KR20110102634A - Optical lens and lighting apparautus - Google Patents

Optical lens and lighting apparautus Download PDF

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Publication number
KR20110102634A
KR20110102634A KR1020100021736A KR20100021736A KR20110102634A KR 20110102634 A KR20110102634 A KR 20110102634A KR 1020100021736 A KR1020100021736 A KR 1020100021736A KR 20100021736 A KR20100021736 A KR 20100021736A KR 20110102634 A KR20110102634 A KR 20110102634A
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KR
South Korea
Prior art keywords
convex lens
shape
optical axis
light
angle
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Application number
KR1020100021736A
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Korean (ko)
Inventor
테츠오 아리요시
Original Assignee
삼성엘이디 주식회사
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Priority to KR1020100021736A priority Critical patent/KR20110102634A/en
Publication of KR20110102634A publication Critical patent/KR20110102634A/en

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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
    • 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
    • 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
    • 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
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • 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
    • F21V5/048—Refractors for light sources of lens shape the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
    • 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
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • 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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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The present invention relates to an optical lens and a lighting apparatus using the same. One aspect of the present invention has a convex lens shape having an empty inside as a basic structure, and an inner surface and an outer surface are provided so as to form a sawtooth shape, respectively. When the line connecting the center of the lens and the center of the convex lens is called an optical axis, light having an angle of θ 1 with respect to the optical axis among the light incident on the inner surface passes through the tooth portion of the inner surface of the tooth shape. It is the optical axis and an angle θ 2 larger than the θ 1 and provides an optical lens and an optical axis angle while passing through the teeth of the outer surface of the saw-tooth shape that is greater than the θ 3 θ 2.
In the case of using the optical lens proposed in the present invention, since the angle formed with the optical axis is increased while the light incident from the light source is emitted to the outside, the directing angle of the light source can be improved.

Description

Optical Lens and Lighting Apparautus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical lens and a lighting apparatus using the same, and more particularly, to an lighting apparatus having a light distribution curve suitable for use as indoor lighting by using an optical lens having an improved directivity angle.

A light emitting diode (LED), which is a kind of semiconductor light source, is a semiconductor device capable of generating light of various colors based on recombination of electrons and holes at junctions of p and n-type semiconductors when a current is applied. Such light emitting diodes have a number of advantages, such as long life, low power, excellent initial driving characteristics, and high vibration resistance, compared to filament-based light sources. In particular, group III nitride semiconductors capable of emitting light in a blue short wavelength region have been in the spotlight.

Recently, attempts have been made to replace conventional indoor lighting devices such as incandescent and fluorescent lamps using such light emitting diodes. However, in the case of a light emitting diode, light is emitted only in a specific direction, rather than uniformly emitted in all directions, and a direction angle is typically about 120 °. These light distribution characteristics show a large difference in comparison with incandescent lamps or fluorescent lamps that emit light in all directions, and thus are restricted from being used as indoor lighting devices. Therefore, in the case of a lighting device using a light emitting diode, a method that can be designed to have a light distribution characteristic similar to the existing indoor lighting device as possible as needed.

One object of the present invention is to provide an optical lens having a shape capable of improving the directivity of a light source, and furthermore, to provide an illumination device having light distribution characteristics similar to incandescent or fluorescent lamps using such an optical lens.

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

The inner structure of the hollow convex lens has a basic structure, and the inner surface and the outer surface are provided so as to form a tooth shape, respectively, when the line connecting the center of the convex lens and the center of the convex lens is called an optical axis, Of the light incident on the surface, the light having an angle of θ 1 with the optical axis passes through the toothed portion of the inner surface of the tooth shape, and the angle formed with the optical axis becomes θ 2 which is larger than the θ 1 . An optical lens is provided in which an angle formed with the optical axis while passing through a toothed portion is θ 3 , which is larger than θ 2 .

In one embodiment of the present invention, θ 3 may be two or more times greater than θ 1 .

In one embodiment of the present invention, the toothed end of the inner surface and the outer surface of the sawtooth shape may be formed at a position corresponding to each other.

In this case, the toothed inner surface and the toothed portion of the outer surface may be provided such that the width of the convex lens becomes smaller toward the center of the convex lens.

In one embodiment of the present invention, the convex lens may have a hemispherical shape with an empty inside.

