JPS6124487B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to marking lights, for example, embedded road marking lights, in particular approach lights and runway end markings having light distribution characteristics up to the category specified by ICAO (International Civil Aviation Organization). Related to optical systems such as lights. [Prior Art] Conventionally, this type of marker light, for example, a road marker lamp for embedded use, which utilizes a reflecting mirror constituting an optical system, is known. As an example, consider a rotating parabolic mirror with a focal length of 17.5 mm and a filament length at its focal position.
The light distribution of a conventional lamp using a halogen bulb with a filament diameter of 12.3 mm and 2.5 mm has the light distribution characteristics shown in Figure 1. [Problems to be Solved by the Invention] As shown in Figure 1, conventional marker lights have significantly insufficient luminous intensity compared to the light distribution of the approach light center line light category specified by ICAO above. ing. The main reason for this is the size and shape of the reflector and the filament of the halogen bulb.
It is possible that the combination is not appropriate for the light distribution characteristics specified by ICAO. The present invention has been made in order to solve the problem of insufficient luminous intensity in view of the above-mentioned problems.Therefore, the reflector provided inside the lamp body and the light emitting part of the light source are each made into appropriate dimensions and shapes, and the dimensions and lamp wattage of the lamp are almost changed. To provide a marker light that can efficiently project light from a light source into a standard light distribution range through an aperture window without causing problems. [Means for Solving the Problems] The marker light of the present invention has an opening window in the lamp body, and inside thereof includes a light source, a reflector mounted opposite to the light source, and a reflector mounted near the opening window. The relationship between the size and shape of the light emitting part of the light source and the size and shape of the reflecting mirror is y ² =K・d・x ² +A・d・x where y is the radius of rotation of the reflector, x is the distance in the axial direction of the reflector (x=0 at the apex of the reflector, y=
0), d is the dimension of the light source emitting part in the y-axis direction (d
>0), K and A are constants determined by the shape. When K is −0.020 or less and −
0.065 or more, and A is 15 or more and 22 or less. [Operation] The relationship between the dimensions and shape of the reflecting mirror (x, y) of the optical system and the dimensions and shape of the filament d to be combined with it is as follows:
If it is expressed as y ² = K・d・x ² +A・d・x, then in an optical system that satisfies the ICAO standard light distribution for approach light center line lights, K is -0.038 to -0.059 and A is
In the range of less than 18.0, the closer K is to 0, the more concentrated the light distribution becomes. And if K is approximately -0.020 or less and -
A desired light distribution characteristic can be obtained by combining the dimensions and shapes of the reflecting mirror and the filament such that A is 0.065 or more and A is approximately 15 or more and 22 or less. Next, an embodiment of the present invention will be described with reference to FIGS. 2 to 6. In FIG. 2, reference numeral 1 denotes a marker light body having an opening window 2 on one side of its upper part, and is embedded in a road surface 3 such as a runway. Inside the lamp body 1, there are a halogen bulb 4 as a light source, a spheroidal reflector 5 as a reflecting mirror mounted operatively facing the halogen bulb 4, and a control panel mounted near the opening window 2. It has an optical system consisting of a prism 6 as a light body, and a filament 4a as a light emitting part of the halogen bulb 4 is attached so that the length direction of the filament 4a coincides with the central axis X of the reflecting mirror 5. It is being Further, the reflecting mirror 5 is formed in the shape of a spheroid with a portion cut out, and the reflecting surface 5a is a single reflecting surface of the spheroid and is mirror-finished by electrolytic polishing. Further, the filament 4a of the halogen light bulb 4 is of CC8 type. In such an optical system, even if the same reflecting mirror 5 is used, the obtained light distribution will be different because the dimensions and shapes of the filaments 4a are different. First, regarding the center line lamp of the approach light, in the optical system whose light distribution characteristics are shown in Fig. 3 through experiments, a reflecting mirror A made of an ellipsoid of revolution is used, and its primary focus position is a cylindrical shape with a length of 5.7 mm and a diameter of 5.7 mm. 15W with 4.3mm filament
I am using a halogen light bulb. In this case, the ICAO standard light distribution category for the approach light center line light,
However, when replacing bulb A with bulb B of the same wattage with a filament length of 11.2 mm and a diameter of 3.3 mm, the measured light distribution is as shown in Figure 4, which does not satisfy the standard light distribution. . This is because the filament diameter has decreased from 4.3 mm to 3.3 mm. In this case, the filament length starts from 5.7mm.
Being longer to 11.2mm is not a big plus in terms of light distribution. Next, Figure 5 shows the actually measured light distribution when a light bulb A with a filament diameter of 4.3 mm is used and the secondary focus of the spheroidal reflector is made longer than the embedded road reflector A and reflector B is used. 6 shows the actually measured light distribution when a reflecting mirror C having a longer secondary focal point than the reflecting mirror B is used. In the case of FIG. 6, in which the secondary focal point is the longest, the light is too concentrated and does not satisfy the standard light distribution. It can be seen from the light distribution data shown above that an appropriate combination exists in the relationship between the size and shape of the reflecting mirror 5 and the size and shape of the filament 4a. Now, the dimensions and shape of the reflecting mirror 5 and the filament 4a
The relationship between ^the dimensions and shape ^of x = 0, y = 0) at the vertex of
>0), K and A are constants determined by the shape. Based on the assumption expressed by , K and A in the combination of reflectors A, B, C and light bulbs A and B in the conventional lamp and the embodiment of the present invention are as shown in the table below.

