CN101761866A - Optical lens and light emitting diode lighting device thereof - Google Patents

Abstract

The invention relates to an optical lens and a light-emitting diode lighting device thereof, wherein the optical lens is a transparent lens body and comprises a light source side optical surface, a lighting side optical surface and a peripheral part, wherein the light source side optical surface is designed and formed by utilizing a free-form surface formula and is used for facing a light-emitting diode light source so that light beams emitted by the light-emitting diode light source are incident into the optical lens through the light source side optical surface; the illumination side optical surface is designed and formed by utilizing a free-form surface formula and faces the illumination area, and when light beams emitted by the LED light source enter the optical lens through the light source side optical surface, the light beams are emitted to the illumination area forwards through the illumination side optical surface; an outer peripheral portion which is an outer peripheral portion of a non-optical surface on the lens body of the optical lens; and a lens array matched with an array of LED light sources is formed on an outer cover by utilizing a plurality of optical lenses in the same axial direction to form an LED illuminating device, so that the LED illuminating device is suitable for illumination of street lamps, car lamps or camera flash lamps and the like.

Description

Optical lens and its light-emitting diode lighting device

technical field

The present invention relates to an optical lens and its illuminating device, especially to an optical lens and its light-emitting diode illuminating device, which utilizes the surface definition of free form (surface definition of free form) to design the optical surface of the light source side and the illuminating side of the optical lens The optical surface is used to make the LED light source pass through the optical lens to generate uniform illumination and meet the requirements of special illumination light shape and the like.

Background technique

The use of light-emitting diodes (light-emitting diodes, referred to as LEDs) as the light source of lighting devices is an existing technology, and the application fields are quite extensive, such as flashlights, table lamps, car lights such as headlights and taillights, street lights, or others. Auxiliary lighting devices for electronic products, such as camera flashes, scanning lighting source devices, etc., mostly use a plurality of light-emitting diodes (LEDs) to form an array as a light source, and the above-mentioned LED array refers to a plurality of LEDs according to the lighting device. It needs to be arranged in a certain pattern (pattern), such as linear arrangement, matrix arrangement, concentric circular arrangement, etc., but not limited; and a light emitting diode (LED) basically includes: a base for carrying LED crystal grains and making the LED The crystal grain is connected to an external power supply, one or several LED grains are used to emit light after conducting electricity, and one or more layers of cover lens (cover lens) formed by light-transmitting resin or glass material, generally known as LED The first lens (firstlens) is used to cover the outside of the above-mentioned base and the LED crystal grain to form an LED assembly (LED assembly, referred to as LED in the present invention). When in use, the light emitted by the LED chip passes through the first lens ( first lens) and then projected outward.

In the application of LED, lighting devices for different purposes have different conditions of use. Taking street lamps as an example, street lamps generally require uniform and sufficient illuminance in the illuminated area (that is, the road surface), and the range of the illuminated area should preferably cover A rectangular area with a ratio of length (that is, the long axis, parallel to the direction of the road) and width (that is, the short axis, perpendicular to the direction of the road) of about 3:1, because the street lights are about 15 to 30 meters apart, and the height of the street lights is about 6 to 20 meters In order to make the LED light source or the LED array light source formed by several LEDs meet the above requirements, each LED has a basic first lens (first lens) in the packaging structure, and in the light projection direction of the LED, that is, the LED Generally, a second lens is arranged in front of the LED light source to improve the efficiency of the LED light source, such as increasing the effective illuminance (illumination unit: lux=lumen lm/m ² ) and adjusting the effective irradiation area and uniform illuminance of the LED light source. sex. However, traditional street lamps such as high-pressure sodium lamps have high luminous efficiency, but the effective illuminance of the lamps is low, mainly because the generated light shape (irradiated area) cannot effectively cover the required lighting area. waste.

Therefore, in the application technology of LED light sources, such as street lamps, it is indeed beneficial to develop an optical lens (second lens) that can produce near-rectangular light distribution patterns (rectangular light distribution patterns) and has high and uniform effective illuminance. Necessity.

