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Glass composition for a lamp, glass part for a lamp, lamp, and illumination device

A glass composition, a technology of glass for lamps, applied in lighting and heating equipment, parts of gas discharge lamps, lighting devices, etc., can solve problems such as crystallization and loss of transparency of glass

Inactive Publication Date: 2009-12-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that the addition of large amounts of SrO may lead to crystallization and thus loss of transparency of the glass

Method used

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  • Glass composition for a lamp, glass part for a lamp, lamp, and illumination device
  • Glass composition for a lamp, glass part for a lamp, lamp, and illumination device
  • Glass composition for a lamp, glass part for a lamp, lamp, and illumination device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0117] Figure 5 is a partial plan view of a circular fluorescent lamp according to Embodiment 1 of the present invention. Such as Figure 5 As shown in , the lamp 10 according to Embodiment 1 is a circular fluorescent lamp (FCL30ECW / 28) and has a circular glass bulb 20, a pair of luminous stems 30 and 30' sealed at each end of the glass bulb 20, and arranged Form the base 40 across the end of the glass bulb 20.

[0118] The glass bulb 20 is an example of the glass part used in the lamp according to the present embodiment, and is manufactured from the glass composition according to the present invention. The inner surface of the glass bulb 20 is coated with a protective layer (not shown) and a phosphor layer (not shown) in the specified order. A glass bulb 20 encloses a piece of amalgam 21 and an inert gas such as argon.

[0119] Figure 6 A diagram illustrating a glow tube connected to the front of a glass bulb. exist Figure 6 Among them, (a) shows the components form...

Embodiment approach 2

[0130] Figure 8 is a partial plan view schematically showing a cold cathode fluorescent lamp according to Embodiment 2 of the present invention. Such as Figure 8 As shown in , a cold cathode fluorescent lamp 60 according to Embodiment 2 has a glass bulb 61 which is a straight tube having a substantially circular diametrical section.

[0131] The glass bulb 61 is an example of a glass part according to the present invention, and is manufactured from the glass composition according to the present invention. The glass bulb 61 measures a length of 720 mm, an outer diameter of 4.0 mm and an inner diameter of 3.0 mm.

[0132] Lead wires 63 are sealed to each end of the glass bulb 61 via glass beads 62 . The lead 63 may consist of an inner lead made of tungsten and an outer lead made of nickel connected together. At the top of each inner lead, a cold cathode electrode 64 is fixedly arranged.

[0133] The glass bead 62 and the glass bulb 61 are connected to each other by, for e...

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Abstract

A glass composition contains the following constituents expressed in terms of oxides: 65wt% to 75wt% of SiO2; 1wt% to 5wt% of Al2O3; 0.5wt% to 5wt% of Li2O; 5wt% to 12wt% of Na2O; 3wt% to 7wt% of K2O; 12wt% to 18wt% of Li2O + Na2O + K2O; 2.1wt% to 7wt% of MgO; 2wt% to 7wt% of CaO; 0wt% to 0.9wt% of SrO; 7.1wt% to 12wt% of BaO; and substantially no PbO. The glass composition for a lamp is substantially lead-free, has an electrical insulation suitable for an illumination purpose, and further reduces the risk of devitrification.

Description

technical field [0001] The present invention relates to a glass composition for a lamp, a glass part for a lamp, a lamp and a lighting device. Background technique [0002] Generally, glass parts for lamps such as glass bulbs and flared stems are made of highly electrically insulating glass in order to prevent current from flowing through the glass parts. Current passing through glass parts may cause electrical shorts in lighting equipment or produce unusual heat that melts glass parts. [0003] A commonly used highly electrically insulating glass is so-called lead glass, which contains large amounts of PbO (lead oxide). However, since lead is a hazardous substance, the use of lead glass has been officially regulated in recent years. In an attempt to find an alternative glass that is electrically insulating similarly to lead glass, various glasses containing a large amount of SrO (strontium oxide) as a component for improving electrical insulation have been proposed (see P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/087F21S2/00H01J61/30H01K1/28
CPCH01J61/302C03C3/087C03C3/095G02B1/02
Inventor 户田淳子仁熊泰郎伊藤雅信
Owner PANASONIC CORP