JPH04188800A - Parts mounting device - Google Patents

Abstract

PURPOSE:To surely identify a lead, a terminal, or other marks, etc., by equipping it with an image pickup device, which picks up the object to be detected, and an identification means, which identifies each object to be detected based on investigating the interval between the fellow objects to be detected from the image information being gotten by this image pickup device. CONSTITUTION:When mounting the TAB part 11 carried to the vicinity of a liquid crystal cell 16, by a camera 20, the terminal row 15 part of the liquid crystal cell 16 and the lead row 12 part of the TAB part 11 are image, and by an image processor, for example, the center of the terminal row 15 and the center of the lead row 12 are detected, and from these, the quantity of relative slippage between both is calculated. And prior to the mounting work, the positions of the reference mark 30 as the object to be detected and the mark 31 are detected, and the image processor, by that software constitution, identifies these based on investigating the interval between the reference mark 30 and the mark 31. Hereby, the lead, the terminal, or other marks, etc., can be identified.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is based on T A B (Tape Automate
The present invention relates to a component mounting apparatus that automatically mounts electronic components such as d Bondjng components onto a board.

(Prior Art) In recent years, a component mounting apparatus has been provided that automatically mounts a TAB component, in which a TC chip is mounted on a carrier tape, onto a substrate such as a liquid crystal cell. As shown in FIG. 11, this device has a lead row 3 consisting of a plurality of leads 3a for a liquid crystal cell 2 which has a terminal row 1 on its periphery, which is constructed by arranging a plurality of terminals 1a in parallel. The TAB component 4 is mounted with each terminal]a and each lead 3a electrically connected to each other via an anisotropic conductive film 5.

Due to recent circumstances such as the narrowing of the lead 3a pitch of TAB parts 4, visual inspection using a CCD camera is required to accurately align the terminal row and lead row 3 during installation work. Component mounting devices incorporating recognition devices have been developed. As shown in FIG. 11, this visual recognition device removes the terminal row 1 part of the liquid crystal cell 2 and the lead row 3 part of the TAB part 4 when installing the TAB part 4 transferred to the vicinity of the liquid crystal cell 2. , CCD camera 7 with light source 6
For example, the center of the terminal row 1 and the center of the lead row 3 are determined by image processing, and the relative shift amount between the two is calculated from these. Then, based on this calculation result, for example, the TAB component 4 side is moved so that there is no deviation, positioning is performed, and then mounting is performed.

Further, the visual recognition device described above may also be used to correct the reference position of the liquid crystal cell 2 and to recognize the attachment position of the anisotropic conductive film 5. In this case, as shown in FIG. 12, the reference marks 8 of the liquid crystal cell 2 are formed so as to protrude in the orthogonal direction from the terminal a located at the end, for example, at the four corners of the liquid crystal cell 2. At the same time, a mark 9 for recognizing the attachment position is formed alongside this reference mark 8.

By photographing these with the camera 7 and determining their positions through image processing, the reference position of the liquid crystal cell 20 is corrected and the position where the anisotropic conductive film 5 is attached is recognized.

(Problem to be Solved by the Invention) However, when photographing the reference mark 8 for correcting the reference position of the liquid crystal cell 2 as described above, since the mark 9 is formed in the vicinity, the same camera 7 There will be two marks 8.9 of the same shape in the field of view,
In the conventional method, there was a risk that the mark 9 would be mistakenly recognized as the reference mark 8.

Further, as shown in FIG. 13, due to the manufacturing process, several pseudo electrodes 10 different from the terminals 1a may exist near the terminal row 1 of the liquid crystal cell 2. In such a case, even when the terminal row 1 is recognized by the visual recognition device, there is a risk that the pseudo electrode 10 will be determined to be the terminal 1a, and there is a problem that erroneous recognition may occur.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a component mounting apparatus that can reliably identify leads, terminals, or other marks.

[Configuration of the Invention (Means for Solving the Problems) The component mounting apparatus of the present invention includes a plurality of leads, terminals, or other marks arranged in parallel in order to align the lead row and the terminal row. and an identification means for identifying each detected object based on checking the distance between the detected objects from the captured image information obtained by the image capturing device. It has the following characteristics.

(Operation) According to the above means, each detected object is identified by the identification means from the photographed image information of the detected object photographed by the imager. In this case, multiple detected objects are identified by checking the distance between them, so even if multiple similar detected objects exist in close proximity, each detected object can be identified. This makes accurate identification possible.

