JP2999856B2 - Electronic blackboard erasing method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for erasing an electronic blackboard used in a conference room or the like.

[0002]

2. Description of the Related Art A general electronic blackboard reads a character, a figure, and the like written on a movable writing medium by a reading unit such as an image sensor and prints out the read character, a figure, and the like by a printer or the like. ing.

[0003] However, when erasing characters, figures, and the like written on a writing medium, the user manually wipes and erases it using a blackboard eraser made of felt, sponge, or the like. When repeating writing and erasing to
It was a heavy burden on the user.

[0004] As a conventional electronic blackboard that solves such a problem, there is, for example, an "electronic blackboard device with an image erasing mechanism" disclosed in Japanese Patent Application Laid-Open No. 61-9071. This means that the support tool is rotated by the support tool drive source to cause the erasing component to contact the writing medium, the writing medium is caused to run by the rotation of the roller, and the erasing component is rotated or reciprocated by its movable means. By doing so, characters and figures drawn on the writing medium are automatically wiped and erased with the wiping material.

[0005] Further, there is an "electronic blackboard" disclosed in Japanese Patent Application Laid-Open No. 61-189063. This is because the writing medium is run by the rotation of the roller driven by the driving unit, and the erasing machine in which the felt or the like containing water or solvent contacts the writing medium slides on the writing medium to contact the writing medium. This automatically wipes and erases drawn characters and figures.

[0006]

However, in the above-described conventional electronic blackboard, it is not always possible to completely erase an image such as a character or a figure written on a writing medium by one erasing operation. The user has to visually check the erasure state of the writing medium after the execution of the erasure, and if there is any erasure, there is a problem that the erasure must be performed again.

[0007]

According to the present invention, a writable and erasable writing medium is moved and an erasing member is brought into contact with the writing medium to wipe a written image written on the writing medium. Erasing, reading the residual image of the writing medium after erasing, and slidingly moving the writing medium while keeping the erasing member in contact with the writing medium until the residual image of the writing medium disappears, Complete erase control of handwritten images.

According to the second aspect of the present invention, a writable and erasable writing medium is provided, a medium drive unit for moving the writing medium is provided, and an erasing member for wiping and erasing a written image written on the writing medium is provided. An erasing member driving unit for bringing the erasing member into and out of contact with the writing medium; and a reading unit for reading a residual image of the writing medium after erasing, and erasing when there is no remaining image read by the reading unit. An erase control unit for generating a stop signal is provided.

According to the third aspect of the present invention, a writable and erasable writing medium is provided, a medium driving unit for moving the writing medium is provided, and an erasing member for wiping and erasing a written image on the writing medium is provided. An erasing member drive unit for bringing the erasing member into and out of contact with the writing medium; an image sensor for reading a residual image of the writing medium after erasing; and storing residual image information obtained by the image sensor. A frame memory is provided, and an erasure control unit for generating an erasure stop signal when residual image information in the frame memory is exhausted is provided.

[0010]

In the present invention, when erasing a written image written on a writing medium, the erasing member is brought into contact with the writing medium and the writing medium is wiped and erased by slidingly moving the writing medium. The residual image on the writing medium after the erasing was read, and the writing medium was slid and moved while the erasing member was kept in contact with the writing medium until the residual image on the writing medium disappeared. At times, an erase stop signal is generated to stop the erase operation,
With one erasing operation, the written image on the writing medium can be completely erased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. First, an outline of a mechanical configuration of the present embodiment will be described with reference to FIGS. A large endless writing medium 3 is wound around parallel rollers 1 and 2 which are separated from each other left and right. The writing medium 3 is capable of writing an image with a writing instrument using an aqueous ink, for example, an aqueous felt pen or the like, and is capable of wiping and erasing the written image with a felt, a sponge, or the like. .

A reading unit 4 is provided on the back of the writing medium 3.
Are arranged. The reading unit 4 irradiates the light of the light source 5 to the writing medium 3, reduces the optical path of the reading via the mirror 6 and the lens 7 via the mirror 6 and the lens 7, and forms an image on the CCD 8 as an image sensor. It has a function of reading a written image written on the writing medium 3.

An erasing member 9 is disposed near the left side surface of the roller 1. The erasing member 9 is formed of felt, sponge, or the like, and has a curved surface facing the left side surface of the roller 1 and along the outer peripheral surface of the roller 1,
The writing medium 3 has a length equal to the vertical width of the writing medium 3.

