JPS62109685A - Transfer sheet for thermal transfer copying machine - Google Patents

Abstract

PURPOSE:To eliminate a double exposure and a missed out portion in copying caused by leakage of exposure, by applying a scale for guiding on the surface of an intermediate transfer film of a plastic film being made to adhere to a hot-melt wax layer in an ink film. CONSTITUTION:A transfer sheet 7 for a thermal transfer copying machine consists of; a light-transmittable plastic film 71 serving as an intermediate transfer material and an ink film 74 which is made to adhere thereto and consists of a base 72 of similar material to the film 71 and a wavelength selectively transmittable and hot-melt wax layer 73 formed thereon and containing a dispersed coloring agent such as dye and pigment. As the plastic film, polyethylene, polyethylene terephthalate, polypropylene, or the like is used; as the wax, beeswax, candelilla wax, carnauba wax, or the like is used. The intermediate transfer material 71 of 10-200mum thick, desirably 40-60mum thick, is preferred.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer sheet used in a thermal transfer copying device.

Although electrophotographic copying machines such as the Carlson method are widely used, they are large, heavy, noisy, and expensive. It is not suitable for miniaturization, portability, low cost, etc. In addition, even if the material to be transferred is designated paper or general plain paper is possible, if it is sheet-like and has folds or missing parts, problems will occur mainly in paper transportation, and booklets such as notebooks and notebooks will It was not possible to obtain copies of the originals, and attempts were made to cut and paste them, but these had the disadvantages of being unsightly and becoming thicker.

(...) In addition, small-sized copying devices for plate making and printing using flash bulbs have been proposed, but in most cases the amount required to obtain copies is one or a few, and the cost of clothes, bulbs, etc. Including the cost of lamps, etc., the unit cost of copying becomes extremely expensive, which is not practical. Furthermore, many of these plate-making and printing machines have the disadvantage that, due to their structure, the original must be in the form of a sheet or a single-sided original.

(iii) Furthermore, in recent years, small digital copying machines that use a document reading reader and a recording printer have been proposed, but in order to maintain a high level of image quality, the pixels must be made extremely fine. It has become more expensive than ever.

Copying machines have traditionally been widely used as office machines, but they are all installed on the floor, on a desk, or on a special stand, and when you want to make copies, you have to put the copying machine on. I had to get to the place.

In view of the above-mentioned circumstances, the present applicant first proposed a device that can be easily carried around and stored in a bag or pocket. We have proposed a portable copying machine that is small, very inexpensive compared to conventional copying machines, and has high quality copied images.

FIG. 2 is a partially cutaway perspective view for explaining an example of a portable copying device previously proposed by the applicant. In the figure, 1 is a portable copying device, and the copying unit W1 is As in, the device
Electronic components on the board from both sides.

an electrical control section 2 incorporating an electric control section 2, an operating section 3 including display lamps and switches, a charging section 4 mainly consisting of a capacitor that stores the emitted energy of a flash lamp, a light emitting section 5 consisting of a flash lamp 51, a reflector 52, etc., and a manuscript. and a translucent platen plate 61 that brings the copy sheet into close contact with the copy sheet. Transparent platen portions 6 and the like made of transparent buffer members 62 and the like are arranged in a substantially laminated manner.

FIG. 3 is a side sectional view showing an example of a transfer sheet suitable for use in the portable copying device, and FIG. 4 is a partially exploded perspective view. In the figure, 7 is a transfer sheet; is a wavelength-selective transparent and heat-melting material in which coloring agents such as dyes and pigments are dispersed on a transparent plastic film 71 which is an intermediate transfer member, and a base 72 similar to the transparent plastic film 71. It consists of an ink film 74 provided with a wax layer 73 in close contact with it, and a frame 75 is used as necessary.

Examples of the plastic film include polyethylene, polyethylene terephthalate, polypropylene, polyvinyl chloride, polyvinylidene chloride, nylon, etc., and examples of the wax include beeswax.

