JPH09141907A - Method and device for recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely erase a recorded visible image and to prevent the image from remaining by a method wherein a reversible thermally sensitive recording medium is reheated after preliminarily heating so that a whole part of the medium is surely heated to a transparentizing temperature in a short time and the temperature is maintained. SOLUTION: A reversible thermally sensitive recording medium 1 is inputted from a recording medium insertion inlet and is reciprocated through a thermal head 5 and an erasing thermal head 6. When the reversible thermally sensitive recording medium 1 is reciprocated, the erasing thermal head 6 is heated, then the reversible thermally sensitive recording medium 1 is preliminarily heated in the outward journey to be heated to a temperature in the vicinity of a transparentizing temperature and is heated again in the inward journey so that the reversible thermally sensitive recording medium 1 is surely heated to the transparentizing temperature to completely erase the visible image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device that repeats recording and erasing on a rewritable reversible thermosensitive recording medium,
Particularly, it relates to improvement of erasing efficiency.

[0002]

2. Description of the Related Art In recent years, as disclosed in, for example, Japanese Utility Model Application Laid-Open No. 2-3876, a reversible thermosensitive recording medium which can reversibly change its transparency with temperature and repeat recording and erasing of information has been developed. , Used to display various information. This reversible thermosensitive recording medium 1 has a polymer / low molecular composite in which an organic low molecular substance 33 is dispersed in a polymer 32 on a base film 31 made of a polyester film or the like as shown in the configuration diagram of FIG. A recording layer 34 made of a recording material of a type is provided, and an overcoat layer 35 is provided on the recording layer 34.
Is provided to protect the recording layer 34. The recording material forming the recording layer 34 of the reversible thermosensitive recording medium 1 is shown in FIG.
As shown in, the transmittance changes when heated and cooled. For example, when the recording material which is in a cloudy state at room temperature A below the temperature T ₁ shown in FIG. 9 is heated, the transmittance starts increasing from the temperature T ₂ and reaches the maximum transparent state B at the temperature T ₃ . When the recording material is cooled to room temperature in the state B in which the state becomes maximum transparent, the state C is maintained. Next, when the recording material which is in the maximum transparent state at room temperature C is reheated to the state D which is higher than the temperature T _{3 and} is higher than the temperature T _{4 as} shown by the broken line in FIG. 9, the maximum transparent state and the maximum cloudy state are obtained. It becomes the intermediate state of. Returns to the original maximum opaque state when cooled from this state D until the temperature T ₁ of the following room temperature conditions A. Reversible thermosensitive recording medium 1
The recording and erasing of a visible image can be repeated by utilizing the change in the transmittance of this recording material.

A recording apparatus for repeatedly recording and erasing a visible image on the reversible thermosensitive recording medium 1 is disclosed in, for example, Japanese Patent Laid-Open No. 5-4446.
No. 6,086,045. As shown in FIG. 10, the recording apparatus disclosed in Japanese Patent Laid-Open No. 5-4446 has a thermal head 6 for erasing and a thermal head 5 for recording, and has a carrying roller 3 and a platen roller 4. When the reversible thermosensitive recording medium 1 is sent by the position detection sensor 36 in the preceding stage of the erasing thermosensitive head 6, the erasing thermosensitive recording medium 1 is detected immediately before the reversible thermosensitive recording medium 1 reaches the erasing thermal head 6. The head 6 is rapidly heated to the clearing temperature of the reversible thermosensitive recording medium 1, and when the clearing temperature is reached, a pulse current is passed through the erasing thermal head 6 to maintain the clearing temperature and the reversible thermosensitive recording medium 1 is recorded. The layer is clarified to clear the cloudy visible image. After that, a new visible image is written on the reversible thermosensitive recording medium 1 by the thermal head 5. By repeating this operation, the reversible thermosensitive recording medium 1 can be used any number of times. In addition, the reversible thermosensitive recording medium 1 sent by the transport roller 3 is detected, and the erasing thermal head 6 having a small heat capacity is rapidly heated to erase the visible image. Miniaturization and energy saving can be achieved.

[0004]

However, when the visible image recorded on the reversible thermosensitive recording medium is to be erased by one erasing thermal head, the reversible thermal recording is sent by the carrier roller. The contact time between the medium and the erasing thermal head is short, sufficient heat energy cannot be applied to the reversible thermosensitive recording medium, and the temperature of the entire reversible thermosensitive recording medium cannot be uniformly raised to the clearing temperature. In some cases, there is a problem that the entire visible image cannot be erased and remains unerased.

