SU860175A1 - Method of manufacturing superminiature incandescent lamps with loop-like lamp filament - Google Patents

Description

The invention relates to the electrical industry and can be used in the manufacture of miniature incandescent lamps. A known method of manufacturing a miniature incandescent lamp is that the tungsten coil is attached to the electrode holders welded to the glass bead. In order to fasten longer spirals, additional supports are used which are welded on the leg bead, along with electrodes. In this case, the installation of the spiral also includes fixing the frame spiral in the support hook. The bead stem thus obtained is inserted into a glass tube and sealed in it, after which the tube is pumped out and sealed on the other side | . However, this method of manufacturing is subminiature ;: lamps are low-producing and labor-intensive due to the complexity of installation operations, requiring large amounts of manual labor. The method according to which a straight piece of monospirach with an engraved core bends the V-shaped loop closest to the proposed technical essence The free end of which is attached to a temporary holder, for example, machine pliers or a strip of metal. The bent portion of the loop is immersed in the etching solution. The spiral body of the heat is obtained by etching the core from the bent part of the loop. The straight parts of the helix with the uncorrected core are used as leads. After drying, the coil is introduced into the glass tube-flask, brewed in it, the tube is pumped out and sealed off from the other end 2. However, the known method provides for the manufacture of only low-voltage super-microns: 1 tube lamps designed for a supply voltage not exceeding IG V. This is due to The fact that in lamps designed for a supply voltage of 10 V should be used a long (more than 2 mm) helix requiring an increase in the resistance of the filament body while limiting the diameter of the tungsten wire to 2-5 microns, since tion of thinner wires difficult. The manufacture of lamps for the supply voltage of a BbiBie 10 V in a known manner is not possible, since the filament body is made too long to keep the shape of a V-shaped loop without the aid of a supporting element. The purpose of the invention is to increase the shape of the body heat. This goal is achieved by the fact that in the known method of producing ultra-miniature lamps, including forming a V-shaped loop from a straight segment of a helix wound onto a core, obtaining a glowing body by coring core from a bent portion of the loop, welding the straight loop portions in a glass tube and evacuating the core the pipe tap-off before coring on the filament body establishes support that is resistant to the effect of the etching solution.

When using a support from a core material, its diameter should be greater than the diameter of the core so that the support needed to etch the core during the time required for coring only partially. The diameter of the support of the spiral material is arbitrary.

FIG. 1-5 depict a sequence of ocerations produced by the proposed ultra-miniature incandescent lamp. In the manufacture of a lamp for a supply voltage of 28 V, a power of 1.2 W and a light output of 5 lm / W, the tungsten coil 1 on molybdenum core 20 having undergone chemical cleaning and annealing by rewinding in a hydrogen medium is molded into a V-shaped loop (.ig. one ). In order to fix the shape of the loop, it is additionally subjected to high-temperature annealing in a vacuum furnace. At the top of the folded loop 3, support 4 is fixed (figure 2, after which chemical protection is applied to the straight sections of the loop — a solution of bitumen in trichloro Formula of the invention

A method of manufacturing subminiature incandescent lamps with a looped filament body, including vacuuming a V-shaped loop from a straight piece of a spiral-wound core, etching the core from the spiral with the exception of its ends, welding the loop in a glass tube, pumping and tapping the tube, in that , in order to increase the shape-stability of the incandescent body, before etching the core on the incandescent body, support is established that is resistant to the effect of the etching solution.

Sources of information taken into account in the examination

1. Technological process of manufacturing the product of an incandescent electric subminiature lamp without media base 6, JUS 01201 00016.

2. US patent number 3863314, cl. 29-25.15, opzblik. 1976. 54 ethylene. No support is applied to the support 4 and the bent portion 3 of the loop. After the protection has dried, the loop, together with the support with its free ends, is clamped into the pincers of the semiautomatic machine, and the area of the bent section 3 of the loop with support 4 fixed on it is placed in the etching solution 5, where the core 2 (FIG. 3 is completely etched out of the unprotected loop section 3.) the linear portions of the loop used as electrodes are removed by chemical cleaning. A helix (Fig. A) is placed in the glass tube 6 and sealed therein, after which (Fig. 5) the tube is pumped out and sealed off from the other end. The support is made of spiral material, i.e. tungsten. The use of the proposed method of manufacturing ultraminiature incandescent lamps provides, in comparison with known methods, the possibility of producing ultraminiature incandescent lamps 1i with a V-shaped filament body and a supply voltage of 20-30 V; and reducing scrap by simplifying the manufacturing process to help automate the manufacture of subminiature incandescent lamps.

fig 1

(Put. 2

(rig 3

ig. f

Uf s

Claims (1)

Claim A method of manufacturing subminiature incandescent lamps with a loop-like body of incandescence, including the formation of a V-shaped loop from a straight piece of a spiral-wound core, etching the core out of the spiral, except for its ends, welding the loop in a glass tube, evacuating and tapping the tube, characterized in that in order to increase the shape-stability of the incandescent body, before etching the core on the incandescent body, support is established that is resistant to the effect of the etching solution.