In one embodiment of the present invention, the convex lens may have a semi-cylindrical shape with an empty inside.

In this case, the semi-cylinder may have a shape in which positions corresponding to the top and bottom surfaces are open.

In one embodiment of the present invention, the portion forming the toothed portion in the inner surface of the sawtooth may have a planar shape.

On the other hand, another aspect of the present invention,

A light source and a hollow convex lens shape are provided as a basic structure, and the light source is disposed at the center of the convex lens, and the inner and outer surfaces are provided to form a sawtooth shape, respectively, and the center of the convex lens is provided. When the line connecting the central portion of the convex lens is called an optical axis, light having an angle of θ 1 with respect to the optical axis among the light incident on the inner surface passes through the tooth portion of the inner surface of the sawtooth shape and forms an angle with the optical axis. the above and θ is greater than θ 2 1 provides a lighting device including an optical lens and an optical axis angle while passing through the teeth of the outer surface of the saw-tooth shape that is greater than the θ 3 θ 2.

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

In one embodiment of the present invention, the convex lens may have a hemispherical shape with an empty inside.

In one embodiment of the present invention, the light source includes a plurality of light emitting diodes, the convex lens has a semi-cylindrical shape with an empty inside, and the plurality of light emitting diodes may be arranged along a centerline inside the semi-cylinder. have.

In one embodiment of the present invention, it may further include a heat dissipation structure disposed under the optical lens and the light source.

In one embodiment of the present invention, the light emitted to the outside through the optical lens may have a direction angle of 200 ~ 260 °.

In the case of using the optical lens proposed in the present invention, since the angle formed with the optical axis is increased while the light incident from the light source is emitted to the outside, the directing angle of the light source can be improved. Furthermore, according to the present invention, it is possible to obtain a lighting device having a light distribution characteristic similar to an incandescent lamp or a fluorescent lamp by using such an optical lens.

1 and 2 schematically show an optical lens according to an embodiment of the present invention, and correspond to a perspective view and a cross-sectional view, respectively.
3 schematically shows a traveling path of light passing through the optical lens according to the present embodiment.
4 is a cross-sectional view schematically showing a lighting device using the optical lens proposed in the present invention.
FIG. 5 simulates and shows a light distribution curve obtained from the lighting apparatus according to the embodiment of FIG. 4.
6 is a perspective view schematically showing an optical lens according to another embodiment of the present invention.
FIG. 7 is a perspective view schematically illustrating a lighting device using the optical lens of FIG. 6.

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

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

1 and 2 schematically show an optical lens according to an embodiment of the present invention, and correspond to a perspective view and a cross-sectional view, respectively. In this case, FIGS. 1A and 1B show the optical lens as viewed from below and above, respectively. 3 schematically shows a traveling path of light passing through the optical lens according to the present embodiment. First, referring to FIGS. 1 and 2, the optical lens 100 provided in the present embodiment has a convex lens shape having a hollow interior, and the inner surface 101 and the outer surface 102 are toothed, respectively. It is provided to form a shape. In this case, the convex lens corresponds to a shape similar to a hemisphere with an empty interior. The sawtooth shape is composed of a toothed portion 103 and a toothed end portion 104 formed at a position where they are connected to each other. These tooth shapes formed on the inner and outer surfaces 101 and 102 of the optical lens 100 are emitted through the outer surface 102 with respect to light incident through the inner surface 101 to increase the angle with the optical axis. will be.

Referring to FIG. 3, light emitted from the center C 1 inside the optical lens 100 or the convex lens is incident on the inner surface 101, and the angle formed by the optical axis a is (θ). 1 ) In this case, the optical axis a may be defined as a line connecting the center C 1 inside the convex lens and the center C 2 of the convex lens. Light incident on the inner surface 101 passes through the tooth portion 103 and becomes θ 2 having an angle with the optical axis a greater than θ 1 . Further, the light having an angle of θ 2 with the optical axis a passes through the teeth 103 of the outer surface 102, and the angle with the optical axis a becomes θ 3, which is larger than θ 2 . As such, the angle of the light emitted from the inside by the sawtooth-shaped optical lens 100 with the optical axis a may be greatly increased. That is, the light starting from the center C 1 inside the optical lens 100 follows a path away from the optical axis a while passing through the optical lens 100, and for this purpose, the inner surface 101 and the outer surface of the sawtooth shape are formed. The toothed portion 103 and the toothed end portion 104 of the 102 are formed at positions corresponding to each other, and furthermore, the toothed portion 103 of the inner surface 101 and the outer surface 101 is formed of the optical lens 100. It is preferable that the width of the optical lens 100 becomes smaller toward the center C 2 of . In addition, it is preferable that the part which comprises the tooth | gear part 103 in the inner surface 101 and the outer surface 102 has a planar shape.

