JPH06301483A - Line drawing system/device using pen input - Google Patents

Abstract

PURPOSE:To improve the line drawing operability of a pen computer which contains a pen, a tablet, a liquid crystal display, etc. CONSTITUTION:A pen 202 of a pen computer is provided with a frequency converting part 203. Then processor 201 is provided with a display part 204, a tablet 205, a drawing pressure deciding part 206. Furthermore a line drawing soft 207 which works in the processor 201 is provided with line drawing part 208, a line width fixing storage flag 209, and a line width storage means 210. In such a constitution, the width of the line shown at the park 204 is varied by changing the drawing pressure of the pen 202. Thus the line width is variable just by changing the drawing pressure when the line is drawn by the pen 202. As a result, a new line width changing function is acquired and at the same time the selection of a line width menu, etc., can be omitted. Then the line drawing operability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen drawing function in a display device such as a tablet, a pen and a liquid crystal display.

[0002]

2. Description of the Related Art In a conventional pen computer using a tablet, a pen, a liquid crystal display and the like, the mechanism for determining whether or not the pen has been pressed is only a mechanism such as a button, that is, there are only two values of ON / OFF. It was not continuously variable.

For this reason, line drawing has been performed with or without lines.

In addition, even if it has a mechanism for changing the line width,
It was drawn after selecting the line width in the line width selection menu.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the operability of line drawing in a pen drawing function in a display device such as a tablet, a pen and a liquid crystal display.

[0006] In the past, whether or not the line is simply present / absent,
Or it was necessary to change the line width by menu selection.

In the present invention, the line width drawn by the drawing software is automatically changed (thick line, middle line, thin line, etc.) based on the writing pressure information received from the pen and tablet. Since it can be freely changed and there is no need for menu operation, there is no interruption of operation and the operability of line drawing is significantly improved.

[0008]

In order to achieve the above object, means for detecting writing pressure on the pen side, means for changing the frequency of an electromagnetic wave transmitted to the tablet by the writing pressure, and writing pressure information on the tablet are shown. Means for sending electromagnetic waves, means for detecting the position of the pen on the tablet side, means for receiving the electromagnetic waves from the pen and converting them into AC waves, means for converting the received AC waves into square waves (comparator) waveform shaping, square waves Means for converting the frequency of the signal into a voltage (F / V converter), means for converting the input voltage into a digital value (A / D converter), and a digital value with a CPU (Central).
Peripheral device interface adapter (PIA: Peripher) to be input to Processor Unit)
Al interface adapter), a means for drawing a line on the drawing software side, a means for detecting pen pressure and acquiring writing pressure information, and a writing pressure information storage means.

[0009]

