US2123942A

US2123942A - Ring-shaped element of prismatic section for improving the luminosity of electric lamps

Info

Publication number: US2123942A
Application number: US81838A
Authority: US
Inventors: Gunsbourg Arcadius
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-04-22
Filing date: 1936-05-26
Publication date: 1938-07-19
Anticipated expiration: 1955-07-19

Description

RING-SHAPED ELEMENT OF PRISMATIC SECTION FOR y 1938- A. G-UNSBOURG 2,123,942

IMPROVING THE LUMINOSITY OF ELECTRIC LAMPS Filed May 26, 1936 Patented July 19, 1938 UNITED STATES PATENT OFFIE Rl'NG- SHAPED ELEDIENT OF PRISMATIC Arcadius Gunsbourg, Brussels, Belgium Application May 26, In Belgium 2 Claims.

The present invention relates to a ring-shaped reflector element for improving the luminosity of electric lamps, by concentrating the light rays in a determined direction.

The invention has for its object to construct such ring-shaped element preferably in one piece and adapted to be directly supported by the bulb of an electric lamp.

Annular reflectors have been used with electric lamp bulbs, but they presented the drawback of requiring mechanical means for fixing the same to the lamps, and this constitutes a constructional complication. It has furthermore been proposed to use hollow cone-shaped reflectors melted on the lamp bulb or loosely put over it so that the hollow cone always extends below the source of light.

The present invention has for its object an annular reflector to be loosely mounted on an electric lamp bulb, formed of transparent or translucent material and having inner and outer coaxial and frustro-conical surfaces of revolution which diverge downwardly, the reflector being provided at its upper end with an integral collar to fit over the bulb.

The article will be made of glass or any other transparent or translucent material and this material may be colored. Between the support ing collar and the lamp bulb may be inserted adjusting elements having a resilient character or adapted to compensate for the volumetric modifications or expansions of the materials in contact, said elements being, for instance made of a metal foil, asbestos or like substance. Such insert elements may obviously be made as a reflecting surface, so as to constitute an auxiliary reflector capable of also directing the light rays in a convenient direction.

The inner or outer surface of the collar may be metallized, silvered, gilded or the like. The outer surface of the body may be coated with a reflecting material.

The invention will be described with reference to the accompanying drawing, in which two forms of embodiment are illustrated.

Fig. 1 is an axial section of the simplest form supported by a lamp bulb.

Fig. 2 is an axial section of a modified form of embodiment.

In Fig. 1, I designates the reflector with its downwardly diverging inner and outer coaxial surfaces of revolution, and I3 the collar sur- 1936, Serial No. 81,838 April 22, 1936 mounting the reflector. The axial section of the prismatic body is selected so as to produce the most efficient concentration of the light rays.

For the purpose of increasing the concentration of the light rays and reducing the diffusion of reflected rays, it is useful to multiply the reflection effect. Therefore, the outer surface of the circular reflector will be provided with a number of coaxially disposed annular facets. The number of annular facets is variable as are also their dimensions.

' Fig. 2 illustrates. diagrammatically such form of embodiment.

The outer surface of the reflector is composed of the coaxial frustro-conical surfaces 3, 4, 5, while the inner surface is frustro-conoidal. The arrangement will be preferably so that the rays 6, 'l, and 8, emitted for instance from the luminous source 9 of the lamp 2, produce reflected rays I0, II, l2, substantially parallel to each other.

Obviously, numerous constructional modifications may be introduced in the forms of embodiment illustrated. As stated herebefore, the inner or outer face of the suspending collar may be formed as a reflector; the outer face of the reflector body may also be coated so as to form a reflector; portions of the element may be frosted; the material, preferably glass, may have different degrees of transparency or coloration, so as to present an ornamental character. For varying the coloration, difierent compositions may be used, such as for instance the usual mixture for producing glass to which is added cobalt oxide, pigments, mercury salts, lead oxides and the like.

I claim:

1. An annular reflector to be loosely mounted on an electric lamp bulb, formed of lightpermeable material and having inner and outer coaxial and frustro-conical surfaces of revolution which diverge downwardly, the reflector being provided at its upper end with an integral collar to fit over the bulb.

2. An annular reflector to be loosely mounted on an electric lamp bulb, formed of transparent material and having inner and outer coaxial and frustro-conical surfaces of revolution which diverge downwardly, the outer surface being composed of a plurality of coaxial frustro-conical surfaces and the inner surface being frustroconoidal, the reflector being provided at its upper end with an integral collar to fit over the bulb.

' ARCADIUS GUNSBOURG.