Aircraft warning light

Abstract

To provide an aircraft warning light that radiates light within an appropriate range.SOLUTION: An aircraft warning light 10 comprises: gutter-shaped reflection mirrors 211 and 212 arranged with a longitudinal direction thereof horizontal; a light-transmitting window 45 positioned opposite the reflection mirrors 211 and 212; a plurality of light emitting diodes (LEDs) arranged parallel to the longitudinal direction of the reflection mirrors 211 and 212, and positioned between the reflection mirrors 211 and 212 and the light-transmitting window 45; two first shielding plates 31 positioned closer to the light-transmitting window than the LEDs; and two second shielding plates 32 arranged by sandwiching the two first shielding plates 31.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an aviation obstruction light.

Background Art

[0002] In principle, aviation obstruction lights are installed on structures such as towers, chimneys, bridges, and high-rise buildings with a ground height of 60 meters or more. According to the Enforcement Regulations of the Aviation Law, four types of aviation obstruction lights are defined: high-intensity aviation obstruction lights, medium-intensity white aviation obstruction lights, medium-intensity red aviation obstruction lights, and low-intensity aviation obstruction lights. For each type of aviation obstruction light, the illuminance, the radiation range of light, the installation location, etc. are defined.

[0003] An aviation obstruction light has been proposed in which a circuit board with a large number of LEDs (light-emitting diodes) arranged on the upper surface, a reflector in a rotating body shape with a thick central part and tapered thinner up and down, and a circuit board with a large number of LEDs arranged on the lower surface are stacked in order from below (Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The aviation obstruction light of Patent Document 1 can realize a bright aviation obstruction light by arranging a large number of LEDs on each circuit board. However, a part of the light radiated from the LEDs is radiated to the outside without being reflected by the reflector, and bright light is radiated in an unnecessary direction.

[0006] On one aspect, an object is to provide an aviation obstruction light that radiates light within an appropriate range.

Means for Solving the Problems

[0007] The aviation obstruction light includes a gutter-shaped reflector arranged horizontally in the longitudinal direction, a light transmission window facing the reflector, a plurality of LEDs arranged between the reflector and the light transmission window and arranged in parallel with the longitudinal direction of the reflector, two first light shielding plates arranged closer to the light transmission window than the LEDs, and two second light shielding plates arranged sandwiching the two first light shielding plates.

Advantages of the Invention

[0008] On one side, it is possible to provide an aviation obstruction light that emits light within an appropriate range.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0010] (1) The aviation obstruction light according to an embodiment of the present invention is A gutter-shaped mirror arranged horizontally in the longitudinal direction, A light transmission window facing the mirror, A plurality of LEDs arranged between the mirror and the light transmission window and arranged in parallel in the longitudinal direction of the mirror, Two first light shielding plates arranged closer to the light transmission window than the LEDs, Two second light shielding plates arranged sandwiching the two first light shielding plates are provided.

[0011] According to the aviation obstruction light according to an embodiment of the present invention, an aviation obstruction light that radiates light in an appropriate range can be provided.

[0012] (2) In the aviation obstruction light according to (1) above, The second light shielding plate, A parallel plate portion parallel to the first light shielding plate, and an inclined plate portion continuous with the edge of the parallel plate portion and inclined with respect to the parallel plate portion may be provided.

[0013] According to the aviation obstruction light according to (2) above, an aviation obstruction light that prevents light from being radiated in an inappropriate direction can be provided.

[0014] (3) In the aviation obstruction light according to (2) above, The parallel plate portions of the two second light shielding plates are parallel to each other, and the inclined plate portions of the two second light shielding plates may be parallel to each other.

[0015] According to the aviation obstruction light according to (3) above, an aviation obstruction light that prevents light from being radiated in an inappropriate direction can be provided.

[0016] (4) In the aviation obstruction light according to (2) or (3) above, The parallel plate portion is arranged horizontally, The vertical distance between the parallel plate portion of the upper second light-shielding plate and the upper end of the reflecting mirror among the two second light-shielding plates may be shorter than the vertical distance between the parallel plate portion of the lower second light-shielding plate and the lower end of the reflecting mirror.

[0017] According to the aviation obstruction light described in (4) above, an aviation obstruction light can be provided in which the light radiated upward is stronger than the light radiated downward.

[0018] (5) In the aviation obstruction light according to any one of (1) to (4) above, the first light-shielding plate is a long plate arranged with its longitudinal direction horizontal, the horizontal length of the first light-shielding plate is longer than the array length of the LEDs, the horizontal length of the second light-shielding plate may be shorter than the array length of the LEDs.

[0019] According to the aviation obstruction light described in (5) above, an aviation obstruction light that prevents the radiation of unnecessary light in the vertical direction can be provided.

