JPS63145078A - Method and device for thermal copying - Google Patents

Abstract

PURPOSE:To thermally copy an image portion of a normal image onto a common thermal recording paper, and to prevent thermal transfer of the image portion of a copy to a light transmitting portion while to prevent fading of the image portion of the copy, by driving a light source and thermally copying the image portion of the normal image corresponding to the image portion formed on the copy onto a thermal layer of the thermal recording paper. CONSTITUTION:A thermal recording paper 9 is arranged on a base 12 with a thermal layer 11 directed upward, then a copy 2 is set thereon with an image portion 3 directed upward, thereon a light transmitting material 8 is overlapped. Then a lamp house 4 is held so as to press a glass plate 6 being set on the rear face thereof against the base 12 while aligning with a copy area on the light transmitting material 8. A pressure sensitive mechanism functions to drive a lighting circuit for a lamp 5 so as to transmit flash light from the lamp 5. The light passes through the glass board 6 and the light transmitting material 8 and applied on a document 2. An image portion 3 described on the document 2 is heated to higher temperature than other portions by thermal energy produced through irradiation of light thus causing coloring reaction in an area of a thermal layer 11 of the thermal recording paper 9. Consequently, an image portion 3a of a normal image is thermally copied onto the thermal recording paper 9 in the same orientation as the image portion 3.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a thermal copying method and apparatus.

[Prior Art and Problems] Conventionally, in a copying machine that uses heat, a light source housing case with a light source inside is attached to a movable plate attached to a presser base on which a document is placed. There is a known plate-making/printing device that is attached to a removable M (e) and a heat-sensitive stencil sheet is attached to the open end of the light source housing case (for example,
According to this type of plate-making and printing device, the manuscript! By pressing the movable plate against the 21-sided base, the RT manuscript and the heat-sensitive stencil sheet are closely overlapped, and in this state, a light source is irradiated to generate heat in the image area drawn on the manuscript. By using this heat to make holes in the heat-sensitive stencil sheet, the plate making of the heat-sensitive stencil sheet is completed. Thereafter, ink is applied to the heat-sensitive stencil sheet, and stencil printing is performed on the recording paper cut out on the base.

Therefore, with the above-mentioned conventional apparatus, a plate making process and a printing process are required to obtain a copy of the jX manuscript, which is time consuming and troublesome. In particular, the printing process uses wet ink, which is difficult to handle.

Therefore, the present applicant has recently proposed a thermal copying method and apparatus that can make copies of AM in a simplified process (Japanese Patent Application No. 61-241736, Japanese Patent Application No. 61-241735). According to this proposal, a space illuminated by light from a light source placed inside the lamp house,
In other words, at the bottom position of the glass plate provided below the light source,
By placing an original and a transparent IJI or semi-transparent thermal recording paper with a heat-sensitive layer on one side and overlapping the two, by driving a light source, the image area drawn on the original absorbs light/8. Heat energy is generated by the conversion, and this thermal energy causes a color reaction to occur in the corresponding hit and heat layer areas of the thermosensitive recording paper. Therefore, there is an advantage that copies can be made with a very simple operation.

However, according to the above-mentioned thermal copying method of the present applicant, since a mirror image of the image area of the original is thermally copied onto the heat-sensitive layer, the image area of the mirror image is transferred to the thermal layer. Unless you look through it from the direction opposite to the layered surface of the paper, it is impossible to visually recognize the normal image area in the same direction as the image area drawn on the original. However, a transparent or translucent sheet must be used, which has the problem of lack of versatility.

In order to solve this problem, a method is proposed in which the original and thermal recording paper are placed in a positional relationship such that the image area formed on the original and the heat-sensitive layer formed on the thermal recording paper do not come into contact with each other. So that the heat-sensitive layer is facing upwards,
A method has been considered in which thermal recording paper is placed and an original is placed on top of the thermal recording paper so that one image portion faces upward. However, under this arrangement, if thermal copying is performed while pressing the bottom surface of the glass plate attached to the open end of the lamp house against the image area on the document,
There is a problem in that a part of the applied ink forming the image area melts due to the thermal energy generated during thermal copying, and a part of the ink is thermally transferred to the glass plate, staining its surface. If thermal copying is repeated several times, a portion of the applied ink forming the image area will be thermally transferred to the glass surface side little by little, and as a result, the image area will fade and become clear. There is a problem that it becomes difficult to perform thermal copying.

[Purpose of the Invention] This invention has been made in view of these problems, and is intended to print on sweat-permeable thermal recording paper other than transparent or translucent thermal recording paper in the same direction as the image area drawn on the original. It is possible to thermally copy the image part of the original image, and also to prevent the image part of the original from being thermally transferred to the transparent part provided on the light source housing case side, and even if thermal copying is repeated, the image part of the original can be thermally copied. It is an object of the present invention to provide a thermal copying method that can prevent color fading, and a thermal copying apparatus useful for use in the method.

[Key points of the invention] This invention aims to achieve these objectives.

Between the light source and the document with an image formed on its surface.

