Aircraft warning light

Abstract

To provide an aircraft warning light that radiates light within an appropriate range.SOLUTION: An aircraft warning light 10 comprises: a gutter-type first reflection mirror 211 arranged with a longitudinal direction thereof horizontal; a gutter-type second reflection mirror 212 arranged parallel to the first reflection mirror 211 below the first reflection mirror 211; a light-transmitting window 45 arranged opposite the first reflection mirror 211 and the second reflection mirror 212; a plurality of first light emitting diodes (LEDs) arranged parallel to the longitudinal direction of the first reflection mirror 211, and positioned between the first reflection mirror 211 and the light-transmitting window 45; and a plurality of second LEDs arranged parallel to the longitudinal direction of the second reflection mirror 212, and positioned between the second reflection mirror 212 and the light-transmitting window 45.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] There has been proposed a medium-intensity aviation obstruction light that reflects light emitted from LEDs (Light Emitting Diodes) arranged on a horizontal circuit board with an annular reflector and emits light over the entire circumference in the horizontal direction (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 has an advantage that, for example, when installed at the top of a tower, it can emit light in all directions in the horizontal direction with a single unit. However, when installed in the middle of a structure, the light radiated toward the structure is wasted.

[0006] On one side, 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 is in the shape of a gutter, and includes a first reflector arranged horizontally in the longitudinal direction, a gutter-shaped second reflector arranged parallel to the first reflector under the first reflector, a light transmission window facing the first reflector and the second reflector, a plurality of first LEDs arranged between the first reflector and the light transmission window and arranged parallel to the longitudinal direction of the first reflector, and a plurality of second LEDs arranged between the second reflector and the light transmission window and arranged parallel to the longitudinal direction of the second reflector.

Advantages of the Invention

[0008] On one hand, 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 in the shape of a gutter, a first reflector arranged horizontally in the longitudinal direction, below the first reflector, a gutter-shaped second reflector arranged parallel to the first reflector, a light transmission window facing the first reflector and the second reflector, arranged between the first reflector and the light transmission window, a plurality of first LEDs (Light Emitting Diodes) arranged in parallel in the longitudinal direction of the first reflector, arranged between the second reflector and the light transmission window, a plurality of second LEDs arranged in parallel in the longitudinal direction of the second reflector and includes.

[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 described in (1) above, the first reflector and the second reflector may be in the shape of a parabolic gutter.

[0013] According to the aviation obstruction light described in (2) above, an aviation obstruction light that can radiate light far away can be provided.

[0014] (3) In the aviation obstruction light described in (1) or (2) above, the first reflector and the second reflector have a shape in which one part cut by the axis of symmetry of the parabola is formed in the shape of a gutter, the first reflector and the second reflector may be arranged at intervals in the vertical direction.

[0015] According to the aviation obstruction light described in (3) above, an aviation obstruction light capable of arranging LEDs in a place where it is difficult to block the reflected light of each of the first reflector and the second reflector can be provided.

[0016] (4) In the aviation obstruction light described in (2) or (3) above, The axis of symmetry of the parabola forming the first reflector is arranged obliquely upward. The axis of symmetry of the parabola forming the second reflector may be arranged obliquely downward.

[0017] According to the aviation obstacle light described in (4) above, an aviation obstacle light capable of emitting light above and below the horizontal plane can be provided.

[0018] (5) In the aviation obstacle light according to any one of (2) to (4) above, The first LED is arranged at a position away from the focus of the first reflector, The second LED may be arranged at a position away from the focus of the second reflector.

[0019] According to the aviation obstacle light described in (5) above, an aviation obstacle light in which the reflected light by the first reflector and the second reflector is not parallel light can be provided.

[0020] (6) In the aviation obstacle light according to any one of (2) to (5) above, The first LED is arranged at a position approaching the light transmission window obliquely upward from the focus of the first reflector, The second LED may be arranged at a position approaching the light transmission window obliquely downward from the focus of the second reflector.

[0021] According to the aviation obstacle light described in (6) above, an aviation obstacle light that radiates the reflected light by the first reflector and the second reflector within an appropriate range can be provided.

