JPS6162122A - Input device - Google Patents

Abstract

PURPOSE:To discretionally specify the width of line in graphic input in proportion to the input pressure by providing pressure detecting means to detect the amount of indication pressure at the time of cordinates input through a cordinates specifying device. CONSTITUTION:The edge point part 11 of an input pen in 9 pointing device (PD)1 touches a stylus and pushed inside the pen holder against pressure of a spring 14, then a CPU 2 reads out the pen pressure and input position cordinates values sent from PD1. Here, when the edge point 11 is pushed inside the holder, its sliding piece 13 moves on a variable resistor 12; then the amount of the movement is read as the change of resistance, and detected by a resistance detector 15. According to input cordinates, the CPU 2 calculates the address on the video RAM 5, and points to be plotted including the width of points is calculated by a plot circuit 3 basing on the pen pressure, and the figure is plotted on RAM 5. The input information thus plotted is read through a display control device 4 and displayed onto a CRT 7 through a display circuit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an input device for inputting graphic information.

[Prior Art] Digitizers and tablets are graphic input devices that detect the coordinates of points designated by a person or the like within a specific area and input them into a computer.

Conventionally, in this type of input device, a pen-shaped stylus is often used to specify an arbitrary position on the input surface, but the pen-shaped stylus generally has a microswitch or the like that is activated when writing pressure exceeds a certain level. It is built in, and when this microswitch is activated, it only uses the coordinate position of the input surface specified as the input coordinate, and even if you try to input characters that look like they were written with a brush, you cannot change the line width. , - It was only represented by a monotonous wooden line, and it was not possible to input natural characters.

[Purpose] The present invention aims to eliminate the drawbacks of the above-mentioned prior art, and enables input of pointing pressure when inputting coordinate positions, for example, detects pen pressure when inputting graphic information, and adjusts the line width of the input graphic. The purpose of the present invention is to provide an input device that can be specified arbitrarily.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to one drawing.

FIG. 1 is a block diagram of an embodiment according to the present invention, in which 1 is a pointing device (hereinafter referred to as PD); 2 is a pointing device (hereinafter referred to as PD);
is a central processing unit (hereinafter referred to as CPU), 3 is a plotting circuit, 4 is a control unit, 5 is a video RAM, 6 is a display circuit,
7 is a Rusk scan type display unit (hereinafter referred to as CRT)
It is.

The graphic information inputted from the PDI is divided by the CPU 2 into an X component (horizontal direction), a Y component (vertical direction), and pen pressure data, which are plotted and stored in the video RAM 5 by the plotting circuit 3. This stored information is stored in the display control section 4.
The data is read out under the control of the controller, sent to the display circuit 6, and displayed on the CRT 7.

The appearance of the PDI is shown in Figure 2, where 9 is the stylus;
Reference numeral 10 denotes a pen, and the pen 10 directs nine surfaces of the stylus.

The detailed structure of this pen 10 is shown in FIG.

3rd rl! In J, 11 is the pen tip, 12 is the variable resistor,
13 is a slider, 14 is a spring, and 15 is a resistance value detector.

When the pen 10 is brought into contact with the stylus 9 to detect the coordinates and the writing pressure at that time, when the pen 10 is pressed against the stylus 9, the pen tip 10 is first pushed into the pen housing.
At the same time, the sliding conductor 13 moves on the variable resistor 12.

This amount of movement is detected by the resistance value detector 15 as a change in resistance value, and the pen pressure is determined based on the detected resistance value.

The relationship between pen pressure and input position coordinates when a point (Xt, Yx) on the stylus 9 is indicated is shown in FIGS. 4(A) to 4(C).

If the pen pressure is high, the indicated position coordinates (X
For example, thickening is performed around 12 points around rJJ4 (A), as shown by the white circles in Figure 4 (A), and when the pen pressure is medium, as shown in the white circles in Figure 4 (B). Execute thick processing over four points. If the pen pressure is low, only the indicated coordinates are valid.

Based on the coordinates specified in this way, plot the video R
Deployed on AM5.

Expanding (plotting) the input coordinates onto this video RAM 5
The process will be explained in detail with reference to the flowchart shown in FIG.

When the pen tip 11 of the PDI input pen 10 is pushed into the pen housing against the spring pressure of the spring 14, the CPU 2 reads the input position coordinates and pen pressure from the PDI, and in step S2 stores the input position coordinates on the video RAM 5. Based on the pen pressure read in step S3, the plotting circuit 3 calculates the point (position) to be plotted including the coordinates for the thickening process, and in step S4
Plot to . Then, in step S5, continue with PDI.
It is checked whether there is any further input, and if there is a subsequent input, the process returns to step S1 and the input position coordinates are read. If the input has been completed, the process ends.

To explain the actual plotting process on the video RAM 5 when the characters ``long'' are input from the PDI of this embodiment, the part surrounded by O in Figure 6 for ``long'' is particularly affected by pen pressure. It is a part. When the plotting process shown in FIG. 5 is executed, the font is plotted on the video RAM 5 in a font that is very similar to that drawn with a brush, as shown in FIG.

The input information plotted on the video RAM 5 is read out by the display control section 4 at any time and displayed on the display surface of the CRT 7 via the display circuit 6.

〔effect〕

As explained above, according to the present invention, it is possible to detect the amount of input pressure as well as the input of position coordinates, so it is possible to make SQ@ proportional to the input pressure, and it is different from when writing on plain paper using a brush. An input device capable of inputting similar character patterns can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is an external view of the pointing device shown in FIG.
B! Figure 3 is a detailed diagram of the input pen of the pointing device of this embodiment, Figures 4 (A) to (C) are diagrams for explaining the relationship between input coordinates and pen pressure in this embodiment, 11
FIG. 5 is a control flowchart of this embodiment, FIG. 6 is a diagram showing changes in pen pressure when inputting characters, and FIG. 7 is a diagram showing an example of plotting on the video RAM when inputting characters shown in diagram t36. In the figure, 1... FD, 2... CPU, 3... Plot circuit, 4... Display control part 1, 5... Video RAM
, 6... Display circuit, 7... CRT, 9... Stylus, 10... Input pen, 11... Pen tip portion, 12
. . . variable resistor, 13 . . . sliding conductor, 14 . . . spring, 15 . . . resistance value detector. Figure 1 Figure 2 Figure 4 (A) Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] In an input device for inputting graphic information, which includes a coordinate specifying means for specifying a coordinate position, and a coordinate detecting means for detecting the coordinate position specified by the coordinate specifying means, when the coordinate position is input by the coordinate specifying means. An input device comprising pressure detection means for detecting a commanded pressure amount.