JPS60134928A - Input pen of input tablet - Google Patents

Abstract

PURPOSE:To prevent fall of the output even if the diameter of winding and the number of turns are made smaller than those of an air core coil, by winding a detecting coil, which is provided in the tip part of an input pen or near it, around a magnetic material pipe. CONSTITUTION:Magnetic materials are used as materials of a pipe 11 around which a detecting coil 10 in the tip part of the input pen, and the detecting coil 10 is made parallel with the surface of an input plate 16 when the axis of the pen is inclined as 30 deg. to the direction vertical to the surface of the input plate 16. When the input pen is so inclined that the center of the detecting coil 10 is always placed in the middle between conductor narrow wires 17a' and 17a'' in the plate 16, variance of a ratio of the number of magnetic fluxes penetrating the magnetic material pipe 11 of the magnetic field generated from the narrow wire 17a' to those of the magnetic field generated from the narrow wire 17a'' due to inclination of the input pen is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an input pen for an input tablet used as a terminal device when inputting characters, figures, etc. to a processing device such as a computer.

Conventional configuration and its problems Conventionally, in input tablets, multiple thin conductor wires are placed under the surface of the input plate, orthogonal to the bean, and arranged so that the orthogonal thin conductor wires are not electrically contacted. An alternating current is supplied to two parallel wires among these thin conductor wires to generate a magnetic field.

By placing the detection coil in the magnetic field generated by these two wires, an induced electromotive force is generated in the detection coil. At this time, the coordinates are the point where the induced electromotive force generated from each of the two lines is equal. Detect. If the supplied alternating current is passed through different thin conductor wires one after another, the position of the generated magnetic field on the input plate surface will be different, and if this is detected by the detection coil, the position will be continuous on the straw-filled horn plate surface. You can know the coordinates.

At this time, the coil that detects the magnetic field generated on the input plate surface is usually an air-core coil, and this air-core coil is made by winding copper wire around a bobbin vibe, etc. Located nearby. FIG. 1 shows a cross-sectional view of an example of a conventional input pen. In the figure, a pen shaft 2 is installed inside a pen case 1, and a detection coil 3 is installed at the tip of the pen case 1. The tip of pen barrel 2 is input brake 1~
7, the switch mechanism holding part 4 provided at the rear end of the pen barrel 2 turns on the switch mechanism part 5, and the detection coil 3 is connected to another circuit (not shown) by the shield \A6. (omitted), and the detection coil 3
The signal that enters the circuit is sent to this other circuit. Note that there is a thin conductor wire 8a under the surface of the input plate 7.
, 8b are arranged orthogonally in a grid pattern so that there is no electrical contact with each other, and by passing an alternating current through these conductor wires fi18a and 8b, a magnetic field is generated, which is applied to the detection coil 3 of the input pen. An induced electromotive voltage is generated.

The detection coil 3 is usually provided at the tip of a manual pen. The reason is that the voltage induced in the detection coil 3 by the magnetic field generated from the surface of the input plate 7 can be detected more efficiently. Another reason is that if the detection coil 3 is too far away from the surface of the input plate 7, there will be no difference in strength between the magnetic fields generated by the thin conductor wires 8a and 8b provided at different positions, resulting in erroneous coordinate detection. To become.

The voltage value induced in the detection coil provided at the tip of the input pen is determined by the strength of the magnetic field generated from the input plate surface, the distance between the input plate and the detection coil, and the number and diameter of the coil. In order to obtain a high induced electromotive voltage value, the magnetic field generated from the input plate surface must be strengthened, the alternating current flowing through the thin conductor wire must be increased, and the detection coil must be placed as close to the input plate surface as possible. (), it is necessary to increase the winding diameter of the coil, and increase the number of turns. However, (1) Increasing the magnetic field generated from the input plate surface is not a good measure because it increases the alternating current flowing through the thin conductor wire, increasing unnecessary radiation and power consumption generated from the input tablet.

■ Bringing the detection coil closer to the input plate surface,
Increasing the number of coil windings and increasing the diameter of the coil make the tip of the input pen thicker, which has disadvantages such as making it difficult to see the trajectory of the tip of the input pen when inputting, making it difficult to handle. .

Purpose of the Invention The present invention has an object to reduce the output even if the induced electromotive force of the detection coil provided at the tip of the input pen is made smaller in winding diameter and the number of windings than in the case of an air-core coil. The purpose is to prevent it from becoming too low.

Structure of the Invention The input pen for an input tablet according to the present invention includes a detection coil for detecting a magnetic field generated from the input plate of the input tablet at or near its tip, and a magnetic vibrator around which the detection coil is wound. It is equipped with
It is possible to secure output.

Description of examples The present invention will be explained below based on illustrated embodiments.

FIG. 2 is a sectional view showing an embodiment of the present invention together with an input plate. In the figure, a magnetic vibrator 11 made of a magnetic material with a specified shape is attached to the tip of a pen case 9.
is installed, and the detection coil 1 is attached to this magnetic pipe 11.
0 is the winding. The tip of the pen shaft 12 is the input brake 1-1
When the 6th side is pressed, the switch mechanism 14 is pressed down by the switch mechanism holding part 13, which is a
mode, and the input pen enters the operating state.

When an alternating current is passed through the thin conductor wires Ha and +7b arranged in a grid pattern inside the input horn plate 16, a magnetic field is generated from the input plate 1G surface. 1O, this is taken out as a signal and sent to an externally provided input tablet (not shown) via a shielded wire 15, and the coordinates are detected as a result.

