JPH0116191Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention This invention relates to a display device for handwritten information in an information processing system, and relates to a device for displaying handwritten information on a screen using a video projector.

Background of the technology A device that converts handwritten information into electrical signals and projects them on a screen using a video projector.
It has been put into practical use under the name of electronic blackboard, and if this type of device is used, it is possible to directly project not only handwritten information but also image information from a computer on the screen. Information can also be stored as electrical signals and transmitted in real time to remote locations.

Prior Art and Problems As shown in FIG. 1, a conventional device of this kind is composed of a handwritten information input board 1, a video projector 2, and a control device 3 for transmitting information between the two. The handwritten information entered on the input board 1 (usually a digitizer is used) using the tablet 4 is projected on the screen 5 by the video projector 2, and the control device 3 is connected to the computer 6. , a communication device 7 , a printer 8 , etc. are connected so that various image information on the screen 5 can be processed, transferred, printed, etc.

However, in such conventional devices, the board 1 on which handwritten information is input and the screen 5 on which information is displayed are separate, resulting in poor operability, especially when information output from the computer 6 or the like on the screen 5. If an attempt is made to make additions and corrections by hand, it will be difficult to accurately match the entry position on the input board 1 with the desired position on the image of the screen 5. Furthermore, since the tablet 4 used for handwriting input to the input board 1 is connected to the control device 3 by the cord 9, the tablet 4 has poor operability and has the disadvantage that it is difficult to perform input operations smoothly. In addition, in the case of a color system, the color of handwritten input information is specified by providing a dedicated tablet for each color and selecting the tablet to be used, or by specifying the color from the operation panel of the control device 3. However, in both cases, the disadvantage was that the operations were complicated.

Purpose of the invention The purpose of this invention is to obtain a device that can easily input handwritten information in a more accurate position by making the handwritten information input surface and the information display surface the same surface. Furthermore, it improves the operability of the handwritten information input stick (corresponding to the tablet 4 of the conventional device), and also allows the handwritten information to be specified more easily in the color system. The purpose was to obtain an information input device.

Configuration of the Invention To explain using the reference numerals of the illustrated embodiments, the handwritten information input device of the present invention includes a transparent screen 1 of a rear projection video projector 10.
An optical device 16 for reading an image is provided on the side of the projector 12 of 1 to form an image of the light beam from the see-through screen 11 on the light receiving surface of the image sensor 19 through an imaging lens 17 and an infrared transmission filter 18. The moving trajectory of the infrared light emitter 21 on the perspective screen 11 is read by an image sensor 19, and the trajectory is projected as a visible image onto the perspective screen 11 by the projector 12 of the video projector. It is.

Embodiment of the invention Figures 2 and 3 are diagrams showing a first embodiment of the invention, with Figure 2 schematically showing the overall configuration of the device, and Figure 3 showing an information input stake. It is.

FIG. 2 generally shows 10 a rear projection type video projector, 11 a see-through screen, 12 a projector, 13 a projection lens, 1
Reference numeral 4 denotes a reflecting mirror, through which an image signal given from the control device 3 is transmitted to a see-through screen 11 by a projector 12.
A visible image is projected from the back side. A half mirror 15 is provided in the optical path of the projection light a of the video projector 10, and the projection light a from the projector 12 passes through this half mirror 15. The light rays directed toward the front are reflected by the half mirror 15, and the reflected light b passes through the imaging lens 17 and the infrared transmission filter 18 and enters the two-dimensional image sensor 19.

The imaging lens 17 is arranged to form an image on the screen 11 onto the light receiving surface of the two-dimensional image sensor 19, and the infrared transmission filter 18 blocks visible light and allows only infrared light to pass through. It is something. That is, an image or a bright spot on the transparent screen 11 is formed on the light-receiving surface of the two-dimensional image sensor 19, but the image projected onto the screen 11 from the projector 12 is in the visible region. Since it is an image, it is blocked by the infrared transmission filter 18 and is not received by the image sensor 19.

20 is a stake used to input handwritten information from the front side of the transparent screen 11 (the side where the image on the screen 11 is observed), and an infrared light emitting diode 21 is installed at the tip of this stake 20.
is installed. Infrared light emitting diode 21
is held by a holder 22, as shown in FIG. 3, and this holder 22 is attached to a stake body 24 via a pressure sensor 23. 25, indicated by a broken line, is a switch circuit built into the stake body 24, and 26 is a battery. When the tip of the stake 20, where the infrared light emitting diode 21 is provided, is pressed, the pressure sensor 23 detects the pressing force. The switch circuit 25 is activated, and the built-in battery 2
6 causes the infrared light emitting diode 21 to emit light.