(Example) Below, a first example in which the present invention is applied to a component mounting apparatus for mounting TAB components on a liquid crystal cell will be described in FIGS. 1 to 6.
This will be explained with reference to the figures.

First, to briefly describe the TAB component 11, as shown in FIG. 4 and FIG. It is configured by mounting an IC chip 14 thereon. A large number of TAB parts 11 are formed on a long carrier tape 13, and are separated into individual parts by punching, for example, and mounted. On the other hand, the liquid crystal cell 16, which is a substrate, has many terminals 1 on its edges.
A terminal row 15 consisting of TAB 5a is formed.
The component 11 has a lead row 12 on its negative side and the terminal row 1.
5 are attached in an electrically connected state through an anisotropic conductive film 17.

Here, the general structure of a component mounting apparatus for mounting the TAB component 1 on the liquid crystal cell 16 will be briefly described. Although not shown in detail, this component mounting apparatus includes a workbench on which the liquid crystal cell 16 is set in a positioned state on a base, a TAB component 11 supplied from a component supply section, which is acquired by suction, for example, and the liquid crystal cell 16 is mounted on the base. The apparatus is configured to include a mounting head for performing mounting work on the mounting head 16, a transfer device for transporting the mounting head in the X and Y directions, and the like. Then, the component supply unit pulls out the carrier tape 13 from the reel wound with the carrier tape 13 having a large number of TAB components 11, punches out the TAB components 11 from the carrier tape 13, and positions the punched TAB components 11. and is configured to feed the feed to the feed position. Each of the above mechanisms is
Control device 18 (first
(see figure) according to a predetermined program, so that the mounting work of the TAB component 11 is automatically performed.

The component mounting apparatus configured as described above is equipped with a visual recognition device for positioning the lead row 12 and the terminal row 15. The visual recognition device according to this embodiment will be described below.

As shown in FIG. 1, this visual recognition device includes a camera 20 with a light source 19 as an imager disposed near the workbench.
, an image processing device fiF 21 that processes image information from the camera 20, and a monitor 22 that displays images taken by the camera 20. The image processing device 21
is an A/D conversion circuit 23 that converts an image signal (analog signal) from the camera 20 into a multi-gradation digital signal;
An image memory 24 that stores the converted multi-gradation image signal, a D/A conversion circuit 25 that converts the multi-gradation digital signal into a video signal (analog signal) to the monitor 22, and executes control and processing. CPU 26, ROM 27 and RAM 28 in which programs and the like are stored, and the control device 18
The I 1029 interfaces with the I 1029.

Now, as shown in FIG. 6, in this embodiment, the liquid crystal cell 1
A reference mark 30 is formed at a predetermined position of 6 so as to protrude perpendicularly from the terminal 15a located at the end. A mark 31 is formed.

Although a detailed explanation will be omitted, the visual recognition device according to this embodiment, when mounting the TAB component 11 transferred to the vicinity of the liquid crystal cell 16, uses the camera 20 to detect the terminal row 15 portion of the liquid crystal cell 16 and the TAB component 11. A portion of the lead row 12 of the component 11 is photographed, and an image processing device 21 detects, for example, the center of the terminal row 15 and the center of the lead row 12, and from these, the relative shift amount between the two is calculated. In response to this result, the control device 18 moves, for example, the TAB component 11 to align the terminal row 15 and the lead row 12.

As will be described later, the visual recognition device detects the positions of the reference mark 30 and mark 31 as objects to be detected prior to the mounting operation. In this case, the image processing device 21 has the following software configuration:
The reference mark 30 and the mark 31 are identified based on checking the distance between them, and thus function as an identification means according to the present invention.

Next, the operation of the above configuration will be described.

When the liquid crystal cell 15 is set on the workbench, the position of the reference mark 30 is detected by a visual recognition device prior to the mounting work of the TAB component 11.

In this detection work, the reference mark 30 portion is photographed using the camera 20 (see screen 22 of the monitor 22 in Fig. 3), and based on the photographed image information, the image processing device 21 performs the processing shown in the flowchart of Fig. 2. It is done by being done. At this time, the RAM 28 of the image processing device 21 stores in advance the width a1 of the reference mark 30 and the mark 31 and the interval b between them (width of the base portion of the liquid crystal cell 16).

First, in step S1, a scan line L is set. As shown in FIG. 3, this scan line L is set to cross both the reference mark 30 and the mark 31 in the orthogonal direction. Here, that scan line L
The image level along the line becomes a high level at the reference mark 30 and the mark 31, and becomes an intermediate level at the ground part of the liquid crystal cell 16 (hereinafter referred to as "margin part"). Furthermore, when an anisotropic conductive film] 7 (shown with diagonal lines in FIG. 3 for convenience) is present on the liquid crystal cell 16, the reference mark 30 and mark 31 portions are at an intermediate level, and the margin portion is at an intermediate level. Becomes a low level. In this case, the position of the anisotropic conductive film 17 is shown in FIG. 3(a).

