Abstract: A limiting structure is used for a foldable electronic device including a cover and a body. The limiting structure includes a receiving portion formed in the cover, a latching element, a support element and an elastic element. The receiving portion defines a notch and a holding portion. The latching element is fixed to the body. The support element defines a cutout. The cutout is aligned with the notch. The latching element is received in the cutout and the notch. The elastic element surrounds the support element. The cover is opened relative to the body, and the latching element is latched with the holding portion.

Abstract: A 360 degree viewing angle lens unit, from the object side to the image side thereof, includes a 360 degree viewing angle lens and a relay lens. The viewing angle lens includes an annular incident surface, a first reflective surface, a second reflective surface, and an emitting surface. The annular incident surface has a positive radius of curvature and symmetrically concentric around an optical axis of the lens unit. The first reflective surface has a positive radius of curvature and is symmetrically concentric around the optical axis. The second reflective surface has a negative radius of curvature, and is coaxial with the incident surface. The emitting surface has a positive radius of curvature and is coaxial with the first reflective surface. The relay lens has a positive refractive power and is aligned with the emitting surface. The relay lens is configured for condensing image light output from the emitting surface.

Abstract: A keyboard includes a main body and a support in the main body. The main body includes a bottom defining two slots and two opposite sidewalls each defining a receiving hole. The slots communicate with the receiving holes, respectively. The support includes a rotation member, two driving members and two connecting members received in the two slots, respectively. Each connecting member includes a first arm and a second arm, wherein two ends of the first arm are rotatably connected to the rotation member and the second arm, respectively, the second arm is further rotatably connected to one of the driving members, and the second arm moves together with the one of the two driving members, causing the connecting ends of the first arm and the second arm to extend out of one of the two slots.

Abstract: A method for manufacturing a field electron emission source includes: providing an insulating substrate; patterning a cathode layer on at least one portion of the insulating substrate; forming a number of emitters on the cathode layer; coating a photoresist layer on the insulating substrate, the cathode layer and the emitters; exposing predetermined portions of the photoresist layer to radiation, wherein the exposed portions are corresponding to the emitters; forming a mesh structure on the photoresist layer; and removing the exposed portions of photoresist layer. The method can be easily performed and the achieved the field electron emission source has a high electron emission efficiency.

Abstract: An exemplary lens barrel includes a hollow main body. The hollow main body includes a first end at an object side, and an opposite second end at an image side. The hollow main body also including a cylindrical inner surface adjacent to the first end, a partially conical inner surface adjacent to the second end, and a ring-shaped groove located between the cylindrical inner surface and the partially conical inner surface. The partially conical inner surface faces toward the first end. A cone angle of the partially conical inner surface is in a range from 8 degrees to 16 degrees.

Abstract: When a controller identifies a universal serial bus (USB) device connected to a USB interface, it outputs a control signal to close a relay and a first start test signal to an electronic device to test a USB interface of the electronic device. When the test of the USB interface is completed, to the controller adds one to an inside counter, and determines whether the count value reaches a preset count value. If the count value reaches the preset count value, the controller outputs a finish test signal to the electronic device. If the count value does not reach the preset count value, the controller controls the closed relay to open and outputs a second start test signal to close a next relay to test a next USB interface of the electronic device corresponding to the now closed relay.

Abstract: A printed circuit board includes a layer. A layer of copper is covered on a surface of the layer. A through hole passes through the printed circuit board. An approximately C-shaped thermal engraving is defined in the surface of the layers, surrounding the through hole and without being covered by the layer of copper. An opening of the thermal engraving faces an output terminal of the power supply.

Abstract: An exemplary computer case includes an external shell, a circuit board received in the external shell, and a dehumidification device. The circuit board includes a PCI socket providing an auxiliary power supply when the computer shuts down but the computer case retains electrical connection with an external AC power source. The dehumidification device includes a dehumidification card received in the PCI socket for obtaining the auxiliary power supply therefrom and a remote device. The dehumidification card includes a fan for generating airflow to remove moisture from the computer case and a sensor detecting a humidity inside the computer case. The remote device includes a display unit for displaying the result. When the humidity exceeds a predetermined value, the computer is not powered up until the fan evacuates the excess moisture from the computer case and the humidity falls below the predetermined value.

Abstract: A method for making cathode slurry is provided and includes the following steps. First, a plurality of electron emitters, an inorganic binder, and an organic carrier are provided. Second, the plurality of electron emitters, the inorganic binder, and the organic carrier are mixed to obtain a mixture. Third, the mixture is mechanically pressed and sheared.

