Abstract: An edge connector includes, a multilayer printed board having an inner layer and a connector edge, an electronic circuit disposed on the multilayer printed board, an electrical terminal on the multilayer printed board and spaced by a predetermined clearance from the connector edge, an electrical conductor on the multilayer printed board and connected between the electronic circuit and the electrical terminal, a via connected to the electrical terminal and extending to the inner layer of the multilayer printed board, and a lead conductor on the inner layer of the multilayer printed board and connected at one end to the via, another end of the lead conductor being exposed at the connector edge. The electrical terminal is plated. The sum of the length of the via and the length of the lead conductor is less than one-sixth of the wavelength of an electrical signal transmitted.

Abstract: An edge connector includes, a multilayer printed board having an inner layer and a connector edge, an electronic circuit disposed on the multilayer printed board, an electrical terminal on the multilayer printed board and spaced by a predetermined clearance from the connector edge, an electrical conductor on the multilayer printed board and connected between the electronic circuit and the electrical terminal, a via connected to the electrical terminal and extending to the inner layer of the multilayer printed board, and a lead conductor on the inner layer of the multilayer printed board and connected at one end to the via, another end of the lead conductor being exposed at the connector edge. The electrical terminal is plated. The sum of the length of the via and the length of the lead conductor is less than one-sixth of the wavelength of an electrical signal transmitted.

Abstract: A light transmitter for preventing the degradation of the extinction ratio and the occurrence of pulse width distortion in the light output in spite of the variation of current to light conversion efficiency A of the laser diode. The transmitter uses the characteristics such that the light pulse width becomes narrower than the modulation current pulse width if the laser diode is modulated by a bias current smaller than the threshold level. The light transmitter includes mismatch detection circuit (14) which detects the decrease of the light pulse width. By the detected mismatch signal, the modulation current control circuit (15) limits to increase the modulation current. The modulation current control circuit (15) operates together with the control circuit which controls automatically the light output peak value to be constant.

Abstract: A continuously cast slab of grain-oriented electrical steel is heated, subjected to heavy-reduction edge rolling at such amount not less than 60 mm as is required for matching with the width of a hot-rolled coil to be produced therefrom, whereafter the dogbones formed in the slab by the heavy-reduction edge rolling are eliminated by horizontal rolling to obtain a flat slab. The flat slab is then heated to a high temperature and hot rolled. Optionally, the edges of the slab can be heated prior to the finish rolling step of the hot rolling process. The method enables production of grain-oriented electrical sheet with high productivity.