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:
Jul. 22, 2003
Filed:
May. 21, 2002
Hironao Yamaguchi, Gamagori, JP;
Denso Corporation, Kariya, JP;
Abstract
A vehicle headlamp housing is naturally ventilated by a temperature difference between air inside and air outside the lamp housing, to prevent the temperature of a lighting control circuit from increasing and to reduce thermal loads applied to circuit elements. The lamp housing includes a first opening lower than, and a second opening higher than the lighting control circuit. The first opening permits air access to a space, where the lighting control circuit is contained. The second opening also permits air access to the space. The lamp housing may be constructed so that space is naturally ventilated by the first and second openings. Additionally, a labyrinth arrangement or a filter arrangement can be used to govern the flow of air into the vehicle headlamp while excluding debris.