WO2011134164A1 - 微棱镜导光板及其制造方法、及其制成的片灯、片灯具 - Google Patents

微棱镜导光板及其制造方法、及其制成的片灯、片灯具 Download PDF

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Publication number
WO2011134164A1
WO2011134164A1 PCT/CN2010/072352 CN2010072352W WO2011134164A1 WO 2011134164 A1 WO2011134164 A1 WO 2011134164A1 CN 2010072352 W CN2010072352 W CN 2010072352W WO 2011134164 A1 WO2011134164 A1 WO 2011134164A1
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WO
WIPO (PCT)
Prior art keywords
prism
guide plate
light guide
light
strip
Prior art date
Application number
PCT/CN2010/072352
Other languages
English (en)
French (fr)
Inventor
潘定国
Original Assignee
Pan Dingguo
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 Pan Dingguo filed Critical Pan Dingguo
Priority to US13/695,350 priority Critical patent/US8956035B2/en
Priority to PCT/CN2010/072352 priority patent/WO2011134164A1/zh
Priority to CN201080063913.8A priority patent/CN102859272B/zh
Publication of WO2011134164A1 publication Critical patent/WO2011134164A1/zh

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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
    • F21S8/03—Lighting devices intended for fixed installation of surface-mounted type
    • F21S8/033—Lighting devices intended for fixed installation of surface-mounted type the surface being a wall or like vertical structure, e.g. building facade
    • 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width 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
    • G02B6/0045—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 by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals
    • 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]

Definitions

  • the present invention relates to a microprism type light guide plate, and more particularly to a triangular prism light guide plate with a variable angle critical edge and a method of manufacturing the same, and various shapes of sheet lamps and sheet lamps made therefrom. Background technique
  • the micro-column prism body 111 has a triangular cross section in each of the micro-column prism bodies 111, wherein the plurality of triangles are continuously distributed in a zigzag shape and have the same cross-sectional shape, and two left and right triangles adjacent to the symmetrical central plane
  • the vertical distance of the vertex from the smooth plane 12 of the light guide plate is the shortest, and the vertical distance from the vertex of the left and right sides to the smooth surface of the light guide plate gradually increases, and the distances of the vertices of the respective triangles in the horizontal direction are equal, each being ⁇ .
  • the entire triangular prism body has a length of ⁇ ⁇ 2 ⁇ , where ⁇ is the number of triangular prism bodies on one side of the symmetrical central plane.
  • ⁇ is the number of triangular prism bodies on one side of the symmetrical central plane.
  • the vertices of the triangles of the near smooth plane 12 can be connected, and the vertices of the adjacent triangles away from the smooth plane 12 can be connected. Taking the left half of the center plane as an example, two planes of two straight lines or lines are obtained. The two straight lines (two planes) are slanted but parallel to each other.
  • the two straight lines respectively intersect the central axis of the cross section of the light guide plate at the ⁇ and ⁇ points, which are AN and HM, and they form an angle a, a and less than 45 degrees, preferably less than 10 degrees, with the smooth plane 12 of the light guide plate.
  • the light guide plate 1 is provided with elongated flanges on the outermost two triangular prisms on both sides of the center plane to form the lamp sockets 14, 14' for accommodating the plurality of lamp bodies 2.
  • the lamp body 2 is a light emitting diode LED, a bulb, an electrode tube or a plurality of LED tube assemblies.
  • the lamp body 2 is a prefabricated elongated lamp assembly comprising a plurality of LED patches 21 and a circuit board 22, and the lamp assembly is directly placed in the lamp slots 14, 14' to enable the lamp
  • the emitting plane of the LED patch 21 in the slot is in close contact with the inner wall of the lamp slot and intersects with the surface of the triangular vertices of the cross-section of the light guide plate at an angle of 90- ⁇ to make the light of the LED patch 21
  • Each of the two ends of the light guide plate may be directed to an equal-section right-angled triangular prism body on either side bounded by the center plane.
  • the above-mentioned light-emitting diodes and LED patches are low-power tubes, and a plurality of chips can be disposed in one LED patch.
  • the sheet lamp also optionally includes a bezel 3 and a reflective liner 5.
  • the bezel 3 may include a heat dissipating strip 31 and upper and lower headers 32 which are connected to form a rectangular frame.
  • the two heat strips 31 are made of a metal heat conductive material such as an aluminum alloy or a copper alloy material, and the two heads 32 are made of a transparent plastic of plexiglass, polycarbonate or polymethyl acrylate.
  • the reflective lining 5 is a sheet of material that is placed above the light guide plate 1.
  • the reflective lining 5 may be made of plastic, paper or a metal material such as an aluminum alloy, a copper alloy or the like.
  • the leaf light can also include two terminals 29.
  • Fig. 3 shows a sheet lamp made of the above-mentioned sheet lamp.
  • the luminaire further includes a bottom frame 4 and a constant current source 7.
  • the bottom frame 4 is a rectangular frame made of a metal material.
  • the constant current source ⁇ of the lamp body 2 is mounted on the bottom frame 4 through a connector, and its output terminal is connected to the terminal 29 via a wire, and the input terminal can be connected to the power source through the power socket.
  • Figures 4-6 illustrate an isometrically disposed equi-section triangular oriented prism light guide, sheet lamp, and sheet fixture, respectively.
  • the specific structure is similar to the symmetrically disposed equilateral triangular prismatic prism light guide plate, sheet lamp, and sheet lamp shown in Figs. 1-3, and thus a detailed description thereof will be omitted.
  • Figure 7-9 shows an equal-section triangular-oriented prismatic light guide plate, a circular plate lamp, and a circular plate lamp, respectively.
  • the specific structure is similar to the symmetrically disposed equilateral triangular prismatic prism light guide plate, sheet lamp, and sheet lamp shown in Figs. 1-3, and thus a detailed description thereof will be omitted.
