JP4666352B2 - Beacon light - Google Patents

Description

  The present invention relates to a marker lamp used in an airport taxiway and the like, and particularly to a technique for obtaining a prescribed light distribution performance with a simple structure.

  For ground-type beacon lights installed on airport taxiways and roads, the road surface around the beacon lights is brightly illuminated to indicate the width of the road and the position of the shoulder, and in other directions such as directly above and diagonally above. However, there are some which require a light distribution characteristic to irradiate a certain amount of light. For example, FIG. 9 shows a prescribed light distribution characteristic for a taxiway lamp installed on both sides of an airport taxiway or along the edge of an apron. When the vertical angle ranges from 0 degrees (horizontal) to 6 degrees, 6 10 times the luminous intensity is required compared with the range of 90 to 90 degrees.

  Conventionally, a halogen light bulb has been used as a light source, and the above light distribution characteristics have been realized by arranging a Fresnel lens so as to surround it. However, since a halogen bulb has a rated life of about 1000 hours and requires frequent replacement work and high power consumption, a marker lamp using a light emitting diode as a light source has been proposed.

  For example, there is a marker lamp in which a plurality of light emitting diodes are arranged so as to fill a circle to form a circular surface light source, and a funnel-type reflecting mirror having an opening in the center is arranged so as to face the circular light source ( Patent Document 1). This indicator lamp provides light distribution upward with a small number of light emitting diodes facing the central opening, and reflects the emitted light of the remaining many light emitting diodes in the horizontal direction with a reflecting mirror, thereby distributing the light as shown in FIG. Light characteristics are obtained.

  In the case of using a plurality of light emitting diodes, it is difficult to reduce the size of the lamp. For this reason, a single light emitting diode having light characteristics higher in the peripheral area surrounding the optical axis than that on the optical axis is used as the light source. There has been proposed a marker lamp in which a funnel-type reflecting mirror having a small opening in the center is arranged opposite to the above (see Patent Document 2). This beacon lamp provides light distribution on the upper side with light on the optical axis with low luminous intensity and reflects light with high luminous intensity around the optical axis in the horizontal direction with a reflecting mirror, thereby distributing the light as shown in FIG. Gaining characteristics.

JP 2000-173304 A Japanese Patent Laid-Open No. 2004-300797

  A general surface-emitting light emitting diode has a mountain-shaped light characteristic having a peak on the optical axis. However, in the above-described marker lamp, the luminous intensity of the peripheral region surrounding the optical axis is higher than that on the optical axis. Special light emitting diodes with high light characteristics are required. For this reason, there is a concern about the stable supply of the light emitting diode as a light source, and there is a problem in that the cost of parts increases.

  The present invention is intended to solve the above-described problems, and an object of the present invention is to provide a marker lamp that can realize a prescribed light distribution characteristic by using one light source having a general light characteristic.

  The above object can be achieved by the following inventions.

The marker lamp according to the invention of claim 1 comprises a light source (13),
A reflecting member (14a, 41a, 41c) that mainly reflects light emitted by the light source (13) in a predetermined angle range centered on the optical axis to the outside perpendicular to the optical axis;
Light the light source (13) is radiated outside from the predetermined angular range, the refractive members (14b, 41d) to refract into the optical axis side and have a,
The refracting members (14b, 21) are arranged so as to avoid an optical path of light emitted from the light source (13) and reflected by the reflecting member (14a) .

According to the above invention, light in a predetermined angle range (for example, ± 60 degrees) centered on the optical axis among the light emitted from the light source (13) is reflected by the reflecting member (14a, 41a, 41c) and is optical axis. Irradiated in a direction orthogonal to On the other hand, the light emitted outside the predetermined angle range is refracted toward the optical axis by the refractive members (14b, 21, 41d), and irradiates around the optical axis. That is, if a general surface-emitting light emitting diode having a peak-like light characteristic with a peak on the optical axis is used, light near the optical axis with high luminous intensity is irradiated in a direction perpendicular to the optical axis, Since light in a low luminous intensity region away from the optical axis irradiates the periphery of the optical axis, the light distribution characteristic as shown in FIG. 9 is realized by utilizing the light characteristic of a general light source as it is. . Moreover, the light reflected by the reflecting member (14a) is irradiated to the outside perpendicular to the optical axis without being disturbed by the refracting members (14b, 21).