Contents of the invention

The main purpose of the present invention is to provide an optical lens and its light-emitting diode lighting device, which uses the surface definition of free form (surface definition of free form) to design the optical surface of the light source side and the optical surface of the lighting side of the optical lens. The Anamorphic surface formula makes the optical surface design on the light source side form an axisymmetric shape, and the section along the long axis forms a concave shape, and uses the toric surface formula (Toric surface formula) to make the optical surface design on the lighting side form an axisymmetric shape. And along the long axis, the M-shape is concave in the middle and convex on both sides, so that the optical lens has different curvatures in different axial directions, so that when the optical lens is used with at least one LED light source, it can not only improve the LED The effective illuminance of the light source, and can achieve the use effect of producing uniform and nearly rectangular light-shaped intensity distribution (rectangular distribution patterns) in the illuminated area, so that it is suitable for lighting applications such as street lamps, car lights or photographic flash lamps, such as street lighting. The length of the major axis (parallel to the direction of the road) relative to the width of the minor axis (perpendicular to the direction of the road) is a rectangular light shape with a ratio of 3:1.

Another object of the present invention is to provide an optical lens and its illuminating device, which uses several optical lenses to form a lens array or other arrangement on a cover in the same axis, so as to be able to match an array of LED light sources Or other arrangements to form an LED lighting device to increase the effective illuminance of the LED light source and achieve a uniform and near-rectangular light shape in the illuminated area, which is suitable for lighting such as street lights, car lights, or photo flashes.

In order to achieve the above object, the present invention provides an optical lens for use with a light-emitting diode (LED) light source. The optical lens is a transparent lens body, which includes a light source side optical surface, an illumination side optical surface and a peripheral portion , the optical surface on the light source side is designed and formed by free-form surface formula, and is used to face at least one light emitting diode light source, so that the light beam emitted by the at least one light emitting diode light source is incident on the light source side optical surface In the optical lens; the optical surface on the illumination side is designed and formed by free-form surface formula, facing the irradiation area. When the light beam emitted by the LED light source enters the optical lens through the optical surface on the light source side, it passes through the optical face forward to the irradiation area; the peripheral part is the peripheral part of the non-optical surface on the lens body of the optical lens; wherein, the optical surface on the light source side and the optical surface on the illumination side both use a free-form surface The formula cooperates with the characteristics of the design, so that the light beam emitted by the light-emitting diode light source is refracted by the optical lens to produce a light shape intensity distribution with a length in the long axis direction and a width ratio in the short axis direction that is nearly rectangular in the irradiation area, wherein , the long-axis direction is the X-axis, and the short-axis direction is the Y-axis.

In order to achieve the above object, the present invention provides a light-emitting diode lighting device, which is an LED lighting device composed of the above-mentioned optical lens, which includes at least one optical lens, at least one LED light source and an outer cover, and the optical lens is a transparent A lens body, which includes a light source side optical surface, an illumination side optical surface and a peripheral portion, wherein the light source side optical surface and the illumination side optical surface are designed and formed using free-form surface formulas, and the peripheral portion is formed by Correspondingly embedded in a hole provided on the outer cover; the LED light source is facing the light source side optical surface of the optical lens; the outer cover is provided with a hole for an optical lens to be embedded in ; Wherein, the light beam emitted by the LED light source is incident into the optical lens through the optical surface of the light source side of the optical lens, and is emitted forward to the irradiation area through the optical surface of the light source side, and is optically transmitted by the light source side The surface and the optical surface on the lighting side are designed in conjunction with the free-form surface formula, so that the light beam emitted by the LED light source produces an intensity distribution with a length and width ratio of a nearly rectangular light shape in the irradiation area, wherein the long axis The direction is the X axis, and the short axis direction is the Y axis.

The beneficial effect of the present invention is that: the optical surface on the light source side and the optical surface on the lighting side of the optical lens are designed using the free-form surface formula, so that the LED light source can produce uniform illuminance through the optical lens and can meet the requirements of special lighting light shape and the like. .

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a viewing angle (viewing angle of the optical surface of the illumination side) of an embodiment of the optical lens of the present invention;

Fig. 2 is another perspective view (optical surface on the light source side) schematic perspective view of Fig. 1;

Fig. 3 is a schematic view of the front (X-Y axis plane) of an embodiment of the optical lens of the present invention (including the relevant dimensions of each part, in mm);

Fig. 4 is a schematic side sectional view of section line 4-4 (X-axis) in Fig. 3 (including relevant dimensions of each part, in mm);

Fig. 5 is a schematic side sectional view of section line 5-5 (Y axis) in Fig. 3 (including relevant dimensions of each part, in mm);

6 is a schematic cross-sectional view of the optical lens of the present invention used with an LED light source and an outer cover (including the relevant dimensions of each part, in mm);

7 is a schematic diagram of the use state of the optical lens of the present invention forming an LED optical lens array on the outer cover;

Fig. 8 is a schematic diagram illustrating that the LED light source of the present invention can generate projected light with different divergence angles in the X-axis and Y-axis directions after entering the optical lens at the same irradiation angle;

FIG. 9 is a schematic illustration of the rectangular light shapes generated by projected light with different divergence angles in FIG. 8 .

