US20110063857A1 - Composite lens plate - Google Patents
Composite lens plate Download PDFInfo
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- US20110063857A1 US20110063857A1 US12/559,180 US55918009A US2011063857A1 US 20110063857 A1 US20110063857 A1 US 20110063857A1 US 55918009 A US55918009 A US 55918009A US 2011063857 A1 US2011063857 A1 US 2011063857A1
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- lenses
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- refractive elements
- elements
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Classifications
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- 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
- F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
-
- 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
- F21V5/04—Refractors for light sources of lens shape
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
- G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
- G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0043—Inhomogeneous or irregular arrays, e.g. varying shape, size, height
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/69—Details of refractors forming part of the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/10—Outdoor lighting
- F21W2131/103—Outdoor lighting of streets or roads
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- 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
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- 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
Definitions
- the present invention relates to a lens plate, and more particularly to a composite lens plate.
- LEDs light emitting diodes Due to its small volume, high luminance, long service life, low power consumption and other properties, the LED has become a new generation lighting device. For example, in Taiwan, all traffic lights use LED lighting devices. Since an LED lighting device includes many LEDs, the traffic lights can achieve a warning effect even if several LEDs fail.
- the LED lighting devices are also commonly used in street lamps.
- the LED lighting devices need to meet the requirements for high luminance, low power consumption, particular illumination range (also referred to as light distributions), and the like.
- particular illumination range also referred to as light distributions
- different local governments have different regulations on light distributions generated by the street lamps.
- the so-called light distributions refers to an illumination range formed by light projected from a lighting device on a road surface.
- a lens plate is disposed in front of the LED lighting device, so as to refract light emitted by all LEDs to a predetermined position.
- LEDs are properly arranged so as to achieve a required light distributions.
- at least one mold needs to be designed for each light distributions, so as to fabricate a lens required by the light distributions. Therefore, when bidding for the manufacturing of street lamps for different road sections, a manufacturer needs to design different molds, which increases the cost and is not economical.
- the present invention is a composite lens plate applied in an LED lighting device.
- the composite lens plate is applied in an LED lighting device having a plurality of LEDs.
- the composite lens plate comprises a substrate and a plurality of refractive elements.
- the refractive elements are disposed on the substrate and one-to-one corresponding to the LEDs.
- the refractive elements guide light emitted by the corresponding LEDs.
- Each refractive element has a refractive property.
- the refractive elements are classified into at least two types of lenses according to the refractive property.
- the refractive elements of lenses of the same type have substantially the same refractive property.
- the refractive property of the refractive elements of lenses of one type is substantially different from the refractive property of the refractive elements of lenses of another type.
- the refractive elements are classified into three types of lenses according to the refractive property.
- the lenses comprise a first type of lenses, a second type of lenses, and a third type of lenses.
- the first type of lenses, the second type of lenses, and the third type of lenses have different refractive properties.
- a major-axis refraction angle of the refractive elements of the first type of lenses is 135° to 175°, and a minor-axis refraction angle of the refractive elements of the first type of lenses is 75° to 105°.
- a major-axis refraction angle of the refractive elements of the second type of lenses is 105° to 135°, and a minor-axis refraction angle of the refractive elements of the second type of lenses is 50° to 75°.
- a major-axis refraction angle of the refractive elements of the third type of lenses is 75° to 105°, and a minor-axis refraction angle of the refractive elements of the third type of lenses is 30° to 50°.
- light emitted by the LEDs can form different light distributions after passing through the composite lens plate.
- FIG. 1 is a schematic three-dimensional view of a composite lens plate according to an embodiment of the present invention
- FIG. 2 is a schematic cross-sectional view taken along Line 2 - 2 in FIG. 1 ;
- FIG. 3A is a schematic plan view of a refractive element of a lens of the first type according to the present invention.
- FIG. 3B is a schematic cross-sectional view taken along Line 3 B- 3 B in FIG. 3A ;
- FIG. 4A is a schematic three-dimensional view of a refractive element of a lens of the first type according to the present invention.
- FIG. 4B is a schematic cross-sectional view taken along Line 4 B- 4 B in FIG. 4A ;
- FIG. 5 is a schematic cross-sectional view of an LED lighting device applying an embodiment of the present invention.
