JPH0269609A - Method for inspecting taped parts - Google Patents

Abstract

PURPOSE:To perform a stable inspection on taped parts by irradiating one of adjacent parts with the light of one of paired light sources only, with the other of the adjacent parts being irradiated with transmissive light, and fetching and setting a single picture for inspection through the fetching routes of the reflected light and transmitted light from both parts. CONSTITUTION:A belt-like mount 4 which arranges and holds numerous parts 1, 1A, and 1B in one line and an inspection station S provided on the running path of a tape 5 are provided. Light sources 10 and 11 provided in parallel with each other in the running direction of the tape 5, etc., in the vicinity of the station S are turned on in a state where the light sources 10 and 11 are respectively made to correspond to one of the adjacent parts 1A and 1B only in accordance with the arranged state of the parts 1A and 1B. The other parts are irradiated with transmissive light and a single picture for inspection is fetched and set through fetching routes Xb2, Ya, etc., of the reflected light and transmitted light. Then the set picture for inspection being taken out and set is put on a window for picture processing preset in corresponding to each route Xb2, Ya, etc., and the parts 1A and 1B are decided in quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for inspecting a large number of parts held in a line by taping.

[Prior Art] Image processing has traditionally been used as a means of determining the quality of various parts.
After information collection and processing such as quantization and feature extraction of the captured image, the quality of the target part is determined by comparison with reference data. In inspection methods that use image processing, unnecessary parts are generally removed from the captured image, and for this purpose the area to be processed (
window) is set. A component inspection method using this window setting method is disclosed, for example, in Japanese Patent Laid-Open No. 60-27084, in which an image of the overall shape of the component captured by a camera installed near the component transport path is displayed in a preset window. The quality of the target part is determined by comparing the result of this superposition with reference data.

[Problems to be Solved by the Invention] When there are few inspection items for a part and it is possible to judge the quality of the part only by taking out an image of the entire shape, it is possible to use one camera and arm to inspect the part as in the conventional example. It is enough to extract the entire shape. However, for example, when loading electronic components into a device that automatically inserts electronic components into a printed circuit board, a large number of electronic components of the same type are held in a line with tape, so inspections for the presence of the tape and the electronic components themselves are performed. Due to the large number of items, it is not possible to obtain images necessary for all inspection items by capturing the overall shape using only one camera. Therefore, it is necessary to take out images of the target part from multiple directions using multiple cameras, which poses problems regarding the installation space and cost of the cameras. Moreover, if the arrangement direction of the parts to be inspected is reversed, a troublesome switching operation such as changing the installation position of the irradiation light source or camera is required in accordance with this change of orientation.

[Means for Solving the Problem] Therefore, the present invention targets parts that are aligned and held in a line by a holding tape, and a pair of adjacent parts that are sequentially transferred to the inspection station by the running of the holding tape from different directions. A pair of irradiating light sources are arranged in parallel in the running direction of the holding tape in a reflective area near the inspection station, and depending on the arrangement of the parts, lighting of either light source corresponds to only one of the adjacent parts. At the same time, the other side is made to correspond to transmitted illumination, and images for inspection of the grass are taken out and set through the extraction paths of reflected light and transmitted light from both parts, and image processing that is set in advance corresponding to each extraction path is performed. Information collection and processing for pass/fail judgment is performed based on the superposition of the inspection window and the inspection image set to be taken out.

[Operation] A pair of adjacent parts transferred to the inspection station receive irradiation light from the irradiation light source, and the reflected light from one part for the irradiation light and the transmitted light from the other part for the transmitted illumination take different paths from each other. A single inspection image is retrieved and set. The path of the reflected light can be set other than the direct reflection path from the target part, for example, by using a mirror, and a single inspection image can be set by setting such various paths. This allows multiple images related to each inspection item of the component to be easily retrieved as a single image regardless of the presence of the holding tape. Moreover, when the arrangement direction of the parts to be inspected is reversed, the image corresponding to the lighting of the other irradiation light source can be set as the inspection target, and by this target switching, the direction of the tape running direction relative to the inspection image can be set as the inspection target. An inverted inspection image is obtained. Therefore, 1
Efficient inspection can be achieved using only one camera without changing the light source or the installation position of the camera, and cost reductions can also be achieved.

[Example] Hereinafter, an example in which the present invention is embodied in a method for inspecting an electrolytic capacitor will be described based on the drawings.

