Illumination – Vehicle steering mechanism or element moves pivoted lamp or... – Tie rod element controlled
Patent
1987-06-23
1989-04-25
Lazarus, Ira S.
Illumination
Vehicle steering mechanism or element moves pivoted lamp or...
Tie rod element controlled
362348, 362346, 362307, 362308, K21V 700
Patent
active
048253430
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a projector type headlamp for vehicles in which a predetermined beam formation is reflected by an reflector through a shutter or shade and further projected by using a convex lens.
BACKGROUND OF THE ART
It has been necessary for the headlamp for vehicles, particularly automobiles to have a distribution pattern such that the lane of travel is brightly illuminated without dazzling drivers of the automobiles running in the opposite lane. There has been proposed a so-called projector type headlamp as a headlamp having the distribution pattern satisfying such requirement mentioned above, a simple lens arrangement, and a compact size. For example, U.S. Pat. No. 4,511,955 discloses the headlamp of such type in which the reflecting surface of the reflector is formed in a revolutional ellipse and the luminosity distribution of a pattern is dependent on the formation of the reflector even though a particular distribution pattern can be obtained. Namely, it is possible to change the luminosity distribution of the distribution pattern in a constant range by changing the eccentricity of the ellipse, however it is the luminosity distribution inherent in an ellipse and it has a constant similarity. Therefore, the luminosity distribution of the distribution pattern is generally decided by the formation (a revolutional ellipse surface, a revolutional parabolic surface) of the reflector's surface, so that there is no sufficient freedom in design for obtaining a desired luminosity distribution. The object of the present invention is to present a novel headlamp of the projector type in which the above-mentioned drawbacks of the conventional headlamp of the projector type is eliminated.
The other object of the present invention is to present a headlamp in which the reflecting surface of the reflector is composed of a great many minute face elements connected with each other continuously and smoothly, the orientation of each face element is different from each other so as to obtain a desired luminosity distribution, and it is setable voluntarily to a distribution pattern having a desired luminosity distribution.
Still the other object of the present invention is to present a projector type headlamp in which the orientation of each face element is decided such that the maximum luminosity region in the distribution pattern is substantially not affected with any influence by a shade for providing a light-dark boundary.
DISCLOSURE OF THE INVENTION
The reflecting surface of the reflector of the projector type headlamp of the present invention is not the surface decided by a geometrical surface such as a revolutional ellipse surface and a revolutional parabolic surface, but is composed of a great many minute face elements connected with each other continuously and smoothly, the orientation of each face element is previously decided such that the light incident from a light source is reflected toward the vicinity of the meridional image plane of the lens and a predetermined luminosity distribution can be obtained at the position of the shade. By this the distribution pattern having a desired luminosity distribution can be obtained voluntarily.
The orientation of the face element with respect to an optical axis can be decided such that the light incident from the light source is reflected to the vicinity of the meridional image plane of the convex lens and the distance between the optical axis and the point at which the reflected light from each face element is reached on the meridional image plane, can be obtained as a function of a distance between each face element and the plane substantially perpendicular to the meridional image plane and including the optical axis. By selecting the function suitably, it is possible to increase the luminous intensity of the central portion, and to increase the solid angle, and further to increase the meridional luminous intensity, thereby effectively utilizing the reflected light.
Furthermore, it is also possible to decide the orientation of e
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patent: 3930149 (1975-12-01), French
patent: 4511955 (1985-04-01), Ernst et al.
patent: 4517630 (1985-05-01), Dieffenbach et al.
patent: 4562519 (1985-12-01), Deres
patent: 4669032 (1987-05-01), Lietar et al.
patent: 4686610 (1987-08-01), Cibie et al.
patent: 4771372 (1988-09-01), Litetar et al.
patent: 4772987 (1988-09-01), Kretschner et al.
patent: 4779179 (1988-10-01), Ogama et al.
Cox D. M.
Ichikoh Industries Limited
Lazarus Ira S.
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