JPH053945B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electronic blackboard device that is capable of reducing and recording an image written on a writing medium functioning as a blackboard on a recording medium and outputting the reduced image. .

[Conventional technology]

A conventional electronic whiteboard device of this type is disclosed in, for example, Japanese Patent Laid-Open No. 59-212070.

This electronic blackboard device is a milky-white sheet called a whiteboard on which images such as letters and figures can be written with a writing instrument such as a felt-tip pen, and the written images can be easily erased with a cloth or the like. a reading unit having a photoelectric conversion means for optically reading an image written on the writing medium while moving on the surface of the writing medium and converting it into an electrical signal; and electricity from the photoelectric conversion means. It is equipped with a memory section for storing the signal as image information, and a recording means for recording on a recording medium of a predetermined size, such as A4 size paper, based on the image information read from the memory section, The medium can be used as a blackboard, and images written on the writing medium can be copied and recorded as many times as necessary on the spot.

Incidentally, the recording medium may be formed in advance to a size equivalent to multiple screens and wound around two shafts so that the screen can be advanced by feeding it out from one shaft and winding it up on the other shaft. Alternatively, it can be formed into an endless shape and wound around a plurality of shafts, and can be moved by rotation of the shafts to advance the screen.

Further, as a recording means, a thermal printer using a thermal head, a printer using an electrophotographic method, or the like is used.

[Problem that the invention seeks to solve]

However, with the above-mentioned conventional devices, it is not possible to enlarge and reproduce the image recorded on the recording medium by the recording means or the image recorded on other small media on the writing medium, and also it is not possible to make additions or corrections to the image. There was a problem in that it was not possible to obtain a recorded image again.

As a method to deal with this problem, since the writing medium has the size of multiple screens, the image written on one screen of the writing medium is not erased, but the image is saved by changing the screen. One possible method is to write the next image using another screen, and if necessary, return the screen to make additions and corrections to the previous image, but due to limitations such as the size of the device, Since the length of a writing medium can only be about five screens long at most, there is a natural limit to the number of images that can be saved.

The present invention has been made to solve these problems, and it is possible to enlarge and reproduce images recorded in a reduced size on a recording medium or images recorded on other small media on a writing medium in an electronic blackboard device. It is an object of the present invention to realize an electronic whiteboard device that can read and reduce and record these images after making additions and corrections to the images.

[Means for solving problems]

To achieve this objective, the present invention provides a writing medium on which an image can be written and erased, and a writing medium arranged to move along the surface of the writing medium.
a reading unit comprising a light source for illuminating the writing medium and a reading means for optically reading an image on the writing medium and converting it into an electrical signal; An electronic whiteboard device comprising a recording means for recording a reduced image on the recording medium, an optical projection system for enlarging and projecting the image recorded on the recording medium onto the writing medium is disposed on the surface side of the writing medium, The reading unit is provided with an opening for projecting an image from an optical projection system onto the reading position on the writing medium by the reading means when the reading unit is moved, and a switch means for turning ON/OFF electricity to the light source of the reading unit. The reading means reads the projected image and the written image on the writing medium at the same time with the switch means turning off the power to the light source during image reading.

[Effect]

In the present invention having such a configuration, when an image recorded in a reduced size on a recording medium by a recording means or other small-sized medium is to be reproduced on a writing medium, these media are set in an optical projection system and the writing medium is reproduced. It is enlarged and reproduced by projecting it onto the image.

Then, if you want to make additions and corrections to this reproduced projected image and record the image in a reduced size on a recording medium,
After making additions and corrections to the writing medium from the projected image using a writing instrument, etc., turn off the power to the light source using the switch means and move the reading unit along the surface of the writing medium in this state. The image from the optical projection system is projected onto the projection writing medium through the provided opening, and the added and modified image is illuminated by light from the optical projection system.

As a result, the projected image from the optical projection system and the revised image are simultaneously read as a composite image by the reading means of the reading unit, and the read image is reduced and recorded on the recording medium by the recording means.

Therefore, according to this, past recorded images and images on other media can be enlarged and reproduced on the writing medium, and the projected image on the writing medium and the written image can be simultaneously read by the reading means. Because it can be read,
A composite image of the projected image and the written image can be recorded in a reduced size with a simple and inexpensive configuration that does not require complicated control.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the electronic blackboard device according to the present invention, FIG. 2 is a perspective view showing its operation,
FIG. 3 is a plan view showing the internal structure of the reading unit in FIG. 1.

In the figure, 1 is a milky-white sheet-like writing medium that functions as the blackboard mentioned above, and here it is shown as a fixed size for one screen, but it is not shown as a size for multiple screens. It can be wound around two shafts so that it can be fed out from one shaft and simultaneously wound on the other shaft to feed the screen, or it can be formed into an endless shape and wound around multiple rollers.
It may be configured such that the screen can be advanced by rotating this roller.