  • An object of the present invention is to provide a triangular microprism light guide plate having excellent brightness and uniformity of emitted light, a method of manufacturing the same, and a sheet lamp and a sheet lamp manufactured therefrom.
  • the present invention provides an asymmetric triangular prism light guide plate comprising: a smooth plane; and a prism surface on which a plurality of parallel strip-shaped microcolumn prism bodies are disposed.
  • the cross section of each microcolumn prism body is a triangle, and the vertices of the triangles from left to right or from right to left are said to be
  • the distance of the smooth plane gradually increases, and the line connecting the vertices is a straight line, and the angle ⁇ formed by the straight line with the smooth plane is less than 45 degrees, and a strip light source is disposed outside the microcolumn prism which is the farthest from the smooth plane of the triangle vertex.
  • a side of the cross-section triangle of each micro-pillar prism body that is far from the strip-shaped light source and receives light emitted by the strip-shaped light source is called a light-receiving critical edge
  • the light-receiving critical edge and the normal of the smooth plane form a critical angle.
  • the critical angle ranges from 40 degrees to 90 degrees, and the critical angle is gradually increased from the microcolumn prism body whose triangle vertex is closest to the smooth plane to the microcolumn prism body whose triangle vertex is farthest from the smooth plane.
  • the invention also provides a symmetrical triangular prismatic prism light guide plate, comprising: a smooth plane; and a prism surface, wherein a plurality of parallel strip-shaped microcolumn prism bodies are symmetrically arranged on the prism surface, each micro The cross section of the prism body is a triangle, and the distance from the symmetry center to the left and right sides of the triangle vertex is gradually increased from the smooth plane, and the line connecting the vertices of each triangle is two inclined straight lines, and the straight line is the smooth plane
  • the angle ⁇ formed by each is less than 45 degrees, and two strip-shaped light sources are disposed outside the two micro-column prisms whose vertices are farthest from the smooth plane, and the cross-section triangles of each micro-column prism are far away from the strip-shaped light source.
  • the critical angle of the microcolumn prism body on the left and right sides gradually increases.
  • the invention also provides a triangular microprism circular light guide plate, comprising: a smooth plane; and a prism surface, wherein a plurality of concentric annular microcolumn prisms are arranged on a radial direction of the prism surface from the central axis Body, a vertical cross section through the central axis, each annular microcolumn prism body has a triangular cross section, and a radius of the triangular cross section of the annular microcolumn prism body from the central axis toward the left and right sides is away from the smooth surface
  • the distance gradually increases, and the radial connection of the apex of the cross-section triangle of each annular micro-column prism body is two oblique straight lines, and the angle ⁇ formed by the straight line with the smooth surface is less than 45 degrees, and the apex of the triangle is at a smooth plane
  • the farthest annular microcolumn prism is provided with an annular strip-shaped light source, and the side
  • the critical edge of the light receiving and the normal of the smooth plane form a critical angle
  • the critical angle ranges from 40 degrees to 90 degrees, and from the central axis to the left and right
  • the periphery of the annular body, the column-side microprism critical angle gradually increasing.
  • an angle formed by the other side of the cross-sectional triangle of each micro-pillar prism with respect to the light-receiving critical edge and the normal line of the smooth plane ranges from 0 to 40 degrees.
  • the angle formed by the other side of the cross-sectional triangle of each micro-pillar prism with respect to the critical edge of the light receiving light and the normal line of the smooth plane is 0 degree.
  • the prism surface has n prisms, and the n prisms are divided into m groups, and the critical angle of the micro column prism body is gradually increased in steps according to each group, wherein m is greater than or equal to 3 .
  • the angle ⁇ formed by the straight line and the smooth surface is less than 10 degrees.
  • an elongated flange is provided outside the microcolumn prism which is the farthest from the smooth plane of the apex of the triangle to form a lamp groove for accommodating the strip light source.
  • the distances of the respective cross-section triangles in the longitudinal direction are equal, and the length direction is parallel to the smooth plane.
  • the light guide plate is made of a transparent plastic of polycarbonate or polymethyl acrylate.
  • the present invention also provides a sheet lamp comprising: the above-mentioned light guide plate, wherein a long-shaped flange is provided outside the micro-column prism which is farthest from the smooth plane of the triangular vertex to form the strip shape a light groove of the light source; and a strip light source mounted in the light groove.
  • the strip light source is a prefabricated elongated lamp assembly composed of a plurality of light emitting diode patches and a circuit board, and the strip light emitting plane is tight with the inner wall of the lamp socket Pasted and parallel to the smooth plane of the light guide plate.
  • the light-emitting diode in the LED chip is a low-power tube, and a plurality of light-emitting diodes can be disposed in one LED chip.
  • the above-mentioned sheet lamp further includes: a heat dissipating strip mounted in the lamp socket together with the strip light source for fixing the strip light source and absorbing heat emitted by the strip light source.
  • the above-mentioned sheet lamp further includes: a reflective liner which is mounted on the light guide plate, and a reflective surface of the reflective liner is opposite to a prism surface of the light guide plate.
  • the reflection lining is made of plastic, paper or a metal material.
  • the present invention also provides a light fixture comprising: the above-mentioned sheet lamp; a bottom frame for accommodating the sheet lamp; and a constant current source of the strip light source, the constant current source of the strip light source being mounted through the connecting member On the bottom frame, its output is connected to the strip light source by wires.
  • the present invention also provides a method of manufacturing the prismatic light guide plate, the method comprising: pouring a prepolymerized slurry containing methyl methacrylate into a laminate of a prism mold having a plurality of prism guides Corresponding shape of the light plate; polymerizing the methyl methacrylate slurry into a polymethyl methacrylate sheet; opening the laminate of the mold, taking out the polymethyl methacrylate sheet; and cutting the polymethyl methacrylate sheet a material to form a prismatic light guide plate having a predetermined size.