Explanation of reference signs: 1-optical lens; 10-optical surface on light source side; 11-central axis; 20-optical surface on lighting side; 21-concave; 22-convex; 23-central axis; 30-periphery; - LED light source; 201 - light beam; 202 - outgoing light; 3 - LED lighting device; 4 - outer cover; 41 - hole slot.

Detailed ways

In order to make the present invention more clear and detailed, the preferred embodiments are now listed and combined with the following diagrams, and the structure and technical characteristics of the present invention are described in detail as follows:

With reference to Fig. 1-5, it is respectively two different viewing angles (viewing angle of illumination side optical surface and light source side optical surface) three-dimensional schematic diagram of an embodiment of the optical lens of the present invention and three different sides (upper view, front view and side view) and Relevant dimension diagram. The optical lens 1 of the present invention is used in conjunction with at least one light emitting diode (LED) light source 2. As shown in FIG. Wherein, the optical surface 10 on the light source side is facing at least one light emitting diode (LED) light source 2 as shown in FIG. Inside: the illumination-side optical surface 20 is facing the irradiated object or the irradiation area, when the light beam emitted by the LED light source 2 enters the optical lens 1 through the light source-side optical surface 10, it can pass through the illumination-side optical surface 20 Shoot forward to the irradiated object or irradiated area.

The main features of the present invention are: the light source side optical surface 10 and the illumination side optical surface 20 of the optical lens 1 are all designed and formed by utilizing the surface definition of free form; The known technology currently includes a variety of different formulas for reference when designing the optical surface of the lens, such as the formula (1) anamorphic formula (Anamorphic formula) and formula (2) toric formula (Toric formula) shown below:

Formula (1) Anamorphic formula (distorted image formula):

$\mathrm{<span\; class="notranslate">\; Z</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Cx</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Cy</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="Y"\; filenames="H2008101765791E0000031.png,H2008101765791E0000032.png"\; state="\{\{state\}\}">Y</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Cx</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; Ky</span>}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Cy</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="Y"\; filenames="H2008101765791E0000031.png,H2008101765791E0000032.png"\; state="\{\{state\}\}">Y</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; +</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; 20</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \{</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \}</span>}^{\mathrm{<span\; class="notranslate">\; i</span>}}$

Formula (2) Toric formula (toric surface formula):

$\mathrm{<span\; class="notranslate">\; Zx</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Cx</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Cx</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; +</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; 20</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; Cyx</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; Cy</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Zx</span>}}$

$\mathrm{<span\; class="notranslate">\; Z</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; Zx</span>}<span\; class="notranslate">\; +</span>\frac{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Cyx</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="Y"\; filenames="H2008101765791E0000031.png,H2008101765791E0000032.png"\; state="\{\{state\}\}">Y</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Cyx</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="Y"\; filenames="H2008101765791E0000031.png,H2008101765791E0000032.png"\; state="\{\{state\}\}">Y</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}$

Among them, when designing the optical surface of the lens, the designer can change the optical parameters in the formula according to the needs of the optical surface of the lens, and use the computer software to conduct a simulation test, so that the designed optical lens can achieve the expected performance of the lens. The use effect; and the present invention utilizes the free surface formula (surface definition of free form) to design the light source side optical surface 10 and the illumination side optical surface 20 of the optical lens 1, so that the formed light source side optical surface 10 and illumination side optical surface 10 can be formed The optical surfaces 20 are all continuous curved surfaces, so as to facilitate the processing operation of the molding die for making the optical lens 1, that is, the processing of the molding die is easy, and it is beneficial to the optical surface of the light source side optical surface 10 and the lighting side optical surface 20. Surface accuracy, that is, the molding surface accuracy is relatively improved and can reach optical grade.

