KR101233199B1 - Light pipe with structured inside and outside surface - Google Patents

Light pipe with structured inside and outside surface Download PDF

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Publication number
KR101233199B1
KR101233199B1 KR1020060033586A KR20060033586A KR101233199B1 KR 101233199 B1 KR101233199 B1 KR 101233199B1 KR 1020060033586 A KR1020060033586 A KR 1020060033586A KR 20060033586 A KR20060033586 A KR 20060033586A KR 101233199 B1 KR101233199 B1 KR 101233199B1
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KR
South Korea
Prior art keywords
light pipe
light
outer surface
inner surface
plurality
Prior art date
Application number
KR1020060033586A
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Korean (ko)
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KR20070102006A (en
Inventor
이상훈
Original Assignee
엘지전자 주식회사
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Priority to KR1020060033586A priority Critical patent/KR101233199B1/en
Priority claimed from US11/636,553 external-priority patent/US7658514B2/en
Publication of KR20070102006A publication Critical patent/KR20070102006A/en
Application granted granted Critical
Publication of KR101233199B1 publication Critical patent/KR101233199B1/en

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Abstract

The present invention is a hollow structure in which both the outer surface and the inner surface are structured to transmit light with relatively low transmission loss by total internal reflection on the one hand and to emit light being transmitted to the outside by an emission method such as reflection or refraction. Relates to a light pipe. According to one embodiment of the present invention, a hollow light pipe for transmitting and distributing light extends in a direction substantially the same as the longitudinal direction of the light pipe, and has an outer surface structured with a plurality of linear structures arranged side by side and A surface facing the outer surface, each extending in a direction substantially the same as the longitudinal direction of the light pipe, and includes an inner surface structured by a plurality of linear structures arranged side by side.
Light pipe, optical writing film, light guide

Description

LIGHT PIPE WITH STRUCTURED INSIDE AND OUTSIDE SURFACE}

1A is a cross-sectional view of a portion of an optical writing film to illustrate the transmission and reflection of light in a light pipe.

1B is a perspective view of a portion of an optical writing film to illustrate the transmission and reflection of light in the light pipe.

FIG. 1C is a cross-sectional view of a portion of a light pipe for explaining an aspect in which light is emitted to the outside of the light pipe.

2A is a perspective view of a light pipe according to an embodiment of the present invention.

FIG. 2B is a cross-sectional view of the light pipe for explaining the shape of the outer surface and the inner surface of the light pipe of FIG. 2A.

3A to 3C are cross-sectional views showing other embodiments of the light pipe of the present invention.

4A to 4D are cross-sectional views showing still other embodiments of the light pipe of the present invention.

FIELD OF THE INVENTION The present invention generally relates to light pipes for transmitting and distributing light, and more particularly, the present invention transmits light on the one hand with relatively low transmission losses by total internal reflection, and on the other hand The present invention relates to a hollow light pipe in which both an outer surface and an inner surface are structured to emit outgoing light to the outside by an emission method such as reflection or refraction.

In general, a light pipe is an optical member used to transmit light emitted from a light source to a relatively small transmission loss to a distance, also called a light conduit, a light guide or a light tube. Light pipes can also be used to effectively distribute decorative or functional light over a relatively large area.

Conventional light pipe structures consist of a transparent polymeric material and comprise a tubular wall having an outer surface structured with a fine structure and an unstructured smooth inner surface opposite thereto. The unstructured inner surface is substantially planar, while the structured outer surfaces comprise a linear prism arrangement arranged side by side to form a plurality of triangular grooves extending in the longitudinal direction of the light pipe. Due to such a structural feature, the light pipe transmits light along the length direction of the light pipe by restricting the light inputted into the light pipe within the predetermined angle range by the total internal reflection inside the light pipe. Typical light pipes as described above are disclosed in US Pat. No. 4,805,984, which is incorporated herein by reference.

On the other hand, a light pipe is used not only for the purpose of point lighting for illuminating a specific point, but also for illuminating an area. Conventionally, various techniques have been used to distribute light traveling inside the light pipe to the outside. In one technique of this technique, light is changed by changing the shape of the prism disposed on the structured surface, that is, by rounding the corners of the prism, by wearing part of the prism, or by completely removing the prism of the selected area. Techniques to allow release through the altered region of.

