JPH0534511A - Elliptical light distribution reflector and lighting equipment for elliptical light distribution - Google Patents

Abstract

PURPOSE:To obtain the elliptical light distribution reflector at a low cost by a circular reflector by forming many pieces of projecting line reflecting small band parts being roughly parallel to the prescribed direction on the reflecting surface of a recessed circular reflector. CONSTITUTION:In an elliptical light distribution reflector A, many pieces of projecting line reflecting small band parts 3 being roughly parallel to the prescribed direction are formed in almost the whole area of the reflecting surface 2 of a recessed circular reflector 1. The reflecting surface 3a of this projecting line reflecting small band part is formed as the projectingly curved circular arc surface 4 for curving projectingly like a circular arc a cross sectional shape in the direction being roughly orthogonal to the lengthwise direction of the projecting line reflecting small band part 3. In the center part of the elliptical light distribution reflecting plate A, a through-hole for inserting a light source O is formed. An incident light from the light source O is reflected in a wide reflection (b) between dotted lines (b), (d). Accordingly, an elliptical light distribution pattern P in which the direction being roughly orthogonal to the lengthwise direction of the projecting line reflecting small band part 3 is a major axis of an ellipse is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for elliptical light distribution and an elliptical light distribution reflecting plate. More specifically, a circular reflecting plate performs elliptical light distribution, and a circular lighting device performs elliptical light distribution. In addition, the present invention relates to a technique for easily changing the direction of elliptical light distribution and avoiding uneven illuminance due to a filament of a light source in elliptical light distribution.

[0002]

2. Description of the Related Art Conventionally, a circular reflector 1a as shown in FIG.
The light distribution pattern Pa at is circular. And, as shown in FIG. 9, in order to form the light distribution pattern Pb into a rectangular shape, four reflectors are used in combination,
The reflector 1b is expensive.

[0003]

Therefore, as shown in FIG. 10, the treatment of the reflecting surface of the shaded portion E is made different from other treatments, that is, the surface treatment other than the shaded portion E is changed or painted. However, there is a case where the reflectance is reduced and an elliptical light distribution pattern is obtained by the shaded portion E in the circular reflection pattern Pa as shown by the point Ea in FIG. 10E, but the production cost is high and the efficiency is low. There was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an elliptical light distribution reflection plate which can be obtained at a low cost with a circular reflection plate. There is to try. Another object of the present invention is to provide a lighting device which can perform elliptical light distribution with a circular lighting device. Another object of the present invention is to provide a lighting device that can easily change the direction of elliptical light distribution. Another object of the present invention is to provide a luminaire that eliminates uneven illuminance due to a light source filament.

[0005]

In the elliptical light distribution reflection plate of the present invention, a large number of ridge reflection small strips 3 which are substantially parallel to each other in a certain direction are formed in substantially the entire reflection surface 2 of the recessed circular reflection plate 1. The reflection surface 3a of the ridge reflection small band portion 3 formed in this way is
It is characterized in that it is formed as a curved arc surface 4 that is curved in a circular arc shape in a cross-sectional shape in a direction substantially orthogonal to the length direction.

In the elliptical light distribution illuminator of the present invention, a large number of projection reflection small strips 3 which are substantially parallel to each other in a certain direction are formed in substantially the entire reflection surface 2 of the concave circular reflection plate 1. The reflecting surface 3a of the ridge reflection small band portion 3 is formed as a curved arc surface 4 which bends the cross-sectional shape in a direction substantially orthogonal to the length direction of the ridge reflection small band portion 3 into an arc shape. An elliptical light distribution reflection plate A is formed, and the elliptical light distribution reflection plate A is provided.

The elliptical light distribution illuminator of the present invention is characterized in that the elliptical light distribution reflection plate A is configured to be rotatable around the center of the circle. Further, the elliptical light distribution luminaire of the present invention is a mallet for diffuse reflection along the axial direction of the elliptical light distribution reflection plate A, which is substantially orthogonal to the longitudinal direction of the ridge reflection strips 3. It is characterized in that it is formed by forming the shape portion 6.

