AU2014367903B2

AU2014367903B2 - Light-emitting element module and illumination device

Info

Publication number: AU2014367903B2
Application number: AU2014367903A
Authority: AU
Inventors: Kaori HIRAIWA; Yukiko Mishima
Original assignee: Iwasaki Denki KK
Current assignee: Iwasaki Denki KK
Priority date: 2013-12-18
Filing date: 2014-12-10
Publication date: 2017-01-05
Anticipated expiration: 2034-12-10
Also published as: JP5776757B2; WO2015093359A1; JP2015118812A; AU2014367903A1

Abstract

　Provided are a light-emitting element module in which glare can be reduced, and an illumination device. A light-emitting element module (10) is configured so that a plurality of light-emitting elements (11) are disposed along edges (13A) of a substrate (13) and light-emitting elements (11) are disposed on the inside of said light-emitting elements (11). The light outputted by the light-emitting elements (11) on the inside is smaller than the light outputted by the light-emitting elements (11) disposed on the outside along the edges (13A) of the substrate (13). An illumination device is provided with the light-emitting element module (10).

Description

1 2014367903 05 Dec 2016

LIGHT-EMITTING ELEMENT MODULE AND ILLUMINATION DEVICE

Technical Field [0001]

The present invention relates to a light-emitting element module including a plurality of light-emitting elements and an illumination device.

Background Art [0002]

As one of illumination devices that are installed outdoors to illuminate road surfaces, a crime prevention light that illuminates a street has been conventionally known. Further, in recent years, a crime prevention light which adopts an LED as a light source has been proposed and put to practical use (refer to Japanese Patent Laid-Open No. 2012-79599, for example). A light-emitting element module of the crime prevention light is configured by arranging a plurality of light-emitting elements on a substrate.

[0003]

However, since in the aforementioned configuration, a plurality of light-emitting elements are arranged on the substrate, lights concentrate, and glare that dazzles human eyes is likely to occur, depending on light outputs 8390579_1 (GHMatters) P103292.AU 2 2014367903 05 Dec 2016 of the light-emitting elements.

Summary of the Invention [0004]

According to a first broad aspect of the present invention, there is provided a light-emitting element module of the present invention is such that a plurality of light-emitting elements are disposed along an edge of a substrate, and a light-emitting element is disposed at an inner side of the plurality of light-emitting elements, and light output of the light-emitting element at the inner side is made smaller than light outputs of the light-emitting elements at an outer side which are disposed along the edge of the substrate, the light-emitting element module comprising a lens cover that has a lens for each of the light-emitting elements, and covers the substrate, wherein an exposure opening on which the light-emitting element at the inner side is exposed is formed in the lens cover.

[0005]

In the aforementioned configuration, the exposure opening may be formed at a side near the edge of the substrate .

8390579J (GHMatters) P103292.AU 3 2014367903 05 Dec 2016 [0006]

In the aforementioned configuration, the light-emitting element at the inner side may be a light emitting element with higher light-emitting efficiency than the light emitting elements at the outer side.

[0007]

In the aforementioned configuration, the light-emitting elements may be disposed in multiple rows, and in a zigzag state.

[0008]

According to a further broad aspect of the present invention, there is provided an illumination device that includes the aforementioned light-emitting element module.

Advantageous Effect of Invention [0009]

The applicant has obtained the knowledge that as brilliance of a light emitting section is made more uniform, glare can be reduced more, and that if a central portion of the light emitting section is made darker than an edge portion of the light emitting section, luminance distribution on a visual part of the light emitting section becomes uniform, and glare can be reduced.

[0010]

Besides, the applicant has obtained the knowledge 8390579_1 (GHMatters) P103292.AU 4 2014367903 05 Dec 2016 that in comparison of devices that are the same devices and can obtain the same luminous fluxes, as an area (hereinafter, referred to as an area on a visual part) of a light emitting section, recognized by a human being, is larger, a light emitting surface luminance is lower, and glare can be reduced more, and that by making the central portion of the light emitting section darker than the edge portion of the light emitting section, an area where luminance distribution on the visible part of the light emitting section is felt uniform increases, and glare is felt low.

[0011]

Since according to the present invention, the light outputs of the light-emitting elements at the inner side are made smaller than the light outputs of the light-emitting elements at the outer side which are disposed along the edge of the substrate, the substantially central portion of the light-emitting element module becomes darker than the edge portion, so that the luminance distribution on the visual part of the light-emitting element module becomes uniform, and glare can be reduced. Further, since the substantially central portion of the light emitting section becomes darker than the edge portion, the area where the luminance distribution on the visual part of the light emitting 8390579_1 (GHMatters) P103292.AU 5 2014367903 05 Dec 2016 section is felt uniform, in the glare zone, increases, and glare is felt low.

Brief Description of Drawings [0012]

In order that the invention may be more clearly ascertained, embodiments will now be described, by way of example, with reference to the accompanying drawing, in which:

Figure 1 is a perspective view of a crime prevention light (an illumination device) according to an embodiment of the present invention.

Figure 2 is a perspective view showing the crime prevention light from a rear side.

Figure 3 shows views showing the crime prevention light, (A) is a plan view, (B) is a side view, (C) is a bottom view, (D) is a front view and (E) is a rear view.

Figure 4 is a sectional view taken along line A-A in Figure 3.

Figure 5 is a sectional view taken along line B-B in Figure 3.

Figure 6 is an exploded perspective view of the crime prevention light in which a light source unit is exploded.

