The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 2009
Filed:
Jun. 23, 2006
Hiroshi Inoguchi, Gunma, JP;
Hiroshi Inoguchi, Gunma, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Kanto Sanyo Semiconductors Co., Ltd., Gunma, JP;
Abstract
In a circuit device having a circuit element housed in a case, a rise of air pressure and occurrence of condensation in the case are prevented. A circuit device of the present invention includes a case formed of a bottom part and a side part, and a cover part covering an upper surface of the side part. In an internal space of the case, a circuit element such as a semiconductor element is housed. In a bottom part of the case, a land and leads are buried. A communicating part which causes the internal space of the case to communicate with an outside of the case is provided in the land. By providing the communicating part, the rise of air pressure and occurrence of condensation in the internal space due to change in temperature are suppressed. Furthermore, in the land made of metal, the communicating part can be easily formed by etching or the like.