JPS6117472Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention is applicable to a handwriting input device, especially a handwriting input device that detects the coordinate position of an input character or figure by pressing an input pen into contact with an input surface made of two resistive sheets facing each other.
The present invention relates to a handwriting input device that accurately captures input information and always displays correct detection and display. This type of handwriting input device is called a data tablet, digitizer, or the like, and has been widely put into practical use as a computer terminal device, a handwritten character/graphic communication terminal device, and the like. For example, two resistance sheets are placed facing each other via a spacer, etc., characters or figures are input by pressing the resistance sheets with a ballpoint pen or fingertip, and the coordinate position of the pressed contact point is retrieved using electrical signals. A configuration in which the information is displayed on an external display unit such as a cathode ray tube or an XY recorder is common. FIG. 1 shows an example of a handwritten character/figure input device configured as described above.
2 is an input panel, 2 is an input pen, 3 is an interface, 4 is a computer, and 5 is a cathode ray tube of an external display device. The input panel 1 consists of two resistive sheets 6 and 7, each made of a thin insulating sheet such as a polyester film, with a resistive film such as indium oxide uniformly coated on one side, as shown in FIG.
Dot-shaped insulating spacers 8 distributed between 7
parallel current collecting electrodes 9a, 9b, 10a, 10b such as silver paste are adhered to both ends of both resistance sheets 6, 7, respectively, and these current collecting electrodes are arranged perpendicularly to each other in the X direction and the Y direction. The input panel 1 having such a configuration has an electrode 9 on one of the resistor sheets 6 (or 7).
a, 9b (or 10a, 10b) and press the input pen 2 on the panel 1, the coordinate position Y (or X) of the pressed contact point P will be displayed.
is the electrode 10a of the other resistance sheet 7 (or 6),
10b (or 9a, 9b) is detected as an electric signal as the voltage division ratio of the resistor. Therefore, by controlling the power supply connection and the detection of electric signals by the computer 4 using a switch circuit (not shown) provided in the interface 3, the detection signals of the input point P and the X, Y coordinates can be connected to the interface. The signal is output between the output terminals 3 and 3. Therefore, when the input pen 2 is lightly pressed against the input surface of the input panel 1 and a desired character or figure is drawn, that character or figure is retrieved using an X coordinate signal and a Y coordinate signal.
It is sent to computer 4. The computer 4 processes signals according to a pre-installed program,
The input characters and figures are projected onto the cathode ray tube 5. By the way, when inputting characters or figures by pressing the resistance sheet 6 with the input pen 2, it is unnecessary to use something other than the input pen 2, for example, because the operator places his hand on the panel surface when operating the input pen 2. In some cases, an incorrect signal was input due to excessive pressure, or the input was not input due to insufficient contact even though the input was in the opposite direction. Particularly in the case of an input panel 1 with a wide operation surface, it is difficult to sandwich the flexible resistance sheet 6 over the entire panel surface and arrange it evenly in the gaps. As shown in FIG. 2, a large number of dot-shaped insulating spacers 8 are distributed and arranged between the resistive sheets 6 and 7. As shown in FIG. Therefore, when the input pen 2 is positioned on the spacer 8, a detection signal of the coordinate position cannot be obtained, and some of the input characters or figures may partially fall off and be projected onto the cathode ray tube 5. There was a problem. The present invention was proposed in view of the above points, and it eliminates input signals other than the input pen, and also senses and detects when the input pen rides on the insulating spacer, ensuring accurate detection at all times. A handwriting input device is provided that displays handwriting. The handwriting input device according to the present invention uses an input pen that switches by sensing the pen pressure, and uses a pen pressure detection signal (hereinafter referred to as a pen signal) from the input pen and a coordinate detection signal from the input panel. The device is characterized in that the display device is controlled by the AND signal of Detection errors and output errors are improved. Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 3 shows an example of the configuration of a handwriting input device according to the present invention, where 1 is an input panel, 3 is an interface, 4 is a computer, 5 is a cathode ray tube of an external display device, and 11 is an internal pen pressure sensor. The input pen has a pen pressure detection switch 12 that operates as a pen pressure sensor, and is connected to a computer 4 via an interface 13. Here, the same symbols as in FIG. 1 represent the same functional parts, and their explanation will be omitted for the sake of simplicity. Pen pressure detection switch 12 built into the input pen 11
For example, using a known ballpoint pen or sharpening pen, etc., in which the lead of a ballpoint pen or sharpening pen is held in a pen holder by a spring means or the like, and the pressing force of the tip of the lead is applied to the spring means, the spring means to which this writing pressure is applied is used. The switch 12 is opened and closed by pressing the input pen 11 onto the panel 1 by attaching a suitable switch means, for example, an electrode plate holding pressure-sensitive rubber. Similarly to the conventional handwriting input device, when the input pen 11 is lightly pressed against the input surface of the input panel 1 and a desired character or figure is drawn, the character or figure is detected by the coordinates of the X and Y coordinates. The signal is taken out to the computer 4 as a signal. In this case, the pen signal detected by the pen pressure detection switch 12 of the input pen 11 is input to the computer 14 via the interface 13, and the computer 4 uses the pen signal of the input pen to perform the following, for example, as shown in FIG. The coordinate detection signal is processed by the program, and the input characters and figures are projected onto the cathode ray tube 5. That is, the computer 4 first checks whether or not the pen pressure of the switch 12 of the input pen 11 is detected;
If there is no pen signal from the input pen 11, the system waits for detection of the pen pressure of the switch 12 of the input pen again. This prevents the output from being output to the external display even if the user accidentally presses the button with a fingertip or the like with a device other than the input pen. Next, when a pen signal is input, it is checked whether there is an input on the input panel 1, that is, whether the input panel 1 is pressed and both resistance sheets are in contact with each other. 1), the X and Y coordinates of the input point are detected, the presence of a pen signal from the input pen 11 is confirmed again, and the pen signal is output to the cathode ray tube 5 for display. Next, when a pen signal from the input pen 11 is input and there is no input from the input panel 1 (that is, when there is no panel signal even though the input pen 11 is pressing the input surface of the input panel 1), , normally indicates a state in which the input pen 11 has landed on the dot-shaped insulating spacer 8 between both resistance sheets 6 and 7 of the input panel 1). If it is within the set time, the previous or next

