JPH07251596A - Large screen display device - Google Patents

Abstract

PURPOSE:To provide a device which can select colors of an image optionally and maintain the surface of a heat reversible display medium sheet in the beautiful state at all times. CONSTITUTION:Cleaning blades 30 and 31 are so disposed respectively on a thermal head 27 and a heat roller 21 as to move and rotate integrally with the movement of the thermal head 27 and the rotation of the heat roller 21. A plurality of pages of size in compliance with one page of a heat reversible display medium sheet are provided on a rear face of the heat reversible display medium sheet 2, and colors are selected for respective units, and the selected one page is transferred to the rear face of the heat reversible display medium sheet 2, by which a background color sheet 3 on which a colored image can be visualized is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large screen display device used for a bulletin board system, a guide board, an advertising board and the like.

[0002]

2. Description of the Related Art Conventionally, in a large-screen display device or the like, a transparent or opaque thermoreversible display medium sheet is selectively heated by a writing means to form an image on the thermoreversible display medium sheet. There is a device for erasing written and written images by an erasing means, and for writing an image on a thermoreversible display medium sheet with a predetermined writing tool and erasing by wiping.

An example of the disclosure of such a large screen display device is the device described in Japanese Patent Laid-Open No. 5-303339. According to the publication, in an electronic blackboard device which is a large-screen display device, a substrate, a coloring layer, a recording layer which becomes a cloudy state or a transparent state by application of heat, and a protection capable of writing an image by a predetermined writing instrument. A thermoreversible display media sheet is provided that is composed of layers.
Further, the electronic blackboard device includes a thermal head which is a part of an automatic writing means for writing an image on the thermoreversible display medium sheet and a part of an automatic erasing means for erasing the written image. A certain heat roller is provided.

In the case of writing an image on the thermoreversible display medium sheet, when the image of the material is input to the electronic blackboard device as image data, the image data is transferred to the automatic writing means, An image is written on the thermoreversible display medium sheet based on the image data by the automatic writing means. That is, the application of heat by the automatic writing means makes the recording layer in a cloudy state transparent, and the color of the colored layer becomes visible, and the written transparent image is visible by the color of the colored layer. When a supplement is added to this image, it is added to the protective layer with a predetermined writing tool such as a marker.

When an image is erased, the ink applied to the protective layer is wiped off, and then heat is applied to the thermoreversible display medium sheet by the automatic erasing means, so that the transparent portion of the recording layer disappears. It returns to white turbidity again, a white screen appears, and the image is erased.

Further, by coloring the sheet guide plate provided on the back surface of the thermoreversible display medium sheet, the protective layer is made transparent by eliminating the coloring layer of the thermoreversible display medium sheet, and the thermal head is used. Since the recording layer becomes transparent due to the application of heat, the image is visually observed depending on the color of the sheet guide plate.

[0007]

In the conventional large screen display device, the color of the transparent image of the thermoreversible display medium sheet written by the automatic writing means is the color of the thermoreversible display medium sheet. Although the color of the layer is displayed, the color of the colored layer is only one color and only a single color can be displayed, so that there is a problem that the image color cannot be arbitrarily selected.

Further, the ink added to the protective layer remains as an ink powder even when wiped with a cloth or the like, and when an image is written by the automatic writing means or erased by the automatic erasing means in this state, it remains. There is a problem in that the ink adheres to the automatic writing unit and the automatic erasing unit, and the print quality deteriorates.

Further, the transparent image is not made visible by the color of the colored layer of the thermoreversible display medium sheet, but the colored layer is eliminated and the transparent image is made visible by the color of the sheet guide plate. In this case, since the color of the sheet guide plate is generally black, the turbid portion of the recording layer of the thermoreversible display medium sheet mixes with black to become gray. In this state, even if the transparent image is written by the automatic writing means and the transparent image is visible in black, the contrast difference between the black image visible in the black sheet guide plate and the gray in the recording layer is small, There is a problem that the image becomes difficult to see.

[0010]

In order to achieve the above object, in a large screen display device of the present invention, an image is formed by selectively heating a transparent or opaque thermoreversible display medium sheet by a writing means. In a large-screen display device in which an image is written or erased by an erasing means, an image is written on the thermoreversible display medium sheet with a predetermined writing tool, and then erased by wiping, a page of the thermoreversible display medium sheet is used. A background color support having a plurality of pages of a size corresponding to the above, each page being color-coded, one selected page transferred to the back surface of the thermoreversible display medium sheet, and a colored image being visually observed. Prepare, and
The writing means is an automatic writing means, the erasing means is an automatic erasing means, and the automatic writing means and the automatic erasing means are integrally provided with cleaning means for erasing an image written by a writing instrument.

[0011]

A page coated with a desired color is transferred from a plurality of pages of the background color support to the back surface of the thermoreversible display medium sheet.
Further, the image is written on the thermoreversible display medium sheet by the automatic writing means. The written image is then visible in the desired transferred color of the background color support. Also,
Since the colors are arranged on a page-by-page basis, the image can be viewed in two colors by stopping the page transferred to the back surface of the thermoreversible display medium sheet at an arbitrary position. Therefore, the color of the image written on the thermoreversible display medium sheet can be selected by the automatic writing means.

The cleaning means can clean the surface of the thermoreversible display medium sheet before the image is written by the automatic writing means and before the image is erased by the automatic erasing means. Therefore, the thermoreversible display medium sheet
The surface of the glove can be kept clean at all times.

[0013]

Embodiments of the present invention will be described with reference to the drawings. Elements common to the drawings are given the same reference numerals. First Embodiment FIG. 1 is a sectional view of the device shown in FIG. 2 taken along the line YY, and FIG.
FIG. 3 is a perspective view showing the appearance of the electronic blackboard device of the embodiment, FIG.
5 is an explanatory view showing the structure of the rotary drum of the embodiment, FIG. 4 is a partial sectional view showing the thermoreversible display medium sheet of the first embodiment, FIG.
Is a hysteresis curve of the thermoreversible display medium sheet of the first embodiment, and FIG. 6 is an explanatory diagram showing the configuration of the background color sheet of the first embodiment. The first embodiment uses a plurality of thermoreversible display medium sheets.
A drum having a page is used. First, the structure of this drum will be described.

In FIG. 3, a plurality of single-cut thermoreversible display medium sheets 2 are attached to the rotary drum 1, and the sheets are wound around the rotary drum 1 so that the circumferential ends are evenly spaced. ing. Next, the thermoreversible display medium sheet 2 used here will be described.

In FIG. 4, a thermoreversible display medium sheet 2 is shown.
Is composed of a protective layer 2a, a recording layer 2b, and a substrate 2c. The protective layer 2a is composed of a transparent or translucent film having heat resistance or a UV curing agent, and can be written by a predetermined writing instrument such as a marker, and the written image can be erased by wiping. ing.

