JPS5927043B2 - lighting equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lighting device equipped with a rotating body reflector.

For example, the reflector 1 of a high-ceiling lighting device installed on a relatively high ceiling in a gymnasium or factory to illuminate floors, work surfaces, etc. is generally made of a rotational quadratic curved surface, especially a rotational radiation source, as shown in Fig. 1. A structure formed on the object surface is adopted.

However, this type of lighting device generally uses a lamp such as a high-intensity discharge lamp with high output and high lamp brightness. If you look at the reflector from below, reflected light glare may occur and cause discomfort.

Further, even if the reflector is modified in an unnecessary manner in an attempt to reduce glare from reflected light, there is a risk that the efficiency of the device will decrease or the required light distribution will change significantly.

For example, Japanese Patent Publication No. 33-1936 discloses that by changing the area ratio between the smooth surface and the light-diffusing reflective surface by rotating a movable reflection plate, the range of the reflected light beam can be changed to condense or diffuse the light beam. What has been done is disclosed.

This type has a diffused light reflection surface formed with a hammer-like unevenness, and is suitable for cases where the diffused light does not affect the optical performance of the lamp regardless of the direction in which it is directed.

However, since this reflector has a reflective surface with a hammer-like unevenness, the reflected light is reflected in various directions, and the reflective surface on the inner surface near the opening shines, causing the reflector to be viewed from below. When viewed, reflected light glare may occur.

In addition, with this type of light, the light reflected by the uneven portions of the diffuser reflecting surface is reflected again by the uneven portions, making it impossible to control the light in the desired direction.Not only is the desired light distribution not obtained, but the light is emitted from the aperture. There is a risk that the light will be reduced and the efficiency of the fixture will be reduced, making it unsuitable for use as a reflector for reducing reflected light glare while obtaining a desired light distribution.

In addition, Japanese Patent Publication No. 51-17239 discloses that a large number of radially extending convex stripes and four stripes having a cross section consisting of circular arcs with radii R1 and R2 are formed, and the concave stripes are formed with strips. The vessel is disclosed.

This device has convex portions and concave portions formed in succession, and is suitable for reducing strong light in the optical axis direction to obtain a uniform light distribution.

However, since the convex stripes and the concave stripes are formed continuously, the direction of the reflected light changes greatly depending on the position of the reflecting surface, and is reflected in various directions as a whole.
The reflective surface on the inner surface near the opening may shine, causing reflected light glare when viewing the reflector from below.

Furthermore, as the light reflected from the convex strips approaches the adjacent concave strips, the direction of reflection increases, so the reflected light is reflected back to the concave strips, making it impossible to sufficiently control the light in the desired direction. Moreover, there is a risk that the light emitted from the opening will be reduced and the efficiency of the fixture will be lowered, and this is also inappropriate as a reflector plate that reduces reflected light glare while obtaining a desired light distribution.

Furthermore, as seen in US Pat. No. 3,401,258, a reflection plate in which longitudinal grooves are formed continuously along the circumferential direction on the inner surface of the reflection plate has also been proposed.

Also, since the vertical grooves are formed continuously around the circumference, the light reflected from the vertical grooves, especially the reflected light near the valleys, is reflected again by the adjacent vertical grooves, and the inner surface near the opening is reflected again. The reflective surface of the reflector shines, and when the reflector is viewed from below, there is a risk that not only reflected light glare will occur, but also that the light power will be reduced and the efficiency of the instrument will be reduced.

The present invention was made in consideration of the above-mentioned circumstances, and it reduces reflected light glare, moderately suppresses unnecessary spread of light distribution, and can be applied to both transparent lamps and diffused lamps. It is an object of the present invention to provide a lighting device that also improves efficiency.