- FIG. 6 is a schematic view of a refractive property according to an embodiment of the present invention.
- FIG. 7 is a schematic view of a configuration of refractive elements according to an embodiment of the present invention.
- FIG. 8A is a schematic three-dimensional view of a lens plate according to another embodiment of the present invention.
- FIG. 8B is a schematic cross-sectional view taken along Line 8 B- 8 B in FIG. 8A ;
- FIG. 9A is a schematic three-dimensional view of a mold for the lens plate according to the embodiment of the present invention in FIG. 8A ;
- FIG. 9B is a schematic cross-sectional view taken along Line 9 B- 9 B in FIG. 9A ;
- FIG. 10A is a schematic view of a first light distributions generated according to an embodiment of the present invention.
- FIG. 10B is a schematic view of a second light distributions generated according to an embodiment of the present invention.
- FIG. 10C is a schematic view of a third light distributions generated according to an embodiment of the present invention.
- the composite lens plate of the present invention is applied in an LED lighting device having a plurality of LEDs.
- the lens plate is used for adjusting a light distributions formed by light emitted by the LEDs.
- the lens plate is applied in LED street lamps. Since many countries have regulations on the luminance and illumination range of street lamps, a manufacturer needs to fabricate corresponding lens plates for different areas, so as to comply with the regulations.
- FIG. 1 is a schematic three-dimensional view of a composite lens plate according to an embodiment of the present invention.
- a composite lens plate 20 comprises a substrate 30 and a plurality of refractive elements 40 a, 40 b, 42 a, 42 b .
- the refractive elements 40 a, 40 b, 42 a, 42 b are disposed on the substrate 30 and one-to-one corresponding to the LEDs (to be detailed below).
- the refractive elements 40 a, 40 b, 42 a, 42 b guide light emitted by the corresponding LEDs.
- Each refractive element has a refractive property (to be detailed below).
- the refractive elements are classified into at least two types of lenses 50 , 52 according to the refractive property.
- the refractive elements 40 a, 40 b of the lenses 50 (referred to as a first type of lenses below) have substantially the same refractive property.
- the refractive property of the refractive elements 40 a, 40 b of the lenses 50 is substantially different from the refractive property of the refractive elements 42 a, 42 b of the lenses 52 (referred to as a second type of lenses below).
- FIG. 2 is a schematic cross-sectional view taken along Line 2 - 2 in FIG. 1 .
- the refractive elements 40 a, 40 b of the first type of lenses 50 have substantially the same cross-sectional shape.
- the refractive elements 42 a, 42 b of the second type of lenses 52 have substantially the same cross-sectional shape.
- the cross-sectional shape of the refractive elements of the first type of lenses is substantially different from the cross-sectional shape of the refractive elements of the second type of lenses.
- surfaces of the refractive elements 40 a of the first type of lenses 50 are each an elliptical curved surface.
- the curvature of the curved surface may be designed according to a light distributions generated by the LEDs.
- surfaces of the refractive elements 42 a of the second type of lenses 52 are each an elliptical curved surface having a cone-shaped concave top end.
- FIG. 5 is a schematic cross-sectional view of an LED lighting device 70 applying an embodiment of the present invention.
- the LED lighting device 70 comprises a circuit board 60 and a composite lens plate 20 .
- the composite lens plate 20 is disposed on the circuit board 60 .
- the circuit board 60 has a plurality of LEDs 62 , 64 .
- the refractive elements 40 a, 40 b, 42 a, 42 b are one-to-one corresponding to the LEDs 62 , 64 .
- the shape of the refractive elements 40 a, 40 b of the first type of lenses 50 is different from that of the refractive elements 42 a, 42 b of the second type of lenses 52 , light emitted by the LEDs 62 , 64 is refracted to form different light distributions after passing through the first type of lenses 50 and the second type of lenses 52 (which is the refractive property as described above).
- FIG. 6 is a schematic view of a refractive property according to an embodiment of the present invention.
- light emitted by the LED 62 passes through the refractive element 40 a, and then forms an elliptical light distributions 67 on a projection surface 68 at a particular distance there-from.
