JPH06305238A - Recording method - Google Patents

Abstract

PURPOSE:To provide a recording method capable of obtaining a high quality image even though a heating means which is low in density of a thermal element is used. CONSTITUTION:A recording material having a surface of which a retreat contact angle is lowered when it is brought into contact with liquid under a heated state, is provided. A latent image is formed by a method forming the retreat contact angle corresponding to heating temperature in a heated part by heating selectively by a heating means under a state wherein a contact material consisting of liquid, or steam, or solid becoming liquid by heating is brought into contact with a surface of the recording material. A visual image is formed by developing by bringing recording agent containing a color material into contact with the latent image. In a recording method having a means wherein the image is recorded by transferring the visual image to recording paper, a size of one dot (4) forming a character and a symbol (3) is varied by the dot to carry out printing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method applied to a recording device such as a printer and a printing machine, and particularly to a recording having a surface which has a receding contact angle which is lowered when heated and brought into contact with a liquid. The present invention relates to a recording method using the body.

[0002]

2. Description of the Related Art The applicant of the present invention has previously proposed that the surface of a recording material having a surface whose receding contact angle decreases when it is heated and brought into contact with a liquid, liquid, vapor, and receding contact in the recording material. Depending on the image information signal, the size and / or the temperature of the heating area on the surface of the recording medium may change depending on the image information signal in the state of being in contact with a contact material selected from liquid or solid that generates liquid or vapor at a temperature lower than the angle lowering start temperature. Contacting with the contact material by heating so as to change or by heating the surface of the recording body so that the size and / or temperature of the heating region on the surface of the recording body changes according to the image information signal. Recording method for forming a region (a desired pattern region, which is referred to as a latent image or a latent image region) having a receding contact angle according to the size and / or temperature of the heating region on the surface of the recording medium, and the heating state In addition, the surface of the recording material having a surface whose receding contact angle decreases when brought into contact with a liquid and the recording material solution or dispersion liquid containing the color developing material in contact with the surface of the recording material according to the image information signal. By heating so that the size and / or temperature of the heating area of the recording medium changes, or the size and / or temperature of the heating area of the recording medium changes according to the image information signal. A recording method was proposed in which a visible image according to the size and / or temperature of the heated area is formed on the surface of the recording medium by contacting it with a recording material solution or dispersion containing a color developing material while being heated to ( See Japanese Patent Laid-Open No. 4-226385).

That is, the invention described in the above publication uses as a recording body a member having a surface which has a receding contact angle which becomes low (increases liquid adhesion) when heated and brought into contact with a liquid. The present invention provides a recording method capable of selectively or selectively and reversibly forming a desired pattern area (latent image area) on the surface of a recording medium, and further containing a developer in the pattern area. If a recording material (for example, liquid ink) is supplied, a good visible image can be obtained from the beginning, and this visible image can be fixed on the surface of the recording medium as it is, or the visible image can be transferred to recording paper without fixing. It is intended to provide a recording method which is fixed so that a clear image having gradation can be obtained. Further, according to the above invention, it is possible to reversibly print a plurality of reversible patterns by using a recording medium having excellent storage stability and stability in all steps such as formation / erasure of a desired pattern area (latent image), visualization, and transfer. A recording method is provided by which the above steps of times can be performed.

As described in detail in the above-mentioned publication, the recording medium has a low receding contact angle when heated and brought into contact with a contact material such as liquid or vapor (liquid adhesion is high. However, when the recording material surface is heated in the absence of the contact material, it does not interact with the contact material and returns to the original receding contact angle to erase the latent image. (Image removal). Therefore, by providing a means for heating in the state of contact with the contact material and a means for heating in the absence of the contact material, it is possible to form a recording device that can easily perform recording and erasing.

