Wireless sensor device
View Patent ↗A wireless sensor device capable of constant operation without replacement of batteries. The wireless sensor device is equipped with a rechargeable battery and the battery is recharged wirelessly. Radio waves received at an antenna circuit are converted into electrical energy and stored in the battery. A sensor circuit operates with the electrical energy stored in the battery, and acquires information. Then, a signal containing the information acquired is converted into radio waves at the antenna circuit, whereby the information can be read out wirelessly.
1. A wireless sensor device comprising:
a substrate provided with a circuit;
an antenna circuit for transmission and reception of radio waves, wherein the antenna circuit is formed on the substrate;
a battery for storing electrical energy obtained from the radio waves;
an image pickup device over the substrate; and
a package packing the substrate, the antenna circuit, the battery and the image pickup device,
wherein the substrate is over the battery, and
wherein the circuit includes a rectifier circuit, a demodulation circuit, a modulation circuit and a logic circuit.
2. A wireless sensor device comprising:
a substrate provided with a circuit;
a first antenna circuit formed on the substrate;
a second antenna circuit formed on the substrate;
a battery;
an image pickup device over the substrate; and
a package packing the substrate, the first antenna circuit, the second antenna circuit, the battery and the image pickup device,
wherein the circuit includes a rectifier circuit, a demodulation circuit, a modulation circuit and a logic circuit,
wherein the substrate is over the battery,
wherein radio waves are converted into electrical energy at the first antenna circuit;
wherein the electrical energy is stored in the battery after rectified by the rectifier circuit; and
wherein radio waves containing information of an image acquired by the image pickup device are radiated from the second antenna circuit.
3. The wireless sensor device according to claim 1 , further comprising a ferrite interposed between the substrate and the battery.
4. The wireless sensor device according to claim 2 , further comprising a ferrite interposed between the substrate and the battery.
5. The wireless sensor device according to claim 1 , further comprising a flexible printed board electrically connecting the circuit and the battery.
6. The wireless sensor device according to claim 2 , further comprising a flexible printed board electrically connecting the circuit and the battery.
7. The wireless sensor device according to claim 1 , further comprising a memory circuit for storing information of an image acquired by the image pickup device.
8. The wireless sensor device according to claim 2 , further comprising a memory circuit for storing the information of the image acquired by the image pickup device.
9. The wireless sensor device according to claim 1 , wherein the wireless sensor device is used inside the living body.
10. The wireless sensor device according to claim 2 , wherein the wireless sensor device is used inside the living body.
11. The wireless sensor device according to claim 1 , wherein the image pickup device is a CCD or a CMOS sensor.
12. The wireless sensor device according to claim 2 , wherein the image pickup device is a CCD or a CMOS sensor.
13. The wireless sensor device according to claim 1 , wherein the battery is any one of a secondary battery, a thin-film secondary battery or a high-capacity capacitor.
14. The wireless sensor device according to claim 2 , wherein the battery is any one of a secondary battery, a thin-film secondary battery or a high-capacity capacitor.