Guide rails 2 and 3 are arranged in parallel above and below the writing medium 1, and both upper and lower ends of the reading unit 4 are slidably attached to the guide rails 2 and 3.

As shown in FIG. 3, this reading unit 4 includes a case 6 whose surface facing the writing medium 1 is open and a slit 5 as a vertically elongated opening provided on the opposite surface, and a case 6 disposed inside the case 6. light source 7,
It is composed of a rod lens array 8 and a photoelectric conversion element array 9 as an image reading means, and is configured to reciprocate in the directions of arrows A and B by a driving means including a motor (not shown). .

Here, as the light source 7, a long straight line in a direction perpendicular to the longitudinal direction of the writing medium 1, such as a fluorescent lamp, is used, and the rod lens array 8 includes a large number of rod lenses in the longitudinal direction of the light source 7. Furthermore, the photoelectric conversion element array 9 is constructed by arranging a large number of photoelectric conversion elements in the longitudinal direction of the light source 7 at a pitch equal to the reading resolution. By illuminating the surface of the writing medium 1 and making the reflected light enter the photoelectric conversion element array 9 through the rod lens array 8, the image on the writing medium 1 is read one line at a time by the photoelectric conversion element array 9. It is converted into an electrical signal.

Reference numeral 10 denotes a recording means, for example, an electrophotographic printer is used, and this recording means 10 is connected to the reading unit 4 via a signal line 11.

The above configuration is the same as the conventional one except that the slit 5 is provided in the case 6 of the reading unit 4.

Reference numerals 12 and 13 are transparent films of A4 size, for example, which are used as recording media for the recording means 10.

14 is an OHP (overhead projector) device used as an optical projection system, and this OHP device 1
4 is a film support stand 1 with a built-in light source (not shown)
5, a reflecting mirror 16 and a lens 17 disposed above the film support 15. In this embodiment, the OHP device 14 is arranged to face the surface of the writing medium 1, and the reading unit 4 The light source 7 is provided with a switch means (not shown) for turning on/off the power supply to the light source 7.

Next, the operation of the above-described configuration will be explained.

First, as shown in FIG. 1, after an image "A", for example, is written on the writing medium 1 with a writing instrument, the reading unit 4 is moved in the direction of arrow A, which is the sub-scanning direction, by a driving means (not shown). At this time,
The light source 7 of the reading unit 4 is energized by a switch means (not shown), so that the light source 7 is automatically turned on upon movement. As the reading unit 4 moves, the surface of the writing medium 1 is sequentially irradiated, and the reflected light enters each photoelectric conversion element of the photoelectric conversion element array 9 via the rod lens array 8. Image "A" is read and converted into an electrical signal.

In other words, the line part of the image "A" has a low reflectance, and the white part of the writing medium 1 has a high reflectance, so the photoelectric conversion element makes the line part of the image "A" black and the rest. The part is converted into an electrical signal as white.

Then, main scanning is performed by sequentially extracting the electrical signals of these photoelectric conversion elements in time series using a switch circuit (not shown), etc., and the extracted electrical signals are transmitted as image information to the recording means via the signal line 11. 10, this recording means 1
At 0, the image "A" is recorded in a reduced size on the transparent film 12 and is ejected.

When the reading unit 4 moves to the right end of the guide rails 2 and 3 and finishes reading, it moves in the direction of arrow B and returns to the left end of the guide rails 2 and 3 and waits, and the light source 7 is automatically turned off. do.

Next, the image "A" written on the writing medium 1
After the image "A" is erased, if the image "A" recorded in a reduced size on the transparent film 12 is to be enlarged and reproduced on the writing medium 1, the transparent film 12 is used as an original sheet and the OHP device 14 is used as shown in FIG. The film is set on the film support stand 15, and the light source built into the support stand 15 is turned on. As a result, the image "A" on the transparent film 12 is projected onto the writing medium 1 by the reflecting mirror 16 and lens 11. In other words, the image "A" on the transparent film 13a is enlarged and reproduced on the writing medium 1.

Here, when adding and correcting this reproduced image "A", images such as "B" and "C" are written on the writing medium 1 with a writing instrument.

Then, when recording the image "ABC" after additions and corrections, the reading unit 4 is moved again in the direction of arrow A to perform a reading operation.

During this reading operation, a switch means (not shown) turns off the power to the light source 7 of the reading unit 4, so that the light source 7 does not light up. However, the surface of writing medium 1 is OHP
Since it receives the projection light of the device 14, the written image "BC" will be illuminated by this projection light.

On the other hand, when the reading unit 4 moves over the writing medium 1, part of the projected light is blocked, but since the case 6 of the reading unit 4 is provided with a slit 5, Projection light enters and illuminates the writing medium 1 as indicated by arrow C shown in FIG. 3, and its reflected light passes through the rod lens array 8 and enters the photoelectric conversion element array 9.

