JPS648373B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an easy-to-operate partial erase mode detection method for electronic whiteboard devices, etc. The present invention relates to a drawing mode identification method that automatically identifies a partial erasing mode such as erasing.

[Conventional technology and problems]

Electronic blackboard devices allow you to write letters and figures on the input surface using a pencil or other writing instrument, and the input content is displayed on a remote monitor connected by telephone line, etc., making it useful for meetings and lectures. used. Therefore,
You can write freely like a regular blackboard or whiteboard,
It must be possible to freely erase a part that has already been input and displayed.

Conventionally, electronic whiteboard devices have two methods for erasing images displayed on a monitor: a full erase mode in which the entire displayed image is erased by operating a switch, and a partial erase mode in which a portion of the displayed image is erased using a blackboard eraser, etc. An erase mode is provided. When performing partial erasing on such an electronic whiteboard device, after entering the partial erasing mode by operating a switch,
When you erase the part you want to erase with a blackboard eraser, the corresponding part of the display surface is erased, or you can place the blackboard eraser in a certain position and detect that you have picked up the blackboard eraser from there. A method such as entering an erase mode is adopted. In these methods, when it is desired to perform partial erasure, it is necessary to press a switch, or it is necessary to return the blackboard eraser to a predetermined position after completing partial erasure. For this reason, compared to when performing partial erasing on a normal blackboard or whiteboard, the operation is complicated and it is difficult to use.

[Means for solving problems]

In order to solve these drawbacks, the present invention automatically enters partial erasure mode and performs partial erasure when the input surface is touched with a blackboard eraser, and the coordinates of the position where pressure is applied are detected. A coordinate detection means, a first electrode divided into two groups, and a second electrode or conductor facing the first electrode, wherein pressure is applied to a range of a predetermined size or more. means for electrically connecting the two groups of first electrodes; and means for detecting the presence or absence of conduction between the two groups of first electrodes and identifying a partial erase mode when the two groups are conductive. It is equipped with Hereinafter, examples will be described in detail with reference to the drawings.

〔Example〕

Usually, the input part of an electronic whiteboard device is a pressure-sensitive tablet, which detects the pressure of a writing instrument such as a chalkboard.
It detects the position coordinates of an input point. In partial erasing, the pressure of erasing the blackboard is detected and a processing operation is performed to erase the display of the corresponding part on the monitor screen. Hereinafter, the former state where writing is possible is referred to as "input mode", and the latter state where partial erasing is possible is referred to as "partial erasing mode".
It is called. The present invention provides pressure-sensitive tablets, etc.
This provides a means to easily detect both modes.

FIG. 1 shows an embodiment of the present invention, in which 1 is an input section of an electronic blackboard device, 2 is a first electrode group,
3 is a second electrode group; 4 is a partial erase mode detection circuit;
5 is a transmission section of the electronic whiteboard device; 6 is a first electrode of the first electrode group;
Terminal, 7 is also the second terminal, 61 is the first electrode group, 71 is the second electrode group, 8 is the first transmitter
The terminal, 9 is also the second terminal, 10 is the transmission line, 11
1 is an electronic whiteboard device receiving section, and 12 is a television monitor.

When inputted to the surface of the input section 1 using a stationary or similar device, the positional coordinate signal of the stationary station or the like is inputted to the transmitting section 5 via the terminal 8, converted into a signal suitable for transmission, and sent to the receiving section 11 through the transmission path 10. The received signal is converted into a signal suitable for display in the receiving section 11 and displayed on the television monitor 12.

The input section 1 has a flexible structure, and pressure at the time of input is transmitted to the first electrode group 2 and the second electrode group 3. Further, the first electrode group 2 also has a flexible structure, and the first electrode group 2 and the second electrode group 3 come into contact at the input point due to pressure at the time of input.

When inputting with an object with a relatively small contact surface such as a touch yoke, the first and second electrode groups 2 and 3
At most, contact is made at only one point, but when inputting with something with a relatively large contact surface, such as a blackboard eraser, the first and second electrode groups 2,
In No. 3, the electrode pitches of the first and second electrode groups are selected so that they contact each other at a plurality of locations at the same time.

In the first electrode group 2, every other electrode is connected in common, and in the embodiment shown in FIG. Each electrode group is connected to a terminal 7.

The partial erase mode detection circuit 4 detects whether or not there is electrical continuity between the terminals 6 and 7, and if there is electrical continuity, it sends a message to the transmitter 5 via the terminal 9 that it is in the partial erase mode. Inform. Since electrode groups 2 and 3 need to come into contact only when input pressure is applied, a suitable spacer or pressure-sensitive rubber sheet is usually inserted between them.
It is omitted in the figure.

Figure 2 shows in detail the state of contact caused by pressing between electrode groups 2 and 3, and a is a case where input is made with a chiyoke, etc., and the two contact at only one point at a time. When not, b indicates a case where input is made using a blackboard eraser, and a case where the screen is touched at multiple points at the same time.

In FIG. 2, 51 to 57 are the first electrode group, 4
1-47 are the second electrode group, 31 is a current source or voltage source, 32 is a resistor, 33 is a voltage detection circuit, 100-
103 represents an input point (a contact point between the first and second electrode groups).

