JPH1069242A - Electronic information display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic information display device capable of displaying a high quality still image over a long period while prolonging service life of a magnetic display sheet. SOLUTION: Whether or not a use surface flag US=A is judged in a step e1, and when an A surface is used, the step is moved to the step e2, and an absolute value of a difference between respective count values of an A surface counter Ca and a B surface counter Cb is taken to be size compared with the number Pc of page switch sheets being a reference value. When the absolute value of the difference between respective count values is <10, the step is moved to the step e3, and for continuously using the presently using A surface, sheet transfer is performed to an A surface recording start position, and 1 is added to the A surface counter ca to be ended. On the other hand, when the absolute value of the difference between respective count values is >=10 in the step e2, the step is moved to the step 5, and for switching from the presently using A surface to a B surface, the sheet transfer is performed to a B surface recording start position, and after a use surface flag US=B is set in the step 6, 1 is added to the B surface counter Cb to be ended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic information display device for recording and displaying a still image on a display based on image information sent from an external host device.

[0002]

2. Description of the Related Art Conventionally, a magnetically responsive magnetic display sheet has been known as a display body which develops or erases color in response to the direction and strength of a magnetic field (for example, Japanese Patent Application Laid-Open No. 48-48).
56393, JP-A-2-146082).

[0003] Such a magnetic display sheet can draw simple characters and figures by contacting a magnet pen with a built-in magnet on the sheet surface, and can be reused many times by erasing. Has been put to practical use.

In recent years, an electronic information display device has been developed which records and displays a still image on a magnetic display sheet by a recording head forming a dot matrix magnetic field based on print information sent from an external host device. Is being done.
Since the electronic information display device can change the display content arbitrarily by remote control from an external host device, it can be installed at public facilities, stations, retail stores, etc. Can be widely announced and advertised. In addition, poster replacement work is not required, which contributes to resource saving of paper and the like, and is therefore expected to be a future bulletin board.

[0005]

In such an electronic information display device, since the recording head and the erasing head are arranged so as to be in contact with the magnetic display sheet,
If the sheet is repeatedly conveyed for a long period of time, the surface of the sheet is darkened due to friction between the sheet and the head, and fine scratches are increased, thereby deteriorating the sheet surface. Further, the reaction of the magnetic sheet is slowed down by countless rewriting operations over a long period of time, and the contrast is reduced.

Therefore, the magnetic display sheet needs to be replaced after a certain period of use, but the sheet itself is expensive.
In addition, since the replacement operation requires skill, maintenance costs are increased.

An object of the present invention is to provide an electronic information display device capable of displaying a high-quality still image for a long period of time while extending the replacement life of a magnetic display sheet.

[0008]

According to the present invention, there is provided an endlessly formed writable and erasable display body, a pair of support rollers for circulating and transporting the display body, and a supply from an external host device. Recording means for forming a still image on the display body, erasing means for erasing the still image formed on the display body, and dividing the display body into two parts in the circumferential direction based on the obtained image information. , One recording surface as surface A, the other recording surface as surface B,
An electronic information display device comprising: a use averaging unit for averaging the number of uses of the side A and the side B. According to the present invention, by averaging the number of uses of the recording surfaces A and B, which are recording surfaces obtained by dividing the display body into two in the circumferential direction, darkening, scratches, and sheet deterioration are concentrated only on a certain recording surface. Things can be avoided. Therefore, when the cumulative operation time of the apparatus increases, the degree of change over time on the side A and the side B becomes uniform, the image quality can be maintained over a long period, and the sheet replacement life can be extended.

Further, in the present invention, the use averaging means may include A
A detecting unit for detecting the number of continuous use of either one of the side and the side B, and a comparing unit for comparing the detected number of continuous use with a reference value, wherein the number of continuous use exceeds the reference value. In this case, the recording surface used continuously is switched to the other surface. According to the present invention, A side and B side
If the number of times of continuous use of any one of the sides is detected and the number of continuous uses exceeds the reference value, the number of times of use of the side A and the side B is switched by switching the continuously used recording surface to the other side. Can be dispersed over a long period of time.

