JPH01966A - electronic blackboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic blackboard that can be used in a wide range of applications such as meetings, presentations, and bulletin boards. This invention relates to an electronic blackboard that can be easily modified and added to.

[Summary of the Invention] The present invention provides an electronic blackboard in which original image information such as documents can be input and written on a blackboard sheet, and the blackboard sheet is provided with a chargeable dielectric film,
A compact system comprising: an input means for document information; a charging means for charging the input document information on the blackboard sheet to form a latent image; and a developing means for adsorbing, semi-fixing or fixing toner on the latent image. By displaying document information such as documents on a blackboard sheet at high speed and making it easy to wipe off by adjusting the degree of fixation as necessary, we have improved operability and handling so that it can be used for a wide range of purposes such as meetings, presentations, and bulletin boards. It is made easy.

[Prior Art] Electronic blackboards for meetings have been known that have a function of hard copying handwritten characters on the blackboard. With this electronic blackboard, even if you create a draft on paper, you have to copy it by hand onto the blackboard and discuss it again, and even if you can print out the draft when the meeting ends midway,
The next time, I had to handwrite the same thing again.

Therefore, in Japanese Patent Application Laid-Open No. 6i233597, an electronic blackboard is equipped with a document reading device, a thermal head, and an ink film, and the document information is read, and the ink on the thermal ink film is thermally transferred to the blackboard sheet by the thermal head. A writing-type electronic blackboard on which information can be written has been proposed.

[Problems to be Solved by the Invention] However, the conventional thermal transfer type electronic whiteboards described above have the following problems in terms of operability and handling.

(1) The writing speed is slow due to thermal transfer, which is inconvenient as meetings and the like are interrupted, and its uses are limited.

(2) The use of a thermal head and a long thermal ink film increases the size of the device.

(3) With heat-sensitive ink films, the number of writable screens on each roll is small, and the work to replace them is lengthy and difficult.

(4) Thermal transfer ink was firmly fixed on the blackboard sheet and was difficult to wipe off, making it difficult to correct the written information.

The present invention was devised to solve the above-mentioned problems, and it is an object of the present invention to provide a writing-type electronic blackboard that can be constructed in a small size, has a fast writing speed, has good operability, and is easy to handle. With the goal.

[Means for Solving the Problems] The structure of the electronic blackboard of the present invention for achieving the object described in 2. includes a blackboard sheet having a chargeable dielectric film, a means for inputting manuscript information, and a means for inputting the input manuscript. The present invention is characterized in that it includes a charging device that charges information to the blackboard sheet to form a latent image, and a developing device that attracts, semi-fixes, or fixes toner to the latent image.

[Function] The present invention charges and forms a latent image of input document information on the dielectric film of a blackboard sheet using a charging means using high voltage, and causes toner to be attracted to this latent image by a developing means.
Alternatively, if necessary, develop by semi-fixing or fixing with heat or the like. The surface of the blackboard sheet has a smooth surface on which written characters can be wiped off as in the past, and the degree of fixation of toner to the latent image of the original information written by the above development can be adjusted as necessary. This makes modification easier.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram of an electronic blackboard showing an embodiment of the present invention. This embodiment shows a case where the present invention is applied to a vertically running roll type electronic blackboard in which the blackboard sheet moves in the vertical direction. The mechanism portion in FIG. 1 shows a schematic configuration seen from the side.

The electronic whiteboard device of this embodiment is configured as follows.

A blackboard sheet 1, which will be described later, is formed to have the required number of screens in the vertical direction. One end is wound around an upper roll 2, the other end is wound around a lower roll 3, and the blackboard sheet 1 is moved vertically by a blackboard drive motor (not shown) or the like. The roll 2 or 3 is rotated while being tensioned in the direction to position the required screen.

