Title:
エレベータ・スライドドア用の干渉補償光学的同期安全検出システム
Document Type and Number:
Japanese Patent JP4292159
Kind Code:
B2
Abstract:
A method for detecting interference energy in a sliding door safety system (10) comprising the steps of disposing at least one emitter (11) along a first vertical surface, disposing at least one receiver (17) corresponding to the at least one emitter along a second vertical surface, activating the at least one receiver, activating the at least one emitter to emit an energy beam (23) comprising a modulated square wave of a predetermined frequency, sampling an energy intensity received by the activated at least one receiver a predetermined number of times recording each time a received energy intensity to form a plurality of recorded energy intensities, selecting the lowest magnitude one of the plurality of recorded energy intensities to form a lowest recorded energy intensity, comparing the lowest recorded energy intensity to a threshold value and determining a source of the energy intensity to be external when the lowest recorded energy intensity is less than the threshold value.
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Inventors:
Richard, Psterniak
Application Number:
JP2004563169A
Publication Date:
July 08, 2009
Filing Date:
December 31, 2002
Export Citation:
Assignee:
OTIS ELEVATOR COMPANY
International Classes:
B66B13/26; B66B13/24; H01J40/14
Domestic Patent References:
JP2002193573A |
Attorney, Agent or Firm:
Tsuyoshi Hashimoto
Tomioka Kiyoshi
Tomioka Kiyoshi