NDLI: Noncontact Bent Pin Detection Using Laser Diffraction

Content Provider	IEEE Xplore Digital Library
Author	Voyles Jr., R.
Copyright Year	1978
Abstract	The use of optical diffraction is investigated to detect bent pins on a high-density multi-chip integrated-circuit module as an intermediate step in a robotic assembly process. A fixed laser beam shines on a fixed optical array while the robot moves the pins of the module through the beam at four different orientations. (While two scans are mathematically adequate, four scans are required because of the physical characteristics of this particular module.) The optical array is continuously scanned and the resultant images are processed to detect specific abnormalities in the diffraction pattern. If a flaw is detected, software determines the approximate location of the defective pin and whether it should be straightened manually or sent back for rework (determined by the angle of bend).
Sponsorship	IEEE Electronic Industries Alliance American Society of Mechanical Engineering (ASME) NBS SAE
Starting Page	458
Ending Page	463
Page Count	6
File Size	731347
File Format	PDF
ISSN	01486411
Volume Number	9
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1986-12-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical diffraction Pins Robotic assembly Optical arrays Laser beams Optical sensors Humans Sockets Laser theory Robots
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Electronic, Optical and Magnetic Materials Engineering Electrical and Electronic Engineering

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