JP2014207080A - Solid lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid lighting device capable of suppressing degradation in energy efficiency and emitting illumination light of a large amount of light from a cylindrical support.SOLUTION: A solid lighting device comprises: a plurality of solid light sources; a plurality of light paths; a power supply portion; a plurality of electrical wiring portions; a lamp portion; and a cylindrical support. The plurality of solid light sources emit laser beams at wavelengths of ultraviolet light to blue light. The plurality of electrical wiring portions connect the power supply portion to the solid light sources, respectively. The lamp portion includes a heat sink and a wavelength conversion layer. The wavelength conversion layer absorbs the laser beams from the respective solid light sources and emits wavelength-converted beams at wavelengths larger than those of the laser beams, and scatters the respective laser beams and emits the laser beams as scattered beams. The cylindrical support includes an inner space accommodating therein the power supply portion, the electrical wiring portions, the plurality of light paths, and the lamp portion. The respective light paths have lengths at which transmission loss is not more than 30% for the wavelengths of the laser beams.

Description

  Embodiments described below generally relate to solid state lighting devices.

  Solid-state lighting (SSL) devices that use solid-state light emitting elements such as LEDs (Light Emitting Diodes), LDs (Laser Diodes), and OLEDs (Organic Light Emitting Diodes) are highly efficient, long-life, and automatic lighting control. Etc. are possible. For this reason, various uses are spreading.

  When a wavelength conversion material such as a phosphor is irradiated with blue light from an LED or LD, light having a wavelength longer than that of blue light can be obtained. For this reason, white illumination light can be obtained as mixed light.

  However, when LEDs are used, chip heat generation and droop are problematic. For example, droop is a phenomenon in which the light output is saturated or decreased as the current density increases, and it occurs even if the influence of heat generation is small.

  On the other hand, the LD is a solid state light emitting device without droop. When an LD is used as a solid state light emitting device, the light divergence angle is narrow, so that laser light can be efficiently incident on the wavelength conversion layer. Further, when an optical fiber is used as the optical path, the wavelength conversion layer separated from the LD can be irradiated while maintaining a narrow light divergence angle, so that the temperature of the lamp unit can be reduced. However, since the optical fiber has a large transmission loss with respect to blue light, its length is limited.

JP 2007-52957 A

  The problem to be solved by the present invention is to provide a solid state lighting device in which a decrease in energy efficiency is suppressed and a large amount of illumination light can be irradiated from a cylindrical column.

  The solid-state lighting device according to the embodiment includes a plurality of solid-state light sources; a plurality of light paths; a power supply unit; a plurality of electrical wiring units; a lamp unit; The plurality of solid light sources emit laser light having a wavelength of ultraviolet light to blue light. The plurality of optical paths propagate the laser light introduced to the incident end and emit the laser light from the exit end. The plurality of electrical wiring portions connect the power source and the plurality of solid state light sources, respectively. The lamp unit includes a heat sink and a wavelength conversion layer provided on the heat sink. The wavelength conversion layer absorbs laser light from the plurality of solid-state light sources, emits wavelength-converted light having a wavelength longer than the wavelength of the laser light, and scatters and emits the laser light as scattered light. To do. The cylindrical support column portion is provided with an internal space for storing the power supply unit, the electrical wiring unit, the plurality of light paths, and the lamp unit. Each optical path has such a length that the transmission loss is 30% or less at the wavelength of the laser beam.

  According to the embodiment of the present invention, it is possible to provide a solid state lighting device in which a decrease in energy efficiency is suppressed and a large amount of illumination light can be irradiated from a cylindrical support column.

FIG. 1A is a schematic perspective view of the interior of the solid state lighting device according to the first embodiment, and FIG. 1B is a schematic perspective view thereof. It is a model perspective view of the solid-state lighting device concerning a comparative example. It is a model perspective view inside the solid-state lighting device concerning 2nd Embodiment. FIG. 4A is a schematic diagram of a configuration in which the irradiation direction of the solid state lighting device according to the second embodiment is horizontal, and FIG. 4B is a schematic diagram of a configuration in which the irradiation direction is directed downward.

