JP3037591B2 - Magnetic display sheet printing method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for printing a magnetic display sheet capable of storing or erasing an image by a magnetic field.

[0002]

2. Description of the Related Art Conventionally, a magnetic display sheet has been proposed as a magnetic display medium on which arbitrary information can be magnetically written or erased. This magnetic display sheet is used by itself or attached to a card or the like to display various kinds of information such as necessary characters and figures. Such magnetic display sheets have been filed in Japanese Patent Publication No. 48-41221 and Japanese Patent Application Laid-Open No. Hei 5-16578. This magnetic display sheet has countless microcapsules,
The microcapsules are filled with a suspension in which a sensitive magnetic piece sensitive to a magnetic field is dispersed in a transparent liquid. Therefore, when a perpendicular magnetic field is applied to the magnetic display sheet, the sensitive magnetic pieces are aligned by the action of the magnetic field, and in this aligned state, light passes through the back side of the magnetic display sheet, and the back color appears. As a result, characters, figures, and the like can be displayed based on the difference in contrast, and the sensitive magnetic piece can be changed by a horizontal magnetic field, so that the back color can be shielded. Therefore, the magnetic display sheet can be used as a writable or erasable display means.

Japanese Patent Laid-Open Publication No. Hei.
17089, JP-A-5-12049, JP-A-55-
No. 12011 is known.

[0004]

By the way, the viscosity of the suspension filled in the microcapsules constituting the magnetic display sheet has a characteristic that varies depending on the temperature.
In a low temperature state, the viscosity of the suspension is high, and the behavior of the sensitive magnetic piece subjected to the magnetic field becomes dull. As a result, the contrast in the magnetic display decreases, and the print quality deteriorates. This is because, when the sensitive magnetic piece is maintained in an inclined state, light is reflected by the sensitive magnetic piece, which adds to the background color. In a high temperature state, the viscosity of the suspension is low, and the sensitive magnetic piece that has received the magnetic field has a sharp behavior, and reacts sensitively even to a slight magnetic flux. In this case, the contrast decreases along with the resolution of the magnetic display, and the print quality deteriorates. For this reason,
The magnetic display sheet has a drawback that the operating temperature range is narrow, and may not be used in a low-temperature environment.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic display sheet printing method and apparatus which realizes a constant optimization of a printing process without being affected by a use environment temperature or a magnetic display sheet temperature. And

[0006]

The magnetic display sheet printing method of the present invention is a magnetic display sheet printing method for performing magnetic display by the action of a magnetic field, wherein the temperature of the magnetic display sheet (2) to be printed is determined. When the detected temperature is lower than a predetermined temperature, the magnetic display sheet is heated, and when the detected temperature is higher than a predetermined temperature , a magnetic field for performing magnetic display on the magnetic display sheet is generated. Print head generated (52)
The driving condition is set such that the lower the detection temperature is, the lower the magnetic energy becomes.
Is set to be large .

[0007] In addition, the driving conditions of the print head, the
The current supply width is set to be larger as the detected temperature becomes lower .

[0008] In addition, the driving conditions of the print head, the
It is characterized in that the applied voltage is set higher as the detection temperature becomes lower .

The magnetic display sheet printing apparatus of the present invention is a magnetic display sheet printing apparatus for performing magnetic display by the action of a magnetic field, wherein the magnetic display sheet performs magnetic display on the magnetic display sheet (2). Generated print head (5
2), temperature detecting means (temperature sensor 40) for detecting the temperature of the magnetic display sheet to be printed, heating means (heating roller 46) for heating the magnetic display sheet, and temperature detected by the temperature detecting means. Is less than a predetermined temperature , heating the magnetic display sheet by the heating means,
The temperature when the temperature detected by the detecting means on the predetermined temperature or more <br/>, the control means for controlling so that the magnetic energy as the detected temperature becomes lower the driving conditions of the print head increases (the controller 20).

[0010]

The behavior of the sensitive magnetic piece in the suspension in the microcapsules constituting the magnetic display sheet is proportional to the magnetic energy applied to the sensitive magnetic piece when the viscosity of the suspension is constant. The viscosity of the suspension changes according to the temperature. Therefore, in the method and apparatus for printing a magnetic display sheet of the present invention, when the temperature of the magnetic display sheet is lower than a predetermined temperature, the temperature on the magnetic display sheet side is increased, and the temperature of the magnetic display sheet is higher than the predetermined temperature. In this case, the driving conditions on the print head side are controlled. That is, the temperature of the magnetic display sheet to be printed is detected, and if the detected temperature is lower than the predetermined temperature, the magnetic display sheet is heated. Ho
By setting the magnetic energy so as to increase , printing can be performed with the magnetic energy optimized according to the viscosity of the suspension, and the quality of the magnetic display can be improved.

