JP4277579B2 - Reflector and lighting fixture - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shade-shaped reflecting plate that covers a lamp and has a substantially circular cut surface perpendicular to the axis of the lamp, and a lighting fixture including the reflecting plate.
[0002]
[Prior art]
An example of this type of reflector is disclosed in Japanese Patent Laid-Open No. 5-034511. FIG. 5 is a view of the reflector disclosed therein, FIG. 5 (a) is a cross-sectional view, FIG. 5 (b) is a bottom view showing a part thereof, and FIG. 6 is a light distribution pattern of the reflector. FIG. This is a shade-shaped reflecting plate 1 that covers the lamp and has a substantially circular cut surface perpendicular to the axis of the lamp, and is substantially parallel to a certain direction over a substantially entire area of the reflecting surface 20 formed on the inner surface of the reflecting plate 1. In addition to forming a large number of the protruding reflective small band portions 30, the reflecting surface of the protruding reflective small band portion 30 protrudes in a circular arc shape in the direction perpendicular to the length direction of the protruding reflective small band portion 30. It is formed on the curved arcuate surface 40 that bends.
[0003]
The reflection plate 1 configured as described above has a light distribution pattern P having a protruding shape as shown in FIG. 6 due to reflection by the curved arc surface 40 of a plurality of protruding reflecting strips 30 that are substantially parallel. An elliptical light distribution having a long axis of the ellipse in a direction substantially orthogonal to the length direction of the reflection band 30 can be obtained. Furthermore, since this reflecting plate does not obtain an elliptical light distribution by applying paint or the like to a part of the reflecting plate, the reflecting efficiency can be improved.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-034511
[Problems to be solved by the invention]
However, although the above-described reflector 1 is useful for obtaining an elliptical light distribution, it cannot obtain a triangular light distribution.
[0006]
The present invention has been made in view of the above-mentioned reasons. The object of the present invention is to provide a shade-shaped reflecting plate that covers a lamp and has a substantially circular cut surface perpendicular to the axis of the lamp, and has a triangular shape. It is an object of the present invention to provide a reflector that can obtain a round light distribution, and a lighting fixture including the reflector.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a reflective plate according to a first aspect of the present invention, wherein the reflective plate covers the lamp and has a substantially circular cross section perpendicular to the axis of the lamp. The surface is formed continuously from the opening side to the top side of the reflecting plate, and the cross-sectional shape of the band-like reflecting surface is a curved surface that curves inward to the reflecting plate in a substantially arc shape, and the curvature of the curved surface is taken as an axis. The curvature of the curved surface is increased as the distance between the three-divided plane that divides the reflector plate into three in the axial direction and the band-shaped reflective surface intersects and a predetermined rotation angle is separated from the position where the three-divided plane and the band-shaped reflective surface intersect. Characterized by being made smaller.
[0008]
According to a second aspect of the present invention, there is provided a reflector according to the first aspect, wherein the curvature of the curved surface is maximized at a location where the two-divided plane and the strip-shaped reflective surface intersect, and the three-divided plane and the strip-shaped reflective surface intersect. It is characterized by being minimized at a location approximately 60 ° apart.
[0009]
According to a third aspect of the present invention, there is provided a reflector according to the first aspect, wherein the strip-shaped reflection surface is provided at least at a position approximately 40 ° away from a position where the three-divided plane and the strip-shaped reflection surface intersect. .
[0010]
According to a fourth aspect of the present invention, there is provided a lighting fixture comprising the reflector according to any one of the first to third aspects.
[0011]
According to a fifth aspect of the present invention, there is provided a lighting fixture including the reflector according to any one of the first to third aspects, wherein a lamp having a filament serving as a light emitting portion is arranged at a high middle position of the reflector.
[0012]
The reflector according to a sixth aspect of the present invention is characterized in that, in the first to third aspects of the invention, the curvature of the curved surface is reduced as the band-like reflective surface is located on the top side of the reflective plate.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing a lighting fixture, FIG. 1 (a) is a front view with a part cut away, and FIG. 1 (b) is a bottom view. 2 is a view showing the reflector, and is a cross-sectional view taken along the line 0-X1 in FIG. 1B (a cross-sectional view cut along a three-divided plane). FIG. 3 is a view showing the reflector and is a cross-sectional view taken along the line 0-Y1 in FIG. Sectional drawing and FIG. 4 are diagrams showing the light distribution in this.