A first invention is a solid-state lighting device including a plurality of solid-state light sources; a plurality of light paths; a power supply unit; a plurality of electrical wiring units; a lamp unit; The plurality of solid light sources emit laser light having a wavelength of ultraviolet light to blue light. The plurality of optical paths propagate the laser light introduced to the incident end and emit the laser light from the exit end. The plurality of electrical wiring portions connect the power source and the plurality of solid state light sources, respectively. The lamp unit includes a heat sink and a wavelength conversion layer provided on the heat sink. The wavelength conversion layer absorbs laser light from the plurality of solid-state light sources, emits wavelength-converted light having a wavelength longer than the wavelength of the laser light, and scatters and emits the laser light as scattered light. To do. The cylindrical support column portion is provided with an internal space for storing the power supply unit, the electrical wiring unit, the plurality of light paths, and the lamp unit. Each optical path has such a length that the transmission loss is 30% or less at the wavelength of the laser beam.
According to this solid-state lighting device, the lamp portion can be provided at a high place or a separated position of the cylindrical support post portion. As a result, even if the lamp parts are separated, the energy efficiency is kept high and a large amount of light such as white light can be illuminated. In addition, the solid state lighting device can be stably set up, and the solid state light source unit can be housed inside to prevent theft or destruction.

A second invention is a solid state lighting device comprising: a plurality of solid state light sources; a plurality of light paths; a power supply unit; a plurality of electrical wiring units; a lamp unit; The plurality of solid light sources emit laser light having a wavelength of blue-violet light to red light. The plurality of optical paths propagate the laser light introduced to the incident end and emit the laser light from the exit end. The plurality of electrical wiring portions connect the power source and the plurality of solid state light sources, respectively. The lamp unit includes a heat sink, and a light scattering layer provided on the heat sink, and a light scattering layer in which a light scattering material that scatters laser light from the plurality of solid light sources and turns into scattered light is dispersed. The cylindrical support column portion is provided with an internal space for storing the power supply unit, the electrical wiring unit, the plurality of light paths, and the lamp unit. Each optical path has such a length that the transmission loss is 30% or less at the wavelength of the laser beam.
According to this solid-state lighting device, the lamp portion can be provided at a high place or a separated position of the cylindrical support post portion. As a result, even when the lamp parts are separated from each other, energy efficiency is kept high, and low-coherent bluish-purple to red light illumination is possible. In addition, the solid state lighting device can be stably erected, and the solid state light source unit can be housed inside to prevent theft or destruction.

According to a third invention, in the first or second invention, the cylindrical support column includes metal, an inner wall of the cylindrical support column facing the internal space includes a flat portion, and the plurality of solid state light sources are It is a solid-state lighting device distributed and arranged in the flat part of the inner wall.
According to this solid state lighting device, the heat dissipation is further enhanced.

A fourth invention is the solid-state lighting device according to any one of the first to third inventions, wherein the optical path is a quartz optical fiber.
According to this solid-state lighting device, laser light can be efficiently transmitted to the lamp unit.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the solid-state lighting in which a radiating fin is provided on an outer edge of the cylindrical support column portion on the side opposite to the inner wall that is the flat portion. Device.
According to this solid state lighting device, the heat dissipation is further enhanced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
FIG. 1A is a schematic perspective view of the interior of the solid state lighting device according to the first embodiment, and FIG. 1B is a schematic perspective view thereof.
The solid-state lighting device includes a plurality of solid-state light sources 60, a plurality of light paths 70, a power supply unit 20, a plurality of electric wiring units 80, a lamp unit 38, and a cylindrical column unit 50.

  The plurality of solid-state light sources 60 are semiconductor laser modules or solid-state lasers that emit laser beams. In FIG. 1A, a plurality of solid state light sources 60 have nitride semiconductor lasers and emit eight semiconductor laser modules 1, 2, 3, 4, 5 that emit ultraviolet to blue (380 to 490 nm) light. , 6, 7, and 8. When a semiconductor laser is used, the laser beam has a sharp directivity of 40 degrees (θv: full-width half-value of far-field image) × 25 degrees (θh: full-width half-value of far-field image). For this reason, it is possible to efficiently enter the optical path such as an optical fiber and propagate the laser light to the spaced apart lamp portions 38.

  When the semiconductor laser modules 1 to 8 each have a lens or the like inside, it becomes easy to further increase the incident efficiency to the optical fiber. Moreover, the semiconductor laser modules 1 to 8 may each have a drive circuit.

  The plurality of optical paths 70 propagate the laser light introduced into the incident end and emit it from the exit end. In FIG. 1A, a plurality of optical paths 70 are optical fibers 11-18. Laser light BL such as blue light from the semiconductor laser modules 1 to 8 propagates through the optical fibers 11 to 18 provided in the internal space 50a of the cylindrical column 50, and is then coupled by the optical component (combiner) 10. . The optical fibers 11 to 18 are made of quartz or the like, and can have a core diameter of 200 μm or the like.

  The power supply unit 20 can be provided at the bottom of the cylindrical support column 50. The electrical wiring unit 80 connects the power supply unit 20 and the semiconductor laser modules 1 to 8 respectively.

