DE1236435B - Electric light bulb designed as a headlight - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

F21m

German class: 4b-11/01

Number: 1236 435

File number: A39969IXa / 4b

Filing date: April 17, 1962

Open date: March 16, 1967

The invention relates to an electric incandescent lamp designed as a headlight and having a bulb two glass bowls fused at their edges to form an airtight hollow body, of which the one is translucent, while the other glass bowl is provided with a reflector on its inner surface is, and with one of supply lines that pass through openings on the edge of the wall with the Reflector-provided glass bowl are inserted into the hollow body, carried filament, the Glass bowl with the reflector is shaped in such a way that the light falling from the filament on the reflector is reflected as a converging bundle of rays through the translucent glass shell.

In known headlights of this type, the reflector extends to the edge of the reflector support. Through this arises when the supply lines melt down near the reflector edge, especially when they are be distributed symmetrically over the entire circumference of the reflector support, the risk that the reflector surface is disturbed or distorted in a relatively large area. So you can start and thereby become blind, throw oneself or be interrupted by the supply line openings. This either makes part of the reflector ineffective or the light at the edge of the reflector not reflected in the desired direction.

According to the invention, this disadvantage is eliminated in that all leads to the filament one in one, e.g. B. upper, area of the reflector support arranged reflector-free extended Wall part of the reflector support are passed through thickened approaches and thereby the plane of the edge fusion seam between the reflector support and the translucent glass bowl to the optical axis of the Reflector is inclined.

The reflector support preferably assumes an angle of more than 180 ° in that plane, which on the one hand contains the optical axis of the reflector and on the other hand on that plane perpendicular stands, in which the edge fusion seam runs between reflector support and cover. This results in a maximum reflective area and a minimum disturbance of the reflector in the section around around the optical axis.

The invention will be explained in more detail with reference to the drawing of an exemplary embodiment.

Fig. 1 shows a cross section through an incandescent lamp headlight. The cut goes through the optical axis of the reflector. In the state shown, the two glass bowls are not yet together merged;

Electric, designed as headlights
Lightbulb

Applicant:

Associated Electrical Industries Limited, London Representative:

Dr.-Ing. W. Reichel, patent attorney,
Frankfurt / M., Parkstr. 13th

Named as inventor:
John Willoughby,
Thomas Wright,

Leicester, Leicestershire (UK)

Claimed priority:

Great Britain April 18, 1961 (13 967)

FIG. 2 is a side view of the headlamp, from the left in FIG. 1 seen.

The lamp bulb of the headlamp is made of two glass shells, one of which is provided as a reflector support on its inner surface with a reflector 3 , while the other serves as a cover 2 or light exit window.

The reflector support and the cover 2 are fused together at their edge 4 , so that an airtight hollow body is formed. A reflector-free extension wall of the reflector support 1 is reinforced by a shoulder 8 and provided with openings. At the edge of the openings, brackets 7 made of metal are melted, to which supply lines 6 are connected, which protrude through the openings into the hollow body. The filament 5 is attached to the ends of the leads 6 in the hollow body.

The edge fusion seam 4 between the reflector support 1 and cover 2 lies in a plane 9 a which is inclined to the optical axis 9 of the reflector 3. The reflector support extension wall is located between the plane 9 a and a further plane 10 which is perpendicular to the optical axis of the reflector. The line of intersection of the two planes 9 a and 10 forms a tangent to the edge fusion seam 4. Between the planes 9 α and 10 a wedge-shaped space is enclosed, the cross section of which in a plane 11 containing the axis 9 is approximately triangular

709 519/72

Claims (1)

I 236 is. The approach 8 is at the base of the triangle. The brackets 7 are arranged symmetrically on both sides of the plane. The plane contains the optical axis 9 of the reflector support 1 and is also perpendicular to the plane 9 a. The reflector support extends over an angle of more than 180 ° in the plane 11. Thus, the cover 2 only occupies an angle of less than 180 ° in the plane 11. This results in a maximum reflecting area and a minimum disturbance of the reflector 3 in the section around the optical axis. The angle taken by the reflector support is preferably approximately 240 ° and that of the cover 2 is approximately 120 °. In the exemplary embodiment shown, the plane 9 a, in which the edge fusion seam 4 lies, intersects the plane 10 in a tangent to the edge fusion seam 4, but it is also possible to lay the planes in such a way that the cutting line forms a chord to the edge fusion seam 4, provided that the base of the wedge-shaped space between these planes is so large that the extension 8 carrying the holder 7 fits into it. The reflector 3 is preferably elliptical, while the cover 2 has the shape of a spherical shell. The filament 5 is in common Focal point of the elliptical reflector 3 and the spherical shell-shaped inner surface of the cover 2 are provided. The light emanating from the filament 5 and reflected on the inner surface of the cover 2 is over thrown the filament on the reflector 3 and runs with that of the filament 5 directly on the reflector 3 thrown light rays in a point on the optical axis 9 in front of the cover 2 together. It is true that a small proportion of the light reflected by the reflector 3 is also returned to the cover 2 reflected, but the largest portion of the cover 2 is transmitted. Because the brackets 7 in the extension 8 are a relatively large distance from the reflector 3 it is ensured that the shaped surface of the reflector 3 is not disturbed when it is melted down will. F i g. 1 shows the reflector support 1 and the cover before melting together. When melting together, the adjoining edges sink together at a point 12. The mutual position of reflector support 1 and cover 2 is, however, precisely defined by the contact of a shoulder 13 of cover 2 with an edge 14 of reflector support 1. In the embodiment described, especially elliptical reflectors can be used, which Let light rays converge a short distance in front of the cover 2 in a focal point, so that the Approach 8 is not in the light cone of the light reflected by the reflector 3. Claim: Electric incandescent lamp designed as a headlight with a bulb of two on theirs The edges of glass bowls fused to form an airtight hollow body, one of which is translucent, while the other glass bowl on its inner surface with a reflector is provided, and with one of supply lines that pass through openings on the edge of the wall of the with the reflector provided glass bowl are inserted into the hollow body, worn filament, wherein the glass bowl with the reflector is shaped in such a way that the filament on Light falling on the reflector is reflected outwards through the translucent glass shell as a converging bundle of rays, thereby characterized in that all leads to the filament are connected to one in one, e.g. B. upper, area of the reflector support (1) arranged reflector-free extended wall part of the reflector support are passed through thickened lugs (8) and thereby the plane (9 a) of the edge fusion seam (4) between the reflector support and the translucent glass bowl (2) to the optical axis (9) of the reflector is inclined. Considered publications:
German Patent No. 813 278;
U.S. Patent Nos. 2114,350, 2,543,093. 1 sheet of drawings 709 519/72 3.67 © Bundesdruckerei Berlin