Figure 7 is an exploded perspective view of the 8390579.1 (GHMatters) P103292.AU 6 2014367903 05 Dec 2016 crime prevention light in which a power supply unit is exploded.

Figure 8 shows views showing a device body, (A) is a plan view, (B) is a side view, (C) is a bottom view, (D) is a front view, and (E) is a rear view.

Figure 9 is a perspective view showing the light source unit.

Figure 10 is an exploded perspective view showing an LED module.

Figure 11 shows views showing a lens cover with LEDs, (A) is a plan view, (B) is a front view, (C) is a side view and (D) is a bottom view.

Figure 12 shows sectional views showing the lens cover in Figure 11, (A) is a sectional view taken along line C-C, (B) is a sectional view taken along line D-D, and (C) is a sectional view taken along line E-E.

Figure 13 is a sectional view taken along line F-F in Figure 12.

Figure 14 is an explanatory view of light distribution of the crime prevention light.

Figure 15 is a perspective view showing a crime prevention light including a globe according to a modification example of the present invention.

Figure 16 is a sectional view taken along line F-F in Figure 15.

8390579_1 (GHMatters) P103292.AU 7 2014367903 05 Dec 2016

Figure 17 is an exploded perspective view of a crime prevention light including a device body according to a modification example of the present invention.

Figure 18 is a view showing Figure 17 from below a front face.

Figure 19 is a perspective view showing an LED substrate of the present invention.

Figure 20 is a plan view of Figure 19.

Description of Embodiment [0013]

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following explanation, a crime prevention light will be described as an example of an illumination device.

Figure 1 is a perspective view showing a crime prevention light 1 according to the present embodiment. Figure 2 is a perspective view showing the crime prevention light 1 from a rear side. Figure 3 shows views showing the crime prevention light 1, Figure 3 (A) is a plan view, Figure 3 (B) is a side view, Figure 3 (C)

8390579_1 (GHMatters) P103292.AU is a bottom view, Figure 3 (D) is a front view, and

Figure 3 (E) is a rear view. Figure 4 is a sectional view taken along line A-A in Figure 3. Figure 5 is a sectional view taken along line B-B in Figure 3. Figure 6 is an exploded perspective view of the crime prevention light 1 in which a light source unit 6 is exploded.

[0014]

Prior to explanation of a configuration of the crime prevention light 1, knowledge about glare that is obtained by the applicant will be described.

Through various experiments, the applicant has obtained the knowledge that as brilliance of a light emitting section recognized by a human being is made more uniform, glare can be reduced more. Further, the applicant has obtained the knowledge that if a central portion of the light emitting section is made darker than an edge portion of the light emitting section, luminance distribution on a visual part of the light emitting section becomes uniform, and glare can be reduced. Further, the applicant has obtained the knowledge that if lights of light-emitting elements are seen to be independent, glare can be reduced.

[0015]

In addition to the above, the applicant has obtained the knowledge that when a height of a lighting tool is T, a distance from the lighting tool is L, and a reference of an angle is a directly downward direction, a glare 7808154_1 (GHMatters) P103292.AU 9 zone φ where a human being feels dazzled is arctan(L/(T-l.5)) = 60 to 80°. Here, (T-1.5) corresponds to the height of the lighting tool seen from a height (approximately 1.5m) of an eye level of a pedestrian.

The applicant has obtained the knowledge that glare can be reduced by setting an illuminance before eyes at 81 x or less, and an equivalent veiling luminance at 0.2 cd/m2 or less in the glare zone φ. Further, the applicant has obtained the knowledge that glare can be reduced by setting a maximum luminance of the lighting tool at 170,000 cd/m2 or less, and an average luminance of the lighting tool at 53,000 cd/m2 or less.

[0016]

Besides, the applicant has obtained the knowledge that in comparison of devices that are the same devices and can obtain the same luminous fluxes, as an area (hereinafter, referred to as an area on a visual part) of a light emitting section, recognized by a human being, is larger, a light emitting surface luminance is lower, and glare can be reduced more. Further, the applicant has obtained the knowledge that by making a central portion of the light emitting section darker than an edge portion of the light emitting section, an area where luminance distribution on the visible part of the light emitting section is felt uniform increases, and glare is felt low.

The crime prevention light 1 is configured to reduce glare on the basis of the knowledge as above.

7808154_1 (GHMatters) P103292.AU 10 [0017]

Next, the configuration of the crime prevention light 1 will be described.

The crime prevention light 1 illuminates a street with a predetermined brightness for the purpose of preventing crimes, and includes a device body 2 that is installed to extend to a road surface, as shown in Figure 1 to Figure 3. The device body 2 of the present embodiment is formed into a thin plate shape substantially rectangular in bottom view, which extends from a tip end 2A at a road surface side to a rear end 2B. At the rear end 2B, a fixing metal fitting 3 for fixing the device body 2 to a fastening tool Q that is fixed to, for example, a utility pole P or the like is provided.

[0018]

As shown in Figure 4 to Figure 6, the device body 2 has an entire surface of a bottom face opened as an irradiation opening 8, and includes a resin globe 4 that covers the irradiation opening 8, on a bottom face of the device body 2. A mounting face 5 is integrally formed on the irradiation opening 8, and an LED module (a light-emitting element module) 10 is assembled onto the mounting face 5 to configure a light source unit 6. The light source unit 6 is configured to have distribution of light that illuminates a place directly under (including a front side) the device body 2 in the street, and a wide area extending in traffic directions of the street that 7808154_1 (GHMatters) P103292.AU 11 correspond to both sides directions of the device body 2. More specifically, the light source unit 6 has, in the respective two directions of the traffic directions, the above described LED modules 10 that illuminate the directions. The LED module 10 includes a plurality (22 in the illustrated example) of LEDs (light-emitting elements) 11.

