Abstract: A method of establishing a coupon bar is applied to circuit layout of a multi-layer printed circuit board (PCB). A coupon bar library storing a great number of coupon bars and sets of setting parameters each corresponding to a coupon bar is connected. A set of parameters including a layer number value, a board thickness value, a line width value, and a distance value is input. The set of inputted layout parameters is compared with the setting parameters stored in the coupon bar library, so as to obtain a set of setting parameters and the corresponding coupon bar matching with each other. The obtained coupon bar is laid on one layer of the multi-layer PCB.

Abstract: A mobile communication device using roller input comprising a plurality of roller input units, a plurality of press units, an image extraction unit and a calculation processing unit is provided. Each of the roller input units comprises a plurality of faces, and each face at least has an instruction, and each instruction has a corresponding pit at a predetermined distance. The press unit is electrically connected to the roller input unit to provide a press and generate a press-triggered signal to the image extraction unit, so that a pattern containing the instruction and the pit can be extracted and sent to the calculation processing unit. Thus the predetermined distance between the instruction and the pit is calculated, and the pattern can be converted into an electronic digital signal according to the predetermined distance. Finally, the electronic digital signal, i.e. the user input result, is displayed through the display unit.

Abstract: A communication device outside-connected incoming call indicator and an earphone device having such an incoming call indicator are provided. The incoming call indicator has a first communication port connected to a communication device, which is used to receive the incoming call; and an incoming call indication module used to detect the incoming signal and send out an incoming call indication. The earphone device with the incoming call indicator has a connector, which is used to connect to a communication device provided with an insertion hole, and receive the incoming call signal transmitted from the communication device; an incoming call indicator, which is used to receive the incoming call signal and send out an incoming call indication; and an earphone, which is used to receive and broadcast the voice signals transmitted from the communication device. A signal wire is used to connect the connector, the incoming call indicator, and the earphone.