[특허]Optical scanners

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06K-007/10
출원번호	US-0436468 (1999-11-08)
발명자 / 주소	Bridgelall Raj Barkan Edward Shellhammer Stephen Campanelli Joseph Katz Joseph Li Yajun McGlynn Daniel R.
출원인 / 주소	Symbol Technologies, Inc.
인용정보	피인용 횟수 : 39 인용 특허 : 33

초록 ▼

An optical scanning system is provided for producing a signal representative of a spatial distribution of indicia having different degrees of reflectivity to light, such as a bar code (14). The system includes an optical scanner (12) for scanning beam of light over the spatial distribution of indici

An optical scanning system is provided for producing a signal representative of a spatial distribution of indicia having different degrees of reflectivity to light, such as a bar code (14). The system includes an optical scanner (12) for scanning beam of light over the spatial distribution of indicia (14) and for producing an electrical signal corresponding to changes in the degree of reflectivity of the indicia. A digitizer (20), responsive to detections in a predetermined characteristic of the produced electrical signal is provided. The digitizer (20) converts the detections into digital words, such digital signals having a plurality of bits. The digitizer includes a timing generation circuit (42) for producing a pulse in response to each one of the detections with a time duration representative of the degree of reflectivity of the indicia as the beam of light. A decoder converts the time duration of the pulse into the digital word having a plurality of bits. An enhancement filter (30) is also disclosed. The enhancement filter (30) modifies pulses produced by a differentiator circuit (24) used in the scanner. Such modification includes increasing the rise time, and peak level of, the pulses produced by the differentiator circuit (24).

대표청구항 ▼

[What is claimed is:] [1.]a) a scanner for scanning the bar code with a plurality of scan patterns using a plurality of lasers;b) a sensor for sensing light reflected from the bar code on a first scan and for producing an electrical signal representative of the bar code indicia;c) a comparator for c

[What is claimed is:] [1.]a) a scanner for scanning the bar code with a plurality of scan patterns using a plurality of lasers;b) a sensor for sensing light reflected from the bar code on a first scan and for producing an electrical signal representative of the bar code indicia;c) a comparator for comparing a first signal corresponding to the electrical signal against a threshold range to identify whether features of the first signal fall within the threshold range; andd) an adjuster for varying a parameter of the device on a subsequent scan if the comparison is unsuccessful.

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이 특허에 인용된 특허 (33) 인용/피인용 타임라인 분석