  • the concept of the present invention it is possible to provide a triangular microprism light guide plate which is excellent in brightness and uniformity of the emitted light.
  • the sheet lamp and the sheet lamp made of the same are thin-walled, so that the sheet lamp can be embedded in the wall body and can be in the same plane as the plane of the wall.
  • Such thin sheet lamps can be widely used, for example, in kitchen stoves. With walls, kitchen cabinets, bathroom mirrors, stairways and stairways, public corridors, wall advertising, factory assembly lines, and more.
  • the lamp of the lamp has a small power consumption, and the same illumination brightness as that of the ordinary light bulb can be obtained when the power is one tenth of the ordinary light bulb, and the heat dissipation amount is small and the service life is long.
  • This can expand and facilitate the space for human life, work and study, and achieve the goal of high efficiency, energy saving and safe use. It also has the advantages of simple structure and easy use.
  • Figure 1 is a cross-sectional view of a symmetrical equi-section triangular prism light guide plate.
  • FIG. 2a and 2b are a cross-sectional view and a plan view, respectively, of a sheet lamp made of the light guide plate of Fig. 1.
  • Figure 3 is a cross-sectional view of the sheet lamp of the sheet lamp of Figure 2.
  • FIG. 4 is a cross-sectional view of an asymmetric cross-section triangular prism light guide plate.
  • Figure 5 is a cross-sectional view of the sheet lamp made of the light guide plate of Figure 4.
  • Figure 6 is a cross-sectional view of the sheet lamp made with the sheet lamp of Figure 5;
  • Fig. 7 is a perspective view of a circular light guide plate of an equal-section triangular prism.
  • Figure 8 is a cross-sectional view of the circular lamp made of the pattern light guide of Figure 7.
  • Figure 9 is a cross-sectional view of a circular luminaire as a ceiling light made of a circular plate lamp.
  • Figure 10 is a cross-sectional view of a variable angle critical edge triangular microprism light guide plate.
  • Figure 11 is a comparison curve of illuminance uniformity of a circular plate lamp processed by the pouring process and the injection molding process, respectively.
  • the applicant hereby introduces the concept of a critical edge of light reception.
  • the side of each of the microprism bodies in the triangular cross section that is far from the lamp body and that is directed toward the lamp body to receive the light emitted by the lamp body is called a light receiving critical edge, and is also a triangular prism body.
  • the extension line of the light-receiving critical edge intersects the smooth plane and forms a critical angle with the normal of the smooth plane, and the critical angle ranges from 40 degrees to 90 degrees.
  • FIGS. 1 to 9 shows a microprism light guide plate having an equilateral cross section.
  • the Applicant has found that the brightness of the outgoing light of the equal-section triangular microprism light guide plate and its fabricated lamp and sheet lamp is very good, but the uniformity is somewhat deficient.
  • the present invention discloses a triangular microprism light guide plate with a variable angle critical edge instead of the above-mentioned equal-section triangular microprism light guide plate, that is, an angle of a light-receiving critical edge of each microprism in the light guide plate is designed to be Gradient within a set range, so that the outgoing light is evenly distributed.
  • Figure 10 shows a cross-sectional view of an exemplary asymmetrically shaped variable angle critical edge triangular prismatic light guide.
  • n prisms on the prism surface of the light guide plate, and the n prisms can be divided into m groups, and the critical edge angle of the micro prism body in each group is from the microcolumn prism body closest to the smooth plane of the triangle vertex to the triangle vertex distance
  • the farthest microcolumn prism body in the smooth plane is stepwisely increased in a stepwise manner, where m is greater than or equal to 3.
  • the critical angle of the microcolumn prism body whose triangle vertex is closest to the smooth plane is x
  • the critical angle of the microcolumn prism body whose triangle vertex is farthest from the smooth plane is y
  • the critical angle of the adjacent two sets of prism bodies The difference is (yx) / m.
  • the plurality of prisms on the prism surface of the light guide plate are divided into four groups, the microcolumn prism body closest to the smooth plane from the vertex vertex to the smooth plane, and the microcolumn prism body farthest from the smooth plane of the triangle vertex,
  • the critical angle of one set of prisms is 50 degrees
  • the critical angle of the second set of prisms is 56 degrees
  • the critical angle of the third set of prisms is 63 degrees
  • the critical angle of the fourth set of prisms is 70 degrees.
  • the critical angle can be a gradual change in addition to the step change described above.
  • the critical angle of the microcolumn prism body whose triangle vertex is closest to the smooth plane is x
  • the critical angle of the microcolumn prism body whose triangle vertex is farthest from the smooth plane is y
  • the difference between the critical angles of the adjacent two prism bodies is (yx) / n.
  • the angle formed by the other side of the non-light-receiving critical edge of the cross-sectional triangle of each micro-column prism and the normal of the smooth plane ranges from 0 to 40 degrees.
  • the other side of the non-light-receiving edge of the cross-section triangle of each micro-pillar prism body forms an angle of 0 with the normal of the smooth plane.
  • FIG. 10 shows a cross-sectional view of the asymmetrically shaped variable-angle critical-edge triangular prism light guide plate
  • FIG. 10 shows a cross-sectional view of the asymmetrically shaped variable-angle critical-edge triangular prism light guide plate
  • those skilled in the art will readily understand that when the cross-sectional view shown in FIG. 10 is symmetrically arranged left and right, it will be directly obtained.
  • the prism light guide plate of the present invention may be made of a transparent plastic of polycarbonate or polymethyl acrylate.
  • the invention provides a method for manufacturing a prismatic light guide plate of polymethyl methacrylate (PMMA), Methyl methacrylate (MMA) is used to make a prismatic light guide plate by a potting process in a prism mold.
