JPS62227259A - Electronic blackboard device - Google Patents

Abstract

PURPOSE:To synthesize and visualize a displaying image and an image described on a board part, by projecting light from the rear plane of the display means of a picture data stored in a storage means, and projecting transmitted light on a light transmissive board part. CONSTITUTION:A board part l is made of a thin plate shaped light transmissive glass, or a synthetic resin, etc., and a character, or a graphic can be described by a marker pen, etc., on the board. A display part 4 consists of a liquid crystal panel having a dot matrix constitution, and displays a content stored in a RAM card. The light projected from a lamp 5 is condensed by a lens 6, then being irradiated on the display part 4. and thc transmitted light is condensed by a lens 7, then being reflected on a mirror 8, and furthermore, it is reflected on the board part 1 by a mirror 9. Consequently, the image displayed on the display part 4 is projected the board part l, which can be visualized from the outside. Also, image sensors are mounted over the whole of the height directions of the board part l. An arm 10 stays at a home position at an ordinary time, and performs a scanning at a printing time, and the image described or project ed on the board part l is read by the sensor, then being printed by a thermal printer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electronic whiteboard device that directly copies characters, figures, etc. written on a board.

[Traditional technique]

In recent years, stand-alone electronic whiteboard devices have been developed and are suitably used in meetings and other events. The electronic whiteboard device sequentially reads handwritten characters, figures, etc. using a one-dimensional image sensor such as a CCD line sensor, binarizes the sensor output into white and black to create print data, and then uses a thermal printer, etc. It is used for printing.

By the way, electronic blackboard devices mainly use a winding method in which the blackboard writing surface is composed of a rolled sheet and the sheet is read by a fixed image sensor when the sheet is rolled up, and the other is a winding method in which the image sensor itself moves on the blackboard writing surface. There are two main types of sensor movement methods:

[Problems with conventional technology]

However, with the above-mentioned sensor movement method, if you want to explain again using a previously described screen at a conference or the like, there is only one screen □, so it is necessary to write that screen again. Further, in the case of a winding type, for example, two to five screens can be provided, so that the rolled sheet can be rewound to a desired screen position and the explanation can be made using that screen again. However, if there is no desired screen among the 2 to 5 screens and the screen has already been erased, it is necessary to restore the screen in the same manner as described above. Furthermore, in meetings, etc., it is often used to write numbers in a predetermined format, and in such cases, regardless of whether the winding method or sensor movement method described above is used, it is necessary to write a table or other format each time. It was inconvenient because it had to be written down.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and it is possible to display previously described images and formants such as arbitrary tables, and furthermore, the displayed image and the image written on the board can be combined and visually recognized. Furthermore, it is an object of the present invention to provide an electronic YA temporary device that can print the composite image.

[Summary of the Invention] In order to achieve the above object, the present invention displays image data stored in a storage means on a display means, and projects light from the back side of the display means, thereby transmitting the transmitted light. The image is projected onto a light-transmitting board. With this configuration, the image of the display means can be displayed on the board section, and the displayed image and the image written on the board section can be combined and visually recognized.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1(a) is a front view showing the electronic whiteboard device of the present invention;
FIG. 1 (bl is a sectional view taken along line 1-1 of FIG. 1 (al).

In FIG. 1, reference numeral 1 denotes a board section, which is made of a thin plate of light-transmitting glass, synthetic resin, or the like. The board part 1 is arranged on the front side of the frame 3 supported by the leg parts 2.2, and allows characters and figures to be written on it using a marker pen or the like. The inside of the frame 3 is hollow, and a display section 4 made of a liquid crystal display panel is arranged at a lower position.

The display unit 4 is a liquid crystal display panel having a donmatrix configuration, and displays the contents stored in the RAM card, which will be described in detail later. Furthermore, sealed spaces are formed on the front and back surfaces of the display section 4, respectively, and the display section 4 is attached to a partition wall 4a that isolates the sealed spaces. A lamp 5 is disposed at the innermost part of the closed space located on the back surface of the display section 4, and a lens 6 for irradiating light is disposed in front of the lamp 5. Thereby, the light projected from the lamp 5 is condensed by the lens 6 and irradiated onto the display section 4. Further, a lens 7 is disposed at the innermost part of the closed space located in front of the display section 4, and is configured to condense the light transmitted through the display section 4. The light focused by the lens 7 is
The reflected light is further reflected by a mirror 9 placed at the top of the frame 3 to the board part l. Therefore, the image displayed on the display section 4 is projected onto the board section 1, and this projected image can be visually recognized from the outside.

