Abstract: A compensation control circuit of horizontal scanning size suitable to be used in a general monitor to compensate the variation amount of horizontal scanning size due to the influence of the anode load current. The compensation control circuit includes two parts: One is the horizontal scanning size compensation circuit and the other is the horizontal scanning size control circuit. The horizontal scanning size compensation circuit is coupled to the coil of the fly-back transformer to generate a corresponding compensation signal according to the variation of the anode load current. The compensation signal is far lower than the level of the anode voltage. Therefore, it can be processed by the general electric circuits. The horizontal scanning size control circuit is coupled to the horizontal scanning size compensation circuit to receive the compensation signal. The compensation signal can combine with the shift regulation signal sent by the microprocessor to be a D.C. modulation signal. Then the D.C.

Abstract: An improved multiple-width keyswitch capable of inhibiting noise thereof induced during operation is provided. The multiple-width keyswitch includes a keycap and a substrate. During operation, the keycap moves vertically relative to the substrate. The keycap defines a lower surface which is provided with a plurality of bosses. The substrate is provided with a plurality of openings. Each of the plurality of openings is disposed under one corresponding boss and covered with a deformable layer. When the keycap moves downward to turn on the keyswitch, each of the bosses first impacts the deformable layer into the corresponding opening such that the impact energy of the keycap is absorbed by the deformable layer. Thereby the noise induced by the impact of the keycap can be effectively inhibited. Embodiments and equivalent modifications of the invention are described in detail in the specification.

Abstract: A push button switch is provided to include a key cap, a baseplate, a switch element, an internal arm element, an external arm element and an elastic element. The switch element is disposed on the baseplate and made selectively electrically conductive in response to up-and-down motion of the key cap. The internal arm element is movably connected to the baseplate and has a receiving space. The elastic member is disposed within the receiving space and moves responsive to movement of the key cap and selectively actuates the switch element. The improvement of the push button switch is characterized in that the internal arm element, which is movably connected to the baseplate, has a receiving space for accommodating the elastic member. The elastic member moves responsive to movement of the key cap and selectively actuates the switch element.

Abstract: A magnification-variation scanner modifies the resolution merely by changing the object distance and the image distance, with a constant focal distance. The scanner includes a light source, an object lens, an image detector, a holder for carrying the object lens, an optical path delay and a driver. The optical path delay can be located at the midway of the light path from the light source to the object lens, thereby modifying the optical path between the object surface and the object lens. In accompaniment with the movement of the object lens, the dimensions of the image projected over the image detector can be modified. The resolution can therefore be modified. The driver connects between the holder and the optical path delay.

Abstract: A fastener for connectors includes a body consisting of an insert engageable with a socket and a latch member having at least one latch finger along a lateral side of the insert. A latch arm is located outside the latch finger. A wedge motion means is located between the latch member and the latch arm for converting transverse motion of the latch arm to a downward motion of the latch finger for engaging or releasing the insert from the socket.

Abstract: The present invention discloses a dual conversion RF transceiver which uses only one local oscillator for signal conversion to simplify system complexity and reduce production cost. The transceiver comprises a mixer for mixing input RF signals with first local oscillator signal to generate a first IF signal, an IF filter for filtering the first IF signal, a local oscillator for providing second local oscillator signal, a demodulator for demodulating the filtered first IF signal into first baseband signals by using the second oscillator signal, a baseband circuit for processing the first baseband signals and generating second baseband signals to be transmitted, a modulator for modulating the second baseband signals into a second IF signal by using the second local oscillator signal, and a frequency multiplier for multiplying the frequency of the second IF signal by a predetermined factor to generate a output RF signal.

Abstract: This invention relates to a composite antenna used in a radio transceiver, which comprises a first antenna and a detachable antenna set. The first antenna can be used without the detachable antenna set for transmitting and receiving radio signals radiated from the radio transceiver. The detachable antenna set comprises a second antenna for transmitting and receiving radio signals and an antenna sheath electrically connected to the second antenna, for detachably attaching to the first antenna. When the antenna sheath is attached to the first antenna and electrically connected to the signal line and the ground port therein, radio signals transmitted or received by the radio transceiver are confined within the antenna sheath and can be transmitted or received through the second antenna of the detachable antenna set.

Abstract: A monitor shell includes a frame detachably and horizontally mounted to a seat, which is attached to the bottom of a metal housing for holding a cathode-ray tube. A circuit board is mounted on the detachable frame so that it is not necessary to detach the metal housing when repair or maintenance of the circuit board is needed.

Abstract: A scanner includes a bottom cover, a top cover, at least one elastic member, at least one rod, an optical module and at least one spacer. The elastic member is disposed on the bottom cover. The rod is supported by the elastic member. The optical module is movably supported by the rod. The spacer is disposed between the top cover and the rod so that the optical module moves parallel to the top cover.

Abstract: The present invention relates to a method for adjusting the rotating speed of a compact disc drive to prevent unwanted vibrations of a compact disc rotating within. The compact disc drive comprises a reading head for reading data stored in a track of the compact disc and generating a data signal and a track signal; a rotating driver for driving the compact disc; a speed control circuit for controlling the rotating speed of the rotating driver; a track driver for moving the reading head along a diameter of the compact disc; a track driving circuit for controlling the track driver; and a track servo circuit for controlling the track driving circuit according to the track signal generated by the reading head and a track correction gain so that the track driver can move the reading head along the diameter of the compact disc along its track.

Abstract: A disk player is provided to include a tray and a chassis, a traverse and an elastic device. Responsive to an instruction from a user, the tray selectively feeds in and ejects out. The chassis defines an inner side wall and inner bottom wall with the inner side wall extending out at a predetermined location to form a first protrusion and with the inner bottom wall extending out at another predetermined location to form a second protrusion. The first protrusion and second protrusion together defines a space. A traverse has a bracket on which a V-shaped retainer is provided with a first end thereof connected to one end of the bracket. The V-shaped retainer and the first protrusion define a slot in which the elastic device is disposed. The elastic device presses the V-shaped retainer and the first protrusion such that the vibration of the bracket during operation of the disk player is lowered.

Abstract: A jig for testing the printed circuit boards utilizes the adjustable guide members to easily position different sizes of circuit boards on a working plate, wherein the working plate can smoothly slide up and down along the guide columns and the elastic members without jamming. The second surface of the working plate is formed with a concavity and several bulged sections to stably place the circuit board without deformation, and therefore the soldering points of the circuit board can uniformly touch the tips of the probes which are retractably installed in the through holes of the base. By using the assembling base, the maintenance of the internal structure of the base can be improved.

Abstract: The present invention provides a container for a product, which comprises: a bottom portion; side walls connected to edges of the bottom portion; at least one first supporting portion protruding from the bottom portion of the container. The first supporting portion includes at least one convex surface to support the product, at least one concave surface, and a side surface, and both the convex surface and the concave surface are connected to the side surface. When the product is received within the container, the convex surface can support the product, and the product is spaced apart from the concave surface; thus, the cushioning effect of the container is greatly improved.

Abstract: A connecting device connecting a car antenna to the internal circuit of a portable telephone directly without going through a reed or a printed circuit board (PCB) trace. The connecting device is disposed in proximity to the antenna of the portable telephone. The car antenna is coupled to a connector which is to be disposed in a receiving portion formed in proximity to the antenna of the portable telephone. The connecting device includes a circuit board on which an internal circuit is mounted disposed in the portable telephone; a switch element which is electrically connected to the internal circuit and is mounted on the circuit board; and a connecting member mounted on the circuit board. The connecting member can electrically connect the switch element to the connector of the car antenna when the connector is received in the receiving portion and can electrically connect the switch element to the antenna of the portable telephone when the connector is not received in the receiving portion.

Abstract: The present invention discloses a color printer and its printing method for accurately printing different colors on a document. The printer comprises two roller wheels for clamping and carrying the document forward and backward, a stepping motor for driving the two roller wheels, a detector for detecting a front edge of the document, a printing head for printing the document, and a control circuit for controlling operations of the printer. The control circuit comprises a memory for recording the number of steps of the stepping motor as printing position of the document.

Abstract: The present invention relates to an ink ribbon positioning system of a color printer for identifying a position of a color ink ribbon of the color printer. The ink ribbon is windingly installed inside an ink ribbon box comprising a plurality of dye blocks. Each of the dye blocks comprises a plurality of transparent color frames, and the color frames are used for storing different color dyes. The ink ribbon positioning system comprises a light source installed at one side of the ink ribbon for emitting a color light beam through the ink ribbon, an optical sensor for detecting the light beam and generating a corresponding output voltage, and an identification device for identifying positions of a dye block of the ink ribbon and color frames inside the dye block according to output voltages generated by the optical sensor and generating corresponding position signals. The color printer further comprises a thermal print head and a control circuit.

Abstract: A heat-dissipating structure for an electrical device comprises a PC board with a dissipating opening, and an electrical device. The PC board has an upper surface thereof and a lower surface thereof located opposite to the upper surface. The electrical device has a plurality of leads thereof extruding from a bottom surface thereof for anchoring the electrical device on the upper surface of the PC board with a substantial spacing in between. The dissipating opening is located under the electrical device for providing an air convection space to dissipate the heat generated by the electrical device. Also, dissipating plates can be installed above or under the PC board for enhancing the heat-dissipating efficiency.

Abstract: The present invention provides a keyboard comprising a cover plate, a base plate, a metal support, and a thin layer membrane. The cover plate comprises a plurality of supporting structures with a plurality of key caps installed on top and is movable in an up-down vertical direction. The thin layer membrane installed below the cover plate comprises a plurality of switches with each switch underlying a key cap for detecting the operation of the plurality of key caps. The metal support installed under the thin layer membrane strengthens the structure of the keyboard. The base plate is installed under the metal support and comprises a plurality of protruding columns of varying heights to accommodate different metal supports of varying thickness. By supporting the metal support of a specific thickness, the protruding columns of corresponding height help to maintain the thin layer membrane at the specified height between the cover plate and the base plate.

Abstract: The present invention provides a cleaning method which utilizes a cleaning disk to clean a compact disk drive. The compact disk drive comprises a compact disk holder for holding a compact disk, a motor for spinning the compact disk holder, an optical module having an optical lens, a lens driver for driving the optical lens up and down to focus the optical lens on the compact disk, and a radial driver for moving the optical module horizontally. The cleaning disk comprises a cleaning means installed on the cleaning surface of the cleaning disk for cleaning the optical lens. The cleaning method comprises: (1) using the radial driver to drive the optical module to a test region on the cleaning surface and using the lens driver to focus the optical lens on the test region; and (2) using the motor to spin the disk and using the radial driver and lens driver to move the optical lens to interact with the cleaning means so as to clean the optical lens.