Abstract: An overvoltage protection circuit and a portable electronic device having the same are introduced. The overvoltage protection circuit provides overvoltage protection when an input voltage exceeds a rated voltage tolerable by an internal circuit unit in the portable electronic device. A reference voltage and a partial voltage are generated from the input voltage through a voltage limiting unit and voltage dividing module, respectively, and conveyed to a comparing module for comparison. Comparison of the reference voltage and the partial voltage is followed by generation of a switch signal whereby a switch unit determines whether to apply the input voltage to the internal circuit unit. The voltage dividing module sets the maximum rated voltage tolerable by the internal circuit unit and enables the overvoltage protection circuit to give overvoltage protection to the portable electronic device regardless of temperature.

Abstract: An electromagnetic shielding cover and a device having the same are introduced. The device comprises a casing and is coupled to a base having a printed circuit board on which an electronic component is mounted. The casing is defined with a receiving region. The electromagnetic shielding cover is disposed within the receiving region and coupled thereto. The electromagnetic shielding cover is marked with a plurality of peripheral folding lines. The electromagnetic shielding cover is folded along the peripheral folding lines by an angle to form a plurality of walls and a shielding space. Coupling the casing and the base together allows the electromagnetic shielding cover to shield an electronic component mounted on the circuit board and received in the shielding space, thereby shielding the electronic component from electromagnetic interference. The electronic component can be easily changed and tested during a rework process.

Abstract: A sliding door is coupled to a casing having therein a receiving space, a port received in the receiving space, a first opening formed at the casing, and a first guide rail fixed to the casing to face the receiving space and positioned proximate to the first opening. The sliding door includes a frame body and a door body. The frame body is received in the receiving space and has a second guide rail, a resilient arm, and a second opening corresponding in position to the first opening. The door body is disposed between the casing and the frame body and slides along the first guide rail and the second guide rail to selectively block or unblock the first opening and the second opening. Accordingly, the sliding door structure is selectively opened or shut as needed, so as to protect the port.

Abstract: An electromagnetic shielding cover disposed on a printed circuit board having thereon an electronic component includes a lid and a frame which are coupled together to shield the electronic component from electromagnetic interference and allow the electronic component to be changed and tested easily during a rework process.

Abstract: An ultrasonic welding structure includes a welding plane and an energy-directing edge. The welding plane is formed on a first object or a second object. The energy-directing edge is formed on the first object or the second object and corresponds in position to the welding plane. The welding plane is oblique to a lamination direction of an ultrasonic device. The first object and the second object are welded together by ultrasonic welding which requires laminating the first object to the second object in the lamination direction so as for the energy-directing edge to exert a contact pressure upon the welding plane. Due to the welding plane and the energy-directing edge, ultrasonic welding thus performed requires less welding area and alignment structure than are taught by the prior art and is conducive to miniaturization of mobile electronic products.

Abstract: A smallcell base station and a channel assignment method for the same are introduced. In response to a connection mode-related service request make by a user equipment (UE) for performing a communication service, a channel assignment processor of the smallcell base provides a forward access channel (FACH) for functioning as a communication route of the UE, assigns to the UE the FACH for functioning as a wireless transmission channel between the smallcell base and the UE in the connection mode when no dedicated channel (DCH) is available, and discontinues other communication services so as to release a DCH to the UE when the communication service has higher priority. Accordingly, the smallcell base need not keep a DCH for use in accessing during the connection mode, thereby making good use of channel resources.

Abstract: It is a snap-engagement structure whereby a mother body and a daughter body of a portable electronic device are snap-engaged with each other and thereby fixed to each other. The mother body includes two installation units. The snap-engagement structure includes a key unit, fastening units, and a first restoring unit. The key unit and the fastening units move relative to each other in different directions to effectuate enhanced snap-engagement, watertightness, and miniaturization.

Abstract: An electronic device supporter fixes the electronic device to a rear-view mirror base inside a vehicle and includes an adjustive support portion, a coupling portion, and an engaging portion. The adjustive support portion adjusts the position of the electronic device relative to the rear-view mirror base. The coupling portion is disposed beside the adjustive support portion and coupled to the electronic device. The engaging portion is disposed beside the adjustive support portion and engaged with the rear-view mirror base. With the electronic device supporter, not only can the electronic device be firmly installed on a rear-view mirror base inside a vehicle, but the angle of elevation, angle of depression, and position of the electronic device can be adjusted.

Abstract: An input/output module comprises a module body, a circuit board, and an input/output port. The circuit board is coupled to the module body and has a first surface and a second surface. A second connection portion is disposed on the second surface and electrically connected to a mobile electronic device body. The input/output port is disposed on the first surface and electrically connected to the second connection portion. The input/output port has an insertion end corresponding in position to an opening of the module body and connected to an external transmission connector. Further provided is a mobile electronic device having an input/output module, wherein the input/output module is replaceable such that the mobile electronic device has a transmission interface function and is expandable in applicability.

Abstract: A sound quality testing method and system test sound quality of a network-based communication device. The method includes connecting the network-based communication device to a test host through the Internet; sending a testing signal from the test host to the sound receiving unit for generating an audio packet signal; sending the audio packet signal from the sound receiving unit to the test host through the Internet to produce a first test result; sending a test packet signal from the test host to the network-based communication device through the Internet to enable the network-based communication device to generate a speaker signal; receiving and analyzing the speaker signal by the test host to produce a second test result; and evaluating sound quality of the network-based communication device by the test host based on the first test result and the second test result.