  The lamp unit 38 includes at least the heat sink 40 and the wavelength conversion layer 30. The heat sink 40 is preferably a metal such as copper having a high thermal conductivity. The laser beam BL emitted from the optical component (combiner) 10 irradiates the wavelength conversion layer 30 provided on the surface of the convex portion at the center of the heat sink 40. If a reflective layer is provided between the heat sink 40 and the wavelength conversion layer 30, the light extraction efficiency can be increased.

  The wavelength converted light YL emitted from the wavelength conversion layer 30 that has absorbed the laser light BL and the scattered light SL scattered by the wavelength conversion layer 30 are mixed and emitted as illumination light GT in the entire peripheral direction. When the wavelength conversion layer 30 includes a yellow phosphor, the wavelength-converted light YL that is yellow light and the scattered light SL that is blue light emit white light as illumination light GT.

  The cylindrical support column 50 is provided with an internal space 50 a and accommodates the power supply unit 20, the plurality of electrical wiring units 80, the plurality of light paths 70, and the lamp unit 38. The cylindrical support column 50 is made of metal or the like. The inner wall 50b of the cylindrical support column 50 includes a flat portion 50c.

  The semiconductor laser modules 1 to 8 are distributed and arranged on the flat portion 50 c of the cylindrical support column 50. In FIG. 1A, two semiconductor laser modules are provided on one flat portion 50b with a distance (for example, 20 cm vertically) at which thermal interference can be ignored.

  In this case, for example, a window can be provided in the cylindrical support column 50, and a metal plate with two semiconductor laser modules attached can be inserted from the window and fixed internally by YAG (Yttrium Aluminum Garnet) laser welding or the like. . After that, when the metal plate and the cylindrical support column 50 are welded, the solid light source unit 60 can be housed inside and theft and destruction can be prevented.

  Radiation fins 52 can be provided on the outer edge on the side opposite to the inner wall 50b of the cylindrical column 50 to which the metal plate is attached. If it does in this way, the heat which occurred with semiconductor laser modules 1-8 can be discharged outside efficiently. If the four flat portions 50c are provided in a distributed manner on the inner wall 50b, the heat generated by the semiconductor laser modules 1 to 8 can be discharged in all directions without forced air cooling.

The wavelength conversion layer 30 absorbs scattered light and emits wavelength converted light having an emission spectrum including a wavelength longer than the wavelength of the scattered light. The wavelength conversion layer 30 is made of, for example, a nitride-based phosphor such as (Ca, Sr) ₂ Si ₅ N ₈ : Eu, (Ca, Sr) AlSiN ₃ : Eu, or Cax (Si, Al) ₁₂ (O, N). ) ₁₆ : Eu, (Si, Al) ₆ (O, N) ₈ : Eu, BaSi ₂ O ₂ N ₂ : Eu, BaSi ₂ O ₂ N ₂ : Eu and other oxynitride phosphors, Lu ₃ Al ₅ O ₁₂ : Ce, (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce, (Sr, Ba) ₂ SiO ₄ : Eu, Ca ₃ Sc ₂ Si ₃ O ₁₂ : Ce, Sr ₄ Al ₁₄ O ₂₅ : Eu or other oxide-based phosphors, (Ca, Sr) S: Eu, CaGa ₂ S ₄ : Eu, ZnS: Cu, Al or other sulfide-based phosphors, etc., or at least one kind A phosphor mixed as described above can be used.

  If the laser light BL is blue light and the wavelength conversion layer 30 contains a yellow phosphor, white light can be emitted as the illumination light GT. Further, white light can be emitted even if the wavelength of the laser beam BL is ultraviolet to blue light and the wavelength conversion layer 30 includes R (red), G (green), and B (blue) phosphors.

  The transmission loss of the quartz optical fiber is lower than that of the plastic optical fiber. However, the transmission loss for blue light is as large as about 30 dB / km. That is, when transmitting 50 m, the transmission loss is approximately 30% (corresponding to approximately 1.55 dB). This is because Rayleigh scattering increases as the wavelength is shorter. Since it is important to maintain high energy efficiency in the illumination light, the transmission loss is preferably 30% or less.

  In the first embodiment, in the optical fibers 11 to 18 constituting the optical path 70, the light intensity at the exit end of the optical fibers 11 to 18 is 70% of the light intensity at the incident end at the wavelength of the laser light BL (transmission loss is substantially reduced). (Corresponding to 1.55 dB). In this case, in FIG. 1A, for example, the incident end 13a of the optical fiber 13 is connected to the semiconductor laser module 3, and the emission end 13b is connected to the optical component 10.