Abstract: A gallium nitride-based semiconductor device includes a composite substrate and a gallium nitride layer. The composite substrate includes a silicon substrate and a filler. The silicon substrate includes a first surface and a second surface opposite to the first surface, and the first surface defines a number of grooves therein. The filler is filled into the number of grooves on the first surface of the silicon substrate. A thermal expansion coefficient of the filler is bigger than that of the silicon substrate. The gallium nitride layer is formed on the second surface of the silicon substrate.

Abstract: An LED illuminating device includes a boiling room, an optical module, a heat insulating member and a heat exchanging member communicating with the boiling room. The boiling room defines a horizontal room and an annular, vertical room having a bottom end surrounding the horizontal room. A wick structure is received in the boiling room. Working fluid is received in the boiling room and saturated in a bottom portion of the wick structure. The optical module includes a plurality of LEDs attached to a heat absorbing member connecting with the bottom portion of the wick structure. The heat insulating member is received in the boiling room and attached to a middle portion of the wick structure for thermally insulating the middle portion of the wick structure from vaporized working fluid in the horizontal room of the boiling room.

Abstract: An enclosure of an electronic device includes a plate. The plate defines a number of through holes. Each through hole has a pair of tabs connected to each other and with the through hole. Each pair of tabs are slantingly bent towards an inside of the enclosure. The enclosure with the shields can shield the electronic device from electro-magnetic interference.

Abstract: A testing method includes following steps. An electronic image is captured by an electronic device. A test device detect whether the image has any black bar. If the image has a black bar, pixel values in the black bar are extracted. If the pixel values in the black bar are all the same, a test result of imaging software error is presented. If the pixel values in the black bar are different from each other, a test result of mechanism error is presented. A test system associated with the testing method is also disclosed.

Abstract: A power supply circuit includes a power controller and a switch. The power controller is connected to a Southbridge chip of a motherboard. The Southbridge chip outputs status signals of the motherboard. The power controller provides a +5V_SYS voltage or a +5V_SB voltage to a universal serial bus (USB) connector according to the status signals. The switch is connected to the USB connector, a USB controller, and the Southbridge chip. The switch connects or disconnects from the USB connector and the USB controller according to the status signals.

Abstract: A method for manufacturing a light guide plate includes the follow steps. First, an injection mold including a cavity plate is provided. Then a plurality of microstructures is formed on the cavity plate by laser etching. Each microstructure includes a recess having a concave surface, and a protrusion formed around a periphery of the recess, wherein at least half of the concave surface is a mirror-like surface. Finally, a light guide plate is molded in the injection mold.

Abstract: The portable computer includes a PCIe controller, a DisplayPort connector, and a combination switch. The DisplayPort connector includes a hot plug pin. The combination switch is connected between the PCIe controller and the DisplayPort connector. The combination switch includes a selecting pin electronically connected to the hot plug pin. When the DisplayPort connector is electronically coupled to a discrete graphics card using PCIe, the hot plug pin sends a hot plug voltage signal to the selecting pin, and the combination switch electronically connects the DisplayPort connector to the PCIe controller after receiving the signal.

Abstract: A hard disk drive (HDD) bracket for fixing a HDD includes an arm, a frame pivotably connected to the arm, a handle mounted to the frame, and a fixing member slidably attached to the arm and capable of engaging with both of the handle and the arm.

Abstract: A portable sound box includes a main body and a clip. The main body includes a battery for supplying power to the portable sound box. Thus, the portable sound box can supply power on its own. The clip is fixed to the main body and configured for clipping to an external object. Thus, the portable sound box can attached to the external object instead of standing on a surface.

Abstract: A computer enclosure includes a front panel, a shielding member, and a linkage assembly. The front panel defines an opening and a pair of sliding slots beside the opening. Each of the sliding slots has a stop portion and a sliding portion. The shielding member includes a pair of sliding posts respectively received in the stop portions of the sliding slots. The linkage assembly is capable of pushing the shielding member to urge the sliding posts sliding from the stop portions to the sliding portions of the sliding slots. The shielding member is capable of covering the opening when the sliding posts are received in the stop portions of the sliding slots and capable of sliding along the sliding portions to expose the opening.

Abstract: A method for making nickel silicide nano-wire, the method includes the following steps. Firstly, providing a silicon substrate and a growing device, and the growing device including a reacting room. Secondly, forming a silicon dioxide layer on a surface of the silicon substrate. Thirdly, forming a titanium layer on the silicon dioxide layer. Fourthly, placing the silicon substrate into the reacting room, and heating the reacting room to a temperature of 500˜1000° C. Finally, forming a plurality of nickel cluster onto the surface of the silicon substrate.