JPS5927045B2 - Show Meikigu - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a lighting fixture that is used with a high-intensity light source in places with relatively low ceilings such as schools, offices, and shops, and in particular a high-intensity discharge lamp that does not generate glare. Regarding lighting equipment, high-intensity discharge lamps have been used for indoor lighting, but are becoming more popular for outdoor lighting.

Such discharge lamps exhibit extremely high luminous efficiencies of approximately 50-120 lumens/watt.

However, discharge lamps have extremely high brightness, as low as 3.00
0 to i, o o o, o o o Indicates footlambert brightness.

Indoor spaces have surfaces that differ in brightness between 10 and 100 footlamberts under normal lighting, and lighting in such spaces is designed to avoid producing large glare that would adversely affect human vision. This should be done with suitable equipment.

This glare is said to be "large" when the ratio of brightness in each part of the room exceeds 10:1, so the brightness in the room is at most 1
Limited to 00 to 1,000 foot lamberts.

Due to the high brightness of the discharge lamp, it must not be visible directly, nor should the image of the light source be visible in a reflector or lens cooperating with the light source.

In the past, incandescent bulbs or fluorescent lights were commonly used for indoor lighting.

Generally, fluorescent lights are not so bright as to produce glare that adversely affects human vision.

However, most light sources are encapsulated and controlled by lenses or diffusion means to reduce or stabilize the brightness.

Additionally, lighting fixtures are typically designed so that high-brightness areas are eliminated or only visible from angles where glare is not harmful.

In one of the more common forms of lighting using a high-intensity light source, the lamp is a dish-shaped reflector that is mounted or suspended from the ceiling with its opening facing downward. It is arranged in the axial direction inside the vessel.

However, such lighting equipment cannot be put to practical use as it is, even if the ceiling is relatively high.

Although direct glare can be reduced by placing a refractor or lens over the aperture, this creates other problems.

Thus, high intensity discharge lamps radiate a considerable amount of heat.

If that heat is taken into the fixture, it may distort the color of the lamp's emission and shorten its lifespan.

Furthermore, unless the contamination on the refractor is kept to a minimum through regular maintenance, glare control ability is reduced.

Some conventional devices for controlling glare have used special reflectors that, either by their shape or in combination with prismatic refractors, restrict light from entering the normal field of view.

In such luminaires, the aperture often has a cone that is painted black or otherwise matte to limit the visibility of the bright components.

For this purpose, the opening is sometimes covered with a bar.

However, in both cases these components reduce the efficiency of the energy absorbing device.

In view of these circumstances, it is an object of the present invention to provide a lighting fixture that uses a high-intensity light source that is efficient and does not generate large glare that adversely affects human vision. .

The invention combines the advantages of indirect lighting devices with those of high-intensity discharge lamps.

In indirect lighting devices, the lamp, lens, or reflector is hidden behind the fixture and is not directly visible.

In this way, glare in high-intensity areas is hidden.

However, because high-intensity discharge lamps have extremely high luminous efficiency, they can now be used in areas that previously required many incandescent bulbs and fluorescent lamps. It is comprised of a ridge and a holding means for supporting both in a positional relationship as detailed below, and is characterized in that the shape of the reflecting ridge is designed with optical considerations in mind.

It should be noted that even if an attempt is made to connect a high-intensity discharge lamp to indirect lighting without considering the optical control as in the present invention, it is possible to obtain an apparatus that is somewhat similar in appearance to the present invention. I can do it.

However, the light distribution curve of such a luminaire is as shown in Figure 3, and even though such a luminaire can sufficiently remove light below the horizontal plane, most of the energy is absorbed by the luminaire. 90 degrees at 45° on both sides of the upper vertical plane
It falls within the range of °.

This convergence of energy is unacceptable in most installations because only the ceiling near the luminaire receives most of the light.

Optical designs such as the present invention are necessary to obtain acceptably uniform illumination across the entire ceiling.

That is, in a preferred embodiment of the invention, an ellipse is used as the optical shape, and the inner surface of the reflective surface has one focal point at the position of the light source along the arc tube of the lamp and the other focal point at the outer edge of the reflective surface. It forms part of the outer peripheral surface when an ellipse like the one above is rotated around the vertical axis of the light source.

