JPS6285802A - Automatic inspecting device for object to be inspected provided with punch hole - Google Patents

Abstract

PURPOSE:To automate measurement result and statistical processing by inspecting the outward appearance of an object to be inspected and measuring its size by a system which uses an optical sensor. CONSTITUTION:The object to be inspected is mounted on the glass surface of the X table 2x of a mounting table 2 of a universal projecting machine 1. Then the mounting table 2 is moved (by motors 6, 7) according to a teaching program stored in an disk 20 for program. Thereafter, signals from the optical sensor 9 and a linear scale 3 are inputted to a counter 12 and a CPU 13 determines the coordinates of a measurement point of the object to be inspected on the based on said signals. The signal indicating the determined coordinates is inputted to a CPU 16 and stored on a disk 17 for data collection. Arithmetic processing such as the measurement of the size of the object to be inspected or appearance inspection is carried out according to an arithmetic program stored previously on a disk 20 and the result is printed and displayed 21. The data which is obtained by the arithmetic processing and stored temporarily on the disk 17 is processed statistically according to an integrated program set and stored on the disk 20 and the result is printed and displayed 21.

Description

[Detailed Description of the Invention] <Prior Art> Generally, a universal projector is used for visual inspection and dimension measurement of precision machined parts (hereinafter referred to as inspected objects) provided with punched holes, such as IC lead frames. was used. Specifically, the object to be inspected is placed on the stage of a universal projector, irradiated with light from below, the shape of the object to be inspected is enlarged with a zoom lens and projected onto the screen, and the projected shape is displayed on the screen. Appearance inspection and dimension measurements were performed visually using the upper crosshairs.

<Problems to be Solved by the Invention> In the appearance inspection and dimensional measurement of the inspected object using the conventional universal projector as described above, ■The appearance inspection and dimensional measurement use the crosshairs on the screen. This is done with the naked eye, so there is a problem that there may be a difference in reading x.Furthermore, various measurements are done manually, so if there are many measurement points on the object to be inspected, it will take a long time to measure. Moreover, it takes time to check whether the measurement results are within the tolerance range set in advance; There is a problem that a lot of time is spent on processing and it costs money, and furthermore, because of the above problems ■, ■, and ■, it is not possible to perform visual inspections and dimension measurements of a large number of objects to be inspected within a specified time. There was a point.

As a result of intensive research to solve the conventional problems mentioned above,
In the apparatus of the present invention, the appearance inspection and dimension measurement of the object to be inspected is done by eliminating the method of reading with the naked eye using the crosshairs on the screen, and instead uses a method of using an optical sensor instead of the crosshairs. Furthermore, the measurement results are automatically processed, and statistical processing is also performed automatically.

That is, the automatic inspection device for the object to be inspected according to the present invention includes (a) a stage on which the object to be inspected with punched holes is placed and movable by the drive of a pulse motor; (b) a signal from the linear scale of the universal projector; and (b) a signal from the linear scale of the universal projector. (c) a measuring point coordinate determining means for determining the coordinates of a measuring point of the object to be inspected by inputting a signal from the optical sensor; a central processing unit consisting of a storage control means for controlling the drive of the pulse motor of the machine; and an arithmetic and statistical processing means for performing calculations and statistical processing based on the data input and stored in the storage control means; d) Printer means for printing out the results of the arithmetic and statistical processing, which is connected to the arithmetic and statistical processing means of the central processing unit.

With the above configuration, the edge of the object to be inspected enlarged and projected onto the screen is detected by the optical sensor as it changes from bright to dark or from dark to bright, so no reading errors occur. Further, the coordinates of the measurement point of the object to be inspected are automatically determined by the measurement point coordinate determination means, and data processing based on the measurement point coordinates is automatically performed by the central processing unit, and the processing results are printed by the printing means. Please print it out.

The present invention will be explained below based on the embodiments shown in FIGS. 1 and 2.

Figure 1 is a block diagram showing an overview of the device of the present invention.
In the figure, 1 is a universal projector, 11 is a measuring point coordinate determining means, 14 is a central processing unit, and 21 is a printing means. Measurement point coordinate determining means 11 includes a counter 12 and CPUZ-8.
013, the central processing unit 14 is the storage control means 1
5 and an arithmetic and statistical processing means 18. The universal projection 8!1 includes a workpiece 2 consisting of an X table 2X and a Y table 2y, a linear scale 3, a zoom lens 4, and the shape of the object placed on the workpiece 2 as a light source ( (not shown), a screen 5 that is enlarged and projected by a zoom lens 4, a pulse microscope that drives the X/table 2X of the document stand in the X-axis direction of the x-y coordinate axis, and a Y/table 2y of the document stand. ? It is equipped with a pulse motor 7 for driving in the y-axis direction, and an optical sensor 9 provided at a predetermined distance from a cross line 8 carved in the center of the screen 5.

As shown in FIGS. 2(A), (B), and (C), the linear scale 3 consists of an X linear scale 3X and a Y linear scale 3y.
In the X-axis direction of the coordinate axis, Y linear scale 3 yI;t
It is fixed in the X-axis direction. Loading stand X table 2
As shown in FIG. 2(A), the center of the X is formed of transparent glass 10 so that an object to be inspected can be placed on it and irradiated with light from a light source. Further, the pulse motors 6 and 7 are driven and controlled by the storage control means 15 of the central processing unit 14.