Also, as another technique, a technique of disposing a light extractor in a light pipe is included. Such light emitters have a material in the form of strips or sheets shaped to reflect light towards the light pipe at an angle outside the angular range of total internal reflection.

However, when light is reflected in this manner, the total reflectance of the light pipe is reduced, thereby allowing light to be emitted through the walls of the light pipe, thus providing decorative or functional lighting.

Light pipes are typically manufactured using an optical lighting film (OLF). Typical optical writing films are made of a relatively thin sheet-like transparent material, for example acrylic or polycarbonate, having a linear prism arrangement embossed on one side or vice versa. Since the sheet-like material is sufficiently flexible, it is possible to roll the optical writing film to produce a tubular light pipe. Suitable optical writing films for light pipe manufacture are disclosed in US Pat. Nos. 4,906,070 and 5,056,892, which are incorporated herein by reference in their entirety.

Hereinafter, the light transmission and reflection principle of the light pipe having the structure as described above will be described with reference to the accompanying drawings within the scope necessary for understanding of the present invention.

FIG. 1A is a cross sectional view showing a portion of an optical lighting film to explain the transmission and reflection of light in the light pipe, and FIG. 1B shows a portion of the optical lighting film to illustrate the transmission and reflection of light in the light pipe. One perspective view. However, for ease of understanding, the structured outer surface is shown as the upper side and the structured outer surface is shown as the lower side.

First, referring to FIGS. 1A and 1B, light from a light source (not shown) is incident and refracted by an unstructured inner surface of the optical writing film as an arrow (one point), and on both sides of the structured outer prism The light is totally reflected (2 and 3 points), whereby the light directed outward is refracted at the inner surface (4 points) and input back into the inside. When the total reflection process is repeated, the light proceeds substantially along the longitudinal direction of the light pipe, and almost no loss of light occurs in the air inside the light pipe. Thus, light can be transmitted through the light pipe at almost short distance as well as at a short distance.

On the other hand, Figure 1c is a cross-sectional view of a portion of the light pipe for explaining the light emission to the outside of the light pipe.

Referring to FIG. 1C, the light pipe 10 includes an optical writing film 11 and a light emitter 12. The light emitter 12 is made of a material capable of reflecting light and is disposed in a portion of the unstructured inner surface of the optical writing film 11.

Light emitted from the light source (not shown) is incident on the optical writing film 11 and is transmitted in the longitudinal direction of the light pipe 10 by the principle described with reference to FIGS. 1A and 1B. On the other hand, when the light traveling in the inside of the light pipe 10 is reflected from the surface of the light emitter 12 attached to the inner surface of the optical writing film 11 is emitted to the outside while the transmission angle of the light is changed.

However, conventionally, the optical writing film 11 used for the light pipe is structured on one side, and the inner surface opposite to the surface is an unstructured flat film, and the flat film is accommodated inside the cylindrical transparent acrylic housing. It is shaped into a cylindrical shape. Through this process, the optical writing film 11 is adhered to both edges or overlapped by an adhesive means. As a result, the adhesion of this optical writing film 11 results in the transmission loss and breaking effect of light at the bonding site.

In addition, in the case where the optical lighting film 11 as described above is attached to the light pipe 10 and used, the manufacturing cost of the optical lighting film 11 itself is high, thereby increasing the overall manufacturing cost of the light pipe 10. It became a factor.

In addition, the light pipe 10 made of the optical writing film 11 may be operated separately for the emission of light reflection or refraction, for example, installation of a light emitter, cutting of a corner of a prism, complete removal of a selected prism, etc. Manipulations were to be parallel.

Therefore, there is still a need for the development of a light pipe having a structure capable of uniformly transmitting and emitting light to a long distance without the complicated operation described above.

The present invention is to solve the problems of the prior art as described above, it is an object of the present invention to provide a light pipe structure that can emit a uniform light by efficiently controlling the transmission and emission of light.

In order to achieve the object of the present invention as described above, the light pipe according to the present invention is a hollow light pipe for transmitting and distributing light, extending in a direction substantially the same as the longitudinal direction of the light pipe, arranged side by side An outer surface structured into a plurality of linear structures. In addition, the light pipe is a surface facing the outer surface, each extending in a direction substantially the same as the longitudinal direction of the light pipe, and includes an inner surface structured with a plurality of linear structures arranged side by side.

