Illumination – Elongated source light unit or support – Housing
Patent
1985-05-31
1987-03-17
Nelli, Raymond A.
Illumination
Elongated source light unit or support
Housing
362341, 362346, 362297, 362 1, F21S 300
Patent
active
046512594
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a reflector device for an artificial source of light having a spectrum corresponding to that of natural light, this artificial light source preferably being a fluorescent tube with reflector bodies that are adjustable and arranged at least partially around the light source.
A corresponding reflector arrangement is described in the German Registered Article No. DE-GM 18 03 911. There the reflector device is arranged in a street lamp in order to be able to adapt the luminous intensity distribution of each individual lamp to the respective street conditions by adjusting the individual reflector bodies formed like mirrors. Thereby the individual mirrors arranged on a ring around the lamp are adjusted once after mounting of the lamp in order to be adjusted to the desired street conditions, as mentioned above.
The British Specification No. GB-PS 97 40 relates to a reflector device for artificial light being composed of individual reflectors arranged in a ring or collar around a light source, which reflectors can be pivoted in such a manner that the lamp will either throw up the light to a ceiling or down to the floor of a room.
The U.S. Pat. No. 4,074,127 describes an illumination apparatus by which the light conditions of day and night can be simulated. Thereby the light conditions signify merely the value of light intensity. The simulation is effected in that a rod-shaped lamp is surrounded by a rotating reflector being provided with a slit, which reflector in accordance with the desired daytime to be simulated will not conceal the radiation delivered by the lamp or only partially conceal it or completely conceal it.
It is the object of the present invention to develop a reflector arrangement of the kind as mentioned at the outset in such a manner that the biologic effects of artificial light sources are improved to the effect that especially the colour temperature of the light coming from the light source will correspond to the daily routine of the natural day light, consequently can be simulated to the natural circadian rhythm.
This problem is solved by the invention in that each reflector unit is a body of prismatic configuration that can rotate about its longitudinal axis and is extending along the longitudinal axis of the light source, where at least two of the side faces of the body have a geometry differing from each other with different optical properties. Here by optical property or, resp. efficiency it is understood that especially the colour temperature of the reflected light is variable in order thus to correspond to the daily routine of the natural light. At the same time by adjusting the reflector bodies with respect to each other and the optional alignment of the differently reflecting side faces of the body according to the changing of the colour temperature, it is guaranteed that the luminous intensity is effected similarly to the daylight. To this effect the individual reflector bodies can be controlled synchronously, eventually by a pre-programmed control system so that the natural course os the daylight is simulated. Thereby the monotonous illumination intensity and colour temperature of the known artificial light sources is neutralized.
Consequently a natural metabolic and hormone economy is guaranteed for the human organism even then if it has to work under corresponding artificial light source conditions. Thereby the reflector bodies can be controlledly aligned to the light source in such a manner that even the passage of clouds or the like can be simulated in that e.g. shorter time intervals of less illumination intensity are reproduced.
According to an especially preferred embodiment the prism-shaped body is a triangular prism of which the three side faces are provided with a geometry differing from each other, where the optic efficiency of same is likewise designed differently. Thus after preferred characteristics of the invention one of the side faces is of convex shape and preferably has a structured surface. This convex side face, being red or at least has
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Bierman Jordan B.
Nelli Raymond A.
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