JP2018113228A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire capable of securing central luminous intensity and ambient luminous intensity.SOLUTION: A luminaire 10 comprises a lamp body 11, a plurality of light sources 23, and a light control part 37. The plurality of light sources 23 is disposed on the lamp body 11. The light control part 37 has at least two types of reflectors 41 individually having cylindrical shapes and lengths in a light axis direction different from each other while expanding toward the light axis direction. The reflectors 41 individually face the light sources 23.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a lighting device using a plurality of light sources and a plurality of reflectors.

  Conventionally, lighting devices used in, for example, stadiums and sports facilities are installed far away from the illumination area and illuminate the illumination area from a distance, so a projector with a high output and a narrow light distribution angle is used. It has been.

  A light source using a light emitting element has also been adopted in such an illumination device. In this illuminating device, a plurality of light sources are arranged in the lamp body in order to secure a desired light beam, and a plurality of reflectors are arranged to control the light distribution angles of light emitted from these light sources. ing. And the reflector of the same structure which has the same light distribution characteristic is used for the several reflector.

  Therefore, the illuminating device has a light distribution with a central light intensity centered on the optical axis by a plurality of reflectors, or a light distribution with a peripheral light intensity ensured to have a wide light distribution even when the central light intensity is low. Either one of the light distribution.

  Therefore, the illuminating device has a light distribution with a central light intensity centered on the optical axis by a plurality of reflectors, or a light distribution with a peripheral light intensity ensured to have a wide light distribution even when the central light intensity is low. It was only possible to select a single light distribution.

Japanese Patent No. 58689797

  The problem to be solved by the present invention is to provide an illuminating device capable of ensuring the central luminous intensity and the peripheral luminous intensity.

  The lighting device of the embodiment includes a lamp, a plurality of light sources, and a light control unit. The plurality of light sources are disposed in the lamp body. The light control unit has at least two kinds of reflectors each having a cylindrical shape and expanding in the optical axis direction and having different lengths in the optical axis direction. The reflectors are respectively opposed to the light sources.

  According to the present invention, it can be expected to secure the central luminous intensity and the peripheral luminous intensity.

It is sectional drawing of the illuminating device which shows one Embodiment. It is a perspective view of an illuminating device same as the above. It is a front view of an illuminating device same as the above. It is a perspective view of the light source of an illuminating device same as the above.

  Hereinafter, an embodiment will be described with reference to FIGS. 1 to 4.

  1 to 3 show a projector as the illumination device 10. The illumination device 10 includes a lamp body 11, a support body 12 that supports the lamp body 11, and a power supply unit (not shown) for supplying power to the lamp body 11 (light source).

  The lamp body 11 includes a main body 15, a light source body 16 disposed on the rear side of the main body 15, and a light control body 17 disposed on the front side of the main body 15.

  The main body 15 is formed in an annular shape that opens forward and backward, for example, with a metal material. A wiring box portion 19 to which a power feeding cable from the power supply unit is wired is provided at the lower portion of the main body 15.

  The light source body 16 includes a plurality of light source units 21 and a mounting plate 22 to which these light source units 21 are integrally attached, and is attached to the rear side of the main body 15 by the mounting plate 22.

  Each light source unit 21 of the light source body 16 includes a light source 23 and a radiator 24 to which the light source 23 is attached.

  As shown in FIG. 4, the light source 23 is constituted by a COB (Chip On Board) module. The light source (COB module) 23 includes a substrate 25, a plurality of light emitting elements (LEDs) 26 mounted on the substrate 25, and a phosphor layer 27 that covers the light emitting elements 26. On the substrate 25, an annular frame-shaped portion 28 is provided around the mounting region of the light emitting element 26, and the phosphor layer 27 is filled inside the frame-shaped portion 28. The surface of the phosphor layer 27 is a light emitting surface 29 of a light emitting unit that emits light, and the light emitting surface 29 is circular and formed with a predetermined diameter D1. As shown in FIG. 1, the light source 23 is held by the light source holder 30 and attached to the front surface of the radiator 24 via a heat conductive sheet 31 having insulation properties. A circular light source opening 32 is formed in the center of the light source holder 30 so as to face the light emitting surface 29 of the light source 23 and expand forward.

  The radiator 24 is made of, for example, a metal material. The heat radiator 24 includes a flat heat radiation base 33 and a plurality of heat radiation fins 34 protruding from the back surface of the heat radiation base 33. A light source 23 is attached to the front surface of the heat dissipation base 33. The radiating fins 34 are arranged along the vertical direction, and a gap is provided between the radiating fins 34 for air to flow in the vertical direction.

