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:
Apr. 24, 2001
Filed:
Jun. 11, 1997
Seiko Epson Corporation, Tokyo, JP;
Abstract
Concerning a lamp unit which is used as a light source of an image reading apparatus, there is provided a lamp unit which reduces a change over time in the quantity of light. The lamp unit is provided with a hollow cylindrical gas-filled tube in which a gas is filled; a pair of electrodes which are secured to an outer peripheral surface of the gas-filled tube and extend in the longitudinal direction of the gas-filled tube in a mutually opposing state; an electrically insulating cladding tube surrounding the electrodes and the gas-filled tube; and a heat-accumulating member provided in contact with an outer peripheral surface of the cladding tube and extending in the longitudinal direction of the cladding tube.