  • PMMA polymethyl methacrylate
  • MMA Methyl methacrylate
  • PMMA plexiglass Due to its good light transmission properties, PMMA plexiglass is widely used in many products. Applicants have found in practice that PMMA has its limitations. For example, when a prismatic light guide plate is produced by injection molding, after the PMMA is injection molded, if a circular light guide plate is fabricated, the optical structure at the center of the circle will be irregularly deformed. The range is locally raised, thereby changing the trajectory of the light beam in the light guide plate, and the optical path of the entire optical element is changed. Therefore, the prismatic light guide plate is formed by injection molding to deviate from the design requirements.
  • the invention provides a PMMA prism light guide plate with a small deformation-free or deformation degree by using a watering method of the MMA raw material, thereby obtaining a prism light guide plate ensuring a firm optical design to ensure uniform illumination of the prepared light guide plate. , or ideal for lighting.
  • the manufacturing method of the PMMA light guide plate includes the following process flow:
  • Ii film opening film The pre-polymerization process is performed first.
  • a slurry containing methyl methacrylate was prepared at a temperature of 50 ° C and an uninterrupted stirring time of 30 hours to form a prepolymerized slurry.
  • the sulphuric acid methacrylate is 0. 5%, methacrylic acid methacrylate 0. 2%, azobisisobutyl butyl methacrylate Nitrile 0. 25%.
  • the pre-polymerized slurry is poured into a laminate having a prism mold, and the mixture is sealed.
  • the above splint mold was sunk into the water at 80 ° C for 20 hours.
  • the above completed polymerization mold was pushed into a 105 ° C steam chamber for 1 hour.
  • the mold was uniformly cooled to room temperature within 1 hour before the mold was opened.
  • the methyl methacrylate slurry was polymerized into a polymethyl methacrylate sheet.
  • the laminate of the mold was opened and the polymethyl methacrylate sheet was taken out.
  • the polymethyl methacrylate sheet is cut to form a prismatic light guide plate having a desired size. Thereafter, the cut prism light guide plate is subjected to machining, washing and drying, packaging, and the like.
  • Fig. 11 is a graph showing the illuminance uniformity of a circular plate lamp made of a light guide plate processed by a potting process and an injection molding process, respectively.
