JPS5927044B2 - 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, lighting equipment installed on relatively high ceilings such as gymnasiums and factories to illuminate floors and work surfaces uses a rotating body reflector formed into a rotating quadratic curved surface with a light projection opening on the bottom surface, and It is known that the lamp consists of an enclosed lamp such as a high-intensity discharge lamp, and the light emitting opening is covered with a light-transmitting cover to prevent the reflective surface and the lamp from getting dirty.

However, since the translucent cover is generally made of a reinforced glass plate, it is very heavy, and it is troublesome to attach and detach it, making it time-consuming to replace the lamp.
There are drawbacks such as poor light transmittance depending on the thickness of the glass plate.

For this reason, plastic film covers such as thin fluororesin films have come to be used as light-transmitting covers.

When a plastic film cover is used as the light-transmitting cover in this way, the weight is very light and the cover itself is very thin, resulting in good light transmittance and high appliance efficiency.

However, the light-transmitting cover used for the light projection opening of the rotating body reflector, which is most commonly used as a reflector, is required to have high heat resistance and yellowing resistance.

This means that lighting fixtures used for indoor lighting require a moderately wide light distribution, so a reflector that uses a quadric surface of revolution, especially a paraboloid of revolution, will be able to move the parabolic axis around the axis of rotation. In addition, since a high-intensity discharge lamp is used as the lamp, the center of the translucent cover that blocks the light emitting opening of the reflector plate is designed to prevent light from the high-intensity discharge lamp. This is because strong reflected light is concentrated and a hot spot of high temperature is generated.

However, in the above-mentioned reflector, even though the fluororesin film has excellent heat resistance and yellowing resistance, the hot spot area is subject to large elongation and warp due to the high temperature, resulting in a decrease in product quality and mechanical function. There is a risk that a decrease may occur.

For this reason, a method has been proposed in which the reflected light is dispersed to prevent hot spots.

For example, as seen in Japanese Patent Publication No. 50-4985, in a lamp equipped with a lamp, a rotating mirror surface surrounding the lamp, and a translucent panel provided at the light projection opening of the reflector, the reflector 3 and A cylindrical heat shield with a serrated or wavy shape is arranged along the circumference between the translucent panel and the reflected light from the reflector towards the center of the translucent panel is dispersed in the horizontal direction. A device is known that prevents reflected light from concentrating in the center of a photosensitive panel and causing a high temperature.

This device can prevent excessive temperature rise at the center of the translucent panel to some extent, but since a cylindrical heat shield is provided inside the reflector, the light reflected by the reflector is reflected back into the heat shield. Since the light emitted from the light projection aperture is repeatedly reflected, the light emitted from the light projection aperture may be reduced and the efficiency of the fixture may be lowered.

Also, this requires a separate heat shield,
There is an inconvenience that the number of parts increases and the work of fixing them to the reflector increases, resulting in an increase in cost.

Furthermore, the provision of a translucent panel makes lamp replacement troublesome, and the provision of a heat shield makes lamp replacement even more troublesome.

Furthermore, since the heat shield is placed relatively close to the light-transmitting panel, the heat shield casts a shadow on the light-transmitting panel, impairing its appearance and reducing its marketability as an indoor lighting fixture.

For this reason, it may be possible to prevent hot spots by processing the reflector to diffuse light without providing a heat shield.

For example, Japanese Patent Publication No. 33-1936 discloses a device in which the range of the reflected light beam is changed by changing the area ratio of the smooth surface and the light-scattering reflective surface by rotating a movable reflecting plate, thereby condensing or diffusing the light beam. is disclosed.

In this case, the light is dispersed by increasing the area of the light-diffusing and reflecting surface, so it is thought that the generation of hot spots can be prevented to some extent even if a light-transmitting panel is provided in the light projection aperture.

However, in this case, the light reflecting surface is formed by a hammer-like unevenness on the reflector plate, so the light reflected from the unevenness is reflected again by the unevenness, reducing the light emitted from the light projection aperture. This is not preferable as it may reduce the efficiency of the instrument.

Furthermore, in Japanese Patent Publication No. 51-17239, a large number of radially extending protrusions and grooves having a cross section consisting of circular arcs with radii R1 and R2 are formed, and the grooves are formed by the grooves. A reflector is disclosed.

This type has convex stripes and concave stripes formed in succession, and is suitable for reducing strong light in the optical axis direction to obtain a uniform light distribution, but this one is also suitable. Since the protruding stripes and the grooved stripes are formed continuously, the direction of reflection of the light reflected from the protruding stripes increases as it approaches the adjacent grooved stripes, so that the reflected light returns to the grooved stripes. This is not desirable because it may reflect and reduce the light emitted from the light projection aperture, reducing the efficiency of the fixture.

Furthermore, as seen in US 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 along the circumferential direction, the light reflected from the vertical grooves, especially near the valleys, is reflected again by the adjacent vertical grooves, and the light is emitted. This is not preferable because the light emitted from the opening may be reduced and the efficiency of the instrument may be reduced.

The present invention has been made in consideration of the above-mentioned circumstances, and by preventing the generation of high-temperature hot spots on the light-transmitting cover of the light emitting aperture of the rotating body reflector, the above-mentioned cover is made of light-transmitting plastic. It is an object of the present invention to provide a lighting device which is superior in merchantability and mechanical function and has improved efficiency by making it possible to use a film.

