JPS62165234A - Writing tool for inputting electronic blackboard - Google Patents

Abstract

PURPOSE:To identify an electric signal by a frequency level by providing an oscillator, which is directed to the peripheral part of the tip of a penpoint and oscillates high frequency oscillating waves having a natural frequency, in the peripheral part surrounding the penpoint of a holder body and connecting the oscillator to an oscillating circuit. CONSTITUTION:A holder body 15 is formed into a narrow and long cylinder, and a penpoint 16 such as a felt pen, an oscillating circuit 17, and a cell 18 like a dry cell are stored in the holder body 15. Detecting circuits 33 are attached to both ends of a high polymer piezoelectric sheet 1 to calculate potentials VL and VR generated in the left and the right. In this case, the + terminal of an operational amplifier (O.P) is grounded similarly to a metallic film 4. When a distortion occurrence point of a resistance value 3 is defined as a variable (x), coordinates (x) of the distortion occurrence point at a time t = t0 are obtained in accordance with VR(to) and VL(to), and the difference between respective signals of counter electrodes 5x and 5x is divided by the sum value to obtain coordinates (x) as displacement from the center point of a resistance film 3, and a writing tool 14 is displayed as coordinates of the writing position, and a coordinate signal having the same motion as the form of a character on an electronic blackboard 7 is taken out simultaneously. Thus, simultaneous display of many points and color display are accurately and easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a writing tool for inputting electronic blackboards, which can simultaneously write on an electronic blackboard and provide the written characters, color, type, etc. as electrical signals.

(Prior art) One system that has recently been put into practical use is a video conferencing system that uses telephone lines, but in addition to a television imaging device and image receiving device, there are other things that are indispensable for meetings with a large number of people. It is said to be an electronic blackboard.

In other words, it is necessary that the words, pictures, etc. drawn on the blackboard be recognized not only by a large number of participants in the same location, but also by participants in remote ceremony halls at the same time. However, combining an ordinary blackboard with a television has some inconveniences, such as creating a blind spot for the person standing in front of the blackboard and making it difficult to read. This is why an electronic blackboard that can transmit this information is needed.

From this point of view, examples of electronic blackboards suitable for use in color drawing conference systems have recently been provided, and since 1930,
The outline was published in the Nikkan Kogyo Shimbun newspaper published on Friday, March 16, 1999.

This blackboard is an enlarged version of the sketchphone drawing pad that has already been developed, and has a structure in which parallel electrode sheets (one per 2 yttytt) are stacked so that the electrodes are perpendicular to each other, and a pressure-sensitive rubber sheet is sandwiched between them. The pressure applied to the drawing is detected and converted into an electrical signal using the X and Y coordinate axes, which are perpendicular to the electrodes.

Felt-tip pens are mainly used as writing tools.

(Problem to be Solved by the Invention) However, as shown schematically in Figure 12 (A), when the conventional blackboard (■) applies pressure to other parts, such as by placing a hand on it and writing while pressing it, two-point contact occurs. Since the electrical signal converter recognizes the position using the center of gravity of the contact point as the contact point, there is a problem of malfunction.

Furthermore, when two or more people write on the blackboard (b) at the same time as shown in FIG. 12 (b), the center of gravity of a multi-point contact will be incorrectly determined to be a contact point.

On the other hand, even if you try to display multiple colors, this electronic blackboard only has a position recognition function based on pressure sensitivity, so
As shown in Figure 3, this is done by the activation of the color recognition switch C (a) installed directly under the hole of the felt-tip pen holder 31). For example, when a black pen (16B) is pulled out, the corresponding recognition is performed. By opening the switch,
Assuming that a black felt-tip pen (AS, 3) is used, the color recognition circuit of the electronic blackboard will electronically transmit a black sign.

However, with this method, unless the felt-tip pen is inserted correctly into the hole in the designated felt-tip pen holder 9, it is obvious that the color will be misunderstood. There are many practical problems, such as not being allowed to leave it out.

In view of these various problems, the present invention has been made, and it provides a writing tool such as a felt-tip pen with a function of emitting a word corresponding to the color or type of writing tool. By combining this signal with a distinguishable electronic blackboard, characters written at the same time can be recognized separately, and
By making it easy to display information by color, various information written on an electronic blackboard can be accurately transmitted; writing and drawing can be performed at the same time, making it suitable for a wide range of applications such as color drawing and presentation conference systems. It is an attempt to make it suitable.

