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Патент USA US3088029

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April 30, 1963
Filed Dec. 6, 1960
United States Patent G ’ ice
Patented Apr. 30, 1963
It should be added that the deviated rays are not lost
Giuseppe Ayroldi, Via Tirso 101, Rome, Italy
Filed Dec. 6, 1960, Ser. No. 74,189
Claims priority, application Italy Dec. 7, 1959
2 Claims. (Cl. 240-411)
but directed by the ba?ie itself into the remaining light
beam, thereby improving road illumination.
FIG. 2 illustrates another way of eliminating the dis
turbance caused by the light beam which comprises vary
ing appropriately the shape of the lower part of the
ellipsoidal surface on which the rays would be re?ected
into the eyes of someone looking into it. In this case, too,
This invention relates to improvements in headlights
a proper contrivance would be employed to direct the
for motor vehicles.
Headlights, as they are presently installed in motor 10 deviated rays into the remaining light beam.
I claim:
vehicles, have the serious shortcoming of either dazzling
1. An illuminating device comprising a wall, said wall
anyone facing the vehicle or illuminating insufficiently
having a generally ellipsoidal light re?ecting inner sur
face including ?rst and second spaced focal points on
ance to the eyes of a person facing the light is not com 15 the major axis of the generally ellipsoidal inner surface,
said ellipsoidal inner surface being truncated normal to
pletely avoided.
major axis thereof to include within the illuminating
The hereindescr-ibed headlight has been contrived ex
device said ?rst and second focal points of the light re
pressly to avoid the above defects.
?ecting surface, a source of light positioned on the ma
The invention will be more particularly described with
20 jor axis at the ?rst focal point of the ellipsoidal surface
reference to the drawings wherein:
remote from the truncated end, a ?rst light impervious
FIG. 1 is a diagrammatic vertical sectional view of
the road, when in the antidazzling position. Even when
the headlights are in the anti-dazzling position, disturb
a headlight embodying the principles of the invention;
planar ba?le, said light impervious planar ba?le posi
tioned with its plane surfaces parallel to the minor axis
FIG. 2 is a perspective view in partial section of a 25 of the ellipsoidal inner surface and at the second focal
point, an aperture in said ?rst light impervious planar
modi?ed form of the invention.
ba?le, said aperture positioned at the second focal point
The principal structures of the headlight, as indicated
of the ellipsoidal inner surface remote from the source
for example in FIG. 1, but not necessarily limited there
of light, a second planar ba?le supported by said illumi
to, are: 1 an ellipsoid-shape re?ector, 2 a diaphragm, 3
nating device, a planar light re?ecting surface on said
a glass or lens, 4- a baflle, and 5 a source of light.
30 second planar ba?le, said light re?ecting surface of the
It is known that an ellipsoid has two ?nite focal points.
second baffle being positioned above the major axis of
Therefore, a single or double ?lament light source 5,
the ellipsoidal inner surface of the device and extending
when placed at one of the two focal points, emanates
perpendicularly from the side of the light impervious
rays which, after having hit the inner surface of the
battle remote from the ?rst and second focal points to
ellipsoid, silver plated, as at 8 for practical reasons, re
re?ect light passing through the aperture from the lower
?ect and converge to the other focal point.
reflecting surface of the ellipsoidal inner surface and to
By placing the diaphragm 2, having an aperture '7,
direct said light into the beam of light passing through
at the height of the second focal point 6, all the ex
the aperture reflected from the upper reflecting surface of
treme blaze is maintained within the reflector including
the excessive light departing from the light bulb. The
result is that someone facing the vehicle headlights will
not be dazzled, and the above described shape of the
re?ector, cooperating with the apertured diaphragm pro
vides the light beam for illuminating the road.
In order to eliminate any disturbing effect caused by 45
the light beam passing through the aperture in the dia
phragm a portion of the rays are re?ected downwardly
the ellipsoidal inner surface.
2. The illuminating device de?ned in claim 1 includ
ing a lens positioned in the path of the light passing
through the aperture augmented by the beam of light
re?ected by the second baffle.
References Cited in the ?le of this patent
at a low angle. This is achieved by placing tangentially
above the hole 6 of the diaphragm 2 a ba?le 4 adequately
shaped and silver-plated on its lower surface. In ‘the
illustrated form of the invention the ba?ie is ?at and
trapezoidal in shape.
Wardwell __________ __ Aug. 11, 1931
Barbian ______________ __ Dec. 8, 193-1
Rivier ______________ __ Nov. 20, 1934
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