[0008]

As described above, a large number of projection reflection strips 3 that are substantially parallel to each other in a certain direction are formed on the reflection surface 2 of the recessed circular reflection plate 1. The reflective surface 3a of
A plurality of ridge reflections that are substantially parallel to each other are formed by forming a ridge arc surface 4 that bends an arc-shaped cross-section in a direction substantially orthogonal to the longitudinal direction of the ridge reflection strip 3 By the reflection on the curved arc surface 4 of the small band portion 3, the light distribution pattern P thereof obtains an elliptical light distribution in which the major axis of the ellipse is a direction substantially orthogonal to the length direction of the protruding strip small band portion 3. Can
Such an elliptical light distribution can be obtained by drawing the circular reflector 1, for example, a spatula drawing, thereby reducing the production cost.

Further, in the ellipse light distribution illuminator of the present invention, a large number of projection reflection strips 3 which are substantially parallel to each other in a certain direction are formed in substantially the entire reflection surface 2 of the concave circular reflection plate 1. The reflecting surface 3a of the ridge reflection small band portion 3 is formed as a curved arc surface 4 which bends the cross-sectional shape in a direction substantially orthogonal to the length direction of the ridge reflection small band portion 3 into an arc shape. The elliptical light distribution reflection plate A is formed by providing the elliptical light distribution reflection plate A, so that the light distribution pattern P of the ellipse light distribution reflection plate A has a length of the ellipse in a direction substantially orthogonal to the length direction of the projected strip small strip portion 3. It is possible to obtain an elliptical light distribution on the axis, and to make an elliptical light distribution even if the lighting fixture is circular.

The elliptical light distribution illuminator according to the present invention is configured such that the elliptical light distribution reflection plate A is rotatable about the center of the circle so that the elliptical light distribution reflection plate A is rotated to provide illumination. The device allows the direction of the elliptical light distribution to be easily changed. Further, the elliptical light distribution luminaire of the present invention is a mallet for diffuse reflection along the axial direction of the elliptical light distribution reflection plate A, which is substantially orthogonal to the longitudinal direction of the ridge reflection strips 3. By forming the shape-shaped portion 6, diffused reflection is performed in the mallet-shaped portion 6, eliminating uneven illuminance due to a high-voltage specification light source filament generated in the major axis direction of the elliptical light distribution, and achieving good elliptical light distribution. It can be done.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. Elliptical light distribution reflector A for reflecting incident light from the light source O
Is formed with a large number of projection reflection strips 3 substantially parallel to a certain direction over substantially the entire area of the reflection surface 2 of the recessed circular reflection plate 1, and the reflection surfaces 3a of the projection reflection strips 3 are formed. However, it is formed as a curved arc surface 4 that is curved in a circular arc shape in a cross-sectional shape in a direction substantially orthogonal to the length direction of the protruding strip small strip portion 3. A through hole 5 for inserting the light source O is formed in the center of the elliptical light distribution reflection plate A.

As shown in FIG. 1, due to the curved arc surface 4 of the protruding strip small band portion 3, the incident light from the light source O is indicated by a dotted arrow a,
The reflection area b between B is wide. That is, the reflected light, which does not form the ridge reflection small strip portion 3, is reflected as indicated by solid arrows B and B, and the reflection area a is narrow. However, when the ridge reflection small strip portion 3 is formed, as described above, The reflection is performed in the extremely wide reflection area b. That is, as shown in FIG. 1C, the dotted line portion is the basic light distribution pattern Pa, and the portion indicated by an ellipse is the elliptical light distribution pattern P.

As shown in FIG. 2, the convex arcuate surface 4 of the protruding strip small band portion 3 has a maximum reflection angle at both ends thereof, and α,
By comparing β, the larger angle determines the size of the shape of the light distribution pattern P in the spreading direction. That is, by determining the angles at both ends, the shape of the curved arc surface 4 is set. Similarly, the shapes of all the other curved arcuate surfaces 4 are also set, and α or β of them has the same value. When the light distribution pattern P is set to obtain the shapes of all the curved arc surfaces 4,
Of course, the value will be different, but the curved arc surface 4
If the maximum value of the shape of is applied to all, it will fall within the obtained light distribution pattern P, and elliptical light distribution can be realized.