On the front surface of the board section 1, there is an arm 10 that scans in the direction shown in the figure.
An image sensor, which will be described later, is attached to the inner wall surface of the board l along the entire height direction of the board l. Note that a COD (charge coupled device) was used as the image sensor.

The arm 10 normally stands still at the home position shown in FIG. 1(a), and when printing, it scans in the direction shown in the drawing as described above. During this scanning, the image written on the board section 1 and the image projected onto the board section 1 are read by the image sensor. The read image is printed by a thermal printer as described later.

Reference numeral 11 denotes an operation section consisting of a keyboard, and printing instructions and instructions on the number of print sheets can be given at any time by operating the keyboard of the operation section 11.

Reference numeral 12 is a RAM card that can store, for example, images previously written on the board 1 or images in any format such as a table. By connecting this RAM card 12, the stored contents can be transferred to the display section. 4 can be displayed,
Moreover, it can be projected onto the board section 1. Conversely, an image read by an image sensor, such as an image written on the board section 1, can also be stored in the RAM card 12. Furthermore, 13 is a paper ejection tray, and the printed paper is ejected to the paper ejection tray 13.

FIG. 2 shows a control device for the electronic whiteboard device of the above embodiment.

In the figure, 14 is a CPU (central processing unit) that controls the entire electronic whiteboard device. During a reading operation, the CPU 14 first outputs a reading start signal to the timing control circuit 15 and also sends a command signal to the lighting circuit 16 to turn on the lamp 5.
Output to. Timing control circuit 15 receives the reading start signal and sends a command signal for driving motor 18 to motor drive circuit 17 . The motor 18 is connected to the arm 10.
The rotational motion of the motor 18 is converted into linear reciprocating motion of the arm 10 by a mechanism not shown. Therefore, when the arm 10 is scanned, the image sensor 19 provided on the inner wall surface of the arm 10 also moves together with the arm 10. On the other hand, the timing control circuit 15 sends a read lock signal to the sensor drive circuit 20 at the same time as the drive signal for the motor 18 . The sensor drive circuit 20 turns on the image sensor 19 in synchronization with this clock signal, and the image sensor 19 receives the light emitted from the lamp 5 and transmitted through the display section 4 and the board section 1 while scanning. Thereby, the image sensor 19 outputs image data obtained by converting the optical signal into an electrical signal.

This image data is synchronized with the read lock signal and
Data corresponding to dots is output for each line in units of dots. In this case, the image sensor 19 reads the image written on the board section 1 and the image projected onto the board section 1. Furthermore, since the image data output from the image sensor 19 is analog data proportional to the amount of incident light, it is amplified to an amplitude value within a predetermined range by an amplifier 21 and then converted to a digital signal by a binarization circuit 22. Ru. The binarization circuit 22 slices the analog signal at a predetermined slice level and binarizes the analog signal into a bit serial signal. The binarized image data is sent to an S/P (serial/parallel) conversion circuit 23, and the S/P conversion circuit 23 converts the binarized bits according to a timing signal input from the timing control circuit 15. Serial image data is converted into, for example, an 8-bit parallel signal. The converted parallel signal is then taken into the line memory 24.

The CPU 14 reads the image data stored in the line memory 24 and sends it to the compression/expansion circuit 25 in units of 8 bits. The compression/expansion circuit 25 is a circuit that performs data compression or expansion using the binarized image data. Binarized data is data in which black or white of image information corresponds to "l" or "O". Generally, white and black parts are read in dot units, but the black and white areas of image information have a wide range compared to their resolution, and binary data has a series of "0s" or 1s. .Compression/expansion circuit 2
5 detects the consecutive dots of "O" or "1" and converts them into data representing the number of consecutive dots of 'O' or "1" to compress the data. The compression/expansion circuit 25 has a function of converting compressed data into original dot data, and when printing is performed, the data is converted back into dot data.

The data compressed by the compression/expansion circuit 25 is stored in a compressed data memory 26. In this case, when storing compressed data in the RAM card 12, the data can be stored in the RAM 12 by giving an instruction using the keyboard of the operation unit 11.
can be stored in.