[0022] (7) In the aviation obstacle light according to any one of (2) to (6) above, The distance between the first LED and the focus of the first reflector may be longer than the distance between the second LED and the focus of the second reflector.

[0023] According to the aviation obstacle light described in (7) above, an aviation obstacle light can be provided in which the spread of the reflected light by the second reflector is less than the spread of the reflected light by the first reflector.

[0024] (8) In the aviation obstruction light according to any one of (2) to (7) above, The parabola forming the first reflector and the parabola forming the second reflector have the same shape, The length of the first reflector and the length of the second reflector may be the same.

[0025] According to the aviation obstruction light described in (8) above, an aviation obstruction light can be provided in which the components forming the first reflector and the components forming the second reflector are made common.

[0026] (9) In the aviation obstruction light according to any one of (1) to (8) above, The array length of the first LED is shorter than the length of the first reflector, The array length of the second LED may be the same as the array length of the first LED.

[0027] According to the aviation obstruction light described in (9) above, an aviation obstruction light can be provided that spreads the reflected light by the first reflector and the second reflector in the horizontal direction.

[0028] (10) In the aviation obstruction light according to any one of (1) to (9) above, The first LED and the second LED may blink simultaneously.

[0029] According to the aviation obstruction light described in (10) above, a blinking aviation obstruction light can be provided.

[0030] There has been proposed a medium-intensity aviation obstruction light that reflects the light emitted from an LED arranged on a horizontal circuit board with an annular reflector and emits light over the entire circumference in the horizontal direction (Patent Document 1). Such an aviation obstruction light has the advantage that, for example, when installed at the top of a tower, it can emit light in all directions in the horizontal direction with a single unit. However, when installed in the middle of a structure, the light emitted toward the structure is wasted.

[0031] For the light source of a high-intensity aviation obstruction light that requires a higher luminous intensity than the above medium-intensity aviation obstruction light, a xenon tube has mainly been used. The 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.

[0032] By using a high-brightness LED with a longer lifespan than a xenon tube as the light source of an aviation obstruction light, the replacement cycle of the light source can be extended, and the maintenance cost of the aviation obstruction light can be reduced. However, the LED needs 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.

[0033] Furthermore, the LED generates a large amount of heat. If the required number of LEDs to obtain the necessary luminous intensity is mounted on a single circuit board, the temperature of the circuit board will rise, which may cause adverse effects such as damage to the circuit board and shortening of the lifespan of the LED. To avoid such adverse effects, it is conceivable to mount the required number of LEDs separately on multiple circuit boards.

[0034] However, when simply replacing the conventional xenon tube with LEDs mounted on multiple circuit boards, most of the light reflected by the gutter-shaped reflector will be blocked by the opaque circuit board. 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 LED itself generates heat, making the LED prone to overheating. Since the LED is likely to have a shorter lifespan due to overheating, the advantage of the LED having a long lifespan is lost.

[0035] By realizing the positional relationship between the LED and the gutter-shaped reflector that avoids the adverse effects associated with using an opaque circuit board, a high-intensity aviation obstruction light with a long lifespan and low maintenance cost can be provided. Specific examples will be described below.

[0036] [Embodiment 1] FIG. 1 is a perspective view of the 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.

[0037] The aviation obstruction light 10 of this embodiment is a high-intensity aviation obstruction light that flashes a white light. According to the Enforcement Regulations of the Aviation Law, a high-intensity aviation obstruction light used in a place with a high background luminance shall emit light with an effective 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.

[0038] That is, for a high-intensity aviation obstruction light, it is legally required to suppress the light emitted below the horizontal plane to a luminous intensity of 1 / 20 or less of the light emitted on the horizontal plane while emitting high-intensity light on the horizontal plane.

[0039] Note that the aviation obstruction light 10 may 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 a high background luminance is set lower than that of the high-intensity aviation obstruction light.

[0040] Although not a legal requirement, it is not desirable to emit unnecessarily high-intensity light above the horizontal plane because it is a waste of energy. When the angle at which the light with the luminous intensity specified by the Enforcement Regulations of the Aviation Law is emitted 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.