FIG. 3 shows an embodiment of the present invention, in which the ridge reflection strip 3 is formed.
Has a width c of about 3 mm and a radius of curvature R of 11.5 mm. In FIG. 3, d is 88 mm, e is 95 mm, f is 5.235 mm, and g is 23.460 mm. With such a configuration, an elliptical light distribution pattern P as shown in FIG. 3D was obtained. In the figure, h is 1.5 m and i is 0.
It is 5m.

FIG. 4 shows an elliptical light distribution luminaire B, in which a luminaire main body 10 is attached to a mount 8 via a stay 9. In such a case, the luminaire main body 10 is attached to the stay 9. May be attached so as to swing freely, and the stay 9 may be attached to the attachment base 8 so as to be rotatable about its axis. As shown in FIG. 5, small protrusions 12 are formed on the reflector sliding contact metal fitting 11 made of an annular leaf spring at intervals of approximately 120 ° in the circumferential direction. The circular reflection plate 1 is fixed by 14 and is rotatably sandwiched between the reflection plate sliding contact metal fitting 11 and the reflection plate receiver 16 connected to the shade 13 by the connecting piece 15 to rotate the circular reflection plate 1. Only one can be rotated. In this case, the small protrusions 12 are present, so the screw 14
The reflector sliding contact metal fitting 11 fixed to the shade 13 is elastically deformed to make sliding contact at the sliding contact P as shown in FIG. The sliding contact area in the direction is reduced, and the circular reflector 1 can be lightly rotated.

FIG. 6 shows another embodiment of the circular reflecting plate 1. In this elliptical light distribution reflecting plate A, the protruding strip small strip portion 3 is formed.
A diffused perforated portion 6 is formed along an axial direction that is substantially orthogonal to the lengthwise direction. This hammer 6
In the above, diffuse reflection is performed, and uneven illuminance due to a high-voltage light source filament generated in the long axis direction of the elliptical light distribution is eliminated, and good elliptical light distribution can be performed.

That is, as shown in FIG. 7, the light source filament of the 100V type light bulb is relatively long and the light emitting area is larger than that of the low voltage type light bulb. Therefore, the image of the light source filament is formed on the elliptical light distribution reflection plate A. Is projected and uneven illuminance X occurs. The illuminance unevenness X is mainly distributed along the major axis direction of the elliptical light distribution reflection plate A, though the entire reflection surface 2 of the elliptical light distribution reflection plate A is affected.
Conversely speaking, the portion along the major axis of the elliptical light distribution reflection plate A mainly reflects light near the major axis of the irradiation surface. The shape and size of the part are specified by observing the reflection surface 2 of the elliptical light distribution reflection plate A in a state where the light bulb is turned on and the light source filament is projected as an image (high brightness part). to decide. The mallet-shaped portion 6 is formed on the specified portion so as to diffuse and reflect the light in the light distribution pattern P. And even if the elliptical light distribution reflection plate A is made of sheet metal,
It may be made of a molded product.

[0018]

The elliptical light distribution reflector of the present invention is provided with a large number of projection strips which are substantially parallel to each other in a certain direction and are formed on substantially the entire reflecting surface of the recessed circular reflector. The reflection surface of the reflection strip is substantially parallel because it is a curved arc surface that bends the cross-sectional shape in a direction substantially orthogonal to the longitudinal direction of the projection reflection strip in an arc shape. Due to the reflection on the curved arc surface of a large number of ridge reflection strips, the light distribution pattern is an elliptical light distribution with the major axis of the ellipse in a direction substantially orthogonal to the length direction of the ridge reflection strips. Such an elliptical light distribution can be obtained by drawing a circular reflecting plate, for example, a spatula drawing, which has an advantage that the manufacturing cost can be reduced.

