JP2016028371A - Solid lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid lighting device which controls chromaticity or a color temperature of illumination light.SOLUTION: A solid lighting device includes: a light source part; a light conversion layer; a direction conversion part; an energy conversion element; and a function element. The light source part has solid light-emitting elements. The light conversion layer includes a wavelength conversion material, which absorbs light beams from the solid light-emitting elements and converts the light beams into wavelength conversion light, and has two regions which emit illumination light having different emission spectrums. The direction conversion part includes: an incident part into which the light beams are introduced; and a radiation part which radiates the light beams to the light conversion layer. The energy conversion element converts light or heat into electricity. The function element changes radiation directions of the light beams from the direction conversion part between the first region and the second region by using electric energy generated by the energy conversion element.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a solid-state lighting device.

  When a lighting device is configured using a solid light emitting element such as a light emitting diode (LED) instead of a halogen lamp, a long life can be obtained.

  In such a solid-state lighting device (SSL: Solid-State Lighting), emitted light in a wavelength range of blue-violet to blue and wavelength-converted light emitted from a wavelength conversion material such as a phosphor using a part of the emitted light. And can be mixed to obtain illumination light.

  When an LED is used as the solid state light emitting device, it is necessary to reduce the current density and the thermal resistance in order to reduce the influence of heat generation and droop. That is, the LED chips are often increased in area and arranged in an array.

  If the emitted light is guided to the light emitting part using an optical fiber or the like and separated from the solid light emitting element, heat generation of the light emitting part including the wavelength conversion layer is reduced and electrical connection becomes unnecessary. However, unless electrical connection is made, it becomes difficult to control the chromaticity and light distribution characteristics of the illumination light.

International Publication No. 2007/099827

  Provided is a solid-state lighting device capable of controlling chromaticity or color temperature of illumination light without connecting a lamp unit to a power source.

  The solid-state lighting device according to the embodiment includes a light source unit, a light conversion layer, a direction conversion unit, an energy conversion element, and a functional element. The light source unit includes a solid light emitting element. The light conversion layer includes a wavelength conversion material that absorbs a light beam from the solid-state light emitting element and converts it into wavelength converted light, and has two regions that emit illumination light having different emission spectra. The direction conversion unit includes an incident unit into which the light beam is introduced and an irradiation unit that irradiates the light beam toward the light conversion layer. The energy conversion element converts light or heat into electricity. The functional element uses the electrical energy generated by the energy conversion element to change the irradiation direction of the light beam from the direction changing unit between the first region and the second region.

  Provided is a solid state lighting device capable of controlling the chromaticity or color temperature of illumination light without connecting the lamp unit to a power source.

FIG. 1A is a schematic perspective view of the solid-state lighting device according to the first embodiment, and FIG. 1B is a schematic cross-sectional view along AA. 2A is a schematic perspective view for explaining the action of the functional element in the OFF state, FIG. 2B is a schematic cross-sectional view along the line AA, and FIG. 2C is the action of the functional element in the on state. FIG. 2D is a schematic cross-sectional view taken along line AA. FIG. 3A is a schematic perspective view of a solid-state lighting device according to the second embodiment, and FIG. 3B is a schematic cross-sectional view taken along the line AA. 4A is a schematic perspective view for explaining the operation of the second embodiment, FIG. 4B is a schematic perspective view of the irradiation state of the first region, and FIG. 4C is a irradiation state of the second region. FIG. 4D is a schematic perspective view of the irradiation state of the third region. It is a model perspective view of 3rd Embodiment. FIG. 6A is a schematic cross-sectional view illustrating the operation in the first state of the solid state lighting device of the third embodiment, and FIG. 6B is a schematic cross-sectional view illustrating the operation in the second state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1A is a schematic perspective view of the solid-state lighting device according to the first embodiment, and FIG. 1B is a schematic cross-sectional view along AA.
The solid state lighting device includes a light source unit 10, a light conversion layer 30, a direction conversion unit 22, an energy conversion element 60, and a functional element 70.

  The light source unit (light engine) 10 includes a solid light emitting element. The solid state light emitting device 12 may be a light emitting diode (LED) or a laser diode (LD). When the light beam G1 from the light source unit 10 is guided using the optical fiber bundle 100 or the like, the heat generated in the light source unit 10 is not conducted to the light conversion layer 30. For this reason, a temperature rise can be suppressed in the vicinity of the light conversion layer 30.

  In addition, it is more preferable that the solid-state light emitting element is an LD because the light spread angle can be narrowed to 40 degrees × 25 degrees or the like, so that the efficiency of incidence on the optical fiber bundle 100 can be increased. The length of the optical fiber bundle 100 may be as short as several meters.

