JPS63221374A - Electronic blackboard - Google Patents

Abstract

PURPOSE:To enable high-speed display of a high-quality magnified image by reading an image written on the surface of a recording medium, copying its content, and further forming on the surface of the recording medium a toner image obtained by magnifying said read content. CONSTITUTION:The image is written with a felt pen or the like on the writing medium 6 obtained by laminating a resin film on a polyester sheet of an electrically driven endless belt, and it is read by a first reading device 11, once memorized in RAM, recorded in a reduced size by a recording device arranged on the backside. On the other hand, the read content is again read by the image scanner of a second reading device arranged on the front side, a light source of laser beams is controlled to form the magnified latent image of said content on a photosensitive drum 20, said image is developed with a toner developing device 22 and transferred onto the medium 6, thus permitting the magnified high-quality image of said content to be displayed at high speed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic blackboard that has the function of copying the content written on the blackboard as well as the function of enlarging and displaying hand-held materials on the blackboard surface. It is.

[Prior Art] In addition to the function of copying the content written on the blackboard, the electronic blackboard has the function of enlarging and displaying hand-held materials on the blackboard surface.
For example, it is already known as shown in Japanese Patent Application Laid-Open No. 60-263557. According to such an electronic blackboard, the content written on the blackboard can be copied later, so there is no need to take notes, and on the other hand, the materials on hand can be enlarged and displayed as appropriate, so there is no need to overdo it in meetings, etc. It has the advantage of not having to prepare a projector or wall drawings in advance, and can be said to be very useful.

[Problems to be Solved by the Invention] However, the electronic blackboard disclosed in the above publication has felt-tip pens placed facing each other on the surface of a movable sheet-like writing medium, and it is difficult to enlarge and display hand-held materials on the blackboard surface. If desired, the document, etc. is read by a separately provided image reading device and the image data is sent to the felt-tip pen, so that the felt-tip pen runs on the surface of the writing medium and an enlarged image is created on the surface of the writing medium. It is recorded in a serial plot format. Therefore, the electronic blackboard disclosed in this publication has drawbacks such as slowness due to the plotting method using felt-tip pens, poor resolution, and unclear outlines of enlarged images.

[Object of the Invention] The present invention has been made in view of such conventional drawbacks, and its purpose is to provide a copying function for contents written on a blackboard and an enlarged display of hand-held materials on the blackboard surface. To provide an electronic blackboard which is equipped with the following functions and can quickly display an enlarged image with excellent screen quality on the blackboard surface.

[Means for solving the problem] In order to achieve this object, the electronic blackboard of the present invention includes a writing medium using a felt-tip pen or the like, and a first screen that reads characters, figures, etc. written on the surface of the writing medium. a reading means, a means for copying the content read by the first reading means, a second reading means for reading hand-held materials, etc.;
means for enlarging and displaying the content read by the second reading means on the surface of the writing medium; as the enlargement display means, an electrostatic image forming body is disposed opposite to the surface of the writing medium; means for embodying the content read by the second reading means on the surface of the electrostatic image forming body as a toner image; and means for transferring the toner image embodied on the surface of the electrostatic image forming body onto the surface of the writing medium. The main point is that it is prepared.

[Function] With such a configuration, according to the electronic blackboard of the present invention, the content written on the writing medium surface can be read by the first reading means, and a copy thereof can be obtained, as well as hand-held materials, etc. By causing the second reading means to read the toner image, the toner image on the enlarged screen is transferred to the surface of the writing medium via the electrostatic image forming body and displayed.

[Example] Hereinafter, an example of an electronic whiteboard embodying the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, this electronic blackboard has a rectangular chassis frame 1 with an open front, a pair of support legs 2 and a pen tray 3 at the bottom of the chassis frame 1.
A pair of upper and lower sheet drive rollers 4 and a driven roller 5 are rotatably arranged within the chassis frame 1 at a predetermined interval, and an endless sheet-like writing medium 6 is stretched between the two rollers. has been done. A motor 7 is connected to the sheet driving roller 4 via a motor shaft 8, a timing belt 9, and a pulley 10. In addition,
The writing medium 6 used is a polyester sheet base material laminated with a Teflon resin film or thinly coated with a chemical-resistant resin.

On the other hand, a first reading element 11 is provided in the middle of the contact part in the chassis frame 1, and when an image of characters, figures, etc. written on the writing medium 6 is irradiated with fluorescent light 12,
The reading element 1 via a reflecting mirror 13 and a lens 14
Read by 1. Then, the image read by the reading element 11 is reduced and copied onto a predetermined sheet of paper by a recording device 15 provided on the back side of the chassis frame 1, and the sheet is placed on a paper tray 16 provided at the bottom of the recording device 15. It is configured to be discharged. Furthermore, an image scanner 1 that reads images of hand-held documents, etc.
7 is provided on the lower edge of the chassis frame 1, and when a document is inserted into the insertion slot 18 of the image scanner 17, images such as characters and figures on the surface of the document are transferred to the image scanner 1.
7 is adapted to be read by a second read element (not shown). Note that the document is configured to be discharged onto a paper tray 19.

