Electric lamp and discharge devices – With gas or vapor – Having electrode lead-in or electrode support sealed to...
Reexamination Certificate
1998-10-06
2001-08-07
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Having electrode lead-in or electrode support sealed to...
C313S624000, C313S625000, C313S626000
Reexamination Certificate
active
06271627
ABSTRACT:
TECHNICAL FIELD
The invention relates to a sealing body for hermetic sealing of a tube lamp.
DESCRIPTION OF RELATED ART
A functional gradient material was formerly used as a sealing body in the sealed portions of a tube lamp such as a discharge lamp, an electric light bulb or the like. In a sealing body of this type an electrically conductive component and a dielectric component change continuous or incrementally. This property is suitable for a sealed arrangement of a discharge lamp or a filament lamp, i.e., for a feed arrangement as well as a hermetically sealed arrangement thereof.
Use of this functional gradient material as a sealing body for a tube lamp, such as a discharge lamp, a filament lamp or the like, yields the advantage that the length of the sealed portions (the feed sites as well as the hermetically sealed portions) can be shortened considerably more than in a conventional tube lamp. This prior art is for example known from documents WO 94/06947, WO 94/01884 and related others.
In a tube lamp of this type, in which a functional gradient material is used as a sealing body, the length of the sealed portions can be shortened. The result is the major advantage that the length of the entire tube lamp can be shortened. During operation of the lamp, the sealing body however reaches extremely high temperature and in this area oxidation occurs. In the sealing bodies outer leads are attached for purposes of supply such that they project outward. When an oxide is produced in the areas in which these outer leads are attached to the sealing bodies, the electrical contact resistance increases in these areas; this causes the disadvantage of shortened lamp service life. This disadvantage arises not just for a discharge lamp, but also for a filament lamp, such as a halogen lamp or the like.
DISCLOSURE OF THE INVENTION
In view of the body of prior art described above, as claimed in the invention a sealing body for a tube lamp which is described below is given.
(1) In a sealing body for a tube lamp, such as a discharge lamp, a filament lamp or the like, the invention is characterized in that it consists of a functional gradient material which is formed by mixing of a dielectric material and an electrically conductive material, the mixing ratios being different in the longitudinal direction continuously or incrementally, and in which one end forms a dielectric area and the other end forms an electrically conductive area and that at least one part of the external surface of this electrically conductive area and/or at least one part of the outer lead projecting out of this sealing body is jacketed with an atmosphere shielding layer.
(2) The invention is furthermore characterized in that in the design described above (1) the atmosphere shielding layer is made of glass, a thin layer of a metal such as platinum, gold, rhodium, iridium, rhenium or chromium or a metal compound such metal oxide.
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Microfilm of the Specification and Drawing Sannexed to the Request of Japanese Utilitymodel Application No. 163134/1982, (Laid-Open No. 67855/1984) (Iwasaki Electric Co., LTD.), May 8, 1984, Claim 1, p. 5, Lines 10 to 16; Fig. 2, (Family: None).
Mituhashi Kenichi
Miyanaga Shoji
Mori Kazuyuki
Morimoto Yukihiro
Nixon & Peabody LLP
Patel Nimeshkumar D.
Safran David S.
Santiago Mariceli
Ushiodenki Kabushiki Kaisha
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