Fluorescent lamp and method for manufacturing it
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasao Honmou, Kazumasa Kobayashi, Akihito Wakamiya
Life of this patent
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Abstract
A fluorescent lamp has an amalgam container settled inside an exhaust pipe extending from an end portion of a bulb to which electrodes are attached at both end portions. The amalgam container contains amalgam inside and has an opening portion through which the contained amalgam cannot go out and a part for determining the position of the amalgam, wherein the opening portion is located on the side where the exhaust pipe is cut and sealed. This configuration makes it possible to prevent the amalgam from outflowing into an exhaust equipment. In addition, the mercury vapor pressure is maintained optimally, and high luminous efficiency is obtained.
Claims5
A fluorescent lamp comprising an amalgam container, which is settled inside an exhaust pipe extending from an end portion of a bulb to which electrodes are attached at both end portions, the amalgam container containing amalgam inside and having an opening portion through which the amalgam cannot go out and a part for determining the position of the amalgam, wherein the opening portion is located on the side where the exhaust pipe is cut and sealed and a distance between the amalgam and the electrode is in the range between 20 mm and 50 mm.
A method for manufacturing a fluorescent lamp having an amalgam container, which is settled inside an exhaust pipe extending from an end portion of a bulb to which electrodes are attached at both end portions, the amalgam container containing amalgam inside and having an opening portion through which the amalgam cannot go out and a part for determining the position of the amalgam, wherein the opening portion is located on the side where the exhaust pipe is cut and sealed and a distance between the amalgam and the electrode is in the range between 20 mm and 50 mm, the method comprising
- (a) exhausting air contained in the bulb and (b) cutting and sealing the exhaust pipe after the step (a), wherein the amalgam container containing the amalgam is settled in the exhaust pipe at a point of change from the step (a) to the step (b), and the amalgam container is provided with the opening portion before it is settled in the exhaust pipe.
Dependencies are inferred from the claim text.