JP2023002181A - Cover for lamp, lamp and lighting device - Google Patents

Abstract

To provide a cover for a lamp for a lighting device that is less likely to generate shear stress, and is suitable for use under a special environment or an outdoor environment, a lamp, and a lighting device.SOLUTION: A cover for a lamp covering a light source part having a light source, comprises a first translucent resin layer, and a second translucent resin layer laminated on the outer wall surface side outside the first resin layer when viewed from the light source. The second resin layer is made of a material having a Young's modulus smaller than that of the first resin layer.SELECTED DRAWING: Figure 3

Description

This technology relates to a lamp cover, a lamp, and a lighting device. In particular, it relates to improving the reliability of a cover that covers a light source.

Lighting devices have a wide range of uses. For this reason, lighting devices are sometimes used even in special or outdoor environments. The special environment is, for example, a coastal area that is always exposed to high humidity wind, a factory that is chronically filled with a certain kind of gas, and a food or fresh flower storage that maintains high humidity. In such an environment, there is lighting installation in which switching between lighting and non-lighting is frequently performed based on detection by a human sensor or the like. Naturally, lighting devices required for such places are required to be resistant to the environment in which they are installed, and to have durability that does not cause damage even if lighting and non-lighting are repeated frequently. .

2. Description of the Related Art In a lighting fixture having a light source of a lighting device, a material having translucency is used for the outer shell of a cover that covers the light source because of its function. In recent years, as light sources have changed from incandescent lamps or fluorescent lamps to LEDs, translucent materials have changed from glass to resin for the purpose of safety and weight reduction. Further, there has been proposed a device provided with a lamp cover having a structure in which a material made of an acrylic resin or an arylate resin is laminated on a resin such as a polycarbonate resin (see Patent Document 1, for example). In this way, in the lamp cover, by coating or two-color molding at least one of acrylic, fluorine, and silicone resin materials on the base resin, water resistance and sunlight resistance can be achieved. and improved chemical resistance.

JP 2017-123259 A

As described above, the coating or two-color molded cover for lamps as disclosed in Patent Document 1 takes water resistance, sunlight resistance, chemical resistance, gas barrier property, and the like into consideration as described above. However, in the lamp cover disclosed in Patent Document 1, the resin that forms the first resin layer and the resin laminated on the first resin layer by coating or two-color molding have different coefficients of thermal expansion. Due to the difference in coefficient of thermal expansion between the resin of the first resin layer and the laminated resin, a shear stress is generated in the lamp cover due to the difference in linear expansion, which may lead to shear failure of the lamp cover.

Therefore, in view of the above problems, it is an object of the present invention to provide a lamp cover for a lighting device, a lamp, and a lighting device that are less susceptible to shear stress and suitable for use in special environments or outdoor environments.

A lamp cover according to the present disclosure is a lamp cover that covers a light source section having a light source, and includes a translucent first resin layer and an outer wall surface that is outside the first resin layer when viewed from the light source. and a laminated second resin layer having translucency, and the second resin layer is made of a material having a Young's modulus smaller than that of the first resin layer.

Further, a lamp according to this disclosure includes the lamp cover described above and a light source section having a light source.

Further, a lighting device according to the present disclosure includes the lighting device described above and a lighting device having a mounting portion to which the lighting device is mounted.

According to the lamp cover and the like according to this disclosure, the second resin layer is laminated on the outside of the first resin layer when viewed from the light source. The Young's modulus of the material of the second resin layer is smaller than the Young's modulus of the material of the first resin layer. Therefore, the lamp cover of the lamp can reduce the difference in the amount of expansion and contraction between the first resin layer and the second resin layer caused by the heat generated by the light source. It can reduce shear stress and prevent shear failure. Therefore, it is possible to obtain a highly reliable lamp cover or the like.

1 is a perspective view of lighting device 1 according to Embodiment 1. FIG. FIG. 2 is a perspective view showing division of the lighting fixture 2 and lamp fixture 3 of the lighting device 1 according to Embodiment 1; 2 is a diagram showing a vertical cross section of lighting device 1 orthogonal to the longitudinal direction of lighting device 1 according to Embodiment 1. FIG. 1 is a perspective view of a lighting fixture 3 according to Embodiment 1. FIG. 4A and 4B are diagrams showing an example of a material of the lamp cover 30 according to Embodiment 1. FIG. 3 is an exploded perspective view of one end of the lamp 3 according to Embodiment 1. FIG. FIG. 10 is a diagram showing a vertical cross section of a lamp cover 30 orthogonal to the longitudinal direction of the lighting device 1 according to Embodiment 2;

Hereinafter, a lamp cover, a lamp, and a lighting device according to embodiments will be described with reference to the drawings. The same or corresponding components in each drawing are denoted by the same reference numerals, and repeated description may be omitted.

Here, the content is not limited by the embodiment described below. In addition, in the following drawings, the size relationship of each component may differ from the actual size. In addition, in the description of the embodiments, directions or positions such as up, down, left, right, front, back, front or back may be indicated. These notations are for the convenience of explanation, and do not limit the arrangement, direction, and orientation of devices, instruments, parts, and the like.

Embodiment 1.
<Configuration of lighting device 1>
FIG. 1 is a perspective view of a lighting device 1 according to Embodiment 1. FIG. Also, FIG. 2 is a perspective view showing the division of the lighting device 2 and the lighting device 3 of the lighting device 1 according to the first embodiment. FIG. 3 is a diagram showing a vertical cross section of lighting device 1 perpendicular to the longitudinal direction of lighting device 1 according to Embodiment 1. As shown in FIG. The configuration of a lighting device 1 according to Embodiment 1 will be described with reference to FIGS. 1 to 3. FIG.

Here, in the following description, the direction along the longitudinal direction of the lighting device 1 is defined as the longitudinal direction X. As shown in FIG. In addition, a transverse direction Y is defined as a transverse direction perpendicular to the longitudinal direction X. As shown in FIG. A vertical direction Z is a direction perpendicular to both the longitudinal direction X and the lateral direction Y. As shown in FIG. In addition, in the longitudinal direction X, the direction toward the longitudinal ends is defined as an end direction X1. The direction to the side opposite to the end direction X1 and the direction to the longitudinal center side is defined as the inward direction X2. Furthermore, in the vertical direction Z, the direction toward the construction portion 9 side (ie, the ceiling or wall side) to which the lighting device 1 is attached is defined as an upward direction Z1. The direction opposite to the upward direction Z1, and the direction toward the irradiation space where light is emitted from the lighting device 1, is defined as the downward direction Z2. Here, the upward direction Z1 is the direction in which the lighting device 3 is attached to the lighting device 2, and the downward direction Z2 is the direction in which the lighting device 3 is removed from the lighting device 2. FIG.

A lighting device 1 according to Embodiment 1 has a lighting fixture 2 attached to a construction portion 9 such as a ceiling or a wall and a lighting fixture 3 attached to the lighting fixture 2 . In Embodiment 1, a so-called trough-type lighting fixture 2 is shown as an example.