[0011] The driving conditions, the detection temperature of the magnetic display sheet
Set the power supply width to the print head larger as it gets lower .
By that, it is possible to print by optimized magnetic energy in accordance with the viscosity of the suspension.

[0012] The driving conditions, the detection temperature of the magnetic display sheet
The lower the voltage, the higher the applied voltage to the print head
By doing so, printing can be performed with magnetic energy optimized according to the viscosity of the suspension.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of a magnetic display sheet printing method and apparatus according to the present invention. The magnetic display sheet 2 to be printed is fixed to, for example, a card 3.
A transport belt 4 is provided as means for transporting the card 3, and the transport belt 4 includes transport rollers 6 and 8.
Has been hung around. A pulley 12 is attached to a drive shaft 10 of the transport roller 6, and a rotational force from a transport motor 14 as a driving unit is transmitted to the pulley 12 through a pulley 16 and a belt 18. The transport motor 14 is provided with a drive output from a transport motor drive circuit 24 of a control device 20 provided as a control means, whereby the rotation of the transport motor 14 is transmitted to the transport belt 4 and the magnetic display sheet 2 is rotated. It is transported together with the transport belt 4. The control output from the central processing unit (CPU) 26 of the control device 20 is supplied to the input / output unit (I /
O) 28.

The rotation of the transport motor 14 is detected by a rotation detector 32 attached to the rotating shaft 30 of the transport motor 14 as a rotation detecting means for directly detecting the rotation of the motor.

In this embodiment, the magnetic display sheet 2 is conveyed by the conveyor belt 4 in the direction of arrow A, and the first, second and third positions are used as means for detecting the position of the magnetic display sheet 2. Sensors 34, 36 and 38 are provided, and each position detection signal is applied to I / O 28.

A temperature sensor 40 is provided as first temperature detecting means for detecting the temperature of the magnetic display sheet 2 passing through the position sensor 34. The temperature sensor 40 detects the temperature of the magnetic display sheet 2 and generates a detection signal S1 representing the temperature. This detection signal S1 is output from the amplifier 4 of the control device 20.
2 is amplified by the amplifier 42 and the detection signal S1 amplified by the amplifier 42 is analog data.
D) After being converted to a digital value by the converter 44, the I / O
28.

A heating means is provided for heating the magnetic display sheet 2 having passed through the temperature sensor 40 under certain conditions. In this embodiment, a heating roller 46 is provided in the heating means. The heating roller 46 has a heater embedded in an inner surface of a roller formed of an elastic material,
The roller surface is heated uniformly, and rotates together with the transport rollers 6 and 8 to heat the magnetic display sheet 2 being transferred.

The heating roller 46 has a temperature sensor 4 as a second temperature detecting means for detecting its surface temperature.
8 are installed. The temperature sensor 48 detects the surface temperature of the roller surface of the heating roller 46 that comes into contact with the magnetic display sheet 2, and generates a detection signal S2 indicating the temperature.
The detection signal S2 is amplified by the amplifier 45 of the control device 20. Since the detection signal S2 amplified by the amplifier 45 is analog data, analog-digital (A / D) conversion is used as a means for converting it into a digital value. After being converted into a digital value by the unit 44, the digital value is applied to the I / O 28.

An erasing head 50 is provided as means for erasing the magnetic display on the magnetic display sheet 2 to be printed. The erasing head 50 is constituted by a permanent magnet or an electromagnet.

The magnetic display sheet 2 that has passed through the erasing head 50 is guided to a printing head 52 as printing means.
The print head 52 is installed within the interval between the position sensors 36 and 38, and the interval between the position sensors 36 and 38 represents a printing operation area. When the magnetic display sheet 2 passes through this area, the printing operation is performed. Do. The print head 52 is supplied with a drive output of a print head drive circuit 54, and the print head drive circuit 54 is supplied with a drive signal S3 according to print data from the I / O 28. The print head drive circuit 54 is means for supplying a magnetizing current as a recording current to the print head 52 by the drive signal S3. The print head drive circuit 54 is connected to an energization width setting circuit 55 that changes the energization width according to the detected temperature as a drive condition of the print head 52 set by the CPU 26.