FIG. 5 shows the thermoreversible display medium sheet of the first embodiment.
The hysteresis curve of transparency change with temperature
It is the figure which showed the transmittance | permeability on the vertical axis | shaft and took the temperature on the horizontal axis.
As can be understood from FIG. 5, the thermoreversible display medium sheet 2
Is heated to a temperature within the range from 70 ° C. to 120 ° C. which is the melting point temperature of the trade name “ASMA- (made by Asahi Kasei)” (an example of the styrene-butadiene copolymer contained in the recording layer 2b). In that case, the recording layer 2b becomes transparent and shows the color of the background color sheet 3 described below under the recording layer 2b. When this is cooled to room temperature (about 25 ° C.) as it is, the background color sheet
The color of G.3 remains visible. In addition, 57
When heated to a temperature in the range of up to 68 ° C., the recording layer becomes opaque (that is, cloudy), and the color of the background color sheet 3 becomes invisible, and when it is cooled to room temperature as it is, the opaque state is fixed.

If a black sheet is placed under the substrate 2c, the transparent portion will be seen as black through the protective layer 2a, the recording layer 2b and the substrate 2c. The opaque portion, that is, the cloudy portion is reflected by the recording layer 2b through the protective layer 2a and appears white. After the transparent image is formed, the thermoreversible display medium sheet 2 is heated to 63 ° C. by a heater 21 to be described later, and a white screen is displayed again.

As described above, the thermoreversible display medium sheet 2 can repeatedly perform image formation and image erasure, and since the temperature for making the recording layer 2b transparent is as wide as 70 to 120 ° C., transparent recording is possible. Image formation by the method is easy.

Next, the thermoreversible display medium sheet 2 having the above structure
The configuration of the apparatus main body using the will be described. In FIG. 2, the housing 5 is supported by a stand 6 and a display unit 7 for displaying an image is displayed.
And an operation unit 8 are provided. As shown in FIG. 1, a rotating drum 1 for carrying the thermoreversible display medium sheet 2 extends in the carrying direction of the thermoreversible display medium sheet 2 and rotates in the upper part of the inside of the housing 5. Freely supported. Guide rollers 10a, 10b, 10c, 1 are provided around the rotary drum 1.
A guide belt 11 stretched around 0d is stretched. The guide belt 11 reduces the frictional resistance generated by the thermoreversible display medium sheet 2 when the rotating drum 1 is rotated in the reverse direction, and is rotated in conjunction with the rotation of the rotating drum 1. Has become.

A sheet separator 12 is provided below the rotary drum 1, and the sheet separator 12 is rotatable in the direction of the arrow LM to allow the rotary drum 1 to rotate. In cooperation with the rotation, the free end of the predetermined sheet of the thermoreversible display medium sheet 2 is hooked to separate it from the other thermoreversible display medium sheet 2, and the display portion 7 or the later-described will be described. The sheet is guided to the sheet image reading section 34.

A seat guide plate 14 which is a cradle having a size of one screen is provided at the back of the display unit 7. The seat guide plate 14 and the seat provided inside the display unit 7 are provided. With the guide plate 24, a page set passage 15 for guiding the thermoreversible display medium sheet 2 to the display portion 7 is formed. Also,
On the surface of the sheet guide plate 14, a backside color sheet 3 which is an elongated background color support, which will be described later, is provided in a state of being stretched over the rollers 17 and 18.

As shown in FIG. 6, the back color sheet 3 has a plurality of pages each having a size corresponding to one page of the thermoreversible display medium sheet 2. , White 25a,
Different colors such as black color 25b, red color 25c, blue color 25d, and silver color 25e are arranged. A thermoreversible display medium sheet 2 is provided on the page having the backside color sheet 3. Therefore, the transparent image written by the automatic writing unit 19 which will be described later can be visually recognized in the page color of the background color sheet 3. Since the silver color 25e has a high reflectance, the recording layer 2b
The white turbid area becomes closer to white, and the transparent image portion written by the automatic writing unit 19 described later has high reflection, and a clear image is seen as a whole. Therefore, if you want to see the image clearly, the background color
For the color of G3, silver 25e is selected.

As shown in FIG. 1, the sheet separator 12
An automatic erasing unit 20 as an erasing unit and an automatic writing unit 19 as a writing unit are provided between the sheet and the sheet guide plate 14 so as to extend in the width direction of the thermoreversible display medium sheet 2. Has been. The automatic erasing unit 20 is a heat roller 21.
And a roller support 22 rotatably supporting the roller 21 and having a cleaning blade 30 attached thereto, and a rubber roller disposed opposite to the roller 21.
And a sheet guide plate 26 arranged to face the cleaning blade 30. The cleaning blade 3 mounted on the heater support 21
0 is made of rubber, plastic or the like and has a plate shape having elasticity. In the lateral direction of the cleaning blade 30, one side of the cleaning blade 30 is the heater support 22.
It is attached by adhesive or the like so that it evenly protrudes from. The heater support 22 is pivotally supported by the housing 5.

The heater roller 21 and the cleaning blade 30 are driven by predetermined motors so that the shaft 22a of the heater roller support 22 is centered by a drive mechanism (not shown). It rotates in the direction of arrow AB. When rotated in the direction of arrow A, the heater roller 21 is kept at a position away from the rubber roller 23, and the cleaning blade 30 is kept at a position away from the sheet guide plate 26. On the other hand, when rotating in the direction of arrow B, the heater roller 21 is pressed against the rubber roller 23, and the cleaning blade 30 is shielded.
It is pressed against the guide plate 26. In this state, if the thermoreversible display medium sheet 2 is sandwiched between the heat roller 21 and the rubber roller 23, the thermoreversible display medium sheet 2 is heated to 63 ° C. -Troller 21 returns to a white screen and is automatically erased. And the cleaning blur
The protective layer 2 of the thermoreversible display medium sheet 2 is provided by the window 30.
The ink image, dust, and the like written on a with a predetermined writing instrument are erased by peeling.

The automatic writing section 19 is a thermal head 27.
And a platen rotor arranged to face the thermal head 27.
A blade 29, a blade support plate 32 attached to the thermal head 27, a cleaning blade 31 attached to the blade support plate 32, and a cleaning blade 31 opposed to each other. A sheet guide plate 26 and a thermal head 27, one end of which is fixed to the thermal head 27 and the other end of which is fixed to the housing 5, and a compression coil spring 28 for urging the thermal head toward the platen roller 29 and a platen roller 29. Arrow E
It is composed of a predetermined motor that is rotationally driven in the -R direction. The thermal head 27 and the cleaning blade 31 can be moved in the directions of arrows CD by a drive mechanism (not shown). When moved in the direction of arrow D, the thermal head 27 is kept at a position away from the platen roller 29, and the cleaning blade 31 is kept at a position away from the sheet guide plate 26. On the other hand, when moved in the direction of arrow C, the thermal head 27 moves to the platen roller 29.
The cleaning blade 31 is pressed against the sheet guide plate 26.

