JPH0632095A - Electronic blackboard system - Google Patents

Abstract

PURPOSE:To provide an electronic blackboard in which an image immediately before erasing can be again written on a display medium and ink, dusts adhered to the medium can be erased. CONSTITUTION:The electronic blackboard system comprises cleaning means 28 having a blade 23 pressure contact with a hard layer of a display medium 1 to peel ink, dusts adhered by feeding the medium 1. Before an image is written on a heat sensitive colored layer of the medium 1 by automatic writing means 14, the ink, dusts are peeled by the means 28. Further, before the image is erased by the means 28 and automatically erasing means 22, the image to be erased is read and stored by optical reading means 33. The stored image can be written on the layer of the medium 1 by the means 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function as a blackboard (whiteboard) in which an image can be directly written by a human, and an image can be written and displayed without human intervention, and the displayed image can be erased. The present invention relates to an electronic blackboard system capable of optically reading an image on a display medium and printing it on a print medium such as paper.

[0002]

2. Description of the Related Art As a conventional electronic blackboard system, there is JP-A-64-34799 disclosed by the present applicant. This is because it is possible to write an image such as characters and figures on a large display medium equipped with an electronic blackboard device with a predetermined writing tool for handwriting, and erase it by wiping the written image with a cloth or the like. A hard layer and an automatic display layer capable of writing and erasing images by signals, and having a structure with multiple screens, this display medium is supported so that it can run, and image data is further displayed on this display medium. An automatic writing means such as a thermal head for automatically writing an image on the basis of a signal, and an erasing means such as a cooler or a heater for erasing the image written on the display medium by the automatic writing means are provided.

As its operation, when an image of a material is optically read by an external input device and is inputted to the electronic blackboard device as image data, the image data is stored in the storage section and transferred to the automatic writing means. A signal based on the image data is given to the automatic display layer of the display medium by the automatic writing means, and the image is automatically written on the display medium.

When a supplement or correction is added to this image, it is added with a writing tool such as a marker. Further, the image data in the storage unit is transferred to the printing unit, and the image is printed on the printing medium by the printing unit based on the image data. here,
When the retouched image is printed, the image is read by the optical reading unit and transferred as image data to the printing unit.

[0005]

However, in the above-described conventional electronic blackboard system, when the operator mistakenly erases the image of the display medium whose data is not stored in the storage unit, the external input is performed again. There is a problem that it takes time and effort to read and display the image of the material with the device and to add it with a writing instrument.

Further, the rewritten ink must be wiped by hand with a cloth or the like, and even if the ink is wiped with a cloth or the like, ink powder remains in the hard layer of the display medium, and in this state. When writing by the automatic writing means or erasing by the automatic erasing means, there is a problem that the ink powder remaining on the automatic writing means and the automatic erasing means adheres to deteriorate the quality.

The present invention has been made in order to solve such a problem, and an image just before being erased during an image erasing operation is read and stored by the optical system reading means, and stored as needed. An electronic blackboard system capable of rewriting the formed image on the display medium and erasing ink or dust adhering to the surface of the hard layer of the display medium by providing cleaning means before the automatic writing means and the automatic erasing means. The purpose is to provide.

[0008]

In order to achieve this object, the present invention provides an electronic blackboard device, an electronic blackboard device connected to the electronic blackboard device, image data output to the electronic blackboard device, and an image from the electronic blackboard device. At least 1 to enter data
Consisting of an external input / output device, the electronic blackboard device is capable of writing an image with a predetermined writing tool for handwriting, and a hard layer erasable by wiping the written image and a signal image by applying heat. A thermoreversible display medium having a writable and erasable thermosensitive coloring layer; a traveling means for traveling the display medium; an optical system reading means for optically reading an image written on the display medium; Storage means for storing the image data sent from the input / output device and the image data read by the optical system reading means;
Automatic writing means for writing a signal image on the thermosensitive coloring layer of the display medium by applying heat, automatic erasing means for erasing the signal image written on the thermosensitive coloring layer of the display medium by applying heat, and The hard layer is provided with a cleaning means for erasing an image written by a writing instrument for handwriting.

Then, after the cleaning means erases the image written on the hard layer of the display medium with a writing instrument for handwriting, the automatic writing means writes a signal image on the heat-sensitive coloring layer of the display medium on the erased surface. Means will be provided. Further, the image just before being erased by the cleaning means and the automatic erasing means is read by the optical system reading means, the erased image storage means for storing the image data, and the image data stored in the erased image storage means are automatically written. A control means for writing in the thermosensitive coloring layer of the display medium by means is provided.

