Otsuka Electronics Co., Ltd.

Atsushi Toyoshima

Kazunori Tsutsui

Katsuhiro Morisawa

Mitsunao Sekiwa

Takashi Fujimoto

The present invention provides an electrophoretic mobility measuring apparatus capable of conducting measurement with high sensitivity with optical attenuation reduced by incidence of light through the electrode face. This apparatus comprises a transparent electrodeforming a part of a cell wall of a cellcapable of confining a sample, and the other electrodeopposite to the transparent electrode. A voltage is applied across these electrodes, and light is incident upon the inside of the cellthrough the transparent electrode. The scattering light which scatters from a sample S at a predetermined angle &#x3b8; with respect to the incident angle, is received through the transparent electrode. The Doppler displacement is then measured based on the difference in frequency between the incident light and the outgoing light. The direction of the scattering vector which is the vector difference between incident and outgoing vectors, is substantially identical with that of the normal line h of the transparent electrode face.

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Osaka, Japan

Atsushi Toyoshima