KR20110060473A - Lighting device and optical plate - Google Patents

Lighting device and optical plate Download PDF

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Publication number
KR20110060473A
KR20110060473A KR1020090117070A KR20090117070A KR20110060473A KR 20110060473 A KR20110060473 A KR 20110060473A KR 1020090117070 A KR1020090117070 A KR 1020090117070A KR 20090117070 A KR20090117070 A KR 20090117070A KR 20110060473 A KR20110060473 A KR 20110060473A
Authority
KR
South Korea
Prior art keywords
uneven structure
optical plate
light
light source
present
Prior art date
Application number
KR1020090117070A
Other languages
Korean (ko)
Inventor
테츠오 아리요시
Original Assignee
삼성엘이디 주식회사
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 삼성엘이디 주식회사 filed Critical 삼성엘이디 주식회사
Priority to KR1020090117070A priority Critical patent/KR20110060473A/en
Publication of KR20110060473A publication Critical patent/KR20110060473A/en

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Classifications

    • 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
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/01—Housings, e.g. material or assembling of housing parts
    • 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
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/049—Patterns or structured surfaces for diffusing light, e.g. frosted surfaces
    • 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
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
    • F21V3/062—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The present invention relates to a lighting apparatus, and an aspect of the present invention is disposed on a light source and a path of light emitted from the light source, and an uneven structure for controlling an emission angle of light emitted from the light source, and a region between the uneven structure. The present invention provides a lighting apparatus including an optical plate having a size smaller than that of the uneven structure.

In the case of using the optical plate proposed in the present invention, the uniformity of light emitted to the outside is improved, while the glare is reduced, so that light with high comfort can be obtained. In the case of a lighting apparatus using such an optical plate as a cut-off structure for reducing glare, the conventional louver structure is removed to enable thinness.

Lighting device, LED, Glare, Unevenness, Diffusion

Description

Lighting device and optical plate

The present invention relates to a lighting device, in particular a lighting device using an LED as a light source and an optical plate that can be provided therewith.

Factors affecting the comfort of the lighting device include an illumination method, a type of light source, an illuminance, a light source, and a luminance of the surroundings. When the light source provided in the lighting device is directly viewed, the glare may be excessively strong, and the discomfort caused by this may be generally referred to as glare. A structure using a diffusion plate has been proposed to implement a lighting device to reduce glare. However, when light is reflected from a PC monitor or viewed from a distant place, the light may directly enter the eye, and thus it is difficult to greatly reduce the glare.

1 is a cross-sectional view showing a conventional lighting device using a diffusion plate, Figure 2 shows a light distribution curve obtained when using the lighting device of FIG. Referring to FIG. 1, in the conventional lighting device 10, a light emitting device 11 is disposed inside a housing 12, and a diffusion plate 13 is disposed above the light emitting device 11 to diffuse light emitted from the light emitting device 11. do. The diffusion plate 13 may have a structure in which fine scattering particles are dispersed in the transparent resin. When the diffusion plate 13 is used, the light may be uniform throughout the light emitting surface, and the glare may be reduced to some extent. However, as can be seen in the light distribution curve of FIG. 2, light having a relatively large angle with the optical axis is present among the light emitted through the diffusion plate 13, and there is a problem in that glare is generated by the light.

Alternatively, a louver structure, that is, a grid-shaped cutoff structure may be provided. The cutoff structure refers to an optical structure that shields the light emitted from the light source from the light axis at a predetermined angle or more. In general, the louver structure is a lattice-shaped structure, which is generally made of a metal having excellent reflection performance, and glare can be reduced because the light emission angle of the louver structure is limited. However, when the louver structure is used, the luminous efficiency may be greatly reduced, and furthermore, since the weight and size of the louver structure itself are relatively large, there is a problem in that the thickness of the lighting device is disadvantageous.

One object of the present invention is to provide a lighting device that is uniform in thickness and reduces glare and thus provides high comfort, and furthermore, to provide a thinner lighting device and an optical plate.

