Lighting apparatus with illuminance equalizing lens
First Claim
Patent Images
1. A lighting apparatus with an illuminance equalizaing lens, comprising:
- an illumination light source; and
a lens for illuminating a luminous vector from the light source onto an illuminated surface, an inner surface of the lens being formed as a continuous surface to receive the luminous vector from the light source in the normal direction thereof, and in order to obtain uniform illuminance on the illuminated surface, the distance r(φ
) from the light source to an outer surface of the lens being defined by the following equation;
##EQU11## φ
;
angle from a reference plane which is perpendicular to a line passing through the light source and the center of the outer surfaceφ
.sub. ;
angle from the reference plane to the periphery of the outer surfaceφ
2 ;
angle from the reference plane to the center of the outer surfaceθ
i ;
incident angle of the luminous vector to the normal of the outer surfaceθ
(φ
);
angle of refraction of the luminous vector to the reference planeθ
1 ;
angle of refraction of the luminous vector to the reference plane at φ
=φ
1θ
2 ;
angle of refraction of the luminous vector to the reference plane at φ
=φ
2n;
refractive index of the lensI(φ
);
illuminance distribution pattern from the illumination light source.
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Abstract
In a lighting apparatus which illuminates light ray from an illumination light source through a light distribution lens onto an illuminated surface, an inner surface of the light distribution lens is formed as continuous surface to receive incident ray in the perpendicular direction, and an outer surface of the lens for refracting outgoing ray is formed based on the equations which are made in consideration of the illuminance on the illuminated surface, thereby uniform illuminance is obtained on the illuminated surface.
49 Citations
19 Claims
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1. A lighting apparatus with an illuminance equalizaing lens, comprising:
- an illumination light source; and
a lens for illuminating a luminous vector from the light source onto an illuminated surface, an inner surface of the lens being formed as a continuous surface to receive the luminous vector from the light source in the normal direction thereof, and in order to obtain uniform illuminance on the illuminated surface, the distance r(φ
) from the light source to an outer surface of the lens being defined by the following equation;
##EQU11## φ
;
angle from a reference plane which is perpendicular to a line passing through the light source and the center of the outer surfaceφ
.sub. ;
angle from the reference plane to the periphery of the outer surfaceφ
2 ;
angle from the reference plane to the center of the outer surfaceθ
i ;
incident angle of the luminous vector to the normal of the outer surfaceθ
(φ
);
angle of refraction of the luminous vector to the reference planeθ
1 ;
angle of refraction of the luminous vector to the reference plane at φ
=φ
1θ
2 ;
angle of refraction of the luminous vector to the reference plane at φ
=φ
2n;
refractive index of the lensI(φ
);
illuminance distribution pattern from the illumination light source. - View Dependent Claims (2, 3, 4, 5)
- an illumination light source; and
-
6. A lighting apparatus with an illuminance equalizing lens, comprising:
- an illumination light source; and
a lens for illuminating a luminous vector from the light source onto an illuminated surface, an inner surface of the lens being formed as a continuous surface to receive the luminous vector from the light source in the normal direction thereof, and in order to obtain the uniform illuminance on the illuminated surface, the distance r(φ
) from the light source to an outer surface of the lens being defined by the following equation;
##EQU12## φ
;
angle from a reference plane which is perpendicular to a line passing through the light source and the center of the outer surfaceφ
.sub. ;
angle from the reference plane to the periphery of the outer surfaceφ
2 ;
angle from the reference plane to the center of the outer surfaceθ
i ;
incident angle of the luminous vector to the normal of the outer surfaceθ
(φ
);
angle of refraction of the luminous vector to the reference planeθ
1 ;
angle of refraction of the luminous vector to the reference plane at φ
=φ
1θ
1 ;
angle of refraction of the luminous vector to the reference plane at φ
=φ
2n;
refractive index of the lensI(φ
);
illuminance distribution pattern from the illumination light source. - View Dependent Claims (7, 8, 9, 10)
- an illumination light source; and
-
11. A lighting apparatus for illuminating a surface comprising:
- light-emitting means lying along a reference plane for emitting light rays; and
a lens disposed to receive incident light rays emitted by the light-emitting means and direct them toward a surface to be illuminated during use of the lighting apparatus, the lens having a curved inner surface facing the light-emitting means and being shaped so that the incident light rays impinge thereon in directions normal thereto, and a curved outer surface facing toward the surface to be illuminated and having a shape defined by the following relation;
##EQU13## r(φ
);
distance r from the light-emitting means to a point on the outer surface at an angle φ
from the reference planeφ
.sub. ;
angle from the reference plane to the end of the outer surfaceφ
2 ;
angle from the reference plane to the center of the outer surfaceθ
i ;
incident angle of the light ray to the normal of the outer surfaceθ
(φ
);
angle of refraction of the light ray to the reference planeθ
.sub. ;
angle of refraction of the light ray to the reference plane at φ
=φ
1θ
2 ;
angle of refraction of the light ray to the reference plane at φ
=φ
2n;
refraction index of the lensI(φ
);
illuminance distribution pattern from the light-emitting means. - View Dependent Claims (12, 13, 14)
- light-emitting means lying along a reference plane for emitting light rays; and
-
15. A lighting apparatus for illuminating a surface comprising:
- light-emitting means lying along a reference plane for emitting light rays; and
a lens disposed to receive incident light rays emitted by the light-emitting means and direct them toward a surface to be illuminated during use of the lighting apparatus, the lens having a curved inner surface facing the light-emitting means and being shaped so that the incident light rays impinge thereon in directions normal thereto, and a curved outer surface facing toward the surface to be illuminated and having a shape defined by the following relation;
##EQU14## r(φ
);
distance r from the light-emitting means to a point on the outer surface at an angle φ
from the reference planeφ
.sub. ;
angle from the reference plane to the end of the outer surfaceφ
2 ;
angle from the reference plane to the center of the outer surfaceθ
i ;
incident angle of the light ray to the normal of the outer surfaceθ
(φ
);
angle of refraction of the light ray to the reference planeθ
1 ;
angle of refraction of the light ray to the reference plane at φ
=φ
1θ
.sub. ;
angle of refraction of the light ray to the reference plane at φ
=φ
2n;
refractive index of the lensI(φ
);
illuminance distribution pattern from the light emitting means. - View Dependent Claims (16, 17, 18, 19)
- light-emitting means lying along a reference plane for emitting light rays; and
Specification
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Current AssigneeNational University Corporation Yamagata University
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Original AssigneePresident of Kyoto University
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InventorsHsieh, Kou-Chang, Suzuki, Michiya
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Primary Examiner(s)NOT, DEFINED
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Application NumberUS06/601,647Time in Patent Office867 DaysField of Search362/311, 362/335, 362/336US Class Current362/335CPC Class CodesF21V 5/04 of lens shape
