Radio field intensity measurement device, and radio field intensity detector and game console using the same
First Claim
1. A radio field intensity measurement device comprising:
- an antenna configured to convert a received radiowave to an induction signal;
a rectifier circuit configured to output a direct signal by rectifying the induction signal;
a battery to be charged by the direct signal;
a control circuit configured to compare a potential of the direct signal with an output potential of the battery;
an amplifier circuit configured to amplify the direct signal; and
a display element which is operated depending on the direct signal amplified by the amplifier circuit,wherein the control circuit is configured to charge the battery when the potential of the direct signal is higher than the output potential of the battery, and supply power of the battery to the amplifier circuit when the potential of the direct signal is lower than the output potential of the battery.
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Accused Products
Abstract
The present invention provides a radio field intensity measurement device having a display portion with improved visibility, in the case of measuring a weak radiowave from a long distance. In the radio field intensity measurement device, a battery is provided as a power source for power supply and the battery is charged by a received radiowave. When a potential of a signal obtained from the received radiowave is higher than an output potential of the battery, the power is stored in the battery. On the other hand, when the potential of the signal obtained from the received radiowave is lower than the output potential of the battery, power produced by the battery is used as power to drive the radio field intensity measurement device. As an element to display the radio field intensity, a thermochromic element or an electrochromic element is used.
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Citations
24 Claims
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1. A radio field intensity measurement device comprising:
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an antenna configured to convert a received radiowave to an induction signal; a rectifier circuit configured to output a direct signal by rectifying the induction signal; a battery to be charged by the direct signal; a control circuit configured to compare a potential of the direct signal with an output potential of the battery; an amplifier circuit configured to amplify the direct signal; and a display element which is operated depending on the direct signal amplified by the amplifier circuit, wherein the control circuit is configured to charge the battery when the potential of the direct signal is higher than the output potential of the battery, and supply power of the battery to the amplifier circuit when the potential of the direct signal is lower than the output potential of the battery. - View Dependent Claims (2, 3, 4, 15, 18)
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5. A radio field intensity measurement device comprising:
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an antenna configured to convert a received radiowave to an induction signal; a rectifier circuit configured to output a direct signal by rectifying the induction signal; a battery to be charged by the direct signal; a control circuit configured to compare a potential of the direct signal with an output potential of the battery; an amplifier circuit configured to amplify the direct signal; and a display element which is operated depending on the direct signal amplified by the amplifier circuit, wherein the control circuit is configured to charge the battery when the potential of the direct signal is higher than the output potential of the battery, and supply power of the battery to the amplifier circuit when the potential of the direct signal is lower than the output potential of the battery, and wherein the display element includes a resistance heating element and a thermochromic element. - View Dependent Claims (6, 7, 8, 9, 16, 19)
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10. A radio field intensity measurement device comprising:
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an antenna configured to convert a received radiowave to an induction signal; a rectifier circuit configured to output a direct signal by rectifying the induction signal; a battery to be charged by the direct signal; a control circuit configured to compare a potential of the direct signal with an output potential of the battery; an amplifier circuit configured to amplify the direct signal; and a display element which is operated depending on the direct signal amplified by the amplifier circuit, wherein the control circuit is configured to charge the battery when the potential of the direct signal is higher than the output potential of the battery, and supply power of the battery to the amplifier circuit when the potential of the direct signal is lower than the output potential of the battery, and wherein the display element includes a voltage application element and an electrochromic element. - View Dependent Claims (11, 12, 13, 14, 17, 20)
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21. A security device in the public vehicle comprising
an antenna configured to convert a received radiowave to an induction signal; -
a rectifier circuit configured to output a direct signal by rectifying the induction signal; an amplifier circuit configured to amplify the direct signal; and a display element which is operated depending on the direct signal amplified by the amplifier circuit. - View Dependent Claims (22, 23, 24)
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Specification