JP3090501B2 - Reversible thermosensitive recording method and reversible thermosensitive recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive recording method and a heat-sensitive recording apparatus capable of repeatedly forming and erasing an image using a reversible heat-sensitive recording material.

[0002]

2. Description of the Related Art In recent years, a reversible thermosensitive recording material which can form a temporary image and erase the image when it becomes unnecessary has been attracting attention. Typical examples thereof include a low glass transition temperature vinyl chloride-vinyl acetate copolymer having a glass transition temperature (Tg) of 50 to 60 ° C. to less than 80 ° C. on a support such as a polyester film. Reversible thermosensitive recording materials having a heat-sensitive layer in which a low-molecular organic substance such as a higher fatty acid is dispersed in a resin base material are known (JP-A-54-119377, JP-A-55-1).
No. 54198).

[0003] Recording with this type of recording material, that is, image formation and erasing, utilizes a change in transparency due to the temperature of the heat-sensitive layer. The means for forming and erasing the image on the reversible thermosensitive recording material may be any method that can heat the reversible thermosensitive recording material to an appropriate temperature at which the reversible thermosensitive recording material undergoes a reversible change. There is a lamp. Among them, the thermal head is the most general image forming means, as in the case of the conventional irreversible thermosensitive recording material, and can be used for erasing.

The temperature at which the reversible thermosensitive recording material undergoes a reversible change is required to be at least about 60 ° C., preferably at least 80 ° C. in view of environmental resistance. When the recording material of the reversible thermosensitive recording material is heated from room temperature to a reversible change temperature of 60 ° C. or more at a stretch from a room temperature, the temperature in a region close to the thermal head rises more than necessary due to a large thermal gradient. Deterioration easily occurs in the region (FIG. 1). In order to reduce the thermal gradient, it is effective to increase the heating time. Actually, a heat roller or a hot plate having a longer heating time than a thermal head causes extremely little deterioration of a recording medium. However, if the heating time is lengthened, the heat spreads isotropically, so that the resolution of the image is reduced and a clear image cannot be obtained.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a reversible thermosensitive thermosensitive device which has a small thermal gradient in forming and erasing an image, has excellent image resolution, and has a small decrease in image density even when image forming and erasing are repeated. It is an object to provide a recording method and a reversible thermosensitive recording device.

According to the present invention, the following inventions are provided. A first invention is to form and / or erase an image on a recording medium using a reversible thermosensitive recording material , and
In the recording method where the heating temperature for formation and disappearance is different ,
The same heating equipment for image disappearance and preheating before image formation
Reversible thermosensitive recording method, which comprises carrying out simultaneously by. A second invention is the reversible thermosensitive recording method as described above, wherein the recording medium is a card.

According to a third aspect of the present invention, there is provided a recording apparatus used for performing the reversible thermosensitive recording method according to any of the above aspects, wherein an image is formed on a recording medium using the reversible thermosensitive recording material. Heating equipment, image erasing and preheating before image formation
Heating equipment for simultaneous image erasure and preheating for simultaneous heating
And a reversible thermosensitive recording device. According to a fourth aspect of the present invention, the reversible heating apparatus according to the above aspect, wherein the heating facility for simultaneously erasing and preheating the image is at least one selected from a constant temperature heat source, a heating fluid, an electromagnetic wave irradiation facility, a sound wave irradiation facility, and a thermal head. Thermosensitive recording device. The fifth invention is characterized in that the heating element is provided with two or more rows, and a thermal head is used in which at least one of the heating elements is used for image erasing and preheating. Reversible thermosensitive recording device.

[0008] In the preheating equipment provided in the thermal recording apparatus of the present invention, the preheating method is as follows: (1) The recording medium is brought into contact with a constant temperature heat source such as a heat roller or a hot plate. -Irradiate the recording medium with electromagnetic waves or sound waves such as light or microwaves.・ The fluid such as air or water is heated to hit the recording medium.・ The recording medium is brought into contact with the thermal head in the same manner as writing to the recording medium. Can be mentioned. Furthermore, as one of the preheating methods for bringing the recording medium into contact with the thermal head, a method in which the thermal head includes two or more rows of heating elements, of which one or more heating elements are used for preheating. be able to.

