JP6539665B2 - Sports lighting equipment - Google Patents

Description

The present invention relates to a sports luminaire comprising a plurality of planar light sources.

BACKGROUND ART With the background of high efficiency and high output of light emitting elements such as LEDs, there are known lighting fixtures provided with a plurality of high power type light sources. In this type of luminaire, a structure has been proposed in which a plurality of LEDs (light emitting diodes) are provided as a light source, and an optical member in which an area of a Fresnel lens is formed corresponding to each of the LEDs. 1).
In this patent document 1, the refractive type Fresnel lens is formed concentrically with respect to the center of each LED, and the light emitted from each LED to the Fresnel lens is controlled by each Fresnel lens.

JP 2012-94494 A

However, the light distribution of the LED is generally Lambertian light distribution (cosine light distribution), and largely diffused around the optical axis. Therefore, in the configuration of Patent Document 1, there is a problem that the light distribution characteristic is deteriorated because the light of the LED is incident not only on the facing Fresnel lens but also on another Fresnel lens.
In order to address this problem, it is possible to make most of the light of the LED incident on the facing Fresnel lens by arranging the Fresnel lens close to the LED, but if doing so, the influence of heat generation of the LED This makes it easy for the Fresnel lens to receive the light, which also hinders the high output of the lighting equipment.
The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a sports lighting apparatus capable of maintaining desired light distribution characteristics while facilitating high output.

This specification includes the entire contents of Japanese Patent Application No. 2014-183971 filed on September 10, 2014.
In order to achieve the above object, according to the present invention, there is provided a sports lighting apparatus comprising: a plurality of planar light sources; and a Fresnel lens provided for each of the planar light sources, the planar light source and the Fresnel lens Each pair is provided with a reflecting mirror for reflecting the light of the planar light source to the Fresnel lens forming a pair with the planar light source, and a gap between the Fresnel lens and the reflecting mirror is a Fresnel corresponding to the planar light source. A gap formed by suppressing the length of the reflecting mirror to such a length that direct light of the planar light source does not enter the central portion of the Fresnel lens adjacent to the lens, the planar shape from the planar light source Direct light in a predetermined range centered on the optical axis of the light source, and indirect light emitted from the planar light source and reflected by the reflecting mirror include the main light flux emitted toward the front of the Fresnel lens It becomes outgoing light As described above, a region including the central portion of the Fresnel lens is formed in the refractive lens portion, and direct light from the predetermined range from the planar light source and other planar light sources adjacent to the planar light source The area away from the central portion of the Fresnel lens is such that the incident direct light becomes a light component having a spread around the main luminous flux of the outgoing light through one or more reflections and / or refractions. It characterized that you have been formed on the reflective lens unit. ,

  Further, according to the present invention, in the above-mentioned lighting device, the planar light source and the center of the Fresnel lens are disposed on the optical axis of the reflecting mirror, and the planar light source is disposed at a position corresponding to the optical axis And a light emitting element.

Further, the present invention is characterized in that, in the above sports illumination device, each of the planar light sources is disposed at a position shifted in the optical axis direction from the focal point of the corresponding Fresnel lens.

Further, the present invention is characterized in that, in the above-mentioned sports lighting apparatus, the plurality of Fresnel lenses are formed on a single lens plate.

Further, according to the present invention, in the above sports illumination device, the plurality of planar light sources are a planar light source disposed at the center, and n planar light sources disposed around the planar light source, The Fresnel lens corresponding to the arranged planar light source is characterized in that it is formed in an n-shape.

Further, according to the present invention, in the above sports lighting device, a case provided with the planar light source and the reflecting mirror inside, a heat radiating portion exposed to the outside of the case for each planar light source, and the heat radiating portion are protected. The rear guard member is characterized in that the upper opening area is larger than the lower opening area.

Further, according to the present invention, in the above sports lighting device, the planar light source is a COB type LED, and the output of the lighting device is 0.7 to 1.0 W / cm ^{2 with} respect to the pressure receiving area of the lighting device. It is characterized by being.

According to the present invention, since the planar light source is provided as the light source, the output of the luminaire can be increased compared to a normal point light source.
In addition to this, the light from the planar light source is reflected by the reflecting mirror to the Fresnel lens that forms a pair with the planar light source regardless of the distance to the Fresnel lens, and thus enters the other Fresnel lens. The light will be suppressed and the light distribution characteristics of the luminaire will be maintained at the desired characteristics based on the optical design of the Fresnel lens.
Further, since the Fresnel lens can be disposed apart from the planar light source, the Fresnel lens can be less susceptible to the heat generation of the planar light source.

FIG. 1 is a front view of a sports lighting apparatus according to the present embodiment. FIG. 2 is a side view of a sports lighting fixture. FIG. 3 is a perspective view showing the sports lighting device from diagonally above. FIG. 4 is a perspective view showing the sports lighting device from diagonally above by shifting the optical member of the front cover forward. FIG. 5 is a view showing an internal structure (V-V cross section of FIG. 1) of the instrument body. FIG. 6 is a view schematically showing the optical member together with the reflecting mirror and the COB type LED from the front. FIG. 7 is a view for explaining the light distribution control of the sports lighting fixture, and FIG. 7 (A) is a view showing the light distribution by the COB type LED, the reflector and the Fresnel lens in FIG. It is a figure showing luminous intensity distribution from a central Fresnel lens. FIG. 8 is a view for explaining the positional relationship between the Fresnel lens and the COB type LED. FIGS. 8A and 8B show a reference example, and FIG. 8C shows this configuration. FIG. 9 is a view showing the back guard member, FIG. 9 (A) is a view from above, and FIG. 9 (B) is a view from below. FIG. 10 is a view of the heat removal unit of each light source module as viewed from the back side along with the peripheral configuration. FIG. 11 is a view showing light distribution by a COB type LED, a reflecting mirror, and a Fresnel lens according to a modification. FIG. 12 is a view showing a modification of the Fresnel lens, and FIG. 12 (A) is a basic size of the Fresnel lens, and FIG. 12 (B) is an array of the Fresnel lenses of FIG. FIG. 12C is a view showing an optical member in which three Fresnel lenses in FIG. 12A are arranged in the left and right direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a sports lighting apparatus 1 according to the present embodiment, FIG. 2 is a side view of the sports lighting apparatus 1, and FIG. 3 is a perspective view of the sports lighting apparatus 1 as viewed obliquely from above.
This sports lighting fixture 1 is a lighting fixture that illuminates an outdoor ball stadium or an outdoor stadium from the spectator seat side, and is also referred to as a light projector. As shown in FIGS. 1 to 3, the sports lighting apparatus 1 is roughly divided into an instrument body 2, a mounting arm 3, and a back guard member 4.