When the platen roller 29 is rotated in the arrow E and arrow R directions by rotating a predetermined motor, the rubber roller 23 is also rotated in the arrow E and arrow R directions. Are connected by. With this structure, if the thermoreversible display medium sheet 2 is sandwiched between the platen roller 29 and the thermal head 27, the platen roller 2
By rotating 9 in the direction of the arrow R, the cleaning blade 31 erases the ink image, dust, and the like added to the protective layer 2a of the thermoreversible display medium sheet 2 with a predetermined writing tool by peeling. With the thermal head 27, a transparent image can be written on the recording layer 2b of the thermoreversible display medium sheet 2.

A sheet guide plate 82 is provided on the inner back side of the casing 5, and the casing 5 and the sheet guide plate 82 are provided.
A sheet guiding passage 33 is formed by. The sheet guide passage 33 is provided so as to face the page set passage 15. The sheet guiding passage 33 is provided in the rotary drum 1.
When the selected heat-reversible display medium sheet 2 is guided to the page set path 15, the heat-reversible display medium sheet 2 other than the page is used when unwinding. It is guided with a sheet guide plate 82 interposed.

Sheet guide plate 14 and sheet guide plate 82
A sheet image reading section 34 as sheet image reading means is provided between the sheet and the sheet image reading section 34. The sheet image reading section 34 reads the image of the thermoreversible display medium sheet 2. Image sensor 36, condenser lens 37, mirror 38
And a light source 35 and a back plate 39. In the surface image of the thermoreversible display medium sheet 2, the irradiation light from the light source 35 is reflected at the reading position, and the reflected light is reflected by the mirror 38,
After the reflected light is condensed by the condenser lens 37, it is positioned so as to reach the image sensor 36. In addition,
Since the image written by the automatic writing unit 19 is a transparent image, the back plate 39 is colored black. As a result, the transparent image is displayed as black information by the image sensor 36.
Read by.

FIG. 7 is a plan view showing the operating portion of the first embodiment, and the operating portion 8 is provided with various input keys. The power-on key 66 is an input key for bringing the entire device into a power supply state, and the power-off key 67 is an input key for bringing the power supply state into a stopped state. The indicator 77 displays the page number of the thermoreversible display medium sheet 2 currently set and displayed on the sheet guide plate 14. A numeric keypad 78 is an input key for inputting a page number by a numeric value from 0 to 9, and a clear key 79 is an input key for canceling the numeric value by the numeric keypad 78.

The page feed key 68 is an input key for selecting the next page set of the page number displayed on the indicator 77, and the direct page key 80 is an input for directly selecting the set page. It's a key. The page return key 69 is an input key for selecting the previous page of the thermoreversible display medium sheet 2 being displayed. The automatic erasing key 70 is an input key for erasing the image of the thermoreversible display medium sheet 2 by the automatic erasing unit 20, and the automatic writing key 71 is an interface described later.
The image data received via the space 47 is sent to the thermal head 2
7 is an input key for instructing writing to the thermoreversible display medium sheet 2.

The marquee kiss key 72 is an input key for instructing to erase only the image added by the writing tool on the thermoreversible display medium sheet 2, and the read transmission key 73.
Is a transparent image of the thermoreversible display medium sheet 2 currently displayed on the sheet guide plate 14, and the sheet image reading unit 3
4 is an input key for instructing to read and transmit to the external input / output device via the interface 47.

The background color feed key 74 is a sheet guide plate 14
The background color return key 75 is an input key for instructing to send the above background color sheet 3 in the direction of arrow Q shown in FIG. Input key to
Is. The background color stop key 76 is an input key for instructing to stop the background color sheet 3 during the feeding and returning operations.
Is. As a result, the background color sheet 3 can be stopped at any position. If the background color stop key 76 is not pressed during the feeding and returning operations, the background color
The page 3 is set so as to be fed or returned by one page.

Next, the control system of the electronic blackboard device 40 will be described. FIG. 8 is a block diagram showing the control system of the electronic blackboard device of the first embodiment. Note that, in FIG. 8, a control system of the electronic blackboard device 40 is configured by a configuration surrounded by a two-dot chain line, and the others are external input devices. In FIG. 8, the control circuit 4
Reference numeral 1 is composed of a microprocessor memory and the like, and all circuits described later are connected to and controlled by the control circuit 41. The image processing unit 42 irradiates the reading position of the thermoreversible display medium sheet 2 with the light source 35 to illuminate the image sensor 3
The reflected light arriving at 6 is converted into an electric signal, the electric signal is assembled into an analog signal by a predetermined method, and further this signal is amplified, and the analog signal is converted into a digital signal and binarized. To do.

The motor driving unit 43 is a thermoreversible display medium sheet.
2 running, background color sheet 3 running, automatic writing unit 1
9, a predetermined mode for driving the automatic erasing unit 20, the rotary drive of the rotary drum 1, the rotation of the sheet separator 12, and the like.
Drive the data. The lighting unit 44 turns on and off the light source 35. The heat driver 45 drives the heat roller 21 so as to keep it at a constant temperature. The operation unit 8 inputs instructions for writing and erasing a transparent image on the thermoreversible display medium sheet 2, and instructions for running the thermoreversible display medium sheet 2 and the background color sheet 3. . The power supply unit 55 is connected to an alternating current of 100 V and converted into a direct current voltage to supply power to the entire device.

The image scanner 46 functions as an external input device to read characters and pictures on a printed matter and convert them into electric signals.
This image is sent to the electronic blackboard device 40 via the interface (I / F) 47. Facsimile machine 48
Reads characters and paintings on printed materials and converts them into electrical signals,
This image data is used for telephone lines and interfaces (I / F)
47 to the electronic blackboard device 40, and also the electronic blackboard device 4
Data sent from 0 through an interface (I / F) or a telephone line is printed on a medium. In addition,
Each external input / output device such as a personal computer 49, a memory device 50 (a storage device such as a floppy disk or a hard disk), and a printer device 51 is an electronic blackboard device 40.
It is possible to send and receive image data to and from. The selector 52 reads the image of the thermoreversible display medium sheet 2 with the image sensor 36 and processes it with the image processing section 42, and the interface 4 from the external input / output device.
The data obtained via 7 is selected and sent to the memory 53. The memory 53 stores the data sent via the selector 52.

The print control unit 54 receives data from the memory 53, transmits this data to the thermal head 27 of the automatic writing unit 19 for writing, and controls print density adjustment. It is a thing. Among the external input devices, for example, the printer device 51, the image scanner 46,
The facsimile device 48 and the like may be provided in the electronic blackboard device 40.

Next, the operation will be described. FIG. 9 is an explanatory diagram showing the automatic write operation and the automatic erase operation of the first embodiment,
FIG. 10 is a partially enlarged explanatory view showing the automatic write operation of the first embodiment, FIG. 11 is a partially enlarged explanatory view showing the automatic erase operation of the first embodiment, and FIG. 12 is an explanation showing the automatic read operation of the first embodiment. It is a figure.

