Lighting unit for inspecting a surface
Patent 6053621 Issued on April 25, 2000. Estimated Expiration Date: 
December 23, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 23, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1943510 3278740 3409770 3857626 Illuminating device and method for a component detecting apparatus Marker lamp with halo effect Silhouette lightpipe illumination for vehicle instrumentation Illuminating device Display sign Microscope illuminating apparatus InventorAssigneeApplicationNo. 997411 filed on 12/23/1997US Classes:362/245, With reflector356/237.2, Surface condition362/311, Including translucent or transparent modifier362/327, With reflector362/329Enclosure typeExaminersPrimary: Cariaso, AlanAttorney, Agent or FirmInternational ClassF21V 013/04AbstractA lighting unit for examining the quality of a product, wherein the lighting unit can be easily assembled, has a small number of components, and emits light from a surface at a light intensity with little unevenness. An illuminant assembly of the lighting unit comprises a ring-shaped transparent body for light diffusion, and a plurality of illuminants such as light-emitting diodes that are positioned along the periphery of the transparent body and are capable of emitting light toward the center of the transparent body. Light emitted from the illuminants passes through the transparent body while being reflected and scattered, and is emitted uniformly from an underside surface of the transparent body, providing emission of light from a surface at an even light intensity.Field of SearchEdge illuminated modifier or light rod/pipePlural light sources Refractor type modifier With reflector Diffusing type Enclosure type Panel type With reflector Inspection type Including translucent or transparent modifier Surface condition Detection of object or particle on surface On patterned or topographical surface (e.g., wafer, mask, circuit board) On patterned or topographical surface (e.g., wafer, mask, circuit board) With comparison to master, desired shape, or reference voltage With annular lighting structure Including a nonspherical surface Cylindrical Toroidal | |