[0020] (6) In the aviation obstruction light according to any one of (1) to (5) above, the first light-shielding plate is a long plate arranged with its longitudinal direction horizontal, the horizontal length of the reflecting mirror is longer than the array length of the LEDs, the horizontal length of the first light-shielding plate may be longer than the horizontal length of the reflecting mirror.

[0021] According to the aviation obstruction light described in (6) above, an aviation obstruction light that spreads the reflected light in the horizontal direction can be provided.

[0022] (7) In the aviation obstruction light according to any one of (1) to (6) above, the reflecting mirror is divided into a first reflecting mirror located above and a second reflecting mirror located below with a horizontally arranged divided body therebetween, the LEDs are first LEDs arranged above the divided body, It may also include a second LED arranged below the divided body.

[0023] According to the aviation obstruction light described in the above (7), an aviation obstruction light with a large light quantity can be provided.

[0024] (8) In the aviation obstruction light described in the above (7), The first LED may be blocked by the first light shielding plate located above the divided body and may not be visible from outside the light transmission window.

[0025] According to the aviation obstruction light described in the above (8), an aviation obstruction light that prevents the emission of unnecessary light into the sky can be provided.

[0026] (9) In the aviation obstruction light described in any one of the above (1) to (8), The first light shielding plate may be arranged horizontally.

[0027] According to the aviation obstruction light described in the above (9), an aviation obstruction light that efficiently emits light forward can be provided.

[0028] An aviation obstruction light has been proposed in which a circuit board with a large number of LEDs arranged on the upper surface, a reflector in the shape of a rotating body with a thick central part and tapered and thin in the vertical direction, and a board with a large number of LEDs arranged on the lower surface are laminated in order from below (Patent Document 1). Such an aviation obstruction light has the advantage that it can emit light in all directions horizontally with a single unit.

[0029] However, in the aviation obstruction light of Patent Document 1, the luminous intensity of the light emitted in each direction is low. Therefore, it is difficult to realize a high-luminance aviation obstruction light that requires a high luminous intensity with the configuration of the aviation obstruction light disclosed in Patent Document 1.

[0030] Conventionally, xenon tubes have mainly been used as the light sources of high-intensity aviation obstruction lights. A xenon tube emits light in all directions of the tube. Therefore, by arranging a single gutter-shaped reflector behind the horizontally arranged xenon tube, the light emitted from the xenon tube could be efficiently radiated forward of the xenon tube.

[0031] By using high-brightness LEDs, which have a longer lifespan compared to xenon tubes, as the light sources of aviation obstruction lights, the replacement cycle of the light sources can be extended, and the maintenance cost of the aviation obstruction lights can be reduced. However, LEDs need to be mounted on a circuit board for use. Since the circuit board is generally opaque, no light is radiated from the back surface of the circuit board.

[0032] However, if a conventional xenon tube is simply replaced with LEDs mounted on a plurality of circuit boards, most of the light reflected by the gutter-shaped reflector will be blocked by the opaque circuit boards. Therefore, a high-intensity aviation obstruction light with sufficient luminous intensity cannot be realized. Furthermore, the energy of the light blocked by the circuit board is converted into heat, and the LEDs themselves generate heat, making the LEDs prone to overheating. Since LEDs are likely to have a shorter lifespan due to overheating, the advantage of LEDs having a long lifespan is lost.

[0033] To avoid such drawbacks associated with using an opaque circuit board, it is conceivable to arrange the circuit board obliquely with respect to the central axis of the gutter-shaped reflector. However, if a part of the light emitted from the high-brightness LEDs is radiated outside the aviation obstruction light without being reflected by the gutter-shaped reflector, bright light will be radiated in an unnecessary direction.

[0034] In the following, specific examples of aviation obstruction lights that shield the light going in an unnecessary direction and do not radiate it outside the aviation obstruction light will be described.

[0035] [Embodiment 1] FIG. 1 is a perspective view of an aviation obstruction light 10. In the following description, the respective directions of front, rear, left, right, up, and down indicated by arrows in each figure are used. These directions indicate the directions when the aviation obstruction light 10 is attached to a structure.

[0036] The aviation obstruction light 10 of this embodiment is a high-intensity aviation obstruction light that emits white flashes. According to the Enforcement Regulations of the Aviation Law, for high-intensity aviation obstruction lights used in places with high background luminance, the effective luminous intensity is specified to emit light with a luminous intensity of 150,000 candela or more and 250,000 candela or less on the horizontal plane, 75,000 candela or more and 112,500 candela or less at 1 degree below the horizontal plane, and 7,500 candela or less at 10 degrees below the horizontal plane.

[0037] That is, for high-intensity aviation obstruction lights, it is legally required to suppress the light radiated below the horizontal plane to a luminous intensity of 1 / 20 or less of the light radiated on the horizontal plane while radiating high-intensity light on the horizontal plane.

