JPS63312695A - Positioning control system for electronic parts - Google Patents

Abstract

PURPOSE:To find correctly misregistration in a stable level state and control positioning of electronic parts by taking images of two patterns having different gradation because of separate electronic parts with image pickup devices so that the patterns will be under a coaxial projection lighting and will fall within the same field of vision and by taking in such image data after converting the data into binary-coded ones for each pattern. CONSTITUTION:Image pickup devices 15 such as a lighting equipment 15a, an ITV camera, and the like are installed so that a conductive pattern 11a and an electrode pattern 13a of respective parts 11 and 13 or marks 11b and 13b will fall within the same field of vision. When a control part 17d judges that a liquid crystal display board 13 reaches a proper position, its part drives and controls the image pickup device and takes image patterns of a printed circuit board 11 and the liquid crystal display board 13 and their signals are converted through an A/D conversion circuit 16 in terms of bit and are stored into an image memory 17a. After respective image data are read out of the image memory, they are converted into binarycoded ones through the binary coded level which is set in advance with a binary coded circuit 17b, and further, both pattern positions are detected through the acquisition means of misregistration 17c and positioning control is performed so that the conductive pattern 11a of printed circuit board conforms to the electrode pattern 13a of the liquid crystal display board in terms of position.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an electronic component used for positioning when electrically connecting a conductive pattern on a printed circuit board and an electrode pattern on a liquid crystal display board, for example. This is related to the positioning 111tIl device, especially the positioning of electronic components that detects misalignment of Yukiko parts with high precision! 1 regarding the fil device.

(Prior Art) Generally, when electrically connecting a conductive pattern on a printed circuit board and an electrode pattern on a liquid crystal display board, after illuminating a predetermined part of the electronic component with an appropriate brightness using a lighting device,
The position of the pattern of the Yukiko Ame component is detected, and the amount of positional deviation is calculated from the positions of these two patterns to control the movement of the electronic component to a predetermined position.

By the way, in the past, several devices have been developed for controlling the positioning of electronic components as described above, based on differences in the illumination method, pattern position detection means, and the like.

One of them is a method in which an illumination device and an ITV camera are individually installed for each printed circuit board and liquid crystal display board to provide individual illumination and to individually detect pattern positions. Specifically, one illumination device is used to illuminate the conductive pattern on the printed circuit board using an oblique illumination method, and then one ITV camera is used to image the conductive pattern on the printed circuit board to detect the pattern position. Similarly, after illuminating the electrode pattern on the liquid crystal display board using the coaxial epi-illumination method using the other illumination device, the position of the electrode pattern is detected by mtaing the pattern on the liquid crystal display board using the other ITV camera. After that, the positional deviation is calculated from the positions of both patterns, and the X-Y table is driven and controlled based on this positional deviation amount to set either or both of the printed circuit board and the liquid crystal display board at an appropriate position. It is.

However, this electronic component positioning WJ device uses two ITV cameras to observe separate electronic component patterns, so it is necessary to adjust the positional relationship of the pattern image data obtained by imaging with the ITV cameras. This is necessary, and the complexity of the correction process cannot be denied.

The other method uses individual lighting devices for each printed circuit board and liquid crystal display board, and uses one ITV camera to detect the pattern position.

That is, after installing the ITV camera so that the conductive pattern on the printed circuit board and the electrode pattern on the liquid crystal display board are viewed within the same field of view, one illumination device is used to illuminate the conductive pattern on the printed circuit board using an oblique illumination method. Then, the electrode pattern of the liquid crystal display board is illuminated using the coaxial epi-illumination method using the other illumination device, the positions of both patterns are detected from the pattern image data taken by the ITV camera, and the positions of the two patterns are determined. Based on the amount of positional deviation
This configuration drives and controls the Y table.