  • a circular light guide plate having a diameter of 6 inches and a critical angle of 50 degrees is used.
  • the 501 lux illuminance closed curve of the circular plate lamp made by the light guide plate processed by the pouring process has an apple-shaped distribution
  • the 501 lux illuminance closed curve of the circular plate lamp made by the light guide plate processed by the injection molding process has a pear-shaped distribution.
  • the 501 lux illuminance curve of the circular plate lamp processed by the pouring process can reach 120 cm or more, and the 501 lux illuminance curve of the circular plate lamp processed by the injection molding process can only reach about 100 cm. .
  • the circular plate lamp made of the light guide plate made by the pouring process can achieve ideal uniform illumination.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Description

微棱镜导光板及其制造方法、 及其制成的片灯、 片灯具 技术领域
本发明涉及一种微型棱镜式导光板， 尤其涉及一种变角度临界边的三角形棱 镜导光板及其制造方法， 以及由其制成的各种形状片灯、 片灯具。 背景技术
在本申请的申请人于 2008年 8月 26 日提交的申请号为 PCT/CN2008/001535 的 PCT国际申请中，本申请人提出了一种等截面三角形定向棱镜导光板及由其制成 的片灯、 片灯具。 通过引用， 将该申请全文结合于此。
图 1示出了一种对称设置的等截面三角形微型棱镜导光板， 在导光板 1称为 棱镜面 11的一个表面上从对称中心平面 00 '起的左右两边各设有多个平行的条状 微柱棱镜体 111， 每一个微柱棱镜体 111的横截面为三角形， 其中， 所述多个三角 形呈锯齿形连续分布且彼此截面形状是相同的，与对称中心平面相邻的左右两个三 角形的顶点距导光板的光滑平面 12的垂直距离最短， 向着左右两侧其顶点距导光 板的光滑表面的垂直距离逐渐递增， 各个三角形的顶点在水平方向的距离是相等 的， 各为 δ。 这样， 整个三角形棱镜体长度为 δ Χ 2η， 其中， η是对称中心平面一 侧的三角形棱镜体的数量。 另外， 可把近光滑平面 12的三角形顶点连起来， 以及 把远离光滑平面 12的相邻三角形顶点连起来， 以中心平面左半侧为例， 得到二条 直线或连线所在的二个平面， 这二条直线（二个平面）是倾斜的但相互平行。 该两 条直线分别与导光板的截面中心轴线相交于 Α和 Η点， 为 AN、 HM， 它们和导光板 的光滑平面 12均形成夹角 a， a小于 45度， 较佳的小于 10度。
图 2a和 2b示出了一种片灯， 它包括导光板 1和多个灯体 2。在片灯中， 导光 板 1在距中心平面两侧最外的两个三角形棱镜体外设有长条状的凸缘，以形成用于 容纳多个灯体 2的灯槽 14、 14 '。 灯体 2为发光二极管 LED、 灯泡、 电极管或预 制成多个发光二极管灯管组件。较佳的， 灯体 2为经预制的、 由含有多个发光二极 管贴片 21和线路板 22构成的长条形灯组件， 且该灯组件直接安放在灯槽 14、 14 ' 内， 使灯槽内的发光二极管贴片 21的发射平面与灯槽内壁相紧贴并和导光板各截 面三角形顶点连线所在的面相交成 90— α的夹角， 以使发光二极管贴片 21的光线 可从导光板的两端各自射向以中心平面为界的任一侧的等截面直角三角形棱镜体。 以上所述发光二极管和 LED贴片是低功率管，并可于一个 LED贴片中设置数个芯片。
该片灯还可选地包括边框 3和反射衬片 5。 边框 3可包括散热条 31和上下两 个封头 32，它们相连接而构成的一矩形框架。两条散热条 31由金属导热如铝合金、 铜合金材料制成， 两个封头 32由有机玻璃、 聚碳酸脂或聚甲基丙稀酸脂的透明塑 料制成。 反射衬片 5是一片材， 架设于导光板 1上方。 反射衬片 5可以是由塑料、 纸张或金属材料， 例如铝合金、 铜合金等制成的。 此外， 片灯还可以包括两个接线 端子 29。
图 3示出用上述片灯制成的片灯具。 该片灯具进一步包括底框 4和恒流源 7。 底框 4是一金属材料制成的矩形框架。灯体 2的恒流源 Ί是通过连接件安装在底框 4的上的，它的输出端通过导线连接到接线端子 29，输入端可通过电源插孔连接电 源。
图 4-6分别示出了非对称设置的等截面三角形定向棱镜导光板、 片灯及片灯 具。其具体结构与图 1-3所示的对称设置的等截面三角形定向棱镜导光板、片灯及 片灯具类似， 因此省略对其的具体描述。
在本申请的申请人于 2008年 8月 26 日提交的申请号为 PCT/CN2008/001534 的 PCT国际申请中，本申请人提出了一种等截面三角形定向棱镜圆形导光板及由其 制成的圆板灯、 圆板灯具。 通过引用， 将该申请全文结合于此。
图 7-9分别示出了等截面三角形定向棱镜图形导光板、 圆板灯及圆板灯具。 其具体结构与图 1-3所示的对称设置的等截面三角形定向棱镜导光板、片灯及片灯 具类似， 因此省略对其的具体描述。