In this embodiment, a magnetic material is used for the pipe 11 around which the detection coil 10 provided at the tip of the input pen is wound, and its shape is specified. That is, the end surface 18 of the magnetic vibrator 11 on the side facing the input plate 16 is at an angle of 30 degrees from the perpendicular direction to the Y play 1-16 plane (where the central axis of the magnetic vibrator 11, that is, the central axis of the pen). It is formed so that it is parallel to the surface of the input plate 16 when it is tilted. Also, when the central axis of the magnetic vibrator 11 is inclined at 30 degrees from the perpendicular direction to the input plate surface, the inner ridge 11' of the magnetic vibrator 11 is shortened, and the opposite side, that is, the outer ridge 11' is shortened. is being made longer. With this shape, for example, the thin conductor wire 178' shown in FIG.
When the input pen is tilted so that the center of the detection coil 10 is always located at the center of the conductor thin wire 178
It is possible to reduce the change in the ratio of the number of magnetic fluxes entering the magnetic vibrator 11 of the magnetic field generated from the thin conductor wire 17a'' and the number of magnetic fluxes entering the magnetic vibrator 11 of the magnetic field generated from the thin conductor wire 17a'' due to the tilt of the input pen. The above effect becomes larger as the tilt angle of the input pen becomes larger.In the range of small tilt angles, the effect of the shape of the magnetic vibrator is smaller than t.

Next, to explain an experimental example, Fig. 3 shows the degree of coordinate misrecognition caused by changing the inclination angle of the input pen when the shape of the magnetic vibrator 11 is changed as shown in Fig. 4. It is something that d in FIG. 4 is the outer diameter dimension of the magnetic vibrator 11, which was set to φ2.5 rum in this experimental example. Further, ρ is the length of the inner rib 11' of the magnetic vibrator 11 shown in FIG. 2, and was set to 1.5 Mn. 'Da, θb, 0c, θd
is the input plate 1 of the magnetic vibrator 11 shown in FIG.
The angles formed by the end face 19 on the side away from 6 and the inner ridge 11' are 60 degrees, 90 degrees, 135 degrees, and 150 degrees, respectively. In addition, Fig. 5 shows the degree of coordinate misrecognition when the length Q of the inner ridge 11' is changed in the magnetic vibrator 11 having the shape shown in Fig. 4(b), and the inclination angle of the input pen is set to 30 degrees. and 45 degrees.

By specifying the shape of the magnetic vibrator 11 in this manner, it is possible to reduce misidentification of coordinates by increasing the inclination angle of the input pen. The appropriate V [capacity range is inner rib 11]
'Length is 1.5#I#1 or more2. Ornm or less, the angle O between the inner ridge 11' and the end face 19 is 90 degrees or more and 135 degrees or less. If the length ρ is longer than 2 trm, the degree of misrecognition of coordinates increases, which is inconvenient;
If it is shorter than 0 m, it becomes difficult to wind the detection coil 10, which is inconvenient. Further, even if the angle θ is smaller than 90 degrees or larger than 135 degrees, the degree of misrecognition of the coordinates increases, which is disadvantageous.

Next, using the magnetic vibrator 11 having the shape shown in FIG. 4(b),
-φ2.5mz Q = LSmmzThe same induced electromotive force is obtained when ferrite is used as the magnetic material and a detection coil is wound around it, and when the detection coil is wound with an air core with a winding diameter of φ2.5mm. Comparing the number of turns of the coil for generation, the first one had 15 turns, while the latter had 40 turns. Of course, by winding it around a magnetic vibrator, it is possible to significantly reduce the number of turns of the coil.

Effects of the Invention As described above, according to the present invention, by winding the detection coil provided at or near the tip of the input pen around a magnetic vibrator, the number of turns can be significantly reduced compared to conventional air-core coils. can do.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional example of an input pen together with an input plate, Fig. 2 is a sectional view showing an embodiment of an input pen for an input tablet 1 according to the present invention together with an input plate. Figure 4 shows the relationship between the tilt angle of the input pen and the degree of coordinate misrecognition when the shape of the magnetic pipe is changed.
Figure 3 shows how the shape of the magnetic pipe changes, and Figure 5 shows the degree of coordinate misrecognition when the length of the magnetic vibrator is changed. 10...Detection coil, 11...Magnetic material vibrator, 11
′...Inner rib, 11''...Outer rib, 12...
・Pen axis agent Yoshihiro Morimoto Figure 1 17d It) 177 Figure 3 Figure 5 Door C and phrase length ÷ (mη1

Claims (1)

[Claims] 1. A detection coil for detecting a magnetic field generated from the input brake 1 of the input tablet at or near the tip;
An input pen for an input tablet, comprising a magnetic pipe around which the detection coil is wound. 2. The end face of the magnetic pipe on the side facing the input plate is formed so that it is parallel to the input plate surface when the central axis of the magnetic pipe is tilted 30 degrees from the perpendicular direction to the input plate surface. , and the central axis of the magnetic pipe is located at the input brake on the end face away from the input plate.
The angle formed between the magnetic pipe and the inner ridge when the pipe is tilted 30 degrees from the perpendicular direction to the surface is 90 degrees or more.
The input pen for an input tablet according to claim 1, wherein the input pen is formed to have an angle of 35 degrees or less. 3. The length of the inner ridge of the magnetic pipe when the central axis of the magnetic pipe is inclined at 30 degrees from the perpendicular direction to the input plate surface is 1.5 or more and 2.0 tnm or less. An input tablet 1 to an input pen according to claim 2.