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公开(公告)号：US3919527A
公开(公告)日：1975-11-11
申请号：US38278373
申请日：1973-07-26
Applicant: IBM
Inventor： BOWEN ARLEN J , DICKSON LEROY D , GORETZKI JEROME A , HENDRICKSON KENNETH E , KING DONALD P , KUEPER TERRANCE W , SODERSTROM RONALD L
CPC classification number: G06K7/10871
Abstract: An omnidirectional optical scanner scans bar coded labels passed relative to a rectangular scan window with a plurality of interlaced X''s whereby the labels are completely scanned irrespective of their orientation. The interlaced X''s are generated from a laser light source directed onto a first oscillating mirror for deflecting the light beam in a horizontal direction at a slow frequency. A second oscillating mirror is positioned to further deflect the light beam in a vertical direction at a higher frequency. The horizontal and vertical frequencies are set at a particular ratio so that the X''s overlap and the scan on the return passes midway between the legs of a previous scan. The horizontal and vertical amplitudes are controlled by horizontal and vertical photo detectors located adjacent the scan window which provide inputs to amplitude control circuits to assure an orthogonal pattern by keeping the crossing angle constant. The oscillating mirrors are phase and frequency locked by a precision digital system to assure phase lock stability and thereby prevent voids in the scan pattern. The scan window crops out the end portions of the scan pattern. Generally, the most linear parts of the scan pattern, but including the turn around portions of the scans within the scan window are used. However, in one embodiment, end mirrors fold the end portions of the scan pattern outside of the window into the scan window toward the center thereof to enhance the scanning of certain labels.
Abstract translation: 全向光学扫描仪扫描相对于具有多个交错X的矩形扫描窗口传送的条形编码标签，由此标签被完全扫描，而不管其取向如何。
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公开(公告)号：CA1051553A
公开(公告)日：1979-03-27
申请号：CA203370
申请日：1974-06-25
Applicant: IBM
Inventor： BOWEN ARLEN J , DICKSON LEROY D , GORETZKI JEROME A , HENDRICKSON KENNETH E , KING DONALD P , KUEPER TERRANCE W , SODERSTROM RONALD L
Abstract: An omnidirectional optical scanner scans bar coded labels passed relative to a rectangular scan window with a plurality of interlaced X's whereby the labels are completely scanned irrespective of their orientation. The interlaces X's are generated from a laser light source directed onto a first oscillating mirror for deflecting the light beam in a horizontal direction at a slow frequency. A second oscillating mirror is positioned to further deflect the light beam in a vertical direction at a higher frequency. The horizontal and vertical frequencies are set at a particular ratio so that the X's overlap and the scan on the return passes midway between the legs of a previous scan. The horizontal and vertical amplitudes are controlled by horizontal and vertical photo detectors located adjacent the scan window which provide inputs to amplitude control circuits to assure an orthogonal pattern by keeping the crossing angle constant. The oscillating mirrors are phase and frequency locked by a precision digital system to assure phase lock stability and thereby prevent voids in the scan pattern. The scan window crops out the end portions of the scan pattern. Generally, the most linear parts of the scan pattern, but including the turn around portions of the scans within the scan window are used. However. in one embodiment, end mirrors fold the end portions of the scan pattern outside of the window into the scan window toward the center thereof to enhance the scanning of certain labels.
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公开(公告)号：CA996183A
公开(公告)日：1976-08-31
申请号：CA187432
申请日：1973-12-05
Applicant: IBM
Inventor： HENDRICKSON KENNETH E , LOPOUR WARREN A , MATTSON LARRY F , KEIDL STEVEN D , SEGAR LAWRENCE P
Abstract: A control system for a stepping motor operating on the bang-bang principle in which opposing torque is exerted on the rotor of the motor as the rotor oscillates across its desired or home position. The degree of rotation of the rotor is indicated by a digital encoder, and associated circuitry or microprogramming provides a return torque on the rotor for a predetermined time, such as 120 microseconds, if the rotor oscillates across and beyond its desired position less than that amount required to produce an output pulse of the encoder. If the degree of oscillation is greater so that one but not two encoder pulses is produced, return torque is maintained until an encoder pulse is received after the rotor has reversed direction, and then no torque is applied on the rotor. If the oscillation is greater than that required to produce two encoder pulses but less than three encoder pulses, reverse torque is maintained on the rotor until the rotor returns to a rotative position corresponding to one encoder pulse. Then a torque is applied onto the rotor in the same direction as that in which the rotor initially rotated limited however to 120 microseconds duration. There is an overlap of torques between the two and one encoder pulse positions of the rotor as it returns to its home position. For oscillations of the rotor greater than those mentioned, similar applications of torque are made, so that the rotor is eventually brought to its home position.
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