12B'i and capacitor paper (base paper) 12c. The melting point of the ink in the first ink layer 12A is 55 to 60°C, and the melting point of the ink in the second ink layer 12B is 55 to 60°C.
It is set at 60-70°C. capacitor m
The thickness of the ink layer 12c and the amount of ink applied in each ink layer 12A, 12B are the same as in the case of the ink donor sheet described above.

! ＠Figure 6 shows this ink donor system) The printing device used in 12.
A first recording section A and a second 6-pin portion B having the same configuration as the previous recording device are provided. 1st 16th record section A and 2nd
Similarly, a loop-shaped capacitor paper 9 is arranged in a trap in the recording section B.

When a recording operation is started with this recording device, M (not shown)
The first recording unit A [recording paper 13 is supplied from the supply tray 1]. The recording paper 13 is the first ink donor sheet.
The thermal head 4 is in contact with the ink layer 12A of
At this time, the pub crawler 5 presses the ink donor sheet 12' and the recording paper 13+t onto the thermal head 4, which are electrically connected on both sides of the ink donor paper 12' and the printing paper 13+t, and moves them in one scanning direction. (the direction of the second d recording section B).

The thermal head 4 is driven in this conveyance state.

When the heating element of the thermal head 4 selectively generates heat, the ink in the ml and gN2 ink layers at that location is fluidized and sublimated, and transferred to the recording paper 13 and the capacitor paper 9. The reason why the melting point of the ink in the ink layer 12B of the first ink layer 12B near the thermal head 4 is higher than that of the first ink + d12A is because it is heated at a higher temperature than the ink layer 12A of Ml, and the ink does not bleed or collapse in a steady state. This is to prevent this from happening.

After a predetermined delay time has elapsed after recording is started in the first recording unit A, the recording material 14 is supplied from the second supply tray (not shown) to the second recording unit B. This delay time is ,
It is set equal to the transport time of the capacitor paper 9 from the first recording section A to the ty2 edge Bll of II2. Second
In the recording section B, the pressure roller 6 presses the content against the heat roller rough in a state where the paper 9 and the recording paper 14t are piled up next to each other, and the ink transferred to the content 9 is uniformly VC.
) Heat it up and retransfer it to ML Recording Game 14. As a result,
The same ink pattern as the ink image transferred to the recording paper 13 in the first recording section A is also created on the recording paper 14. 02 sheets of recording paper 13.14 do not have any markings after the completion of the transcription period. Paper is output to the same output tray.

This recording device can record two records at the same time, such as when creating a slip.
It is mainly used when creating an iIt-, but it is also possible to record only one sheet. In this case,
There are two methods: one is to reduce the heat generation amount t of the thermal head 40 and transfer ink only to the capacitor paper 9, and the other is to transfer unnecessary ink to the back roller 5 or pressure roller rough when no recording paper is supplied. In the method, Tsukutsu crawler 5To or pressure roller 7
Vc ink adheres. However, since these inks are not heated again to the temperature f which makes the total transfer capacity 6f, there is no possibility that they will be re-transferred to the recording paper 13 or 14.As explained above, the ink donor sheet of the present invention Since solid ink that fluidizes or sublimates when heated is applied to both sides of the base paper, the base paper will not absorb moisture even if left in a high temperature, high humidity environment for a long time. Therefore, it is possible to completely prevent the occurrence of wrinkles on the ink donor sheet due to moisture absorption.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of a conventionally used specific heat recording medium. @ Figure 3 is a cross-sectional view of the ink donor sheet in the first embodiment of the present invention, and Figure 4 is a hard St-illustrating configuration diagram of a recording device for two-color recording using this ink donor sheet.
FIG. 5 is a sectional view of an ink donor sheet in a second embodiment of the present invention, and FIG. 6 is a diagram showing a configuration of a recording apparatus S for simultaneous recording using the ink donor sheet in this second embodiment. It is a diagram. 3.12... Ink donor sheet 3A, 12A
...First ink layer 3B, 12B...
Second Ink Layer Release Person: Fuji Xerox Co., Ltd. Representative Patent Attorney Ume Yu Yamauchi 2 Figure 3 @: 1.. Figure 0 ゛ ・.

Claims (1)

[Claims] An ink donor sheet characterized by having a layer of ink which is solid at room temperature and which sublimes when heated, formed on both sides of a base paper supporting the ink layer.