Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
MAGNETIC-FIELD MEASUREMENT DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/011477
Kind Code:
A1
Abstract:
The disclosed magnetic immunoassay device, which performs magnetic immunoassays using antigen-antibody reactions, can perform speedy immunoassays without bound/free separation in the test samples. Said device is also practical, being capable of stable magnetism measurement without magnetic shielding. The disclosed magnetic immunoassay device is provided with: an excitation coil that uses an AC magnetic field to magnetize a test sample containing a magnetic marker; a magnetism sensor that measures magnetism in the test sample and outputs a magnetism signal; and a displacement sensor for detecting changes in the distance between the test sample and the magnetism sensor. By optimally setting the bandwidth of a lock-in amplifier, which detects changes in the phase of the magnetism signal outputted by the magnetism sensor, and the rotational speed produced by a drive system, which moves the test sample at low speeds, the impact of environmental magnetic noise is reduced, and correcting the magnetism signal using distance information obtained from the displacement sensor allows stable magnetism measurement.

Inventors:
KAWABATA Ryuzo (HITACHI LTD., 280, Higashikoigakubo 1-chome, Kokubunji-sh, Tokyo 01, 〒1858601, JP)
川畑 龍三 (〒01 東京都国分寺市東恋ヶ窪一丁目280番地 株式会社日立製作所 中央研究所内 Tokyo, 〒1858601, JP)
MIZOGUCHI Takako (HITACHI LTD., 280, Higashikoigakubo 1-chome, Kokubunji-sh, Tokyo 01, 〒1858601, JP)
溝口 崇子 (〒01 東京都国分寺市東恋ヶ窪一丁目280番地 株式会社日立製作所 中央研究所内 Tokyo, 〒1858601, JP)
TSUKAMOTO Akira (HITACHI LTD., 280, Higashikoigakubo 1-chome, Kokubunji-sh, Tokyo 01, 〒1858601, JP)
Application Number:
JP2011/066389
Publication Date:
January 26, 2012
Filing Date:
July 19, 2011
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HITACHI, LTD. (6-6 Marunouchi 1-chome, Chiyoda-ku Tokyo, 80, 〒1008280, JP)
株式会社日立製作所 (〒80 東京都千代田区丸の内一丁目6番6号 Tokyo, 〒1008280, JP)
KAWABATA Ryuzo (HITACHI LTD., 280, Higashikoigakubo 1-chome, Kokubunji-sh, Tokyo 01, 〒1858601, JP)
川畑 龍三 (〒01 東京都国分寺市東恋ヶ窪一丁目280番地 株式会社日立製作所 中央研究所内 Tokyo, 〒1858601, JP)
MIZOGUCHI Takako (HITACHI LTD., 280, Higashikoigakubo 1-chome, Kokubunji-sh, Tokyo 01, 〒1858601, JP)
溝口 崇子 (〒01 東京都国分寺市東恋ヶ窪一丁目280番地 株式会社日立製作所 中央研究所内 Tokyo, 〒1858601, JP)
International Classes:
G01N27/74; G01N33/543
Attorney, Agent or Firm:
POLAIRE I.P.C. (7-1 Hatchobori 2-chome, Chuo-ku Tokyo, 32, 〒1040032, JP)
Download PDF:
Claims:



 
Previous Patent: AGITATING SNOW-MELTING DEVICE

Next Patent: PUNCHING DIE