[0019]

Further, the device body 2 includes a power supply housing section 20 which houses a power supply unit (power supply) 7 for lighting the LED module 10, and the power supply housing section 20 and the mounting face 5 are integrally formed.

The device body 2 has corrosion resistance with which the device body 2 can sufficiently withstand outdoor use, and is formed by using a material with high heat conductivity (for example, an aluminum or an aluminum alloy). By using the material with high heat conductivity, generated heat of the LED module 10 is radiated from the device body 2, and a light source temperature of the LED module 10 is kept at a temperature suitable for a light emitting operation.

[0020]

As shown in Figure 6, an enclosing wall 31 in a rectangular frame shape in plan view that encloses the mounting face 5 is provided in the device body 2, and an interior of a light source chamber 32 inside the 7808154_1 (GHMatters) P103292.AU 12 enclosing wall 31 is made watertight, whereby the light source chamber 32 is made watertight. That is, throughout an entire perimeter of the enclosing wall 31, a tip end 31A of the enclosing wall 31 is in close contact with a packing 9 of the globe 4, whereby an interior of the enclosing wall 31 is sealed with watertightness .

The globe 4 is formed from a material (for example, a resin) having optical transparency and diffusibility, so that a light of the LED 11 is diffused by the globe 4, and glare is reduced. The globe 4 is formed to bulge in a directly downward direction so as to cover the mounting face 5 from a lower side, and a lower portion of the globe 4 is a flat portion 4A formed to be flat. The lower portion of the globe 4 is made the flat portion 4A, whereby bulging of the globe 4 to a lower side is reduced, and a height of the crime prevention light 1 can be reduced.

[0021]

In the globe 4, a through-hole 4B that penetrates through the globe 4 in the vertical direction is formed, and the through-hole 4B is provided with a filter 36 (Figure 17). The filter 36 is configured by including a water vapor non-transmitting filter that does not transmit water and water vapor in addition to dust, and by the filter 36, dust and water vapor in air passing through the through-hole 4B are removed. By forming the 7606154.1 (GHMatters) P103292.AU 13 through-hole 4B in the globe 4, and providing the filter 36 in the through-hole 4B, air in the light source chamber 32 passes via the through-hole 4B, even though the device body 2 has a watertight structure. That is, since the air in the light source chamber 32 is heated and expands by heating of the LED module 10 when the LED module 10 is lit, the air in the light source chamber 32 is discharged to outside from the through-hole 4B. Meanwhile, when the LED module 10 is turned off, the air expanded by being heated by heating of the LED module 10 is cooled by an external atmosphere temperature and the like and contracts, so that external air enters the light source chamber 32 from the through-hole 4B.

[0022]

Figure 7 is an exploded perspective view of the crime prevention light 1 in which the power supply unit 7 is exploded.

As shown in Figure 7, the power supply housing section 20 is formed into a box shape (a square tube shape in the present embodiment) that extends to the rear end 2B from the tip end 2A of the device body 2, and has the rear end 2B opened as a housing section opening 21.

A top face 20A of the power supply housing section 20 is provided to incline so that a height becomes smaller toward the tip end 2A from the rear end 2B. In the present embodiment, the device body 2 is molded by casting (in more detail, aluminum die casting), and by 7808154.1 (GHMatters) P103292.AU 14 inclining the top face 20A of the power supply housing section 20, a die is easily removed when the device body 2 is molded, so that the device body 2 can be easily formed.

[0023]

The power supply unit 7 is configured by mounting a power supply substrate 7B on which an electronic member 7A is mounted, on a power supply mounting plate 7C. Further, an illuminance sensor 7D is mounted on the power supply mounting plate 7C. Insulation sheets such as a power supply insulation sheet 7E, and a sensor insulation sheet 7F are respectively provided for electric components such as the electronic member 7A and the illuminance sensor 7D. The power supply unit 7 is housed in the power supply housing section 20 from the housing section opening 21.

[0024]

On the top face 20A of the power supply housing section 20, a sensor exposing hole 22 on which the illuminance sensor 7D is exposed is formed in a position corresponding to the illuminance sensor 7D, and a sensor cover 23 is mounted on the sensor exposing hole 22.

Note that in the present embodiment, by providing the illuminance sensor 7D at the top face 70A of the power supply housing section 20, the light from the light source unit 6 is prevented from influencing detection of the illuminance sensor 7D, but the position of the 7808154_1 (GHMatters) P103292.AU 15 illuminance sensor 7D is not limited to this. The illuminance sensor 7D may be provided on a side face or the like of the device body 2, for example, as long as it is the position where the light from the light source unit 6 does not influence detection of the illuminance sensor 7D.

[0025] A body portion lid 25 is fixed to the housing section opening 21 via a packing 24, and the aforementioned fixing metal fitting 3 is fixed to the body portion lid 25. A wiring leading-in hole 26 is opened in the body portion lid 25, and through the wiring leading-in hole 26, electric wiring (not illustrated) at a primary side is led into the power supply housing section 20 from outside. At this time, in order to seal the wiring leading-in hole 26, a bushing 27 is fitted in the wiring leading-in hole 26, and the electric wiring at the primary side is passed through the bushing 27 to be wired. The power supply housing section 20 is configured to be of a watertight structure by the sensor cover 23, the packing 24 and the bushing 27.

