JPS62154452A - Incandescent lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement in the construction of an incandescent light bulb having a tungsten filament connected parallel to the central axis of the glass bulb.

[Technical background of the invention and its problems]

Incandescent light bulbs have a tungsten filament connected to an internal lead planted in the stem inside the glass bulb. Some have a structure in which tungsten filaments are connected parallel to the axis. Light bulbs with this structure use both long and short internal leads to which the tungsten filament is connected, so if the bulb is subjected to an external shock, etc., the long internal lead may be used. If the same metal wire is used for the short internal lead, the amount of displacement at the tip of the long internal lead is greater than that of the short internal lead. There is a risk that the tungsten filament may be deformed due to the difference in displacement at the tip of the long internal lead and the short internal lead, so to prevent this, a material with strong elasticity and high rigidity is used. was.

The above stiffness number is specified by the American Society for Testing and Materials (ASTM) specification D747.
Stiffness is a value obtained by calculating from the torque measured by Te5ter, and the larger the value, the higher the tensile strength of the metal wire.

However, in the case of long and short internal leads as mentioned above, even if one with a large stiffness number is used, the individual natural frequencies are different, so they are weak against vibration and cause anharmonic vibration, for example. There was a problem in that low-power tungsten filaments with small wire diameters were prone to disconnection accidents.

[Purpose of the invention]

The present invention has been made to address the above-mentioned conventional problems, and is an improved tungsten filament that is resistant to vibrations and shocks and can prevent the occurrence of wire breakage. The purpose is to provide an incandescent light bulb.

[Summary of the invention]

In the present invention, a tungsten filament is connected parallel to the central axis of a glass bulb, and the long and short internal leads to which the tungsten filament is connected are formed by a metal wire having a higher rigidity on the long side than on the short side. This is an incandescent light bulb characterized by the following structure.

[Funny example of invention]

The details of the invention will now be explained with reference to an embodiment of the inventive incandescent lamp shown in the accompanying drawings.

The figure is a front view of one embodiment of the inventive hot bulb, in which a stem (2) is sealed to the end of a glass bulb (1) and a mount (3) is enclosed. A cap (4) is sealed at the end of the glass bulb (1) to which the stem (2) is sealed, and the eyelet glass (5) of the cap (4) is sealed.
An external lead (not shown) is led out from the mount (3) to the shell (6) and the eyelet (7), which are insulated by the shell (6) and the eyelet (7).

) are electrically conductively connected to each other. Mount (3)
has 2 long internal leads (8) and a short internal I lead.
J + do (9) is planted on the stem (2), and the internal leads (8) and (9) are connected to a coiled tungsten filament αB = parallel to the central axis of the glass bulb (1). The wire is formed as shown in the figure, and a tungsten filament α is connected to the end of the wire. For example, the long internal lead (8) has a rigidity of 2.
50, and a short internal reel 9) with a stiffness number of 150 is used.

In the incandescent light bulb of the present invention, the longer internal lead of the tungsten filament connected parallel to the central axis of the glass bulb is made of a metal wire that has a higher rigidity than the shorter internal lead, so that it does not harmonize with both internal leads. It is possible to prevent the occurrence of vibrations, and the impact and vibrations applied to the tungsten filament are significantly reduced, thereby preventing the tungsten filament from breaking.

In addition, in the tests conducted by the present inventors, the stiffness of the internal lead was 20.
Rigidity number on the short side is about 0 to 300, 100 to 2
00 and the stiffness number on the long side is about 50 to 100 greater than the stiffness number on the short side, which gave preferable results.

In addition, as a means for providing a difference in the number of rigidities between the long side and the short side of the internal lead, the material, diameter, cross-sectional shape, etc. of the internal lead may be varied and selected as appropriate depending on the type of light bulb.

〔Effect of the invention〕

In the present invention, a tungsten filament is connected parallel to the central axis of the glass bulb, and the long and short internal leads to which the tungsten filament is connected are formed by a metal wire having a higher rigidity on the long side than on the short side. An incandescent light bulb characterized in that the long internal lead and the short internal lead can be prevented from disharmoniously vibrating,
As a result, it is possible to achieve the excellent effect of eliminating the occurrence of fatal accidents such as tungsten filaments having a small wire diameter breaking due to shock or vibration.

[Brief explanation of drawings]

The figure is a front view of one embodiment of the inventive incandescent light bulb. 1...Glass bulb, 2...Stem. 3...Mount, 4...Base. 8...Long internal lead. 9...Short internal lead.

Claims (1)

[Claims] In a glass bulb in which a tungsten filament placed parallel to the central axis of the bulb is connected to long and short internal leads, the long side of the internal lead has a higher rigidity than the short side. An incandescent light bulb characterized by being constructed of tall metal wire.