lighting equipment

Abstract

To provide a lighting device that can easily match the actual peak angle in the AA light distribution characteristics with the target peak angle and can increase illuminance over a wide range in the tunnel axis direction. [Solution] The lighting device is a straight tube type lighting device that is installed on the installation surface of a culvert and irradiates light in a direction opposite to the installation surface, and includes a plurality of LED elements, two LED substrates on which the plurality of LED elements are arranged along the tube axis direction and arranged so that the non-mounted surfaces of the LED elements face each other, and a translucent protective tube that houses the LED substrates, and the LED substrates have a first substrate portion on which the LED elements are mounted and a second substrate portion formed by bending the first substrate portion at a predetermined substrate bending angle θ1, and the substrate bending angle θ1 is 50°

Description

[Technical Field]

[0001] The present invention relates to a lighting device, and more particularly to a lighting device that uses an LED (Light Emitting Diode) as a light source. [Background technology]

[0002] In recent years, efforts have been made to use LEDs as light sources in lighting devices that are installed in poor temperature environments such as urban areas and underground tunnels in urban areas in order to achieve energy savings and longer lifespans (see, for example, Patent Documents 1 to 4). Generally, when installing lighting devices in tunnels, the installation intervals and other factors are set with reference to the optical characteristics of the lighting devices.

[0003] The optical characteristics of a straight-tube lighting device with a tube axis (lamp axis) are expressed by the light distribution characteristics in the AA plane perpendicular to the tube axis (hereinafter referred to as the "AA light distribution characteristics"), the light distribution characteristics in the BB plane including the tube axis (hereinafter referred to as the "BB light distribution characteristics"), and the light distribution characteristics in the CC plane tilted at 45 degrees to the AA and BB planes (hereinafter referred to as the "CC light distribution characteristics") (see Figure 1). In a lighting device equipped with an LED light source, the direction in which the LED elements are arranged is the tube axis.

[0004] FIG. 1 is a diagram showing an example of the light distribution characteristic of a straight-tube lighting device. When the lighting device shown in FIG. 1 is installed on a ceiling, its optical axis faces vertically downward. As shown in FIG. 1, generally, the luminous intensity decreases as the irradiation direction deviates from the vertical direction (0°). Furthermore, compared to the BB and CC light distribution characteristics, the AA light distribution characteristic has a smaller decrease in luminous intensity depending on the irradiation direction and a larger angular range (light distribution angle) over which a predetermined luminous intensity (e.g., 50% of the luminous intensity in the optical axis direction) can be obtained. Therefore, when multiple lighting devices having the light distribution characteristic shown in FIG. 1 are installed along the extension direction of a tunnel (hereinafter referred to as the "tunnel axis direction"), the lighting devices are installed so that the tube axis is perpendicular to the tunnel axis direction, and the AA light distribution characteristic with a larger light distribution angle is applied in the tunnel axis direction (see FIG. 2).

[0005] Furthermore, Patent Documents 1 to 4 disclose a lighting device in which two LED boards mounted with LED elements are arranged so that their optical axes intersect with each other. In such a lighting device, the light distribution angle in the AA light distribution characteristic is larger than when the optical axes are directed vertically downward. Therefore, this is useful when it is desired to efficiently ensure a predetermined brightness along the tunnel axis direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-51193 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-43558 [Patent Document 3] Patent No. 7179921 [Patent Document 4] Patent No. 7194782 Summary of the Invention [Problem to be solved by the invention]

[0007] In the lighting devices disclosed in Patent Documents 1 to 4, the angle of the optical axis direction of the LED element is basically considered to be the peak angle of the AA light distribution. Therefore, the optical axis direction of the LED element, i.e., the board mounting angle of the LED board, is designed based on the target peak angle of the AA light distribution (hereinafter referred to as the "target peak angle").

[0008] However, when the substrate mounting angle of the LED substrate is designed to match the target peak angle, the actual peak angle may not match the target peak angle.

