CN204573617U - Lighting device - Google Patents

Lighting device Download PDF

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Publication number
CN204573617U
CN204573617U CN201390000713.7U CN201390000713U CN204573617U CN 204573617 U CN204573617 U CN 204573617U CN 201390000713 U CN201390000713 U CN 201390000713U CN 204573617 U CN204573617 U CN 204573617U
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CN
China
Prior art keywords
light
mentioned
light scattering
face
scattering sites
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201390000713.7U
Other languages
Chinese (zh)
Inventor
小谷直树
谷村一郎
中川有士
太田明子
村中泰一
村濑龙马
角陆晋二
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Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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Filing date
Publication date
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Application granted granted Critical
Publication of CN204573617U publication Critical patent/CN204573617U/en
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F21V7/0016—Reflectors for light sources providing for indirect lighting on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/30—Elongate light sources, e.g. fluorescent tubes curved
    • F21Y2103/33—Elongate light sources, e.g. fluorescent tubes curved annular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The utility model provides a kind of lighting device.Wherein, light guide plate possesses annulus and ring inside portion, above-mentioned annulus possesses the opposed part of element line and inner reflection part, said elements arranges opposed part and has the plane of incidence, above-mentioned inner reflection part is positioned to arrange the part of opposed part by side, above-mentioned ring inside portion than said elements, there is the reflecting surface making to reflect from the light of above-mentioned plane of incidence incidence towards above-mentioned ring inside portion, above-mentioned reflecting surface possesses the 1st light scattering sites of the ring-type being implemented light scattering process, and the 2nd light scattering sites, above-mentioned 2nd light scattering sites is than the region of above-mentioned 1st light scattering sites by side, above-mentioned ring inside portion, be implemented the light scattering process of the form different from above-mentioned 1st light scattering sites, to make to penetrate more light than above-mentioned 1st light scattering sites.

Description

Lighting device
Technical field
The utility model relates to the lighting device possessing the light-emitting components such as LED (Light Emitting Diode) as light source, is particularly employing the technology of carrying out in the lighting device of face luminescence, brightness disproportionation being alleviated of light guide plate.
Background technology
As the example of carrying out the lighting device of face luminescence employing light guide plate, there is the lighting device 800 of edge-light (edge light) mode as shown in Figure 20.In this lighting device 800, in the periphery of light guide plate 840, multiple light-emitting component 822 is configured to ring-type to make respective main injection direction towards the state of light guide plate 840.The light penetrated from light-emitting component 822 incides in light guide plate 840 from the outer peripheral face of light guide plate 840 and plane of incidence 840c, penetrates equably from the face of the face side of light guide plate 840 and light emergence face 840a.In the outer peripheral edge of above-mentioned light guide plate 840, frame material 870 is installed to be hidden by light-emitting component 822, by this frame material 870, the raising (patent document 1) of the protection of light-emitting component 822 and the aesthetic appearance of lighting device 800 can be realized.
But if at the outer peripheral edge installing frame material 870 of light guide plate 840, then the light penetrated from the outer peripheral edge of light guide plate 840 is blocked by frame material 870, is therefore difficult to make the face side of lighting device 800 realize whole luminescence.
As other examples of carrying out the lighting device of face luminescence employing light guide plate, just like the lighting device 900 of directly-below type mode as shown in Figure 21.In this lighting device 900, in the rear side of light guide plate 940, multiple light-emitting component 922 is arranged as ring-type to make the main injection direction of respective light-emitting component 922 towards the state of light guide plate 940.The plane of incidence 944b formed from the rear side of the annulus 941 at light guide plate 940 from the light of light-emitting component 922 injection incides in annulus 941, reflected by the face of the face side of annulus 941 and reflecting surface 941a, and in the ring inside portion 942 being directed into light guide plate 940 and ring outside portion 943.Further, penetrate equably from the face of the face side of ring inside portion 942 and ring outside portion 943 and light emergence face 942a, 943a.
If light-emitting component 922 to be configured in the rear side of light guide plate 940 as lighting device 900, then do not need the outer peripheral edge installing frame material at light guide plate 940, the light penetrated from the outer peripheral edge of light guide plate 940 can not be blocked by frame material, therefore, it is possible to make the face side of lighting device 900 realize whole luminescence.
Prior art document
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2012-84316 publication
Patent document 2: Japanese Unexamined Patent Publication 2012-104476 publication
Utility model content
The problem that utility model will solve
But in the structure that lighting device 900 is such, produce light hardly by the territory, shadow zone penetrated at the reflecting surface 941a of the annulus 941 of light guide plate 940, therefore this territory, shadow zone becomes the reason of the brightness disproportionation of lighting device 900.Specifically, the reflecting surface 941a of annulus 941 is in order to effectively be directed to ring inside portion 942 and ring outside portion 943 and be formed as making the wide total reflection that causes by light, except side exists except the region of light-emitting component 922 overleaf, light penetrates from this reflecting surface 941a to face side hardly.Therefore, become territory, shadow zone beyond the region that there is light-emitting component 922 in reflecting surface 941a, produce brightness disproportionation due to this territory, shadow zone.
The utility model, in view of above-mentioned problem, its object is to provide whole the luminescence that can realize face side and the less lighting device of brightness disproportionation.
For solving the means of problem
In order to reach above-mentioned purpose, the lighting device of a technical scheme of the present utility model, in the rear side of light guide plate, multiple light-emitting component is configured to ring-type with respective main injection direction towards the state of above-mentioned light guide plate, the feature of this lighting device is, above-mentioned light guide plate possesses the annulus being formed as ring-type along the element line be made up of above-mentioned multiple light-emitting component and the ring inside portion formed in above-mentioned annulus continuously inside the ring of above-mentioned annulus; Above-mentioned annulus possesses the opposed part of element line and inner reflection part, it is arrange opposed part with said elements that said elements arranges opposed part, there is the plane of incidence that the light that penetrates from above-mentioned light-emitting component is incident, above-mentioned inner reflection part is positioned to arrange the part of opposed part by side, above-mentioned ring inside portion than said elements, has the reflecting surface making to reflect from the light of above-mentioned plane of incidence incidence towards above-mentioned ring inside portion; Above-mentioned reflecting surface possesses the 1st light scattering sites and the 2nd light scattering sites, above-mentioned 1st light scattering sites in the form of a ring, being arranged opposed part along said elements implements light scattering process, above-mentioned 2nd light scattering sites is than the region of above-mentioned 1st light scattering sites by side, above-mentioned ring inside portion, be implemented the light scattering process of the form different from above-mentioned 1st light scattering sites, to make to penetrate more light than above-mentioned 1st light scattering sites.
Utility model effect
The lighting device of a technical scheme of the present utility model, is equipped with multiple light-emitting component in the rear side of light guide plate with cyclic ligand.Thus, do not need to hide multiple light-emitting component and at the peripheral part installing frame material of light guide plate, the light that the outer peripheral edge from light guide plate is penetrated can not being blocked, therefore, it is possible to make face side whole luminescence because of frame material.
In addition, the lighting device of a technical scheme of the present utility model, owing to implementing light scattering process to the reflecting surface of reflecting part, therefore not easily produces territory, shadow zone at annulus.And, the 1st light scattering sites that reflecting surface due to reflecting part possesses the ring-type being implemented light scattering process and be implemented the form different from above-mentioned 1st light scattering sites light scattering process to make to penetrate than above-mentioned 1st light scattering sites the 2nd light scattering sites of more light, therefore not easily produce in reflecting part and part that light-emitting component is near and and light-emitting component part far away between luminance difference.Thus, brightness disproportionation can be alleviated compared with lighting device in the past.
Accompanying drawing explanation
Fig. 1 is the figure that the mode of installing the lighting device of the first embodiment to ceiling is described.
Fig. 2 is the stereogram of the lighting device representing the first embodiment.
Fig. 3 is the exploded perspective view of the lighting device representing the first embodiment.
Fig. 4 is the profile of the lighting device representing the first embodiment.
