An abrasion preventing device for a hermetic reciprocating compressor. The device releases the impact generated between the slider and the shell of the compressor, thus to prevent possible abrasion of the contact part between the slider and the shell as well as abrasion of the piston. The device comprises a cylinder and a piston received and reciprocating in the cylinder, an end of the piston having a coupling projection. A shell, which is coupled to the piston, has a coupling projection. A bolt...

A wide-angle zoom lens system includes a first lens group having a positive refractive power and a second lens group having a negative refractive power and spaced from the first lens group at a first distance, the first distance being variable during zooming. The first lens group includes a first lens having a positive refractive power and a convex surface toward an object, a second lens having a negative refractive power and concave surfaces, a third lens having a positive refractive power and ...

A harmonic current attenuating device of a motor for attenuating a harmonic current generated from the motor by controlling the rotation speed by varying a sine wave voltage into a non-sinusoidal wave by phase-controlling the sine wave voltage, comprises a reactor having an E shape core, a coil wound to the E shape core and an I shape core.

A serial/parallel selective converter is provided that selectively receives and outputs data by using a plurality of serial input/output switching latches and a plurality of parallel input/output switching latches. The serial/parallel selective converter can further include three sets of transmission gates respectively coupling the plurality of serial input/output switching latches and the plurality of parallel input/output switching latches. The serial/parallel selective converter can output a ...

For fabricating a flash memory cell, a dummy gate structure is formed on an active device area of a semiconductor substrate. A drain bit line junction is formed within the active device area of the semiconductor substrate to a first side of the dummy gate structure, and a source bit line junction is formed within the active device area of the semiconductor substrate to a second side of the dummy gate structure. A drain bit line silicide is formed within the drain bit line junction, and a source ...

A power supply capable of compensating a failed voltage occurred therein includes an exclusive OR gate for performing an exclusive OR operation on a first and a second voltages to produce a failure detection signal to indicate a failure in either of a first or a second voltage source, wherein a level of the first voltage is higher than that of the second voltage, a voltage conversion device for converting the first voltage applied thereto to an equivalent to the second voltage and a switching tr...

A wide-angle variable magnification viewfinder comprises from an object side: an objective lens group of a positive refractive power, including a fixed first lens unit of a negative refractive power, a movable second lens unit of a negative refractive power for compensating the change of a view angle, a movable third lens unit of a positive refractive power for changing the magnification of the optical system, a prism for erecting an image, a fixed fourth lens unit of a positive refractive power...

A super wide-angle variable magnification viewfinder includes an objective lens group of a positive refractive power. The objective lens group further includes a fixed first lens unit of a negative refractive power, a movable second lens unit of a negative refractive power for compensating the change of a view angle, a movable third lens unit of a positive refractive power for changing the magnification of the optical system, and a fixed fourth lens unit of a positive refractive power. Also incl...

A slider of a closed-type compressor in which friction and abrasion of an inside circumferential surface of a slider shell and an outside circumferential surface of the slider can be reduced by forming a circular arc at both portions where the outside circumferential surface of the slider contacts the inside circumferential surface of the slider shell. The slider of the closed-type compressor has a circular arc portion at the inside portion of both ends of the outside circumferential surface of ...

A concentricity processing apparatus and method employ a vision system to achieve precision-machining of products, even those having minute, tapered or complex-shaped inner diameters. The concentricity processing apparatus includes: a loading unit for loading the product or subject to be processed; a photographing unit for photographing the section of the subject to be processed as loaded into the loading unit; a display unit for displaying a section of the subject to be processed as photographe...