This electronic component positioning control device uses two illumination devices to simultaneously illuminate the conductive pattern on the printed circuit board and the electrode pattern on the liquid crystal display board using different illumination methods, and uses a single ITV camera to image both patterns. Because there is
Due to differences in gradation reproducibility due to differences in the colors of each pattern, or differences in reflected light due to the combination of both front-brightness methods, the level of the image data captured by the ITV camera becomes extremely unstable. Even if the position is controlled based on the amount of positional deviation between the two patterns determined from this imaging level, the electronic component cannot be set at an appropriate position. To solve this 2
It is necessary to adjust the brightness of the two lighting devices, but the adjustment work is very complicated because the above effects differ depending on the initial setting position of each pattern.

(Problem to be Solved by the Invention) Therefore, the former device described above acquires pattern imaging data using two ITV cameras, and then
Because the image is captured by a V-camera, during data processing, the distance between the two ITV cameras is reduced by an amount equivalent to the installation interval, and the installation positions and directional relationships of the two ITV cameras are processed to determine the position of both patterns. Since it is necessary to calculate the amount of deviation, the amount of positional deviation correction often includes an error, and it is difficult to always reliably position the printed circuit board and the liquid crystal display board at appropriate positions.

On the other hand, the latter device requires complicated adjustment work, has poor positioning accuracy, and lacks reliability.

The present invention has been made in view of the above circumstances, and is capable of accurately detecting the pattern position of each electronic component in a stable state, and
It is an object of the present invention to provide a positioning control device for electronic components that can accurately obtain positional deviations of both patterns by simple data processing without adjusting a lighting device.

[Structure of the Invention] (Means for Solving the Problems) The electronic component positioning system tllll device according to the present invention includes the first and second electronic components in which patterns having mutually different gradations are formed. , a pattern imaging means for illuminating the patterns of both mold parts using a coaxial epi-illumination method, and setting eight imaging positions to image the patterns so that the patterns of both mold parts are desired within the same field of view; Then, the pattern imaged data captured by the imaging device is converted and captured at different binarization levels for each pattern of the first and second electronic components, and the pattern position of the pattern imaged data that has been binarized is determined. and a position deviation start acquisition means for determining the position deviation date of both patterns from the above.

(Function) Therefore, the present application, by taking the above means,
Both patterns with different gradations formed on the first electronic component and the second electronic component are illuminated by a coaxial falling illumination method using one illumination device, and one illumination device is used to illuminate the patterns with different gradations formed on the first electronic component and the second electronic component.
Set up several image processing devices and transport the image. In this state m
The pattern imaging data obtained by the imaging device is converted into a binary value using a different binary level for each pattern of each electronic component, and then imported, making it possible to detect the pattern position of each electronic component at a stable level. , and the position of the electronic component is controlled by accurately determining the amount of positional deviation from these pattern positions.

(Example of Fruit Eggplant) Hereinafter, an embodiment of the apparatus of the present invention will be described with reference to FIG. In the figure, reference numeral 11 denotes a printed circuit board as a first electronic component, and this printed circuit board 11 is set at a predetermined position by various conveyance means, one of which is a conveyance system 12 such as a belt conveyor. The printed circuit board 11 is used to transport one board at a predetermined interval and set it at a predetermined position.This printed circuit board 11 has a conductive pattern 11a for connection made of copper foil or the like formed at its end, and
A position detection mark 11b is formed at a location other than the conductive pattern 11a, such as a corner of the substrate.

This position detection mark 11b should generally be considered to be formed using the same material and in the same process as the connection conductive pattern 11a, and this is preferable from the viewpoint of work efficiency. Note that since either the connection conductive pattern 11a or the position detection mark 11b is used as the pattern position detection target, the term "pattern" here generally includes either of them.

On the other hand, for example, a liquid crystal display panel 13 as a second electronic component is a transport system 14 (for example, a robot) having an X-Y table.
will be installed in This liquid crystal display board 13 usually has an electrode pattern 13a formed of an ITO film.
! 'R extremely small turn 13 in places other than the cut pattern 13a
The tiL position inspection ratio detection mark 13b is formed at the same process step using the same forming means as a. However, the conductive pattern 11a of the printed circuit board 11 and the electrode pattern 13a of the liquid crystal display board 13 differ in color, pattern size, light quality, etc. depending on the material or manufacturing method. It is generally reproducible. Note that the pattern position detection target is the electrode pattern 13.
Either the pattern a or the position detection mark 13b is used, and similarly, when the pattern is collectively referred to as the pattern, either one is included.

