JPH0340441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an airport marker light with improved light distribution characteristics.

(Prior Art) The inventor of the present invention developed an airport beacon light constructed as shown in FIG. 1 as a runway light, runway end light, etc. provided on an airport runway. That is,
This marker lamp includes a lamp 1 having a coil filament wound into a flat coil shape and having a pair of flat parts, a pair of spheroidal reflectors 2 provided on both sides of the lamp 1, and the lamp 1. 1
The glass cylinder 3 includes the lamp 1 and the spheroidal reflecting mirror 2, the centers of which are substantially coincident with each other. According to JIS standards, a coil filament is a filament (metal wire) wound into a coil with a circular cross section, and has been widely used in lamps for lighting equipment. A flat coil filament is a coil filament that has been deformed into a flat shape.
Incidentally, since a filament is almost always used by being wound into a coil, those skilled in the art routinely refer to a coiled filament by the word filament.

The reason behind the use of flattened coil filaments is that the ICAO (International Civil Aviation Organization)
As shown in Fig. 6, which is the regulation for the They focused on the fact that in order to satisfy the isoluminance curve while effectively utilizing the lamp output, it is sufficient to use a light source with less light output in the vertical direction and more light output in the horizontal direction.

(Problem to be Solved by the Invention) In the airport beacon light shown in FIG. 1, the large-diameter open end 2a of the spheroidal reflector 2 has a shape cut off perpendicularly to the optical axis. A space (hereinafter referred to as surplus space) 4 in which no reflective surface exists is formed between the upper and lower edges of the open end 2a and the inner surface of the peripheral wall of the glass cylinder 3.

As mentioned above, in a lamp with a coil filament in the form of a flat coil, the light output in the direction perpendicular to the flat part (perpendicular to the plane of the paper in Figure 1B) is large, whereas the light output in the oblique direction gradually decreases. especially in the direction parallel to the flat part (the first
The light emitted has a narrow width in the vertical direction (up and down with respect to the paper surface in Figure B), and the reflected light in the vertical direction of the light emitting aperture end of the reflector is insufficient, so the light distribution characteristics in the vertical direction change as shown in Figure 2B. As shown by curve b, the light distribution has a narrow vertical spread.

In this case, it is difficult to satisfy the illuminance in the vertical direction in the isoluminance curve shown in FIG.

On the other hand, the inventor of the present application discovered that among the direct light that passes directly from the coil filament through the light emitting aperture, the light that passes near the end of the light emitting aperture is output in a wide angle direction with respect to the axis of the reflector. We focused on the fact that the light was outside the range of the isoluminance curve shown in Figure 6. From this point of view, in order to satisfy the illumination in the vertical direction in the isoluminance curve in Figure 6, it is possible to simply increase the length of the reflector, but this would result in less reflection. As the body size increases, the problem arises that the marker light itself also increases in size.

Also, although it is not an airport beacon light, it is
Additional lights for the vehicle were installed as shown in Figures 4 and 5 of Publication No. 57635. The purpose of this device is to emit light uniformly in all directions to eliminate the bright and dark areas of the headlight, and its configuration is as follows:
It has a reflecting mirror in a cylindrical casing and a light source that protrudes appropriately forward inside the reflecting mirror.As can be seen in Figures 4 and 5 of the above publication, the reflecting mirror has a light projection opening in the cylindrical casing. In addition, as for the light source, there is no disclosure or even suggestion of a flat coiled coil filament. Furthermore, although there is no indication that it is a lamp, the purpose is to project light uniformly in all directions, so assuming that it is a point light source, the light distribution of this additional light will be vertically elongated. Even if such a device is used as an airport beacon, it must have light distribution characteristics such that the illuminance within the horizontally expanding elliptical isoluminance curve range is greater than the specified illuminance, as shown in Figure 6 of the ICAO regulations. You can't get it.