[0038] Note that the aviation obstruction light 10 may also be a medium-intensity white aviation obstruction light. According to the Enforcement Regulations of the Aviation Law, the medium-intensity white aviation obstruction light has the same specifications as the high-intensity aviation obstruction light, except that the effective luminous intensity in the case of high background luminance is defined to be lower than that of the high-intensity aviation obstruction light.

[0039] Although not a legal requirement, it is not desirable to radiate unnecessarily high-intensity light above the horizontal plane as it is a waste of energy. When the angle of radiating light with the luminous intensity specified by the Enforcement Regulations of the Aviation Law in the horizontal direction is narrow, it is necessary to increase the number of aviation obstruction lights 10 installed at the same height, which is also not desirable.

[0040] Therefore, in addition to the provisions of the above-mentioned Enforcement Regulations of the Aviation Law, additional conditions are defined in the specification and the like. The aviation obstruction light 10 of this embodiment radiates light with a vertical beam angle of 3 degrees or more and 7 degrees or less and a horizontal beam angle of 120 degrees or more and 180 degrees or less, in addition to the conditions of the above-mentioned Enforcement Regulations of the Aviation Law. Here, the beam angle means the angle in the range where the luminous intensity is 50% or more of the maximum value.

[0041] As is apparent from the above description, the aviation obstruction light 10 of the present embodiment blinks a white flash that is thin in the vertical direction and spreads in the horizontal direction. Regarding the cable for supplying power, control signals, etc. to the aviation obstruction light 10, illustration thereof is omitted. The power, control signals, etc. may be supplied wirelessly.

[0042] As shown in FIG. 1, the aviation obstruction light 10 includes a housing 89, a light-transmitting window 45, a frame 46, an upper reflector 49, a drain pipe 85, and a heat sink 86. The housing 89 is a rectangular box-shaped with the bottom surface facing the rear side, the long side in the left-right direction, and the short side in the up-down direction. The light-transmitting window 45 is a light-transmissive flat plate. The frame 46 is a rectangular frame that holds the periphery of the light-transmitting window 45 in a watertight manner.

[0043] The frame 46 is watertightly fixed to the opening of the housing 89 by a plurality of bolts or the like. Since packing or the like for realizing watertightness has been conventionally used, illustration and description thereof are omitted. The light-transmitting window 45, the frame 46, and the housing 89 form a substantially rectangular parallelepiped.

[0044] The heat sink 86 is arranged on the back surface of the housing 89. Mounting portions 88 are arranged on the left and right of the back surface of the housing 89. The aviation obstruction light 10 is attached to a structure via the mounting portions 88. Note that the shape of the mounting portions 88 shown in the figure is an example. Mounting portions 88 having a shape corresponding to the structure to which the aviation obstruction light 10 is attached are appropriately used.

[0045] FIG. 2 is a right side view of the aviation obstruction light 10. The drain pipe 85 is attached to the lower surface of the housing 89. Water generated inside the housing 89 due to condensation or the like is discharged outside the aviation obstruction light 10 through the drain pipe 85. Since the drain pipe 85 is a thin pipe with the opening facing downward, the possibility of rainwater or the like entering the housing 89 through the drain pipe 85 is low, and even if it enters, it is discharged through the drain pipe 85.

[0046] Along the lower side of the light transmission window 45, a rectangular plate-shaped upper reflector 49 is arranged. By the upper surface of the upper reflector 49, part of the light transmitted obliquely downward through the light transmission window 45 is diffusely reflected upward. Due to this reflected light, the presence of the aviation obstruction light 10 can be visually recognized from an aircraft in the sky.

[0047] FIG. 3 is a longitudinal sectional view of the aviation obstruction light 10. FIG. 3 shows a cross section in a state where the frame 46 is removed from the aviation obstruction light 10. The light transmission window 45 is indicated by a two-dot chain line. Inside the housing 89, a first reflector 211, a second reflector 212, two lighting substrates 23, a light shield 30, and a support 50 are accommodated. A rectangular opening is provided in the bottom surface of the housing 89.

[0048] The support 50 has a support plate 51, a divided body 52, and a shape support 53. Details of the shape of the support 50 will be described later. The rear end portion of the support plate 51 has substantially the same shape as the rectangular opening provided in the bottom surface of the housing 89, and the back surface of the support plate 51 is arranged on substantially the same plane as the back surface of the housing 89. That is, the back surface of the support plate 51 is exposed from the housing 89.

[0049] The first reflector 211, the second reflector 212, the lighting substrate 23, and the light shield 30 are supported by the support 50. Specifically, the first reflector 211 and the second reflector 212 are supported by the shape support 53. The lighting substrate 23 and the light shield 30 are supported by the divided body 52.

