Patent ID: 8077464

Claim:
Electronic circuitry comprising a circuit board and at least one component mounted on the circuit board, the at least one component generating heat in use, the circuit board including at least one aperture aligned with the component or a respective one of the components, and the electronic circuitry being configured to provide, in use, a path for coolant fluid to flow through the or each aperture and past the at least one component, the electronic circuitry being characterized in that it further comprises at least one further aperture, wherein the at least one aperture and the at least one further aperture are arranged so that coolant fluid can flow in through the at least one aperture and out through the at least one further aperture and such that there is a closed path between the at least one aperture and the at least one further aperture, and wherein the position of the or each at least one aperture is such that in use coolant fluid passing through the aperture approaches the surface of the component with which the aperture is aligned from a perpendicular direction and aligned at or near a central region of the component, and, wherein said circuit board further comprises at least one further portion of solder, that provides a barrier to coolant flow thereby to produce a closed path between at least one of the apertures and at least one of the further apertures.