<Lighting fixture 2>
The luminaire 2 serves as an attached portion to which the lamp 3 is attached. The lighting fixture 2 has a fixture body 20 . In the first embodiment, the device body 20 is formed by bending a metal plate. The instrument body 20 has an instrument bottom portion 21 , a pair of instrument side portions 22 and a pair of instrument end portions 23 . The instrument bottom part 21 is formed in a long and flat plate shape, and two instrument side parts 22 are arranged at both ends in the short direction Y of the instrument bottom part 21 . Moreover, the instrument end portions 23 that form a set of two are arranged at both ends in the longitudinal direction X of the instrument bottom portion 21 . A knockout 24 is formed in the instrument end 23, and is removed when various electric wires such as the power supply wire 81 are inserted in a wiring member 85, which will be described later. The configuration and the like of the lighting fixture 2 will be further described.

The mounting portion 25 is a housing portion that houses a portion of the mounted lamp 3 . The mounting portion 25 is formed in a concave shape by the device bottom portion 21 of the device main body 20, the set of device side portions 22, and the set of device end portions 23. As shown in FIG. Therefore, the mounting portion 25 forms a space surrounded by the device bottom portion 21 of the device main body 20 , the set of device side portions 22 and the set of device end portions 23 . Here, a part of the lamp 3 accommodated in the mounting portion 25 is a non-irradiating portion that is not on the irradiation side. Further, as shown in FIGS. 2 and 3(a), the space of the mounting portion 25 in which the lamp 3 is accommodated and which is not occupied by the lamp 3 is a wiring member 85 or the like, which will be described later. 3, the wiring area 29 is arranged through which the wiring is connected to the terminal 3.

An open end 26 located at the lower end of the instrument body 20 is a portion of the instrument body 20 that is open. The open end portion 26 serves as a mounting opening for attaching and detaching the lamp 3 to and from the mounting portion 25 of the lighting fixture 2 . Connecting portions 27 are formed at both ends in the longitudinal direction X of the opening end portion 26 of the instrument body 20 . The lamp 3 is attached to the connecting portion 27 . In Embodiment 1, the connecting portion 27 is formed integrally with the instrument end portion 23, and is formed by bending from the open end portion 26 toward the inward direction X2 in the longitudinal direction X. As shown in FIG. A screw hole 28 formed in the connecting portion 27 is a hole into which a connecting screw 48 (to be described later) attached to the lamp 3 is screwed. The lamp 3 is screwed and fixed to the lighting fixture 2 with a connecting screw 48 .

<Light fixture 3>
FIG. 4 is a perspective view of the lamp 3 according to Embodiment 1. FIG. Here, the lamp 3 will be described with reference to FIGS. 1 to 4. FIG. The lighting fixture 3 constitutes the lighting device 1 by being attached to the lighting fixture 2 . A lighting device and a lighting device 3 serving as a light source unit are formed in an elongated shape, and are used by being attached to the lighting device 2 . In Embodiment 1, the lighting fixture 3 is attached to the connecting portion 27 of the lighting fixture 2 at both ends in the longitudinal direction X of the lighting fixture 2 by connecting screws 48 described later. As shown in FIGS. 2 and 3A, the lamp 3 of Embodiment 1 mainly includes a lamp cover 30, an end cover 40, a light source section 60 serving as a light source, and the like.

<Lamp cover 30>
The lamp cover 30 that forms the outer shell of the lamp 3 is a cover that uses a translucent material that transmits at least visible light. The lamp cover 30 has a tubular shape, and accommodates and protects the mounting member 50, the light source section 60, the control section 80, etc., which will be described later, in the space inside the tube. The lamp 3 is attached to the lighting equipment 2 so that the cylinder axis of the lamp cover 30 extends along the longitudinal direction X. As shown in FIG. The lamp cover 30 is made of an amorphous resin material such as polycarbonate (PC), as will be described later. In addition, the portion of the lamp cover 30 that is exposed to the outside from the mounting portion 25 also serves as an appearance design portion.

In the lamp 3 of Embodiment 1, as shown in FIG. It becomes an outer shell portion serving as an outer wall portion that covers the surface of the pedestal 51 . Here, regarding the outer peripheral portion 37 of this portion, the direction of the normal to the outer surface portion is within the range from the direction along the optical axis of the light emitting element 61 to the direction orthogonal to the optical axis. For example, when the lighting device 3 is attached to the lighting device 2 so that light is emitted downward from the lighting device 1, the portion exposed to the outside from the mounting portion 25 of the lighting device cover 30 is the outer surface. oriented downward, obliquely downward, or laterally (horizontally outward). That is, the portion of the lamp cover 30 exposed to the outside from the mounting portion 25 does not face upward or obliquely upward. A portion of the lamp cover 30 that is housed in the mounting portion 25 and is not exposed to the outside covers the control portion 80 and the side of the mounting surface portion 52 of the pedestal 51 on which the control portion 80 is arranged. The surface of the portion of the lamp cover 30 that is housed in the mounting portion 25 and is not exposed to the outside faces the fixture bottom section 21 and the pair of fixture side sections 22 of the fixture main body 20 . Here, the lamp cover 30 may have light diffusing properties, wavelength discriminating properties, etc. according to product specifications and the like. In addition, the portion of the lamp cover 30 that is not exposed to the outside may be formed using a material having reflectivity, light shielding property, or the like.

As shown in FIGS. 1 to 4, the tubular lamp cover 30 according to Embodiment 1 covers the equipment housed inside, and is divided into a pair of parallel parts 31, It is divided into a first connection portion 32 and a second connection portion 33 . Two ribs 34 are provided on the lamp cover 30 . The pair of parallel portions 31 form surfaces of the lamp cover 30 that are parallel to each other at the same distance. In the pair of parallel portions 31 of the lamp cover 30, both the outer surface portion serving as the outer surface portion and the inner surface portion serving as the inner surface portion are both planar. The outer surface portion and the inner surface portion are planes along the optical axis of the light emitting element 61 accommodated in the lamp cover 30 . In Embodiment 1, this plane extends along the vertical direction Z when the lamp 3 is attached to the lighting fixture 2 . Furthermore, this plane is also a plane along which a pair of outer surface portions and a pair of inner surface portions are along fixture side sections 22 facing each other when the lamp 3 is attached to the lighting fixture 2 . This plane also serves as a plane along the direction in which the lighting device 3 is attached to the lighting device 2 or the direction in which it is removed from the lighting device 2 . Therefore, the parallel portion 31 of the lamp cover 30 is positioned inside the appliance side portion 22 rather than outside the appliance side portion 22 in the lateral direction Y. As shown in FIG. A portion of the parallel portion 31 that is exposed when the lamp 3 is attached to the lighting equipment 2 serves as an irradiation portion on the side of the lamp 3 .