  The mounting plate 22 of the light source body 16 is formed with an insertion hole 35 through which the light source 23 is inserted corresponding to the mounting position of each light source unit 21. The radiator 24 of each light source unit 21 is attached to the rear side of the attachment plate 22.

  In the present embodiment, six light sources 23 are used, five light sources 23 are arranged in the peripheral area of the lamp body 11 at equal intervals along the circumferential direction, and one light source 23 is a central area of the lamp body 11. It is arranged. These light sources 23 have the same configuration, that is, light sources 23 having the same size (diameter D1) are used. In the COB module as the light source 23, the larger the diameter D1 of the light emitting surface 29, the higher the light emission efficiency. Therefore, it is preferable to use the light emitting surface 29 having a larger diameter D1.

  The light control body 17 includes a light control unit 37, a case 38 that houses the light control unit 37, and a translucent cover 39 that covers the front surface of the case 38.

  The light control unit 37 includes a plurality of reflectors 41 used for light distribution control corresponding to each of the light sources 23 of the light source unit 21, and a reflector holder that integrally supports the reflectors 41 and attaches to the main body 15. 42.

  The reflector 41 of the light control unit 37 is made of, for example, a metal material. The reflector 41 has a cylindrical shape that opens forward and backward, and is formed in a paraboloid shape that expands in the optical axis direction (the direction of light emitted from the center of the light emitting surface 29 in the vertical direction is referred to as the optical axis direction). Yes. An incident opening 43 through which light enters is formed facing the light emitting surface 29 of the light source 23 on the rear end side of the reflector 41, and an emission opening 44 for emitting light is formed on the front end side of the reflector 41. .

On the inner surface of the reflector 41, a reflecting surface 45 constituted by a paraboloid that expands in the optical axis direction is formed. The reflection surface 45 is formed with an increased reflection film 46 in which a high refractive index film (TiO ₂ ) and a low refractive index film (SiO ₂ ) are laminated. The increased reflection film 46 has a high reflection efficiency for reflecting 90% or more (preferably 94% or more) of visible light.

  As the reflector 41, at least two kinds of reflectors 41 having different lengths in the optical axis direction are used. In the present embodiment, the length L1 in the optical axis direction is long and the reflector 41a has a narrow-angle light distribution (hereinafter referred to as a long reflector) and the length L2 in the optical axis direction is short and has a wider angle than the long reflector 41a. Two types are used: a light distribution reflector (hereinafter referred to as a short reflector) 41b.

  In the long reflector 41a, when the incident aperture diameter of the incident aperture 43 is D2a and the exit aperture diameter of the exit aperture 44 is D3a, the incident aperture diameter D2a is larger than the diameter D1 of the light emitting surface 29, and the exit aperture diameter D3a is The relationship is larger than the diameter D2a.

  In the short reflector 41b, when the incident aperture diameter of the incident aperture 43 is D2b and the exit aperture diameter of the exit aperture 44 is D3b, the incident aperture diameter D2b is larger than the diameter D1 of the light emitting surface 29, and the exit aperture diameter D3b is The relationship is larger than the diameter D2a.

  The incident aperture diameter D2a of the long reflector 41a is larger than the incident aperture diameter D2b of the short reflector 41b, and the exit aperture diameter D3a of the long reflector 41a is larger than the exit aperture diameter D3b of the short reflector 41b. That is, the long reflector 41a generally has a larger diameter (opening diameter) than the short reflector 41b.

  The long reflector 41a is divided into two, a rear-side incident-side reflector 47 having an incident aperture 43 and a front-side exit-side reflector 48 having an exit aperture 44, and these are integrally combined. The long reflector 41a may be integrally formed without being divided into two.

  Each reflector 41 is disposed in front of each light source 23. In the present embodiment, five long reflectors 41 a are arranged in front of five light sources 23 arranged in the peripheral area of the lamp body 11, and one light source 23 arranged in the central area of the lamp body 11. One short reflector 41b is disposed in front of the first reflector 41b.

  The case 38 of the light control body 17 is made of, for example, a metal material and is formed in a cylindrical shape that opens forward and backward and expands from the rear side toward the front side, and the rear end side is attached to the front surface of the main body 15. A circular irradiation opening 50 is formed on the front end side of the case 38. A plurality of reflectors 41 are accommodated in the case 38.

  The translucent cover 39 of the light control body 17 is made of, for example, transparent glass and has a disk shape. The peripheral portion of the translucent cover 39 is disposed at the front end of the case 38 via the sealing material 52, and the translucent cover 39 is fixed to the front end of the case 38 by caulking the front end of the case 38.

