JPS6410906B2 - - Google Patents

Description

[Detailed description of the invention] FIELD OF THE INVENTION The present invention relates to an incandescent light bulb.

As shown in FIG.
a pair of molybdenum metal foils 3 hermetically embedded in the press seal portion 1, and a pair of tungsten or molybdenum outer bulbs extending from the pair of metal foils 3 to the outside of the bulb. A conductive wire 4, a pair of inner conductive wires 5 made of tungsten or molybdenum extending from the pair of metal foils 3 into the inside of the bulb, a first filament 6a, an intermediate portion 6b, and a second filament stretched between the pair of inner conductive wires.
a coil assembly 6 consisting of a filament 6c;
An incandescent light bulb is known, which consists of a supporter member 7 whose tip 7a supports the intermediate part 6b and whose base 7b is fixed to the press seal part 1, and which has rare gas, halogen gas, etc. sealed in the bulb. be.

The above light bulbs are used in projectors, etc.
The bulk volume of the coil assembly is designed to be as small as possible, and the first and second filaments are usually formed into a coiled coil (so-called double coil), and the middle part is formed into a single coil to firmly support the coil assembly. For this purpose, conventionally, the core wire 8 is inserted into the intermediate portion, the intermediate portion 6b and the core wire are aligned, and the tip of the supporter member is wound and fixed around the center of the intermediate portion.

The above-mentioned incandescent light bulb has the disadvantage that the core wire 8 is slightly displaced in the insertion direction due to slight vibrations and shocks during transportation of the light bulb, resulting in disorder of the shape of the coil assembly.

An object of the present invention is to provide an incandescent light bulb that eliminates the above-mentioned drawbacks, and is characterized by: a bulb having a press-sealed portion at one end; and a pair of metal foils hermetically embedded in the press-sealed portion. , a pair of outer conducting wires extending from the pair of metal foils to the outside of the bulb, a pair of inner conducting wires extending from the pair of metal foils to the inside of the bulb, and a first filament and a single wire stretched between the pair of inner conducting wires. In the incandescent light bulb, the incandescent lamp comprises a coil assembly comprising a middle part of the coil and a second filament, and a supporter member whose tip part supports the center part of the middle part and whose base part is fixed to the press seal part, The distal end of the supporter member short-circuits the entire area of the intermediate portion with a first winding portion which is spirally wound to fill the gap between the pitches of the single coil at the same pitch as the pitch of the single coil at the intermediate portion, and further short-circuits the entire area of the intermediate portion. A second winding part is formed by spirally winding the winding part with the same pitch as that of the winding part so as to fill the gap between the winding parts.

Hereinafter, the inventive white light bulb will be explained using FIG. 2.

FIG. 2 is an explanatory view of the main parts of the inventive hot bulb, and the tip of the supporter member 7 is provided with a coil pitch that fills the gap in the middle part 6b of the coil assembly 6 formed into a single coil. The first winding part 7c short-circuits the entire area, and the end point 7'c of the first winding part 7c is further folded back to form the first winding part 7c.
A second winding part 7d is provided on top of c to fill the gap between the pitches, and the end point 7'd of the second winding part 7d is selected at the center of the intermediate part 6b. Then, pull it out in the direction of the press seal part 1 and fix the base part 7b to the press seal part 1. Therefore, the strands of the supporter member are folded back doubly and wound most densely around the strands of the intermediate portion 6b.

Since the present invention is as described above, the distal end of the supporter member and the intermediate part of the coil assembly are firmly fixed, and the coil assembly can be fixed without loosening due to slight vibrations or shocks during transportation of the bulb. No disturbance of the shape occurs at all.

Incidentally, by extending the starting point 7″c of the first winding portion 7c,
Of course, it may also be inserted into the remainder of the exhaust pipe (commonly known as the tip) 9.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional incandescent light bulb, and FIG. 2 is an explanatory diagram of the main parts of the inventive incandescent light bulb. In the figure, 7 indicates a supporter member.

Claims (1)

[Scope of Claims] 1. A valve having a press seal portion at one end, a pair of metal foils hermetically embedded in the press seal portion, and a pair of outer conductive wires extending from the pair of metal foils to the outside of the valve. A coil assembly comprising a pair of inner conductors extending from the pair of metal foils into the inside of the bulb, a first filament stretched between the pair of inner conductors, an intermediate portion of the single coil, and a second filament; It consists of a supporter member whose tip part supports the center part of the intermediate part and whose base part is fixed to the press seal part, and the tip part of the supporter member supports the coil at the same pitch as the single coil in the intermediate part The entire area of the middle part is short-circuited with the first winding part which is spirally wound so as to fill the gap between the pitches of the winding part, and the pitch of the winding part is further wound on the top of the first winding part with the same pitch as the pitch of the winding part. An incandescent light bulb characterized by comprising a second winding part spirally wound so as to fill the gap between the two windings.