- the light distributions 67 is not exactly elliptical, but instead, is somewhat elliptical. Meanwhile, different positions (areas inside the ellipse) may have different light intensities.
- the light distributions 67 has a major axis 66 and a minor axis 65 .
- an angle between two dashed lines connecting the refractive element 40 a with two ends of the major axis 66 is a major-axis refraction angle 46
- an angle between two dashed lines connecting the refractive element 40 a with two ends of the minor axis 65 is a minor-axis refraction angle 48 . That is to say, the above refractive property comprises a major-axis refraction angle 46 and a minor-axis refraction angle 48 .
- the major-axis refraction angle 46 of the refractive elements 40 a, 40 b of the first type of lenses 50 may be 135° to 175°, and preferably 140° to 160°.
- the minor-axis refraction angle 48 of the refractive elements 40 a, 40 b of the first type of lenses 50 may be 75° to 105°, and preferably 80° to 100°.
- the major-axis refraction angle 46 of the refractive elements 42 a, 42 b of the second type of lenses 52 may be 105° to 135°, and preferably 110° to 130°.
- the minor-axis refraction angle 48 of the refractive elements 42 a, 42 b of the second type of lenses 52 may be 50° to 75°, and preferably 45° to 65°.
- the refractive elements 40 a, 40 b, 42 a, 42 b are arranged on the substrate 30 corresponding to the LEDs 62 , 64 . Variations may also be made to the arrangement of the refractive elements and the LEDs. Referring to FIG. 7 , the refractive elements 40 a , 40 b, 42 a, 42 b are arranged on the substrate 30 approximately in the form of a ring. Alternatively, corresponding to this embodiment, the LEDs 62 , 64 are also arranged in the same manner.
- the present invention is not limited thereto, and the refractive elements 40 a , 40 b, 42 a, 42 b may also be arranged in other manners, for example, approximately in a T-shaped or an I-shaped manner.
- FIG. 8A is a schematic three-dimensional view of a lens plate according to another embodiment of the present invention.
- FIG. 8B is a schematic cross-sectional view taken along Line 8 B- 8 B in FIG. 8A .
- the refractive elements 40 a, 40 b, 42 a, 42 b, 44 a, 44 b are classified into three types of lenses 50 , 52 , 54 according to the refractive property.
- the lenses 50 , 52 , 54 comprise a first type of lenses 50 , a second type of lenses 52 , and a third type of lenses 54 .
- the first type of lenses 50 , the second type of lenses 52 , and the third type of lenses 54 have different refractive properties.
- the major-axis refraction angle of the refractive elements 44 a, 44 b of the third type of lenses 54 is 75° to 105°, and preferably 85° to 95°.
- the minor-axis refraction angle of the refractive elements 44 a, 44 b of the third type of lenses 54 is 30° to 50°, and preferably 35° to 45°.
- Surfaces of the refractive elements 44 a, 44 b of the third type of lenses 54 are each a combination of a semi-elliptical curved surface and a columnar body.
- the refractive elements 44 a, 44 b of the third type of lenses have surfaces of the columnar body, an asymmetrical light distributions is formed (to be detailed below).
- the present invention is not limited thereto. Meanwhile, the number of types of lenses obtained by classifying the refractive elements 40 a, 40 b, 42 a, 42 b, 44 a, 44 b according to the refractive property is not limited to three, but may also be four or more.
- a mold 96 comprises a male mold 97 , a female mold 98 , and mold cores 90 a, 90 b , 92 a, 92 b, 94 a, 94 b.
- the female mold 98 has a plurality of openings 99 a, 99 b, 99 c, and each opening 99 a, 99 b, 99 c has the same size as the mold cores 90 a , 90 b, 92 a, 92 b, 94 a, 94 b.
- the mold cores 90 a, 90 b, 92 a, 92 b, 94 a, 94 b are mounted in the openings 99 a, 99 b, 99 c, and then the female mold 98 mounted with the mold cores 90 a, 90 b, 92 a, 92 b, 94 a, 94 b is combined with the male mold 97 , so as to form the mold 96 for the composite lens plate 20 having different refractive elements 96 .