[0050] On the upper lighting substrate 23, a first LED 221 (see FIG. 5) is mounted. On the lower lighting substrate 23, a second LED 222 (see FIG. 5) is mounted. The first LED 221 and the second LED 222 are connected so as to be lit and extinguished simultaneously.

[0051] FIG. 4 is a perspective view of the aviation obstruction light 10 with the housing 89, the heat sink 86, and the mounting portion 88 removed from FIG. 3. FIG. 5 is a view seen in the direction of arrow V in FIG. 4. FIG. 6 is a perspective view of the aviation obstruction light 10 with the light shield 30 removed from FIG. 4. FIG. 7 is an enlarged view of part VII in FIG. 6.

[0052] As shown in FIGS. 4 to 6, the first mirror 211 and the second mirror 212 are gutter-shaped concave mirrors arranged with their longitudinal directions horizontal. The first mirror 211 and the second mirror 212 have substantially the same shape. The second mirror 212 is disposed below the first mirror 211 with its top and bottom reversed from that of the first mirror 211.

[0053] The first mirror 211 and the second mirror 212 are arranged with their concave mirror surfaces facing forward. The first mirror 211 and the second mirror 212 form a gutter-shaped concave mirror, the mirror 21. That is, the mirror 21 is divided into the first mirror 211 and the second mirror 212 by a divided body 52 that forms part of the support 50.

[0054] In front of the first mirror 211, an illumination substrate 23, which is a circuit board, is disposed. As shown in FIG. 7, a plurality of first LEDs 221 are mounted in a row on the surface of the illumination substrate 23 facing the first mirror 211. As shown in FIG. 5, the first LEDs 221 are disposed between the first mirror 211 and the light transmission window 45. The arrangement direction of the plurality of first LEDs 221 is parallel to the longitudinal direction of the first mirror 211.

[0055] Similarly, the illumination substrate 23 is also disposed in front of the second mirror 212. A plurality of second LEDs 222 are mounted on the surface of the illumination substrate 23 facing the second LEDs 222. That is, the second LEDs 222 are disposed between the second mirror 212 and the light transmission window 45. The arrangement direction of the second LEDs 222 is parallel to the longitudinal direction of the second mirror 212.

[0056] Details of the shapes of the first mirror 211 and the second mirror 212, as well as the structure for maintaining the shapes, will be described later. Similarly, the positions of the first LEDs 221 and the second LEDs 222, as well as the structure for holding the two illumination substrates 23, will also be described later. In the following description, when there is no need to distinguish between the first LEDs 221 and the second LEDs 222, they may simply be referred to as LEDs 22 (see FIG. 10).

[0057] Returning to FIGS. 4 and 5, the description will be continued. The light shield 30 is disposed between the first mirror 211 and the second mirror 212 and the light transmission window 45. The light shield 30 includes a light shield support 34, two first light shield plates 31 disposed above and below the light shield support 34, and two second light shield plates 32 disposed above and below the first light shield plates 31.

[0058] A gap is provided between the light shield support 34 and the first light shield plate 31, between the first light shield plate 31 and the second light shield plate 32, and between the second light shield plate 32 and the edge of the light transmission window 45. Details of the structure of the light shield 30 will be described later.

[0059] The light emitted from the first LED 221 is reflected by the first mirror 211 and then passes through the upper half gap of the light shield 30 or above the second light shield plate 32 and then passes through the light transmission window 45. The light emitted from the second LED 222 is reflected by the second mirror 212 and then passes through the lower half gap of the light shield 30 or below the second light shield plate 32 and then passes through the light transmission window 45.

[0060] FIG. 8 is a perspective view of the support 50. As described above, the support 50 includes a support plate 51, a divided body 52, and a shape support 53. The support plate 51 is in the shape of a substantially rectangular plate disposed with its longitudinal direction horizontal and its short direction vertical. The back surface of the support plate 51 is flat and in close contact with the heat sink 86. As shown in FIG. 3, the back surface of the support plate 51 is disposed substantially parallel to the light transmission window 45.

[0061] The divided body 52 projects forward from the central portion of the front surface of the support plate 51. The divided body 52 is in the shape of a substantially isosceles triangular column with its apex facing the support plate 51 side, and the front surface corresponding to the base of the isosceles triangle is a rectangle substantially parallel to the back surface of the support plate 51. The length of the divided body 52 in the left-right direction is shorter than the length of the support plate 51 in the left-right direction.

[0062] From the front surface of the support plate 51, five shape supports 53 each project obliquely upward and forward and obliquely downward and forward at substantially equal intervals. The shape support 53 is a plate-like member bent into the shape of a portion of a parabola that does not include the axis of symmetry. The end portion of the shape support 53 on the side farther from the axis of symmetry is bent in a direction away from the axis of symmetry of the parabola. The five upper shape supports 53 are substantially identical in shape. The five lower shape supports 53 are also substantially identical in shape. The shape support 53 is sandwiched between the focus of the parabola forming the shape support 53 and the support plate 51.