The instrument main body 2 includes a bottomed cylindrical casing 10 whose front surface is open, a plurality of (six in this configuration) light source modules 12 (FIG. 5 described later) provided in the casing 10, and the casing 10. And a front cover 14 covering the front. The light source modules 12 each include a COB type LED 51 which is an example of a planar light source, and the light of each COB type LED 51 is emitted forward through the front cover 14.
The light output of the plurality of light source modules 12 is designed such that the total brightness thereof is equal to or greater than the brightness required by a sport played in a ball field or stadium to be illuminated. Of course, the sports lighting apparatus 1 can be used for lighting not only ball games and stadiums, but also other outdoor sports facilities and the like.

  The mounting arm 3 is a mounting member for fixing the sports lighting device 1 to the installation surface, and has a function of rotatably supporting the device body 2. Specifically, the mounting arm portion 3 includes a U-shaped support frame 16 attached so as to sandwich the housing 10, and the support frame 16 is provided with a fixing plate 17. The sport light fixture 1 is fixed to the installation surface by bolting the fixing plate 17 to the installation surface.

  The back surface guard member 4 is a member that is attached to the housing 10 and covers and protects the rear portion (a heat radiating portion 55 described later) and the like of the light source module 12 exposed to the rear of the housing 10. The rear guard member 4 is formed in a bowl shape by bending the metal plate 4A having a large number of through holes into a polygonal shape, and ensures sufficient air permeability together with the rigidity that can withstand collisions with balls and the like. . By the outside air flowing through the back surface guard member 4, the light source module 12 and the like inside can be air cooled.

  As shown in FIG. 3, in the top panel portion 4B constituting the top of the back surface guard member 4, a large number of through holes are formed at multiple rows (two rows) and at a short pitch, and the opening area is made other We secure more widely than part. Therefore, the back guard member 4 can efficiently dissipate heat without disturbing the flow of the updraft generated by the heat generation of the light source module 12. In place of the metal plate 4A, the back guard member 4 may be configured by forming a large number of elongated guide rods in a lattice shape, a radial shape, or the like. Further, at the upper part of the instrument body 2, a gripping portion 5 is provided which is gripped when adjusting the irradiation direction of the instrument body 2 or the like.

The front cover 14 includes a disk-shaped optical member 21 (lens plate) covering the front opening 10A (FIG. 4) constituting the light emission opening of the housing 10, and a front frame 22 supporting the outer peripheral edge of the optical member 21. Have. The front cover 14 is fixed to the housing 10 by bolting the front frame 22 to the housing 10.
FIG. 4 is a perspective view showing the sport lighting device 1 from diagonally above by shifting the optical member 21 forward. The housing 10 is formed of a bottomed cylindrical aluminum die-cast component whose depth is shallow with respect to the diameter. The left and right sides of the housing 10 are provided with coupling pieces 30 projecting to the left and right, and the end 16A of the support frame 16 is rotatably coupled to the coupling pieces 30 so that the housing 10 can be vertically pivoted. It is supported by the support frame 16.

Further, the support frame 16 is provided with a stopper mechanism 32 which makes the coupling piece 30 unrotatable, and the case 10 is held at a predetermined angle with respect to the support frame 16 by the stopper mechanism 32. A scale 34 indicating a rotation angle is attached around the rotation axis of the support frame 16 on the coupling piece 30, and the operator accurately aligns the angle between the support frame 16 and the housing 10 with the scale 34 when installed. be able to.
A connection box 36 (see FIG. 2) is provided in the lower part of the housing 10. A power supply line (not shown) for supplying lighting power to each light source module 12 is connected to the wiring box 36, and lighting power is supplied to each light source module 12 through the wiring box 36.

As shown in FIG. 4, one reflecting mirror 40A is disposed at the center of the housing 10, and a plurality of (five) reflecting mirrors 40B, 40C, 40D, are equiangularly spaced around the reflecting mirror 40A. 40E and 40F are arranged. In the following description, the reflectors 40A to 40F are described as the reflector 40 when it is not necessary to distinguish them.
Each of the reflecting mirrors 40 is provided at each of the light source modules 12, which will be described in detail later. The reflecting mirrors 40 function as light reflecting members that reflect light from each light source module 12 toward the Fresnel lens 61 described later.
When viewed from the front of the housing 10, the position of the reflecting mirror 40 matches the light source position of each light source module 12. That is, in the sports lighting fixture 1, one light source module 12 is disposed at the center of the cylindrical casing 10, and a plurality of light source modules 12 are arranged around the light source module 12 at equal angular intervals based on the center of the casing 10 (5 ) Light source modules 12 are arranged.