  The light source unit 10 may further include drive circuits 13 and 16 and a heat sink (not shown). In this figure, the solid state light emitting device 12 has an LD with an optical output of 1 W or the like and the number thereof is 20. The number of LDs is not limited to 20. In this case, it is necessary to determine the size of the heat sink according to the power consumption of the LD.

  The light source unit 10 further includes a solid state light emitting element 15 that emits light IR used for controlling a signal for driving the functional element 70. The emission wavelength of the light IR used for signal control may be the same as the emission wavelength of the illumination light, but can be infrared light (emission wavelength range of 700 to 1000 nm) that does not affect the illumination. The output of the light IR for signal control may be small.

  Note that if a lens L1 or the like is provided between one end of the optical fiber bundle 100 and the solid light emitting element 12 to collect the light beam, the incident efficiency to the optical fiber bundle 100 can be further increased. When the number of LDs is 20, the optical fiber bundle 100 can include optical fibers 101 to 120 as respective light guide paths. Each optical fiber can be a plastic optical fiber or the like. Note that the emission wavelength of the solid-state light emitting element 12 used for the illumination light GT is in the range of blue-violet (405 nm) to red light (700 nm).

  The light conversion layer 30 has a light diffusing agent that diffuses the light beam from the solid state light emitting element 12 and converts it into scattered light, or a wavelength conversion material that absorbs the light beam and converts it into wavelength converted light. The light conversion layer 30 includes a plurality of divided regions, and the illumination light emitted from each region has a different emission spectrum.

  In the light diffusing layer, light diffusing particles containing a material having a high diffusion transmittance are arranged dispersed in a resin layer or the like. For this reason, scattering by particles increases and coherence can be reduced. The light scattering particles can be polymethyl methacrylate or calcium carbonate.

  In addition, when the wavelength conversion material absorbs the light beam G1 that is blue-violet light (emission wavelength: 405 nm) to blue light (emission wavelength: 490 nm) from the solid light emitting element 12 and emits wavelength conversion light, a light conversion layer. Reference numeral 30 can be a wavelength conversion layer containing a green YAG (Yttrium-Aluminum-Garnet) phosphor, a yellow YAG phosphor, a red YAG phosphor, and the like.

  Moreover, the solid-state lighting device can have the heat conduction part 50 which consists of a metal and ceramics which have high heat conductivity. The first surface 50a of the heat conducting unit 50 is provided with, for example, a recess 50b. The recess 50b has an inner wall 50c that recedes from the first surface 50a and whose cross-sectional width becomes narrower in the depth direction. Further, a through hole 50d continuous with the recess 50b is further provided around the central axis 50e of the recess 50b.

  In FIG. 1B, the heat conducting unit 50, the concave reflection layer 40 provided on the inner wall 50 c and the light conversion layer 30 provided on the concave reflection layer 40 constitute the lamp unit 20. The upper end of the recess 50b can have a diameter of approximately 8 mm.

  Moreover, the solid-state lighting device can have a diffusion plate 45 so as to cover the recess 50b. The diffusing plate 45 can contain a light diffusing agent or the like, and can make a uniform light emitting surface without making a subtle difference in position in the lamp unit 20 having different color temperatures inconspicuous. In addition, the diffusion plate 45 can include a green wavelength conversion layer and the like.

  The direction changing part 22 is provided so as to penetrate the through-hole 50d, and one end becomes an incident part of the light beam and the other end becomes an irradiation part 22a. When the other end is obliquely polished, the light conversion layer 30 can be irradiated, for example, by changing the emission direction by 90 degrees in the vertical plane while maintaining the narrow spread angle of the guided light beam G1. Moreover, it is preferable that an irradiation direction can change 360 degree | times within a horizontal surface. The direction conversion unit 22 is set to a size that fits in a cylinder with an outer diameter of 2 mm.

  Further, when the concave reflection layer 40 is made of a metal having high thermal conductivity, heat generated by wavelength conversion loss in the wavelength conversion layer can be released to the outside through the heat conduction unit 50 while maintaining the light reflectance at 90% or more. It becomes easy.

  In the first embodiment, the energy conversion element 60 is a photoelectric conversion element such as the solar cell 60a. The solar cell 60a is composed of semiconductor pn junctions arranged in an array, and generates photovoltaic power by light irradiation.

