STIRRER,VESSEL, AND ANALYZER

1 . A stirrer for stirring a liquid retained in a vessel with a sonic wave, comprising:

a sonic wave generating unit, including plural sound generators each having a different resonance frequency, for emitting the sonic wave generated from the sound generator toward the liquid; and

a drive control unit for switching the sound generator which generates the sonic wave to a specific sound generator among the plural sound generators by changing a frequency of a drive signal input to the sonic wave generating unit.

2 . The stirrer according to claim 1 , wherein

the drive control unit changes a position of the sound generator which emits the sonic wave or a number of the sound generators which emits the sonic wave, according to the frequency of the drive signal.

3 . The stirrer according to claim 1 , wherein

the drive control unit changes the frequency of the drive signal based on received information about an inspection item of the liquid, a property of the liquid, or the amount of the liquid.

4 . The stirrer according to claim 1 , wherein

the drive control unit causes a series of flow in the liquid by controlling an order of switching the sound generator emitting the sonic wave to the specific sound generator.

5 . The stirrer according to claim 4 , wherein the series of flow is a swirl.

6 . The stirrer according to claim 4 , wherein

the liquid contains at least a first liquid and a second liquid that is less than the first liquid, and

the series of flow is a flow for drawing the second liquid into the first liquid.

7 . The stirrer according to claim 1 , wherein

the drive control unit switches the sound generator emitting the sonic wave by driving the plural sound generators at a different timing.

8 . The stirrer according to claim 1 , wherein

one of the plural sound generators emits the sonic wave in the different directions by 90°.

9 . The stirrer according to claim 8 , wherein

a direction of the sonic waves emitted this time from the plural sound generators is different from a direction of the sonic wave emitted last time from the plural sound generators by 90°.

10 . The stirrer according to claim 1 , wherein

the drive control unit simultaneously inputs drive signals each having the same drive frequency to the plural sound generators.

11 . The stirrer according to claim 1 , wherein

the drive control unit drives the plural sound generators in an order of switching the sound generator to the specific sound generator, and then, drives the plural sound generators in an order different from the switching order.

12 . The stirrer according to claim 1 , wherein

the sonic wave generating unit receives the drive signal from a set of input units.

13 . The stirrer according to claim 12 , wherein

the sound generator of the sonic wave generating unit is switched to the sound generator emitting the sonic wave among the plural sound generator by a self-selection caused due to change in the frequency of the drive signal by the drive control unit.

14 . The stirrer according to claim 1 , wherein

the plural sound generators are arranged so as to be adjacent to each other or apart from each other.

15 . The stirrer according to claim 14 , wherein

the resonance frequency is discontinuously changed in the plural sound generators.

16 . The stirrer according to claim 14 , wherein

the resonance frequency is continuously changed in the plural sound generators.

17 . The stirrer according to claim 1 , wherein

the drive control unit changes the frequency of the drive signal input to the sonic wave generating unit over a band including different resonance frequency.

18 . The stirrer according to claim 1 , wherein

the sonic wave generating unit is a surface acoustic wave device having a piezoelectric substrate and plural inter digital transducers, and the plural sound generators are the plural inter digital transducers.

19 . The stirrer according to claim 18 , wherein

some or all of the plural inter digital transducers are arranged so that distances between the inter digital transducers on the piezoelectric substrate are different from each other.

20 . The stirrer according to claim 1 , wherein

the sonic wave generating unit is a thickness-mode transducer having a piezoelectric substrate whose thickness increases in one direction and an electrode mounted on both surfaces of the piezoelectric substrate.

21 . The stirrer according to claim 1 , wherein

the sonic wave generating unit is arranged at a position apart from the liquid.

22 . The stirrer according to claim 1 , wherein

the drive control unit changes a frequency of a drive voltage or drive current that is the drive signal input to the sonic wave generating unit.

23 . A vessel retaining a liquid that is stirred by a sonic wave, comprising:

a sonic wave generating unit, having plural sound generators each having a different resonance frequency, wherein the sound generator generating a sonic wave emitted to the liquid is switched to a specific sound generator among the plural sound generators by change in the frequency of the drive signal.

24 . The vessel according to claim 23 , wherein the drive signal is input from a set of input units.

25 . An analyzer that stirs and reacts a liquid sample including a specimen and a reagent retained in a vessel so as to analyze a reaction solution, comprising a stirrer for stirring the liquid sample retained in a vessel with a sonic wave, wherein the stirrer includes

a sonic wave generating unit, including plural sound generators each having a different resonance frequency, for emitting the sonic wave generated from the sound generator toward the liquid sample; and

a drive control unit for switching the sound generator which generates the sonic wave to a specific sound generator among the plural sound generators by changing a frequency of a drive signal input to the sonic wave generating unit.