Further, a printing means for printing the image data stored in the storage means and the erased image storage means on a print medium different from the display medium which is smaller than the screen of the display medium, and the printing means. An enlarging / reducing means for enlarging or reducing the image data printed on the print medium is provided. Further, enlargement / reduction means for enlarging or reducing the image data written on the display medium by the automatic writing means is provided.

[0011]

According to the present invention having the above-mentioned structure, when an image is written on the display medium by the automatic writing means, first, the image is written on the hard layer of the display medium by the cleaning means by the handwriting writing instrument or the hard layer of the display medium. After the attached dust is erased, an image is written on the erased surface by the automatic writing means on the thermosensitive coloring layer of the thermoreversible display medium.

When the image is erased by the cleaning means and the automatic erasing means, the image just before being erased by the cleaning means and the automatic erasing means is read by the optical system reading means, and the image data is stored in the erased image storing means. If necessary, the image data stored in the erased image storage means is written in the thermosensitive coloring layer of the display medium by the automatic writing means.

[0013]

Embodiments Embodiments will be described below with reference to the drawings. 1 is a perspective view showing an electronic blackboard device in an electronic blackboard system according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along the line ZZ of FIG. In the figure, 1 is an endless and thermoreversible display medium, 2 is a roller, 3 is a platen roller, and the roller 2 and the platen roller 3 are arranged in parallel, and the display medium 1 is the roller 2 and the platen roller 3. Is wrapped around. Reference numeral 4 denotes a pedestal arranged inside the display medium 1 between the roller 2 and the platen roller 3.

Reference numeral 5 denotes a gear arranged coaxially with the platen roller 3, reference numeral 6 denotes a motor gear meshing with the gear 5, and the motor gear 6 is fixed to a rotary shaft of a motor 7. When the motor 7 is driven, this driving force is transmitted from the motor gear 6 to the gear 5
Is transmitted to the platen roller 3 and the display medium 1 travels in the arrow A direction or the arrow B direction.

Reference numeral 8 denotes a platen roller 3 with the display medium 1 interposed therebetween.
The thermal head 9 is disposed opposite to the thermal head, and 9 is a head mounting plate to which the thermal head 8 is fixed. Reference numeral 9a denotes an axis that serves as the center of rotation of the head mounting plate 9, and has an axis parallel to the platen roller 3. Reference numeral 10 denotes a cam, and a tip portion 1 of the cam 10
0a contacts the protrusion 9b of the head mounting plate 9.

Reference numeral 10b designates a shaft which is the center of rotation of the cam 10, and 1
Reference numeral 0c is a gear portion formed on the cam 10 around the shaft 10b so that the shaft 10b is the center of rotation, 11 is a motor gear meshing with the gear portion 10c, 12 is a motor in which the motor gear 11 is fixed to the rotation shaft, and 13 is thermal. It is a compression coil spring that presses the head 8 against the platen roller 3, and the automatic writing means 14 is composed of these components.

FIG. 3 is a sectional arrow view showing the operation of the automatic writing means 14. With this configuration, when the motor 12 is driven to rotate the motor gear 11 in the direction of arrow a, the cam 10
Rotates about the shaft 10b in the direction of arrow c, and the tip 10a of the cam 10 pushes the protrusion 9b of the head mounting plate 9. As a result, the head mounting plate 9 rotates in the direction of arrow e around the shaft 9a against the compression coil spring 13, and the thermal head 8 separates from the platen roller 3. Here, the motor 12
The driving force is selected to be strong enough to overcome the spring energy of the compression coil spring 13.

From this state, when the motor 12 is driven in the opposite direction to rotate the motor gear 11 in the direction of arrow b, the cam 10 rotates in the direction of arrow d around the shaft 10b, and the cam 1
The tip portion 10a of 0 separates from the protrusion 9b of the head mounting plate 9. As a result, the spring energy stored in the compression coil spring 13 causes the head mounting plate 9 to rotate about the shaft 9a in the direction of arrow f, and the thermal head 8 is pressed against the platen roller 3.

Since the display medium 1 is sandwiched between the thermal head 8 and the platen roller 3, when the platen roller 3 is rotated by the motor 7 in the direction of arrow g, the display medium 1 is sequentially transferred to the receiving table 4 side. Then, the thermal head 8 can print at the same time. Here, as the thermoreversible display medium in the present embodiment, for example, the applicant of the present application, Japanese Patent Application Laid-Open No. 3-200935.
It is formed by providing a hard layer to the one disclosed in Japanese Patent Application No. 1-344064, and the display medium 1 will be described below.