In the first embodiment of the present invention, as shown in FIG. They are arranged opposite to each other over the entire width of the medium 6 surface.

The photoreceptor drum 20 includes a charger 21, a toner developer 22, a transfer corotron 23 for transferring the toner image formed on the surface of the photoreceptor drum 20 by the toner developer 22 onto the writing medium 6, and a static eliminator. 24, and a cleaner 25 for removing residual toner on the surface of the photosensitive drum 20. Further, in order to transmit the content read by the second reading element to the surface of the photosensitive drum 20 as optical information, an optical system consisting of a laser light source 26, a polygon mirror 27 for scanning laser light, a lens 28, and a reflecting mirror 29 is provided. A system is set up. Note that this photoreceptor drum 2
0 is a conductive rotating body made of aluminum or steel, and on the outer circumferential surface, elements such as sulfur and selenium, selenium alloys such as selenium-tellurium and selenium-arsenic, zinc oxide, cadmium sulfide, etc. are used as photosensitive materials. The photosensitive material is coated with an inorganic pigment such as titanium chloride and an organic pigment such as phthalocyanine, and this photosensitive material is a charged particle and has properties as a photoconductor.

Note that a cleaner 30 is provided within the chassis frame 1 for erasing images drawn on the six surfaces of the writing medium.

FIG. 3 shows a control circuit of the electronic whiteboard device constructed in this manner. To explain according to this, central processing bag @ (hereinafter C
PLJ) supervises the entire control, and its CPtJ has R.
An OM and a RAM for appropriately storing read image information are connected. The ROM stores programs and the like for controlling the overall operation of the electronic blackboard. Said CPIJ
is connected via an input interface to a first reading device, a sheet position detector installed in the chassis frame 1, an operation panel that commands movement of the writing medium 6, and reduction/enlargement display of records, and then output to the CPU. A reduction recording device 15 and an image scanner 17 via an interface.
, the writing medium moving motor 7, and the photosensitive drum rotation motor, and various drive and stop signals are outputted to them from the CPU.

However, according to the electronic blackboard configured in this way, it is possible to write letters, figures, etc. on the surface of the writing medium 6 with a marking pen, and to arbitrarily erase the letters, figures, etc. with an eraser. If you wish to copy images such as characters and figures written on the writing medium 6, the motor 7 is rotated by operating the button switch and the button for specifying the desired number of copies on the operation panel. The writing medium 6 moves around in the direction of the arrow in FIG. Copied in reduced size above. At the same time, the image information read by the first reading element 11 is temporarily stored in the RAM, and based on the stored image information, the recording device 5 copies copies for the specified number of schools.

On the other hand, if you want to enlarge and display the documents you have on the writing medium 6, insert the documents into the re-image scanner 17 through the insertion slot 18, and the images of characters, figures, etc. on the document surface will be displayed on the image scanner 17. is read by a second reading element within. Based on the read image information, the laser light emitted from the laser light source 26 is converted into an optical signal, and after this optical signal is scanned by the polygon mirror 27, it is irradiated onto the surface of the photoreceptor drum 20. Therefore, of the entire area previously charged by the charger 21 on the surface of the photoreceptor drum 20, the exposed area loses charge, and static charges remain in the unexposed area, thus creating an electrostatic latent image. . Next, charged toner is attached to the electrostatically charged area of this electrostatic latent image by the toner developing device 22 to form a toner image.

At this time, the toner is charged by a magnetic brush or the like and adheres to the photoreceptor drum 20 due to electrostatic attraction (Coulomb force). This toner image is then transferred onto the writing medium 6 by a sufficiently strong corona discharge generated by the transfer corotron 23. After the photosensitive drum 20 has been transferred, the static electricity is removed by a static eliminator 24, and the residual toner is removed by a cleaner 25. By repeating such a process, the image is enlarged and recorded on the writing medium 6. The image enlarged and recorded on the writing medium 6 appears on the blackboard surface as the writing medium 6 is fed by the drive of the motor 7. Note that the toner images on the six sides of the writing medium are attached by electrostatic attraction.
After this enlarged image is used, it is sent to the back side by the drive of the spear motor 7, erased by the cleaner 30, and used repeatedly. Further, in the present invention, since the image recorded on the writing medium 6 is not fixed, this image can be arbitrarily erased with an eraser and corrected with a marking pen, and the corrected content can be transmitted to the first reading element. 11 is of course possible with the above configuration.