[0009] An object of the present invention is to provide a lighting device that can easily match the actual peak angle in the AA light distribution characteristic with the target peak angle and can increase illuminance over a wide range in the tunnel axis direction. [Means for solving the problem]

[0010] The lighting device according to the present invention comprises: A straight tube lighting device that is installed on the installation surface of a culvert and irradiates light to the opposite side of the installation surface, A plurality of LED elements; Two LED substrates on which a plurality of the LED elements are arranged along the tube axis direction and arranged such that non-mounting surfaces of the LED elements face each other; a translucent protective tube that houses the LED substrate; The LED substrate has a first substrate portion on which the LED elements are mounted, and a second substrate portion formed by bending the first substrate portion at a predetermined substrate bending angle θ1, The substrate bending angle θ1 is set to be 50°<θ1<90°, and is set to be larger than the target peak angle θ2 of the AA light distribution, taking into consideration the refraction of the light emitted from the LED element in the protective tube. And, When light from the LED element passes through the protective tube, it is refracted so that the actual light distribution peak angle is smaller than the target peak angle θ2, One of the LED substrates has a third substrate portion connected to the first substrate portion so as to be perpendicular to the second substrate portion, A phosphorescent material is disposed on both sides of the third substrate portion. . The lighting device according to the present invention comprises: A straight tube lighting device that is installed on the installation surface of a culvert and irradiates light to the opposite side of the installation surface, A plurality of LED elements; Two LED substrates on which a plurality of the LED elements are arranged along the tube axis direction and arranged such that non-mounting surfaces of the LED elements face each other; a translucent protective tube that houses the LED substrate; The LED substrate has a first substrate portion on which the LED elements are mounted, and a second substrate portion formed by bending the first substrate portion at a predetermined substrate bending angle θ1, the substrate bending angle θ1 is set to be 50°<θ1<90° and is set to be larger than the target peak angle θ2 of the AA light distribution, taking into consideration the refraction of the light emitted from the LED element in the protective tube; When light from the LED element passes through the protective tube, it is refracted so that the actual light distribution peak angle is smaller than the target peak angle θ2, A light-storing body is disposed on the second substrate portion. [Effects of the Invention]

[0011] According to the present invention, the actual peak angle in the AA light distribution characteristic can be easily made to match the target peak angle, and the illuminance can be increased over a wide range in the tunnel axis direction. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing an example of the light distribution characteristic of a straight-tube lighting device. [Figure 2] FIG. 2 is a diagram showing the relationship between the installation state of the lighting device and the illumination range in the tunnel. [Figure 3] 3A and 3B are diagrams showing the appearance of the lighting device according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing the internal structure of the lighting device according to the embodiment. [Figure 5] FIG. 5 is a cross-sectional view showing the internal structure of the lighting device according to the embodiment. [Figure 6] 6A and 6B are diagrams illustrating the light distribution peak angle of the lighting device. [Figure 7] FIG. 7 is a diagram showing the light distribution characteristics of the lighting device. [Figure 8] FIG. 8 is a diagram showing an example of the relationship between the substrate bending angle and the light distribution peak angle. [Figure 9] FIG. 9 is a diagram showing an example of the relationship between the board bending angle and the minimum and average illuminance on the floor surface. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0014] 3A and 3B are diagrams showing the appearance of the lighting device 1 according to the embodiment. FIG. 3A is a front view of the lighting device 1, showing the state where it is attached to an installation surface C. FIG. 3B is a plan view of the lighting device 1 as seen from the installation surface C side. FIGS. 4 and 5 are cross-sectional views showing the internal structure of the lighting device 1. FIG. 4 is a schematic cross-section perpendicular to the tube axis of the lighting device 1. FIG. 5 is a schematic vertical cross-section parallel to the tube axis of the lighting device 1.

[0015] The lighting device 1 is installed, for example, on an installation surface C of a culvert such as a tunnel or passageway, and irradiates light on the side opposite the installation surface C. The lighting device 1 is installed, for example, on the ceiling of a tunnel extending horizontally, and irradiates light vertically downward on the side opposite the installation surface C. The lighting device 1 is, for example, a waterproof lighting device, and complies with JIS C 0920 IPX7.