Furthermore, when performing printing, the image read by the image sensor 19 can be printed by giving an instruction using the operation unit 11 in the same manner. At this time, the CPU 14 reads out the compressed data stored in the compressed data memory 26, and the compression/expansion circuit 25 converts the compressed data back into the original dot data. Then, the printer 23 prints the data under the control operation of the print control circuit 27.

The printer 28 is a thermal printer using a thermal head.

On the other hand, when displaying the image data stored in the RAM card 12 on the display section 4 and projecting it onto the board section 1, C
The PU 14 reads the image data stored in the RAM card 12 and stores it in the liquid crystal display data memory 29. The data stored in this liquid crystal display data memory 29 is CP
The data is read out again at tJ14, and converted into the original dot data by the compression/expansion circuit 25 in the same manner as described above. C.P.
When U14 reads data from the liquid crystal display data memory 29, it sequentially reads out each line of the liquid crystal display panel constituting the display section 4. Then, the CPU 14 sequentially stores data for each line in the segment buffer 30, and sends a signal to the common driver 32 to select a line on the display section 4.

Segment 1-driver 31 is segment buffer 30
This circuit drives the display section 4 using data stored in the common driver 32, and each dot on the line selected by the common driver 32 is driven. As a result, the liquid crystal display data memory 2
The data stored in the display section 9 is displayed on the display section 4 by sequentially driving each line one line at a time. The image displayed on the display section 4 is
projected on top.

As described above, the memory contents stored in the RAM card 12 are displayed on the display section 4, and the transmitted light of the light emitted from the back surface of the display section 4 is projected onto the board section 1, so that the contents are displayed on the display section 4. The image thus obtained can be projected onto the board section 1. Therefore, the board section 1 is stored in the RAM card 12 in advance.
By storing an image described in , or image data in an arbitrary format such as a table, the image can be projected onto the board section 1, and the projected image can be used to give an explanation at a meeting, etc. . Furthermore, when projecting an image such as a table onto the board section 1, numbers etc. can be written while the table is projected, so there is the problem that the table must be written on the board section 1 each time as in the past. points can be resolved.

Furthermore, when reading the image on the board section 1, the board section 1
The image projected on the board 1 and the image written on the board section 1 are both read. Therefore, an image obtained by combining both images can be printed, and in particular, an arbitrary image such as a table can be printed on the display unit 4 as described above.
It can be effectively used when composite printing is performed by displaying numbers on the board section 1 and writing numbers or the like on the board section 1.

In addition, as a method of writing to the RAM card, it is also possible to input data using a tablet, a word processor, or a personal computer.

Particularly when a word processor is used, the displayed characters and the like are in printed font, making it easy to see.

〔Effect of the invention〕

As explained above, according to the present invention, the memory contents stored in the storage means are displayed on the display means consisting of a liquid crystal display panel, and the transmitted light of the light irradiated on the display means is projected onto the board part, so that the display A display image of the means can be projected onto the board part.

Therefore, by storing images written on the board in the past and image data of formants such as tables in the storage means, the images can be projected onto the board, even though it is an electronic blackboard. , OFI P, etc.
It can also be used as Ji. Furthermore, when reading the image on the board, the projected image on the board is also read, so a composite image of the image written on the board and the image projected onto the board can be printed.

[Brief explanation of drawings]

Figure 1 (b) is a front view of one embodiment of the present invention;
1 is a sectional view taken along line I-1 in FIG. 1(a), and FIG. 2 is a block diagram of the electric circuit of the above embodiment. DESCRIPTION OF SYMBOLS 1... Board part, 4... Display part, 5... Lamp, 6.7... Lens, 8.9... Mirror, 10... Arm, 12... RAM card, 14 ...CPU. 19...Image sensor, 28...Printer. Patent applicant Casio Computer Co., Ltd. Figure (b) 1

Claims (2)

[Claims] (1) An electronic whiteboard device comprising: a reading means that moves over a board part and reads an image written on the board part; and a printing means that prints the image on the board part based on the output of the reading means. The board section is made of a light-transmissive plate-like body, and a display means consisting of a liquid crystal display panel for displaying the memory contents stored in the memory means is provided, and light is emitted from the back surface of the display means, and the An electronic whiteboard device characterized in that transmitted light is projected onto the board section. (2) The electronic whiteboard device according to claim 1, wherein the printing means prints a composite image of the image projected onto the board and the image written on the board.