Illumination – Light source and modifier – Including reflector
Patent
1992-12-02
1995-11-14
Lazarus, Ira S.
Illumination
Light source and modifier
Including reflector
362329, 362311, F21V 302
Patent
active
054672597
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to lamps, and in particular to low voltage reflector lamps.
Low voltage reflector lamps are employed in applications such as display lighting where a low power consumption, long lamp-life and an acceptable thermal performance are required.
Known low voltage reflector lamps are available wherein the reflector is designed to direct light precisely, permitting highlighting and profiling and a well controlled beam of light in addition to producing a pleasing environment.
Such lamps may be manufactured to incorporate a curved or flat glass front which serves as a protective feature. It protects the bulb and reflector surface from harsh environments. Such lamps are produced by GE Thorn Lamps Limited.
In addition, it is possible to obtain attachments for such lamps which serve as a decorative appendage. However, such attachments, as provided by GE Thorn Lamps limited, require a special adaptor such that the decorative attachment may easily be added to a fitting in which the existing lamp is located. In order to install such a lamp the relatively expensive adaptor must necessarily be purchased in addition to the lamp unit.
SUMMARY OF THE INVENTION
An object of the invention is to provide a unitary lamp assembly incorporating a decorative appendage.
According to the invention there is provided a low voltage reflector lamp comprising a bowl-shaped reflector symmetrically disposed about an optical axis and having an annular rim, a low voltage light source permanently located within the reflector at a predetermined position, and a transparent or translucent appendage located at the annular rim, characterised in that the said appendage has a rim at an annular edge of complementary size to that of the annular rim of the reflector, and in that an annular fixing means having two inwardly directed flanges is provided, which flanges axially engage the rims of said reflector and said appendage and which by being pressed or rolled hold said rims together to secure said appendage rigidly and permanently to said reflector.
The reflector and decorative appendage may be formed separately and permanently joined after location of the light source. Should the lamp require replacement, the entire lamp including the decorative appendage may be replaced as a single unit.
The invention will now be described by way of example with reference to the accompanying drawings.
DESCRIPTION OF THE FIGURES
FIG. 1 is a part elevation and part section of a first embodiment of a lamp assembly in accordance with the invention having an open ended tubular appendage narrowing slightly in the direction of the projected beam,
FIG. 2 is an elevation of a second embodiment having a tubular appendage similar to that shown in FIG. 1 modified by an oblique end surface, and
FIGS. 3, 4 and 5 show further embodiments in which the various appendages are closed at their lower ends.
FIG. 6 shows in part elevation and part section an alternative construction for attachment of the appendage in the lamp assembly.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the arrangement shown in each of the embodiments there comprises a reflector lamp 10 Comprising a bowl-shaped reflector 11 symmetrically disposed about an optical axis, and a light source 12 in the form of a low-voltage tungsten halogen lamp located permanently at a defined position. The bowl is formed with a multi-faceted reflector surface moulded (for example in honeycomb pattern 13 or a rectangular pattern) on the inner surface of the bowl. A reflective coating on the inner surface serves to allow most of the heat to pass backwards through the reflector shell whilst directing the beam forwards.
The exterior surface of the bowl may be plain or preferably slightly crinkled in which case with the reflector 11 being moulded in transparent glass or plastics the facet pattern 13 appears hazy or slightly out of focus to the eye.
In the examples shown in FIGS. 1 and 2 the open end of the reflector 11 is closed by a plain dished lens 15 which seats in a recess 16 formed in a flange 17
REFERENCES:
patent: 2802097 (1957-08-01), Franck
patent: 3483365 (1969-12-01), Starr
patent: 4323956 (1982-04-01), Pustka
patent: 4914342 (1990-04-01), Mujahid et al.
Felstead Richard A.
Hume Roger A.
GE Lighting Limited
Lazarus Ira S.
Raab Sara
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