Fig. 5 is the amplification profile of the part that the double dot dash line shown in Fig. 4 is surrounded.
Fig. 6 is the plane of the reflection part representing the first embodiment, and (a) is the figure observed from face side, and (b) is the figure observed from rear side.
Fig. 7 is the plane of the light guide plate representing the first embodiment, and (a) is the figure observed from face side, and (b) is the figure observed from rear side.
Fig. 8 A is the figure of the brightness disproportionation produced for illustration of lighting device in the past.
Fig. 8 B is the figure of the brightness disproportionation produced for illustration of lighting device in the past.
Fig. 9 is the schematic diagram of the brightness disproportionation produced for illustration of lighting device in the past.
Figure 10 is the schematic diagram for illustration of the route by the light after the element mounting face reflection of substrate.
Figure 11 is the schematic diagram alleviating effect for illustration of the brightness disproportionation of reflection part.
Figure 12 is the schematic diagram for illustration of the route being directly incident on the light in light guide plate from light-emitting component.
Figure 13 is the schematic diagram alleviating effect for illustration of the brightness disproportionation of light guide plate.
Figure 14 A is the figure that the brightness disproportionation brought for illustration of the combination of light guide plate and reflection part alleviates effect.
Figure 14 B is the figure that the brightness disproportionation brought for illustration of the combination of light guide plate and reflection part alleviates effect.
Figure 15 is the schematic diagram that the brightness disproportionation brought for illustration of the combination of light guide plate and reflection part alleviates effect.
Figure 16 is the exploded perspective view of the lighting device representing the second embodiment.
Figure 17 is the profile of the lighting device representing the second embodiment.
Figure 18 is the amplification profile of the part that the double dot dash line shown in Figure 17 is surrounded.
Figure 19 is the profile of light guide plate for illustration of variation and reflection part.
Figure 20 is the plane of the lighting device of the edge-light mode represented in the past.
Figure 21 is the profile of the lighting device of the directly-below type mode represented in the past.
Detailed description of the invention
Hereinafter, with reference to the accompanying drawings of the lighting device of a technical scheme of the present utility model.In addition, the engineer's scale of the parts in each accompanying drawing is different from reality.Further, in this application, the symbol " ~ " used when representing number range comprises the numerical value at its two ends.
< first embodiment >
(overall structure)
Fig. 1 is the figure that the mode of installing the lighting device of the first embodiment to ceiling is described.As shown in Figure 1, the lighting device 1 of a technical scheme of the present utility model be such as imbed ceiling 2 and peace hold shot-light (down light).In addition, lighting device 1 of the present utility model is not limited to lower shot-light, can be the building lighting device beyond the lower shot-lights such as ceiling light (ceiling light), also can be the lighting device beyond the building lighting devices such as back of the body lamp (back light).
Lighting device 1 by a part for housing 10 being embedded into the through hole 2a that is arranged at ceiling 2 and making solid parts 3 frame of the frame of the leaf-spring-like being installed on housing 10 be affixed to the ceiling back side 2b of ceiling 2, thus is installed in ceiling 2.In addition, the solid parts 3 of frame are not limited to the parts of leaf-spring-like.In addition, lighting device 1 is not limited to the method solid based on frame using the solid parts 3 of frame to the installation method of ceiling 2, also can by the installation such as screwing tight, bonding.
At the ceiling back side 2b of ceiling 2, be configured with the circuit unit 4 for making lighting device 1 light, lighting device 1 is electrically connected with circuit unit 4 via power line 23.Circuit unit 4 is electrically connected with outside power frequency AC (not shown), by the electric current supply that inputs from power frequency AC to lighting device 1.In addition, in the present embodiment, circuit unit 4 is needed independent of lighting device 1, but the lighting device of the lighting device of the present utility model circuit unit 4 that can be also built-in.
Fig. 2 is the stereogram of the lighting device representing the first embodiment.Fig. 3 is the exploded perspective view of the lighting device representing the first embodiment.Fig. 4 is the profile of the lighting device representing the first embodiment.Fig. 5 is the amplification profile of the part that the double dot dash line shown in Fig. 4 is surrounded.As shown in Fig. 2 ~ Fig. 5, lighting device 1 such as possesses housing 10, light emitting module 20, reflection part 30, light guide plate 40 and diffusion cover body 50 etc.
(housing)
As shown in Figure 3, housing 10 is plate-likes of such as die casting aluminum, possesses the main part 11 of bottomed cylindrical and the convex edge 12 of the annulus tabular extended in the opening portion of this main part 11.
Main part 11 has the sidewall sections 14 of discoideus bottom parts 13 and the cylindrical shape extended in the outer peripheral edge of bottom parts 13, as shown in Figure 4, is accommodated with a part for light emitting module 20, reflection part 30 and light guide plate 40 in the inside of main part 11.Turning back to Fig. 3, at the sidewall sections 14 of main part 11, being formed with the through hole 15 for making power line 23 insert.
Convex edge 12 has the main part 16 of the annulus tabular abutted with ceiling 2 and the flange portion 17 extended in the outer peripheral edge of this main part 16, as shown in Figure 4, under the state being embedded in flange portion 17 outside the sidewall portion 52 making diffusion cover body 50, housing 10 and diffusion cover body 50 are fixed by such as bonding grade.
(light emitting module)
Return Fig. 3, the substrate 21 that light emitting module 20 has annulus tabular and the multiple light-emitting components 22 be mounted on an interarea of this substrate 21 and element mounting face 21a, and be configured in the rear side of light guide plate 40.Each light-emitting component 22, to make respective main injection direction towards the state of light guide plate 40, the element mounting face 21a of substrate 21 is arranged as circular and is provided with interval between adjacent light-emitting component.
Substrate 21 has the insulating barrier be such as made up of ceramic substrate or thermal conductive resin etc. and this double-decker of metal level be made up of aluminium sheet etc.Be formed with Wiring pattern (not shown) at substrate 21, each light-emitting component 22 is electrically connected with power line 23 via above-mentioned Wiring pattern and connector 24.The element mounting face 21a of substrate 21 becomes for making light efficiently to the reflecting surface of light guide plate 40 lateral reflection.
Light-emitting component 2 is such as LED, uses COB (Chip on Board) technology and faces up and be installed on the element mounting face 21a of substrate 21.In addition, light-emitting component of the present utility model also can be such as LD (laser diode), EL element (electroluminescent cell).In addition, light-emitting component of the present utility model can by the element mounting of SMD (Surface Mount Device, surface mount device) type on substrate.
(reflection part)
Reflection part 30 is made up of the inner reflection parts 30a of circular plate-like shape and the outside reflection part 30b of annulus tabular be configured to the periphery of inner reflection parts 30a surrounds, as shown in Figure 4, this reflection part 30 configures close to light guide plate 40 in the rear side of light guide plate 40.Specifically, inner reflection parts 30a is configured in the rear side of the ring inside portion 42 of light guide plate 40, outside reflection part 30b is configured in the rear side of the ring outside portion 43 of light guide plate 40, overall as reflection part 30, avoids light-emitting component 22 and is configured in the rear side of light guide plate 40.In other words, observe from face (the face 42b of rear side and the face 43b of rear side) the orthogonal direction of the rear side with light guide plate 40, reflection part 30 be configured in not with element accommodating groove (groove portion) 60 region overlapped of the ring-type that the element line of the ring-type be made up of multiple light-emitting component 22 is received.In addition, in the application, the illumination direction side of lighting device 1 is face side, and the opposition side of face side is rear side.In Fig. 2 ~ Fig. 5, being face side on the upside of paper, is rear side on the downside of paper.
The external diameter of outside reflection part 30b is roughly the same with the internal diameter of the main part 11 of housing 10, by means of only outside reflection part 30b being accommodated in the location that can complete outside reflection part 30b in main part 11.As the material of inner reflection parts 30a and outside reflection part 30b, highly reflective polycarbonate resin, high reverse--bias nylon resin, high reverse--bias polybutylene terephthalate (PBT) resin, the material that high reverse--bias Foamex isoreflectance is high are preferred.