In the present invention, the use averaging means may include a use surface flag indicating a currently used recording surface, an A surface counter for counting the cumulative use number of the A surface, and a cumulative number of use times for the B surface. B counter, and comparing means for comparing the absolute value of the difference between the count values of the A counter and the B counter with a reference value, and when the absolute value of the difference between the count values exceeds the reference value, The use surface flag is switched. According to the present invention, each of the cumulative use counts of the side A and the side B is counted, and when the absolute value of the difference between the two exceeds the reference value, the use side flag is switched to thereby use the side A and the side B. The number of times can be distributed over a long period.

According to the present invention, there is further provided a display body formed endlessly and capable of writing and erasing, a pair of support rollers for circulating and transporting the display body, and an image information supplied from an external host device. Recording means for forming a still image on the display, and erasing means for erasing the still image formed on the display.
An electronic information display device characterized in that one recording surface is designated as A surface and the other recording surface is designated as B surface, and A surface and B surface are used alternately. According to the present invention, the display body is moved in the circumferential direction by two.
By alternately using the divided recording surfaces A and B, it is possible to avoid a situation in which darkening, scratches, and sheet deterioration are concentrated on only a certain recording surface. Therefore, when the cumulative operation time of the apparatus increases, the degree of change over time on the side A and the side B becomes uniform, the image quality can be maintained over a long period, and the sheet replacement life can be extended.

[0012]

FIG. 1 is a side sectional view of an electronic information display device according to the present invention, and FIG. 2 is a partial perspective view thereof. A driven roller 50 is disposed on the inner upper portion of the housing 1, and a driving roller 60 is disposed on the inner lower portion. A flexible and endless magnetic member is provided between the two rollers 50 and 60. The display sheet 10 is suspended. Roller 5
Numeral 0 is urged upward by an elastic member (not shown) such as a spring, and applies a constant tension to the magnetic display sheet 10 to stabilize the running of the sheet and maintain the flatness of the sheet surface. The roller 60 is driven to rotate by a motor 63 via gears 61 and 62. By driving the roller 60, the magnetic display sheet 10 is moved from bottom to top on the front side of the housing 1 (left side in FIG. 1 and rear side in FIG. 2), and from the rear side of the housing 1 (right side in FIG. In FIG. 2 (front side), circulation is performed so as to transfer from top to bottom. A display window 2 made of a transparent material such as acrylic resin or glass is formed on the front surface of the housing 1.

The recording head 30 is installed below the rear transfer side of the magnetic display sheet 10 and, based on a print signal from an external host device (not shown), directs a dot matrix toward the surface of the magnetic display sheet 10. A recording magnetic field is generated. The recording head 30 has a plurality of electromagnetic coils arranged in a staggered manner, for example, and is mounted on a carriage 31 that reciprocates in the sheet width direction. The carriage 31 is 2
Endless belt 3 suspended between two pulleys 34, 35
3 and a motor 36 that drives the pulley 35 to rotate while being guided by the two guide shafts 32.
Driven by

The erasing head 20 is composed of a permanent magnet or the like having a length equal to or longer than the sheet width. The erasing head 20 is arranged above the front transfer side of the magnetic display sheet 10 and in close contact with the back side of the magnetic display sheet 10. I have.

As shown in FIG. 2, the magnetic display sheet 10 has two recording surfaces divided into two in the circumferential direction, one recording surface being an A surface, the other recording surface being a B surface, A light-transmitting reference hole MA is formed at the head position of the surface A, and a light-transmitting reference hole MB is formed at the head position of the surface B. The reference holes MA and MB are distinguished by the length in the circumferential direction, and the reference holes MA and MB are detected by the photo sensor PS.

Further, by arranging the recording head 30 and the erasing head 20 at a distance of substantially half of the entire length of the sheet in the sheet conveying path, printing on one recording surface (for example, A surface) is performed while the other is performed. Of the recording surface (for example, surface B) can be simultaneously performed.

