Production of light from a fluorescent tube with reduction of th

Details Production of light from a fluorescent tube with reduction of th Production of light from a fluorescent tube with reduction of th

1983-09-14

1985-12-10

Nelson, Peter A.

Illumination

Elongated source light unit or support

With means to accommodate additional circuit element

362223, 362299, 362225, 362307, 362311, 362349, 362390, 362440, F21M 330

Patent

active

045584001

DESCRIPTION:

BRIEF SUMMARY
DEFINITION OF THE SYSTEM
rounded edges; lamp and a reflector; position of the discharge lamp; stepping up the mains voltage from 220 volts by means of auxiliary ignition anodes built into the potted electrodes of the discharge lamp.
It is well known that fluorescent light dazzles and overloads the iris of the human eye, because it is a line for which the glare factor is much larger than for a point light source. Line light sources have attained enormous importance because of their low mounting height despite the fact that the much greater glare of the line light source brought about an enormous expenditure of energy. To reduce the glare many lamp manufacturers went over to the use of energy-wasting filters.
Through the invention not only is the energy that is wasted in this way saved, but seeing conditions are created that are better than were previously known. The round tube profile is replaced by a triangular profile with rounded edges. This is all the more the case, since this triangular profile can be produced directly on the assembly line, i.e. can be drawn directly from the glass tank in finished form.
By means of mounting the tube with a triangular profile in such a way that the under surface is horizontal and the other two flat surfaces are pointing diagonally upward, a glaring light is made impossible.
Through the installation of a reflector with V-shaped ribbing running across the axis of the lamp and having flanks with an opening angle of 60.degree.-90.degree. inclined planes are formed on the basis of which the reflected light rays cross and are diffused and have the effect of enhancing the three-dimensonal appearance of illuminated objects. To increase the effect, the tooth flanks of the inclined planes are to be made of bare metal, polished, stretched out and anode brightened to attain a uniquely high efficiency.
The equilateral triangle shape used by itself, however, is completely effective only if the rooms that are supposed to be illuminated have ceilings with good reflective characteristics to return the light emitted by the upward-pointing surfaces to the viewer' level economically.
A white ceiling is inadequate if the distance between the tube lamp and the viewer level to be illuminated is too large. The reflective condition of the ceilings and walls, however, also limits the use of the triangular tubes alone.
In case in which the proposed triangular shape used alone is not sufficient to achieve the desired illumination, the new lighting system provides for a combination of liminaire and reflector. According to the invention this reflector is supposed to be designed in such a way that it also precludes so-called reflected glare. This objective is achieved if the reflector base has the appropriate structure. This is accomplished if V-ribs are stamped across the lamp axis to form inclined planes.
A further component of this lighting system is a wiring circuit that makes it possible to produce certain, instant ignition without stepping up the mains voltage from 220 volts.
The invention is described in greater detail with the aid of the illustrations
FIG. 1 shows a cross-section through one of the two ends of a discharge lamp,
FIG. 2 shows a side view of an endpiece of this discharge lamp in cross-section,
FIG. 3 shows a contact device of a socket in cross-section,
FIG. 4 shows a cross-section through the luminaire with the discharge lamp and reflector installed,
FIG. 5 shows a cross-section through reflector 18 in FIG. 4 A--A of the V-shaped ribs for forming inclined planes,
FIG. 6 shows a wiring diagram for the instant ignition and for steady state operation of a discharge lamp by means of ignition voltage without stepping up the line voltage of 220 volts through auxiliary ignition anodes for the potted electrodes (Be.sub.1 and Be.sub.2).
FIG. 6a protrays the left end part of the discharge lamp life size and shows the electrode position, especially with the auxiliary anode (ZA).
As one can see from FIG. 1, the discharge lamp 1 is shaped like an equilateral triangle with rounded edges and

REFERENCES:
patent: 2441456 (1948-05-01), Thayer
patent: 3510645 (1970-05-01), Siegel
patent: 3531687 (1970-09-01), Greber
patent: 4282564 (1981-08-01), McJunkin, Jr. et al.
patent: 4425603 (1984-01-01), Courson

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