The electrostatic head 4 has a write electrode 4a and a control electrode 4b as described later, and forms a latent image by charging the blackboard sheet I with the write electrode 4a according to write information from the control unit 5. do. This electrostatic head 4 is an example of the charging means of the present invention. The developing means 6 consists of a toner container 7, a developing roll 8, a fixing lamp 9, etc., and an electrostatic head 4. Developing roll8. The fixing lamps 9 are arranged in this order, and the toner adsorbed on the developing roll 8 is adsorbed to the latent image formed on the blackboard sheet I, and the intensity of the far infrared rays of the fixing lamps 9 is adjusted as necessary to use the heat. Make the toner semi-fixed or fixed.

The document information input means If is a document feed roller 12, 12, 1 provided near the document insertion port 11a and document discharge port 11b.
2.12, a reading optical system I3, a scanner 14, etc., and while feeding the document inserted through the insertion slot +1a, the scanner I4 reads it, converts it into an electrical signal, and sends it to the control section 5.

The control unit 5 creates write information for the electrostatic head 4 by binarizing or quantizing the electrical signal.

The recorded content displayed with toner on the blackboard sheet l or the recorded content written by hand is printed out by the thermal printer section 15. A blackboard sheet for that! The reading means consists of an illumination lamp 16 that illuminates the winding surface of the upper roll 2, an optical system I7 that focuses the recorded contents, a scanner 18, etc., and reads the recorded contents with the scanner 18 while winding up the blackboard sheet 1. The thermal printer section reads it and converts it into an electrical signal! Send to 5. The thermal printer unit 15 binarizes or quantizes this, prints it out, and discharges it.

FIG. 2 is a perspective view showing an example of the appearance of the electronic blackboard of this embodiment. The whole body is covered with a cover 19, except that the writing section for one screen of the blackboard sheet L appears on the front side, and the lower part of the face has a document insertion opening 11a, an output opening 11b, and a printout of recorded contents Dl5. Provide a. It is preferable that the legs 20 are provided with casters 20a to allow them to move freely.

FIG. 3 is a sectional view showing an example of the structure of the blackboard sheet 1. As shown in FIG. Blackboard sheet I is made of polyvinylidene fluoride (PV) from the writing side.
A conductive film formed using a dielectric film 1a such as F, ) and polyurethane as a base material! b and a reinforcing sheet 1c made of vinyl chloride or the like, each of which is laminated or adhered. The higher the dielectric constant of polyvinylidene fluoride of the dielectric film 1a, the more it can be charged at a low voltage. Therefore, it is preferable that it is uncolored, transparent, and as thin as possible. It is preferable to add zinc oxide (Zno), titanium oxide, titanium, etc. as a conductive material to the polyurethane of the conductive film 1b, and to mix titanium oxide as a white pigment to form a white sheet. In addition,
If the reinforcing sheet lc has electrical conductivity, this electrically conductive film layer can be omitted.

Another example of the material for the dielectric film 1a is polyethylene terephthalate (PET).

FIG. 4 is a plan view showing the first embodiment of the electrostatic head. This embodiment is of a multi-stylus type, and the write electrode 4a is formed by electrode needles arranged in a staggered manner, which are collectively molded.

Control electrodes 4b having a large area ratio with respect to the write electrodes 4a are arranged on both sides of each group of a certain number (for example, 32 electrodes) of electrode needles in a staggered arrangement. However, the write electrodes do not necessarily have to be arranged in a staggered manner, and may simply be arranged in a row.

FIGS. 5A and 5B are a side view (A) and a partial plan view showing a second embodiment of the electrostatic head.

This example is a flexible print sheet 4c.

4c', the write electrode 4a and the control electrode 4b are formed of copper foil, and the surface thereof is hard chrome plated to improve wear resistance.

FIG. 6 is a perspective view of a third embodiment of the electrostatic head. In this embodiment, the control electrode 4b is connected to the direction reversing guide 10 described above.
The opposing write electrode 4a may be of the aforementioned multi-stylus type or flexible printed sheet type.