FIG. 3 is a partial sectional view showing the structure of the magnetic display sheet 10. As shown in FIG. On the magnetic display sheet 10, microcapsules 15 that develop color in response to magnetism are applied and fixed over the entire surface. The microcapsule 15 is composed of a high-viscosity liquid and a spherical shell that holds the liquid tightly.
In this liquid, substantially black magnetic particles and substantially white non-magnetic particles are dispersed. For example, black iron oxide (FeO) particles having a particle size of 0.1 to 5 μm are used as magnetic particles, and white titanium oxide particles having a particle size of 0.1 to 5 μm are used as nonmagnetic particles. In addition, as the high-viscosity liquid, an aqueous liquid, an oil or fat, an organic solvent including a surfactant-based solvent or the like is used, and gelatin is mainly used as a material of the spherical shell. Distributed in a range.

The microcapsules 15 are kneaded with a binder 14 made of a highly transparent synthetic rubber-based adhesive or the like, and applied to a substrate 11 made of a transparent material such as polyethylene terephthalate.
A μm capsule coating layer 12 is formed.

On the back surface of the capsule coating layer 12, a protective sheet 13 made of, for example, a polypropylene long-fiber nonwoven fabric is adhered so as to have a thickness of, for example, 300 to 1000 μm.
Seat running is facilitated.

On the other hand, the recording head 30 has a box-shaped yoke 39 made of a high-permeability material, a magnetic core 37 made of a high-permeability material erected inside the yoke 39, and an electromagnetic core mounted on the magnetic core 37. And a plurality of magnetic cores 37 and electromagnetic coils 38 corresponding to the plurality of print dots. A number of voids are formed on the printing surface 39a of the yoke 39, and the leading end of the magnetic core 37 is positioned at the center of each void, and the leakage magnetic field is generated by the presence of the void between the magnetic core 37 and the void. Occurs.

When the electromagnetic coil 38 is selectively energized in response to a print signal, a magnetic field is generated along the axial direction of the magnetic core 37, and passes through a magnetic circuit composed of the magnetic core 37, a gap and a yoke 39. , A recording magnetic field is generated toward the magnetic display sheet 10.

Next, the principle of magnetic recording / display and erasure will be described. When the recording head 30 is brought close to the surface of the magnetic display sheet 10 where the substrate 11 is located, and a recording magnetic field is generated based on a print signal, the magnetic particles dispersed in the microcapsules 15 are attracted to the substrate 11 and the pressure is reduced. Thereby, the non-magnetic particles move to the protective sheet 13 side.
Then, when viewed from the front side of the magnetic display sheet 10, the portion to which the recording magnetic field is applied is observed to have a substantially black color. By applying the magnetic field in a dot matrix using the recording head 30, characters and symbols can be displayed. Can be recorded.

Next, when the erasing head 20 is brought close to the back side of the magnetic display sheet 10, that is, the side where the protective sheet 13 is located, the magnetic particles dispersed in the microcapsules 15 are attracted to the protective sheet 13 side, and the pressure is reduced. As a result, the non-magnetic particles move toward the base 11. Then, when viewed from the front side of the magnetic display sheet 10, the portion to which the erasing magnetic field is applied becomes substantially white, and the erasing magnetic field is uniformly erased by applying the erasing magnetic field to the entire sheet width.

As the above-mentioned high-viscosity liquid in the microcapsule 15, a liquid having a predetermined viscosity is selected in order to maintain a display state of the magnetic particles moved to the back side or the front side by applying a magnetic field. That is, if the viscosity of the liquid is low, the display state is prevented from being disturbed by the particles that have once moved to the front side or the back side settling or moving due to vibration or the like. Therefore, the above-described recording head 3
The magnetic attraction force in the zero and erasing heads 20 needs to be greater than the yield value due to the viscosity of the liquid, and thereby writing and erasing of a display are performed.