The present invention includes a lamp, a rotating body reflecting plate containing the lamp, and a translucent plastic film cover that blocks a light emitting opening of the rotating body reflecting plate, and the rotating body reflecting plate is arranged along the radial direction. A single triangular prism-shaped protruding reflective surface that protrudes inward and has symmetrical slopes on both sides along the radial direction, with the top positioned inward, and a triangular prism-shaped single protruding reflective surface that is adjacent to this protruding reflective surface in the radial direction. The present invention is characterized in that a plurality of flat 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.

Reference numeral 1 denotes a rotating body reflecting plate, and this rotating body reflecting plate 1 is formed, for example, into a rotating quadratic curved surface and has a light projection opening 2 on its lower surface.

Reference numeral 3 denotes a translucent plastic film cover that closes the light projection opening 2, and this cover 3 is made of, for example, a fluororesin film.

4 is a lamp, and this lamp 4 is, for example, a high-intensity discharge lamp, and is attached to a socket 4 provided at the base of the reflector plate 1.
It is included in the reflection plate 1.

This lamp 4 is, for example, a transparent lamp in which a light emitting part 7 is enclosed in a transparent envelope 6.

As shown in FIG. 2, the reflecting plate 1 is shaped like a triangular prism, which projects inward from the inner surface, has symmetrical slopes 9.9 on both sides along the radial direction, and has the apex located inward. A single protruding reflective surface 8 and a plurality of flat reflective surfaces 10 formed adjacent to the protruding reflective surface 8 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 8 at intervals on the reflecting plate 1 formed as a rotational quadratic surface, a basic rotational quadratic curved surface is formed between these protruding reflective surfaces 8. A plurality of flat reflective surfaces 10 having a shape are formed, and protruding reflective surfaces 8 and flat reflective surfaces 10 are alternately formed adjacent to each other.

The protruding reflective surface 8 and the flat reflective surface 10 are formed extending from the intermediate portion of the reflective plate 1 to the light projection opening 2.

Next, the effect will be explained.

The light from the lamp 4 is reflected by the reflective surface of the reflector plate 1.

At that time, a flat reflective surface 10 formed between the protruding reflective surfaces 8
The incident light is reflected and irradiated in the vertical direction, and the light is controlled in the vertical direction, and is incident on the slope 9 of the protruding reflective surface 8, and the light reflected on this slope 9 is irradiated in the horizontal direction as shown in FIG. The light is controlled and dispersed and shines over a wide range, and as shown in FIG. In this case, the temperature of the glass cover 3 with the protruding reflective surface 8 is clearly lower than that without the protruding reflective surface 8.
It was confirmed that the occurrence of hot spots was effectively prevented.

Further, since the flat reflective surface 10 is formed adjacent to the protruding reflective surface 8, reflection between the protruding reflective surfaces 8 does not occur, resulting in less light loss and improved instrument efficiency.

Note that the protruding reflective surface 8 is formed without forming the flat reflective surface 10.
If they are formed continuously, more light will be irradiated and dispersed in the horizontal direction, and the effect of reducing hot spots in the film cover 3 will be improved, but reflections between adjacent protruding reflective surfaces 8 will occur, and the light will be It was confirmed that losses increased and instrument efficiency decreased.

In the actual case, the protruding reflective surface 8 and the flat reflective surface 10 are provided near the light emitting opening 2 of the reflective plate 1, but they may be formed on the entire inner surface of the reflective plate 1.

Further, although the protruding reflective surface 8 is formed in the shape of a triangular prism with a pointed top, it may be formed in the shape of a triangular prism with an arc or flat top, for example.

Furthermore, the flat reflective surface 10 may be formed into a flat surface.

In addition, if a plastic film cover other than the fluororesin film cover used in the above-mentioned actual case is used as a translucent plastic film cover, such as a polycarbonate film with high heat resistance, the radiation from the high-intensity discharge lamp may It is not preferable to use a high-intensity discharge lamp as the lamp gradually yellows due to the ultraviolet rays.

As described in detail above, according to the present invention, the light from the lamp is controlled in the horizontal direction by the protruding reflective surface, the reflected light that gathers toward the center is reduced, and the reflected light is extremely concentrated at the center of the light projection aperture. It is never illuminated.

Therefore, even if the light emitting aperture of the reflector is closed with a translucent plastic film, the high temperature spot on the film cover is alleviated, and it is possible to prevent the film cover from warping and yellowing due to high temperatures. A lighting fixture with extremely high functional functionality and commercial value can be obtained.

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 improved instrument efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the lighting device of the present invention, FIG. 2 is an enlarged view of its main parts, and FIG. 3 is an explanatory diagram of its operation.
FIG. 4 is a graphical diagram of its function. 1...Rotating body reflector, 2...Light projection aperture, 3...Translucent plastic film cover,
4...Lamp, 8...Protruding reflective surface, 9
... Slope, 10 ... Flat reflective surface.

Claims (1)

[Scope of Claims] 1. A lamp, a rotary reflecting plate that encloses the lamp and has a light emitting opening on the lower surface, and a translucent plastic film cover that blocks the light emitting opening of the reflector. , The rotating body reflector is a single triangular prism-shaped body that protrudes inward along the radial direction, has symmetrical flat slopes on both sides along the radial direction, and has the apex located inward. 1. A lighting fixture comprising a plurality of protruding reflective surfaces and a plurality of flat reflective surfaces formed adjacent to the protruding reflective surfaces along the radial direction, alternately along the rotation axis direction. 2. The lighting fixture according to claim 1, wherein the translucent plastic cover is a fluororesin film cover.