  When the electric energy generated by the photovoltaic power of the solar cell 60a is used for driving the functional element 70, the optical signal IR is transmitted to the switch element 91 via the optical fiber 121 for driving signal. When a current flows through the photodiode 80 arranged at the far end opening of the optical fiber 121, it becomes an input signal to a TIA (Trans-Impedance Amplifier) 90. For example, the switch element 91 is turned on using the output signal Vout of the TIA 90 as a trigger, and the photovoltaic power of the solar cell 60 a is supplied to the functional element 70. Note that the electrical energy generated by the photovoltaic power can be stored in the storage battery 93 or the like.

  As a result, the functional element 70 can be driven, and the chromaticity and color temperature of the illumination light GT emitted from the lamp unit 20 can be changed. The functional element 70 can be, for example, an electro-mechanical element such as a piezoelectric element 70a.

  The energy conversion element 60 is not provided with the light conversion layer 30 inside the concave portion 50b and the through hole 50d of the lamp unit 20, and is always irradiated with a part of the scattered light of the light beam G1 and a part of the illumination light. It is good to provide in the area. In particular, it is preferable to provide in a region irradiated with useless light that is not easily reflected by the concave reflective layer 40 and does not contribute to light extraction efficiency. That is, as shown in FIG. 1B, it is preferably provided on the inner wall of the through hole 50d. Inside the through hole 50d, a space for moving the direction changing portion 22 is required. In other words, stray light returning to the through hole 50d through this space or the direction changing portion 22 itself may be used.

  When the light conversion layer 30 is made of a phosphor, the phosphor provided on the surface of the concave reflection layer 40 may be a mixture of a plurality of phosphors having different emission spectrum peak wavelengths. For example, in FIG. 1, the first region 31 of the light conversion layer 30 includes a first wavelength conversion material (for example, a green phosphor) and a second wavelength conversion material (for example, a red phosphor) at a first mixing ratio. Including. In addition, the second region 32 of the light conversion layer 30 includes a second wavelength conversion material (for example, a green phosphor) and a second wavelength conversion material (for example, a red phosphor) that are different from the first mixing ratio. It is included in the mixing ratio. In addition, the third region 33 of the light conversion layer 30 includes a first wavelength conversion material (for example, a green phosphor) and a second wavelength conversion material (for example, a red phosphor) in a first mixing ratio and a second mixing ratio. A third mixing ratio different from the ratio is included. The first region 31 is provided on the first surface 50a side, and the third region is provided on the through hole 50d side.

  The first to third regions 31, 32, and 33 of such a wavelength conversion layer can be provided concentrically. Further, for example, in FIG. 1A, the color temperature may be continuously changed so that the color temperature is high on the side close to the through-hole 50d and the color temperature is lowered as the distance increases. When the irradiation position of the light beam G1 is changed along the central axis 50e, the chromaticity of the illumination light GT, which is a combination of the wavelength converted light and the blue scattered light, can be tuned (changed).

2A is a schematic perspective view for explaining the action of the functional element in the OFF state, FIG. 2B is a schematic cross-sectional view along the line AA, and FIG. 2C is the action of the functional element in the on state. FIG. 2D is a schematic cross-sectional view taken along line AA.
The direction changing portion 22 is provided so as to penetrate the through hole 50d. The irradiation unit 22a of the direction conversion unit 22 includes an oblique polishing surface, and the light beam G1 irradiates the light conversion layer 30 after being reflected by the polishing surface. In the OFF state of the functional element 70, bluish illumination light having a high color temperature is emitted. If the color temperature of the illumination light GT is lowered, as shown in FIGS. 2C and 2D, the photovoltaic power of the solar cell 60a is applied to the piezoelectric element 70a, the functional element 70 is turned on, and the direction The irradiation unit 22a of the conversion unit 22 is moved upward. As a result, illumination light GT having a low color temperature can be obtained. 2A and 2C show a state before the diffusion plate 45 is provided.

  Further, speckle noise can be reduced by minutely vibrating the direction changing section 22 using the piezoelectric element 70a. For this reason, the coherence property of the illumination light GT can be reduced, and the safety of the illumination light GT can be increased. As the piezoelectric material, quartz, berlinite, tourmaline, or the like can be used.

  In the first embodiment, it is possible to control the chromaticity, color temperature, and the like of the illumination light GT by driving the functional element 70 only by an optical transmission system without supplying electric energy to the lamp unit 20 by electric wiring.

FIG. 3A is a schematic perspective view of the solid-state lighting device according to the second embodiment, and FIG. 3B is a schematic “cross-sectional view taken along line AA”.
In the second embodiment, the light conversion layer 30 which is a wavelength conversion layer includes a first region 34 and a second region which are fan-divided into different positions around the central axis 50e of the inclined recess 50b of the heat conducting unit 50. 35 and a third region 36.

