Light source

Abstract

To provide a road lamp which can optimize a radiation range regardless of a shape of a road.SOLUTION: A road lamp includes: a light source part including a light-emitting element substrate mounted with light emitting elements; and a body part including a case which is installed covering the light source part and has an opening at a lower part, and a radiation cover which covers the opening of the case, is installed facing the light-emitting element substrate, and transmits radiation light from the light emitting elements. The light source part is installed in the body part through multiple protruding parts which are provided at multiple positions in a light emitting element peripheral edge, protrude in a light radiation direction exceeding heights of the light emitting elements, and enables adjustment of protruding heights independently. The load lamp is adopted to achieve the above object.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Since the illumination range of a road light varies depending on the installation angle with respect to the road surface (horizontal plane), the angle is adjusted so that the illumination range is optimal according to the width and number of lanes of the road on which the light is installed.

[0003] In recent years, street lights have begun to use light emitting elements such as light emitting diodes (LEDs), which consume less power and have a longer life, as their light sources, instead of high pressure mercury lamps and metal halide lamps.

[0004] In street lights that use LEDs as light sources, known means for adjusting the installation angle include a curved section formed on an arm for attaching the street light to a pole such as a utility pole installed on the road surface (Patent Document 1), and a flange section (Patent Document 2) which is a plate-like body formed on an adapter that covers the upper end of a pole with a cylindrical section and installs the fixture body, and which is arranged radially from the outer periphery of the cylindrical section, slightly inclined with respect to a plane perpendicular to the central axis of the cylindrical section, and against which the fixture body abuts.

[0005] Furthermore, as an LED lighting fixture for illuminating streets and the like, with a variable irradiation direction of the light source unit, Patent Document 3 describes an LED lighting fixture in which a mounting plate to which a light source unit is attached is supported via a hinge so as to be swingable on a fixed plate, and this fixed plate is fixed integrally to a heat sink plate, with the mounting plate and the heat sink plate being connected via a flexible heat conductive member. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2011-34856 A [Patent Document 2] JP 2017-45527 A [Patent Document 3] JP 2010-9765 A Summary of the Invention [Problem to be solved by the invention]

[0007] As described in Patent Document 1, when adjusting the installation angle of a street light by changing the curved part of the arm, it is necessary to prepare multiple arms with different degrees of curvature, which is not economical. Also, when trying to obtain the optimal illumination range by trial and error when installing a street light, it is necessary to repeatedly replace the arm and measure the amount of light, which is time-consuming to install.

[0008] When the adapter described in Patent Document 2 is used, two different installation angles can be achieved by rotating the adapter 180°, but the degree of freedom in the installation angle is still low.

[0009] In addition, road lights are sometimes installed not only on flat straight roads, but also on slopes and curves. In this case, in order to achieve the optimal illumination range, it may be necessary to adjust the angle in multiple directions, such as the width direction (transverse direction) and length direction (extension direction) of the road.

[0010] In the LED lighting device described in Patent Document 3, the light irradiation angle can be changed only in one direction around the hinge as the rotation axis, so there is a risk that the optimal irradiation range cannot be obtained on slopes or curves.

[0011] The present invention has been made to solve the above problems, and an object of the present invention is to provide a street light that can optimize the illumination range regardless of the shape of the road. [Means for solving the problem]

[0012] One aspect of the present invention is a road light comprising: a light source unit including a light-emitting element substrate on which a light-emitting element is mounted; a main body including a case installed to cover the light source unit and having an opening at a lower portion; and an irradiation cover covering the opening of the case and installed opposite the light-emitting element substrate, through which light emitted from the light-emitting element passes, wherein the light source unit is installed within the main body via a plurality of protrusions provided at a plurality of locations on the periphery of the light-emitting element, protruding in the light irradiation direction beyond the height of the light-emitting element, and each of the protruding heights being independently adjustable. Effect of the Invention