Next, the operation of the entire apparatus will be described. Referring to FIGS. 1 and 2, first, before printing is started, the magnetic display sheet 10 is circulated at a constant speed and the erase head 20 is rotated.
To erase the entire surface. As described above, by passing the print surface of the display sheet 10 continuously through the erasing head 20 once, the activity of the magnetic particles and the non-magnetic particles in the microcapsules 15 of the display sheet 10 is increased, and printing with good contrast becomes possible. . Next, a print signal is received from an external host device, and each time the development of image data for one print line is completed, the recording head 30 is moved for several milliseconds to several hundred milliseconds while moving in the sheet width direction. The magnetic printing is performed by applying the pulse current described above and applying a dot matrix magnetic field to the surface of the magnetic display sheet 10.

When printing for one line is completed, the magnetic display sheet 10 is moved by a predetermined feed pitch and stopped, and then printing is performed based on the image data developed for the next printing line. Thus, the development of the image data, the recording head 30
While repeating the serial printing and the intermittent feeding of the magnetic display sheet 10, one image is formed on, for example, the A side, and then the sheet is rapidly fed to a position corresponding to the display window 2.

Next, when a new image is printed, it is preferable that the printing surface is continuously passed through the erasing head 20 to increase the activity. Therefore, as described above, the magnetic display sheet 10 is moved at a constant speed. After the entire surface is erased by the erasing head 20 in a circulating manner, the cue of the side A is performed, and then serial printing is performed by the recording head 30. When recording and displaying is performed by circulating the magnetic display sheet 10 in this manner, the shortest cycle is to use one of the two recording surfaces continuously.

FIG. 4 is a block diagram showing the electrical configuration of the electronic information display device according to the present invention. The electronic information display device includes a CPU (central processing unit) 71 for controlling the operation of the entire device according to a predetermined program, a clock circuit 72 for generating a clock for determining the operation timing, and a timer circuit 73 for measuring the elapsed time. As shown in FIG. 10C, a clock circuit 91 for measuring today's date, day of the week, and current time, an operation panel 75 including various switches and display LEDs (light emitting diodes), and an operation panel 75 are connected. (I / O) circuit 74 for storing programs and EPROM (Electrically) for storing programs and data.
Programmable Read Only Memory (76) and an EEPROM (Erasable Elec) for storing data in a rewritable manner.
communication between an external device and a system control circuit 78 for managing related control such as display time management and initial operation control at power-on, etc. Interface circuit 80 and an interface (I / F) control circuit 79 for controlling the interface circuit 80
A motor control circuit 83 for controlling the number of rotations and the direction of rotation of the motors 36 and 63; a head control circuit 84 for controlling the operation of the recording head 30; and a RAM (Random) for temporarily storing various data such as print data. Access Memory) 85
A memory control circuit 86 for controlling a use area of each of the memories 76, 77, 85; a driver circuit 88 for driving the motors 36, 63 and the recording head 30;
8 and a bus 70 for interconnecting the circuits.

The interface circuit 80 is a facsimile modem (facsimile modem) for transmitting / receiving a signal to / from another facsimile apparatus via a transmission line such as a telephone line.
81 and a serial communication circuit 82 for transmitting and receiving signals to and from another computer in accordance with a communication standard such as RS232C.
And

The alarm circuit 90 includes, for example, a sound source such as a buzzer, a chime, and a speaker, and a light source such as a lamp and a light emitting diode, and is connected to the input / output circuit 74.

FIGS. 5 to 9 are flowcharts showing the operation. First, in step a1 of FIG.
Are EPROM 76 and EEPROM as shown in FIG.
Extracts various initial data stored in M77 in advance and sets RA
Initialize to M85. Here, the total page number P is stored in the RAM 85
Is the number of pages of the image that can be stored in the page memory, and the initial value is “8”. The timer value T is the time when the timer circuit 73 measures the timer interrupt and generates a timer interrupt. The initial value is “0” which means that the timer interrupt is generated immediately after the power is turned on. Page switching number Pc
Is the number of sheets for which the continuous use of the side A and the side B is periodically switched, and the initial value is “10”.

