Lighting for airway marking

Abstract

To provide a lamp capable of preventing a viewer from losing the lamp when approaching the lamp, and improving visibility and attractiveness of the lamp even when a sea surface is shaking.SOLUTION: A lamp for a navigation aid comprises LED light sources which are arranged in a single circumference on a cylindrical base, a reflector, and a hood, where the reflector is inclined at a high angle with an upper side of the LED light source as a base end and a tip reaching the hood, the hood has a horizontal irradiation part and an upward irradiation part, and a vertical length of the reflector is longer than a vertical length of the horizontal irradiation part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a navigational light. [Background technology]

[0002] Conventionally, gas lamps, light bulbs, and light-emitting diodes (LEDs) have been used as light sources in navigational aids. In particular, navigational aids that use small, low-power LED light sources have been proposed (see, for example, Patent Documents 1-4).

[0003] These navigational aid lamps use LED light sources, which are smaller in size and consume less power than gas lamps or light bulbs. They are fitted with covers equipped with Fresnel lenses that focus the direction of light (optical axis), improving visibility from a distance by aligning the viewer's eye height with the direction of light.

[0004] In particular, Patent Document 4 is a prior art document that uses a reflector, but according to a vertical cross-sectional view, it discloses one that is inclined approximately 15 degrees up and down with respect to the irradiation direction of the light-emitting diode. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 7-77081 [Patent Document 2] Japanese Patent Application Publication No. 6-44808 (Patent No. 2668181) [Patent Document 3] JP 2001-135102 A [Patent Document 4] JP 2007-313946 A Summary of the Invention [Problem to be solved by the invention]

[0006] The above-mentioned LED light source navigation lamp uses a Fresnel lens that focuses the light beam (optical axis), and the light beam from the LED light source itself has a high linearity. Therefore, when used for a light buoy installed on the water surface, which is a type of navigational aid, the deviation between the eye height of the viewer and the direction of illumination becomes large when a ship approaches very close to the navigational aid. Furthermore, the lamp may tilt due to the rolling of the sea surface, which may further increase the deviation from the direction of illumination. This reduces the viewer's ability to see the position of the navigational aid (visibility) and whether the navigational aid lamp itself is emitting light (attractiveness), making it difficult for the viewer to determine the position of the navigational aid, and there was even concern that the navigational aid would be lost when approaching.

[0007] Therefore, the present invention aims to provide a navigational light that can improve visibility and conspicuousness, and in particular, is easy to distinguish even when a ship approaches the navigational light and the viewer's line of sight is above the navigational light, or when the light is tilted due to sea surface rolling. [Means for solving the problem]

[0008] In view of the above problems, the present invention provides a navigational aid lamp that includes an LED light source arranged on a cylindrical base, a reflector, and a hood, The LED light source is In the direction perpendicular to the horizontal direction which is the irradiation direction of the LED light source on the base are arranged in a single row along the circumference at the bottom, The reflector is disposed relative to the LED light source. The opposite direction to the downward direction. basis body The nozzle is arranged so that it is inclined at a high angle of 68 degrees to 82 degrees from the horizontal direction from the base end above the nozzle to the tip of the hood, The hood is formed with a horizontal irradiation portion including a curved lens on a horizontal extension line of the LED light source and upper and lower bent portions of the curved lens, A navigational light, characterized in that the vertical length of the reflector is longer than the vertical length of the horizontal illumination portion.

[0009] In addition to the above-mentioned configuration, the hood is on the horizontal extension line of the reflector, and the horizontal irradiation portion of the hood is arranged to irradiate the LED light source. The direction of the base is opposite to the downward direction. 2. The navigational light according to claim 1, characterized in that it has an upward illumination portion having a surface that is finely bent upward. Effect of the Invention

[0012] According to the present invention, with the invention of claim 1, even if a discrepancy occurs between the height from the navigational aid lamp and the eye height of the viewer as a ship approaches, the reflector widens the divergence angle, making the navigational aid lamp visible.

[0013] Also, By equipping a reflector with a tolerance of 75 degrees ±7 degrees, even if the viewer's eye height differs from the horizontal by 700mm or 900mm, the light is directed upwards so that the viewer will not lose sight of the light when approaching it. Furthermore, even if there is rolling on the sea surface, the desired effect is achieved, making it possible to improve the visibility and attention of the light.

[0014] Also, The reflector is formed so that the portion irradiated horizontally from the LED light source is also long in the vertical direction, and the divergent light from the LED light source is reflected over a wide area and irradiated upwards. This prevents the viewer from losing sight of the lamp when approaching it, and even if the sea surface is choppy, it has a specified effect, improving the visibility and attention of the lamp.

