JPS5927042B2 - lighting equipment - Google Patents

Description

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

For example, the reflector plate 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 a rotating quadratic curved surface, especially a rotating quadratic curved surface, as shown in FIG. A paraboloidal configuration 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 scattered light has a strong influence on 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 device, the light reflected by the uneven parts of the diffuser reflecting surface is reflected again by the uneven parts, making it impossible to control the light in the desired direction. There is a risk that this will reduce the efficiency of the fixture, making it unsuitable for use as a reflector that reduces glare from reflected light while obtaining a desired light distribution.

In addition, in Japanese Patent Publication No. 51-17239, radius R is
A reflector is disclosed in which a large number of radially extending convex stripes and four stripes are formed, each having a cross section consisting of an arc of R2, and a concave strip is formed by the stripes.

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 four 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 facing inward near the opening may shine, causing reflected light glare when viewing the reflective plate from below.

Furthermore, with this type of device, the direction of reflection of the light reflected from the convex strip increases as it reaches the adjacent concave strip, so the reflected light is reflected back to the concave strip, making it impossible to control light in the desired direction sufficiently. 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 U.S. Pat. No. 3,401,258, a reflection plate in which vertical 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 in a pharmacopeia, 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 of not only reflected light glare but also a decrease in light output and equipment efficiency.

The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a lighting fixture that reduces reflected light glare and appropriately suppresses unnecessary spread of light distribution.

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. A single triangular prism-shaped protruding reflector that protrudes inward along the radial direction from the top to the light projection aperture, and has symmetrical slopes on both sides along the radial direction, with the top positioned inward. It is characterized in that a plurality of planes and a plurality of flat reflecting surfaces formed along the radial direction adjacent to the protruding reflecting surfaces are formed alternately along the rotation axis direction.

The details of the invention will be explained below with reference to the illustrated embodiments.

2 to 6 show an embodiment of the present invention.

Reference numeral 3 denotes a rotating body reflecting plate. The rotating body reflecting plate 3 is formed, for example, into a rotating quadratic curved surface, has a light projection opening 4 on its lower surface, and is formed to expand toward the light projection opening 4.

This reflecting plate 3 is protruded inwardly along the radial direction and has symmetrical slopes 10 and 1 on both sides along the radial direction.
A single protruding reflective surface 9 in the shape of a triangular prism having a radius of Multiple pieces are formed along each line.

That is, by forming a plurality of single triangular prism-shaped protruding reflective surfaces 9 at intervals on the reflecting plate 3 formed into a rotational quadratic curved surface, the basic rotational quadratic curved surface shape is formed between these protruding reflective surfaces 9. A plurality of protruding reflective surfaces 9 and flat reflective surfaces 11 having a plurality of flat reflective surfaces 11 are formed adjacently and alternately.

Reference numeral 5 denotes a lamp, and this lamp 5 is, for example, a high-intensity discharge lamp included in the rotating body reflecting plate 3. The lamp 5 is mounted in a socket 6 provided at the base of the reflecting plate 3, and is arranged on the rotation axis of the reflecting plate 3. ing.

This lamp 5 is a transparent lamp in which a light emitting part 8 is enclosed in a transparent envelope 7.

Then, the protruding reflective surface 9 and the flat reflective surface 11
must be formed extending from an extension of a straight line connecting the lower end of the light emitting portion 8 of the lamp 5 and the edge of the light emitting aperture 4 of the reflector 3 to the light emitting aperture 4.

Generally speaking, reflected light glare is a problem for reflectors in this type of lighting equipment when viewed from a vertical angle of 60° to 80°, and glare includes direct light glare from the lamp and reflective surface. Therefore, even if only direct light glare is reduced, the effect will be small.

Therefore, it is conceivable to form the protruding reflecting surface 9 and the flat reflecting surface 11 over almost the entire inner surface of the reflecting plate 3. In this case, the reflected light is dispersed by each protruding reflecting surface 9 and the reflected light glare is reduced. However, the effect of reducing reflected light glare by the protruding reflective surface near the base of the reflector plate 3 is low;
In addition, since each protruding reflective surface 9 also controls the reflected light in the horizontal direction, forming the protruding reflective surface 9 to the vicinity of the base tends to spread the light distribution, and the required light distribution is relatively large, such as a sandwich type or medium heat type. This is not preferable when trying to obtain a narrow light distribution.

In addition, the protruding reflective surface 9 and the flat reflective surface 11 are connected to the lamp 5.
0 If the projecting reflective surface 9 and the flat reflective surface 11 are formed from below to the light emitting aperture, which is less than the extension of the straight line connecting the lower end of the light emitting part 8 and the edge of the light emitting aperture 4 of the reflecting plate 30. Although the range may be small, the amount of reflected light dispersed by the protruding reflective surface 9 decreases, so there is a risk that sufficient reduction of reflected light glare may not be achieved.

Then, the protruding reflective surface 9 and the flat reflective surface 11 are connected to 271
50 By forming the protruding reflective surface 9 from the extension of the straight line connecting the lower end of the light emitting part 8 and the edge of the light emitting aperture 4 of the reflector plate 3 to the light emitting aperture 4, the protruding reflective surface 9 can be formed in a minimum range and reflect light. It is possible to reduce glare satisfactorily.