  The first region 34 of the wavelength conversion layer includes a first wavelength conversion material (for example, a green phosphor) and a second wavelength conversion material (for example, a red phosphor) at a first mixing ratio. In addition, the second region 35 of the wavelength conversion layer includes a second wavelength conversion material (for example, a green phosphor) and a second wavelength conversion material (for example, a red phosphor) that are different from the first mixing ratio. Include in mixing ratio. Further, the third region 36 of the wavelength conversion layer includes a first wavelength conversion material (for example, a green phosphor) and a second wavelength conversion material (for example, a red phosphor) that are mixed in a first mixing ratio and a second mixing ratio. In a third mixing ratio different from

  The first region 34 to the third region 36 of the wavelength conversion layer can be arranged in a fan shape around the central axis 50e of the recess 50b. The first to third regions 34, 35, and 36 can absorb the irradiated light beam G1 and emit wavelength converted light and scattered light converted from the light beam without being absorbed by the wavelength conversion layer. As a result, illumination light having different chromaticity and color temperature can be emitted from each region. 3A and 3B, the first to third regions 34, 35, and 36 are provided as a pair of positions that are substantially symmetrical with respect to the central axis 50e, but the present invention is not limited to this.

4A is a schematic perspective view for explaining the operation of the second embodiment, FIG. 4B is a schematic perspective view of the irradiation state of the first region, and FIG. 4C is a irradiation state of the second region. FIG. 4D is a schematic perspective view of the irradiation state of the third region.
As shown in FIG. 4A, the direction changing portion 22 disposed in the through hole 50d is rotatable around the central axis 50e of the recess 50b. That is, the functional element 70 has a rotation mechanism such as a motor, and can rotate the direction changing unit 22 at a predetermined angle around the central axis 50e.

  As illustrated in FIG. 4B, the emission unit 22 a of the direction conversion unit 22 emits the light beam G <b> 1 toward the first region 34 of the wavelength conversion layer and corresponds to the composition of the wavelength conversion layer in the first region 34. The illumination light GT in which the wavelength-converted light and the blue scattered light multiple-reflected by the wavelength conversion layer are mixed is emitted.

  When the chromaticity or color temperature of the illumination light GT is not in the desired range, for example, as shown in FIG. 4C, the direction changing unit 22 is rotated to irradiate the second region 35 with the light beam G1. . When the chromaticity and color temperature of the illumination light GT are not in the desired ranges, the direction changing unit 22 is further rotated and the light beam G1 is emitted toward the third region 36 as shown in FIG. Thus, the chromaticity and color temperature of the illumination light GT can be controlled without directly connecting the power source and the lamp unit 20 directly.

FIG. 5 is a schematic perspective view of the third embodiment.
The light conversion layer 30 can be a first region 37 containing a light diffusing agent, a second region 38 containing a red wavelength conversion material, and a third region 39 containing a green wavelength conversion material. When the blue LD light beam is irradiated toward the first region 37, the blue scattered light by the light scattering agent can be emitted as monochromatic illumination light GT. When the blue LD light beam is irradiated toward the second region 38, the red wavelength converted light can be emitted as the monochromatic illumination light GT. In addition, when the blue LD light beam is irradiated toward the third region 39, monochromatic green wavelength converted light can be emitted as illumination light GT. Thus, the emission spectra of the emitted light from the first to third regions 37, 38, 39 are different.

  Further, for example, the light conversion layer 30 can be a second region 38 and a third region 39 containing a yellow wavelength conversion material. If the yellow light intensity in the second region 38 and the yellow light intensity in the third region 39 are made different by changing the content of the yellow phosphor, etc., white light with different chromaticities can be obtained. The light conversion layer 30 may contain a light scattering agent together with a yellow wavelength conversion material.

FIG. 6A is a schematic cross-sectional view illustrating the operation in the first state of the solid state lighting device of the third embodiment, and FIG. 6B is a schematic cross-sectional view illustrating the operation in the second state.
In the third embodiment, the energy conversion element 60 is a Seebeck effect element 60b. The Seebeck effect is an effect in which a voltage is generated when a temperature difference is provided between different metals or semiconductors. The Seebeck effect and the Peltier effect are reversible. The Seebeck effect element 60b is provided between the wavelength conversion layer and the inner wall 50c of the heat conducting unit 50, for example. One surface of the Seebeck effect element 60b is in contact with the wavelength conversion layer (high temperature side), and the other surface is in contact with the inner wall (low temperature side) 50c of the heat conducting unit 50. The functional element 70 can be mechanically driven by the electromotive force generated by the temperature.