The means for detecting the pen pressure on the pen side sends the pen pressure information to the means for changing the frequency of the electromagnetic wave based on the pen pressure when the pen is pressed against the tablet. The means for changing the frequency of the electromagnetic wave continuously changes the frequency based on the information. The means for sending the electromagnetic wave sends the electromagnetic wave toward the tablet. The means for detecting the pen position of the tablet detects the pen position, and at the same time, the means for converting an electromagnetic wave into an AC wave converts it into an AC wave. A means (comparator) for converting an AC wave into a square wave converts the AC wave into a square wave with a predetermined voltage as a boundary and shapes the waveform. The means for converting the frequency of the square wave into a voltage (F / V converter) sends the output voltage corresponding to the input frequency to the means (A / D converter) for converting the input voltage into a digital value. Means to convert input voltage to digital value (A / D converter)
In response to an instruction from the peripheral device interface adapter (PIA), the input voltage is A / D converted and sent to the PIA. The peripheral device interface adapter (PIA) holds the digital value of the input voltage and can refer to it from the CPU.
The drawing software detects that the pen has been pressed, the means for acquiring the pen pressure information acquires the pen pressure information from the PIA, and sends it to the means for drawing a line. The means for drawing a line determines the line width based on the information, and when the pen moves, draws a line on the display device with the line width.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 shows an embodiment of a processing apparatus for operating the present invention. Reference numeral 101 is a processing device, 102 is a display device and a tablet, and 103 is a pen input device. FIG. 2 is an example of a processing device for explaining the configuration of an embodiment of the present invention.
201 is a processing device, and 202 is a pen. On the processing device, the tablet (205) operates so as to receive electromagnetic waves from the pen. Also, the line drawing software (207) is operating. The pen (202) is a tablet (205)
When pushed by, the frequency changing unit (20) of the pen (202)
3) changes the frequency of the electromagnetic wave transmitted, and the writing pressure determination unit (206) determines the writing pressure value based on the frequency. The line drawing unit (208) receives the data from the writing pressure determination unit (206) and stores it in the line width storage means (210). At the same time, it is detected whether or not the button (211) is pressed and stored in the fixed line width storage flag (209). FIG. 3 is an example (first example) of a pen configuration diagram of an embodiment of the present invention. The pen comprises a variable frequency oscillator circuit (301) and a transmitter coil (302). The outer shape of the pen consists of the main body (303) and the nib (304), and when the nib is pressed, the iron core (306) causes the coil (3) to move.
05), which changes the impedance of the coil (305). This coil (305) is RL
The C resonance circuit is configured, and the resonance frequency fluctuates as the impedance changes. The alternating current of this resonance frequency of the transmitting circuit passes through the transformer and the transmitting coil (30
7), and the electromagnetic waves are transmitted to the tablet by the transmission coil (307). FIG. 3 is an example (second example) of a pen configuration diagram of an embodiment of the present invention. Pen shape is the main body (401)
When the pen tip is pressed, the resistance value of the variable resistor (403) changes, which changes the impedance of the circuit and changes the frequency of the oscillation circuit. The alternating current of the transmitting circuit is sent to the transmitting coil (404) via the transformer, and electromagnetic waves are transmitted from the transmitting coil (404) to the tablet. FIG. 5 is a block diagram of the tablet unit according to the embodiment of the present invention. The receiving circuit (501) of the tablet converts the electromagnetic wave into a current and sends it to the voltage comparator (502). The voltage comparator (502) converts the input alternating current having a frequency into a square wave. After that, the waveform shaping circuit (503) shapes the waveform of the square wave, and the frequency-
Send to voltage converter (FVC) (504). The frequency-voltage converter (504) outputs a voltage proportional to the frequency of the input square wave. The A / D converter (505)
The input voltage input from the frequency-voltage converter (504) is converted from an analog value to an 8-bit digital value. A / D conversion of the A / D converter (505) is PIA
It is performed by an instruction from (506). PIA (50
6) sends a conversion command to the A / D converter (505), waits for a conversion end response, holds the A / D converted digital value after receiving the response, and makes it readable by the CPU. FIG. 6 is a simple circuit diagram of the tablet unit according to the embodiment of the present invention. FIG. 7 is a flowchart showing the processing procedure of the embodiment of the present invention. When the process is STARTed (701), the PIA is initially set (702). After initial setting, an infinite loop is entered (703). In the loop, determine whether the pen is pressed on the tablet (70
6) If it is pressed, the fixed flag (209) is checked (705). The fixed flag (209) is a flag for determining whether to change the line width while drawing a line with the pen or to draw the line width as it was when writing, and the button (211) remains pressed. When it is drawn, the line width at the time of writing is drawn as it is, and when it is drawn without being pressed, the line width is made variable even during drawing. Fixed flag (20
When 9) is OFF, an A / D conversion command is sent to the A / D converter (706). After that, the completion of A / D conversion is awaited, and the digitalized frequency is read from the PIA (707). Next, the high and low frequencies are compared (708), and if they are high, thick line information is set in the line width storage means (210) (7).
09), medium line information is set if it is medium (710), and thin line information is set if it is low (711). Next, it is detected whether the button (211) is pressed (712), if it is pressed (713), the fixed flag (209) is turned on (714), and if it is not pressed (713), the fixed flag ( 209) is turned off (715). After that, the line width information is read (716) and the line is drawn (71).
7).

As described above, according to the embodiment, as described above, a device for varying the line width by the pen pressure can be realized,
It is possible to improve the line drawing function and operability of the pen computer.

Further, in this embodiment, the line width is set to three stages, but the line types can be increased by making the frequency height comparison finer.

[0014]

According to the present invention, in the line drawing operation of a pen computer such as a pen, a tablet, and a liquid crystal display, it has been conventionally necessary to select whether or not a line is present or to select a menu. Since the line width can be changed only by the writing pressure, the operability of line drawing can be improved.

[Brief description of drawings]

FIG. 1 is an example of an external appearance of a processing device for explaining the configuration of an embodiment of the present invention.

FIG. 2 is an example of a processing device configuration for explaining a configuration of an embodiment of the present invention.

FIG. 3 is an example of a pen structure diagram of an embodiment of the present invention (first example).

FIG. 4 is an example of a pen structure diagram of an embodiment of the present invention (second example).

FIG. 5 is an example of a block configuration diagram of a tablet unit according to an embodiment of the present invention.

FIG. 6 is a simple circuit diagram of a tablet unit according to an embodiment of the present invention.

FIG. 7 is a flowchart showing a processing procedure of an embodiment of the present invention.

[Explanation of symbols]

 201 ... Processing device, 202 ... Pen, 204 ... Display unit, 205 ... Tablet, 206 ... Writing pressure determination unit, 207 ... Line drawing software.

Claims (2)

[Claims] 1. A pen drawing system in a pen computer using a tablet, a pen, a liquid crystal display, etc., in which a line width of a line drawn by a pen writing pressure is variable, and a pen computer device. 2. When drawing on a tablet with a pen, a mechanism for detecting the pen pressure is provided on the pen side and the tablet side, and the line width drawn by the drawing software on the display device is determined based on the pen pressure information received from the pen. A pen drawing method and device that is variable (thick line, middle line, thin line, etc.).