- a manufacturer may select a combination of the mold cores 90 a, 90 b, 92 a, 92 b, 94 a, 94 b as shown in FIG.
- the manufacturer may also select a combination of the mold cores 90 a, 90 b, 92 a, 92 b or the mold cores 92 a, 92 b, 94 a, 94 b, to mold different composite lens plates 20 , so as to meet the requirements for different light distributions.
- FIGS. 10A , 10 B, and 10 C are schematic views of light distributions generated by different lens combinations according to an embodiment of the present invention, in which the center of concentric circles represents the position of a light source (LEDs), each concentric circle represents a contour line indicating a light intensity (160, 240, or 320 candelas per 1000 lumens (cd/klm), as shown in the figures), and each radial line represents an angle with a vertical line passing through the light source (0°, 15°, 30°, 45°, 60°, 75°, 90°, or 105° as shown in the figures).
- FIG. 10A , 10 B, and 10 C are schematic views of light distributions generated by different lens combinations according to an embodiment of the present invention, in which the center of concentric circles represents the position of a light source (LEDs), each concentric circle represents a contour line indicating a light intensity (160, 240, or 320 candelas per 1000 lumens (cd/klm), as shown in the figures), and
- 10A shows light intensity profiles obtained when the refractive elements 40 a, 40 b of the first type of lenses 50 are combined with the refractive elements 44 a, 44 b of the third type of lenses 54 , in which two profiles respectively represent light intensity profiles at the major-axis refraction angle 46 (along the major axis) and at the minor-axis refraction angle 48 (along the minor axis).
- two profiles respectively represent light intensity profiles at the major-axis refraction angle 46 (along the major axis) and at the minor-axis refraction angle 48 (along the minor axis).
- the major-axis refraction angle 46 covers a range of about 75° from the vertical line to the left and about 75° from the vertical line to the right (that is, about 150° in total), and the minor-axis refraction angle 48 covers a range of about 60° from the vertical line to the left and about 70° from the vertical line to the right (that is, about 130° in total).
- FIG. 10B shows a light distributions obtained when only the refractive elements 44 a, 44 b of the third type of lenses 54 are disposed on the substrate 30 , and it can be seen from light intensity profiles at the major-axis refraction angle 46 and the minor-axis refraction angle 48 that the light distributions obtained when only the refractive elements 44 a, 44 b of the third type of lenses 54 are disposed on the substrate 30 is asymmetrical. As can be seen from FIG.
- the major-axis refraction angle 46 covers a range of about 60° from the vertical line to the left and about 60° from the vertical line to the right (that is, about 120° in total), and the minor-axis refraction angle 48 covers a range of about 20° from the vertical line to the left and about 45° from the vertical line to the right (that is, about 65° in total).
- FIG. 10C shows a light distributions obtained when the refractive elements 42 a , 42 b of the second type of lenses 52 are combined with the refractive elements 44 a, 44 b of the third type of lenses 54 and are disposed on the substrate 30 .
- the major-axis refraction angle 46 covers a range of about 65° from the vertical line to the left and about 65° from the vertical line to the right (that is, about 130° in total)
- the minor-axis refraction angle 48 covers a range of about 50° from the vertical line to the left and about 50° from the vertical line to the right (that is, about 100° in total).
- light emitted by the LED lighting device can form different light distributions after passing through the composite lens plate.
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- General Physics & Mathematics (AREA)
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- Lenses (AREA)
Abstract
Description
- 1. Field of Invention
- The present invention relates to a lens plate, and more particularly to a composite lens plate.
- 2. Related Art
- With the increasing concern about energy saving and reduction of CO2 emission, many electrical appliances gradually develop toward high efficiency and low energy consumption. Especially, various lighting devices have developed from tungsten lamps and fluorescent lamps used in the past to currently adopted light emitting diodes (LEDs). Due to its small volume, high luminance, long service life, low power consumption and other properties, the LED has become a new generation lighting device. For example, in Taiwan, all traffic lights use LED lighting devices. Since an LED lighting device includes many LEDs, the traffic lights can achieve a warning effect even if several LEDs fail.