The present invention has been made in order to solve the above disadvantages, and it is possible to surely erase a visible image recorded on a reversible thermosensitive recording medium and to continuously perform erasing and recording. It is an object of the present invention to obtain a recording method and a recording device capable of performing the above.

[0006]

A recording method according to the present invention is characterized in that a reversible thermosensitive recording medium capable of repeating recording and erasing is applied with heat energy for erasing a plurality of times before erasing. To do.

The recording apparatus according to the present invention is a recording apparatus in which recording and erasing are repeated on a reversible thermosensitive recording medium, and the recording head, one or a plurality of erasing thermal heads, and the reversible thermosensitive recording medium are reversible thermosensitive recording media. Driving means for reciprocating from the recording medium insertion port through the recording head and the erasing thermal head, erasing control means for causing the erasing thermal head to generate heat during conveyance of the reversible thermal recording medium, and the reversible thermal recording medium for erasing Print control means for causing the recording head to perform a printing operation when the thermal head reciprocates and passes through the recording head.

A second recording apparatus according to the present invention is a recording apparatus in which recording and erasing are repeatedly performed on a reversible thermosensitive recording medium, and a recording head and front and rear stages of the recording head in a moving direction of the reversible thermosensitive recording medium. Alternatively, one or a plurality of erasing thermal heads provided before or after the recording head, driving means for reciprocating the reversible thermosensitive recording medium through the erasing thermal head and the recording head, and a reversible thermosensitive recording medium Erasing control means for causing the erasing thermal head to generate heat during transportation, and printing control means for causing the recording head to perform a printing operation when the reversible thermosensitive recording medium reciprocates the erasing thermal head in the subsequent stage and passes through the recording head. It is characterized by having and.

A third recording apparatus according to the present invention is a recording apparatus which repeats recording and erasing on a reversible thermosensitive recording medium, and is provided in front of the recording head and the recording head in the moving direction of the reversible thermosensitive recording medium. A plurality of erasing thermal heads, a driving means for moving the reversible thermosensitive recording medium through the erasing thermal head and the recording head, and an erasing control means for causing the erasing thermal head to generate heat while the reversible thermal recording medium is being conveyed. And a print control means for causing the recording head to perform a printing operation when the reversible thermosensitive recording medium passes through the erasing thermal head and the recording head.

It is desirable that the erasing thermal head be formed on a ceramic substrate and have a strip-shaped film-shaped heating resistor that is orthogonal to the transport path of the reversible thermal recording medium. Further, it is preferable to cover the film-shaped heating resistor of the erasing thermal head with a protective film of crystallized glass.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a thermal head and an erasing thermal head are provided along a transport path of the reversible thermal recording medium of a recording device for recording and erasing the reversible thermal recording medium. Arrange in order from. The driving means for conveying the reversible thermosensitive recording medium reciprocates the reversible thermosensitive recording medium from the recording medium insertion port through the recording head and the erasing thermal head. When the reversible thermosensitive recording medium reciprocates, the erasing thermosensitive head is caused to generate heat, the reversible thermosensitive recording medium is preheated on the outward path and heated to near the clearing temperature, and then on the return path again the reversible thermosensitive recording medium. Is heated to ensure that the reversible thermosensitive recording medium reaches the clearing temperature and is maintained for a certain period of time to completely erase the visible image to be erased. When the reversible thermosensitive recording medium from which the visible image has been erased passes the thermal head on the return path, a new visible image is recorded.

Further, by providing the erasing thermal head for preheating in the preceding stage or the latter stage of the thermal head, the number of times the reversible thermosensitive recording medium is heated is increased and the reversible thermosensitive recording medium is heated to a uniform temperature in a short time. Can be heated to.

Further, when the reversible thermosensitive recording medium is moved only from one direction, a plurality of erasing thermal heads are provided on the upstream side of the thermal head in the conveying path of the reversible thermosensitive recording medium. By heating the medium in a stepwise manner, the reversible thermosensitive recording medium is heated to a uniform temperature to prevent unerased visible images from being erased.

Further, the erasing thermal head is formed on a ceramic substrate and is composed of a strip-shaped film-shaped heating resistor which is orthogonal to the transport path of the reversible thermal recording medium, and has a small heat capacity to form the reversible thermal recording medium. Heat evenly. Further, the film-shaped heating resistor is covered with a protective film of crystallized glass to prevent the surface of the reversible thermosensitive recording medium from being scratched.