The present invention includes a lamp, and a rotating body reflecting plate that encloses the lamp and has a light emitting aperture on the lower surface, and the rotating body reflecting plate is arranged in a straight line connecting the lower end of the light emitting part of the lamp and the edge of the light emitting aperture. Let Q1 be the angle between the light emitting aperture and the light emitting aperture, and let Q2 be the angle between the light emitting aperture and the straight line connecting the lower end of the envelope surrounding the light emitting part of the lamp and the edge of the light emitting aperture. The angle Q between the straight line pointing inward from the edge of the light aperture and the light emitting aperture surface is Q=-z
(Ql+Q2) A single triangular prism-shaped unit that protrudes inward along the radial direction within a range of ±5°, has symmetrical slopes on both sides along the radial direction, and has the top located inward. A plurality of protruding reflective surfaces and a plurality of flat reflective surfaces formed adjacent to the protruding reflective surfaces along the radial direction are alternately formed along the rotation axis direction.

Hereinafter, details of the present invention will be explained with reference to illustrated actual cases.

2 to 4 show the structure of a first embodiment of the present invention.

Reference numeral 10 denotes a rotating body reflecting plate, and this rotating body reflecting plate 10 is formed, for example, into a rotating quadratic curved surface and has a light projection opening 11 on the lower surface,
It is formed to expand toward the light projection aperture 11.

This reflecting plate 10 has a single protruding reflecting surface 1 in the shape of a triangular prism, which projects inward from the inner surface, has symmetrical slopes 12a, 12a on both sides along the radial direction, and has the apex positioned inward.
2 and a plurality of flat reflecting surfaces 13 formed adjacent to the protruding reflecting surfaces 12 along the radial direction are alternately formed along the rotation axis direction.

That is, by forming a plurality of single triangular prism-shaped protruding reflective surfaces 12 at intervals on the reflecting plate 10 formed into a rotational quadratic surface, the basic rotational quadratic curved surface shape is formed between these protruding reflective surfaces 12. A plurality of flat reflective surfaces 13 are formed, and protruding reflective surfaces 12 and flat reflective surfaces 13 are alternately formed adjacent to each other.

Reference numeral 15 denotes a lamp, and the lamp 15 is, for example, a high-intensity discharge lamp included in the rotating body reflecting plate 10. The lamp 15 is mounted in a socket 14 provided at the base of the reflecting plate 10, and is arranged on the rotation axis of the reflecting plate 10. ing.

Next, the range in which each protruding reflective surface 12 and planar reflective surface 13 of the reflective plate 10 are formed will be explained with reference to FIG. 4.

The angle between the straight line connecting the lower end of the light emitting part 16 of the lamp 15 and the edge of the light emitting opening 11 of the reflector 10 and the surface of the light emitting aperture 11 of the reflector 10 is defined as Ql, and the light emission of the lamp 15 is The angle between the straight line connecting the lower end of the outer envelope 17 surrounding the part 16 and the edge of the light emitting aperture 11 of the reflecting plate 10 and the surface of the light emitting aperture 11 is defined as θ2, and both angles Q1. The protruding reflective surface 1 is located within the range of the angle Q that approximately bisects Q2.
form 3.

That is, the angle Q between the straight line directed inward from the edge of the light emitting aperture 11 of the reflector 10 and the surface of the light emitting aperture 11 is the angle Q between the part of the straight line that hits the inner surface of the reflector 10 and the light emitting aperture 11. A protruding reflective surface 12 and a flat reflective surface 13 are formed in the area.

In general, for reflectors in this type of lighting equipment, reflected light glare is a problem when viewed from a vertical angle of about 60° to 80°, and there are two types of glare: direct light glare from the lamp and reflected light glare from the reflective surface. Therefore, even if only direct glare is reduced, the effect will be small.

In addition, if the lamp 15 is a high-intensity discharge lamp, the light emitting part 16
There are transparent lamps 15a in which the outer envelope 17 such as an outer bulb surrounding the lamp is transparent and only the light-emitting portion 16 shines, and the diffuser lamp 15b in which the outer envelope is conched onto the diffusion surface.

Therefore, if the protruding reflecting surface 12 and the flat reflecting surface 13 are formed over almost the entire inner surface of the reflecting plate 10, the reflected light will be dispersed by each protruding reflecting surface and the reflected light glare will be reduced;
The protruding reflective surface 12 near the base of the reflective plate 10 has a vertical angle of 30'.
Since the reflective surface cannot be seen unless viewed from the direction of ~50° because the light is blocked by the opening end, the effect of reducing reflected light glare by this portion is low.

