JPH0329193Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to an electronic blackboard device that prints information such as characters and figures written on a writing board. The present invention relates to an electronic blackboard device with a projection display that identifies information such as characters and figures on a tablet, displays the information on a liquid crystal display, and enlarges and projects the display onto a screen.

[Technical background of the invention]

2. Description of the Related Art Various types of electronic blackboard devices are available that print information by writing arbitrary characters or figures on an erasable writing board using a marker or the like. Such an electronic blackboard device is convenient because the information written on the blackboard can be obtained as a hard copy by operating a switch, and the organizer or the audience does not need to transcribe the information on the blackboard each time. However, when giving a lecture or research presentation in a large venue to a large audience, there is no need to distribute copies to the audience, and copies are distributed only to the organizer or speaker. Even if an electronic blackboard device is used, people sitting at the back of the venue may not be able to read the characters on the blackboard. In such cases, explanations are performed while enlarging and projecting a previously prepared manuscript onto a screen using a projector.

Conventional projectors of this type are designed to place a transparent film with characters and figures written on it on a magnifying reflector, and then enlarge and project the data and figures on the film onto a screen. Therefore,
The lecturer had to write the necessary data on the film in advance, which not only took time but also had drawbacks such as making it difficult to revise the manuscript.

The applicant previously filed Japanese Patent Application No. 59-41376
In 186924), a coordinate input device with a display was proposed in which a liquid crystal panel was mounted on a tablet and displayed positional coordinates designated by a magnetic pen or the like or image information based on the coordinates. This device has the advantage that arbitrary data can be entered with high precision simply by operating an input pen on the display, and the input results can be immediately confirmed on the display.

[Purpose of invention]

The purpose of this invention is to focus on the advantages of the earlier invention mentioned above, and to obtain the image information visibly written on the writing board as a hard copy using the principle of the conventional electronic blackboard device, as well as to obtain it through the tablet and display. To provide an electronic blackboard device with a projection display that can be used even in a large venue by enlarging projection onto a screen.

[Structure of the idea]

The electronic blackboard device with a projection display of this invention includes a writing board for handwriting input that can be used repeatedly, and a tablet located on the back side of the writing board that detects information on characters and figures written on the writing board as coordinate position information. electronic blackboard means, input means for visibly displaying information on the writing board and inputting coordinate position information corresponding to the information into the tablet, and erasing information on the writing board and coordinate position information on the tablet. a liquid crystal display means capable of displaying positions corresponding to the coordinate positions of the tablet; and a control means for driving the tablet, identifying the coordinate positions of the input means and the erasing means, and controlling the operation of the liquid crystal display means. The present invention is characterized by comprising: a printer for printing information inputted by an input means; and a projection means for enlarging and projecting an image displayed on a liquid crystal display member onto a screen.

〔Example〕

Hereinafter, an embodiment of this invention shown in the drawings will be described. A support arm 3 whose lower end is attached to a base case 1 via a support shaft 2 etc. has a light source 4, two reflecting mirrors 5, 6, and convex lens 7
A projector case 8 that accommodates the is attached. The light from the light source 4 is configured to illuminate the upper surface of the base case 1 through a lower opening 9 by a reflecting mirror 5. Although not shown, a condenser lens is provided between the light source 4 and the reflecting mirror 5.

A well-known transmissive liquid crystal display 11 is provided on the upper surface of the base case 1, which is exposed to the light from the light source 4, and includes a plurality of crossed horizontal electrodes and vertical electrodes with a liquid crystal medium interposed therebetween. A flat concave mirror 12, the details of which are shown in FIG. 2, is arranged on the lower surface of the liquid crystal display 11.

As shown in FIG. 2, the concave mirror 12 has a large number of concentric grooves 14 formed at a fine pitch on the upper surface of a thin aluminum substrate 13 with a thickness of approximately 1 mm, and the surface of each groove 14 is inclined toward the center. It is made up of surfaces. A transparent synthetic resin coating layer 15 is provided to cover these grooves 14, and this makes the concave mirror 1
The top surface of 2 is flat. Therefore, the refraction caused by the concave mirror 12 is very small, and the image information displayed on the liquid crystal display 11 is reflected without being distorted. By this concave mirror 12, the light from the light source 4 is reflected by the reflecting mirror 5 and the concave mirror 12, focused by the convex lens 7, and projected onto the screen 10 by the reflecting mirror 6, which is supported so that its angle can be adjusted.

The liquid crystal display 11 is driven by a control circuit 17 that processes coordinate data from the electronic whiteboard device 16 and a processing device 18 that sends the data from the control circuit 17 to the liquid crystal display 11 and displays the data. controlled.

