JPS648372B2 - - 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]

An electronic whiteboard device is a device in which characters and figures are written on the input surface using a pencil or other writing instrument, and the input content is displayed on a remote monitor connected by a telephone line, etc., and is used for meetings, lectures, etc. It will be done. 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. Therefore, 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 a partial erasing mode and performs partial erasing when the input surface is touched with a blackboard eraser. In addition to the parallel electrode group and the second parallel electrode group, a third electrode group and a fourth
A third electrode group has one end commonly connected, and a fourth electrode group is divided into two groups, and input is performed by a device different from a normal input device such as a blackboard eraser. A current is made to flow between the two groups of the fourth electrode group via the third electrode group only when the third electrode group is the same. A detailed description will be given below with reference to the drawings.

〔Example〕

Normally, the input part of an electronic whiteboard device is a pressure-sensitive tablet, which detects the pressure of a writing instrument such as a pencil.
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 "partial erasing mode".
It is called. The present invention provides a means for easily detecting both modes in a pressure sensitive tablet or the like.

Hereinafter, before describing embodiments of the present invention, in order to clarify the characteristics of the present invention, examples of conventional systems related to the present invention will be explained in detail with reference to FIGS. 2 to 4. do.

FIG. 2 is a perspective view showing the configuration of a conventional electronic whiteboard device input section, in which 1 is an insulating substrate, 2 is a first parallel electrode group, 3 is a flexible second parallel electrode group, 4
5 is a first resistor in contact with one end of the first parallel electrode group 2; 5 is a second resistor in contact with one end of the second parallel electrode group 3; 6, 7, and 8, 9;
are electrodes provided on the first and second resistors 4 and 5, respectively. 10 is a flexible insulating substrate, and 11 is a pressure-sensitive rubber sheet that is electrically conductive only in the vicinity of a pressed point. Moreover, a, b, c, and d are terminals provided at both ends of the electrodes 6, 7, 8, and 9, respectively, and W indicates an input surface.

FIG. 3 is a configuration diagram showing details of the first parallel electrode group 2, in which electrodes Y ₁ , Y ₂ , ..., Y _N are arranged on the insulating substrate 1.
are arranged in parallel. Further, the second parallel electrode group 3 in FIG. 1 is similarly constructed by arranging electrodes X ₁ , X ₂ , . . . , X _M in parallel on an insulating substrate 10. The first parallel electrode group 2 and the second parallel electrode group 3 are orthogonal to each other, and both parallel electrode groups 2, 3
are facing each other on the inside, there is a pressure sensitive rubber sheet 11 between the first parallel electrode group 2 and the second parallel electrode group 3, and the input surface which is the back surface of the second parallel electrode group 3 When a character or a figure is written on W, conduction occurs at the point where the pressure-sensitive rubber sheet 11 is pressed by the pen pressure, and one electrode in each of the first parallel electrode group 2 and the second parallel electrode group 3 becomes conductive. I'm starting to do that.

Figure 4 is a detailed diagram of a position detection circuit used in the input section of a conventional electronic whiteboard device, in which 12 is a constant current source, 13 and 14 are operational amplifiers, 15 and 16 are microresistors, and 17 and 18 are each an X output. terminal, Y output terminal. 19 is a current detection circuit, and 20 is a pen down output terminal. Note that other symbols indicate the same parts as in FIG. 2.

To operate this, characters, figures, etc. are written, for example, with a pen, on the input surface W, which is above the portion where the first parallel electrode group 2 and the second parallel electrode group 3 overlap in FIG. Then, the pressure-sensitive rubber sheet 11 becomes electrically conductive due to the pressure of the pen.
One electrode in each of the second parallel electrode group 3 and the first parallel electrode group 2 is electrically connected.

Therefore, as shown in FIG. 4, the x-coordinate and y-coordinate can be detected by the currents flowing in and out of terminals a and b, and the currents flowing in and out of terminals c and d.

In contrast to the conventional method described above, the present invention is configured as follows.

FIG. 5 shows a first parallel electrode group according to the present invention, in which in addition to the parallel electrode groups Y ₁ to Y _N shown in FIG. 3, new electrode groups Q ₁ to Q _R are constructed on the insulating substrate 1. has been done. The distance between the electrode Q _i and the electrode Q _i+1 is selected to be smaller than about 1/2 of the dimension of a blackboard eraser, and sufficiently larger than the dimension of the input point of the pencil yoke or felt-tip pen. Furthermore, the parallel electrode groups Q ₁ to Q _R are s ₁ to s _M , t ₁ to t _M
As shown in Figure 2, the area is covered with an insulator at a certain distance.