  Moreover, the functional element 70 shall be the micro MEMS (Micro Electro Mechanical Systems) mirror 71 which can change a reflection angle, for example. When the angle of the micromirror in the second state is changed so as to be larger than the incident angle in the first state of FIG. 6A, the reflected light beam is above the irradiation position of the wavelength conversion layer in the first state. Can be irradiated. For this reason, the chromaticity and color temperature of the illumination light GT can be controlled. Since the size of the MEMS 71 is small, power consumption may be small and light energy may be small.

  Further, the functional element 70 is not limited to one that performs rotational movement or linear movement. For example, an optical switch that changes the irradiation position by changing the optical path may be used.

  According to the solid state lighting devices of the first to third embodiments, the chromaticity and color temperature of the illumination light GT can be controlled without connecting the lamp unit 20 to a power source. Moreover, since the lamp part 20 does not have a solid light emitting element, it becomes easy to reduce the size and weight.

  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.

DESCRIPTION OF SYMBOLS 10 Light source part, 12, 15 Solid light emitting element, 20 Lamp part, 22 Direction conversion part, 22a Irradiation part, 30 Light conversion layer, 40 Concave reflection layer, 50 Thermal conduction part, 50a 1st surface, 50b Concave part, 50c Inner wall , 50d through-hole, 50e central axis, 60 energy conversion element, 60a solar cell, 60b Seebeck effect element, 70 functional element, 100 optical fiber bundle, 121 optical fiber, 93 storage battery, G1 light beam, GT illumination light

Claims (9)

A light source unit having a solid state light emitting device;
A light conversion layer that includes a wavelength conversion material that absorbs a light beam from the solid-state light emitting element and converts the light into wavelength converted light, and has two regions that emit illumination light having different emission spectra;
A direction changing portion having an incident portion into which the light beam is introduced and an irradiation portion that irradiates the light beam toward the light conversion layer;
An energy conversion element that converts light or heat into electricity;
A functional element that changes the irradiation direction from the direction changing portion between the first region and the second region using electrical energy generated by the energy conversion device;
A solid state lighting device. The first region of the light conversion layer includes a first wavelength conversion material and a second wavelength conversion material at a first mixing ratio, and is not absorbed by the first wavelength conversion light and the first region. Emits scattered light converted from the light beam,
The second region of the light conversion layer includes the first wavelength conversion material and the second wavelength conversion material at a second mixing ratio different from the first mixing ratio, and the second wavelength conversion light and Emitting scattered light converted from the light beam without being absorbed by the second region;
The solid-state lighting device according to claim 1, wherein a chromaticity or a color temperature of the illumination light can be changed. The first region of the light conversion layer includes a first wavelength conversion material, and emits the first wavelength converted light and scattered light converted from the light beam without being absorbed by the first region,
The second region of the light conversion layer includes the first wavelength conversion material, and absorbs the second wavelength converted light having a light output different from the light output of the first wavelength converted light and the second region. And the scattered light converted from the light beam without being emitted,
The solid-state lighting device according to claim 1, wherein a chromaticity or a color temperature of the illumination light can be changed. The first region of the light conversion layer includes a first wavelength conversion material, and emits first wavelength conversion light and scattered light converted from the light beam without being absorbed by the first wavelength conversion material. And
The second region of the light conversion layer has a light diffusing agent, emits scattered light converted from the light beam,
The solid-state lighting device according to claim 1, wherein the chromaticity of the illumination light can be changed. A first surface, a recess recessed from the first surface, and a heat conduction portion having a through hole that is continuous with the bottom of the recess and penetrates the heat conduction portion;
A concave reflection layer provided between the inner wall of the recess and the light conversion layer;
Further comprising
The solid state lighting device according to any one of claims 1 to 4, wherein the direction changing portion passes through the through hole.   The solid state lighting device according to claim 5, wherein the light conversion layer has the first region on the first surface side and the second region on the bottom side.   The solid state lighting device according to claim 5, wherein the light conversion layer has the first region and the second region at different positions around a central axis of the recess.   The said energy conversion element is a Seebeck effect element provided between the solar cell provided in the inner wall of the said through-hole, or the said concave-surface reflection layer and the said heat conduction part. The solid-state lighting device described in 1.   The solid state lighting device according to claim 1, wherein the functional element includes any one of a piezoelectric element, a MEMS mirror, and an optical switch.

Images