Title:
ロック可能な差分処理を行う光電セル
Document Type and Number:
Japanese Patent JP4318762
Kind Code:
B2
Abstract:
A photoelectric cell which detects a distance of an object, including: a first detection component configured to produce a first current which is a function of the distance of the object; a second detection component configured to produce a second current which is a function of the distance of the object; and, a processing circuit configured to shape a first voltage signal and a second voltage signal that correspond to the first current and second current, respectively. The processing circuit includes a main comparator configured to determine whether the distance of the object is greater or less than a detection range of said photoelectric cell by comparing the first voltage signal and the second voltage signal and to output a switching signal indicative of whether the distance of the object is greater or less than the detection range, and, a locking comparator configured to maintain the switching signal in an inactive state when the first voltage signal is less than a set-point voltage which corresponds to a detection distance greater than the detection range.
Inventors:
Alan, Guillo
Pierre, Charlier
Pierre, Charlier
Application Number:
JP33382097A
Publication Date:
August 26, 2009
Filing Date:
December 04, 1997
Export Citation:
Assignee:
SCHNEIDER ELECTRIC INDUSTRIES SAS
International Classes:
G01B11/00; G01S17/08; G01C3/06; G01S7/4861
Domestic Patent References:
| JP59148033A | ||||
| JP854231A | ||||
| JP59139519A |
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
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