JPS59145908A - Coordinate input device - Google Patents

Abstract

PURPOSE:To input exactly a coordinate by a simple structure by connecting two wires to a measuring point, and deriving a coordinate of the measuring point from a feed size of these two wires. CONSTITUTION:Two wires 6a, 6b are connected to a measuring point 2 which moves on a table 1. On the other hand, feed parts 4, 5 of two wires 6a, 6b are placed through a prescribed distance on a side position of the table 1. Also, a detecting means for outputting a feed length of the wire by an electric signal is provided on each feed part 4, 5. These feed parts 4, 5 are reels 4b, 5b for winding in the wire, and the detecting means is formed by disks 4c, 5c provided on each reel and sensors 7a, 7b for detecting a rotating quantity of the disk. A coordinate of the measuring point 2 is derived basing on a feed size of two wires. In this way, the coordinate can be inputted exactly by a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coordinate input device for inputting information such as graphics into a computer.

- Digitizers are generally used as devices for inputting graphical information into computers.

This conventional digitizer consists of a five-tablet board and a stylus pen that detects a predetermined position on the tablet board. Wires are stretched around the edges of the tablet board in the X-axis direction and the Y-axis direction at minute intervals. Pulses are generated simultaneously in the wire in the X-axis direction and the wire in the Y-axis direction. When a desired position on the tablet board is indicated by the stylus pen, the sensing coil of the stylus pen detects the pulse signal being transmitted to the wire. A binary counter counts the time from when a pulse signal is emitted until it is detected by the stylus pen, and by multiplying the counted value by a certain constant, the X and Y coordinates indicated by the stylus pen can be detected. It has become.

However, with the conventional digitizer described in -L, it is possible to accurately measure the spacing, straightness, etc. of the wires stretched on the tablet board.
Therefore, the accuracy of I-printing of the tablet board must be compromised, leading to high costs. Further, the control device requires a pulse generator, a pulse detection coil, a binary counter, a coordinate calculation calculator, etc., and is an expensive device.

The present invention has been made in view of the problems of the prior art described in 1-1 above, and an object of the present invention is to provide a coordinate input device that has a simple structure and can reliably input graphical information manually.

The coordinate human power device according to the present invention includes Table 1. Two wires are connected to the measurement point that moves, and supply sections for these wires are placed at predetermined intervals on the side of the table, and each supply section outputs the amount of wire supplied as electric signal. A detection means is provided to determine the coordinates of the measurement point based on the supply and dimensions of the two wires.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a coordinate input device according to the present invention, FIG. 2 is a perspective view showing a wire supply section of the coordinate input device, and FIG. 3 is a perspective view showing another embodiment of the wire supply section.

The reference numeral l in the figure is a table, and the fixed point N13 2 is provided on this table 11-. This measurement point 2 is a target ring, and a pen tip is inserted into this target ring 2 to trace the graphic information in the table 11-. A box 3 is provided on the side of the table l, and inside this box 3, a supply section 4 and a supply section 5 are provided.
are placed at a certain distance. In one supply section 4, a reel 4b is rotatably attached to a shaft 4a fixed in the box 3, and a wire 6a is attached to the reel 4b.
is wrapped around it. This wire 6a extends from the supply hole 3a of the box 3 onto the table l, and the end of this wire 6a is connected to the measurement point 2.

Further, the reel 4b is biased by a spring in the direction of winding the wire 6a (counterclockwise in FIG. 1). Further, a disc 4C is integrally provided on the reel 4b.

As shown in FIG. 2, detection holes are formed at predetermined intervals in this disk 4C. A photocoupler 7a faces this disk 4C. Similarly, in the other supply section 5, a reel 5b is rotatably attached to a shaft 5a fixed in the box 3, and a wire 6b is wound around the reel 5b. This wire 6b extends from the supply hole 3b of the box 3 to the table 1-, and the end of this wire 6b is connected to the measurement point 2. Also,
The reel 5b is moved by a spring in the direction in which the wire 6b is wound (
(clockwise in the figure f7s1). reel 5b
A disk 5c is integrally provided in the . Similar to the disk 4C, detection holes are formed at predetermined intervals in this disk 5C, and a photocoupler 7b faces the disk 5C. Further, two photocouplers 7a and 7b are connected to a control circuit 8. This control circuit 8 controls the rotation angle of the reel 4b and the reel 5a based on pulse signals from the photocoupler 7a and the photocoupler 7b, and further controls the rotation angle of the wire 6.
This is for calculating Shun Nakade of a and f3b.

Next, the operation of the coordinate input device having the configuration described in section 1 will be explained.