The electrostatic head 4 shown in FIGS. 4 and 5 has a write electrode 4a and a control electrode 4b arranged on the writing surface of the blackboard sheet 1, but in this embodiment, the write electrode 4a is Although the control electrode 4b is arranged on the front surface, the control electrode 4b is arranged opposite to the back surface of the blackboard sheet I. Therefore, by using a blackboard sheet with a high dielectric constant, the conductive film 1b in the blackboard sheet l described above can be omitted.

FIG. 7 is a block diagram showing the configuration of a control section that controls writing by the electrostatic head. The control unit 5 includes a processor (CPU) 2I that receives an electrical signal of document information from the scanner 14, performs quantization such as binarization, and creates writing information for each line, and a switching circuit 22 that changes the writing information of the line. The four one-line memories 23a, 23b, 23c, and 23d are switched and stored using the switching circuits 24 and 25, and the write information of the odd and even dot rows in a staggered arrangement is simultaneously written from the memory where the storage has been completed. Encoder (FC) 2 of readout blackboard drive motor 26
A processor (CPU) 27 that performs write control on the electrostatic head 4 in synchronization with a synchronization signal from the electrostatic head 4, etc.
The drive circuit 28 is configured to drive the drive circuit 28 and the like. Figure 4.

If the write electrodes of the electrostatic hept 4 are in a staggered arrangement spanning three lines as shown in Figure 5, it is necessary to save the data up to the previous three lines, and in addition to this, the data for the preceding l line must be saved. As mentioned above, memories 23a, 23b, 23c, 23d for a total of 4 lines are required.
However, if it is a -column array, two lines of memory are sufficient.

Generally, in the case of a staggered arrangement spanning n lines, memory for (n+B lines) is required.The memory switching order is controlled as shown in the table below, for example.

That is, the processor 27 reads the first data from the memory 23b, for example.
Read out the odd numbered dots on the line, read out the even numbered dots on the third line from the memory 23d, and read out the even numbered dots on the third line. line and the third
While controlling the writing of the line, processor 2
1 stores the write information of the next fourth line in the memory 23a to eliminate waiting time. The timing to start the next storage is notified by sending an input request signal after the processor 27 finishes reading the write information in the memories 23b and 23d.

In the above configuration, if the processor 21 is provided with an external storage device such as a floppy disk 29, it is possible to store manuscript information, or the recorded contents of the blackboard sheet can be recorded on the floppy disk provided on the thermal printer section 15 side. , save it to a floppy disk 2 at your next meeting, etc.
It is also possible to input and write from 9. Also, processor 2! If a communication means 30 is provided in the system so that writing information can be input from a remote location, the system can also be used for video conferencing.

FIGS. 8(a) and 8(b) are explanatory diagrams of write control by the control section. (A) shows a circuit diagram of one column of the staggered arrangement, and (B) is an explanatory diagram of write timing. The write electrodes 4a+4at...4an are grouped into groups of a predetermined number (for example, 16 electrodes), and each is connected to 16 write data buses.

On the other hand, the control electrodes 4b+4by...4bn are connected to individual control electrode selection lines (2), (2) to (n). With the above connection, write control is performed in a so-called time-division drive. That is,
First, a high voltage is applied only to the write line of the write electrode 4b on the write data bus and the control electrode selection line ■ to charge the write electrode 4b, and then the control electrode selection line ■
Charging is performed by the write electrode 4b and the write electrode 4b, and thereafter, charging of one line is similarly performed by switching between the write information of the write data bus and the control electrode selection line. The other column of the staggered arrangement is also connected with circuits similar to those described above, and time-division driving is performed between the circuits between the one column and the other column to improve resolution.

The operation of the embodiment configured as above will be described.