[0041] Therefore, in addition to the provisions of the above-mentioned Enforcement Regulations of the Aviation Law, additional conditions are defined by a specification or the like. The aviation obstruction light 10 of this embodiment emits 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.

[0042] As is clear from the above description, the aviation obstruction light 10 of the present embodiment flashes a white flash that is thin in the vertical direction and spreads in the horizontal direction. Regarding the cable that supplies power, control signals, etc. to the aviation obstruction light 10, illustration is omitted. The power supply, control signals, etc. may be supplied wirelessly.

[0043] As shown in FIG. 1, the aviation obstruction light 10 includes a housing 89, a light transmission 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 with its bottom surface facing the rear side, its long side in the left - right direction, and its short side in the up - down direction. The light transmission window 45 is a light - transmissive flat plate. The frame 46 is a rectangular frame that holds the periphery of the light transmission window 45 in a watertight manner.

[0044] The frame 46 is fixed to the opening of the housing 89 in a watertight manner by a plurality of bolts or the like. Regarding the packing or the like for realizing watertightness, since it has been conventionally used, illustration and description are omitted. The light transmission window 45, the frame 46, and the housing 89 form a substantially rectangular parallelepiped.

[0045] 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.

[0046] 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 its 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 will be discharged through the drain pipe 85.

[0047] Along the lower edge of the light transmission window 45, a rectangular plate-shaped upper reflector 49 is arranged. A part of the light that has passed through the light transmission window 45 obliquely downward is diffusely reflected upward by the upper surface of the upper reflector 49. Due to this reflected light, the presence of the aviation obstruction light 10 can be visually recognized from an aircraft in the sky.

[0048] FIG. 3 is a longitudinal sectional view of the aviation obstruction light 10. FIG. 3 shows a cross section of the aviation obstruction light 10 with the frame 46 removed. 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 taken 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.

[0053] As shown in FIGS. 4 to 6, the first reflecting mirror 211 and the second reflecting mirror 212 are gutter-shaped concave mirrors arranged with their longitudinal directions horizontal. The first reflecting mirror 211 and the second reflecting mirror 212 have substantially the same shape. The second reflecting mirror 212 is disposed below the first reflecting mirror 211 and is arranged upside down with respect to the first reflecting mirror 211.

[0054] The first reflecting mirror 211 and the second reflecting mirror 212 are arranged with their concave mirror surfaces facing forward. The first reflecting mirror 211 and the second reflecting mirror 212 form a reflecting mirror 21 which is a gutter-shaped concave mirror. That is, the reflecting mirror 21 is divided into the first reflecting mirror 211 and the second reflecting mirror 212 by a dividing body 52 which forms a part of the support 50.

[0055] In front of the first reflecting mirror 211, an illumination substrate 23 which is a circuit board is arranged. 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 reflecting mirror 211. As shown in FIG. 5, the first LED 221 is disposed between the first reflecting 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 reflecting mirror 211.

[0056] Similarly, the illumination substrate 23 is also arranged in front of the second reflecting mirror 212. A plurality of second LEDs 222 are mounted on the surface of the illumination substrate 23 facing the second LED 222. That is, the second LED 222 is disposed between the second reflecting 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 reflecting mirror 212.

[0057] Details of the shapes of the first reflecting mirror 211 and the second reflecting mirror 212, as well as the structure for maintaining the shapes, will be described later. Similarly, the positions of the first LED 221 and the second LED 222, as well as the structure for holding the two illumination substrates 23 respectively, will also be described later. In the following description, when there is no need to distinguish between the first LED 221 and the second LED 222, it may be simply described as LED 22 (see FIG. 10).

[0058] 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.

[0059] 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.

[0060] The light emitted from the first LED 221 is reflected by the first mirror 211 and then passes through the gap in the upper half of the light shield 30 or above the second light shield plate 32 and 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 gap in the lower half of the light shield 30 or below the second light shield plate 32 and passes through the light transmission window 45.

[0061] 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 a substantially rectangular plate disposed with its longitudinal direction horizontal and its short side 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.

[0062] The divided body 52 projects forward from the central portion of the front surface of the support plate 51. The divided body 52 is 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.

