JPH0542191B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is an image display that can display image information written on paper on a board, and can also print image information displayed on the board on paper. It is related to the device.

<Prior Art> In recent years, an electronic blackboard that can copy images written on the board has been proposed in place of the conventional blackboard. This is an image handwritten with a felt pen on something like a white board, read by an image reading device, and printed out by a printing device, which is convenient because the operator does not have to transfer the image written on the board to a notebook, etc. It is.

An overhead projector (hereinafter referred to as OHP) has also been proposed as a device that simultaneously transmits information from pre-prepared materials to a large number of people. This uses light to magnify and project information printed on a transparent sheet onto a screen, and it is convenient because it allows for instructions to be given when explaining materials, and there is no need to distribute materials in advance. be.

Furthermore, in Japanese Patent Publication No. 57-27463, a magnetophoretic display board that uses magnetophoresis to display images has been proposed.

<Problems to be solved by the invention> However, with electronic blackboards, in order to convey pre-prepared materials to a large number of people, it is necessary to transcribe the materials by hand on the electronic blackboard, or to transfer the materials in advance to a large number of people. It was necessary to make copies and distribute them.

In addition, with OHP, it was not possible to copy and distribute the projected image, the original was required to be made on a transparent sheet, and since it was an optical projection, the venue had to be darkened, among other problems.

Furthermore, in the case of the above-mentioned magnetophoretic display device, if you want to rewrite the image information displayed on the display device, you must completely erase the image information using the erasing head and then display new image information. Therefore, there is a problem that it takes time to rewrite the image information.

The present invention was made in view of these problems, and is disclosed in Japanese Patent Application Laid-open No. 48-56393 and Japanese Patent Publication No. 57-27463.
The image information written on the manuscript can be displayed on the board by using the principle of the magnetophoretic display method, which is described in the above publication and which applies a magnetic field to a plastic fluid in which magnetic molecules are dispersed to display information using magnetic force. An object of the present invention is to provide an image display device that can display image information on a board and print image information displayed on a board on paper.

Another object of the present invention is to provide the image erasing means at a position preceding the image recording means in the image information writing direction, so that the image information can be recorded immediately after erasing, and the image information can be rewritten. The goal is to be able to do it quickly.

<Means for Solving the Problems> The image display device of the present invention includes a plastic fluid in which magnetic particles are dispersed, and displays image information by applying a magnetic field and using magnetic force. a recording means for recording the image information by causing magnetic particles of the display means to migrate toward the display surface of the display means using magnetic force; an erasing means, which is provided at a position preceding the means, and erases at least a part of the image information by causing magnetic particles of the display means to migrate to the back side of the display surface of the display means by magnetic force; The display means is scanned before the recording means.

<Function> In the image display device of the present invention, since the image erasing means scans the image display means before the image recording means, new image information can be displayed immediately after erasing the image information. can.

<Example> A detailed explanation will be given below based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the image display device of the present invention. In the figure, 1 is a board for reading, writing, and erasing image information.
The board 1 includes a magnetophoretic display panel 3, a magnetic recording head device 4 for displaying (writing) information on the magnetophoretic display panel 3, and a magnetic recording head device 4 for erasing information displayed on the magnetophoretic display panel 3. The magnetic erasing head device 5 includes a magnetic erasing head device 5, and a board surface reading device 6 for reading information displayed on the magnetophoretic display board 3.

Reference numeral 7 denotes a document reading device for reading image information written on paper, and 8 a recording device for printing out (hard copy) the information read by the board surface reading device 6 or the document reading device 7.

Further, 9 is a control device for controlling each device of this image display device, and 10 is an operating device for operating this image display device.

An example of the structure of the magnetophoretic display panel 3 will now be described in detail with reference to FIG. 2.

11 is a special plastic liquid in which magnetic particles 12 are dispersed; 13 is a back sheet; and 14 is a top sheet; the back sheet 13 and the top sheet 14 are partitioned by a honeycomb core 15; A plastic liquid 11 is contained therein. By causing the magnetic particles to migrate in the plastic liquid 11, image information is displayed or erased.