FIG. 4 is a cross-sectional view of the display medium 1, the substrate 1
a, a thermosensitive coloring layer 1d including a coloring layer 1b and a recording layer 1c
And a hard layer 1e serving as the surface of the display medium 1. The hard layer 1e is composed of a transparent or semitransparent acrylic UV curing agent or a fluorine film so that the hard layer 1e can be written by a felt pen or the like and can be erased by a cleaning means described later.

FIG. 5 shows the hysteresis curve of the transparency change with respect to temperature of the thermoreversible display medium 1 having the above-mentioned structure, in which the ordinate represents the transmittance and the abscissa represents the temperature. Thus, the thermoreversible display medium 1 of the present embodiment
Was heated to a temperature within a range from 70 ° C. to 120 ° C. which is the melting point temperature of the trade name “Asmer (manufactured by Asahi Kasei Kogyo)” (an example of a styrene-butadiene copolymer contained in the recording layer 1c). In this case, the recording layer 1c becomes transparent and shows the color (here, red) of the colored layer 1b below the recording layer 1c. When the recording layer 1c is cooled to room temperature (about 25 ° C.) as it is, red color is visible. Leave.

Further, the thermoreversible display medium 1 of this embodiment is used.
When heated to a temperature in the range of 57 ° C. to 68 ° C., the recording layer 1c becomes opaque (that is, white) and the red color of the colored layer 1b becomes invisible, and it is opaque when cooled at room temperature. Fixed in state. Thereby, the thermoreversible display medium 1 of the example is heated to a temperature of 63 ° C., cooled to room temperature to form a white screen by the thermoreversible display medium 1, and then 70 ° C. to 120 ° C. When a predetermined portion of the white screen is heated and printed by the thermal head 8 heated to a temperature within the temperature range of ℃, the red color of the colored layer 1b is visible only in the printed portion and the other portions remain white, and the background An image having a white part and a red print part is obtained.

Further, when the thermoreversible display medium 1 is heated again to 63 ° C. by a heat roller described later after image formation, a white screen is obtained again. Thus, the thermoreversible display medium 1 used in this embodiment is obtained. The image forming and image erasing can be repeated, and the temperature for making the recording layer 1c transparent is as wide as 70 ° C. to 120 ° C., so that the image forming by the transparent recording method is easy.

Next, the automatic erasing means for erasing the image recorded by the application of heat as described above on the thermoreversible display medium 1 will be described. Reference numeral 15 is a heat roller arranged to face the front surface side of the display medium 1, and 16 is a heat roller 15.
Is a rotatably supporting heat roller, and the heat roller 15 has a shaft parallel to the platen roller 3 and is rotatable.

Reference numeral 16a denotes a shaft serving as a rotation center of the heat roller support 16, 17 denotes a plunger magnet for generating a driving force for rotating the heat roller support 16 in a direction in which the heat roller 15 moves away from the display medium 1, and 18 denotes a plunger magnet. It is a connecting rod that connects 17 and the heat roller support 16. Reference numeral 19 is a tension coil spring that rotates the heat roller support 16 in a direction in which the heat roller 15 is pressed against the display medium 1.

Reference numeral 20 is a rubber roller located inside the display medium 1 and opposed to the heat roller 15 with the display medium 1 interposed therebetween. Reference numeral 21 is hung between the upper end portion of the rubber roller 20 and the upper end portion of the platen roller 3. The automatic erasing means 22 is composed of these parts. FIG. 6 is a sectional arrow view showing the operation of the automatic erasing means 22. When the platen roller 3 is rotated by the drive of the motor 7, the driving force is transmitted to the rubber roller 20 via the belt 21, and the rubber roller 20 is rotated. Rotate in the same direction as 3. At this time, the diameter of each roller is set so that the circumferential speed of the rubber roller 20 is the same as the circumferential speed of the platen roller 3.

When the plunger magnet 17 is driven, the connecting rod 18 is pulled in the direction of arrow h, whereby the heat roller support 16 rotates in the direction of arrow i about the shaft 16a against the tension coil spring 19. Heat roller 1
5 is held at a position away from the display medium 1. When the driving of the plunger magnet 17 is stopped, the heat roller support 16 is pulled by the tension coil spring 19 and rotates in the direction of arrow j, and the heat roller 15 is pressed against the rubber roller 20 with the display medium 1 interposed therebetween.