In FIG. 7, the power-on key 6 of the operating section 8 is turned on.
When 6 is pressed, the control circuit 41 drives a predetermined motor through the motor drive section 43, and as shown in FIG.
Rotate the troller 21 in the direction of arrow A to move the heat roller 2
1 and the rubber roller 23, and between the cleaning blade 30 and the sheet guide plate 26. At the same time, a predetermined motor is driven through the motor drive unit 43 to move the thermal head 27 in the direction of arrow D by a drive mechanism (not shown) so as to move between the thermal head 27 and the platen roller 29. , And between the cleaning blade 31 and the sheet guide plate 26. This state is maintained except for the automatic write and automatic erase operations described later. Now, the details will be sequentially described.

[Page Selection] In the operation unit 8 shown in FIG.
Enter the page number n with the numeric keypad 78 and
Press Jiki-80. When the page number is input, the number "n" is displayed on the indicator 77. Subsequently, the control circuit 41 drives a predetermined motor through the motor drive section 43 to rotate the rotary drum 9 shown in FIG. At the same time as the rotation of the rotary drum 1 starts, the control circuit 41
Is the sheet separation from the drive reference position at the free end of page n.
The number of drive pulses for rotating the rotary drum 1 to the point where the motor 12 is caught and restrained is calculated, and the calculated number is used as the motor drive unit 4.
Send to 3. The motor drive unit 43 gives the number of drive pulses to a predetermined motor. This allows a plurality of thermoreversible display medium sheets
When the free end of the n-th page of the sheet 2 is hooked on the sheet separator 12, the motor drive unit 43 subsequently gives a predetermined motor a reverse rotation instruction.

As a result, the rotary drum 1 as shown in FIG.
Rotates in the reverse direction, that is, a certain number of pulses in the direction of arrow H, the winding of the thermoreversible display medium sheet 2 is released, and unselected pages extend to the sheet guiding passage 33 and are selected. The second page, that is, the nth page whose free end is hooked on the sheet separator 12 is extended in the direction of arrow I in the page set passage 15 while being separated from the other pages, and is drawn out onto the sheet guide plate 14. The image of page n is displayed on the display unit 7.

When the page return key 69 is depressed in this state, the rotary drum 1 rotates in the direction of arrow H, and the thermoreversible display medium sheet 2 can be wound around the rotary drum 1 and then rewound. . Further, when the page feed key 68 is pressed with the thermoreversible display medium sheet 2 pulled out on the sheet guide plate 14, the thermoreversible display medium sheet on the sheet guide plate 14 is pressed. The sheet 2 is wound around the rotary drum 1, and the free end of the sheet n 2 of the thermoreversible display medium on page n + 1, which is the next page of page n, is hooked on the sheet separator 12 and the sheet guide plate 1.
4 and can be displayed on the display unit 7. At this time, the number "n + 1" on the next page is displayed on the indicator 77.

[Automatic Writing] The operation of writing the image of the original read by the image scanner 46 on the thermoreversible display medium sheet 2 of the nth page is as follows.

First, when the number "q" of the page to which a transparent image is to be written is set by the numeric keypad 78 and then the automatic writing key 71 is depressed, the above-mentioned page selecting operation is performed and the free end of page q is set. Hook onto the sheet separator 12. Next, the control circuit 4
1 rotates the rotary drum 1 in the direction of arrow G,
Of the platen roller 2
When a position slightly past 9 is reached, a predetermined motor is driven via the motor drive section 43, and the thermal head 27 is moved in the direction of arrow C by a drive mechanism (not shown) as shown in FIG. Then, the cleaning blade 31 and the thermal head 27 are brought into pressure contact with the thermoreversible display medium sheet 2. Then, when the platen roller 29 is rotated in the direction of arrow R by a predetermined motor through the motor drive section 43, the ink written on the protective layer 2a of the thermoreversible display medium sheet 2 by a writing instrument is used. The image and dust are separated by the edge portion of the cleaning blade 31, and then the thermal head 27 writes a transparent image on the recording layer 2b of the thermoreversible display medium sheet 2. As described above, the image of the original read by the image scanner 46 can be written on the thermoreversible display medium sheet 2.

As a second method of the automatic writing operation, the automatic writing key is selected without selecting the automatic writing page with the ten key 78.
When 71 is pressed, the control circuit 41 selects one page from the plurality of unwritten pages stored in the memory 53 and automatically selects the unwritten page selected by the page selection operation. The image is fed to the writing unit 19 and the image of the image scanner 46 is written.

[Automatic erasing] The operation of erasing the image written by the automatic writing operation is as follows.

As described above, the automatic erasing key 70 is pressed in a state where the thermoreversible display medium sheet 2 that has been automatically written or written with a writing instrument is extended to the display section 7. Then, the control circuit 41 drives a predetermined motor through the motor drive unit 43. Then, as shown in FIG. 11, the heater roller 21 rotates in the direction of arrow B about the shaft 22a of the heater roller support 22 by a drive mechanism (not shown). As a result, the heat roller 21 is pressed against the rubber roller 23, and the cleaning blade 30 is pressed against the page set passage 15
Project to. In this state, when the rotating drum 1 is rotated in the direction of arrow H shown in FIG. 1 and the rubber roller 23 is rotated in the direction of arrow E according to an instruction from the control circuit 41, the thermoreversible display medium sheet 2 is rotated by the rotating drum. The ink image, dust, and the like, which have been wound around 1, and applied by a predetermined writing instrument to the protective layer 2a of the thermoreversible display medium sheet 2 by the cleaning blade 30, are erased by peeling. Then, after that, the thermoreversible display medium sheet 2 sandwiched between the heat roller 21 and the rubber roller 23 becomes a white screen by the heat roller 21 heated to 63 ° C. It is returned and automatically erased.

When the automatic erasing operation is completed, a predetermined motor is driven through the motor driving section 43, and the driving mechanism (not shown) as shown in FIG. -Rotate the cord 30 in the direction of arrow A to open the space between the heat roller 21 and the rubber roller 23.

As the second image erasing operation, the number "m" of pages for which an image is to be erased is set by the numeric keypad 78, and then the automatic erasing key 70 is pressed to perform the page selecting operation and the rotary drum. The number "m" of pages of which the image of the thermoreversible display medium sheet 2 wound around 1 is to be erased is extended to the page set passage 15 and displayed on the display unit 7. After that, as described above, the predetermined motor is driven through the motor drive unit 43, and the heater roller 21 is pushed onto the rubber roller 23 by a drive mechanism (not shown) as shown in FIG. Then, the cleaning blade 30 is projected into the page set passage 15. Then, the cleaning blade 30 removes the ink image, dust, and the like added by a predetermined writing tool on the protective layer 2a of the thermoreversible display medium sheet 2 by peeling, and thereafter, the heat roller. The thermoreversible display medium sheet 2 sandwiched between the roller 21 and the rubber roller 23 is attached to the heater 21.
To return to the white screen and automatically erase.

It should be noted that the marker bar of the operation unit 8 shown in FIG.
When the zoom key 72 is pressed, the heat roller 21 is kept at room temperature in the automatic erasing operation. Then, only the ink image on the surface of the protective layer 2a of the thermoreversible display medium sheet 2 is erased.

