Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
CHARGE DISPLAY DEVICE
Document Type and Number:
Japanese Patent JPS63106570
Kind Code:
A
Abstract:

PURPOSE: To easily discriminate a live line from a dead line through a cover, by a method wherein a liquid crystal element is operated by the voltage difference between AC voltages induced in respective current collection plates when AC voltage is applied to a plurality of cores of an insulated wire.

CONSTITUTION: A current collection plate 3 and a current collection plate 4 are different in a geometrical relative position with respect to three core wires 1a, 1b, 1c. Now, when symmetric three-phase voltages are applied to the core wires 1a, 1b, 1c, voltages different in a phase are induced in the current collection plates 3, 4. By operating a liquid crystal display element 5 by applying both voltages to said display element 5, it can be displayed that a three-phase insulated wire 10 is in a charge state. The difference voltage appearing between the current collection plates 3, 4 is different by the relative positional relation between the current collection plates 3, 4 and the core wires 1a, 1b, 1c. When the mount positions of the current collection plates 3, 4 are successively rotated by 360° around the core wires symmetrically arranged of the three-phase insulated wire 10, since the max. value appears at every 60°, the areas of the current collection plates 3, 4 are selected so that the min. value of said difference voltage becomes sufficiently larger than the min. operation voltage of the liquid crystal display element 5.


More Like This:
Inventors:
NAGANO YASUO
TAWARA TOKUO
OKURA MASATO
SHIBATA MAKIO
DAICHO YOSHIO
Application Number:
JP25080886A
Publication Date:
May 11, 1988
Filing Date:
October 23, 1986
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
TAKAOKA IND LTD
International Classes:
G01R19/155; G09F9/00; (IPC1-7): G01R19/155; G09F9/00
Domestic Patent References:
JPS58174858A1983-10-13
JPS5893876A1983-06-03
JPS58135968A1983-08-12



 
Previous Patent: JPS63106569

Next Patent: JPS63106571