Candelilla wax, Renaba wax, Montan wax, etc. can be used, as well as paraffins, low-molecular synthetic resins, etc. In addition, as for the film thickness, as an extreme example, a glass plate several times thick can be used for the intermediate transfer body, but it is difficult to use for practicality (operability).

10 to 200 μm and even 40 to 60 μm in terms of cost, etc.)
A plastic film of about μm size is used. Since the ink film base is used as a heat transfer layer during copying, a thin layer is preferable; if it becomes thick, not only high energy is required, but also the sharpness of the image deteriorates. Practically speaking, a thickness of 3 to 6 μm is used including the ink film manufacturing department. If the ink film wax layer is thin, it will not be possible to obtain a sufficient image, and if it is too thick, the transmittance will be poor, high energy will be required, and "bleeding" will occur easily.
2 to 6 μm is suitable. As a light source, a halogen lamp, a tungsten lamp, etc. can also be used. However, since the shorter the heating time of the wax layer, the sharpness of the image is maintained, flash exposure using a high-output xenon lamp for a short time (e.g., light emission time of 2 to 3 m5 ec or less) is desirable. If the heating time is too long, the heat will be transmitted to parts of the document that do not correspond to the printed lines, resulting in poor sharpness. However, halogen lamps, tungsten lamps, etc. have the advantage of simplifying the electrical system.

FIG. 5 is a diagram for explaining a copying method when information (image area 81) on a document 8 is copied using the copying device 1 and the transfer sheet 7. The copy sheets 7 are stacked on top of each other with the ink film side facing the original, and the copying apparatus 1 is placed on top of the copy sheets 7 with the platen portion 6 in close contact with the copy sheets 7. The copying apparatus 1 is connected to a commercial 100V power source or a charging battery, and the flash charging capacitor is charged to a preset potential level.

The platen, the copy sheet, and the original are uniformly pressed against the surface of the copy sheet by the weight of the device 1 and the pressure applied through the device 1. When the flash lamp trigger switch is turned on in this state, the flash lamp emits light and the original is exposed to light through the platen and the copy sheet. At this time, some of the light is also absorbed by the copy sheet, especially the ink film wax layer, and generates heat, which is used as a thermal bias. The image area 81 on the document generates heat due to light absorption, and this heat is transmitted to the wax layer through the base of the ink film and melts the wax. Melted wax is intermediate transfer body 7
When the device 1 is removed and both films 71 and 72 of the transfer sheet are peeled off, a wax image corresponding to the image area of the original is obtained on the medium-width transfer body 71. This image is a normal image when viewed from the intermediate transfer body side, and this film may be used as a copy image as it is, or may be pasted on a notebook or the like as necessary. The energy of light emission varies depending on the spectral characteristics of the platen, copy sheet, etc., and the light emission characteristics of the lamp, but it also varies depending on the type of original.For example, it is low in the case of line images using pigments such as carbon or long wavelength absorption colors. Energy is sufficient, but dye-based colorants and long-wavelength reflective colors require high energy6.Also, if more energy than necessary is applied, the edges of the image may melt, resulting in poor sharpness. Flow caused by the surface tension of the wax can cause hollow spots in the image. Therefore, the charging energy for light emission is, for example, 0,8~2
, 5 Joule/d. or,
Since the resulting image on the intermediate transfer member is heat-fusible, it can also be thermally transferred to notebooks, notebooks, fabrics, etc. using an iron or other heat source. There is no problem with transferring to paper, cloth, or materials that can be impregnated with molten wax, but when transferring to glass plates, plastic films, etc., if you apply heat and pressure with an iron, heated roller, etc., the molten wax will be transferred as an intermediate transfer. It leaks between the body and the transferred body and bleeds into the image. In such a case, flash exposure is still effective, and it is sufficient to stack the intermediate transfer members so that the ink image faces the transferred object, place the device 1 in the same manner as above, and emit light while applying pressure. However, in this case, heat generation due to light absorption of the wax layer itself is utilized, so the heating rate is, for example, 1.5% lower than in the above case.
~2 times as much energy is required.