As shown in Figure 5, the face of the face side of inner reflection parts 30a is made up of the 1st light reflection surface 31a and the 2nd light reflection surface 32a.1st light reflection surface 31a is opposed with the face 42b of the rear side of the ring inside portion 42 of light guide plate 40, and plays the light reflection making the rearwardly side leakage from ring inside portion 42 and the effect returning to ring inside portion 42.2nd light reflection surface 32a is opposed with the face 46b of the rear side of the 2nd light scattering part 46 of the annulus 41 of light guide plate 40, and performance makes reflect from the 2nd light scattering part 46 light that rearwardly side is leaked and return the effect of the 2nd light scattering part 46.
1st light reflection surface 31a contacts with the 42b face, face of the rear side of ring inside portion 42, and the 2nd light reflection surface 32a contacts with the 46b face, face of the rear side of the 2nd light scattering part 46.Owing to carrying out face contact, so light can be made to return light guide plate 40 efficiently, and the location of inner reflection parts 30a and light guide plate 40 can be carried out with high accuracy.
In addition, lighting device of the present utility model is not necessarily need to carry out face contact, can vacate gap between the face 42b of the rear side of the 1st light reflection surface 31a and ring inside portion 42 yet.In addition, also between the face 46b of the rear side of the 2nd light reflection surface 32a and the 2nd light scattering part 46, also gap can be vacated.
The face of the face side of outside reflection part 30b is made up of the 1st light reflection surface 31b and the 2nd light reflection surface 32b.1st light reflection surface 31b is opposed with the face 43b of the rear side of the ring outside portion 43 of light guide plate 40, and plays the light reflection making the rearwardly side leakage from ring outside portion 43 and the effect returning to ring outside portion 43.2nd light reflection surface 32b is opposed with the face 48b of the rear side of the 4th light scattering part 48 of the annulus 41 of light guide plate 40, and performance makes reflect from the 4th light scattering part 48 light that rearwardly side is leaked and return the effect of the 4th light scattering part 48.
1st light reflection surface 31b contacts with the 43b face, face of the rear side of ring outside portion 43, and the 2nd light reflection surface 32b contacts with the 48b face, face of the rear side of the 4th light scattering part 48.Owing to carrying out face contact, so light can be made to return light guide plate 40 efficiently, and the location of outside reflection part 30b and light guide plate 40 can be carried out with high accuracy.In addition, lighting device of the present utility model is not necessarily need to carry out face contact, can vacate gap between the face 43b of the rear side of the 1st light reflection surface 31b and ring outside portion 43 yet.In addition, also between the face 48b of the rear side of the 2nd light reflection surface 32b and the 4th light scattering part 48, also gap can be vacated.
As shown in Figure 4, inner reflection parts 30a and outside reflection part 30b configures with following state, that is: in the rear side of light guide plate 40, the outer peripheral face 33a of inner reflection parts 30a and the inner peripheral surface 33b of outside reflection part 30b is spaced apart and mutually opposing.Thus, the element accommodating groove 60 to the ring-type that light-emitting component 22 is received is specified by inner reflection parts 30a and outside reflection part 30b.In the rear side of the annulus 41 of light guide plate 40, the part that there is not inner reflection parts 30a and outside reflection part 30b is element accommodating groove 60.
The inside circumference of element accommodating groove 60 is made up of the outer peripheral face 33a of inner reflection parts 30a, and the outside circumference of element accommodating groove 60 is made up of the inner peripheral surface 33b of outside reflection part 30b, and the bottom surface of element accommodating groove 60 is made up of the element mounting face 21a of substrate 21.Further, as shown in Figure 5, the outer peripheral face 33a of inner reflection parts 30a and the element mounting face 21a angulation θ 1 of substrate 21 is acute angles.In addition, the inner peripheral surface 33b of outside reflection part 30b and the element mounting face 21a angulation θ 2 of substrate 21 is also acute angle.Further, the outer peripheral face 33a of inner reflection parts 30a and the inner peripheral surface 33b of outside reflection part 30b becomes light reflection surface respectively.
Fig. 6 is the plane of the reflection part representing the first embodiment, and (a) is the figure observed from face side, and (b) is the figure observed from rear side.In Fig. 6, light-emitting component represents with double dot dash line relative to the allocation position of reflection part.In addition, the center of reflection part 30 represents with symbol O.
As shown in Figure 6, for element accommodating groove 60, with exist light-emitting component 22 position well width (well width at the position corresponding with light-emitting component 22) compared with, the well width (well width at the position corresponding with the gap of adjacent light-emitting component 22) that there is not the position of light-emitting component 22 is wider.Here, the well width of element accommodating groove 60 is the distances between the outer peripheral face 33a of inner reflection parts 30a and the inner peripheral surface 33b of outside reflection part 30b, be reflection part 30 radial direction on distance.
If illustrate in greater detail the well width of element accommodating groove 60, then as shown in Figure 5, the well width of element accommodating groove 60 temporarily broadens from face side towards rear side.And, for element accommodating groove 60, as shown in Fig. 6 (a), in face side opening, the well width W2 that there is not the position of light-emitting component 22 is also wide than the well width W1 at the position that there is light-emitting component 22, as shown in Fig. 6 (b), overleaf in side opening, the well width W4 that there is not the position of light-emitting component 22 is also wide than the well width W3 at the position that there is light-emitting component 22.
(light guide plate)
As shown in Figure 3, light guide plate 40 is circular plate-like shape, be made up of annulus 41, ring inside portion 42 and ring outside portion 43, annulus 41 is formed as circular along the element line be made up of light-emitting component 22, ring inside portion 42 is located to be formed continuously with annulus 41 and is discoideus inside the ring of annulus 41, and ring outside portion 43 is formed continuously in the ring outside of annulus 41 and annulus 41 and is circular.These annulus 41, ring inside portion 42 and ring outside portion 43 these 3 are shaped integratedly.As the material of light guide plate 40, the material that the light conductivities such as acrylic resin, polycarbonate resin, polystyrene resin, glass are good is preferred.
Annulus 41 is made up of the opposed part 44 of element line, the 1st light scattering part 45, the 2nd light scattering part 46, the 3rd light scattering part 47 and the 4th light scattering part 48.The opposed part of element line 44 is opposed circular of the element line that forms with by multiple light-emitting component 22.1st light scattering part 45 be positioned at the opposed part of element line 44 ring inside and circular along the opposed part of element line 44.2nd light scattering part 46 be positioned at the 1st light scattering part 45 ring inside and circular along the 1st light scattering part 45.Inner reflection part is formed by the 1st light scattering part 45 and the 2nd light scattering part 46.3rd light scattering part 47 be positioned at the opposed part of element line 44 ring outside and circular along the opposed part of element line 44.4th light scattering part 48 be positioned at the 3rd light scattering part 47 ring outside and circular along the 3rd light scattering part 47.Reflecting part, outside is formed by the 3rd light scattering part 47 and the 2nd light scattering part 48.
In Fig. 4 and Fig. 5, the scope that symbol W41 represents is annulus 41, and the scope that symbol W42 represents is ring inside portion 42, and the scope that symbol W43 represents is ring inside portion 42.The edge, periphery of ring outside portion 43, under the state in the main part 16 of convex edge 12 being positioned in housing 10, is located by being clamped by edge, the periphery 51a of main part 16 and diffusion cover body 50.In Figure 5, the scope that symbol W44 represents is the opposed part 44 of element line, the scope that symbol W45 represents is the 1st light scattering part 45, the scope that symbol W46 represents is the 2nd light scattering part 46, the scope that symbol W47 represents is the 3rd light scattering part 47, and the scope that symbol W48 represents is the 4th light scattering part 48.