In order to realize the above technical problem, an aspect of the present invention,

Is disposed on the light source and the path of the light emitted from the light source, and the concave-convex structure for controlling the emission angle of the light emitted from the light source, and formed in the region between the concave-convex structure having a smaller size than the concave-convex structure having the fine pattern It provides a lighting device comprising an optical plate.

In one embodiment of the present invention, the optical plate may be disposed such that the surface opposite to the surface on which the uneven structure is formed faces the light source.

In one embodiment of the present invention, the optical plate may have a flat surface opposite the surface on which the uneven structure is formed.

In one embodiment of the present invention, the uneven structure may have a prism shape.

In one embodiment of the present invention, the uneven structure may have a cone or polygonal shape.

In this case, the vertex angle in the cone or polygonal pyramid may be 100 ~ 140 °.

In addition, the ratio of the area of the bottom surface of the uneven structure and the area of the region where the fine pattern is formed may be 9: 1 to 6: 4.

In one embodiment of the present invention, the optical plate may be made of one material selected from the group consisting of polycarbonate, acrylic, polystyrene and polyethylene terephthalate.

In one embodiment of the present invention, the light source may be a plurality of light emitting diodes.

In one embodiment of the present invention, it may further include a housing for receiving the light source therein.

Another aspect of the invention,

Between a translucent substrate having first and second surfaces opposing each other, an uneven structure spaced apart from each other such that at least a portion of the first surface is exposed on the first surface of the translucent substrate, and the uneven structure of the first surface. The optical plate includes a fine pattern formed in a smaller size than the uneven structure in the exposed region.

In one embodiment of the present invention, the light transmissive substrate and the concave-convex structure may be made of the same material.

In one embodiment of the present invention, the uneven structure may have a prism shape.

In one embodiment of the present invention, the uneven structure may have a cone or polygonal shape.

In one embodiment of the present invention, the vertex angle in the cone or polygonal pyramid may be 100 ~ 140 °.

In one embodiment of the present invention, the ratio of the area of the bottom surface of the uneven structure and the area of the region where the fine pattern is formed may be 9: 1 to 6: 4.

In the case of using the optical plate proposed in the present invention, the uniformity of light emitted to the outside is improved, while the glare is reduced, so that light with high comfort can be obtained. In the case of a lighting apparatus using such an optical plate as a cut-off structure for reducing glare, the conventional louver structure is removed to enable thinness.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity, and the elements denoted by the same reference numerals in the drawings are the same elements.

3 and 4 show an optical plate according to an embodiment of the present invention, and correspond to a perspective view and a cross-sectional view, respectively. 3 and 4, the optical plate 103 provided in the present embodiment includes a plurality of uneven structures 103a formed on the light transmissive substrate 103c. In this case, the uneven structures 103a are disposed to be spaced apart from each other without being in contact with each other so that at least a portion of the upper surface of the light transmissive substrate 103c, that is, the region corresponding to the uneven structures 103a is exposed to the outside. As enlarged in FIG. 4, a fine pattern 103b having a smaller size than the uneven structure 103a is formed in the region between the uneven structure 103a as a structure for light scattering. The light transmissive substrate 103c may be used without limitation as long as it is a material that transmits light, but it is preferable to use a transparent plastic material such as PMMA, polycarbonate, acrylic, polystyrene, polyethylene terephthalate, or the like. The uneven structure 103a may be made of the same material as the light transmissive substrate 103c. In this case, the uneven structure 103a may be formed by etching the surface of the light transmissive substrate 103c.