[0014]
This luminaire includes a lamp 2 and a shade-shaped reflecting plate 1 that covers the lamp 2 and that has a substantially circular cut surface perpendicular to the axis ZZ ′ of the lamp 2.
[0015]
The reflecting plate 1 has an opening 1J on the lower side and a top 1K on the upper side, and a band-shaped reflecting surface 1a extending around the axis of the reflecting plate is formed on the inner surface of the reflecting plate 1. And this strip | belt-shaped reflective surface 1a is formed continuously from the opening part 1J side of a reflecting plate to the top 1K side. Furthermore, the cross-sectional shape orthogonal to the circumferential direction of the belt-like reflecting surface 1a is a curved surface 1aa that curves in a direction in which the lamp is arranged in a substantially arc shape, and the curvature of this curved surface 1aa passes through the central axis ZZ ′ of the reflecting plate The reflection plate is approximately maximized at a point where the three-divided planes 0-X1, 0-X2, 0-X3 and the strip-shaped reflecting surface 1a that vertically divide into three along the central axis intersect the strip-shaped reflecting surface 1a. The curvature of the curved surface 1aa is reduced as the rotation angle moves away from a location where 0-X2, 0-X3 and the belt-like reflecting surface 1a intersect. Here, the curvature of the curved surface 1aa is such that the smaller the radius of the arc, the larger the curvature, and the larger the radius of the arc, the smaller the curvature. Further, each curved surface 1aa is formed to be substantially plane-symmetric with respect to the three divided planes 0-X1, 0-X2, 0-X3.
[0016]
More specifically, the band-like reflecting surface 1a is formed from the position where the three-divided planes 0-X1, 0-X2, 0-X3 and the band-like reflecting surface 1a intersect to the place where the rotation angle is 40 °, and the rotation angle is 40 ° to 60 °. In the range of °, as shown in FIG. 3, a smooth reflecting surface 1b in which the band-like reflecting surface 1a is not formed is formed. Furthermore, as shown in FIG. 2, the band-like reflecting surface 1a is located closer to the top 1K, and the curvature of the curved surface 1aa is reduced. Specifically, if the radius of the arc of the curved surface 1aa that curves in the direction in which the lamp is arranged in an arc shape is R, the radius R1 for drawing the curved surface 1aa located on the top 1K side, and the opening 1J The relationship with the radius R2 for drawing the curved surface 1aa located on the side is R1> R2.
[0017]
The lamp 2 is a light bulb type lamp 2 in which a filament serves as a light emitting portion, and is arranged coaxially with the reflecting plate 1 in the middle of the reflecting plate 1.
[0018]
When the lighting fixture configured in this way is turned on, the light emitted from the lamp 2 is diffused by the strip-shaped reflecting surface 1a, and the light that is not diffused by the smooth reflecting surface 1b without the strip-shaped reflecting surface 1a. And two lights. And when light is diffused by the strip-shaped reflecting surface 1a, the light reaches far. In particular, the larger the curvature of the curved surface 1aa formed on the belt-like reflecting surface 1a, the farther the light reflected by this surface reaches. Here, the curvature of the curved surface 1aa is approximately maximized at the point where the three-divided planes 0-X1, 0-X2, 0-X3 and the strip-shaped reflecting surface 1a intersect, and the three-divided planes 0-X1, 0-X2, 0 The curvature of the curved surface 1aa decreases as the distance from the intersection of -X3 and the strip-shaped reflecting surface 1a increases by a predetermined rotation angle, and each curved surface 1aa is divided into three divided planes 0-X1, 0-X2, 0-X3. The light is emitted from the lamp 2 and diffused by the band-like reflecting surface 1a, and the light is divided into three divided planes 0-X1, 0-X2, 0-X3 and the band-like reflecting surface as shown in FIG. The light forms a triangular corner in the direction where 1a intersects.
[0019]
On the other hand, the light reflected by the smooth reflecting surface 1b only reaches the same range as the light of a normal circular reflecting plate, and therefore becomes light that forms a triangular side. The light combined by the two reflecting surfaces 1a and 1b is a triangle as shown in FIG. 4 and is emitted from the reflecting plate 1 as a light distribution as shown by B having rounded corners. It becomes. (FIG. 4 is a diagram in which the portions having a certain illuminance among the illuminances of the irradiated surface when the surface which is the lighting fixture is irradiated are connected by a line.)