The electronic blackboard device 16 is composed of a handwriting section 19 and a tablet section 20 located on the back side of the handwriting section 19. As shown in the cross section of FIG. 3, the handwritten portion 19 includes a base material 21 made of a flat plate made of asbestos calcium silicate, urethane foam, etc., and a non-magnetic material such as aluminum or austenitic stainless steel attached to the top surface of the base material 21. It has a writing board 22 made up of a body. The tablet portion includes a plurality of X-direction magnetostrictive transmission media 23 arranged at predetermined intervals in the X direction, a plurality of Y-direction magnetostriction transmission media 24 arranged at predetermined intervals in the Y direction, and It has a magnetostrictive transmission medium 23 and a spacer 25 arranged between the Y-direction magnetostrictive transmission medium 24. A back plate 26 is attached to the back surface of the Y-direction magnetostrictive transmission medium 24. The surface of the writing board 22 is smoothed by enameling, for example, so that it can be written with a marker 27 shown in FIG. 4 or erased with an eraser 28 shown in FIG. 5.
The magnetostrictive tablet 20 is disclosed, for example, in Japanese Patent Application No. 144227/1983 (Japanese Patent Application Laid-Open No. 1983-1980) filed by the present applicant.
221820), so its explanation will be omitted. It goes without saying that the tablet may be of the electromagnetic induction type as described in Japanese Patent Application No. 59-41376 mentioned above.

As shown in FIG. 4, the marker 27 includes a cylindrical case 29 made of non-magnetic metal, an ink chamber 30 housed in the case 29, and a case 29.
One end protrudes from the tip of the tablet 20, and the other end has a writing core 31 located inside the ink chamber 30, and a central through hole so that the core 31 passes through the center, and transmits magnetic flux to the tablet 20. A permanent magnet 32 having a substantially truncated conical shape is provided for applying the force. Ink chamber 3
0 and the core material 31 are written on the writing board 22 with the marker 27.
It is housed in a case 29 so as to be slidable so as to be retracted by the pressure of the pen when characters or the like are written on it.
At the rear end of the ink chamber 30 in the case 29, there is a switch 3, such as a push button type micro switch, which is operated when the ink chamber 30 retreats.
3, and a light emission control unit 34 for emitting light unique to the marker 27 by the operation of the switch 33 and, for example, infrared light, to the outside, a battery, and a light emitting element (both not shown). A light emitting section 35 is housed therein.

As shown in FIG. 5, the eraser 28 has a structure similar to that of a conventional eraser in which an erasing material 37 such as a sponge is provided on the bottom surface of a roughly oval hollow case 36 made of synthetic resin. The difference is that a battery and a light emission control unit (both not shown) are housed in the unit. Also, inside the case 36 are a permanent magnet 32 of the marker 27, a switch 33, a light emitting control section 34, a permanent magnet for position detection having the same function as the light emitting section 35, a switch, and a light emitting section (all not shown). are provided at both ends. A light emission control section (not shown) having the same function as the light emission control section 34 of the marker 27 is also provided in the case 36, and the light emission control section and the battery of the light emission section are connected to switches and light emitting elements at both ends. It's starting to be shared. case 36
Windows 38 are provided at both ends. These windows 38 emit infrared rays modulated in accordance with each switch. When both switches are pressed at the same time, a correspondingly modulated infrared ray is emitted.

Next, the tablet 20 and the liquid crystal display 11
The operation control will be explained with reference to FIG. The tablet control circuit 41 controls the tablet 20, the X-direction multiplexer 42, and the Y-direction multiplexer 4.
3, the voltage induced by electromagnetic induction is detected by the detection line in the tablet 20, and the locus of the figure or character is used as the X and Y coordinates, and the voltage is transmitted through the The induced voltage of the lever is sent to the control circuit 17.

In the control circuit 17, the induced voltage is amplified by an amplifier 51, rectified into a DC voltage by a detector 52, and further converted into a digital value by an analog-to-digital (A/D) converter 53. This digital signal is applied to an arithmetic processing circuit 55 via an input buffer 54. The arithmetic processing circuit 55 performs arithmetic processing using the previous sample induced power (digital other value) temporarily stored in the memory 56 and the data taken in from the input buffer 54, and calculates the X coordinate value or the Y coordinate value.
Determine coordinate values. This arithmetic processing circuit 55 also sends control signals to the X-direction and Y-direction multiplexers 42 and 43 via an output buffer 57.
An amplifier 51 alternately generates induced voltages in the X direction and Y direction.
Send to. The drive power supply 58 supplies a sinusoidal current to the excitation line of the tablet 20.

For the timing signal supplied to the input buffer 54, infrared rays from the marker 27 or the eraser 28 are received by, for example, a light receiving section provided in the electronic blackboard device 16, and an output signal of this light receiving section is used. This timing signal is applied to the tablet 20 only while the marker 27 is drawing figures or characters on the handwriting section 19 and while the eraser 28 is erasing them.
The data from the arithmetic processing circuit 55 is transferred to the processing device 1.
Send on 8th.

