Illumination – Vehicle steering mechanism or element moves pivoted lamp or... – Tie rod element controlled
Patent
1990-08-31
1992-07-14
Lazarus, Ira S.
Illumination
Vehicle steering mechanism or element moves pivoted lamp or...
Tie rod element controlled
362 80, 362297, 362346, 362349, B60Q 100
Patent
active
051309025
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a lamp comprising a light source, a reflector having a body formed by a parabolic generatrice rotatable about the optical axis of the reflector, and a diffusing plate covering the light exit aperture of the reflector.
Lamps comprising a reflector produced by rotation of a paraboloic generatrice whose axis coincides with the optical axis of the reflector, are known. In order to provide a large solid angle for radiation of light and, thus, for a large light flux to meet the legal requirements to lighting, these lamps are designed with large diameter and mounting depth. However, for aerodynamic and styling reasons, increasingly small mounting spaces are available in motor vehicles for accommodating the lamps.
SUMMARY OF THE INVENTION
The object of the invention is a lamp that occupies less space but permits to obtain the same light flux as with larger conventional lamps. The object of the invention is achieved by providing a lamp in which the reflector is formed by rotation of the parabolic generatrice by an angle around a predetermined focal point of the reflector on the optical axis thereof, and the diffusing plate directs the light from the reflector substantially parallel to the optical axis of the reflector.
Temperature reduction in the central region of the diffusing plate is achieved, according to the invention, by forming a section of the reflector from which light is reflected into the central region, with a generatrice having a non-parabolic curve.
Additional reduction of the temperature in the central region of the diffusing plate is achieved, according to the invention, by replacing a circular surface of the non-parabolic section of the reflector with a surface having a perimeter consisting of a plurality of short sections that deviate from the circular surface and form facets extending over the non-parabolic section of the reflector.
The present invention both as to its construction so to its method of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal side view of a first embodiment of a lamp according to the present invention;
FIG. 2 shows the same view as the FIG. 1 of a second embodiment of a lamp according to the present invention;
FIGS. 3-7 show five different versions of a section of a lamp designated by Roman numeral III in FIG. 2; and
FIG. 8 shows a comparative view illustrating a light ray obtained with a lamp according to the present invention and a light ray obtained with a conventional lamp.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A lamp illustrated in FIG. 1 consists of a reflector 1, a bulb 2 arranged in the apex region of the reflector 1, and a diffusion plate 4 covering the light exit aperture of the reflector 1. The spiral-wound filament 3 of the bulb 2 is arranged in the focal point F of the reflector 1.
In a first embodiment of the lamp illustrated in FIG. 1, the reflector 1 formed by rotation of a parabolic generatrice 7, termed parabola 7 for short below, by an angle .gamma. around the focal point F of the reflector 1 forming a surface of the reflector 1 around an optical axis 6 of the reflector 1. The focal point F of the reflector 1 is at the same time focal point of the parabola 7. Since the parabola 7 is rotated around the focal point F by the angle .gamma., the light, for example of a light ray 8, does not emerge from the reflector 1 in parallel with the optical axis 6, but rather inclined at the angle .gamma.. The diffusion plate, 4 is constructed as an annular lens which directs the light ray 8 in parallel with the optical axis 6.
In a second light embodiment of the lamp illustrated in FIG. 2, the parabola 7 is replaced in a section 9 from which light is reflected into the central region 12 of the diffusion plate, 4 by segments of other curves. The section 9 represents a section of a re
REFERENCES:
patent: 1841917 (1932-01-01), Schimpff
patent: 2913570 (1959-11-01), Gough et al.
patent: 3401258 (1968-09-01), Guth
patent: 4035631 (1977-07-01), Day, Jr.
patent: 4347554 (1982-08-01), Matsushita
patent: 4494176 (1985-01-01), Sands et al.
Schmid Heinrich
Schmock Von Ohr Margret
Hagarman Sue
Lazarus Ira S.
Robert & Bosch GmbH
Striker Michael J.
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