The control device 20 is a control means for performing various controls such as a print control and a conveyance control for the magnetic display sheet 2, and includes a central processing unit (CPU) 26 which is an arithmetic control means. A ROM 56 and a RAM 58, an input / output unit (I / O) 28, an interface 60, and the like are provided as storage means. In ROM56,
Various control programs such as print control and transport control and drive signal data of the print head 52 are stored. RAM5
8, various data such as detected temperature data and rotation detection data are sequentially stored, and print data is developed. As the storage means, a floppy disk or the like can be used as an external storage device. The interface 60 is means for transmitting and receiving data such as a print command from a host device such as a host computer.

FIG. 2 shows an example of a specific circuit configuration of the print head drive circuit 54. The print head drive circuit 54 includes an address decoder 64 together with a plurality of data latch circuits 61. Print data DATA is added to the data latch circuits 61 and 62,
The address decoder 64 has an address ADDR,
Write pulse WRP generated by CPU 26 is given,
The configuration is such that a valid decoding result is output only when the CPU 26 writes the print data in the data latch circuits 61... The output is applied to data latch circuits 61...
Reference numeral 6 can arbitrarily write print data into each of the data latch circuits 61 and 62. Data latch circuit 61,
A plurality of AND circuits 71, 72... 7N corresponding to the number of dots are provided on the output side of 62. Each AND circuit 7
7N take the logical product of the outputs of the data latch circuits 61 and 62 and the drive signal S3, the bit corresponding to the print data is a black dot (high level), and the conduction width signal is in the active state ( Only during the period of “high level”.
7N are applied to the bases of drive transistors 81, 82... 8N via a current limiting resistor 80. .. 8N
.. 52N provided for each dot of the print head 52, and the other end of each coil 521, 522... 52N is connected to a printing power supply VH. ing. The emitters of the driving transistors 81, 82... 8N are grounded and held at the ground level.

With the above configuration, the print head drive circuit 5
According to No. 4, one or more of the driving transistors 81, 82... 8N corresponding to when the print data is a black dot (high level) and the conduction width signal S4 is in an active state (high level) are selected. The print head 52 is made conductive for a certain period of time.
., 52N, and a printing current is applied to print on the magnetic display sheet 2 in accordance with the printing data.

FIG. 3 shows a specific circuit configuration example of the conduction width setting circuit 55. This conduction width setting circuit 55
The result of converting the energization time data generated by the CPU 26 into the number of pulses CLK having a known pulse width (frequency) together with the counter 90 capable of counting from O to CMAX and the data held by the energization time setting latch circuit 92 A coincidence detector 94 for detecting coincidence is provided. The counter 90 has a pulse CL of a known pulse width (frequency).
Given K, counting this pulse CLK will measure the time.

The current width setting circuit 55 has a current width output section 96. The power supply width output section 96 generates a power supply signal HDON in response to the power supply start signal HDE. That is, the resistor 9 is used as an integrating means of the energization start signal HDE.
8 and a capacitor 100 are provided.
Is applied to an AND circuit 104 through a NOT circuit 102. This AND circuit 104 includes:
The energization start signal HDE is applied, and the NOT circuit 10
The logical product with the output of 2 is taken. This AND circuit 104
Is applied to the set input S of the RS flip-flop circuit 106, and the match output MATCH of the match detector 94 is applied to the RS flip-flop circuit 106 as the reset input R. The output Q of the RS flip-flop circuit 106 and the energization start signal HDE are ANDed by the AND circuit 108, and the output is output as the energization signal HDON. This energization signal HDON is
AND circuits 71, 72,... Of the print head drive circuit 54
7N, and sets the energization section of the coils 521, 522,... 52N.