在进一步的研究中， 申请人发现在上述结构的导光板及其制成的片灯和片灯 具中， 出射光线的亮度非常理想， 但均匀度有一定的欠缺。 因此， 需要对其作进一 步的改进。 发明内容
本发明的目的是提供一种出射光线的亮度和均匀度均非常理想的三角形微型 棱镜导光板及其制造方法、 以及由其制成的片灯、 片灯具。
为了实现上述目的， 本发明提供了一种非对称形的三角形微型棱镜导光板， 它包括： 光滑平面； 和棱镜面， 在所述棱镜面上设有多个平行的条状微柱棱镜体， 每一个微柱棱镜体的横截面为三角形，从左至右或从右至左各三角形的顶点距所述 光滑平面的距离逐渐递增，其顶点的连线是一条直线， 该直线与所述光滑平面形成 的夹角 α小于 45度， 在三角形顶点距光滑平面最远的微柱棱镜体外设置有一带状 光源，各微柱棱镜体的截面三角形中离所述带状光源较远且接收带状光源发出的光 的一边称为受光临界边，所述受光临界边和所述光滑平面的法线成一临界角，所述 临界角范围从 40度到 90度，并且从三角形顶点距光滑平面最近的微柱棱镜体向三 角形顶点距光滑平面最远的微柱棱镜体所述临界角逐渐递增。
本发明还提供了一种对称形的三角形微型棱镜导光板， 它包括： 光滑平面； 和棱镜面，在所述棱镜面对称地设有多个平行的条状微柱棱镜体，每一个微柱棱镜 体的横截面为三角形，从对称中心向着左右两侧各三角形顶点距所述光滑平面的距 离逐渐递增，各三角形顶点的连线是两条倾斜的直线， 该直线是与所述光滑平面均 形成的夹角 α小于 45度， 在三角形顶点距光滑平面最远的两个微柱棱镜体外设置 有两个带状光源，各微柱棱镜体的截面三角形中离所述带状光源较远且接收带状光 源发出的光的一边称为受光临界边，所述受光临界边和所述光滑平面的法线成一临 界角，所述临界角范围从 40度到 90度， 并且从对称中心向着左右两侧所述微柱棱 镜体的所述临界角逐渐递增。
本发明还提供了一种三角形微型棱镜圆形导光板， 它包括： 光滑平面； 和棱 镜面， 在所述棱镜面上从中心轴线起的径向方向设有多个同心的环状微柱棱镜体， 通过中心轴线所作的垂直截面，每一个环状微柱棱镜体的横截面为三角形，从中心 轴线向着左右两侧的周边各环状微柱棱镜体的截面三角形顶点距所述光滑表面的 距离逐渐递增， 各环状微柱棱镜体的截面三角形顶点的径向连线是两条倾斜的直 线， 所述直线与所述光滑表面形成的夹角 α小于 45度， 在三角形顶点距光滑平面 最远的环状微柱棱镜体外设置有一环形的带状光源，各环状微柱棱镜体的截面三角 形中离所述带状光源较远且接收带状光源发出的光的一边称为受光临界边，所述受 光临界边和所述光滑平面的法线成一临界角，所述临界角范围从 40度到 90度， 并 且从中心轴线向着左右两侧的周边所述环状微柱棱镜体的所述临界角逐渐递增。
对于上述导光板， 各微柱棱镜体的截面三角形中相对于受光临界边的另一边 与所述光滑平面的法线形成的夹角的范围为 0度到 40度。
对于上述导光板， 各微柱棱镜体的截面三角形中相对于受光临界边的另一边 与所述光滑平面的法线形成的夹角为 0度。
对于上述导光板， 所述棱镜面有 η个棱镜， 所述 η个棱镜被分成 m组， 所述 微柱棱镜体的所述临界角按各组按阶跃方式逐渐递增， 其中 m大于等于 3。 对于上述导光板， 所述直线与所述光滑表面形成的夹角 α小于 10度。
对于上述导光板， 在三角形顶点距光滑平面最远的微柱棱镜体外设有长条状 的凸缘， 以形成用于容纳所述带状光源的灯槽。
对于上述导光板， 各个截面三角形在长度方向上的距离是相等的， 所述长度 方向平行于所述光滑平面。
对于上述导光板， 所述导光板是由聚碳酸脂或聚甲基丙稀酸脂的透明塑料制 成。
本发明还提供了一种片灯， 它包括： 上述的导光板， 其中在三角形顶点距光 滑平面最远的微柱棱镜体外设有长条状的凸缘，以形成用于容纳所述带状光源的灯 槽； 以及安装于所述灯槽内的带状光源。
对于上述片灯， 所述带状光源为经预制的、 由含有多个发光二极管贴片和线 路板构成的长条形灯组件，并且所述带状光源发射平面与所述灯槽内壁相紧贴并平 行于所述导光板的光滑平面。
对于上述片灯， 所述发光二极管贴片中的发光二极管是低功率管， 并可于一 个发光二级管贴片中设置数个发光二级管。
对于上述片灯， 还包括： 散热条， 与所述带状光源一同安装于所述灯槽内， 用于固定所述带状光源并吸收所述带状光源发出的热量。
对于上述片灯， 还包括： 反射衬片， 它架设于所述导光板上， 所述反射衬片 的反射面与所述导光板的棱镜面相对。
对于上述片灯， 所述反射衬片由塑料、 纸张或金属材料制成。
本发明还提供了一种灯具， 它包括： 上述片灯； 用于容纳所述片灯的底框； 以及带状光源的恒流源，所述带状光源的恒流源通过连接件安装在底框上，它的输 出端通过导线连接到所述带状光源。
本发明还提供了一种制造上述棱镜导光板的方法， 该方法包括： 把预聚合的 含有甲基丙烯酸甲酯的浆液灌入棱镜模具的层板内，所述棱镜模具具有与多个棱镜 导光板对应的形状； 使甲基丙烯酸甲酯浆液聚合成聚甲基丙烯酸甲酯片材； 打开模 具的层板， 取出聚甲基丙烯酸甲酯片材； 以及切割所述聚甲基丙烯酸甲酯片材， 以 形成具有预定大小的棱镜导光板。
根据本发明的构思， 可提供一种出射光线的亮度和均匀度均非常理想的三角 形微型棱镜导光板。 由其制成的片灯、 片灯具是薄壁型的， 因而片灯具可嵌装在墙 体内， 并可与墙体平面处于同一平面。这类薄型的片灯具可广泛应用于例如厨房灶 具所在的墙面、 厨柜内壁、 卫生间的镜子上方、 楼梯和楼梯走道、 公共走廊， 墙面 广告照明， 工厂流水线等等。 另一方面， 该片灯具的片灯耗电量小， 在其功率为普 通灯泡的十分之一或情况下可得到与普通灯泡同样的照明亮度， 而且散热量小，使 用寿命长。 这可扩大和方便人类的生活、 工作、 学习的空间， 并达到高效节能、 使 用安全的目的， 还具有结构简约、 使用简便的优点。 附图简要说明
图 1是对称形的等截面三角形棱镜导光板的剖视图。
图 2a和 2b分别是图 1的导光板制成的片灯的剖视图和俯视图。
