Coaxial narrow angle dark field lighting

Details Coaxial narrow angle dark field lighting Coaxial narrow angle dark field lighting

2005-03-22

2005-03-22

Mehta, Bhavesh M. (Department: 2625)

Image analysis

Applications

Manufacturing or product inspection

C382S141000, C356S237300, C356S237400, C356S600000, C356S446000

Reexamination Certificate

active

06870949

ABSTRACT:
A coaxial narrow angle dark field imaging system is provided. The system utilizes a telecentric lens to illuminate objects with symmetric coaxial narrow angle dark field illumination. The illumination technique is particularly suited to highlight minor features or defects on planar specular objects. In particular, the coaxial light source directs light rays towards a telecentric lens which redirects the light rays towards the substantially planar specular object. The light rays are reflected back through the telecentric lens towards a camera. To the extent that the light rays are reflected from a planar specular portion of the object the light rays are blocked by a telecentric stop. Light rays reflected from a defect or feature in the planar specular object will pass through an aperture in the stop to a camera.

REFERENCES:
patent: 5231536 (1993-07-01), Wilt et al.
patent: 5377001 (1994-12-01), Malin et al.
patent: 5469294 (1995-11-01), Wilt et al.
patent: 5737122 (1998-04-01), Wilt et al.
patent: 6445812 (2002-09-01), Lai et al.
patent: 20020009218 (2002-01-01), Chapman et al.
patent: 20020037105 (2002-03-01), Michael
patent: 20020113970 (2002-08-01), Baldwin et al.
patent: 20030009242 (2003-01-01), Bocchi
patent: 20030025918 (2003-02-01), Watkins et al.
patent: 20030202178 (2003-10-01), Tsuji et al.

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