As shown in Figure 5, the face of the face side of light guide plate 40 is made up of the face 43a of the face 41a of the face side of annulus 41, the face 42a of the face side of ring inside portion 42 and the face side of ring outside portion 43.Further, the face 41a of the face side of annulus 41 is made up of the face of the face 44a of face side of the opposed part 44 of element line, the face of the face side of inner reflection part and the face side of reflecting part, outside.The face of the face side of inner reflection part is reflecting surface, is made up of the face i.e. face of the face side of the 1st light scattering sites 45a and the 2nd light scattering part 46 i.e. the 2nd light scattering sites 46a of the face side of the 1st light scattering part 45.The face of the face side of reflecting part, outside is also reflecting surface, is made up of the face i.e. face of the face side of the 3rd light scattering sites 47a and the 4th light scattering part 48 i.e. the 4th light scattering sites 48a of the face side of the 3rd light scattering part 47.
In addition, the face of the rear side of light guide plate 40 is made up of the face 43b of the face 41b of the rear side of annulus 41, the face 42b of the rear side of ring inside portion 42 and the rear side of ring outside portion 43.Further, the face 41b of the rear side of annulus 41 is made up of the face 48b of the face 44b of the rear side of the opposed part 44 of element line, the face 45b of the rear side of the 1st light scattering part 45, the face 46b of the rear side of the 2nd light scattering part 46, the face 47b of the rear side of the 3rd light scattering part 47 and the rear side of the 4th light scattering part 48.
In addition, light guide plate of the present utility model is not limited to circular plate-like shape but arbitrary.Such as, also can be the polygonal tabulars such as quadrangle tabular, hexagon tabular, octagon tabular.In addition, each shape of annulus, ring inside portion, ring outside portion, the opposed part of element line, the 1st light scattering part, the 2nd light scattering part, the 3rd light scattering part and the 4th light scattering part is also arbitrary according to the shape of light guide plate.Further, the shape of the arrangement of light-emitting component and substrate is also arbitrary according to the shape of light guide plate.
The face 41a of the face side of annulus 41 becomes the reflecting surface for making the light inciding the light-emitting component 22 of annulus 41 from rear side reflect towards ring inside portion 42 or ring outside portion 43.As shown in Figures 4 and 5, in the vertical section (with the center in the face of the face side through light guide plate 40 and the imaginary plane orthogonal with the face of the face side of light guide plate 40 section that cuts off and obtain) of light guide plate 40, the shape of the face 41a of the face side of annulus 41 is substantially V-shaped that the mode of giving prominence to mediad rear side bends.Bending part is the rearwardly R shape heaved of side.The both sides of bending part become the roughly circular arc heaved to face side respectively, reflect efficiently towards ring inside portion 42 and ring outside portion 43 to make light.
Light scattering process is implemented to the face 41a of the face side of annulus 41.Specifically, at the 1st light scattering sites 45a, the 2nd light scattering sites 46a, the 3rd light scattering sites 47a and the 4th light scattering sites 48a, recess 45c, 46c, 47c, 48c is provided with as light scattering process.Owing to implementing light scattering process, the light therefore inciding the face 41a of face side in annulus 41 is not totally reflected, but part scattering due to recess 45c, 46c, 47c, 48c, the outside to light guide plate 40 is penetrated.In addition, recess is not provided with at the face 44a of the face side of the opposed part 44 of element line.
In the present embodiment, the shape of recess 45c, 46c, 47c, 48c is roughly hemispherical respectively, and size is all identical.In addition, the shape of recess of the present utility model and size etc. are arbitrary, as long as can obtain light scattering effect, also can be such as roughly coniform or roughly circular cone shape etc. as shape.
Fig. 7 is the plane of the light guide plate representing the first embodiment, and (a) is the figure observed from face side, and (b) is the figure observed from rear side.As shown in Fig. 7 (a), the 1st light scattering part 45 and the 2nd light scattering part 46 are compared, then the 1st light scattering sites 45a and the 2nd light scattering sites 46a is implemented to the light scattering process of different modes.Specifically, compared with the 1st light scattering sites 45a, the per unit area of recess 45c, 46c of the 2nd light scattering sites 46a more.Therefore, compared with the 1st light scattering part 45, penetrate more light from the 2nd light scattering part 46.
In addition, the 3rd light scattering part 47 and the 4th light scattering part 48 are compared, then the 3rd light scattering sites 47a and the 4th light scattering sites 48a is implemented to the light scattering process of different modes.Specifically, compared with the 3rd light scattering sites 47a, the per unit area of recess 47c, 48c of the 4th light scattering sites 48a more.Therefore, compared with the 3rd light scattering part 47, penetrate more light from the 4th light scattering part 48.
In addition, in the present embodiment, the 1st light scattering part 45 and the 3rd light scattering part 47 are implemented to the light scattering process of same way, the 2nd light scattering part 46 and the 4th light scattering part 48 are also implemented to the light scattering process of same way.That is, for the 1st light scattering sites 45a and the 3rd light scattering sites 47a, the quantity of the per unit area of recess 45c, 47c is identical.In addition, for the 2nd light scattering sites 46a and the 4th light scattering sites 48a, the quantity of the per unit area of recess 46c, 48c is identical.
Return Fig. 5, a part of the face 41b of the rear side of annulus 41 becomes the incident plane of incidence of the light of light-emitting component 22.The face 44b of the rear side of the opposed part 44 of element line is equivalent to this plane of incidence.The face 44b of the rear side of the opposed part of element line 44 is opposed circular of the element line that forms with by multiple light-emitting component 22.Further, the entirety of the face 41b of the rear side of annulus 41 is also played a role to the plane of incidence of annulus 41 incidence by the light after the element mounting face 21a reflection of substrate 21 in element accommodating groove 60 as being used for.
The face 42a of the face side of ring inside portion 42 becomes the light emergence face of the part injection for the light incided in ring inside portion 42.The face 43a of the face side of ring outside portion 43 becomes the light emergence face of the part injection for the light incided in ring outside portion 43.
The face 42b of the rear side in ring inside portion 42, is provided with recess 42c as light scattering process.Thus, the light inciding recess 42c in ring inside portion 42 becomes scattered light, penetrates from the face 42a of face side.As shown in Fig. 7 (b), the closer to the center of the face 42b of the rear side of ring inside portion 42, the quantity of the per unit area of recess 42c is more, thus, penetrates light equably from the face 42a entirety of face side.
The face 43b of the rear side in ring outside portion 43, is provided with recess 43c as light scattering process.Thus, the light inciding recess 43c in ring outside portion 43 becomes scattered light, penetrates from the face 43a of face side.The closer to the outer peripheral edge of the face 43b of the rear side of ring outside portion 43, the quantity of the per unit area of recess 43c is more, thus, penetrates light equably from the face 43a entirety of face side.On the other hand, as shown in Figure 3, the outer peripheral face 43d of ring outside portion 43 is implemented make light not from this outer peripheral face 43d to the processing of the External leakage of light guide plate 40.Advance in ring outside portion 43 and the light reaching outer peripheral face 43d owing to being reflected by outer peripheral face 43d, so can not penetrate from ring outside portion 43, become back light and towards annulus 41.
In addition, the light scattering process implemented ring inside portion 42 and ring outside portion 43 is not limited to above-mentioned process but arbitrary.Such as, as light scattering process, can not recess be set and protuberance is set, also recess and protuberance can be set.In addition, light scattering process can not be implemented face 42b, 43b of rear side and face 42a, 43a of effects on surface side implement, and also can implement face 42a, 43a of face 42b, 43b of rear side and face side.But preferably light penetrates such mode equably from the entirety of the face 43a of the face side of the face 42a of the face side of ring inside portion 42 and ring outside portion 43.
(diffusion cover body)
Diffusion cover body 50 is such as formed by translucent materials such as silicones, acrylic resin, polycarbonate resin, glass, spreads cover body 50 and be fetched to the outside of lighting device 1 from the light transmission of light guide plate 40 injection.