As in the present embodiment, the angle between the optical axis a and the external emission light is increased through the optical lens 100 to exhibit light distribution characteristics similar to those of a conventional incandescent lamp or a fluorescent lamp using a light emitting diode light source. Specifically, the intensity cd of light emitted from the light emitting diode light source has a distribution of l (θ) = cosθ with respect to the angle θ, and the total luminous flux lm can be obtained as follows.

Figure pat00001

On the other hand, the angular distribution, l (θ`) of uniform intensity all in the range of 0 to 360 ° has a constant value (a), whereby the total luminous flux is as follows.

Figure pat00002

In this case, when θ` = 2θ and a = 1/4, the two equations coincide with each other. Therefore, it can be interpreted that the light emission distribution similar to an incandescent lamp or a fluorescent lamp can be obtained if the angle of light emitted from the light emitting diode is twice the optical axis. Specifically, in FIG. 3, θ 3 is equal to or greater than θ 1 . It is desirable to be. Considering that the light emitting diode has a light emitting angle of about 100 to 130 °, when the optical lens 100 according to the present embodiment is used, the angle of view is increased to about 200 to 260 °. You will get However, the angle of inclination does not necessarily need to be increased by more than two times, and the degree of elevation may vary somewhat depending on the design conditions of the optical lens 100, and thus the extent of the elevation may be less than two times.

4 is a cross-sectional view schematically showing a lighting device using the optical lens proposed in the present invention. FIG. 5 simulates and shows a light distribution curve obtained from the lighting apparatus according to the embodiment of FIG. 4. In the lighting device 200 according to the present embodiment, the circuit board 202 is disposed on the heat dissipation structure 203, and the light source 201 is mounted on the circuit board 202. In this case, the light source 201 may include a plurality of light emitting diodes. The optical lens 100 described in the above embodiments is disposed above the light source 201, and the center of the light source 201 may be located at the center of the inside of the optical lens 100. The driving circuit unit 204 for operating the light source 201 is disposed inside the heat dissipation structure 203, and the electrical connection unit 205 is formed to be connected thereto. The lighting device 200 proposed in the present embodiment has a shape similar to that of a conventional incandescent lamp, and merely illustrates an example thereof and may be modified into various shapes as necessary. Referring to FIG. 5, in the case of the lighting device 200, the sawtooth-shaped optical lens 100 has an increased orientation angle than the original orientation angle of the light source 201, and the present simulation result (arrows indicated by dotted lines). The orientation angle was about 210 °. This is a result of increased than the general orientation angle of the light emitting diode 100 ~ 130 °, it can be said to be a range suitable for use as indoor lighting.

On the other hand, the sawtooth-shaped optical lens may have a shape that can be used in a structure similar to a conventional fluorescent lamp. 6 is a perspective view schematically showing an optical lens according to another embodiment of the present invention, and FIG. 7 is a perspective view schematically showing a lighting device using the optical lens of FIG. 6. Referring to FIG. 6, the optical lens 300 has a convex lens shape, specifically, a semi-cylindrical shape having an empty inside. In this case, the semi-cylindrical shape has an open position corresponding to the top and bottom surfaces thereof. In addition to the shape difference of the basic structure, the inner surface and the outer surface have a sawtooth shape, whereby improving the directing angle of the light is the same as described in the embodiment of FIG. As the optical lens 300 has such a semi-cylindrical shape, it may be combined with a light emitting diode and used similarly to a conventional fluorescent lamp.