Hereinafter, the present invention will be described in more detail. The reversible thermosensitive recording material used in the present invention is a reversible thermosensitive recording material capable of forming and erasing an image reversibly by heat. The present invention can be applied to all reversible thermosensitive recording materials except materials that require rapid heating for reversible change.

The reversible thermosensitive recording material used in the present invention utilizes the change in transparency (transparent state, cloudy opaque state) as described above. The difference between this transparent state and cloudy opaque state is estimated as follows. Is done. That is, (i) in the case of transparency, the particles of the organic low-molecular substance dispersed in the resin base material are composed of large particles of the organic low-molecular substance, and the light incident from one side is not scattered and is opposite. (Ii) In the case of cloudiness, the particles of the organic low-molecular substance are composed of polycrystals composed of fine crystals of the organic low-molecular substance, and the crystal axes of the individual crystals Is oriented in various directions, so that light incident from one side is refracted many times at the interface between the crystals of the organic low-molecular substance particles, and is scattered, so that it appears white.

In FIG. 1 (which shows the change in transparency due to heat), a heat-sensitive layer mainly composed of a resin base material and an organic low-molecular substance dispersed in the resin base material is, for example, T
At a room temperature of 0 or less, it is cloudy and opaque. This is called temperature T2
When heated to room temperature below T0 again, the film remains transparent. This is from temperature T2 to T0
It is considered that the crystal grows from a polycrystal to a single crystal through the semi-molten state of the organic low-molecular substance until the following.
Further heating to a temperature above T3 results in a translucent state intermediate between the maximum transparency and the maximum opacity. Next, when the temperature is lowered, the state returns to the original cloudy and opaque state without taking the transparent state again. This is considered to be because the organic low-molecular-weight substance was melted at a temperature of T3 or higher, and then cooled to precipitate polycrystals. When this opaque state is heated to a temperature between T1 and T2 and then cooled to room temperature, that is, a temperature equal to or lower than T0, an intermediate state between transparent and opaque can be obtained. In addition, the material which has become transparent at the normal temperature is again heated to a temperature of T3 or higher and then returned to the normal temperature, thereby returning to a cloudy and opaque state again. That is, both opaque and transparent forms at room temperature and intermediate states thereof can be taken.

Therefore, the heat-sensitive layer can be selectively heated by selectively applying heat to form a cloudy image on a transparent ground and a transparent image on a cloudy ground, and the change can be repeated many times. It is possible. If a colored sheet is arranged on the back side of such a heat sensitive body, a color image of the colored sheet on a white background or a white image on a colored background of the colored sheet can be formed. Further, when projected by an OHP (overhead projector) or the like, the cloudy portion becomes a dark portion, the transparent portion transmits light, and becomes a bright portion on the screen.

In order to form and erase an image using such a reversible thermosensitive recording material, it is necessary to have two thermal heads for image formation and image erasure, or to change the applied energy conditions. It is effective to use a device having a single thermal head for forming an image and erasing an image. In the former case, the cost of the apparatus increases because two thermal heads are required, but if the energy application conditions for each thermal head are different and the reversible thermosensitive recording material is passed once, the image formation and erasing can be performed. You can do it. In the latter case, in order to form and erase an image with one thermal head, the condition for applying energy to the thermal head at one time when the thermal recording material passes is adjusted according to the part where the image is formed and the part to be erased. Although the operation is complicated, the operation is complicated, for example, the image is formed under different energy conditions by changing the thermal recording material in a small direction or by erasing the image on the thermal recording material once and then running the thermal recording material in the opposite direction again. Therefore, the equipment cost is reduced.

The reversible thermosensitive recording material used in the present invention can be formed as a film on a support member or formed into a sheet by the following method, for example. 1) A method of dissolving a resin base material and an organic low-molecular substance in a solvent, applying this on a support member, and evaporating the solvent to form a film or sheet. 2) The resin base material is dissolved in a solvent in which only the resin base material is dissolved, and the organic low-molecular substance is pulverized or dispersed therein by various methods, applied to a support member, and the solvent is evaporated to form a film. Or a method of forming a sheet. 3) A method in which a resin base material and an organic low-molecular substance are heated and melted and mixed without using a solvent, and the resulting mixture is formed into a film or a sheet and cooled. The solvent for preparing the heat-sensitive layer or the heat-sensitive recording material can be variously selected depending on the type of the resin base material and the organic low-molecular substance, and examples thereof include tetrahydrofuran, methyl ethyl ketone, methyl isobutyl ketone, chloroform, carbon tetrachloride, ethanol, toluene, and benzene. No. In addition, of course, when a dispersion is used,
Even when a solution is used, in the heat-sensitive layer obtained, the organic low-molecular substance is precipitated as fine particles and exists in a dispersed state.