Reference numeral 16 denotes Teflon-treated scraps obtained by subjecting the top sheet 3 to a display treatment using, for example, Teflon, and is provided to provide the function of a whiteboard.

The plastic liquid 11 is a liquid that does not flow unless an external force of a certain level or more is applied, and the magnitude of the force corresponding to this certain external force is called a yield value. Now, when a magnetic force m greater than the above-mentioned yield value is applied from the outside of the magnetophoretic display panel 3, the magnetic particles 12 dispersed in the magnetic liquid 11 move in the direction of the applied magnetic force. Therefore, by applying magnetic force alternately from the front sheet 14 side and the back sheet 13 side of the magnetic panel in this way, the magnetic particles 12 move to the front sheet 14 side and the back sheet 13 side, making it easy to display and erase. be able to. That is, in the magnetic recording head device 4, the top sheet 1 of the magnetophoretic display panel 3 is
When a magnetic force is applied from the 4th side, magnetic particles migrate to the surface, allowing an image to be displayed. Also, the erase head device 5
By applying a magnetic force from the back sheet 13 side of the magnetophoretic display panel 3, the magnetic particles 12 migrate to the back surface and the image is erased. Also, Teflon treatment waste 1
In order to use the magnetophoretic display board 3 as a white board, 6 was applied in consideration of the adhesion of pigment to the board surface, the ease of wiping it, and the durability of the board surface. and can be easily erased.

As shown in FIG. 3, the magnetic recording head device 4 connects a plurality of electromagnet groups 17, 17, . . .
It is arranged so that it comes into face-to-face contact with the magnetophoretic display board 3, and moves relative to the magnetophoretic display board 3.In order to form characters and images on the magnetophoretic display board 3 like a general dot drawing printer, individual electromagnets are used. 17 is selectively driven. If the dot density of the magnetophoretic display plate 3 is set to, for example, 1 dot/mm, the electromagnet group 17
Although it is necessary to arrange the dots at a pitch of 1 mm, it is also possible to achieve equalization of 1 dot/mm by arranging them as shown in FIG. 4 due to the shape constraints of the electromagnet 17.

The magnetic erasing head device 5 is located on the back sheet 13 side of the magnetophoretic display panel 3, and is structurally similar to the magnetic recording head 4, and erases the area to be erased by selectively driving individual electromagnets. It is something that As another embodiment of the magnetic erasing head device 5, it is also possible to erase by bringing a permanent magnet into contact with an arbitrary area.

As shown in FIG. 5, the board surface reading device 6 includes a light source 18 that irradiates light energy to the surface sheet 14 side of the magnetophoretic display board 3, and a light source 18 that irradiates light energy to the surface sheet 14 side of the magnetophoretic display board 3, and a light source 18 that irradiates light energy reflected from the light and shade of the image drawn on the magnetophoretic display board 3. It is composed of a lens 19 that focuses light, and a photoelectric conversion element 20 (hereinafter referred to as CCD) that converts the intensity of the focused light into an electrical signal.

The magnetic recording head device 4, the magnetic erasing head device 5, and the plate surface reading device 6 may be provided as separate devices, or they may all be mounted on one carriage and formed integrally.

FIG. 6 shows a carriage in which a magnetic recording head device 4, a magnetic erasing head device 5, and a plate surface reading device 6 are all mounted. A is a line-type carriage, which allows for simple scanning (movement) of the head, and the speed at which one screen can be drawn is fast. However, there are problems in terms of power consumption and cost. On the other hand, b is a serial type carriage that scans (moves) because it has a small number of elements.
is complicated and takes a long time to draw, but the power consumption and
There are advantages in terms of cost. Which method to use may be selected appropriately depending on the size of the device, purpose of use, etc.

Next, the erasing operation of the magnetophoretic display panel 3 will be described in detail.

The magnetic erasing head device 5 can be configured to erase the entire surface of the magnetophoretic display panel 3 from the back sheet 14 side, but it is impossible to erase a part of it.
Furthermore, rewriting a portion requires erasing the entire surface and then rewriting the entire surface as new content, including portions that do not need to be rewritten, which takes time.