[0016] The lighting device 1 includes a light source unit LU, a power supply unit PU, a protective body 30, etc. The light source unit LU and the power supply unit PU are housed inside the protective body 30. The LED boards 10A, 10B of the light source unit LU are electrically connected to a power supply circuit board 21 of the power supply unit PU, and power is supplied from the power supply unit PU to the light source unit LU. The power supply unit PU is also connected to a power cable 41 inside the protective body 30, and power is supplied from an external power source via the power cable 41.

[0017] The protector 30 includes a protective tube 31 , and holding cases 32 and 33 and sealing caps 34 and 35 disposed on both ends of the protective tube 31 .

[0018] The protective tube 31 is, for example, a translucent cylindrical member made of a light-transmitting material such as glass or resin. "Translucent" includes milky white and semi-milky white. The protective tube 31 can be made of, for example, polycarbonate resin. Both ends of the protective tube 31 are closed by holding cases 32 and 33 and sealing caps 34 and 35. The protective tube 31 transmits part of the light emitted from the LED elements 15A and 15B and reflects the rest.

[0019] The holding cases 32 and 33 are cylindrical and made of a resin material such as ABS resin. Similarly, the sealing caps 34 and 35 are bowl-shaped and made of a resin material such as ABS resin. The holding cases 32 and 33 and the sealing caps 34 and 35 are preferably made of a thermally conductive material.

[0020] The retaining cases 32 and 33 are fitted onto both ends of the protective tube 31, for example, and are fixed to the protective tube 31 by tightening the fastening rings 36 and 37 from the axial center side. Sealing members (not shown) such as O-rings are arranged between the retaining cases 32 and 33 and the fastening rings 36 and 37 to ensure watertightness.

[0021] Hanging arms 32a, 33a are provided to protrude outward from parts of the outer periphery of the holding cases 32, 33. The hanging arms 32a, 33a are fastened to fixing pieces 51a of the flat chassis 51 with fastening members (reference numeral omitted), such as screws. When the chassis 51 is fixed to the installation surface C of the ceiling of the tunnel, the lighting device 1 is held in a suspended state from the ceiling via the hanging arms 32a, 33a.

[0022] The sealing caps 34, 35 are fastened to, for example, the holding cases 32, 33. Sealing members (not shown) such as O-rings are arranged between the sealing caps 34, 35 and the holding cases 32, 33 to ensure watertightness. One of the sealing caps 34 is provided with a cable insertion portion 42 through which a power cable 41 is pulled. The power cable 41 is pulled into the protective tube 31 through the cable insertion portion 42 and connected to the power supply unit PU.

[0023] Heat dissipation plates 38, 39 are fitted into the holding cases 32, 33. Specifically, the heat dissipation plates 38, 39 are fastened by screws to mounting pieces 32c, 33c that are integral with the holding cases 32, 33, so that heat is dissipated from the power supply circuit board 21 via the heat dissipation plates 38, 39 and the holding cases 32, 33. The heat dissipation plates 38, 39 are disk-shaped and made of a thermally conductive material such as anodized aluminum. The shape of the heat dissipation plates 38, 39 is not limited to disk, and they may have any shape, such as rectangular or elliptical, as long as they can be fastened to the mounting pieces 32c, 33c.

[0024] The power supply unit PU has a power supply circuit board 21 and a power supply module 22 mounted on the power supply circuit board 21. The power supply circuit board 21 is electrically connected to a power cable 41 and the LED boards 10A, 10B. The power supply module 22 may be any power supply module that can supply power to the LED elements 15A, 15B mounted on the LED boards 10A, 10B, and may be formed, for example, by a DC power supply circuit.