图 3是图 2的片灯制成的片灯具的剖视图。
图 4是非对称形的等截面三角形棱镜导光板的剖视图。
图 5是图 4的导光板制成的片灯的剖视图；
图 6是用图 5的片灯制成的片灯具的剖视图；
图 7是等截面三角形棱镜圆形导光板的立体视图。
图 8是图 7的图形导光板制成的圆板灯的剖视图。
图 9是圆板灯制成的作为吊顶灯的圆板灯具的剖视图。
图 10是变角度临界边三角形微型棱镜导光板的剖面图。
图 11 是分别用灌浇工艺和注塑工艺加工的圆板灯的照度均匀性的对比曲线
具体实施方式
为了描述的需要， 申请人在此引入受光临界边的概念。 在上述导光板、 片灯、 片灯具中，各微型棱镜体的截面三角形中离灯体较远且向着灯体照射方向以接受灯 体发出的光的一边称为受光临界边， 也是三角形棱镜体的受光临界面， 该受光临界 边的延长线与光滑平面相交并与光滑平面的法线成一临界角， 这一临界角范围从 40度到 90度。 变角度临界边的三角形的微型棱镜导光板
上述图 1到图 9均示出等截面三角形的微型棱镜导光板。通过进一步的研究， 申请人发现等截面三角形微型棱镜导光板及其制成的片灯和片灯具的出射光线的 亮度非常理想， 但均匀度有一定的欠缺。 为了解决上述技术问题， 本发明揭示了一种变角度临界边的三角形微型棱镜 导光板， 以取代上述等截面三角形微型棱镜导光板， 即导光板中各个微型棱镜的受 光临界边的角度被设计成在一个设定范围内渐变的， 从而使得出射的光线均匀分 配。
图 10示出了一个示例性的非对称形的变角度临界边的三角形微型棱镜导光板 的剖视图。在导光板的棱镜面上设有 n个棱镜， 这 n个棱镜可被分成 m组， 各组中 微型棱镜体的临界边的角度从三角形顶点距光滑平面最近的微柱棱镜体向三角形 顶点距光滑平面最远的微柱棱镜体按阶跃方式逐阶递增，其中 m大于等于 3。例如， 假设三角形顶点距光滑平面最近的微柱棱镜体的临界角为 x， 三角形顶点距光滑平 面最远的微柱棱镜体的临界角为 y， 则相邻的两组棱镜体的临界角之差为（y-x) /m。
在图 10所示的实例中， 导光板棱镜面上的多个棱镜被分成 4组， 从三角形顶 点距光滑平面最近的微柱棱镜体向三角形顶点距光滑平面最远的微柱棱镜体，第一 组棱镜的临界角为 50度， 第二组棱镜的临界角为 56度， 第三组棱镜的临界角为 63度， 第四组棱镜的临界角为 70度。
本领域的技术人员很容易理解， 临界角除了采用上述阶跃式的变化外， 也可 以采用渐变式的。如在导光板的棱镜面上设有 n个棱镜，三角形顶点距光滑平面最 近的微柱棱镜体的临界角为 x， 三角形顶点距光滑平面最远的微柱棱镜体的临界角 为 y， 则相邻的两个棱镜体的临界角之差为（y-x) /n。
另外， 各微柱棱镜体的截面三角形中非受光临界边的另一边与光滑平面的法 线形成的夹角的范围为 0度到 40度。 较佳的， 各微柱棱镜体的截面三角形中非受 光临界边的另一边与光滑平面的法线形成的夹角为 0度。当各微柱棱镜体的截面三 角形中非受光临界边的另一边与光滑平面的法线形成的夹角为 0度时，可以在相同 长度的导光板上配置较多数量的微型棱镜体， 从而能够有效提高灯具的亮度。
另外，虽然图 10示出了非对称形的变角度临界边三角形棱镜导光板的剖视图， 但是本领域的技术人员很容易理解， 当左右对称地配置图 10所示的剖面图时， 将 直接得到对称形和圆形的变角度临界边三角形棱镜导光板的剖视图，因此不再对对 称形和圆形的变角度临界边三角形棱镜导光板作重复描述。 棱镜导光板的制造方法
本发明的棱镜导光板可以是由聚碳酸脂或聚甲基丙稀酸脂的透明塑料制成。 本发明提供了一种聚甲基丙烯酸甲酯 (PMMA)的棱镜导光板的制造方法， 用甲 基丙烯酸甲酯 (MMA)在棱镜模具内用灌浇的工艺来制作棱镜导光板。
由于 PMMA有机玻璃透光性能好， 被广泛地用于许多产品上。 申请人在实践中 发现 PMMA有它的局限性， 例如在利用注塑成型制作棱镜导光板时， PMMA被注塑成 型后， 如果制作的是圆形导光板， 那么圆中心的光学结构会产生不规则变形， 范围 会局部隆起， 从而改变了光束在导光板中的轨迹， 整个光学元件的光路被改变。 因 此用注塑成型的方法来制作棱镜导光板背离了设计要求。
本发明提供一种用 MMA原材料采用浇灌的方法以获取一种无变形或变形程度 小的 PMMA棱镜导光板， 从而取得一种保证坚定光学设计的棱镜导光板， 以确保制 成的导光板均匀照明， 或理想的配光照明。
这种灌浇 PMMA导光板的制造方法包括如下工艺流程：
i i 片 翁 开 片
Figure imgf000009_0001
首先执行预聚合过程。 制作含有甲基丙烯酸甲酯的浆液， 温度为 50°C， 不间 断地搅拌时间为 30小时以形成预聚合的浆液。 该浆液的具体配方为： 甲基丙烯酸 甲酯 98. 9%， 硬脂酸 0. 5%， 甲基丙烯 0. 15%， 甲基丙烯酸乙二醇酯 0. 2%， 偶氮二异 丁腈 0. 25%。
然后， 把已完成预聚合的浆液灌入有棱镜模具的层板内， 封口聚合。 把以上 夹板模具沉入 80°C的水域， 保持 20小时。 把以上完成聚合的模具推入 105 °C蒸汽 室， 保持 1小时。 开模前 1小时内把模具均匀地冷却到常温。 这时， 甲基丙烯酸甲 酯浆液聚合成聚甲基丙烯酸甲酯片材。打开模具的层板，取出聚甲基丙烯酸甲酯片 材。 切割聚甲基丙烯酸甲酯片材， 以形成具有所需大小的棱镜导光板。 之后， 对切 割的棱镜导光板作机械加工、 清洗干燥， 包装等处理。
图 11示出了分别用灌浇工艺和注塑工艺加工的导光板制成的圆板灯的照度均 匀性的对比曲线图。 其中使用直径为 6寸临界角为 50度的圆形导光板。 用灌浇工 艺加工的导光板制成的圆板灯的 501ux照度封闭曲线具有苹果形分布，用注塑工艺 加工的导光板制成的圆板灯的 501ux照度封闭曲线具有梨形分布。例如，在相对于 圆板灯中心轴 40度处， 用灌浇工艺加工的圆板灯的 501ux照度曲线可达到 120cm 以上， 而用注塑工艺加工的圆板灯的 501ux照度曲线只能达到 100cm左右。 显然， 用灌浇工艺制作的导光板制成的圆板灯能实现较理想的均匀照明。