Here, the cross-sectional shape of the linear structure of the outer surface of the light pipe and the linear structure of the inner surface may be substantially the same, and the cross-sectional shapes of the linear structure of the outer surface and the linear structure of the outer surface may be right angled isosceles triangles.

In addition, the cross-sectional shape of the linear structure of the outer surface and the linear structure of the inner surface of the light pipe may be different from each other, the cross-sectional shape of the linear structure of the outer surface is trapezoidal, the cross-sectional shape of the linear structure of the inner surface is a right isosceles triangle Can be.

In addition, the cross-sectional shape of the light pipe of the present invention may be circular, elliptical or polygonal.

The light pipe of the present invention has a structure in which both surfaces, that is, the inner and outer surfaces of the light pipe are structured, and not only transmit light uniformly from the light source, but also to the outside of the light pipe without the help of a separate member such as a light emitter. It can emit light uniformly.

In addition, unlike conventional light pipes manufactured by rounding an optical lighting film having a flat plate shape, the production cost may be reduced and continuously manufactured by an extrusion molding method, and the structure of the light pipe may be simpler than in the related art.

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

FIG. 2A is a perspective view of a light pipe according to an embodiment of the present invention, and FIG. 2B is a cross-sectional view of the light pipe for explaining the shape of the outer surface and the inner surface of the light pipe of FIG. 2A.

2A and 2B, a light pipe 20 according to an embodiment of the present invention is filled with a transparent medium, for example, air, and the hollow (hollow) light having a substantially circular cross section. It is a waveguide. The light pipe 20 has a structure suitable for transmitting light input through a light source (not shown) disposed on one or both sides thereof in the longitudinal direction thereof.

The light pipe 20 comprises an outer surface 22 comprising a plurality of structures 23 whose cross section extends in a direction substantially the same as the longitudinal direction of the light pipe, having a substantially isosceles triangle shape.

In this case, the structures 23 are arranged side by side on the outer surface 22 of the light pipe 20.

In addition, the light pipe 20 includes an inner surface 24 opposite the outer surface 22, the inner surface of which has a shape of an isosceles triangle whose cross section extends in substantially the same direction as the longitudinal direction of the light pipe 20. A plurality of structures 25 are included.

At this time, the structures 25 are arranged in parallel with each other on the inner surface of the light pipe 20.

The structure in which both the inner surface 24 and the outer surface 22 of the light pipe 20 are structured is a feature of the present invention that is different from the conventional light pipe in which the inner surface is smooth and only the outer surface is structured.

A triangular groove is disposed between the structures 23 arranged on the outer surface 22 of the light pipe 20, and likewise, of the structures 24 arranged on the inner surface 24 of the light pipe 20. Triangular grooves are arranged between them.

In addition, the groove is located on the inner surface 24 corresponding to the portion where the structure 23 of the outer surface 22 is located, and the structure 25 is positioned on the inner surface 24 corresponding to the portion where the groove of the outer surface 22 is located. do.

The light pipe 20 may be made of a material having excellent light transmission, mechanical and thermal stability, for example, polycarbonate, polymethyl methacrylate, acrylic, polypropylene, polystyrene, polyvinyl chloride. Preferably, the light pipe 20 is made of polycarbonate or polymethyl methacrylate.

The light pipe 20 having the structure as described above, unlike the conventional light pipe using the optical writing film, by extrusion molding through a pre-processed extrusion mold in the longitudinal direction can be produced integrally without any additional operation. .

Hereinafter, transmission and distribution of light generated in the light pipe 20 having the above-described structure will be described. As used herein, the term "incident angle" refers to the angle formed with the normal of this boundary when light traveling through the medium reaches the interface with another medium.

First, if the light input into the light pipe 20 has an incident angle equal to or greater than a predetermined critical angle θ c by the ratio of the refractive index between the light pipe 20 and the medium surrounding the light pipe, The light is reflected by the total reflection condition according to the well-known Snell's Law, whereby the light traveling to the outside of the light pipe 20 is again confined to the inside of the light pipe 20 and substantially light pipe ( Proceed in the longitudinal direction of 20). At this time, since the medium filling the inside of the light pipe 20 is air, light may be guided inside the light pipe 20 with little loss.

Meanwhile, light incident at an angle of incidence below the critical angle θ c is emitted directly through the outer surface of the light pipe 20. In this way, the light input into the light pipe 20 is transmitted in the longitudinal direction of the light pipe 20 and is discharged to the outside thereof.

