JPS58209803A - Illumination system and illuminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting system and lighting equipment applied to tennis courts and the like.

When it is necessary to illuminate a flat area of a certain size with uniformity, for example, lighting a tennis court has traditionally been done as follows.In other words, lighting a tennis court requires a length of uniformity. Therefore, a high-output lamp (equivalent to a wide-angle floodlight Clkw, beam angle of about 80°) is used.
As shown in FIG. 15, the lights are installed at a predetermined height at four points a to d on both sides of the tennis court A, and the white line (the dotted line in the figure) of the tennis court A is illuminated as shown by the arrow. FIG. 16 shows the illuminance distribution, and each numerical value in the figure is in units of lx. However, although this illumination has a large beam angle of 80', the viewing angle of the irradiation area is 25' to 35°, so much light exits outside the irradiation area, resulting in low illumination efficiency. In other words, there was a drawback when the average illuminance within the area was low.

Conversely, in order to increase this average illuminance, a medium P4 type floodlight (lk
If you try to illuminate with a beam angle of about 40' If), the illuminance at the irradiation point will be much higher than the surrounding area due to the illuminance distribution shown in Figure 17, resulting in a bright spot K, resulting in poor symmetry. The quality of the lighting will deteriorate.

Therefore, in this case, @20
As shown in the figure, it is common to aim at the irradiation point far away (and the irradiation directions cross each other. Figure 21 shows the illuminance distribution. However, when aiming at a far distance, Figures 18 and 19 Although the illumination area B is expanded as shown in FIG. 2, there is a drawback that more light exits outside the illuminated area, and the illumination efficiency deteriorates as described above.

Therefore, an object of the present invention is to provide an illumination method and a lighting fixture that can illuminate a certain planar area efficiently (and evenly).

An embodiment of the lighting system of this invention is shown in FIGS. 1 to 7.
As shown in the figure. In other words, the tennis court 1 may have two courts as shown in Fig. 1, or three courts as shown in @2, but when these tennis courts 1 are floodlit, it may cause interference to the players. In order to radiate light at right angles to the playing direction (in the case of tennis, vertically in the direction of the tennis court) so as not to interfere with the direction of play, poles 2a to 2di are erected on the side of court 1, and floodlights 3 are placed in 2a to 2d. Set up. The dotted line in the figure exhausts the white line of Court 1. In these cases, the dimensions of court 1 are 34 m (in the left and right directions in the figure),
Vertical 37F? i1, and FjIt48m in case of 3 sides.

The length is 37ffl, the positions of poles 2a-2d are 8-10m from the court corner, and the height is 10-15ff! The projector 3 is installed at the end of the projector.

Now, in this lighting method, the Sunawachi tennis court 1 is divided into four according to the position of Bohr L/23 to 2d, and each ball 2a .about.2df, respectively, illuminate rectangular illuminated regions 4a to 4d in the vicinity thereof. The illumination uses three low-fluorescent (400 watt) medium-angle projectors 113a to 3C, and is directed at a predetermined beam angle toward three points 5a to 5C forming a triangle in area 4a (in the direction of the arrow). Project each. To explain in detail, if you try to uniformly illuminate the area 4a as shown in Figure 3 with one port IV 2a, the Bohr L/
Since the highest luminous intensity is required at Tomoike points 5a and 5b, which are farthest from 2a, these two points 5a and 5b'i are irradiated with two lamps. This state a'eFigure 4fat, lbl,
tel, ldl K shows. In the figure, the curve in area 48H is the illuminance distribution, and the curve on the center side is the highest illuminance. 1. If only these two lamps are used for illumination, the area 6 near the center of the area from the feet of Poe IV 2a becomes dark as shown in FIG. 4, 1dl. To compensate for this, another 5clC lamp is irradiated at point 5 (Fig. 4 (C)). Figure 5 shows these three floodlights 3a~
This is a light distribution diagram when the light is illuminated at 3c and t. By appropriately selecting the direction, luminous flux, and beam angle of these lights, it is possible to easily and efficiently move within the range shown by curve 6 and achieve uniformity.艮〈It can light up. In the case of tennis court 1, the angle θ is 17 in Figure 6, which shows the 2nd side, and the angle θ' is 12° in Figure 7, which shows the 3rd side, and the distribution of the three lights satisfying this condition is as follows: About 10pa1=10pJ=10pc1-12
° ~ 17'' (however, the point p is at the instrument position on the bone n'ta, the point O is the midpoint between the points a1 and bl, the point al is at the position 5a, the point b1 is at the position 5b, and the point C1 position) 1t5C%1The height of 1topo V is 13FM), the beam shape in each direction of 1tomo is 1/2 if it shifts by 106 from the center luminosity,
If it shifts by 15 degrees, it becomes V3.

(5) A medium-angle archetype light distribution with a shape in which the luminous intensity decreases to 1/10 when shifted by 20 degrees, and the luminous flux ratio in each direction a1, bl, and C1 is Fa:Fb:F0=7:7:6 to 3:3 :
It is 4.

By arranging the beams of the three lights as described above, the sixth
Point 0 in the figure and @7 figure is in the direction pa1°T)bl
, pcl, respectively, and the luminous intensity of about 1/3 of the maximum luminous intensity of the three beams reaches there. Therefore, the total light in direction po□original direction pa.

It becomes equal to the luminous intensity of pb and pc. Point a1. Regarding the midpoint d of C, the direction pd is about 10° with respect to pal and pCI Vc.