In FIG. 4, B represents the light distribution of the reflector 1 when no strip-like reflecting surface 1a or curved surface 1aa is provided.
[0020]
At this time, the lamp 2 having a transparent glass tube and a smaller filament size has a light emitted from the lamp 2 closer to a point light source, so that the light distribution design is easier to perform. . Further, since the position of the lamp 2 is arranged coaxially with the reflector 1 in the middle of the reflector 1, the light distribution is more easily spread and the reflection efficiency is good.
[0021]
Further, in this embodiment, the band-like reflecting surface 1a is not formed in the range of the rotation angle of 40 ° to 60 °, but this portion is shown in FIG. And approximately the same light distribution can be obtained.
[0022]
According to this embodiment, a strip-like reflecting surface 1a which is the inner surface of the reflecting plate 1 and extends in a strip shape around the axis of the reflecting plate 1 is formed continuously from the opening side to the top side of the reflecting plate. The cross-sectional shape of the surface 1a is a curved surface 1aa that is curved in a substantially arc shape in the direction in which the lamp is disposed, and the curvature of the curved surface 1aa passes through the central axis of the reflecting plate, and the reflecting plate 1 extends vertically along the central axis. The three-divided planes 0-X1, 0-X2, 0-X3 and the strip-shaped reflecting surface 1a are divided into three parts, and the three-divided planes 0-X1, 0-X2, 0-X3 and the strip-shaped reflecting surface 1a are enlarged. By reducing the curvature of the curved surface 1aa as the predetermined rotation angle moves away from the location where the two intersect, the light from the lamp 2 is diffused and reaches far away at the location where the curvature of the curved surface 1aa of the strip-shaped reflecting surface 1a is large. , Where the curvature of the curved surface 1aa is small Is to become a range where light can reach by conventional circular reflecting plate, these composite light is a triangle be of a light distribution rounded at its corners.
[0023]
In addition, the curvature of the curved surface 1aa is maximized at a location where the curved surface 1aa intersects the three-divided planes 0-X1, 0-X2, 0-X3, and the three-divided planes 0-X1, 0-X2, 0-X3 and the strip-shaped reflecting surface 1a are provided. By minimizing at a location 60 ° away from the intersecting location and providing the individual curved surfaces 1aa symmetrically with respect to the three-divided planes 0-X1, 0-X2, 0-X3, The light distribution is an equilateral triangle arrangement in which 0-X1, 0-X2, and 0-X3 are the corners of the triangle, and a point that is 60 ° away from 0-X1, 0-X2, and 0-X3 is the side of the triangle. It becomes light. Furthermore, the triangular light distribution is a rounded corner of the triangle, and can be a light distribution that is line symmetric with respect to the point where the three-divided planes 0-X1, 0-X2, 0-X3 and the belt-like reflecting surface 1a intersect. .
[0024]
Further, since the strip-shaped reflecting surface 1a is provided at least at the three-divided planes 0-X1, 0-X2, 0-X3 and the portion where the strip-shaped reflecting surface 1a intersects at a rotation angle of 40 °, the strip-shaped reflecting surface 1a is rotated from this portion. Up to an angle of 60 °, the light distribution can be triangular with rounded corners without providing the strip-like reflecting surface 1a. In addition, when the strip | belt-shaped reflective surface 1a is provided to the location which is separated from the location where the strip | belt-shaped reflective surface 1a cross | intersects the 3 division | segmentation planes 0-X1, 0-X2, 0-X3 and the strip | belt-shaped reflective surface 1a, rotation angle 60 from this location. Up to °, the light distribution can be square and the corners are rounded without providing the belt-like reflecting surface 1a. The same applies to the case where the angle at which the band-shaped reflecting surface 1a is provided is changed from 50 ° to 55 °.
[0025]
Further, by arranging the lamp 2 whose filament serves as the light emitting portion in the middle of the higher position of the reflector 1, the light distribution is more easily spread and the reflection efficiency is improved.
[0026]
Further, the band-like reflecting surface 1a formed on the inner surface of the reflecting surface reduces the curvature of the curved surface 1aa as it is located on the top 1K side of the reflecting plate 1, and the lamp 2 whose filament is the light emitting portion By arranging in the middle of one, the light distribution can be more triangular and rounded at the corners.
