Browse Prior Art Database

IMPROVED ILLUMINATION FOR VISION SYSTEM

IP.com Disclosure Number: IPCOM000007229D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2002-Mar-06
Document File: 2 page(s) / 75K

Publishing Venue

Motorola

Related People

Neil Williams: AUTHOR [+2]

Abstract

This structure provides external and indirect illu- mination in a spatially restrictive environment. Light is transmitted through a fiber-optic bundle (1) to a uniquely designed quartz lens (2) below the surface of the objective lens (3) and at an angle that inter- sects the surface ofthe die (4). This eliminates spec- ular light from reflecting back into the camera lens. This structure is tolerant of die surfaces (4) with poor contrast, irregular surface textures and other non-uniformity which may cause a wide variety of quality variation from one image to the next.

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MO-LA Technical Developments Volume 22 June 1994

IMPROVED ILLUMINATION FOR VISION SYSTEM

by Neil Williams and Walt Hayes

  This structure provides external and indirect illu- mination in a spatially restrictive environment. Light is transmitted through a fiber-optic bundle (1) to a uniquely designed quartz lens (2) below the surface of the objective lens (3) and at an angle that inter- sects the surface ofthe die (4). This eliminates spec- ular light from reflecting back into the camera lens. This structure is tolerant of die surfaces (4) with poor contrast, irregular surface textures and other non-uniformity which may cause a wide variety of quality variation from one image to the next.

  This invention significantly improves the reso- lution and contrast of the image which facilitates fast and reliable pattern recognition not attainable with the existing lighting system. The advantages are improved contrast for more reliable pattern rec- ognition and reduced recognition time. It also offers

a low cost alternative to image-enhancing cameras and software.

This illumination system can potentially be used on any vision system requirement.

  See Figure 1 and 2~ for further details on how the new vision system enhances the lighting on the die surface. Rough surfaces, like aluminum oxide, will diffuse the light and part of this light falls on the lens. These areas will appear bright on the mon- itor. Smooth surfaces, like silicon oxide, mirrors the light and no light wi...