In this state, when the platen roller 3 is rotated in the direction of arrow g, the rubber roller 20 is also rotated in the same direction,
The surface of the heat roller 15 is removed by a heating means (not shown).
If heated to 3 ° C., the heat-sensitive colored layer 1d of the display medium 1 sandwiched between the heat roller 15 and the rubber roller 20.
The image recorded in is returned to white and is erased.

Next, the cleaning means for erasing the ink image written on the surface of the hard layer 1e of the display medium 1 with a writing instrument such as a felt pen by peeling will be described. 23 is a plate-like cleaning blade made of rubber, plastic or the like and having elasticity, 23a and 23b are edge portions extending in the longitudinal direction at both ends in the short side direction of the blade 23, and 24 is the cleaning blade 23 attached by adhesion or the like. With the attached blade support plate, the cleaning blade 23 is attached so that both ends thereof are evenly protruded from the blade support plate 24 in the lateral direction.

Reference numerals 24a and 24b denote shafts serving as the center of rotation of the blade support plate 24, 24c denotes a gear portion formed on the blade support plate 24 around the shaft 24a so that the shaft 24a serves as the center of rotation, and 25 denotes a gear portion 24c. Motor gears that mesh with each other, 2
Reference numeral 6 denotes a motor having a motor gear 25 fixed to its rotary shaft. Reference numeral 24d denotes a sensor lever portion projectingly formed on the blade support plate 24, and 27 denotes a home sensor for detecting the sensor lever portion 24d.
Is configured. The cleaning means 28 is arranged between the automatic writing means 14 and the automatic erasing means 22.

FIG. 7 is a sectional view showing the operation of the cleaning means 28. When the motor 26 is driven, the driving force is transmitted from the motor gear 25 to the gear portion 24c, and the blade support plate 24 rotates. Here, as shown in FIG. 7A, the motor 26 is driven to move the blade support plate 24 to the shaft 24a,
When the edge 24a of the cleaning blade 23 is pressed against the hard layer 1e of the display medium 1 when it is rotated in the direction of arrow k about 24c, the display medium 1 is made to run in the direction of arrow A in this state, The ink image on the surface of the hard layer 1e of the medium 1 is the edge portion 2 of the cleaning blade 23.
It is peeled off by 3a. Further, as shown in FIG. 7B, the motor 26 is driven to move the blade support plate 24 to the shaft 24.
When the cleaning blade 23 is rotated about the a and 24c in the direction of arrow l, the other edge portion 23b of the cleaning blade 23 is pressed against the hard layer 1e of the display medium 1, and the display medium 1 is run in the direction of arrow B in this state. The ink image on the surface of the hard layer 1e of the display medium 1 is peeled off by the edge portion 23b of the cleaning blade 23. The sensor lever portion 24
By detecting d with the home sensor 27, the rotational position of the cleaning blade 23 can be detected.

Next, the optical system reading means for optically reading the image on the writing medium 1 will be described. 29 is an image sensor for optically reading the image on the display medium 1, 30 is a condenser lens for forming an image on the image sensor 29, 31 is a light source for irradiating the reading position on the display medium 1, and 32 is a light source 31. It is a mirror that guides the light that has been irradiated and reflected at the reading position of the display medium 1 to the condenser lens 30, and the optical system reading means 33 is configured from these respective components. The reading position of the optical system reading unit 33 is arranged between the automatic writing unit 14 and the cleaning unit 28.

FIG. 8 is a block diagram showing the control system of the electronic blackboard system according to this embodiment. In FIG. 8, the electronic blackboard device is formed by the structure surrounded by the alternate long and short dash line, and the others are external input / output devices. In the figure, 34
Is a control circuit for controlling the entire apparatus, and is constituted by a microprocessor or the like, and all circuits described later are connected to the control circuit 34.

The image processing unit 35 irradiates the reading position of the display medium 1 with the light source 31 and converts the reflected light reaching the image sensor 29 into an electric signal, and converts the electric signal into an analog signal by a predetermined method. After assembling and further amplifying this signal, the analog signal is converted into a digital signal and binarized. The motor / magnet drive unit 36 drives the motor 7, the motor 12, the motor 27, the plunger magnet 17, and the paper feed motor of the printer means described later.

The sensor driver receiver 37 drives the home sensor 27, receives the output waveform of the home sensor 27, and lights up the lighting unit 3.
Reference numeral 7 turns on and off the light source 31. Heater driver 38
Drives the heat roller 15 so as to maintain a constant temperature. The operation unit 39 has an instruction to write or erase an image on the display medium 1, an instruction to move the display medium 1, an instruction to copy an image on the display medium 1 to a printer unit described later, an image input from an external input / output device, or an external device. An image output instruction of the input / output device, a redisplay instruction of the erased image on the display medium 1, and the like can be input.

