Abstract: An assembly includes a circuit board, a support perpendicular to the circuit board, and a mounting apparatus including a sliding bracket to accommodate an expansion card, a driving member pivotably mounted to the second support, and a clamping arm mounted to the sliding bracket. The sliding bracket is slidably mounted to the second support, and the driving member is fixed to the sliding bracket. The clamping arm is operable to press or release the expansion card. When the driving member is moved in a first direction, the sliding bracket is moved towards the circuit board, and the expansion card is moved to connect to the circuit board. When the driving member is moved in a second direction opposite to the first direction, the sliding bracket is moved away from the circuit board, and the expansion card disengages from the circuit board.

Abstract: A system and method for communication security receives a request from a first communication device for communication with a second communication device, and determines if the communication is to be secure. The system and method further requests identity verification from the second communication device if the communication is to be secure. In addition, the system and method establishes a secure communication between the first communication device and the second communication device when a valid password is received from the second communication device.

Abstract: A lens system includes, from an object-side to an image-side, a first lens with positive refractive power, an aperture stop, a second lens with positive refractive power, a third lens with negative refractive power, a color filter, and an image plane. The first lens includes a first surface facing the object-side and a second surface facing the image-side. The second lens includes a third surface facing the object-side and a fourth surface facing the image-side. The imaging lens satisfies the following conditions: 0.26<R1/F1<0.35; and ?0.65<R2/F2<?0.35. Wherein: R1 is a radius of curvature of the first surface; R2 is a radius of curvature of the second surface; F1 is a focal length of the first lens; F2 is a focal length of the second lens.

Abstract: An exemplary control key assembly for an electronic device includes a housing and a control key. The housing forms a receiving portion. The receiving portion includes a resisting portion and a hole. The control key is positioned in the receiving portion. The control key includes an operating element and an elastic element. The operating element is received in the hole, and the elastic element includes a bent arm engaging with the resisting portion to limit the movement of the control key.

Abstract: An electronic device includes a body, a rotatable member, a projecting unit configured for projecting an image, a sensing unit and a processing unit. The body includes a connecting end, and a plurality of conductive contacts is formed at the connecting end. The rotatable member is rotatably connected to the connecting end. The rotating member includes a conductive ball configured for being electrically connected to one of the plurality of the conductive contacts, and the plurality of conductive contacts are formed along a displacement path of the conductive ball. The sensing unit is configured for sensing interactions at specific locations corresponding to the projected image. The processing unit stores a plurality of images, and is configured for controlling the projecting unit to project a corresponding image according to the conductive contact which is electrically connected to the conductive ball.

Abstract: A system and method for testing a multimeter provides a mechanical arm to set a gear of the multimeter. Values displayed on the multimeter are captured by a camera. The computer obtains the displayed values from captured images using a difference image method. If a difference between each two obtained values is in an allowable error range of the multimeter, the computer displays that the gear is qualified. If the difference between each two obtained values is not in the allowable error range, the computer displays that the gear is out of tolerance.

Abstract: A control circuit includes a triangular wave generating circuit, a temperature sensing circuit, a first comparator, and a switching circuit. The triangular wave generating circuit outputs a triangular wave signal. The temperature sensing circuit senses a temperature surrounding a fan and outputs a temperature signal. A non-inverting terminal of the first comparator is connected to the triangular wave generating circuit. An inverting terminal of the first comparator is connected to the temperature sensing circuit. The first comparator compares the triangular wave signal with the temperature signal to output a control signal. The switching circuit is connected between a power supply and the fan. The switching circuit turns on or off according to the control signal.

Abstract: A portable electronic device includes a housing, a cover, and a member positioned between the housing and the cover. The housing includes at least one hook. The cover is attached to the housing and includes at least one positioning pin. The member defines at least one locking hole. The hook passes through the locking hole to lock the member to the housing. The positioning pin is positioned adjacent to the hook to prevent the hook from disengaging from the locking hole.

Abstract: An exemplary handheld controller includes a shell, a gas pressure detecting member and a processing unit. The gas pressure detecting member is received in the shell and exposed to the ambient environment. The gas pressure detecting member is configured for detecting a pressure exerted by ambient air at the outside of the shell, and generating a signal relating to the pressure. The processing unit is electrically connected with the pressure detecting member. The processing unit is configured for receiving the signal, identifying a movement of the shell according to the signal, and generating an instruction based on the identified movement.

Abstract: In a light emitting device package and manufacturing method thereof, a multi-layer structure is allocated upon a substrate, of which at least two films with different refractive indices are alternately stacked together.