Even if it were possible to use a coil filament in the form of a flat coil, the illuminance within the isoluminance curve range of a horizontally expanding ellipse as shown in Figure 6 of the ICAO regulations would exceed the specified illuminance. When using a coil filament lamp in the form of a flat coil to obtain optical characteristics, there was no problem that the light distribution characteristic in the vertical direction was a narrow light distribution with a narrow vertical spread, so the positional relationship between the flat part and the reflecting mirror was It is extremely difficult to identify.

As mentioned above, the present invention aims to obtain a light distribution characteristic in which the illuminance within the horizontally expanding elliptical isoluminance curve range is equal to or higher than a predetermined illuminance as shown in Figure 6 of the ICAO regulations. In view of the problem that when using a lamp with a coil filament of This was done based on the fact that the passing light does not substantially contribute to the light distribution of airport marker lights, and it is possible to efficiently arrange the lamps in the vertical direction without increasing the size of the marker lights more than necessary. The purpose of the present invention is to provide a beacon light for airports with improved light characteristics.

[Structure of the Invention] (Means for Solving the Problems) The airport marker light of the present invention has a substantially cylindrical marker light body disposed on the road surface, into which light is projected in a substantially horizontal direction from within the marker light body. A rotating secondary reflector and a lamp are disposed such that the lamp has a filament wound in a flat coil shape, and each flat portion of the coil filament is near the optical axis position of the reflector. The reflector is disposed within the marker light body so as to face the left and right reflecting surface portions of the reflector, and the reflector is arranged so that the vertical portion of the light emitting opening end is closer to the light emitting side than the left and right portion. It is characterized by the fact that it stands out.

(Operation) The operation of the above configuration will be explained. Regarding the light from the coil filament to the reflector, the light output in the direction perpendicular to the flat part is large, whereas the light output in the oblique direction is small, and furthermore, in the direction parallel to the flat part, the light emitting part has a narrow width. Therefore, the light output becomes even smaller.

Therefore, the portion of the reflecting surface in the vertical direction reflects less light than the portion in the left-right direction that faces the flat portion. However, since the vertical part of the light emitting aperture end protrudes more toward the light emitting side than the left and right parts, most of the direct light that passes directly from the coil filament through the light emitting aperture is actually used for airport purposes. This protruding part reflects the light that passes through the vicinity of the light emitting aperture end, which does not contribute to the light distribution of the marker light, so the lamp input does not have to be high.
Vertical light distribution within the desired light distribution range defined by ICAO can be improved.

Moreover, since the protruding part is vertical, the width of the reflector does not increase in the left-right direction, so the marker light becomes larger than if the entire light emitting aperture end of the reflector was simply extended. It will not be done.

(Embodiment) Fig. 3A is a cross-sectional view of an embodiment of the present invention, Fig. 3B is a longitudinal sectional view thereof, Fig. 4A is a plan view showing the overall configuration of the above embodiment, and Fig. 4B is a FIG. In these figures, the marker light main body 10 includes a lamp 11 that is provided with a coil filament that is erected at the center of a glass cylinder 13 and whose flat portion is parallel to the optical axis of the reflector and the axis of the glass cylinder; It has a pair of reflecting mirrors 12, 12 whose small-diameter open ends are positioned symmetrically with respect to the lamp 11.
In the figure, the rectangular part inside the lamp 11 is a flat part of the coil filament, and there is another flat part opposite this face. Although the flat portion is shown as a plane in the drawings, it is actually composed of adjacent filaments.

A length l from the small-diameter open end 12b, which is positioned symmetrically with respect to the lamp 11, to the point where both left and right edges of the light emitting aperture 12a touch the inner circumferential surface of the glass cylinder 13 is a spheroidal reflecting surface. A portion having a length m from the portion having the length l to the point where both upper and lower edges of the light projection opening 12a come close to the inner circumferential surface of the glass cylinder 13 is a paraboloid of revolution reflecting surface.

By configuring the reflectors 12, 12 as described above, the surplus space 4 in the conventional marker light shown in FIG. 1 does not exist.

