PROBLEM TO BE SOLVED: To provide a signal conversion adapter device that, when a sensor is mounted on a subjects finger tip for example, makes it possible to measure a vascular pulse wave by connecting an optical sensor, instead of a MEMS sensor, to a pulse wave sphygmomanometer device via a sensor cable.SOLUTION: A signal conversion adapter device inserted between a pulse wave measurement device and an optical sensor that includes a light emitting element for, through a skin, emitting light to a blood vessel and a light receiving element for, through the skin, receiving reflected light from the blood vessel or penetration light through the blood vessel and measures a vascular pulse wave of the blood vessel comprises: a drive circuit that drives the light emitting element on the basis of an input drive signal a detection circuit that converts light received by the light receiving element to an electric signal and outputs the electric signal and a feedback capacitor that directly performs synchronous feedback of the electric signal, as the drive signal, to the drive circuit. The signal conversion adapter device generates a self-oscillation signal in synchronization with the vascular pulse wave, from the detection circuit and outputs the self-oscillation signal as a vascular pulse wave signal.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】例えば被測定者の指尖部にセンサが装着された場合において、MEMSセンサに代えて光センサをセンサケーブルを介して脈波血圧計装置に接続して血管脈波を測定することができる信号変換アダプタ装置を提供する。【解決手段】皮膚を介して血管に光を放射する発光素子と、上記血管からの反射光又は上記血管を介した透過光を皮膚を介して受光する受光素子とを含み上記血管の血管脈波を測定する光センサと、脈波測定装置との間に挿入される信号変換アダプタ装置であって、入力される駆動信号に基づいて上記発光素子を駆動する駆動回路と、上記受光素子により受光された光を電気信号に変換して出力する検出回路と、上記電気信号を上記駆動信号として上記駆動回路に直接に同期帰還する帰還キャパシタとを備え、上記信号変換アダプタ装置は、上記検出回路から上記血管脈波に同期する自励発振信号を発生して血管脈波信号として出力する。【選択図】図1