  That is, the upper limit of the length Lf of the optical fibers 11 to 18 that transmit blue light is 50 m. When the lamp portion 38 is provided at the tip of the cylindrical support column 50 having a length of 50 m or more, the incident ends (for example, 13a) of the optical fibers 11 to 18 connected to the semiconductor laser modules 1 to 8 respectively Electrical wiring portions 21 to 28 having a length Le are provided. As a result, the lamp section 38 is obtained by using the optical path 70 having a length Lf and the electric wiring section 80 having a length Le for a desired length (in the case of 50 m or more) of the cylindrical support 50. Can be lit. As a result, energy efficiency can be kept high without increasing transmission loss in the optical fiber.

  In the first embodiment, the power supply unit 20 and the electrical wiring units 21 to 28 are provided on the bottom of the cylindrical column 50, and the heat sink 40 and the optical fibers 11 to 18 are provided on the top of the cylindrical column 50. For this reason, a solid-state lighting device can be erected stably.

  The heat generated in the lamp unit 38 is mainly equivalent to the conversion loss of the wavelength conversion layer 30. The generated heat is discharged from the heat sink 40 to the outside. Since the wavelength conversion layer 30 made of a thin phosphor layer or the like has a low thermal resistance, the heat can efficiently reach the heat sink 40 and enhance the heat dissipation. For this reason, the temperature rise of the wavelength conversion layer 40 is small. If heat sink fins are provided on the heat sink 40, heat dissipation can be further enhanced.

  Further, since the semiconductor laser modules 1 to 8 are separated from the heat sink 40, the lamp portion 38 can be reduced in size and weight. On the other hand, in an illumination device using a blue LED array as a solid-state light source unit, the LED array and the wavelength conversion layer are close to each other, and heat is generated in both, so that the temperature rise increases.

  The lamp unit 38 may have a light scattering layer on the heat sink 40. The solid-state light source unit 60 emits laser light BL having a blue-violet to red wavelength (400 to 750 nm). The laser light BL is irradiated with a light scattering material arranged in a dispersed manner in the light scattering layer, and is scattered to become scattered light SL. In this way, the illumination light GT with low coherence and enhanced safety can be emitted.

The light-scattering layer is a glass plate, transparent resin plate, ceramic plate, or the like coated with a light-scattering material made of fine particles such as Al ₂ O ₃ , Ca ₂ P ₂ O ₇ , BaSO _4, and the like. Can do.

FIG. 2 is a schematic perspective view of a solid-state lighting device according to a comparative example.
The solid state lighting device includes a solid light source unit 160, an optical fiber unit 170, and a lamp unit 138.

  The solid-state light source unit (light engine) 160 includes eight semiconductor lasers 101 to 108, eight lenses 191 to 198, and a drive circuit 200. The semiconductor lasers 101 to 108 are coupled to optical fibers 111 to 118 constituting the optical fiber unit 170 via lenses 191 to 198, respectively.

  The lamp unit 138 includes a heat sink 140, a wavelength conversion layer 130 provided on the heat sink 140, and a direction conversion optical unit 110 provided so as to cover the wavelength conversion layer 130. The direction conversion optical unit 110 is made of a light guide, guides the laser light BL introduced from the lower surface by total reflection on the slope, and irradiates the wavelength conversion layer 130. The wavelength conversion layer 130 absorbs the laser light BL and emits the wavelength conversion light YL having a wavelength longer than the wavelength of the laser light BL upward. Further, the scattered light SL generated by scattering in the direction conversion optical unit 110 or in the wavelength conversion layer 130 is emitted above the direction conversion optical unit 110. The wavelength converted light YL and the scattered light SL are mixed to become the illumination light GT.

  If several hundreds of semiconductor lasers are arranged to form a large light quantity lamp exceeding tens of thousands of lumens, the solid-state light source unit 160 becomes large and the amount of heat generation increases.

  Further, in the solid state lighting device in which the solid light source unit 160 and the lamp unit 138 are separated, the solid light source unit 160 may be destroyed or stolen.

  On the other hand, in 1st Embodiment, since the semiconductor laser modules 1-8 are disperse | distributed and attached in the cylindrical support | pillar part 50 which consists of metals, heat dissipation is improved. Further, by keeping the distance between the semiconductor laser modules 1 to 8 properly, the heat dissipation effect can be enhanced without forced air cooling.