- In addition to the application in the traffic lights, the LED lighting devices are also commonly used in street lamps. When applied in street lamps, the LED lighting devices need to meet the requirements for high luminance, low power consumption, particular illumination range (also referred to as light distributions), and the like. For the particular illumination range, different local governments have different regulations on light distributions generated by the street lamps. Here, the so-called light distributions refers to an illumination range formed by light projected from a lighting device on a road surface.
- Several methods are usually used to enable an LED lighting device to meet the requirement for a particular light distributions. In a first method, a lens plate is disposed in front of the LED lighting device, so as to refract light emitted by all LEDs to a predetermined position. In a second method, LEDs are properly arranged so as to achieve a required light distributions. In the above two methods, when meeting the requirements for different light distributions, at least one mold needs to be designed for each light distributions, so as to fabricate a lens required by the light distributions. Therefore, when bidding for the manufacturing of street lamps for different road sections, a manufacturer needs to design different molds, which increases the cost and is not economical.
- Accordingly, the present invention is a composite lens plate applied in an LED lighting device.
- In an embodiment of the present invention, the composite lens plate is applied in an LED lighting device having a plurality of LEDs. The composite lens plate comprises a substrate and a plurality of refractive elements. The refractive elements are disposed on the substrate and one-to-one corresponding to the LEDs. The refractive elements guide light emitted by the corresponding LEDs. Each refractive element has a refractive property. The refractive elements are classified into at least two types of lenses according to the refractive property. The refractive elements of lenses of the same type have substantially the same refractive property. The refractive property of the refractive elements of lenses of one type is substantially different from the refractive property of the refractive elements of lenses of another type.
- In another embodiment of the present invention, the refractive elements are classified into three types of lenses according to the refractive property. The lenses comprise a first type of lenses, a second type of lenses, and a third type of lenses. The first type of lenses, the second type of lenses, and the third type of lenses have different refractive properties.
- A major-axis refraction angle of the refractive elements of the first type of lenses is 135° to 175°, and a minor-axis refraction angle of the refractive elements of the first type of lenses is 75° to 105°. A major-axis refraction angle of the refractive elements of the second type of lenses is 105° to 135°, and a minor-axis refraction angle of the refractive elements of the second type of lenses is 50° to 75°. A major-axis refraction angle of the refractive elements of the third type of lenses is 75° to 105°, and a minor-axis refraction angle of the refractive elements of the third type of lenses is 30° to 50°.
- In the present invention, through the combination and arrangement of the above refractive elements, light emitted by the LEDs can form different light distributions after passing through the composite lens plate.
- The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present invention, and wherein:
-
FIG. 1 is a schematic three-dimensional view of a composite lens plate according to an embodiment of the present invention; -
FIG. 2 is a schematic cross-sectional view taken along Line 2-2 inFIG. 1 ; -
FIG. 3A is a schematic plan view of a refractive element of a lens of the first type according to the present invention; -
FIG. 3B is a schematic cross-sectional view taken along Line 3B-3B inFIG. 3A ; -
FIG. 4A is a schematic three-dimensional view of a refractive element of a lens of the first type according to the present invention; -
FIG. 4B is a schematic cross-sectional view taken along Line 4B-4B inFIG. 4A ; -
FIG. 5 is a schematic cross-sectional view of an LED lighting device applying an embodiment of the present invention; -
FIG. 6 is a schematic view of a refractive property according to an embodiment of the present invention; -
FIG. 7 is a schematic view of a configuration of refractive elements according to an embodiment of the present invention; -
FIG. 8A is a schematic three-dimensional view of a lens plate according to another embodiment of the present invention; -
FIG. 8B is a schematic cross-sectional view taken alongLine 8B-8B inFIG. 8A ; -
FIG. 9A is a schematic three-dimensional view of a mold for the lens plate according to the embodiment of the present invention inFIG. 8A ; -
FIG. 9B is a schematic cross-sectional view taken along Line 9B-9B inFIG. 9A ; -
FIG. 10A is a schematic view of a first light distributions generated according to an embodiment of the present invention; -
FIG. 10B is a schematic view of a second light distributions generated according to an embodiment of the present invention; and -
FIG. 10C is a schematic view of a third light distributions generated according to an embodiment of the present invention. - The composite lens plate of the present invention is applied in an LED lighting device having a plurality of LEDs. The lens plate is used for adjusting a light distributions formed by light emitted by the LEDs. Particularly, the lens plate is applied in LED street lamps. Since many countries have regulations on the luminance and illumination range of street lamps, a manufacturer needs to fabricate corresponding lens plates for different areas, so as to comply with the regulations.
