Abstract: The present invention relates to a protection structure for use with an electronic device having an interchangeable housing. The protection structure includes a first protection element and a second protection element. The first protection element is disposed between an upper cover and an electronic module of the electronic device. The second device is disposed between a lower cover and the electronic module of the electronic device and coupled to the first protection element. When a user disassembles the upper and lower covers, the first and second protection elements protect the electronic module.

Abstract: A mobile phone with a dual PCB structure. The mobile phone includes a first PCB with electronic elements disposed thereon. A conductive enclosure is disposed on the first printed circuit board. A second printed circuit board has a plurality of layers and contacts the conductive enclosure. The first printed circuit board, the conductive enclosure and the second printed circuit board form a closed space within which the electronic elements are disposed. The first layer next to the conductive enclosure is an exposed copper layer grounded to protect the electronic elements from EMI.

Abstract: A mobile phone with a changeable keypad. The mobile phone has a connecter disposed on a main board mounted on a frame assembly and a keypad having a second PCB with a plurality of keys. The keypad is movably disposed on the frame assembly through a groove. The second PCB of the keypad is detachably connected to the main board through the connecter, such as a spring-type connecter or an FPC.

Abstract: A hinge mechanism for pivotally connecting a flip onto a housing includes a bush, a spring, and a camshaft. The bush is connected to the flip and has a sidewall, a receiving space defined by the sidewall, and a protrusion. The protrusion is protruded from the sidewall. The camshaft has a first end, a second end, and a shaped notch. The shaped notch includes a first concave portion and a second concave portion, and the protrusion is slidably received within the shaped notch. The first end of the camshaft is slidably coupled to the bush, and the second end of the camshaft is restrictedly coupled to the housing. When the flip is pivoted on the housing, the bush simultaneously rotates around the pivoting axis of the hinge mechanism so that the protrusion slides within the shaped notch from the first concave portion to the second concave portion.

Abstract: A hinge mechanism for pivotally connecting a flip onto a housing includes a bush, a compression spring, and a release button. The bush has a sidewall, a receiving space defined by the sidewall, and a protrusion. The protrusion is protruded from the sidewall. The release button has a shaped notch, which includes a concave portion, a stop portion, and a convex portion formed between the concave portion and the stop portion. The stop portion extends substantially parallel to the pivoting axis. The protrusion is slidably received within the shaped notch. The compression spring is disposed within the receiving space and pressed by the release button and the bush. When closing the flip, the bush rotates synchronously with the flip and the protrusion moves in the shaped notch. When pushing the release button, the flip opens automatically.

Abstract: One embodiment of the present invention provides a system for detecting a valid clock signal at a clock receiver. The system operates by receiving a clock signal at the clock receiver, and directing the clock signal into a control input of a voltage-controlled variable resistor. Next, the system uses the voltage-controlled variable resistor to control a first current. A current mirror is then employed to create a second current from the first current. This second current passes through a resistor to produce a control voltage, which is amplified to produce a validity signal indicating whether or not the clock signal is valid. In one embodiment of the present invention, the system additionally uses at least one capacitor to filter out periodic fluctuations in the validity signal.

Abstract: This invention provides a simply constructed sealed button (1) having an elastic spring (2) defining a pair of end portions (4) with respective hook members (6, 7) formed on the opposing end portions (4). A main body housing (5) defining an internal chamber includes a T-shaped conduit mounted within the housing chamber for insert of the hook members (6, 7). The hook members (6, 7) are hooked to each other at an intersecting portion of intersecting through passages of the T-shaped closed conduit. A transparent cover (8) is mounted to the sidewall of the main body housing (5) to provide a sealed button.

Abstract: A method for continuously relieving residual stresses in hot extruded then cold drawn brass sections, particularly leaded yellow brass. In the disclosed method, the residual stress is localized near the surface of the brass section during cold draw by limiting the percentage reduction in cross-sectional area for the section as it passes through a smaller angle cold draw die. This is accomplished by using a cold draw die having a relatively small attack angle which minimizes the stress at the center of the brass section and localizes the residual stress to an area near the surface of the section. The configured extruded, cold drawn rod is mechanically worked by passing it through mechanical benders which are set to alternatively bend the rod out of alignment first relative to a horizontal longitudinal axis and then relative to a vertical longitudinal axis.