US 1841917 A
Description (OCR text may contain errors)
Jan. 19, 1932. sc 1,841,917
HEADLIGHT REFLECTOR Original Filed March 21, 1929 Patented Jan. 19, 1 932 UNETED STATES PATENT OFFICE HEADLIGHT REFLECTOR Application filed March 21, 1929, Serial No. 348,700. Renewed June 10, 1931.
This invention relates particularly to a reflector for use on automobile headlights, and aims to provide an improved reflector in which the illuminating efficiency of the 5 beam will be maintained to the fullest extent,
but in which objectionable glare will be eliminated.
This object is attained by providing a parabolic reflector in which the lower half of the reflector is provided with a series of surfaces following a parabolic curve in the di rection of the axis of the beam and tilted at an angle away from the central axis of the beam.
While I have disclosed a preferred embodiment for purposes of illustration it should be understood that various changes in the structure may be made without departing from the spirit and scope of the invention as hereinafter described and claimed.
In the drawings:
Fig. 1 is a front elevation of the reflector.
Fig. 2 is a section on line 2-2, of Fig. 1.
M The reflector is of general parabolic shape and it will be clear from Fig. 1 that the upper half 11 of the reflector is in the form of a true and smooth parabola. The rays of light that cause the glare from a headlight are those reflected from the lower half of the ordinary parabolic reflector. In order to eliminate the glare in the present invention the lower half of the reflector is formed with inner portions 12 extending a substantial distance from the center (preferably about halfway, or more) to the front, and outer portions 13, extending from the ends of the inner ones to the front, or front-flange 14.
These portions form corrugations in which the sides of the corrugations meet each other in sharp angles so that such sides form a succession of dihedral angles.
The inner portions have relatively large dihedral angles; that is, the angle of their r sides is preferably more than 90; they reflect light upward to the upper, smooth surface 11, by which it is reflected forward and downward without glare eifect.
The outer portions 13 preferably have smaller dihedral angles, approximately or exactly 90, and when so proportioned they refleet light angularly forward and laterally, providing effective illumination of the side of the road, and areas adjacent the road-side signs, etc., Without necessity for use of a spot-light, and also without glare effect.
1. A headlight reflector of generally parabolic form, having its upper half smooth, and its lower half provided with inner and outer radial portions of generally parabolic contour corrugated to form arcuate series of dihedral angles, the angles of the inner portions being relatively large to reflect light generally forward and upward, and the angles of the outer portions being relatively smaller, to reflect light principally in lateral directions.
2. The structure as defined in claim 1, with the addition that the angles of the inner portions are greater than 90, and the angles of the outer portions are approximately 90.
In testimony whereof I aflix my signature.