JPH087622A - Wall surface luminaire - Google Patents

Abstract

PURPOSE:To enable highly efficient and light nonuniformity uncausal illumination without causing any problem even if a mirror reflection plate having high reflectance is used by eliminating nonuniformity of light on a wall surface being an illumination object. CONSTITUTION:A second reflecting plate part 5 is formed on an ellipse using a first intersection (b) and a second intersection (c) as a focus. A straight line is drawn so as to pass in a contact condition through the tip of a first reflecting plate part 4 and an upper side surface of a lamp 3, and an intersection at which this straight line and the ellipse cross each other above the lamp 3 is set as a third intersection (d), and the third intersection (d) is used as one end part of the second reflecting plate part 5. An intersection at which a line in the lowermost end direction of an illumination object passing through the first intersection (b) and the ellipse cross each other above the lamp 3 is set as a fourth intersection (e), and the fourth intersection (e) is used as the other end part of the second reflecting plate part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall lighting fixture having a reflection plate having a high reflectance and a specular reflection.

[0002]

2. Description of the Related Art Conventionally, there has been known a wall illuminating device which has an asymmetric reflector and reflects light in one direction. A conventional example of this type is, for example, Japanese Utility Model Laid-Open No. 61-63714. The one disclosed in Japanese Utility Model Laid-Open No. 61-63714 is as shown in FIG. Here, the reflector 2 of FIG.
The part indicated by a in 0 is a parabola centered on the lamp 3 inclined with respect to the irradiation direction. In the conventional example as described above, the optical path B may not hit the lamp 3 when viewed from the wall surface direction as indicated by the dashed arrow in FIG.
As described above, there is an angle at which the optical path B does not hit the lamp 3, that is, the lamp 3 is not reflected on the reflection plate 20, which causes uneven light. In order to prevent this, it is necessary to make the light unevenness thin by using a reflector with a low reflectance, and there is a problem that the instrument efficiency is poor, and there is a problem that the instrument shape becomes very large. .

Another conventional example is shown in FIG. In this case, the light path E and the light path when the distance between the Hani is seen from the wall surface direction which is the irradiation object does not hit the lamp 3. That is, since the lamp 3 is not reflected on the reflection plate 20, light unevenness appears on the wall surface. However, by setting the lamp 3 deep inside the device and at a high position, the position where the light unevenness appears is lowered and the distance between the wall surface and the device is increased. The uneven light is thinned. Still, since light unevenness appears, the specularity of the reflector 20 is lowered to deal with it. Therefore, this conventional example also has a problem that the instrument efficiency is low and the instrument height is high.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to eliminate light unevenness on a wall surface which is an illumination target,
As a result, there is no problem even if a specular reflection plate having a high reflectance is used, and it is an object of the present invention to provide a wall surface lighting fixture that can perform illumination with high efficiency and without uneven light.

[0005]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, a wall lighting fixture of the present invention is provided with an asymmetrical reflection plate 1 and emits light in one direction. In the reflecting wall lighting fixture 2, the first reflector plate portion 4 is formed on the parabola in which the parabola in contact with the surface of the lamp 3 is inclined in the irradiation direction among the parabola whose center is the lamp 3 center G. This first parabola is defined as the intersection of the vertical tangent line a contacting the surface of the irradiation object and the parabola.
Is defined as the rear end of the first reflection plate portion 4, and the intersection of the straight line passing through the first intersection b and the center G of the lamp 3 and the surface of the lamp 3 opposite to the first intersection b. The second intersection c is defined as the second intersection c, and the second intersection is formed on an ellipse whose focal point is the first intersection b and the second intersection c.
The reflector plate 5 is formed, and the tip of the first reflector plate 4 and the lamp 3 are formed.
A straight line passing through the upper surface of the above is drawn, and the intersecting point of this straight line and the above ellipse above the lamp 3 is defined as a third intersecting point d, and the third intersecting point d is defined as one end of the second reflector portion 5. , A fourth intersection e between the ellipse and the line in the lowermost direction of the illumination object passing through the first intersection b.
And the fourth intersection point e is the other end of the second reflector plate 5,
The third reflection plate portion 6 is formed between the first intersection point b and the fourth intersection point e, and is opposite to the first reflection plate portion 4 from the third intersection point d which is one end of the second reflection plate portion 5. A fourth reflector plate having a shape without a refraction part is formed on the side, and an asymmetric reflector is formed by the first reflector plate 4, the third reflector plate 6, the second reflector plate 5, and the fourth reflector plate part. It is characterized by being configured.