As shown in Fig. 1.2, a pair of long and short polar lead wires 2 and 3 of a large number of electrolytic capacitors l are stuck and held on a strip-shaped mount 4 with tape 5 perpendicular to its longitudinal direction, and the electrolytic capacitors are The main body portions 6 of 1.1A and 1B extend to the sides perpendicular to the longitudinal direction of the tape 5 and are held aligned in a line. Each electrolytic capacitor 1.1A, 1A, 1B is held apart with a predetermined pitch p, and a strip mount 4 and a tape 5 are placed between each electrolytic capacitor I1A, 1A, 1B.
Positioning holes 7 are transparently provided between each electrolytic capacitor 1.1A, 1A, and 1B at a predetermined pitch p.

A large number of electrolytic capacitors1. The strip mount 4 and tape 5 that hold LA, 1A, and 1B aligned in a line are guided over a pair of adjacent transfer rollers 8.9, and positioning rollers are provided on the circumferential surfaces of both rollers 8.9. Positioning pins 8a and 9a that fit into the holes 7 are each formed with a groove. One of the transfer rollers 8 is a drive roller that performs intermittent feeding at a pitch p, and the strip-shaped mount 4 and tape 5 are intermittently transferred at a pitch p based on the fitting of the positioning pins 8a, 9a into the positioning holes 7.

A pair of lamps 10.11 are installed above an example of the strip mount 4 (on the main body 6 side of the electrolytic capacitors 1.LA, 1A, 1B) between the two transfer rollers 8, 9 so as to be able to illuminate the light downward. , both lamps 10.11 and electrolytic capacitor 1.1A,
A shielding plate 12 is interposed between the 18th column and the 18th column.
．． A slit 12a is provided at the bottom of the shielding plate 12. The slit 12a is set correspondingly between both lamps 10 and 11, and the irradiated light from one lamp 10 is transmitted from the front side (the running direction of the tape 5 is the front) through the slit 12a to the electrolytic capacitor 1. ．． I.A.

18 columns, and the irradiated light from the other lamp 11 passes through the slit 12a and is emitted from the rear elongation t to the electrolytic capacitor 1. LA, incident on the 18th column.

Capacitor 1.1A, 3rd lamp 1 directly below the 18th row
7 is installed facing both lamps io and it, lamp 17 and capacitors 1 and 18.

A screen 18 for dispersing light is interposed between the 18 rows. The irradiated light from the lamp 17 passes through the screen 18 i3 and heads upward.

Capacitor 1゜1A, 1 corresponding to both lamps 10.11
First and second mirrors 13 and 14 are installed approximately opposite each other on the 8th row, and a third mirror 15 is placed above the intermediate portion of both mirrors 13 and 14 so that the tape 5 travels along the running path. On the other hand, it is disposed facing downward with an inclination of approximately 45 degrees, and behind the third mirror 15, an image extraction camera 16 is disposed approximately parallel to the running direction of the tape 5. The first mirror 13 is the lamp 1
The second mirror 14 sends the reflected light from the electrolytic capacitors IA, which receives the irradiated light from the lamp 11, to the third mirror 15. 15, and the third mirror 15
The reflected light from the mirrors 13 and 14 and the irradiated light from the lamp 17 are reflected toward the camera 16. That is, the first and second
Between mirrors 13 and 14 are electrolytic capacitors 1.1A, 1A, 1
It is set as inspection station S of B, and both mirrors 1
314 is the distance between a pair of adjacent electrolytic capacitors LA, 1A
, 1B.

Inspection station S by intermittent feeding drive of transfer roller 8
Electrolytic capacitors 1゜1A, 1A, 1 are sent sequentially to
When B is arranged in an arrangement state in which the short negative polarity lead wire 3 is arranged on the advancing side as shown in FIGS. 1 and 2 (a) and (b), the electrolytic capacitor 1A sent into the inspection station S, 1B receives irradiation from the first lamp 10 in the inspection station run S.

The irradiated light from the first lamp 10 is transmitted from the slit 12a to the electrolytic capacitor 1A along the path represented by the arrow zb.
1B and reflected light from the area of the negative polarity mark 6a displayed in dark color on one side of the main body 6 of the electrolytic capacitors 1A and 1B to indicate the negative polarity lead cotton 3 is indicated by the arrow Y.
The image is taken into the camera 16 via the first mirror 13 and the third mirror 15 along a path represented by b.