[0063] 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.

[0064] 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 over substantially 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.

[0065] 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 bracket 59.

[0066] The first reflector 211 may be attached to the shape support 53 by, 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.

[0067] 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.

[0068] 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.

[0069] 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 a resin support 50 on one surface of a sheet-like mirror.

[0070] The explanation will be continued using FIG. 5. The lighting substrate 23 is fixed to a 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.

[0071] FIG. 9 is a perspective view of the light shield 30. FIG. 9 is a view of the light shield 30 seen from the direction opposite to that of FIG. 4. The light shield support 34 is a rectangular box shape with its long side horizontal and the opening facing backward. A plurality of through holes used for screwing to the divided body 52 are provided at the bottom of the light shield support 34.

[0072] 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 has a bolt passing through its interior.

[0073] 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 at 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.

[0074] 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, the order is the light-shielding support 34, the first light-shielding plate 31, the reflecting mirror 21, the lighting substrate 23, the arrangement length of the LEDs 22, and the second light-shielding plate 32.

[0075] The horizontal length of the second light-shielding plate 32 is about half of the arrangement length of the LEDs 22. The horizontal length of the reflecting mirror 21 is more than twice the arrangement 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.

[0076] 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.

[0077] 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.

[0078] 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 in a state inclined with respect to the horizontal plane.

[0079] 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 two first light-shielding plates 31 may be arranged with their longitudinal directions rising to the upper right or upper left. Alternatively, the first light-shielding plate 31 may be in a bent plate shape.

[0080] 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.

[0081] FIG. 11 is a view seen from 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. FIG. 11 is used to explain the positional relationship between the reflecting mirror 21 and the LED 22.

[0082] 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 constituting the first reflecting mirror 211 is referred to as the first axis of symmetry 621, and the axis of symmetry of the parabola constituting 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 shown as dashed-dotted lines.

[0083] The first reflecting mirror 211 is arranged obliquely upward, and the first axis of symmetry 621 is inclined clockwise by about 7 degrees with respect to the horizontal plane. The first reflecting mirror 211 is arranged obliquely downward, and the second axis of symmetry 622 is inclined counterclockwise by about 4 degrees with respect to the horizontal plane.

[0084] Similarly, the focus of the parabola constituting the first reflecting mirror 211 is referred to as the first focus 611, and the focus of the parabola constituting 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 shown as small black circles.

[0085] 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 lamp 10 that satisfies the minimum value of the vertical beam angle among the above-mentioned specifications. By arranging the point light source at a position slightly deviated from the focus, an aviation obstruction lamp 10 can be realized in which the reflected light spreads appropriately and light is radiated within an appropriate range.

[0086] 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.

[0087] More specifically, the first LED 221 is disposed at a position that is A1 forward along the first symmetry axis 621 from the first focal point 611 and B1 upward along a line perpendicular to the first symmetry axis 621. Similarly, the second LED 222 is disposed at a position that is A2 forward along the second symmetry axis 622 from the second focal point 612 and B2 downward along a line perpendicular to the second symmetry axis 622.

[0088] 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 focal points 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.

[0089] In FIG. 11, based on the focal length of the parabola, A1 is about 16 percent, B1 is about 9 percent, A2 is about 10 percent, and B2 is about 5 percent. 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.

[0090] FIG. 12 is an explanatory diagram for explaining the optical path of the reflected light. The result of ray tracing of the light radiated from the first LED 221 toward the first mirror 211 and the light radiated from the second LED 222 toward the second mirror 212 is shown.

[0091] 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 focal point 612 closer than the distance between the first LED 221 and the first focal point 611, the spread of the light reflected by the second mirror 212 is suppressed compared to the light reflected by the first mirror 211.

[0092] 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. Furthermore, it is possible to prevent the vertical beam angle in the front direction from becoming larger than the specification.

[0093] 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. By shielding the light radiated forward from the LED 22 with the light-shielding body 30, it is possible to provide the aviation obstruction light 10 that satisfies the specifications.

[0094] Returning to FIG. 5, the dissipation of heat generated by the LED 22 will be described. The heat is transmitted to the support plate 51 through the lighting substrate 23, the lighting 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.