[0063] Note that the number of the shape supports 53 may be four or less or six or more respectively in the vertical direction. For example, instead of the five upper shape supports 53, a single shape support 53 having a width extending substantially over the entire length in the longitudinal direction of the support plate 51 may be used. The support 50 can be integrally formed by injection molding, extrusion molding, a three-dimensional printer, or the like. The support 50 may be configured by combining a plurality of components.

[0064] Returning to FIG. 6, the description will be continued. A first reflector 211 is fixed to the front side of the five shape supports 53 arranged on the upper side. The first reflector 211 is a bendable rectangular sheet having one surface as a mirror surface. The mirror surface of the first reflector 211 forms a concave mirror. The first reflector 211 is fixed with the edge of one long side sandwiched, for example, by a rod-shaped clamping body 27 and the front surface of the support plate 51 as shown in FIG. 5. As shown in FIG. 3, the other long side of the first reflector 211 is also fixed to the shape support 53 via a substantially L-shaped plate-like fixture 59.

[0065] The first reflector 211 may be attached to the shape support 53 with, for example, an adhesive or an adhesive material. The first reflector 211 is formed in a parabolic gutter shape by being in close contact with the parabolic-shaped shape support 53. Similarly, a second reflector 212 is fixed to the front side of the five shape supports 53 arranged on the lower side. The second reflector 212 is also formed in a parabolic gutter shape in a state of being in close contact with the shape support 53.

[0066] The parabolic gutter type means a gutter type in which the inner surface has a parabolic shape in a cross section cut perpendicular to the longitudinal direction. The parabolic gutter type does not mean that the thickness is uniform. Therefore, the shape of the outer surface may be any shape other than a parabola.

[0067] The shape support 53 to which the first reflecting mirror 211 is fixed and the shape support 53 to which the second reflecting mirror 212 is fixed have substantially the same shape. The shape of the mirror surface of the first reflecting mirror 211 and the shape of the mirror surface of the second reflecting mirror 212 are also substantially the same.

[0068] The first reflecting mirror 211 and the second reflecting mirror 212 may be integrally formed with the support 50 by cutting, extrusion molding, a three-dimensional printer, etc., and may be mirror-finished. The first reflecting mirror 211 and the second reflecting mirror 212 may be manufactured by forming a mirror surface on the surface of a resin integrally formed with the support 50 by injection molding, a three-dimensional printer, etc. by vapor deposition of a metal or the like. The first reflecting mirror 211 and the second reflecting mirror 212 may be integrally manufactured by integrally molding the resin support 50 on one surface of a sheet-like mirror.

[0069] The description will be continued using FIG. 5. The lighting substrate 23 is fixed to the plate-shaped lighting substrate base 231 by bolts. The lighting substrate base 231 is fixed to the divided body 52 by bolts. Therefore, the relative positional relationship between the first reflecting mirror 211 and the first LED 221 and the relative positional relationship between the second reflecting mirror 212 and the second LED 222 are respectively fixed. Note that the lighting substrate 23, the lighting substrate base 231, and the divided body 52 may be adhesively fixed.

[0070] FIG. 9 is a perspective view of the light shield 30. FIG. 9 is a view of the light shield 30 as seen from the direction opposite to that in FIG. 4. The light shield support 34 is a rectangular box type with its long side horizontal and the opening facing backward. A plurality of through holes used for screw fixing to the divided body 52 are provided at the bottom of the light shield support 34.

[0071] The first light-shielding plate 31 is a long plate arranged with its longitudinal direction horizontal. In the present embodiment, the first light-shielding plate 31 is a rectangular flat plate arranged horizontally. The horizontal length of the first light-shielding plate 31 is slightly shorter than the horizontal length of the light-shielding support 34. The first light-shielding plate 31 is fixed to the side surface corresponding to the long side of the light-shielding support 34 via three spacers 38. The spacer 38 is pipe-shaped, and a bolt penetrates through the inside thereof.

[0072] The second light-shielding plate 32 includes a parallel plate portion 321 and an inclined plate portion 322. The parallel plate portion 321 is in the shape of a rectangular plate and is arranged parallel to the first light-shielding plate 31. The inclined plate portion 322 is a flat plate extending obliquely upward and forward from the front edge of the second light-shielding plate 32. The inclined plate portion 322 is continuous with the edge of the parallel plate portion 321 and is inclined with respect to the parallel plate portion 321. The second light-shielding plate 32 is manufactured, for example, by bending the central portion of a rectangular plate. The second light-shielding plate 32 is fixed to the first light-shielding plate 31 via two spacers 38. The horizontal length of the second light-shielding plate 32 is about 20 percent of the horizontal length of the first light-shielding plate 31.