Diffusion cover body 50 has the dome-type main part 51 that covered by light guide plate 40 and rearwardly side is to extended sidewall portion 52 from the circumference of this main part 51, and this sidewall portion 52 is fixed in the flange portion 17 of the convex edge 12 of housing 10.Implement light scattering process to main part 51, the light penetrated from light guide plate 40 is becoming scattered light through during main part 51.Thus, brightness disproportionation alleviates further.In addition, in lighting device of the present utility model, diffusion cover body not necessarily.
(brightness disproportionation of reflection part alleviates effect)
Fig. 8 A and Fig. 8 B is the figure of the brightness disproportionation produced for illustration of lighting device in the past, shows and takes the lighting device of illuminating state and the analysis result of the photo obtained and the brightness disproportionation based on it.Fig. 9 is the schematic diagram of the brightness disproportionation produced for illustration of lighting device in the past, schematically indicates Fig. 8 A and the brightness disproportionation shown in Fig. 8 B.In addition, Fig. 8 A and Fig. 8 B shows the brightness disproportionation across diffusion cover body, and Fig. 9 shows the brightness disproportionation in the face of the face side of light guide plate.
In the lighting device of directly-below type mode in the past, there occurs brightness disproportionation such shown in such as Fig. 8 A and Fig. 8 B.As shown in Figure 9, compared with the part 61 that there is light-emitting component 22, the part 62 that there is not light-emitting component 22 becomes territory, shadow zone, one of this reason becoming brightness disproportionation.In order to alleviate such brightness disproportionation, in the present embodiment, for the part 61 that there is light-emitting component 22, the well width of element accommodating groove 60 narrows, and for the part 62 that there is not light-emitting component 22, the well width of element accommodating groove 60 broadens.
Figure 10 is the schematic diagram of the route of the light reflected for illustration of the element mounting face at substrate, shows the vertical section of the part that there is not light-emitting component 22, represents for the part that there is light-emitting component 22 with double dot dash line.L1 and L2 reflects at the outer peripheral face 43d of ring outside portion 43 and turns back to the back light in element accommodating groove 60.In addition, L3 and L4 penetrates from light-emitting component 22 but does not incide the light of the plane of incidence (the face 44b of the rear side of the opposed part 44 of element line).
As shown in Figure 10, there is not the part of light-emitting component 22, the interval between the well width of element accommodating groove 60 and the outer peripheral face 33a of inner reflection parts 30a and the inner peripheral surface 33b of outside reflection part 30b is wider.Therefore, for the face 41b of the rear side of annulus 41, the area in the region do not covered by reflection part 30 is wider, and light is easily incident in annulus 41 in element accommodating groove 60.Thus, the amount of the light externally penetrated from the face 41a of the face side of annulus 41 is more.Specifically, whole light of L1 ~ L4 externally penetrates.
On the other hand, as represented with double dot dash line, there is the part of light-emitting component 22, the interval between the well width of element accommodating groove 60 and the outer peripheral face 33a of inner reflection parts 30a and the inner peripheral surface 33b of outside reflection part 30b is narrower.Therefore, for the face 41b of the rear side of annulus 41, the area in the region do not covered by reflection part 30 is narrower, and light is difficult in element accommodating groove 60 incident in annulus 41.Thus, the amount of the light externally penetrated from the face 41a of the face side of annulus 41 is less.Specifically, the light of L1 and L3 externally penetrates, but the light of L2 and L4 is stopped by reflection part 30 and externally do not penetrate, and such as there is not the part 62 of light-emitting component 22 towards other regions in element accommodating groove 60.
Figure 11 is the schematic diagram alleviating effect for illustration of the brightness disproportionation of reflection part, ignores to implement to the annulus 41 of light guide plate 40 brightness disproportionation that light scattering process brings and alleviate effect and show brightness.As shown in figure 11, in present embodiment, there is not the part 62 of light-emitting component 22, the well width of element accommodating groove 60 is relatively wide.Therefore, compared with the part 61 that there is light-emitting component 22, the part 62 that there is not light-emitting component 22 more easily penetrates light.Thus, the brightness that there is not the part 62 of light-emitting component 22 uprises, so brightness disproportionation alleviates.
And then, in present embodiment, because the element mounting face 21a of the outer peripheral face 33a of the inner reflection parts 30a of composed component accommodating groove 60, the inner peripheral surface 33b of outside reflection part 30b and substrate 21 becomes light reflection surface respectively, the light therefore in element accommodating groove 60 is incident to annulus 41 efficiently in element mounting face 21a reflection.Thus, the light in element accommodating groove 60 is easier to be penetrated from annulus 41, is difficult to produce territory, shadow zone at annulus 41.
In addition, in present embodiment, the outer peripheral face 33a of inner reflection parts 30a and the element mounting face 21a angulation θ 1 of substrate 21 is acute angles, and the inner peripheral surface 33b of outside reflection part 30b and the element mounting face 21a angulation θ 2 of substrate 21 is also acute angle.Therefore, the light in element accommodating groove 60 is easier to be assembled to element mounting face 21a, is reflected and the easy face 41a to the rear side of annulus 41 is incident by element mounting face 21a.Thus, the light in element accommodating groove 60 is easier to be penetrated from annulus 41, is difficult to produce territory, shadow zone at annulus 41.In addition, in order to make, the light in element accommodating groove 60 is easier to be assembled to element mounting face 21a, and angle θ 1 and angle θ 2 is preferably less than 90 °, is more preferably 45 ° ~ 75 °.
(brightness disproportionation of light guide plate alleviates effect)
In the lighting device of directly-below type mode in the past, at annulus, light is from the opposed part injection of the element line opposed with light-emitting component, but light arranges the part injection beyond opposed part from said elements hardly, therefore creates territory, shadow zone like that shown in such as Fig. 8 A and Fig. 8 B.Further, territory, shadow zone more from the opposed part of element away from then brightness is lower.Specifically, as shown in Figure 9, the brightness of the part 63 close with light-emitting component 22 is higher, and the brightness step-down of part 64 away from light-emitting component 22, one of its luminance difference reason becoming brightness disproportionation.In order to make such brightness disproportionation alleviate, in the present embodiment, light scattering process is implemented to annulus 41.Further, by implementing this light scattering process, making, compared with the 1st light scattering part 45, to penetrate more light from the 2nd light scattering part 46, compared with the 3rd light scattering part 47, penetrating more light from the 4th light scattering part 48.
Figure 12 is the schematic diagram for illustration of the route being directly incident on the light in light guide plate from light-emitting component.In fig. 12, as shown in L5, such as reflected at the face 41a of the face side of annulus 41 from the light of the face 44b incidence of the rear side of the opposed part 44 of element line, and be directed into ring inside portion 42, between the face 42a of the face side in ring the inside portion 42 and face 42b of rear side, interreflection while advance in ring inside portion 42.Or as shown in L6, reflected at the face 41a of the face side of annulus 41, and be directed in ring outside portion 43, between the face 43a of the face side in ring the outside portion 43 and face 43b of rear side, interreflection while advance in ring outside portion 43.
The part of the light of L5 and L6 is incident and become scattered light, from face 42a, 43a injection of face side to recess 42c, 43c.Such as, penetrate from the face 43a of face side as the light of L6.In addition, in the process of advancing in ring inside portion 42, the part of the light of L5 is also incident and become scattered light to recess 42c, penetrates from the face 42a of face side.
Like this, the face 41a of the face side of annulus 41 becomes the light reflection for making to incide annulus 41 and the reflecting surface guided to ring inside portion 42 or ring outside portion 43 substantially.Therefore, light is difficult to penetrate from annulus 41, easily produces territory, shadow zone at annulus 41.But, in present embodiment, be provided with recess 45c, 46c, 47c, 48c at the face 41a of the face side of annulus 41, therefore as shown in L7 and L8, also penetrate light from the face 41a of the face side of annulus 41.Thus, be difficult to produce territory, shadow zone at annulus 41.
In addition, penetrate easness is not identical in the Zone Full of the face 41a of the face side of annulus 41.That is, be easier to injection from the 2nd light scattering sites 46a and the 4th light scattering sites 48a ratio, compare from the 1st light scattering sites 45a and the 3rd light scattering sites 47a and be difficult to injection.This is because the quantity of the per unit area of set recess 45c, 46c, 47c, 48c is different.