In the present invention, the resin used as the resin base material of the thermosensitive layer of the reversible thermosensitive recording material is preferably a resin which can form a film or sheet, has good transparency, and is mechanically stable. Examples of such a resin include polyvinyl chloride; vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, and vinyl chloride-acrylate copolymer. Vinylidene chloride copolymers such as polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-acrylonitrile copolymer; polyester; polyamide; polyacrylate or polymethacrylate or acrylate -Methacrylate copolymers; silicone resins and the like. These may be used alone or as a mixture of two or more.

On the other hand, the organic low-molecular substance may be any substance that changes from polycrystal to single crystal by heat in the recording layer (a substance that changes within the temperature range of T1 to T3 shown in FIG. 1).
Generally, those having a melting point of about 30 to 200 ° C, preferably about 50 to 150 ° C are used. Such organic low molecular weight substances include alkanol; alkane diol; halogen alkanol or halogen alkane diol; alkylamine; alkane; alkene; alkyne; halogen alkane; halogen alkene; halogen alkyne; cycloalkane; cycloalkene; cycloalkyne; Unsaturated mono- or dicarboxylic acids or their esters, amides or ammonium salts; saturated or unsaturated halogen fatty acids or their esters, amides or ammonium salts; allylcarboxylic acids or their esters, amides or ammonium salts; Esters, amides or ammonium salts thereof; thioalcohols; thiocarboxylic acids or their esters, amines or ammonium salts; Carboxylic acid esters, and the like. These may be used alone or in combination of two or more. These compounds have 10 to 10 carbon atoms.
60, preferably 10 to 38, particularly preferably 10 to 30. The alcohol group in the ester may be saturated, may not be saturated, and may be halogen-substituted. In any case, the organic low-molecular-weight substance contains at least one of oxygen, nitrogen, sulfur and halogen in the molecule, for example, -OH, -COOH, -CONH, -COOR, -N
_{H, -NH 2, -S -,} - S-S -, - O-, is preferably a compound containing a halogen and the like.

More specifically, these compounds include lauric acid, dodecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, henicosanoic acid, tricosanoic acid, lignoceric acid, serotinic acid, heptacosanoic acid, montanic acid, melisic acid, stearic acid. Higher fatty acids such as acid, behenic acid, nonadecanoic acid, araginic acid and oleic acid; esters of higher fatty acids such as methyl stearate, tetradecyl stearate, octadecyl stearate, octadecyl laurate, tetradecyl palmitate and dodecyl behenate; And ether or thioether. Among them, in the present invention, higher fatty acids, particularly palmitic acid, henicosanoic acid,
Higher fatty acids having 16 or more carbon atoms such as tricosanoic acid, lignoceric acid, pentadecanoic acid, nonadecanoic acid, arachinic acid, stearic acid, and behenic acid are preferable, and having 16 to 2 carbon atoms.
The higher fatty acid of 4 is more preferred.

Further, in order to widen the range of temperatures at which transparency can be achieved, the organic low-molecular substance described in this specification is appropriately combined, or such an organic low-molecular substance is mixed with another material having a different melting point. You can combine them. These are described, for example, in JP-A-63-39378 and JP-A-63-1303.
No. 80, and Japanese Patent Application Nos. 63-14754 and 1-140109, but the present invention is not limited thereto.

The weight ratio of the organic low-molecular substance to the resin base material in the heat-sensitive layer is preferably about 2: 1 to 1:16, more preferably 1: 1 to 1: 3. When the ratio of the resin base material is less than this, it becomes difficult to form an organic low-molecular substance in a film held in the resin base material. Becomes difficult.