As distinguished in (b) and (c), a position outside the mark 31 (on the right side in the figure), a position where the edge covers a part of the mark 31, and a position where the edge is between the mark 31 and the reference mark 30. There are three possible positions: a position that reaches the margin of .

When scanning is performed sequentially from the left in FIG. 3 along the scan line L, first, a section of the margin part (previous margin) where the image level is at the intermediate level is detected (step S2
). Here, when the width of the section of the margin part is wider than the preset interval between the reference mark 30 and the mark 31 (No in step S3), it is recognized as the front margin, and this margin section is Assume that the position where the reference mark 30 ends is the starting position of the reference mark 30.

Then, in the next step S4, the reference mark 30 is detected. Here, a high-level image signal is continuously detected (a section is detected, and the width is determined by a reference mark 30 whose width is set in advance).
(NO in step S5), that section is assumed to be the reference mark 30 portion. Here, if the reference mark 30 portion cannot be detected (Yes in step S5), the process starts again from detecting the front margin.

In the next step S6, a margin section (back margin) between the reference mark 30 and the mark 31 is detected. Here, as shown in FIGS. 3(a) and (b), the next time a high image level area is detected, the low level (intermediate level) area is set as the rear margin area, and its width is When the distance between the reference mark 30 and the mark 31 is equal to 1 (Yes in step S8), the part assumed to be the reference mark 30 part is recognized as the reference mark 30 part, and this reference mark 300 The center position W) is calculated (step S9). On the other hand, as shown in FIG. 3(C), if the anisotropic conductive film 17 exists between the reference mark 30 and the mark 31, a lower level signal is obtained in the rear margin portion (step Y e at S7
s) At this time as well, the portion assumed to be the reference mark 30 portion is recognized as the reference mark 30 portion.

Note that if the rear margin section cannot be detected (No in step S8), the process starts again from the front margin detection.

In this way, it is possible to identify whether the portion assumed to be the reference mark 30 is truly the reference mark 30, based on checking the interval of the margin portion between the reference mark 30 and the mark 31. Therefore, even if a similar mark 3 exists near the reference mark 30, the reference mark 30 can be reliably identified.

In this embodiment, the reference mark 30 for correcting the position of the liquid crystal cell 16 and the mark 31 for recognizing the attachment position of the anisotropic conductive film 17 are identified, but the present invention is not limited to this.
For example, the reference mark 3o may be distinguished from other marks or wiring patterns similar to the reference mark 3o.

Next, regarding the second embodiment of the present invention, FIGS.
This will be explained with reference to the figures. In addition, Fig. 1, Fig. 4, Fig. 5
The configuration shown in the figure is also common to this example, so
New illustrations and detailed explanations will be omitted, and the same reference numerals will be used.

In this embodiment, as shown in FIG. 8, in the liquid crystal cell 16,
Two pseudo electrodes 32 as objects to be detected are formed near the terminal array 15, which is an object to be detected. In this case, the pseudo electrode 32 has the same shape (width) as the terminal 15a, and the margin width between the pseudo electrode 32 and the terminal 15a located at the end of the terminal row]5 is It is formed to be sufficiently wider than the width of the dirt floor 15a and the width of the pseudo electrode 32.

Now, the visual recognition device according to this embodiment uses the camera 20 to detect the terminal row 15 portion of the liquid crystal cell 16 and the TAB part 11 when the TAB component 11 transferred to the vicinity of the liquid crystal cell [6] is attached.
A portion of the lead row 12 of the B component 11 is photographed, and the image processing device 21 detects, for example, the center of the terminal row 15 and the center of the lead row 12, and from these, the relative shift amount between the two is calculated. At this time, the photographed image includes terminal row 15.
Although the pseudo electrode 32 is located near the image processing device 21, due to its software configuration,
The terminal row 15 and the pseudo electrode 32 are identified based on examining the distance between them. Detection of the center position of the terminal row 15 is performed according to the procedure shown in the flowchart of FIG. Note that at this time, the image processing device 2
In the RAM 28 of No. 1, the distance C1 between the terminals 15a and the pseudo electrodes 32 is the width d of the terminals 15a and the pseudo electrodes 32.
1 and the number of terminals 15a in the terminal row 15 are stored in advance.

