Title:
PHOTOELECTRIC OBJECT DETECTOR
Document Type and Number:
Japanese Patent JPS6329591
Kind Code:
A
Abstract:
PURPOSE:To enable a detected object to be detected more accurately than usual despite the dispersion in the transmittivity and the reflecting power of the detected item by a method wherein a processing circuit to judge the existance of detected object is provided to process output signals from the first and the second photodetectors as input. CONSTITUTION:The light Ph1 from the first light emitting element 6 is reflected on a detected object 9 to be inputted in a photodetector 8 forming the first reflecting type light coupling channel while the light Ph2 from the second light emitting element 7 is reflected on the detected object 9 to be inputted in the photodetector 8 forming the second light coupling channel. The first and the second light emitting elements 6, 7 are time differentially driven not to be lighted simultaneously so that the output signal level Vs of photodetector 8 may be compared with the first reference level Vr1 in case the first light emitting element 6 is lighted in the processing circuit 10 while to be compared with the second reference level Vr2 in case the second light electrode 7 is lighted (provided Vr2=Vr1, Vs>=Vr2 to be the existance judgement results a of the detected object 9.
Inventors:
KASHIWAKURA AKIO
TAKASUKA MASANOBU
TAKASUKA MASANOBU
Application Number:
JP17333186A
Publication Date:
February 08, 1988
Filing Date:
July 22, 1986
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H01L31/12; (IPC1-7): H01L31/12
Domestic Patent References:
| JPS50143484A | 1975-11-18 | |||
| JP60158756B | ||||
| JP62118464B | ||||
| JPS61128108A | 1986-06-16 |
Attorney, Agent or Firm:
Yoshihiro Morimoto