Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Reflector
Patent
1995-10-23
1998-03-17
Patel, Nimeshkumar
Electric lamp and discharge devices
With optical device or special ray transmissive envelope
Reflector
313634, H01J 6130
Patent
active
057290792
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a compact fluorescent light bulb.
The light bulb of the invention is an improved version of a compact fluorescent light bulb, especially a reflector lamp, which can be used as an energy-saving alternative to the general-purpose incandescent light bulb in ceilings and chandeliers.
BACKGROUND
In ceilings and chandeliers, commercially available compact fluorescent light bulbs, of the kind described for instance in European Patent EPO 143 419, to which U.S. Pat. No. 4,853,591, corresponds, are used virtually exclusively in a suspended position; that is, the U-shaped parts of the tube that form the discharge vessel of the compact fluorescent light bulb are oriented vertically. These compact fluorescent light bulbs, in a suspended operating position, thus produce a high vertical lighting intensity, or in other words a high lighting intensity for vertical surfaces, such as walls, but only a relatively low lighting intensity for horizontal surfaces such as table tops and floors. As a result, that compact fluorescent light bulbs that are used in a suspended operating position in chandeliers or ceiling lights may not illuminate the table and floor adequately. Moreover, in light fixtures that can be looked into from the side, the high vertical light intensity of the discharge vessel can be quite blinding to the observer when he looks at the light fixture.
International Design Application IR-DM/007715 discloses a compact fluorescent light bulb with a rotationally symmetrical funnel-shaped aluminum reflector in which the light bulb is retained axially. This compact fluorescent light bulb, provided with a reflector, does produce high horizontal lighting intensity, but because of its great structural length it is unsuitable for ceilings and chandeliers. The structural length of a compact 15 W fluorescent light bulb with its reflector is 152 mm, for instance, and the structural length of a compact 20 W fluorescent light bulb with its reflector is 186 mm. By comparison, the length of a general-purpose 60 W incandescent bulb is only 105 mm.
German Patent Disclosure DE-OS 31 06 721, to which U.S. Pat. No. 4,871,942 corresponds, describes a pressed glass light bulb formed as a compact fluorescent light bulb. In one exemplary embodiment (FIGS. 6 and 7), this light bulb has a rotationally symmetrical, funnel-like housing that encloses a ballast and has a screw-type base. The discharge vessel comprises two pressed glass parts, which are joined together in gas-tight fashion by means of a glass enamel.
A zigzag-shaped pressed glass part located inside the discharge vessel divides the discharge chamber and forms a coiled discharge path extending at right angles to the axis of the bulb.
Making this light bulb using the pressed glass technique is comparatively complicated and expensive. Applying a slurry of fluorescent material to the pressed glass parts, inserting the electrodes, and sealing off the pressed glass parts that form the discharge vessel in gas-tight fashion are especially problematic.
THE INVENTION
The object of the invention is to furnish a compact fluorescent light bulb which is suitable in a suspended operating position as a replacement for a general-purpose incandescent bulb for use in a ceiling fixture or chandelier, has a high horizontal lighting intensity, and has the least possible blinding effect.
Tubular segments of the discharge vessel located adjacent each other, which extend vertically to the lamp, and hence the reflector axis, together with the reflector generate a horizontal lighting intensity that is improved by a factor of four over conventional compact fluorescent light bulbs, with little glare. The discharge vessel advantageously comprises a plurality of U-shaped glass tubes, which are located side by side in the same plane at right angles to the reflector axis. As a result, these glass tubes and especially their legs form a flat discharge vessel, which acts as a flat projector and makes a short structural length possible for the light bulb of the
REFERENCES:
patent: 4282563 (1981-08-01), Ohta et al.
patent: 4420799 (1983-12-01), Miller
patent: 4853591 (1989-08-01), Klein et al.
patent: 4871942 (1989-10-01), Burgmans et al.
"Neues aus der Technik" (News about Technology), vol. 2, May 20, 1988, Wuurg, Germany, p. 4, Niederdruck-Quecksilberdampf-Entladungslampe (Low-Pressure Mercury-Vapor Discharge Lamp).
Patel Nimeshkumar
Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
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