The technical spirit of the present invention is not limited to the structure of the light pipe 20 according to the embodiment of the present invention described above, and may be variously modified by those skilled in the art. Hereinafter, various modifications to the light pipe 20 will be described.

3A to 3C are cross-sectional views showing other embodiments of the light pipe of the present invention.

Referring to FIG. 3A, the light pipe 30 includes an outer surface 32 including a plurality of structures 33 whose cross section extends in substantially the same direction as the longitudinal direction of the light pipe and has a substantially isosceles triangle shape. do.

At this time, the structures 33 are arranged side by side on the outer surface 32 of the light pipe 30.

In addition, the light pipe 30 includes an inner surface 34 facing the outer surface 32, the inner surface of which has a shape of an isosceles triangle whose cross section extends in substantially the same direction as the longitudinal direction of the light pipe 30. A plurality of structures 35 are included.

At this time, the structures 35 are arranged in parallel with each other on the inner surface of the light pipe 30.

The structure in which both the inner surface 34 and the outer surface 32 of the light pipe 30 are structured is a feature of the present invention that is different from the conventional light pipe in which the inner surface is smooth and only the outer surface is structured.

As in the above-described embodiment, triangular grooves are disposed between the structures 33 disposed on the outer surface 32 of the light pipe 30, and likewise, disposed on the inner surface 34 of the light pipe 30. A triangular groove is also disposed between the structures 35.

However, unlike the above-described embodiment, the structure 35 is located on the inner surface 34 corresponding to the portion where the structure 33 of the outer surface 32 is located, and the inner surface corresponding to the portion where the groove of the outer surface 32 is located. A groove is located at 34.

The light pipe 30 may be made of a material excellent in light transmittance, mechanical and thermal stability, for example, polycarbonate, polymethyl methacrylate, acrylic, polypropylene, polystyrene, polyvinyl chloride. Preferably, the light pipe 30 is made of polycarbonate or polymethyl methacrylate. This is the same as described in the above-described embodiment, and may be applied to other embodiments below as well.

On the other hand, the light pipe 30 having the structure as described above can be manufactured integrally without any additional manipulation by extrusion molding through the extrusion mold pre-processed in the longitudinal direction as described in the above embodiment.

Referring to FIG. 3B, the light pipe 40 includes an outer surface 42 including a plurality of structures 43 having a substantially trapezoidal cross section extending in a direction substantially the same as the length direction of the light pipe.

At this time, the structures 43 are arranged side by side on the outer surface 42 of the light pipe 40.

In addition, the light pipe 40 includes an inner surface 44 opposite the outer surface 42, the inner surface of which has an isosceles triangular cross section extending in a direction substantially the same as the longitudinal direction of the light pipe 40. It includes a number of structures 45.

At this time, the structures 45 are arranged side by side on the inner surface of the light pipe 40.

The structure in which both the inner surface 44 and the outer surface 42 of the light pipe 40 are structured is a feature of the present invention that is different from the conventional light pipe in which the inner surface is smooth and only the outer surface is structured.

A triangular groove is disposed between the structures 43 arranged on the outer surface 42 of the light pipe 40, and likewise, of the structures 45 arranged on the inner surface 44 of the light pipe 40. Triangular grooves are arranged between them.

In addition, the groove is located on the inner surface 44 corresponding to the portion where the structure 43 of the outer surface 42 is located, and the structure 45 is located on the inner surface 44 corresponding to the portion where the groove of the outer surface 42 is located. do.

Referring to FIG. 3C, the light pipe 50 includes an outer surface 52 including a plurality of structures 53 having a substantially trapezoidal cross section extending in a direction substantially the same as the length direction of the light pipe.

At this time, the structures 53 are arranged side by side on the outer surface 52 of the light pipe 50.

In addition, the light pipe 50 includes an inner surface 54 opposite to the outer surface 52, the inner surface of which has a shape of an isosceles triangle whose cross section extends in substantially the same direction as the longitudinal direction of the light pipe 50. A plurality of structures 55 are included.

At this time, the structures 55 are arranged side by side on the inner surface 54 of the light pipe 50.

The structure in which both the inner surface 54 and the outer surface 52 of the light pipe 50 are structured is a feature of the present invention that is different from the conventional light pipe in which the inner surface is smooth and only the outer surface is structured.