The irradiated light from the third lamp 17 is transmitted through the screen 18 along the path represented by the arrow Xa 1, and this transmitted light Xa 1 is reflected from the mirror 15 to the path represented by the arrow Xa 2, and the camera 16 be taken into.

FIG. 2(c) is an image of the dot-dashed line area in FIG. 2(b) captured by the camera 16, where the area Di is the dark part of the main body 6 of the electrolytic capacitor 1 created by the transmitted light Xa, and the area D2 is the dark area of the main body 6 of the electrolytic capacitor 1. The dark area D3 of one polar lead wire 2 created by the transmitted light Xa is the dark area D3 of the other polar lead cotton 3 created by the transmitted light Xa.
Each represents the dark area that is the inversion of the reflected bright area. Also, area D
An area D4 on the right side of 1 represents a reflected image near the negative polarity mark 6a captured by reflection from the first mirror 13, and includes the peripheral surface of the main body 6 excluding the negative polarity mark 6a and the bipolar leads 2 and 3. is displayed as a bright area, and the negative polarity mark 6a is displayed as a dark area.

In this way, each input path Xal, Zb and extraction path
a2, image processing target area (window) for shape recognition corresponding to a single brightness image extracted via Yb
A plurality of values are set as shown by broken lines in FIG. 2(c). For setting the window, known means are used, for example, Japanese Patent Application Laid-Open No. 60-27
The setting method disclosed in Publication No. 084 is used. The window is an electrolytic capacitor 1. The inspection items are set according to the inspection items of LA, 1A, and 1B, and the inspection items include the inclination and height with respect to the strip mount 4 and tape 5, pinch deviation between parts, abnormal molding of the polar lead wire 2.3, and negative polarity mark. There are abnormalities in the position of 6a, type determination, presence or absence of parts, etc. The inclination is determined based on the overlapping of the window W1 and the area D1, and the height is determined based on the overlapping of the window W2 and the area DI. The pitch deviation is between window W1 and area DI, and between window W3 and area D.
2. D3, Wind W4. It is determined based on the overlapping of W6 and area D2 and the window W5° Wl and area D3, and the abnormality in the formation of the polar lead wire 2.3 is determined based on the overlapping of window W3 and area D2. D3, Wind W4. W6, area D2 and window W5. The determination is made based on each superposition of W7 and area D3.

Type determination is done using windows Wl, W2, area D1, and window W.
3. W4, area D2, window W3. W4, W5, area DI and window W3. This is done by superimposing W5 and area D3, and the presence or absence of parts is determined by window Wl, W2 and area DI, window ~v6, area D2, and window W7.
This is performed based on the superposition of the area D3 and the area D3. Further, the positional abnormality of the negative polarity mark 6a is determined based on the overlapping of the window W8 and the area D4.

Judgments are made based on a comparison between the data processed by the image processing system of the information obtained through superimposition and preset basic data, and the control system that performs this comparison makes a pass/fail judgment for the part to be inspected. The result will be output. If the part to be inspected is a good item, take out route Xa2. The relationship between the single inspection image obtained via Yb and the windows W1 to W8 is shown in FIG. 2(C).

Win l”W for determining the quality of such parts
Of the l-W8, the window W8 is set to correspond to the inspection of the negative polarity mark 6a taken out by installing the first mirror I3. , an electrolytic capacitor 1A in the position shown in (b),
1B.

In addition, the abnormality in the molding of the main body 6 and the bipolar lead wires 2 and 3 is caused by electrolytic capacitor I located at the positions shown in Fig. 2 (a) and (b).
It is done at A. That is, inspection of the position of the negative polarity mark 6a, inspection of the inclination and height of the main body 6, and abnormal formation of the polarity lead wires 2 and 3, which cannot be performed on a single image with a single irradiation light for a single electrolytic capacitor. Various inspections such as these can be made possible by performing transmitted illumination on electrolytic capacitor IA of a pair of adjacent electrolytic capacitors 1A, 1A, and 1B, and by using reflective illumination on electrolytic capacitors 1A and 1B. That is, in the external shape inspection, a clear image can be obtained by creating a silhouette using transmitted illumination, and in the negative polarity mark inspection, the reflected illumination through the slit 12a is performed without destroying the silhouette for external shape inspection.

Therefore, despite the large number of inspection items, it is possible to easily take out images of each part of the part to be inspected that are necessary for the inspection items with one camera 16 and perform stable inspection, and it is possible to perform stable inspection using multiple cameras. Problems with conventional inspection methods such as installation space and cost are resolved.