FIG. 5 is a view showing the internal structure of the instrument body 2 and corresponds to the VV cross-sectional view of FIG.
As described above, the light source module 12 is a module including the COB type LED 51 in the light source, and includes the COB type LED 51, the base plate 53 to which the COB type LED 51 is attached, and the heat radiating portion 55.
The COB type LED 51 is a chip on board (Chip On Board) in which a large number of LEDs are densely arranged on the LED substrate 51A to form a planar light emitting surface 51B that emits a planar light substantially circular (may have a square shape) planar light. It is a light emitting device of Board (COB) structure, and its light distribution is Lambertian light distribution (cosine light distribution).
The COB type LED 51 is an LED light source with a large amount of light and high brightness because a large number of light emitting diode (LED) elements as light emitting elements are arranged closely.

  This COB type LED 51 is a white LED. Specifically, the COB type LED 51 includes a large number of LED elements and a phosphor resin that covers and seals the LED elements, and the phosphor resin becomes fluorescent by the light of the LED elements, and the fluorescence and the LED elements It mixes white light and emits white light. The COB type LED 51 is a blue LED in which the LED element emits blue light, and the phosphor resin contains a yellow phosphor that receives blue light and emits yellow fluorescence.

The base plate 53 is a substrate attachment member to which the COB type LED 51 is directly attached, and is a high thermal conductivity material. The COB type LED 51 is attached to the front surface of the base plate 53. The COB type LED 51 has an optical axis L in a direction perpendicular to the planar light emitting portion, and the optical axis L is attached to the base plate 53 in a posture to direct the front surface of the tool body 2.
The COB type LEDs 51 of each light source module 12 are arranged side by side on the same plane perpendicular to the optical axis L of the reflecting mirror 40, and the COB type LEDs 51 arranged at the center and the respective COB type LEDs 51 arranged at the periphery The distance is kept the same. Moreover, since each COB type LED 51 arrange | positioned around is arrange | positioned at equal angle intervals, the distance between these COB type LED 51 is also maintained at the same distance. For this reason, a plurality of COB type LEDs 51 are arranged at substantially equal intervals in the housing 10 of the tool main body 2, and it is possible to suppress the deviation of the light amount due to the dispersion of the arrangement.

  The heat dissipating unit 55 includes a heat dissipating fin 56 disposed outside the housing 10 and a heat pipe 57 for transferring the heat of the base plate 53 to the heat dissipating fin 56. With this configuration, the heat radiation fins 56 transmit the heat of the COB LED 51 transferred to the base plate 53 to the heat radiation fins 56 while extending the heat radiation fins 56 outward from the housing 10 by a length corresponding to the required heat radiation performance. Can communicate efficiently.

Next, the optical member 21 and the reflecting mirror 40 will be described in detail.
FIG. 6 is a view schematically showing the optical member 21 together with the reflecting mirror 40 and the COB type LED 51 from the front.
The optical member 21 is a single lens plate in which Fresnel lenses 61A, 61B, 61C, 61D, 61E, 61F are formed for each light source module 12, and around the central Fresnel lens 61A and the central Fresnel lens 61A. A plurality of (five) Fresnel lenses 61B to 61F provided at equal angular intervals are provided. The Fresnel lenses 61A to 61F are described as the Fresnel lens 61 when it is not necessary to distinguish them.

The COB type LEDs 51 of each light source module 12 correspond to the Fresnel lenses 61 one to one, and each Fresnel lens 61 is a reflecting mirror 40 provided between the COB type LEDs 51 corresponding to the Fresnel lenses 61. The lens is divided into concentric circles about the optical axis L (FIG. 5) to form a lens with reduced thickness (see FIG. 1), and the distance between each Fresnel lens 61 and each COB type LED 51 is also at least COB. The constant distance is set such that the Fresnel lens 61 does not receive the influence of the heat generation of the mold LED 51.
The light distribution characteristic of the Fresnel lens 61 is set to a characteristic having a predetermined spread angle such as an included angle, an intermediate angle, or a wide angle with respect to the optical axis L, for example. By doing this, the thickness and weight of the optical member 21 can be reduced.

As shown in FIGS. 5 and 6, each reflecting mirror 40 is provided between the corresponding COB LED 51 and the Fresnel lens 61 one by one, and the light of each COB LED 51 corresponds to the corresponding Fresnel lens. The light reflecting member 61 functions as a light reflecting member.
Each reflecting mirror 40 is in the form of a rotary body such as a paraboloid of revolution or a spheroid, and a reflecting surface 41 in the form of a paraboloid of revolution is formed on the inner surface thereof.
Each reflecting mirror 40 is made of a resin material as a base material and is coated with a reflecting material on the surface thereof, so that weight reduction is achieved as compared with the case of forming it from a metal material.
The reflecting surface 41 of each reflecting mirror 40 is subjected to mirror surface processing, and can efficiently reflect light incident from the COB type LED 51 disposed on the back side of the reflecting mirror 40 toward the front (optical member side) .
The central axis of the paraboloid of revolution is set to the optical axis L, and the reflecting surface 41 of each reflecting mirror 40 reflects light incident from the COB LED 51 toward the Fresnel lens 61 in a direction substantially parallel to the optical axis L.

In the sports lighting device 1, the center of the light emitting surface 51 of the COB LED 51 in a circular plan view and the center of the Fresnel lens 61 are disposed on the optical axis L of the reflecting mirror 40. In the light emitting surface 51 of the COB type LED 51, light emitting elements are disposed at positions corresponding to the optical axis L, and a large number of light emitting elements are disposed around the optical axis L. The light emitting surface 51 is designed to have an acceptable range of deviation of the light distribution characteristic even when the center is considered as a light emitting point in the optical design of the reflecting mirror 40 and the Fresnel lens 61. .
Thereby, even if the light source is a planar light source, in the optical design of the reflecting mirror 40 and the Fresnel lens 61, the center of the light emitting surface 51 of the COB LED 51 can be regarded as a light emitting point, Optical design of desired light distribution characteristics is facilitated.
Further, in the light emitting surface 51, since the light emitting element is also present around the optical axis L, an action to cause blurring in the irradiation field can be obtained, which also reduces glare and color unevenness, which will be described in detail later. Is taken.

