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Diffuser and lighting device

A lighting device and diffuser technology, which is applied to lighting devices, lighting device parts, lighting and heating equipment, etc., can solve the problem of thick lighting system thickness and other issues

Pending Publication Date: 2022-01-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this lighting system, on the upper side (such as the back surface) of the diffused light generating body (also called "diffuser") constituted by dispersing nanoparticles that generate diffused light (such as Rayleigh scattered light) in the base material Side) is equipped with a light source, therefore, the thickness of the lighting system is thick

Method used

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  • Diffuser and lighting device
  • Diffuser and lighting device
  • Diffuser and lighting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0043] 《1-1》Summary of Embodiment 1

[0044] figure 1 It is a cross-sectional view schematically showing the configuration of the lighting device 100 according to the first embodiment. figure 2 It is a top view schematically showing the structure of the lighting device 100 . Such as figure 1 and figure 2 As shown, the lighting device 100 has a light source 10 and a diffuser 20 . The illuminating device 100 employs an edge-incidence system in which the light source 10 is arranged to face the light-incident surface 21 , which is a side surface located at an end of the diffuser 20 . The diffuser 20 has a light incident surface 21 , a light guide diffusion portion 22 , and a light exit surface (in this example, a front surface 23 and a rear surface 24 ). In this example, the front surface 23 is the main light emitting surface.

[0045] Light emitted from the light source 10 is incident on the light incident surface 21 as incident light Li. The light guide diffusion part 2...

Embodiment approach 2

[0170] Figure 11 It is a cross-sectional view schematically showing the structure of the lighting device 110 according to the second embodiment. exist Figure 11 in, for Figure 8 The structural elements shown are the same as or corresponding to the structural elements, marked with Figure 8 The numbers shown are the same as those shown. The lighting device 110 of Embodiment 2 is different from the lighting device 100 of Embodiment 1 in that it has a back surface light source 30 and a back surface plate 40 . Except for this point, the lighting device 110 of the second embodiment is the same as the lighting device 100 of the first embodiment.

[0171] The back surface light source 30 is arranged on the back surface 24 side of the diffuser 20 , and emits light Lb toward the back surface plate 40 . For example, the back surface light source 30 may have a plurality of light emitting elements whose optical axis direction is substantially perpendicular to the light emitting su...

example 1

[0179] Hereinafter, an example of the diffuser 20 according to the first embodiment will be described using specific numerical values. The diffuser 20 of Example 1 is a plate-shaped diffuser with a square main surface, and the length of one side is 600 mm (therefore, the length Z d =600mm), thickness Y d = 5mm diffuser. In addition, the refractive index of the substrate (substrate 27 ) of the diffuser 20 is 1.49, the refractive index of the particles is 1.43, and the particle diameter is 100 nm.

[0180] The diffuser 20 of Example 1 has a single-side incident structure in which the light incident surface 21 is provided only at one end portion (one side surface) of a square main surface constituting the diffuser 20 .

[0181] exist Figure 13 (a) and (b) show the light utilization efficiency OE, Simulation results of color change Δu'v' and illuminance change V / P. Figure 13 (a) and (b) are graphs showing the relationship between α of the diffuser 20 of Example 1 and light ...

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Abstract

A diffuser (20) has a light incident surface (21); a light guide / diffusion unit (22) that guides incident light (Li) and generates scattered light (Ls) by scattering the incident light (Li) by the nanoparticles (26); and a light emission surface (23) in which the correlated color temperature of the scattered light is higher than the correlated color temperature of the incident light, wherein when N represents the number of nanoparticles contained in the light guide diffusion section per unit volume, A represents the average particle radius of the nanoparticles, Qs represents the scattering efficiency determined by the combination of the nanoparticles and the medium of the light guide diffusion section, and MFP represents an average free stroke with respect to light having a design wavelength set in the range of 450-650 nm, Zd represents a length of the light guide diffusion section in a light guide direction of incident light, and alpha represents a coefficient, MFP = 1 / ([pi]*A2 *Qs *N) = [alpha] Zd and 0.4 <= [alpha] <= 5 are satisfied.

Description

technical field [0001] The present disclosure relates to diffusers and lighting devices. Background technique [0002] For example, Patent Document 1 proposes a lighting system that simulates a blue sky. In this lighting system, on the upper side (such as the back surface) of the diffused light generating body (also called "diffuser") constituted by dispersing nanoparticles that generate diffused light (such as Rayleigh scattered light) in the base material side) is equipped with a light source, therefore, the thickness of the lighting system is relatively thick. In order to reduce the thickness, it is preferable to employ an edge-incidence method (also referred to as an "edge emission method") in which a light source is arranged to face a side surface that is an end portion of a plate-shaped diffuser. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2015-207554 Contents of the invention [0006] The pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00G02B5/02F21V8/00F21Y105/00F21Y113/13F21Y115/10
CPCF21V9/02F21Y2115/10F21Y2103/10G02B5/0242G02B5/0278G02B6/0041G02B5/02
Inventor 藤井佑辅冈垣觉
Owner MITSUBISHI ELECTRIC CORP