In a ventilation mechanism of an electronic control device, a ventilation path is formed by a through hole and a window formed in a side surface of a projection projecting outward of a case, and entry of water into the ventilation path is prevented by a wall. A water-repellent filter is attached to an inner wall of the case, with a gap between the water-repellent filter and a bottom surface of the projection. The projection and the wall are integrated with the case. This achieves reduction in the number of components of the ventilation mechanism and improvement in machinability while ensuring a waterproof function.

An electronic control device (10) includes a housing having a plurality of housing members (1) joined together, a housing vent hole (2) formed through the housing member (1) so as to extend in a thickness direction of the housing member, a protection wall (3) covering an outer opening (2b) of the housing vent hole (2), with a gap (3b) left between the protection wall (3) and the outer opening (2b), a protection-wall vent hole (3a) formed in the protection wall (3) at a position apart from the housing vent hole (2) so as to extend from the gap (3b) in a radial direction of the housing vent hole (2), and an air-permeable waterproof membrane (5) fixed to an inner opening (2a) of the housing vent hole (2). A vent passage (6) with a bent part (6a) is formed between the air-permeable waterproof membrane (5) and the protection-wall vent hole (3a).

Disclosed is a base plate (1) and the protective case of a printed circuit. The plate includes a ventilation filter (4) and at least one rivet blank (5) projecting from the plate and intended to penetrate the printed circuit and to be deformed for rigidly connecting the printed circuit to the base plate by projecting from a face (1a) of the plate, the filter including at least one ventilation opening (6). The rivet blank is borne by the filter and includes an internal tube (7) passing right through the rivet blank in the projecting direction thereof, the internal tube opening, on one side, onto an end of the rivet blank that projects furthest from the plate while forming the ventilation opening and, on the other side, into the ventilation filter.

The present invention proposes a protective case for a motor vehicle computer, the case including a ventilation filter (50) and at least one wall (41) including a mounting portion (410) for mounting the ventilation filter, in which portion an opening (42) and at least one air flow channel (43) extending from the opening are formed, the ventilation filter including a membrane (51) covering the opening and a protective member (52) for protecting the membrane, mounted on the mounting portion and defining at least one aperture opening onto the flow channel (43), the flow channel being configured so as to prevent the membrane from being reached by a flow of water traveling along a straight path from the aperture, in order to prevent damage to the membrane by the flow of water.

Provided herein is an apparatus including circuitry as well as membrane that is configured to pass air, to remove heat from the circuitry, and to prevent the circuitry from being exposed to moisture. The membrane is additionally includes pores.

Disclosed herein is a pressure compensation device for securing the air permeability of the electronic control unit (ECU) of a vehicle. A pressure compensation device according to an aspect of the present invention includes a vent unit integrated with a connector on a part of an ECU on which an electronic control element is mounted, wherein a vent hole penetrating the inside and outside of the case of the ECU in which the electronic control element is received is formed in the vent unit and a cover unit integrated with a vehicle-side connector in such a way as to form electrical connection with the ECU and configured to form a protection wall by covering part of the upper side of the vent unit when the ECU-side connector and the vehicle-side connector are coupled.

A dehumidifying device for a housing, in particular an electronics housing of an electromotor with a dehumidifying chamber includes a wall inside of which a hygroscopic material is received which is designed to bind air moisture from the dehumidifying chamber. The wall of the dehumidifying chamber includes at least one inner membrane permeable to vapor which can be brought into an active connection with an inner receiving space of the housing and an outer membrane which can be brought into an active connection with the outside environment of the housing. The at least one inner membrane and the outer membrane are permeable to vapor at least in a direction in which a transport of air moisture out of the inner receiving space of the housing through the dehumidifying chamber into an outside environment can be ensured.

A circuit board is sealed and housed in a casing including a base and a cover, a connector housing including a partition wall is mounted on the circuit board, and an electrical connection between the interior and the exterior of the casing is established. A water-repellent filter is fixed to an inner surface of the partition wall, an outer surface portion of the water-repellent filter is opened to atmosphere via the breath ventilation hole, and an atmospheric opening surface thereof is formed such that the atmospheric opening surface being wetted directly with water is avoided by a poured water blocking wall and water barrier walls. A position where the poured water blocking wall is provided is changed by an insert mold in response to the direction of the mounting surface of the base.

A case configured with a base and a cover watertightly contains a circuit board, and a connector housing having a diaphragm is mounted in the circuit board so that the inside and the outside of the case are electrically connected with each other; an outer ring-shaped circumferential wall is provided on the outer surface of the diaphragm, and a protrusion portion having first and second ventilation holes is provided at the side surface of the outer ring-shaped circumferential wall; one end of each of the first and second ventilation holes communicates with the outer surface portion of a water-repellent filter provided on the inner wall surface of the diaphragm, and the other end thereof communicates with the inside of a recess portion that is situated at a side of the mating connector and fits with the protrusion portion.

An electronic device includes a housing including a through hole, a sheet which is impermeable to water, permeable to air, and located to cover the through hole, and a cover which is attached to the housing and partially covers an outer surface of the housing while the cover covers the through hole. The housing includes a first portion not covered with the cover even while the cover is attached to the housing. The cover and the housing include at least one recess and at least one projection which can be fitted to the recess, in any of them respectively, so as to function as a shield in at least a part between the first portion and the through hole.