JPS60200318A - position detection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention significantly increases the insertion rate in an automatic electronic component insertion machine by automatically measuring and correcting the misalignment of the insertion hole before inserting the electronic component. This invention relates to a position detection device (hereinafter referred to as PSD) that has made it possible to improve the position detection device.

Conventional configurations and their problems Today, in the electronics industry, the insertion of electronic components into printed circuit boards is no longer done manually, but demand is increasing.

This is now carried out using computer-controlled automatic insertion machines for various electronic components that are compatible with diversification.

These automatic insertion machines determine in advance the insertion order of electronic components and the insertion position of printed circuit boards on the Although it is a method that automatically inserts the insertion hole according to the direction, it can only be inserted in a predetermined position, and the holes are made smaller due to high-density mounting to miniaturize electronic devices, so the insertion hole position may shift even slightly. There was a problem that defects occurred and the product was discarded.

One of the countermeasures devised for this purpose is a method of detecting the deviation of the hole position using an ITV camera. Automatic insertion machines using this method have already been put into practical use and are helping to improve the proper insertion rate. FIG. 1 shows a hole position detection device using this ITV camera method.

This figure shows the ITV camera 4 detecting the position of the insertion hole 3 of the printed circuit board 2 into which the insertion head 1 is about to insert an electronic component. First, main body 5
A beam of light projected from a light source 6 controlled by a printer hits a printed circuit board 2 on an X-Y table 7. Of the light, the ITV camera 4 captures the spot light that passed through the insertion hole 3,
The central value (xy coordinates) of the New Year's Day is sent to the main body 5 via the adapter 8. The main body 6 compares this value with a preset value, calculates the correction amount, and sends it to the control device 9 of the insertion machine. As a result, X-Y table 7
However, there is a correction movement.

A monitor television 1o for observation is connected to this device. Automatic insertion machines equipped with this device have an improved rate of proper insertion compared to those without.

However, in this correction device, the ITV camera 4 is expensive, and the vibration of the insertion head etc. has a negative effect on its lifespan. Therefore, there was a problem in that a large amount of time was lost compared to the operation of moving directly to the insertion head.

A device that solves these problems and can perform similar corrections has been desired.

OBJECTS OF THE INVENTION The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks, fully utilize the advantages of PSD, and improve the insertion rate by positioning holes in printed circuit boards with high precision and high speed. An object of the present invention is to provide a position detecting device with a high level of accuracy.

Structure of the Invention The position detection device of the present invention includes a light source that generates a parallel light flux that irradiates an electronic component insertion hole on a printed circuit board, and a light receiving source that passes through the insertion hole among the light flux emitted from the light source. Then, based on the PSD that electrically checks the X and Y coordinates of the light-receiving point and the output of the above-mentioned element, the deviation between the hole position that should originally be inserted and the current hole position is determined, and the X-Y table is corrected. It consists of a measuring device that outputs the amount of movement, and an NC control section that controls the X-Y table based on the amount of movement, and by taking advantage of the advantages of PSD, it is possible to realize an inexpensive and easy-to-use detector. This makes it possible to incorporate the system into the system, and the time loss during the correction can be significantly reduced.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. First, FIG. 2 shows how to attach the detection section. Here, a light source 6 is attached to the insertion head 1, and a detection element PSDll is attached to the anvil 12. The electronic component automatic insertion machine attempts to insert the electronic component according to the program and brings the insertion hole 3 of the printed circuit board 2 to the specified position. A hole position correction operation is performed during this process. First, the insertion hole 3 is moved to a position directly below the calculated light source, which is calculated by adding the offset between the light source 6 and the insertion head 1. At this time, the light source 6 is irradiated with a parallel light beam 13 having a constant wavelength. Therefore, the parallel ray 1 that passed through the insertion hole 3
3 reaches the surface of PsDll attached to the anvil 12 below the printed circuit board 2.

FIG. 3 shows a detection method using a PSD, and the PSDll immediately narrows horizontally in the iXY direction at the position iXY of the center 14 of New Year's Day drawn by the arriving light ray, and sends it as a signal to the arithmetic circuit. Center 14 on New Year's Day is center 1 of the programmed insertion hole position.
6, but even if there is a deviation, it is sufficient to record the value and send it to the correction control section for correction.

Based on this idea, the present invention detects and corrects the displacement of the insertion hole position.

Here, the principle of PSD will be explained. A PSD has a cross-sectional structure in which a uniform resistance layer is formed on one or both sides of a high-resistance semiconductor (silicon), and a pair of electrodes for signal extraction are provided at both ends of the layer. When a light beam is incident on the surface of this element, a photocurrent proportional to the incident energy is generated from the light incident position due to the photoelectric effect. This current is then divided and extracted from each electrode in inverse proportion to the resistance value up to each electrode. PSDll is a two-dimensional structure of such an element. xl, x2. The two pairs of currents Yl and Y2 are each amplified by a preamplifier 16, and are separately amplified by a differential amplifier 1 for the x and Y axes.
7, and the correction amount is N C: +7) CI
The data is sent to the controller 18, and the predetermined NO data is changed by the correction amount to drive the servo motor 18 of the X-Y table.

FIG. 4 shows an example of the operation panel of such an apparatus, and the amount of correction is displayed on a digital display 19.

Effects of the Invention As is clear from the above explanation, according to the position detection device of the present invention, even if the insertion hole position of the printed circuit board is slightly shifted, the center of the hole can be instantly aligned with the insertion head in the μ order. This has the effect of significantly improving the insertion rate.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a conventional camera system, FIG. 2 is a perspective view showing the configuration of an example of the optical system of a position detection device according to an embodiment of the present invention, and FIG. 3 is a PSD output of the present invention. FIG. 4 is a front view showing the configuration of an example of the operation panel. 1... Insertion head, 2... Printed circuit board, 3... Insertion hole, 4... ITV camera, 5... Recognition body, 6...Light source, 7.
...X-Y Tape Nope 8...Adafuri,
9----Control device, 10... Monitor TV, 11... PSD, 12... Anvil, 13. Old... Parallel rays, 14.15.・・・・・・
Party center, 16... Preamplifier, 17...
... Differential amplifier, 18 ... NC controller, 19. Old ... Servo motor. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 4 Figure 8

Claims (1)

[Claims] a parallel light source that illuminates an electronic component insertion hole on a printed circuit board; a position detection element that detects the X and Y coordinates of a light receiving point that receives light that has passed through the insertion hole among the light emitted from the light source; a measuring means for converting the output of the element into a moving distance to be corrected on an X-Y table;
- a position detection device comprising: NC control means for controlling the Y table;