The downward offset of the focal point on the light source from the horizontal plane is equal to the height of said other focal point from the outer edge, maximizing the amount of light emitted above the horizontal plane.

This design of the reflective sill directs the light emitted by the lamp upwards, either directly or reflected, and the reflected light is reflected as close to the horizontal plane as possible.

Furthermore, this shape minimizes the amount of light directed below the horizontal plane and maximizes the amount of light directed above.

The efficiency of the appliance is ensured by emitting almost all the light emitted by the lamp out of the appliance by at most one reflection.

In other words, most of the light is emitted outside the fixture without being taken into the fixture, refracted, or reflected by the lamp, socket cover, holding means, or the like.

Also in a preferred embodiment of the invention, the sidewalls of the reflective surface are folded segments that are slightly inclined relative to the path of the light from the light source.

This tilt causes the light to be reflected away from the socket cover, lamp or retaining means and towards said other focal point, which is just above the outer edge of the reflective surface as described above.

By adding such pleat segments along the sidewalls of the reflector, energy can be prevented from being absorbed by such members.

The lamp is mounted vertically, ie the axis of the lamp is placed vertically inside the reflector which is open upwardly towards the ceiling.

In fact, the device of the present invention can be placed anywhere from 18 inches to several feet from the ceiling.

Moreover, the effects of the present invention are not diminished by the shape or angle of the ceiling, and the device of the present invention can be used even on flat ceilings, sloping ceilings, and even irregularly shaped ceilings. Even if there is, you can hang it down.

The reflector is placed around the lamp so that it is not visible from any position below the horizontal plane.

Furthermore, the reflector is designed so that the reflected image of the light source is also not directly visible.

The lamp and reflector are attached at one end to the ceiling and at the other end to the device by conventional and known methods.
Can be suspended by a book tube.

This tube is attached to the socket into which the lamp is inserted,
Preferably, the reflector is held by spokes extending radially from its socket or socket holder.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially cutaway side view of a lighting fixture according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

In FIG. 1, the lighting fixture of this embodiment has a substantially circular outer edge 2.
and a bottom portion 3.

The bottom part 3 is integrally provided at the lower end part 4 of the platen 1.

The inner side of the plate 1 is provided with a plurality of folds 9 for the purpose of improving the distribution of light rays, as will be explained later.

A high-intensity discharge lamp 6 is mounted on a support shaft 5 inside the optical system.
It extends almost vertically downward.

Examples of the discharge lamp include a mercury lamp, a high-pressure sodium lamp, and a metal halogen lamp.

As is well known, such lamps typically have a glass outer envelope enclosing a hollow-sealed elongated arc tube having spaced-apart opposing electrodes at each end thereof. .

The arc tube is supported inside the outer tube by a harness-like frame that forms part of the electrical system.

The rest of the electrical system connects the cap and its arc tube.

When the lamp is lit, the metal ions placed between the electrodes form a path of low resistance, which allows an interelectrode discharge to occur and form an elongated light source.

The light source is positioned relative to the base 1, its outer edge 2 and its bottom 3 in such a way as to provide the light intensity distribution as here discovered.

This setting is made by fixing the socket cover 7 and the radially extending spokes 8.

The spokes 8 extend from appropriate positions on the socket cover 7,
The attachment provided on the lower end portion 4 of the further 1 is preferably attached to a metal fitting.

Furthermore, 1 is approximately symmetrical about its vertical axis,
Its horizontal cross section is a circle whose diameter decreases as it approaches the lower end 4 from the outer edge 2.

Furthermore, the plate 1 may be constructed approximately in the form of a circle with a very large number of flat segments.

As shown in FIG. 2, a plurality of vertically disposed pleats 9 are provided inside the platen 1.

Most advantageously, such pleats 9 extend upwardly from the lower end 4 to reach the outer edge 2.

The pleats 9 may be integrally formed with the platen 1 and virtually form the sides of the platen 1, or may be molded to be inserted into the platen forming the outer frame so as to extend from the lower end 4 to the outer edge 2. It may be the body.

The folds 9 are arranged so that light emitted from a light source in a substantially horizontal plane is reflected by the folds 9 and passes just above the outer edge 2 to exit the reflector.

As mentioned above, this fold 9 provides an orientation to redistribute the light so as not to create heavy glare.

The reflected light avoids the lamp 6, the socket cover 1, and the support shaft 5, passes above the outer edge 2, and exits.