[Image reading operation] First, the number "r" of pages for which an image is to be read is set by the numeric keypad 78 shown in FIG. 7, and the read transmission key 73 is pressed. Then, the control circuit 41 drives a predetermined motor through the motor drive unit 43. Then, the drive mechanism (not shown) causes the sheet separator 12 to rotate in the direction of arrow L as shown in FIG.
Then, the free end of page r is hooked on the sheet separator 12. Next, when the rotary drum 1 is rotated in the arrow G direction,
A page is read by a sheet separator 12 and a sheet reading passage 8 is provided.
1, the remaining pages extend to the sheet guide passage 33 with the (r-1) th page facing up. When the reading start position of page r reaches the reading position, the light source 5 is turned on via the lighting unit 44.
Turn on 5. Further, page r is extended in the direction of arrow K. Then, the image of the thermoreversible display medium sheet 2 on page r which has reached the image sensor 36 from the reading position is converted into an electric signal as one line in the horizontal direction,
In the vertical direction, the screen is configured as an electric signal in the vertical direction synchronized with the extension speed of the thermoreversible display medium sheet 2, and is stored in the memory 53 via the image processing unit 42 and the selector 52.

Further, the image data stored in the memory 53 is transferred via an interface 47 to an external input device, for example,
It is output to the printer device 51 and printed.

[Background color selection operation] When the background color feed key 74 of the operation unit 8 is pressed, the control circuit 41 drives a predetermined motor through the motor drive unit 43, and the operation shown in FIG. Shown in
Rotate the rotors 17 and 18 to drive the back color sheet 3 in the direction of arrow Q. The key to stop the background color of the operating unit 8 during running
When is pressed, the control circuit 41 stops the driving of a predetermined motor through the motor driving unit 43. As a result, the background color sheet 3 can be stopped at any position.
When the background color stop key 76 of the operation unit 8 is not pressed, the background color sheet 3 runs for one page and stops. In this way, the pressing operation of the background color feed key 74 is repeated until the desired color is drawn to the display unit 7.

When the background color return key 75 of the operation unit 8 is pressed, the control circuit 41 drives a predetermined motor (not shown) via the motor drive unit 43 to cause the roller 17, 18 is rotated to drive the background color sheet 16 in the direction of arrow P. Similarly to the above, when the background color stop key 76 of the operation unit 8 is pressed during traveling, the control circuit 41 stops the drive of a predetermined motor (not shown) via the motor drive unit 43. . If the background color stop key 76 of the operation unit 8 is not pressed, the background color
The page 3 is rewound by one page and stopped.

As described above, an arbitrary color of the background color sheet 3 can be freely drawn on the sheet guide plate 14. For example, if white is selected for the entire sheet guide plate 14, the transparent image written by the automatic writing unit 19 becomes white, and the thermoreversible display medium sheet 2 on the sheet guide plate 14 becomes all white. The transparent image can be made invisible once. Further, since the background color sheet 3 can be stopped at an arbitrary position, for example, if white 25a is selected for the upper half, the transparent image of the upper half cannot be seen. In addition, the background color sheet 3 is black 25
b and red 25c are arranged in this order, the upper half black image,
The lower half red image can be selected, for example, for educational purposes, the black image could be the question, the red image could be the student's answer, and so on.

Incidentally, in the first embodiment described above, FIG.
, The background color sheet 3 is a single color, for example, black 25f.
In addition, a part of the black color 25f may be provided with another strip-shaped colored area of one page or less, for example, red color 25g. If the band-shaped colored area has a size of one line, the background color can be changed line by line in the displayed image, and the transparent image written in the thermoreversible display medium sheet 2 can be displayed. This is convenient when explaining in units. FIG. 13 is an explanatory diagram showing another structure of the background color sheet of the first embodiment.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. FIG. 14 is an explanatory view showing the structure of the electronic blackboard device of the second embodiment, and FIG. 15 is a ZZ sectional arrow view of the device shown in FIG.

The second embodiment differs from the first embodiment in that the display portion 7 is made longer in the width direction than in the vertical direction, and the thermoreversible display medium sheet 2 is endless. The rollers 60 and 61 are bridged, and the rollers 60 and 61 are rotated according to an instruction input from the operation unit 8 to rotate the rollers 60 and 61.
This is the point of feeding and winding between the la 60 and 61.

Specifically, as shown in FIG. 14, a long thermoreversible display medium sheet 2 having a plurality of screen lengths is rotatably supported in parallel with each other in a casing (not shown). It is suspended between rollers 60 and 61. On the back side of the writing surface of the thermoreversible display medium sheet 2, a background color sheet 3 which is an elongated background color support is rotatably parallel to each other on a frame (not shown). It is suspended between the rollers 62 and 63 which are pivotally supported. A sheet guide plate 14, which is a pedestal having a size of one screen, is provided on the back surface of the background color sheet 3. Since the structures of the thermoreversible display medium sheet 2 and the background color sheet 3 are the same as those in the first embodiment, the description thereof will be omitted.

As shown in FIG. 15, the medium running path 6 through which the thermoreversible display medium sheet 2 between the rollers 60 and 61 is conveyed.
4, a display unit 7 for displaying a screen, an automatic erasing unit 20 as an erasing unit, and an automatic writing unit 19 as a writing unit extend in the width direction of the thermoreversible display medium sheet 2. Is provided. The automatic erasing unit 20 is a heater
Heater rotatably supporting the roller 21 and the heat roller 21 and having a cleaning blade 30 attached thereto.
It comprises a roller support 22, a rubber roller 23 opposed to the heater roller 21, and a sheet guide plate 65 opposed to the cleaning blade 30. The cleaning blade 30 attached to the heater support 21 is made of rubber, plastic or the like, and has a plate shape having elasticity. Further, in the lateral direction of the cleaning blade 30, one side of the cleaning blade 30 is attached by adhesion or the like so as to evenly protrude from the heater roller support 22. The heater support 22 is pivotally supported by a casing (not shown).

The heater roller 21 and the cleaning blade 30 are driven by predetermined motors so that the shaft 22a of the heater roller support 22 is centered by a drive mechanism (not shown). It rotates in the direction of arrow AB. When rotated in the direction of arrow A, the heater roller 21 is kept at a position away from the rubber roller 23, and the cleaning blade 30 is kept at a position away from the sheet guide plate 65. On the other hand, when rotating in the direction of arrow B, the heater roller 21 is pressed against the rubber roller 23, and the cleaning blade 30 is shielded.
It is pressed against the guide plate 65. In this state, if the thermoreversible display medium sheet 2 is sandwiched between the heat roller 21 and the rubber roller 23, the thermoreversible display medium sheet 2 is heated to 63 ° C. -Troller 21 returns to a white screen and is automatically erased. And the cleaning blur
The protective layer 2 of the thermoreversible display medium sheet 2 is provided by the window 30.
The ink image, dust, and the like written on a with a predetermined writing instrument are erased by peeling.