In addition, at the face 44a of the face side of the opposed part 44 of element line, there is the bending part of R shape as described above, at this bending part, as shown in L9, light former state externally penetrates through light guide plate 40.Thus, the face side of the opposed part 44 of element line face 44a and near do not need to arrange recess, if arrange recess, this part too bright noticeable on the contrary.Preferably, in vertical section, the region not arranging recess is 2 times of the width of light-emitting component 22 ~ 3 times.If less than 2 doubly, too bright noticeable, if more than 3 times, too dimmed.In addition, the R of bending part preferably below 5/100, more preferably below 2/100.If R is more than 5/100, the part become clear is too eye-catching.
Figure 13 is the schematic diagram alleviating effect for illustration of the brightness disproportionation of light guide plate, and the brightness disproportionation ignoring reflection part 30 alleviates effect and shows brightness.As shown in figure 13, in present embodiment, because the face 41a of the face side to annulus 41 implements light scattering process, therefore also penetrate light from annulus 41.Thus, the brightness of annulus 41 relatively uprises compared with lighting device in the past, and brightness disproportionation alleviates.
In addition, the 1st light scattering part 45 close compared to part 44 opposed with element line and the 3rd light scattering part 47, more light is penetrated from away from the 2nd light scattering part 46 of the opposed part of element line 44 and the 4th light scattering part 48, therefore and the close part 63 of light-emitting component 22 and away from light-emitting component 22 part 64 between luminance difference eliminated, brightness disproportionation alleviates.
(brightness disproportionation be multiplied brought by reflection part and light guide plate alleviates effect)
Figure 14 A and Figure 14 B is the figure that the brightness disproportionation brought for illustration of the combination by light guide plate and reflection part alleviates effect, shows the analysis result lighting device of illuminating state being taken to the photo that obtains and the brightness disproportionation based on it.Figure 15 is the schematic diagram that the brightness disproportionation brought for illustration of the combination by light guide plate and reflection part alleviates effect, schematically show Figure 14 A and the brightness disproportionation shown in Figure 14 B.In addition, Figure 14 A and Figure 14 B illustrates the brightness disproportionation across diffusion cover body, and Figure 15 illustrates the brightness disproportionation in the face of the face side of light guide plate.
The lighting device 1 of present embodiment, owing to reflection part 30 and light guide plate 40 being combinationally used, therefore plays the brightness disproportionation brought by reflection part and alleviates effect and the brightness disproportionation that brought by light guide plate alleviates the effect of effect these two aspects.Thus, the lighting device 1 almost not having Figure 14 A and Figure 14 B and brightness disproportionation is as shown in Figure 15 become.
In addition, as long as the structure that lighting device of the present utility model at least possesses about light guide plate alleviates effect to make the brightness disproportionation that can obtain being brought by light guide plate, the structure about reflection part is arbitrary.Thus, about reflection part, structure in the past can be adopted.
< second embodiment >
Figure 16 is the exploded perspective view of the lighting device representing the second embodiment.Figure 17 is the profile of the lighting device representing the second embodiment.Figure 18 is the amplification profile of the part that the double dot dash line shown in Figure 17 is surrounded.
The lighting device 100 of the second embodiment is compared with the lighting device 1 of the first embodiment, and larger difference is: reflection part 30 is only made up of inner reflection parts 30a, and light guide plate 140 does not possess ring outside portion.Because the point identical with the lighting device 1 of the first embodiment is also more, the difference both therefore only illustrating, uses identical symbol for common structure and omits the description.
As shown in Figure 16 ~ Figure 18, lighting device 1 such as possesses housing 110, light emitting module 120, inner reflection parts 30a, light guide plate 140 and diffusion cover body 150 etc.
(housing)
As shown in figure 16, housing 110 is plate-likes of such as die casting aluminum, possesses the main part 111 of bottomed cylindrical, and main part 111 has the sidewall sections 114 of discoideus bottom parts 113 and the cylindrical shape extended in the outer peripheral edge of bottom parts 113.As shown in figure 17, in the inside of main part 111, be accommodated with a part for light emitting module 120, inner reflection parts 30a and light guide plate 140.Turning back to Figure 16, at the sidewall sections 114 of main part 111, being formed with the through hole 115 for making power line 23 insert.
(light emitting module)
The substrate 121 that light emitting module 120 has annulus tabular and the multiple light-emitting components 22 be mounted on the interarea of a side of this substrate 121 and element mounting face 121a, and be configured in the rear side of light guide plate 140.Each light-emitting component 22 is arranged as circular to make respective main injection direction towards the state of light guide plate 140 on the element mounting face 121a of substrate 121, and is provided with interval between adjacent light-emitting component.Compared with the substrate 21 of the first embodiment, substrate 121 is roughly identical except the less this point of profile.Each light-emitting component 22 is via being formed at the Wiring pattern (not shown) of substrate 121 and connector 24 and being electrically connected with power line 23.The element mounting face 121a of substrate 121 becomes for making light effectively to the reflecting surface of light guide plate 140 lateral reflection.
(reflection part)
Reflection part is only made up of the inner reflection parts 30a of the first embodiment, and as shown in figure 17, this reflection part configures close to light guide plate 140 in the rear side of light guide plate 140.Specifically, in the rear side of the ring inside portion 142 of light guide plate 140, avoid light-emitting component 22 and configure.In other words, observe from face (the face 142b of rear side) the orthogonal direction of the rear side with light guide plate 140, inner reflection parts 30a be configured in not with element accommodating groove (groove portion) 160 region overlapped of ring-type of element line being accommodated with the ring-type be made up of multiple light-emitting component 22.
As shown in figure 18, the 1st light reflection surface 31a of inner reflection parts 30a is opposed with the face 142b of the rear side of the ring inside portion 142 of light guide plate 140, plays and makes the light that rearwardly side is leaked from ring inside portion 142 reflect and return the effect of ring inside portion 142.2nd light reflection surface 32a is opposed with the face 146b of the rear side of the 2nd light scattering part 146 of the annulus 141 of light guide plate 140, plays and makes reflect from the 2nd light scattering part 146 light that rearwardly side is leaked and return the effect of the 2nd light scattering part 146.1st light reflection surface 31a carries out face with the face 142b of the rear side of ring inside portion 142 and contacts, and the 2nd light reflection surface 32a carries out face with the face 146b of the rear side of the 2nd light scattering part 146 and contacts.
Inner reflection parts 30a and housing 110 configure with following state, that is: in the rear side of light guide plate 140, a part for the sidewall sections 114 of the outer peripheral face 33a of inner reflection parts 30a and the main part 111 of housing 110 is spaced apart and mutually opposing.Thus, the element accommodating groove 160 of the ring-type of regulation storage light-emitting element 22 is carried out by inner reflection parts 30a and housing 110.In the rear side of the annulus 141 of light guide plate 140, the part that there is not inner reflection parts 30a is element accommodating groove 160.
The inside circumference of element accommodating groove 160 is made up of the outer peripheral face 33a of inner reflection parts 30a, the outside circumference of element accommodating groove 60 is made up of the inner peripheral surface of the sidewall sections 114 of housing 110, and the bottom surface of element accommodating groove 160 is made up of the element mounting face 121a of substrate 121.In addition, the outer peripheral face 33a of inner reflection parts 30a and the element mounting face 121a angulation θ 1 of substrate 121 is acute angles.In addition, the well width of element accommodating groove 160 temporarily broadens from face side towards rear side.In addition, the inner peripheral surface of the sidewall sections 114 of housing 110 becomes reflecting surface.
(light guide plate)
As shown in figure 16, light guide plate 140 is circular plate-like shape, is made up of annulus 141 and ring inside portion 142, and this annulus 141 is formed as circular along the element line be made up of light-emitting component 22, and this ring inside portion 142 is the discoideus of outer periderm annulus 141 encirclement.These annulus 141 and ring inside portion 142 are shaped integratedly.
