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Patent Searching and Data


Title:
PATTERNED ILLUMINATION METHOD AND APPARATUS FOR MACHINE VISION SYSTEMS
Document Type and Number:
WIPO Patent Application WO2004001285
Kind Code:
A3
Abstract:
This application relates to an apparatus (Fig. 3) and method for providing patterned illumination fields for use within process control and article inspection applications. More specifically, it pertains to the use of patterned illuminators (90, 110) to enable visual surface inspection of polished objects (30)such as ball bearings. The use of patterned illuminators properly disposed in relation to a polished part under inspection allows small surface imperfections such as scratches and pits to become visible against the normal surface background. The use of carefully engineered illuminators facilitates advantageous defect-site scattering from generally dark field sources. The patterned nature of the illuminators defined by this invention allows the complete surface (55) of three-dimensional parts to be effectively highlighted using dark field illumination fields.

Inventors:
COCHRAN DON W (US)
CECH STEVEN D (US)
PALOMBO THOMAS H (US)
YODER MICHAEL L (US)
BOOHER JESSE (US)
GRAVES TERRY L (US)
Application Number:
PCT/US2003/019580
Publication Date:
April 29, 2004
Filing Date:
June 20, 2003
Export Citation:
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Assignee:
PRESSCO TECH INC (US)
COCHRAN DON W (US)
CECH STEVEN D (US)
PALOMBO THOMAS H (US)
YODER MICHAEL L (US)
BOOHER JESSE (US)
GRAVES TERRY L (US)
International Classes:
G01N21/00; G01N21/88; G01V8/00; G06M7/00; G08B13/18; G01N21/84; H01J40/14; F21V; (IPC1-7): G06M7/00; H01J40/14; G01V8/00; G01N21/00; G01N21/84; G08B13/18
Foreign References:
US6207946B12001-03-27
US6359694B12002-03-19
US6256091B12001-07-03
US5943125A1999-08-24
US6118524A2000-09-12
US5909285A1999-06-01
US4893223A1990-01-09
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