All human-powered graphic sheets etc. are set up on table 1.

Further, a pen tip or the like is inserted into the measurement point 2, that is, the target ring, and the figure on the sheet is traced together with the measurement point 2 using the pen tip. The position of this measurement point 2 can be extracted as digital information by a circuit 8. That is, when the measurement point 2 is located at point A, the amount of wire extension from the supply hole 3a is Xa, and the amount of wire extension from the supply hole 3b is Ya. Since the distance between the supply holes 3a and 3b of 2g4 is a constant value, both wires E
By knowing the extension amounts X a and Y a of fa and 8b, a triangle consisting of 3a-A-3b is determined, and the position of point A is determined. Next, when measurement point 2 is moved to point B, wire 6a further extends by xb, and wire 6a further extends by xb.
b extends by Yb. Are these new extension amounts xb and Yb the rotation angles of reels 4b and 5b using a photocoupler? a,
7b and calculated by the control device 8.

As a result, the length of the wire 6a at point B is X a +
The values of X b and the length Y a + Y b of the wire 6b are known. Therefore, the coordinates of point B can be calculated based on these two lengths. It is also possible to calculate the coordinates of point B relative to point A. Therefore, if the position of point A is determined as the origin, when the M+1 fixed point 2 is moved to an arbitrary position, the amount of extension of the wires Eia and 8b will be adjusted to the reel 4a.
, 4b, and output the coordinates of the position as digital information. Therefore, this coordinate input device can be used as a computer input device to input graphic information.

Next, Figure t53 shows the supply section 11 according to another embodiment. This supply section 11 includes a linear code plate 11a connected to the base end of the wire 6a, and a linear code plate 11a connected to the base end of the wire 6a.
It consists of a spring llb that pulls back the . A large number of detection holes are formed at predetermined intervals in the linear code plate 11a. A photocoupler 12 faces this linear code plate 11a.

411 When the fixed point 2 (see FIG. 1) moves and the wire 6a extends, the spring Ilb extends. The moving layer of the linear code plate 11a that moves according to the amount of extension of the wire 6a is detected by the photocoupler 12 and output to the arithmetic circuit.

Furthermore, in all of the illustrated embodiments, the detection hole of the disk or linear code plate is detected by a photocoupler to measure the amount of wire extension, but as an example of other detection means,
Disc or linear coated plate! - An uneven conductor pattern may be printed at predetermined intervals, and a conductive brush may be slid on the pattern to generate pulses corresponding to the wire supply area. Alternatively, the magnetic scale may be moved in accordance with the extension of the wire, and the movement jt of the magnetic scale may be detected by a magnetic sensor opposing the magnetic scale. Further, as means for detecting the amount of wire extension, a resistor (potentiometer) or a differential transformer is used. In this case,
Since the amount of wire extension is detected by analog value,
This is converted into a digital value using an A/D converter and inputted to an arithmetic circuit to detect the coordinates of the measurement point.

Further, the wires 6a and 6b are not limited to linear wires, but tape-like wires can also be used.

As described in -1- above, according to the present invention, coordinates can be calculated based on the amount of extension of two wires extending to a measurement point, so coordinates can be input using a cylinder structure compared to conventional digitizers. It becomes like this. In addition, since the amount of wire extension can be detected, it is possible to detect coordinates without using a complicated control circuit.Also, there is no need to install pulse transmission wires on the table. , Ka'
It can be manufactured at low cost without requiring high precision.

[Brief explanation of drawings]

1 is a plan view of a coordinate input device according to the present invention, FIG. 2 is an enlarged perspective view of a part of FIG. 1, and FIG. 3 is a view corresponding to FIG. 2 showing another embodiment. l...Table, 2...Measuring point, 3...Box, 4, 5...Supply section, 4b, 5b...Reel, 4c, 5c...Disc, ea, 6b...・
Wire, ? a, 7b...photo coupler, 11...
Supply unit according to other embodiments, 11a... linear encoder, 12... photocoupler

Claims (3)

[Claims] (1) Two wires are connected to the measuring point where the table 7 is moved, and two wire supply sections are arranged at the side positions of the table at a predetermined distance, and each supply section for,
A coordinate human-powered device equipped with a detection means that outputs the length of wire to be supplied using an electrical signal. (2) The supply unit is a reel that winds the wire, and
The coordinate input device according to claim 1, wherein the detection means comprises a disk provided on the reel and a sensor for detecting the amount of rotation of the disk. (3) The supply unit is a linear code plate connected to the wire end and a spring that pulls back the linear code plate; 11.
The human coordinate system according to claim 1, wherein the detection means is a sensor that detects the movement M of the linear code plate.