[0006]

According to the present invention having the above-described structure, however, the second reflection plate portion 5 is formed on the ellipse having the first intersection b and the second intersection c as the focal points, and the first reflection is performed. A straight line passing through the tip of the plate portion 4 and the upper surface of the ramp 3 is drawn, and the intersection point of this straight line and the above ellipse above the ramp 3 is defined as a third intersection point d, and the third intersection point d is defined as a second intersection point. The fourth intersection point e is defined as an intersection point above the lamp 3 between the ellipse and the line in the lowermost direction of the illumination object that passes through the first intersection point b, which is one end of the reflector plate 5. By being the other end of the second reflector portion 5, between the optical path in the lowermost direction of the illumination target passing through the first intersection b and the optical path connecting the first reflector 4 and the first intersection. All of the optical paths in are reflected by the elliptical second reflection plate portion 5 and travel toward the second intersection side, and the lamp 3
Will be hit (that is, the lamp 3 will be the second reflector portion 5).
Will be reflected in), and uneven light will not occur.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.
The wall lighting fixture 2 includes a fixture main body 10 having an opening at the bottom, an asymmetrical reflector 1 installed inside the fixture main body 10, and a lamp 3
It consists of and. The instrument body 10 that is open at the bottom is attached so that the lower end opening is located near the ceiling surface.

The asymmetrical reflection plate 1 has a shape as shown in FIG. 1. The asymmetrical reflection plate 1 has a first reflection plate portion 4 and a third reflection plate portion in order from one end side to the other end side. 6, the second reflector portion 5 and the fourth reflector portion 7 are divided. The first reflection plate portion 4 is formed on a parabola whose center G of the lamp 3 is a focal point, in which a parabola in contact with the surface of the lamp 3 is inclined in the irradiation direction. The tip of the first reflector plate 4 is located at a position close to one end of the lower opening of the instrument body 10. Further, when the intersection point of the above-mentioned parabola and the vertical tangent line a which is in contact with the wall surface of the lamp 3 which is the object to be irradiated is the first intersection point b, this first intersection point b
Is the rear end of the first reflector plate 4. That is, in FIG. 1, the first reflector portion 4 is a point g on the parabola which is in contact with the surface of the lamp 3 among the parabola whose focal point is the center G of the lamp 3.
To the first intersection b.

When the intersection of the straight line passing through the first intersection b and the center G of the lamp 3 and the surface of the lamp 3 opposite to the first intersection b is the second intersection c, the second reflector The portion 5 is formed on an ellipse whose focal point is the first intersection point b and the second intersection point c. Here, when the point where the straight line passing through the tip of the first reflector portion 4 and the upper surface of the lamp 3 in contact with the above ellipse intersects above the lamp 3 as the third intersection point d, the third intersection point d The intersection point d is one end of the second reflection plate portion 5. Further, the intersection point of the line L in the lowermost end direction of the illumination target passing through the first intersection point b and the ellipse above the lamp 3 is defined as a fourth point.
When the intersection point e is defined as, the fourth intersection point e is the other end of the second reflector plate 5. That is, the second reflection plate portion 5 is a portion between the third intersection point d and the fourth intersection point e, which are located on an ellipse whose focal points are the first intersection point b and the second intersection point c.

A linear third reflection plate portion 6 is formed between the first intersection point b and the fourth intersection point e, and the third reflection plate portion 6 passes through the first intersection point b. It is located on the line L in the lowermost direction of the illumination target. Further, a fourth reflection plate portion 7 having an arbitrary shape without a refraction portion is formed on the side opposite to the first reflection plate portion 4 from the third intersection point d which is one end portion of the second reflection plate portion 5.

As described above, the asymmetric reflection plate 1 divided into the first reflection plate portion 4, the third reflection plate portion 6, the second reflection plate portion 5 and the fourth reflection plate portion 7 is a mirror surface having a high reflectance. It is formed of a reflector. Since the wall lighting device 2 having the above-described structure includes the asymmetric reflector 1 as shown in FIG. 2, it reflects light in one direction. It illuminates the wall surface which is the irradiation target. In this case, the optical path M in the lowermost direction of the illumination target passing through the first intersection b and the optical path N connecting the first reflector 4 and the first intersection (that is, within the angle α in FIG. 1). Any of the optical paths that pass through) enters the second reflector portion 5 formed on an ellipse whose focal point is the first intersection point b and the second intersection point c, and is reflected toward the second intersection point c (that is, Since the bisector of the angle formed by the two lines drawn from the arbitrary point on the ellipse to the two focal points is the same as the line orthogonal to the tangent line passing through the points on the ellipse, the first intersection point b The optical path reflected by the second reflecting plate 5 on the ellipse passes through the second intersection point c). As described above, the optical path M in the lowermost direction of the illumination target passing through the first intersection b and the optical path N connecting the first reflector plate 4 and the first intersection are both the first intersection b. , When incident on the second reflection plate portion 5 formed on the ellipse having the second intersection point c as a focal point, it will hit the lamp 3 on the way to the second intersection point c (that is, the lamp 3 is the second reflection plate portion). 5), and uneven light will not occur.