In FIG. 2a, electrodes 54 and 42 are in contact only at input point 100. At this time, terminals 6 and 7 are open, no current flows through resistor 32, and therefore nothing appears at output terminal 9 of voltage detection circuit 33. On the other hand, FIG. 2b shows the case where the input section 1 is pressed with the blackboard eraser, and the input points 100, 101, 1
At 02 and 103, the first and second electrode groups 2 and 3 are in contact at the same time. At this time, the current flowing from the terminal 6 flows into the resistor 32 from the terminal 7 via the electrode 42 or 43. That is, the first electrode group 61 and the second electrode group 71 are in a conductive state. Therefore, in this case, a voltage is output to the output terminal 9 of the voltage detection circuit 33. By this,
It is possible to automatically identify the case where there is no output voltage at the terminal 9 as the input mode, and the case where there is an output voltage as the partial erase mode.

FIG. 3 shows an embodiment in which a conductor 300 is used instead of the second electrode group 3 shown in FIG.

For example, if the first electrode group 2 and the conductor 300 are in contact at a plurality of points simultaneously, such as the input points 100 to 103, the first electrode group 61 and the second electrode group 7
1 becomes conductive, a current flows between terminals 6 and 7, and an output voltage appears at terminal 9. However, when the first electrode group 2 and the conductor 300 are connected at only one point, such as the input point 100, for example, When in contact, the first electrode group 61 and the second electrode group 71 are in an insulated state, no current flows between the terminals 6 and 7, and no output voltage appears at the terminal 9.

In this manner, also in this embodiment, by detecting the output of the terminal 9, the input mode and the partial erase mode can be automatically distinguished.

In the above embodiment, the electronic whiteboard device input section 1 is mounted on the front surface, and the first electrode group 2 and the second electrode group 3 or the conductor 300 are mounted on the rear surface.
Alternatively, by making the conductor 300 have a flexible structure, the front and rear surfaces can be reversely mounted.

〔Effect of the invention〕

As explained above, it is possible to automatically identify whether the object that applied pressure to the input surface is a writing implement such as a chiyoke or a blackboard eraser. The written content is displayed on the monitor, and on the other hand, if the blackboard eraser is pressed, the corresponding display content can be erased (which can be thought of as being written in the background color) as a partial erasure mode. Further, when the partial erase mode ends, the mode automatically returns to the input mode.

As described above, according to the present invention, by erasing the part of the input surface that is desired to be erased using the blackboard eraser, the partial erase mode can be entered, and the partial erase mode can be changed to the input mode without any other switch operation. There is an advantage that when returning, there is no need to worry about the trouble of returning the blackboard eraser to the predetermined position.

Although the above explanation has been given using an example of an electronic whiteboard device that has a communication function, the present invention is also applicable to an electronic whiteboard device that does not have a communication function and only records the content drawn on the input section of the electronic whiteboard device by outputting a hard copy or using a floppy disk. It can also be applied to blackboard devices. Furthermore, it is clear that the present invention can be similarly applied to electronic whiteboards and pressure-sensitive tablets in addition to electronic whiteboards.

[Brief explanation of drawings]

FIG. 1 is an embodiment of the present invention, FIG. 2 is a detailed diagram of the first electrode group, second electrode group, and partial erase mode detection circuit of the embodiment shown in FIG. 1, and FIG. 3 is a detailed diagram of another embodiment of the present invention. An example is shown. DESCRIPTION OF SYMBOLS 1...Electronic whiteboard device input section, 2...First electrode group, 3...Second electrode group, 4...Partial erase mode detection circuit, 5...Electronic whiteboard device transmitter, 6...First
1st terminal of electrode group, 7...2nd terminal of first electrode group, 8...1st terminal of transmitting section, 9...2nd terminal of transmitting section, 10...transmission line, 11...electronic whiteboard device reception Part, 12...TV monitor, 51-57...1st
Electrode group, 41-47... Second electrode group, 31... Current source or voltage source, 32... Resistor, 33... Voltage detection circuit, 61... First electrode group, 71...
Second electrode group, 100 to 103...input point,
300...Electric conductor.

Claims (1)

[Scope of Claims] 1. An input position detection device having coordinate detection means for detecting the position coordinates of pressure applied to an input surface by an input tool, the input position detection device having at least two different pressure areas.
In a drawing mode identification method in an input position detection device that identifies a mode corresponding to the type of input tool, every other electrode is arranged in first and second electrode groups on the front or rear surface of the coordinate detection means. It has a first electrode group in which the electrodes in the group are connected respectively, and a second electrode group in which one end is connected in common.
electrode group or a plate-shaped conductor, the interval between adjacent electrodes between the groups in the first electrode group is larger than the width of the pressure range applied to the input tool with a small pressure area, and The first electrode group and the second electrode group in the first electrode group are arranged so that the width of the pressure range applied by the input tool is smaller than the width of the pressure range applied by the input tool, and the position is input by the input tool with a large or small pressure area. When the coordinate detection means
Detecting the input position coordinates and determining whether or not the first electrode group and the second electrode group in the first electrode group are electrically connected via the second electrode group or the plate-shaped conductor. A drawing mode identification method characterized in that a mode is identified by.