(Means for Solving the Problems) As is clear from the drawings showing the embodiments, the present invention provides a sheet ( 2) is an electronic blackboard (7) to which is attached a high-frequency vibration at the same time as writing. The oscillation circuit αη
A brush tip (16) such as a felt pen tip is inserted in a replaceable manner into the tip of the holder main body α9 containing a built-in battery (to), and the brush tip U is inserted into the surrounding area surrounding the brush tip (16) in the holder main body α9 A vibrator Qυ capable of oscillating a high-frequency vibration wave of a natural frequency is provided around the tip of the →, and the vibrator Qυ is connected to the oscillation circuit αη.

(Function) The writing instrument of the present invention has a military function and a unique high frequency vibration wave oscillation (support).
By using it in combination with a piezoelectric electronic blackboard, electrical signals at positions corresponding to military science can be identified by the signal level caused by vibration distortion. Electrical signals corresponding to colors and types of writing instruments can be identified by frequency levels.

Therefore, it is suitable as a writing instrument for inputting information on an electronic blackboard, as long as it can be handled in the same way as a normal felt-tip pen.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

Figures 1 to 3 show aspects of the writing instrument αQ according to an example of the present invention, and the holder main body αQ, which has a cap screwed onto the rear barrel opening, has an elongated round cylinder shape. The inside of the cylinder has a tip part facing the front barrel opening as a brush tip insertion part, a central part as an oscillation circuit housing part, and a rear part facing the rear barrel opening as a battery housing part, and each part has a brush tip αQ, for example, felt. A pen, an oscillation circuit, and a battery α group, such as a dry cell battery, are housed respectively.The felt pen αQ is housed with the tip protruding forward so that it can be replaced, while the dry battery side is housed with a cap fi.
It is stored so that it can be taken out and put in by removing the l.

A ring-shaped transducer, e.g., an ultrasonic transducer, is housed in a donut-shaped space formed by surrounding the brush tip insertion part at the tip of the holder body aυ, and is placed at an appropriate position on the side wall of the holder main body α, e.g. Holder body α9 with your fingertips
A high-frequency oscillation device is constituted by a pen operation switch (A) provided at a position where the thumb or index finger touches when gripping the pen, the Q force of the oscillation circuit, the dry cloth throat, and the vibrator (21). While the pen operation switch (A) is turned on, the vibrator ■η vibrates and the felt pen α→
It has a cylindrical shape that is directed around the tip of the pen OQ and surrounds the pen OQ, and allows high-frequency vibration waves to be propagated through the air.

The structure of an example of the oscillator 2υ is shown in an enlarged scale in Figure 3.
It has a structure in which a washer-type polymeric piezoelectric film 4 is supported by a piezoelectric film support @ at both its inner and outer peripheral edges, and a protective net (c) is stretched in front of the film 123. It is possible to apply a high frequency output from the oscillation circuit aη to the polymer piezoelectric film (c) and cause it to vibrate.

The writing instrument α→, which has the structure described above, is held with fingers, and at the same time as this poem is written, the pen operation switch (A) is turned on, and the felt-tip pen αQ is used to write the electronic blackboard (7) (which will be described later). When writing on the oscillator υ, the vibration waves from the vibrator υ form a ring shape around the tip of the pen αQ and are transmitted through the air to the surface of the electronic blackboard, causing a sheet of polymer piezoelectric material in this area to form a ring shape around the tip of the pen αQ. (2) is locally vibrated in a donut shape.

In addition, the felt pen (lfl color is, for example, cap Q9)
It is desirable for handling purposes to determine the color in advance so that the color is the same as the color displayed on the screen, thereby eliminating the possibility of issuing a signal of a wrong color.

Furthermore, for multiple brushes of different colors, by making it possible to oscillate different ultrasonic waves that are unique to each brush and whose frequencies are slightly shifted between each other, color signals can be detected by identifying the frequencies. It is possible to produce Note that the brush tip αQ may be made of chalk.

The structure of the electronic blackboard (7) on which letters and pictures are written using the brush α-X and the sign processing circuit will be briefly explained with reference to the drawings from FIG. 4 onwards.

Electronic blackboard (7) uses polymer piezoelectric sheet (1) as substrate (6)
It is attached directly or via a rubber sheet to the surface, and if necessary, a colored protective film is laminated on the surface to form a rectangular plate of an appropriate size, for example, by keeping the surface white. There is.