Taking the optical lens 1 of this embodiment as shown in Figures 1-5, wherein the optical surface 10 on the light source side is designed using an anamorphic formula to form an axis of symmetry, and the section along the long axis is inward. Concave shape, as shown in Figure 2; the optical surface 20 on the lighting side is designed to form an axisymmetric shape using a toric formula (Toricformula), and the two sides are convex 22 and the middle is concave 21 in the shape of M, and the light source side optical surface The surface 10 is correspondingly matched with the optical surface 20 on the lighting side; and a practical size of the optical lens 1 of the embodiment shown in Figures 3-5 is the inventor (designer) for the use of street lamps, such as meeting the needs of street lamps. The length of the X-axis (that is, the direction of the long axis, parallel to the direction of the road) relative to the width of the Y-axis (that is, the direction of the short axis, perpendicular to the direction of the road) has a rectangular light shape requirement and uniformity requirement of 3:1, and the optical shape in the formula is changed. Parameters are simulated by computer software to design and complete an actual product of an optical lens 1 that can achieve the expected use effect (such as a 3:1 rectangular light shape) of the lens; as for the optical lens 1, it is a non-optical The rest of the surface, such as the peripheral portion 30 of the optical surface 10 on the light source side and the optical surface 20 on the lighting side as shown in Fig. The optical lens 1 of this embodiment shown in -5 is designed as a rectangular lens body, and its peripheral portion 30 is mainly designed according to the shape and structure of the assembly hole 41 provided on the outer cover 4 used by the lighting device 3 .

And the optical lens 1 of the present invention is mainly through the corresponding cooperation relationship between the light source side optical surface 10 and the lighting side optical surface 20, so that the optical lens 1 can be positioned on the X axis (i.e. the long axis direction, parallel to the road direction) and the Y axis (i.e. the short axis direction). , perpendicular to the direction of the road) have different curvatures, and then the light beam 201 emitted by the LED light source 2 can produce refraction effects with different divergence angles on the X-axis and Y-axis, so as to form rectangular light shapes with different aspect ratios; as shown in FIG. 8 As shown in the illustration, when the light beam 201 emitted by an LED light source 2 is incident at fixed incident angles θx and θy and then emerges to the irradiation area (display area) A through the optical lens 1, since the optical lens 1 is on the X-axis and There are different curvatures on the Y-axis, so the outgoing light 202 with different divergence angles can be generated in the directions of the X-axis and the Y-axis. As shown in FIG. Therefore, at the position of the irradiation area A, the irradiation range Lx formed by the outgoing light 202 on the X-axis is larger than the irradiation range Ly formed by the outgoing light 202 on the Y-axis, that is, the irradiation area A can be The intensity distribution (rectangular light distribution patterns) of the rectangular light pattern that produces a aspect ratio about Lx: Ly is as shown in Figure 9; Take the optical lens 1 of the present embodiment as shown in Figure 1-5 as an example, and refer to As shown in the lighting device 3 of FIG. 6 , the optical lens 1 of this embodiment is an optical lens designed for use in street lamps, so the light beam 201 emitted by the LED light source 2 can produce the required X-axis length of the street lamp after being refracted by the optical lens 1 ( That is, the long axis direction, parallel to the road direction) relative to the Y-axis width (that is, the short axis direction, perpendicular to the road direction) is a near-rectangular light shape of about 3:1, so as to meet the requirements of a specific ratio of near-rectangular light shape required by street lights and Uniformity requirements; As for the aspect ratio relationship of the near-rectangular light shape, each optical parameter in the formula can be changed according to the use needs of the optical lens 1, and the simulation test is done by computer software, so that the designed optical lens can achieve the required The best use effect of the above-mentioned optical lens 1. A plurality of identical optical lenses can be used to coaxially form a lens array on an outer cover, which can be used with an LED light source array to form an LED lighting device, which is suitable for lighting such as street lamps, car lights or photographic flash lamps. use.