[0027]
In this embodiment, the three-divided planes 0-X1, 0-X2, and 0-X3 are equally divided into three at an angle of 120 °. For example, the three angles are 100 °, 100 °, and 160 °. The light distribution may be an isosceles triangle.
[0028]
【The invention's effect】
In the first aspect of the present invention, light from the lamp is diffused and reaches far away at a portion where the curvature of the curved surface of the belt-like reflecting surface is large, and normal circular reflection is obtained at a portion where the curvature of the curved surface is small. Since the light is within the range that can be reached by the plate, the combined light can be of a triangular shape with rounded corners.
[0029]
In the invention according to the second aspect, in addition to the effect described in the first aspect, the light distribution by the reflecting plate can be an equilateral triangle with rounded corners.
[0030]
In invention of Claim 3, in addition to having the effect described in Claim 1, from the point where the rotation angle is 40 ° away from the point where the three-part plane and the belt-like reflection surface intersect, the rotation angle is 60 °, Even if the band-like reflecting surface 1a is not provided, the light distribution can be triangular with rounded corners.
[0031]
In invention of Claim 4, there exists the same effect as what was described in Claims 1 thru | or 3.
[0032]
According to the invention described in claim 5, in addition to the effects described in claims 1 to 3, the light distribution is more easily spread and the reflection efficiency is improved.
[0033]
In the invention according to claim 6, in addition to the effects described in claims 1 to 3, the light distribution can be made more triangular.
[Brief description of the drawings]
1A and 1B are diagrams showing a lighting apparatus according to an embodiment of the present invention, in which FIG. 1A is a front view with a part cut away, and FIG. 1B is a bottom view;
FIG. 2 is a view showing a reflector plate of the luminaire described above, and is a cross-sectional view taken along the line XX ′ in FIG.
FIG. 3 is a view showing a reflector plate of the same lighting fixture, and is a YY ′ cross-sectional view in FIG.
FIG. 4 is a view showing a light distribution of the lighting fixture same as above.
5A and 5B are diagrams showing a reflector of a lighting fixture according to a conventional example, in which FIG. 5A is a cross-sectional view, and FIG. 5B is a bottom view showing a part thereof.
FIG. 6 is a view showing the light distribution of the reflector of the illuminator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reflector 1a Strip | belt-shaped reflective surface 1b Smooth reflective surface 1J Aperture 1K Top part 1aa Curved surface 2 Lamp 0-X1 3 division | segmentation plane 0-X2 3 division | segmentation plane 0-X3 Axis of 3 division | segmentation plane ZZ 'lamp

Claims (6)

In the shade-shaped reflecting plate that covers the lamp and has a substantially circular cut surface perpendicular to the axis of the lamp, the strip-shaped reflecting surface that extends around the axis of the reflecting plate is formed on the inner surface of the reflecting plate from the opening side of the reflecting plate. The cross-sectional shape of the belt-like reflecting surface is curved in the direction in which the lamp is arranged in a substantially arc shape, and the curvature of the curved surface passes through the central axis of the reflecting plate, Is increased at a portion where the three-divided plane that is vertically divided into three along the central axis intersects with the band-shaped reflecting surface, and the curvature of the curved surface increases as the predetermined rotation angle is separated from the portion where the three-divided plane intersects with the band-shaped reflecting surface. A reflector characterized by reducing the size. The curvature of the curved surface is maximized at a location where the three-divided plane and the strip-shaped reflecting surface intersect, and is minimized at a location approximately 60 ° away from a location where the three-divided plane and the strip-shaped reflecting surface intersect. Item 1. The reflector according to Item 1. 2. The reflector according to claim 1, wherein the strip-like reflection surface is provided at least up to a location approximately 40 ° away from a location where the three-part flat surface and the strip-like reflection surface intersect. A lighting fixture comprising the reflector according to claim 1. 4. A lighting apparatus comprising the reflector according to claim 1 and a lamp having a filament serving as a light-emitting portion arranged in a high middle position of the reflector. 4. The reflector according to claim 1, wherein a curvature of the curved surface is reduced as the band-like reflective surface is located closer to the top of the reflector. 5.

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