JPS63242061A - Electronic blackboard with magnified display function - Google Patents

Abstract

PURPOSE:To improve the magnification display speed onto a writing medium face by a recording head by making the ratio of an original read size and a magnified display pattern size equal to the ratio of the picture element density at read and the picture element density at magnified display. CONSTITUTION:A single picture element of a recording head of a magnification recording section corresponds to a read picture element being the 2nd read means. Then the ratio of a read size (c) or (d) of an original to a magnified display pattern size (i) or (j) is made equal to the ratio of a picture element density (e) or (f) at original reading to a picture element density (k) or (l) at magnified display. Thus, when the picture element density of the, e.g., 2nd read element is 8 dots/mm and the magnification display factor onto a written medium face is 4 times, the picture element density by the recording head is 8divided by 4=2 dots/mm, and the dot diameter is selected to be 0.5mm.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an enlargement display function that not only has the function of copying the content written on the blackboard surface, but also has the function of enlarging and displaying hand-held materials on the blackboard surface. This relates to an electronic blackboard with a

[Prior Art] An electronic blackboard that has a function of not only copying the content written on the blackboard surface but also enlarging and displaying hand-held materials on the blackboard surface is disclosed in, for example, Japanese Patent Application Laid-Open No. 60-263557. As already known. If you use such an electronic blackboard, you won't have to take notes because you can copy what is written on the blackboard later.On the other hand, you can enlarge and display the materials you have on the blackboard as appropriate, so you can easily make a meeting. It has the advantage that it is not necessary to prepare an overherad projector or a hanging map in advance, so it can be said that the value of use is very high.

[Problems to be Solved by the Invention] However, in the electronic blackboard disclosed in the above publication, felt-tip pens are placed facing each other on the surface of a movable sheet-like writing medium, and hand-held materials are enlarged and displayed on the surface of the writing medium. If desired, the document or the like is read by a separately provided image reading device, and the image data is sent to the felt-tip pen. Therefore, the felt-tip pen runs on the surface of the writing medium based on the image data, and the enlarged image is transferred onto the surface of the writing medium in a serial plot manner.

According to the electronic blackboard in this bulletin, the ratio between the pixel density read by the image reading device that reads the image on the document surface and the pixel density of the enlarged image transferred in a serial plot manner onto the surface of the writing medium is not necessarily the enlarged display magnification. Because they do not match, 1
Plotting is performed many times for one read pixel data, reducing the speed of enlarged display. Furthermore, apart from the electronic blackboard described in this publication, for example, in a digital copying machine with an enlargement/reduction function, for one reading pixel,
In some copying units, a plurality of pixels are combined, but this often has the disadvantage that the manufacturing cost of the recording head as an enlarged display means becomes too high.

[Object of the Invention] The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and its purpose is to provide a copying function for contents written on the surface of a writing medium, and a function to copy materials written on the surface of the writing medium. To provide an electronic blackboard which not only has a function of enlarging and displaying the image, but also allows the enlarged image to have good image quality and is quickly enlarged and displayed on the surface of a writing medium. Another object of the present invention is to reduce the manufacturing cost of the recording head that serves as the enlarged display means.

[Means for Solving the Problems] To achieve this objective, the electronic blackboard of the present invention includes a writing medium that can be written with a felt-tip pen or the like, and a screen that reads characters, figures, etc. written on the surface of the writing medium. a first reading means; a means for copying the contents read by the first reading means; a second reading means for reading the material to be enlarged; and a means for copying the contents read by the second reading means. means for enlarging display on the surface of the medium, the ratio of the pixel density of the recording head serving as the enlargement display means to the pixel density of the reading element serving as the second reading means is such that the ratio of the pixel density of the recording head serving as the enlarged display means is such that The gist is that it is determined to correspond to the enlargement magnification between the image and the enlarged display image on the surface of the writing medium.

