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Fluorescent lamp

A technology for fluorescent lamps and phosphor layers, applied in the field of fluorescent lamps, can solve the problems of cracks in the protective layer, inability to firmly bond the phosphor layers, and easy peeling of the phosphor layers.

Inactive Publication Date: 2006-01-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, if the protective layer becomes thick, cracks may be caused on the protective layer, and thus the phosphor layer formed on the protective layer is easily peeled off.
Therefore, if the protective layer becomes thick, it will be difficult to use a material including aluminum oxide as a main component of the protective layer, since this material cannot be firmly bonded to the phosphor layer

Method used

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  • Fluorescent lamp
  • Fluorescent lamp
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Embodiment Construction

[0038] A circular fluorescent lamp according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

[0039] (1) Fluorescent lamp structure

[0040] Fig. 1 includes a partially cutaway plan view of an annular fluorescent lamp according to an embodiment of the present invention and an enlarged schematic cross-sectional view of the cutaway portion. As shown in FIG. 1, a fluorescent lamp 1 according to an embodiment of the present invention is a circular fluorescent lamp which consumes 30 watts and encapsulates granular tin amalgam 2 therein for supplying mercury and argon as a rare gas.

[0041] The fluorescent lamp 1 comprises an annular glass bulb 3 . The glass bulb 3 is made of soda lime glass. The inner diameter of the glass bulb is 28 mm. The wall thickness of the glass bulb 3 is 1.0 mm. The length in the direction of the bubble axis is 540 mm.

[0042] An electrode 4 is placed on each end of the glass bu...

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Abstract

A fluorescent lamp comprises a glass bubble body, mercury which is encapsulated inside the glass bubble body with the content between 2.2 gamma / cm<3> and 8.8gamma / cm<3>, rare gas encapsulated inside the glass bubble body, an electrode connected with the glass bubble body, a protective layer which is formed at the inner surface of the glass bubble body and comprises metal oxide granules and at least 50wt percent of silica, the thickness of the protective layer is between 0.5 micron to 5.0 microns, and a phosphor layer formed at the protective layer.

Description

technical field [0001] The invention relates to a fluorescent lamp. Background technique [0002] For fluorescent lamps, mercury is the base material for the discharge gas and the source of ultraviolet light that excites the phosphor. However, mercury reacts with the alkali metal flowing out of the glass bulb and gradually loses its activity during illumination (this phenomenon causing the loss of activity will be referred to as "mercury consumption" hereinafter). Therefore, the mercury that contributes to the luminescence is consumed. This reduces the luminous flux. [0003] Traditionally, in order to prevent the reaction of mercury and alkali metals, a protective layer is formed between the glass bulb and the phosphor layer. For example, Japanese Laid-Open Patent Application Publication No. 10-125282 discloses an alumina protective layer. At the same time, pre-encapsulation with additional mercury is traditionally carried out in view of the consumption of mercury. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J65/04
Inventor 稻垣文拓滨政明
Owner PANASONIC CORP