Patent ID: 9301385
Filing Date: 2016-03-29
CPC Classification: B60Q,F21V,H05K

Claim Text:
1. An electronic unit comprising: an electronic body on which a heat generating component is mounted; a resin casing in which the electronic body is housed; and a heat diffusion sheet interposed between the casing and a region of the electronic body where the heat generating component is mounted; wherein: the electronic body includes a circuit board in which the heat generating component is mounted on a first surface; the circuit board includes a heat transfer structure for transferring heat generated by the heat generating component toward a second surface that is on an opposite side of the circuit board from the first surface; the heat diffusion sheet is arranged between the second surface of the circuit board and an inside surface of the casing, in a state closely contacting the second surface of the circuit board and the inside surface of the casing; and the heat transfer structure is formed by a heat transfer pad that is formed by a portion of a conductive film on the first surface of the circuit board, and on which the heat generating component is mounted; a heat dissipating pad that is formed by a portion of a conductive film on the second surface of the circuit board; and a through-hole that passes through the circuit board in a thickness direction of the circuit board, for electrically connecting the heat transfer pad and the heat dissipating pad together.