Therefore, the magnetic recording head device 4, the magnetic erasing head device 5, and the plate surface reading device 6 are installed in the same carriage 2.
1, and a magnetic erasing head device 5 is provided at a position preceding the magnetic recording head device 4 with respect to the traveling direction during writing and on the back sheet 14 side of the magnetophoretic display panel 3.

Accordingly, in the erasing operation, the magnetic recording head device 4 is moved to the back sheet 14 side of the area of the magnetophoretic display panel 3 where erasing is desired, and the electromagnets in the area to be erased are selectively energized.

Furthermore, in the rewriting operation, in addition to the above-mentioned erasing operation, if the above-mentioned writing operation is also performed in the magnetic recording head device 4 located behind the magnetic erasing head device 5, the image displayed on the magnetophoretic display board 3 will be erased. At the same time, a new image display can be created on the magnetophoretic display panel 3.

Here, we will discuss an example in which the magnetic recording head device 4 is located rearward from the magnetic erasing head device 5.
This will be explained using figures. A, b, and c are examples of the above-mentioned line method; a is a front view, b is a top view, and c is a side view. Further, d, e, and f are examples of the above-mentioned serial system, where d is a front view, e is a top view, and f is a side view.

In each figure of FIG. 12, a magnetic recording head device 4 is located on the front side of the magnetophoretic display panel 3, and a magnetic erasing head 5 is located on the back side. The positional relationship between the magnetic recording head 4 and the magnetic erasing head 5 is as follows.
A magnetic erasing head 5 is provided at a position preceding the magnetic recording head 4 by a length a in the recording direction. When writing, the first written image is first erased by the magnetic erasing head, and then the image information is recorded by the magnetic recording head 4, which are successively performed.

Next, an example of executing the erase operation in the serial method shown in FIG. 6b will be described with reference to FIG.

Now, by moving the magnetic erasing head device 5 from the position shown in FIG. 7a to the position shown in FIG.
The result is as shown in Figure b.

Similarly, an example of execution of the rewriting operation will be shown using FIG.

In the carriage 21, the magnetic erasing head device 5 and the magnetic erasing head device 5 are arranged in advance in the moving direction.
The characters "CDE" that were displayed are erased by the magnetic erasing head device 5 by activating both of the magnetic recording head devices 4 at the rear and moving the device from the position shown in FIG. 8a to the position shown in FIG. At the same time, a rewriting character "XYZ" is written by the magnetic recording head device 4 as shown in FIG. 8b.

Such partial rewriting is effective not only for correcting display input errors but also for information that changes over time (for example, stock price display, transportation departure and arrival information, etc.).

The document reading device 7 has the same structure as an optical reading device conventionally used in facsimile machines, and its outline is shown in FIG. 9. 22 is a light source for irradiating light energy onto the original 23; 24 is a mirror for deflecting the light reflected from the original; 25 is a photoelectric conversion element 26 (hereinafter referred to as CCD) that converts the deflected light.
This lens is used to focus light on the object. Further, there are two types of document scanning methods: a fixed document type and a document conveyance type, but the present apparatus is not limited to either one.

The recording device 8 also has a configuration similar to that of a line thermal printer using thermal paper conventionally used in facsimile machines, and its outline is shown in FIG. 27 is a platen roller, 29 is thermal paper, 3
0 is a conveyance roller. Reference numeral 28 denotes a thermal head for thermally recording on the thermal paper 29 according to image data read by the document reading device 7 or the board recording device 6.

Note that, as a matter of course, the recording device is not limited to a thermal printer.

Next, an example of use of the image display device of the present invention will be described.

The flow of the meeting is to distribute materials prepared in advance by the organizer, explain the materials, confirm the progress of the deliberations, and record the results of the deliberations.

This is performed by the document reading device 7 and the recording device 8. That is, the document reading device 7 reads the material prepared in advance, and the document is printed out by the recording device 8. By distributing this, there is no need to prepare copies in advance, and it is possible to accommodate an increase in the number of attendees.