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Van Tyne Richard G. (Richardson TX) Neff Marion W. (Euless TX) Mondie George R. (Bedford TX), Bar code location and recognition processing system.
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Mertel Michael E. (Renton WA) Thomas James E. (Seattle WA), Decoding of barcodes by preprocessing scan data.
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Brosnan Michael (Fremont CA) Quan Ronald (Cupertino CA), Digital bar code slot reader with threshold comparison of the differentiated bar code signal.
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Hanchett Leland J. (Winchester MA), Error detection and sequence maintaining system for bar-code readers.
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Krichever Mark (Hauppauge NY) Gofman Yuri (Brooklyn NY) Shepard Howard M. (Great River NY), Laser diode scanner with improved shock mounting.
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Shuren Thomas E. (Stanhope NJ), Method and apparatus for bar code data autodiscrimination.
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Hester Gerald P. (Santa Ana CA) Sherer Paul (Costa Mesa CA), Method and apparatus for reading and decoding a high density linear bar code.
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Sherer Paul (Costa Mesa CA), Method and apparatus for reading bar coded data wherein the light source is periodically energized.
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Laser Vadim (994 Twincrest Ct. Cincinnati OH 45231), Method and apparatus for remotely reading and decoding bar codes.
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Frontino Louis J. (Cherry Hill NJ), Method and apparatus for variable speed scanning of bar codes.
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Cherry Craig D. (Eugene OR), Method and system for control of a bar code scanner threshold.
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Goren David P. (Bonkonkoma NY), Multi-bit digitizer.
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Barkan Edward (South Setauket NY) Goren David P. (Ronkonkoma NY) Katz Joseph (Stony Brook NY) Li Yajun (Holtsville NY) Swartz Jerome (Old Field NY) Mazz Thomas (Huntington Station NY), Multi-resolution bar code reader.
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Shepard Howard M (Great River NY) Barkan Edward D. (South Setauket NY) Swartz Jerome (Stonybrook NY), Narrow bodied, single- and twin-windowed portable laser scanning head for reading bar code symbols.
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Shepard Howard M. (Great River NY) Barkan Edward D. (South Setauket NY) Swartz Jerome (Stonybrook NY), Narrow-bodied, single-and twin-windowed portable laser scanning head for reading bar code symbols.
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Shepard Howard M. (Great River NY) Barkan Edward D. (South Setauket NY) Swartz Jerome (Stonybrook NY), Narrow-bodied, single-and twin-windowed portable laser scanning head for reading bar code symbols.
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Swartz Jerome (Setauket NY) Shepard Howard M. (Great River NY) Barkan Eric F. (San Francisco CA) Krichever Mark J. (Hauppauge NY) Metlitsky Boris (Hauppauge NY) Barkan Edward (South Setauket NY) Adel, Portable laser diode scanning head.
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Swartz Jerome (Stonybrook NY) Harrison Shelley A. (Dix Hills NY) Barkan Edward (Bayshore NY) Delfine Frank (Farmingville NY) Brown George (Oquossoc ME), Portable laser scanning arrangement for and method of evaluating and validating bar code symbols.
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Swartz Jerome (Stonybrook NY) Harrison Shelley A. (Dix Hills NY) Barkan Edward (Bayshore NY) Delfine Frank (Farmingville NY) Brown George (Oquossoc ME), Portable laser scanning arrangement for and method of evaluating and validating bar code symbols.
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Swartz Jerome (Long Island City NY) Barkan Edward (Long Island City NY) Harrison Shelley A. (Dix Hills NY), Portable laser scanning system and scanning methods.
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Gieles Antonius C. M. (Eindhoven NLX) Sterken Hendrikus P. M. (Eindhoven NLX) Venema Willem J. (Eindhoven NLX), Reading device for bar codes.
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Deming Chandler R. (San Diego CA), Reproduction of binary signals from a recording medium that may be read at varying speeds.
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Heiman Frederic (Los Gatos CA) Spitz Glenn (Far Rockaway NY), Scanning system with adjustable light output and/or scanning angle.
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Shimizu Masaharu (Tokyo JPX) Usami Tatsuyuki (Tokyo JPX) Saito Yoshihiro (Tokyo JPX) Nakamura Nobuhiro (Tokyo JPX), bar code reader signal processing method and device.
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Wilz, Sr., David M.; Movsessian, Sergio; Ji, Hong; Haggerty, Thomas, Laser scanning code symbol reading system employing programmable decode time-window filtering.
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Wilz, Sr., David M.; Movsessian, Sergio; Ji, Hong; Haggerty, Thomas, Laser scanning code symbol reading system employing programmable decode time-window filtering.
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Brady, Robert Hugh; Colavito, Stephen; Wilz, Sr., David; Teng, Zhipeng; Dixon, Myron Levon, Laser scanning code symbol reading system providing improved control over the length and intensity characteristics of a laser scan line projected therefrom using laser source blanking control.
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Tsikos, Constantine J.; Knowles, C. Harry; Wirth, Allan; Good, Timothy A.; Jankevics, Andrew, METHOD OF SPECKLE-NOISE PATTERN REDUCTION AND APPARATUS THEREFOR BASED ON REDUCING THE TEMPORAL-COHERENCE OF THE PLANAR LASER ILLUMINATION BEAM BEFORE IT ILLUMINATES THE TARGET OBJECT BY APPLYING TEM.
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