公开(公告)号：US11360112B2

公开(公告)日：2022-06-14

申请号：US16330423

申请日：2017-08-04

Applicant: HITACHI HIGH-TECHNOLOGIES CORPORATION

Inventor： Masashi Fukaya ,  Eiichiro Takada ,  Takuya Takahashi

IPC: G01N35/10

Abstract: A cleaning water flow velocity during nozzle cleaning is momentarily changed by using a pressure changing mechanism, for example, a syringe. That is, after the start of cleaning, a solenoid valve is opened, and an aspirating operation of the syringe is momentarily performed by a fixed amount in a state where a flow of cleaning water in a nozzle is developed, whereby a nozzle flow velocity is momentarily decelerated. Immediately thereafter, the syringe is pushed back to a home position again, and the flow velocity in the nozzle is accelerated again. A cleaning effect can be improved by performing transition of velocity distribution to various states. Flow velocity control by the pressure changing mechanism can be realized without inhibiting a dispensing cycle, and the cleaning effect of the nozzle can be improved without changing the pressure of a liquid feeding pump or extending the cleaning time.

公开(公告)号：US11009515B2

公开(公告)日：2021-05-18

申请号：US16331583

申请日：2017-08-04

Applicant: HITACHI HIGH-TECHNOLOGIES CORPORATION

Inventor： Takuya Takahashi ,  Hitoshi Tokieda ,  Eiichiro Takada ,  Masashi Fukaya

IPC: G01N35/00 ,  G01N35/10 ,  G01N35/04

Abstract: An automatic analyzer capable of controlling an interval between the tip of a sample nozzle and the bottom of a reaction container regardless of individual differences between reaction containers and sample nozzles and suppressing adhesion of a sample to the sample nozzle is disclosed. Sample nozzles 13a and 14a are moved toward the bottom surface of a reaction container 2, the movement of the sample nozzles is stopped at a point in time when a stop position detector 46 detects a stop position detection plate 45, the sample nozzles are ascended from the stop position to a position where the stop position detection plate 45 separates from a detection range of the stop position detector 46, and an arm 44 is moved upward by a moving distance stored in a memory.

公开(公告)号：US11262371B2

公开(公告)日：2022-03-01

申请号：US16465764

申请日：2017-11-07

Applicant: Hitachi High-Technologies Corporation

Inventor： Masashi Fukaya ,  Shinji Azuma ,  Takuya Takahashi ,  Takumi Ito

IPC: G01N35/02 ,  G01N35/10 ,  G01N1/28 ,  G01N35/04

Abstract: An automatic analyzer controls a sequence including optical measurement and cleaning and includes a discharge mechanism including a discharge nozzle for discharging a liquid into a reaction vessel; and an overflow suction mechanism including an overflow suction nozzle for sucking an overflow amount of the liquid in the reaction vessel. In a liquid discharge step included in a cleaning process and interposed between a preceding step using a detergent and a succeeding blank value measurement step, the automatic analyzer establishes a first state where a lower end of the discharge nozzle is located in a height-wise lower part of the reaction vessel and a lower end of the overflow suction nozzle is located in an upper part of the reaction vessel, and provides control to carry out the discharge of liquid from the discharge nozzle and the suction of the overflow amount of liquid through the overflow suction nozzle.