The power supply width setting circuit 55 configured as described above
The operation of is described below.
The energization width data satisfying A ≦ CMAX is the write pulse WRP
The energization time setting latch circuit 92 holds data TDATA. The energization start signal is set to an inactive state (low level) by the initial operation of the CPU 26. The counter 90 has
The pulse CLK is applied, and the output (count value) of the counter 90 is output cyclically from 0 to CMAX. As a result, the pulse T of the clock pulse CLK shown in FIG.
In the sections 8 and 9, the match signal MATCH shown in FIG. 4B is output, but as shown in FIG.
Since the DE is inactive, the conduction width signal S4 is not output. When the energization start signal HDE becomes active at the time of the pulse T13, the output of the CR integrator which forms a delay circuit composed of the resistor 98 and the capacitor 100, that is, D in FIG.
As shown in (5), the voltage of the output 102I of the NOT circuit 102 gradually increases and becomes substantially saturated at the time of the pulse T16. At this time, the high level is maintained until the threshold value of the NOT circuit 102 is exceeded. Therefore, as shown in FIG. 4E, the output of the AND circuit 104 is at a high level during the pulse T13. That is, the resistor 98 and the capacitor 10
0, the NOT circuit 102, and the AND circuit 104 constitute a one-shot pulse circuit for detecting the rise of the energization start signal HDE. At the same time when the rising signal 90R is output, the counter 90 is reset, and the count value becomes 0.
Is cleared. Further, the pulse indicated by F in FIG. 4 becomes the S input, the flip-flop circuit 106 is set, and the output signal 106Q of the flip-flop circuit 106 is
As shown by G in FIG. At the same time, when the count value reaches TDATA at the time when the energization width signal S4 also becomes active (high level), that is, at the time T26 when the counter 90 starts counting from 0, the match detection signal MATCH of the match detector 94 changes. Output to the flip-flop circuit 106
Is reset. As a result, the output signal 106Q of the flip-flop circuit 106 returns to a low level, and the conduction width signal S4 also becomes inactive (low level). In this way, the conduction width setting circuit 55, as shown in FIG.
Energization width data TDA starting from the rise of energization start signal
The power supply width signal S4 of the pulse set by TA can be output.

A printing method based on the above configuration will be described with reference to flowcharts shown in FIGS. FIG.
In the flowchart shown in FIG. 6 and FIG. 6, a indicates a connector.

When the power is turned on, the CPU 26 is reset, performs a predetermined initialization process, and waits for a command from a higher-level device connected to the interface 60. When a print command is issued from the host device, the program branches to a print processing routine F1. In the print processing routine F1, it is first determined in step F101 whether a card to be printed is inserted in the apparatus. If a card is not inserted (No), the process proceeds to step F101 and the card 3 is inserted. The above-described processing is repeated until the processing is completed. If the card 3 has been inserted (Yes), the process proceeds to step F102.

In step F102, the magnetic display sheet 2
Is read from the A / D converter 44 and the process proceeds to step F103. In step F103, the detected temperature data of the magnetic display sheet 2 obtained in step F102,
A predetermined value TLOW, which is a predetermined temperature as a reference for determining whether or not to heat, is compared. If the temperature of the magnetic display sheet 2 is less than the specified value (Yes), step F104
Then, the use start routine F2 of the heating roller 46 is called, the heating roller 46 is maintained at the specified temperature TROL, and the process shifts to Step F105.

In step F105, step F102
Based on the detected temperature data of the magnetic display sheet 2 obtained in the above, the optimum energization width data is obtained by referring to the energization width table when the heating roller 46 is used, and step F10
Move to 8.

If it is determined in step F103 that the temperature of the magnetic display sheet 2 is equal to or higher than the specified value TLOW (No), the process proceeds to step F106. In Step F106, the use of the heating roller 46 is stopped. That is, the heater of the heating roller 46 is turned off, and the process proceeds to Step F107.

In Step F107, Step F102
If the heating roller 46 is not used on the basis of the temperature data obtained in the step F, the optimum energizing width when the heating roller 46 is not used is determined by referring to the energizing width table, and step F108
Move to

In step F108, the energization width data obtained in step F105 or F107 is written in the energization width setting circuit 55, and the flow advances to step F109. In step F109, the transport motor 14 is driven, and the card 3
Is transported in the direction indicated by arrow A in FIG. Before the card 3 is conveyed in the direction of arrow A and reaches the print head 52, the card 3 passes through the erasing head 50 and the image data is erased by the erasing head 50. The process of step F109 ends, and the process proceeds to step F110.

In step F110, it is determined whether or not the card 3 has reached the printing position. If the card 3 has not reached the printing position, the flow branches to step F110 to continue until the card 3 reaches the printing position. The above process is repeated.