[0025] The power supply unit PU is held in a predetermined position by joining the power supply circuit board 21 to the heat dissipation plates 38, 39. The power supply unit PU is held in a position where, for example, the power supply circuit board 21 and the chassis 51 are parallel to each other. In other words, when the lighting device 1 is installed on an installation surface C, the power supply circuit board 21 is parallel to the installation surface C. The power supply circuit board 21 and the heat dissipation plates 38, 39 are joined via a thermally conductive joining means or joining member, such as welding or fastening with screws.

[0026] The light source unit LU has two LED substrates 10A and 10B. The LED substrates 10A and 10B are printed wiring boards on which power lines to the LED elements 15A and 15B are formed. The LED substrates 10A and 10B are arranged to extend along the axial direction of the lighting device 1. The LED substrates 10A and 10B are elongated substrates with a substantially L-shaped cross section, and are partitioned by a bent portion into LED mounting substrate portions 11A and 11B (first substrate portions) and fixed substrate portions 12A and 12B (second substrate portions).

[0027] The LED mounting substrate units 11A, 11B and the fixed substrate units 12A, 12B are formed, for example, by bending a single printed wiring board at a substrate bending angle θ1. The angle between the optical axes 14A, 14B and the vertical direction is the same as the substrate bending angle θ1 of the LED substrates 10A, 10B (see FIG. 6B). Furthermore, the substrate mounting angle θs, which is the angle between the LED mounting substrate units 11A, 11B and the fixed substrate units 12A, 12B, is expressed as 180°-θ1 using the substrate bending angle θ1.

[0028] A plurality of LED elements 15A, 15B are linearly arranged on the LED mounting substrate portions 11A, 11B, respectively. The arrangement direction of the LED elements 15A, 15B coincides with the tube axis of the lighting device 1. The LED elements 15A, 15B may be arranged in a single row, or may be arranged two-dimensionally in multiple rows.

[0029] The optical axes of the multiple LED elements 15A, 15B mounted on each of the LED mounting substrates 11A, 11B are the same and typically perpendicular to the LED mounting surfaces. The LED mounting substrates 11A, 11B are arranged so that their LED mounting surfaces face opposite each other in a vertical cross section along the tube axis of the lighting device 1, i.e., so that the LED elements 15A, 15B mounted on the LED mounting substrates 11A, 11B illuminate different regions. In other words, the LED mounting substrates 11A, 11B are arranged so that the non-mounted surfaces of the LED elements 15A, 15B face each other.

[0030] The LED mounting substrate units 11A and 11B are disposed at an incline relative to the fixed substrate units 12A and 12B. Specifically, the LED mounting substrate units 11A and 11B are disposed so that their open ends on the opposite side from the power supply circuit board 21 (the fixed substrate units 12A and 12B) approach each other. The fixed substrate units 12A and 12B are fixed parallel to the power supply circuit board 21 and thus to the chassis 51, and therefore the LED mounting substrate units 11A and 11B can be said to be disposed at an incline relative to the installation surface C. In addition, in a cross section perpendicular to the tube axis of the lighting device 1, the optical axes of the LED elements 15A and 15B can be said to intersect each other. The LED substrates 10A and 10B are disposed symmetrically with respect to, for example, a vertical section along the tube axis of the lighting device 1.

[0031] The fixed substrate portions 12A and 12B are fixed to the power supply circuit board 21 via spacers 23. The LED substrates 10A and 10B are held in an orientation in which the fixed substrate portions 12A and 12B are parallel to the power supply circuit board 21. That is, in this embodiment, the power supply circuit board 21 functions as a support that supports the light source unit LU with respect to the protector 30.

[0032] The light source unit LU is held in a suspended state on the power supply circuit board 21. A space is formed between the power supply circuit board 21 and the LED boards 10A, 10B (fixed board portions 12A, 12B). This allows the heat generated when the LED elements 15A, 15B are driven to be dissipated efficiently.

