Title:
UNMANNED CARRYING TRUCK
Document Type and Number:
Japanese Patent JPH03266002
Kind Code:
A
Abstract:
PURPOSE:To eliminate the route undetectability caused by deterioration of a reflection fact of a route detecting SUS plate by providing an integrator, and correcting a level of a reference signal in accordance with a level of a detecting signal. CONSTITUTION:An infrared ray 4 from a light emitter 3 bits an SUS plate 5 stuck onto the floor surface and becomes a reflected light 6 and is received by a photodetector 7, and its photodetecting voltage is inputted to an amplifier 9. An amplified voltage 10 is divided into two, one of them is connected to a comparing signal side of a comparator 13, and the other is connected to an input of an integrator 16 constituted of a capacitor 15a and an amplifier 15b. With respect to a signal integrated by the integrator 16, by a variable resistor 11, a value 17 being a little smaller than a level of the amplified voltage 10 is made, and it is used as a reference voltage of the comparator 13. In such a way, the value 17 is varied in accordance with intensity of an input signal, therefore, even if a level of the reflected light 6 decreases due to contamination of the SUS plate 5, etc., it does not occur that a route becomes undetectable.
Inventors:
KADOWAKI YOSHISANE
Application Number:
JP6617190A
Publication Date:
November 27, 1991
Filing Date:
March 16, 1990
Export Citation:
Assignee:
NEC YAMAGATA LTD
International Classes:
G05D1/02; B61B13/00; (IPC1-7): B61B13/00; G05D1/02
Attorney, Agent or Firm:
Sugano Naka