The thickness of the heat-sensitive layer is preferably 1 to 3 μm,
-20 μm is more preferable. If the heat-sensitive layer is too thick, heat distribution within the layer will occur, making it difficult to achieve uniform transparency. On the other hand, if the heat-sensitive layer is too thin, the turbidity decreases and the contrast decreases. Further, the turbidity can be increased by increasing the amount of the organic low-molecular substance in the heat-sensitive layer.

In addition to the above components, additives such as a surfactant and a high-boiling solvent can be added to the heat-sensitive layer in order to facilitate formation of a transparent image. Specific examples of these additives are as follows. Examples of high boiling point solvents; tributyl phosphate, tri-2-phosphate
Ethylhexyl, triphenyl phosphate, tricresyl phosphate, butyl oleate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diheptyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate , Dioctyldecyl phthalate, diisodecyl phthalate, butylbenzyl phthalate,
Dibutyl adipate, di-n-hexyl adipate, di-2-ethylhexyl adipate, di-2 azelate
-Ethylhexyl, dibutyl sebacate, di-2-ethylhexyl sebacate, diethylene glycol dibenzoate, triethylene glycol di-2-ethyl butyrate, methyl acetyl ricinoleate, butyl acetyl ricinoleate, butyl phthalyl butyl glycolate, acetyl citric acid Tributyl.

Examples of surfactants and other additives: polyhydric alcohol higher fatty acid esters; polyhydric alcohol higher alkyl ethers; polyhydric alcohol higher fatty acid esters, higher alcohols, higher alkyl phenols, higher fatty acid higher alkyl amines, higher fatty acid amides Lower olefin oxide adducts of fats and oils or polypropylene glycol; acetylene glycol; Na, Ca, Ba or Mg salts of higher alkylbenzene sulfonic acids; higher fatty acids, aromatic carboxylic acids, higher fatty acid sulfonic acids, aromatic sulfonic acids, monoester sulfates Or Ca, Ba or Mg salts of phosphoric acid mono- or di-esters; low sulfated oils; poly long chain alkyl acrylates; acrylic oligomers; poly long chain alkyl methacrylates; Chromatography copolymers; styrene-maleic anhydride copolymer; olefin-maleic anhydride copolymer.

When an image of the recording material is used as a reflection image, providing a light reflecting layer on the back of the recording layer can increase the contrast even if the thickness of the recording layer is reduced. Specific examples include vapor deposition of Al, Ni, Sn and the like (described in JP-A-64-14079).

Further, a protective layer may be provided on the heat-sensitive layer of the present invention in order to prevent the surface from being deformed by the heat and pressure of the heating means by a writing method such as a thermal head and the transparency of the transparent portion being reduced. good. A protective layer (having a thickness of 0.1 mm) laminated on the heat-sensitive layer.
Materials of silicone rubber, silicone resin (described in JP-A-63-221087), and polysiloxane graft polymer (JP-A-63-210 μm)
317385), an ultraviolet curable resin or an electron beam curable resin (described in JP-A-2-566).
In any case, a solvent is used at the time of coating, and it is preferable that the solvent does not easily dissolve the resin of the thermosensitive layer and the organic low-molecular substance. Examples of the solvent that hardly dissolves the resin and the organic low-molecular substance in the heat-sensitive layer include n-hexane, methyl alcohol, ethyl alcohol, and isopropyl alcohol, and an alcohol-based solvent is particularly desirable in terms of cost.

Further, an intermediate layer can be provided between the protective layer and the heat-sensitive layer in order to protect the heat-sensitive layer from a solvent, a monomer component, and the like of the protective layer forming solution (Japanese Patent Application Laid-Open No. Hei.
No. 1). As the material of the intermediate layer, the following thermosetting resins and thermoreversible resins can be used in addition to those listed as the resin base material in the thermosensitive layer. That is, specific examples include polyethylene, polypropylene, polystyrene, polyvinyl alcohol, polyvinyl butyral, polyurethane, saturated polyester, unsaturated polyester, epoxy resin, phenol resin, polycarbonate, polyamide, and the like. The thickness of the intermediate layer varies depending on the application, but is preferably about 0.1 to 2 μm. Below this,
The protective effect is reduced, and above this, the thermal sensitivity is reduced.