Next, in step a2, it is determined whether or not there is an incoming fax. If there is no incoming fax, the process proceeds to step a4, and it is determined whether or not there is a timer interrupt for determining the timing of switching the current display image to the next image. If there is no timer interrupt, the process returns to step a2, and waits in a loop until a facsimile incoming call of step a2 or a timer interrupt of step a4 occurs.

When a facsimile call is received in step a2,
At step a3, a data processing routine is executed. Also,
When a timer interrupt occurs in step a4, an interrupt processing routine is executed in step a5.

FIG. 6 is a flowchart showing a data processing routine of step a3. First, in step b1, the FAX modem 81 starts receiving FAX data, determines in step b2 whether or not reception of image data of one page has been completed, and performs scanning in step b3 until reception of image data has been completed. Receiving data line by line, step b
In step 4, the received data is stored in the input buffer set in the RAM 85. When the reception of the image data for one page is completed, the process proceeds to step b5, where the facsimile reception is terminated and the line is disconnected, and then the image data stored in the input buffer is displayed on the display memory corresponding to the predetermined page in the page memory. Save to storage area. When the data processing routine of FIG. 6 ends, the process returns to step a4 of FIG.

FIG. 7 is a flowchart showing the interrupt processing routine of step a5. When the timer circuit 73 generates an interrupt, the page number (designated page number) N currently being displayed is read in step c1 and set to the display number L. In the non-display state, the designated page number N is 0. Next, at step c2, the display number L is incremented by one. Next, at step c3, when the display number L exceeds the total number of pages P, when an interrupt occurs in the non-display state, at step c5, the image is displayed. In step c4, the display number L is set to 0 so that the search can be stopped, and if an interrupt occurs in the image display state, the presence or absence of the image of the first page can be searched.

Next, at step c5, L = N is determined, and
When the search for the image to be displayed next has completed one cycle, the search is stopped and an image display stop process is performed when the image data to be displayed is not in the display image storage area. In step c9, the interrupt timer is set in preparation for the next display. After a reset, it has restarted. If there is no image data in the display image storage area corresponding to the display number L in step c6, the process returns to step c2 for displaying the next image.

If image data corresponding to the display number L exists in step c6, the display number L is set to the designated page number N in step c7, and the display processing of the image data corresponding to the designated page number N is performed in step c8. Execute At this time, the designated page number N is also written in the EEPROM 77 and used as an initial setting value at the next power-on.

FIG. 8 is a flowchart showing a display processing routine of step c8. First, at the start of the routine, the alarm circuit 90 is operated, and for example, a rewrite display lamp is turned on to call attention to a pedestrian.
In step 1, a page management processing routine for managing which of the two recording surfaces, the A side and the B side, is to be used, and the use side flag US is set as a return value of this routine.
US = A is set when the surface is used, and US = B is set when the surface B is used.

Next, in step d2, the image data corresponding to the designated page number N is read into the print buffer set in the RAM 85, and in step d3, while the magnetic display sheet 10 is being conveyed, the recording head 30 converts the image data into the print buffer. Magnetic recording is performed based on this. In step d4, it is determined whether or not the recording operation for one page has been completed. When the recording operation has been completed, the magnetic display sheet 10 is transported to the display area corresponding to the display window 2 in step d5.

Next, after the rewriting display lamp is turned off in step d6, the display time of the image data corresponding to the designated page number N, that is, the timer designated time is read from the RAM 85, and this display time is read in the timer circuit 7 in step d7.
Set to 3 to set the time until the next timer interrupt, and start the timer operation of the timer circuit 73 in step d8. The current image display is continued until the next timer interrupt occurs, that is, until the display time set in the timer circuit 73 has elapsed.

FIG. 9 is a flowchart showing the page management processing routine of step d1. First, step e1
, A used surface flag US indicating the currently used recording surface
= A or not, and if surface A is in use, step e2
Then, the value of the A-side counter Ca for counting the cumulative use count of the A-side is compared with the value of the B-side counter Cb for counting the cumulative use count of the B-side. Note that the values of the A-side counter Ca and the B-side counter Cb are EEPR as shown in FIG.
It is stored in OM77.