[0026]

Next, the mounting face 5 will be described in detail.

Figure 8 shows views showing the device body 2 from which the globe 4 and the LED modules 10 are removed, Figure 8 (A) is a plan view, Figure 8 (B) is a side view, 7808154_1 (GHMatters) P103292.AU 16

Figure 8 (C) is a bottom view, Figure 8 (D) is a front view, and Figure 8 (E) is a rear view.

As shown in Figure 5 shown above, the mounting face 5 is formed integrally with the power supply housing section 20 so as to enclose an outer periphery of the power supply housing section 20, in more detail, a bottom face 20B and both side faces 20C and 20D. Since the device body 2 is configured by integrally forming the power supply housing section 20 and the mounting face 5 from a heat conductive material, heat of the LED module 10 can be radiated from the entire device body 2 including the power supply housing section 20, and therefore, heat radiation performance of the crime prevention light 1 can be enhanced. Further, since the power supply housing section 20 and the mounting face 5 are integrally formed and the power supply housing section 20 is used as a casing, a mounting metal fitting for mounting the LED module 10 is not required, and therefore, the crime prevention light 1 can be made compact. In addition, the crime prevention light 1 has a configuration in which the mounting face 5 integrally formed at the power supply housing section 20 is only covered with the globe 4, and therefore, can be made simple in structure.

[0027]

The mounting face 5 is disposed obliquely with respect to a horizontal plane H. Thereby, an area on a 7808154_1 (GHMatters) P103292.AU 17 visible part of the LED module 10 in the glare zone φ becomes larger, as compared with a case where the mounting face 5 is disposed horizontally, and glare can be reduced as described above.

In the present embodiment, a mounting angle Θ of the mounting face 5 from the horizontal plane H is set at 20° or more, and 40° or less. Since the LED module 10 can be disposed to be directed to a distant place by setting the mounting angle Θ at 20° or more, the distant place can be irradiated. Further, an upward luminous flux traveling upward which is not required of the crime prevention light 1 can be reduced by setting the mounting angle Θ at 40° or less.

[0028]

Further, in the present embodiment, two of the mounting faces 5 are disposed back to back, whereby respective distant places in both directions of the traffic directions of the road surface can be irradiated, so that a relatively wide range can be irradiated.

The two mounting faces are provided obliquely to the horizontal plane H to be disposed in a valley shape, and in the present embodiment, the two mounting faces 5 are connected at a lower end 5B to be disposed in a substantially V-shape in front view. In a valley portion 33 between the two mounting faces 5, the power supply housing section 20 is disposed so that the bottom face 20B of the power supply housing section 20 is lower than 7808154_1 (GHMatters) P103292.AU 18 an upper end 5A of the mounting face 5. In this way, the two mounting faces 5 are disposed in the valley shape, and the power supply housing section 20 is disposed in the valley portion 33, whereby the height of the device body 2 can be reduced as compared with the case where the power supply housing section 20 is disposed above the mounting face 5. Further, a length in a longitudinal direction of the device body 2 can be reduced as compared with the case where the power supply housing section 20 is disposed behind the mounting face 5.

[0029]

As shown in Figure 6, in a tip end 20E of the power supply housing section 20, a wiring leading-out hole 28 from which electric wiring is led out is formed, and through the wiring leading-out hole 28, electric wiring (not illustrated) at a secondary side which extends from the power supply unit 7 is led out to the light source chamber 32, outside the power supply housing section 20. The LED module 10 is disposed so that the connector 12 for connecting the electric wiring at the secondary side is located at the tip end 20E side of the power supply housing section 20, and the electric wiring which is passed through the wiring leading-out hole 28 is connected to the connector 12. Since the wiring leading-out hole 28 is formed in the tip end 20E of the power supply housing section 20, and the electric wiring at the secondary side is connected in the tip end 20E in this 7808154_1 (GHMatters) P103292.AU 19 way, the electric wiring at the secondary side can be wired with a minimum necessary length. By making the electric wiring short, the electric wiring can be connected to the primary and secondary sides without passing through a vicinity of the power supply unit 7, and therefore noise can be reduced. Further, since routing of the electric wiring at the secondary side can be simplified by making the electric wiring short, the power supply unit 7 can be made compact.

Note that although in the present embodiment, the tip end 20E of the power supply housing section 20 is on the same plane as a tip end 5C of the mounting face 5, the tip end 20E of the power supply housing section 20 does not have to correspond to the tip end 5C of the mounting face 5, in the longitudinal direction.

[0030]

As shown in Figure 8, the upper end 5A of the mounting face 5 and the power supply housing section 20 form a connected shape in which a top face 2C of the device body 2, that is located above the mounting face 5, is in a planar shape. As shown in Figure 1 and Figure 2, the crime prevention light 1 is mounted in a posture with the tip end 2A facing upward so that the top face 2C inclines downward to a rear. Thereby, rainwater and snow fallen on the top face 2C are moved to a rear side to be smoothly dropped. Further, since the top face 2C is 7808154.1 (GHMatters) P103292.AU 20 formed into the planar shape, dirt such as fallen leaves can be prevented from accumulating on the top face 2C.