Abstract: A heat-dissipating casing for a communication apparatus accommodates a circuit board having a power element and includes an insulating case, a lid coupled to the insulating case, and a thermally conductive metal member. The insulating case has a receiving space, a first opening, and a second opening. The first and second openings communicate with the receiving space. The thermally conductive metal member is fixed to the inside of the insulating case, seals the second opening, and dissipates heat generated by the power element. The heat-dissipating casing is effective in dissipating heat, characterized by its low weight and low production costs, and conducive to protection and dust prevention.

Abstract: An assembled electromagnetic shielding case conducive to electromagnetic interference shielding and heat dissipation of an electronic component on a printed circuit board includes a body, a shielding element, and a fixing element. The body has an opening and an engagement portion. The engagement portion connects the body and the printed circuit board. The shielding element has a bottom side and a heat-dissipating side opposing thereto. The shielding element closes the opening for effectuating electromagnetic interference shielding. The shielding element dissipates heat generated from the electronic component by transferring the heat from the bottom side to the heat-dissipating side for dissipating the heat. The fixing element couples the body and the shielding element.

Abstract: A sound quality testing device for testing a communication apparatus has a sound generating unit and a sound receiving unit. The sound quality testing device includes a carrying unit, a first testing module, and a second testing module. The carrying unit carries the communication apparatus. The first testing module generates and sends a sound signal to the sound receiving unit. The second testing module receives a sound-generating signal generated by the sound generating unit. The sound quality testing device provides a standardized simulation testing environment having low or no noise signals, such that the communication apparatus can be tested precisely and steadily in terms of sound quality, such as volume, frequency responses, and harmonic wave distortion.

Abstract: An adhesive tape is disclosed. The adhesive tape includes a first release layer, an adhesive layer, and a second release layer, wherein the second release layer has a positioning portion, and a total area of the second release layer is greater than a total area of the first release layer. Further, an adhesion device and an adhesion method are disclosed. The adhesion device includes a base having a receiving slot and a positioning unit. The adhesive tape is received in the receiving slot of the base, such that the positioning portion of the adhesive tape and the positioning unit of the base are used for positioning each other. After the first release layer is removed to expose the adhesive layer, a supporting component is adhered to the adhesive layer.

Abstract: A method for laying out a printed circuit board for use in a gigabit-capable passive optical network includes the steps of providing a printed circuit board and laying out an analog circuit module, an analog-to-digital conversion module, a signal processing module, an optoelectronic transmitting and receiving module, and a power module on the printed circuit board. The printed circuit board has a first periphery and an opposing second periphery. The analog circuit module and the optoelectronic transmitting and receiving module are laid out at the first periphery of the printed circuit board. The power module is laid out at the second periphery of the printed circuit board. Electromagnectic wave generated by a power IC inserted in the power module does not interfere with data transmission taking place at the optoelectronic transmitting and receiving module. Furthermore, a printed circuit board for use with the method is proposed.

Abstract: An assembly device for assembling a main body and an external chamber of a product includes: a base, laterally pressing units disposed on left and right sides of the base, and an actuator disposed on a rear side of the base. The external chamber of the product is positioned on the base. The laterally pressing units press an opening of the external chamber from left and right sides thereof so as to generate convex deformations on upper and lower sides of the opening. The actuator moves the main body towards the opening of the external chamber so as to dispose the main body in the external chamber. The invention avoids product damages, saves time and labor consumption, and improves the product yield.

Abstract: A voltage and current measuring device includes a plurality of voltage measuring modules, a plurality of one-way current measuring modules, a plurality of two-way current measuring modules, a voltage transformation module, a communication interface module, and a processor. The modules are integrated to provide different ways of measuring voltage and current concurrently, enable peripheral expansion, and facilitate power supply. Hence, the device features integration and versatility, speeds up a measurement process, and cuts production costs.

Abstract: An integrated temperature and humidity control device includes a temperature and humidity sensing element, a temperature and humidity sensing transmission interface, a computation processing module, a communication interface, and a display interface which are integrated with each other. The device performs local and remote fab temperature and humidity control simultaneously and allows on-site display of temperature and humidity levels at the fab. Accordingly, the device enables convenient simultaneous control and display of temperature and humidity levels and simplifies the layout thereof.

Abstract: An electric lock control circuit and method allow users to control an electric lock with a reference password pertaining to a parameter related to at least two dimensions. The circuit includes a substrate, a memory unit, an input unit, and a processing unit. The memory unit stores the reference password. The input unit rotates in a space of at least two dimensions to generate a parameter signal related to at least two dimensions. The processing unit encodes the parameter signal to turn the parameter signal into an input code and outputs an unlocking signal or a locking signal based on a result of comparison of the input code and the reference password to control the electric lock. Controlling the electric lock with a reference password pertaining to a parameter related to at least two dimensions enhances confidentiality and complexity of the electric lock.

Abstract: An indicator testing system for testing a plurality of indicators disposed on an electronic product and adapted to display a status includes a plurality of light sensors, a holder for holding the light sensors, and a signal processing module. The light sensors correspond in position to the indicators on the electronic product, respectively, and each generate a corresponding light testing signal whereby the signal processing module generates a brightness testing signal related to each indicator. The indicator testing system speeds up an indicator test, enhances the precision of the indicator test, and ensures the quality of the electronic product.