[0005]

By the way, in the recording apparatus using the above-mentioned recording method, a thermal head or the like is used as a means for heating the surface of the recording body in pixel (dot) units in accordance with the image information signal. Here, the method of printing characters and symbols by the thermal head is shown in FIGS. FIG. 7 shows a printing example using a thermal head having a low thermal element density, and FIG. 8 shows a printing example using a thermal head having a high thermal element density. Printing interval of 2 is a thermal element interval of the thermal head, 3 is a symbol of a print target, 4 is an elliptical area, and is a 1-dot latent image or developing area formed by one thermal element of the thermal head. The part indicated by hatching is a region deviated from the print target. Conventionally, since the dot shape by each thermal element of the thermal head is uniform, when a thermal head with a low thermal element density is used in order to reduce the cost of the device, as shown in FIG. However, the resulting outline is of low quality without smoothness. Further, when a thermal head having a high thermal element density is used, since the size of the dots 4 is smaller and the density is higher than that of the symbol 3, almost the desired shape result is obtained as shown in FIG. Although it is smoother than in FIG. 7, it cannot be said that the outline is sufficient because the dot shape is uniform, and there is a problem that the cost of the apparatus becomes high. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a recording method in which a high-quality image can be obtained at low cost by using a low-density thermal head in the above-described recording method. .

[0006]

In order to achieve the above-mentioned object, the invention of claim 1 comprises a recording medium having a surface whose receding contact angle is reduced when heated and brought into contact with a liquid. A latent image is formed on the heating part by a method of selectively heating a contact material composed of a liquid or vapor or a solid that becomes a liquid by heating on the surface of the body to form a receding contact angle according to the heating temperature. In a recording method having a means for forming a visible image by bringing a latent image into contact with a recording material containing a coloring material and developing the image, and transferring the visible image to a recording paper to record the image, And forming a symbol 1
The feature is that printing is performed by changing the dot size in dot units.

According to a second aspect of the present invention, there is provided a recording medium having a surface whose receding contact angle is reduced when the recording medium is heated and brought into contact with a liquid, and the surface of the recording medium becomes liquid or vapor or becomes liquid by heating. A latent image is formed on the heating portion by a method of selectively heating a contact material made of a solid in a contact state to form a receding contact angle according to the heating temperature, and a recording material containing a coloring material is added to the latent image. In the recording method, a visible image is formed by contacting and developing, and then the visible image is transferred to a recording paper, and then a character and a symbol are formed in a recording method having means for erasing (eliminating) the latent image by heating. The feature is that printing is performed by changing the size of one dot in dot units.

According to a third aspect of the present invention, in the recording method according to the first and second aspects, the shape of one dot formed is longer in the main scanning direction than in the sub scanning direction. The invention according to claim 4 is characterized in that, in the recording method according to any one of claims 1 to 3, a recording material is used as a contact material, and latent image formation and development are simultaneously performed.

[0009]

According to the recording method of the present invention, the surface of a recording medium having a surface whose receding contact angle decreases when heated and brought into contact with a liquid, liquid, vapor, and receding contact angle in the recording medium. The size and / or temperature of the heating area on the surface of the recording material changes according to the image information signal in the state where it becomes liquid at a temperature lower than the lowering start temperature or contacts with a contact material selected from liquid or solid that generates vapor. Or by contacting the surface of the recording material with the contact material while heating so that the size and / or the temperature of the heating area of the recording material changes according to the image information signal. A region (a desired pattern region, referred to as a latent image or latent image region) having a receding contact angle according to the size and / or temperature of the heating region is formed on the surface of the recording medium. In Do recording method, in the present invention,
Since printing is performed by changing the size of one dot forming characters and symbols in dot units, a thermal head having a low thermal element density is used as a selective heating means for heating the surface of a recording medium in accordance with an image information signal. Also, it is possible to obtain a high quality printing result as if using a thermal head having a high thermal element density.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the configuration of a recording apparatus to which the present invention is applied. In FIG. 1, reference numeral 21 is a selective heating means having a head portion in which a large number of thermal elements are arranged in a direction perpendicular to the paper surface. As a thermal head, 22 is a belt-shaped recording material, 23 is a latent image forming liquid holding body that holds a latent image forming liquid as a contact material and makes contact with the recording material, and 24 is a recording agent containing a coloring material (hereinafter, A sponge for holding (hereinafter referred to as ink), 25 is a transfer roller, 26 is recording paper, 27 is a cleaner for cleaning, 28 is a heater for image removal, 2
Reference numeral 9 is a recording medium feed roller, and 32 is a control device for controlling power supply to the thermal elements of the thermal head 21 in accordance with the image information signal. In this recording apparatus, the latent image forming liquid is held in contact with the surface of the recording body 22 by the latent image forming liquid holder 23, and the thermal head 21 selectively heats the latent image forming liquid according to the image information signal, and makes a backward contact with the heating portion. A latent image is formed by a method of forming a corner, the latent image is developed with the ink of the developing sponge 24 to form a visible image on the surface of the recording medium 22, and the visible image is transferred to the surface of the recording medium. The roller 25 presses the recording paper 26 under pressure to transfer a visible image onto the recording paper 26 for recording. After the transfer, the surface of the recording body 22 is cleaned with a cleaner 27, and then the image removing heater 28 is used.
The latent image is erased (deimaged) by being heated by.