[0033] Furthermore, light source unit LU has phosphorescent bodies 71 and 72 that emit light even when LED elements 15A and 15B are not irradiating light, such as during a power outage or when the power is off. Phosphorescent bodies 71 and 72 mainly absorb light emitted from LED elements 15A and 15B that is reflected by protective tube 31 and store the light as energy. There are no particular limitations on the mounting configuration of phosphorescent bodies 71 and 72, as long as they are placed in an area that does not obstruct the light emitted from LED elements 15A and 15B.

[0034] The light-accumulating body 71 is disposed, for example, protruding from the LED mounting substrate portions 11A and 11B. Specifically, one LED substrate 10B has a light-accumulating body attachment portion 13B (third substrate portion) connected to the LED mounting substrate portion 11B so as to be perpendicular to the fixed substrate portion 12B. The light-accumulating body 71 is disposed on both sides of the light-accumulating body attachment portion 13B. The light emitted from the LED elements 15A and 15B is not obstructed by the light-accumulating body 71. Light can be efficiently stored in the light-accumulating body 71, and visibility can be improved by the phosphorescence of the light-accumulating body 71.

[0035] The phosphorescent body 72 is disposed on one surface of the fixed substrate portions 12A and 12B. The surface on which the phosphorescent body 72 is disposed is the same side as the LED mounting surfaces of the LED-mounting substrate portions 11A and 12A. The light emitted from the LED elements 15A and 15B is not obstructed by the phosphorescent body 72. By providing the phosphorescent body 72, the visible range (visible angle) is expanded, and the phosphorescence of the phosphorescent body 72 further improves visibility.

[0036] The light-accumulating bodies 71, 72 have a flat plate shape and have a length in the tube axis direction equal to that of the LED substrates 10A, 10B. The light-accumulating bodies 71, 72 extend along the tube axis direction and are arranged so that the flat plate-shaped main surfaces face the illumination side of the LED elements 15A, 15B. This allows the light reflected by the protective tube 31 to be efficiently received and stored.

[0037] The luminous bodies 71 and 72 are formed, for example, by moldings made of a luminous material. Known luminous materials such as strontium aluminate can be used as the luminous material. In this case, the luminous energy can be easily increased simply by increasing the volume of the luminous bodies 71 and 72. Therefore, compared to luminous bodies in which a luminous sheet is attached to the surface of a base material or in which luminous paint is applied, the luminous duration can be extended and the phosphorescence brightness is also increased, improving visibility.

[0038] The phosphorescent bodies 71 and 72 are attached to the phosphorescent body attachment part 13B and the fixed substrate parts 12A and 12B by, for example, heat-resistant adhesive tape (not shown).

[0039] In the lighting device 1, the optical axis directions of the LED elements 15A and 15B are inclined relative to the vertical and horizontal directions, so that the AA light distribution characteristics of the lighting device 1 provide a predetermined luminous intensity over a wide range (see FIG. 7). Therefore, by installing the lighting device 1 on the ceiling of the tunnel so that the tube axis is perpendicular to the tunnel axis direction, i.e., so that the AA light distribution is applied in the tunnel axis direction, it is possible to illuminate a wide area in the tunnel axis direction. Furthermore, when multiple lighting devices 1 are installed at predetermined intervals in the tunnel axis direction, the number of lighting devices 1 can be reduced, thereby reducing facility construction costs. Furthermore, sufficient brightness can be ensured even at points away from the lighting device 1 (for example, intermediate point P1 (see FIG. 6A)).

[0040] In particular, when two adjacent lighting devices 1 are installed so that their optical axis directions intersect near midpoint P1, it is possible to maximize the distance L between the lighting devices 1. For example, if the peak angle θp of the AA light distribution of the lighting device 1 is 75° and the installation height H of the lighting device 1 is 2.1 m, the lighting device 1 should be installed at a point that is a horizontal distance from the lighting device 1 of approximately 8 m (= 2.1 × tan 75°) as the midpoint P1.