These reflecting mirrors 40 are fixed to a base plate 53 (FIG. 5) to which the corresponding COB type LED 51 is attached via a reflecting mirror fixing tool (not shown), and surround the periphery except the front of the COB type LED 51 and from the COB type LED 51 Also extends forward.
Each reflecting mirror 40 has the same shape, and as shown in FIG. 6, the central Fresnel lens 61A is formed in a polygonal (pentagonal) lens shape in which the outer peripheral edge of the central reflecting mirror 40A is substantially inscribed. The surrounding Fresnel lenses 61B to 61F are formed in a substantially fan-shaped lens shape in which the outer peripheral edges of the surrounding reflecting mirrors 40B to 40F are substantially inscribed.

  That is, the outer peripheral edges of the reflecting mirrors 40A to 40F for reflecting the light of the COB type LED 51 to which the respective Fresnel lenses 61A to 61F correspond are formed substantially inscribed, in other words, each reflecting mirror 40A to 40F corresponds to each Fresnel lens 61A It is formed in an outer shape approximately inscribed in ~ 61F. For this reason, the light reflected by each reflective mirror 40A-40F can be efficiently entered into each Fresnel lens 61A-61F located in front of each reflective mirror 40A-40F.

  Further, as shown in FIG. 5, each Fresnel lens 61 is formed in the refractive lens portion 61K (hereinafter referred to as “refractive portion”) near the center where the optical axis L of the corresponding COB LED 51 passes, Is formed on a reflection type lens portion 61H (hereinafter, a reflection portion) provided with a ring-shaped prism. For this reason, the light of the outer peripheral portion which is not large in the horizontal direction because the refractive angle is too large with the refractive portion 61K alone can be incident on the reflective portion 61H, and can be bent horizontally using the total reflection by the prism. It becomes easy to set the light distribution angle appropriately.

FIG. 7 is a view for explaining the light distribution control of the sports lighting device 1. FIG. 7 (A) is a view showing the light distribution by the COB type LED 51, the reflecting mirror 40 and the Fresnel lens 61 in FIG. (B) is a diagram showing the light intensity distribution from the central Fresnel lens 61A.
As shown in FIG. 7A, the direct light L1 in the range of the view angle θA (60 degrees in this configuration) centered on the optical axis L from the COB LED 51 corresponds to the Fresnel lens 61A corresponding to the COB LED 51. , And travel substantially parallel to the optical axis L by the Fresnel lens 61A. Furthermore, the indirect light L2 emitted from the COB type LED 51 and reflected by the reflecting mirror 40A enters the Fresnel lens 61A and is emitted forward of the Fresnel lens 61A.
In addition, although illustration is abbreviate | omitted, direct light L1 of COB type LED 51 corresponding to each Fresnel lens 61B-61F injects also about the other Fresnel lenses 61B-61F similarly to the said Fresnel lens 61A, and each Fresnel While advancing substantially parallel to the optical axis L by the lenses 61B to 61F, the indirect light L2 reflected by the reflecting mirrors 40B to 40F enters and is emitted forward from the Fresnel lenses 61B to 61F.

Thus, in addition to the direct light L1 of the COB type LED 51 corresponding to each Fresnel lens 61, the indirect light L2 reflected by the reflecting mirror 40 is also incident on each Fresnel lens 61, and thus the reflecting mirror 40 is not provided. Compared to the above, it is possible to increase the light incident on each Fresnel lens 61 from the corresponding COB type LED 51. In other words, the light incident from the COB type LED 51 to the Fresnel lens 61 not paired with the COB type LED 51 is suppressed, so the light distribution characteristic by the optical design of the Fresnel lens 61 and the distribution of the sports lighting fixture 1 Deviation from light characteristics can be suppressed.
Further, as shown in FIG. 7A, the indirect light L2 reflected by each of the reflecting mirrors 40 is incident on the reflecting portion 61H formed on the outer peripheral portion of each of the Fresnel lenses 61. For this reason, the light is emitted as a light component having a spread in the direction of the optical axis L through one or a plurality of reflections and / or refractions by each of the reflection portions 61H. Thereby, the irradiation light of each reflecting mirror 40 is separated in the irradiation field, generation of a dark part (low illuminance part) between the irradiation places of each reflecting mirror 40 is prevented, and glare in the irradiation field is reduced.

Further, in the sports lighting apparatus 1, the light source module 12 is configured as follows in order to further enhance the glare reduction effect.
That is, as shown in FIG. 7A, a part of the direct light from the COB type LED 51, that is, an area shown by hatching in FIG. 7A, between each Fresnel lens 61 and each reflecting mirror 40. A gap SA is provided to leak the direct light L3 which exceeds the estimated angle θA of The direct light L3 leaked from the gap SA is incident on the adjacent Fresnel lens 61. The direct light L3 is refracted by the adjacent Fresnel lens 61 and emitted at an angle with respect to the optical axis L of the emitted light.
Taking the central Fresnel lens 61A as an example, the direct light L3 (shown by a broken line in FIG. 7A) from the COB LED 51 corresponding to the adjacent Fresnel lenses 61B to 61F (see FIG. 6) is the central Fresnel. The light is incident on the lens 61A. FIG. 7 shows that direct light L3 from the two COB type LEDs 51 corresponding to the Fresnel lenses 61B and 61E is incident on the central Fresnel lens 61A.

Thus, as illustrated in FIG. 7B, it is possible to emit light (corresponding to the diffusion component in FIG. 7B) having a spread around the main light flux of the emitted light. The broken line in FIG. 7B indicates the light intensity distribution when the gap SA is not formed.
Further, the gap SA (see FIG. 7A) is a gap where direct light (L4 in FIG. 7A) of the adjacent COB type LED 51 is not incident on the central portion (refractive portion 61K) of the Fresnel lens 61. It is formed.