FIG. 2 is a diagram showing another configuration example of the recording apparatus. The recording body 22 is formed in a drum shape, the liquid ink 30 is used as the latent image forming liquid, and the infrared lamp 31 is used for removing the image. It is an example. In the apparatus configuration of FIG. 2, since the liquid ink is used as the latent image forming liquid, latent image formation and development can be performed at the same time, and the configuration can be simplified. As the configuration of the recording apparatus to which the present invention is applied, various configurations other than those shown in FIGS. 1 and 2 can be applied.

Next, the recording method according to the present invention will be specifically described. (1) Method of printing characters and symbols (claims 1, 2, 4) FIG. 3 shows a printing example of the present invention. In FIG. 3, the horizontal lines at equal intervals indicated by reference numeral 1 are the print intervals in the sub-scanning direction (moving direction of the recording medium), the vertical lines indicated by 2 are the thermal element intervals of the thermal head, 3 is the symbol of the print target, and 4 ellipses. The shape area is a 1-dot latent image formed by one thermal element of the thermal head or the development area, and the hatched area 5 is an area deviated from the print target. In printing with the thermal head 21, the dot density in the sub-scanning direction can be controlled by changing the feed speed of the recording medium 22, but the dot density in the main scanning direction (arrangement direction of thermal elements) depends on the thermal element density of the thermal head 21 used. It cannot be physically changed. Therefore, in the present invention, by changing (controlling) the size of the dots 4 forming the characters and symbols in dot units as shown in FIG. 3, even if a thermal head having a low thermal element density is used, the thermal element density is high. This makes it possible to obtain a high-quality printing result as when using a thermal head. More specifically, as shown in FIG. 4, in the memory of the controller 32 that controls the thermal head 21, the characters and symbols of the font table created corresponding to ASCII code (ASCII code) or JIS code are stored. Data of the power supply amount to the thermal element is stored in advance corresponding to each dot of the dot matrix pattern to be formed.

Here, the ASCII code (ASCII) is shown in FIG.
An example of printing the code "1" of code 31h is shown. In FIG. 5, (a) shows the dot matrix pattern of the font that constitutes "1", and (b) shows "
An example of a font table created corresponding to 1 "is shown, and (c) is a dot size set in advance in several stages and one element of the thermal head corresponding to each dot size is supplied. 5 shows a relative table of the amount of supplied electric power, for example, to a thermal element that forms dots with addresses (1)-(iv) in the dot matrix pattern forming “1” in FIG. The power supply amount of 2 becomes 2 from the table of (b), and a dot having the size of the power supply amount 2 shown in (c) is formed. Similarly, the thermal element that forms the dots of (2)-(iii). The power supply to the table is 1 from the table in (b).
Therefore, a dot having the size of the power supply amount 1 shown in (c) is formed. As described above, according to the present invention, when printing is performed, from the font table corresponding to the characters and symbols to be printed, which are stored in the memory, the thermal correspondence corresponding to each dot of the dot matrix pattern forming the characters and symbols is performed. The control is performed in dot units (heat element units) by referring to the data of the power supplied to each heat element of the head. As a result, it becomes possible to perform printing controlled in dot units as shown in FIG.

Next, an example of a method of supplying electric power to the thermal head in the case of performing the control in dot units will be described below. Electric power corresponding to the supplied electric power data is simultaneously applied to each thermal element of the thermal head. Power is simultaneously supplied only to elements having the same power supply data. In this case, the time for printing one line depends on the number of types of power supply data existing on that line. However,
When the wiring of the electric power supplied to the thermal element of the thermal head is divided into blocks, the wiring may be performed in block units. All lines are printed by taking the time required to supply electric power for several types of predetermined supply electric power data. The above method is a method that can be used only in a thermal head that can supply power to each thermal element, and is suitable for a serial printer. The method of, is a method of using a thermal head in which power is supplied simultaneously to all elements or simultaneously in blocks, but it is simpler as a control method.