[0013] According to the present invention, a road light capable of optimizing the illumination range regardless of the shape of the road is provided. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram showing a main part of a street light according to one embodiment of the present invention; [Diagram 2] FIG. 1 is a schematic diagram showing the appearance of a street light according to one embodiment of the present invention; [Diagram 3] FIG. 1 is a schematic diagram showing an installation mode of a light source unit in a street light according to one embodiment of the present invention; [Figure 4] FIG. 1 is a schematic diagram showing a preferred structure of a street light according to one embodiment of the present invention; [Diagram 5] FIG. 1 is a schematic diagram showing a manner in which the relative position and angle of a light source unit are adjusted according to a preferred structure of a street light according to one embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The configuration and effects of the present invention will be described together with the technical concept. However, the mechanism of action includes assumptions, and the correctness of such assumptions does not limit the present invention. In addition, among the components in the following embodiments, components that are not described in the independent claims that show the highest concept will be described as optional components.

[0016] [Basic structure of road lights] As shown diagrammatically in FIG. 1, the street light of this embodiment comprises a light source unit 2 having a light-emitting element 21 and a light-emitting element substrate 22 on which the light-emitting element 21 is mounted, a heat dissipation mechanism 3 installed on the back surface of the light-emitting element substrate 22, i.e., the surface opposite to the surface on which the light-emitting element 21 is mounted, and a plurality of protrusions 5 provided at a plurality of locations on the periphery of the light-emitting element 21, protruding beyond the height of the light-emitting element 21 in the light emission direction of the light-emitting element 21, and each of the protruding heights being independently adjustable.

[0017] As the light emitting element 21 constituting the light source section 2, a light emitting diode (LED) is suitable. The output and color of light emitted from the light emitting element are not particularly limited, and may be appropriately selected depending on the installation location and purpose of the street light.

[0018] As the light emitting element substrate 22 on which the light emitting element 21 is mounted, a printed wiring board or the like that has been conventionally used for road lights that use light emitting elements as a light source can be used.

[0019] In the light source unit 2, a heat dissipation mechanism 3 is attached to the surface of the light-emitting element substrate 22 opposite to the surface on which the light-emitting elements 21 are arranged. The heat dissipation mechanism 3 acts to dissipate heat generated in association with the light emission of the light-emitting elements 21 to the outside. The shape of the heat dissipation mechanism 3 is not particularly limited, but is preferably a fin shape in order to increase the contact area with the outside air and obtain high heat dissipation. The material of the heat dissipation mechanism 3 is not limited as long as it has excellent strength, thermal conductivity, and chemical stability, but is preferably a metal, particularly copper, aluminum or an alloy thereof, or stainless steel, and more preferably aluminum or an alloy thereof in terms of its light weight.

[0020] The protrusions 5 are provided at a plurality of locations on the periphery of the light emitting element 21. Examples of the periphery of the light emitting element 21 include a location on the light emitting element substrate 22 where the light emitting element 21 is not mounted, and a surface of a member (for example, the heat dissipation mechanism 3) to which the light emitting element substrate 22 is attached, to which the light emitting element substrate 22 is attached. The protrusions 5 are preferably provided at a plurality of locations on the periphery of the light emitting element 21 that are not on the same straight line, that is, at least three locations. By providing the protrusions 5 in this manner, as described below, in addition to the angle of the light emitting element substrate 22 to the irradiation cover 12, the distance of the light emitting element substrate 22 to the irradiation cover 12 can also be independently adjusted. The protrusions 5 may be provided at two locations. In this case, the angle of the light emitting element substrate 22 to the irradiation cover 12 can be adjusted in a plurality of directions by adjusting the protruding height of the protrusions 5. The protrusion 5 protrudes in the light emission direction of the light emitting element 21 beyond the height of the light emitting element 21. Therefore, when the light source unit 2 is installed in the main body unit 1 via the protrusion 5 as described below, it is possible to prevent the light emitting element 21 from coming into contact with the irradiation cover 12. Furthermore, each protrusion 5 is configured so that its protrusion height can be adjusted while it is installed on the periphery of the light-emitting element 21. The means for adjusting the protrusion height is not particularly limited as long as it can maintain the protrusion height determined by adjustment while the street light is in service, and examples include means having a movable part such as a screw, a leaf spring, and a movable support, and means for configuring one protrusion 5 by stacking a plurality of members and changing the number of layers of the members. The material of the protrusion 5 is not particularly limited as long as it can support the weight of the light source unit 2 and does not shift in position inside the main body while the street light is in use, and examples of the material include rubber such as polypropylene rubber and silicone rubber, as well as resin and metal. Note that as a means for preventing the projection 5 from shifting in position relative to the irradiation cover 12, it is also possible to use double-sided tape, adhesive, or the like for fixing the projection 5.