-
FIG. 1 is a schematic three-dimensional view of a composite lens plate according to an embodiment of the present invention. Referring toFIG. 1 , acomposite lens plate 20 comprises asubstrate 30 and a plurality ofrefractive elements refractive elements substrate 30 and one-to-one corresponding to the LEDs (to be detailed below). Therefractive elements lenses refractive elements refractive elements lenses 50 is substantially different from the refractive property of therefractive elements -
FIG. 2 is a schematic cross-sectional view taken along Line 2-2 inFIG. 1 . As can be seen fromFIG. 2 , therefractive elements lenses 50 have substantially the same cross-sectional shape. Therefractive elements lenses 52 have substantially the same cross-sectional shape. The cross-sectional shape of the refractive elements of the first type of lenses is substantially different from the cross-sectional shape of the refractive elements of the second type of lenses. For detailed structures of therefractive elements lenses 50 and therefractive elements lenses 52, reference is made toFIGS. 3A , 3B, 4A, and 4B. As can be seen fromFIGS. 3A and 3B , surfaces of therefractive elements 40 a of the first type oflenses 50 are each an elliptical curved surface. The curvature of the curved surface may be designed according to a light distributions generated by the LEDs. As can be seen fromFIGS. 4A and 4B , surfaces of therefractive elements 42 a of the second type oflenses 52 are each an elliptical curved surface having a cone-shaped concave top end. -
FIG. 5 is a schematic cross-sectional view of anLED lighting device 70 applying an embodiment of the present invention. Referring toFIG. 5 , theLED lighting device 70 comprises acircuit board 60 and acomposite lens plate 20. Thecomposite lens plate 20 is disposed on thecircuit board 60. Thecircuit board 60 has a plurality ofLEDs refractive elements LEDs - As can be seen from
FIG. 5 , since the shape of therefractive elements lenses 50 is different from that of therefractive elements lenses 52, light emitted by theLEDs lenses 50 and the second type of lenses 52 (which is the refractive property as described above). - For the illustration of the refractive property, reference is made to
FIG. 6 .FIG. 6 is a schematic view of a refractive property according to an embodiment of the present invention. As can be seen fromFIG. 6 , light emitted by theLED 62 passes through therefractive element 40 a, and then forms an ellipticallight distributions 67 on aprojection surface 68 at a particular distance there-from. In practical applications, thelight distributions 67 is not exactly elliptical, but instead, is somewhat elliptical. Meanwhile, different positions (areas inside the ellipse) may have different light intensities. Thelight distributions 67 has amajor axis 66 and aminor axis 65. In this figure, an angle between two dashed lines connecting therefractive element 40 a with two ends of themajor axis 66 is a major-axis refraction angle 46, and an angle between two dashed lines connecting therefractive element 40 a with two ends of theminor axis 65 is a minor-axis refraction angle 48. That is to say, the above refractive property comprises a major-axis refraction angle 46 and a minor-axis refraction angle 48. - The major-
axis refraction angle 46 of therefractive elements lenses 50 may be 135° to 175°, and preferably 140° to 160°. The minor-axis refraction angle 48 of therefractive elements lenses 50 may be 75° to 105°, and preferably 80° to 100°. - The major-
axis refraction angle 46 of therefractive elements lenses 52 may be 105° to 135°, and preferably 110° to 130°. The minor-axis refraction angle 48 of therefractive elements lenses 52 may be 50° to 75°, and preferably 45° to 65°. - Next, the
refractive elements substrate 30 corresponding to theLEDs FIG. 7 , therefractive elements substrate 30 approximately in the form of a ring. Definitely, corresponding to this embodiment, theLEDs refractive elements refractive elements -
FIG. 8A is a schematic three-dimensional view of a lens plate according to another embodiment of the present invention.FIG. 8B is a schematic cross-sectional view taken alongLine 8B-8B inFIG. 8A . Referring toFIGS. 8A and 8B , therefractive elements lenses lenses lenses 50, a second type oflenses 52, and a third type oflenses 54. The first type oflenses 50, the second type oflenses 52, and the third type oflenses 54 have different refractive properties. - The major-axis refraction angle of the
