JP2579918B2 - Electronic blackboard - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic blackboard, and more particularly, to an electronic blackboard capable of reading image information written on a manuscript and directly writing it on a writing medium.

(Prior Art) Recently, there has been developed an electronic blackboard capable of copying, on a recording sheet, writing information written on a board having a large screen (hereinafter referred to as a writing medium) with a felt pen or the like. This can be used, for example, in a conference or the like to copy and distribute the required number of pieces of document information on a writing medium as needed during the proceedings, thereby eliminating the need for copying and the like and improving the efficiency of the conference. be able to.

(Problems to be Solved by the Invention) However, in such a conventional electronic blackboard, only the document information written on the writing medium is copied onto the recording paper. Therefore, manuscripts created in advance,
In order to display document information copied on a document or recording paper on an electronic blackboard, they must be copied onto a writing medium. As a result, there has been a problem that unnecessary time and labor are wasted and the proceedings of the proceedings are deteriorated, and it is difficult to improve the efficiency of the meeting.

(Objects of the Invention) Accordingly, the present invention provides a method of fixing a manuscript on a writing medium of an electronic blackboard, reading the image information written on the manuscript at a high resolution, and making it possible to limit the writing information on the writing medium. It is an object of the present invention to automate writing of document information on a medium, improve convenience and usability of an electronic blackboard, and improve efficiency of a meeting.

(Constitution of the Invention) In order to achieve the above object, the present invention provides a writing medium having a fixing member for fixing an original and writing information on the writing with a writing instrument, and writing information on the writing or the writing medium of the original. Image reading means for reading document information and outputting an image signal; image signal converting means for sampling the image signal from the image reading means at a predetermined frequency; and storing the image signal sampled by the image signal converting means. Image storage means for reading document information from an original;
Operating means for selectively instructing a mode and a second mode for reading image information written on a writing medium, and control for setting a sampling frequency by the image signal converting means based on the mode instructed by the operating means Means for setting the sampling frequency to a high frequency when the first mode is specified, and setting the sampling frequency to a low frequency when the second mode is specified. Things.

Hereinafter, a specific description will be given based on examples of the present invention.
1 to 3 are views showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an electronic blackboard, and a main body 1a of the electronic blackboard 1 includes a display screen 2, an operation unit 3, and a paper discharge port 4. The display screen 2 is a plate frame opened to a predetermined size, and a writing medium 5 is provided in the frame. The writing medium 5 is, for example, a white plastic sheet, and writing information can be arbitrarily written and erased on a display surface thereof with a writing instrument such as a felt pen. A transparent sheet (fixing member) 6 is provided at a predetermined position of the writing medium 5, and the transparent sheet 6 fixes the original 7 on the writing medium 5. The operation unit 3 includes a page display unit 11 and a page feed key 1 as shown in FIG.
2, a copy number display section 13, a copy number setting key 14, a clear key 15, a copy key 16, and a print key 17 are provided. The page display section 11 is, for example, an LED (Light Emitting Diode).
ode) is used and displays the currently used screen page. The page feed key 12 conveys the writing medium 5 and can select an arbitrary screen page. Copy number display
Reference numeral 13 uses an LED similarly to the page display section 11, and displays the number of copies to be made in accordance with the operation of the copy number setting key. The clear key 15 is a key for arbitrarily interrupting the operation of each unit such as reading and recording of the document information written on the writing medium 5 or printing of the document information on the writing medium 5 even when the respective units are in operation. . Copy key 16 is written medium 5
The print key 17 is a key for instructing a start of reading and recording of the above image information. A print key 17 is a key for issuing a start command for reading written image information of a document described later and writing it on the writing medium 5. That is, each key outputs a command signal corresponding to the operation to the control means 21 shown in FIG. The control means 21 receives a command signal from the operation unit 3
Each part of the electronic whiteboard 1 described in detail below is integrally controlled. In FIG. 3, a signal line for outputting a control signal from the control means 21 to each unit is omitted.

On the other hand, the holding members 22a and 22b hold the writing medium 5 in a wound state, and the writing medium 5 has a plurality of screens wound on the holding members 22a and 22b (that is, the display screen 2). ).