The first connection portion 32 is a portion that connects the ends of the pair of parallel portions 31 on the irradiation side, intersects the optical axis of the light emitting element 61 , and serves as the main irradiation portion of the lamp 3 . The first connection portion 32 emits light downward from the light emitting element 61 . The outer surface portion and the inner surface portion of the first connecting portion 32 are composed of one or more surfaces. As shown in FIG. 3A, in Embodiment 1, the case where the outer surface and the inner surface of the first connecting portion 32 of the lamp cover 30 are formed of one curved surface will be described. Here, when the outer surface portion and the inner surface portion of the first connecting portion 32 are composed of a plurality of surfaces, a plurality of curved surfaces having different curvatures, a plurality of planes having different angles, and a combination of these curved surfaces and planes. can be configured in combination. The second connecting portion 33 is a portion that connects the fixture-side ends of the pair of parallel portions 31, and is a portion that is accommodated in the mounting portion 25 when the lamp 3 is mounted on the lighting fixture 2. be. In Embodiment 1, the case where the outer surface portion and the inner surface portion of the second connection portion 33 in the lamp cover 30 are configured by one curved surface will be described. Here, when the outer surface portion and the inner surface portion of the second connecting portion 33 are composed of a plurality of surfaces, a plurality of curved surfaces having different curvatures, a plurality of planes having different angles, and a combination of these curved surfaces and planes. can be configured in combination.

The rib 34 is provided so as to protrude in the normal direction of the outer surface of the lamp cover 30 . In Embodiment 1, the ribs 34 are provided in each parallel portion 31 so as to protrude outward. Each rib 34 is integrally formed with the parallel portion 31 . Each rib 34 extends in the longitudinal direction X of the lamp cover 30 . The rib 34 is formed at a position facing the vicinity of the open end 26 of the fixture side portion 22 when the lamp 3 is attached to the lighting fixture 2 .

In Embodiment 1, the lamp cover 30 can be divided into a first portion 300 and a second portion 301 in relation to the wiring member 85, as shown in FIG. 3(a). The first portion 300 of the lamp cover 30 is a portion of the lamp cover 30 with which the coating of the wiring material 85 may come into contact. Since it is preferable that the wiring member 85 is arranged in a region that does not block the light emitted from the lamp 3 , the first portion 300 is at least the portion of the lamp cover 30 that is positioned above the light emitting element 61 . becomes. The wiring region 29 of the wiring member 85 in the first embodiment is inside the mounting portion 25 . The first portion 300 is substantially a portion of the lamp cover 30 located above the rib 34 . Here, of the outer peripheral portion 37 of the lamp cover 30 , the outer peripheral portion of the first portion 300 that is accommodated inside the fixture body 20 is referred to as a first outer peripheral portion 370 .

A second portion 301 of the lamp cover 30 is a portion exposed from the fixture body 20 . Therefore, it is at least a portion below the light emitting element 61 . Therefore, in Embodiment 1, the portion substantially below the rib 34 is exposed to the outside and serves as the second portion 301 of the lamp cover 30 that is directly affected by the special environment. Here, the outer peripheral portion of the second portion 301 of the outer peripheral portion 37 of the lamp cover 30 is referred to as a second outer peripheral portion 371 .

The wiring member 85 has various wirings, such as the power supply line 81, the grounding line 82, and the control line 83, which are connected to the lamp fixture 3 from the outside. Terminals, wire holders, sockets, and the like for connecting these wires are also used as wiring members 85 . In FIG. 3A, the power line 81, the ground line 82 and the control line 83 connected to the lamp 3 are shown as a wiring member 85. FIG. The wiring members 85 may be arranged in the wiring area 29 in the mounting portion 25 in a state in which the wirings each covered with an insulating material are bundled together with a coating or bundled with a binding band. Moreover, each wiring may be arranged in the wiring area 29 in the mounting portion 25 in a state of being separated from each other.

<Details of the lamp cover 30>
Next, details such as the structure of the lamp cover 30 will be further described with reference to FIG. 3(b). The lamp cover 30 accommodates and protects the light source unit 60 which is a light source accommodated in the internal space. The lamp cover 30 having translucency that transmits at least visible light has a configuration in which a plurality of resin layers are laminated on the first resin layer 30A. As shown in FIG. 3B, the lamp cover 30 of Embodiment 1 has a second resin layer 30A on the outer wall surface side of the first resin layer 30A when viewed from the light source unit 60, which is a light source housed in the internal space. It is a structure in which two resin layers 30B are laminated. Therefore, in the lamp cover 30 of Embodiment 1, the second resin layer 30B, which is the outermost layer, is exposed to the external environment. For example, in factories with special environments, lighting devices are often installed in a semi-outdoor environment such as under the eaves or in a completely outdoor environment. Therefore, in the lamp 3 used in such an environment, the second resin layer 30B, which is the outermost layer, is required to have weather resistance including moisture absorption resistance, water resistance, or light resistance. Here, light resistance is a property including sunlight resistance.

The first resin layer 30A of Embodiment 1 requires a degree of hardness that can cover and protect the mounting member 50, the light source section 60, the control section 80, and the like accommodated in the internal space. Therefore, the first resin layer 30A has a thickness dimension T1 of 0.8 mm or more even at the thinnest part.

The second resin layer 30B is a layer made of a resin relatively superior in weather resistance to the first resin layer 30A. In addition, the second resin layer 30B has a Young's modulus E [10 ⁴ kg so that it can follow the expansion and contraction of the first resin layer 30A arranged at a position closer to the light source unit 60, which is a heat source, than the second resin layer 30B. /cm ² ] is preferably equal to or less than the first resin layer 30A. The second resin layer 30B needs to maintain the above performance while maintaining translucency. Therefore, it is desirable that the thickness dimension T2 of the second resin layer 30B is more than 0 [mm] and equal to or less than 0.8 [mm].

FIG. 5 is a diagram showing an example of the material of the lamp cover 30 according to the first embodiment. FIG. 5 shows the Young's modulus (longitudinal elastic modulus) and the coefficient of linear expansion [K] due to thermal expansion of each resin that is a material that realizes water resistance and light resistance. The coefficient of linear expansion represents the ratio between the initial dimension of an object and the amount of displacement due to thermal expansion per temperature of 1 [K].

The lamp cover 30 can be formed using an amorphous resin material such as polycarbonate resin (PC), acrylic resin (PMMA), or the like. Here, the Young's modulus E [10 ⁴ kg/cm ² ] of a typical material that can be used for the lamp cover 30 is the following material.
(1) Acrylic resin (PMMA): 2.5 to 3.5
(2) Polycarbonate resin (PC): 2.5
(3) Cycloolefin polymer resin (COP): 2.1 to 2.5

From the viewpoint of Young's modulus E, when the material of the first resin layer 30A is acrylic resin (PMMA), the material of the second resin layer 30B is polycarbonate resin (PC) or cycloolefin polymer resin (COP ) can be combined. Further, when the material of the first resin layer 30A is polycarbonate resin (PC), cycloolefin polymer resin (COP) can be combined as the material of the second resin layer 30B. Panlite (registered trademark) is a polycarbonate-based resin (PC) material that is effective in weather resistance. Further, Zeonor (registered trademark) is available as a material for the cycloolefin polymer resin (COP).

In the lamp cover 30 of Embodiment 1, the first resin layer 30A is formed into a cylindrical shape by, for example, extrusion molding or injection molding. Then, a coating or a film is applied to the first resin layer 30A by applying a resin or the like to form the second resin layer 30B. Alternatively, the second resin layer 30B may be formed by two-color molding using different materials. The formed lamp cover 30 is cut to a required length according to product specifications and the like.