Figures 3(a), (b), and (c) show the arrangement orientation of electrolytic capacitors 1.1A, 1A, and 1B as shown in Figure 2(a).

(b) and (c) are the opposite cases, in which the short polarity lead wire 3 and the negative polarity mark 6a are arranged on the side opposite to the advancing side. In this arrangement state, the lamps 11 are lit, the irradiated light from the lamps 11 enters from the slit 12a of the shielding plate 12 along the incident path represented by the arrow Za, and the reflected light from the electrolytic capacitor IA is represented by the arrow Ya. The image is taken into the camera 16 along the extraction path.

Arrows Xbl and xb2 represent the irradiation light from the third lamp 17, and thereby the silhouettes of the electrolytic capacitors 1A and 1B are obtained. This extracted image (the elephant is shown in Figure 3 (c)
), the image in FIG. 2(c) is approximately horizontally reversed centering on the screen, and each area D1, D2, D3,
D4° is the area Di, D2D3 . Corresponds to D4. Then, a window Wl corresponding to the windows W1 to W8 is
', W2', W3'W4',W5', W6
', W7', and W8'' are set in the same way.In other words, the orientation of the electrolytic capacitors 1.1A, 1A, and 1B can be changed by simply switching the lighting of the lamps 10.11 and switching the window settings. There is no need to perform troublesome operations such as rearrangement of mirrors 13, 14, 15 or rearrangement of camera 16.

Of course, the present invention is not limited to the above-mentioned embodiments. For example, it is possible to use a concave mirror as a reflecting mirror. Adoption of a concave mirror makes it possible to set an enlarged image of a specific part necessary for inspection, and Accuracy can be increased. Alternatively, it is also possible to employ an optical fiber to set the extraction path for the reflected light, which makes it easier to set the extraction path.

Further, the present invention can also be applied to the inspection of electronic components other than electrolytic capacitors, and furthermore, components other than electronic components.

[Effects of the Invention] As described in detail above, the present invention allows a pair of adjacent parts transported to an inspection station by running a holding tape to be illuminated by one of a pair of light sources in accordance with the arrangement direction of the parts. Correspond only to one of the parts, and correspond to the other part with transmitted illumination, extract and set a single inspection image through the extraction path of reflected light and transmitted light from both parts,
Information collection and processing for pass/fail judgment is performed based on the superimposition of the window set in advance for each extraction route and the inspection image set for extraction, regardless of the presence of the holding tape. It is said that multiple images related to each inspection item of a part can be extracted as a single image without difficulty, and it can also easily handle changes in the arrangement orientation of inspected parts to achieve stable inspection and cost reduction. It has excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention; FIG. 1 is a perspective view showing the vicinity of the inspection station, FIG. 2(a) is a front view of the main part, FIG. 2(b) is a plan view, Figure (c) is a page area diagram showing the overlapping relationship between the retrieved and set image and the setting window, and Figures 3 (a), (b), and (c).
Figure 3(a) is a front view of the main parts, Figure 3(b) is a plan view, and Figure 3(c) shows the case where the arrangement direction of the electrolytic capacitors is reversed from that in Figure 2(a). ) is a region diagram showing the overlapping relationship between the extracted and set image and the setting window. Electrolytic capacitor 1.1A as taped component
, 1A, 1B, band-shaped mount 4 for taping parts
and tape 5, lamps 10 and 11 as light sources, inspection station S, and extraction path Xa.

Claims (1)

[Claims] 1. An inspection station (S) is set on the running path of the holding tape (4, 5) that holds a large number of parts (1, 1A, 1B) in a line, and A pair of light sources (10, 11) that irradiate a pair of adjacent parts (1A, 1B) sequentially transferred to the inspection station (S) from different directions are held by a tape in a reflective area near the inspection station (S). (4, 5) are arranged in parallel in the running direction, and depending on the arrangement state of the parts (1A, 1B), one of the two light sources (10, 11) is turned on to turn on the adjacent part (1
A, 1B), the other is made to correspond to transmitted illumination, and the extraction path (Xb_2, Ya or Xa_
2, Yb) and set a single inspection image via each extraction path (Xb_2, Ya or Xa_2, Yb
) The image processing window (W1
-W8, W1'-W8') and an inspection image that has been set to be taken out. A method for inspecting taped parts, characterized in that information collection and processing for quality determination are performed based on the superimposition of images for inspection that are set to be taken out.