[0015] Claim 2 According to the invention, by having an upward illumination part that is bent finely upward in a position facing a reflector that has a predetermined height and reflects divergent light over a wide range at a high angle, it is possible to illuminate the divergent light further upward. This prevents the viewer from losing sight of the lamp when approaching it, and by exerting a predetermined effect even when the sea surface is rolling, it is possible to improve the visibility and attention of the lamp. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a vertical cross-sectional view showing an example of a navigational beacon lamp of the present invention. [Diagram 2] 1 for illustrating a trajectory of reflected light from an LED light source. FIG. [Diagram 3] 1 is a measurement graph of Experiment 1. [Figure 4] 13 is a measurement graph of experiment 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] (Embodiment) An example of a navigational aid lamp according to an embodiment of the present invention will be described in detail with reference to FIG. 1. The navigational aid in this embodiment is a buoy that is set floating on the sea and a light buoy with a navigational aid lamp 1 attached to the top of the buoy. The navigational aid lamp 1 shown in the embodiment is a simple beacon that is not subject to the "Navigational Aids Act" (a simple lighthouse, light beacon, or light buoy with a luminous intensity of less than 15 candelas and / or a vertical projection area of ​​less than 2 square meters). The navigational aid lamp 1 is installed as a marker around marine facilities such as fish pens, fixed nets, aquaculture rafts, and temporary piers and is used by ships that navigate the area. Solar panels, batteries, or the like (not shown) are used to supply power to the LED light sources 2, 2, and the LED light sources 2, 2 are colored.

[0018] As shown in Figure 1, the navigational light 1 has multiple LED light sources 2, 2 arranged in a single row on a horizontal circumference at the bottom of a cylindrical base 10, and a stainless steel reflector 3 inclined at a high angle so that it diverges from the horizontal circumference toward the top is arranged. The LED light sources 2, 2 have a cylindrical shape with a hemispherical top, and are molded entirely from soft resin, with a limited divergence angle from the LED light sources 2, 2, allowing the emitted light to reach farther positions. The LED light sources 2, 2 are arranged in the lower third of the vertical height of the base 10.

[0019] A spacer 5 extending further upward from the mount 4 is attached below the cylindrical base 10. A hood 6 is used, which is a colorless and transparent Fresnel lens using a curved lens 6a and bent portions 6b, 6b. The hood 6 is attached like a cover that covers the reflector 3, the LED light sources 2, 2, and the spacer 5 attached to the base 10. When covering the hood 6, it is fastened by an O-ring 7 and a bolt 8 on the upper surface of the mount 4, and the contact surfaces of the lower surface of the hood 6 and the upper surface of the mount 4 are applied with an oil compound and bonded together to seal the storage space of the hood 6. This makes it possible to prevent salt damage even when the navigational aid lamp 1 is placed on the sea.

[0020] The hood 6 has a curved lens 6a arranged on the horizontal extension of the LED light sources 2, 2, and large bent portions (upper bent portion 6b, lower bent portion 6b) are formed above and below the lens body 6a for bending in the horizontal direction. The portion consisting of the curved lens 6a and the upper and lower bent portions 6b, 6b is the horizontal irradiation portion 6c. When passing through the horizontal irradiation portion 6c, the curved lens 6a and the upper and lower bent portions 6b, 6b perform irradiation in the horizontal direction. Furthermore, above the upper bent portion 6b, a plurality of fine bends are formed to form an upper irradiation portion 6d that irradiates upward (see FIG. 2). In this description, the horizontal irradiation does not refer to only the horizontal direction, but refers to a certain range that is approximately horizontal in order to irradiate in the distance.

[0021] The reflector 3 is disposed singly above the LED light sources 2,2, and is disposed so as to be inclined at a high angle with respect to the horizontal direction of the LED light sources 2,2. That is, the base end of the reflector 3 reaches a position corresponding to the upper bent portion 6b in the horizontal direction, and the upper end is extended to the upper portion of the hood 6. The vertical length h1 of the reflector 3 is longer than the height h2 of the horizontal irradiation portion 6c which is the combination of the curved lens 6a of the hood 6 and the upper and lower bent portions 6b, 6b. The inclination of the reflector 3 is preferably a high angle of 60 degrees or more and less than 90 degrees, and is preferably 68 degrees to 82 degrees taking into account the tolerance of ±7 degrees that allows for an error of 75 degrees, and is most preferably 75 degrees. Note that the reflector 3 of this embodiment uses a stainless steel reflector, but may be made of other materials such as aluminum.

[0022] A description will be given of the illumination of the navigational aid lamp 1 of this embodiment. Illumination from the LED light sources 2, 2 is mainly directed horizontally, and is irradiated horizontally by the curved lens 6a of the hood 6 and the upper and lower bent portions 6b, 6b.

[0023] Next, a state will be described in which the divergent light from the LED light sources 2, 2 prevents the viewer from losing sight of the navigational light 1 even when the navigational light 1 is lower than the viewer's line of sight and the navigational light 1 is close to the viewer's line of sight or when the sea surface is shaking and the navigational light 1 is significantly tilted. As shown in Fig. 2, the divergent light (shown by solid lines in Fig. 2) near the optical axis (direction of horizontal irradiation) from the LED light sources 2, 2 and the divergent light (shown by solid lines in Fig. 2) in the vertical direction irradiated from the side of the LED light sources 2, 2 are diverged through the hood 6. At this time, the reflected light (shown by dashed lines in Fig. 2) reflected by the reflector 3 overlaps with the divergent light near the optical axis, which enables the LED light sources 2, 2 to extend their light reach.

