Multiple beam inspection apparatus and method
First Claim
1. An optical inspection system for inspecting the surface of a substrate, comprising:
- a light source for emitting a light beam along an optical axis;
a first set of optical elements arranged for separating the light beam into a plurality of light beams, directing the plurality of light beams to intersection with the surface of the substrate, and focusing the plurality of light beams to a plurality of scanning spots on the surface of the substrate;
a second set of optical elements adapted for collecting a plurality of transmitted light beams caused by the intersection of the plurality of light beams with the surface of the substrate and by passing the plurality of light beams through the substrate, the second set of optical elements including at least a lens arrangement and a prism;
a light detector arrangement including individual light detectors that each receive individual ones of the plurality of transmitted light beams, the light detectors being arranged for sensing the light intensity of the transmitted light beams, wherein the lens arrangement focuses the plurality of transmitted light beams onto the prism, and the prism directs the individual ones of the plurality of transmitted light beams towards the individual light detectors of the light detector arrangement; and
a control system for controlling the optical components of the first and second optical elements, and for receiving scan signals from each of the light detectors of the light detector arrangement.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is an optical inspection system for inspecting the surface of a substrate. The inspection system includes a light source for emitting a light beam along an optical axis and a first set of optical elements arranged for separating the light beam into a plurality of light beams, directing the plurality of light beams to intersection with the surface of the substrate, and focusing the plurality of light beams to a plurality of scanning spots on the surface of the substrate. The inspection system also includes a second set of optical elements adapted for collecting a plurality of transmitted light beams caused by the intersection of the plurality of light beams with the surface of the substrate and a light detector arrangement including individual light detectors that each receive individual ones of the plurality of transmitted light beams. The light detectors are arranged for sensing the light intensity of the transmitted light beams.
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Citations
26 Claims
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1. An optical inspection system for inspecting the surface of a substrate, comprising:
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a light source for emitting a light beam along an optical axis;
a first set of optical elements arranged for separating the light beam into a plurality of light beams, directing the plurality of light beams to intersection with the surface of the substrate, and focusing the plurality of light beams to a plurality of scanning spots on the surface of the substrate;
a second set of optical elements adapted for collecting a plurality of transmitted light beams caused by the intersection of the plurality of light beams with the surface of the substrate and by passing the plurality of light beams through the substrate, the second set of optical elements including at least a lens arrangement and a prism;
a light detector arrangement including individual light detectors that each receive individual ones of the plurality of transmitted light beams, the light detectors being arranged for sensing the light intensity of the transmitted light beams, wherein the lens arrangement focuses the plurality of transmitted light beams onto the prism, and the prism directs the individual ones of the plurality of transmitted light beams towards the individual light detectors of the light detector arrangement; and
a control system for controlling the optical components of the first and second optical elements, and for receiving scan signals from each of the light detectors of the light detector arrangement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An optical inspection system for inspecting a surface of a substrate, comprising:
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a transmitted light optical arrangement disposed along an optical axis and including at least a first lens and second lens, both of which are arranged to move along the optical axis, and a prism, which is arranged to move orthogonal to the optical axis, the transmitted light optical arrangement being arranged for directing a plurality of transmitted light beams, which are formed by scanning the substrate with a plurality of light beams, onto a plurality of light detectors; and
a control system for controlling the transmitted light optical arrangement so as to maintain separation of the plurality of beams on the light detectors, the control system including at least a first lens drive, a second lens drive and a prism drive, all of which are coupled to a control interface, which is arranged to control the drives, the first lens drive is arranged to actuate the movement of the first lens, the second lens drive is arranged to actuate the movement of the second lens, and the prism drive is arranged to actuate the movement of the prism. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification