Abstract: A voltage test circuit for testing a computer power supply includes a voltage input unit configured for receiving voltages from the computer power supply, a voltage output unit configured for outputting the voltages to a plurality of electrical loads, a test unit, a switch control unit, and a capacitive load module. The test unit is connected between the voltage input unit and the voltage output unit for testing output ripple and noise of the voltages. The capacitive load module includes a plurality of capacitive loads. The switch control unit is connected between the voltage input unit and the capacitive module for selecting a suitable capacitive load according to the computer power supply.

Abstract: A backlight module includes a light source and a light guide plate. The light guide plate includes a base plate and a reflecting film. The base plate has an upper surface on which a plurality of protrusions is formed, a curved bottom surface opposite to the upper surface, and a housing defined therein. The light source is accommodated in the housing. The reflecting film is plated on the curved bottom surface, for reflecting the light beams reaching the curved bottom surface to emit from the upper surface. The plurality of protrusions diffuses light beams.

Abstract: A backlight module includes a light source and a light guide plate. The light guide plate has a side surface adjacent the light source for entry of light beams from the light source, a bottom surface perpendicular to the side surface, a plurality of identical protrusions formed on the bottom surface, and a reflecting film plated on the bottom surface and the plurality of identical protrusions. The identical protrusions diffuse the light from the light source out of an upper surface of the light guide plate, which is opposite to the bottom surface. The reflecting film reflects the light leaking from the bottom surface back to the light guide plate.

Abstract: A system for testing power supply performance is provided. The system includes a power supply having a plurality of outputs for outputting voltages, a plurality of display units corresponding to the plurality of outputs, for reflecting performance of the power supply, a plurality of resistance-matching selectors corresponding to the plurality of outputs, for supplying selective resistance, a voltage adjustable direct current source, and a selective switch. The display units are connected between first terminals of the outputs and the resistance-matching selectors, respectively. The resistance-matching selectors are in turn connected to ground. The voltage adjustable direct current source has a pole selectively connected to a second terminal of one of the outputs via the selective switch, and another pole grounded.

Abstract: A solenoid test device includes a clock circuit, a control circuit, and an output port configured for coupling to two ends of a solenoid. The clock circuit generates a clock signal and sends it to the control circuit. The control circuit periodically and alternately couples one of the two ends of the solenoid to ground via the output port under the control of the clock signal. The solenoid test device is used to generate a periodic control signal to test service life and stability of solenoids.

Abstract: A voice coil motor apparatus for positioning is disclosed. The voice coil motor is used by the auto-focus lens control module of a miniature camera. The apparatus contains a voice coil motor, a position feedback sensor, and a positioning controller. The voice coil of the voice coil motor can be either movable or stationary, where in the former case the attached power cable is a flexible circuit board, and in the latter case the power cable is fixed. The position feedback sensor includes a photo interrupter, a light reflector, and a bias circuit used for tracking any displacement of the movable part of the motor. The positioning controller uses the voltage signals to be processed through a proportional-integral-differential computation unit to manipulate an output current for accurate positioning of the movable part of the motor within a prescribed range.

Abstract: The present invention proposed a voice coil motor and a method of using magnetic restoring force for displacement control. The voice coil motor comprises a magnetic member and an electric member. The magnetic member generates a magnetic field. The electric member includes at least a coil and a ferromagnetic component. The coil can generate thrust when current is applied, and the ferromagnetic component can generate magnetic restoring force and normal coupling force. The voice coil motor further includes a suspension member, and is characterized in that the normal coupling force can preload the suspension member to eliminate the tilt angle and free play. Through the balance between the thrust generated by the coil current and the magnetic restoring force, open-loop displacement control can be accomplished without any elastic component.

Abstract: A hinge positioning structure is used to couple a body and a leg of a stand. The hinge positioning structure has a joint groove formed in the body, a stopper attached at the bottom of the joint groove having an elastic body with a spring strip, and a hinge formed in the leg positioned in the joint groove. The leg has two sides, each side having a pivot positioned according to a corresponding pivot hole in the joint groove for rotatable insertion into the corresponding pivot hole of the joint groove, and two flanges, each flange parallel to the spring strip and radially protruding a first height sufficient to contact with the spring strip for generating a resistance.

Abstract: The present invention provides a luminance auto-adjustment device for the display, which comprises a light source-detecting module and a voltage modulation module, which are set in the power control circuit of the rear-projection fluorescent tube of the display. The light source-detecting module is used to sense the external luminance, based on which the voltage modulation module is used to modulate the voltage value of the rear-projection fluorescent tube. The rear-projection fluorescent tube of the display can automatically modulate the luminance according to the external luminance.

Abstract: The present invention discloses a voice coil motor apparatus, especially one applied to an auto-focus or variable-focus lens module of a miniaturized camera. The voice coil motor apparatus of the present invention comprises: a voice coil motor, a plurality of steel guidance shafts, a lens holder, and a base. The voice coil motor includes a magnetic part, which further comprises magnets and yokes, and an electrical part, which further comprises a coil winding. The magnetic part is rigidly coupled to the lens holder to form the moving member of the apparatus. The electrical part and the steel guidance shafts are fixed on the base to form the non-moving member.

Abstract: A loading device for a disk driver includes a transporting unit and a guide unit. The transporting unit includes one roller or two rollers, and the guide unit includes two symmetric or asymmetric cones. When loading a disc, two sides of the disc are individually supported on two cones of the guide unit. Two cones have different cone angles, equal cone angles but unequal lengths, or the same shape but different rotation velocities. The guide unit utilizes different arc speeds on two ends to obliquely convey the disc with any guide rails. The loading device reduces the cost of production and prevents the disc from generating collision and noisy.

Abstract: A voice coil motor apparatus for positioning is disclosed. The voice coil motor is used by the auto-focus lens control module of a miniature camera. The apparatus contains a voice coil motor, a position feedback sensor, and a positioning controller. The voice coil of the voice coil motor can be either movable or stationary, where in the former case the attached power cable is a flexible circuit board, and in the latter case the power cable is fixed. The position feedback sensor includes a photo interrupter, a light reflector, and a bias circuit used for tracking any displacement of the movable part of the motor. The positioning controller uses the voltage signals to be processed through a proportional-integral-differential computation unit to manipulate an output current for accurate positioning of the movable part of the motor within a prescribed range.

Abstract: A system having a mother board with a PCI controller and an AGP connector formed thereon is provided. Part of the electric contacts within the AGP connector is connected to the PCI controller and the rest contacts are opened.

Abstract: A magnet assembly including a metal cap, a cylindrical body and a magnet. The metal cap is comprised of a concave portion at the top and a convex portion at the bottom. The convex portion may just fit into a slot formed at an upper side of the cylindrical body and be secured therein. A groove is provided at an inner side of the lower portion of the cylindrical body for receiving the magnet such that the magnet may partly project therefrom. The projecting part of the magnet may fit into the concave portion of the metal cap of another magnet assembly. By means of the configuration of the magnet assembly, a plurality of magnet assemblies may be piled up in a neat stack and stuck to a metallic board.

Abstract: A foldable tent frame includes a parallelepiped structure comprised of a rectangular front sub-frame having four front poles rotatably connected at four front corner members and a rectangular rear sub-frame having four rear poles rotatably connected at four rear corner members and four length-adjustable horizontal poles which are respectively rotatably connect between the front and rear corner members. Each front pole has two sections pivotally connected to a front joint member and each rear pole has two sections detachably connected a rear joint member. Four reinforcing bars respectively rotatably connected to the rear corner members extend diagonally to pivotally joint to a common central joint which includes two halves rotatably relative to each other. A brace pole, comprised of two sections detachably jointed by a joint member, is oriented upright and pivoted at two opposite ends thereof to every two horizontal poles.

Abstract: A collapsible closet frame includes two upright front posts and two upright rear posts connected together at both their upper ends and lower ends with two pairs of parallel horizontal bars by means of corner members in a pivotable manner so as to form a parallelepiped structure. At each of the upper and lower ends of the rear posts, a brace is mounted and extending toward a brace joint to pivot thereto.

Abstract: A playpen frame structure comprising a rectangular top rail frame supported by four upright legs. Each side of the top rail includes a joint in its center to allow the frame to collapse. A reinforcement structure is provided on the lower ends of the supporting legs comprising reinforcement bars extending diagonally from the lower ends of the legs and pivotally connected to a central member.

Abstract: A playpen frame structure comprises a rectangular top rail frame supported by four upright primary legs. The top rail frame comprises four rails, each constituted by two bar members pivotally connected to a mid-joint which allows the bar members to be rotatable about pivots mounted on the mid-joint. A retaining member is provided on each of the mid-joint to form a releasable retaining engagement with the two bar members to maintain the bar members in the expanded condition. The retaining member comprises release button for breaking the retaining engagement. There is also provided a reinforcement structure on the lower ends of the primary legs to hold the legs in position and thus avoid accident collapses of the legs.

Abstract: The present invention provides an automatic control system for position following and reciprocating motion of a controlled object. By using a specially designed controlling switch, and a pair of variable resistor for varying the position of the demanding object, the position of the controlled object and its motion pattern may be controlled. Using the automatic control system of the present invention, the motion characteristics of best deceleration rate for the controlled object may be obtained. And the automatic system of the present invention may improve the disadvantages of the conventional position control device contributes a perfectly ideal automatic control for the motor-operated or hydraulically-operated mechanism.