In the marker lamp according to the second aspect of the present invention, the reflecting member (14a) is a reflecting surface having a conical outer slope shape whose tip is opposed to the light source (13) on the optical axis,
The refracting members (14b, 21) are composed of prisms arranged around the reflecting member (14a).

In the marker lamp according to the third aspect of the present invention, the light source (13) is composed of one light emitting diode having a light characteristic in which the amount of light attenuates as the radiation angle departs from the optical axis.

In the marker lamp according to the invention described in claim 4 , the reflecting member (14a, 41a, 41c) and the bending member (14b, 41d) are provided only in a part of the direction around the optical axis.

  For example, it is applied to a marker lamp different from the omnidirectional type, such as irradiating light only in one direction or two directions.

  According to the marker lamp according to the present invention, a general light emitting diode having a peak-shaped light characteristic having a peak on the optical axis is used as a light source, and it shines weakly within a predetermined angle range from the optical axis and is orthogonal to the optical axis. It is possible to realize a marker lamp having a light distribution characteristic that shines strongly in the direction in which the light is emitted.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an end face obtained by cutting the center of a marker lamp 10 according to an embodiment of the present invention in a vertical direction. The marker lamp 10 is an omnidirectional type marker lamp that is installed on both sides of a taxiway at an airport and fulfills the function of displaying the position and width of the road shoulder to an aircraft operator. The marker lamp 10 surrounds the front and periphery of the light emitting diode 13, a main body case 11 installed on the ground, a mounting base 12 attached to the main body case 11, a light emitting diode 13 attached to the center of the mounting base 12. The reflector unit 14 includes a glass globe 15 attached to the upper surface of the main body case 11 so as to accommodate the mount 12 and the reflector unit 14.

  More specifically, the main body case 11 has a cylindrical shape with an upper part spread, and is formed of an aluminum alloy or the like. The glass globe 15 covering the main body case 11 has a transparent and hollow substantially hemispherical shape. The light emitting diode 13 is a surface light emitting blue light emitting diode. Moreover, it is a power type which can flow a large current. As shown in FIG. 2, the light emitting diode 13 has a mountain-shaped optical characteristic having a peak on the optical axis. Here, a half value of 60 degrees is used.

  The reflecting mirror unit 14 has a short hollow cylindrical shape having a ceiling portion. The ceiling portion of the reflecting mirror unit 14 is configured to form a reflecting portion 14a as a reflecting member and a prism portion 14b as a refracting member. The reflecting portion 14 a is a reflecting surface having a substantially conical slope shape whose tip is opposed to the light emitting diode 13. Each part of the reflecting surface forms a slope that is inclined so as to be closer to the light emitting diode 13 as it approaches the optical axis. The prism portion 14b is an annular prism disposed around the reflecting portion 14a.

  The reflecting mirror unit 14 is integrally formed of a transparent resin as a whole, and is manufactured by molding, for example. Moreover, aluminum vapor deposition is given to the surface which faces the light emitting diode 13 of the reflection part 14a. Thereby, a mirror reflection surface is formed. In addition, since the light transmission part is not provided in the center of the reflection part 14a, the operation | work which masks the center of the reflection part 14a before performing aluminum vapor deposition is unnecessary. Moreover, the aluminum vapor deposition process needs only once.

  Next, the operation of the reflecting mirror unit 14 will be described.

  As shown in FIG. 1, the light P1 radiated within a predetermined angle range (± 60 degrees in this case) centered on the optical axis A is reflected by the reflecting portion 14a and then outwards perpendicular to the optical axis A. proceed. As shown in the optical characteristics of FIG. 2, the light emitted by the light emitting diode 13 in a predetermined angle range centered on the optical axis has a higher luminous intensity than the light emitted outside the predetermined angle range. The direction orthogonal to the optical axis A is illuminated brightly over the entire circumference.

  On the other hand, the light P2 emitted by the light emitting diode 13 outside the predetermined angle range reaching the reflecting portion 14a is incident on the prism portion 14b disposed around the reflecting portion 14a, and is refracted toward the optical axis A side to be refracted to the prism portion. 14b.