The main shafts of the motors 23a and 23b are fixed to the shaft cores of the holding members 22a and 22b, and a drive signal Ps from the motor driving unit 24 is input to the motors 23a and 23b. A control signal from the control unit 21 is input to the motor driving unit 24, and the motor 23a,
23b is controlled based on an operation command from the operation unit 3. That is, the motors 23a and 23b rotate in synchronization with each other according to the drive signal Ps from the motor drive unit 24, and the holding members 22a and 22b
Is transported (sub-scan or forward feed) at a predetermined speed. Here, the sub-scanning is performed when reading the image information on the writing medium 5 and when scanning the original 7 fixed on the writing medium 5.
Is different for reading. That is, the sub-scanning (the sub-scanning amount) is appropriately set according to the resolution of the reading unit described later. The holding members 22a and 22b and the motor 2
3a, 23b and the motor drive unit 24 constitute a transport unit 25 as a whole.

The image reading means 26 uses, for example, a line image sensor, and is disposed close to the left side of the writing medium 5 in FIG. Such a line image sensor has a plurality of light receiving elements arranged at a predetermined density (for example, 4 dots / mm), and has a light source and an imaging element (not shown). The image information written on the writing medium is read based on the information. That is, when the read signal is input from the control unit 21, the image reading unit 26 irradiates the light from the light source onto the writing medium 5 and performs the main scanning at a predetermined timing to perform the image information on the writing medium 5. The data is read for each line, photoelectrically converted, and output to the amplifier 27 as an image signal (video signal). The amplifying unit 27 converts the image signal from the image reading unit 26 into, for example, 1
The signal is amplified for each line and output to the A / D converter 28. A / D converter
The sampler 28 samples the image signal from the amplifying unit 27 with a clock of a predetermined frequency, converts it into a digital signal (also called an image signal in this case), and outputs it to the recording unit 29. As the recording means 29, an electrostatic recording method, a thermal recording method, a liquid crystal electrophotographic recording method, or the like is used.For example, in the case of the thermal recording method, a thermal head based on an image signal from the A / D converter 28 is used. The heating elements of the
(In this case, thermosensitive recording paper) is conveyed every time one line is printed, and the document information written on the writing medium 5 is reproduced on the recording paper 30 and output as a copy image. The recording means 29 is provided with an image memory, and can store an image signal for one screen and copy it to a plurality of recording papers 30. The recording paper 30 on which the copy image is formed is discharged to the outside from the paper discharge port 4 (see FIG. 1).

On the other hand, in contact with the image reading means 26, the reading means 26
The document reading means 31 is provided on the same line as the document, and the document reading means 31 is disposed at substantially the same position as the transparent sheet on the writing medium 5. For the original reading means 31, for example, a line image sensor having a light receiving element of 8 dots / mm is used.
Is converted into a read image signal at a high resolution and output to an image memory 34 via an amplifier 32 and an A / D converter 33. The document reading means 31, the amplification section 32, the A / D conversion section 33
Has the same functions as those of the above-described image reading means 26, amplifying section 27, and A / D converting section 28, and a description thereof will be omitted. Image memory 34
For example, a RAM (Random Access Memory) is used. An image signal digitally processed by the A / D converter 33 is taken in line by line, and an image signal for one screen of the image 7 is stored. Output to the writing means 35 according to the signal. The writing unit 35 uses, for example, an ink-jet head, and is disposed close to the right side of the writing medium 5 in the drawing and is arranged in the width direction of the writing medium 5. The inkjet head has a plurality of nozzles (not shown) formed at a predetermined density (for example, 4 dots / mm).
An image is formed on the writing medium 5 by selectively ejecting ink (for example, black ink) stored therein based on the image signal from 1 for each line.

 Next, the operation will be described.

Here, the electronic blackboard 1 of the present invention has a function of recording the image information written on the writing medium 5 on the recording paper 30 and a function of writing the image information read from the manuscript 7 on the writing medium 5. The operation will be described sequentially next.

(I) Recording of image information written on the writing medium 5.