First, in step S1.1, scan line L' is set. As shown in FIG. 8, this scan line L' is set to cross each terminal 15a and each pseudo electrode 32 in the orthogonal direction.

Although not shown, the image level along this scan line L' is at a high level at each terminal 15a and at each pseudo electrode 32 portion, and at a low level at a margin portion.

When scanning is performed sequentially from the left in FIG. 8 along the scan line L', first, a section of the margin portion where the image level is low is detected (step 512). Here, when the width of the section of the margin part is wider than the preset interval C between the terminals 15a and the same earth or the pseudo electrodes and the same earth (No at step 813), it is recognized as a margin section.

Then, in the next step S14, the first (leftmost) terminal 15a is detected. Here, when the width of the section where the high-level image signal continues is equal to the preset width d of the terminal 1.5a (NO in step S15), it is assumed that this is the leading terminal 15a. Here, first terminal 1
5a cannot be detected (Yes in step S15), the process starts again from detecting the margin section.

In the next step S16, the next terminal 15a is detected. This means that after a period in which a low-level image signal continues within a predetermined range (interval C), a high-level image signal continues in a predetermined period (interval C).
Width d) continues (No in step S17). Here, if the low-level image signal continues beyond the predetermined range (Yes in step S1.7), this section is considered to be a margin between the pseudo electrode 32 and the terminal row 15. Recognizing that what was previously assumed to be the terminal 15a was the pseudo electrode 32,
Start over from detecting the margin section again.

By repeating such detection of the terminals 15a, if a preset number of terminals 15a can be detected (step S1
8), all of them are recognized as terminals 15a, and the center position of the terminal row 15 is calculated in step S19.

With this, the distance between the terminals 15a and the terminal row 15
Based on examining the spacing of the margin part between
It is determined whether it is a. Therefore, terminal row 15
Even if similar pseudo electrodes 32 exist in the vicinity of the terminals 15a, each terminal 15a can be reliably identified.

Finally, a third embodiment of the present invention will be described with reference to FIGS. 9 and 10. The configurations shown in FIG. 1, FIG. 4, and FIG. 5 are also common to this embodiment, so new illustrations and detailed explanations will be omitted, and the same reference numerals will be used.

In this embodiment, as shown in FIG. 10, the terminals 15a of the terminal row 15 formed on the liquid crystal cell 16 are not of the same length, but are spaced apart from the third terminal from the left. The length is longer than the others. Here, long terminals are designated by the symbol r15bJ to distinguish them. Due to the manufacturing process, such terminal rows 15 with irregular lengths are often formed, and as shown in the figure, the scan line L1 crosses only the tip portions of the long terminals 15b. There are cases where you have to set it as follows.

Now, the visual recognition in the component mounting apparatus according to the present embodiment corresponds to such a case, and the terminal row 15 and the lead row 12 are
The position detection (detection of relative displacement between the two) is performed, and specifically, the process is executed according to the procedure shown in the flowchart of FIG.

That is, first, in step S21, an image signal from the camera 20 is taken into the image processing device 21. Next step S2
2, the terminal pitch Pi (see FIG. 10) on the terminal row 15 side and the number of detections (how many terminals 15b to be detected from the left) are set. Here, the terminal pitch P is the original pitch P between the terminals 15a. instead of scan line L
1, that is, the pitch between adjacent terminals 15b. The number of detected terminals determines how many terminals 15b are detected to determine the relative position. For example, two terminals (the first
0 (distinguished by diagonal lines in the figure).

Then, in step 523, the pitch P2 of the leads 12a of the lead row 12 of the TAB component 11 is set (this pitch P2 is equal to the above-mentioned P.). Part 1
The number of detected leads 12a on the lead row 12 side of 1 is set. As shown in FIG. 10, this number of detected leads is determined based on how many leads 12g must be detected from the left to correspond to the center position 02 of the terminal 15b in the number of detected leads. Here, seven lines are set as indicated by diagonal lines in the figure.

Next, in step S24, the scan line L2 on the lead row 12 side is set, and in step S25, the position of this lead row 12 is detected. Although a detailed explanation will be omitted, this position detection is performed in substantially the same manner as in the second embodiment, and when seven leads 12a are detected from the left, their average position (center position 1102) is detected. is calculated. In this case as well, by checking the distance between leads 12a and 12a, lead 2a can be accurately identified and its position detected.