This is performed by the original reading device 7, the magnetophoretic display panel 3, the magnetic erasing head device 5, and the magnetic recording head device 4. First, a document prepared in advance is read by the document reading device 7, and the image of the read document is displayed (written) on the magnetophoretic display board 3 by the magnetic recording head device 4.
let When a document is displayed on the magnetophoretic display board 3, additions to the contents displayed on the magnetophoretic display board 3 are made by hand using a felt pen or the like, like a general white board. Additional notes can be emphasized using the multi-colored felt pens, and can be classified by color, allowing for easy-to-understand explanations and presentations on the magnetophoretic display board 3.

This is similar to what is called a conventional electronic blackboard, and is performed by a board reading device 6 and a recording device 8.
, and print it out using the recording device 8.

The above series of steps will be briefly explained using FIG. 11.

Reference character a shows a manuscript, which is first read by the manuscript reading device 7 and displayed on the board 1 of the present invention. The displayed manuscript is in a state where only the items are written, but no schedule is written, as shown in b. Here, the schedule discussed during the meeting's deliberations is handwritten on board 1 with a felt-tip pen. The handwritten state is c. If the image information c is read by the board reading device 6 and printed out by the recording device 8, a copy with the schedule added as shown in d can be obtained.

On the other hand, in the erasing and rewriting operations described above, the magnetic erasing head device 5 and the magnetic recording head device 4 are selectively driven. It will be done.

Furthermore, if you use a text creation device (hereinafter referred to as a word processor) that has become very popular in recent years, documents created with the word processor can be displayed on the magnetophoretic display board 3, making it easy to edit the documents. It is also possible to do so. Conversely, if the original read by the original reading device 7 and the image read by the board reading device 6 are managed by the word processor, it becomes possible to save them to a magnetic medium (for example, a floppy disk).

<Effects of the Invention> With the image display device of the present invention, image information written on paper can be displayed on the board, and image information displayed on the board can be printed out on paper. It has the functions of an electronic blackboard and an OHP, and can distribute materials, display materials, enter necessary information, post notices, record deliberation results, etc. using only this image display device.
Very convenient.

In addition, since the image erasing means scans the image display means before the image recording means, new image information can be displayed immediately after erasing the image information, so rewriting the image information is quick and easy. can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of one embodiment of the image display device of the present invention, FIG. 2 is a diagram showing one embodiment of the magnetophoretic display plate of the same device, and FIG. 3 is a diagram showing the magnetic recording head of the same device. FIG. 4 is a diagram showing the arrangement of the electromagnet group of the magnetic recording head of the same device, and FIG.
The figure shows the configuration of the board surface reading device of the same device.
The figure shows the configuration of the carriage of the same device, FIG. 7 shows an example of executing an erase operation in the same device, FIG. 8 shows an example of executing a rewriting operation in the same device, and FIG. 9 shows an example of executing an erase operation in the same device. A diagram showing the configuration of an example of a document reading device,
FIG. 10 is a diagram showing the configuration of an example of the recording device of the same device, FIG. 11 is a diagram showing an example of the use of the same device,
FIG. 2 is a diagram illustrating in detail the positional relationship between the magnetic recording head and the magnetic erasing head. DESCRIPTION OF SYMBOLS 1... Board, 3... Magnetophoretic display board, 4... Magnetic recording head device, 5... Magnetic erasing head device, 6... Board surface reading device, 7... Original reading device, 8... Recording device,
9...control device, 10...operation device.

Claims (1)

[Scope of Claims] 1. A handwritten and erasable display means that contains a plastic fluid in which magnetic particles are dispersed and that displays image information by applying a magnetic field and displaying information using magnetic force; recording means for recording the image information by causing magnetic particles of the display means to migrate toward the display surface of the display means using magnetic force; and a recording means provided at a position preceding the recording means with respect to the image recording direction; Erasing means for erasing at least a part of the image information by causing magnetic particles of the display means to migrate to the back side of the display surface of the display means using magnetic force; and the erasing means erases the display means before the recording means. An image display device characterized by scanning.