以上所述包括本发明的诸多示例。 当然， 为描述本发明而对每一能想到的组 件或方法组合进行描述是不可能的，但本领域普通技术人员明白本发明的更多排列 和组合是可能的。因此，本发明旨在包含所有这样的在所附权利要求书精神和范围 内的变更、 修改、 和变化。

Claims

权 利 要 求
1 . 一种非对称形的三角形微型棱镜导光板， 其特征在于， 它包括： 光滑平面； 和
棱镜面， 在所述棱镜面上设有多个平行的条状微柱棱镜体， 每一个微柱棱镜 体的横截面为三角形，从左至右或从右至左各三角形的顶点距所述光滑平面的距离 逐渐递增， 其顶点的连线是一条直线， 该直线与所述光滑平面形成的夹角 α小于 45 度， 在三角形顶点距光滑平面最远的微柱棱镜体外设置有一带状光源， 各微柱 棱镜体的截面三角形中离所述带状光源较远且接收带状光源发出的光的一边称为 受光临界边，所述受光临界边和所述光滑平面的法线成一临界角，所述临界角范围 从 40度到 90度，并且从三角形顶点距光滑平面最近的微柱棱镜体向三角形顶点距 光滑平面最远的微柱棱镜体所述临界角逐渐递增。
2. 一种对称形的三角形微型棱镜导光板， 其特征在于， 它包括：
光滑平面； 和
棱镜面， 在所述棱镜面对称地设有多个平行的条状微柱棱镜体， 每一个微柱 棱镜体的横截面为三角形，从对称中心向着左右两侧各三角形顶点距所述光滑平面 的距离逐渐递增，各三角形顶点的连线是两条倾斜的直线， 该直线是与所述光滑平 面均形成的夹角 α小于 45度， 在三角形顶点距光滑平面最远的两个微柱棱镜体外 设置有两个带状光源，各微柱棱镜体的截面三角形中离所述带状光源较远且接收带 状光源发出的光的一边称为受光临界边，所述受光临界边和所述光滑平面的法线成 一临界角，所述临界角范围从 40度到 90度， 并且从对称中心向着左右两侧所述微 柱棱镜体的所述临界角逐渐递增。
3. 一种三角形微型棱镜圆形导光板， 其特征在于， 它包括：
光滑平面； 和
棱镜面， 在所述棱镜面上从中心轴线起的径向方向设有多个同心的环状微柱 棱镜体，通过中心轴线所作的垂直截面，每一个环状微柱棱镜体的横截面为三角形， 从中心轴线向着左右两侧的周边各环状微柱棱镜体的截面三角形顶点距所述光滑 表面的距离逐渐递增，各环状微柱棱镜体的截面三角形顶点的径向连线是两条倾斜 的直线， 所述直线与所述光滑表面形成的夹角 α小于 45度， 在三角形顶点距光滑 平面最远的环状微柱棱镜体外设置有一环形的带状光源，各环状微柱棱镜体的截面 三角形中离所述带状光源较远且接收带状光源发出的光的一边称为受光临界边，所 述受光临界边和所述光滑平面的法线成一临界角， 所述临界角范围从 40 度到 90 度，并且从中心轴线向着左右两侧的周边所述环状微柱棱镜体的所述临界角逐渐递 增。
4. 如权利要求 1或 2或 3所述的导光板， 其特征在于， 各微柱棱镜体的截面 三角形中相对于受光临界边的另一边与所述光滑平面的法线形成的夹角的范围为 0度到 40度。
5. 如权利要求 1或 2或 3所述的导光板， 其特征在于， 各微柱棱镜体的截面 三角形中相对于受光临界边的另一边与所述光滑平面的法线形成的夹角为 0度。
6. 如权利要求 1或 2或 3所述的导光板， 其特征在于， 所述棱镜面有 n个棱 镜，所述 n个棱镜被分成 m组，所述微柱棱镜体的所述临界角按各组按阶跃方式逐 渐递增， 其中 m大于等于 3。
7. 如权利要求 1或 2或 3所述的导光板， 其特征在于， 所述直线与所述光滑 表面形成的夹角 α小于 10度。
8. 如权利要求 1或 2或 3所述的导光板， 其特征在于， 在三角形顶点距光滑 平面最远的微柱棱镜体外设有长条状的凸缘， 以形成用于容纳所述带状光源的灯 槽。
9. 如权利要求 1或 2或 3所述的导光板， 其特征在于， 各个截面三角形在长 度方向上的距离是相等的， 所述长度方向平行于所述光滑平面。
10. 如权利要求 1或 2或 3所述的导光板， 其特征在于， 所述导光板是由聚 碳酸脂或聚甲基丙稀酸脂的透明塑料制成。
11. 一种片灯， 其特征在于， 它包括：
如权利要求 1或 2或 3所述的导光板， 其中在三角形顶点距光滑平面最远的 微柱棱镜体外设有长条状的凸缘， 以形成用于容纳所述带状光源的灯槽； 以及 安装于所述灯槽内的带状光源。
12. 如权利要求 11所述的片灯， 其特征在于， 所述带状光源为经预制的、 由 含有多个发光二极管贴片和线路板构成的长条形灯组件，并且所述带状光源发射平 面与所述灯槽内壁相紧贴并平行于所述导光板的光滑平面。
13. 如权利要求 12所述的片灯， 其特征在于， 所述发光二极管贴片中的发光 二极管是低功率管， 并可于一个发光二级管贴片中设置数个发光二级管。
14. 如权利要求 11所述的片灯， 其特征在于， 还包括： 散热条， 与所述带状光源一同安装于所述灯槽内， 用于固定所述带状光源并 吸收所述带状光源发出的热量。
15. 如权利要求 11所述的片灯， 其特征在于， 还包括：
反射衬片， 它架设于所述导光板上， 所述反射衬片的反射面与所述导光板的 棱镜面相对。
16. 如权利要求 15所述的片灯， 其特征在于， 所述反射衬片由塑料、 纸张或 金属材料制成。
17. 一种灯具， 其特征在于， 它包括：
如权利要求 11所述的片灯；
用于容纳所述片灯的底框； 以及
带状光源的恒流源， 所述带状光源的恒流源通过连接件安装在底框上， 它的 输出端通过导线连接到所述带状光源。
18. —种制造如权利要求 1或 2或 3所述的棱镜导光板的方法， 其特征在于， 该方法包括：
把预聚合的含有甲基丙烯酸甲酯的浆液灌入棱镜模具的层板内， 所述棱镜模 具具有与多个棱镜导光板对应的形状；
使甲基丙烯酸甲酯浆液聚合成聚甲基丙烯酸甲酯片材；
打开模具的层板， 取出聚甲基丙烯酸甲酯片材； 以及
切割所述聚甲基丙烯酸甲酯片材， 以形成具有预定大小的棱镜导光板。
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