Next, an outline of the electrical configuration of the present embodiment is shown in FIG.
It will be described based on. The electrical configuration of the apparatus is roughly divided into an erasing control unit 10, an operation unit 11, a reading system 12 including the CCD 8 of the reading unit 4, a writing system 13, and a driving system 14.

The erasure control unit 10 includes a CPU 15 and an RA
It is formed by connecting M16 and ROM 17 on a bus line.

The operation section 11 is for inputting instructions such as a print output operation and an erase operation of a handwritten image written on the writing medium 3. The operation unit 11 is provided with the CPU 1
5 is connected.

The reading system 12 includes a timing generator 18 at an input stage connected to the CPU 15 and a C generator connected to an output side of the timing generator 18.
It comprises a CD 8 and a frame memory 21 connected to the output side of the CCD via an amplifier 19 and an A / D converter 20. The frame memory 21 is connected to the CPU 15.

The writing system 13 includes the frame memory 1
2 and a printer control unit 22 connected to the CPU 15
And the printer 23 connected to the printer control unit 22
And it is.

The drive system 14 includes a light source lighting device 24 connected to the light source 5 and a motor drive unit 2 as a medium drive unit connected to a motor 25 connected to the roller 1.
6 and an erasing member driving unit 27 connected to the erasing member 9
And more. The light source lighting device 24, the motor drive unit 26, and the erasing member drive unit 27 are each connected to the CPU 15. However, the motor 25 can be rotated forward and backward by the motor drive unit 26.

In such a configuration, the erasing member 9 is
At the time of writing, displaying, and printing out an image on the writing medium 3, it is separated from the writing medium 3 and stands by. Then, when the user instructs a print output by the operation unit 11 after writing an image such as a character or a graphic on the writing medium 3, the CPU 15 receiving the instruction instructs a motor drive unit 26, and the motor drive unit 26 By rotating the motor 25 in the forward direction, the roller 1 is rotated, and the writing medium 3 is moved in the arrow direction A in FIG. 3 by this rotation. With this movement, a handwritten image written on the writing medium 3 passing through the reading position C is read by the CCD 8.
Are read and converted photoelectrically into an electric signal to obtain a handwritten image signal. However, in this case, the CPU 15 instructs the light source lighting device 24, and the light source 5
Is turned on, and at the same time, the timing generator 18 is controlled so that the writing image of the writing medium 3 is read by the CCD 8 at the output timing of the timing generator 18. Next, the handwritten image signal obtained by the CCD 8 is amplified by the amplifier 19, and the A / D converter 2
After being converted into digital image data at 0, image data for one page of the handwritten image written on the writing medium 3 is sequentially stored in the frame memory 21. Further, the image data of one page of the writing medium 3 stored in the frame memory 21 is printed out by controlling the printer 23 by the printer control unit 22 which receives the instruction of the CPU 15.

On the other hand, when erasing a handwritten image written on the writing medium 3, the user gives an instruction for erasure using the operation unit 11. The CPU 15 of the erasure control unit 10 receiving this instruction
Command the erasing member driving unit 27 to cause the erasing member 9 to contact the writing medium 3 by a solenoid (not shown) of the erasing member driving unit 27, a motor (not shown), or the like. At the same time, CPU
15 instructs the motor driving unit 26 to
Causes the motor 25 to rotate forward. The roller 1 is rotated by the forward rotation of the motor 25, and the roller 1 is further rotated.
The writing medium 3 is slid in the arrow direction A while the writing medium 3 is kept in contact with the erasing member 9 by the rotation of, so that the writing image on the writing medium 3 is deleted. Thereafter, after passing through the erasing member 9 and passing through the reading position C, the CPU 15 instructs the light source lighting device 24, and the light source 5
Is turned on, and at the same time, the timing generator 18 is controlled to cause the CCD 8 to read the residual image on the writing medium 3 after the erasure by the output timing of the timing generator 18. As a result, a residual image signal photoelectrically converted into an electric signal is obtained. This residual image signal is amplified by an amplifier 19, converted into digital image data by an A / D converter 20, and then sequentially stored in a frame memory 2
1 is stored. Since the image data in the frame memory 21 can be accessed by the CPU 15, the CPU 15 checks the image data after erasure to determine whether or not the erasure has been completed. If black data exists after passing through the erasing member 9, the CPU 15 instructs the motor driving unit 26 to rotate the motor 25 in the reverse direction, rotate the roller 1 by this rotation, and further erase by this rotation. The writing medium 3 is slid and moved in the arrow direction B opposite to the arrow direction A in FIG. 3 until the writing medium 3 passes through the erasing member 9 while keeping the writing medium 3 in contact with the member 9, and the motor 25 is rotated forward again. The writing medium is rotated in the direction of arrow A via the roller 1 by the
Read by number 8. The residual image signal obtained by the CCD 8 is stored as image data in the frame memory 21 via the amplifier 19 and the A / D converter 20.
Then, the CPU 15 again checks the presence of black data in the frame memory 21. The erasing control unit 10 controls the above-described erasing operation to be repeatedly executed until black data no longer exists by this check. And
When the CPU 15 of the erase control unit 10 checks that the black data is no longer present, the erase control unit 10 generates an erase stop signal, and the CPU 15 sends the erase stop signal to the motor drive unit 26 and the erase member drive unit 27. After the writing medium 3 is moved to a predetermined position by the motor drive unit 26 via the motor 25 and the roller 1, the writing medium 3 is stopped, and the erasing member 9 is separated from the writing medium 3.