First, when recording on the recording paper 30, the necessary number of copies is set by operating the copy number setting key 14 of the operation unit 3.
Next, when the copy key 16 is pressed, a control signal is outputted from the control means 21 to each section. At this time, first, the light source provided on the image reading means 26 is turned on, and the light from the light source is irradiated over the width direction of the writing medium 5, and the main scanning is performed from a predetermined position of the writing medium 5 by the line image sensor. Then, the document information for one line is read. When the document information for one line is read, the motors 23a and 23b are driven based on the drive signal Ps from the motor drive unit 24,
The writing medium 5 is sub-scanned to the next line position. Here, the sub-scanning of the writing medium 5 is performed at a resolution of 4 dots of the image reading means 26.
/ mm (0.25mm). Therefore,
The writing medium 5 is transported in synchronization with the reading timing of each line by the image reading means 26, and the image information for one screen displayed on the display unit 2 is read and output as an image signal. The image signal output from the image reading means 26 is
And output to the recording means 29 via the A / D converter 28.
The recording means 29 selectively heats a heating element based on the image signal, for example, in the case of a thermal recording method,
The printing for the lines is performed, and the recording paper 30 is sub-scanned at a predetermined timing. Therefore, the same document information as that written on the writing medium 5 is reproduced on the recording paper 30.

(II) Writing on the writing medium 5.

First, the original 7 is placed on the transparent sheet 6 provided on the writing medium 5.
Is fixed, and when the print key 17 is pressed, a control signal is output from the control means 21 to each section. At this time, the original reading means 31
The light source provided in the light source is turned on, a predetermined portion of the writing medium 5 is illuminated, the main scanning is performed from a predetermined position of the transparent sheet 6 by the line image sensor, and the original 7 is read line by line. The writing medium 5 is sub-scanned to the next line position. Accordingly, the original 7 is also sub-scanned at the same time, the entire surface of the original 7 is read, converted into an image signal, and stored in the image memory 34 via the amplifier 32 and the A / D converter 33. It should be noted that the sub-scanning at the time of reading the document differs from the case of reading the image information on the writing medium 5 and the resolution of the document reading means 31 is different.
It is performed in an amount (0.125 mm) corresponding to 8 dots / mm. Image memory
When the image signal of the entire surface of the document 7 is stored in the storage 34, the writing medium 5 is rewound to a predetermined position (the top of the screen page). When the position of the writing medium 5 is determined, the image signal stored in the image memory 34 is output to the writing means 35. Based on the image signal, the writing means 35 selectively emits black ink from each nozzle, for example, line by line, and performs writing. Therefore, the same document information as the document 7 is enlarged at a ratio corresponding to the display screen 2 and reproduced on the writing medium.

As described above, the image information written on the writing medium 5 is not only copied and recorded by the same means as in the past, but also the original 7
Can be read and reproduced on the writing medium 5. Therefore, unnecessary time and labor such as copying or rewriting the original 7 on the writing medium 5 can be omitted, and the efficiency of the conference can be further improved. Further, since the document information of the document 7 fixed at a predetermined position on the writing medium 5 can be read at a high resolution, it is not necessary to specially provide a device (scanner device or the like) only for reading the document 7. Accordingly, there is an excellent effect that an electronic blackboard capable of directly reproducing the picture information of the original 7 on the writing medium 5 can be provided at low cost. In this embodiment, the writing of the document information of the manuscript 7 has been described on the writing medium 5, but it goes without saying that the writing information can be written by hand as in the prior art.

FIG. 4 is a diagram showing an embodiment directly corresponding to the claims of the present invention. The same components as those in the embodiments in FIGS. The configuration and operation of the device will be described.

In FIG. 4, reference numeral 41 denotes an electronic blackboard. The electronic blackboard 41 includes an image reading means 42, an amplifier 43, an A / D converter 44, and an image memory 4.
5. A switching unit 46 is provided.

As the image reading means 42, a line image sensor is used. In this line image sensor, low density portions (for example, 4 dots / mm) 42a and 42b and high density portions (for example, 8 dots / mm) 42c of the light receiving element are the same. It is appropriately arranged on the line.
That is, the high density portion 42c of the light receiving element functions as a document reading unit, and converts the document 7 fixed to the writing medium 5 into a read image signal at a high resolution similarly to the document reading unit 31 of the first embodiment. .

