1. A control method of a wireless power transmitter for transmitting charging power to a wireless power receiver, the method comprising:
receiving setting information from the wireless power receiver;
determining a load variation of the wireless power receiver for a set time period; and
determining that the wireless power receiver is a charging target, if the load variation of the wireless power matches the received setting information.
2. The method of claim 1, wherein the setting information includes binary data.
3. The method of claim 1, wherein the setting information is information related to a time of a load variation.
4. The method of claim 1, wherein the setting information is information related to a pattern of a load variation.
5. The method of claim 1, after determining the load variation of the wireless power receiver, further comprising:
converting the load variation to binary information; and
comparing the binary information with the received setting information.
6. A control method of a wireless power transmitter for transmitting charging power to a wireless power receiver, the method comprising:
transmitting setting information to the wireless power receiver;
determining a load variation of the wireless power receiver for a set time period; and
determining that the wireless power receiver is a charging target, if the load variation of the wireless power matches the setting information.
7. A control method of a wireless power transmitter for transmitting charging power to a wireless power receiver, the method comprising:
receiving time set information from the wireless power receiver;
determining a load variation of the wireless power receiver for a set time period; and
determining that the wireless power receiver is a charging target, if the load variation of the wireless power matches the received time set information.
8. The method of claim 1, wherein determining the load variation comprises determining the load variation by performing a primary measurement a predetermined first time (\u0394T1) after a time of receiving a signal from the wireless power receiver and performing a secondary measurement a predetermined second time (\u0394T2) later.
9. A control method of a wireless power receiver for receiving charging power from a wireless power transmitter, the method comprising:
transmitting setting information to the wireless power receiver;
changing a load state according to a pattern included in the setting information for a set time period;
receiving information indicating cross charging or non-cross charging from the wireless power transmitter; and
terminating a connection to the wireless power transmitter, if cross charging is determined based on the received information indicating cross charging or non-cross charging.
10. The method of claim 9, wherein the setting information includes binary data.
11. The method of claim 9, wherein the setting information is randomly generated information.
12. The method of claim 9, wherein the setting information includes a plurality of bits.
13. A control method of a wireless power receiver for receiving charging power from a wireless power transmitter, the method comprising:
receiving setting information from the wireless power receiver;
changing a load state according to the setting information for a set time period;
receiving information indicating cross charging or non-cross charging from the wireless power transmitter; and
ending a connection to the wireless power transmitter, if cross charging is determined based on the received information indicating cross charging or non-cross charging.
14. The method of claim 13, wherein the setting information includes binary data.
15. The method of claim 13, wherein the setting information is randomly generated information.
16. The method of claim 13, wherein the setting information includes a plurality of bits.
17. A control method of a wireless power receiver for receiving charging power from a wireless power transmitter, the method comprising:
transmitting time set information to the wireless power transmitter;
changing a load state according to the time set information for a set time period;
receiving information indicating cross charging or non-cross charging from the wireless power transmitter; and
terminating a connection to the wireless power transmitter, if cross charging is determined based on the received information indicating cross charging or non-cross charging.
18. The method of claim 17, wherein the time set information includes binary data.
19. The method of claim 17, wherein the time set information is randomly generated information.
20. The method of claim 17, wherein the time set information includes a plurality of bits.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An elastic wave element comprising:
a piezoelectric body having an upper surface;
an interdigital transducer (IDT) electrode disposed on the piezoelectric body;
a connection wiring disposed on the piezoelectric body and electrically connected to the IDT electrode, the connection wiring including a lower connection wiring and a upper connection wiring disposed above the lower connection wiring; and
a reinforcement electrode disposed above the connection wiring, the reinforcement electrode being in contact with and electrically connected to the lower connection wiring.
2. The elastic wave element of claim 1 wherein the connection wiring includes a hole electrode extending in a direction perpendicular to the upper surface of the piezoelectric body, the reinforcement electrode being electrically connected to the lower connection wiring via the hole electrode.
3. The elastic wave element of claim 2 wherein the hole electrode extends through the upper connection wiring and the lower connection wiring, a first diameter of the hole electrode in the upper connection wiring being larger than a second diameter of the hole electrode in the lower connection wiring.