Annulus 141 is made up of the opposed part 144 of element line, the 1st light scattering part 145 and the 2nd light scattering part 146.Inner reflection part is formed by the 1st light scattering part 145 and the 2nd light scattering part 146.The opposed part of element line 144 is opposed circular of the element line that forms with by multiple light-emitting component 22.1st light scattering part 145 be positioned at the opposed part of element line 144 ring inside and circular along the opposed part of element line 144.2nd light scattering part 146 be positioned at the 1st light scattering part 145 ring inside and circular along the 1st light scattering part 145.
In fig. 17, the scope that symbol W141 represents is annulus 141, and the scope that symbol W142 represents is ring inside portion 142.In figure 18, the scope that symbol W144 represents is the opposed part 144 of element line, and the scope that symbol W145 represents is the 1st light scattering part 145, and the scope that symbol W146 represents is the 2nd light scattering part 146.
In addition, light guide plate of the present utility model is not limited to circular plate-like shape but arbitrary.Such as, also can be the polygonal tabulars such as quadrangle tabular, hexagon tabular, octagon tabular.In addition, each shape of annulus, ring inside portion, ring outside portion, the opposed part of element line, the 1st light scattering part, the 2nd light scattering part, the 3rd light scattering part and the 4th light scattering part is also arbitrary according to the shape of light guide plate.And then the arrangement of light-emitting component and the shape of substrate are also arbitrary according to the shape of light guide plate.
The face 141a of the face side of annulus 141 becomes the reflecting surface for making the light inciding the light-emitting component 22 of annulus 141 from rear side reflect to ring inside portion 142.In the vertical section of light guide plate 140, the shape of the face 141a of the face side of annulus 141 is the roughly circular arc heaved to face side.
Light scattering process is implemented to the face 141a of the face side of annulus 141.Specifically, forming the face of face side of the 1st light scattering part 145 in face of face side of inner reflection part and the face of the face side of the 2nd light scattering part 146, i.e. the 1st light scattering sites 145a and the 2nd light scattering sites 146a, be provided with recess 145c, 146c as light scattering process.Owing to implementing light scattering process, the light therefore inciding the face 141a of face side in annulus 141 is not be totally reflected but part scattering because of recess 145c, 146c, and penetrates to the outside of light guide plate 140.In addition, at the face 144a of the face side of the opposed part 144 of element line, recess is not set.The shape of recess 145c, 146c is roughly hemispherical respectively, and size is all identical.
1st light scattering part 145 and the 2nd light scattering part 146 are compared, then the 1st light scattering sites 145a and the 2nd light scattering sites 146a is implemented to the light scattering process of different modes.Specifically, compared with the 1st light scattering sites 145a, the quantity of the per unit area of recess 145c, 146c of the 2nd light scattering sites 146a is more.Therefore, compared with the 1st light scattering part 145, penetrate more light from the 2nd light scattering part 146.
The light that a part of the face 141b of the rear side of annulus 141 becomes light-emitting component 22 carries out the incident plane of incidence.The face 144b of the rear side of the opposed part 144 of element line is equivalent to this plane of incidence.The face 144b of the rear side of the opposed part of element line 144 is opposed circular of the element line that forms with by multiple light-emitting component 22.And then the face 141b entirety of the rear side of annulus 141 is also played a role to the plane of incidence of annulus 141 incidence by the light after the element mounting face 121a reflection of substrate 121 in element accommodating groove 160 as making.
The structure of ring inside portion 142 is roughly the same with the ring inside portion 42 of the first embodiment.
(diffusion cover body)
Diffusion cover body 150 has the dome-type main part 151 that covered by light guide plate 140 and rearwardly side is to extended sidewall portion 152 from the circumference of this main part 151, and this sidewall portion 152 is fixed in the sidewall sections 114 of the main part 111 of housing 110.Implement light scattering process to main part 151, the light penetrated from light guide plate 140 is becoming scattered light through during main part 151.
(brightness disproportionation of reflection part alleviates effect)
In present embodiment also in the same manner as the first embodiment, at the position (position corresponding with light-emitting component 22) that there is not light-emitting component 22, the well width of element accommodating groove 160 is relatively expanded.In addition, the outer peripheral face 33a of the inner reflection parts 30a of composed component the accommodating groove 160 and element mounting face 121a of substrate 121 becomes light reflection surface respectively.And then the outer peripheral face 33a of inner reflection parts 30a and the element mounting face 121a angulation θ 1 of substrate 121 is acute angles.Thus, the effect identical with the first embodiment can be obtained.
(brightness disproportionation of reflection part and light guide plate alleviates effect)
In present embodiment also in the same manner as the first embodiment, implement light scattering process to the face 141a of the face side of annulus 141, therefore the brightness of annulus 141 relatively uprises compared with lighting device in the past, and brightness disproportionation alleviates.In addition, compared with the 1st light scattering part 145 close to the opposed part 144 of element line, more light is penetrated from the 2nd light scattering part 146 away from the opposed part of element line 144, therefore close to light-emitting component 22 part 63 and away from light-emitting component 22 part 64 between luminance difference eliminated, brightness disproportionation alleviates.
The lighting device 100 of present embodiment, owing to inner reflection parts 30a and light guide plate 140 being combinationally used, therefore plays the brightness disproportionation brought by reflection part and alleviates effect and the brightness disproportionation that brought by light guide plate alleviates the effect of effect these two aspects.In addition, as long as the structure that lighting device of the present utility model at least possesses about light guide plate alleviates effect to make the brightness disproportionation that can obtain being brought by light guide plate, the structure about reflection part is arbitrary.Thus, reflection part can adopt structure in the past.
< variation >
Below, the variation of lighting device of the present utility model is described.Figure 19 is the profile of light guide plate for illustration of variation and reflection part.
(reflection part)
In first embodiment, the element mounting face 21a of the substrate 21 and outer peripheral face 33a angulation θ 1 of inner reflection parts 30a is acute angle, and as shown in figure 19, the element mounting face 21a of the substrate 21 and outer peripheral face 233a angulation θ 1 of inner reflection parts 230a both can be right angle also can be obtuse angle.In addition, in first embodiment, the element mounting face 21a of the substrate 21 and inner peripheral surface 33b angulation θ 2 of outside reflection part 30b is acute angle, and as shown in figure 19, the element mounting face 21a of the substrate 21 and inner peripheral surface 233b angulation θ 2 of outside reflection part 230b both can be right angle also can be obtuse angle.
(light guide plate)
About light guide plate of the present utility model, the light scattering process arranged annulus 41 is not limited to the 1st embodiment but arbitrary.Such as, as light scattering process, also can not be provided with recess and be provided with protuberance, also can be provided with both recess and protuberance.
In addition, in the light guide plate 40 of the first embodiment, make the mode of light scattering process different by changing the quantity of the per unit area of recess 45c, 46c, 47c, 48c of arranging at the face 41a of the face side of annulus 41, but also the mode of light scattering process can be made different by other method.
Such as, in the light guide plate 240 shown in Figure 19, the quantity of the per unit area of recess 45c, 46c, 47c, 48c is identical, but by making to vary in size, achieves the light scattering process of different modes.That is, by making the area ratio/occupancy ratio of recess 45c, 46c, 47c, 48c different, making the area in the region played a role as light reflection surface on the face 41a of the face side of annulus 41 different, thus achieving the mode of different light scattering process.
Specifically, the quantity of per unit area of the recess 245c arranged at the 1st light scattering sites 245a is identical with the quantity of the per unit area of the recess 246c arranged at the 2nd light scattering sites 246a.But each recess 245c is less than each recess 246c.Therefore, the area in the region played a role as light reflection surface in area ratio the 2nd light scattering sites 246a in the region played a role as light reflection surface in the 1st light scattering sites 245a is little.Thus, compared with the 1st light scattering part 245, penetrate more light from the 2nd light scattering part 246.