Abstract: A method of manufacturing a heat sink includes, firstly, providing a plurality of fins each having a head and a body extending from the head, providing a base having a plurality of studs protruding from a top surface thereof, and providing a cover defining a plurality of recesses in a bottom thereof for receiving the heads of the fins and a plurality of orfices for receiving the studs. Next, the cover and the base are pressed to sandwich the heads of the fins therebetween. Then the studs of the base are punched to expand the studs and cause the studs to intimately engage with the cover.

Abstract: A personal digital assistant includes a body, and a touch panel. The body includes a display screen. The touch panel is located on a surface of the display screen. The touch panel includes at least one transparent conductive layer including a carbon nanotube layer.

Abstract: An exemplary hinge assembly includes a sleeve, a first member, a second member, a conductive member and a resilient member. The sleeve includes an open end. The first member is received in the sleeve. The conductive member is positioned on the first member. The second member is located next to the first member. One of the first member and the second member have a cam, the other of the first member and second member have a cam follower interacting with the cam so that the first member rotates about an axis and the second member moves linearly along the axis when the cam follower follows the cam. The resilient member is fitted in the sleeve and provides an elastic force to bias the first member and the second member into contact with each other. A plurality of tabs formed adjacent to the open end contact the conductive member for electronically connecting the sleeve to the first member.

Abstract: A keyboard structure includes a housing having at least one post, a key assembly, and at least one connecting part. The key assembly includes a number of keypads and a keymat, the keymat defining a first through hole, a second through hole and a groove. The connecting part includes a ring, a protruding post and a connecting portion connecting the protruding post to the ring, the connecting part received in the first through hole, the second through hole and the groove, and then fixed on the keymat. The post passes through the key assembly and the ring coils around the post to connect the key assembly to the housing.

Abstract: A universal serial bus battery includes a universal serial bus interface, a battery, a charger, a comparator, a first switch, and a second switch. The comparator is configured for comparing the voltage at the universal serial bus interface and the voltage of the battery, and to produce an ON signal when the voltage at the serial bus interface exceeds the voltage of the battery, or to produce an OFF signal otherwise. The first switch is configured for establishing an electrical connection between the USB interface and the charger upon receiving the ON signal or cutting off the connection upon receiving the OFF signal. The second switch is configured for establishing a connection between the universal serial bus interface and the battery when the connection between the USB interface and the charger is terminated by the first switch.

Abstract: A light emitting diode (LED) backlight driving system drives at least one LED array, and includes a boost power stage circuit, a controller, a multi-channel constant current driving circuit, a voltage dividing circuit, and an offset voltage generating circuit. The boost power stage circuit boosts direct current (DC) power signals to output driving voltage to drive the LED array. The multi-channel constant current driving circuit controls current flowing through the LED array, and outputs regulating voltage to the controller to regulate the driving voltage. The voltage dividing circuit divides the driving voltage to generate feedback voltage to send to the controller. The offset voltage generating circuit generates offset voltage to modify the feedback voltage according to at least one mode selection signal. The controller controls the driving voltage according to the modified feedback voltage and the regulating voltage.

Abstract: A linear voltage regulator circuit includes first and second voltage input terminals to receive a first or second external voltage, a voltage output terminal, a voltage regulator unit, a voltage switch unit, and a voltage detecting unit. The voltage regulator unit selectively receives the first or second external voltage controlled by the voltage switch unit. The voltage detecting unit outputs a first control signal to control the voltage switch unit to output the first external voltage to the voltage regulator unit, in response to an output voltage of the voltage output terminal being less than or equal to a predetermined value. The voltage detecting unit outputs a second control signal to control the voltage switch unit to output the second external voltage to the voltage regulator unit in response to the output voltage being greater than the predetermined value.

Abstract: A removing tool used for removing a removable element from a shielding cover. The removing tool comprises a handle including a first end and a head protruding from the first end, a driving portion mounted on the head, and a pushing portion mounted on the head between the driving portion and the first end. The driving portion is for latching with the removable element; the pushing portion pushes the removable element away from the shielding cover until the removable element separates from the shielding cover.

Abstract: An electronic device includes a base, a cover attached to the base and defining at least one receiving hole and at least one button movably received in one of the at least one receiving hole. The electronic device further includes a printed circuit board fixed to the base, at least one switch and a resilient plate. The at least one switch is arranged on the printed circuit board, each corresponding to one of the at least one receiving hole. The resilient plate cantilevered on the printed circuit board, and includes at least one suspended end abutting against the inner surface of the cover and being under the receiving hole. When being pressed, the at least one button moves inward to urge the suspended end to move downward to actuate the switch.