[0021] The street light according to this embodiment has a light source unit 2 attached to a main body unit 1 (see FIG. 2). The main body unit 1 is provided with a case 11 that is installed to cover the light source unit 2 and has an opening at the bottom, and an illumination cover 12 that covers the opening of the case 11, is installed facing the light emitting element substrate 22, and transmits light emitted from the light emitting element 21.

[0022] Case 11 is made of a material that is excellent in weather resistance and waterproofing. Examples of materials that can be used include light metal die-casting such as aluminum or its alloy, and ASA (Acrylonitrile Styrene Acrylate) resin. The shape and structure of case 11 are not particularly limited, and case 11 may be provided with an intake port for taking in outside air and an exhaust port for discharging internal heat together with gas, or a reflector for reflecting light emitted from the light-emitting element.

[0023] A material that is translucent to transmit light irradiated from the light emitting element and has excellent weather resistance is used for the irradiation cover 12. In addition, as described below, when the light source unit 2 is installed on the main body unit 1 by placing the protruding portion 5 on the irradiation cover 12, it is preferable to use a material with high mechanical strength for the irradiation cover 12. Examples of usable materials include glass, polycarbonate resin, and acrylic resin.

[0024] The light source unit 2 is electrically connected to the main body unit 1 by the light source connection unit 4. As long as the light source connection unit 4 can adjust the angle and / or distance of the light emitting element substrate 22 with respect to the irradiation cover 12, as described below, in a state in which the main body unit 1 and the light source unit 2 are electrically connected, the shape, structure, material, and the like of the light source connection unit 4 are not limited, and a cable, a flexible printed circuit board, a base, and the like can be used. In this embodiment, since the light source unit 2 can be positioned within the main body unit 1 by the light source connection unit 4 and the multiple protrusions 5, the protrusions 5 can be provided in two locations as described above.

[0025] The light source unit 2 is installed in the main body unit via a protrusion 5, as shown in Fig. 3. The protrusion 5 may be disposed on the irradiation cover 12 as shown in the figure, or may be disposed on the periphery of the opening at the bottom of the case. As described above, the protrusion 5 is configured to protrude beyond the height of the light-emitting element 21 in the light emission direction of the light-emitting element 21, thereby preventing the light-emitting element 21 from coming into contact with the irradiation cover 12. In addition, when the light source unit 2 is installed, the angle of the light emitting element substrate 22 with respect to the irradiation cover 12 can be adjusted in multiple directions by adjusting the protruding height of each protrusion 5. This means that the surface including the light emitting element substrate 12 and the surface including the irradiation cover 22 can form multiple intersection lines that are not parallel to each other. In this embodiment, the protrusions 5 provided at two locations can form an intersection line extending in the length direction (extension direction) of the road by adjusting the angle in the width direction (transverse direction) of the road as shown in FIG. 3(a), and an intersection line extending in the width direction (transverse direction) of the road by adjusting the angle in the length direction (extension direction) of the road as shown in FIG. 3(b). In each figure, all of the intersection lines extend in a direction perpendicular to the paper surface. Since the angle of the light emitting element substrate 22 with respect to the irradiation cover 12 can be adjusted in multiple directions, an optimal irradiation range can be obtained regardless of the shape of the road.