A transparent screen 11 is shown at the tip of the stick 20.
When the infrared light emitting diode 21 is caused to emit light by applying pressure from the front side, a bright spot in the infrared region appears on the back side of the see-through screen 11 due to the light emission from the light emitting diode 21, and the light from this bright spot is transmitted to the half mirror 15. The light is reflected by the light, passes through the imaging lens 17 and the infrared transmission filter 18, and is received by the two-dimensional image sensor 19. Therefore, the position of the bright spot on the screen 11, that is, the position of the tip of the stake 20 is detected by the image sensor 19, and this detection signal is stored in the video RAM built in the control device 3. When the stake 20 is moved on the transparent screen 11, its movement trajectory is sequentially detected by the two-dimensional image sensor 19 and stored in the video RAM of the control device 3, so that the image signal from the video RAM is transmitted to the projector. 12
, the locus of the tip of the stake 20 will be projected on the screen 11 as a visible image. Note that a CCD type image sensor, which has been commonly used as an image sensor, can be used as the image sensor 19 of the present invention because it is sensitive to light in the near-infrared region.

As mentioned above, the infrared light emitting diode 21 attached to the stake 20 blinks when the tip of the stake 20 comes into contact with and leaves the screen 11, so it can be written on the screen 11 in the same way as writing in chalk on a conventional blackboard. If appropriate information is entered on the stake 20, it will be projected on the image screen 11 as a visible image. Since this handwritten information is stored in the control device 3 as an electrical signal, the computer 6
By connecting a computer, a printer 8, a communication device 7, etc., the handwritten information can be freely processed, transferred, and created as a hard copy using known means.

The color specification for handwritten information in the color system is as follows:
A color code generation circuit 27 is built into the stake 20, and the infrared light emitting diode 21 is blinked according to a color code corresponding to the color selected when the stake 20 is first pressed, and the image sensor 19 reads the color code. This can be done by In this case, the status 20
A selection switch 28 for specifying a color is provided. 2
9 is a dial ring of the selection switch 28.

When partially erasing the image on the screen 11, it is sufficient to operate the stake 20 with the designated color as the background color of the screen 11. When erasing an image, it is troublesome to accurately trace the part of the image to be erased with the thin tip of the stake 20, so when the background color is specified, the point specified by the tip of the stake 20 is used as the center. It is convenient to change all the images within a predetermined area to the background color, and the control device 3 is configured to set an appropriate erasing area based on the position information output from the image sensor 19. All you have to do is put together the software.

The stake 20 configured as described above transmits various information to the control device 3 using infrared light as a medium between the infrared light emitting diode 21 and the image sensor 19. There is no need to connect with
The operation of the stake 20 when inputting handwritten information becomes extremely easy.

In the embodiment shown in FIG. 2, the light beam from the screen 11 is reflected by a half mirror 15 and guided to the image sensor 19, but as shown in FIG. 4, the image sensor 19 is connected to a video projector. By shifting the half mirror 15 from the optical axis of the mirror 10, it is also possible to create a configuration in which the half mirror 15 is not used.

Effects of the invention As explained above, in the handwritten information display device of the present invention, the handwritten information input surface and the information display surface are on the same surface, making it extremely easy to input information and visually confirm the displayed information. Therefore, it is particularly easy to add and correct the displayed information by hand. Furthermore, the structure can be such that no code is connected to the stake for input operation, and there is an effect that input operation of handwritten information can be performed extremely easily even in a color system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional handwritten information display device;
Figures 2 to 4 are diagrams showing embodiments of the present invention. Figure 2 is a diagram showing the overall configuration of the first embodiment, and Figure 3 is a diagram showing a stick used for inputting handwritten information. , FIG. 4 is a diagram showing a second embodiment of the present invention. In the figure, 3 is a control device, 6 is a computer, 7 is a communication device, 8 is a printer, 10 is a rear projection type video projector, 11 is a perspective type screen, 12 is a projector, 15 is a half mirror, 1
6 is an optical device, 17 is an imaging lens, 18 is an infrared transmission filter, 19 is a two-dimensional image sensor,
20 is a stake, 21 is an infrared light emitting diode, 22 is a holder, 23 is a pressure sensor, 25 is a switch circuit, 26 is a battery, a is a projected light, and b is a reflected light.

Claims (1)

[Claims for Utility Model Registration] (1) Light rays from the see-through screen of a rear projection video projector are passed through an imaging lens and an infrared transmission filter to the light-receiving surface of an image sensor. An optical device for reading an image is provided, and an image sensor reads the moving trajectory of the infrared light emitter on the perspective screen, and the trajectory is made visible on the perspective screen by the projector of the video projector. A display device for handwritten information, which is characterized by projecting it as an image. (2) The handwritten information display device according to claim 1 of the utility model registration claim, in which the color of the visible image is specified by a blinking code of an infrared light emitter.