A printer means 40 is provided inside the electronic blackboard device of this embodiment, and the printer means 4 is provided.
Reference numeral 0 is composed of a thermal head 41, a platen roller 42 arranged to face the thermal head 41, a motor 43 for rotationally driving the platen roller 42, and a thermal paper 44 on which an image is printed by the thermal head 41.

Reference numeral 45 denotes an image scanner as an example of an external input / output device, which reads characters or paintings on a printed matter and converts them into electric signals, and the image data is interfaced (I
/ F) 46 to the electronic blackboard device. Four
7a is a facsimile machine (FA
In X), the characters or painting on the printed matter are read and converted into an electric signal, and this image data is sent to the electronic blackboard device via the telephone line and I / F 46, and the I / F 4 is sent from the electronic blackboard device.
6. The image data sent via the telephone line is printed on a medium.

Reference numeral 47b is a personal computer (personal computer) as an external input / output device, 48 is a memory device such as a floppy disk (FDD), a hard disk (HDD) and an optical disk which is a storage means of the external input / output device.
Reference numeral 49 denotes a printer device as an external input / output device, which is connected to the electronic blackboard device via the I / F 46, and each external input / output device transmits / receives image data to / from the electronic blackboard device. Is possible.

The selector 50 reads the image of the display medium 1 with the image sensor 29 and processes it with the image processing unit 35, and the image scanner 4 constituting the external input / output device.
5, FAX47a, personal computer 47b, the data which is obtained from memory device 48 via I / F46 is selected and memory 51 is selected.
Send to. Then, the memory 51 stores the data sent via the selector 50.

Then, according to the image data stored in the memory 51, the automatic writing means 14 writes an image on the display medium 1. The erased image storage memory 52 is used to read the image by the optical system reading unit 33 and temporarily store the image when the image on the display medium 1 is erased by the automatic erasing unit 22 and the cleaning unit 28.

The zoom circuit 53 enlarges or reduces the image to be printed at a specified ratio when the automatic writing means 14 or the printer means 40 prints based on the image data stored in the memory 51 or the erased image memory 52. As described above, the image data is converted. The print control unit 54 receives data from the zoom circuit 53 and receives the data from the thermal circuit 8 of the automatic writing unit 14 or the printer unit 40 according to an instruction from the control circuit 35.
The thermal head 41 is used to perform printing and control the adjustment of the print density.

As described above, the image data sent from each external input / output device is processed by the I / F 46 and the selector 5.
0 in the memory 51 and the memory 5
The image data stored in the I / F
It is possible to transmit to each external input / output device via 46. Therefore, the image scanner 4 of the external input / output device
5, the image data sent from the FAX 47a, the personal computer 47b or the memory device 48 is stored in the memory 51 through the I / F 46 and the selector 50, and the stored image data is transferred to the thermosensitive display medium 1 by the automatic writing means 14. It is possible to write on the colored layer 1d.

Further, the image written on the thermosensitive coloring layer 1d, the image written on the hard layer 1e with a writing instrument such as a felt pen, and the image written on the thermosensitive coloring layer 1d and the hard layer 1e. The combined image with the image is read by the optical system reading means 33, the image data is stored in the memory 51, and the image data is transmitted to the external input / output device for display on the screen by the personal computer 47b and the FAX 47.
a or a print display on a print medium by the printer 49,
Further, storage in the memory device 48 is possible.

Among the external input / output devices, for example, the image scanner 45, the memory device 48, or the FAX 47.
You may provide a etc. in an electronic blackboard apparatus. The operation of the electronic blackboard system having the above-described configuration will be described below. The thermal head 8, the heat roller 15, and the cleaning blade 23 normally have the home position at the position shown in FIG.

That is, the thermal head 8 is separated from the platen roller 3 against the compression coil spring 13, the heat roller 15 is separated from the display medium 1 by the plunger magnet 17 being driven, and the cleaning blade 23 is Both edge portions 23 a and 23 b are parallel to the display medium 1 so as to be separated from the display medium 1. <Automatic Writing Operation> First, according to an instruction from the operation unit 39, the control circuit 34 stores in the memory 51 the image data sent from the external input / output device, for example, the image scanner 45 via the I / F 46 and the selector 50. Next, the motor / magnet drive unit 36 is driven, the motor 26 is driven to rotate the blade support plate 24 in the direction of arrow k, and the edge portion 23a of the cleaning blade 23 is brought into pressure contact with the display medium 1.