Since the first resin layer 30A is close to the light source section 60 serving as a heat source, it is relatively susceptible to temperature changes associated with lighting and extinguishing of the lamp 3, and the amount of expansion and contraction increases. On the other hand, since the second resin layer 30B is in contact with the outside air, it is relatively less susceptible to temperature changes that occur when the lamp 3 is turned on and off. In the lamp cover 30 of Embodiment 1, the Young's modulus E of the second resin layer 30B farther from the light source section 60, which is a heat source, is higher than that of the first resin layer 30A closer to the light source section 60 than the second resin layer 30B. It is smaller than Young's modulus E. Therefore, the lamp cover 30 can reduce the shear stress caused by the difference in the amount of expansion and contraction between the first resin layer 30A and the second resin layer 30B, thereby preventing shear failure.

Here, in the lamp cover 30 of Embodiment 1, the second resin layer 30B is laminated on the entire outer wall surface of the cylindrical first resin layer 30A. However, it is not limited to this. For example, the second resin layer 30B may be laminated on a part of the first resin layer 30A, such as a part of the first resin layer 30A that becomes the second outer peripheral portion 371. For example, by not laminating the second resin layer 30B on a portion that is not exposed to the outside and is clearly not affected by the special environment, it is possible to eliminate waste such as the resin used as the material and the work process. Also, a plasticizer blocking portion that blocks the plasticizer may be provided in the first outer peripheral portion 370 . The plasticizer blocking portion suppresses or prevents the plasticizer from migrating to the lamp cover 30 when the wiring member 85 contains the plasticizer. The shape of the plasticizer blocking portion may be mesh-like, fabric-like, or the like. Materials such as metal materials such as aluminum, iron, stainless steel or copper, glass materials or ceramic materials can be used as materials for the plasticizer blocking portion.

FIG. 6 is an exploded perspective view of one end of the lamp 3 according to Embodiment 1. FIG. The lamp cover 30 covers the light emitting surface of the light emitting element 61 arranged on the mounting member 50, and has an opening formed at the end portion 36 in the first direction, which is the longitudinal direction X along the longitudinal direction of the mounting member 50. there is In other words, the lamp cover 30 is an elongated hollow body with at least one end 36 open, and accommodates the substrate 62 on which the light emitting element 61 is mounted. The cover end portions 35 are both end portions of the lamp cover 30 in the longitudinal direction X of the lamp cover 30 . A cover end portion 35 of the lamp cover 30 is provided with an end portion 36 . The end portion 36 is a portion to which the end cover 40 is fitted at the cover end portion 35 and is a portion covered with the end cover 40 which is an end lid. The end portion 36 is a free end that is movable along the first direction, which is the longitudinal direction X, along with the end portion cover 40 as the lamp cover 30 expands and contracts. Strictly speaking, the end portion 36 and the end portion cover 40 of the lamp cover 30 can expand and contract in directions other than the "longitudinal direction X". shall have a structure (configuration) that allows expansion and contraction in the "longitudinal direction X". The lamp cover 30 does not have ribs 34 formed on the outer surface of the end portion 36 so that it can be fitted with the end cover 40 . As described above, when the lamp cover 30 is manufactured by cutting a cylindrical member extruded by extrusion molding, the portion corresponding to the end portion 36 of the rib 34 extending in the longitudinal direction X is deleted. be done. As shown in FIGS. 3 and 6 , the outer peripheral portion 37 of the lamp cover 30 is the outer surface side of the outer shell portion that forms the pair of parallel portions 31 , first connecting portion 32 and second connecting portion 33 . In addition, the inner peripheral portion 38 is the inner surface side of the outer shell portion that forms the set of parallel portions 31 , the first connection portion 32 and the second connection portion 33 .

<Overview of end cover 40>
The end covers 40 are attached to both ends in the longitudinal direction X of the lamp cover 30 . The end cover 40 is fitted (fitted) with the sealing member 43 interposed therebetween, so that the lamp cover 30 has a closed structure. Here, the mounting member 50 and the lamp cover 30 attached to the end cover 40 are particularly resistant to changes in the operating environment temperature of the lighting device 1 and the temperature between when the lamp 3 is turned on and when the lamp 3 is turned off. The amount of expansion and contraction is different. The end cover 40 has a structure in which the end portions of the lamp cover 30 and the mounting member 50 in the longitudinal direction X are movable relative to each other while maintaining the sealing of the lamp cover 30 .

The end cover 40 has a first end cover 41 as an outer cover and a second end cover 42 as an inner cover. The first end cover 41 includes a first cover through hole 411, a first cover connecting hole 412, a connecting guide 413, a cover lower surface portion 414, a cover lower surface through hole 415, a cover wire holding portion 416, a cover end surface portion 417, and a cover end surface. It has a through hole 418 and an end cover perimeter 419 . Here, the cover lower surface through hole 415 is covered with the cover lid 49 as shown in FIG. Also, the second end cover 42 has a second cover main portion 420 , an end cover insertion portion 421 , a second cover engaging piece 422 , a second cover engaging claw 423 and an end cover inner peripheral portion 425 . Along the edge forming the end cover inserting portion 421, an inserting wall 421a is formed. Here, the first end cover 41 and the second end cover 42 of Embodiment 1 are described as being formed using a resin material. However, it is not limited to this. It may be formed using a metal material other than a resin material, a ceramic material, or the like. Further, in Embodiment 1, the first end cover 41 and the second end cover 42 are formed as separate members and integrated by fitting (fitting). You may make it shape|mold as one member.

<Sealing Tool 43>
The sealing member 43 is an elastic member arranged at both ends in the longitudinal direction X of the lamp cover 30 while being sandwiched between the end covers 40 and both ends in the longitudinal direction X of the lamp cover 30 . be. A sealing member 43 that is an elastic member is attached to the end portion 36 of the lamp cover 30 to close the opening of the end portion 36 . The sealing member 43 is made of a resin material and is an elastically deformable seal member (gasket, packing, etc.). Therefore, the sealing member 43 seals both ends in the longitudinal direction X of the lamp cover 30 while being sandwiched between the end covers 40 and both ends in the longitudinal direction X of the lamp cover 30 . The sealing member 43 is made of a resin material so as to be elastically deformable, and is in close contact with the lamp cover 30 and the end cover 40 .

