PROBLEM TO BE SOLVED: To simply and efficiently drive a piezoelectric pump during the process of pressurization of a cuff.SOLUTION: The amplitude of vibration and the frequency of the voltage applied to a piezoelectric pump is determined by a blood-pressure measurement apparatus (S181, S183, S189, S191, S151, S152, S156 and S157). It is controlled so that the determined amplitude of vibration and frequency may be applied to the piezoelectric pump (S184 and S153). The blood-pressure value is calculated on the basis of the cuff pressure which is detected by a pressure detection part (S154). The amplitude of vibration at a predetermined voltage and the determined control frequency is applied to the piezoelectric pump (S153). The relation between the cuff pressure which is detected by the pressure detection part when the control frequency is changed at the time of application of the predetermined voltage to the piezoelectric pump and a battery voltage is acquired. In a graph showing the acquired relation, the control frequency at a point at a large distance from a graph showing the relation when the control frequency is not changed is determined as the initial control frequency of the pressurization process (S184-S191).COPYRIGHT: (C)2014,JPO&INPIT【課題】カフの加圧過程で簡便に効率よく圧電ポンプを駆動すること。【解決手段】血圧測定装置により、圧電ポンプへの印加電圧の振幅と周波数とが決定され(S181,S183,S189,S191,S151,S152,S156,S157)、決定された振幅および周波数を圧電ポンプに印加するよう制御され(S184,S153)、圧力検出部により検出されるカフ圧に基づき血圧値が算出され(S154)、所定電圧の振幅および決定された制御周波数が圧電ポンプに印加され(S153)、圧電ポンプへ所定電圧印加時の、制御周波数を変化させた場合の圧力検出部によって検出されるカフ圧と電池電圧との関係が取得され、取得された関係を示すグラフにおいて、制御周波数を変化させない場合の関係を示すグラフに対して距離が大きい箇所の制御周波数が、加圧過程の初期制御周波数として決定される(S184~S191)。【選択図】図14