A light source is driven to correspond to the image area formed on the original by placing a light-transmitting body and thermal recording paper with a heat-sensitive layer formed on the surface on the back side of the original. The key point is to thermally copy the image portion of the normal image to be thermally copied onto the thermal layer of thermal recording paper.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 to 6 are diagrams showing each step of thermal copying according to this embodiment.

<Configuration of Embodiment> For convenience of explanation, the structure of a thermal copying apparatus used in this embodiment will first be described with reference to FIG.

That is, the thermal copying apparatus l uses light irradiation to transfer a normal image area of the original 2 in the same direction as the image area 3 onto the thermal recording paper 9 (
Thermal copying is carried out on eight layers 11 corresponding to (to be described later), and it has a small and portable appearance. This thermal copying apparatus l consists of a lamp house 4 having a hollow interior, a lamp 5 which is a light source that is driven during copying, a glass plate 6 which also serves as a pressing part and which is attached to the lower surface of this lamp house 4, and a lamp house 4 which is a hollow lamp house. It is composed of a reflective plate 7 made of aluminum foil or the like provided on the inner wall of the house 4.

On the other hand, as shown in the figure, one transparent body 8 used in this embodiment
are various resin films such as polyethylene terephthalate film, vinyl chloride film, polypropylene film, silicone rubber, urethane rubber film, etc.
In addition, in order to sufficiently transmit the light (infrared rays) from the lamp 5, it is made of a transparent, translucent material, or a thin material. It is formed. As shown in FIG. 4, the heat-sensitive recording paper 9 used in this embodiment includes various non-transparent and non-transparent supports 10 such as plain paper, a resin sheet material 1, synthetic paper, and a metal flexible plate. A heat-sensitive layer 11 is applied thereon. this! +! The 8th layer 11 is preferably made of a material that causes a coloring reaction at a relatively low temperature (for example, 70° C.).This heat-sensitive layer 11 is made of a color former, WJ colorant, #! ! 9 Color formers consisting of sensitizers and other additives (whitening agents, etc.) include leuco dyes, especially triphenylmetal-based and 2-fluorane-based lactone compounds, and fluoran compounds (representative compounds include: 2-(2-chloroanilino)-6
-D-n-propylaminofluorane, 2-(2-chloroanilino)-6-D-n-butylamino/fluoran,
2-(2-fluorophenylamino/)-6-dinithylaminofluoran, 2-(2-fluorophenylamino)-6-d-n-butylaminofluoran, etc.) are preferred as the color developer. Acid clay, activated clay, clay minerals such as attapulgite kaolin, phenol derivatives, phenol resins, aromatic carboxylic acids or polyvalent total flex salts thereof, etc. are preferred.As the sensitizer, 1) lowering the melting point related to color development, A material having a low 87P value and easily melting is suitable. For example, an amide type material can be used.

The heat-sensitive recording paper 9 is produced by uniformly dispersing the color forming agent and the color developer separately in a dispersion medium in which a binder is dissolved in a dispersion medium until the particle size becomes several microns, and then mixing the two. If necessary, additives such as pigments and wax are added, and the coating is coated on the support IO and then dried.

The thermal recording paper 9 having the above-mentioned structure is used as a recording paper for photocopying, and by overlaying the thermal recording paper on the El draft and irradiating it with light, a copy of the original can be made on the thermal recording paper. can be taken.

<Thermal Copying Process of the Example> Next, the procedure of the thermal copying process of the present example will be described.

As a first step, as shown in FIG. 1, thermal recording paper 9 is placed on base 12 with M layer 11 facing upward, and original 2 is set on top of it with image area 3 facing upward. Further, a transparent body 8 is superimposed thereon.

Next, grasp the lamp house 4, align the glass plate 6 on the lower surface of it with a predetermined copying area on the transparent body 8, and press it against the base 12 (FIG. 2) with a predetermined force. When pressed, the pressure-sensitive mechanism 5 (not shown) is activated, which drives the lighting circuit of the lamp 5, and a flash of light is emitted from the lamp 5 (Fig. 3). The light is transmitted and irradiated onto the original 2. Then, due to the thermal energy generated with this light irradiation, the image area 3 drawn on gC1g42 generates heat to a temperature that is sufficiently higher than other areas, and therefore, as shown in FIG. A coloring reaction occurs in a predetermined area of the heat-sensitive layer 11 of the heat-sensitive recording paper 9. Therefore, as shown in FIG. 6, a normal image portion 3a of the original 2 is thermally copied onto the thermal recording paper 9 in the same direction as the image portion 3 of the document 2.

In this way, according to this embodiment, the image area 3a is a normal image in the same direction as the image area 3 formed on the original document 2.
can be thermally copied onto thermal recording paper 9. Therefore, the heat-sensitive recording paper 9 is not limited to transparent or translucent materials coated with a heat-sensitive layer;
For example, non-transparent thermal recording paper commonly used in facsimile machines can be used, making it highly versatile and extremely convenient since there is no restriction to view the mirror image area from the opposite side. It is.