[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 parallel 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-shaped writing medium 6 is disposed between the two rollers. It is stretched. A motor 7 is connected to the sheet driving roller 4 via a belt 8. Note that the writing medium 6 used is one obtained by laminating a Teflon resin film on a polyester sheet substrate, or by coating a thin layer of chemical-resistant resin. On the other hand, a first reading element 10 is provided in the middle of the rear part of the chassis frame 1, and when an image of characters, figures, etc. written on the writing medium 6 is irradiated with a fluorescent lamp 11, a reflection mirror 12 and is read by the reading element 10 (COD) via the lens 13. and,
The image read by the reading element 10 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 discharged onto a paper tray 16 provided at the bottom of the recording device 15. It is configured to Furthermore, an image scanner 17 that reads images of enlarged materials such as hand-held materials is installed on the chassis frame 1.
When a document is inserted into the insertion slot 18 provided on the lower edge of the
Images such as characters and figures on the surface of the document are read by a COD (not shown), which is a second reading element within the image scanner 17. At the rear lower part of the chassis frame 1, a recording head 17 is disposed facing each other so as to be freely movable in the width direction of the writing medium 6 via a carriage 20. It is configured to be enlarged and recorded on six sides of the writing medium via the recording head 19. The recording head 1
9, a wire dot type print head is used in this embodiment. Note that the original read by the second reading element is discharged onto a vapor tray 21. Further, a cleaner 22 is provided within the chassis frame 1 for erasing an image drawn with ink on the writing medium 6 surface.

FIG. 3 shows the control circuit of this electronic whiteboard, in which a central processing unit (CPU) 41 constitutes a control means;
A gate memory (ROM>42 and a random access memory (RAM>43) are connected to U41.R
The OM 42 stores programs and the like for controlling the overall operation of the electronic blackboard, and the RAM 43 stores a storage order for temporarily storing image information read from the writing medium 6 by the first reading device ``O''. 1t7. etc. are provided.

The CPU 41 includes a first reading device 10, an image scanner 17 serving as a second reading means, and a position detector 44 for detecting the moving position of the writing medium 6 provided in the main body 1.
, and an operation panel 45 provided on the front right side of the main body 1, which has a start button for the recording device 15, a button for specifying the number of copies, etc., is connected via an input interface 46,
Various information and signals are input to the CPU 41 from them.

The CPU 41 also includes a reduction recording device 15 and a recording head 1.
9, cleaner 22, and writing medium moving motor 7 are connected via output interface 47 and drive circuits 48 to 51, and drive and stop signals are output from CPU 41 to them.

According to the present invention, one pixel read by the reading element, which is the second reading means, corresponds to a single pixel of the recording head 19 of the enlarged recording section.

The relationship is shown in Figure 4, and the ratio between the reading size C or d of the original and the enlarged notation screen size 1 or j is the same as the pixel density e or f when reading the original and the pixel density k or 1 when enlarged notation. (♀=4=j−
=1). To do this, use the example JkJ.For example, if the pixel density of the second reading element is 8 dots/mm and the magnification of the enlarged display on the 6 sides of the writing medium is 4 times, the pixel density by the recording head 19 is 8/mm. 4=2 dots/mm and 1. The dot diameter may be 0.5 mm. By configuring each corresponding pixel as a single pixel in this way, there is an advantage that the pixel density of the recording head can be lowered. This solves the problem of poor yield due to pixel density and a large increase in the cost of recording heads.

Note that such a recording head 19 is not limited to the wire dot type recording head mentioned in the above embodiment, but may also be a thermal head, an inkjet head, an electrostatic recording head, or
It can be applied to various recording methods such as a scanning head using a semiconductor radar.

Further, in order to increase the recording speed, a multi-head type in which a plurality of such serial heads are used, or a shuttle type in which one-pin heads are arranged in parallel at equal intervals of 10 to 15 mm may be used.

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

[Effects of the Invention] As explained above, the electronic blackboard according to the present invention not only has 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. Since the ratio of the document reading size and the enlarged notation screen is equal to the ratio of the pixel density at the time of reading and the pixel density at the time of enlarged notation, the speed at which the recording head enlarges and displays the surface of the writing medium is greatly increased. This has the effect of significantly improving the manufacturing cost of the recording head and significantly reducing the cost of the apparatus.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is an external perspective view, FIG. 3 is an electronic control block diagram of this electronic whiteboard, and FIG. 4 is a pixel of the recording head. density and second
FIG. 2 is an explanatory diagram of the relationship between the pixel density and the pixel density of the reading device. 6... Writing medium, 10... First reading device, 15
. . . Reduction recording device, 17 . . . Second reading device, 1
9... Recording head.

Claims (1)

[Scope of Claims] 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 writing medium that can be read by the first reading means. A means for copying content, a second reading means for reading the material to be enlarged, and a means for enlarging and displaying the content read by the second reading means on the surface of the writing medium, The ratio of the pixel density of the recording head which is the enlarged display means and the pixel density of the reading element which is the second reading means is
An electronic blackboard with a magnification display function, characterized in that the magnification is determined to correspond to the magnification ratio between the image on the document surface to be magnified and the magnified display image on the writing medium surface.