The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2007
Filed:
Mar. 04, 2003
Eiji Ichii, Tokyo, JP;
Shoji Hara, Tokyo, JP;
Eiji Ichii, Tokyo, JP;
Shoji Hara, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A data communication system comprising a terminal unit for generating light signals responsive to status of switches and a control unit for receiving the signals spatially propagated and controlling operation of a predetermined load, wherein switchesandare interposed between plus and minus linesandas power lines for supplying electric power from the control unit to the terminal unit, and connected in series with respective resistors Rand Rhaving different values of resistance, and the minus line is grounded in the control unitthrough resistor R. Potential of the minus line changes in response to switchesandand electronic signals indicative of the status of the switches are transmitted to the control unit separately from the light signals. Thus, even if the spatial propagation of the light signals is interrupted, the control over the operation of the load is secured.