The automatic writing unit 19 is the thermal head 27.
And a platen rotor arranged to face the thermal head 27.
A blade 29, a blade support plate 32 attached to the thermal head 27, a cleaning blade 31 attached to the blade support plate 32, and a cleaning blade 31 opposed to each other. The sheet guide plate 83, one end of which is fixed to the thermal head 27 and the other end of which is fixed to a casing (not shown), and the compression coil spring 28 for urging the thermal head to the platen roller 29 and the platen roller. And a predetermined motor for driving the rotor 29 to rotate in the direction of arrow E-R. Thermal head 27 and cleaning blade 3
1 is movable in the direction of arrow CD by a drive mechanism (not shown). When moved in the direction of arrow D, the thermal head 27 is kept at a position away from the platen roller 29, and the cleaning blade 31 is moved to the seat guide plate 83.
Kept away from. On the other hand, when moved in the direction of arrow C, the thermal head 27 moves to the platen roller 2
9 and the cleaning blade 31 is pressed against the sheet guide plate 83.

When the motor is rotated and the platen roller 29 is rotated in the directions of arrow E and R,
The rubber roller 23 is also connected by a belt so as to rotate in the arrow E direction and the arrow R direction. In this configuration, if the thermoreversible display medium sheet 2 is sandwiched between the platen roller 29 and the thermal head 27, the platen roller 29 is rotated in the direction of arrow R to clean the blade.
The protective layer 2 of the thermoreversible display medium sheet 2 is provided by the window 31.
It is possible to erase an ink image, dust, or the like written on a by a predetermined writing tool by peeling and write a transparent image on the recording layer 2b of the thermoreversible display medium sheet 2 by the thermal head 27.

A sheet image reading section 34 as sheet image reading means is provided on the back surface of the thermoreversible display medium sheet 2. The sheet image reading section 34 is thermoreversible. Image sensor 36 for reading the image of the image display medium sheet 2, a condenser lens 37, a mirror 38, and a light source 35.
And a back plate 85. Thermoreversible display medium sheet 2
In the surface image of, the irradiation light from the light source 35 is reflected at the reading position, the reflected light is reflected by the mirror 38, and the reflected light is condensed by the condenser lens 37, and then reaches the image sensor 36. It is located in. Since the image written by the automatic writing means 19 is a transparent image, the rear plate 39 is colored black. As a result, the transparent image is read by the image sensor 36 as black information.

FIG. 16 is a plan view showing the operating portion of the second embodiment, and the operating portion 8 is provided with various input keys. The operating portion 8 of the second embodiment is the same as the operating portion 8 of the first embodiment except that it has an indicator 77, a numeric keypad 78, and a direct page key 8.
The configuration is the same as that of the operation unit 8 of the first embodiment except that 0 is deleted. Therefore, the description is omitted.

Since the control system of the electronic blackboard device 84 of the second embodiment is the same as that of the first embodiment, the description thereof will be omitted.

Next, the operation will be described. FIG. 17 shows the second
FIG. 18 is a partially enlarged explanatory view showing the automatic writing operation of the embodiment.
FIG. 7 is a partially enlarged explanatory view showing an automatic erasing operation of the second embodiment. In FIG. 16, first, the power on key 6 of the operation unit 8 is turned on.
When 6 is pressed, the control circuit 41 drives a predetermined motor through the motor drive section 43 to rotate the heater 21 in the direction of arrow A as shown in FIG. , The heat roller 21 and the rubber roller 23 are separated from each other, and a predetermined motor is driven through the motor drive section 43 to move the thermal head 27 to the arrow D by a drive mechanism (not shown). In this direction, the thermal head 17 and the platen roller 29 are opened, and the cleaning blade 31 and the sheet guide plate 83 are opened. This state is maintained except for the automatic write and automatic erase operations described later. Now, the details will be sequentially described.

[Automatic Writing] The operation of writing the image of the original read by the image scanner 46 on the thermoreversible display medium sheet 2 is as follows.

First, when the automatic write key 71 of the operation unit 8 shown in FIG. 16 is depressed, the control circuit 41 causes the motor drive unit 4 to operate.
3, a predetermined motor is driven to move the thermal head 27 in the direction of arrow C by a drive mechanism (not shown) as shown in FIG. 17 to move the cleaning blade 31 and the thermal head 27. It is pressed against the thermoreversible display medium sheet 2. Then, when the platen roller 29 is rotated in the direction of arrow R by a predetermined motor through the motor drive section 43, the ink written on the protective layer 2a of the thermoreversible display medium sheet 2 by a writing instrument is used. Images and dust are peeled off by the edge portion of the cleaning blade 30, and then a transparent image is written on the recording layer 2b of the thermoreversible display medium sheet 2 by the thermal head 27. As described above, the image of the original read by the image scanner 46 can be written on the thermoreversible display medium sheet 2.

[Automatic erasing] The operation of erasing the image written by the automatic writing operation is as follows.

As described above, in the state where the thermoreversible display medium sheet 2 which is automatically written or added with a writing instrument is extended to the display section 7, the automatic erasing key 70 of the operating section 8 shown in FIG.
Press. Then, the control circuit 41 causes the motor drive unit 43 to operate.
A predetermined motor is driven via. Then, as shown in FIG. 18, the heater controller 2 is driven by a drive mechanism (not shown).
With the axis 22a of No. 2 as the center, the heater roller 21 shows an arrow B.
Rotate in the direction. As a result, the heater roller 21 is pressed against the rubber roller 23, and the cleaning blade 30 is pressed.
Projects into the medium running path 64. In this state, the control circuit 41
, Rotate the rubber roller 23 in the direction of arrow E,
When the rubber roller 23 is rotated in the direction of arrow E, the thermoreversible display medium sheet 2 is wound around the roller 60 shown in FIG. 15, and the cleaning blade 30 is used to remove the thermoreversible display medium. The ink image, dust, and the like written on the protective layer 2a of the sheet 2 with a predetermined writing tool are erased by peeling. Then, after that, the thermoreversible display medium sheet 2 sandwiched between the heat roller 21 and the rubber roller 23 becomes a white screen by the heat roller 21 heated to 63 ° C. It is returned and automatically erased.

When the automatic erasing operation is completed, a predetermined motor is driven through the motor driving unit 43, and a driving mechanism (not shown) as shown in FIG. -Rotate the cord 30 in the direction of arrow A and
Open between the la 21 and the rubber roller 23.

When the mark lay key 72 of the operation unit 8 shown in FIG. 16 is depressed, the heat roller 21 is kept at room temperature in the automatic erasing operation. Then, only the ink image on the surface of the protective layer 2a of the thermoreversible display medium sheet 2 is erased.