[0073] FIG. 10 is a rear view of the light-shielding body 30 and the lighting substrate 23. The two-dot chain line in FIG. 10 indicates the reflecting mirror 21 constituted by the first reflecting mirror 211 and the second reflecting mirror 212. The light-shielding body 30, the second light-shielding plate 32, and the reflecting mirror 21 are symmetric in the horizontal direction. When arranged in order from the one with the longer horizontal length, they are the light-shielding support 34, the first light-shielding plate 31, the reflecting mirror 21, the lighting substrate 23, the array length of the LEDs 22, and the second light-shielding plate 32 in this order.

[0074] The horizontal length of the second light-shielding plate 32 is about half of the array length of the LEDs 22. The horizontal length of the reflecting mirror 21 is more than twice the array length of the LEDs 22. Since the reflecting mirror 21 is not bent in the horizontal direction, the light emitted from each LED 22 is reflected by the reflecting mirror 21 while diffusing in the horizontal direction and further diffuses in the horizontal direction.

[0075] In FIG. 10, C1 indicates the vertical distance between the parallel plate portion 321 of the upper second light-shielding plate 32 among the two second light-shielding plates 32 and the upper end of the first mirror 211. Similarly, C2 indicates the vertical distance between the parallel plate portion 321 of the lower second light-shielding plate 32 among the two second light-shielding plates 32 and the lower end of the second mirror 212. The first light-shielding plate 31 and the second light-shielding plate 32 are arranged such that C1 is slightly shorter than C2.

[0076] The horizontal center line of the light-shielding support 34 is arranged along the same horizontal plane as the horizontal center line of the mirror 21. Therefore, the upper second light-shielding plate 32 among the two second light-shielding plates 32 is arranged at a position farther from the horizontal center line of the light-shielding support 34 than the lower second light-shielding plate 32.

[0077] Note that the shape of the light-shielding body 30 described above is an example. Alternatively, the first light-shielding plate 31 may be arranged at an angle with respect to the horizontal plane. For example, the upper first light-shielding plate 31 may be arranged upward as viewed from the first mirror 211, and the lower first light-shielding plate 31 may be arranged downward as viewed from the second mirror 212. Alternatively, both the upper first light-shielding plate 31 and the lower first light-shielding plate 31 may be arranged in parallel while being inclined with respect to the horizontal plane.

[0078] Alternatively, the first light-shielding plate 31 may be arranged such that its longitudinal direction forms an angle with respect to the horizontal plane. For example, when viewing the aviation obstruction light 10 from the front, the longitudinal directions of the two first light-shielding plates 31 may be arranged to slope upward to the right or upward to the left. Alternatively, the first light-shielding plate 31 may be in a bent plate shape.

[0079] Alternatively, the first light-shielding plate 31 and the parallel plate portion 321 of the second light-shielding plate 32 may form an angle with each other. Alternatively, either the front edge of the first light-shielding plate 31 or the front edge of the second light-shielding plate 32 may protrude forward or backward compared to the other.

[0080] FIG. 11 is a view taken in the direction of arrow XI in FIG. 6. However, in FIG. 11, the divided body 52, the clamping body 27, the lighting substrate 23, and the lighting substrate base 231 are not shown. Using FIG. 11, the positional relationship between the reflecting mirror 21 and the LED 22 will be described.

[0081] As described above, the first reflecting mirror 211 and the second reflecting mirror 212 are parabolic trough-shaped concave mirrors. In the following description, the axis of symmetry of the parabola forming the first reflecting mirror 211 is referred to as the first axis of symmetry 621, and the axis of symmetry of the parabola forming the second reflecting mirror 212 is referred to as the second axis of symmetry 622. In FIG. 11, the first axis of symmetry 621 and the second axis of symmetry 622 are indicated by dashed-dotted lines.

[0082] The first reflecting mirror 211 is arranged obliquely upward, and the first axis of symmetry 621 is inclined about 7 degrees clockwise with respect to the horizontal plane. The first reflecting mirror 211 is arranged obliquely downward, and the second axis of symmetry 622 is inclined about 4 degrees counterclockwise with respect to the horizontal plane.

[0083] Similarly, the focus of the parabola forming the first reflecting mirror 211 is referred to as the first focus 611, and the focus of the parabola forming the second reflecting mirror 212 is referred to as the second focus 612. In FIG. 11, the first focus 611 and the second focus 612 are indicated by small black circles.

[0084] If a point light source is arranged at the focus of a parabolic trough-shaped concave mirror, the light reflected by the concave mirror becomes parallel light in the vertical plane. However, with parallel light rays, it is difficult to realize the aviation obstruction light 10 that satisfies the minimum value of the vertical beam angle among the above specifications. By arranging the point light source at a position slightly deviated from the focus, an aviation obstruction light 10 can be realized in which the reflected light spreads appropriately and light is radiated in an appropriate range.

