Abstract: A package includes a package substrate, which includes a middle layer selected from the group consisting of a core and a middle metal layer, a top metal layer overlying the middle layer, and a bottom metal layer underlying the middle layer. All metal layers overlying the middle layer have a first total metal density that is equal to a sum of all densities of all metal layers over the middle layer. All metal layers underlying the middle layer have a second total metal density that is equal to a sum of all densities of all metal layers under the middle layer. An absolute value of a difference between the first total metal density and the second total metal density is lower than about 0.1.

Abstract: An embodiment bump on trace (BOT) structure includes a contact element supported by an integrated circuit, an under bump metallurgy (UBM) feature electrically coupled to the contact element, a metal bump on the under bump metallurgy feature, and a substrate trace on a substrate, the substrate trace coupled to the metal bump through a solder joint and intermetallic compounds, a ratio of a first cross sectional area of the intermetallic compounds to a second cross sectional area of the solder joint greater than forty percent.

Abstract: An antenna fixing structure includes an antenna box and a fixing frame. The antenna box includes a casing with a first circumference defined by a first center and a first radius, and the casing has equidistant first connecting portions disposed along the first circumference. The fixing frame includes a carrying board with a second circumference defined by a second center and a second radius, and the carrying board has equidistant second connecting portions disposed along the second circumference, so that the first connecting portions and the second connecting portions can be rotably installed with respect to the first and second centers and coupled to each other. Therefore, the antenna box can be rotated to a predetermined position and then fixed to the fixing frame, and the antenna fixing structure has the effect of adjusting the direction, position or angle of an antenna.

Abstract: An antenna sheath includes a tubular member and a base unit. One end of the tubular member is formed with two lateral boards corresponding to each other, an opening is formed between the two lateral boards, each of the lateral boards is formed with a shaft hole, and the inner periphery of at least one of the two shaft holes is formed with at least one first convex tooth; the base unit is installed with a connector inserted in the opening and formed with two lateral surfaces corresponding to each other, the two lateral surfaces are respectively installed with a rotation shaft correspondingly pivoted in the shaft hole, the outer periphery of at least one of the two rotation shafts is formed with plural second convex teeth annularly arranged, and the first convex teeth is engaged between any two of the adjacent second convex teeth.

Abstract: In a quick-release fixing structure for an electronic equipment, the electronic equipment includes a plurality of holes and a snap slot, and the quick-release fixing structure includes a substrate, a turning element and a plurality of fixing elements. The substrate includes a plurality of grooves and a port, and each groove includes a first groove hole and a second groove hole interconnected to the first groove hole, and the second groove hole is greater than the first groove hole. The turning element is coupled to the substrate and includes a bump exposed from the port and snapped into the snap slot. Each fixing element is passed through each first groove hole and fixed to each hole. The turning element can be turned to push the electronic equipment to move each fixing element into each second groove hole, and separate the electronic equipment from the substrate.

Abstract: A package includes a package substrate, which includes a middle layer selected from the group consisting of a core and a middle metal layer, a top metal layer overlying the middle layer, and a bottom metal layer underlying the middle layer. All metal layers overlying the middle layer have a first total metal density that is equal to a sum of all densities of all metal layers over the middle layer. All metal layers underlying the middle layer have a second total metal density that is equal to a sum of all densities of all metal layers under the middle layer. An absolute value of a difference between the first total metal density and the second total metal density is lower than about 0.1.

Abstract: An antenna fixing structure includes an antenna box and a fixing frame. The antenna box includes a casing with a first circumference defined by a first center and a first radius, and the casing has equidistant first connecting portions disposed along the first circumference. The fixing frame includes a carrying board with a second circumference defined by a second center and a second radius, and the carrying board has equidistant second connecting portions disposed along the second circumference, so that the first connecting portions and the second connecting portions can be rotably installed with respect to the first and second centers and coupled to each other. Therefore, the antenna box can be rotated to a predetermined position and then fixed to the fixing frame, and the antenna fixing structure has the effect of adjusting the direction, position or angle of an antenna.

Abstract: An embodiment bump on trace (BOT) structure includes a contact element supported by an integrated circuit, an under bump metallurgy (UBM) feature electrically coupled to the contact element, a metal bump on the under bump metallurgy feature, and a substrate trace on a substrate, the substrate trace coupled to the metal bump through a solder joint and intermetallic compounds, a ratio of a first cross sectional area of the intermetallic compounds to a second cross sectional area of the solder joint greater than forty percent.

Abstract: A key mechanism includes a tray, at least one keycap, at least one supporting structure and an engaging component. The at least one keycap is disposed on a side of the tray. The at least one supporting structure is connected to the tray and the at least one keycap for supporting the at least one keycap on the tray. The engaging component is installed on the tray. The engaging component includes a pivoting portion and an engaging portion. The pivoting portion is pivoted to the at least one supporting structure, and the engaging portion engages into an opening on a casing as the tray is assembled on the casing, so as to fix the tray on the casing.