[0026] Furthermore, with regard to street lights that use LEDs as their light source, Patent Document 1 states that "it is desirable to maintain the distance between the light-emitting diodes 40 of the light-emitting unit 29 and the light-projecting section 20 of the cylindrical cover 12 such that the light emitted from the light-projecting section 20 does not cause glare and that the light-emitting diodes 40, which are the light source, do not cause bumps" (paragraph

[0040] ), and so it is sometimes required to maintain the distance between the light-emitting section and the cover within a range where the emitted light does not cause glare and where the light emitted from each element cannot be distinguished.

[0027] In this embodiment, when the protrusions 5 are provided at multiple locations that are not on the same line, the angle and distance of the light-emitting element substrate 22 to the irradiation cover 12 can be adjusted independently. Therefore, while maintaining the angle of the light-emitting element substrate 22 to the irradiation cover 12 at a value that provides an optimal irradiation range, the distance of the light-emitting element substrate 22 to the irradiation cover 12 can be adjusted to obtain emitted light that is free of glare and unevenness.

[0028] [Preferred structure of roadway lights] In this embodiment, the light source connection part 4 may be configured as shown in FIG. 4. In this case, the light source connection part 4 includes a base 41 that electrically connects the main body part 1 and the light source part 2, and a cylindrical base receiver 42 that is configured so that the base 41 is attached to one end and extends from the one end toward the light source part. A mounting member 43 for mounting the light source part 2 is fixed to the base receiver 42 at a location where the base 41 is not attached. On the other hand, a spacer 44 is provided on the light source part 2, and the light source part 2 is mounted on the mounting member 43 with a gap between the base receiver 42 and the mounting member 43. At this time, the spacer 44 is fixed so that its relative position and angle with respect to the mounting member 43 can be adjusted by a long hole 45 provided in the mounting member 43 or the mounting member 43 and extending in the light emission direction of the light emitting element 21, and a connecting pin 46 inserted through the long hole 45.

[0029] The base 41 is connected to a socket of the main body 1, thereby electrically connecting the light source unit 2 or the light emitting element substrate 22 constituting the light source unit 2 to the main body 1. There are no particular limitations on the type, and a screw-in type base generally called an E-type base, a plug-in type base, or the like can be used.

[0030] The base receiver 42 is made of an electrical insulator having a cylindrical shape, and the base 41 is attached to one end. The base receiver 42 is made of a material that is electrically insulating and strong enough to support the weight of the light source unit 2. Examples of usable materials include resin materials such as polycarbonate resin, and ceramic materials such as sintered alumina. A circuit board that controls the light emission of the light source unit 2 may be accommodated inside the hollow base receiver 42.

[0031] The mounting member 43 is a member that is fixed to a portion of the base receiver 42 where the base 41 is not attached, and to which the light source unit 2 is attached via a spacer 44 described later. The mounting member 43 is made of a material having a strength sufficient to support the weight of the light source unit 2. Examples of usable materials include aluminum or its alloy, stainless steel, etc.

[0032] The spacer 44 is a member installed on the light source unit 2, and connects the light source unit 2 to the mounting member 43 with a gap between the light source unit 2 and the base receiver 42. By providing a gap between the light source unit 2 and the base receiver 42, in combination with a connection structure between the mounting member 43 and the spacer 44 described below, it is possible to easily adjust the angle that the light source unit 2 (light-emitting element substrate 22) makes with respect to the axis of the base receiver 42. The spacer 44 is made of a material having a strength sufficient to support the weight of the light source unit 2. Examples of usable materials include aluminum or its alloy, stainless steel, etc.

[0033] The spacer 44 has an elongated hole 45 extending in the light emission direction of the light emitting element 21, and is fixed to the mounting member 43 by a connecting pin 46 inserted through the elongated hole 45 so that the relative position and angle of the spacer 44 can be adjusted. The direction in which the elongated hole 45 extends may be any direction along the travel direction of the light emitted from the light emitting element 21, and is not limited to a direction perpendicular to the light emitting element substrate 22. By providing the elongated hole 45 as described above, it becomes possible to move the entire light source unit 2 on which the spacer 44 is installed in a direction perpendicular to the light emitting element substrate 22. In this embodiment, the elongated hole 45 is provided in the spacer 44, but the elongated hole 45 may be provided in the mounting member 43.

