JPH02213923A - Inspection back-up device - Google Patents

Abstract

PURPOSE:To inspect the presence or absence of a local coordinate error in a simple and quick way by detecting successively the coordinate positions of a pointing part during the operation of a scan means and displaying the locus pictures obtained from the detected coordinate positions. CONSTITUTION:A scan means 203 applies the 2-dimensional scan to a pointing part 202 which inputs the coordinates on a tablet 300 along a locus of a prescribed from on the tablet 300. A coordinate detecting means 400 detects successively the coordinate positions of the part 202 during the operation of means 203. Then a display means 102 displays the locus pictures based on those detected coordinate positions. Thus the means 203 scans the part 202 along a locus of a prescribed form on the tablet 300. Then the locus pictures obtained in response to the coordinate data on the part 202 are displayed for decision of the presence or absence of a local coordinate error. Thus it is possible to inspect the local coordinate errors on a tablet in a simple and quick way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inspection support device, and particularly to an inspection support device for inspecting the accuracy of a coordinate input device.

[Prior Art] Currently, there are various types of devices for inputting absolute coordinates on a tablet, such as an electromagnetic induction method, an electrostatic method, an ultrasonic method, and a resistive film method.

Normally, the quality of these products is determined before they are shipped from the factory, including a check of coordinate detection accuracy.

There are various fm methods for accuracy checking, but for example, in the case of a coordinate input device that uses a resistive film method, as shown in Figure 8, multiple reference points are set within the effective input coordinate area, and the industrial In some cases, pressing is performed accurately using a pressing means such as a robot. Then, the accuracy of the coordinate input device is measured based on the amount of deviation between the detected coordinate values and the actual coordinate values.

An outline of the accuracy check will be explained using FIG.

The illustration shows an ideal value calculated from the standard detection voltages Vx, , Vxb at the reference points x, , xb in the X-axis direction and Vxa, Vxb at each point as a straight line. and,
Among the group of actually detected coordinate values, using the voltage difference Vm between the detected voltage at the point with the largest difference from the straight line and the straight line,
Accuracy is calculated based on the following formula.

Based on this result, the quality of the tablet was determined.

[Problems to be Solved by the Invention] Coordinate deviations related to accuracy in a tablet include fluctuations in linearity and local coordinate deviations. The former can be measured using the conventional example, but to deal with coordinate deviations, it is necessary to make the surveying pitch finer and increase the number of measurement points.

However, the increase in the number of measurement points causes an increase in the measurement time, and when considering mass production, it is practically impossible to measure and it is impossible to judge whether the product is good or bad.

The present invention has been made in view of such problems, and it is an object of the present invention to provide an inspection support device that makes it possible to inspect the presence or absence of local coordinate deviations simply and in a short time.

[Means for Solving the Problem] An inspection support device of the present invention that solves this problem has the configuration shown below. That is, the tablet inspection support device of the coordinate input device includes a scanning means for two-dimensionally scanning an instruction section for inputting coordinates on the tablet surface along a locus of a predetermined shape on the tablet surface; The apparatus includes a detection means for sequentially detecting the coordinate position of the instruction section during scanning, and a display means for displaying a trajectory image based on the detected coordinate position.

[Operation] In the configuration of the present invention, the scanning means scans the instruction section on the tablet along a trajectory of a predetermined shape.

By displaying a locus image corresponding to the coordinate data of the indicator obtained during this time, it is determined whether there is a local coordinate shift.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the inspection system in this embodiment, and FIG. 2 shows the state during actual inspection processing.

In the figure, 100 is a control device that controls the entire system. The control device 100 is an electronic device composed of a so-called microprocessor and the like, as shown in the figure (including a control program memory 101 that stores operational processing procedures, a display section 102 that displays various messages and images to be described later, It has a keyboard, etc. The control program 101 stores a program related to a flowchart in FIG. 6, which will be described later.

200 is a plotter, and 201 is an input pen 20.
3 in the X and Y directions. 202 is a pen holder, and 203 is an arm that slidably holds the pen holder 202 in the Y direction and is itself movable in the X axis direction. 300 is a tablet to be inspected, which is fixed at a predetermined position on the plotter 200. 400 is a coordinate detection circuit, which is connected to the terminal 301 of the tablet 300 through an electrode wire.

