Abstract: A micro air delivery device for supplying air to a predetermined space, comprises a jet unit for obtaining and delivering outside air; a cover having a discharge orifice for discharging the outside air delivered from the jet unit; and a base unit connected to the jet unit. Since a valve is not employed to regulate the air supply or delivery, the air delivery device is superior in safety, is of simplified construction, and efficient. Furthermore, the air flow can be controlled by varying the electric current or the frequency, and accordingly, an active delivery of the air is possible.

Abstract: Optical transmission structures include a waveguide and an optical lens wherein the optical lens has a sufficiently large thickness to allow the formation of a curved front lens surface that collimates transmitted light rays so that they travel within a plane that is coplanar to a working surface. The present invention also relates to a technique for manufacturing the optical transmission structure, which involves the use of a photopolymer material. The optical transmission structure can be implemented in various systems such as a system for optical data input.

Abstract: A fuel supply device for direct methanol fuel cells includes a fuel tank for storing liquid fuel, a cavity plate formed on the fuel tank, the cavity plate storing liquid fuel transferred from the fuel tank, and a nozzle plate formed on the cavity plate, the nozzle plate ejecting upwardly the liquid fuel stored in the cavity plate, wherein a fuel tank body of the fuel tank includes a bellows type vessel capable of contracting and expanding. Accordingly, it is possible to actively control an amount of liquid fuel supplied by the fuel supply device to a fuel cell while minimizing electric power consumption, and to effectively remove by-products, thereby improving efficiency of the fuel cell.

Abstract: A micro-accelerometer includes first and second closed cavities, into each of which an equal quantity of gas is introduced. A membrane partitions the symmetrical first and second cavities. Temperature sensors are provided within the first and second cavities, respectively, to measure the gas temperatures within the cavities. Difference of temperature is not caused so long as no acceleration affects the inner side of the cavities. However, if a linear acceleration is applied, the membrane is deformed in the direction of acceleration, whereby for example, the gas within the first temperature is compressed and its temperature increases, whereas the temperature of the second cavity decreases because the gas is expanded within the second cavity. The difference of gas temperatures between the first and second cavities is measured as a variation of electric power resistance by the temperature sensors and applied as a function of acceleration.

Abstract: A micro-accelerometer includes first and second closed cavities, into each of which an equal quantity of gas is introduced. A membrane partitions the symmetrical first and second cavities. Temperature sensors are provided within the first and second cavities, respectively, to measure the gas temperatures within the cavities. Difference of temperature is not caused so long as no acceleration affects the inner side of the cavities. However, if a linear acceleration is applied, the membrane is deformed in the direction of acceleration, whereby for example, the gas within the first temperature is compressed and its temperature increases, whereas the temperature of the second cavity decreases because the gas is expanded within the second cavity. The difference of gas temperatures between the first and second cavities is measured as a variation of electric power resistance by the temperature sensors and applied as a function of acceleration.

Abstract: A micro air delivery device for supplying air to a predetermined space, comprises a jet unit for obtaining and delivering outside air; a cover having a discharge orifice for discharging the outside air delivered from the jet unit; and a base unit connected to the jet unit. Since a valve is not employed to regulate the air supply or delivery, the air delivery device is superior in safety, is of simplified construction, and efficient. Furthermore, the air flow can be controlled by varying the electric current or the frequency, and accordingly, an active delivery of the air is possible.

Abstract: A fuel supply device for direct methanol fuel cells includes a fuel tank for storing liquid fuel, a cavity plate formed on the fuel tank, the cavity plate storing liquid fuel transferred from the fuel tank, and a nozzle plate formed on the cavity plate, the nozzle plate ejecting upwardly the liquid fuel stored in the cavity plate, wherein a fuel tank body of the fuel tank includes a bellows type vessel capable of contracting and expanding. Accordingly, it is possible to actively control an amount of liquid fuel supplied by the fuel supply device to a fuel cell while minimizing electric power consumption, and to effectively remove by-products, thereby improving efficiency of the fuel cell.