Specifically, as shown in FIG. 7, in the lighting apparatus 400, a circuit board 302 is disposed on the heat dissipation structure 303, and a plurality of light sources 301 are mounted on the circuit board 302. In this case, the plurality of light sources 301 may be arranged along a centerline inside the optical lens 300 having a semi-cylindrical shape, and the optical lens 300 is disposed on the plurality of light sources 301 to provide a plurality of light sources 301. Can increase the directing angle of the light emitted from each. An electrical connection part 305 electrically connected to the circuit board 302 may be formed in the lateral direction of the optical lens 301, and a driving circuit part (not shown) may be provided inside the heat dissipation structure 303. The lighting device 400 having the same structure as the present embodiment has a shape similar to that of a conventional fluorescent lamp, and is suitable for use as indoor lighting because it can secure a sufficient directivity angle as described above.

The present invention is not limited by the above-described embodiment and the accompanying drawings, but by the appended claims. Therefore, it will be apparent to those skilled in the art that various forms of substitution, modification, and alteration are possible without departing from the technical spirit of the present invention described in the claims, and the appended claims. Will belong to the technical spirit described in.

100: optical lens 101: inner surface
102: outer surface 103: tooth part
104: tooth end 200: lighting device
201: light source 202: circuit board
203: heat dissipation structure 204: drive circuit portion
205: electrical connection

Claims (14)

The basic structure has a hollow convex lens shape, the inner surface and the outer surface are provided to form a sawtooth shape, respectively,
When the line connecting the center of the convex lens and the center of the convex lens is called an optical axis, light having an angle θ 1 of the light incident on the inner surface passes through the toothed portion of the inner surface of the tooth shape. While the angle formed with the optical axis becomes θ 2 which is greater than the θ 1 , and the angle formed with the optical axis becomes θ 3 which is larger than the θ 2 while passing through a toothed portion of the tooth-shaped outer surface.
The method of claim 1,
The θ 3 is at least twice as large as the θ 1 .
The method of claim 1,
The toothed end of the toothed inner surface and the outer surface is formed in a position corresponding to each other.
The method of claim 3,
The tooth-shaped inner surface and the toothed portion of the outer surface are provided such that the width of the convex lens becomes smaller toward the center of the convex lens.
The method of claim 1,
The convex lens has a hemispherical shape with an empty inside.
The method of claim 1,
The convex lens has a semi-cylindrical shape with an empty inside.
The method of claim 6,
The semi-cylindrical optical lens, characterized in that the position corresponding to the top and bottom surfaces open.
The method of claim 1,
An optical lens, characterized in that the portion forming the toothed portion on the inner surface of the sawtooth shape.
Light source; And
It has a basic convex lens shape having a hollow inside, the light source is positioned in the center of the convex lens, the inner surface and the outer surface are provided to form a sawtooth shape, respectively, the center and the inside of the convex lens When the line connecting the center of the convex lens is called an optical axis, light having an angle of θ 1 with respect to the optical axis among the light incident on the inner surface passes through a tooth portion of the inner surface of the tooth shape, and the angle formed with the optical axis is θ 2 is larger than θ 1, and an optical lens and an optical axis angle while passing through the teeth of the outer surface of the saw-tooth shape that is greater than the θ 3 θ 2;
Lighting device comprising a.
10. The method of claim 9,
The light source comprises a plurality of light emitting diodes.
10. The method of claim 9,
The convex lens has a hemispherical shape with an empty inside.
10. The method of claim 9,
The light source includes a plurality of light emitting diodes, the convex lens has a semi-cylindrical shape with an empty inside, and the plurality of light emitting diodes are arranged along a center line inside the semi-cylinder.
10. The method of claim 9,
And a heat dissipation structure disposed under the optical lens and the light source.
10. The method of claim 9,
The light emitted from the outside through the optical lens is a directing angle of 200 ~ 260 ° characterized in that the illumination device.
KR1020100021736A 2010-03-11 2010-03-11 Optical lens and lighting apparautus KR20110102634A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106482012A (en) * 2016-12-02 2017-03-08 山西山地新源科技有限公司 A kind of LED light source lens
CN106907650A (en) * 2017-04-17 2017-06-30 泉州师范学院 The greeting lamp optical element and its method for designing of a kind of generation ring of light combination pattern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106482012A (en) * 2016-12-02 2017-03-08 山西山地新源科技有限公司 A kind of LED light source lens
CN106907650A (en) * 2017-04-17 2017-06-30 泉州师范学院 The greeting lamp optical element and its method for designing of a kind of generation ring of light combination pattern

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