If it is determined in step F110 that the card 3 has reached the printing position (Yes), as shown in FIG.
Proceeding to step F111, the print data of the first column is written in the print head drive circuit 54, and then proceeding to step F112. In step F112, the energization start signal HDE is set to a high level, and the process proceeds to step F113. Step F1
In step 13, it is determined whether or not the next dot position has been reached. If it is determined that the dot position has not been reached (No), step F1 is executed.
Branching to 13, the above operation is repeated until the card 3 reaches the next dot position.

If it is determined in step F113 that the card 3 has reached the next position (Yes), step F114
Then, the energization start signal is temporarily reset to a low level. This is because the energization width signal S4 is output at the rise of the energization start signal.

When the process of step F114 is completed, the process proceeds to step F115, where the print data of the corresponding column is written in the print head drive circuit 54, and the process proceeds to step F116. In Step F116, the energization start signal HDE is set to a high level, and the process proceeds to Step F117. In step F117, it is determined whether or not all print data has been printed. If there is unprinted data (No), the flow branches to step F113 to repeat steps F113 to F113 until all print data is printed. The processing up to step F117 is repeated.

If it is determined in step F117 that the printing of all the print data has been completed (Yes), the process proceeds to step F11.
Proceeding to S8, the energization start signal is reset to a low level, and the process proceeds to step F119. In step F119, the card 3 in the apparatus is ejected, and the process proceeds to step F120.

In step F120, it is determined whether the power saving mode is set. If it is determined that the power saving mode is set (Yes), the process proceeds to step F121, in which the use of the heating roller 46 is stopped, that is, the power supply to the heater is stopped. If it is determined that the power saving mode is not set (No), the print processing routine F1 ends without performing the processing of step F121. That is, when the power saving mode is not set and the temperature of the card 3 printed this time is lower than the specified value TLOW, control is performed so as to maintain the temperature of the heating roller 46 in preparation for printing of the next card 3. When the power saving mode is designated, the power supply to the heater of the heating roller 46 is cut off almost simultaneously with the end of printing, and the power consumption is controlled to be suppressed.

Next, a method of controlling the temperature of the heating roller 46 will be described with reference to FIG. When the use start routine F2 of the heating roller 46 is called, the execution is started from Step F201. In step F201, the temperature of the roller surface of the heating roller 46 is read from the A / D converter 44, and the process proceeds to step F202. In step F202, it is determined whether or not the detected temperature of the roller surface obtained in step F201 has reached a specified temperature TROL.
When it is determined that the ROL has been reached (Yes), the process proceeds to step F203. In Step F203, the heating roller 4
The power supply to the heater 6 is stopped, and the use start routine F2 of the heating roller 46 ends.

If it is determined in step F202 that the temperature of the roller surface is equal to or less than the specified value TROL (No), the flow branches to step F204. In Step F204, the heater of the heating roller 46 is energized, and the process branches to Step F202. This process is repeated until the roller surface temperature of the heating roller 46 exceeds the specified value TROL. Thus, the roller surface temperature of the heating roller 46 is kept constant.

Next, the printing optimization operation will be described. FIG. 8 shows a relationship between viscosity and temperature of general oil used for a suspension in microcapsules in the magnetic display sheet 2. In the viscosity curve L, the viscosity exhibits a remarkable change with respect to a temperature change from −20 ° C. to room temperature. For example, the viscosity at 15 ° C. is about 5.5 times lower than the viscosity at −10 ° C. Is changing. Obviously, the viscosity changes depending on the use environment temperature, which affects the driving of the sensitive magnetic piece.

Therefore, in this embodiment, as shown in FIG. 9, the magnetic display sheet 2 is heated when the temperature of the magnetic display sheet 2 is lower than a predetermined temperature, corresponding to the detected temperature data of the magnetic display sheet 2. When the temperature of the magnetic display sheet 2 is equal to or higher than a predetermined temperature, the drive energy corresponding to the temperature of the magnetic display sheet 2 is given to the print head 52 by changing the energizing width of the print head 52 in a stepwise manner. The drive is optimized. In FIG. 9, a curve L indicated by a broken line corresponds to the viscosity curve of FIG. 8, and the width of the current corresponds to the viscosity of the oil as the suspension. In this case, the relationship between the conduction width and the temperature t is a step value because the detected temperature is digitized by the A / D converter 44 and obtained by referring to the table of the ROM 56. Since the relationship between the temperature t and the viscosity is a non-linear characteristic as shown in FIG. 7, the energization width corresponding to this is also set to a non-linear step value.