  Further, the support body 12 supports the lamp body 11 so as to be rotatable, and the lamp body 11 is installed on an installation part such as a structure. The support 12 includes an installation portion 54 and a pair of arm portions 55 bent from both sides of the installation portion 54. The installation part 54 is fixed to a construction or the like with bolts or the like. The tip of the arm portion 55 is rotatably connected to a shaft member protruding from both sides of the main body 15, and supports the lamp body 11 including the main body 15 about the shaft member so as to be rotatable. The arm portion 55 is provided with a handle 56 for fastening and fixing the lamp body 11 to the arm portion 55. Then, by loosening the handle 56, the lamp body 11 can be rotated with respect to the arm portion 55, and the direction of light irradiation from the lamp body 11 can be adjusted.

  In the illumination device 10 configured as described above, when lighting power is supplied from the power supply unit to each light source 23, each light source 23 emits light, and light emitted from the light emitting surface 29 of each light source 23 is reflected by the reflector 41. , The light whose light distribution is controlled by each reflector 41 passes through the light-transmitting cover 39 and is irradiated onto the illumination area.

  Among the multiple reflectors 41, the long reflector 41a has a long length L1 in the optical axis direction, so the light is controlled with a narrow-angle light distribution, and the short reflector 41b has a short length L2 in the optical axis direction. The light is controlled to have a wider-angle light distribution than the long reflector 41a.

  Therefore, the central luminous intensity can be secured by the light controlled to the narrow-angle light distribution by the plurality of long reflectors 41a, and the peripheral luminous intensity can be secured by the light controlled to the wide-angle light distribution by the short reflector 41b. it can. And the illumination rate to an illumination area | region can be improved by controlling light distribution only by the reflector 41, without using a lens etc.

  In addition, since the COB module used for the light source 23 has a characteristic that the luminous efficiency is higher as the diameter D1 of the light emitting surface 29 is larger, the diameter D1 of the light emitting surface 29 is larger in order to increase the appliance efficiency of the lighting device 10. Is preferably used. However, as the diameter D1 of the light emitting surface 29 increases, the light distribution angle tends to increase.

  There are projectors that use lenses to narrow the light distribution angle, but the surface of the lens shines, so the amount of light leaking outside the illumination area to be illuminated increases, and the illumination rate to the illumination area (light source 23) The ratio of the luminous flux reaching the illumination area in the total luminous flux is reduced.

  In order to increase the illumination rate to the illumination area with less leakage light, it is preferable to use only the reflector 41 without using a lens, but to narrow the light distribution angle, it is necessary to use the reflector 41 having a large aperture diameter. There is.

  In the illuminating device 10 of the present embodiment, the long reflector 41a having a long length L1 in the optical axis direction has a large aperture diameter of the exit opening 44, and the short reflector 41b having a short length L2 in the optical axis direction has a length of the exit opening 44. The opening diameter is small. Further, by using a combination of the light source 23 having a large diameter D1 of the light emitting surface 29 and the long reflector 41a of the exit opening 44 having a large aperture diameter, the light distribution angle can be narrowed and the instrument efficiency (light source 23) can be reduced. The ratio of the luminous flux radiated to the outside of the apparatus is high), and the illumination rate to the illumination area can be increased.

  If the long reflector 41a is used for all the reflectors 41 arranged in the lamp body 11, that is, the long reflector 41a is also used for the reflector 41 arranged in the central area in the lamp body 11. In this case, it is necessary to increase the outer diameter of the lamp 11, and the lighting device 10 is increased in size. Further, in order to prevent the outer diameter of the lamp body 11 from becoming large, when the light source 23 and the reflector 41 are not arranged in the central area in the lamp body 11, it is possible to secure a luminous flux necessary for the lighting device 10. There are cases where it is not possible.

  In the illuminating device 10 of the present embodiment, the short diameter reflector 41b having a small opening diameter of the light source 23 and the emission opening 44 is disposed in the central region in the lamp body 11, thereby suppressing an increase in the outer diameter of the lamp body 11. However, the luminous flux necessary for the illumination device 10 can be ensured.

  And according to the illuminating device 10 of this embodiment, by using two types of reflectors 41 having different lengths in the axial direction, that is, a long reflector 41a with a narrow-angle light distribution and a short reflector 41b with a wide-angle light distribution. By using this, the central luminous intensity and the peripheral luminous intensity can be ensured.