The preheating means used in the present invention may be essentially any method such as the above-mentioned preheating means. As a method of heating a recording material of a reversible thermosensitive recording material, a method of transmitting heat from the outside to the recording material by heat conduction, and a method of transmitting energy other than heat, such as electromagnetic waves, mechanical vibration, or electric current, to the recording material from the outside. To convert it to heat. To heat a recording medium to a specific temperature by a method using conduction heat: a. Contact a recording material with a large heat capacity which has been heated to a specific temperature in advance. b. Contact with a heating element whose calorific value is suppressed. The two methods are effective. The former method corresponds to a heat roller and a heating fluid, and the latter method corresponds to a thermal head. The above-mentioned method has a feature that a constant temperature can be given to the recording medium without being affected by the temperature of the recording medium before preheating, and particularly, the structure of the heat roller and the hot plate can be simplified and the reliability can be improved. Also has the feature of being expensive. On the other hand, (1) the amount of heat radiated around is larger than that transmitted to the recording medium, so that the energy efficiency is low. 2. Since it requires a large volume, it becomes a bottleneck when miniaturizing the thermal recording apparatus. The latter method has a feature that it is basically suitable for miniaturization because it does not require a large volume. Especially when a thermal head is used, the area to be preheated is the same as the image. It can be arbitrarily determined with a resolution of the order. 4. If a thermal head is also used for recording, bidirectional recording can be performed by changing the roles of recording and preheating. There is also a feature. Furthermore, as in claim 3, 2
If a thermal head having more than one row of heating elements is used, recording and preheating can be performed with one thermal head, so that the size and reliability of the device can be further reduced. However, 5. The control of the thermal head is basically more complicated than that of a heat roller or a hot plate. 6. If the temperature of the recording medium before the pre-heating changes, the temperature after the pre-heating also changes, so it is necessary to make the calorific value of the thermal head correspond to it. 7. Even if a recording medium having the same static temperature characteristics is used, if the thickness, thermal conductivity, specific heat, etc. of the recording medium are different, the amount of heat required for heating the recording medium is different. Need to respond to that. Electromagnetic waves and sound waves specifically refer to infrared or microwave heating as heating by electromagnetic waves, and ultrasonic heating as heating by mechanical vibration. Although this does not include heating by current, this does not include so-called direct current heating in which a current flows directly to a recording medium.Heat using induction current is regarded as heating by electromagnetic waves in the present invention. . These methods have the characteristic that the recording medium can be heated uniformly in a shorter time than a heat roller, but the mechanism is complicated and it is difficult to reduce the size of the recording medium. When the state is changing, it is necessary to perform fine control corresponding to the change, as in the case of the thermal head.

As described above, since each of the preheating methods has advantages and disadvantages, it is desirable to design the thermal recording apparatus properly according to the purpose of use. For example, when a reversible thermosensitive recording material is used for a small-sized recording device for personal use or a device such as an electronic blackboard where it is desired to combine the mechanical parts as small as possible, preheating with a thermal head is appropriate, and the display of a prepaid card etc. A heat roller or a hot plate is suitable for a terminal using a thermal recording material because of a wide range of usage conditions. In a device intended for high-speed recording, preheating using electromagnetic waves or sound waves is excellent. The thermal recording device of the present invention is a multi-transfer ribbon,
It can be used in fields where durability of repeated printing by a thermal head is required.

[0028]

EXAMPLE 1 A thermosensitive recording apparatus as shown in FIG. 2 was manufactured, and a reversible thermosensitive recording material was applied to the surface thereof, and a repetitive test of recording and erasing an image was performed on a card used as a display section. The reversible thermosensitive recording material used is of a type in which higher fatty acids are dispersed in a resin. A polyvinyl chloride-vinyl acetate copolymer (VYHH manufactured by UCC) 13 parts by weight Behenic acid 7 parts by weight Stearic acid 5 parts by weight Tetrahydrofuran 75 parts by weight was applied to a 180 μm-thick polyester film with a wire bar. 120
The resultant was dried at ℃ to form a recording layer having a thickness of 15 μm. A protective layer made of an acrylic UV curable resin was further provided on this surface, and cut out to prepare a card. The reversible thermosensitive recording material of the prepared card shows the characteristic as shown in FIG. 1 as a static temperature characteristic.
At 70 ° C, the temperature for complete whitening was 75 ° C or higher. The image was formed by setting the temperature of the heat roller at 65 ° C. and writing with a thermal head. In this apparatus, the erasing is performed simultaneously with the preliminary heating by the heat roller.

