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    System and method for medium access control in a wireless network
    14.
    发明专利
    System and method for medium access control in a wireless network 未知

    公开(公告)号：AU2003265675A8

    公开(公告)日：2004-03-11

    申请号：AU2003265675

    申请日：2003-08-25

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： KATZ JOSEPH ,  SHARONY JACOB

    IPC: H04L12/28 ,  H04L12/56 ,  H04Q7/20 ,  H04M11/00 ,  H04B7/00

    Abstract: Described is a method and system for an access control in a communication network which includes a first wireless unit, a second wireless unit and at least one further unit. The first unit generates a frame for the second unit. The frame includes a first portion and a second portion. The first portion includes data indicating that the first unit is about to establish a direct communication channel with the second unit. The first portion is transmitted to the second unit and is received by the at least one further wireless unit. The direct communication channel is established between the first unit and the second unit for transmission the second portion. During the transmission of the second portion, the at least one further unit abstains from communications using the direct communication channel.

    16.
    发明专利
    未知

    公开(公告)号：DE69330330T2

    公开(公告)日：2002-04-25

    申请号：DE69330330

    申请日：1993-09-30

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BARD SIMON ,  KATZ JOSEPH ,  STERN MIKLOS ,  LI YAJUN

    IPC: G06K7/10 ,  G09C5/00

    Abstract: The laser diode (133) of an optical scanning system (100) is located in a separate unit (130) and light therefrom carried to a remote scan head (110) via an optical fiber (150). This reduces the size and weight of the scan head (110) and reduces the temperature sensitivity of the scan head (110). The scan head (110) may include an optical sensor (117) for detecting light reflected from scanned symbols.

    18.
    发明专利
    未知

    公开(公告)号：DE69330769D1

    公开(公告)日：2001-10-25

    申请号：DE69330769

    申请日：1993-06-14

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： KATZ JOSEPH ,  METLITSKY BORIS ,  SWARTZ JEROME ,  BARKAN EDWARD ,  SPITZ GLENN S

    IPC: G06K7/00 ,  G06K7/10

    Abstract: A symbol scanning system which adaptively changes scanning system parameters including light beam pattern and focus to improve barcode readability. The scanning system including: a scanner, responsive to coordinate control signals, for directing a light beam in a pattern at a symbol at a predetermined location, detecting a reflected portion of the light beam, and generating a feedback signal corresponding to the detected portion of the reflected light beam; a microprocessor, responsive to the feedback signal, for generating pattern control signals; a pattern generator for generating the coordinate control signals in responsive to the pattern control signals and for determining the light beam pattern; and signal processing circuitry, including drive and control units, for adjusting gain, bandwidth, and digitizer threshold levels.

    19.
    发明专利
    未知

    公开(公告)号：ES2157910T3

    公开(公告)日：2001-09-01

    申请号：ES93113699

    申请日：1993-08-26

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： MAROM EMANUEL ,  KATZ JOSEPH

    IPC: G06K7/015 ,  G06K7/10

    Abstract: The use of linear axicons or similar optical elements in a bar code scanner produces a scanning spot of a size correlated generally with dimensions of features of the scanned information, wherein the spot size remains substantially constant for varying distances between the scanner and the symbol over a substantial range of distances. Optical elements of this type produce a diffraction pattern comprising a central lobe and a number of rings surrounding the central lobe. An aperture is provided to limit the beam and thus the number of rings in the pattern which actually reach the symbol during scanning. The extent of the limited beam and the phase front tilt angle produced by the optical element are chosen to produce a desired resolution, which relates to the density of symbols the scanner is to read, and to produce a desired working range. The invention also provides a modular light emitting device including a universal light emitting module and an optical assembly, including the axicon and aperture, mounted on the module to adapt the optical characteristics of light from the module to conform to the requirements of a particular scanning application.

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