Abstract: In order to provide an automatic analyzer which ensures accurate absorbance measurement even when ultrasonic wave intensity for agitation of the sample and reagent or the like becomes excessive, multiple reaction vessels 8 are placed as follows: As viewed from the top of the reaction disk 15, the reaction disk 15 is divided into four parts, and the side wall of the reaction vessel 8 does not intersect with two light beams 20 which intersect with each other at right angles. Herein multiple reaction vessels 8 are located at an inclined position approximately at an angle of about 45 deg. This layout allows the reaction vessel 8 to have the surface exposed to ultrasonic wave 22 intersecting to the applied ultrasonic wave appropriately at right angles, and absorbance measuring surface 21 intersecting to the applied measurement wave appropriately at right angles.

Abstract: Multiple piezoelectric elements 35 are arranged in a row along the top of liquid level in a reaction vessel 11. An ultrasonic reflecting material 38 is installed on the bottom of the portion of the heat insulating bath 12 where heat insulating medium 13 is stored. A lateral ultrasonic wave 9b is generated on the lower side by actuation of the piezoelectric element 35. Wave 9b is reflected by the ultrasonic reflecting material 38. As lower ultrasonic wave 8 advances along the wall surface of the reaction vessel, it collides with the specimen liquid, thereby causing a portion of the liquid level closer to the piezoelectric element 35 to be raised. When lateral ultrasonic wave 9a is applied to this portion, it reaches the inclined portion of the raised liquid level of the specimen. Swirling flow by agitation 36 is produced by acoustic radiation pressure of the ultrasonic wave. The specimen and reagent are mixed and agitated by this swirling flow.

Abstract: In order to provide an automatic analyzer capable of ensuring an effective agitation of the reagent and specimen, hence, highly reliable results of analysis, despite small size of the reaction vessel, without carry-over among different specimens, a multiple piezoelectric elements 35 are arranged in a row along the height of liquid level in the reaction vessel 11, and an ultrasonic reflecting material 38 is installed on the bottom of the portion of the heat insulating bath 12 where heat insulating medium 13 is stored. Lateral ultrasonic wave 9b on the lower side is generated by actuation of the piezoelectric element 35 for lateral irradiation located at the bottom. Lateral ultrasonic wave 9b is reflected by the ultrasonic reflecting material 38, and, as lower ultrasonic wave 8, advances along the wall surface of the reaction vessel to collide with the specimen liquid level, thereby causing a part of the liquid level being closer to the piezoelectric element 35 to be raised.

Abstract: Provided is a chemical analysis apparatus comprising a mechanism which can efficiently agitate a substance to be agitated so that a sample and a reagent are agitated and mixed together in a shorter time with a saved consumption power, incorporating a plurality of sound sources or reflecting plates, and a reaction container is located between one of the sound sources and another of the sound sources or one of the reflecting plates, whereby sound waves can be irradiated toward the reaction container in several directions in order to efficiently fluidize a solution in the reaction container.

Abstract: In the automatic analyzer, the height of the test tubes is measured using the function of the optical information reader installed for discrimination of a sample. Various sensors installed so as to measure the height of the test tubes of the automatic analyzer can be omitted and decrease in cost, improvement of reliability, and improvement of maintenance capacity result.

Abstract: In order to provide an automatic analyzer which ensures accurate absorbance measurement even when ultrasonic wave intensity for agitation of the sample and reagent or the like becomes excessive, multiple reaction vessels 8 are placed as follows: As viewed from the top of the reaction disk 15, the reaction disk 15 is divided into four parts, and the side wall of the reaction vessel 8 does not intersect with two light beams 20 which intersect with each other at right angles. Herein multiple reaction vessels 8 are located at an inclined position approximately at an angle of about 45 deg. This layout allows the reaction vessel 8 to have the surface exposed to ultrasonic wave 22 intersecting to the applied ultrasonic wave appropriately at right angles, and absorbance measuring surface 21 intersecting to the applied measurement wave appropriately at right angles.

Abstract: In order to provide an automatic analyzer capable of ensuring an effective agitation of the reagent and specimen, hence, highly reliable results of analysis, despite small size of the reaction vessel, without carry-over among different specimens, a multiple piezoelectric elements 35 are arranged in a row along the height of liquid level in the reaction vessel 11, and an ultrasonic reflecting material 38 is installed on the bottom of the portion of the heat insulating bath 12 where heat insulating medium 13 is stored. Lateral ultrasonic wave 9b on the lower side is generated by actuation of the piezoelectric element 35 for lateral irradiation located at the bottom. Lateral ultrasonic wave 9b is reflected by the ultrasonic reflecting material 38, and, as lower ultrasonic wave 8, advances along the wall surface of the reaction vessel to collide with the specimen liquid level, thereby causing a part of the liquid level being closer to the piezoelectric element 35 to be raised.