A polymeric piezoelectric sheet (1) is sandwiched between a sheet (2) made of a polymeric piezoelectric material such as polyvinylidene fluoride (PVDF) and coated on both sides with a resistive thin film (hereinafter referred to as a resistance film) (3) made of a carbon-containing polymer, for example. Films and metal thin films (
(hereinafter referred to as metal film) (4) For example, it is a laminate formed by adhering aluminum foil to each other, and the sheet (2) is further polarized by applying a DC high voltage between both surfaces. Therefore, the sheet (2) made of the polymeric piezoelectric material becomes piezoelectric by the polarization treatment.

In addition to PVDF, any polymeric material that exhibits piezoelectricity can be used as the polymeric piezoelectric material.On the other hand, the resistive film (3) can be made thin by uniformly dispersing carbon particles in a fluororesin. Examples include those finished into sheets.

The polymer piezoelectric sheet (1) configured in this way is a resistive film (3).
Strip-shaped electrodes (5x), (5x) are disposed on both ends of the resistor film (3) in the X direction (horizontal direction in Fig. 4) in close conductive contact with the resistive film (3) by means such as aluminum vapor deposition. At the same time, electrodes (5y) and (5y) having the same structure as the electrodes (5X) and (5X) are arranged on both end sides in the y direction (vertical direction in FIG. 4) orthogonal to the X direction.

The above electrodes (5x), (5x) and electrodes (5Y), (5Y
), it goes without saying that they should be separated from the electrodes (5x), (5x), (5y), <
5'f), connect the X coordinate detection line (8) to the conductors (A't), (62), and connect the conductors (13), ( 14), the y-coordinate detection line (9) is read directly, but both lines (8).

Since (9) has the same structure, the following is the X coordinate detection line (8)
I will explain about it.

A current/injection pressure converter (IOX) is connected to the end of each conductor (gl),'(#2), respectively, and a plurality of frequency discrimination circuits m, m, tm' are connected to each of their output terminals. ... are branched and connected, and adders (IIX), (IIX), (IIX),
... and subtractor (12X), (12x'), (12x
')... are connected in parallel, and an adder (I
IX), (IIX), (IIX) -... output terminal and subtractor (12X), (12X), (12X)
The output terminal of ... is a divider (13X), (lax),
(18
The frequency discriminator circuit outputs only the electric signal in the frequency band as a P wave, and outputs a frequency (fO) that is different from the frequency (fO).
fo) as the cutoff center frequency, the frequency discrimination circuit (a) outputs only the electrical signal of the second frequency band adjacent to the first frequency band as a P wave, and sequentially cuts (fo) in the same way. The frequency discrimination circuit 1211 is configured to output only the electrical signal of the third frequency band adjacent to the second frequency band as a P wave as the off center frequency.

Therefore, the X coordinate detection line (8) transmits the voltage training signal of the current/voltage converter (1ox), (tax) to the frequency discriminator circuit (1), one (a) of (a) is the first When it is determined that the signal has a frequency that belongs to the frequency band,
Subtract with the subtracter (12X) and add this value to the adder (OX)
A divider (lax
), it performs a series of calculations such as dividing by .) and outputs the calculation result value.

These addition, subtraction, and division operations can be realized using analog circuits, but for example, x N, '1 (5X), (5X
) may be converted into a voltage signal, and the signal after being differentiated by frequency may be converted into digital signals by an A/D converter, which may be input into a microcomputer and processed by software.

Note that the metal film (4) is for grounding.

Next, in the electronic blackboard (7), when the rectangular polymer piezoelectric sheet (1) vibrates in the thickness direction due to local high-frequency vibration (see Fig. 8), the resistive film ( 3) The principle of detecting the above x and y positions is as follows.

First, since the procedure is the same for the y-axis and the y-axis, we will consider the one-dimensional direction in the X-axis direction.

As shown in Figure 8, when a piezoelectric material is subjected to high-frequency vibration and strain in the thickness direction due to the vibration is applied, polarization occurs and the terminal (a)
, (b).

Figure 9 shows the voltage generated between terminals (a) and (b) on the vertical axis and time on the horizontal axis.As is clear from this diagram, the situation shown in Figure 8 is electrically When replaced with an equivalent circuit, it becomes as shown in FIG.

In other words, the part where vibrational strain occurs has a charge (Qo
) is represented by a capacitor.

