Illumination – Light source and modifier – Fluorescent type
Reexamination Certificate
1999-05-18
2001-06-12
Sember, Thomas M. (Department: 2875)
Illumination
Light source and modifier
Fluorescent type
C362S217060, C362S282000, C362S284000, C362S322000, C362S324000
Reexamination Certificate
active
06244729
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to improvements in lamp assemblies.
BACKGROUND OF THE INVENTION
Various lamps with adjustable reflectors are known, in which rigid parts of the reflectors are supported so that they can pivot around their longitudinal axis with respect to the fluorescent tube. As a result, it is possible to deflect the beam characteristic of the reflector part in question as a whole in different directions, that is, upward, to the side, or downward. With the known devices, however, it is not possible with the known reflector to vary the beam characteristic over a wide range, such as between a wide-beam and a narrow-beam characteristic, or to give it an asymmetric characteristic.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to improve lamps of the general type indicated above in such a way that the beam characteristic of the reflector can be varied in a predetermined pattern. To this end, in accordance with the present invention, the lamp comprises at least one long fluorescent tube and an elongated reflector of trough-like shape having a variable shape and including an adjusting device for selectively changing the position of the free longitudinal edges of the reflector which change forces a change in the shape of the reflector.
The shape of the reflector can be changed either by bending it or by dividing it into several lengthwise strips hinged together and by adjusting the angle of the strips with respect to each other. Thus, it is very easy to change the beam characteristic over a wide range. The adjusting devices for shifting the longitudinal edges of the reflector can be very easily designed to operate mechanically, electrically, or in some other way. In the case of elastically flexible reflectors, it is necessary in all cases to adjust both ends of the longitudinal edges to ensure that the curvature of the reflector in question is uniform over its entire length.
Advantageous embodiments and features of the present invention including various mechanical and/or motorized adjusting device, designs and reflector design described in more detail hereafter.
REFERENCES:
patent: 4872098 (1989-10-01), Romano
patent: 5855427 (1999-01-01), Lassovsky
patent: 6059435 (2000-05-01), Hamm et al.
patent: 7203765 (1972-12-01), None
patent: 2417605 (1974-10-01), None
Herbert Waldmann GmbH & Co.
Renz, Jr. , PC Eugene E.
Sember Thomas M.
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