Next, the motor 7 is driven to drive the platen roller 3
When the display medium 1 is run in the direction of arrow A by rotating in the direction of arrow g, the ink image and dust on the surface of the hard layer 1e of the display medium 1 by a writing instrument such as a felt pen are peeled off by the edge portion 23a of the cleaning blade 23. It is erased one after another. The distance from the position where the edge portion 1a is pressed against the display medium 1 to the thermal head 8 is L ₁ , and when the display medium 1 travels L ₁ from the start of erasing, the motor 12 is driven to move the cam 10 to the arrow d. Rotate in the direction
The thermal head 8 is pressed against the platen roller 3 with the display medium 1 sandwiched by the compression coil spring 13.

In this state, the image data stored in the memory 51 is reduced or enlarged to an image data of a predetermined size by the zoom circuit 53, and this image data is sent to the thermal head 8 via the print controller 54. . Since the display medium 1 is sandwiched between the thermal head 8 and the platen roller 3, the thermal head 8 sequentially sends the image data to the display medium 1 while printing the image data.

When printing is completed, the motor 15 is driven in the opposite direction to rotate the cam 10 in the direction of arrow c, and the thermal head 8 is separated from the display medium 1 against the compression coil spring 13. Further, the motor 26 is driven in the opposite direction to rotate the blade support plate 24 in the direction of the arrow l to separate the edge portion 23a of the cleaning blade 23 from the display medium 1, and the cleaning blade 23 becomes parallel to the display medium 1. And end.

Since the distance L ₁ is known in advance, when the print end position of the display medium 1 passes the edge portion 23a of the cleaning blade 23, the edge portion 23a of the cleaning blade 23 is separated from the display medium 1.
The thermal head 8 may be separated from the display medium 1 when printing is completed. <Image reading / copying operation> When a copy instruction is received from the operation unit 39, the light source 31 is turned on via the lighting unit 37. Next, the motor 7 is driven to rotate the platen roller 3 so that the display medium 1 travels in the direction of arrow B.

The image of the display medium 1 that has reached the image sensor 29 from the reading position is converted into an electric signal as one line in the horizontal direction, and the rotational speed of the platen roller 3 in the vertical direction, that is, the display medium. An image is formed as an electric signal in the vertical direction in synchronization with the traveling speed of 1, and the memory 51 is connected via the image processing unit 35 and the selector 50.
Memorized in.

Further, the image data stored in the memory 51 is output to the thermal head 41 via the zoom circuit 53 and the print controller 54. The control circuit 34 drives the motor 43 via the motor / magnet drive unit 36 in accordance with this output signal, rotates the platen roller 42, and prints on the thermal paper 44. <Automatic erasing operation> When the image erasing is instructed by the operation unit 39, the control circuit 34 drives the motor 26 via the motor / magnet driving unit 36, and rotates the blade supporting plate 24 in the direction of arrow l to clean the cleaning blade. The edge portion 23b of 23 is pressed against the display medium 1.

Next, when the motor 7 is driven to drive the display medium 1 in the direction of arrow B, the ink image and dust on the surface of the hard layer 1e of the display medium 1 are separated by the edge portion 23b of the cleaning blade 23 and erased one after another. It Edge 1b
From the position where is pressed against the display medium 1 to the heat roller 1
When the display medium 1 is run L ₂ from the start of erasing with the distance to 5 being L ₂ , the driving of the plunger magnet 17 via the motor / magnet drive unit 36 is stopped, and the tension coil spring 19 causes the heat roller 15 to move. Is pressed against the rubber roller 20 with the display medium 1 sandwiched therebetween.

When the platen roller 3 is further rotated in this state, the display medium 1 travels in the direction of arrow B, and the belt 21 also rotates the rubber roller 20 in the same direction as the platen roller 3 so that the distance between the rubber roller 20 and the heat roller 15 is increased. The display medium 1 sandwiched between is returned to white one after another by the heat roller 15 heated to a predetermined temperature (here, 63 ° C. as described above) and is sent in the direction of arrow B while being erased.

As described above, the cleaning blade 23 erases the ink image applied to the surface of the hard layer 1e of the display medium 1, and the heat roller 15 erases the image printed by the thermal head 8 on the thermosensitive coloring layer 1d. can do. When the erasing is completed, the plunger magnet 17 is driven to move the heat roller 15 away from the display medium 1, and the motor 26 is driven to rotate the blade support plate 24 in the arrow k direction to display the edge portion 23b of the cleaning blade 23. The cleaning blade 23 is separated from the medium 1, and the cleaning blade 23 is parallel to the display medium 1.