[0015]

FIG. 1 is a layout diagram showing the configuration of an embodiment of the present invention. As shown in the figure, a recording device 2 for recording and erasing the reversible thermosensitive recording medium 1 has a plurality of conveying rollers 3 and a plurality of platen rollers 4 along a conveying path of the reversible thermosensitive recording medium 1. A thermal head 5, a thermal erasing head 6 and a magnetic head 7 are arranged in order from a recording medium insertion port 8. The thermal head 5 records a visible image on the reversible thermosensitive recording medium 1. As shown in the cross-sectional view of FIG. 2, the erasing thermal head 6 is formed on a ceramic substrate 9 having a thickness of 1 mm, for example, and has a width of 2 mm and a thickness perpendicular to the conveyance path of the reversible thermosensitive recording medium 1. Strip-shaped heating resistor 1 with a width of 20 μm
0 and a protective film 11 made of crystallized glass that covers the film-shaped heat generating resistor 10. By applying a pulse current to the film-shaped heat generating resistor 10, the surface of the protective film 11 is heated to a constant temperature and reversible. The visible image recorded on the heat-sensitive recording medium 1 is erased. An initial position detection sensor 12 is provided at the rear stage of the transport roller 3 provided close to the recording medium insertion port 8, and a reversal detection sensor 13 is provided at the front stage of the transport roller 3 at the final stage. There is.

As described above, the erasing thermal head 6 is constituted by the strip-shaped film-shaped heating resistor 10 provided on the ceramic substrate 9, so that the thermal capacity of the erasing thermal head 6 can be reduced and the heating speed and cooling can be reduced. The reversible thermosensitive recording medium 1 can be heated uniformly while increasing the speed. Further, by covering the film heating resistor 10 with the protective film 11 of crystallized glass, it is possible to prevent the surface of the reversible thermosensitive recording medium 1 from being scratched.

As shown in the block diagram of FIG. 3, the control section of the recording apparatus 1 instructs the main control section 21 for controlling the operation of the entire apparatus and recording and erasing on the reversible thermosensitive recording medium 1, and the operating state. Operation display section 22 and input section 2 for displaying information such as
3, a memory 23, a conveyance control unit 25, a print control unit 26, an erasing control unit 27, and a reading control unit 28. Input unit 23
Inputs information to be recorded on the reversible thermosensitive recording medium 1 and stores it in the memory 24. The transport control unit 25 drives the transport motor 14 that drives each of the transport rollers 3 and controls forward rotation and reverse rotation. The print controller 26 controls the recording operation of the thermal head 5. The erasing control unit 27 energizes the erasing thermal head 6 to control the temperature. The reading control unit 28 controls the reading operation of the magnetic head 7.

The operation of erasing the visible image recorded on the reversible thermosensitive recording medium 1 and recording new information as a visible image by the recording device 2 configured as described above is shown in the time chart of FIG. It will be described with reference to FIG.

The reversible thermosensitive recording medium 1 has a recording medium insertion port 8
When recording and erasing are instructed from the operation display unit 22 when set to, the main control unit 21 instructs the transport control unit 25 to transport the reversible thermosensitive recording medium 1. When the conveyance control unit 25 is instructed to convey the reversible thermosensitive recording medium 1, the conveyance controller 14 drives the conveyance motor 14 in the normal direction at a constant speed. The transport roller 3 is rotated by the drive of the transport motor 14 to transport the set reversible thermosensitive recording medium 1 along the thermal head 5, the erasing head 6 and the magnetic head 7. When the reversible thermosensitive recording medium 1 is conveyed and the leading end of the reversible thermosensitive recording medium 1 is detected by the reversal detection sensor 13, the conveyance control unit 25 sets the conveyance mode at a predetermined constant time t _1. The reversible thermosensitive recording medium 1 is conveyed to the recording medium insertion port 8 side by reversing the rotation of the conveyance roller 3 and reversing the reversible thermosensitive recording medium 1. While reversing the reversible thermosensitive recording medium 1, the reversible thermosensitive recording medium 1 is heated by the erasing thermal head 6 to erase the visible image recorded on the reversible thermosensitive recording medium 1. New information is recorded as a visible image by the thermal head 5.

