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:
Sep. 01, 2009
Filed:
Dec. 14, 2005
Nobuhisa Kojima, Yokohama, JP;
Nobuhisa Kojima, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An illumination apparatus having a structure which can make the inside of the apparatus hard to be seen from the outside without deterioration of light distribution, and is applicable to illumination apparatuses having an optical member utilizing total reflection. The illumination apparatus comprises a light-emitting tube extending in a first direction; and an optical member including an entrance portion where a luminous flux from the light-emitting tube enters and an exit portion where the luminous flux exits. The exit portion includes a plurality of surfaces arranged in a second direction orthogonal to the first direction, the surfaces being orthogonal or inclined with respect to the optical axis direction, and located at different positions in the optical axis direction.