[0085] In the present embodiment, the first LED 221 is arranged at a position approaching the light transmission window 45 obliquely upward from the first focus 611, and the second LED 222 is arranged at a position approaching the light transmission window 45 obliquely downward from the second focus 612.

[0086] More specifically, the first LED 221 is disposed at a position A1 forward along the first symmetry axis 621 from the first focus 611 and B1 upward along a line perpendicular to the first symmetry axis 621. Similarly, the second LED 222 is disposed at a position A2 forward along the second symmetry axis 622 from the second focus 612 and B2 downward along a line perpendicular to the second symmetry axis 622.

[0087] By disposing the LED 22, which is a point light source, in front of and at positions separated from each other with respect to the foci of the first LED 221 and the second LED 222 arranged vertically, the aviation obstruction light 10 that satisfies the above specifications can be realized.

[0088] In FIG. 11, based on the focal length of the parabola, A1 is about 16%, B1 is about 9%, A2 is about 10%, and B2 is about 5%. Note that the positions of the LEDs 22 shown in FIG. 11 and the inclination amounts of the first symmetry axis 621 and the second symmetry axis 622 are all examples. The inclination amount of the target axis and the positions of the LEDs 22 are determined so as to satisfy the specifications of the aviation obstruction light 10.

[0089] FIG. 12 is an explanatory diagram for explaining the optical path of the reflected light. The results of ray tracing of the light emitted from the first LED 221 toward the first mirror 211 and the light emitted from the second LED 222 toward the second mirror 212 are shown.

[0090] The light rays reflected by the first mirror 211 are concentrated in a range of about 4 degrees upward from the horizontal plane. The light reflected by the second LED 222 is concentrated in a range of about 2 degrees downward from the horizontal plane. By making the distance between the second LED 222 and the second focus 612 closer than the distance between the first LED 221 and the first focus 611, the spread of the light reflected by the second mirror 212 is suppressed compared to the light reflected by the first mirror 211.

[0091] Returning to FIG. 3, the description will be continued. The light radiated in the front direction of the aviation obstruction light 10 is stronger than the light radiated in the left and right diagonal directions of the aviation obstruction light 10. By shielding a part of the light radiated in the front direction by the two second light shielding plates 32 provided at the central part of the aviation obstruction light 10, the balance between the brightness in the front direction and the brightness in the left and right directions can be achieved. Further, it is possible to prevent the vertical beam angle in the front direction from becoming larger than the specification.

[0092] When the light radiated forward from the LED 22 is radiated outside the aviation obstruction light 10, there is a possibility that the LED 22 emitting light from the aircraft or the ground can be visually recognized. Thus, when the light not reflected by the reflecting mirror 21 is radiated, the above-described specifications of the aviation obstruction light 10 are not satisfied. The light shielding body 30 can provide the aviation obstruction light 10 that satisfies the specifications by shielding the light radiated forward from the LED 22.

[0093] Returning to FIG. 5, the dissipation of the heat generated by the LED 22 will be described. The heat is transmitted to the support plate 51 through the illumination substrate 23, the illumination substrate base 231, and the divided body 52. Returning to FIG. 3, the description will be continued. The heat transmitted to the support plate 51 is transmitted to the heat sink 86 and dissipated into the air.

[0094] It is desirable that a heat conductive grease is applied to the contact surfaces of the components constituting the heat transfer path.

[0095] The maintenance work of the aviation obstruction light 10 will be described. The administrator of the aviation obstruction light 10 performs maintenance work such as regular replacement of the illumination substrate 23 in order to avoid a situation where the light is not lit due to a failure or the like. Since the maintenance work is a high-altitude work carried out with a harness, it is desirable that it can be carried out as simply as possible.

[0096] The replacement illumination substrate 23 is supplied in a state of being attached to the illumination substrate base 231. Since the illumination substrate base 231 functions as a reinforcing plate, breakage of the illumination substrate 23 during work is prevented.

[0097] Returning to FIG. 1, the description will be continued. The maintenance worker removes the frame 46 to which the light transmission window 45 is fixed from the housing 89. The aviation obstruction light 10 assumes the state shown in FIG. 3. Note that one side of the frame 46 and the housing 89 may be connected by a hinge and configured to open like a single-leaf door by removing the fixing bolts. Since it is not necessary to move the removed frame 46 to a safe place, work efficiency is improved.

[0098] The maintenance worker removes the bolts fixing the light shield 30 to the divided body 52 and removes the light shield 30. As described with reference to FIG. 9, the light shield support 34 disposed at the center of the light shield 30 is box-shaped and has a thin wall thickness. Therefore, the light shield 30 is lightweight for its size and can be easily held, for example, with one hand.

