Illumination – With polarizer
Patent
1989-04-14
1991-04-23
Husar, Stephen F.
Illumination
With polarizer
362294, 362373, 362346, 128396, F21V 914
Patent
active
050104527
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a therapeutic lamp for biostimulation with polarized light, which comprises a light source with a power substantially between 30W and 300W and which is substantially a point source, a reflector with a rotational paraboloid light reflecting surface defining a focal point arranged behind the light source so that the focal point substantially coincides with the point source to reflect forward the majority of light emitted by the source in a parallel path, a polarizer arranged in said path to generate polarized output light propagating in a predetermined direction and which has a cross-section of at least 100 cm.sup.2.
The term "therapeutic" should be interpreted in broad sense which covers all applications of biostimulation for which polarized light can be used.
A therapeutic lamp of the kind defined is already known e.g. from the published European patent application 84850395.
German patent No. 32 20 218 C2 describes the general biostimulating effects of polarized light. The lamp described in the example of that patent can provide an output light bundle with parallel rays and with a circular cross-section which has a diameter of about 50 mm and the lamp power is about 150W. The lamp generates much heat which is transported away by means of a fan. All optical elements of that embodiment are arranged linearly after one-another.
In the international publication WO 84/03049 a therapeutic lamp of the kind defined is described which 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 provided by a fan and it was designed in such a way that the casing remained substantially open which could not safely prevent the sensitive light reflecting or transpassing surfaces from getting dusty with time.
The cross-section of the output light of such a therapeutic lamp can not be increased without difficulties. If the cross-section is increased, the cooling used so far gets rapidly insufficient or if the airflow of the fan is increased, then the danger of dust formation on the optical surfaces also increases. With increased light cross-section the volume and weight of the lamp can be substantially higher which makes the holding and positioning of the lamp more difficult. The operation of the lamp requires the use of a separate power supply.
The aforementioned European published patent application 84.850.395.9 describes a different kind of therapeutic lamp which is designed for providing larger light cross-sections. This lamp comprises a housing arranged in the lower part of the device which is similar to the widely used overhead projectors. The upper surface of the housing is made by a Fresnel lens. In the housing there is provided a metal halogen lamp with a higher power i.e. between about 200 to 800W and the lamp is arranged in the focal line of the Fresnel lens. A parabolic reflector surface is provided below the lamp to reflect the backwardly radiated rays towards the lens. In the housing an intensive cooling is provided by means of a fan. The device comprises a Brewster polarizer arranged as a separate unit fixed to the upper rear edge of the box-like housing and extends obliquely in upward and f
REFERENCES:
patent: 3936686 (1976-02-01), Moore
patent: 4663698 (1987-05-01), Tomlinson
patent: 4682276 (1987-07-01), Miller
Kolta Peter
Krebser Werner
Lantos Michael
Cox D. M.
Harrier GmbH Gesellschaft fur den Vertrieb medizinischer und tec
Husar Stephen F.
Meller Michael N.
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