Hermetic electronic equipment with flexible diaphragm, fastened to case by elastic U-shaped ring, for absorbing pressure fluctuations
US5434748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Jul 22, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/926
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electronic circuit equipment including a substantially box-shaped case main body (10) for defining a sealed interior space therein and an electronic circuit board (11) having a plurality of electronic components (12) thereon. The case main body (10) comprises a case body (13) and a flat plate-shaped lid (17) positioned properly with respect to the case body (13) to seal the interior space. A vent hole (20) is formed in the bottom wall of the case body (13) for communicating the interior of the case body (13) with ambient atmosphere. A cover member is attached to the case body (13) to cover the vent hole hermetically. By using a cover member, the interior space of the case body (13) is sealed for protecting electronic components (12) on the electronic circuit board (11) from moisture and rainwater and, for absorbing a pressure fluctuation therein. A mounting flange extends from the case body and surrounds the vent hole. The cover member is a flexible diaphragm with a circumferential bulge. The flexible diaphragm is fastened to the mounting flange by a press-fit elastic U-shaped ring which presses the circumferential bulge against the mounting flange so as to form a hermetic seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.