  The light P3 emitted from the light emitting diode 13 further outside the range reaching the prism portion 14b is transmitted through the cylindrical peripheral wall portion 14c of the reflecting mirror unit 14 at an angle parallel to the incident time and is emitted to the outside.

  As shown by the optical characteristics in FIG. 2, the light emitted from the light emitting diode 13 decreases in intensity as the radiation angle is further away from the optical axis A. Therefore, the light P2 transmitted through the prism portion 14b and the cylindrical peripheral wall of the reflector unit 14 The light P3 that is directly incident and transmitted from the light emitting diode 13 to the portion 14c has a lower luminous intensity than the light P1 reflected by the reflecting portion 14a, and the marker lamp 10 illuminates the upper side weakly. Thereby, the marker lamp 10 realizes the light distribution characteristic as shown in FIG. 9 by utilizing the general light characteristic of the light emitting diode 13 as it is.

  FIG. 3 shows the optical path of the light from the light emitting diode 13 incident on the reflecting mirror unit 14 in more detail. The reflecting surface of the reflecting portion 14a is slightly curved, and the light reflected by the reflecting portion 14a is set to diffuse and radiate from the direction orthogonal to the optical axis A to the optical axis side in a range of 6 degrees. It is. In addition, the light emitted from the prism portion 14b is set to diffuse over a wide angular range by curving the shape of the emission surface of the prism portion 14b.

  The prism portion 14b is arranged so as to avoid the optical path of the light P1 emitted from the light emitting diode 13 and reflected by the reflecting portion 14a. In other words, the incident surface side of the prism portion 14b is formed to be a surface perpendicular to the optical axis, and the prism portion 14b is formed to be convex to the outside of the reflecting mirror unit 14. As a result, the light reflected by the reflecting portion 14a is not blocked by the prism portion 14b or refracted by the prism portion 14b, so that the light P1 is efficiently emitted outwardly perpendicular to the optical axis A. In addition, as long as it does not advance on the optical path of the light P1 reflected by the reflection part 14a, as shown in FIG. 4, it may be a prism part 21 having such a shape that the surface on the emission side is perpendicular to the optical axis. .

  In addition, since the blue light emitting diode 13 is used and the glass globe 15 is made transparent, the light transmittance in the glass globe 15 is higher than that in the case where the glass globe 15 is colored and transparent in blue. Light is efficiently emitted from the lamp 10.

  FIG. 5 shows a central vertical end face of the marker lamp 30 according to a modification of the first embodiment. The reflection unit 31 in the marker lamp 30 has a shape that is flattened by removing the depression on the upper surface of the reflector unit 14 shown in FIG. The reflecting unit 31 includes a reflecting portion 14a and a prism portion 14b similar to the reflecting mirror unit 14 of FIG. Since it is possible to prevent rainwater from collecting by flattening the upper surface of the reflection unit 31 in this way, the glass globe 15 is eliminated and the reflection unit 31 is used as an outer cover of the marker lamp 30 as it is. The upper surface of the reflection unit 31 may be formed slightly convex.

Next, a reference example of the present invention will be described.

FIG. 6 shows an end face obtained by cutting the center of the marker lamp 40 according to the reference example in the vertical direction. The marker lamp 40 includes a transparent body 41 that covers the light emitting diode 13 instead of the reflecting mirror unit 14 of the marker lamp 10 shown in FIG. Other parts are the same as those of the marker lamp 10 of FIG. 1, and the same reference numerals as those of FIG.

  The transparent body 41 is made of a transparent material having a higher density than the outside. For example, it is manufactured by molding a transparent resin. The transparent body 41 has a substantially conical depression 41 a whose tip is opposed to the light emitting diode 13 on the upper end surface of a short cylinder having an axis in the same direction as the optical axis of the light emitting diode 13. Each portion of the boundary surface 41c with the outside in the hollow portion 41a forms a slope that is inclined so as to be closer to the light emitting diode 13 as it approaches the optical axis. An incident portion 41 b that is recessed in a hemispherical shape along the outer shape of the light emitting diode 13 is formed at a portion facing the light emitting diode 13 at the lower center of the transparent body 41.