The concave-convex structure 103a may have a prism shape, and as shown in FIG. 3, the concave-convex structure 103a may have a conical shape, a polygonal shape, or the like. In this case, it is possible to adjust the vertex angle (θ) of the uneven structure 103a and the like to make the radiation angle of the light passing through the optical plate 103 to a desired level, in terms of reducing glare, about 45 ~ 60 ° or more with respect to the optical axis In the case of the horn-shaped concave-convex structure 103a so as to block light (see FIG. 6), the vertex angle θ preferably has a shape of a condition of about 100 to 140 °. Furthermore, the area where the fine pattern 103b serving as the light scattering function is formed also needs to be appropriately adjusted as compared with the forming area of the uneven structure 103a. In the case of the horn shape, the ratio of the area of the bottom surface of the uneven structure 103a to the area of the region where the fine pattern 103b is formed may be about 9: 1 to 6: 4. Here, the area of the region where the fine pattern 103b is formed refers to the area of the light transmissive substrate 103c corresponding to the region where the fine pattern 103b is to be formed, and does not mean the entire pattern area of the fine pattern 103b. something to do.

The optical plate 103 of the present embodiment can be used as a cut-off structure for reducing glare in an illumination device, and also performs a function of making the intensity of emitted light uniform as a whole. That is, only the optical plate 103 may be used to implement all the functions of the conventional diffuser and louver, and may contribute to miniaturization of the lighting device. Such a function may be implemented by an appropriate combination of the above-described concave-convex structure 103a and the fine pattern 103b, which will be described in detail with reference to FIGS. 5 and 6.

FIG. 5 schematically shows a path and intensity distribution of light that may be obtained when the optical plate proposed in the present invention is used in an illumination device, and FIG. 6 shows a light distribution curve. Referring to FIG. 5, light emitted from the light emitting element 101 is emitted to the outside via the optical plate 103 having the structures of FIGS. 3 and 4. In this case, when viewed from the top of the optical plate 103, the light intensity is relatively low in the region where the light emitting element 101 is not located. That is, in the area between two adjacent light emitting elements 101, the intensity of the light that proceeds directly through the optical plate 103 becomes low, so that the contrast becomes clear, which makes it less suitable for use as illumination.

In the case of this embodiment, as shown in FIG. 5, the fine pattern 103c is formed in the region between the uneven structure 103a so that light passing therethrough is scattered. When the light is scattered in various directions by the fine pattern 103c, the intensity of light is increased in the region where the light emitting device 101 is not located, so that the difference between the dark portion and the bright portion of the entire light emitting surface may be reduced. It offers the advantage that no sharp change occurs at the boundary part. In addition, when the optical plate 103 according to the present embodiment is used, as shown in the light distribution curve of FIG. 6, light of about 45 to 60 ° or more with respect to the optical axis can be shielded to provide light with reduced glare. have. As described above, the light blocking effect may be implemented by appropriately adjusting the vertex angle, size, and the like of the concave-convex structure 103a having the shape of a cone.

FIG. 7 schematically illustrates paths and path distributions of light that may be obtained when an optical plate to which a fine pattern is not applied is used as an example for comparison with an embodiment of the present invention. Referring to FIG. 7, when the prism sheet 103 ′ to which the fine pattern is not applied is used, the scattering effect of the light passing therethrough is greatly reduced, and in particular, there is a problem in which dark portions appear in the region between the light emitting devices 102. Accordingly, since the contrast is clearly seen on the light emitting surface, it is inadequate for use as a lighting device.

8 is an exploded perspective view schematically showing a lighting device using the optical plate proposed in the present invention. The lighting device 100 according to the present embodiment includes a housing 101 and a light source 102 therein. A light emitting diode (LED) may be used as the light source 102, and may be mounted on the circuit board 104 and used. On the traveling path of the light emitted from the light source 102, an optical plate 103 capable of performing a cutoff function and a light diffusing function is disposed. The optical plate 103 is disposed so that the surface on which the uneven structure is not formed faces the light source 102. Although not specifically illustrated, the optical plate 103 has the uneven structure formed on one surface of the light transmissive substrate, and the uneven structure And a fine pattern is formed on one surface between the uneven structure and light may be scattered. As described above, in the case of the lighting device 100, the glare is reduced by the uneven structure of the optical plate 103, so that comfortable lighting can be realized. Furthermore, by applying a fine pattern having a smaller size than the uneven structure, the overall structure is applied. Uniform light can be obtained.

