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Browse Prior Art Database

Method for Inspecting Lead Pin Insertion Into Card Through-Holes

IP.com Disclosure Number: IPCOM000039626D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Tsukamoto, K: AUTHOR

Abstract

Cards are inspected to check whether lead pins of components have been properly inserted into through-holes of the cards. After assembly of the components, the backside of the card is scanned by a video camera and its image is digitized. The digital image of each through-hole area is then analyzed by spiral scan starting from the center of the through-hole. If a lead pin is properly inserted, the spiral scan will find a white pel region before reaching a preset end point. The spiral scan is efficient to analyze the digital image for detection of a lead pin inserted into the through-hole. Fig. 1 illustrates images for two states: a correct state (Fig. 1A), where the through-hole 10 has a lead pin 20 properly inserted therein and an incorrect state (Fig.

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Method for Inspecting Lead Pin Insertion Into Card Through-Holes

Cards are inspected to check whether lead pins of components have been properly inserted into through-holes of the cards. After assembly of the components, the backside of the card is scanned by a video camera and its image is digitized. The digital image of each through-hole area is then analyzed by spiral scan starting from the center of the through-hole. If a lead pin is properly inserted, the spiral scan will find a white pel region before reaching a preset end point. The spiral scan is efficient to analyze the digital image for detection of a lead pin inserted into the through-hole. Fig. 1 illustrates images for two states: a correct state (Fig. 1A), where the through-hole 10 has a lead pin 20 properly inserted therein and an incorrect state (Fig. 1B), where the lead pin has not been inserted because of some defect, and thus the through-hole 10 is empty. If the lead pin 20 is properly inserted to extend to the backside of the card, the lead pin 20 will be detected as a white region in a black through-hole, as viewed from the backside of the card. The digitized image of each through- hole area is scanned in a spiral fashion, as shown in Fig. 2. The spiral scan starts from the center of the through-hole until it encounters a white pel. When this occurs, the program sets a window of a predetermined size, e.g., 3 x 3 pels, having the detected white pel as its origin, and determines whether all the...