[0095] It is desirable that heat-conductive grease is applied to the contact surfaces between the components constituting the heat transfer path.

[0096] 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 lighting 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-place work carried out with a harness attached, it is desirable that it can be carried out as simply as possible.

[0097] The lighting substrate 23 for replacement is supplied in a state of being attached to the lighting substrate base 231. Since the lighting substrate base 231 functions as a reinforcing plate, damage to the lighting substrate 23 during the work is prevented.

[0098] 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.

[0099] The maintenance worker removes the bolts fixing the light shielding body 30 to the divided body 52 and removes the light shielding body 30. As described with reference to FIG. 9, the light shielding support 34 disposed at the center of the light shielding body 30 is box-shaped and has a thin wall thickness. Therefore, the light shielding body 30 is lightweight for its size and can be easily held, for example, with one hand.

[0100] 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 shielding body 30 as it was and fixing the frame 46 to the housing 89, the replacement work of the lighting substrate 23 is completed.

[0101] According to the present embodiment, since two lighting substrates 23 are accommodated in one housing 89, it is possible to provide the aviation obstruction light 10 that is easy to maintain.

[0102] [Modification Example] Among 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 reflecting mirror 211 or the second reflecting mirror 212 having 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.

[0103] 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. Concave first reflectors 211 or second reflectors 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.

[0104] The technical features (constituent elements) described in each embodiment can be combined with each other, and new technical features can be formed by the 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 scope of claims, and it is intended that all modifications within the meaning and scope equivalent to the scope of claims are included.

[0105] The independent claims and dependent claims described in the scope of claims can be combined with each other in any combination regardless of the citation form. Further, the scope of claims uses a form (multi-claim form) in which claims that cite two or more other claims are described, but it is not limited to this. A form in which a multi-claim (multi-multi-claim) that cites at least one multi-claim may be described may be used.

Explanation of reference numerals

[0106] 10 Aviation obstruction light 21 Reflector 211 First reflector 212 Second 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 portion 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 first reflector in a trough shape, arranged with its longitudinal direction horizontal, A trough-shaped second reflector arranged parallel to the first reflector under the first reflector, A light transmission window facing the first reflector and the second reflector, Arranged between the first reflector and the light transmission window, a plurality of first LEDs (Light Emitting Diodes) arranged parallel to the longitudinal direction of the first reflector, Arranged between the second reflector and the light transmission window, a plurality of second LEDs arranged parallel to the longitudinal direction of the second reflector An aviation obstruction light comprising the above.

2. The first reflector and the second reflector are in a parabolic trough shape The aviation obstruction light according to Claim 1.

3. The first reflector and the second reflector have a shape in which one part cut by the axis of symmetry of the parabola is formed in a trough shape, The first reflector and the second reflector are arranged at intervals in the vertical direction The aviation obstruction light according to Claim 1.

4. The axis of symmetry of the parabola forming the first reflector is arranged obliquely upward, The axis of symmetry of the parabola forming the second reflector is arranged obliquely downward The aviation obstruction light according to Claim 2.

5. The first LED is arranged at a position away from the focus of the first reflector, The second LED is arranged at a position away from the focus of the second reflector The aviation obstruction light according to Claim 2.

6. The first LED is arranged at a position approaching the light transmission window obliquely upward from the focus of the first reflector, The second LED is arranged at a position obliquely downward from the focal point of the second reflector and approaching the light transmission window. The aviation obstruction lamp according to claim 5.

7. The distance between the first LED and the focal point of the first reflector is longer than the distance between the second LED and the focal point of the second reflector. The aviation obstruction lamp according to claim 5.

8. The parabola forming the first reflector and the parabola forming the second reflector have the same shape. The length of the first reflector is the same as the length of the second reflector. The aviation obstruction lamp according to claim 2.

9. The arrangement length of the first LED is shorter than the length of the first reflector. The arrangement length of the second LED is the same as the arrangement length of the first LED. The aviation obstruction lamp according to claim 1.

10. The first LED and the second LED blink simultaneously. The aviation obstruction lamp according to any one of claims 1 to 9.

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