Abstract: The present invention discloses a displacer valve for a cryogenic refrigerator, which is mounted on one circular surface of a displacer cover by a bolt to open and close a hole formed in the surface of the displacer cover. The displacer valve includes a rotation preventing guide fastened to an eccentric portion of the displacer cover by the bolt to prevent the displacer valve from rotating around the bolt. Therefore, the displacer valve does not rotate around the bolt but is fixed in a proper position, so that its operational reliability can be ensured.

Abstract: The present invention discloses a compressor including a hermetic container into/from which refrigerant is sucked and discharged, a compression unit provided in the hermetic container and compressing the refrigerant, a motor unit provided in the hermetic container to be connected to the compression unit and driving the compression unit, and one or more irregular reflection portions provided on an outer circumferential surface of the motor unit. The irregular reflection portion repeatedly reflects and dissipates noise and vibration in the compressor to improve the noise reduction effect. In addition, the irregular reflection portion increases the surface area of the motor unit to improve the radiation effect, which results in high efficiency of the entire compressor.

Abstract: A multi-module combination type portable electronic device includes a display module having a display unit to display an image, a control module having a plurality of buttons, and a connection unit to connect the display module and the control module, thereby transmitting a data signal and power from the control module to the display module, and thus, enabling use in a plurality of modes according to a combination position of the display module and the control module.

Abstract: A compressor is provided. The compressor includes a motor that generates power to rotate a crank shaft. The motor includes a rotor rotating about a stator supported in a hermetic vessel by an elastic member. A roller is provided eccentric to the center of rotation of the crank shaft and rotates eccentrically to divide the compression chamber into two regions with a vane so as to allow working fluids to be drawn into, compressed discharged from the compression chamber. A compressor so configured minimizes fluidity and friction losses, thereby improving compression efficiency. The working fluids do not have influence upon/from the inside of are not influenced by an environment with the hermetic vessel, and vibration is minimized, thus enhancing compression efficiency and reducing associated noise.

Abstract: A method for manufacturing a planar optical waveguide, includes the steps of coating, over a lower cladding layer, an optical waveguide layer including an inorganic-organic matrix uniformly doped with photosensitive photochemical monomers, selectively exposing the waveguide layer to a beam with a predetermined range of wavelengths so as to immobilize the doped photochemical monomers, and thermally treating the waveguide layer to remove unexposed monomers and cure the exposed optical waveguide layer. Requiring no etching processes, the method can reduce the number of processing steps and produce a planar optical waveguide with a low optical loss.

Abstract: A hermetic type compressor includes an exhaust valve installed in a reentrant groove formed in a head for opening or shutting an exhaust hole, a valve spring for elastically supporting the exhaust valve, a retainer for restricting the exhaust valve and valve spring by a constant position, and a valve fixing device for fixing the exhaust valve in a fixing part, wherein the valve spring and valve fixing device are integrally formed between the head and head cover. Thus, the structure of the device is simplified, thereby improving the productivity and saving the manufacturing cost. Also, since the exhaust valve and valve spring are strongly fixed, thereby efficiency of the compressor.

Abstract: An improved exhaustion noise suppressing apparatus for a hermetic compressor directed to minimizing vibration of a refrigerator cycle pipe mechanism caused by a pressure difference of an exhausting gas pressure of the exhausting gas which is discharged from the system to the outside of the compressor by providing a damping member for offsetting a pressure wave form of the refrigerant gas to one side of the interior of the exhaustion noise suppressing unit wherein the compressed refrigerant gas discharged from the cylinder and the exhausting chamber is introduced into the loop pipe through the head cover and the exhaustion noise suppressing unit.