JP2003157141A - Input pen with pen pressure detecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pen pressure detection and coordinate input pen, in which the area of a light load can be detected. SOLUTION: A weak extension spring which is fixed on a shield spindle integrated with a detection spindle, lightly presses a strong compression spring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tablet input pen, and more particularly to a tablet input pen having a function of sensing the pressing force of the input pen.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 7-302160 has been disclosed as a conventional pen pressure sensing stylus pen. In Japanese Patent Laid-Open No. 7-302160, the writing pressure detection shaft is always pressed and fixed by a spring.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In JP 02160, it is difficult to detect a light load region near a load of 0 g because spring pressure is applied to the detection shaft of the pen from the beginning. It is necessary to detect the writing pressure in the light load area for the authentication of the signature of the tablet input device, but it is difficult to detect, and the length of the spring varies, and the longer the spring, the larger the load at the detection start position. There was a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the related art, and a first repulsive force for compression is provided via a chuck and a shield shaft to a detection shaft that moves the pressing force of an input pen. The present invention proposes an input pen with a writing pressure detection function that detects the pressing force of the pen tip by fixing the detection shaft by providing the first spring and the second spring for pulling, which has a weak resilience.

[0005]

In the present invention, the detection shaft pressed against the tablet board surface is tightly attached to one end of the strong compression spring (first spring) 11 by the weak tension spring (second spring) 8 via the chuck and the shield shaft. Therefore, the pressing force of the detection shaft 5 can be detected in response to a light load from 0 g, and the length of the compression spring varies so that the length of the spring can be detected similarly.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The detection shaft 5 has a large diameter portion of a shield shaft 7 integrated via a chuck 6, and one end of a second spring is fixed to the end portion of the shield shaft 7. It is arranged and fixed so that the first spring is pressed and pulled in.

[0007]

The details of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic view of a main part of a capacitive coupling type coordinate input / writing pressure detection device of the present invention. Reference numeral 1 is a pen as an electrostatic coupling type coordinate input / writing pressure detection device. To input coordinates, the tip of the pen 1 is brought into contact with the surface of the tablet 2 so that the electrode wire 3 in the tablet 2 is contacted. And the conductor 5 of the coordinate detection axis of the pen 1 are electrostatically coupled, and the detected signal is processed by the signal processing unit 4 to detect the position coordinate of the pen 1.

Next, the structure of the tip portion of the pen 1 of the present invention will be described. FIG. 2 is a longitudinal sectional view of a main part of the pen 1 of the present invention. The detection shaft 5 is detachably inserted and fixed to the chuck 6 by light press-fitting. The chuck 6 is screwed onto the shield shaft 7. One end of a tension spring 8 is press-fitted into the large-diameter portion of the shield shaft 7, and the other end is connected to a supporting tool arranged at the end of the substrate 9. The tablet signal received by the detection shaft 5 of the pen 1 is transmitted to an electronic circuit (not shown) of the substrate 9 through the chuck 6, the shield shaft 7, and the tension spring 8. Actually, when a paper is placed on the tablet 2 and a signature or the like is written, even if a metal refill (ballpoint pen) 10 is set on the chuck 6, the tablet signal can be similarly detected by electrostatic coupling and transmitted to the electronic circuit of the substrate 9. .

A strong compression spring 11 which receives the writing pressure of the detection shaft 5 through the chuck 6 and the shield shaft 7 is provided in the middle diameter portion of the shield shaft 7.
Is provided. The shield shaft 7 is pulled rearward by the tensile force of the tension spring 8 having a weak elasticity, and is arranged in a state where the pressing force of the compression spring 11 and the tensile force of the tension spring 8 are suspended. The small-diameter portion at the rear end of the shield shaft 7 moves in the groove 13 of the photo interrupter 12 according to the writing pressure at the front end to change the amount of shielding transmitted light, and detects a change in current depending on the amount of light entering the light-receiving element. ing.

Now, when writing letters on the tablet 2 board,
The tip of the pen 1 is pushed and the shield shaft 7 is pushed to compress the compression spring 11 according to the writing pressure. At this time, the signal spring 8 is contracted from the stretched state, and the force for returning the detection shaft 5 is weakened. Figure 4
As shown, the composite spring characteristic diagram of the spring characteristic diagram of the compression spring 11 and the spring characteristic diagram of the tension spring 8 becomes the spring characteristic due to the writing pressure, the shield shaft 7 moves according to the writing pressure, and the signal of the photo interrupter 12 changes. A writing pressure signal is output.

As can be seen from the above description, according to the present invention, coordinate data and writing pressure data can be obtained with a simple structure in which the shield axis of the detection axis is moved in the groove of the transmissive photointerrupter.

[0012]

The detection shaft 5 of the pressure-sensitive input pen of the present invention
Since it is lightly contacted and pressed against the compression spring 11 in the middle stage of the shield shaft 7 in which is integrated, the writing pressure signal in the light load region from 0 load can be obtained.

[Brief description of drawings]

FIG. 1 Schematic diagram of coordinate input device

FIG. 2 is a sectional view of the tip of the pen of the present invention.

Figure 3: Metal refill (ballpoint pen)

[Figure 4] Distance-load characteristic diagram

[Explanation of symbols]

1 input pen 2 tablets 3 tablet patterns 4 Signal processing unit 5 detection axes 6 chuck 7 Shield axis 8 tension spring 9 substrates 10 Metal refill (ballpoint pen) 11 compression springs 12 Photointerrupter 13 groove

Claims (3)

[Claims] 1. An input pen for detecting a coordinate position on a tablet board surface, wherein a first spring contracts according to a pressing force of the detection axis of the input pen on the tablet board surface, and the first spring is a detection axis. An input pen with a pen pressure detecting function, which is fixed to the tip of a shield shaft that interlocks with the above-mentioned, and is provided with a second spring that pulls at the tip of the shield shaft that interlocks with the detection shaft so that the detection shaft contacts. . 2. The input pen with a writing pressure detecting function according to claim 1, wherein the detection shaft can be replaced by a chuck. 3. The input pen with a writing pressure detection function according to claim 1, wherein the initial value of the first spring and the initial value of the second spring are substantially the same in opposite directions.