In addition, the elliptical light distribution illuminator of the present invention is provided with a large number of projection reflection strips which are substantially parallel to each other in a predetermined direction over substantially the entire reflecting surface of the recessed circular reflection plate. The reflection surface of the strip reflection strip is a curved arc surface that bends in an arc shape in the cross-sectional shape in a direction substantially orthogonal to the length direction of the projection reflection strip. Since the elliptical light distribution reflector is formed, the light distribution pattern can obtain an elliptical light distribution in which the major axis of the ellipse is a direction substantially orthogonal to the lengthwise direction of the ridge reflection strip. Even if the luminaire is circular, there is an advantage that elliptical light distribution can be performed.

Further, in the lighting device for elliptical light distribution of the present invention, since the elliptical light distribution reflecting plate is configured to be rotatable around the center of the circle, the lighting device is kept as it is by rotating the elliptical light distribution reflecting plate. There is an advantage that the direction of elliptical light distribution can be easily changed. Further, the elliptical light distribution illuminating device of the present invention is a mallet-shaped portion for diffuse reflection along an axial direction of the elliptical light distribution reflection plate that is substantially orthogonal to the lengthwise direction of the ridge reflection strip. Therefore, diffuse reflection is performed in the mallet-shaped portion to eliminate unevenness in illuminance due to the light source filament generated in the long axis direction of the elliptical light distribution. There is an advantage that a good elliptical light distribution can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention, in which (a) shows a reflecting action of a curved arc surface of a ridge reflection small band portion of a circular reflection plate,
(B) shows the arrangement of the ridge reflection small strips, and (c) shows the light distribution pattern.

FIG. 2 is an explanatory view of a curved arc surface of the above-mentioned protruding strip small band portion.

FIG. 3 shows an embodiment of the same as above, (a) is a partially cutaway front view, (b) is an enlarged sectional view of a curved arc surface,
(C) is a bottom view of the reflecting surface of the ridge reflection small band portion, and (d) is a plan view of the light distribution pattern of the same.

FIG. 4 shows the above elliptical light distribution luminaire, (a)
(B) is a perspective view, (c) is explanatory drawing which shows the change of a light distribution pattern.

5A and 5B show a reflector sliding contact member of the above, wherein FIG. 5A is a plan view, FIG. 5B is a side view, and FIG.

FIG. 6 is a bottom view of an elliptical light distribution reflector of another embodiment of the above.

FIG. 7 is an explanatory diagram according to claim 4 of the above.

FIG. 8 is an explanatory perspective view showing an operation of a conventional example.

FIG. 9 is an explanatory perspective view showing the operation of another conventional example.

FIG. 10 shows still another conventional example, (a) is a bottom view,
(B) is a front view, (c) is a side view, (d) is a perspective view,
(E) is a plan view of a light distribution pattern.

[Explanation of symbols]

1 circular reflector 2 reflective surface 3 Ridge strips 3a Reflective surface 4 curved arc surface

Claims (4)

[Claims] 1. A large number of projection reflection strips, which are substantially parallel to each other in a certain direction, are formed on substantially the entire reflection surface of a recessed circular reflection plate, and the reflection surfaces of the projection reflection strips are projected. An elliptical light distribution reflection plate, characterized in that it is formed into a curved arc surface that is curved in a circular arc shape in a cross-sectional shape in a direction substantially orthogonal to the length direction of the strip reflection strip. 2. A large number of projection reflection strips substantially parallel to a certain direction are formed in substantially the entire reflection surface of the recessed circular reflection plate, and the reflection surfaces of the projection reflection strips are projected. The elliptical light distribution reflection plate is formed by forming an elliptical light distribution reflection plate by forming a curved arc surface that bends in a circular arc shape in a cross-sectional shape in a direction substantially orthogonal to the length direction of the strip reflection strip. A lighting device for elliptical light distribution, which is characterized by comprising: 3. The elliptical light distribution luminaire according to claim 2, wherein the elliptical light distribution reflection plate is configured to be rotatable around the center of the circle. 4. An elliptical light distribution reflection plate is provided with a hammered portion for diffuse reflection formed along an axial direction substantially orthogonal to the lengthwise direction of the ridge reflection small strip portion. The luminaire for elliptical light distribution according to claim 2.