In the embodiment, the case where the driving condition of the print head 52 is controlled by the power supply width (power supply time) has been described. However, the present invention is not limited to such control of the power supply width. For example, the driving conditions may be changed by changing the printing voltage VH applied to the magnetic head 52.

Further, in the embodiment, the example in which the heating roller 46 is used as the heating means of the magnetic display sheet 2 has been described. Specifically, various types of heaters such as a sheet heater, a warm air heater, an infrared lamp, and an electromagnetic heater are used. Heat source as heating means
Can be.

The heating control device for the heating roller 46 is as follows.
A description has been given of a combination of the temperature sensor 40, the A / D converter 44, and the CPU 26. However, the heating control is not limited to such a combination. May be used, and if such a heater is used,
The configuration of the control device can be simplified.

[0048]

As described above, according to the present invention,
The following effects are obtained. a. The temperature of the magnetic display sheet is detected, and if the detected temperature is lower than the predetermined temperature, the magnetic display sheet is heated and the detection is performed.
When the output temperature is equal to or higher than a predetermined temperature, the driving conditions of the print head are changed in accordance with the temperature so that the lower the detected temperature, the more the magnetic recording medium is driven.
Runode set or controlled so Nerugi increases, without being affected by the temperature of the magnetic display sheet, in a wide temperature range, can drive the print head at the optimum driving energy, stable printing is realized at a high printing quality it can. b. As long as the temperature of the magnetic display sheet does not drop below a predetermined temperature, the driving conditions of the print head are changed as the detected temperature becomes lower.
Only by setting or controlling such that the magnetic energy is increased , the printing quality at low temperatures can be improved, and the power consumption can be reduced as compared with the case of always heating.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic display sheet printing method and apparatus according to the present invention.

FIG. 2 is a circuit diagram illustrating a specific circuit configuration example of a print head drive circuit.

FIG. 3 is a circuit diagram showing a specific example of a circuit configuration of a conduction width setting circuit.

FIG. 4 is a timing chart showing an operation of a conduction width setting circuit.

FIG. 5 is a flowchart illustrating a method for printing a magnetic display sheet.

FIG. 6 is a flowchart illustrating a method for printing a magnetic display sheet.

FIG. 7 is a flowchart illustrating heating control of a heating roller.

FIG. 8 is a graph showing a viscosity curve of oil used in a magnetic display sheet with respect to temperature.

FIG. 9 is a graph showing the width of a print head energization with respect to temperature.

[Explanation of symbols]

 2 Magnetic display sheet 20 Control device (control means) 40 Temperature sensor (temperature detecting means) 46 Heating roller (heating means) 52 Print head

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G09F 9/37 B42D 15/10 501 G06K 1/12 B41J 2/385

Claims (4)

(57) [Claims] 1. A method for printing a magnetic display sheet for performing magnetic display by a magnetic field effect, comprising detecting a temperature of a magnetic display sheet to be printed, and detecting the temperature if the detected temperature is lower than a predetermined temperature. When the detected temperature is equal to or higher than a predetermined temperature, the driving condition of the print head for generating a magnetic field for performing magnetic display on the magnetic display sheet is set such that the lower the detected temperature , the lower the magnetic energy.
A method for printing a magnetic display sheet, wherein the method is set so that lugi is increased . 2. The driving condition of the print head, wherein the driving condition
2. The printing method for a magnetic display sheet according to claim 1, wherein the current width is set to be larger as the temperature becomes lower . 3. The driving condition of the print head includes the detection condition.
2. The method for printing a magnetic display sheet according to claim 1, wherein the applied voltage is set higher as the temperature becomes lower . 4. A printing device for a magnetic display sheet for performing a magnetic display by a magnetic field effect, comprising: a print head for generating a magnetic field for performing a magnetic display on the magnetic display sheet; and a temperature of the magnetic display sheet to be printed. Temperature detecting means for detecting the temperature, heating means for heating the magnetic display sheet, when the temperature detected by the temperature detecting means is less than a predetermined temperature, heating the magnetic display sheet by the heating means, When the temperature detected by the temperature detecting means is equal to or higher than a predetermined temperature, the driving condition of the print head is set such that the lower the detected temperature, the larger the magnetic energy
A magnetic display sheet printing apparatus, comprising: control means for performing control as described above .