[0099] Thereafter, the maintenance worker removes the lighting substrate 23 from the divided body 52 and replaces it with a new lighting substrate 23. By attaching the light shield 30 as it was and fixing the frame 46 to the housing 89, the replacement work of the lighting substrate 23 is completed.

[0100] According to the present embodiment, since the two lighting substrates 23 are housed in one housing 89, it is possible to provide the aviation obstruction light 10 that is easy to maintain.

[0101] [Modification Example] Of the five shape supports 53 disposed above or below one support 50, the focal length of the central shape support 53 may be relatively short and the focal lengths of the shape supports 53 at both ends may be relatively long. It is possible to provide the first reflector 211 or the second reflector 212 in a saddle shape that is concave in the vertical direction and convex in the horizontal direction. By being convex in the horizontal direction, it is possible to provide the aviation obstruction light 10 having a wide horizontal beam angle.

[0102] Conversely, the focal length of the central shape support 53 may be relatively long, and the focal lengths of the shape supports 53 at both ends may be relatively short. A concave first reflector 211 or second reflector 212 can be provided both in the vertical direction and in the horizontal direction. By being convex in the horizontal direction, the horizontal beam angle is narrow and the diffusion of light in the horizontal direction is small, so that the aviation obstruction light 10 that can be visually recognized even from a distant airplane can be provided.

[0103] The technical features (constituent elements) described in each embodiment can be combined with each other, and new technical features can be formed by such combination. The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above meaning but by the claims, and all modifications within the meaning and scope equivalent to the claims are intended to be included.

[0104] The independent claims and dependent claims described in the claims can be combined with each other in any combination regardless of the citation form. Further, the claims use a form (multi-claim form) of describing a claim that cites two or more other claims, but it is not limited to this. A form of describing a multi-claim (multi-multi-claim) that cites at least one multi-claim may be used.

Explanation of Signs

[0105] 10 Aviation obstruction light 21 Reflector 211 First reflector (reflector) 212 Second reflector (reflector) 22 LED 221 First LED 222 Second LED 23 Lighting substrate 231 Lighting substrate stand 27 Clamping body 30 Light shielding body 31 First light shielding plate 32 Second light shielding plate 321 Parallel plate part 322 Inclined plate part 34 Light-shielding support 38 Spacer 45 Light-transmitting window 46 Frame 49 Upper reflector 50 Support 51 Support plate 52 Divided body 53 Shape support 59 Fastener 611 First focus 612 Second focus 621 First symmetry axis 622 Second symmetry axis 85 Drain pipe 86 Heat sink 88 Mounting part 89 Housing

Claims

1. A gutter-shaped mirror arranged horizontally in the longitudinal direction, A light transmission window facing the mirror, A plurality of LEDs (Light Emitting Diodes) arranged between the mirror and the light transmission window and arranged in parallel in the longitudinal direction of the mirror, Two first light shielding plates arranged closer to the light transmission window than the LEDs, Two second light shielding plates arranged sandwiching the two first light shielding plates An aviation obstruction light comprising the above.

2. The second light shielding plate A parallel plate portion parallel to the first light shielding plate, And an inclined plate portion continuous with the edge of the parallel plate portion and inclined with respect to the parallel plate portion The aviation obstruction light according to Claim 1.

3. The parallel plate portions of the two second light shielding plates are parallel to each other, The inclined plate portions of the two second light shielding plates are parallel to each other The aviation obstruction light according to Claim 2.

4. The parallel plate portion is arranged horizontally, The vertical distance between the parallel plate portion of the upper second light shielding plate and the upper end of the mirror among the two second light shielding plates is shorter than the vertical distance between the parallel plate portion of the lower second light shielding plate and the lower end of the mirror The aviation obstruction light according to Claim 2.

5. The first light shielding plate is a long plate arranged horizontally in the longitudinal direction, The horizontal length of the first light shielding plate is longer than the arrangement length of the LEDs, The horizontal length of the second light shielding plate is shorter than the arrangement length of the LEDs The aviation obstruction light according to Claim 1.

6. The first light-shielding plate is a long plate arranged horizontally in the longitudinal direction. The horizontal length of the reflecting mirror is longer than the array length of the LEDs. The horizontal length of the first light-shielding plate is longer than the horizontal length of the reflecting mirror. The aviation obstruction light according to claim 1.

7. The reflecting mirror is divided into a first reflecting mirror located above and a second reflecting mirror located below, sandwiching a horizontally arranged divided body. The LEDs are a first LED arranged above the divided body, and a second LED arranged below the divided body. The aviation obstruction light according to claim 1.

8. The first LED is shielded by the first light-shielding plate located above the divided body and cannot be visually recognized from outside the light transmission window. The aviation obstruction light according to claim 7.

9. The first light-shielding plate is arranged horizontally. The aviation obstruction light according to any one of claims 1 to 8.

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