Chemical analysis apparatus and chemical analysis method

1. A chemical analysis apparatus comprising an analysis tank and a reaction container in which a sample to be analyzed and a liquid are placed, and sound waves are irradiated to said reaction container so as to agitate said sample and said liquid, said reaction container being positioned within said analysis tank,

wherein said chemical analysis apparatus further comprises a piezoelectric element producing said sound waves, drivers for electrically driving said piezoelectric element to produce said sound waves, a slanted sound wave reflecting means disposed on an internal wall of said analysis tank, opposite to said piezoelectric element with respect to said reaction container, and an optical analyzing unit,

where said piezoelectric element is configured to produce sound waves which include a sound wave irradiated to a liquid surface of the liquid including the sample to be analyzed, laterally of said reaction container, and said slanted sound wave reflecting means is configured to produce a reflected sound wave propagated in a direction below said sound wave and toward a position where no liquid surface is presented, by reflecting said sound wave transmitted through the reaction container by said slanting reflecting means, in the direction below said sound wave, so as to introduce said reflected sound wave again into the reaction container, wherein said sound wave and said reflected sound wave are of a frequency producing an acoustic radiation pressure dominant in a vicinity of a liquid interface of the liquid at the reaction container to induce a circulation flow of said liquid and said sample in said reaction container.

2. A chemical analysis apparatus according to claim 1 , wherein said drivers are adapted to control intermittent irradiation of the sound wave into the reaction container by applying a voltage which is modulated in amplitude from said drivers to said piezoelectric element.

3. A chemical analysis apparatus according to claim 1 , wherein said drivers are adapted to control sinusoidal irradiation of the sound wave into the reaction container by applying a voltage which is sinusoidally modulated in amplitude from said drivers to said piezoelectric element.

4. A chemical analysis apparatus according to claim 1 , wherein said drivers are adapted to control rectangularly-irradiated irradiation of the sound wave into the reaction container by applying a voltage which is rectangularly modulated in amplitude from said drivers to said piezoelectric element.

5. A chemical analysis apparatus according to claim 1 , wherein said drivers comprise a waveform producing device for producing an oscillation waveform having a fundamental frequency of said sound waves to be irradiated, an auxiliary waveform producing device for producing an oscillation waveform having a frequency lower than that of said oscillation waveform, a multiplying circuit for creating a multiplied waveform between both of said waveforms, and a power amplifier for power-amplifying the multiplied waveform.

6. A chemical analysis apparatus comprising an analysis tank and a reaction container in which a sample liquid to be analyzed and a reagent are placed, and sound waves are irradiated to said reaction container so as to agitate and mix said sample liquid and said reagent to form a liquid mixture, said reaction container being positioned within said analysis tank,

wherein said chemical analysis apparatus further comprises a piezoelectric element producing said sound waves disposed proximal to a first side of said reaction container, drivers for electrically driving said piezoelectric element to produce said sound waves, a slanted sound wave reflecting means disposed on an internal wall of said analysis tank, proximal to a side opposite to said first side of said reaction container, and an optical analyzing unit,

where said piezoelectric element is configured to produce sound waves which include a sound wave irradiated to said liquid mixture including the sample liquid to be analyzed from said first side of said reaction container, and said slanted sound wave reflecting means is configured to produce a reflected sound wave propagated in a direction below said sound wave and toward a position where no liquid mixture surface is presented, by reflecting said sound wave transmitted through the reaction container by said slanted reflecting means, in the direction below said sound wave, so as to reintroduce said reflected sound wave into said reaction container, wherein said sound wave and said reflected sound wave are of a frequency producing an acoustic radiation pressure dominant in a vicinity of a liquid interface of the liquid at the reaction container to induce a circulation flow of said liquid mixture.

7. A chemical analysis apparatus according to claim 6 , wherein said drivers are adapted to control intermittent irradiation of the sound wave into said reaction container by applying a voltage which is modulated in amplitude from said drivers to said piezoelectric element.

8. A chemical analysis apparatus according to claim 1 , wherein said drivers are adapted to control sinusoidally modulated amplitude irradiation of said sound wave into said reaction container by applying a voltage which is sinusoidally modulated in amplitude from said drivers to said piezoelectric element.

9. A chemical analysis apparatus according to claim 6 , wherein said drivers are adapted to control rectangularly modulated amplitude irradiation of said sound wave into said reaction container by applying a voltage which is rectangularly moderated in amplitude from said drivers to said piezoelectric element.

10. A chemical analysis apparatus according to claim 6 , wherein said drivers comprise a waveform producing device for producing an oscillation waveform having a fundamental frequency of said sound waves to be irradiated, an auxiliary waveform producing device for producing an oscillation waveform having a frequency lower than that of said oscillation waveform, a multiplying circuit for creating a multiplied waveform between both of said waveforms, and a power amplifier for power-amplifying the multiplied waveform.