Further, the coordinate detection circuit 400 outputs coordinate data calculated based on the obtained voltage value to the control device lOO.

Explanation of processing outline (Figs. 3 to 5) In the inspection system of this embodiment with the above-described configuration, the input pen 201 traces a trajectory (pattern) as shown in Fig. 3 to the plotter 200. Outputs commands such as At this time, the detection circuit 400 performs coordinate detection at a sampling speed determined from the pattern input speed and the required resolution pitch, and upon receiving a coordinate sending request from the control device 100, sends the data to the control device 100. It is designed to be output. In other words, after the control device 100 sends a pattern input (scan) start command to the block 200,
The process of requesting data from the detection circuit 400 and fetching the data is repeated. Then, when the scan end interrupt occurs, the control device 100 performs the following operations.
The data captured so far is displayed on the CRT.

Note that data display may be performed together with data input processing.

Figure 4 shows a display example in this embodiment, in which coordinate points obtained at 2 mm pitch in the X direction and arbitrary points adjacent within the resolution pitch in the Y direction are connected and displayed with straight lines. It is something.

The illustration shows that a coordinate shift has occurred in a region 40. Coordinate deviations can be visually detected and confirmed due to disturbances in a certain pattern. In this way, since attention is focused only on the relative deviation of the specific pattern, there is no need to press the reference position with high precision, and multiple points can be detected at high speed.

Here, the pattern is mainly used to discover coordinate deviations in the X-axis direction, but the Y-axis direction can be realized by setting a pattern in a direction perpendicular to the previous pattern and performing scanning.

Furthermore, the shape (trajectory) of the specific pattern is not limited to this. That is, it can be used as long as it has a component perpendicular to each axis direction. For example, by scanning diagonally, it is possible to inspect both the X and Y axes at the same time. Although it is possible to use not only straight lines but also curves, figures, etc., it is preferable to use a pattern consisting of predetermined regular straight line segments in order to be able to recognize coordinate deviation points in a congratulatory manner.

By the way, when the coordinate deviation is small or when inspecting the details of the coordinate deviation state, it is difficult to use only the above-mentioned example.

Therefore, in this embodiment, after the above-mentioned overall scan, the location where the coordinate shift has been confirmed is rescanned at a finer pitch and at a slower scan speed, and the result is enlarged and displayed on the screen to facilitate determination. I can do it.

An example will be explained using FIGS. 5(a) and 5(b).

Now, suppose that a display as shown in FIG. 5(a) is obtained in the first scan. The operator points out the location (for example, area 50) where the coordinate deviation is likely to occur using the control device 10.
Specify by operating the keyboard (not shown) connected to 0. In response to this input, the control device 100 sends a command to the block 200 to scan the designated area at a finer pitch and at a lower speed. Thereafter, after the scan is completed, the area 50 is enlarged and displayed as shown in FIG. 5(b) (image 50°).

Although it is naturally possible to immediately make a judgment based on this display, a more reliable judgment can be made by displaying the hair cursor 51 as a criterion as shown in the figure.

This hair cursor 51 is movable (by keyboard operation) and can be placed on a location where a coordinate shift has occurred. This makes it possible to reliably know the extent of the coordinate shift, and it is also possible to specifically and quantitatively determine, for example, that it is acceptable if the amount of shift falls within the hair cursor 51. Of course, the shape and width of the hair cursor 51 are arbitrary and may be set according to the purpose.For example, in the case of horizontal scanning, it may be changed to a horizontal cursor.

Description of Processing Procedures (FIG. 6) Based on the processes described above, the processing contents of the control device 10° will be explained according to the flowchart of FIG. 6.

First, in step S1, the plotter 200 and the control device 100
The display unit 102 and the like are initialized, and then step S2
Select the scanning direction of the tablet to be inspected.

Then, based on the selected direction, step S3. S4
The scan direction and speed data for each direction are output to the plotter 200.

After setting the parameters related to scanning in the plotter 200 in this way, in step S5, the plotter 200
Sends a scan start command to 00. Then, in step S6, the data detected from the coordinate detection circuit 400 is input. And this process is done on tablet 200
This is repeated until there is an interrupt from the drive circuit indicating the end of the scan process.

