MICRO-PUMP AND CHEMICAL ANALYZER

摘要

PROBLEM TO BE SOLVED: To increase the leakage angle of a liquid relative to a discharge face at the instant when the liquid is discharged and separated from a discharge port and improve the shutoff property of the liquid immediately after the discharge is completed by forming a groove around the discharge port on the discharge face including the discharge port of the liquid on a discharge nozzle section. SOLUTION: A discharge nozzle 101 is provided at the center section of a nozzle substrate 100. The discharge nozzle 101 is constituted of a discharge port 110 discharging or dripping a liquid and a bank 113 formed as a projection 113, and an inlet 111 is provided on the liquid entering side of the nozzle substrate 100. A groove 112 is formed around the discharge port 110. A half or above of the thickness of the nozzle substrate 100 is enough for the depth of the groove 111 in consideration of the strength of the discharge nozzle 101, and the reduction of discharge precision and stains around the discharge port 110 caused by the sticking of the liquid can be prevented. Discharge resolution and discharge stability can be improved without requiring periodic disassembling and cleaning.