Then, when this center position 02 is detected (step S
26), then the scan line L1 on the terminal row 15 side is set (step 527), and then the average position (center position 0,) of the two terminals 15b is set as the lead 1.
2a is detected (step 828). At this time as well, the position of the terminal 1.5b is accurately detected based on checking the distance between the terminals 15b and the ground. This center position is 0. is detected (step S2
9), and in step S30, center positions O3 and 0
The amount of deviation from 2 is calculated. Based on this, the positional deviation is corrected, and as a result, T
The AB component 11 is to be installed.

In the above embodiment, the first terminal from the third from the left in the terminal row 15
A specific example has been described in which long terminals 15b are detected every other book, but if this is converted into a film, the result will be as follows.

That is, Pt: pitch of the terminals of the liquid crystal cell and leads of the TAB component Pl: pitch of the terminals in the scan line of the liquid crystal cell d: pitch of the terminals in the scan line of the liquid crystal cell (
PI-PtXd, Nl: Number of detection terminals in the scan line of the liquid crystal cell LO: Position of the leftmost terminal of the liquid crystal cell Ls: First position of the long terminal of the liquid crystal cell C1: Liquid crystal If the detected average position of the cell terminal is I-Lo+LsXPt+PIX(Nl-1)/2.

On the other hand, if Nt: number of detected leads of TAB components Lt: position of leftmost lead of TAB components Ct: average detected position of leads of TAB components, then Ct-Lt×Ptx (Nl-1)/2, so L
By setting the number of detected leads Nt of the TAB component when omLt, C15=Ct as Nt=2XLs+dX (Nl-1)+1, the same process as in the above embodiment can be performed.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be applied not only to the liquid crystal cell 16 but also to any electronic component such as a printed wiring board. The present invention may be modified and implemented as appropriate without departing from the gist of the invention.

[Effects of the Invention] As is clear from the above description, the component mounting apparatus of the present invention includes an imager that photographs a portion of an object to be detected, and a photographic image information obtained by the imager that identifies the object to be detected. Since an identification means for identifying each detected object based on checking the interval between them is provided, it has an excellent effect of making it possible to reliably identify leads, terminals, or other marks. It is.

[Brief explanation of drawings]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a diagram schematically showing the overall configuration, FIG. 2 is a flowchart showing the procedure for detecting a reference mark, and FIG. Diagram (a)
, (b) and (c) are views showing the monitor screens with the anisotropic conductive film in different positions and the corresponding image levels side by side, FIG. 4 is an enlarged perspective view of the main part, and FIG. 5 6 is a vertical sectional view showing how the TAB parts are attached to the liquid crystal cell, and FIG. 6 is an enlarged plan view of the main parts of the liquid crystal cell. 7 and 8 show a second embodiment of the present invention, and FIG.
The figure is a flowchart showing the procedure for terminal position detection, and FIG. 8 is a diagram corresponding to FIG. 6. 9 and 10 show a third embodiment of the present invention, and FIG. 9 is a flowchart showing the procedure for detecting misalignment between the terminal row and the lead row,
FIG. 0 is a partially enlarged plan view of a liquid crystal cell and TAB components. Furthermore, FIGS. 11 to 13 show conventional examples,
11 is a diagram equivalent to FIG. 4, FIG. 12 is a diagram equivalent to FIG. 6, and FIG. 13 is a diagram equivalent to FIG. 8. In the drawing, 11 is a TAB component (electronic component), 12 is a lead row, 12a is a lead (detected object), 15 is a terminal row, 15
a and 15b are terminals (objects to be detected), 16 is a liquid crystal cell (substrate), 17 is an anisotropic conductive film, 18 is a control device, 20 is a camera (imaging device), 21 is an image processing device (identification means), 2
2 is a monitor, 23 is an A/D conversion circuit, 24 is an image memory, 25 is a D/A conversion circuit, 26 is a CPU, and 27 is a ROM
. 28 is a RAM, 29 is Ilo, 30 is a reference mark (object to be detected), 31 is a mark (object to be detected), 32 is a pseudo-polarized electrode (
(object to be detected). Agent Patent Attorney Tsuyoshi Sato Figure 1 Figure 8 Figure 9 [jU

Claims (1)

[Claims] 1. In a component mounting apparatus that mounts an electronic component having a lead row on a board on which a terminal row is formed so that the lead row and the terminal row are connected, for positioning the lead row and the terminal row. An imager that photographs an object to be detected in which a plurality of leads, terminals, or other marks are arranged in parallel, and a distance between the objects to be detected is determined from image information obtained by this imager. What is claimed is: 1. A component mounting apparatus comprising: identification means for identifying each object to be detected based on.