JP2002323953A - Coordinate input pen with pressure sensing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the pen pressure detection durability of a pen pressure detection and coordinate input pen. SOLUTION: The axial movement of a detecting rod by a pressure is received by a metal spring and a light reflection board in the rear part of the detecting rod is arranged while facing a reflective photointerrupter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input pen for a coordinate tablet, and more particularly to a coordinate input pen having a pressure-sensitive function for detecting writing pressure.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent No. 2717774 is known as a pressure sensing stylus pen. In Japanese Patent No. 2717774, a pressure-sensitive conductive rubber is used as a writing pressure detecting element, and a change in the resistance value of the pressure-sensitive conductive rubber is sensed by receiving a pen pressing force together with a spring.

[0003]

However, in the above-mentioned prior art, since the pressure-sensitive conductive rubber is used for detecting the pen pressure, if a strong impact force is applied to the pen tip or if the pen tip is used repeatedly for a long period of time. Problems such as rubber deformation and deterioration are conceivable.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the conventional problems, and has been described in which a pressing force of a coordinate input pen is received by a metal spring, and a light fixed to a rear portion of a detection shaft by a pressing force applied to the pen tip. By continuously changing the analog output current of the reflection type photo interrupter according to the movement distance of the reflection plate,
The present invention proposes a coordinate input pen with a pressure-sensitive function that also detects writing pressure.

[0005]

According to the present invention, the light reflecting plate at the rear of the detection axis is placed in front of the reflection type photointerrupter and is simply moved in the axial direction by pressing, so that the writing pressure can be detected without contact between the detection axis and the detection section.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A metal spring receives an axial movement of a coordinate input pen such as a capacitive coupling type, an electromagnetic type, a light beam type, an oscillating wave type, and a two-layer resistive film contact type due to a pen pressure of a detection axis.
The light reflector at the rear of the detection axis is arranged in front of the reflective photointerrupter.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a configuration diagram of a main portion of a capacitively coupled coordinate detection and writing pressure detection device according to an example of the present invention. Reference numeral 1 denotes a coordinate input (coordinate designation) used in the coordinate detection and writing pressure detection device.
It is a pen. In order to input coordinates, the tip of the pen 1 is brought into contact with the tablet 2
Each of the electrode lines in the tablet and the portion of the conductor 10 of the coordinate detection axis of the pen 1 protruding from the pen case (shield) are capacitively coupled, and the electric signal transmitted from each of the electrode lines in the tablet 2 is processed by the signal processing unit 3. By doing so, the coordinates of the tip of the pen 1 on the surface of the tablet 2 are detected. For details of coordinate detection, refer to each document.

Next, the structure of the front part (tip side) of the pen 1 of the present invention will be described. FIG. 2 is a sectional view of a main part of the pen 1 of the present invention. A metal spring 11 for connecting a signal to the rear substrate 12 is closely attached to the detection shaft 10 and slightly urges a main metal spring 13 which receives an axial writing pressure in a compression direction. At the rear of the detection shaft 10, a reflection plate 14 for reflecting light of a reflection type photo interrupter 15 is fixed.

Now, when the tip of the pen 1 abuts on the board surface of the tablet 2, the main metal spring 13 is compressed as the tip of the pen 1 is relatively pressed, and the light reflecting plate 14 at the rear of the detection shaft 10 moves. I do. When the distance between the surface of the reflection type photo-interrupter 15 and the light reflection plate 14 approaches, the output current of the reflection type photo-interrupter 15 changes as shown in FIG. (See the graph in Fig. 3)

When the tip of the pen 1 is pressed, the detection shaft 10 compresses the main metal spring 13, and the relationship between the compression movement distance and the pen tip load is shown in FIG. Therefore, writing pressure is pen 1
At the tip, the analog output current of the reflective photointerrupter 15 changes continuously, and the signal processing unit 3 converts the analog output current into pen pressure data and outputs it.

As can be seen from the above description, the present invention has a simple structure in which the rear light reflecting plate 14 of the detection shaft 10 is opposed to the reflective photointerrupter 15 and is simply moved.
Writing pressure data is obtained together with the coordinate detection. Further, the metal spring may be not only a coil spring but also a plate spring (including a linear spring). Further, the example of the capacitively coupled coordinate detection has been described, but the coordinate detection as described in [Embodiment of the invention] may be used.

[0012]

The coordinate input pen with a pressure-sensitive function of the present invention has excellent durability because it has a simple structure and the writing pressure detecting section can detect writing pressing (contact pressing) without contact.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of a capacitively coupled coordinate detection device.

FIG. 2 is a sectional view of a main part of the present invention.

FIG. 3 is a diagram illustrating a relationship between a moving distance of a light reflecting plate and an output current of a reflective photointerrupter.

[Figure 4] Moving distance of light reflecting plate vs. pen tip load characteristic diagram

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input pen 2 Tablet (coordinate board) 3 Signal processing part 10 Detection axis 11 Signal spring 12 Substrate 13 Writing pressure spring (metal spring) 14 Light reflection plate 15 Reflection type photo interrupter

Claims (1)

[Claims] 1. An input pen for detecting coordinates on a tablet board surface, wherein a means for detecting a writing pressure of the input pen includes a writing shaft of a detection axis of the input pen held at a steady position by a metal spring. A coordinate input pen with a pressure-sensitive function characterized by continuously changing the analog output current of a reflective photointerrupter by axial movement by pressing.