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.

公开(公告)号：FR2438302A1

公开(公告)日：1980-04-30

申请号：FR7913847

申请日：1979-05-30

Applicant: SYMBOL TECHNOLOGIES INC

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

IPC: G06K7/10 ,  G06K9/18 ,  G07G1/00

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.