Abstract: The inventors have discovered that aerodynamic forces contribute to disk fluttering. If the flow of air about these disk surfaces is unstable, the resulting aerodynamic forces can mechanically excite the disk surfaces, causing fluttering. The invention includes media enclosures constraining such aerodynamic effects, methods of making disk drives with these enclosures, the disk drives. This includes disk drives of at most 13 millimeters in height.

Abstract: The inventors have found that by changing the outer wall shape of at least disk spacer, the air flow of the relevant inner region is disrupted, causing particulate adhesion to be minimized. The air flow disruption acts to blow more air through the inner region, effectively moving particles away from the inner region rather than retaining these particles. The inventors call disk spacers with outer wall shapes disrupting inner region air flow, screw-type spacers.

Abstract: Aerodynamic forces contribute to disk and actuator vibration leading to track positioning errors in storage devices such as hard disk drives. The invention provides a variety of dampening mechanisms and a method of dampening to alleviate these problems in single disk storage devices. This includes disk drives of at most 13 millimeters in height.

Abstract: Aerodynamic forces contribute to disk and actuator vibration leading to track positioning errors in storage devices such as hard disk drives. The invention provides a variety of dampening mechanisms and a method of dampening to alleviate these problems.

Abstract: A filtering apparatus for a hard disk drive includes a housing in which a hard disk is rotatably installed, a filter for filtering particles from air flowing in the housing, and a holder installed at the top and bottom of the inside of the housing for supporting the filter by encompassing an upper portion and a lower portion thereof, so that a gap is not generated between the filter and the top, and between the filter and the bottom.

Abstract: A noise damping device for a rotating body and a disk player is disclosed. The noise damping device for a rotating body is characterized in that inner surfaces of a housing in which the rotating body is installed are provided with an intaglio and/or cameo pattern of a predetermined shape. The pattern guides the air flow within the housing smoothly, and damps noise. Also, the noise damping device for a disk player is characterized in that an intaglio and/or cameo pattern of a predetermined shape is formed on surfaces of a disk tray and/or a clamping member.

Abstract: A noise damping device of a rotation driving apparatus includes a housing; and at least one rotating disk installed to be rotated by a driving source within the housing. The rotating disk and the housing are assembled to satisfy the following Equation &dgr;m<h<&dgr;m+1.5&dgr;f &dgr;m is the thickness of air layers which move from the rotation center of the rotating disk to the outside thereof and are distributed around the rotating disk when the rotating disk rotates at a normal operating speed. &dgr;f is the thickness of air layers which move from the outside of the rotating disk to the rotation center thereof and are distributed around the upper inside surface and the base surface of the housing, which face the rotating disk. h is the distance between the rotating disk and the upper inside surface or the base surface of the housing.

Abstract: A noise and vibration damping device of a rotation driving apparatus includes a housing in which a body is rotatably installed, and a driving source that rotates the body. Speed reducing filters are installed on inner surfaces of the housing for reducing the speed of air flow within the housing generated by the rotation of the body.

Abstract: A radiation apparatus of a hard disk drive includes a base frame, a spindle motor installed at the base frame, a hard disk rotatably supported by a rotation shaft of the spindle motor, a cover frame coupled to the base frame and having a hole formed therein, a radiation plate installed at the cover frame and formed of a copper alloy having a thermal conductivity higher than that of the cover frame, and a portion for coupling the rotation shaft and the radiation plate so that driving heat generated by the spindle motor can be directly transferred to the radiation plate.

Abstract: A polygonal mirror assembly is provided with a vibration absorption. The polygonal mirror assembly includes a motor and a polygonal mirror rotatably installed around the rotation shaft of the motor. The polygonal mirror is provided with a plurality of reflective facets. The vibration absorption device is provided for absorbing rotational vibration due to the eccentric mass of the polygonal mirror, by elastically moving in the radial direction of the polygonal mirror. Therefore, the linearity of a scan line scanned from the laser scanning unit to the photoreceptor medium can be maintained.

Abstract: A gamma correction circuit for single-plate type video camera having a correlation double sampling device and receiving the signal output from a complementary-filter-type charge coupled device (CCD) to thereby produce a color line sequence signal, includes a luminance signal detector for detecting the luminance signal frown the color line sequence signal; a first gamma-corrector for performing gamma-correction to the detected luminance signal from the luminance signal detector; a second gamma-corrector for gamma-correcting the color line sequence signal; a color difference signal detector for detecting the color difference signal from the color line sequence signal which is gamma-corrected by the second gamma-corrector; and a mixer for mixing the gamma-corrected luminance signal which is gamma-corrected by the first gamma-corrector with the gamma-corrected color difference signal which is detected by the color difference signal detector.