[0031]

The upper ends 5A of the mounting faces 5 are connected on a plane, whereby a wall thickness of an outer edge portion 34 surrounded by upper end 5A portions of the mounting faces 5 and the top face 2C becomes large as shown in Figure 8. In molding by casting, a defect (a shrink mark) that is a recess formed on a surface of a thick-walled portion of a molded product is likely to occur if the wall thickness is large.

Thus, in the present embodiment, a plurality of grooves 35 are formed in the outer edge portion 34 of the mounting face 5. These grooves 35 are provided throughout a predetermined width from the upper end 5A of the mounting face 5, and are disposed among a plurality of LEDs 11. By the grooves 35, the wall thickness of the outer edge portion 34 can be reduced, and therefore, a shrink mark can be prevented from being generated on the device body 2. Further, by forming the grooves 35, an area of the device body 2, that is in contact with air becomes large, and therefore the heat radiation performance of the device body 2 can be enhanced.

[0032]

Although in the present embodiment, a rear end 5D of the mounting face 5 protrudes downward more than the lower end 5B of the mounting face 5, the present 7808154_1 (GHMatters) P103292.AU 21 invention is not limited to this, and a lower portion of the rear end 5D may be caused to correspond to the lower end 5B, for example. A rear portion of the globe 4 is supported by the lower portion of the rear end 5D.

Further, although the rear end 5D is located at a tip end side from the rear end 2B of the power supply housing section 20, the rear end 5D may correspond to the rear end 2B.

On the two mounting faces 5 which are configured as above, LED modules 10 are respectively disposed.

[0033]

Next, the LED module 10 will be described in detail.

Figure 9 is a perspective view showing the light source unit 6, and Figure 10 is an exploded perspective view showing the LED module 10. Figure 11 shows views showing a lens cover 40 with the LEDs 11, Figure 11 (A) is a plan view, Figure 11 (B) is a front view, Figure 11 (C) is a side view, and Figure 11 (D) is a bottom view. Figure 12 shows sectional views showing the lens cover 40 in Figure 11, Figure 12 (A) is a sectional view taken along line C-C, Figure 12 (B) is a sectional view taken along line D-D, and Figure 12 (C) is a sectional view taken along line E-E. Figure 13 is a sectional view taken along line F-F in Figure 12. In Figure 9, the two LED modules 10 are disposed on the same plane for explanation .

[0034] 7808154_1 (GHMatters) P103292.AU 22

As shown in Figure 9 and Figure 10, the LED module 10 is configured to be in a bar shape by disposing a plurality of LEDs 11 in an LED substrate (board) 13 in a rectangular plate shape, and providing the lens cover 40 having a lens 41 for each of the LEDs 11 to cover the LED substrate 13. The LED module 10 is configured so that the same amount of current passes to each of the plurality of LEDs 11, and includes a connector 12 that connects the electric wiring from the power supply unit 7, at one end in a longitudinal direction of the LED substrate 13. The LED module 10 has a screw hole 14 formed in a substantially center of the LED substrate 13, and is assembled to the mounting face 5 by being screwed in the substantially center of the LED substrate 13. A screw 15 at the time of screwing penetrates through and fastens the LED substrate 13 and the lens cover 40, and is fixed to the mounting face 5, as shown in Figure 5.

[0035]

The LED 11 is an LED that irradiates white light, and as shown in Figure 10, is mounted, with an optical axis K facing substantially perpendicularly to a substrate face of the LED substrate 13. The LED 11 can be regarded as substantially a point light source that irradiates light from a light emitting section including a light emission point G (a point having a maximum luminance) (Figure 13), and the plurality of LEDs 11 are disposed with spaces left from one another so that the 7808154_1 (GHMatters) P103292.AU 23 light emission points G are seen to be independent. The space is set in accordance with a light output of the LED 11. Here, "the light emission points G are seen to be independent" may mean that the space between the light emission points G of the adjacent LEDs 11 does not become completely dark, but the space may have a certain degree of brightness. Further, whether or not the light emission points G are seen to be independent is evaluated at a height of an eye level of a pedestrian (approximately 1.5 m) and in an effective field of view (20° vertically, 30° laterally) at a time of facing a walking direction. In this way, the LEDs 11 are disposed in such a manner that lights of the plurality of LEDs 11 are seen to be independent, whereby glare can be reduced as described above.

[0036]

The LEDs 11 are configured by a plurality of outside LEDs (outside light-emitting elements) 11A that are disposed along an edge 13A of the LED substrate 13, and inside LEDs (inside light-emitting elements) 11B that are disposed at an inner side of the outside LEDs 11A.

In the present embodiment, the LEDs 11 are disposed in multiple rows (three rows in the illustrated example) in a lateral direction, and are disposed in a zigzag state by shifting positions in an arrangement direction. In more detail, the outside LEDs 11A in both outside rows are disposed so that longitudinal positions are the same, 7808154_1 (GHMatters) P103292.AU and the inside LEDs 11B in an inside row are disposed in such a manner as not to be aligned with the outside LEDs 11A in both the outside rows, in the lateral direction. Since the LEDs 11 are disposed in the multiple rows, and in the zigzag state in this way, interference of the lights of the LEDs 11 can be prevented, and illuminance unevenness can be prevented. Further, when the lens cover 40 is injection-molded from a material such as a resin, for example, the lenses 41 are disposed in a zigzag state, whereby the material easily flows to portions of the lenses 41, and the lens cover 40 can be easily formed.

