Abstract: An electronic control unit is adapted to be in contact with and attached on an attachment object surface of a vehicle having thermal conductivity. The unit includes a thermally-conductive outer casing and an attachment surface. The outer casing accommodates a heat-generating electronic component. The attachment surface has a convex shape and is in contact with the attachment object surface.

Abstract: A retaining member includes at least a leg portion having a latch portion, a coupling portion and a spring portion. When the spring portion is displaced, the coupling portion is twisted. Then, the latch portion and the coupling portion are inserted into the opening so that an electric component is retained on a main face of the substrate. In this state, a part of the latch portion is disposed at the periphery of the opening on a rear face of the substrate, a part of the coupling portion is disposed in the opening, and the spring portion is disposed on the main face of the substrate. Therefore, the retaining strength of the electric component to the substrate can be improved, and damage of a side wall of the opening can be decreased.

Abstract: A retaining member includes at least a leg portion having a latch portion, a coupling portion and a spring portion. When the spring portion is displaced, the coupling portion is twisted. Then, the latch portion and the coupling portion are inserted into the opening so that an electric component is retained on a main face of the substrate. In this state, a part of the latch portion is disposed at the periphery of the opening on a rear face of the substrate, a part of the coupling portion is disposed in the opening, and the spring portion is disposed on the main face of the substrate. Therefore, the retaining strength of the electric component to the substrate can be improved, and damage of a side wall of the opening can be decreased.

Abstract: A synchronous counter comprises one D flip-flop circuit for performing divide-by-2 frequency division of a clock signal CK, JK flip-flop circuits for, when input signals have HIGH levels (logical value 1), inverting the levels of the output signals in synchronization with the clock signal CK, logic circuits for inputting control signals to the JK flip-flop circuits, lower-stage signal assembling circuits for grouping the output signals from the JK flip-flop circuits into two-signal-unit groups to produce logical product signals of the signals in these two,signal-unit groups, and upper-stage signal assembling circuits for further handling the output signals from the lower-stage signal assembling circuits, thereby firstly simultaneously satisfying an increase in speed of the counting operation as well as simplification of the wiring pattern and reduction in the circuit area and secondly realizing further increase in the counting operation.