It is shifted by 20° with respect to the direction pb construction. Therefore, the luminous intensity in the direction pd is 172, which is the maximum luminous intensity of the two beams to points a1 and C1, and the influence of the beam on point b1 is #
1 I don't accept it at all. Therefore, the luminous intensity in the direction pd is also in the direction a1
It is equal to the maximum luminous intensity of the beam in °cl. For these reasons, the intensity of light irradiated into the region Δa1111 C1 becomes almost uniform. Furthermore, each beam has a medium angle light distribution,
Since the light is aimed closer to the port V than the center of the area, fewer sources go outside the area and more efficient illumination can be achieved (6).

A first embodiment of the lighting equipment of this invention is shown in FIGS.
Shown in Figure 1. That is, this lighting equipment uses one lkwO high-wattage projector g@7, and a reflector plate 8 having a shape as shown in the figure is attached to it. This reflecting plate 8 has three curved parts 10 each consisting of a paraboloid of revolution which has the entire focal point at the center of the lamp 9.
- 12, each rotation axis is inclined by 12° to 17 @ with respect to the instrument axis, and is oriented in the direction of points a1, bl, and C1 in Figs. 6 and 7, and the beam shape is The light intensity value becomes 1/2 for a deviation of 10° from the direction of the central beam, 1/3 for a deviation of 15°, and 1/1o for a deviation of 20'.

FIG. 10 shows the irradiation direction when the floodlight is installed on the balls 2a to 2d of the tennis court 1, and FIG. 11 shows the illuminance distribution at that time. Furthermore, the average illuminance and uniformity of the conventional example and the example were measured, and the results are shown in the table below.

However, 112 meta-V halide lights are used, and the maintenance rate is 0.8.
, Beau V height 137F! It is.

As is clear from the above illuminance distribution and the above table, it can be seen that the average illuminance is larger than before, the efficiency is better, and the uniformity is also better. Also the 1st O
The irradiation direction in the figure is almost the same as that in FIG. 15. Therefore, whether the lights are turned on completely or in a thinned-out manner, only the illuminance level changes, and the illuminance distribution pattern hardly changes. In other words, power can be saved in a timely manner by thinning out the lighting according to the difference in illuminance level between recreation level V and official competition level. Furthermore, compared to using 13 low-wattage lamps for each lamp, the efficiency of the lamps themselves is higher and the cost of installing the equipment is much lower.

A second embodiment of the lighting fixture of this invention is shown in Figures 12 to 14. That is, on the upper side of the reflecting plate 8', there is a wave-shaped reflecting surface 13 (facet) that illuminates the vicinity of the foot of the bow ν.
is formed. This reflective surface 13 [the reflected light is @14
As shown in the figure, the rectangular area is po IL/g11, both front corners 14
．． 15 and supplements the four parts that are insufficiently illuminated by the reflector 8', thereby further increasing the uniformity.

As described above, the lighting method p and lighting equipment of the present invention are as follows:
Since three predetermined points formed in a triangular shape within a fixed plane area are irradiated at a predetermined beam angle, there is an effect that the illumination can be efficiently and uniformly illuminated. Since the light source is provided with a reflector plate to emit light in 63 forward directions at a predetermined beam angle, the device is efficient and inexpensive.

[Brief explanation of drawings]

Figures 1 and 2 are a plan view of a tennis court to which an embodiment (9) of the invention method is applied, Figure 3 is a plan view of a tennis court showing the area to be illuminated per boche, and Figure 4 is a plan view of a tennis court. An explanatory diagram explaining illumination in three directions per V, Fuku 5 is an explanatory diagram explaining the t area illuminated per Pau V, 6th m
and FIG. 7 is a plan view of a tennis court showing the direction of irradiation;
FIG. 8 is a front view of the first embodiment of the device of the present invention, FIG. Figure 12 is a front view of the second embodiment, Figure @13 is a side view thereof, Figure 14 is an explanatory diagram showing illumination state a, and Figure 15 is a tennis court that accepts the illumination direction of the conventional wide-angle method. top view of the court,
Figure 16 is the illuminance distribution diagram, Figure 17 is the illuminance distribution diagram when using the medium angle method, Figure 18 is a perspective view showing the long distance illumination state of the medium angle method, Figure 119 is its side view, and Figure 20. is a plan view showing the direction on the tennis court, and the 21st section is its illuminance distribution map. 1...Tennis court (i lighting area), 3...Floodlight, 8.8'...Reflection Plate, 9... Lamp, Al, B work, C1... Irradiation (10) Point 1 Figure 14-14- Figure 16-15- Figure 21

Claims (3)

[Claims] (1) It is characterized by irradiating three predetermined points forming a triangle in a fixed plane illumination area with a predetermined beam angle and luminous flux from the same position, and mutually cross-illuminating the edges to achieve uniform illumination. Lighting method. (2) Equipped with a light source and a reflecting plate formed by three paraboloids of rotation arranged in waves by the light source, each @ rotational object surface has the center of the light source as its focal point, and the rotation of each paraboloid of revolution The axis is tilted at a predetermined angle with respect to the central axis of the light source, and each paraboloid of revolution forms a predetermined beam angle, so that the illuminance within the area illuminated by each paraboloid of revolution of this reflector is equalized. utensils. (3) The lighting fixture according to claim 2, wherein the reflector has a partial reflection surface that illuminates the area immediately below the light source.