Therefore, the absolute value of the difference between the count values of the A-side counter Ca and the B-side counter Cb is calculated, and compared with the reference number of page-switching pages Pc (set value is 10). If the absolute value of the difference between the count values is less than 10, the process proceeds to step e3 to continue using the currently used surface A, so that the reference hole MA shown in FIG. 2 is detected by the photosensor PS. The sheet is conveyed to the position, that is, the recording start position of the A side of the magnetic display sheet 10. Next, step e4
Then, 1 is added to the A-side counter Ca, and the page management processing routine ends.

On the other hand, in step e2, if the absolute value of the difference between the count values is 10 or more, the process proceeds to step e5 to switch from the currently used surface A to the surface B, so that the reference hole shown in FIG. The sheet is conveyed to a position where the MB is detected by the photosensor PS, that is, a recording start position on the B side of the magnetic display sheet 10. Next, in step e6, the used surface flag US = B is set, and in step e7, 1 is added to the B surface counter Cb, and the page management processing routine ends.

Conversely, in step e1, when the used surface flag US = B, that is, the currently used recording surface is B
Similarly, in the case of the surface, whether to continue using the surface B or switch to the surface A is determined by the count value of each counter. In step e8, the absolute value of the difference between the count values of the A-side counter Ca and the B-side counter Cb is calculated, and
The size is compared with the page switching number Pc (the set value is 10) which is the reference value. If the absolute value of the difference between the count values is less than 10, the process proceeds to step e9, and the reference hole MB shown in FIG. 2 is detected by the photosensor PS in order to continue using the currently used surface B. The sheet is conveyed to the position, that is, the recording start position of the B side of the magnetic display sheet 10. Next, at step e10, 1 is added to the B-side counter Cb, and the page management processing routine ends.

On the other hand, if the absolute value of the difference between the count values is 10 or more in step e8, the process proceeds to step e11 to switch from the currently used surface B to the surface A.
The sheet is conveyed to a position where the reference hole MA shown in FIG. Next, after setting the used surface flag US = A in step e12, 1 is added to the A surface counter Ca in step e13, and the page management processing routine ends.

Incidentally, the used surface flag US, the A surface counter C
The a and B side counters Cb are stored in a nonvolatile manner in the EEPROM 77 and are reflected when the power is turned on next time.

As described above, it is advantageous to continuously use either the A side or the B side from the viewpoint of continuously erasing the printing surface to obtain a display image having high contrast and shortening the processing time. If the same recording surface is used continuously, the change over time in the sheet will be biased.
By switching the surface to be used at a cycle of about 0 sheets, the replacement life of the sheets can be extended. Note that by setting the page switching number Pc = 0, which is the reference value, it is also possible to set the side A and the side B to be used alternately.

FIG. 11 is a flowchart showing another example of the display processing routine of step c8. Here, A
The display counter Cd for counting the number of displayed images is used without distinguishing the surface B, and the initial value is set to, for example, “0”. First, at the start of the routine, the alarm circuit 90 is operated, for example, by turning on a rewrite display lamp to call attention to a pedestrian. In step f1, the page switching number Pc in which the count value of the display counter Cd is a reference value is set.
(Set value is 10) or more, it is determined whether or not the count value is less than 10;
The magnetic display sheet 10 is conveyed until the next reference hole of A and MB is detected, and the cueing of the same recording surface as the previous time is performed.

On the other hand, if the count value of the display counter Cd is 10 or more, the process proceeds to step f3, where the reference holes MA and MB are set.
Then, the next reference hole is skipped, the magnetic display sheet 10 is conveyed until the next reference hole is detected, and the cueing of the recording surface different from the previous one is performed. Next, at step f4, the display counter Cd is reset.