(2) Thermal Element Shape (Claim 3) The recording method of the present invention is mainly for supplementing the dot density in the main scanning direction when a thermal head having a low thermal element density is used. It is mainly assumed that the dot spacing in the main scanning direction is longer than the dot spacing in the sub-scanning direction.
In such a case, as shown in FIG. 6, if the dot shape is made longer in the sub-scanning direction than in the main-scanning direction, solid printing will occur.
A large amount of power needs to be supplied to connect dots in the main scanning direction, resulting in high power consumption. Therefore, as shown in FIG. 3, a thermal element shape having a dot shape in which the main scanning direction is longer than the sub scanning direction is suitable for this method, and by doing so, it is possible to suppress power consumption. As a result of actual printing using the printing method shown in (1) above and the thermal element shape shown in (2) above, it was possible to print with a smooth outline and high quality.

[0016]

As described above, in the recording method according to the first and second aspects, since the size of one dot of the dot matrix pattern forming characters and symbols is changed in dot units, printing is performed selectively. Even if a thermal head with a low thermal element density is used as the heating means, it is possible to obtain high-quality characters and symbols (especially user-registered characters) desired for printing, realizing a recording device that enables high-quality printing at low cost. it can.

In the recording method of the third aspect, since the shape of one dot to be formed is longer in the main scanning direction than in the sub scanning direction, a thermal head having a low thermal element density is used.
When this method is applied, recording can be performed with low power consumption as compared with the case where the shape of one dot formed is shorter in the main scanning direction than in the sub scanning direction.

Further, in the recording method of the fourth aspect, since the latent image formation and the development can be performed at the same time, the developing section can be omitted, the structure of the recording apparatus can be simplified, and the cost can be further reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a recording device to which the present invention is applied.

FIG. 2 is a diagram showing another configuration example of a recording apparatus to which the present invention is applied.

FIG. 3 is a diagram showing a printing example according to the recording method of the present invention.

FIG. 4 is an explanatory diagram of a recording method according to the present invention.

FIG. 5 is an explanatory diagram of a recording method according to the present invention.

FIG. 6 is a diagram showing an example of printing when the shape of one dot is shorter in the main scanning direction than in the sub scanning direction.

FIG. 7 is a diagram showing a printing example by a conventional recording method when a thermal head having a low thermal element density is used.

FIG. 8 is a diagram showing an example of printing by a conventional recording method when a thermal head having a high thermal element density is used.

[Explanation of Codes] 1: Printing Interval in Sub-scanning Direction 2: Thermal Element Interval of Thermal Head 3: Symbol of Print Target 4: 1-dot latent image or development area 5: Area deviated from print target 21: Thermal Head ( Latent image forming heat source) 22: recording medium 23: latent image forming liquid holding body 24: developing sponge 25: transfer roller 26: recording paper 27: cleaner 28: image removing heater 29: recording medium feeding roller 30: liquid ink 31: Deimager lamp 32: Thermal head controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinji Tanaka, 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (72) Hiromichi Komai, 1-3-6 Nakamagome, Ota-ku, Tokyo・ Inside Ricoh Co., Ltd.

Claims (4)

[Claims] 1. A contact material comprising a recording body having a surface whose receding contact angle decreases when it is heated and brought into contact with a liquid, and the surface of the recording body is made of a liquid or vapor or a solid material which becomes a liquid by heating. To form a receding contact angle according to the heating temperature by selectively heating in contact with the latent image is formed on the heating portion, the latent image is contacted with a recording material containing a coloring material to develop. By forming a visible image by this, and transferring the visible image to a recording paper to record an image, in a recording method, the size of one dot forming a character and a symbol is changed in dot units to perform printing. A recording method characterized by performing. 2. A contact material comprising a recording body having a surface whose receding contact angle decreases when heated and brought into contact with a liquid, the surface of the recording body being a liquid or vapor or a solid material which becomes a liquid by heating. To form a receding contact angle according to the heating temperature by selectively heating in contact with the latent image is formed on the heating portion, the latent image is contacted with a recording material containing a coloring material to develop. In this recording method, a visible image is formed by transferring the visible image to recording paper, and then the latent image is erased (deimaged) by heating. The printing method is characterized in that the printing is performed by changing the dot unit. 3. The recording method according to claim 1, wherein the shape of one dot to be formed is longer in the main scanning direction than in the sub scanning direction. 4. The recording method according to claim 1, wherein a recording material is used as a contact material, and latent image formation and development are simultaneously performed.