When the conveyance of the reversible thermosensitive recording medium 1 is started in this way and the leading end of the reversible thermosensitive recording medium 1 is detected by the initial position detecting sensor 12, the erasing control section 27 causes the erasing thermal head to be erased. Power is supplied to 6 to control the surface temperature of the erasing thermal head 6 to a predetermined transparentizing temperature of the reversible thermosensitive recording medium 1. In this state, the reversible thermosensitive recording medium 1 is sent to the position of the erasing thermal recording head 6, and when the reversible thermosensitive recording medium 1 contacts the erasing thermal recording head 6, the erasing thermal recording head 6 heats the reversible thermal recording medium 1. Energy is applied to preheat the reversible thermosensitive recording medium 1 while the reversible thermosensitive recording medium 1 is in contact with the erasing thermosensitive head 6, and the temperature of the reversible thermosensitive recording medium 1 is raised to near the clearing temperature. The tip of the preheated reversible thermosensitive recording medium 1 is the reversal detection sensor 1
When the reversible thermosensitive recording medium 1 is detected by 3 and the moving direction is reversed, the reversible thermosensitive recording medium 1 again contacts the erasing thermosensitive head 6 to be heated to the clearing temperature and maintained for a certain time to be recorded on the reversible thermosensitive recording medium 1. Delete the visible image. As described above, when the reversible thermosensitive recording medium 1 is moving, the reversible thermosensitive recording medium 1 is preheated on the outward path and heated again on the return path.
It is possible to heat the transparent image to a clearing temperature and maintain it for a certain period of time by applying sufficient heat energy to completely erase the visible image recorded on the reversible thermosensitive recording medium 1.

On the other hand, when the transport motor 14 is reversed and the moving direction of the reversible thermosensitive recording medium 1 is reversed so that the leading end of the reversible thermosensitive recording medium 1 passes the position of the reversal detection sensor 13, the print control section. Reference numeral 26 starts the printing operation of the thermal head 5 at a print timing t ₂ preset according to the moving speed of the reversible thermosensitive recording medium 1 to form a visible image showing new information on the reversible thermosensitive recording medium 1. Record. The reversible thermosensitive recording medium 1 on which the new visible image is recorded is ejected from the recording medium insertion port 8. Then, after the reversal detection sensor 13 detects the reversible thermosensitive recording medium 1, the initial position detection sensor 12 detects the reversible thermosensitive recording medium 1 again, and when the detection signal is turned off, the erasing control unit 27 causes the erasing thermosensitive recording medium 1 to disappear. The current supplied to the head 6 is cut off. Further, the conveyance control unit 25 detects the reversible thermosensitive recording medium 1 by the reversal detection sensor 13, and then the initial position detection sensor 12 detects the reversible thermosensitive recording medium 1 again, and the detection signal is kept constant after being turned off. At timing t ₃ , the driving of the transport motor 14 is stopped, and the operation of erasing the visible image on the reversible thermosensitive recording medium 1 and the operation of recording a new visible image are completed.

The erasing of the visible image recorded on the reversible thermosensitive recording medium 1 in this manner was repeated 50 times to record a new visible image, but the visible image to be erased was completely erased, A new visible image could be recorded well.

In addition, the temperature of the erasing thermal head 6 when erasing the visible image recorded on the reversible thermosensitive recording medium 1 is varied to repeatedly erase, thereby completely erasing the erasing thermal head 6. As a result of examining the erasing temperature range, the erasing temperature range of the erasing thermal head 6 has a temperature range of about 20 ° C., and it was possible to completely erase the erasing temperature range of about 10 ° C. even after 1 month. . For comparison, the reversible thermosensitive recording medium 1 was not heated by the erasing thermosensitive head 6 on the outward path, and the reversible thermosensitive recording medium 1 was heated only on the return path to repeat erasing and recording, and about 10 times. After repeated, it disappeared and the rest remained. The erasing temperature range of the erasing thermal head 6 which is completely erased at this time was about 10 ° C., and the erasing temperature range after one month elapsed was about 4 ° C.

As described above, when the reversible thermosensitive recording medium 1 is reciprocatingly moved, the reversible thermosensitive recording medium 1 is preheated in the forward path and then reheated in the return path. Can give enough heat evenly,
A wide erasing temperature range can be set, and stable erasing can be performed.

