Browse Prior Art Database

Closed-Loop Surface Mount Device Imaging System

IP.com Disclosure Number: IPCOM000035052D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Bleau, CD: AUTHOR [+5]

Abstract

This article describes an imaging system for alignment of surface mount component (SMC) leads/pads to printed circuit board or glass substrate lands utilizing a borescope to reduce optical complexity. The imaging system disclosed herein provides a means for accomplishing high accuracy closed-loop alignment of surface mount component leads and printed circuit lands prior to placement. Fig. 1 is a side view of the apparatus utilized in a robotic end-of-arm tooling. In operation a vacuum pickup head 1 picks a SMC 2 from a feed device (not shown). The robot moves the SMC to a preprogrammed location roughly over the placement site 3.

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Closed-Loop Surface Mount Device Imaging System

This article describes an imaging system for alignment of surface mount component (SMC) leads/pads to printed circuit board or glass substrate lands utilizing a borescope to reduce optical complexity. The imaging system disclosed herein provides a means for accomplishing high accuracy closed-loop alignment of surface mount component leads and printed circuit lands prior to placement. Fig. 1 is a side view of the apparatus utilized in a robotic end-of-arm tooling. In operation a vacuum pickup head 1 picks a SMC 2 from a feed device (not shown). The robot moves the SMC to a preprogrammed location roughly over the placement site 3. Borescope 4, using a light source (not

(Image Omitted)

shown) and a fiber-optic light path 5, composed of lenses 6, and right angle mirrors 7 and 8, is located such that mirror 7 is positioned directly under the SMC. The machine vision system and fiber-optic light source are turned on. The SMC is illuminated and an image is projected via mirror 7, lens 6, and mirror 8 through camera lens 10 to a camera's charge coupled device (CCD) array. The vision system processes as the information and the SMC location, relative to the camera CCD array, is stored. Borescope rotate motor 11 is turned on and borescope 4 is rotated 180o from its home stop position to a machined stop position. An image of the placement site is taken and processed by the vision system. The location of the site image and the SM...