The closure 43 has a closure main portion 430 , an inner peripheral portion 435 , an outer peripheral portion 437 and a connecting portion 436 . The sealing member 43 has a sealing member main portion 430, an inner peripheral portion 435, an outer peripheral portion 437, and a connecting portion 436 integrally formed. The closure main portion 430 is formed so as to block the inside of the inner peripheral portion 435 . The closure main portion 430 is sandwiched between the fixing portion 56 of the fixture 54 and the second cover main portion 420 of the second end cover 42, which will be described later. The closure main portion 430 is formed in a plate-like shape, and in a state where the closure 43 and the end cover 40 are engaged, the wire insertion portion 431 and the sealing member 431 are formed on the side facing the end cover 40 . A stopper tubular portion 433 is formed. The closure main portion 430 contacts the second cover main portion 420 of the second end cover 42 when the closure 43 and the end cover 40 are engaged. The wire insertion portion 431 protrudes from the side facing the end cover 40 when the sealing member 43 and the end cover 40 are engaged, and passes through the power line 81, the ground line 82, and the control line 83. A wire insertion hole 432 is formed to allow the wire to pass through. Two sealing member tubular portions 433 are provided with the wire insertion portion 431 interposed therebetween. One may be sufficient, and three or more may be sufficient. The sealing member tubular portion 433 protrudes from the side facing the end cover 40 when the sealing member 43 and the end cover 40 are engaged with each other. The boss portion 57 protruding from the fixing portion 56 of the fixing member 54 is inserted into the sealing member cylindrical portion 433 when the sealing member 43 and the fixing member 54 are engaged with each other. The sealing member tubular portion 433 is formed in a cylindrical shape. A screw insertion hole 434 for screwing the fixing screw 75 is formed at the tip of the sealing member cylindrical portion 433 .

An inner peripheral portion 435 is formed at the peripheral edge portion of the closure main portion 430 formed in a plate shape. The inner peripheral portion 435 of the end cover 425 of the second end cover 42 and the lamp in a state where the sealing member 43 as an elastic member is engaged with the second end cover 42 and the lamp cover 30 . It is a portion sandwiched between the end portion 36 of the cover 30 and the inner peripheral portion 38 .

An outer peripheral portion 437 of the sealing member 43 is formed in an annular shape and arranged outside the inner peripheral portion 38 so as to face the inner peripheral portion 38 . This outer peripheral portion 437 is formed between the outer wall portion 410 a of the first end cover 41 and the outer peripheral portion 37 of the lamp cover 30 when the sealing member 43 is engaged with the first end cover 41 and the lamp cover 30 . It is the part sandwiched between

The connection portion 436 of the closure 43 is located between the inner peripheral portion 38 and the outer peripheral portion 437 of the closure main portion 430 . The connection portion 436 connects the first cover main portion 410 of the first end cover 41 and the cover end of the lamp cover 30 in a state where the sealing member 43 is engaged with the first end cover 41 and the lamp cover 30 . It is a portion sandwiched between the portion 35 and the portion 35 .

The connecting members 44 are connecting devices, are provided at both ends of the lamp 3 in the longitudinal direction X, and are mounting brackets for attaching the lamp 3 to the lighting device 2 . The connecting member 44 is attached to the fixture using two fixing screws 75 in a state in which the central side (X2 side) surface of the fixing portion 46 in the longitudinal direction X (first direction) and the end surface of the boss portion 57 are in contact with each other. 54 and fixed. The connecting member 44 is not directly fixed to the end cover 40 using screws or the like. The connecting member 44 is positioned and indirectly fixed via the sealing member 43 that is in close contact with the boss portion 57 of the fixture 54 . That is, the connecting member 44 is arranged outside the end cover 40 in the first direction, which is the longitudinal direction X of the lamp 3 , and is fixed to the mounting member 50 partially penetrating the end cover 40 . , and the other part is fixed to the lighting device 2 . In Embodiment 1, the connecting member 44 is formed by bending a metal plate. However, the connecting member 44 is not limited to being formed by bending a metal plate material, and may be formed using other materials such as resin, ceramic, etc., or may be formed by extrusion, molding, or the like. It may be formed by other methods such as additive manufacturing. The connecting member 44 has a connecting portion 45 , a fixing portion 46 and an engaging portion 47 .

The connecting portion 45 is a plate-shaped member that extends from the lower end (Z2 side) of the fixing portion 46 toward the end portion side (X1 side) of the lamp 3 . That is, the connecting portion 45 is a plate-shaped member that protrudes from the lower edge portion of the fixing portion 46 . The connecting portion 45 protrudes to the opposite side of the end cover 40 when engaged with the end cover 40 . In other words, the connecting portion 45 protrudes in the direction opposite to the protruding direction of the engaging portion 47 . When the lamp 3 is attached to the lighting fixture 2 , the upper surface of the connecting part 45 other than the stepped part 450 contacts the connecting part 27 of the lighting fixture 2 .

A stepped portion 450 having different surface heights is formed in the connecting portion 45 , and a connecting screw insertion portion 451 into which the connecting screw 48 is inserted is formed in the stepped portion 450 . The stepped portion 450 is a portion that is partially recessed downward (Z2 side) in the central region of the connecting portion 45 in the lateral direction Y. As shown in FIG. A retaining washer 480 for fixing the connection screw 48 that has passed through the connection screw insertion portion 451 is arranged on the stepped portion 450 of the connection portion 45 . The retaining washer 480 is fitted to the connecting screw 48 in advance so as not to come off from the connecting screw 48 . The height (depth, step) dimension of the stepped portion 450 is the same as the thickness dimension of the retaining washer 480 . When the lamp 3 is attached to the lighting fixture 2, the upper (Z1 side) surface of the retaining washer 480 abuts the connecting portion 27 of the lighting fixture 2, and the lower (Z2 side) surface of the retaining washer 480 contacts the stepped portion 450 of the connecting member 44 . The shape and area of stepped portion 450 are determined in consideration of the shape and dimensions of retaining washer 480 . The connection screw insertion portion 451 is formed in a slit shape from the end portion side (X1 side) in the longitudinal direction X (first direction) at substantially the center of the stepped portion 450 in the lateral direction Y. As shown in FIG. The connection screw insertion portion 451 is formed with a width dimension larger than the shaft portion 481 of the connection screw 48, and the shaft portion 481 of the connection screw 48 is inserted therethrough. The shape of the connection screw insertion portion 451 is not limited to a slit shape, and may be a through hole having a circular or polygonal cross section including an elliptical shape.

The fixing portion 46 is a portion of the connecting portion 45 that stands upward from an end portion on the central side (X2 side) in the longitudinal direction X (first direction). The fixed portion 46 is a plate-like member. The fixing portion 46 clamps the end cover 40 and the sealing member 43 together with the fixing member 54 of the mounting member 50 . A fixing screw insertion hole 460 for screwing the fixing screw 75 is formed in the fixing portion 46 . The fixing screw insertion hole 460 is a through hole through which the fixing screw 75 to be screwed into the screw hole 58 of the boss portion 57 is inserted. The fixing portion 46 is attached to the boss portion 57 by fixing screws 75 inserted into the fixing screw insertion holes 460 .

The connecting member 44 is formed with a slit-like wire insertion hole 470 through which wires such as the power supply wire 81, the ground wire 82, and the control wire 83 are passed. The wire insertion hole 470 has an upper slit 4710 and an end slit 4711 . The wire insertion hole 470 formed in the fixed portion 46 is called an end slit 4711 . The end slit 4711 is formed in the vertical direction (Z-axis direction) of the connecting member 44 . The end slit 4711 is connected to an upper slit 4710 formed in the engaging portion 47 and described later.