In the automatic erasing operation, since the image reading position by the optical system reading means 33 is in front of the heat roller 15 and the cleaning blade 23, the image before being erased by the heat roller 15 and the cleaning blade 23 is displayed. The image is read by the optical system reading unit 33, and the control circuit 34 reads the read image.
5 and stores it in the erased image memory 52.

As a result, the image on the display medium 1 is erased by the heat roller 15 and the cleaning blade 23 while being stored in the erased image memory 52. Therefore,
Even if the operator erroneously gives an erase instruction, the erased image remains in the erased image memory 52.
In response to a return printing instruction from the image data from the erased image memory 52, the zoom circuit 53 converts the image data into data that can be printed by the thermal head 8 and sends the data to the print control unit 54. The display medium 1 erased by the operation is printed again.

As described above, in the electronic blackboard system of this embodiment, it is possible to perform the automatic writing operation, the copying operation, the automatic erasing operation, and the return printing operation on the erasing screen. FIG. 9 is a sectional arrow view of the electronic blackboard device of the electronic blackboard system in the second embodiment of the present invention.

100 is a writing medium. This writing medium 100
Is a long shape having a length of a plurality of screens, and both ends thereof are wound around the rollers 101 and 102 leaving a length of one screen. Then, from one roller to the writing medium 100
The writing medium 100 is run while the writing medium 100 is wound around the other roller while being drawn.

Since the construction of the second embodiment is the same as that of the first embodiment except for the writing medium 100 and the mechanism for running the same, the description thereof will be omitted here. Further, also in the second embodiment having the above-mentioned configuration, it is possible to perform the automatic writing operation, the copying operation, the automatic erasing operation and the return printing operation on the erasing screen described in the first embodiment.

FIG. 10 is an explanatory diagram showing an operation example of the second embodiment. In the second embodiment, since the writing medium 100 has a length of a plurality of screens, each page has a length. It is possible to write an image by the automatic writing operation described in the first embodiment or by writing with a writing instrument. For example, as shown in FIG. 10A, 103 is an image written on the first page, 104 is an image written on the second page, 1
Reference numeral 05 is an image written on the third page, 106 is an image written on the fourth page, and the images spanning a plurality of pages are read one after another by the optical system reading means 33 and stored in the memory 51. Then, the stored data is reduced by the zoom circuit 53 and sent to the print controller 54 so that the thermal head 8 collectively writes the blank pages of the display medium 1 as shown in FIG. 10B. It is possible. If there is no empty page, unnecessary images may be erased by an automatic erasing operation to create an empty page.

As described above, since a plurality of pages can be displayed on one page, and in this second embodiment, data for four pages can be displayed collectively, data for a plurality of pages can be viewed at one time, and the efficiency of the conference can be improved. It is possible to raise. In the above-mentioned first and second embodiments, the tip is 70 ° C. to 1 as a writing instrument.
If a hot pen heated to 20 ° C. is used, it is possible to write on the heat-sensitive layer of the writing medium 1 with this hot pen, and an erasing member having an appropriate area at the tip is formed. The heat-sensitive layer can be returned to white by heating and pressing it against the display medium 1.

The application of the present invention is not limited to an electronic blackboard device, and since an image can be enlarged and printed on a display medium from a personal computer or an image scanner, an electronic bulletin board, a notice board, an OHP device, or an image on the display medium can be displayed on a personal computer or the like. Since it can be output to, it can be used as a large-scale image input / output device.

[0063]

As described above, according to the present invention, an electronic blackboard device and at least one electronic blackboard device to which the electronic blackboard device is connected are provided.
The electronic blackboard device is composed of an external input / output device and a heat-sensitive coloring layer capable of writing and erasing a signal image by application of heat and a hard layer capable of writing and erasing an image with a writing instrument for handwriting. A reversible display medium,
The traveling means for traveling the display medium, the optical system reading means for optically reading the image written on the display medium, the image data sent from the external input / output device and the optical system reading means. Storage means for storing image data, automatic writing means for writing a signal image on the thermosensitive coloring layer of the display medium by applying heat, and signal means written on the thermosensitive coloring layer of the display medium for erasing by applying heat An automatic erasing means and a cleaning means for erasing an image written by a writing instrument for handwriting on the hard layer of the display medium are provided.