Comparative Example 1 Using the same apparatus as in Example 1, the heat roller was removed from the apparatus, and a repeated test of image formation and erasure was performed. At this time, erasing was performed with the removed heat roller, and the image was recorded after the card was cooled to room temperature.

Embodiment 2 A thermal recording apparatus "electronic blackboard type information display apparatus" as shown in FIG.
Was manufactured and subjected to a repeated test of image formation and erasure.
The same reversible thermosensitive recording material as in Example 1 was applied to the transparent film in the figure.

Example 3 Using the same apparatus as in Example 2, one thermal head was removed, and a repeated test of image formation and erasure was performed. At this time, recording, erasing, and preheating were performed with the remaining one thermal head, and recording was performed with a constant time interval from erasing to recording so that recording could be performed before the transparent film was cooled to room temperature after erasing.

Comparative Example 2 The same apparatus as in Example 2 was used except that one thermal head was removed, and a repeated test of image formation and erasure was performed. At this time, the image formation and erasure are performed by one remaining thermal head without performing preheating, and recording is performed with a sufficient time interval from image erasure to image formation so that the transparent film is cooled to room temperature after erasure. Was.

Example 4 Two thermal heads were removed with the same device as in Example 2,
Instead, one thermal head provided with two rows of heating elements as shown in FIG. 4 was used to perform a repeated test of image formation and erasure.

Table 1 shows the change in image density due to repeated printing in the examples and comparative examples. Image density was measured with a Macbeth reflection densitometer. Since the color of the image is white, the smaller the numerical value, the higher the density.

[0035]

[Table 1]

[0036]

According to the reversible thermosensitive recording method of the present invention and the apparatus therefor , the preheating method is carried out before forming and / or erasing the image, or the apparatus for the preheating is provided. This has the effect that the thermal gradient in forming and erasing is small, the resolution of the image is excellent, and the image density does not decrease much even if image formation and erasing are repeated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a change in transparency of a reversible thermosensitive recording material according to the present invention due to heat.

FIGS. 2A and 2B show a thermosensitive recording apparatus for a reversible thermosensitive recording material provided with a heat roller as preheating equipment.

FIG. 3 is a thermosensitive recording apparatus for a reversible thermosensitive recording material provided with a thermal head as a preheating facility.

FIG. 4 shows a thermosensitive recording apparatus for a reversible thermosensitive recording material in which two rows of heating elements are provided and one row is provided with a thermal head for preheating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat roller 2 Thermal head 3 Card 4 Press roller for heat roller 5 Platen roller 6 Transparent film 7 Thermal head 8 Platen roller 9 Film support roller 10 Heating element

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiko Hotta 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company Limited (72) Inventor Yukio Konagaya 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Toru Nogiwa 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (56) References JP-A-62-108092 (JP, A) JP-A-62- 246749 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41J 2/32 B41M 5/26 B41M 5/28-5/30 B41M 5/36

Claims (5)

(57) [Claims] 1. A performs formation of the recording material to the image and / or erase using a reversible thermosensitive recording material, and the formation of images and
In a recording method in which the heating temperature for erasure is different , the erasure of the image and the preliminary heating are performed by the same heating equipment before image formation .
Reversible thermosensitive recording method, which comprises carrying out simultaneously I. 2. The reversible thermosensitive recording method according to claim 1, wherein the recording medium is a card. 3. A recording apparatus used in the practice of the reversible thermosensitive recording method according to any one of claims 1 to 2,
Heating equipment for forming an image on a recording medium using a reversible thermosensitive recording material, and simultaneous erasing and preheating before image formation
A reversible thermosensitive recording apparatus , comprising: a heating facility for dual use of image erasing and preliminary heating for performing the following . 4. A heating facility for simultaneously erasing and preheating the image includes a constant temperature heat source, a heating fluid, an electromagnetic wave irradiation facility,
4. The reversible thermosensitive recording device according to claim 3, wherein the recording device is at least one selected from an acoustic wave irradiation facility and a thermal head. 5. The reversible head according to claim 3, wherein the heating elements are provided with two or more rows, and a thermal head is used in which at least one of the heating elements is used for image erasing and preheating. Thermal recording device.