That is, the gap SA has a length such that direct light L3 of the COB LED 51 does not enter the central portion (refractive portion 61K) of the Fresnel lens 61 adjacent to the Fresnel lens 61 corresponding to the COB LED 51. It is formed by reducing the length of
For this reason, the leaked direct light L3 from the adjacent COB type LED 51 is incident on a portion (reflecting portion 61H) outside the central portion of the Fresnel lens 61, and reflected or refracted one or more times by the reflecting portion 61H. As a result, the light component having a spread around the main luminous flux of the emitted light can be efficiently emitted, and the diffusion component in FIG. 7B can be efficiently enhanced.
As an example of the surrounding Fresnel lens 61, the Fresnel lens 61B will be described by way of example. Directly from the three COB type LEDs 51 corresponding to the Fresnel lenses 61A, 61C, 61F (see FIG. 6) adjacent to the Fresnel lens 61B. The light L3 enters the reflecting portion 61H of the Fresnel lens 61B.

As a result, light having a spread around the main luminous flux of the emitted light is emitted also from the Fresnel lens 61 B, and the difference in the emission surface luminance of the entire front cover 14 is reduced, so the above-described glare in the irradiation field is reduced. It becomes possible to make it a lighting fixture. Moreover, glare is effectively suppressed without designing such that the distance between the reflecting mirrors 40 is reduced so that the irradiation light of the reflecting mirrors 40 overlap in the irradiation field.
Furthermore, since the gap SA is provided at the central portion of the Fresnel lens 61 so that the direct light L3 of the adjacent COB LED 51 does not enter, the light distribution characteristic by each Fresnel lens 61 is deteriorated by the direct light L3. I have nothing to do.

By the way, since the Fresnel lens 61 of this configuration is a lens obtained by dividing a plano-convex lens concentrically, one surface is formed into a sawtooth uneven surface 61X, and the surface opposite to the uneven surface 61X is a flat surface 61Y. It is formed.
Generally, when making light from a light source into parallel light using this type of plano-convex type Fresnel lens, the Fresnel lens is disposed with the uneven surface directed to the opposite side of the light source. On the other hand, in the present configuration, as shown in FIG. 7 and the like described above, the uneven surface 61X of the Fresnel lens 61 is disposed toward the side of the COB type LED 51 that constitutes the light source. Furthermore, in this configuration, each of the COB type LEDs 51 is disposed at a position shifted in the optical axis L direction from the focal point F ′ of the corresponding Fresnel lens 61 (FIG. 8C described later). The reason will be described below.

FIG. 8 is a view for explaining the positional relationship between the Fresnel lens 61 and the COB type LED 51, FIGS. 8A and 8B show a reference example, and FIG. 8C shows this configuration.
FIG. 8A shows the case where the uneven surface 61X of the Fresnel lens 61 is disposed toward the opposite side of the COB LED 51 constituting the light source, and the COB LED 51 is disposed at the focal point F of the Fresnel lens. . The focal point F is a focal point existing on the flat surface 61Y side of the Fresnel lens 61, and corresponds to a point intersecting the optical axis L when light parallel to the optical axis L is incident on the uneven surface 61X of the Fresnel lens 61. ing. Further, in the drawing, reference symbol LF indicates the focal length to the focal point F of the Fresnel lens 61.
According to this arrangement, the light emitted from the COB LED 51 can be accurately refracted by the Fresnel lens 61 into light parallel to the optical axis L. However, in this arrangement, in the case where the COB type LED 51 has color unevenness such as a yellow ring, the influence thereof becomes strong.

  More specifically, as described above, this COB type LED 51 is configured by sealing a blue LED with a yellow phosphor resin. In this configuration, the yellow fluorescent color becomes too strong according to the difference in the path when the light emitted from the light emitting surface of the blue LED passes through the yellow phosphor, and white light can not be obtained even by mixing with blue light. Yellow light. For this reason, in addition to white light, yellow light will be included in the irradiation light, and a yellowish spot (so-called yellow ring) will occur on the irradiation surface irradiated with the irradiation light. Or, there is a possibility that the color development failure of the irradiated body may be caused.

FIG. 8B shows a case where the COB type LED 51 is shifted from the focal point F in the direction of the optical axis L as compared with FIG. 8A. According to this arrangement, since the COB type LED 51 is arranged at a position shifted from the focal point F, it is possible to blur the edge of the luminous flux cross section of the light emitted from the Fresnel lens 61. For this reason, when COB type LED 51 has color unevenness, such as a yellow ring, the influence can be suppressed effectively.
Further, as described above, the diffusion of the direct light L3 by the Fresnel lens 61 also blurs the edge, so that the color unevenness can be suppressed more reliably.
However, since the COB LED 51 can not be largely separated from the focal point F in order to emit light parallel to the optical axis L to some extent, when the focal distance LF of the Fresnel lens 61 is long, the COB LED 51 and the Fresnel lens 61 The separation distance LX becomes long, which causes the sports lighting apparatus 1 to be enlarged.

On the other hand, as shown in FIG. 8C, when light parallel to the optical axis L is incident on the focal point F 'existing on the irregular surface 61X side of the Fresnel lens 61, that is, the plane 61Y of the Fresnel lens 61. The point of intersection with L approaches the Fresnel lens 61 side compared to the focal point F. In the figure, the symbol LF 'indicates the focal length to the focal point F' of the Fresnel lens 61. In the Fresnel lens 61 of this configuration, the focal length LF 'is approximately half of the focal length LF.
Therefore, as shown in FIG. 8C, the inventors pointed the uneven surface 61X of the Fresnel lens 61 toward the COB LED 51 and shifted the COB LED 51 from the focal point F 'in the optical axis L direction. By arranging at the position, the influence of color unevenness such as yellow ring is suppressed, and the separation distance LX between the COB type LED 51 and the Fresnel lens 61 is shortened, and the sports lighting apparatus 1 is miniaturized.