Since the resistance of the resistive film (3) is uniformly distributed over the rectangular surface, the resistance value on the right side of the strain generation point (in Figure 8) is expressed as R1, and the resistive liquid on the left side is expressed as RL. .

Now, as shown in Fig. 7, detecting circuits (to) are attached to both ends of the polymer piezoelectric sheet (1), and the
Calculate L, VR.

In this case, the e terminal of the operational amplifier (0, P) is connected to the metal film (4
) and ground in the same way.

If the strain generation point of resistance value (3) is the variable X, then RL,
RR is equivalently expressed as a slide resistance as shown in FIG.

ItL-RR= 2XRo... (c) Here 2Ro=
RL + RR... From (c), 2 RORL + RR (a), substituting equation (0) into equation (i), from equation (e), the coordinates (X) of the strain generation point at a certain time 1 =: 1o is V (to), and vL (to) is more desirable.

In other words, equation (E) calculates the X coordinate ( (X coordinate) is obtained as the displacement from the center point of the resistive film (3).

As is clear from the above explanation, a writing instrument 04) having directional oscillation is brought into contact with a 9-child blackboard (7) whose elements are a polymeric piezoelectric sheet (1), and characters or pictures are shaped. As you move the electronic blackboard (7) in any way, vibration distortion will occur in a pattern corresponding to the letters or pictures, so the point where this distortion occurs is continuously converted into a kōki shield symbol with both x and y coordinates. However, at the same time, it is possible to distinguish the oscillation frequency, transmit it, and record it as a warning.

In this case, by making the plurality of writing instruments used oscillate at different frequencies, it is possible to distinguish the writing instrument α0■ signal during simultaneous multi-point writing, and also to The signals can be extracted separately for each color, and can also be marked @.

Note that distortion occurs with respect to the writing point (the same place is the surrounding ring-shaped area, but it is convenient: the signal to be extracted is the point that is the center of gravity of the ring-shaped area, that is, the writing instrument Q4) will be displayed as the coordinates of the location you wrote down,
Coordinate signals with the same movement as the font on the electronic blackboard (7) are extracted at the same time.

(Effects of the Invention) The effects of the present invention that achieve the above-mentioned grooves, formations, and actions are listed below.

(1) The writing instrument of the present invention has a writing tip uQ and a writing tip O.
Since it is equipped with a vibrator (2!η) that can oscillate a high-frequency vibration wave with a natural frequency by directing it around the tip of the Q, it vibrates against the electronic blackboard (7) to notify the position of the writing point while writing. It can be applied in a distorted state, allowing a display device to display the same pattern of letters and pictures at the same time.

(2) By giving each writing instrument a unique vibration frequency, it is possible to specify the type and color of the writing instrument on the electronic blackboard (7) depending on the vibration frequency, and it is possible to use multiple points at the same time. Display and color display can be performed accurately and easily.

(3) Since the writing implement of the present invention can be handled in the same manner as conventional felt-tip pens, there are no troublesome restrictions in practical use and it is extremely convenient.

[Brief Description of the Drawings] Figures 1 to 3 are a front view and a bottom view of an example of the present invention, an enlarged 'VFfrm view of the part surrounded by a small circle in Figure 1, and Figure 4.
The figure is a developed view showing the structure of an electronic blackboard used in combination with the example of the present invention, FIGS. 8 to 11 are explanatory diagrams showing the principle of the position detection performance of the electronic black comparison, and FIGS. 12 (a), (b) and Figure 13 is a schematic explanatory diagram of a conventional electronic blackboard.・
・Brush tip, αη...oscillation circuit, α...Takaike, H...oscillator. Figure 1 Figure 2 Figure 5 Figure 7 Figure 8 Figure 10 Figure 11

Claims (1)

[Claims] 1. Electronic blackboard input that causes high-frequency vibrations to be generated at the same time as writing on an electronic blackboard (7) to which is attached a sheet (2) made of a polymeric piezoelectric material having piezoelectric properties that can convert high-frequency vibrations into electrical signals when applied. It is a writing instrument with an oscillation circuit (1
7) and a holder body (15) containing a battery (18)
A brush tip (16) such as a felt pen tip is inserted in a replaceable manner into the tip of the holder body (15).
) is provided with a vibrator (21) capable of oscillating a high-frequency vibration wave of a natural frequency by directing it around the tip of the brush tip (16), and the vibrator (21) is connected to the oscillation circuit. (17) A writing utensil for inputting information on an electronic blackboard, characterized in that it is connected to.