Lens inspection system and method

Details Lens inspection system and method Lens inspection system and method

1994-06-10

1996-03-19

Pham, Hoa Q.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

G01B 900

Patent

active

055007325

ABSTRACT:
A system and method for inspecting ophthalmic lenses. The system comprises a transport subsystem for moving the lenses into an inspection position, and an illumination subsystem to generate a light beam and to direct the light beam through the lenses. The system further comprises an imaging subsystem to generate a set of signals representing selected portions of the light beam transmitted through the lenses, and a processing subsystem to process those signals according to a predetermined program. The illumination subsystem includes a light source to generate a light beam and a diffuser to form that light beam with a generally uniform intensity across the transverse cross section of the light beam. The illumination subsystem further includes a lens assembly to focus a portion of the light beam onto an image plane, and to focus a portion of the light beam onto a focal point in front of the image plane to form a diffuser background pattern on the image plane.

REFERENCES:
patent: 3770969 (1973-11-01), Ansevin et al.
patent: 3822096 (1974-07-01), Wilms et al.
patent: 4002823 (1977-01-01), Van Oosterhout
patent: 4691231 (1987-09-01), Fitzmorris et al.
patent: 5080839 (1992-01-01), Kindt-Larsen

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