In the above embodiment, the erasing thermal head 6 is provided after the thermal head 5, but as shown in FIG. 5, the erasing thermal head is provided after the thermal head 5. In addition to 6, the erasing thermal head 6a for preheating may be provided in front of the thermal head 5. In this case, as shown in the time chart of FIG.
At the same time when the transport motor 13 is driven to start the transport of the reversible thermosensitive recording medium 1, the erasing thermal head 6a for preheating is simultaneously formed.
An electric current is applied to the reversible thermosensitive recording medium 1 to be heated to a predetermined temperature and preheated. When the reversible thermosensitive recording medium 1 passes the position of the erasing thermal recording medium 6a and the reversal detection sensor 13 detects the reversible thermosensitive recording medium 1, the current of the erasing thermal recording head 6a is cut off. Thus, the reversible thermosensitive recording medium 1 is preheated on the outward path by the erasing thermal head 6a for preheating and the erasing thermal head 6 provided at the subsequent stage of the thermal head 5, and further on the returning path by the erasing thermal head 6. Since it is heated, the reversible thermosensitive recording medium 1 can be reliably heated and maintained at the clearing temperature, and the visible image to be erased can be completely erased.

In each of the above embodiments, the case where the reversible thermosensitive recording medium 1 is moved back and forth has been described. However, even when the reversible thermosensitive recording medium 1 is moved in only one direction, a preliminary operation is performed as in the above embodiments. By heating, it is possible to prevent a visible image to be erased from being left unerased.

FIG. 7 is a layout diagram showing the configuration of an embodiment in which the reversible thermosensitive recording medium 1 is moved in only one direction. As shown in the figure, the recording apparatus 1a includes a magnetic head 7 and a erasing medium for preheating in order from the upstream side of the conveying path of the reversible thermosensitive recording medium 1 having a plurality of conveying rollers 3 and a plurality of platen rollers 4. A thermal head 6a, an erasing thermal head 6 and a thermal head 5 are arranged. An initial position detection sensor 12 is provided at the rear stage of the transport roller 3 provided close to the recording medium insertion port 8, and an end detection sensor 15 is provided at the front stage of the final transport roller 3. ing.

When the reversible thermosensitive recording medium 1 starts to be conveyed and the leading end of the reversible thermosensitive recording medium 1 is detected by the initial position detection sensor 11 in the recording apparatus 1a constructed as described above, preheating is performed. The erasing heat sensitive head 6a and the erasing heat sensitive head 6 are energized and heated to predetermined temperatures. In this state, the reversible thermosensitive recording medium 1 is sent to the erasing thermal head 6a and preheated. The preheated reversible thermosensitive recording medium 1 was further heated by the next erasing thermosensitive head 6, the reversible thermosensitive recording medium 1 was maintained at the clearing temperature for a certain time, and recorded on the reversible thermosensitive recording medium 1. Erase the visible image. On the other hand, the thermal head 5 starts the printing operation at a certain print timing after the leading edge of the reversible thermosensitive recording medium 1 is detected by the initial position detection sensor 12, and the reversible thermosensitive image in which the visible image has been erased. Predetermined information is recorded on the recording medium 1 to form a visible image. When the end portion of the reversible thermosensitive recording medium 1 on which the visible image is recorded is detected by the end detection sensor 15, the current flowing through the erasing thermal head 6a for preheating and the erasing thermal head 6 is cut off. To return to the initial state. Since erasing and recording are surely repeated while moving the reversible thermosensitive recording medium 1 only in one direction in this manner, the moving length of the reversible thermosensitive recording medium 1 can be shortened and the processing time can be shortened. In addition to the above, a large number of reversible thermosensitive recording media 1 can be continuously processed.

In each of the above embodiments, one or two erasing thermal heads are provided. However, the number of erasing thermal heads is increased in accordance with the transport speed of the reversible thermosensitive recording medium 1, and the reversible thermal recording head is reversible. The thermosensitive recording medium 1 can be reliably heated to the clearing temperature and held for a certain period of time.

Further, in the above embodiment, the magnetic head 7, the erasing thermal head 6a, the erasing thermal head 6 and the thermal head 5 are arranged in this order from the upstream side of the conveying path of the reversible thermosensitive recording medium 1.
However, the thermal heads 6 and 6a for erasing may be provided upstream of the magnetic head 7 or the magnetic head 7 may be provided downstream of the thermal head 5.

In the above embodiment, the thermal head is used as the recording head, but a laser or the like may be used.

[0032]

As described above, according to the present invention, when the visible image recorded on the reversible thermosensitive recording medium is erased, the reversible thermosensitive recording medium is preheated and then reheated. It is possible to reliably raise the temperature of the entire thermosensitive recording medium to the clearing temperature and maintain it in a short time, and it is possible to reliably erase the recorded visible image and prevent the unerased residue from occurring.

Further, the recording head and the erasing thermal head are arranged along the transport path of the reversible thermal recording medium, and the reversible thermal recording medium is reciprocally moved to preheat with one erasing thermal head. And reheating can be performed, and the overall size of the device can be reduced.