  Further, the long reflector 41a having a long length L1 in the optical axis direction has a large opening diameter of the exit opening 44, and the short reflector 41b having a short length L2 in the optical axis direction has a small opening diameter of the exit opening 44. Therefore, two types of reflectors 41 having different opening diameters of the emission openings 44 are used, and the illumination rate to the illumination area can be improved while suppressing the enlargement of the lamp body 11 and securing the luminous flux.

  Further, since the number of long reflectors 41a in the lamp body 11 is larger than the number of short reflectors 41b, the illumination device 10 having a narrow angle light distribution can be provided.

  Further, by arranging a plurality of long reflectors 41a in the peripheral area in the lamp body 11 and arranging a short reflector 41b in the central area, a plurality of long reflectors are provided in the lamp body 11 of a limited size. The reflector 41a and the short reflector 41b can be efficiently and effectively arranged. That is, the short reflector 41b can be disposed by effectively utilizing the dead space formed between the plurality of long reflectors 41a disposed in the peripheral area of the lamp body 11.

  In addition, by arranging a plurality of long reflectors 41a in the peripheral area in the lamp body 11 and a short reflector 41b in the central area, the light distribution angle by the short reflector 41b is distributed by the long reflector 41a. Even if it is wider than the light angle, an axially symmetric light distribution shape can be obtained.

  Further, only the light source 23 in the peripheral area in the lamp body 11 is turned on to obtain a narrow-angle light distribution, or only the light source 23 in the central area of the lamp body 11 is turned on to obtain a wide-angle light distribution. The light distribution can be switched.

  Further, the plurality of light sources 23 of the lamp body 11 have the same configuration of the light emitting surface 29, that is, by using the same light source 23, the light source 23 can be shared, and the manufacturability of the lighting device 10 can be improved. Can be improved.

  Further, since the reflection surface 45 of the reflector 41 is formed with the high reflection efficiency increasing film 46 in which the high refractive film and the low refractive film are laminated, the appliance efficiency of the lighting device 10 is increased, The spread of light distribution is small and the light distribution angle can be narrowed.

  Further, since the reflector 41 is made of a metal material, it is possible to prevent deterioration even if the light energy of the light source 23 is large.

  In addition, five long reflectors 41a are disposed in the peripheral area of the lamp body 11, and one short reflector 41b is disposed in the central area, so that the interior of the lamp body 11 can be used efficiently and effectively. Although the body 41a can be disposed, depending on the type of output of the lighting device 10, for example, six or more or four or less long reflectors 41a may be disposed in the peripheral area.

  One or more short reflectors 41b may be disposed in the peripheral area within the lamp body 11. In this case, every two long reflectors 41a and short reflectors 41b may be arranged in the peripheral area in the lamp body 11, or the peripheral area in the lamp body 11 is divided into predetermined areas. You may set up.

  Alternatively, only the plurality of short reflectors 41b may be provided in the peripheral area in the lamp body 11, and the long reflector 41a may be provided in the central area. In this case, the central luminous intensity can be secured while the overall light distribution of the illumination device 10 is a wide-angle light distribution.

  Further, the types of the reflectors 41 having different axial lengths are not limited to two types, and may be three or more different lengths. Then, by combining a plurality of types of reflectors 41, it is possible to arbitrarily set the light distribution and to efficiently arrange each reflector 41 in the lamp body 11.

  Further, as the plurality of light sources 23, light sources 23 that emit light having different color temperatures may be used. In this case, the light source 23 having a high color temperature may be combined with the long reflector 41a, and the light source 23 having a low color temperature may be combined with the short reflector 41b, or vice versa.

  Further, it is preferable that the direct light of the light source 23 that is directly emitted from the emission opening 44 without entering the reflecting surface 45 of the short reflector 41b is emitted outside without being blocked by the long reflector 41a. In this case, the short reflector 41b may be configured such that direct light is not blocked by the long reflector 41a by setting the length in the optical axis direction, the aperture diameter, the positional relationship with the long reflector 41a, and the like. If comprised in this way, the light taken out outside will increase and an illumination rate can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10 Lighting equipment
11 Lamp
23 Light source
37 Light control unit
41 Reflector

Claims (2)

With lamps;
A plurality of light sources disposed in the lamp;
A light control unit having at least two kinds of reflectors each having a cylindrical shape and expanding in the optical axis direction and having different lengths in the optical axis direction, and these reflectors respectively facing the light sources;
An illumination device comprising: A plurality of the light sources are arranged in the peripheral area of the lamp body and one in the central area,
Among the plurality of types of reflectors, the reflector having a long length in the optical axis direction is opposed to the light source in the peripheral area of the lamp body, and the reflector having a short length in the optical axis direction is the lamp body. The lighting device according to claim 1, wherein the lighting device faces the light source in a central area.

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