An engagement piece insertion hole 461 may be formed in the fixed portion 46 . The engaging piece insertion hole 461 is a through hole provided in the fixing portion 46 corresponding to the cross-sectional shape of the second cover engaging piece 422 and the second cover engaging claw 423 of the second end cover 42 . The engaging piece insertion hole 461 receives the second cover engaging piece 422 and the second cover engaging claw 423 of the second end cover 42 that move in the longitudinal direction X (first direction) as the lamp cover 30 extends. , are formed so as not to interfere with the fixing portion 46 of the connecting member 44 . The engaging piece insertion hole 461 is formed when the amount of extension of the lamp cover 30, that is, the amount of movement of the second cover engaging piece 422 and the second cover engaging claw 423 is small, or when the end cover 40 is integrated. If it is formed, it is unnecessary and not an essential configuration of the lamp 3 .

The engaging portion 47 is a portion of the fixed portion 46 that extends from the upper (Z1 side) end toward the center (X2 side) in the longitudinal direction X (first direction). That is, the engaging portion 47 is a plate-shaped member that protrudes from the upper edge portion of the fixing portion 46 . The engaging portion 47 protrudes toward the end cover 40 when engaged with the end cover 40 , and is arranged on the upper side (Z1 side) of the lamp 3 in the lamp 3 .

As described above, the connecting member 44 is formed with a slit-like wire insertion hole 470 through which wires such as the power supply wire 81, the ground wire 82, and the control wire 83 are passed. A wire insertion hole 470 formed in the engaging portion 47 is referred to as an upper slit 4710 . The upper slit 4710 is formed along the longitudinal direction X of the lamp 3 . The upper slit 4710 is connected to an end slit 4711 formed in the fixed portion 46 . The upper slit 4710 is formed in the engaging portion 47 of the connecting member 44 so that the end portion 36 of the lamp cover 30 and the end portion cover 40 are free ends where movement in the longitudinal direction X (first direction) is not restricted. It is a slit that is made. A cover wire holding portion 416 inserted through an insertion hole 472 (to be described later) engages with the upper slit 4710 while its movement in the lateral direction Y and the vertical direction Z is restricted. The cover wire holding portion 416 arranged in the insertion hole 472 is not restricted in movement in the longitudinal direction X (first direction). When the cover wire holding portion 416 is engaged with the upper slit 4710 , the position of the connecting member 44 with respect to the end cover 40 is determined. Alignment of the screw 75 becomes easier. When all or part of the power supply line 81, the ground line 82, and the control line 83 are bundled with a braided tube or the like, they are generally stiff and difficult to bend. However, since the connecting member 44 has end slits 4711 formed so as to be connected to the upper slits 4710, wiring can be facilitated even if the power supply lines 81 and the like are bundled and difficult to bend.

The engaging portion 47 is formed with an insertion hole 472 into which a cover wire holding portion 416, which will be described later, is inserted. The insertion hole 472 is formed continuously with the upper slit 4710 . The insertion hole 472 is a through hole formed in the fixed portion 46 and is formed to be connected to the central side (X2 side) of the upper slit 4710 in the longitudinal direction X (first direction). The insertion hole 472 is formed with a shape and dimensions that allow the cover wire holding portion 416 to be inserted therein. The cover wire holding portion 416 inserted through the insertion hole 472 moves along the longitudinal direction X while being engaged with the upper slit 4710 as the lamp cover 30 extends. Therefore, the cover wire holding portion 416 does not hinder the extension and contraction of the lamp cover 30 and the movement of the end cover 40 and the sealing member 43 accompanying the extension and contraction of the lamp cover 30 .

<Mounting member 50>
The mounting member 50 is a member for fixing the light source unit 60, the control unit 80, and the like in the space inside the lamp cover 30, as shown in FIGS. Also, the mounting member 50 is a member that fixes the mounting member 50 to the end covers 40 and connecting members 44 that are attached to both ends of the lamp cover 30 . The mounting member 50 has a pedestal 51 and a fixture 54 . The mounting member 50 is housed in the lamp cover 30 . The mounting member 50 is then fixed to the end cover 40 and the connecting member 44 by fixing screws 75, as shown in FIG. Therefore, the mounting member 50 is not directly fixed to the lamp cover 30, but the end covers 40 are fitted (fitted) to the cover ends 35 on both sides in the longitudinal direction X of the lamp cover 30. It is connected to the lamp cover 30 via the.

The pedestal 51 is a main part of the mounting member 50, and the light source section 60, the control section 80, and the like are mounted thereon. In Embodiment 1, the pedestal 51 is formed by bending a metal plate. However, the pedestal 51 is not limited to one formed by bending a metal plate material. It may be formed by other methods such as lamination molding. Although not shown, the pedestal 51 is surface-treated or a functional member is laid on the pedestal 51 in order to improve heat radiation efficiency (thermal emissivity) or light utilization efficiency (reflectance). You may The pedestal 51 has a mounting surface portion 52 and side portions 53 . The mounting surface portion 52 of the pedestal 51 is formed in a long flat plate shape, and the light source portion 60 is mounted on the surface which is the irradiation side surface. In addition, a control section 80 such as a power supply device is attached to the back surface, which is the instrument side surface.

As shown in FIG. 6 , screw holes 520 are formed in the mounting surface portion 52 of the base 51 . The screw holes 520 are formed at both ends in the longitudinal direction X of the mounting surface portion 52 . A fixing screw 75 for fixing the mounting member 50 to the end cover 40 and the connecting member 44 is inserted into the screw hole 520 . The mounting surface portion 52 is formed with a notch portion 521 through which the power supply line 84 and the like are passed. The notch portions 521 are formed at the edges of the mounting surface portion 52 at both end portions in the longitudinal direction X of the mounting surface portion 52 . Here, a mounting hole (not shown), which is a through hole, is formed in the mounting surface portion 52 at the other end of the lamp 3 instead of the notch portion 521 .

Side portions 53 of the pedestal 51 are standing portions that are bent from both ends of the mounting surface portion 52 in the short direction Y toward the irradiation side. The side portion 53 is erected from the edge portion of the mounting surface portion 52 along the longitudinal direction X of the mounting surface portion 52 , thereby improving the rigidity of the base 51 . In Embodiment 1, the side portion 53 is erected only on the instrument side where the control portion 80 and the like are arranged. However, the side portion 53 may be erected only on the irradiation side where the light source portion 60 is arranged, or may be erected on both the irradiation side and the instrument side. In Embodiment 1, the side portions 53 are erected at both ends of the mounting surface portion 52 in the transverse direction Y. It may be set up at the position of

The fixtures 54 are arranged at both ends of the base 51 in the longitudinal direction X, and are members for fixing the mounting members 50 to the end covers 40 and connecting members 44 mounted to both ends of the lamp cover 30 . The fixture 54 passes through the end cover 40 and the connecting member 44 is fixed. Here, in Embodiment 1, the fixture 54 is configured as a separate member from the pedestal 51, but the configuration of the fixture 54 is not limited to this configuration. For example, the pedestal 51 and the fixture 54 may be integrally formed by bending both end portions of the pedestal 51 so that the pedestal 51 has a portion having the same function as the fixture 54 . The fixture 54 may be attached to the pedestal 51 using a fixing member such as a mounting screw (not shown).

