Illumination – Light source and modifier – Including reflector
Reexamination Certificate
2001-01-12
2002-08-27
Husar, Stephen (Department: 2875)
Illumination
Light source and modifier
Including reflector
C362S346000, C362S298000, C362S299000, C362S518000, C362S539000, C362S328000
Reexamination Certificate
active
06439745
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a light composition appropriate for vehicle light, and more in detail, has an object to supply a composition further enhancing performances such as light beam availability improvement for a light source of light appropriate for the illumination application such as head lamp.
2. Detailed Description of the Prior Art
Conventional composition examples of this kind of light are shown in
FIG. 8
to
FIG. 10 and
, first, the light
90
shown in
FIG. 8
comprises, as basic composition, a rotational parabolic reflector
92
provided with a light source
91
disposed at the focus position, and a lens
93
provided with a lens cut
93
a
, obtains a parallel beam reflected light with said rotational parabolic reflector
92
and obtains a distribution characteristic by conveniently diffusing this reflected light by the lens cut
93
a
of the lens
93
.
Second, the light
80
shown in
FIG. 9
comprises a combined reflection surface
82
combining a plurality of parabolic cylinders where a parabolic line having a light source
81
as focus appears on the vertical direction cross section in the mounted stage of the light
80
and a straight line appears on the horizontal direction cross section (state as illustrated), and a lens
83
made plain without providing a lens cut, and obtains the light distribution characteristic by said combined reflection surface
82
it-self.
Further, the light
70
shown in
FIG. 10
comprises a parabolic reflection surface
72
of rotational parabolic reflection surface, or combined elliptical surface, elliptical free curved surface having a light source
71
as focus, an aspheric lens
73
and a shade provided as necessary, obtains irradiation by enlarging and projecting the light source image converged to and generated at the second focus by the aspheric lens
73
, and obtains the shape of required light distribution characteristic, by shielding unnecessary parts with a shade
74
. The light
70
of the type adopting this parabolic reflection surface
72
is called “projector type”.
However, in the conventional composition mentioned above, the light
90
composition shown in
FIG. 8
requires an optically strong lens cut
93
a
, making the lens
93
thickness variation important, resulting in less see-through rate and impossibility of obtaining the exterior excellent in transparency and profoundness feeling that is actually demanded in the market.
On the other hand, in the light
80
shown in
FIG. 9
, as the lens
83
made plain without providing a lens cut, an exterior excellent in transparent feeling can certainly obtained; however, for instance, the light distribution characteristic right and left breadth is secured hardly, because the light distribution characteristic is formed by the combined reflection surface
82
placed backward and, otherwise, the light distribution characteristic formation is restricted, causing inconveniences.
Moreover, the light
70
shown in
FIG. 10
has a large depth, making difficult to install, and at the same time, the aspheric lens
73
outer diameter is limited, and when this light is adopted as headlight, it is hardly recognized by the oncoming car, because its light emitting area is small.
In addition, all of lights
70
to
90
of the conventional composition are largely used and difficult to differentiate from the others and to make their design novel and, moreover, as the light beam availability to the light source is dependent on the depth, for the lights
70
to
90
of the conventional composition, the affectivity falls when there are made thinner to meet with the market demand or others.
SUMMARY OF THE INVENTION
As a concrete means to resolve said conventional problems, the present invention provides a light, wherein the light distribution formation is executed by a first reflection surface made of one of right and left, or upper and lower halves to the optical path of the same direction as the light front direction, a light source disposed near the focus of said first reflection surface and mounted with it 's bulb central axis inclined to the first reflection surface side in respect to the light front direction, a second reflection surface made of one of right and left, or upper and lower halves opposed in the closing direction to said first reflection surface in the form of partly open bivalve across this light source and having the focus near said light source, and a third reflection surface disposed outside said first reflection surface and reflecting the light reflected from said second reflection surface to the light front direction, and a light wherein a fourth reflection surface is disposed at least in one of spaces generated above and under, or light and left of said first reflection surface and second reflection surface.
REFERENCES:
patent: 2592075 (1952-04-01), Smith
patent: 2647203 (1953-07-01), Smith
patent: 3609340 (1971-09-01), Habro
patent: 4456948 (1984-06-01), Brun
patent: 5124891 (1992-06-01), Blusseau
patent: 6019492 (2000-02-01), Ikegaya et al.
patent: 6152589 (2000-11-01), Kawaguchi et al.
patent: 6244731 (2001-06-01), Koito et al.
Husar Stephen
Lee Guiyoung
Stanley Electric Co. Ltd.
Weingarten Schurgin, Gagnebin & Lebovici LLP
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