COMPONENT PRESENCE/ABSENCE JUDGING APPARATUS AND METHOD

• US 20120020545A1
• Filed: 07/06/2011
• Published: 01/26/2012
• Est. Priority Date: 07/21/2010
• Status: Active Grant

• Current Assignee: Fuji Company Limited
• Original Assignee: Fuji Machine Manufacturing Company Limited
• Inventors: OIKE, Hiroshi, Inagaki, Mitsutaka
• Granted Patent: US 8,699,782 B2
• Time in Patent Office: Days
• US Class Current: 382/141
• CPC Class Codes: G06T 2207/10024 Color image
• CPC Class Codes: G06T 2207/20081 Training; Learning
• CPC Class Codes: G06T 2207/30141 Printed circuit board [PCB]
• CPC Class Codes: G06T 7/0008 checking presence/absence
• CPC Class Codes: G06V 2201/06 Recognition of objects for industrial automation
• CPC Class Codes: H05K 13/0815 Controlling of component placement on the substrate during or after manufacturing
• CPC Class Codes: H05K 3/341 Surface mounted components

Abstract

A component presence/absence judging apparatus judges the presence/absence of components through a registration step and an inspection step. The registration step includes an ante-mounting feature acquisition step, a post-mounting feature acquisition step and a classifier configuration step. At the ante-mounting and post-mounting feature acquisition steps, ante-mounting features and post-mounting features are respectively acquired from an ante-mounting image and a post-mounting image taken at each of predetermined places on an ante-mounting board and a post-mounting board. At the classifier configuration step, a classifier is configured by registering the ante-mounting features and the post-mounting features as training data to a support vector machine. Then, at the inspection step, the presence/absence of a component at each of the predetermined places on each post-mounting operation board to be inspected is judged by inputting post-mounting operation features acquired from each of the predetermined places on each post-mounting operation board to the support vector machine configured as the classifier.

Claims

1. A component presence/absence judging apparatus for judging whether or not components are mounted at predetermined places on a board after component mounting operations which mount the components on the board, the apparatus comprising:

an image pickup device for relatively moving the board and a camera to pickup images of the predetermined places on the board;

ante-mounting feature acquisition means for acquiring at least brightness information as ante-mounting features from an ante-mounting image which the image pickup device picks up at each of the predetermined places on an ante-mounting board before mounting the components at the predetermined places thereon;

post-mounting feature acquisition means for acquiring at least brightness information as post-mounting features from a post-mounting image which the image pickup device picks up at each of the predetermined places on a post-mounting board after mounting the components at the predetermined places thereon;

classifier configuration means for configuring a classifier by registering the ante-mounting features and the post-mounting features in a support vector machine;

post-mounting operation feature acquisition means for acquiring at least brightness information as post-mounting operation features from a post-mounting operation image which the image pickup device picks up at each of the predetermined places on an inspection board after mounting the components at the predetermined places thereon;

input means for inputting the post-mounting operation features to the support vector machine configured as the classifier; and

judgment means for judging whether or not a component is mounted at each of the predetermined places on the inspection board, by the support vector machine configured as the classifier.

2. The component presence/absence judging apparatus as set forth in claim 1, wherein the brightness information includes the highest brightness and the lowest brightness on an inspection area image which is made by extracting a predetermined area from each of the images picked up, brightness at a boundary portion of each of electrode areas acquired from each of the images picked up, and brightness at a center portion between the electrode areas.

3. The component presence/absence judging apparatus as set forth in claim 2, wherein each of the brightness information on the boundary portion of each of the electrode areas and the brightness information on the center portion between the electrode areas includes brightness relating to red light, green light and blue light.

4. The component presence/absence judging apparatus as set forth in claim 3, wherein the image pickup device has oblique illumination light sources for throwing lights toward the board from obliquely above and picks up each of the predetermined places with the oblique illumination light sources throwing the lights toward the board.

5. The component presence/absence judging apparatus as set forth in claim 1, wherein the ante-mounting feature acquisition means, the post-mounting feature acquisition means and the post-mounting operation feature acquisition means respectively acquire, in addition to the brightness information, respective area information relating to each of the electrode areas acquired from the ante-mounting image, the post-mounting image and the post-mounting operation image as the ante-mounting features, the post-mounting features and the post-mounting operation features.

6. The component presence/absence judging apparatus as set forth in claim 5, wherein the brightness information includes a square measure of each of the electrode areas and a major axis length and a minor axis length of an ellipse equivalent to each of the electrode areas.

7. A component presence/absence judging method for judging whether or not components are mounted at predetermined places on a board after component mounting operations which mount the components on the board, the method comprising:

an ante-mounting feature acquisition step of acquiring at least brightness information as ante-mounting features from an ante-mounting image which an image pickup device picks up at each of the predetermined places on an ante-mounting board before mounting the components at the predetermined places thereon;

a post-mounting feature acquisition step of acquiring at least brightness information as post-mounting features from a post-mounting image which the image pickup device picks up at each of the predetermined places on a post-mounting board after mounting the components at the predetermined places thereon;

a classifier configuration step of configuring a classifier by registering the ante-mounting features and the post-mounting features in a support vector machine;

a post-mounting operation feature acquisition step of acquiring at least brightness information as post-mounting operation features from a post-mounting operation image which the image pickup device picks up at each of the predetermined places on an inspection board after mounting the components at the predetermined places thereon;

an input step of inputting the post-mounting operation features to the support vector machine configured as the classifier; and

a judgment step of judging whether or not a component is mounted at each of the predetermined places on the inspection board, by the support vector machine configured as the classifier.

8. The component presence/absence judging method as set forth in claim 7, wherein the brightness information includes the highest brightness and the lowest brightness on an inspection area image which is made by extracting a predetermined area from each of the images picked up, brightness at a boundary portion of each of electrode areas acquired from each of the images picked up, and brightness at a center portion between the electrode areas.

9. The component presence/absence judging method as set forth in claim 7, wherein the ante-mounting feature acquisition step, the post-mounting feature acquisition step and the post-mounting operation feature acquisition step are executed to respectively acquire, in addition to the brightness information, respective area information relating to each of the electrode areas acquired from the ante-mounting image, the post-mounting image and the post-mounting operation image as the ante-mounting features, the post-mounting features and the post-mounting operation features.

10. The component presence/absence judging method as set forth in claim 9, wherein the brightness information includes a square measure of each of the electrode areas and a major axis length and a minor axis length of an ellipse equivalent to each of the electrode areas.