In addition, since each protruding reflective surface 12 also controls the reflected light in the horizontal direction, it is preferable to form the protruding reflective surface near the base because the light distribution tends to spread and the processing process becomes complicated. isn't it.

Further, as shown in FIG. 5a, the transparent lamp 15a is inserted into the light emitting opening 11 from a portion corresponding to the inner surface of the straight reflector 10 that connects the lower end of the light emitting portion 16 and the edge of the opening 11 of the reflector 10.
When the protruding reflective surface 12 and the flat reflective surface 13 are formed in the range up to, that is, the range of the above-mentioned angle Q1, the effect of reducing reflected light glare can be sufficiently achieved. Similarly, the proportion of reflected light that is controlled in the horizontal direction tends to be wider than necessary, and the range in which the protruding reflective surfaces 12 and flat reflective surfaces 13 are alternately formed is also wide, resulting in poor workability and machining problems. This has the disadvantage of increasing time and cost.

Further, as shown in FIG. 5, the range from the inner surface of the reflector 10 to the light emitting aperture 11 is a straight line connecting the lower end of the outer envelope 1γ of the diffused lamp 15b and the light emitting aperture 11 of the reflector 10. That is, when the protruding reflective surface 12 and the flat reflective surface 13 are formed in the range of the angle Q2 mentioned above, the area in which the protruding reflective surface 12 and the flat reflective surface 13 are formed is small, but the transparent lamp 15a is used as the reflective plate 10. Then, the amount of reflected light dispersed by the protruding reflective surface 12 decreases, making it impossible to sufficiently reduce reflected light glare.

Then, as shown in FIG. 5, the lamp 1 is placed on the reflector 10.
The angle Q formed by the straight line connecting the lower end of the light emitting unit 16 and the lower end of the outer enclosure 17 of No.
, , By forming protruding reflective surfaces 12 and flat reflective surfaces 13 alternately in the direction of the rotational axis in the range of angle Q that substantially covers Q2, the reflective plate 10 can be used for both the transparent lamp 15a and the diffused lamp 15b. It can also be applied to lamps.

Next, the present invention will be described in the seventh embodiment regarding a lighting device for high ceilings.
This will be explained with reference to the figures.

The aperture diameter of the light projection aperture 11 is 380 mmφ, and the height is 320 m.
In a case where a 400W high-intensity discharge lamp 15 is disposed on a reflector 10 formed in
2°, and Q = 2 (Qt + Q2) =
It is 19°.

Reflected light glare is a problem mainly when viewing the reflector 10 from a vertical angle of 60° to 80°, but now
When looking at the reflector 10 from the angle direction, the protruding reflective surface 12 that can reduce reflected light glare is formed in a range of about 19°, so reflected light glare is reduced in almost all ranges. .

Also, when looking at the case where the reflector 10 is viewed from an angle direction in which direct light glare is eliminated, that is, the lamp light emitting part 16 is shielded from light, first of all, in the case of the transparent lamp 15a, the reflector 1
The vertical angle at which 0 is viewed is equal to [90° - Q1 described above], so it is approximately 64°.

In the case where the protruding reflective surface 12 and the flat reflective surface 13 are formed in the above-mentioned range of Q=19°, the transparent lamp 1
5a, the reflective surface that shines with high brightness on the base side of the protruding reflective surface 12 is 19°-1 as Q2 12°, which will be described later.
2°=7°, and reflected light glare in this 7° range poses a problem, but the area where this protruding reflective surface 12 is not formed is small compared to the area where it is.

In this case, the vertical angle is only about 10% when viewed from the 64° direction, and since the reflective surface on the base side of the protruding reflective surface 12 mainly reflects the reflected light directly below, the vertical angle Since the amount of light directed in the direction of 60° to 80° is small, it is not a problem for practical purposes.