The position data consisting of coordinate values in the X and Y directions sent to the processing device 18 is sent to the display drive circuit 6.
It is also sent to the display memory 63 via the display control circuit 62 of 1, and is arranged and stored in a certain order.
The signals are sequentially read out and output to the X-direction driver 64 and the Y-direction driver 65 according to timing pulses from . A scanning pulse generated by a scanning circuit 66 in synchronization with the timing pulse is input to the X direction driver 64 and the Y direction driver 65, and each driver 64, 65 corresponds to the coordinates of the liquid crystal display 11 in the X direction and Y direction. The position indicated on the tablet 20 is displayed at the same position on the liquid crystal display 11.

In this way, mark 2 on writing board 22.
The handwriting of figures and characters drawn by 7 is displayed as the same handwriting by a visible display on the liquid crystal display 11. The display on the liquid crystal display 11 is projected onto the screen 10 by light from the light source 4. Further, this display can be monitored by a monitor 71 connected to the processing device 18, and a printer 7 also connected to the processing device 18.
2 can also be obtained as a hard copy.

By adding a character editing function to the processing device 18, it is possible to modify, add, or delete input characters. Furthermore, if a graphic processing function is added, it is possible to use CAD, CAM, etc., so it is possible to display not only handwritten characters and figures, but also sentences and figures prepared in advance. Furthermore, the position data sent to the processing device 18 can also be recorded on a floppy disk.

When the eraser 28 is used to erase characters, figures, etc. written on the writing board 22 with the marker 27, or to correct a part of the writing, the eraser 28 erases the marker 2 using the erasing material 37 of the eraser 28.
The characters written in step 7 are erased, and the control circuit 17 is instructed to erase the position information already detected by the tablet 20 by the infrared rays from the eraser 28. Then, the coordinate values of the part designated by the magnet of the eraser 28 are erased, and only the remaining coordinate positions are displayed. In this embodiment, the eraser 28 is provided with two position detection magnets, both of which are attached to the writing board 22.
When the two parts are in contact with each other, the control circuit 17 calculates the position of a straight line connecting each part from the coordinate values regarding these two parts, sets an erasing range based on this straight line, and erases as this straight line moves. The location is calculated and the corresponding coordinate value among the accumulated coordinate values is deleted.

In the above embodiment, the tablet 20 is of magnetostrictive type, but it goes without saying that it may be of electromagnetic induction type or capacitance type. Although infrared rays are used as the timing signal, wired or wireless radio waves may also be used. Furthermore, in order to make the projection on the screen clearer, if the surroundings are darkened, only the writing board 22 may be illuminated with spot light.

[Effect of idea]

As described above, the electronic blackboard device with a projection display of this invention comprises an electronic blackboard as a tablet, displays image information added to the tablet on a liquid crystal display, and projects the display on the liquid crystal display onto a screen. Therefore, depending on the size of the venue, you can use only the electronic blackboard or project it on a screen. By using a tablet, it is also possible to display data on figures, tables, etc. that have been input in advance to an external storage device, or to combine the information on the writing board with the information in the external storage device and project it on the screen.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view schematically showing an embodiment of this invention, Fig. 2 is a diagram showing details of the concave mirror and the optical system path, and Fig. 3 is a sectional view showing a part of the electronic whiteboard device. , FIG. 4 is a cross-sectional view schematically showing the marker, FIG. 5 is a perspective view showing the eraser, and FIG. 6 is a block diagram showing a drive circuit for the tablet and liquid crystal display. In the drawing, 4 is a light source, 11 is a liquid crystal display, 12 is a concave mirror, 16 is an electronic whiteboard device, and 17
is a control circuit, 18 is a processing device, 19 is a handwriting section,
20 is a tablet.

Claims (1)

[Claims for Utility Model Registration] (1) A writing board for handwritten input that can be used repeatedly, and information on characters and figures written on the writing board located on the back side of the writing board to be detected as coordinate position information. electronic whiteboard means comprising a tablet; input means for visibly displaying the information on the writing board and inputting coordinate position information corresponding to the information into the tablet; an erasing means for erasing the coordinate position information of the tablet; a liquid crystal display means capable of displaying positions corresponding to the coordinate positions of the tablet; and a liquid crystal display means for driving the tablet and displaying the coordinate positions of the input means and the erasing means. a control means for identifying and controlling the operation of the liquid crystal display means; a printer for printing the information inputted by the input means; and an enlarged image displayed on the liquid crystal display member for projecting onto a screen. 1. An electronic blackboard device with a projection display, characterized in that it has a projection means. (2) Utility model registration In claim 1, the input means is characterized in that an element for indicating a coordinate position to the tablet is integrated into an ink pen for writing on the writing board. Electronic blackboard device with projection display. (3) In claim 1 of the utility model registration claim, the erasing means includes an erasing tool for erasing entries on the writing board and an instruction signal generating means for erasing coordinate positions already indicated on the tablet. An electronic blackboard device with a projection display, characterized in that it is incorporated in.