Further, by providing the erasing thermal head for preheating at the front stage or the rear stage of the thermal head, the number of times the reversible thermosensitive recording medium is heated can be increased and the reversible thermosensitive recording medium can be heated in a short time. It can be heated to a uniform temperature.

Further, a plurality of erasing thermal heads are provided on the upstream side of the thermal head in the conveying path of the reversible thermal recording medium, and the reversible thermal recording medium is heated step by step to form the reversible thermal recording medium. It can be heated to a uniform temperature, and the processing time can be shortened to prevent the unerased visible image from being erased. Therefore, a large number of reversible thermosensitive recording media can be continuously erased and recorded.

Further, the erasing thermal head is formed on the ceramic substrate and is composed of a strip-shaped thick film heating resistor which is orthogonal to the transport path of the reversible thermal recording medium, thereby reducing the heat capacity and heating and cooling. The heating can be performed rapidly and the reversible thermosensitive recording medium can be uniformly heated.

Further, since the surface of the reversible thermosensitive recording medium in which the thick film heating resistor is covered with the protective film of crystallized glass is prevented from being scratched, the reversible thermosensitive recording medium is erased without damage.
The recording can be repeated.

[Brief description of the drawings]

FIG. 1 is a layout diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of an erasing thermal head.

FIG. 3 is a block diagram showing a configuration of a control unit of the above embodiment.

FIG. 4 is a flowchart showing the operation of the embodiment.

FIG. 5 is a layout diagram showing a configuration of a second embodiment.

FIG. 6 is a flowchart showing the operation of the second embodiment.

FIG. 7 is a layout diagram showing a configuration of a third embodiment.

FIG. 8 is a cross-sectional view showing the structure of a reversible thermosensitive recording medium.

FIG. 9 is a temperature-transmittance characteristic diagram showing reversible characteristics of a reversible thermosensitive recording medium.

FIG. 10 is a layout diagram showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reversible thermosensitive recording medium 3 Transport roller 5 Thermal head 6 Erase thermal head 9 Ceramic substrate 10 Membrane heating resistor 11 Protective film 12 Initial position detection sensor 13 Reversal detection sensor 14 Transport motor

Claims (6)

[Claims] 1. A recording method, wherein recording is carried out after erasing by applying heat energy for erasing to a reversible thermosensitive recording medium capable of repeating recording and erasing a plurality of times. 2. A recording device for repeating recording and erasing on a reversible thermosensitive recording medium, wherein a recording head, one or more erasing thermal heads, and a reversible thermosensitive recording medium are recorded from a reversible thermosensitive recording medium insertion port. Means for reciprocating through the recording head and the erasing thermal head, erasing control means for causing the erasing thermal recording medium to generate heat during conveyance of the reversible thermal recording medium, and the reversible thermal recording medium reciprocating the erasing thermal recording head. And a print control means for causing the print head to perform a printing operation when passing through the print head. 3. A recording apparatus which repeats recording and erasing on a reversible thermosensitive recording medium, wherein the recording head and the recording head are provided in a stage before and after the recording head in a moving direction of the reversible thermosensitive recording medium or in a stage before or after the recording head. One or a plurality of erasing thermal heads provided, driving means for reciprocating the reversible thermosensitive recording medium through the erasing thermal recording head and the recording head, and heat generated by the erasing thermal recording head during conveyance of the reversible thermal recording medium. Erasing control means, and a printing control means for causing the recording head to perform a printing operation when the reversible thermosensitive recording medium reciprocates the erasing thermal head in the subsequent stage and passes through the recording head. Recording device. 4. A recording apparatus for repeating recording and erasing on a reversible thermosensitive recording medium, comprising: a recording head; and a plurality of erasing thermal heads provided before the recording head in a moving direction of the reversible thermosensitive recording medium. Driving means for moving the reversible thermosensitive recording medium through the erasing thermal head and the recording head, erasing control means for causing the erasing thermal head to generate heat during conveyance of the reversible thermosensitive recording medium, and erasing the reversible thermosensitive recording medium And a print control means for causing the print head to perform a printing operation when passing through the print head. 5. A recording apparatus according to claim 2, 3 or 4, wherein said erasing thermal head has a strip-shaped film-shaped heating resistor formed on a ceramic substrate and orthogonal to the transport path of the reversible thermal recording medium. 6. The recording apparatus according to claim 5, wherein the film-shaped heating resistor of the erasing thermal head is covered with a protective film of crystallized glass.