As described above, according to the present embodiment, the following effects can be obtained.
The sports lighting apparatus 1 according to the present embodiment includes a plurality of COB type LEDs 51 as a light source, so that a high output apparatus can be obtained as compared to the case where a normal LED is used as a light source.
For example, if a surface mount device (SMD) LED package is adopted, the amount of light per package is small, a large amount of packages is required, and the density of each LED element is physically large. It leads to the enlargement. In this embodiment, since the COB package is adopted to increase the density per element, the size, weight, and pressure receiving area of the appliance (the area receiving the wind pressure of the luminaire, and the front face constituting the light emission port (Equivalent to the area of the opening 10A) can be reduced.

The inventors used the sport lighting apparatus 1 to make the HID (High Intensity)
Discharge lamp) A high power projector equivalent to 2 kW has been realized. The dimensions and the like of the sports lighting apparatus 1 in this case are as follows.
The width (indicated by reference numeral LA in FIG. 1) of the sports lighting fixture 1 is 557 mm, the depth (indicated by reference numeral LB in FIG. 2) is 460 mm, and the height (indicated by reference LC in FIG. 2) is 557 mm. (Shown by reference numeral LD in FIG. 2) is 461 mm. The power consumption of the sports lighting device 1 is 1240 W, the light flux of the device is 135000 lm, and the pressure receiving area which is the area of the front opening 10A is 0.17 m ² . The output of the COB LED 51 was 0.729 W / cm ² (= 1240 W / 0.17 m ² ) relative to the pressure receiving area. As a result of investigations by the inventors, it is preferable to set the output of the COB type LED 51 to 0.7 to 1.0 W / cm ² with respect to the pressure receiving area from the viewpoint of downsizing, weight reduction and reduction of the pressure receiving area. It was fine.

In addition to this, the light of each of the COB type LEDs 51 is reflected by the reflecting mirror 40 to the Fresnel lens 61 forming a pair with the COB type LED 51 regardless of the distance to the Fresnel lens 61. The light entering the Fresnel lens 61 is suppressed. Thereby, the light distribution characteristic of the sports lighting device 1 is maintained at the desired characteristic based on the optical design of the Fresnel lens 61.
Further, since the Fresnel lens 61 can be disposed apart from the COB LED 51, the Fresnel lens 61 can be less susceptible to the heat generation of the COB LED 51.

Further, according to the present embodiment, the center of the light emitting surface 51 of the COB LED 51 in a circular plan view and the center of the Fresnel lens 61 are disposed on the optical axis L of the reflecting mirror 40, and the light emission of the COB LED 51 In the surface 51, the light emitting element is disposed at a position corresponding to the optical axis L.
Thereby, even if the light source is a planar light source, in the optical design of the reflecting mirror 40 and the Fresnel lens 61, the center of the light emitting surface 51 of the COB LED 51 can be regarded as a light emitting point, Optical design of desired light distribution characteristics is facilitated.
Further, in the light emitting surface 51, since the light emitting element is also present around the optical axis L, an action to cause blurring in the irradiation field can be obtained, and glare and color unevenness in the irradiation field can be reduced.

  Further, in the present embodiment, since the gap SA is provided between the Fresnel lens 61 and the reflecting mirror 40, the direct light L 3 leaks and enters the Fresnel lens 61 adjacent to the reflecting mirror 40 from the gap SA. Then, the direct light L3 is refracted by the Fresnel lens 61 and emitted at an angle with respect to the optical axis L of the emitted light. For this reason, it is possible to irradiate light having a spread around the main luminous flux of the outgoing light.

  In the present embodiment, the reflecting mirror 40 has such a length that direct light of the COB LED 51 does not enter the central portion (refractive portion 61 K) of the Fresnel lens 61 adjacent to the Fresnel lens 61 corresponding to the COB LED 51. Since the gap SA is provided with a reduced length, the leaked direct light L3 is incident on a portion (reflecting portion 61H) outside the central portion of the Fresnel lens 61, and is a light component having a spread with respect to the main light flux of the outgoing light Is efficiently enhanced. In addition, since the length of the reflecting mirror 40 is suppressed to provide the gap SA, the sports lighting apparatus 1 can be easily miniaturized.

  Moreover, in the present embodiment, each of the COB type LEDs 51 is arranged at a position shifted in the direction of the optical axis L from the focal point F 'of the corresponding Fresnel lens 61. When the edge is blurred and the COB type LED 51 has color unevenness such as a yellow ring, this can be effectively suppressed.

Further, in the present embodiment, since the Fresnel lenses 61A, 61B, 61C, 61D, 61E and 61F for each light source module 12 are formed on a single lens plate, it is easy to make compact and easy to attach and detach. . Further, the Fresnel lenses 61A, 61B, 61C, 61D, 61E and 61F are integrally molded.
Alternatively, the Fresnel lenses 61A, 61B, 61C, 61D, 61E and 61F may be separately formed and joined to each other to form one lens plate. However, as compared with the case where the integral molding is performed separately, the bonding operation can be omitted, and the variation in the positions of the Fresnel lenses 61A, 61B, 61C, 61D, 61E, and 61F can be easily suppressed.

  Further, in the present embodiment, since the upper opening area of the back surface guard member 4 is secured wider than the other parts, efficiently from the upper part of the tool where the heat of the heat radiating portion 55 of the light source module 12 is concentrated Heat can be dissipated, and efficient heat convection can be realized. Thereby, it becomes advantageous to size reduction and weight reduction of the sports lighting fixture 1, and also it becomes possible to reduce wattage by improving the heat radiation efficiency, which is advantageous to energy saving.

