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Title:
RADIOWAVE INTENSITY MEASURING DEVICE, AND RADIOWAVE INTENSITY SENSOR AND AMUSEMENT EQUIPMENT USING THE RADIOWAVE INTENSITY MEASURING DEVICE
Document Type and Number:
Japanese Patent JP2008145426
Kind Code:
A
Abstract:

To improve the visibility of a display element in a radiowave intensity measuring device for weak long-distance radiowaves.

A battery as a power supply for supplying electric power to the radiowave intensity measuring device is included and charged with the radiowaves received. The electric power is stored in the battery, when the potential of the signal obtained by the received radiowaves is larger than the output potential of the battery. The electric power of the battery generated is used as the power supply, to drive the radiowave intensity measuring device, when the potential of the signal obtained by the received radiowaves is smaller than the output potential of the battery. A thermochromic element or electrochromic element is used as an element for displaying the intensity of radiowaves.


Inventors:
DENPO HIROKI
MIYAGUCHI ATSUSHI
Application Number:
JP2007294157A
Publication Date:
June 26, 2008
Filing Date:
November 13, 2007
Export Citation:
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Assignee:
SEMICONDUCTOR ENERGY LAB
International Classes:
G01R29/08; G01R29/10; H04B1/16
Domestic Patent References:
JPH10222108A1998-08-21
JPH10197581A1998-07-31
JPH11345292A1999-12-14
JP2006023817A2006-01-26
JP3063391U1999-10-29
JP2006521162A2006-09-21
JP2003111301A2003-04-11
JP2000224775A2000-08-11