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US 6,552,783 B1Granted
Optical system
AssigneeTeradyne, Inc.
InventorsPeter E. Schmidt, Pamela R. Lipson, John C. Bowman
Life of this patent
Estimating the term…
Abstract
An optical system for use in an inspection system is described. The optical system includes an imaging system which may be provided as a multi-spectral band pass image recording system and a lighting system which includes at least one coaxial light and at least one side light to provide spectral discrimination and to provide contrast between a first surface made from a first material and a second surface made from a second different material.
Claims40
A system for inspecting an object, the system comprising:
- (a) an imaging system having a field of view coincident with the object;
- and
- (b) a lighting system disposed about said imaging system, said lighting system including:
- (1) a first light source for providing in the field of view a first diffuse light having a first spectral distribution, the first diffuse light provided along an optical path coincident with an optical axis of said imaging system;
- and
- (2) one or more second light sources disposed about the object, each of said one or more second light sources substantially uniformly distributed rotationally about the optical axis and each of said second light sources for providing a second diffuse light which is substantially uniform in the field of view, each of said one or more second light sources disposed to provide the second diffuse light along optical paths which are at a predetermined angle with respect to the optical axis of said imaging system and having a second spectral distribution which is different from the first spectral distribution, and wherein the light provided by the first light source is more diffuse than the light provided by the one or more second light sources.
3 more elements
An optical system for inspecting a printed circuit board, the system comprising:
- (a) a multi-spectral imaging system including:
- (1) a multi-spectral camera having an optical axis;
- and
- (2) a telecentric lens coupled to said multi-spectral camera;
- and
- (b) a lighting system disposed about said imaging system, said lighting system including at least one coaxial light source and at least one side light source with the coaxial light source and the at least one side light source having relative spectral distributions, relative light intensities and relative diffuseness characteristics selected to enhance spectral discrimination and to enhance contrast between metallic surfaces disposed on the printed circuit board and a printed circuit board surface, wherein the intensity of said coaxial light source is selected to be less than the intensity of said at least one side light source.
3 more elements
Dependencies are inferred from the claim text.