Further, this sports lighting apparatus 1 has the following configuration from the viewpoint of heat dissipation improvement.
FIG. 9 is a view showing the back surface guard member 4, FIG. 9 (A) is a view as viewed from above, and FIG. 9 (B) is a view as viewed from below. Moreover, FIG. 10 is the figure which looked at the heat removal part 55 of each light source module 12 from the back side with peripheral structure.
As shown in FIGS. 3 and 9A, the back guard member 4 is similar to the top panel 4B in all of the upper panel 4C including the top panel 4B (except for the left and right panels 4D). A relatively large number of through holes (indicated by reference numeral 7A in FIG. 9A) having a relatively large opening area are formed over almost the entire surface.
On the other hand, as shown in FIG. 3 and FIG. 9B, the back guard member 4 has a relatively small opening area in all the left and right panel portions 4D and the lower panel portion 4E (see FIG. In 9 (B), a large number is formed over almost the entire surface (indicated by reference numeral 7B).

  Thereby, the air permeability of the entire periphery of the back surface guard member 4 is secured, and the opening ratio per unit area of the upper panel portions 4B and 4C is larger than that of the side and lower panel portions 4D and 4E. It is formed. Accordingly, the rear guard member 4 has a larger opening area on the upper side than the side and lower opening areas. According to this configuration, as shown in FIG. 10, the outside air around the rear guard member 4 is allowed to pass through the side and lower panel portions 4D and 4E to exchange heat with the heat dissipation portion 55, and heat is raised to the upper side. A flow (indicated by an arrow in FIG. 10) can be generated to efficiently discharge heat without interfering with the upward air flow of exhausting from the panel portions 4B and 4C.

The through holes 7A and 7B are formed in an elongated shape extending over the width of each of the panel portions 4A to 4E (length along the circumferential direction of the back guard member 4), and the length in the short side direction of each is 10, it is formed to a length that efficiently generates the flow indicated by the arrow in FIG. In the present embodiment, the flow can be efficiently generated by setting the lengths of the short sides of the through holes 7A and 7B to 10 mm for the through holes 7A and 6 mm for the through holes 7B. The length in the short side direction of the elongated shape is not limited to the above value, and the through hole 7A may be in the front-rear range based on 1.5 times the through hole 7B.
Moreover, in order to form the flow of the air flow that does not interfere with the rising air flow, at least the back guard member 4 may have a larger opening area on the upper side than the lower opening area. Therefore, the side panel portion 4D is not limited to the through hole 7B having a relatively small opening area, and the size of the through hole may be changed according to the installation situation.

Moreover, as shown in FIG. 10, the radiation fin 56 which the heat removal part 55 of each light source module 12 has is formed in the vertical fin extended in an up-down direction. Thus, the heat dissipating fins 56 do not disturb the flow of the rising air flow generated around the heat dissipating part 55, and heat can be exchanged efficiently with the outside air.
Furthermore, as shown in FIG. 10, the plurality of heat radiating portions 55 arranged around the center of the housing 10 are arranged at equal angular intervals and are arranged mutually offset in the lateral direction without being aligned in the vertical direction Be done. As a result, the hot air warmed and raised by the lower heat radiating portion 55 (indicated by the arrow in FIG. 10) is unlikely to be blocked by the other heat radiating portion 55 located above. Also by this, it is possible to exhaust heat efficiently without disturbing the updraft.

  The embodiment described above merely illustrates one aspect of the present invention, and any modification and application can be made without departing from the spirit of the present invention.

For example, in the embodiment described above, the uneven surface 61X of the Fresnel lens 61 is directed to the COB LED 51 side, and the COB LED 51 is disposed at a position deviated from the focus F ′ in the optical axis L direction. It is not limited to this. For example, in the case where the focal length LF (FIG. 8A) to the focal point F present on the plane 61Y side of the Fresnel lens 61 is relatively short, the arrangement similar to FIG. The flat surface 61Y may be directed to the side of the COB LED 51, and the COB LED 51 may be disposed at a position shifted from the focal point F in the direction of the optical axis L.
A specific example in this case is shown in FIG. In FIG. 11, the same parts as those described above are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 11, even in the arrangement in which the uneven surface 61X of the Fresnel lens 61 is directed to the opposite side to the COB type LED 51, the following effects are provided as in the above embodiment.
That is, since the reflecting mirror 40 which injects the light of COB type LED51 into the Fresnel lens 61 is provided for every COB type LED51, deterioration of a light distribution characteristic can be suppressed. Further, due to the gap SA between the Fresnel lens 61 and the reflecting mirror 40, the direct light L3 leaking to the adjacent Fresnel lens 61 is incident, and this direct light L3 is refracted by the Fresnel lens 61 and is directed to the optical axis L of the outgoing light. It is emitted with an angle. For this reason, it is possible to irradiate light having spread around the main luminous flux of the outgoing light, and it can be used as a so-called surface light source. Further, since the leaked direct light L3 is incident on a portion (reflecting portion 61H) outside the central portion (refractive portion 61K) of the Fresnel lens 61, the light component having a spread with respect to the main light flux of the outgoing light is efficiently Be enhanced.

  Moreover, although COB type LED 51 was illustrated as an example of LED in embodiment mentioned above, not only this but arbitrary LED can be used. Moreover, as a light emitting element, arbitrary light emitting elements, such as organic EL other than LED, can be used. Although the case where six light source modules 12 are used has been described, the number of light source modules 12 may be changed according to the required brightness.