As described above, the residual image remaining on the writing medium 3 after erasure is read by the CCD 8, and if there is any residual image, the erasing operation is performed by the erasing control unit 10 until the residual image is completely erased. By controlling the repetition, the written image on the writing medium 3 can be completely erased by a single erasing operation.

In this embodiment, the endless writing medium 3 is used.
Has been described, but the rewind-type writing medium 3
Can be implemented similarly. Further, although a reduction optical system is used as the reading system 12, the same can be implemented by using an equal-magnification optical system.

[0024]

According to the present invention, a writable and erasable writing medium is provided, and a medium drive unit for moving the writing medium is provided.
An erasing member for wiping and erasing a written image written on the writing medium is provided, and an erasing member driving unit for bringing the erasing member into and out of contact with the writing medium is provided, and reading for reading a residual image of the writing medium after erasing. And an erasing control unit that generates an erasure stop signal when there is no residual image read by the reading unit. Therefore, when erasing a written image written on a writing medium, the erasing member is applied to the writing medium. The writing image on the writing medium is wiped and erased by sliding the writing medium, the residual image on the writing medium after the erasing is read, and the erasing member is brought into contact with the writing medium until the residual image on the writing medium disappears. The erase operation is performed by sliding the writing medium while erasing it, and the erase operation is stopped by generating an erase stop signal when the residual image on the writing medium is exhausted. It has the advantage of being able to completely erase the written image of the writing medium Te.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a partial perspective view schematically showing a mechanical configuration of the electronic blackboard.

FIG. 3 is a plan view of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 writing medium 4 reading unit 8 image sensor 9 erasing member 10 erasing control unit 21 frame memory 26 medium driving unit 27 erasing member driving unit

Claims (3)

(57) [Claims] 1. A writable and erasable writing medium is moved and an erasing member is brought into contact with the writing medium to wipe and erase a written image written on the writing medium, and a residual image of the writing medium after erasing. Read, and the writing image on the writing medium is completely erased by sliding the writing medium while keeping the erasing member in contact with the writing medium until there is no residual image on the writing medium. A method for erasing an electronic blackboard, comprising: 2. A writable and erasable writing medium is provided, a medium drive unit for moving the writing medium is provided, and an erasing member for wiping and erasing a written image written on the writing medium is provided. An erasing member drive unit for contacting and separating from the writing medium is provided, a reading unit for reading a residual image of the writing medium after erasing is provided, and an erasing stop signal is generated when the residual image read by the reading unit disappears. An electronic blackboard erasing device comprising a control unit. 3. A writable and erasable writing medium is provided, a medium drive unit for moving the writing medium is provided, and an erasing member for wiping and erasing a written image written on the writing medium is provided. An erasing member driving unit that contacts and separates from the writing medium is provided, an image sensor that reads a residual image of the writing medium after erasing is provided, and a frame memory that stores residual image information obtained by the image sensor is provided. An erasing device for an electronic blackboard, comprising an erasing control unit for generating an erasing stop signal when residual image information in a frame memory is exhausted.