In addition, recess 245c is due to less than recess 246c, and therefore light scattering function is lower compared with recess 246c.Thus, also due to the difference of light scattering function, compared with the 1st light scattering sites 245a, penetrate more light from the 2nd light scattering sites 246a.
Equally, the quantity of per unit area of the recess 247c arranged at the 3rd light scattering sites 247a is identical with the quantity of the per unit area of the recess 248c arranged at the 4th light scattering sites 248a.But each recess 246c is less than each recess 248c.Thus, compared with the 3rd light scattering part 247, penetrate more light from the 4th light scattering part 248.
Can think, the size of each recess 245c, 246c, 247c, 248c changes based on such as following formula 1.
Dr=k1-R^n/cos (m* θ)+k2... (formula 1)
In addition, " Dr " is the footpath of recess, and " R " is the distance from light-emitting component to recess, and " θ " is the deflection angle (with reference to Figure 19) of recess relative to the optical axis of light-emitting component, and " k1 ", " k2 ", " n ", " m " are constants.
As long as make the size variation of each recess 245c, 246c, 247c, 248c based on formula 1, the energy of the light of releasing from each recess 245c, 246c just can be adjusted.In addition, the size of recess also can be made to fix, make the number change of the per unit area of recess based on formula 1.
Recess 45c, 46c, 47c, 48c are set as described above, also can eliminate the luminance difference between the part close to light-emitting component 22 and the part away from light-emitting component 22, brightness disproportionation is alleviated.
In addition, in first embodiment, between the opposed part 44 of element line and ring inside portion 42, the light scattering process of different modes is implemented with the 1st light scattering part 45 and the 2nd light scattering part 46 such 2 stages, but also between the opposed part 44 of element line and ring inside portion 42, light scattering process can be implemented with different modes more than 2 stages.In addition, may not be and periodically implement light scattering process, to make more to carry out scattering away from element line opposed part 44 light more gradually as gradual change.The opposed part of element line 44 be also same between ring outside portion 43.
(other)
Describe the structure of lighting device of the present utility model above based on embodiment and variation, but the utility model is not limited to above-mentioned embodiment and variation thereof.Such as, also can be by structure appropriately combined for the part-structure of above-mentioned embodiment and variation thereof.In addition, the material recorded in the above-described embodiment, numerical value etc. illustrate only preferred situation and are not limited thereto.And then, in the scope not departing from technological thought scope of the present utility model, suitably can be changed structure.
It is all that lighting device of the present utility model extensively can be used in the lighting uses such as ceiling light, lower shot-light, back of the body lamp.
Symbol description
1,100 lighting devices
21,121 substrates
21a, 121a element mounting face
22 light-emitting components
30 reflection parts
30a, 230a inner reflection parts
Reflection part outside 30b, 230b
The light reflection surface of 31a, 32a inner reflection parts
The light reflection surface of reflection part outside 32b, 32b
The outer peripheral face in 33a, 233a inner reflection portion
The inner peripheral surface of reflection part outside 33b, 233b
40,140,240 light guide plates
41,141 annulus
42,142 ring inside portions
43,143 ring outside portions
The opposed part of 44,144 element line
44b, the 144b plane of incidence
45,145,245 the 1st light scattering parts (inner reflection part)
45a, 145a, 245a the 1st light scattering sites
46,146,246 the 2nd light scattering parts (inner reflection part)
46a, 146a, 246a the 2nd light scattering sites
47a, 147a, 247a the 3rd light scattering sites
48a, 148a, 248a the 4th light scattering sites
45c, 46c, 47c, 48c, 145c, 146c, 245c, 246c, 247c, 248c recess
47,247 the 3rd light scattering parts (reflecting part, outside)
48,248 the 4th light scattering parts (reflecting part, outside)
60,160 element accommodating grooves (groove portion)

Claims (8)

1. a lighting device, in the rear side of light guide plate, multiple light-emitting component is configured to ring-type with respective main injection direction towards the state of above-mentioned light guide plate, and the feature of this lighting device is,
Above-mentioned light guide plate possesses the annulus being formed as ring-type along the element line be made up of above-mentioned multiple light-emitting component and the ring inside portion formed in above-mentioned annulus continuously inside the ring of above-mentioned annulus;
Above-mentioned annulus possesses the opposed part of element line and inner reflection part, it is arrange opposed part with said elements that said elements arranges opposed part, there is the plane of incidence that the light that penetrates from above-mentioned light-emitting component is incident, above-mentioned inner reflection part is positioned to arrange the part of opposed part by side, above-mentioned ring inside portion than said elements, has the reflecting surface making to reflect from the light of above-mentioned plane of incidence incidence towards above-mentioned ring inside portion;
Above-mentioned reflecting surface possesses the 1st light scattering sites and the 2nd light scattering sites, above-mentioned 1st light scattering sites in the form of a ring, being arranged opposed part along said elements implements light scattering process, above-mentioned 2nd light scattering sites is than the region of above-mentioned 1st light scattering sites by side, above-mentioned ring inside portion, be implemented the light scattering process of the form different from above-mentioned 1st light scattering sites, to make to penetrate more light than above-mentioned 1st light scattering sites.
2. lighting device as claimed in claim 1, is characterized in that,
As the light scattering process implemented above-mentioned 1st light scattering sites and above-mentioned 2nd light scattering sites, be provided with recess and/or protuberance at above-mentioned reflecting surface.
3. lighting device as claimed in claim 2, is characterized in that,
Compared with above-mentioned 1st light scattering sites, the quantity of the above-mentioned above-mentioned recess of the 2nd light scattering sites and the per unit area of protuberance is many.
4. lighting device as claimed in claim 2, is characterized in that,
Compared with above-mentioned 1st light scattering sites, the above-mentioned recess of above-mentioned 2nd light scattering sites and the area ratio/occupancy ratio of protuberance high.
5. lighting device as claimed in claim 1, is characterized in that,
Above-mentioned light guide plate also possesses the ring outside portion formed in above-mentioned annulus continuously outside the ring of above-mentioned annulus;
Above-mentioned annulus also possesses reflecting part, outside, and outside this, reflecting part is positioned to arrange the part of opposed part by side, above-mentioned ring outside portion than said elements, has the reflecting surface making to reflect from the light of above-mentioned plane of incidence incidence towards above-mentioned ring outside portion;
The reflecting surface of reflecting part, above-mentioned outside possesses the 3rd light scattering sites and the 4th light scattering sites, above-mentioned 3rd light scattering sites in the form of a ring, being arranged opposed part along said elements implements light scattering process, above-mentioned 4th light scattering sites is than the region of above-mentioned 3rd light scattering sites by side, above-mentioned ring outside portion, be implemented the light scattering process of the form different from above-mentioned 3rd light scattering sites, to make to penetrate more light than above-mentioned 3rd light scattering sites.
6. lighting device as claimed in claim 5, is characterized in that,
As the light scattering process implemented above-mentioned 3rd light scattering sites and above-mentioned 4th light scattering sites, be provided with recess and/or protuberance at the reflecting surface of reflecting part, above-mentioned outside.
7. lighting device as claimed in claim 6, is characterized in that,
Compared with above-mentioned 3rd light scattering sites, the quantity of the above-mentioned above-mentioned recess of the 4th light scattering sites and the per unit area of protuberance is many.
8. lighting device as claimed in claim 6, is characterized in that,
Compared with above-mentioned 3rd light scattering sites, the above-mentioned recess of above-mentioned 4th light scattering sites and the area ratio/occupancy ratio of protuberance high.
CN201390000713.7U 2012-09-05 2013-06-27 Lighting device Expired - Fee Related CN204573617U (en)

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JP2012194807 2012-09-05
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CN109425926B (en) * 2017-08-31 2020-11-03 南宁富桂精密工业有限公司 Electronic device with light guide structure
JP7113372B2 (en) * 2018-09-21 2022-08-05 パナソニックＩｐマネジメント株式会社 lighting equipment
JP7266190B2 (en) * 2019-02-22 2023-04-28 パナソニックＩｐマネジメント株式会社 lighting equipment
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