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Patent Searching and Data


Title:
DISTANCE SENSOR
Document Type and Number:
Japanese Patent JPS6050403
Kind Code:
A
Abstract:

PURPOSE: To measure a distance highly accurately, by projecting the light beams from two light sources on an object surface by optical fibers, receiving the reflected light beams through separate optical fibers, and obtaining the distance based on a ratio between the signals of the quantities of the received light beams from the light sources.

CONSTITUTION: Light projecting optical fibers 1 comprise two pieces of optical fibers. Light sources 2 comprise two light emitting diodes. Two driving circuits 3 turn ON the light sources 2. Light beams 9a and 9b are projected on an object surface 4 from the light projecting fibers 1. Parts 10a and 10b of the reflected light beams are received by a photoelectric conversion element 6 through a light receiving optical fiber 5, and converted into an electric signal C. The signal is inputted to two bandpass filters 7. The frequencies of the driving signals A and B are made different. Only the signals having respective frequencies are detected by the bandpass filters 7. Therefore, the output signals D and E of the bandpass filters 7 become the signals, which are proportional to the quantities of the received light beams from the two LEDs of the light sources 2.


Inventors:
FUJIWARA YOSHIMASA
Application Number:
JP15966183A
Publication Date:
March 20, 1985
Filing Date:
August 30, 1983
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
G01B11/00; G01B11/02; G01D5/26; (IPC1-7): G01B11/00
Attorney, Agent or Firm:
Shigeji Sato (1 person outside)