[0034] The connecting pin 46 inserted through the long hole 45 is configured to be changeable between a fixed state in which the relative position and angle of the spacer 44 to the mounting member 43 is fixed, and an open state in which the relative position and angle can be changed. In the open state, the spacer 44 moves relative to the mounting member 43 in the direction in which the long hole 45 extends, and rotates relative to the mounting member 43 about the connecting pin 46 as an axis, thereby changing the relative position and angle with respect to the mounting member 43. The structure of the connecting pin 46 that can be changed between the fixed state and the open state is not particularly limited, but a structure having screws such as bolts and nuts is preferable because it is easily available and inexpensive. The connecting pin 46 may be a separate member from the mounting member 43 and the spacer 44, or may be formed integrally with either the mounting member 43 or the spacer 44.

[0035] Among the light source connection part 4, the base 41, the base receiver 42 and the mounting member 43 are fixed in position and angle relative to the main body part 1. On the other hand, even after the spacer 44 is attached to the main body part 1, when the connecting pin 46 is in an open state, the spacer 44 can move in the direction in which the long hole 45 extends and rotate around the connecting pin 46 as an axis. That is, the spacer 44 and the light source part 2 in which it is installed can change their position and angle relative to the main body part 1. The movement of the light source part 2 in the direction in which the long hole 45 extends allows the distance between the light emitting element substrate 22 and the irradiation cover 12 to be changed as shown in FIG. 5(a). Furthermore, the rotation of the light source part 2 around the connecting pin 46 as an axis allows the angle between the light emitting element substrate 22 and the irradiation cover 12 to be changed as shown in FIG. 5(b). Therefore, by adding the above-mentioned movement and rotation to the adjustment of the protruding height of the protrusion 5 described above, the position and angle of the light source unit can be adjusted more precisely, and it is possible to obtain emitted light that is free of glare and unevenness while optimizing the irradiation range. [Industrial Applicability]

[0036] According to the present invention, a street light is provided that can optimize the illumination range regardless of the shape of the road. Also, according to a preferred embodiment of the present invention, a street light is provided that can optimize the illumination range while obtaining emitted light that is free of glare and unevenness. Therefore, the street light according to the present invention is useful in that it can be installed anywhere and is highly versatile. [Explanation of symbols]

[0037] 1 Main unit 11 Cases 12 Irradiation cover 2 Light source section 21 Light emitting element 22 Light emitting element substrate 3 Heat dissipation mechanism 4 Light source connection 41 Cap 42 Cap receiver 43 Mounting material 44 Spacer 45 long hole 46 Connecting pin 5 Protrusion

Claims

[Claim 1] a light emitting element substrate on which a light emitting element is mounted; a member to which the light-emitting element substrate is attached; a base that is disposed on one end side of the member to which the light emitting element substrate is attached and is electrically connected to a main body when the member to which the light emitting element substrate is attached is viewed from the light emitting element substrate side; a cylindrical base receiver configured to have one end to which the base is attached and to extend from the one end to a member to which the light-emitting element substrate is attached; an attachment member fixed to a portion of the base receiver where the base is not attached; a spacer that connects the member on which the light-emitting element substrate is attached and the mounting member with a gap between the member on which the light-emitting element substrate is attached and the base receiver, and has surfaces that face each other across an axis along which the base receiver extends, the spacer having a pair of elongated holes that extend in the light irradiation direction of the light-emitting element; A plurality of protrusions are provided in a position facing the base when the member to which the light emitting element substrate is attached is viewed from the light emitting element substrate side, protruding in a light irradiation direction beyond the height of the light emitting element, and each protruding height is independently adjustable. Equipped with The light emitting element substrate is disposed in a main body including an irradiation cover having a translucency that transmits light irradiated from the light emitting element through the plurality of protrusions, the light emitting element substrate being opposed to the irradiation cover; The position and angle of the spacer relative to the main body can be changed by a connecting member inserted into the long hole of the spacer. Light source section.

Images