The fixture 54 has a mounting portion 55 and a fixing portion 56, and is manufactured by bending a sheet metal. Although the fixture 54 is a metal fitting, it is not limited to a metal fitting. For example, it may be formed using other materials such as resin and ceramic. It may be formed by a method.

Attachment portions 55 of the fixture 54 are portions for attaching the fixture 54 to the base 51 , and are fixed to both end portions of the base 51 using fixing screws 75 . The mounting portion 55 may be structurally integrated with the pedestal 51 by, for example, caulking, welding, or fitting (engaging).

The fixing portion 56 of the fixture 54 sandwiches the end cover 40 and the sealing member 43 together with the fixing portion 46 of the connecting member 44 . That is, in a state in which the lamp cover 30, the sealing member 43, the end cover 40, and the connecting member 44 are combined, there is no sealing between the fixing portion 56 and the fixing portion 46 of the connecting member 44. A tool 43 is arranged. A boss portion 57 is provided on the fixing portion 56 .

The boss portion 57 is attached to the fixed portion 56 by, for example, caulking, welding, or fitting (engaging). A screw hole 58 into which a fixing screw 75 is screwed is formed in the boss portion 57 . A screw groove is formed on the inner peripheral side of the screw hole 58 . Then, from the outside of the connecting member 44, the fixing screw insertion hole 460 of the connecting member 44, the end cover insertion portion 421 of the second end cover 42, the first cover through hole 411 of the first end cover 41, and the sealing member The fixing screw 75 is inserted through the screw insertion hole 434 of 43 . A fixing screw 75 is screwed into the screw hole 58 of the boss portion 57 to fix the connecting member 44 to the fixture 54 of the mounting member 50 . That is, the connecting member 44 is fixed to the boss portion 57 of the fixture 54 .

<Light source unit 60>
A light source unit 60 serving as a light source includes a light emitting element 61, a substrate 62, and the like, as shown in FIG. The light emitting element 61 emits light by power supply. In Embodiment 1, light emitting diodes (hereinafter referred to as LEDs) are used as the light emitting elements 61, and are arranged along the longitudinal direction X on the mounting surface of the substrate 62 in rows, zigzags, or the like. is implemented in In the light emitting element 61 of Embodiment 1, a phosphor that converts the wavelength of blue light into yellow light is placed on an LED chip that emits blue light with a wavelength of 440 [nm] to 480 [nm]. It is a quasi-white LED element that is a surface-mounted component that is integrated. Here, the light emitted from the light emitting element 61 has the maximum luminous flux value and spreads by the irradiation angle α symmetrically with respect to the optical axis perpendicular to the light emitting surface. In Embodiment 1, it is assumed that the irradiation angle α of the light emitting element 61 is 120 degrees. A solid state laser, a semiconductor laser, an organic EL (Electro Luminescence), an inorganic EL, or the like may be used as the light emitting element 61 . The substrate 62 may be a glass-epoxy substrate (FR-4), a glass-composite substrate (CEM-3), a paper epoxy substrate (FR-3), a paper phenol substrate (XPC), a metal base substrate, or the like.

The control unit 80 performs light emission control of the light source unit 60 and the like and functions as a power supply device, converts electric power supplied from the outside into electric power for lighting the light emitting element 61 , and supplies the light emitting element 61 with the electric power. In Embodiment 1, as described above, the control unit 80 is attached to the back surface of the mounting surface portion 52 of the pedestal 51 using a fixing member such as a screw (not shown). It is housed in a tubular lamp cover 30 . However, the controller 80 may be attached to the lighting device 2 instead of the lamp device 3 . In this case, the electric wire serves as a power supply line that functions as a supply path for power supplied from the control unit 80 to the light emitting element 61 . One ends of electric wires such as power supply line 81 , ground line 82 and control line 83 in the first embodiment are connected to control unit 80 . The other end is connected to a terminal block (not shown) attached to the lighting fixture 2 .

As described above, in the lamp cover 30 according to the first embodiment, the second resin layer 30B is laminated on the outer wall surface side of the first resin layer 30A when viewed from the light source section 60 . The Young's modulus E of the material of the second resin layer 30B is smaller than the Young's modulus E of the material of the first resin layer 30A. Therefore, by reducing the difference in the amount of expansion and contraction between the first resin layer 30A and the second resin layer 30B, the lamp cover 30 reduces the shear stress caused by the difference in the amount of expansion and contraction. Destruction can be prevented. Further, by setting the thickness of the first resin layer 30A to 0.8 [mm] or more, it is possible to obtain hardness effective for protecting the device. On the other hand, by setting the thickness of the second resin layer 30B to more than 0 [mm] and 0.8 [mm] or less, it is possible to ensure weather resistance while maintaining translucency.

Furthermore, in the lamp cover 30 of Embodiment 1, by laminating the second resin layer 30B on a part of the first resin layer 30A, it is possible to eliminate waste such as the resin material and the work process.

The lamp cover 30 of Embodiment 1 can be manufactured by the same method by forming the first resin layer 30A and the second resin layer 30B by extrusion molding or injection molding. Further, in the lamp cover 30 of the first embodiment, the first resin layer 30A is formed by extrusion molding or injection molding, and the second resin layer 30B is formed by applying a coating or a film. Manufacture of the cover 30 can be performed easily.

Embodiment 2.
FIG. 7 is a diagram showing a vertical cross section of the lamp cover 30 orthogonal to the longitudinal direction of the lighting device 1 according to Embodiment 2. As shown in FIG. The second embodiment differs from the first embodiment in the configuration of the lamp cover 30 . In the second embodiment, the same reference numerals are given to the same parts as in the first embodiment.

The lamp cover 30a of Embodiment 2 has a translucency that transmits at least visible light, and the first resin layer 30A, which is the base material, includes a plurality of resin layers different from the first resin layer 30A. It is a laminated structure. In the lamp cover 30a, the first resin layer 30A is arranged at a position close to the light source unit 60 housed in the internal space. In addition, the second resin layer 30B is arranged at a position far from the light source section 60 with the first resin layer 30A in between, and further from the light source section 60 with the first resin layer 30A and the second resin layer 30B in between. The third resin layer 30C is laminated on. Here, the second resin layer 30B is laminated on the outer wall surface side of the first resin layer 30A. Also, the third resin layer 30C is laminated on the outer wall surface side of the second resin layer 30B. Therefore, in the lamp cover 30a of the second embodiment, the third resin layer 30C is the outermost layer in the lamp cover 30a. Therefore, the third resin layer 30C is directly exposed to the special environment. The lighting device 1 is assumed to be installed in a special environment such as a factory, in a semi-outdoor environment such as under the eaves, or in a completely outdoor environment. Therefore, the third resin layer 30C, which is the outermost layer, has weather resistance including low hygroscopicity, water resistance, light resistance, and the like. Here, light resistance is a property including sunlight resistance.

The first resin layer 30A needs hardness to cover and protect the mounting member 50, the light source section 60, the control section 80, etc. accommodated in the internal space. Therefore, it is desirable that the thickness T1 of the first resin layer 30A is 0.8 [mm] or more even at the thinnest part.