[Image reading operation] First, the reading transmission key 73 of the operation unit 8 shown in FIG. 16 is pressed. Control circuit 41
Rotates the rollers 60 and 61 to move the thermoreversible display medium sheet 2 in the direction of arrow P shown in FIG.
Drive up to. Then, when the reading start position of the thermoreversible display medium sheet 2 comes to the reading position, the light source 55 is turned on via the lighting unit 44. Furthermore, a thermoreversible display medium sheet
Toe 2 travels in the direction of arrow P. The image of the thermoreversible display medium sheet 2 that has reached the image sensor 36 from the reading position is converted into an electric signal as one line in the horizontal direction, and the thermoreversible display medium in the vertical direction. The screen is configured as a vertical electric signal in synchronization with the expansion speed of the sheet 2, and is stored in the memory 53 via the image processing unit 42 and the selector 52.

Further, the image data stored in the memory 53 is transferred via an interface 47 to an external input device, for example,
It is output to the printer device 51 and printed.

[Background Color Selection Operation] The background color selection operation is the same as that in the first embodiment, and therefore its explanation is omitted.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to the drawings. The same parts as those in the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted. 19 is an explanatory view showing the structure of the electronic blackboard device of the third embodiment, and FIG. 20 is FIG.
9 is an XX sectional arrow view of the apparatus shown in FIG. 9, and FIG. 21 is an explanatory view showing the configuration of the second background color sheet of the third embodiment. The third embodiment differs from the first and second embodiments in that the background color sheet can be moved in the two-dimensional direction.

More specifically, as shown in FIGS. 19 and 20, it is a pedestal, and guide shafts 86 and 87 are provided in a frame (not shown) in parallel with the width direction of the black sheet guide plate 14. There is. A carriage 88 is slidably provided on the guide shafts 86 and 87.
Are provided with rollers 89 and 90, respectively. A narrow background color sheet 16 which is a background color support having an endless shape having a predetermined width is stretched over the rollers 89 and 90. A gear 91 is provided on the roller 89, and the gear 91 meshes with a gear 93 directly connected to the motor 92. Therefore, when the motor 92 is driven, the gear 93 rotates, and the gear 91 meshing with the gear 93 rotates, whereby the roller 89 rotates and the narrow background color sheet 16 Runs in the direction of arrow ST. The rollers 89 and 90, the gear 91, and the motor 9
2 and the gear 93 constitute a traveling means.

Further, a belt 94 is fixed to the carriage 88, and the belt 94 is wound around the pulleys 95 and 96. A gear 97 is fixed to the coaxial shaft of the pulley 95, and the gear 97 meshes with the gear 99 of the motor 98. Therefore, when the motor 98 is driven, the gear 9
9 rotates, and the gear 97 meshing with the gear 99 rotates, the roller 95 rotates, and the belt 9 rotates.
4 runs in the direction of arrow N-O, which causes the narrow background color sheet 16 to run in the direction of arrow N-O.

A thermoreversible display medium sheet (not shown) is provided on the front side of the narrow background color sheet 16, and a predetermined layer is formed on the protective layer 2a of the thermoreversible display medium sheet 2. When writing an image with the writing instrument, the carriage 88 is run in the direction of the arrow N and retracted from the sheet guide plate 14.
The step between the narrow background color sheet 16 and the sheet guide plate 14 may be eliminated to facilitate writing on the protective layer 2a of the thermoreversible display medium sheet.

In FIG. 21, the narrow background color sheet 16 is provided with a transparent portion 100a, and the transparent portion written by the automatic writing portion 19 shown in the first and second embodiments. The image is visually recognized by the color of the sheet guide plate 14.
In addition, a colored region of a predetermined size, a red region 100b, and a white region 100c are provided in a part of the transparent portion 100a.

Next, the operation section of the third embodiment will be described. FIG. 22 is a plan view showing the operating portion of the third embodiment.
In FIG. 22, a cursor key 101 is provided on the operation unit 8. The cursor key 101 is a narrow background color
Cursor 101a for driving the toe 16 in the direction of arrow S
And the cursor key 101b for moving the narrow background color sheet 16 in the direction of arrow T, and the narrow background color sheet 16 for arrow N.
Cursor key 101c for running in the direction of arrow and cursor key 10 for running the narrow background color sheet 16 in the direction of arrow O.
1d and. In addition, narrow background color sheet 1
6 runs only while the cursor key 101 is pressed.

When the adjacent keys are pressed at the same time, as shown in FIG.
It is possible to drive in a 45 ° direction between the directions of arrows S, T, N and O shown in FIG. For example, Kalsolki-101a
When 101 and 101c are pressed at the same time, the carriage 88 moves in the direction of the arrow N while rotating the roller 89 to move the narrow background color sheet 16 in the direction of the arrow S. The toe 16 travels in the direction of arrow U. Since the other input keys are the same as those in the second embodiment, description thereof will be omitted. Note that FIG. 23 is an explanatory view showing the moving direction of the cursor of the third embodiment.

Therefore, in this embodiment, since the red background 100b and the white background 100c of the narrow background color sheet 16 can be used as the cursor, the sheet guide plate 14 is made black and the first embodiment described above is adopted. Under the transparent image written by the automatic writing unit 19 shown in the example and the second embodiment, red 1
When 00b is brought in, the transparent image in that portion becomes red, and becomes a color different from other black images, so that it can be emphasized. In addition, when the white 100c is brought under the transparent image, the transparent image on the white can be temporarily erased. This makes it ideal for educational purposes. The other structure is similar to that of the second embodiment, and the description thereof is omitted.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to the drawings. The same parts as those in the first, second and third embodiments are designated by the same reference numerals and the description thereof will be omitted. FIG. 24 is an explanatory view showing the structure of the electronic blackboard device of the fourth embodiment, FIG.
FIG. 11 is a partially enlarged plan view showing the structure of the electronic blackboard device of the fifth embodiment. The difference between the first, second and third embodiments of the fourth embodiment is that the background color sheet that can travel in one-dimensional direction is the first background color sheet. In addition to the sheet, a narrow background color sheet that can travel in two dimensions is further provided.

24 and 25, the background color sheet 3 shown in the second embodiment is used as the first background color sheet, and the narrow width shown in the third embodiment is used. The background color sheet 16 is used as a second background color sheet, and this second background color sheet is used.
A first background color sheet 3 is provided between the sheet 16 and the sheet guide plate 14. A transparent sheet guide plate 102 is provided between the second background color sheet 16 and the thermoreversible display medium sheet 2.

Since the transparent sheet guide plate 102 is provided, there is no step between the second background color sheet 16 and the sheet guide plate 14, and the protective layer 2a of the thermoreversible display medium sheet 2 is provided. It becomes easy to write when writing an image. Further, it is not necessary to retract the second background color sheet 16 to the outside of the sheet guide plate 14. Further, by providing the first background color sheet 3 behind the second background color sheet 16, unlike the third embodiment, the thermoreversible display medium sheet 2 is provided.
It is possible to visually check the transparent image written in not only the color of the sheet guide plate 14 but also the desired color of the background color sheet 3.