refractive elements lenses 54 is 75° to 105°, and preferably 85° to 95°. The minor-axis refraction angle of therefractive elements lenses 54 is 30° to 50°, and preferably 35° to 45°. Surfaces of therefractive elements lenses 54 are each a combination of a semi-elliptical curved surface and a columnar body. - Since the
refractive elements - Although the refractive properties of the
refractive elements refractive elements - Finally, for a mold for the lens plate according to the embodiment of the present invention in
FIG. 8A , reference is made toFIGS. 9A and 9B . Referring toFIGS. 9A and 9B , amold 96 comprises amale mold 97, afemale mold 98, andmold cores female mold 98 has a plurality ofopenings mold cores mold cores openings female mold 98 mounted with themold cores male mold 97, so as to form themold 96 for thecomposite lens plate 20 having differentrefractive elements 96. A manufacturer may select a combination of themold cores FIG. 9B according to the requirements of different areas, so as to mold acomposite lens plate 20 having a corresponding refractive property. In addition to the combination as shown inFIG. 9B , the manufacturer may also select a combination of themold cores mold cores composite lens plates 20, so as to meet the requirements for different light distributions. - For light distributions generated by different lens combinations, reference is made to
FIGS. 10A , 10B, and 10C.FIGS. 10A , 10B, and 10C are schematic views of light distributions generated by different lens combinations according to an embodiment of the present invention, in which the center of concentric circles represents the position of a light source (LEDs), each concentric circle represents a contour line indicating a light intensity (160, 240, or 320 candelas per 1000 lumens (cd/klm), as shown in the figures), and each radial line represents an angle with a vertical line passing through the light source (0°, 15°, 30°, 45°, 60°, 75°, 90°, or 105° as shown in the figures).FIG. 10A shows light intensity profiles obtained when therefractive elements lenses 50 are combined with therefractive elements lenses 54, in which two profiles respectively represent light intensity profiles at the major-axis refraction angle 46 (along the major axis) and at the minor-axis refraction angle 48 (along the minor axis). As can be seen fromFIG. 10A , the major-axis refraction angle 46 covers a range of about 75° from the vertical line to the left and about 75° from the vertical line to the right (that is, about 150° in total), and the minor-axis refraction angle 48 covers a range of about 60° from the vertical line to the left and about 70° from the vertical line to the right (that is, about 130° in total). -
FIG. 10B shows a light distributions obtained when only therefractive elements lenses 54 are disposed on thesubstrate 30, and it can be seen from light intensity profiles at the major-axis refraction angle 46 and the minor-axis refraction angle 48 that the light distributions obtained when only therefractive elements lenses 54 are disposed on thesubstrate 30 is asymmetrical. As can be seen fromFIG. 10B , the major-axis refraction angle 46 covers a range of about 60° from the vertical line to the left and about 60° from the vertical line to the right (that is, about 120° in total), and the minor-axis refraction angle 48 covers a range of about 20° from the vertical line to the left and about 45° from the vertical line to the right (that is, about 65° in total). -
FIG. 10C shows a light distributions obtained when therefractive elements lenses 52 are combined with therefractive elements lenses 54 and are disposed on thesubstrate 30. As can be seen fromFIG. 10C , the major-axis refraction angle 46 covers a range of about 65° from the vertical line to the left and about 65° from the vertical line to the right (that is, about 130° in total), and the minor-axis refraction angle 48 covers a range of about 50° from the vertical line to the left and about 50° from the vertical line to the right (that is, about 100° in total). - In the present invention, through the combination of the above refractive elements, light emitted by the LED lighting device can form different light distributions after passing through the composite lens plate.
Claims (21)
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US12/559,180 US7918590B1 (en) | 2009-09-14 | 2009-09-14 | Composite lens plate |
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