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:
Feb. 21, 1989
Filed:
Apr. 29, 1988
Kosei Obata, Miyagi, JP;
Alps Electric Co., Ltd., , JP;
Abstract
An illuminating device for an electric part which can illuminate a light conducting member uniformly with a simple construction. The illuminating device comprises an annular filter having a light passing zone and a light absorbing zone formed at different circumferential portions thereof. The filter is located on a lower face of and positionable in a circumferential direction relative to a cylindrical light conducting member which surrounds a manually operable knob mounted for rotation relative to an operation panel. A light source is located below the light conducting member so that light emitted from the light source is transmitted to an upper end face of the operation panel by way of the filter and the light conducting member. The distribution of the light passing zone and the light absorbing zone of the filter is selected suitably so as to attain desired uniform illumination at the upper end face of the operation panel.