JPH0251204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lighting device, and relates to a reflector for a device that provides low-intensity level illumination from the side of an illuminated area such as an outdoor area such as a plaza or a parking lot or an indoor swimming pool. Regarding.

[Technical background of the invention and its problems]

Conventional lighting devices of this type are disclosed in, for example, U.S. Patent No.
As described in the specification of No. 3040994, both sides of the reflector with the irradiation port opening on the bottom are substantially parallel, and the reflected light reflected from the reflector on the front side of the reflector intersects the central axis of the light source. It is not irradiated in the opposite direction, but is irradiated backward, and the ineffective irradiation range I shown in Fig. 7 is irradiated, and since both sides are approximately parallel, the light distribution is spread in both directions, and as shown in Fig. 8. The illuminance distribution becomes as shown in A, and a drop-off portion B of illuminance occurs between the devices, resulting in illumination with poor illuminance uniformity.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a lighting device that can illuminate the front with good uniformity and has a high illumination rate.

[Summary of the invention]

The present invention has a reflector shape that increases reflected light toward the front and blocks light toward the rear as much as possible, and has good illuminance uniformity.The present invention includes a light source and a reflector that includes the light source and has an irradiation port on the bottom surface. and
The reflector consists of a top reflector, a front reflector, a both side reflector, and a rear reflector that are radially continuous from the periphery of the top reflector, and the reflector has both side reflectors. The rear reflector part has a shape in which the reflected light intersects with the central axis of the light source, the front reflector part has a shape in which the reflected light does not intersect with the central axis of the light source, and the upper reflector part has a shape in which the reflected light does not intersect with the central axis of the light source. The irradiation port is located further rearward, the irradiation port is expanded forward in a range of 5° to 20° with respect to the line symmetry axis of the irradiation port, and the light source is provided on the top reflector portion. The light reflected from the rear reflector of the reflector is directed forward, the light reflected from the front reflector is also directed forward, and the light reflected from both side reflectors is directed diagonally forward. This is what I did.

[Embodiments of the invention]

The configuration of an embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a reflector, which has an irradiation port 2 opened on its lower surface, and this reflector 1 has a top reflector section 3, a front reflector section 4 that continues radially from the top reflector section 3, and both side reflector sections 5. , 6 and a rear reflector section 7.

A lamp socket 9 is attached to the socket holder 8 provided on the upper surface of the upper reflection plate portion 3 of the reflector 1, and a light source such as a high-intensity discharge lamp 10 is attached to the lamp socket 9.
is included in the reflector 1.

The front reflector 4 of the reflector 1 focuses the parabola at the position of the lamp 10 and rotates the central axis P of the parabola clockwise around the focal point to direct the reflected light from the lamp 10 to the lamp 10. It is shaped to reflect in a direction that does not intersect with the central axis O.

Further, the rear reflector section 7 aligns the focal point of the parabola with the position of the lamp 10, rotates the central axis P of the parabola clockwise around the focal point, and causes the reflected light from the lamp 10 to intersect with the central axis O of the lamp 10. It has a shape that reflects the light in different directions.

Further, the basic shapes of both side reflector parts 5 and 6 are the same as that of the rear reflector part 7, and are shaped to reflect light from the lamp 10 in a direction intersecting the central axis O of the lamp 10.

The irradiation port 2 of the reflector 1 is shaped to expand toward the front at an angle θ° in the range of 5° to 20°, preferably about 10°, with respect to the line symmetry axis L of the irradiation port 2. , the upper surface reflector portion 3 is located rearward from the center of the reflector 1.

Incidentally, the front reflector part 4 and the rear reflector part 7 of the reflector 1 have facets 11 and 12 in the radial direction.
A bulge with a trapezoidal cross section is formed into several outer bundles.

Next, the operation of this embodiment will be explained.

As shown in FIG.
The light is reflected in a direction that does not intersect with the central axis O of 0 and is irradiated to the front side from the irradiation port 2, forming an illuminance distribution pattern on the front side 4a as shown in FIG.