〔Effect of the invention〕

According to the present invention, the size and shape of the reflector provided inside the lamp body and the size and shape of the light emitting part of the light source are set to appropriate size and shape that can satisfy the standard light distribution, so that the light source can be adjusted without changing the size of the lamp or the lamp wattage. can be efficiently projected within the standard light distribution range through a limited opening window. Further, light can be efficiently projected even if the reflecting surface of the reflecting mirror is a single reflecting surface of a rotating quadratic curved surface or a plurality of reflecting surfaces.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing actually measured light distribution by a conventional lamp, and FIG. 2 is a sectional view showing an embodiment of the marker light of the present invention.
Fig. 3 is a diagram showing the actually measured light distribution when the reflector A and bulb A are combined for the approach light center line lamp according to the embodiment of the present invention, and Fig. 4 is a diagram showing the measured light distribution when the reflector A and bulb B are combined. Figure 5 shows the measured light distribution when the above reflector B and light bulb A are combined, and Figure 6 shows the measured light distribution when the above reflector C and light bulb A are combined. Figure 7 is a diagram showing actually measured light distribution when a reflector C and light bulb A are combined for a runway end light according to another embodiment of the present invention;
FIG. 8 is a diagram showing the actually measured light distribution when the reflecting mirror D and light bulb A are combined. DESCRIPTION OF SYMBOLS 1...Lamp body, 2...Opening window, 4...Halogen bulb as a light source, 4a...Filament as a light emitting part, 5...Spheroidal reflecting mirror as a reflecting mirror, 5a
...reflective surface.

Claims (1)

[Scope of Claims] 1. The lamp body has an opening window, and has an optical system inside thereof consisting of a light source, a reflecting mirror mounted opposite to the light source, and a light control body mounted near the opening window. In a marker light, the relationship between the dimensions and shapes of the light emitting part of the light source and the reflector is as follows: y ² = K・d・x ² +A・d・x where y is the radius of rotation of the reflector and x is the radius of rotation of the reflector. Axial distance of the reflector (x=0, y=at the vertex of the reflector
0), d is the dimension of the light source emitting part in the y-axis direction (d
>0), where K and A are constants determined by the shape, K is -0.020 or less and -
0.065 or more, and A is 15 or more and 22 or less. 2. The marker lamp according to claim 1, wherein the reflecting surface of the reflecting mirror constituting the optical system is a single reflecting surface of a rotational quadratic curved surface. 3 The optical system is composed of a plurality of reflecting mirrors with different shapes for a single light source, and the relationship between the dimensions and shapes of each reflecting mirror and the dimensions and shapes of the light emitting part of the light source is y ₂ = K・d・x ₂ +A・d・x where −0.020≧K≧−0.065 and 22≧A≧15 are included in the range calculated, The marker lamp according to claim 1.