Figure 5A is a line diagram showing the horizontal illuminance distribution of the above-configured marker light in comparison with that of a conventional marker lamp, and Figure 5B is a line diagram showing a comparison of the vertical illuminance distribution with that of a conventional marker lamp. It is a diagram. Figure 5A, Figure 5B
In the figure, curve a shows the illuminance distribution of the embodiment described above, and curve b shows that of the conventional marker light. From these figures, it can be seen that the portion of length m eliminates the surplus space 4, and in the conventional marker light, part of the light emitted from there to the outside of the glass cylinder A and D is reflected at the said portion, and the horizontal It can be seen that both the directional illuminance distribution and the vertical illuminance distribution have been improved to the desired range [parts A and C], but the improvement in the characteristics is particularly remarkable in the vertical illuminance distribution.

That is, the light directly emitted to the outside of the glass cylinder 3 from the surplus space 4 in FIG. For,
The effect of eliminating the surplus space in the length m portion of the present invention is significant, and the vertical illuminance distribution is significantly improved.

Note that the present invention is not limited to the above embodiments. For example, the reflector may have a configuration other than the combination of an ellipsoid of revolution and a paraboloid of revolution, and the point is that each flattened portion of the coil filament is on the optical axis of the reflector, on the left and right sides of the reflector. The object of the present invention can be achieved by arranging the lamps so as to face each of the reflecting surface portions, and by making the vertical portion of the rotating reflector light projection opening end protrude more toward the light projection side than the left and right portions. Can be done.

[Effects of the Invention] In the airport marker light of the present invention, each flat portion of the coil filament is located near the optical axis of the rotating secondary reflector,
Since it is disposed within the marker light body so as to face the left and right reflective surface portions of the reflector, the light distribution is narrow in the vertical direction and wide in the left and right directions. Moreover, in the above reflector, the vertical part of the light emitting aperture end protrudes more toward the light emitting side than the left and right parts, so that of the direct light that passes directly from the coil filament through the light emitting aperture, the airport Since this protruding part reflects the light that passes through the vicinity of the light projection aperture end, which does not contribute to the light distribution of the marker light, the vertical direction within the desired light distribution range stipulated by ICAO can be achieved without increasing the lamp input to a high level. Light distribution can be improved.

Moreover, since the protruding part of the reflector toward the light emitting side is the part in the vertical direction of the light emitting aperture, the width of the reflector does not increase in the horizontal direction, so the entire end of the light emitting aperture of the reflector is simply The marker light will not be larger than if it were extended.

As is clear from the above, the airport marker light of the present invention has a special effect in that the illuminance distribution in both the vertical and horizontal directions is improved, and there is no need to make the entire marker light larger than necessary.

[Brief explanation of the drawing]

FIG. 1A is a cross-sectional view of a conventional airport marker light, FIG. 1B is a central cross-sectional view thereof, and FIG. 2A is a comparison of the horizontal illuminance distribution and the desired illuminance distribution of the conventional airport marker light. FIG. 2B is a similar diagram for the vertical illuminance distribution, FIG. 3A is a cross-sectional view of the main part of an embodiment of the present invention, FIG. Figure A is a plan view showing the overall configuration;
FIG. 5B is a longitudinal cross-sectional view thereof, FIG. The figure shows isoluminance curves corresponding to the required light distribution stipulated by ICAO. 11...Lamp, 12...Reflector, 12a...
Light projection aperture.

Claims (1)

[Scope of Claims] 1. A substantially cylindrical marker light body disposed on the road surface; a rotating secondary having a light projection opening and disposed to be able to project light from within the marker light body in a substantially horizontal direction; A reflector; has a coil filament in which a filament is wound into a flat coil shape so as to form a comprehensive pair of flat parts, and each flat part of the coil filament is located near the optical axis position of the reflector; a lamp disposed within the marker light body so as to face the left and right reflective surface portions of the reflector, respectively; An airport beacon light that is characterized by protruding toward the light emitting side.