Patent ID: 8242433
Filing Date: 2012-08-14
Classification: B01L,Y10T

Abstract:
1. A centrifugal force based microfluidic system comprising: a rotatable platform which comprises a home mark which retro-reflects light incident on the home mark; a motor rotating the platform in a controlled manner; a light-emitting unit emitting the light to a spot of the platform so as to be incident on the home mark only at a point of time when the platform rotates at a predetermined position; a light-receiving unit detecting the incident light that is incident on the home mark and retro-reflected by the home mark; and; a controller determining the home position of the platform based on the retro-reflected light detected by the light-receiving unit, and a mirror which is positioned between the light emitting unit and the platform, wherein the mirror passes the incident light emitted by the light emitting unit so that the light is incident on the platform, wherein the mirror reflects light, which is the retro-reflected light, that is reflected by the home mark towards the light-receiving unit, and wherein the mirror is a mirror with a window or a half mirror, wherein the home mark retro-reflects the light incident on the home mark, so that the retro-reflected light is directed to the light-emitting unit, on a light path which is substantially same as a light path of the incident light.