The present invention is not limited by the above-described embodiments and the accompanying drawings, but is defined by the appended claims. Accordingly, it will be apparent to one of ordinary skill in the art that various forms of substitution, modification, and alteration are possible without departing from the spirit of the present invention as set forth in the claims, and also appended claims It belongs to the technical idea described in the range.

1 is a cross-sectional view showing a conventional lighting device using a diffusion plate, Figure 2 shows a light distribution curve obtained when using the lighting device of FIG.

3 and 4 show an optical plate according to an embodiment of the present invention, and correspond to a perspective view and a cross-sectional view, respectively.

FIG. 5 schematically shows a path and intensity distribution of light that may be obtained when the optical plate proposed in the present invention is used in an illumination device, and FIG. 6 shows a light distribution curve.

FIG. 7 schematically illustrates paths and path distributions of light that may be obtained when an optical plate to which a fine pattern is not applied is used as an example for comparison with an embodiment of the present invention.

8 is an exploded perspective view schematically showing a lighting device using the optical plate proposed in the present invention.

Description of the Related Art

101: housing 102: light source

103: optical plate 103a: uneven structure

103b: fine pattern 103c: translucent substrate

104: circuit board

Claims (16)

Light source; And An optical plate disposed on a path of light emitted from the light source and having an uneven structure for controlling an angle of emission of the light emitted from the light source, and formed in a region between the uneven structure and smaller than the uneven structure to have the fine pattern; ; Lighting device comprising a. The method of claim 1, And the optical plate is disposed such that the surface opposite to the surface on which the uneven structure is formed faces the light source. The method of claim 1, And the optical plate has a flat surface opposite to the surface on which the uneven structure is formed. The method of claim 1, The uneven structure has a prism shape. The method of claim 1, The uneven structure has a conical or polygonal pyramid shape, characterized in that the lighting device. The method of claim 5, Illumination device, characterized in that the vertex angle in the cone or polygonal pyramid is 100 ~ 140 °. The method of claim 5, The ratio of the area of the bottom surface of the uneven structure and the area of the region where the fine pattern is formed is 9: 1 to 6: 4. The method of claim 1, And the optical plate is made of one material selected from the group consisting of polycarbonate, acrylic, polystyrene and polyethylene terephthalate. The method of claim 1, And the light source is a plurality of light emitting diodes. The method of claim 1, And a housing accommodating the light source therein. A translucent substrate having first and second faces opposing each other; Uneven structures spaced apart from each other such that at least a portion of the first surface is exposed on the first surface of the light transmissive substrate; And A fine pattern having a size smaller than that of the uneven structure in a region exposed between the uneven structures of the first surface; Optical plate comprising a. The method of claim 11, And the translucent substrate and the concave-convex structure are made of the same material. The method of claim 11, And said uneven structure has a prism shape. The method of claim 11, The uneven structure is an optical plate, characterized in that having a conical or polygonal shape. The method of claim 14, The vertex angle in the cone or polygonal pyramid is characterized in that the 100 ~ 140 °. The method of claim 13, The ratio of the area of the bottom surface of the uneven structure to the area of the region where the fine pattern is formed is 9: 1 to 6: 4.
KR1020090117070A 2009-11-30 2009-11-30 Lighting device and optical plate KR20110060473A (en)

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KR20110060473A true KR20110060473A (en) 2011-06-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021235774A1 (en) * 2020-05-20 2021-11-25 엘지이노텍 주식회사 Lighting module, lighting device and taillight

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021235774A1 (en) * 2020-05-20 2021-11-25 엘지이노텍 주식회사 Lighting module, lighting device and taillight
US11976801B2 (en) 2020-05-20 2024-05-07 Lg Innotek Co., Ltd. Lighting module, lighting device and taillight

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