Next, the operating portion of the fourth embodiment will be described. FIG. 26 is a plan view showing the operating portion of the fourth embodiment.
The operation unit 8 of the fourth embodiment is the operation unit 8 of the third embodiment.
In addition, the background color feed key 74, the background color return key 75, and the background color stop key 76 shown in the first and second embodiments relating to the traveling of the first background color sheet 3 are provided. It is a thing. Since the other points are the same as those in the second and third embodiments, description thereof will be omitted.

In each of the first, second and fourth embodiments, the background color sheet 3 is wound up by two rollers and fed out. However, the endless sheet having a length of two pages is used. It may be in a shape.

[0089]

Since the present invention is configured as described above, it has the following effects. It has a plurality of pages corresponding to one page of the thermoreversible display medium sheet, colors are arranged in page units, and the selected one page is transferred to the back surface of the thermoreversible display medium sheet to give a colored image. By providing the background color support that is visually recognized, the color of the image can be arbitrarily selected according to the operator's preference or purpose.

Further, the automatic writing means and the automatic erasing means are integrally provided with the cleaning means for erasing the image written by the writing instrument, so that the automatic writing means can automatically erase the image before writing the image. Since the surface of the thermoreversible display medium sheet can be cleaned before the image is erased by the means, the surface of the thermoreversible display medium sheet can be always kept clean. Further, since the cleaning means is integrally provided in each of the automatic writing means and the automatic erasing means, the structure is simpler and the number of parts is smaller than that in which the cleaning means is independently provided.

Further, if a silver-colored material having a high reflectance is selected for the color of the background color support, the image written by the automatic writing means has a high reflectance and can be visually recognized as a clear image. .

[Brief description of drawings]

1 is a cross-sectional view taken along the line YY of the apparatus shown in FIG.

FIG. 2 is a perspective view showing the appearance of the electronic blackboard device of the first embodiment.

FIG. 3 is an explanatory diagram showing a configuration of a rotary drum of the first embodiment.

FIG. 4 is a partial cross-sectional view showing a thermoreversible display medium sheet according to the first embodiment.

FIG. 5 is a hysteresis curve of the thermoreversible display medium sheet according to the first embodiment.

FIG. 6 is an explanatory diagram showing a configuration of a background color sheet according to the first embodiment.

FIG. 7 is a plan view showing an operation unit of the first embodiment.

FIG. 8 is a block diagram showing a control system of the electronic blackboard device of the first embodiment.

FIG. 9 is an explanatory diagram showing an automatic write operation and an automatic erase operation according to the first embodiment.

FIG. 10 is a partially enlarged explanatory view showing the automatic write operation of the first embodiment.

FIG. 11 is a partially enlarged explanatory view showing the automatic erasing operation of the first embodiment.

FIG. 12 is an explanatory diagram showing an automatic reading operation of the first embodiment.

FIG. 13 is an explanatory diagram showing another configuration of the background color sheet of the first embodiment.

FIG. 14 is an explanatory diagram showing the structure of the electronic blackboard device of the second embodiment.

15 is a cross-sectional view taken along the line ZZ of the apparatus shown in FIG.

FIG. 16 is a plan view showing an operation unit of the second embodiment.

FIG. 17 is a partially enlarged explanatory view showing the automatic write operation of the second embodiment.

FIG. 18 is a partially enlarged explanatory view showing the automatic erasing operation of the second embodiment.

FIG. 19 is an explanatory diagram showing the structure of the electronic blackboard device of the third embodiment.

20 is a cross-sectional view taken along the line X-X of the apparatus shown in FIG.

FIG. 21 is an explanatory diagram showing the structure of a second background color sheet according to the third embodiment.

FIG. 22 is a plan view showing an operating section of the third embodiment.

FIG. 23 is an explanatory view showing the moving direction of the cursor of the third embodiment.

FIG. 24 is an explanatory view showing the structure of the electronic blackboard device of the fourth embodiment.

FIG. 25 is a partially enlarged plan view showing the electronic blackboard device of the fourth embodiment.

FIG. 26 is a plan view showing an operating portion of the fourth embodiment.

[Explanation of symbols]

 2 Thermoreversible display medium sheet 3 Background color sheet 16 Second background color sheet 19 Automatic writing section 20 Automatic erasing section 30 Cleaning blade 31 Cleaning blade 40 Electronic blackboard device 86 Guide Shaft 87 Guide shaft 88 Carriage

Claims (10)

[Claims] 1. A transparent or opaque thermoreversible display medium sheet is selectively heated by a writing means to write an image or erased by an erasing means, and at the same time a thermoreversible display medium sheet is formed. A large-screen display device in which an image is written by a predetermined writing tool and erased by wiping, has a plurality of pages of a size corresponding to one page of a thermoreversible display medium sheet, and colors are selected for each page and selected. A large-screen display device comprising a background color support on which one page is transferred to the back surface of the thermoreversible display medium sheet and a colored image is visually observed. 2. The large screen display device according to claim 1, wherein the writing means is an automatic writing means, and the erasing means is an automatic erasing means. 3. The large screen display device according to claim 1, wherein the background color is one color, and another strip-shaped colored area of one page or less is provided in the background color. 4. The large screen display device according to claim 3, wherein the automatic writing means and the automatic erasing means are integrally provided with cleaning means for erasing an image written by a writing instrument. 5. The background color support transferred to the back surface of the thermoreversible display medium sheet serves as a first background color support, and the first background color support and the thermoreversible display medium sheet. 3. The large screen display device according to claim 2, further comprising a second background color support smaller than the first background color support that is two-dimensionally moved between the first background color support and the second background color support. 6. A guide shaft provided parallel to the traveling direction of the thermoreversible display medium sheet and a second background color support member are laid across and slidably provided on the guide shaft. A carriage and a traveling means provided on the garage for traveling the second background color support in a direction orthogonal to the traveling direction of the thermoreversible display medium sheet are provided, and a second background color support is provided. The large-screen display device according to claim 5, wherein the large-screen display device is moved dimensionally. 7. The large screen display device according to claim 6, wherein the automatic writing means and the automatic erasing means are each integrally provided with a cleaning means for erasing an image written by a writing instrument. 8. A transparent or opaque thermoreversible display medium sheet is selectively heated by a writing means to write an image or erased by an erasing means, and at the same time, a thermoreversible display medium sheet is formed. In a large-screen display device in which an image is written by a predetermined writing tool and erased by wiping, a colored pedestal is provided on the back surface of the thermoreversible display medium sheet, and the pedestal and the thermoreversible display medium sheet are provided. A large-screen display device, characterized in that a background color support having a plurality of colored regions and a transparent portion, which moves two-dimensionally between and, is provided. 9. A guide shaft provided parallel to the traveling direction of the thermoreversible display medium sheet, and a carriage provided with a background color support member and slidably provided on the guide shaft. And a traveling means for traveling the background color support in a direction orthogonal to the traveling direction of the thermoreversible display medium sheet, which is provided in the garage to move the background color support two-dimensionally. The large screen display device according to claim 8. 10. An automatic writing means and an automatic erasing means, respectively, for clearing an image written by a writing instrument.
The large-screen display device according to claim 9, wherein the large-scale display unit is integrally provided.