Patent ID: 7942643

Claim:
A micro fluid pumping device, comprising: a substrate having a pattern which forms two fluid reservoirs and two channels wherein each channel connects one fluid reservoir to the other fluid reservoir; a cover positioned on a top surface of said substrate; a fluid which fills said two fluid reservoirs and said two channels; and a movable light source which generates light and emits the generated light at a predetermined level for moving the fluid from one fluid reservoir to the other fluid reservoir by heating a portion of said fluid adjacent to a gas bubble injected into said fluid in one of the respective two channels through a predetermined sized hole in the substrate and/or the cover, wherein the movable light source moves in parallel with the one of the respective two channels and emits the generated light into the fluid such that the emitted light enters the fluid in a direction that is substantially perpendicular to the fluid by a constant light intensity at all times, thereby the gas bubble moves at a constant speed corresponding to a moving speed of the light beam, wherein a heating temperature for the fluid is controlled by a light intensity of the movable light source and is maintained at a level which induces a capillary pressure difference between ends of the gas bubble.