When writing with the electrostatic head shown in FIGS. 4 and 5, when a voltage of, for example, 600 V DC is applied between the write electrode 4a and the control electrode 4b, the write electrode 4a-dielectric film l&-conductivity! I
A type of capacitor series circuit is formed: lb -> dielectric film fa - control electrode 4b. Here, since the write electrode 4a is very small compared to the control electrode 4b, the conductive film 1b is charged almost only on the write electrode 4a side. It is possible to form with high resolution by split driving. Moreover, since charging is instantaneously performed simply by applying a high voltage, it is possible to form a latent image at high speed.

On the other hand, this latent image is developed by attracting the toner magnetically attracted to a developing roll 8 rotatably mounted around the outer periphery of a magnetic core by the electrostatic force of the charges forming the latent image. This adsorption can also be performed at high speed. After development, if necessary, the developing surface is irradiated with far infrared rays by a fixing lamp (a heat roll or the like) 9 to soften the toner and fix it. At this time, the intensity of the irradiated light is controlled to fix the toner. control the degree of of course,
It is not necessary to fix the image, and in that case, the fixing lamp 9 is not necessary. If the toner remains attracted by electrostatic force, the written image can be wiped off most easily, and semi-fixing or fixing is then performed depending on the usage situation. Replenishment of this toner is relatively simple, and it is possible to develop a large number of screens with just one replenishment. Further, the toner may be a powder or a liquid, and may be electrically charged.

Since writing can be performed at high speed as described above,
It does not interrupt the flow of meetings or explanations, and can be used instead of an overhead projector (O)IP, for example. Moreover, 011P can be used with its quality and brightness, additions and corrections can be made freely, and the original can be plain paper without using special sheets.

The surface (writing surface) of the blackboard sheet l is made of polyvinylidene fluoride, which can form a smooth area with low affinity for ink, etc., so even semi-fixed toner images can be easily erased. You can easily write on it or erase it by wiping it with a cleaner. Therefore,
For example, write only the title and frame from the manuscript,
You can create meetings by handwriting and going there.

In addition, in the above embodiment, the blackboard sheet may be horizontally moved by moving left and right, or may be wound endlessly. It can also be used for rewritable advertisements and announcements in stations and city windows; in this case, it may be of a write-only type.

In this way, the present invention can be applied and implemented in various ways in accordance with its gist.

[Effects of the Invention] As is clear from the above description, the electronic blackboard of the present invention provides the following effects.

(1) The writing speed can be increased to 5 to 6 times that of conventional thermal transfer, improving operability and broadening the range of applications.

(2) Additions and corrections to written manuscript information become easier, and meetings can be created.

(3) Since there is no ink film, the toner can be miniaturized, and the toner can be easily replaced, and it can be used for a long time with just one replacement, making it easy to handle.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an electronic blackboard showing an embodiment of the present invention, Fig. 2 is a perspective view showing its external appearance, Fig. 3 is a sectional view of a blackboard sheet, and Fig. 4 is a diagram of the first electrostatic head A plan view showing the embodiment; FIGS. 5A and 5B are views showing a second embodiment of the electrostatic head; FIG. 6 is a perspective view of the third embodiment of the electrostatic head;
Figure 7 is a block diagram showing the configuration of the control section, Figure 8 (a)
, (b) are explanatory diagrams of write control. ■...Blackboard sheet, la...Dielectric film, 4...Electrostatic head (charging means), 6...Developing means, 11...Input means. 1shiη! Is r on the sheet 1 cup diagram 3rd blue? First fire example of snow head Figure 4 (a) (b) Bay P Fung head's second central pshi 4th row Figure 5 (a) L-C〕l Kiichi −−−−−−−−−
1te 2ri (b) Mamoru 3mi! 12S Mi, 5 men, 8 kidneys, 1 light Preface Figure 8 Procedural Amendment (Salmon) August 19, 1986

Claims (1)

[Scope of Claims] A blackboard sheet having a dielectric film that can be charged; a means for inputting document information; a charging means for charging the input document information on the blackboard sheet to form a latent image; An electronic whiteboard comprising a developing means for adsorbing, semi-fixing or fixing toner.