[0041] Basically, the peak angle θp of the AA light distribution is considered to coincide with the angle θ1 of the optical axis direction of the LED elements 15A and 15B, i.e., the substrate bending angle θ1. Therefore, in conventional lighting devices, the optical axis direction of the LED elements 15A and 15B, i.e., the substrate bending angle θ1 of the LED substrates 10A and 10B, is designed based on the target peak angle θ2 of the AA light distribution (θ1 = θ2). However, the inventors' investigations revealed that the actual light distribution peak angle θp can deviate from the target peak angle θ2, and that a design method that equates the substrate bending angle θ1 with the target peak angle θ2 may not result in desired light distribution characteristics.

[0042] FIG. 8 is a diagram showing an example of the relationship between the substrate bending angle θ1 and the actual light distribution peak angle θp. As shown in FIG. 8, when there is no protective tube 31, the substrate bending angle θ1 and the actual light distribution peak angle θp agree well. This indicates that the desired light distribution characteristics can be obtained by setting the substrate bending angle θ1 to be the same as the target peak angle θ2. Although not shown in FIG. 8, even when there is a protective tube 31, if the protective tube 31 is transparent, the same results as when there is no protective tube 31 were obtained.

[0043] On the other hand, when protective tube 31 is present, substrate bending angle θ1 and actual light distribution peak angle θp do not match, and light distribution peak angle θp is 10 to 15° smaller than substrate bending angle θ1. In other words, actual light distribution peak angle θp is 10 to 15° smaller than target peak angle θ2, and the desired light distribution characteristics are not obtained. This is thought to be because, in the case of semi-transparent (for example, milky white or semi-milky) protective tube 31, the light path is disrupted when light emitted from LED elements 15A and 15B passes through protective tube 31, so that the angle of incidence and the angle of emission of the light are not the same, resulting in refraction.

[0044] Therefore, in this embodiment, the substrate bending angle θ1 is set to be larger than the target peak angle θ2 of the AA light distribution, taking into account the refraction of light emitted from LED elements 15A and 15B in protective tube 31. Specifically, the substrate bending angle θ1 is set to satisfy θ2 + 10° ≦ θ1 ≦ θ2 + 15°. This makes it possible to easily match the actual light distribution peak angle θp of the AA light distribution with the target peak angle θ2, thereby achieving an illumination device 1 with desired light distribution characteristics (target peak angle θ2).

[0045] In this embodiment, the substrate bending angle θ1 of the LED substrates 10A and 10B is set to satisfy the relationship 50°<θ<90°. FIG. 9 is a diagram showing an example of the relationship between the substrate bending angle θ1 and the minimum and average floor illuminance. FIG. 9 shows the minimum and average illuminance when two lighting devices 1 are installed on the ceiling of a tunnel with a luminaire spacing of 16 m. The minimum and average illuminances shown in FIG. 9 are simulation results when the tunnel width is 2.1 m, the height from the lighting devices 1 to the floor is 2.1 m, the maintenance factor is 0.7, and the reflectance is 1.4. The minimum floor illuminance is, for example, the illuminance at the midpoint P1 between the two lighting devices 1 (see FIG. 6A).

[0046] Generally, for walkability, the minimum floor illuminance must be 2.25 lx or greater. Figure 9 shows that when the board bending angle θ1 of the lighting device 1 is greater than 50°, the minimum floor illuminance is 2.25 lx or greater. When the board bending angle θ1 is 50° or less, the peak angle θp in the AA light distribution approaches 0°, which is thought to be because the lighting device 1 faces almost vertically downward when installed on a ceiling. Furthermore, the average illuminance required for short-term, very rough outdoor work is 10 lx (JIS Z 9110:2010). Figure 9 also shows that when the board bending angle θ1 of the lighting device 1 is less than 90°, the average illuminance is 10 lx or greater. Therefore, it is preferable that the board bending angle θ1 of the LED boards 10A and 10B satisfy the relationship 50°<θ1<90°.