On the other hand, between the electrodes X _{1 ,} X ₂ , _{. . .} , P _L is newly provided and has a configuration similar to that shown in FIG. 5, and is used as a second parallel electrode group. The spacing between electrode P _i and electrode P _i+1 is also selected from the same technical viewpoint as the spacing between electrode Q _i and electrode Q _i+1 , and similarly, even at a certain spacing, it is necessary to cover the electrode with an insulator. ing.

FIG. 1 shows the configuration of an input section of an electronic whiteboard device according to the present invention. Components similar to those in FIG. 2 are given the same numbers and their explanations will be omitted.

As is clear from FIG. 1, the configuration in which the first parallel electrode group and the second parallel electrode group are opposed to each other
Similar to the one shown in the figure, but with a new electrode group Q ₁
The difference is that ~Q _R , P ₁ ~ _PL are provided. Y ₁
~Y _N , X ₁ ~X _M are connected to the first resistor 4 and the second resistor 5, respectively, but the newly added third and fourth electrode groups Q ₁ ~Q _R , P ₁ to P _L are not connected to these resistors. The insulators s ₁ to s _M configured on the electrode Q ₁ are connected to the electrode Q ₁ and each electrode X ₁
~ _XM are always insulated, and even if pressure is applied, the electrode _Q1 will not be electrically connected to any of the electrodes _X1 ~ _XM . Further, the insulators t ₁ to t _M of the electrode Q _R provide insulation between the electrode Q _R and each of the electrodes X ₁ to X _M.

Similarly, insulators u ₁ to u _N on electrode P ₁ insulate electrode P ₁ from each electrode Y ₁ to Y _N , and insulators v ₁ to v N on electrode P _L insulate electrode P 1 to each electrode Y 1 to Y _{N. L} and each electrode Y ₁ to Y _N are insulated.

In this way, each electrode X ₁ to _{X M} , Y ₁ to Y _N , the newly provided fourth electrode group P ₁ to P _L , and the third electrode group Q ₁ to Q _R
and can be considered independently because they are insulated from each other. That is, the first electrode group X ₁ to _{X M}
The second electrode group Y ₁ to Y _N is used to detect the x and y coordinates of the input position in combination with the resistors 4 and 5 as before, and the new fourth electrode group P ₁ to P _L and the third electrode Groups Q ₁ to Q _R are used to distinguish between input mode and partial erasure mode.

FIG. 6 is an explanatory diagram of the circuit in the case where an input is received from a chiyoke or the like in the embodiment of the present invention, and Q ₁ to Q _R , P ₁ to _PL are the third and fourth electrode groups, 51 is a first group electrode terminal, 52 is a second group electrode terminal, 53 is a partial erase mode detection circuit, 54 is a power supply, R is a resistor, 55 is a voltage detection circuit, 56 is an output terminal, 100 is an input position, that is, the third and the fourth electrode group are electrically in contact with each other, and 200 indicates a pressurizing range by a chiyoke or the like.

The fourth electrode group P ₁ to _PL is divided into a first group and a second group, which are connected and led to terminals 51 and 52, respectively. Furthermore, the third electrode groups Q ₁ to Q _R are commonly connected at least at one end. In addition, in FIG. 6, the first electrode group and the second electrode group, which are not directly related to the description of the embodiment, are omitted.

Now, in FIG. 6, even if the third and fourth electrode groups are electrically contacted at the input position 100 due to the input pressure, there is a gap between the fourth electrode group and the first group and the second group. No conduction occurs and no current flows through the resistor R. Therefore, no voltage appears at output terminal 56.

FIG. 7 illustrates a case where pressure input is applied when erasing a blackboard, etc. in the embodiment of the present invention.
0 to 103 indicate input positions, that is, positions where the third and fourth electrode groups are in electrical contact, and 201 indicates a pressurizing range by erasing a blackboard or the like.

