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. 17, 1992
Filed:
Mar. 11, 1992
Takehisa Natori, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A light apparatus disclosed is high in utilization factor of light, simple in structure and suitable for mass production. The light apparatus includes a hollow single-part reflecting plate (11) having a spheroidal mirror on an inner face thereof and a discharge tube (13) mounted at a forward opening of the reflecting plate. The discharge tube has a double layer tube structure consisting of an elongated light emitting tube (16) and an outer tube (18) surrounding the light emitting tube. A reflecting face (26) is formed on the outer tube such that it connects to the spheroidal mirror to form a closed spheroidal face. The reflecting face is formed by mounting a cold mirror on a surface of the outer tube, and a light extracting portion (25) is formed on an outer wall of the outer tube by mounting a cold filter thereat. Light reflected from the light emitting tube is repetitively reflected by the reflecting plate and the reflecting face so that almost all of the light is discharged through the light extracting portion.