[0047] As described above, the lighting device 1 according to the embodiment has the following characteristics. That is, the lighting device 1 according to the embodiment is a straight-tube lighting device that is installed on an installation surface C of a culvert and irradiates light in a direction opposite to the installation surface C, and includes a plurality of LED elements 15A, 15B, two LED substrates 10A, 10B on which the plurality of LED elements 15A, 15B are arranged along the tube axis direction and arranged so that non-mounting surfaces of the LED elements 15A, 15B face each other, and a translucent (e.g., milky white or semi-milky) protective tube 31 that houses the LED substrates 10A, 10B, and the LED substrates 10A, 10B have LED mounting substrate units 11A, 11B (first substrate units) on which the LED elements 15A, 15B are mounted, and fixed substrate units 12A, 12B (second substrate units) that are formed by bending the LED mounting substrate units 11A, 11B at a predetermined substrate bending angle θ1. The substrate bending angle θ1 is set to be 50°<θ1<90° and is larger than the target peak angle θ2 of the AA light distribution, taking into consideration the refraction in protective tube 31 of the light emitted from LED elements 15A and 15B.

[0048] Specifically, in the lighting device 1, the substrate bending angle θ1 satisfies θ2+10°≦θ1≦θ2+15°.

[0049] The lighting device 1 can easily match the actual light distribution peak angle θp of the AA light distribution with the target peak angle θ2, thereby realizing a lighting device with the desired light distribution characteristics (target peak angle θ2). Furthermore, by installing the lighting device 1 so that light can be irradiated on both sides of the tube axis and the tube axis is perpendicular to the duct axis direction, the illuminance can be increased over a wide range in the duct axis direction.

[0050] In the lighting device 1, the protective tube 31 is made of polycarbonate. In this case, the refraction of the light emitted from the LED elements 15A and 15B in the protective tube 31 becomes significant, but by setting the substrate bending angle θ1 as described above, the actual light distribution peak angle θp of the AA light distribution can be easily made to coincide with the target peak angle θ2.

[0051] In the lighting device 1, one LED substrate 13B has a phosphorescent body attachment section 13B (third substrate section) connected to the LED mounting substrate section 11B (first substrate section) so as to be perpendicular to the fixed substrate section 12B (second substrate section), and phosphorescent bodies 71 are arranged on both sides of the phosphorescent body attachment section 13B. This allows the phosphorescent body 71 to be easily arranged, and allows the phosphorescent body 71 to store light without interfering with the irradiation of light from the LED elements 15A and 15B. Therefore, the phosphorescent body 71 can store light efficiently, and visibility due to the phosphorescence of the phosphorescent body 71 can be improved, making it suitable as a good visibility sign when the light is off.

[0052] Furthermore, in the lighting device 1, the light accumulating body 72 is disposed on the fixed substrate portions 12A and 12B (second substrate portions). This allows the light accumulating body 72 to be easily disposed, allows light to be stored in the light accumulating body 72 without impeding the irradiation of light from the LED elements 15A and 15B, and also increases the light-emitting area of ​​the light accumulating body 72. Therefore, the visibility due to the phosphorescence of the light accumulating bodies 71 and 72 is further improved.

[0053] The invention made by the inventor has been specifically described above based on an embodiment, but the present invention is not limited to the above embodiment and can be modified within the scope of the gist thereof.

[0054] For example, a luminous sheet containing a luminous material attached to the surface of a resin or metal substrate, or a luminous paint applied thereto, may be used as the luminous bodies 71, 72. In addition to the luminous bodies 71, 72, the holding cases 32, 33 and / or the sealing caps 34, 35 may also have luminous properties.

[0055] Furthermore, for example, in the lighting device 1, a heat sink may be attached to the power supply circuit board 21 via a spacer 23, and the fixed substrate portions 12A and 12B of the LED boards 10A and 10B may be fixed to this heat sink. In this case, the heat sink is joined to the heat sink plates 38 and 39, rather than the power supply circuit board 21, and functions as a support for supporting the light source unit LU. The heat sink is formed of, for example, a metal material such as aluminum that has thermal conductivity.