In a copying machine that uses full exposure using a flash, the copy area is determined by the exposed area, so in order to copy a large area, prepare a copy sheet with a large area and change the position. By repeating exposure, it is possible to copy a large area, but since the area exposed each time is determined by the copying device, there is a risk of copying due to unnecessary double exposure or exposure leakage when repeating exposure. There is a drawback that omissions occur.

Purpose The present invention provides a method for copying a large area by changing the copying position and repeating exposure in the above-mentioned copying apparatus.
The purpose of this invention is to provide a transfer sheet 1 that can prevent unnecessary double exposure and missing copies due to exposure leakage that occur during repeated exposures.

! --In order to achieve the above object, the present invention provides an intermediate transfer film comprising an ink film having a heat-melting wax layer provided on a plastic film, and a plastic film closely attached to the heat-melting wax layer of the ink film. The transfer sheet is characterized by having a guide scale on the surface of the intermediate transfer film. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a plan view illustrating an embodiment of the transfer sheet according to the present invention, in which the transfer sheet 7 includes an intermediate transfer body 71 made of translucent plastic and a similar translucent material as described in connection with FIG. An ink film 74 having a heat-melting wax layer on a base made of a photosensitive plastic film.
The intermediate transfer member is configured to be in close contact with the surface of the wax layer.

Accordingly, in the present invention, a scale 76 is provided on the surface of the intermediate transfer film 7.1, and the illustrated example shows a case where the copy sheet has an area approximately four times the exposed area of the copying machine. There is. That is, the broken line 76 in the figure is a guide scale line indicating the exposure area of the copying device, and the exposure area 76 is set so that the viewing line is slightly narrower than the exposure area 77 indicated by the two-dot chain line. being drawn. Therefore, although the surrounding area is exposed twice, the waste is very small, and on the contrary, untransferred areas due to exposure leakage are prevented.

Note that the guide scale line 76 is inserted, for example, in the following manner.

(a) Scratch the surface of the intermediate transfer film with a sharp object to make a dent.

(b) Scratch and indent the surface of the intermediate transfer film while melting it with a heated sharp object.

(c) Press a convex heating element in the shape of a scale line to create a concave line or an uneven pattern on the surface.

(d) Applying a colorant pattern by printing or screen printing. The ink material used at this time is preferably a semi-transparent material that has little effect on image formation, for example, uses dyes or pigments such as yellow or magenta and is transparent to long wavelength components.

Wheat - As is clear from the above description, according to the present invention, when copying is performed by changing the copying position and repeating exposure on a large area transfer sheet, unnecessary double exposure and exposure leakage can be avoided. Missing copies can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a plan view for explaining an example of a transfer sheet according to the present invention, and FIG. 2 is a partially broken view for explaining an example of a portable copying device previously proposed by the applicant. Perspective view,
FIG. 3 is a side sectional view showing an example of a transfer sheet to which the present invention is applied, FIG. 4 is a partially exploded perspective view of a copy sheet, and FIG. 5 is a copy sheet in which the transfer sheet according to the present invention is used. FIG. 3 is a diagram for explaining how to use the device. DESCRIPTION OF SYMBOLS 1... Copying device, 2... Electrical control section, 3... Operating section, 4... Charging section, 5... Light emitting section, 6... Platen section, 7... Transfer sheet, 8...Manuscript, 71...
Intermediate transfer film, 74... Ink film, 76.
...Guide scale, 77...Copy area by one exposure.

Claims (1)

[Claims] In a transfer sheet constituted by an ink film having a heat-melting wax layer provided on a plastic film, and an intermediate transfer film made of a plastic film closely adhered to the heat-melting wax layer of the ink film, the intermediate transfer film 1. A transfer sheet for a thermal transfer copying device, characterized in that it has a guide scale on its surface.