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:
Nov. 19, 1991
Filed:
Mar. 07, 1991
Minoru Oyama, Furukawa, JP;
Misturu Furudate, Furukawa, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
An illuminated electrical part comprises a case, an indicator panel attached to the open front end of the case, a housing attached to the case so as to define an illuminating space behind the indicator panel, and an illuminating device comprising a light source disposed behind the indicator panel and mounted on the housing, and a cover formed of a highly heat-conductive material, fixed to the housing so as to cover the light source and provided with light control slits in its top wall extending between the indicator panel and the light source and with light control apertures in its opposite side walls. The numbers, shape and arrangement of the light control sliuts and the light control apertures are determined selectively so that the entire area of the indicator panel is illuminated uniformly by light emitted by the light source, scattered by the inner surface of the housing and shed through the light control slits and the light control apertures.