Then, after the cleaning means erases the image written on the hard layer of the display medium with a writing instrument for handwriting, the automatic writing means writes a signal image on the heat-sensitive colored layer of the display medium on the erased surface. Means will be provided. As a result, after the ink and dust on the surface of the display medium are erased, the image is written by the automatic writing unit, so that the automatic writing unit is not polluted and the surface of the display medium is erased even when the automatic erasing unit erases. It will not pollute the automatic erasing means with the ink and dust of
There is an effect that the image quality is improved.

Further, an erased image storing means for reading an image just before being erased by the cleaning means and the automatic erasing means by the optical system reading means and storing this image data,
A control means for writing the image data stored in the erased image storage means into the thermosensitive coloring layer of the thermoreversible display medium by the automatic writing means is provided. As a result, even if the image data on the display medium is accidentally erased, the erased image data is stored, so it can be displayed on the display screen without inputting data or writing again. The effect is that it does not take time to restore the data that has been set.

Further, a printing means for printing the image data stored in the storage means and the erased image storage means on a print medium different from the display medium reduced from the screen of the display medium, and the printing means. By providing the enlarging / reducing means for enlarging or reducing the image data printed on the print medium, it is possible to view an image that is not currently displayed.

Further, by providing the enlarging / reducing means for enlarging or reducing the image data written in the display medium by the automatic writing means, for example, data for a plurality of pages can be displayed on one page and the display medium is run. It is possible to view data for a plurality of pages without needing to improve the efficiency of meetings and the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electronic blackboard device in an electronic blackboard system according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line ZZ of FIG.

FIG. 3 is a sectional view showing the operation of the automatic writing means.

FIG. 4 is a cross-sectional view of a display medium.

FIG. 5 is an explanatory diagram showing a hysteresis curve of transparency change with respect to temperature of a display medium.

FIG. 6 is a sectional arrow view showing the operation of the automatic erasing means.

FIG. 7 is a sectional arrow view showing the operation of the cleaning means.

FIG. 8 is a block diagram showing a control system of the electronic blackboard system according to the present embodiment.

FIG. 9 is a cross-sectional view of the electronic blackboard device of the electronic blackboard system according to the second embodiment of the present invention.

FIG. 10 is an explanatory diagram showing an operation example of the second embodiment.

[Explanation of symbols]

 1 Display Medium 14 Automatic Writing Means 22 Automatic Erasing Means 28 Cleaning Means 33 Optical System Reading Means 40 Printer Means 51 Memory 52 Erased Image Storage Memory 53 Zoom Circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichiro Ogata 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (5)

[Claims] 1. An electronic blackboard device and this electronic blackboard device are connected, at least image data can be output to the electronic blackboard device, and image data can be input from the electronic blackboard device.
Consisting of an external input / output device of a stand, the electronic blackboard device is capable of writing an image with a predetermined writing tool for handwriting, and a hard layer that can be wiped and erased from the written image and a signal image by applying heat. A thermoreversible display medium having a writable and erasable thermosensitive coloring layer; a traveling means for traveling the display medium; an optical system reading means for optically reading an image written on the display medium; Storage means for storing image data sent from the input / output device and image data read by the optical system reading means; automatic writing means for writing a signal image by applying heat to the thermosensitive coloring layer of the display medium; Automatic erasing means for erasing the signal image written in the thermosensitive coloring layer of the display medium by applying heat, and writing in the hard layer of the display medium with a writing instrument for handwriting An electronic blackboard system having a cleaning means for erasing a recorded image. 2. A control for erasing an image written by a writing instrument for writing on a hard layer of a display medium by the cleaning means, and then writing a signal image on the heat-sensitive colored layer of the display medium by the automatic writing means on the erased surface. The electronic blackboard system according to claim 1, further comprising means. 3. An erased image storage means for reading an image immediately before being erased by the cleaning means and the automatic erasing means by the optical system reading means and storing the image data.
2. The electronic blackboard system according to claim 1, further comprising control means for writing the image data stored in the erased image storage means into the thermosensitive coloring layer of the display medium by the automatic writing means. 4. A printing unit for printing the image data stored in the storage unit and the erased image storage unit on a print medium different from the display medium which is smaller than the screen of the display medium, and the printing unit. 4. The electronic blackboard system according to claim 1 or 3, further comprising enlarging / reducing means for enlarging or reducing the image data printed on the print medium. 5. Enlargement / enlargement for enlarging or reducing the image data written on the display medium by the automatic writing means.
The electronic blackboard system according to claim 1, further comprising a reducing means.