[Table] As described above, the handwriting input device according to the present invention has a built-in writing pressure detection switch operated by writing pressure in the input pen, and the writing pressure detection signal of the input pen and the coordinate detection signal of the input panel are connected. Since the display device is controlled by the AND signal, it is possible to prevent the output of signals input by mistake using a device other than the input pen, and to prevent detection signals that should naturally be input from falling off due to the insulating spacer between the two resistor sheets on the input panel. It is possible to provide a coordinate input device that processes input information accurately and has excellent detection and display. In the above embodiment, the pen pressure detection switch 12 built into the input pen 11 was connected to the main body of the device with a cord, but it is also possible to easily make it cordless by incorporating an oscillator for ultrasonic waves, radio waves, etc. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional handwritten character graphic display device, FIG. 2 is an exploded perspective view of an input panel with parts used in FIG. 1, and FIG. 3 is a block diagram of a handwritten character graphic display device of the present invention. FIG. 4 is a program flow of the computer shown in FIG. 5... External display device (cathode ray tube), 6, 7...
...Resistance sheet, 11... Input pen, 12... Pen pressure detection switch.

Claims (1)

[Claims for Utility Model Registration] In a handwriting input device that presses an input pen against an input panel in which two resistance sheets are arranged facing each other, and outputs a coordinate detection signal of a pressed contact point, the input pen is configured to detect pen pressure. Install the switch and
A handwriting input device characterized in that a display device is controlled by an AND signal of a writing pressure detection signal of an input pen and a panel signal for detecting a contact state of the two resistance sheets.