In addition, when a diffused lamp is used, since Q2=12°, by forming the protruding reflective surface 12 within a range of about 19°, the reflective surface becomes smooth even when viewed from a vertical angle of about 78°. Since you can't see it at all, you can see that there is no reflected light glare.

The reason for limiting Q to 2 (Q1+Q2)±5° will be described below.

In the above, assuming Q=19°, 19°+5°
-24°, 19°-5°-14°.

That is, one is located between Q1=26° and Q=1g, and the other is located between 92 characters 12° and Q=19°.

Forming a protruding reflective surface in a range exceeding 24 degrees results in Q-Ql, and as mentioned above, the light distribution becomes wider than necessary, and there are also disadvantages such as poor workability and increased costs. be.

Furthermore, when viewing the reflector 10 from a vertical angle of 70 degrees using a transparent lamp 15b on the reflector 10, which has a protruding reflective surface formed at an angle of less than 14 degrees, Q km 2 x 12 degrees, the protruding reflective surface It was confirmed through experiments that the area in which 12 was formed was small and reflected light glare could not be sufficiently reduced.

FIG. 8 is a diagram comparing the brightness of the high ceiling lighting device A according to the present invention and the conventional device B shown in FIG. 1 when the reflector plate is viewed from a vertical angle of 6σ to 80°.

As is clear from FIG. 8, the brightness at the reflective surface was reduced to 1/2 to 1/20 compared to the conventional one in the present invention, although it differed depending on the vertical angle, and glare was well reduced. This was confirmed.

Next, the case where Q is larger than 19° will be described.

That is, this is a case in which the lamp is inserted deeper into the inner part of the same reflector plate as in the above embodiment, and the lamp position is approximately 10 mm further back than in the case where Q=19°.

The above-mentioned Ql and Q2 are each 30° relative to Q1. Q
2 Ki becomes 16°, Q = figure (Q1 + Q2 ) = 23°
become.

Here, 23° + 5° = 28°, 23° - 5° = 18°, but if the protruding reflective surface 12 is formed beyond 28°, Q = : = Q1 as in the previous example, and the protruding Reflective surface 1
2 increases, the proportion of reflected light that is controlled in the horizontal direction increases, and the light distribution spreads more than necessary, which in particular causes problems such as poor workability and increased costs.

In addition, if it is less than 1, in rare cases, as in the previous example, Q”:
Q2, the formation range of the protruding reflective surface becomes small, and there is a problem that reflected light glare is not sufficiently reduced.

Next, the case where Q is smaller than 19° will be described.

With the same reflector as the above actual case, place the lamp about 10mm on the light emitting aperture side.
This is the case where it is positioned at mm.

The above-mentioned Ql and Q2 are 10° in Q1==22°t Q2, and Q=(Q.

+Q2)=16°.

Here, 16°+5°=21°. 16°-5°-11°
becomes.

And forming a protruding reflective surface beyond 21 degrees means that
Q=:=Q1, and more protruding reflective surfaces 12 are formed than necessary, leading to unnecessary processing and increased costs.

However, as Q decreases, the ratio of the area where the protruding reflective surface is formed tends to decrease when viewed from the entire reflective surface.Also, as Q gradually decreases, the lamp moves closer to the light emitting aperture. The shading angle becomes smaller, direct light glare increases more than reflected light glare, and the glare reduction effect of the lighting device as a whole decreases, so the above Q = 7
Although the range of (Q1+Q2)±5° holds true, its effect is reduced.

Therefore, in this case, it is preferable to form the protruding reflective surface in the range of Q=i(Qt +Q2).

If the angle is less than 11°, Qkm2 will result, and there will be the same inconvenience as in the previous example.

In this way, the vertical angle 60, commonly referred to as the glare zone,
When viewing the lighting device from a direction of 80° to 80°, the range that forms the protruding projection surface is Q = 2 (Qt + Q2) ± 5°
was confirmed to be the most appropriate range.