[0037]

Light outputs of the plurality of inside LEDs 11B are made smaller than light outputs of the plurality of outside LEDs 11A. More specifically, a number (6) of the inside LEDs 11B in the inside row is made smaller than a number (eight) of the outside LEDs 11A in each of both the outside rows. Since a substantially central portion of the LED module 10 becomes darker than the edge portions thereby, luminance distribution on a visible part of the LED module 10 becomes uniform, and glare can be reduced. Further, since the substantially central portion of the LED module 10 becomes darker than the edge portions, an area where the luminance distribution on the visible part of the LED module 10 is felt uniform, in the glare zone φ, increases, and glare is felt low. Further, 7808154_1 (GHMatters) P103292.AU 25 by making the number of inside LEDs 11B small, the LEDs 11 are easily disposed in a zigzag state.

[0038]

Further, for at least one of the inside LEDs 11B, a high efficiency LED (a high efficiency light-emitting element) 11C having higher light emission efficiency than the outside LED 11A is used. By using the high efficiency LED 11C like this, the number of inside LEDs 11B can be decreased while sufficient light outputs are kept.

Here, an LED which is not highly efficient will be referred to as a low efficiency LED 11D. In the present embodiment, in the inside row, the low efficiency LED (low efficiency light-emitting element) 11D is disposed between the high efficiency LEDs 11C.

[0039]

As shown in Figure 11, the lens cover 40 has a flat board portion 42 of a transparent resin, and the lenses 41 are integrally molded from a resin on a surface 42A of the flat board portion 42. The flat board portion 42 forms a substantially rectangular shape, the screw hole 43 is formed in a substantially center of the flat board portion 42, and the screw 15 (Figure 5) is passed through the screw hole 43 to fix the lens cover 40 to the mounting face 5.

[0040] 7808154_1 (GHMatters) P103292.AU 26

In the crime prevention light 1, the LED substrate 13 and the lens cover 40 are fastened together with screws as described above, and positional deviations of the respective lenses 41 and the LEDs 11 on the LED substrate 13 are prevented. In addition to this, on a back face 42B of the flat board portion 42 of the lens cover 40, positioning bosses 44 are vertically provided within a plane thereof, as shown in Figure 11 (C), and as shown in Figure 10, positioning holes 16 that receive the positioning bosses 44 are formed within a plane of the LED substrate 13. By engagement of these positioning bosses 44 and the positioning holes 16, the LED substrate 13 and the lens cover 40 are positioned at a more accurate position. In particular, the lens cover 40 includes the lens 41 for each of the LEDs 11, and therefore, accurate positioning of these lenses 41 is performed at one time. Among the positioning holes 16 in the LED substrate, one hole in a substantially center has the same dimension as the screw hole 14 of the LED substrate 13, and is placed in a symmetrical position.

[0041]

As shown in Figure 12, the respective lenses 41 are disposed in positions that are overlaid on the corresponding LEDs 11. A lens 41A corresponding to the high efficiency LED 11C forms a same shape, and has a same light distribution characteristic to control irradiation light of the high efficiency LED 11C.

7808154_1 (GHMatters) Pi 03292.AU 27

Further, a lens 41B corresponding to the low efficiency LED 11D forms a same shape, and has a same light distribution characteristic to control irradiation light of the low efficiency LED 11D.

More specifically, as shown in Figure 13, the lens 41 has an incidence plane 45 that curves into a convex shape to a lens inner face (that is, a concave shape in bottom view), and has an emission plane 46 in a convex shape on a lens outer face with respect to the incidence plane 45. By the incidence plane 45, a concave portion is formed in a back face of the lens 41, and the LED 11 enters the concave portion.

[0042]

The LED 11 irradiates a substantially entire periphery with a light radially, with the optical axis K as a center, and the lens 41 is configured to distribute (one side light distribution) the irradiation light in one direction (a transverse direction in the present embodiment). More specifically, the LED 11 is disposed by being brought to one side in a lateral direction with respect to the emission plane 46 which is formed in a substantially spherical shape, and the lens 41 irradiates light which travels to a distant place at the other side in the lateral direction. Since the lenses 41 are configured to distribute the lights of the LEDs 11 to the distant places in this way, the distant places in the 7808154_1 (GHMatters) P103292.AU 28 traffic directions of the road surface can be irradiated, and therefore, a relatively wide range can be irradiated.

The lens 41B corresponding to the low efficiency LED 11D is configured to irradiate a distant place with light than the lens 41A corresponding to the high efficiency LED 11C.

[0043]

As shown in Figure 10, in the lens cover 40, exposure openings 47 on which some of the plurality of inside LEDs 11B are exposed are formed. Thereby, the substantially central portion of the LED module 10 can be made sufficiently bright even when the light outputs of the plurality of inside LEDs 11B are made smaller than the light outputs of the plurality of outside LEDs 11A.

The exposure openings 47 are disposed at sides near the edges 13A of the LED substrate 13. Thereby, outer sides of the LED module 10 becomes bright, so that the luminance distribution on the visible part of the LED module 10 becomes uniform, and glare can be reduced. Further, since the substantially central portion of the LED module 10 becomes darker than the edge portion, the area where the luminance distribution on the visible part of the LED module 10 is felt uniform, in the glare zone φ, increases, and glare is felt low. Further, when the lens cover 40 is, for example, injection-molded from a material such as a resin, the material easily flows to the portions of the lenses 41 by providing the exposure 7808154.1 (GHMatters) P103292.AU 29 openings 47 at the sides near the edges 13A of the LED substrate 13, and the lens cover 40 can be easily formed. In the present embodiment, in the inside row, the high efficiency LEDs 11C are used for the inside LEDs 11B near the edge 13A of the LED substrate 13, and the exposure openings 47 are provided at the positions of the inside LEDs 11B with high efficiency.