  Moreover, since the internal space 50a of the cylindrical support | pillar part 50 has the attachment area | region of the semiconductor laser modules 1-8 widely, the external space which provides the solid light source part 60 becomes unnecessary. Furthermore, the cylindrical support | pillar part 50 can prevent destruction, theft, etc. by accommodating the solid light source part 60 which is the principal part of a solid-state lighting device inside.

FIG. 3 is a schematic perspective view of the interior of the solid-state lighting device according to the second embodiment.
The solid-state lighting device includes a plurality of solid-state light source units 60, a plurality of optical paths 70, a power source unit 20, a plurality of electrical wiring units 80, a lamp unit 38, a cylindrical support column unit 50, and a reflector 54. Have. The plurality of solid-state light source units 60 are semiconductor laser modules 1 to 8 that emit laser beams BL, respectively. The plurality of optical paths 70 are optical fibers 11 to 18.

  One end face 10a of the optical component (combiner) 10 is formed as an oblique cut surface, and the laser beam BL is totally reflected to change the direction. For this reason, the laser beam BL irradiates the wavelength conversion layer 30 provided on the heat sink 40. The wavelength-converted light YL and the scattered light SL scattered by the wavelength conversion layer 30 are collected by the reflector 54 and become illumination light GT, which irradiates the axial direction of the reflector 54.

FIG. 4A is a schematic diagram of a configuration in which the irradiation direction of the solid state lighting device according to the second embodiment is horizontal, and FIG. 4B is a schematic diagram of a configuration in which the irradiation direction is directed downward.
In FIG. 4A, the angle α of the oblique cut surface, the inclination of the wavelength conversion layer 30, and the inclination of the reflector 54 are determined so that the optical axis OA of the illumination light GT is substantially horizontal.

  4B, the angle α degree of the oblique cut surface, the inclination of the wavelength conversion layer 30, and the inclination of the reflector 54 are determined so that the optical axis OA of the illumination light GT faces downward. If it does in this way, the lower part can be irradiated from the lamp part 38 in a high position.

  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.

  1-8 Semiconductor laser module (solid light source), 10 Optical component (combiner), 11-18 Optical fiber (optical path), 20 Power supply unit, 21-28, 80 Electrical wiring unit, 30 Wavelength conversion layer, 38 Lamp unit, 40 Heat sink, 50 cylindrical strut part, 50a inner space, 50b inner wall, 50c flat part, 52 radiation fin, 54 reflector, 60 solid light source part, 70 optical path, 80 electrical wiring part, BL laser light, YL wavelength conversion light, SL Scattered light, length of Lf optical fiber, length of Le electrical wiring part, GT illumination light

Claims (5)

A plurality of solid-state light source units that emit laser light having a wavelength of ultraviolet to blue light;
A plurality of optical paths for propagating the laser light introduced to the incident end and emitting from the exit end;
A power supply;
An electrical wiring section connecting the power supply section and the plurality of solid state light source sections;
A lamp unit having a heat sink and a wavelength conversion layer provided on the heat sink, wherein the wavelength conversion layer absorbs laser light from the plurality of solid light sources and is longer than the wavelength of the laser light A lamp unit that emits wavelength-converted light of a wavelength, and scatters each of the laser beams to emit scattered light;
A cylindrical support column provided with an internal space for storing the power supply unit, the electrical wiring unit, the plurality of light paths, and the lamp unit in the internal space;
Comprising
The plurality of optical paths are solid-state lighting devices having a length with a transmission loss of 30% or less at the wavelength of the laser light. A plurality of solid-state light source units that emit laser light having a wavelength of blue-violet to red light;
A plurality of optical paths for propagating the laser light introduced to the incident end and emitting from the exit end;
A power supply;
An electrical wiring section connecting the power supply section and the plurality of solid state light source sections;
A lamp unit comprising: a heat sink; and a light scattering layer disposed on the heat sink, the light scattering material being dispersed and arranged to scatter laser light from the plurality of solid light sources and turn into scattered light;
A cylindrical support column provided with an internal space for storing the power supply unit, the electrical wiring unit, the plurality of light paths, and the lamp unit in the internal space;
Comprising
The plurality of optical paths are solid-state lighting devices having a length with a transmission loss of 30% or less at the wavelength of the laser light. The cylindrical support column includes metal,
The inner wall of the cylindrical column portion facing the inner space includes a flat portion,
The solid-state lighting device according to claim 1, wherein the plurality of solid-state light source units are distributed and arranged on the flat portion of the inner wall.   The solid-state lighting device according to claim 1, wherein the plurality of optical paths are quartz optical fibers.   The solid-state lighting device according to any one of claims 1 to 4, wherein a radiating fin is provided on an outer edge of the cylindrical column portion that is opposite to the inner wall that is the flat portion.

Images