  In the embodiment described above, the case where the central Fresnel lens 61A is formed into a pentagon is shown, but when the number of surrounding COB type LEDs 51 is six, it is formed into a hexagonal shape. It may be formed in a corresponding polygonal shape. In other words, the central Fresnel lens 61A may be formed in an n-shape corresponding to the number (= n) of the COB LEDs 51 arranged at equal intervals around the COB LED 51 arranged at the center. Further, not only the polygonal shape but also the central Fresnel lens 61A may be changed to a circular shape.

  In addition to forming the basic size of each Fresnel lens 61 into a pentagon, the size of the Fresnel lens 61 corresponding to the aperture diameter of the reflecting mirror 40 of the light source module 12, the distance of the gap SA, etc. Depending on the incident range of the light and the direct light of the COB type LED 51, if optical conditions such as the distance to the adjacent Fresnel lens 61 are secured, the change can be made appropriately. For example, a square or the like may be used as a basic size, and a plurality of shapes may be arranged in the lateral direction, or an optical member 21 (lens plate) may be formed in a plurality of rows vertically.

FIG. 12 is a view showing a modified example of the Fresnel lens 61. FIG. 12 (A) is a basic size of the Fresnel lens 61, and FIG. 12 (B) is three rows of the Fresnel lens 61 of FIG. The arranged optical members 21 and FIG. 12C show the optical members 21 in which three Fresnel lenses 61 in FIG. 12A are arranged on the left and right.
As shown in FIGS. 12A and 12B, when the shape of the Fresnel lens 61 is a square, a rectangular optical member 21 in which the Fresnel lenses 61 are arranged in three rows vertically and horizontally is a basic size. Thus, the optical member 21 corresponding to the COB type LED 51 provided in three rows vertically and horizontally can be obtained. In addition, inside each Fresnel lens 61, the reflective mirror 40 which injects the light from COB type LED51 into the Fresnel lens 61 is each arrange | positioned. In FIG. 12B, the positions of the COB type LED 51 corresponding to the Fresnel lens 61 located at the corner (the corner on the upper left of the sheet) and the reflecting mirror 40 are indicated by broken lines. The same applies to the lens 61.

  Further, as shown in FIG. 12C, by forming a rectangular optical member 21 in which three square Fresnel lenses 61 are arranged on the left and right sides, a rectangle corresponding to the three COB type LEDs 51 provided on the left and right is provided. A shaped optical member 21 can be obtained. In FIG. 12C, the positions of the COB type LED 51 corresponding to the Fresnel lens 61 located at the corner (the corner on the left side of the sheet) and the reflecting mirror 40 are indicated by broken lines. The same is true for 61.

Moreover, in the embodiment mentioned above, although the case where sports lighting equipment 1 was installed and used outdoors was illustrated, it does not restrict to this. That is, the fixture body 2 of the sports lighting fixture 1 may be used by being fixed so as to illuminate the area directly below the gymnasium or ceiling surface.
The present invention is of course applicable not only to sports lighting fixtures, but also to lighting fixtures used in various outdoor or indoor lightings. In particular, it can be suitably used for a luminaire which is installed and installed on the ceiling surface or wall of a factory and needs to protect the luminaire from the collision of a work vehicle.

1 Sports lighting equipment (lighting equipment)
2 Apparatus body 4 Rear guard member 10 Case 10A Front opening (light exit)
12 light source module 14 front cover 21 optical member (lens plate)
40, 40A to 40F Reflective mirror 41 Reflective surface 51 COB type LED (planar light source)
55 heat radiating portion 61, 61A to 61F Fresnel lens 61K refracting portion 61H reflecting portion F, F 'focal point L optical axis L3 direct light

Claims (7)

A sports lighting apparatus comprising: a plurality of planar light sources; and a Fresnel lens provided for each of the planar light sources,
The planar light source and a reflector for reflecting the light of the planar light source to the Fresnel lens forming a pair with the planar light source are provided for each pair of the Fresnel lens ,
The gap between the Fresnel lens and the reflecting mirror is set to a length such that direct light of the planar light source does not enter the central portion of the Fresnel lens adjacent to the Fresnel lens corresponding to the planar light source. The gap formed by reducing the length,
Direct light from the planar light source in a predetermined range centered on the optical axis of the planar light source, and indirect light emitted from the planar light source and reflected by the reflecting mirror are in front of the Fresnel lens An area including the central portion of the Fresnel lens is formed in the refractive lens portion so as to be an emitted light including the main luminous flux emitted toward the
The direct light outside the predetermined range from the planar light source and the direct light incident from the other planar light source adjacent to the planar light source undergo one or more reflections and / or refractions. said to be a light component having a spread around the main beam of the emitted light, sports luminaire region distant from the center of the Fresnel lens is characterized in that that have been formed on the reflective lens unit. The planar light source and the center of the Fresnel lens are disposed on the optical axis of the reflecting mirror,
The sports lighting fixture according to claim 1, wherein the planar light source comprises a light emitting element disposed at a position corresponding to the optical axis. The sports lighting fixture according to claim 1 or 2 , wherein each of the planar light sources is disposed at a position shifted in the optical axis direction from the focal point of the corresponding Fresnel lens. The sports lighting fixture according to any one of claims 1 to 3 , wherein a plurality of the Fresnel lenses are formed on a single lens plate. The plurality of planar light sources are a planar light source disposed at the center and n planar light sources disposed around the planar light source,
The sports lighting fixture according to claim 4 , wherein the Fresnel lens corresponding to the planar light source disposed at the center is formed in an n-shape. A housing provided with the planar light source and the reflecting mirror therein; a heat radiating portion exposed to the outside of the housing for each planar light source; and a back guard member protecting the heat radiating portion.
The sports lighting fixture according to any one of claims 1 to 5 , wherein the rear guard member secures the upper opening area larger than the lower opening area. The planar light source is a COB type LED,
The sports luminaire according to any one of claims 1 to 6 , wherein an output of the luminaire is 0.7 to 1.0 W / cm ² with respect to an instrument pressure receiving area.

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