Abstract: An embodiment apparatus includes a dielectric layer in a die, a conductive trace in the dielectric layer, and a protrusion bump pad on the conductive trace. The protrusion bump pad at least partially extends over the dielectric layer, and the protrusion bump pad includes a lengthwise axis and a widthwise axis. A ratio of a first dimension of the lengthwise axis to a second dimension of the widthwise axis is about 0.8 to about 1.

Abstract: A power storage device includes a positive electrode and a negative electrode disposed opposite to the positive electrode. The positive electrode and the negative electrode are respectively disposed on at least one surface of a current collector foil. The positive electrode and the negative electrode respectively include an active material, a conductive auxiliary and an adhesive, wherein the active material includes a porous material, an oxidation-reduction electrode material, or combination thereof. At least one of the positive electrode and the negative electrode has a multilayer structure containing three or more layers. The concentration of the oxidation-reduction electrode material in the outmost layer of the multilayer structure is the lowest.

Abstract: A package includes a package substrate, which includes a middle layer selected from the group consisting of a core and a middle metal layer, a top metal layer overlying the middle layer, and a bottom metal layer underlying the middle layer. All metal layers overlying the middle layer have a first total metal density that is equal to a sum of all densities of all metal layers over the middle layer. All metal layers underlying the middle layer have a second total metal density that is equal to a sum of all densities of all metal layers under the middle layer. An absolute value of a difference between the first total metal density and the second total metal density is lower than about 0.1.

Abstract: A calibration circuit and a calibration method are provided. The calibration circuit has a delay circuit, a phase detector, and a controller. The delay circuit delays an input signal to output an output signal, wherein a delay time between the input signal and the output signal is related to an equivalent capacitance and an equivalent resistance of the delay circuit. The phase detector coupled to the delay circuit compares the phases of the input signal and the output signal. The controller coupled to the delay circuit and the phase detector generates a control signal according to the comparison result of the phase detector to adjust the equivalent resistance of the delay circuit.

Abstract: A micro-electro-mechanical system (MEMS) includes a micro-mechanical structure that generates a first electrical signal. An analog-to-digital converter (ADC) is coupled with the micro-mechanical structure. The first electrical signal is converted to a second electrical signal using a converter coupled between the micro-mechanical structure and the ADC. The first electrical signal is free from being amplified.

Abstract: An antenna sheath includes a tubular member and a base unit. One end of the tubular member is formed with two lateral boards corresponding to each other, an opening is formed between the two lateral boards, each of the lateral boards is formed with a shaft hole, and the inner periphery of at least one of the two shaft holes is formed with at least one first convex tooth; the base unit is installed with a connector inserted in the opening and formed with two lateral surfaces corresponding to each other, the two lateral surfaces are respectively installed with a rotation shaft correspondingly pivoted in the shaft hole, the outer periphery of at least one of the two rotation shafts is formed with plural second convex teeth annularly arranged, and the first convex teeth is engaged between any two of the adjacent second convex teeth.

Abstract: Disclosed is a fullerene derivative having a formula of F-Cy, wherein F is an open-cage fullerene, and Cy is a chalcogenyl group. The fullerene derivative can be applied to hydrogen storage material and an optoelectronic device such as an organic light emitting diode (OLED), a solar cell, or an organic thin film transistor (TFT).

Abstract: A key mechanism includes a tray, at least one keycap, at least one supporting structure and an engaging component. The at least one keycap is disposed on a side of the tray. The at least one supporting structure is connected to the tray and the at least one keycap for supporting the at least one keycap on the tray. The engaging component is installed on the tray. The engaging component includes a pivoting portion and an engaging portion. The pivoting portion is pivoted to the at least one supporting structure, and the engaging portion engages into an opening on a casing as the tray is assembled on the casing, so as to fix the tray on the casing.

Abstract: A micro-electro-mechanical system (MEMS) includes a micro-mechanical structure that is capable of generating a first electrical signal. An analog-to-digital converter (ADC) is coupled with the micro-mechanical structure. The MEMS is free from including any amplifier between the micro-mechanical structure and the ADC.

Abstract: A signal transmission system includes a first clock signal generator and a second clock signal generator. The first clock signal generator is configured for generating a first clock signal according to clock information derived from a transmitted signal, wherein the transmitted signal is changed in response to a frequency change of a second clock signal, and the first clock signal generator enters a frequency-unlocked state if the second clock signal has a frequency transition from a first frequency to a second frequency during a first time period. The second clock signal generator is configured for generating the second clock signal having the frequency transition from the first frequency to the second frequency during a second time period longer than the first time period such that the first clock signal generator stays in a frequency-locked state during the second time period.

Abstract: In an interface card and antenna fixture structure of a communication module, an interface card includes a printed circuit board, a circuit module, a plurality of pins, and an antenna connector, and the antenna is conductively coupled to the antenna connector, and the pressing component is disposed on the printed circuit board and installed at a corresponding connecting position of the antenna and the antenna connector, and the locking component is passed through the pressing component and the printed circuit board and coupled to the motherboard, such that the pressing component presses the antenna and the antenna connector.