  FIG. 7 shows an optical path of light from the light emitting diode 13 that has entered the transparent body 41. The light emitted from the light emitting diode 13 is incident on the inside of the transparent body 41 without being refracted on the incident surface because the incident portion 41b has a hemispherical concave shape.

  Of the light incident on the incident portion 41b from the light emitting diode 13, most of the light reaching the boundary surface 41c between the depression 41a and the outside is totally reflected by the boundary surface 41c and goes outward perpendicular to the optical axis A. proceed. That is, since the density of the inside of the transparent body 41 is higher than that of the outside, the light is incident from dense to sparse, and total reflection occurs according to the incident angle. Further, part of the light reaching the boundary surface 41c is leaked light (light indicated by a broken line in FIG. 7) that is transmitted to the outside without being totally reflected. As described above, the transparent body 41 and the depression 41a serve as a reflecting member that mainly reflects light emitted from the light emitting diode 13 in a predetermined angle range centered on the optical axis A to the outside perpendicular to the optical axis A. Plays the function.

  In order to create leaked light that is not totally reflected, the theoretical design is such that the boundary surface 41c of the dent 41 forming the reflective surface is given a fine roughness, or the total reflection is 90% and the leaked light is 10% at the critical angle. It is realized by doing.

  Since the light totally reflected by the boundary surface 41c of the depression 41a travels in a direction substantially orthogonal to the optical axis A, it enters the peripheral surface 41d of the transparent body 41 at a substantially right angle. Thereby, the light totally reflected by the boundary surface 41c with the outside in the hollow portion 41a is emitted to the outside without being refracted by the peripheral surface 41d.

  On the other hand, light emitted from the light emitting diode 13 at an angle far away from the optical axis A (light indicated by a dashed line in FIG. 7) travels straight inside the transparent body 41 and directly enters the peripheral surface 41 d of the transparent body 41. . This is incident from dense to sparse and incident at less than a critical angle, so that it is refracted toward the optical axis A when transmitted from the peripheral surface of the transparent body 41 to the outside. That is, the peripheral surface 41d of the cylindrical portion in the transparent body 41 functions as a refracting member that refracts the light emitted from the light emitting diode 13 outside the predetermined angle range toward the optical axis A side.

  Also in the marker lamp 40 using the transparent body 41, the light having a high luminous intensity emitted from the light emitting diode 13 in a predetermined angle range centered on the optical axis A is orthogonal to the optical axis A by the boundary surface 41c of the recess 41. Since it is totally reflected outward, the entire circumference in the direction orthogonal to the optical axis A is illuminated brightly. On the other hand, the upper part of the marker lamp 10 is weakly illuminated by leakage light from the boundary surface 41 c of the recess 41 or light having a relatively low intensity refracted by the peripheral surface 41 d of the transparent body 41. As a result, the marker lamp 40 realizes the light distribution characteristic as shown in FIG. 9 by utilizing the general light characteristic of the light emitting diode 13 as it is.

  Since the transparent body 41 uses total reflection, it is not necessary to form a reflecting surface by aluminum vapor deposition or the like, and there is an advantage that manufacture is easy.

  FIG. 8 shows a marker lamp 50 of the type without the glass globe 15. The marker lamp 50 is configured such that the upper surface has a convex shape by filling the recess 41a of the transparent body 41 with a lid member 42 made of a transparent material having a density lower than that of the transparent body 41, and the recess 41a. Rain water is prevented from accumulating. In addition, by making the upper surface convex, the light transmitted through the boundary surface 41c of the depression 41a is incident on the boundary surface at a substantially right angle when emitted from the lid member 42 to the outside. The lid member 42 is made of a material having a density lower than that of the transparent body 41 so that total reflection does not occur when the transparent member 41 enters the lid member 42. The lid member 42 is made of a material that is denser than the outside. For example, the transparent body 41 may be made of resin and the lid member 42 may be made of glass, or these may be made of transparent resins having different densities.

As mentioned above, although embodiment of this invention has been described based on drawing, a concrete structure is not restricted to what was shown in embodiment, The change and addition in the range which do not deviate from the summary of this invention are carried out. Even if it exists, it is included in this invention.

