Patent ID: 8289529
Filing Date: 2012-10-16
Classification: G01N

Abstract:
1. A position detecting method of an analyzing apparatus comprising: an analyzing device having a microchannel structure for transferring a sample liquid to a measurement spot by a centrifugal force; a rotating unit for rotating the set analyzing device; a light source and a photodetector opposed to each other with the set analyzing device disposed between the light source and the photodetector; and a reading device for detecting output light having passed through the measurement spot of the analyzing device, by using the photodetector, the analyzing device including position detection marks, each having one of a reflective surface, a refractive surface, and a light shielding surface that block the output light incident on the photodetector from the light source when the output light reaches a rotation detection position just before or behind the measurement spot, the reading device including a signal processor that extracts the output light just having passed through the measurement spot of the analyzing device and calculates a component of the sample liquid based on a rotation detection signal of the analyzing device and a detection signal of the photodetector, the rotation detection signal being obtained from the rotating unit, the method comprising: rotating the analyzing device by using the rotating unit; counting the rotation detection signals from the starting point position mark; turning on the light source when a number of rotation detection signals reaches a predetermined number; detecting the output light having passed through the analyzing device, by using the photodetector; turning off the light source a predetermined time after the light source is turned on or when the number of rotation detection signals reaches the predetermined number; extracting the position detection mark from the detected signal; and specifying a position of the measurement spot based on the extracted position detection mark and information about a positional relationship between the stored position detection mark and the measurement spot.