As in the above-described embodiment, a triangular groove is disposed between the structures 53 disposed on the outer surface 52 of the light pipe 50, and the structure disposed on the inner surface 54 of the light pipe 50. A triangular groove is arranged between the fields 55.

However, the structure 55 is located on the inner surface 54 corresponding to the portion where the structure 53 of the outer surface 52 is located, and the groove is located on the inner surface 54 corresponding to the portion where the groove of the outer surface 52 is located. do.

Various other modifications will be possible in addition to the above embodiments, which will be briefly described below with reference to the drawings.

4A to 4D are cross-sectional views showing still other embodiments of the light pipe of the present invention.

Referring to FIG. 4A, the light pipe 60 includes an outer surface 62 including a plurality of structures 63 having a substantially triangular cross section extending in a direction substantially the same as the length direction of the light pipe, The cross section extending in a direction substantially the same as the longitudinal direction of the pipe 60 may include an inner surface 64 comprising a plurality of grooves 65 having a trapezoidal shape. At this time, the groove 65 is located on the inner surface 64 corresponding to the portion where the structure 63 of the outer surface 62 is located.

Referring to FIG. 4B, the light pipe 70 may include an outer surface 72 including a plurality of structures 73 having a substantially triangular cross section extending in a direction substantially the same as the length direction of the light pipe, A cross section extending in a direction substantially the same as the longitudinal direction of the pipe 70 may include an inner surface 74 including a plurality of grooves 75 having a trapezoidal shape. At this time, the groove 75 is located on the inner surface 74 corresponding to the groove disposed between the structures 73 of the outer surface 72.

Referring to FIG. 4C, the light pipe 80 includes an outer surface 82 including a plurality of structures 83 having a substantially trapezoidal cross section extending in a direction substantially the same as the length direction of the light pipe, and the light pipe. A cross section extending in a direction substantially the same as the longitudinal direction of 80 may include an inner surface 84 including a plurality of grooves 85 having a trapezoidal shape. At this time, the groove 85 is located on the inner surface 84 corresponding to the portion where the structure 83 of the outer surface 82 is located.

Referring to FIG. 4D, the light pipe 90 includes an outer surface 92 including a plurality of structures 93 having a substantially trapezoidal shape in cross section extending in a direction substantially the same as the length direction of the light pipe, and a light pipe. A cross section extending in a direction substantially the same as the longitudinal direction of 90 may include an inner surface 94 including a plurality of grooves 95 having a trapezoidal shape. At this time, the groove 85 is located on the inner surface 84 corresponding to the groove disposed between the structures 93 of the outer surface 92.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And additions should be considered as falling within the scope of the following claims.

Unlike the conventional light pipe using the optical writing film, the light pipe according to the present invention has the advantage that it can be produced integrally without any additional manipulation by extrusion molding through a pre-processed extrusion mold in the longitudinal direction.

In addition, the manufacturing cost can be reduced because there is no need for a separate operation, for example, installation of a light emitter, cutting of a corner of a prism, or a complete removal of a selected prism, for emission of light reflection or refraction. have.

Claims (6)

  1. In a hollow light pipe for transmitting and distributing light,
    An outer surface extending in the same direction as the longitudinal direction of the light pipe and having a plurality of linear structures arranged side by side; And
    A surface facing the outer surface, each of which extends in the same direction as the longitudinal direction of the light pipe and includes an inner surface structured by a plurality of linear structures arranged side by side;
    The plurality of linear structures on the outer surface and the plurality of linear structures on the inner surface are integrally formed with the light pipe,
    The shape of the cross-section of the linear structure of the outer surface and the linear structure of the inner surface is the same as a triangle,
    The light pipe is formed at a position where the linear structure of the outer surface and the linear structure of the inner surface corresponding to each other.
  2. delete
  3. The method of claim 1,
    Light pipes, characterized in that the cross-sectional shape of the linear structure of the outer surface and the linear structure of the inner surface are all rectangular isosceles triangles.
  4. In a hollow light pipe for transmitting and distributing light,
    An outer surface extending in the same direction as the longitudinal direction of the light pipe and having a plurality of linear structures arranged side by side to form a groove therebetween; And
    A surface facing the outer surface, each of which extends in the same direction as the longitudinal direction of the light pipe and includes an inner surface structured by a plurality of linear structures arranged side by side such that grooves are formed therebetween;
    The plurality of linear structures on the outer surface and the plurality of linear structures on the inner surface are integrally formed with the light pipe,
    The shape of the cross-section of the linear structure of the outer surface and the linear structure of the inner surface is the same as a triangle,
    And the groove between the linear structure of the outer surface and the linear structure of the inner surface is formed at a position corresponding to each other, and the groove between the linear structure of the outer surface and the linear structure of the inner surface is formed at a position corresponding to each other.
  5. 5. The method of claim 4,
    Light pipes, characterized in that the cross-sectional shape of the linear structure of the outer surface and the linear structure of the inner surface are all rectangular isosceles triangles.
  6. delete
KR1020060033586A 2006-04-13 2006-04-13 Light pipe with structured inside and outside surface KR101233199B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020060033586A KR101233199B1 (en) 2006-04-13 2006-04-13 Light pipe with structured inside and outside surface

