The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2000
Filed:
Jan. 28, 1999
Hayato Tobe, Mito, JP;
Kazuo Moriya, Hitachinaka, JP;
Hiromi Yamashita, Ishioka, JP;
Yasushi Terui, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An atomic absorption spectrophotometer possessing an electrical heating unit which includes a graphite tube for atomizing a sample by heating the sample; a light emitting unit for emitting measuring light and irradiating the atomized sample with the measuring light; a spectroscope unit for diffracting the measuring light passing the electrical heating unit and selecting the required wavelength component; a detection unit for detecting the quantity of the required wavelength component selected by the spectroscope unit; an input unit to input at least one of the wavelengths of the required wavelength component and the required heating temperature of the electrical heating unit; and a control unit for controlling the above units, which comprises a shading device provided at the propagation axis of the measuring light between the electrical heating unit and the detection unit, and which possesses a light transmitting unit, for restricting the quantity of the measuring light passing the electrical heating unit, with the area of the light transmitting unit being changeable; and wherein the area of the light transmitting unit in the shading device is changed according to the set measurement conditions.