[0024] In addition, by using a Fresnel lens having an upward illumination portion 6d above the horizontal illumination portion 6c for the hood 6, the divergent light transmitted from the LED light sources 2, 2 to the upward illumination portion 6d is diverged in an upward direction, making the light source appear larger.

[0025] Next, we will explain the experimental results of the visibility and conspicuousness of the navigational marking lamp 1. In the experiment, we measured the visibility and conspicuousness of the navigational marking lamp 1 when it was moved in the downward direction D in Fig. 1, assuming that the viewer approaches the lamp and the navigational marking lamp 1 is positioned below the viewer's line of sight (Experiment 1). We also measured the visibility and conspicuousness of the navigational marking lamp 1 when it was tilted in the direction of the arrow R in Fig. 1, assuming that the navigational marking lamp 1 is tilted at a specified angle due to rolling of the sea surface (Experiment 2).

[0026] In Experiments 1 and 2, the angle θ (see Figure 2) of the reflector 3 inclined from the horizontal direction at the base end on the LED light source 2, 2 side was changed to 30 degrees, 45 degrees, 60 degrees, 75 degrees, and 90 degrees. The luminous intensity was measured at a horizontal distance of 1 m from the LED light sources 2, 2.

[0027] Here, eye-catching refers to the degree to which an object attracts a person's attention, and the larger the size of the object (light source) and the higher the luminosity of the object, the higher the eye-catching. Also, the more highly saturated the object is compared to the saturation of the object, the higher the eye-catching. In the present invention, the LED light sources 2, 2 are colored.

[0028] The results of experiment 1, which measured the visibility and attention when the navigational light 1 was moved downward in the D direction, are explained in Fig. 3. According to Fig. 3, there was no significant difference when the height from the optical axis indicating horizontal irradiation was 200mm or 300mm, but it was found that when the height was higher than 400mm, a reflector with an angle of 30 degrees or more exhibited visibility and attention. Furthermore, when the height from the light source was 700mm or more, reflectors with angles of 60 degrees and 75 degrees were used, it was found that they had higher visibility and attention than other reflectors, and when the height was 900mm or more, a 75-degree reflector had more than twice the luminous intensity of reflectors with other angles, and when the reflector was 90 degrees, it was found that it was no different from a 30-degree reflector.

[0029] Next, the results of experiment 2, which measured the visibility and conspicuousness of the navigational light 1 when it was tilted in the direction of the arrow R, are explained using Figure 4. As Figure 4 shows, when the navigational light 1 was tilted up to 30 degrees, the results were confusing, probably because it was aligned with the optical axis, but when it was tilted at 40 degrees or more, the difference in luminous intensity due to the angle of the reflector became clearly apparent. When the navigational light 1 was tilted at 40 degrees or more, high visibility and conspicuousness were observed when a reflector of 45 degrees or more was used. Furthermore, when the navigational light 1 was tilted at a high angle of 70 degrees or more, it became clear that high visibility and conspicuousness were obtained when a reflector of 60 degrees or 75 degrees was used.

[0030] As described above, the configuration enables a viewer to see the navigational marking lamp 1 from a distance (improved visibility), and also enables a viewer to see the light source of the navigational marking lamp 1 even when the viewer approaches the navigational marking lamp 1 (improved conspicuousness).

[0031] Although the above embodiment illustrates a preferred embodiment of the present invention, the present invention is not limited to the above embodiment, and the angle θ of the reflector 3 is preferably greater than or equal to 60 degrees and less than 90 degrees, more preferably 75 degrees, and is preferably ±7 degrees including a tolerance. [Explanation of symbols]

[0032] 1...navigational aid lamp, 2...LED light source, 3...reflector, 4...mount, 5...spacer, 6...hood, 6a...curved lens, 6b...bending portion, 6c...horizontal irradiation portion, 6d...upward irradiation portion, 7...O-ring, 8...bolt, 10...base.

Claims

1. The lamp comprises an LED light source arranged on a cylindrical base, a reflector, and a hood, The LED light sources are arranged along a single row along a circumference in a direction perpendicular to a horizontal direction, which is an irradiation direction of the LED light sources on the base, The reflector is arranged so as to be inclined at a high angle in the range of 68 degrees to 82 degrees from a horizontal direction from a base end located above the base body, which is in a direction opposite to the downward direction with respect to the LED light source, to a tip end of the reflector that reaches the hood; The hood is formed with a horizontal irradiation portion including a curved lens on a horizontal extension line of the LED light source and upper and lower bent portions of the curved lens, A navigational light, characterized in that the vertical length of the reflector is longer than the vertical length of the horizontal illumination portion.

2. 2. The navigational light according to claim 1, wherein the hood has an upward illumination portion which is on a horizontal extension of the reflector and has a surface which is slightly bent upward from the horizontal illumination portion of the hood toward the upper side of the base in the opposite direction to the downward direction of the LED light source.

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