The amplifying unit 43 amplifies the image signal from the image reading unit 42 for each line, for example, and outputs it to the A / D conversion unit 44. A / D converter 44
Samples the image signal from the amplifying unit 43 at a predetermined clock frequency, performs digital processing, and outputs it to the image memory 45. Here, the sampling frequency by the A / D conversion unit 44 is divided into two types according to the input from the operation unit 3. That is, when the copy key 16 is pressed, the reading density is 4 dots / m
Sampling is performed at a frequency corresponding to m. Therefore, the 8dot / mm image signal from the high density part 42c is also 4dot
The signal is sampled at / mm and output to the image memory 45 as a 4 dot / mm image signal and stored. On the other hand, when the print key 17 is pressed, sampling is performed at a frequency corresponding to the reading density of 8 dot / mm, and only the image signal read at 8 dot / mm is selectively output to the image memory 45 and stored. You. The switching unit 46 switches the circuit based on the input from the operation unit 3 and outputs the image signal for one screen stored in the image memory 45 to the recording unit 29 or the writing unit 35. That is, when the copy key 16 is pressed, the output of the image memory 45 is connected to the recording means 29, and the document information on the writing medium 5 can be copied on the recording paper 30. On the other hand, when the print key 17 is pressed, the output of the image memory 45 is connected to the writing means 35, and the writing information of the original 7 fixed on the writing medium 5 can be reproduced on the writing medium 5. In this embodiment, the A / D conversion unit 44 is an image signal conversion unit that samples the image signal from the image reading unit 42 at a predetermined frequency, and the image memory 45 is an image signal sampled by the A / D conversion unit 44. The operation unit 3 includes a first mode for reading document information from the original 7 and a second mode for reading document information written on the writing medium 5.
The operation means for selectively instructing the mode and the control means 21 are controlled by the A / D conversion section 44 based on the mode instructed from the operation section 3.
The control unit 21 sets the sampling frequency to a high frequency when the first mode is instructed.
When the second mode is instructed, the sampling frequency is set to a low frequency.

As described above, by appropriately setting the density of the light receiving elements provided in the image reading means 42, the writing information written on the writing medium 5 and the writing information of the original 7 fixed on the writing medium 5 are respectively converted. It can be read at an appropriate density.
In addition, the amplification unit 43, the A / D conversion unit 44, and the image memory 45 are switched to the switching unit 4
6 can be used in common, so that components can be largely omitted.

Therefore, the cost and size of the electronic whiteboard 45 can be reduced. Further, by making the sampling frequency different, it is possible to distinguish the written information of the original 7 from the written information on the writing medium 5 with high accuracy and read the image information with high accuracy. It is possible to prevent the reading accuracy of the original 7 from deteriorating when used together with the above-mentioned document information for reading, and to prevent trouble in reading the document information and the document information on the writing medium.

(Effect) According to the present invention, it is possible to read document information at high resolution from a document fixed on an electronic blackboard and write the document information on a writing medium. As a result, the convenience and availability of the electronic blackboard can be improved, and the efficiency of the conference can be increased. Further, by changing the sampling frequency of the image signal read by the image reading means based on the mode instructed by the operation means, the document information written on the writing medium and the document fixed on the fixing member of the writing medium And the document information can be read at appropriate densities, and image reading means for reading the document information of the document and the document information on the writing medium can be used together. Therefore, the components of the electronic blackboard can be simplified, and the cost and size of the electronic blackboard can be reduced.

In addition, by making the sampling frequency different, it is possible to reliably distinguish the document information on the document from the document information on the writing medium and read the document with high accuracy. To prevent the reading of the document information and the document information on the writing medium from being disturbed.

[Brief description of the drawings]

1 to 3 are diagrams showing a first embodiment of the electronic blackboard of the present invention. FIG. 1 is an overall view of the electronic blackboard, FIG. 2 is a plan view of an operation unit of the electronic blackboard, FIG. FIG. 4 is an overall configuration diagram of the electronic blackboard, and FIG. 4 is an overall configuration diagram showing a second embodiment of the electronic blackboard of the present invention. 1, 41: electronic blackboard, 5: writing medium, 7: manuscript, 25: transport means, 26, 42 ... image reading means, 29 ... recording means, 30 ... recording paper, 31, 42c ... ... original reading means, 35 ... writing means.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-155666 (JP, A) JP-A-62-249552 (JP, A) JP-A-62-198758 (JP, U)

Claims (1)

(57) [Claims] 1. A writing medium having a fixing member for fixing an original and capable of writing writing information with a writing instrument, and an image for reading writing information of the original or writing information written on the writing medium and outputting an image signal. Reading means; image signal converting means for sampling the image signal from the image reading means at a predetermined frequency; image storing means for accumulating the image signal sampled by the image signal converting means; Operating means for selectively instructing a first mode and a second mode for reading image information written on a writing medium; and setting a sampling frequency by the image signal converting means based on the mode instructed by the operating means. Control means for setting the sampling frequency to a high frequency when the first mode is instructed, Electronic blackboard characterized by setting the frequency of sampling in the case of over-de is instructed to a lower frequency.