[0056] The heat generated when the LED elements 15A, 15B are driven is transmitted as a heat flow through the heat sink and is efficiently dissipated to the outside via the heat dissipation plates 38, 39 and the holding cases 32, 33. This alleviates the restrictions imposed by the heat generated by the LED elements 15A, 15B when driven, making it possible to increase the number of mounted LED elements and the driving power, making it easier to accommodate a high-brightness design for the lighting device 1. Furthermore, the high-brightness design of the lighting device 1 increases the amount of light incident on the phosphorescent elements 71, 72, and extends the duration of phosphorescence, making it suitable for use as an evacuation guide light.

[0057] Although the embodiment has been described with reference to a case where the lighting device 1 is installed on the ceiling of a tunnel, the lighting device 1 may also be installed on a side wall of the tunnel. Furthermore, in a tunnel that extends vertically, the lighting devices 1 may be installed at predetermined intervals in the vertical direction.

[0058] Furthermore, the substrate bending angle θ1 of the two LED substrates 10A, 10B may be the same or different. Furthermore, the substrate bending angle θ1 may be variable by, for example, connecting the LED mounting substrate portions 11A, 11B and the fixed substrate portions 12A, 12B via a hinge structure. In this case, the illumination range of the lighting device in the tunnel axis direction is variable, so the required brightness can be easily ensured by adjusting the substrate bending angle θ1 depending on, for example, the number of lighting devices that can be installed. Furthermore, the illumination range can also be changed after the lighting device is installed.

[0059] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0060] 1. Lighting equipment 10A, 10B LED board 11A, 11B LED mounting board section (first board section) 12A, 12B Fixed board part (second board part) 13B Luminous body mounting part (third board part) 15A, 15B LED elements 31 Protection tube 71, 72 Luminous body

Claims

1. A straight tube lighting device that is installed on the installation surface of a culvert and irradiates light to the opposite side of the installation surface, A plurality of LED elements; two LED substrates on which a plurality of the LED elements are arranged along the tube axis direction, and which are arranged such that non-mounting surfaces of the LED elements face each other; a translucent protective tube that houses the LED substrate; The LED substrate has a first substrate portion on which the LED elements are mounted and a second substrate portion formed by bending the first substrate portion at a predetermined substrate bending angle θ1, the substrate bending angle θ1 is set to be 50°<θ1<90° and is set to be larger than a target peak angle θ2 of the A-A light distribution in consideration of refraction of light emitted from the LED element in the protective tube; When the light from the LED element passes through the protective tube, the light is refracted so that the actual light distribution peak angle is smaller than the target peak angle θ2, One of the LED substrates has a third substrate portion connected to the first substrate portion so as to be perpendicular to the second substrate portion, A phosphorescent body is disposed on both sides of the third substrate portion. Lighting equipment.

2. A straight tube lighting device that is installed on the installation surface of a culvert and irradiates light to the opposite side of the installation surface, A plurality of LED elements; two LED substrates on which a plurality of the LED elements are arranged along the tube axis direction, and which are arranged such that non-mounting surfaces of the LED elements face each other; a translucent protective tube that houses the LED substrate; The LED substrate has a first substrate portion on which the LED elements are mounted and a second substrate portion formed by bending the first substrate portion at a predetermined substrate bending angle θ1, the substrate bending angle θ1 is set to be 50°<θ1<90° and is set to be larger than a target peak angle θ2 of the A-A light distribution in consideration of refraction of light emitted from the LED element in the protective tube; When the light from the LED element passes through the protective tube, the light is refracted so that the actual light distribution peak angle is smaller than the target peak angle θ2, A light-storing body is disposed on the second substrate portion. Lighting equipment.

3. The substrate bending angle θ1 satisfies θ2+10°≦θ1≦θ2+15°, 3. The lighting device according to claim 1 or 2.

4. The protective tube is made of polycarbonate.

3. The lighting device according to claim 1 or 2.

5. A light-storing body is disposed on the second substrate portion. The lighting device according to claim 1 .

Images