Now, when an interrupt signal indicating the end of scanning is received, the process proceeds to step S8, where the input coordinate data is connected with a straight line and displayed.The entire scan result is now displayed. . If the pass/fail judgment can be made here, the process may be terminated as is.

If the determination is ambiguous, the process proceeds to step S9,
Point out the ambiguous parts. If it is determined in step S10 that there is an instruction for that location, step S1
1, parameters for rescanning the details of the indicated location are output to the plotter 200. Note that the scanning direction at this time is processed as being the same as the previously set direction.

In step S12, an instruction is given to start scanning. Then, in step S14, the coordinate data in step S13 continues to be captured until it is determined that the enlargement scan is completed. When the end of the scan is detected,
An enlarged image based on the input data is displayed on the display unit 102.

Thereafter, the process proceeds to steps S16 to S18, and a red crane is displayed at the designated position until the operator determines whether the product is good or bad.

After this, you can return to the start and continue in the other direction.

Description of another embodiment (Fig. 7) Furthermore, as another embodiment, by combining with the linearity inspection described above, it is possible to simultaneously inspect the overall linearity and local coordinate deviation, and It is possible to carry out reliable inspections efficiently.

An example of this is shown in FIG. 7, in which scanning is performed in a pattern that passes through the reference points, the scanning is stopped on the reference points, the coordinates are determined, and then data is input. Then, scanning is performed while detecting arbitrary coordinates until the next reference point. Then, after the scan is completed, by displaying the screen and calculating the linearity, it becomes possible to perform a more comprehensive inspection.

[Effects of the Invention] As explained above, according to the present invention, it is possible to easily and quickly inspect whether there is a local coordinate shift on the tablet.

In addition, by finely scanning the desired area,
More detailed inspection becomes possible.

Furthermore, by detecting the coordinates of the reference point of the tablet during the scanning process, the error of the entire tablet can also be automatically calculated, making it possible to perform a comprehensive inspection.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the system in this embodiment, Fig. 2 is a diagram showing the scanning process in this embodiment, Fig. 3 is a diagram showing the scanning locus in this embodiment, and Fig. 4 is a diagram showing the coordinates in this embodiment. Figure 5(a) is a diagram showing an example of displaying deviations. Figure 5(a) is a diagram showing an example where the coordinate deviation is not noticeable. Figure 5(b) is the coordinate deviation due to rescanning of the partial area of Figure 5(a). FIG. 6 is a flowchart showing the processing contents in this embodiment. FIG. 7 is a diagram showing the relationship between the scan locus and sampling position in another embodiment. FIG. 8 is a sampling reference point. FIG. 9 is a diagram for explaining the principle of accuracy calculation. In the figure, 100...control device, 101...control program, 102...display section, 200...block, 2
0... Input pen, 2... Pen holder, 203... Arm, oO... Tablet,... Electrode, 400... Coordinate detection circuit. Figure 4 Figure 5 (a) Figure 5 (b) Y Figure 7 Figure 8 Figure 9 Actual holiday X

Claims (3)

[Claims] (1) An inspection support device for a tablet as a coordinate input device, comprising a scanning means for two-dimensionally scanning an instruction section for inputting coordinates on the tablet surface along a locus of a predetermined shape on the tablet surface; and the scanning means. An inspection support device comprising: a detection means for sequentially detecting the coordinate position of the instruction section during scanning; and a display means for displaying a trajectory image based on the detected coordinate position. (2) specifying means for specifying a desired area in the trajectory image displayed by the display means; and specifying an area on the tablet corresponding to the specified area at least more finely than the scanning means and in a predetermined trajectory shape; and a second display means for displaying an enlarged image based on the coordinate position of the second scanning means detected by the detection means during scanning. The inspection support device according to claim 1. (3) a control means for controlling the scanning means so that at least the trajectory of the scanning means passes through a plurality of preset reference points on the tablet to be inspected, and detecting coordinate values at each reference point; and the control means 2. The inspection support device according to claim 1, further comprising calculation means for calculating the accuracy of the tablet based on the coordinate position of each reference point obtained by the control.