Of course, the light emitted upward from the lamp 6 passes above the outer edge 2 and enters the room as illumination.

The bottom part 3 is lined with a reflective or refractive surface, which is arranged so as to diffuse the light rays directed towards it.

This reflective surface can be formed by various methods such as etching, peening, embossing, etc.

However, it is preferable to use a sheet of plastic, glass, etc., cut to fit with the lower end 4.

The apparatus of this example is constructed in this way, and the distribution of energy from the light source is maximized just above the horizontal plane.
It gradually decreases to a minimum directly above the light source.

Such energy distribution makes it possible to uniformly illuminate the entire ceiling.

Here, the ceiling becomes a light source for illuminating other parts of the room, and thus the brightness ratio of each part of the room can be maintained within 10:1.

In this way, high intensity light sources can be used indoors and can be made to meet the suitability requirements of such spaces.

Figure 3 shows the light distribution curve for an indirect lighting fixture that uses a high-intensity light source and does not take optical control into consideration.
The figure shows the light distribution curve in the device of the present invention using a 400W high-intensity discharge lamp coated with phosphor as the light source, and Figure 5 shows the light distribution curve in the device of the invention using a transparent 400W high-intensity discharge lamp. It is a figure which shows each curve.

In FIGS. 3 to 5, the measurement is performed within a plane including the photometric lamp and the holding shaft, and the value at each angle is the average value at that angle.

As shown in FIGS. 4 and 5, when the lighting fixture of the present invention is used, almost all the light emitted from the light source is directed upwards, and from angles greater than the horizontal plane, the lamp shines. can not see.

Further, the illumination intensity is maximum at an angle of 70° from the vertical.

The illuminance at the ceiling therefore exhibits acceptable brightness within a radius of 10-20 feet.

Here the ceiling and upper walls reflect the light rays throughout the room.

In a room in which one such lighting fixture is placed within a 20-foot square, the luminous intensity ratio is within 10:1 at all viewing angles on the ceiling and in the room.

Therefore, almost no glare occurs.

Embodiments of the invention are as follows.

■ In the lighting equipment according to claim 1 or embodiment 1, the reflective roughness allows almost all the light emitted from the light source to be emitted outside the equipment by at most one reflection. 1. A lighting fixture characterized by having an optical shape arranged in such a manner that light beams are not taken into the fixture.

2. The lighting fixture according to claim 1 and embodiments 1 and 2, which can be hung from the ceiling.

3. The lighting device according to the embodiment on page 2, characterized in that the folded reflective surface minimizes the amount of reflection that hits the light source.

4. The lighting device according to embodiment 4, wherein the pleated reflective surface forms reflective roughness.

5. A lighting device according to claim 1 and embodiments 1 to 5, characterized in that a catadioptric device is provided on the bottom.

6. The lighting device according to Embodiment 3, characterized in that the reflective rib is supported by a plurality of radial arms extending from a socket cover that supports a socket and a light source.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a high-intensity discharge lamp as a light source.
Figure 4 shows a light distribution curve for an indirect lighting fixture that does not take optical control into account as in the present invention. Figure 4 shows a light distribution curve for an indirect lighting fixture of the present invention that uses a 400W high-intensity discharge lamp coated with phosphor as a light source. Figure 5 showing the light distribution curve in
The figure also shows a light distribution curve when a transparent 400W high-intensity discharge lamp is used. 1...Reflection roughness, 2...Outer edge, 3...
...Bottom sound 4...Lower end, 6...
・Discharge lamp, 9... folds.

Claims (1)

[Claims] 1. A lighting fixture with a high-intensity light source that has an upper end with a circular outer edge, a diameter at the upper end that is larger than the diameter at the lower end, and a reflector that is formed to open upward. a bottom part integrally disposed at the lower end of the reflective rib, the light source being connected to the reflective rib in such a way that light emitted below a horizontal plane including the outer edge is reflected over the outer edge; comprising a holding means for holding substantially on a center line, and a holding means for holding the reflective roughness at a fixed spatial position with respect to the light source, and the shape of the reflective roughness is such that one focal point is at the position of the light source. A lighting fixture characterized in that the other focal point is a part of an outer circumferential surface of an ellipse rotated about a vertical axis passing through the light source, such that the other focal point is above the outer edge.