The optical sensor 9 detects the edge of the object to be inspected enlarged and projected on the screen 5 as it changes from bright to dark, and sends a reading signal (1-Riga) to the counter 12. A pulse signal indicating the X coordinate and the X coordinate generated by the movement of the X table 2X and the Y table 2y in the
Coordinate values and yFii! The target value is now displayed. The CPUZ-8013 receives the reading signal (trigger) from the optical sensor 9 output from the counter 12 and the pulse signal to read the linear scale 3, and also reads the optical sensor 9 and the linear scale 3. It also controls.

The storage control means 15 of the central processing unit 14 is a CPU8086.
・Comprised of 8087 16 and data collection disk 17, arithmetic and statistical processing means 18 consists of CPU 8086/8087
19 and a program disk 20.

The storage control means 15 reads and stores the linear scale values sent from the CPUZ-8013, and also operates the pulse motors 6 and 7 to move the X/table 2x and Y table 2y of the stage in a predetermined direction for inspection. It operates by sending a control signal to the Calculation and statistical processing means 1: i Performs calculations for appearance inspection and dimension measurement of the inspected object based on information stored in the storage control means 15 according to a preset calculation program, and calculates the calculation results and the calculation results. The statistical processing results based on the printer 22 or
It operates to display on Y block-23.

The central processing unit 14 is provided with two disks, one disk for programs and one disk for data collection. The program disk contains a teaching program for instructing this device in advance on the measurement procedure and measurement points for the object to be measured, as well as the external shape and dimensions of the object based on the measurement point values automatically measured according to the teaching program. A calculation program for performing calculations and comparison with preset tolerances, and a statistical processing program for statistically processing measurement and calculation results are stored.

The measurement points taught in the above-mentioned teaching program can be limited to five types: point, circle, ellipse, square, and pitch. In addition, the above-mentioned calculation blogelam performs calculations based on the above-mentioned five types of measurement point data, and the calculation commands can be roughly divided into coordinates, distance, angle, intersection, line, division, area, tangent, pitch, etc. are available, and by using these, it is possible to calculate the position and dimensions of almost any part of the object to be inspected.

In addition, the above statistical processing program is prepared with measurement data X1 average number This makes it possible to perform fine-grained quality control and to respond quickly to the field.

The printer 22 is connected to the arithmetic and statistical processing means 18 of the central processing unit 14, and prints out arithmetic results during automatic measurement, statistical processing results, and inspection sheets. The X-Y plotter 23 is used for statistical processing that requires plotting.

When measuring the object to be inspected (first, place the object to be inspected on the glass surface 1 of the stage 2 of the universal projector 1
0, so that one side of the object to be inspected (for example, the longitudinal axis of a rectangular object to be inspected) is approximately parallel to each other. In this case, since this device automatically searches and determines the coordinates, it is not necessary to place the object accurately (parallel).
The settings are stored in the gologram disk 20 by the CPUs 8086 and 8087 16. This is done by driving and controlling the pulse motors 6 and 7 according to the teaching program to move the stage 2. That is, the signal from the optical sensor 9 and the signal from the linear scale 3 are input to the counter 12, and the CPUZ-8013 determines the coordinates of the measurement point of the object to be inspected based on these signals. The signal indicating the coordinates is sent to the CPU8086/8.
087 16 and stored in the data collection disk 17. Then, calculation processing such as dimension measurement or appearance inspection of the object to be inspected is performed according to the calculation program set and stored in advance in the program desk screen 20, and the printer 21 or X
It is printed out on -Yp, Lock-23. In addition, the arithmetic-processed data (temporarily stored in the data collection disk 17) is statistically processed according to a statistical processing program that is preset and stored in the program disk 20, and then sent to the printer 21 or the X-Y plotter 23. It will be printed out.

Effects> As mentioned above, the automatic inspection device for the inspected object provided with the punched holes according to the present invention has the following effects: No reading errors occur during measurement; ■ By making full use of calculation programs and statistical processing programs, more advanced calculations and measurement results can be processed; ■ Printing out during automatic measurement of the inspected object. Since the data obtained includes tolerance verification, defective products can be detected quickly. ■ Furthermore, due to the reasons mentioned above, it is useful in high-tech fields and various other fields that require positional and dimensional accuracy. It has the advantage of being a device suitable for measurement in the industrial field and quality control.

[Brief Description of the Drawings] Figure 1 is a block diagram showing an overview of the device of the present invention, and Figure 2 (
A), (B), and (C) are a plan view, a front view, and a side view showing the positional relationship between the stage and the linear scale, respectively. 1 - Universal projector, 2 - Stage, 3 Linear scale, 5 Screen, 6.7 - Pulse motor, 9 Optical sensor, 11 - Measurement point coordinate determination means,

Claims (1)

[Scope of Claims] (a) A stage on which an object to be inspected having a punched hole is placed and movable by the drive of a pulse motor, and a linear system for teaching the front and back of the measurement position of the object to be inspected. (b) a signal from the linear scale of the universal projector and a signal from the optical sensor; (c) A signal from the measurement point coordinate determination means is input and the signal from the measurement point coordinate determination means is input to determine the coordinates of the measurement point of the object to be inspected, and drive control of the pulse motor of the universal projector is performed. (d) a central processing unit comprising a storage control means for performing the above operations, and an arithmetic and statistical processing means for performing calculations and statistical processing based on the data input and stored in the storage control means; An automatic inspection device for an object to be inspected, which is provided with a punched hole, comprising: printing means for printing out the arithmetic and statistical processing results, which is connected to the arithmetic and statistical processing means;