4. The elastic wave element of claim 1 wherein a material of the lower connection wiring is different from a material of the upper connection wiring.
5. The elastic wave element of claim 4 wherein an oxygen affinity of the material of the lower connection wiring is less than an oxygen affinity of the material of the upper connection wiring.
6. The elastic wave element of claim 1 wherein the reinforcement electrode is in contact with and electrically connected to an upper surface of the lower connection wiring.
7. The elastic wave element of claim 6 wherein the upper connection wiring is divided by the reinforcement electrode in a cross section taken in a direction perpendicular to the upper surface of the piezoelectric body to provide first and second upper connection wirings, the first and second upper connection wirings being electrically connected to each other via the reinforcement electrode.
8. The elastic wave element of claim 7 further comprising a third connection electrode disposed on the piezoelectric body between the first and second upper connection wirings, the third connection wiring being covered with an insulation layer, and the reinforcement electrode extending over the insulation layer.
9. The elastic wave element of claim 7 wherein the lower connection wiring is divided by the reinforcement electrode in a cross section taken in the direction perpendicular to the upper surface of the piezoelectric body to provide first and second lower connection wirings, the first and second lower connection wirings being electrically connected to each other via the reinforcement electrode.
10. The elastic wave element of claim 9 further comprising a third connection wiring disposed on the piezoelectric body between the first and second lower connection wirings, the third connection wiring being covered with an insulation layer, and the reinforcement electrode extending over the insulation layer.
11. The elastic wave element of claim 1 wherein the IDT electrode includes a lower IDT electrode and an upper IDT electrode provided above the lower IDT electrode, a material of the lower IDT electrode being identical to a material of the lower connection wiring, and a material of the upper IDT electrode being identical to a material of the upper connection wiring.
12. A ladder filter including the elastic wave element of claim 1.
13. An elastic wave element comprising:
a piezoelectric body having an upper surface;
a first interdigital transducer (IDT) electrode disposed on the piezoelectric body;
a second IDT electrode disposed on the piezoelectric body;
a connection wiring disposed on the upper surface of the piezoelectric body and electrically connected to the first IDT electrode and the second IDT electrode, the connection wiring including a lower connection wiring and a upper connection wiring disposed above the lower connection wiring; and
a reinforcement electrode disposed above the connection wiring, the reinforcement electrode being in contact with and electrically connected to the lower connection wiring.
14. The elastic wave element of claim 13 wherein the lower connection wiring is formed of a first material and the upper connection wiring is formed of a second material, an oxygen affinity of the first material being less than an oxygen affinity of the second material.
15. The elastic wave element of claim 13 wherein the reinforcement electrode is further in contact with and electrically connected to the upper connection wiring.
16. The elastic wave element of claim 15 wherein the connection wiring further includes a hole electrode extending through the upper connection wiring and the lower connection wiring in a direction perpendicular to the upper surface of the piezoelectric body, the hole electrode having a first diameter in the upper connection wiring and a second diameter in the lower connection wiring, the first diameter being larger than the second diameter, and the reinforcement electrode being electrically connected to the lower connection wiring via the hole electrode.
17. The elastic wave element of claim 13 wherein the connection wiring, including both the upper and lower connection wirings, is divided by the reinforcement electrode in a cross section taken in a direction perpendicular to the upper surface of the piezoelectric body to provide first and second connection wirings, the first and second connection wirings being electrically connected to each other via the reinforcement electrode.
18. The elastic wave element of claim 17 further comprising a third connection wiring disposed on the piezoelectric body between the first and second connection wirings, the third connection wiring being covered with an insulation layer, and the reinforcement electrode extending over the insulation layer.
19. A ladder filter including the elastic wave element of claim 13.
20. An elastic wave element comprising:
a piezoelectric body having an upper surface;
a first interdigital transducer (IDT) electrode disposed on the piezoelectric body;
a second IDT electrode disposed on the piezoelectric body;
a connection wiring disposed on the upper surface of the piezoelectric body and electrically connected to the first IDT electrode and the second IDT electrode; and
means for reducing electric loss in the connection wiring.