Data handling system for pattern inspector or writer

Image analysis – Histogram processing – For setting a threshold

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

382 20, 382 56, G06K 900, G06K 950

Patent

active

049792237

ABSTRACT:
A laser pattern inspection and/or writing system which writes or inspects a pattern on a target on a stage, by raster scanning the target pixels. Inspection can also be done by substage illumination with non-laser light. A database, organized into frames and strips, represents an ideal pattern as one or more polygons. Each polygon's data description is contained within a single data frame. The database is transformed into a turnpoint polygon representation, then a left and right vector representation, then an addressed pixel representation, then a bit-mapped representation of the entire target. Most of the transformations are carried out in parallel pipelines. Guardbands around polygon sides are used for error filtering during inspection. Guardbands are polygons, and frames containing only guardband information are sent down dedicated pipelines. Error filtering also is done at the time of pixel comparisons of ideal with real patterns, and subsequently during defect are a consolidation. Defect areas are viewed as color overlays of ideal and actual target areas, from data generated during real time. Defect areas can be de-zoomed to allow larger target areas to be viewed. An autofocus keeps the scanning laser beam in focus on the target. The inspection system is used to find fiducial marks to orient the target prior to raster scanning. IC bars are provided with alignment marks for locating each IC bar. Interferometers or glass scale encoders allow the stage position to be known.

REFERENCES:
patent: 3851951 (1974-12-01), Eveleth
patent: 4541712 (1985-09-01), Whitney
patent: 4620288 (1986-10-01), Welmers
patent: 4744047 (1988-05-01), Okamoto et al.
patent: 4837447 (1989-06-01), Pierce et al.
Bademian, "Acousto-optic Laser Recording", Optical Engineering, Jan./Feb. 1981, vol. 20, No. 1, pp. 143-149, (147).
Bademian, "Acousto-optic Laser Recording", SPIE vol. 175, Airborne Recon. IV, (1979), pp. 111-123, (117).
Merry, "Acousto-optic Laser Scanning", SPIE, vol. 169, Laser Printing, (1979), pp. 56-59.
Hammer, "In-Line Anamorphic Beam Expanders", Aug. 1982, vol. 21, No. 115, Applied Optics, p. 2861.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Data handling system for pattern inspector or writer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data handling system for pattern inspector or writer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data handling system for pattern inspector or writer will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1430643

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.