Furthermore, according to this embodiment, since the transparent body 8 is disposed between the glass plate 6 attached to the lamp house 4 side and the document 2, when thermal copying is performed, as thermal energy is generated, Even if a part of the applied ink forming the image area 3 on the original 2 melts, the melted applied ink will be transferred to the transparent body 8.
The ink only adheres to the bottom surface of the glass plate 6, and does not adhere to the bottom surface of the glass plate 6. Therefore, it is possible not only to prevent the bottom surface of the glass plate 6 from being stained with the applied ink, but also to improve the quality of copying. Even if I recreate it.

The image area 3 of the original 2 does not become gradually thinner.

Therefore, it is possible to prevent the color from fading.

Next, FIG. 7 is a sectional view showing another embodiment of the present invention.

In the case of the embodiment described above (FIGS. 1 to 6), in the space between the glass plate 6 attached to the lamp house 4 side and the document 2,
In this embodiment, a transparent material 8A made of a fluorine-based or silicon-based transparent mold release agent is coated or vapor-deposited on the lower surface of the glass plate 6. are doing.

Even with this configuration, I! In addition to being able to prevent a part of the image area 3 of the X draft 2 from being thermally transferred to the glass plate 6 side, since the transparent body 8A is formed of a mold release agent, After thermal copying, the transparent body 8A can be easily peeled off from the glass plate 6 to prepare for the next copy.

Variant example In addition, in the said Example, as shown in FIG.

The original 2 is placed with the image area 3 facing upward, while the thermal layer 1
The thermal recording paper 9 is placed with the original 2 facing upward, and thermal copying is performed by irradiating light from the lamp 5 placed at the upper position. However, the arrangement relationship between the original 2 and the thermal recording paper 9 is limited to this example. First, if the arrangement is such that the image area formed on the document can be thermally copied onto the heat-sensitive layer of the thermal recording paper so that the image area is in the normal position.

Various other arrangement relationships are possible.

Further, in the embodiment shown in FIG. 7 described above, the lower surface of the glass plate 6 is coated with a transparent material 8A, but the present invention is not limited to this. For example, a fluorine-based or silicon-based A similar effect can be obtained by coating with a mold release agent.

[Effects of the Invention] As is clear from the above description, the present invention drives a light source to heat-sensitively transfer a normal image area corresponding to an image area formed on a document onto a heat-sensitive layer of a heat-sensitive recording paper. Unlike conventional methods, the mirror image area of the copying method is reversed to create a normal image area in order to see through the back side of the transparent or semi-transparent thermal recording paper. There is no need for visual recognition, and thermal recording paper commonly used in facsimile machines can be used, so excellent effects such as high versatility can be obtained.

Further, according to the present invention, since the light-transmitting body is provided between the light-transmitting part provided on the light source housing case side and the rX document, thermal transfer of the image area of the original to the light-transmitting part can be prevented. In addition, even if thermal copying is repeated, it is possible to prevent the image area of the document from becoming thinner and discoloring.

[Brief explanation of the drawing]

Figures 1 to 6 show an example of the copying process of the present invention. Figure 1 is a sectional view showing the arrangement relationship of the lamp house, the transparent body, the original, etc., and Figure 2 is the original and the transparent body. 3 is a sectional view showing the process of thermal transfer by light irradiation under pressure, FIG. 4 is a sectional view showing the structure of thermal recording paper, and FIG. 5 is a sectional view showing the structure of the thermal recording paper. FIG. 6 is a cross-sectional view showing the process of thermal copying by irradiating light under pressure contact with thermal recording paper, and FIG. 6 is a perspective view of a main part of the thermal recording paper after thermal copying. FIG. 7 is a sectional view showing another embodiment of the invention. l... feeling 8: gi copying device, 2... manuscript, 3, 3a... image section, 4... lamp house, 5... ...Lamp, 6...Glass plate, 8.8A...Transparent body, 9...Thermosensitive recording paper, 10...Support, 11. ...Heat-sensitive layer. Figure 3 Figure 4 ■ Figure 6': Figure 57

Claims (3)

[Claims] (1) A highly translucent material such as a transparent material, a translucent material, or a thin material is placed between the light source and the original document on which an image area such as characters or figures is formed, and the original document placing a heat-sensitive recording paper with a heat-sensitive source formed on its surface on the back side of the document; and driving the light source while the document, the transparent body, and the heat-sensitive recording paper are pressed against each other and overlapped. The image area formed on the document is heated by thermal energy generated as a result of light irradiation from the light source through the transparent body, and the heat-sensitive layer area corresponding to the image area is heated. A method for thermal copying, comprising the step of thermally copying a normal image area onto the heat-sensitive layer by changing the color. (2) A thermal copying apparatus characterized in that a transparent body with high transparency is provided in a transparent part that also serves as a pressing part provided at the open end of a light source housing case that has a light source inside. (3) The thermal copying apparatus according to claim 2, wherein the light-transmitting body is coated on the surface of the light-transmitting portion.