Further, the reflected light reflected by the rear reflector 7 is reflected in a direction intersecting the central axis O of the lamp 10 as shown in FIG. Thus, the illuminance distribution pattern at the front center 7a is formed.

Furthermore, the reflected light reflected by both side reflector parts 5 and 6 is reflected by the lamp 1 as shown in FIGS. 4 and 5.
The light is reflected in a direction intersecting the central axis O of 0 and is irradiated from the irradiation port 2 while spreading to the left and right.

In addition, the irradiation port 2 is shaped to expand forward to 10° in the range of 5° to 20° with respect to the line symmetry axis L of the irradiation port 2, as shown in FIG. The illuminance distribution pattern of the diagonally front sides 5a and 6a is formed.

Note that if this irradiation port 2 is approximately parallel to the center line L, as shown in FIG. 9, it will not be in the diagonally forward direction 5a, 6a in FIG. 6, but in the side of the near side 4a in FIG. Alternatively, light may be irradiated to an unnecessary area behind the device, resulting in not only poor illuminance uniformity but also a decrease in illumination rate.

Conversely, the irradiation port 2 is aligned with the line symmetry axis L of the irradiation port 2.
If it is expanded by more than 20 degrees, for example, 25 degrees, as shown in FIG. 10, the irradiation is not in the diagonally forward direction 5a, 6a in FIG. 6, but in the front central direction 7a in FIG. The illuminance of the area decreases, and the uniformity of illuminance decreases. Furthermore, as can be seen from FIG. 10, such a reflector 1 also has the disadvantage that it is much larger than the reflector of the embodiment of the present invention.

In this way, most of the reflected light from the reflector 1 is irradiated to the effective irradiation range shown in FIG. 7, and almost no reflected light is reflected to the rear effective irradiation range.

As shown in FIG. 8, the irradiation range C on the horizontal plane irradiated by each of the illumination devices 13 installed in parallel has a drop in illuminance in the middle of the irradiation range of each device compared to the irradiation range A of the conventional illumination device. B becomes smaller, and illuminance uniformity becomes better.

〔Effect of the invention〕

According to the present invention, the front reflector part of the reflector is shaped to reflect in a direction that does not intersect with the central axis of the light source, and the irradiation port is oriented forward within a range of 5° to 20° with respect to the line symmetry axis of the irradiation port. The side reflectors and the rear reflector are shaped to reflect in a direction that intersects the central axis of the light source, increasing the amount of reflected light toward the front, eliminating light toward the rear, and further increasing the amount of reflected light toward the front. Since light is also radiated in front, the illumination uniformity is good and the illumination rate is high, making it suitable for use as square lights.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a lighting device showing an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a side view for explaining the same, FIG. An explanatory bottom view, FIG. 6 is a light distribution diagram of the same as above, FIG. 7 is an explanatory diagram showing the vertical surface irradiation range of the same as above, FIG. 8 is an explanatory diagram of the horizontal surface irradiation range of the same as above, and FIGS. FIG. 2 is an explanatory bottom view of the lighting device that is the premise of the above. DESCRIPTION OF SYMBOLS 1... Reflector, 2... Irradiation port, 3... Top reflecting plate part, 4... Front reflecting plate part, 5, 6... Side reflecting plate part, 7... Rear reflecting plate part.

Claims (1)

[Claims] 1. A light source, and a reflector that includes the light source and has an irradiation port opened on the bottom surface, and the reflector includes a top reflector, a front reflector that continues radially from the periphery of the top reflector, and a front reflector on both sides. The reflector consists of a front reflector part and a rear reflector part, and the both side reflector parts and the rear reflector part are shaped so that the reflected light intersects with the central axis of the light source, and the front reflector part is shaped so that the reflected light intersects with the central axis of the light source. The upper reflector portion is positioned rearward from the center of the reflector so that the light does not intersect with the central axis of the light source, and the irradiation port is arranged so that the light does not intersect with the central axis of the light source.
It has a shape that expands toward the front in the range of 5° to 20°,
An illumination device characterized in that a light source is provided on the top reflecting plate section.