Reference numeral 15 denotes a pattern R image means composed of an illumination device 15a, an image carrier 15b such as an ITV camera, and the like. In other words, this illumination '@ position 15a uses the coaxial epi-illumination method to detect the conductive pattern 11a1 of the printed circuit board 11, the position detection mark 11b, and the electrode pattern 13a9 of the liquid crystal display board 13.
A range including the position detection mark 13b and the like is irradiated. The imaging device 15b has a conductive pattern 11a and an electrode pattern 13a1 or a mark Ilb and a mark 13b within the same field of view.
are set up so that they fit together.

Reference numeral 16 denotes an A10 conversion circuit that converts the analog image signal obtained from the Ii imaging device 15b into digital imaging data, and the digital imaging data obtained here is sent to the data processing control section 17. This data processing control section 17 is
Image memory 17 that sequentially stores imaging data in a predetermined order
a, stored in this image memory 17a! A binarization circuit 17b converts l-image data into a binary signal at a binary level, and detects the pattern position of the printed circuit board 11 and the pattern position of the liquid crystal display board 13 from the output of this binarization conversion circuit 17b, and determines the positions of both patterns. A control unit 176 that controls the positional deviation acquisition means 17c that calculates the amount of positional deviation from and each component.
It is made up of etc. Note that the data processing control section 17 generally uses a microcomputer or a microprocessor to process data in a program-like manner.

Next, we will explain the operation of the positioning control device for electronic components configured as described above. First, when a start signal is generated periodically based on human or program data, as shown in FIG. The operation is performed based on a processing procedure, and at this time, the transport systems 12 and 14 are respectively transporting the printed circuit board 11 and the liquid crystal display board 13 in a predetermined direction while receiving Ill III commands from the control unit 17d. When the start signal is received in such a state, after performing an initialization process to clear unnecessary data (step S1), the control unit 17C performs a process to optimally identify the pattern position on the printed circuit board 11. A binarization level setting signal is output to set the binarization level of the binarization circuit 17b (step 82).After that, it is determined whether the printed circuit board 11 has reached a predetermined position (step 83). .

Incidentally, the arrival of the printed circuit board 11 at the predetermined position can be easily detected by various conventionally known technical means or from the mark 11b imaged by the imaging system MI5b.

Here, when it is determined that the printed circuit board 11 has reached the predetermined position, a drive control signal is output from the control section 17d to the @imaging device 15b. Imaging device 1 receives this drive control signal.
5b images the pattern of the printed circuit board 11 and the liquid crystal display board 13, and the sea signal is converted into digital data of a predetermined number of bits by the A10 conversion circuit 16 and stored in the image memory 17a.
(step 34). After that, image memory 1
After reading imaging data related to, for example, the printed circuit board 11 from 7a, the data is converted into binary data at a preset binary level using the binarization circuit 17b, and the pattern position of the printed circuit board 11 is detected (step 85). .

Subsequently, in the next step S6, the control unit 17d sends out a binarization level setting signal for optimally identifying the pattern on the liquid crystal display board 13, and sets the binarization level of the binarization circuit 17b (step 86). ). After that, the control unit 17 (step S7) determines whether or not the liquid crystal display board 13 has reached the proper position, and if it is determined that the liquid crystal display board 13 has reached the proper position, drives the imaging device 15b to 1. ．． IJ1
Similarly, the printed circuit board 11. The pattern of the liquid crystal display board 13 is N8! The image signal is transferred to the AID conversion circuit 16.
converts digital imaging data by bit conversion,
The image is stored in the image memory 17a (step 38). In addition,
The operation process in step s8 may be omitted since it has already been performed in step S4, but since the liquid crystal display board 13 may still be in the setting operation during the process in step S4, in this case, step The process of S8 cannot be omitted.