The second resin layer 30B has a Young's modulus E [10 ⁴ kg/cm ² ] is preferably formed so as to be equal to or less than the first resin layer 30A. The second resin layer 30B needs to maintain the above performance while maintaining translucency. Therefore, it is desirable that the thickness dimension T2 of the second resin layer 30B is more than 0 [mm] and equal to or less than 0.8 [mm].

As described above, the third resin layer 30C needs to be made of a material having relatively better weather resistance than the first resin layer 30A and the second resin layer 30B. Then, the third resin layer 30C has a Young's modulus E [10 ⁴ kg so that it can follow the expansion and contraction of the second resin layer 30B arranged at a position closer to the light source unit 60, which is a heat source, than the third resin layer 30C. /cm ² ] is preferably equal to or less than the second resin layer 30B. Further, the third resin layer 30C needs to maintain the above-described performance while maintaining translucency. Therefore, it is desirable that the thickness dimension T3 of the third resin layer 30C is 0 [mm] and more than 0.8 [mm] or less.

As described above, in the second embodiment, the second resin layer 30B is laminated on the outer wall surface side of the first resin layer 30A when viewed from the light source section 60 in the lamp cover 30a. Also, the third resin layer 30C is laminated on the outer wall surface side of the second resin layer 30B when viewed from the light source section 60 . The Young's modulus E of the material of the second resin layer 30B is smaller than the Young's modulus E of the material of the first resin layer 30A. Also, the Young's modulus E of the material of the third resin layer 30C is smaller than the Young's modulus E of the material of the second resin layer 30B. For this reason, the difference in the amount of expansion and contraction between the first resin layer 30A, the second resin layer 30B, and the third resin layer 30C is reduced to reduce the shear stress caused by the difference in expansion and contraction, thereby preventing shear fracture. can be prevented. Further, by setting the thickness of the first resin layer 30A to 0.8 [mm] or more, it is possible to obtain hardness effective for protecting the device. On the other hand, by setting the thickness dimension of the second resin layer 30B and the third resin layer 30C to more than 0 [mm] and not more than 0.8 [mm], weather resistance is ensured while maintaining translucency. be able to.

Although the lighting device 1 described above has been described by exemplifying a so-called trough-type lighting fixture 2, the lighting device 1 is not limited to this. In the lighting device 1, as the lighting fixture 2 to which the lamp 3 is attached, other shapes such as a so-called shaded type, a one-side reflection shaded type, or a V-shaped type can be adopted.

Moreover, although the lighting fixture 2 and the lighting fixture 3 which comprise the lighting device 1 mentioned above were all illustrated as an elongated thing, they are not limited to this. The lighting device 3 or the lighting device 2 to which the lighting device 3 is attached may be short. For example, the lamp 3 may have a shape in which the length dimension in the cylinder axis direction of the lamp cover 30 is smaller than the length dimension in the radial direction.

Further, although the lighting device 1 described above has been described as having the lighting device 2 and the lamp 3, the lighting device 1 is not limited to this. Instead of the lighting device 2, the lighting device 1 may be obtained by attaching the raceway to the lighting device 3 using the raceway as the attachment portion.

1 lighting device, 2 lighting equipment, 3 lamp, 9 construction part, 20 equipment main body, 21 equipment bottom surface part, 22 equipment side surface part, 23 equipment end part, 24 knockout, 25 mounting part, 26 opening end part, 27 connecting part, 28 screw hole 29 wiring area 30, 30a lamp cover 30A first resin layer 30B second resin layer 30C third resin layer 31 parallel portion 32 first connection portion 33 second connection portion 34 rib 35 cover end 36 end 37 outer periphery 38 inner periphery 40 end cover 41 first end cover 42 second end cover 43 closure 44 connecting member 45 connection Part 46 Fixing Part 47 Engagement Part 48 Connection Screw 49 Cover Lid 50 Mounting Member 51 Pedestal 52 Mounting Surface Part 53 Side Part 54 Fixture 55 Mounting Part 56 Fixing Part 57 Boss Part 58 screw hole 60 light source unit 61 light emitting element 62 substrate 75 fixing screw 80 control unit 81 power supply line 82 grounding line 83 control line 84 feeder line 85 wiring material 300 first part 301 second 2 parts 370 first outer peripheral portion 371 second outer peripheral portion 410 first cover main portion 410a outer wall portion 411 first cover through hole 412 first cover connecting hole 413 connecting guide 414 cover lower surface portion 415 Cover lower surface through hole 416 Cover wire holding portion 417 Cover end surface 418 Cover end surface through hole 419 End cover outer peripheral portion 420 Second cover main portion 421 End cover insertion portion 421a Insertion wall 422 Second Cover engaging piece 423 Second cover engaging claw 425 End cover inner peripheral portion 430 Seal main portion 431 Wire insertion portion 432 Wire insertion hole 433 Seal cylindrical portion 434 Screw insertion hole , 435 inner peripheral portion, 436 connection portion, 437 outer peripheral portion, 450 stepped portion, 451 connection screw insertion portion, 460 fixing screw insertion hole, 461 engagement piece insertion hole, 470 electric wire insertion hole, 472 insertion hole, 480 retaining washer , 481 shank, 520 screw hole, 521 notch, 4710 upper slit, 4711 end slit.

Claims (11)

A lamp cover for covering a light source part having a light source,
a translucent first resin layer;
A second resin layer having translucency laminated on the outer wall surface side outside the first resin layer when viewed from the light source,
The lamp cover, wherein the second resin layer is made of a material having a Young's modulus smaller than that of the first resin layer. 2. The lamp cover according to claim 1, wherein the second resin layer is made of resin having higher weather resistance than the first resin layer. The first resin layer is made of polycarbonate resin or acrylic resin,
3. The lamp cover according to claim 1, wherein the second resin layer is made of a cycloolefin polymer resin. The thinnest part of the first resin layer has a thickness of 0.8 mm or more, and the second resin layer has a thickness of more than 0 and 0.8 mm or less. 1. The lamp cover according to item 1. The lamp cover according to any one of claims 1 to 4, wherein the first resin layer and the second resin layer are formed by extrusion molding or injection molding. The lamp according to any one of claims 1 to 4, wherein the first resin layer is formed by extrusion molding or injection molding, and the second resin layer is formed by applying a coating or a film. cover for. A third resin layer having translucency laminated on the outer wall surface side outside the second resin layer when viewed from the light source,
2. The lamp cover according to claim 1, wherein the third resin layer is made of a material having a Young's modulus smaller than that of the second resin layer. The first resin layer is made of a polycarbonate-based resin,
The second resin layer is made of an acrylic resin,
8. The lamp cover according to claim 7, wherein the third resin layer is made of a cycloolefin polymer resin. 9. The lamp cover according to claim 7, wherein the third resin layer has a thickness of more than 0 and not more than 0.8 mm. a lamp cover according to any one of claims 1 to 9;
and a light source section having a light source. a lamp according to claim 10;
and a lighting fixture having a mounting portion to which the lamp is mounted.

Images