Yamaha Hatsudoki Kabushiki Kaisha

Koji Morita

Takayuki Murai

Takao Yoshikawa

An electronic substrate is used to mount a plurality of semiconductor chips thereon. The substrate includes a first conductive member, a second conductive member, and an insulating layer. The first conductive member is electrically connected to one of the semiconductor chips. The second conductive member is electrically connected to another one of the semiconductor chips. The insulating layer is arranged to electrically isolate the second conductive member from the first conductive member. The first conductive member is a conductive base that supports the insulating layer, the semiconductor chips and the second conductive member thereon.

Electronic substrate, power module and motor driver

A semiconductor device for power control includes a substrate made of aluminum. Lands of copper are formed on the substrate. Semiconductor chips, such as FETs, are mounted on the lands. The semiconductor chips are joined with the lands only through solder layers. A synthetic resin, which includes epoxide, covers the lands, the solder layers and the semiconductor chips on the substrate. Preferably, a coefficient of expansion of the synthetic resin is generally less than a coefficient of expansion of the substrate or a coefficient of expansion of the lands. Each semiconductor chip defines at least two corners positioned generally opposite to each other. Each land defines at least two corners disposed in proximity to the corners of the semiconductor chip. The corners of the land generally confine the corners of the semiconductor chip therein.

Power control device with semiconductor chips mounted on a substrate

An improved trigger circuit for a magneto-type ignition system is described. The trigger circuit includes a first generating coil for supplying current flow to a primary winding of the ignition coil, a transistor for controlling the current flow through the primary winding, a capacitor, a thyristor for cooperating with the capacitor to render the transistor non-conductive, and a second generating coil for supplying the power required to charge the capacitor and to control the conduction of both the transistor and thyristor, such that the capacitor is charged and the transistor is rendered conductive by one half wave output from the second generating coil and the thyristor is rendered conductive by the other half wave output from the second generating coil. The conduction of the thyristor is operative to discharge the capacitor and render the transistor non-conductive, whereby the current flow from the first generating coil is directed through the primary winding of the ignition coil to induce a sparking potential in the secondary winding of the ignition coil.

Growing community of inventors

Iwata, Japan

Koji Morita