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR1020060033586A KR101233199B1 (en) 2006-04-13 2006-04-13 Light pipe with structured inside and outside surface
US11/636,553 US7658514B2 (en) 2006-04-13 2006-12-11 Light guide, method and apparatus for manufacturing the same, and illuminating system having the same
EP06025723.5A EP1845304B1 (en) 2006-04-13 2006-12-12 Light guide, method and apparatus for manufacturing the same, and illuminating system having the same
CN 200610168507 CN101055061B (en) 2006-04-13 2006-12-14 Light guide, method and apparatus for manufacturing the same, and illuminating system having the same
CA002571929A CA2571929C (en) 2006-04-13 2006-12-20 Light guide, method and apparatus for manufacturing the same, and illuminating system having the same
JP2006345544A JP2007287657A (en) 2006-04-13 2006-12-22 Lighting system using light guide

Publications (2)

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KR20070102006A KR20070102006A (en) 2007-10-18
KR101233199B1 true KR101233199B1 (en) 2013-02-15

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5511798B2 (en) * 2008-05-30 2014-06-04 コーニンクレッカ フィリップス エヌ ヴェ Lighting device with light guide
TWI452230B (en) * 2012-04-12 2014-09-11 Chien Hsiang Lai Manufacturing method for lamp shade of led lamp and manufacturing device thereof
SG11201604909YA (en) * 2013-12-19 2016-07-28 3M Innovative Properties Co Modular distribution system

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JPH06235918A (en) * 1993-02-09 1994-08-23 Chiyatani Sangyo Kk Light guide device
US6154595A (en) * 1997-07-14 2000-11-28 Matsushita Electric Works, Ltd. Side-face illuminating optical fiber
JP2002237203A (en) 2001-02-09 2002-08-23 Japan Storage Battery Co Ltd Luminaire
KR20020084191A (en) * 2000-03-16 2002-11-04 쓰리엠 이노베이티브 프로퍼티즈 캄파니 Illumination device

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US5258896A (en) 1992-06-04 1993-11-02 Minnesota Mining And Manufacturing Company Line light source
US5475785A (en) 1993-04-30 1995-12-12 Johanson; Walter A. Illumination devices and methods of forming same
US5481637A (en) 1994-11-02 1996-01-02 The University Of British Columbia Hollow light guide for diffuse light
US6621973B1 (en) 2000-03-16 2003-09-16 3M Innovative Properties Company Light guide with protective outer sleeve
KR100813703B1 (en) * 2000-03-16 2008-03-13 쓰리엠 이노베이티브 프로퍼티즈 캄파니 Illumination device
CN2480686Y (en) 2001-04-16 2002-03-06 国乔光技股份有限公司 Improvement for light-guide pipe

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Publication number Priority date Publication date Assignee Title
JPH06235918A (en) * 1993-02-09 1994-08-23 Chiyatani Sangyo Kk Light guide device
US6154595A (en) * 1997-07-14 2000-11-28 Matsushita Electric Works, Ltd. Side-face illuminating optical fiber
KR20020084191A (en) * 2000-03-16 2002-11-04 쓰리엠 이노베이티브 프로퍼티즈 캄파니 Illumination device
JP2002237203A (en) 2001-02-09 2002-08-23 Japan Storage Battery Co Ltd Luminaire

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CN101055061B (en) 2010-05-26
CN101055061A (en) 2007-10-17

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