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Browse Prior Art Database

Orthogonal Intersecting Light Beam Position Locater

IP.com Disclosure Number: IPCOM000060834D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Gobran, FS: AUTHOR [+4]

Abstract

In the manufacture of printed circuit boards (PCBs) various inspections are made to ascertain if defects in the circuitry exist. If defects are discovered, their location must be either marked or recorded so that the defect location can be easily found in a subsequent repair operation. A method of recording the X-Y coordinates of a defect without physically contacting or marking the PCB is accomplished in a system that locates the defect using an image processing system and enters the X-Y coordinates into adata base. At the repair test station the defect coordinates are recalled from the data base and converted to intersecting light beams to locate the defect. The PCB 1 to be repaired or tested is placed on an X-Y frame 2, as seen in the side view of the drawing.

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Orthogonal Intersecting Light Beam Position Locater

In the manufacture of printed circuit boards (PCBs) various inspections are made to ascertain if defects in the circuitry exist. If defects are discovered, their location must be either marked or recorded so that the defect location can be easily found in a subsequent repair operation. A method of recording the X-Y coordinates of a defect without physically contacting or marking the PCB is accomplished in a system that locates the defect using an image processing system and enters the X-Y coordinates into adata base. At the repair test station the defect coordinates are recalled from the data base and converted to intersecting light beams to locate the defect. The PCB 1 to be repaired or tested is placed on an X-Y frame 2, as seen in the side view of the drawing. The X-Y coordinates of the defect are found on increment scales 3 on the sides of X-Y frame 2. Sliders 4 move on tracks 5 until sliders 4 are at appropriate X-Y coordinates on increment scales 3. Light emanating from light source 6 (top view) passes through fiber-optic bundles 7 that are secured to sliders 4 which move along tracks 5. The light beams 8 intersect over defect 9. The light beams are narrow beam and intersect within a 0.04 square inch window for the precise location of a defect. The device can also be used to locate defects for the purpose of entering information into a data base.

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