Therefore, by moving the reading unit 4, the image "A" and the image "BC" are simultaneously read by the photoelectric conversion element array 9 and converted into electrical signals.

In other words, the line portion of the image “A” projected by the OHP device 14 has little projection light and is therefore converted into an electrical signal as black, and the portions of the images “B” and “C” that have been added and corrected are bright projected light. However, since the reflectance is low, it is converted into an electric signal as black, and the other part is converted into an electric signal as white, which is the background color of the writing medium 1.

These electric signals are then sent as image information to the recording unit 10 via the signal line 11 in the same manner as described above, so that the recording means 10 records the transparent film 13.
The image “ABC” is recorded in a reduced size and ejected.
In other words, the image projected onto the writing medium 1 by the OHP device 14 and the image written on the writing medium 1 with a writing instrument are simultaneously synthesized, resulting in a reduced record similar to when the writing medium 1 is viewed with the human eye. can be obtained.

Note that reproduction of images recorded on other small media, additions and corrections to the reproduced images, and subsequent recording can also be performed in the same manner.

FIG. 4 is a plan view showing another example of the reading unit 4 used in the present invention, and this reading unit 4 includes a light source 7.
, a half mirror 18 that bends the optical path of the reflected light from the writing medium 1 at right angles, two reflective mirrors 19a and 19b diagonally opposed to each other to reduce the optical path of the light from this half mirror 18, and an image. It is composed of a CCD image sensor 20 as a reading means, and a lens 21 for reducing and projecting the light from the reflecting mirror 19b onto the CCD image sensor 20. In this case, the projected light from the OHP device 14 is As shown in D, the writing medium 1 is irradiated through the half mirror 18.

Even in this case, the image on the writing medium 1, that is, the image projected by the OHP device 14 and the image written with the writing instrument, can be read and converted into electrical signals as in the case of FIG. 3. .

Note that the present invention is not limited to the embodiments described above, and for example, as an optical projection system, the embodiments described above may be used.
In addition to the OHP device 14, it is also possible to use a slide projector, a physical projector, a video projector, etc.

Further, the recording means 10 may be a printer other than an electrophotographic printer as long as it can record images on transparent film or paper, and if a memory for storing image information is added to the recording means 10 etc., multiple sheets of the same hard disk may be used. You can get a copy.

〔Effect of the invention〕

As explained above, in addition to the conventional configuration, the present invention disposes an optical projection system on the surface side of a writing medium, and uses this optical projection system to enlarge and project an image recorded on the recording medium onto the writing medium. As a result, it is possible to enlarge and reproduce past recorded images or images on other media on the writing medium.

In addition to the optical projection system, the reading unit is provided with an opening for projecting an image from the optical projection system onto a reading position on the writing medium by the reading means when the reading unit is moved, and a light source of the reading unit is provided. The structure is equipped with a switch means for turning on/off energization to the light source, and when the light source is energized by the switch means at the time of image reading, the projection image on the writing medium and the written image are simultaneously read by the reading means. Therefore, it is possible to record a composite image of the projected image and the written image in a reduced size with a simple and inexpensive configuration that does not require complicated control.

Further, by using a transparent film as the recording medium of the recording means, there is an advantage that an original image sheet for an optical projection system can be directly created, and the function as an electronic whiteboard device can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the electronic blackboard device according to the present invention, FIG. 2 is a perspective view showing its operation,
3 is a plan view showing the internal structure of the reading unit in FIG. 1, and FIG. 4 is a plan view showing another example of the reading unit. 1... Writing medium, 2, 3... Guide rail, 4
...Reading unit, 7...Light source, 9...Photoelectric conversion element array, 10...Recording means, 12, 13...
Transparent film, 14... OHP device, 20...
CCD image sensor.

Claims (1)

[Claims] 1. A writing medium on which images can be written and erased;
a reading unit that is provided to move along the surface of the writing medium and includes a light source that illuminates the writing medium and a reading means that optically reads an image on the writing medium and converts it into an electrical signal; and recording means for recording an image on the writing medium in a reduced size on a recording medium using an electric signal from the reading means as image information, the electronic whiteboard device comprising: an electronic whiteboard device for enlarging the image recorded on the recording medium onto the writing medium; an optical projection system for projecting images on the writing medium, and an opening in the reading unit for projecting an image from the optical projection system onto a reading position on the writing medium by the reading means when the reading unit moves; and energizing the light source of the reading unit.
It is characterized by comprising a switch means for turning ON/OFF, and when reading the image, the projected image and the written image on the writing medium are simultaneously read by the reading means while the light source is turned off by the switch means when reading the image. Electronic whiteboard device. 2. The electronic whiteboard device according to claim 1, characterized in that a transparent film is used as the recording medium.