[0044]

Further, the LED modules 10 are configured to be rotationally symmetrical. More specifically, the lens cover 40 is configured to be rotationally symmetrical with respect to the LED substrate 13. The lens cover 40 has connector grooves 48 that avoid the connector 12 of the LED substrate 13, and has the two connector grooves 48 with respect to the connector 12. Further, the LED substrate 13 has two holes in the central portion, one functions as the screw hole 14 corresponding to the screw hole 43 of the lens cover 40, and the other functions as the positioning hole 16 corresponding to the positioning boss 44 of the lens cover 40.

Since the LED modules 10 are configured to be rotationally symmetrical in this way, the LED modules 10 can be made common to the two mounting faces 5, so that the kinds of components are reduced, and a production process can be simplified. Further, the LED modules 10 are configured to distribute light to one side, and the LED modules 10 are disposed on the two mounting faces 5 7808154_1 (GHMatters) P103292.AU 30 which are provided back to back, to be rotationally symmetrical, whereby respective distant places in both directions of the traffic directions of the road surface can be irradiated, and therefore, a relatively wide range can be irradiated.

[0045]

In the LED module 10, the lights of the low efficiency LEDs 11D which are mainly disposed at the edge 13A of the LED substrate 13 are irradiated to a distant area via the lenses 41A. Further, the lights of the high efficiency LEDs 11C which are disposed at the inner side and correspond to the exposure openings 47 are irradiated to a nearly directly downward place via the exposure openings 47. The lights of the high efficiency LEDs 11C which are disposed at the inner side and correspond to the lenses 41B are irradiated to between the distant area and the directly downward area via the lenses 41B.

[0046]

Figure 14 is an explanatory view of light distribution of the crime prevention light 1.

The crime prevention light 1 which is configured as above can achieve Recommendation standards on crime prevention light "class B" (Public Service Corporation, Japan Security System Association, Technical Standards SES E1901-3) while reducing glare, at installation intervals of 38 m of the crime prevention lights 1. That is, as shown in Figure 14, the crime prevention light 1 7808154_1 (GHMatters) Pi 03292.AU 31 is disposed in a position at a height T of 4.5 meters from a road surface R of a street of a width of 5 meters, and can irradiate an area of an entire road surface ranging to a spot 19 meters ahead from a spot directly under the crime prevention light 1 along one direction of traffic directions S of the road surface R, by the single LED module 10.

Further, in the crime prevention light 1, the illuminance before eyes is 81 x or less, the equivalent veiling luminance is 0.2 cd/m2 or less, the maximum luminance of the lighting tool is 170,000 cd/m2 or less, and the average luminance of the lighting tool is 53,000 cd/m2, in the glare zone φ, and therefore, glare can be reduced as described above.

[0047]

As described above, according to the present embodiment, a plurality of LEDs 11 are disposed along the edge 13A of the LED substrate 13, the LEDs 11 are disposed at the inner side of these plurality of LEDs 11, and light outputs of the LEDs 11 at the inner side are configured to be made smaller than light outputs of the LEDs 11 at the outer side which are disposed along the edge 13A of the LED substrate 13. Since by the configuration, the substantially central portion of the LED module 10 becomes darker than the edge portion, the luminance distribution on the visual part of the LED module 10 becomes uniform, and glare can be reduced.

7808154_1 (GHMatters) P103292.AU 32

Further, since the substantially central portion of the LED module 10 becomes darker than the edge portion, the area where the luminance distribution on the visual part of the LED module 10 is felt uniform in the glare zone φ increases, and glare is felt low.

[0048]

Further, according to the present embodiment, the configuration is adopted, in which the lens cover 40 that has the lens 41 for each of the LEDs 11, and covers the LED substrate 13 is included, and the exposure openings 47 on which the LEDs 11 at the inner side are exposed are formed in the lens cover 40. By the configuration, the substantially central portion of the LED module 10 can be made sufficiently bright even when the light outputs of the plurality of inside LEDs 11B are made smaller than the light outputs of the plurality of outside LEDs 11A.

[0049]

Further, since according to the present embodiment, the exposure opening 47 is formed at the side near the edge 13A of the LED substrate 13, the outer side of the LED module 10 becomes bright, so that the luminance distribution on the visual part of the LED module 10 becomes uniform, and glare can be reduced. Further, for example, when the lens cover 40 is injection-molded from a material such as a resin, the material easily flows to the portions of the lenses 41 by providing the exposure 7808154.1 (GHMatters) P103292.AU 33 opening 47 at the side near the edge 13A of the LED substrate 13, and the lens cover 40 can be easily formed.

[0050]

Further, according to the present embodiment, the configuration is adopted, in which the LEDs 11 at the inner side are light-emitting elements with higher light-emitting efficiency than the LEDs 11 at the outer side.

By the configuration, the number of the LEDs 11 at the inner side can be decreased while sufficient light outputs are kept.