In this way, flat reflective surfaces 13 are formed radially adjacent to the protruding reflective surfaces 12 on the reflective plate 10, and flat reflective surfaces 13 are formed on these protruding reflective surfaces along the direction of the rotation axis. Therefore, the light from the lamp 15 is incident on the slope 12a of the protruding reflective surface 12, and the light reflected on this slope 12a is also sterilized in the horizontal direction.

Further, a flat surface 1 formed adjacent to the protruding reflective surface 12
The light incident on 3 is reflected and sterilized in the vertical direction.

Since the flat reflective surface 13 is formed adjacent to the protruding reflective surface 12, reflection between the protruding reflective surfaces 12 does not occur, resulting in less light loss and increased instrument efficiency. Since the flat reflecting surface 13 has a basic rotational quadratic curved surface shape 18, the required light distribution can be easily obtained.

Next, a second embodiment of the present invention will be described with reference to FIG.

That is, the rotating body reflecting plate 10 is not limited to a rotating quadratic curved surface, but may be formed in a truncated conical shape.

Note that the same parts as those in the first actual case are given the same reference numerals and explanations will be omitted.

Even in this case, the protruding reflective surface 12 and the flat reflective surface 12 adjacent to the protruding reflective surface 12 must be formed in the same range as in the first embodiment.

In the above embodiment, the protruding reflective surface 12 is formed in the shape of a triangular prism with a pointed top, but it may be formed in the shape of a triangular prism with an arc or flat top, for example.

As described in detail above, according to the present invention, the reflected light emitted from the lamp is widely dispersed and shines on the protruding reflective surface, and even when looking at the reflective plate from below, reflected light glare is reduced, causing discomfort. Never give up.

In addition, since the protruding reflective surfaces and flat reflective surfaces are formed alternately and within a specific range, it is possible to moderately suppress unnecessary spread of light distribution and easily obtain the desired light distribution, while also making it possible to easily obtain the desired light distribution. Both transparent lamps and diffused lamps whose light-emitting parts can be seen from outside the envelope can be used in common, and parts can be made common, which is advantageous in terms of manufacturing and parts management.

Further, the protruding reflective surface and the flat reflective surface formed on the reflector only need to be formed in a specific area of the reflective plate, and the reflector has good force measurement properties, requires less processing time, and can be provided at low cost.

Furthermore, since the flat reflective surface is formed adjacent to the protruding reflective surface, repeated reflections between the protruding reflective surfaces are prevented, resulting in less light loss and increased instrument efficiency.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of a conventional lighting device;
3 is an enlarged perspective view of section A in FIG. 2, FIG. 4 is an explanatory diagram of the same reflector plate, and FIG. 5 a , b, and c are explanatory diagrams of the formation range of the protruding reflective surface of the same reflecting plate as above, FIG. 6 is a partially cutaway perspective view of a lighting device showing another embodiment, and FIG. 7 is a lighting device in which the present invention is implemented. 8 is a luminance comparison diagram. 10...Rotating body reflecting plate, 11...Light projection aperture, 12...Protruding reflective surface, 12a...
・Slope, 13...Flat reflective surface, 15...
... Lamp, 16... Light emitting part.

Claims (1)

[Scope of Claims] 1. A lamp, and a rotating body reflecting plate that encloses the lamp and has a light emitting opening on its lower surface, wherein the rotating body reflecting plate connects the lower end of the light emitting part of the lamp and the light emitting part. Let Ql be the angle formed by the straight line connecting the edge of the opening and the surface of the light emitting aperture, and the angle between the straight line connecting the edge of the light emitting aperture and the lower end of the outer envelope surrounding the light emitting part of the lamp and the light emitting aperture. Let Q2 be the angle formed by the plane, and the angle Q between the straight line inward from the edge of the light emitting aperture and the light emitting aperture surface is Q-2 (Qt +
Q2) A single protrusion in the shape of a triangular prism that protrudes inward along the radial direction and has symmetrical slopes on both sides along the radial direction, with the apex located inward. 1. A lighting device comprising a reflective surface and a plurality of flat reflective surfaces formed adjacent to the protruding reflective surface along the radial direction and alternately arranged along the rotation axis direction.