Luminaire with a rodlike lamp and lamella segment therefore

Details Luminaire with a rodlike lamp and lamella segment therefore Luminaire with a rodlike lamp and lamella segment therefore

1985-12-17

1988-01-05

Cuchlinski, Jr., William A.

Illumination

Elongated source light unit or support

Housing

362255, 362290, 362342, F21V 700

Patent

active

047179929

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns a luminaire with a rodlike lamp and moreover of the type described in the initial phrases of the appended claim 1 and a lamellar segment for use in such a luminaire.
Because a rodlike lamp emits light not only in all radial directions but also in axial direction it is aimed to design luminaries in such a way that the light radiated is deflected under maximum utilization and in such a way as to obtain illumination of interiors, workstations and the like with as little glare as possible.
To deflect the radially emitted light a longitudinally extending reflector is arranged parallel to the lamp and on that side of the lamp which is opposite to the area to be illuminated. However, such a reflector also reflects the axially emitted light without directing this in the direction desired.
Therefore it has up till now been customary to arrange a lamellar louver at the light output side of the luminaire.
One drawback of such arrangements is that the lamellas themselves influence the reflected radiation causing mislead radiation at the topsides of the lamellas.
To avoid this the topsides of the lamellas have been blackened which, however, causes a loss of light. Complicated lamellas designed for an improved directing of the radiation have also been employed but these have been costly in production.
One common drawback for all these arrangements is the considerable constructional height of the luminaire which is caused by the arranging of lamellas at the light output side for which reason the lamella arrangements have been left out entirely in cases where a reduced constructional height or a simple construction was a must.
It is the aim of the invention starting from this state of art to provide a simple protection against longitudinal glare for a luminaire with a rodlike lamp that can be manufactured at low cost and can replace the formerly used, complicated, costly in production and bulky lamella arrangements; further the glare protection is aimed to be to a large extent independent of the construction of the luminaire making it possible to provide even very flat luminaires with the longitudinal glare protection.
This is achieved with the distinctive features listed in the characterizing part of the appended claim 1. Thus the lamellas according to the invention are not arranged at a distance in front of the lamp at the lightoutput side as being the case in the prior art. On the contrary the lamellas are arranged adjacent to and around the surface of the lamp making it possible to reduce the constructional height for the luminaire as a whole.
The lamellas may be mounted around the lamp suspended in their own carrier devices. However, according to one embodiment of the invention the lamellas are carried by the lamp itself, the lamellas surrounding the lamp at virtually no distance and substantially in the circumferential direction.
The lamellas themselves are reflective, e.g., with reflective coating. The lamellas reflect the light emitted according to the reflective coating which may be mat or lustrous essentially without loss and without being translucent to the light to any substantial degree.
The distance between and the radial height of the lamellas are adapted to ensure that a light beam emitted from the lamp in an axial plane at the base of a lamella close to the surface of the lamp and passing just over the top of the outer edge of an adjacent lamella has just an acceptable angular direction relative to the longitudinal axis of the lamp.
Because of the arrangement of the lamellas immediately at or on the lamp any other form of lamella arrangement placed at the luminaire is rendered superfluous and thus it is sufficient to provide the luminaire with a usual reflector to deflect the radially emitted radiation.
The lamellas as such are preferably manufactured from a low cost and easily manufacture plastic material making it feasible to renew the lamella arrangement according to the invention at the occasion of replacing a burned out lamp replacing completely the formerly necessary d

REFERENCES:
patent: 2319572 (1943-05-01), Wilson
patent: 2429141 (1947-10-01), Taylor
patent: 2537398 (1951-01-01), Dameral
patent: 4539628 (1985-09-01), Bartenbach

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