Illumination – With polarizer
Patent
1989-04-14
1991-03-19
Husar, Stephen F.
Illumination
With polarizer
362264, 362294, 128396, F21V 914
Patent
active
050016083
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a therapeutic lamp, emitting polarized light, which comprises a housing which has a handle built integrally with the housing, a light bulb with an electrical power of at most 100 W arranged in the housing, a reflector arranged immediately behind the bulb, a light filter plate and a fan arranged in the housing behind the reflector.
A therapeutic lamp of the above defined type is known e.g. from the published international patent application No. WO 84/03049.
The biostimulating effects of polarized light are disclosed in the German patent specification No. DE-PS 32.20.218-C2 issued to M. Fenyo et al. FIG. 5 of this patent specification shows a therapeutic lamp, in which a polarizer filter is used. This filter is effective in the visible range of wavelengths only, therefore the infrared spectral components are filtered out. The lamp is capable of providing an output light bundle of parallel rays which has a circular cross section with a diameter of about 50 mm and the power consumption of the lamp is 150 W. This lamp substantially generates heat and a fan is used for cooling. All optical elements are arranged in a row one before the other. Owing to the high operational temperature of the casing a separate supporting structure is used.
It can be said that the lamp according to the above mentioned publication No. WO 84/03049 represents a more improved design. Here a Brewster-type polarizer is used which is effective also in the infrared range of wavelengths. Owing to the utilization of the infrared spectral components of the bulb a substantial reduction of the required lamp power could be attained. The use of a Brewster-type polarizer requires that the passageway of the light beams be tilted in a predetermined angle, in which the direction of the output beams close an angle of 114.degree. (the twice of Brewster's angle) with the main direction of the light source. This requirement substantially affects the form of such lamps. In the above referred type of the lamp a substantially cylindrical case was used which comprised a separate handle portion and an obliquely directed frontal portion. In the frontal portion specific filter elements and a glass plate were provided to prevent the surface of the polarizer from the dust present in the sucked-in air. The cooling of the case was designed in such a way that the casing remained substantially open which could not safely prevent the sensitive light reflecting or transmitting surfaces from getting dusty with time.
The use of a large and long cylindrical casing with a separate handle made the handling of the lamp difficult, since the supporting hand had to bear not only the weight of the device but also the torque which latter became more apparent when the treatment was wholly or in part downwardly directed.
The expected life-time of a metal halogen bulb is generally about 200 hours and an inappropriate cooling can even shorten this value.
The main object of the invention is to provide an improved therapeutic lamp emitting polarized light which can be used more comfortably, has an improved protection against dust and which has a more effective cooling.
Further objects of the invention lie in the extension of the expected life-time of the bulb and in the improvement of the biostimulating effects.
According to the invention a therapeutic lamp emitting polarized light has been provided which comprises a housing, a handle built integrally with the housing, a light bulb with an electrical power of at most 100 W arranged in the housing, a reflector arranged immediately behind the bulb, a polarizer placed in the path of the light emitted by the bulb, a light filter plate for filtering out ultraviolet spectral components from the emitted light and a fan arranged in the housing behind the reflector, and the improvement according to the invention lies in that the housing comprises three consecutively and directly attached parts which define a common interior space, the first part is the handle having a substantially tubular form with an axis, the second p
REFERENCES:
patent: 3185028 (1965-05-01), Andreoli
patent: 4546420 (1985-10-01), Wheeler et al.
Kehrli Jurg
Ulrich Armando
"Harrier" GmbH Gesellschaft fur den Vertrieb medizinischer und
Husar Stephen F.
Meller Michael N.
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