  For example, one light-emitting diode 13 is used as the light source, but other types of light sources may be used as long as they have the same optical characteristics as in FIG. Further, the reflecting mirror unit 14 and the like are manufactured by molding, but other manufacturing methods such as cutting may be used. The reflecting mirror units 14 and 31 are not limited to resin, and may be made of a transparent member such as glass.

  In the reflecting mirror unit 14, the reflecting portion 14a and the prism portion 14b may be formed, and the cylindrical peripheral wall portion 14c of the reflecting mirror unit 14 exists to support these, and the reflecting portion 14a and the prism portion 14b. Is attached to the glass globe 15 side, for example, the cylindrical peripheral wall portion 14c of the reflector unit 14 may be omitted. Moreover, although the reflection part 14a and the prism part 14b were comprised integrally, you may comprise these by another component.

  Further, instead of flatly forming the upper surface of the reflecting mirror unit 31 itself as shown in FIG. 5, a cover that covers the depression may be separately attached to the upper surface of the reflecting mirror unit 14 of FIG. If this lid is made opaque, the reflecting mirror unit and the light emitting diode can be prevented from being tanned.

  In the embodiment, the reflecting surface of the reflecting member and the incident surface and the emitting surface of the prism portion are formed as continuous curved surfaces. However, the flat surfaces may be combined stepwise.

  The sign lamp according to the present invention is not limited to use as an aircraft light such as an airport taxiway light, but also as a helicopter light, an aviation obstacle light, a ship light, a traffic sign light such as an embedded fence or a line-of-sight guide, a landscape illumination light Applicable. Moreover, it is applicable not only to an omnidirectional type but to a one-way type, a two-way type, or the like. In this case, the reflecting member and the refracting member may be provided only in the direction where irradiation is necessary around the optical axis.

It is a center longitudinal end view which shows the marker lamp concerning embodiment of this invention . It is explanatory drawing which shows the optical characteristic of the light emitting diode used with the marker lamp concerning embodiment of this invention . It is explanatory drawing which shows the optical path of the light from the light emitting diode which injects into a reflective mirror unit. It is a fragmentary end view which shows the other shape of a prism part. It is a center longitudinal end view which shows the type which lost the glass globe as a modification of the marker lamp concerning embodiment of this invention . It is a center longitudinal end view which shows the marker lamp concerning the reference example of this invention. It is explanatory drawing which shows the optical path of the light from the light emitting diode which injected into the transparent body. It is a center longitudinal end view which shows the type which lost the glass globe as a modification of the marker lamp concerning the reference example of this invention. It is explanatory drawing which shows the regular light distribution characteristic with respect to a taxiway lamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS A ... Optical axis of light emitting diode 10 ... Indicator light 11 ... Main body case 12 ... Mounting base 13 ... Light emitting diode 14 ... Reflector unit 14a ... Reflecting part 14b ... Prism part 14c ... Cylindrical peripheral wall part 15 ... Glass globe 21 ... Prism part 30 ... Signal lamp 31 ... Reflective mirror unit 40 ... Signal lamp 41 ... Transparent body 41a ... Depression part 41b ... Injection part 41c ... Boundary surface 41d ... Surrounding surface 42 ... Cover member 50 ... Signal lamp

Claims (4)

A light source;
A reflection member that mainly reflects light emitted by the light source in a predetermined angle range centered on the optical axis to the outside perpendicular to the optical axis;
Light the light source is emitted outward from the predetermined angular range, it has a refractive member that refracts to the optical axis side,
A marker lamp characterized in that the refractive member is disposed avoiding an optical path of light emitted from the light source and reflected by the reflecting member . The reflecting member is a reflecting surface having an outer slope shape of a cone with a tip facing the light source on the optical axis,
The marker lamp according to claim 1, wherein the refractive member is a prism disposed around the reflecting member. 3. The marker lamp according to claim 1, wherein the light source is one light-emitting diode having a light characteristic in which a light amount is attenuated as a radiation angle is separated from an optical axis thereof. The marker lamp according to any one of claims 1, 2, and 3, wherein the reflecting member and the bending member are provided only in a part of the direction around the optical axis.

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