Next, in step f5, the image data corresponding to the designated page number N is read into the print buffer set in the RAM 85, and in step f6, the recording head 30 converts the image data in the print buffer while conveying the magnetic display sheet 10. Magnetic recording is performed based on this. In step f7, it is determined whether or not the recording operation for one page has been completed. When the operation is completed, the magnetic display sheet 10 is transported to the display area corresponding to the display window 2 in step f8.

In the next step f9, the count value of the display counter Cd is incremented by one, and after the rewriting display lamp is turned off in step f10, the display time of the image data corresponding to the specified page number N, that is, the timer specified time is set. RA
M85, the display time is set in the timer circuit 73 in step f11, and the time until the next timer interrupt is set. In step f12, the timer circuit 73 is set.
Start timing operation of. The current image display is continued until the next timer interrupt occurs, that is, until the display time set in the timer circuit 73 has elapsed.

As described above, the number of times the same recording surface is used continuously is counted, and the used surface is switched at a predetermined number of times, for example, about 10 sheets, so that the exchange life of the sheets can be extended. By setting the page switching number Pc = 1, which is the reference value, it is also possible to set to use the A side and the B side alternately.

[0053]

As described in detail above, according to the present invention, when the cumulative operation time of the apparatus is increased, the degree of change over time on the A and B surfaces becomes uniform, and the image quality is improved over a long period of time. Can be maintained and the life of replacing the sheet can be extended.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an electronic information display device according to the present invention.

FIG. 2 is a partial perspective view showing an electronic information display device according to the present invention.

FIG. 3 is a partial sectional view showing a structure of a magnetic display sheet 10.

FIG. 4 is a block diagram showing an electrical configuration of the electronic information display device according to the present invention.

FIG. 5 is a flowchart showing an operation.

FIG. 6 is a flowchart showing a data processing routine of step a3.

FIG. 7 is a flowchart showing an interrupt processing routine of step a5.

FIG. 8 is a flowchart showing a display processing routine of step c8.

FIG. 9 is a flowchart showing a page management processing routine of step d1.

10 is an example of a data format of setting information stored in an EPROM 76, an EEPROM 77, and a clock circuit 91. FIG.

FIG. 11 is a flowchart showing another example of the display processing routine of step c8.

[Explanation of symbols]

 Reference Signs List 1 housing 2 display window 10 magnetic display sheet 20 erasing head 30 recording head 31 carriage 36, 63 motor 50, 60 roller 71 CPU 73 timer circuit 74 input / output circuit 80 interface circuit 85 RAM MA, MB reference hole PS photo sensor

Claims (4)

[Claims] 1. A display body formed endlessly and capable of writing and erasing, a pair of support rollers for circulating and transporting the display body, and image information supplied from an external host device. Recording means for forming a still image on the display, erasing means for erasing the still image formed on the display, and dividing the display into two parts in the circumferential direction, wherein one of the recording surfaces is the A side. An electronic information display device comprising: a use recording means for averaging the number of uses of the A side and the B side; 2. The use averaging means, comprising: a detection means for detecting the number of continuous use of one of the side A and the side B; and a comparing means for comparing the detected number of continuous use with a reference value. Including, when the number of continuous use exceeds the reference value,
2. The electronic information display device according to claim 1, wherein the recording surface used continuously is switched to the other surface. 3. The use averaging means includes: a use surface flag indicating a recording surface currently in use; an A surface counter for counting the cumulative use number of the A surface; and a B counter for counting the cumulative use number of the B surface.
A counter for comparing the absolute value of the difference between the count values of the A-side counter and the B-side counter with a reference value, wherein when the absolute value of the difference between the count values exceeds the reference value, The electronic information display device according to claim 1, wherein the flag is switched. 4. A display body formed endlessly and capable of writing and erasing, a pair of support rollers for circulating and transporting the display body, and image information supplied from an external host device. Recording means for forming a still image on the display; and erasing means for erasing the still image formed on the display. The display is divided into two parts in the circumferential direction, and one recording surface is formed. An electronic information display device, wherein an A surface and the other recording surface are a B surface, and the A surface and the B surface are used alternately.