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Publication numberUS3827809 A
Publication typeGrant
Publication dateAug 6, 1974
Filing dateMay 11, 1973
Priority dateMay 12, 1972
Publication numberUS 3827809 A, US 3827809A, US-A-3827809, US3827809 A, US3827809A
InventorsP Nash
Original AssigneeP Nash
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Circuits for deriving a common output signal from a plurality of amplifiers in apparatus for detecting blemishes in sheet material
US 3827809 A
Abstract
A circuit for combining the outputs of several amplifiers, through an array of diodes, so that the combined output has a noise content whose amplitude is less than that of the individual amplifier outputs. The circuit is described as part of an inspection system for detecting blemishes in sheet material flowing past a series of photo-sensitive devices, the amplifiers receiving the outputs of the photo-sensitive devices.
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Description  (OCR text may contain errors)

nlted States Patent 1191 1111 ,827,809 Nash Aug. 6, 1974 CIRCUITS FOR DERIVING A COMMON 3,128,385 4/l964 Scharf et al 250/562 OUTPUT SIGNAL FROM A PLURALITY 0 3206.606 9/ I965 Burgo et al. 356/200 X AMPLIFIERS IN APPARATUS FOR DETECTING BLEMISIIES IN SHEET MATERIAL Primary Exammer.lames W. Lawrence Assistant Examinef-T. N. Grigsby Inventor! Paul Nash, 44 WeStbOUrne en, Attorney, Agent, or FirmBrowdy and Neimark London, England [22] Filed: May 11, I973 [21] App]. No.: 359,511 57 ABSTRACT [30] Foreign Application Prioi'ity Data A circuit for combining the outputs of several amplifi- May 12, 1972 Great Britain 22393/72 through an array of diodes, so that h m ined May 19, 1972 Great Britain 23/11/72 Output has a noise content Whose amplitude is less than that of the individual amplifier outputs. The cir- 52 us. (:1. 356/200, 250/562 wit is described as part of an inspection system for 5 1m, 01 21 30 2 32 301 21 30 detecting blemishes in sheet material flowing past a 581 Field of Search 250/562; 356/200 series of photo-sensitive devices, the amplifiers receiving the outputs of the photo-sensitive devices. [56] References Cited UNITED STATES PATENTS 15 Claims, 41 Drawing Figures 3,105.152 9/]963 Nash 356/200 PATENTEnws slam sum as or 23 PATENTEU M13 6 I974 saw on or 23 PAIENIED AUG 61974 sum as or 23 PAIENHU MN; 61974 arm 01 0F 23 PATENTEDAUE 61974 sum as or 23 FIG. 6A.

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Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3105152 *Jan 8, 1960Sep 24, 1963Paul NashInspection of sheet materials by photoelectric means
US3128385 *Feb 18, 1959Apr 7, 1964Cutler Hammer IncPhotosensitive hole detector using phosphor radiation source
US3206606 *Jul 20, 1961Sep 14, 1965Eastman Kodak CoPhotosensitive inspection method and apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4099884 *Jul 23, 1976Jul 11, 1978Paul NashOptical inspection systems
US4402604 *Mar 18, 1981Sep 6, 1983Paul NashMethod for the on-line measurement of inclusions in pulp
US5326963 *Oct 2, 1992Jul 5, 1994Kronos IncorporatedElectro-optic barcode reader
US5471043 *Apr 15, 1994Nov 28, 1995Kronos IncorporatedElectro-optic barcode reader
US6369588Nov 9, 1999Apr 9, 2002Gerard E. SleefeSensor system for web inspection
Classifications
U.S. Classification356/430, 250/559.46, 365/127
International ClassificationG01N21/89, H03K5/02
Cooperative ClassificationG01N21/896, G01N2201/0813, H03K5/02, G01N21/8903
European ClassificationH03K5/02, G01N21/89B2