In the present invention, the writing medium 6 has been explained as being endless for ease of explanation, but it can also be applied to a structure in which the writing medium 6 is wound up in a sheet having about five screens to increase the number of recording screens.

In the above embodiment, an optical scanning device composed of a laser light source 26, a polygon mirror 27, etc. is used as a means for forming an electrostatic latent image on the surface of the photoreceptor drum 20, but in addition to this means, for example, although not shown, On the surface of the photoreceptor drum 20, an exposure light source and a liquid crystal screen that converts the light emitted from the light source into a signal by transmitting or blocking, or an LED array that selectively emits light for exposure are arranged facing each other, and these shutters The electrostatic latent image may be formed on the surface of the photoreceptor drum 20 by opening and closing the photoreceptor drum 20 based on the image information sent from the second reading element, thereby irradiating or blocking light onto the surface of the photoreceptor drum 20.

Next, FIG. 4 shows yet another embodiment of the present invention.

As for the structure, the photosensitive drum 20 in the first embodiment
Although the laser exposure system is changed to a dielectric drum 33 and an electrostatic multi-stylus head 34, there are some holes in principle. Basically, this method leaves gaseous ions as an electrostatic latent image on the film of the dielectric drum 33 by electric discharge, and converts this into a visible image using toner, resulting in 196 recorded images. To explain this process, first, a dielectric drum 33 coated with a dielectric material of about 20 μm is uniformly charged by daily discharge from a charger 35. Next, a pulse voltage of opposite polarity to that of the already charged voltage is applied to the multi-stylus head 34 (multi-sided electrode), which is a recording electrode held at a distance of 10 to 20 μm from the drum surface of the corona dielectric drum 33, to cause discharge. (potential difference between them is 500 to 600 V). This removes or reduces the existing charge and creates an electrostatic latent image. Next, as in the first embodiment, the writing medium 6 is developed and transferred toner.
to be recorded. In such an apparatus, compared to the first embodiment, the life of the dielectric band drum 33 is longer than that of the photoreceptor drum 20, and a multi-stylus is used instead of using an expensive laser exposure system using a polygon mirror 27 and a lens 28. It can be said that the head 34 is more advantageous in terms of cost. It should be noted that in such document reading and enlarged display, the magnification factor of the character image with respect to the document is desirably a magnification factor that is assumed to be a substitute magnification factor for OHP or the like.

[Effects of the Invention] As explained above, the electronic blackboard according to the present invention has both the function of copying the content written on the blackboard surface and the function of enlarging and displaying hand-held materials, etc. on the blackboard surface. In addition to the fact that the enlarged display is done almost simultaneously with the reading of the documents in hand and at high speed using an electrostatic image forming body such as a photoreceptor drum or dielectric drum, it speeds up meetings, etc. High efficiency can be achieved. In addition, since the enlarged display is performed after toner is applied to the electrostatic image and the toner image is transferred to the writing medium, a high quality image similar to electrophotographic close-up is produced and OHP (
It is a high-performance alternative that exceeds functionality as a replacement for the Overhead Rad projector.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an electronic whiteboard according to an embodiment of the present invention, FIG. 2 is a perspective view of its external appearance, FIG. 3 is an electronic control block diagram of this electronic whiteboard, and FIG. 4 is a diagram of another embodiment. FIG. 3 is a cross-sectional view of the electronic blackboard. 6... Writing medium, 11... First reading element, 15
... Recording device, 17... Image scanner, 22.
... Toner developer, 23 ... Transfer 77 ] Rotron, 2
6... Laser light source, 27... Polygon mirror, 31
...Manuscript, 32...Lighting light, 33...Dielectric drum, 34...Multi stylus head.

Claims (1)

[Scope of Claims] 1. A writing medium that can be written with a felt-tip pen or the like, a first reading means for reading the screen of characters, figures, etc. written on the surface of the writing medium, and a reading means for reading by the first reading means. a second reading means for reading hand-held materials, and a means for enlarging and displaying the content read by the second reading means on the surface of the writing medium, the enlarged display means an electrostatic image forming member is disposed opposite to the surface of the writing medium, and means for embodying the content read by the second reading means as a toner image on the surface of the electrostatic image forming member; An electronic whiteboard comprising means for transferring the toner image embodied on the surface of the image forming body onto the surface of the writing medium. 2. The electronic whiteboard according to claim 1, wherein the electrostatic image forming body is a photosensitive drum. 3. The electronic whiteboard according to claim 1, wherein the electrostatic image forming member is a dielectric drum.