After that, after reading the Pi image data related to the liquid crystal display board 13 from the image memory 17a, the binarization circuit 17b is used to perform binarization conversion at a preset binarization level, and further, the position shift date is obtained. The pattern position on the liquid crystal display board 13 is detected by means 17c (step 39).

After obtaining the pattern position of the printed circuit board 11 and the pattern position of the liquid crystal display board 13 in step S9, step 510 continues to calculate the positional deviation of both patterns.
), if there is a positional deviation between the two patterns, a command is output from the control unit 17d and the liquid crystal display panel 1 is moved using the transport system 14, for example.
3 in a predetermined direction according to the positional deviation (step 511), and the conductive pattern 11a of the printed circuit board 11 is moved.
Control is performed so that the electrode pattern 13a of the liquid crystal display panel and the electrode pattern 13a of the liquid crystal display panel are aligned in position.

Therefore, according to the configuration of the embodiment as described above, one @imaging device is set in advance at a fixed position and the pattern of the imager part is imaged within the same field of view, so that two imaging devices are used. It is no longer necessary to process data such as positional relationships and directions as in conventional devices that use an imaging device. ! 1 element, and the positions of both patterns can be determined accurately. In addition, only the coaxial epi-illumination method was used to illuminate the patterns of the delimiter components, and the differences in gradation caused by each pattern were converted into binarization by changing the binarization level for each pattern. Therefore, as in the past, problems caused by the co-existence of light from the coaxial epi-illumination method and oblique illumination method, instability of the level of pattern AM data due to differences in pattern gradation, and inaccuracy of pattern position can be solved. be able to. Of course, the lighting equipment and! Each lil image device uses one unit and automatically changes the binarization level for each pattern to convert and import the lil image data, so the adjustment work required with conventional devices can be omitted, and it can be done online. A device that can be fully applied can be realized.

In the above embodiment, the conveyance system 12 for the printed circuit board 11 is a belt conveyor, and the conveyance system 14 for the liquid crystal display board 13 is an X
-Y table, but these may be of opposite configurations, or both transport systems 12, 14 may use XY tables. Further, it goes without saying that the electronic components are not limited to the printed circuit board 11 and the liquid crystal display board 13. Further, in the embodiment described above, the pattern position of the printed circuit board 11 was determined first, but the pattern position of the liquid crystal display board 13 may be determined first.

In addition, the present invention can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As detailed above, according to the present invention, coaxial epi-illumination is used, and an imaging device is set so that both patterns are viewed within the same field of view, and the pattern obtained with this imaging device is Since the pattern position is determined by converting the II image data into binary data at a different binary level for each pattern, the pattern position of each electronic component can be accurately detected in a stable state, eliminating the need to adjust the lighting equipment. , it is possible to provide an electronic component positioning device that can accurately obtain the amount of positional deviation of both patterns through simple data processing.

[Brief explanation of drawings]

Figures 1 and 2 show positioning control of electronic components according to the present invention! FIG. 1 is a block diagram of the apparatus of the present invention, and FIG. 2 is a flowchart for explaining the operation of the apparatus. 11... first electronic component (e.g. printed circuit board), 1
1a, 11b...Pattern, 13...Second electronic component (for example, liquid crystal display board), 13a, 13b...Pattern, 15...Pattern imaging means, 15a...Illuminating device, 15b...・Imaging device, 17...Data processing 1/
J tal1 copy, 17a...image memory, 17b...
...Binarization circuit, 17c... Position deviation mouth acquisition means, 1
7d...υ control section.

Claims (1)

[Claims] A first electronic component on which a predetermined pattern is formed, and a second electronic component on which a pattern with a different gradation from the pattern is formed.
pattern imaging means for illuminating each pattern of the electronic component using a coaxial epi-illumination method and imaging the pattern by setting an imaging device so that each pattern is viewed in the same field of view; a positional deviation amount obtaining means that converts and captures the pattern imaged data at a different binarization level for each pattern, and calculates the positional deviation amount of both patterns from the pattern position of each pattern imaged data subjected to the binarization conversion; , a control unit that variably controls the set position of one or both of the first and second electronic components based on the positional deviation amount acquired by the positional deviation amount acquisition means. positioning control device.