Patent ID: 11956908
Assignee: HITACHI ASTEMO, LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC H  B | IPC B  H

Claim 6:
7. A method for manufacturing an electronic control unit, the method comprising:
arranging a control board in a mold; and
sealing the control board in an enclosure by injecting resin into the mold,
wherein the enclosure has a shape in which a volume on a first surface side is larger than a volume on a second surface side, and includes a resin flow path in which resin injected toward the control board branches off toward the first surface side and the second surface side of the control board,
a cross-sectional area of the branched resin flow path is formed to be larger on the first surface side of the control board than on the second surface side, and
an area ratio between an area of the gate mark on the first surface side with respect to the control board and an area of the gate mark on the second surface side with respect to the control board and a volume ratio between a volume of the enclosure on the first surface side with respect to the control board and a volume of the enclosure on the second surface side with respect to the control board are formed to be substantially equal to each other.