Next, the effect will be explained.

Reflected light glare is a problem mainly when looking at the reflector 3 from a vertical angle of 60° to 80°, but when looking at the reflector 3 from a 70° direction, the lamp 5 is located inside the reflector 3. In this case, the light emitted from the lamp 5 enters the slope 10 of the protruding reflective surface 9, and the light reflected on the slope 10 is controlled not only in the vertical direction but also in the horizontal direction. Ru.

Further, the light incident on the flat reflective surface 11 formed adjacent to the protruding reflective surface 9 is reflected and irradiated in the vertical direction, and the light is controlled in the vertical direction.

Since the flat reflective surfaces 11 are formed between the protruding reflective surfaces 9, reflection between the protruding reflective surfaces 9 does not occur, resulting in less light loss and improved instrument efficiency.

Further, the light is dispersed and reflected by the protruding reflective surface 9 and shines over a wide range.

On the other hand, the luminous intensity at a vertical angle of 70° is I? Assuming that O is obtained, the brightness of each reflective surface B a +Bb is related to the bright area S a ssb of each reflective surface, and the following is obtained.

In these equations (1) and (2), Sa x Sb
By alternately providing the flat reflective surfaces 11 and 11, reflected light glare is reduced.

In this way, reflected light glare in the range of the inner surface of the reflector plate visible within the lamp shading angle is reduced, and the protruding reflective surface 9 and flat reflective surface 11 of the reflector plate 3 are
The light distribution of the reflected light in the range 12 formed from the extension of the straight line connecting the lower end of the reflector plate 3 and the edge of the light emitting aperture 4 to the light emitting aperture 4 is as shown in FIG. 6a.

Furthermore, since the reflected light in the upper range 13 of the reflecting plate 3 that does not form the protruding reflective surface 9 is reflected by a quadratic curved reflecting surface such as a paraboloid of revolution, the reflected light in this range 130 is controlled in the direct downward direction. It is easy to do this, and the light distribution as shown in Figure 6 is obtained.
The overall light distribution of this reflector plate 3 is as shown in FIG. 6C, and a medium heat type light distribution can be easily obtained.

Furthermore, since a protruding reflective surface that reduces glare from reflected light is formed near the light emitting opening, processing at the time of manufacturing the reflective plate becomes easy and the cost can be reduced.

In addition, when using a diffused lamp 5 in which the outer envelope 7 of the lamp 5 is made opaque by coating a phosphor, etc.,
Since the outer envelope 7 of the lamp 5 becomes the light emitting part, in this case Ir
i As shown in FIG. 8, a reflective surface 9 and a protruding reflective surface 9 extend from the inner surface of the reflector 3 on the extension of the straight line connecting the lower end of the lamp 5 and the edge of the light emitting aperture 4 of the reflector 3 by 4 inches of the light emitting aperture. A flat reflective surface 11 may be formed.

In this case as well, as in the case of the transparent lamp described above, reflected light glare is reduced and the desired light distribution can be easily obtained.

Further, in the case of using a diffused type lamp, the protruding reflective surface 9 and the flat reflective surface 11 can be formed in a smaller area than in the case of a transparent type lamp, and the workability is improved.

In the above embodiment, the protruding reflective surface 9 is formed in the shape of a triangular prism with a pointed top, but it may also be formed in the shape of a triangular prism with a flat top as shown in FIG. It may also be formed into an arcuate triangular prism shape.

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.
Even if you look at the reflector from below, the reflected light glare is reduced, so you won't feel uncomfortable.

Furthermore, since the protruding reflective surface is formed in the minimum range on the light emitting opening side, the processability during manufacturing of the radiation plate is good, the processing time is shortened, and the radiation plate can be provided at low cost.

Furthermore, since the protruding reflective surfaces and the flat reflective surfaces are formed alternately, repeated reflections between the protruding reflective surfaces are prevented, reducing light loss and increasing the efficiency of the instrument.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view of a conventional lighting fixture;
3 is an enlarged perspective view of section A in FIG. 2, and FIG. 4 is a sectional view of the same as above.
Fig. 5 is a cross-sectional view showing the same reflected light as above, Fig. 6 a, b, and c are light distribution curve diagrams, Fig. 7 is an enlarged view of a part of the reflector plate showing another embodiment, and Fig. 8 is another example. FIG. 2 is a cross-sectional view of a lighting fixture showing an example. 3...Reflector plate, 4...Light projection aperture, 5.
...Lamp, 7...Outer enclosure of lamp 5,
8... Light emitting part, 9... Triangular prism-shaped protruding reflective surface, 10... Slope, 11... Flat reflective surface.

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 is connected to the light emitting lower end of the lamp and the light emitting opening. A triangular shape that protrudes inward along the radial direction from the straight line connecting the edge to the floodlight opening, and has symmetrical slopes on both sides along the radial direction, with the top positioned inward. It is characterized by a plurality of columnar single protruding reflective surfaces and a plurality of flat reflective surfaces formed adjacent to the protruding reflective surfaces along the radial direction, each alternately formed along the rotation axis direction. lighting equipment.