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    BAR CODE SYMBOL READERS WITH EDGE ENHANCEMENT
    91.
    发明专利
    BAR CODE SYMBOL READERS WITH EDGE ENHANCEMENT 未知

    公开(公告)号：CA2026371A1

    公开(公告)日：1991-05-21

    申请号：CA2026371

    申请日：1990-09-27

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： METLITSKY BORIS ,  BARKAN EDWARD ,  SWARTZ JEROME

    IPC: G06K7/10

    Abstract: The depth of modulation of an analog electrical signal generated by a photodetector during scanning of a bar code symbol in the field of bar code scanning is enhanced under circumstances where the modulation of the analog signal has been degraded, for example, by an oversized sampling aperture in relation to the widths of the symbol elements. The analog signal has high frequency components whose Low amplitudes are increased in magnitude prior to being conducted to a digitizer. The effect of noise introduced during reading of the bar code is cancelled by comparing in the comparator, the modulation-enhanced analog signal with the second derivative signal derived from the modulation-degraded unenhanced analog signal. The output of the comparator is a digital output signal having a logical level dependent on the amplitude of the enhanced analog signal at each zero crossing of the second derivative signal. The digital output signal is a closer representation of the code read by the scanner.

    NARROW-BODIED, SINGLE-AND TWIN-WINDOWED PORTABLE LASER SCANNING HEAD FOR READING BAR CODE SYMBOLS
    93.
    发明专利
    NARROW-BODIED, SINGLE-AND TWIN-WINDOWED PORTABLE LASER SCANNING HEAD FOR READING BAR CODE SYMBOLS 未知

    公开(公告)号：CA1189970A

    公开(公告)日：1985-07-02

    申请号：CA420006

    申请日：1983-01-21

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： SHEPARD HOWARD M ,  BARKAN EDWARD D ,  SWARTZ JEROME

    IPC: G06K7/10 ,  G06K17/00 ,  G11B7/135 ,  G11B7/12 ,  H01S3/081

    Abstract: A narrow-bodied, single- and twin-windowed, hand-held, laser scanning head for reading bar code symbols includes at least one window mounted at the rear region of the head, and through which either the incident beam going to the symbol and/or the reflected beam returning from the symbol, passes unobstructedly and exteriorly of, and past, the front and intermediate body regions of the head. A field-replaceable laser tube arrangement, a laser tube and method of making the same, an arrangement for and method of controlling a scanning system, optical passive elements for increasing the depth of field, a trigger protective device, and a one-piece support bench and method of fabricating the same by massproduction techniques are also disclosed.

    95.
    发明专利
    未知

    公开(公告)号：DE2838243A1

    公开(公告)日：1980-01-03

    申请号：DE2838243

    申请日：1978-09-01

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： SWARTZ JEROME ,  HARRISON SHELLEY A ,  BARKAN EDWARD ,  DELFINE FRANK ,  BROWN GEORGE

    IPC: G06K7/10 ,  G06K9/02 ,  G11B7/00

    Abstract: Laser light reflected from a bar code symbol pattern is detected by a photodetector mounted in a portable scanning head of a laser scanning system. By selecting appropriate threshold values on the analog signal generated by the photodetector, the analog signal is converted to a series of pulses, each pulse width accurately corresponding to the width of a bar from the scanned pattern. A plurality of functions can be determined from the series of pulses, each function being independently selected by keyboard entry from the head, displayed on the head, and/or recorded by a printer remote from the head. Single line or multiple line scans in two orthogonal directions relative to the pattern may be selected. A bimorph or speaker-type oscillatory element may be utilized as a miniature scanning element. Circuitry for synchronizing scanning along both axes, and for generating a signal to drive the bimorph in a uniform, constant velocity manner is also disclosed.

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