The optical path when looking from point g to point b from the wall surface is H, and the lamp 3 has the first reflector plate 4
It is reflected in, so there is no light spot.

[0013]

As described above, according to the present invention, the first reflector plate portion is formed on the parabola which is in contact with the lamp surface among the parabola whose focal point is the center of the lamp and which is inclined in the irradiation direction. , The intersection of a vertical tangent line that is in contact with the surface of the lamp on the irradiation object side and the parabola is the first intersection, and this first intersection is the rear end of the first reflector plate, and the first intersection and the lamp The second intersection is defined as the intersection of the straight line passing through the center of the lamp and the first intersection of the lamp and the surface on the opposite side, and the first intersection and the second intersection.
The second reflector portion is formed on an ellipse whose focal point is the intersection point of
A straight line passing through the tip of the first reflector and the upper surface of the lamp is drawn, and the intersection of this straight line and the ellipse above the lamp is taken as the third intersection, and the third intersection is taken as the second intersection.
One end of the reflector portion, and the intersection of the lowermost end of the illumination object passing through the first intersection and the ellipse above the lamp is the fourth intersection, and the fourth intersection is the second reflector portion. A third reflection plate portion between the first intersection point and the fourth intersection point, and is opposite to the first reflection plate portion from the third intersection point which is one end portion of the second reflection plate portion. A fourth reflector plate having a shape without a refraction part is formed on the side, and the first reflector plate, the third reflector plate, the second reflector plate part, and the fourth reflector plate part constitute an asymmetric reflector plate. Therefore, the optical path in the lowermost direction of the illumination target that passes through the first intersection and the optical path that connects the first reflection plate portion and the first intersection are both formed into the elliptical second reflection plate portion. It will hit the lamp on the way to the second intersection side after being reflected (that is, the lamp will be reflected on the second reflector plate),
Since the light unevenness does not occur and the light unevenness does not occur in this manner, a specular reflector having a high reflectance can be used, and a highly efficient wall lighting fixture can be provided. The width of the device can be shortened as compared with the conventional example shown in FIG. 3, and the vertical length of the device can be shortened as compared with the conventional example shown in FIG. 3, and as a result, the device can be downsized.

[Brief description of drawings]

1 is a cross-sectional view of the present invention.

FIG. 2 is a sectional view of a conventional example.

FIG. 3 is a cross-sectional view of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Asymmetrical reflection plate 2 Wall lighting fixture 3 Lamp 4 1st reflection plate part 5 2nd reflection plate part 6 3rd reflection plate part 7 4th reflection plate part a tangent line b 1st intersection point c 2nd intersection point d 4th 3rd intersection e 4th intersection G Center

Claims (1)

[Claims] 1. A wall lighting fixture having an asymmetric reflection plate for reflecting light in one direction, wherein a parabola in contact with the lamp surface among the parabola whose focal point is the center of the lamp is tilted in the irradiation direction. A first reflecting plate portion is formed, and an intersection point of a vertical tangent line contacting the surface of the lamp on the irradiation object side and the parabola is defined as a first intersection point, and the first intersection point is defined as a rear end portion of the first reflecting plate section. , The intersection of a straight line passing through the first intersection and the center of the lamp and the surface of the lamp opposite to the first intersection is the second intersection, and the first intersection and the second intersection are the focal points. The second reflecting plate portion is formed on the ellipse, and a straight line passing through the tip of the first reflecting plate portion and the upper surface of the lamp is drawn, and the intersection of this straight line and the ellipse above the lamp is set to the third point. As the intersection, the third intersection is used as one end of the second reflection plate portion, and the first intersection is A fourth intersection is defined as an intersection of the above-mentioned ellipse and a line in the lowermost end direction of the passing illumination object, and the fourth intersection is defined as the other end of the second reflection plate portion. A third reflecting plate portion is formed between the first reflecting plate portion and the third reflecting plate portion on the opposite side to the first reflecting plate portion from the third intersecting point which is one end of the second reflecting plate portion. And a non-symmetrical reflector is formed by the first reflector portion, the third reflector portion, the second reflector portion, and the fourth reflector portion.