The current i flowing out from the power supply 54 is connected to the terminal 51, the electrode
P ₂ , input points 101, 103 at electrodes Q ₂ and Q ₃ ,
100, 102, flows through electrode _P3 , and reaches terminal 52.
The current flows into the resistor R via . That is, the first electrode group and the second electrode group of the fourth electrode group P ₁ to _PL are brought into conduction. At this time, a voltage appears at the terminal 56 due to the current i. Therefore, depending on the presence or absence of the voltage at the output terminal 56, it is possible to automatically distinguish between an input mode using a check yoke or the like when no voltage is present, and a partial erase mode using a blackboard eraser or the like when a voltage is present.

Note that if a constant current source is used as the power source 54, the third and fourth electrode groups are in contact with each other, so that a constant value of current flows through the resistor R regardless of the level of contact resistance. Since a constant voltage is applied to the signal, subsequent signal processing becomes easier.

〔Effect of the invention〕

As explained above, it is possible to automatically identify whether the object applying pressure to the input surface is a writing instrument such as a chiyoke or a blackboard eraser. The written content is displayed on the monitor, and on the other hand, if it is pressed by a blackboard eraser, the corresponding display content can be erased (can be thought of as being written in the background color) as a partial erase 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 also the advantage that when returning, there is no need to worry about the hassle of returning the blackboard eraser to its predetermined position.

Although the above description has been made using an electronic whiteboard device as an example, the present invention is not limited to this, and can be similarly applied to electronic whiteboards and pressure-sensitive tablets in addition to electronic whiteboards. is clear.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an input section of an electronic whiteboard device according to the present invention, FIG. 2 is a configuration diagram of a conventional input section of an electronic whiteboard device, and FIG. 3 is a detailed diagram of the first parallel electrode group 2 shown in FIG. 2. FIG. 4 is a detailed diagram of a position detection circuit used in a conventional electronic whiteboard input section, FIG. 5 is an embodiment of the first parallel electrode group according to the present invention, and FIGS. 6 and 7 is an example of the present invention. 1... Insulating substrate, 2... First parallel electrode group, 3
...Flexible second parallel electrode group, 4...
First resistor, 5... Second resistor, 6, 7,
8, 9... Electrode, 10... Flexible insulating substrate, 11... Pressure sensitive rubber sheet, a, b, c, d
...terminal, W ...input surface, Y ₁ , Y ₂ ...Y _N ...1st
electrodes of _the electrode group, X ₁ , X ₂ ... X
Output terminal, 18...Y output terminal, 19...Current detection circuit, 20...Pen down output terminal, Q ₁ to Q _R
...Third electrode group, P ₁ to P _L ... Fourth electrode group, s ₁
~s _M ...Insulator, t ₁ ~t _M ...Insulator, u ₁ ~u _N ...
Insulator, v ₁ to v _N ... Insulator, 51 ... First group electrode terminal, 52 ... Second group electrode terminal, 5
3... Partial erase mode detection circuit, 54... Power supply,
R...Resistor, 55...Voltage detection circuit, 56...Output terminal, 100, 101, 102, 103...Input position, 200...Input range by chiok etc.
201... Input range due to blackboard erasure, etc.

Claims (1)

[Claims] 1. A first parallel electrode group and a second parallel electrode group arranged perpendicular to and facing the first parallel electrode group are arranged parallel to the input surface, An input position detection device that detects the position coordinates of pressure applied to an input surface by an input tool by electrical contact between a first parallel electrode group and a second parallel electrode group, the In a drawing mode identification method in an input position detection device that identifies modes corresponding to two types of input tools, a surface on which the first parallel electrode group is arranged and a surface on which the second parallel electrode group is arranged. A third parallel electrode group having one end connected in common is provided on one surface of the electrode, and a fourth parallel electrode group divided into first and second groups is provided on the other surface of the electrode, and a third parallel electrode group is provided on the other surface of the electrode. The electrode group and the fourth parallel electrode group are
The distance between adjacent electrodes in the fourth parallel electrode group, which is insulated from the first parallel electrode group and the second parallel electrode group and divided into the first and second groups, is determined by the pressure It is configured such that the width of the pressure range applied by the input device with a small area is larger than the width of the pressure range applied by the input device with the large pressure area, and the position input is performed by the input device with the large or small pressure area. The mode is identified based on whether or not the first group of electrodes and the second group of electrodes in the fourth parallel electrode group are electrically connected via the third parallel electrode group. A drawing mode identification method characterized by the following.