[0051]

Further, according to the present embodiment, the configuration is adopted, in which the LEDs 11 are disposed in the multiple rows, and in a zigzag state, so that interference of the lights of the LEDs 11 can be prevented, and illuminance unevenness can be prevented. Further, by decreasing the number of LEDs 11 at the inner side, it becomes easy to dispose the LEDs 11 in a zigzag state. Furthermore, when the lens cover 40 is injection-molded from a material such as a resin, for example, the lenses 41 are disposed in a zigzag state, whereby the material easily flows to the portions of the lenses 41, and the lens cover 40 can be easily formed.

[0052]

However, the aforementioned embodiment is one mode of the present invention, and it is needless to say that the present invention can be properly changed within the 7808154_1 (GHMatters) P103292.AU 34 range without departing from the gist of the present invention.

For example, in the aforementioned embodiment, the entire globe 4 is formed from the material having diffusibility, but the present invention is not limited to this.

The globe 4 generates relatively many upward luminous fluxes by diffusion, in the edge portion 4C (Figure 6) which is in a close vicinity to the LEDs 11. Thus, as in a globe 104 shown in Figure 15 and Figure 16, for example, diffusibility of an upward luminous flux diffusion portion (part) 104C that generates relatively many luminous fluxes upward from horizontality by diffusion may be made lower than in other parts. Thereby, upward luminous fluxes traveling upward which are not required of the crime prevention light 1 can be reduced.

In the example in Figure 16, the upward luminous flux diffusion portion 104C is illustrated as a portion up to an edge 104D located above the lens 41 which is the closest to the globe 104, but a range of the upward luminous flux diffusion portion 104C is not limited to this, as long as it is above the glare zone <j>. For example, an entire upper side from the lens 41 which is the closest to the globe 104 does not have to be set as the upward luminous flux diffusion portion 104C, and the upward luminous flux diffusion portion 104C may be set as 7808154_1 (GHMatters) P103292.AU 35 an edge portion (a part) of the globe 104 which does not include the edge 104D.

[0053]

Further, although in the aforementioned embodiment, the upper end 5A of the mounting face 5 and the power supply housing section 20 are connected in a planar shape, and the plurality of grooves 35 are formed in the outer edge portion 34 of the mounting face 5 to have a large wall thickness, the present invention is not limited to the configuration. For example, as in a device body 202 shown in Figure 17, the upper end 5A of the mounting face 5 and the power supply housing section 20 may be connected so as to have a concave portion 202D on the top face 2C of the device body 2. Since in this case, the outer edge portion 34 of the mounting face 5 is not thick-walled, the grooves 35 formed on the mounting face 5 can be omitted as shown in Figure 18.

[0054]

Further, in the aforementioned embodiment, the LEDs 11 are disposed in the multiple rows, but disposition of the LEDs 11 is not limited to this. For example, as shown in Figure 19 and Figure 20, the LEDs 11 may be disposed in a circular shape on an LED substrate 313. In this case, a plurality of LEDs 11 are disposed along an edge 13A of an LED substrate 113, the LEDs 11 are disposed at an inner side of these plurality of LEDs 11, and light outputs of the LEDs 11 at the inner inside are 7808154_1 (GHMatters) P103292.AU 36 2014367903 05 Dec 2016 configured to be made smaller than light outputs of the LEDs 11 at an outer side which are disposed along the edge 13A of the LED substrate 13. Further, the high efficiency LED 11C with high light-emitting efficiency are provided at the inner side. Furthermore, the LEDs 11 are disposed in multiple rows (three rows in the illustrated example) in a radial direction, and are disposed by shifting positions in a circumferential direction which is an arrangement direction.

[0055]

Further, although in the aforementioned embodiment, the crime prevention light 1 is illustrated as the illumination device according to the present invention, it is needless to say that the present invention is applicable to various illumination devices which are used outdoors or indoors.

Reference Signs List [0056] I Crime prevention light (illumination device) 13, 313 LED substrate (substrate) 13A Edge portion II LED (light-emitting element) 10 LED module (light-emitting element module) 40 Lens cover 41 Lens 47 Exposure opening

8390579_1 (GHMatters) P103292.AU 37 2014367903 05 Dec 2016 [0057]

Modifications within the scope of the invention may be readily effected by those skilled in the art. It is to be understood, therefore, that this invention is not limited to the particular embodiments described by way of example hereinabove.

[0058]

In the claims that follow and in the preceding description of the invention, except where the context requires otherwise owing to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, that is, to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.

[0059]

Further, any reference herein to prior art is not intended to imply that such prior art forms or formed a part of the common general knowledge in any country.

8390579_1 (GHMatters) P103292.AU

Claims

Claims

1. A light-emitting element module, wherein a plurality of light-emitting elements are disposed along an edge of a substrate, and a light-emitting element is disposed at an inner side of the plurality of light-emitting elements, and light output of the light-emitting element at the inner side is made smaller than light outputs of the light-emitting elements at an outer side which are disposed along the edge of the substrate, the light-emitting element module comprising a lens cover that has a lens for each of the light-emitting elements, and covers the substrate, wherein an exposure opening on which the light-emitting element at the inner side is exposed is formed in the lens cover.
2 . The light-emitting element module according to claim 1, wherein the exposure opening is formed at a side near the edge of the substrate.
3. The light-emitting element module according to either claim 1 or 2, wherein the light-emitting element at the inner side is a light emitting element with higher light-emitting efficiency than the light emitting elements at the outer side .
4. The light-emitting element module according to any one of claims 1 to 3, wherein the light-emitting elements are disposed in multiple rows, and in a zigzag state.
5. An illumination device, comprising: the light-emitting element module according to any one of claims 1 to 4.