The light-emitting diode (LED) lighting device 3 of the present invention, as shown in Figures 6 and 7, includes at least one LED light source 2, at least one optical lens 1 and a housing (holder) 4, wherein the shape of the LED lighting device 3, The size, assembly type, and the corresponding relationship between the LED light source and the optical lens 1 (for example, one LED light source corresponds to one optical lens 1) are not limited, and can be designed according to different needs of the application field, such as for street lamps, flashlights, Different designs are provided for different applications such as table lamps, car lights such as headlights and taillights, or auxiliary lighting devices for other electronic products such as camera flashes and scanning lighting light source devices, and this embodiment is shown in Figure 7. or similar items as examples, but not intended to limit the present invention. Referring to FIGS. 6 and 7, the optical lens 1 of the present invention is used to match at least one light emitting diode (LED) light source 2. As shown in FIG. Wherein the optical lens 1 is the embodiment shown in Figure 3-5, that is, an optical lens designed for the use of street lamps, wherein the LED light source 2 is a concave surface arranged on the optical surface 10 on the light source side. In the curved surface; and the present invention can further utilize several optical lenses 1 to be coaxial, that is, the X-axis/Y-axis of the optical lens 1 is in the same direction, and form a lens array on a larger-sized outer cover 4 such as Figure 7 shows a 6 by 6 lens array, but not limited to, it can be matched with an LED light source array formed by a plurality of LED light sources 2 to form an LED lighting device 3, so as to reduce the process loss of the LED light source and improve the performance of the LED light source. The effective illuminance of the LED light source can achieve the effect of producing a uniform and nearly rectangular light shape in the illuminated area; and the embodiment 3 of the LED lighting device formed by a 6 by 6 lens array as shown in Figure 7 is designed for street lamps. But the arrangement of the lens array is not limited, and it can be changed according to different needs, such as arrays of different numbers such as 5 by 4, 2 by 1 or other non-array arrangements such as linear arrangement and concentric circular arrangement , Staggered arrangement, etc., to be suitable for other lighting purposes such as car lights or photo flashes.

The outer cover (holder) 4 can be arranged in a sealed manner on the periphery of the lighting side of the LED light source 2 (not shown in the figure). As for the shape, assembly type and size of the outer cover 4, there are no restrictions, and it can be used according to different needs in the application field. And coordinate design, as described outer cover 4 can utilize plastics injection molding process to make one-piece molding structure as shown in Figure 6, 7, also can be the combined structure (figure not shown) that is made up of multiple things; The outer cover 4 is provided with at least one hole 41, such as a hole 41 is set on the outer cover 4 as shown in Figure 6 or a plurality of holes 41 are set on the outer cover 4 as shown in Figure 7 and form a hole array; An optical lens 1 can be respectively embedded in 41 to form a lens array such as a 6 by 6 lens array as shown in FIG. A light emitting diode (LED) lighting device 3 is formed. With the present embodiment as shown in Figure 1-7 again, the appearance and size (i.e. the peripheral part 30) of described optical lens 1 is to cooperate with the design of hole groove 41 set on the outer cover 4, so that optical lens 1 It can be correspondingly embedded in the hole groove 41 and combined into one body, and the combination method is not limited, it can be fixed by adhesive bonding and it is better to achieve a waterproof effect.

Referring again to Figures 6 and 7, when in use, the light beams emitted by each LED light source 2 in the LED light source array can correspond to pass through an optical lens 1 in the optical lens array on the outer cover 4 and then project outward, except that the optical lens 1 can be achieved. In addition to the expected light shape effect, the effective illuminance of the LED light source can be improved, and the optical efficiency and use efficiency of the LED lighting device 3 can be improved. And because the LED lighting device 3 of the present invention is first provided with at least one hole 41 on the outer cover 4 for correspondingly embedding an optical lens 1, the outer cover 4 and the optical lens 1 are made separately, and the shape of the hole 41 is basically According to the matching design of the corresponding embedded optical lens 1, therefore, the design, manufacture and production process of the molding die of the optical lens 1 used in the present invention can be relatively simple, and the optical surface of the optical lens 1 can also be easily achieved. The optimized design is beneficial to improve the optical efficiency of the optical lens 1 and relatively simplifies the assembly operation of the LED lighting device 3 of the present invention.

The above are only preferred embodiments of the present invention, and are only illustrative, not restrictive, of the present invention. Those with ordinary knowledge in the technical field understand that many changes, modifications, and even equivalent changes can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims (9)

1. an optical lens is to use in order to the collocation LED source, and described optical lens is a transparent mirror lamellar body, and it comprises a light source-side optical face, an illumination side optical surface and an outer part, it is characterized in that:

Described light source-side optical face is to utilize the design of free form surface formula to form, and in order to face at least one LED source, the light beam that described at least one LED source is sent is incident in the described optical lens via described light source-side optical face;

Described illumination side optical surface, be to utilize the design of free form surface formula to form, be towards irradiation area, when light beam that described LED source sent via described light source-side optical face after being incident in the described optical lens, via described illumination side optical surface forward outgoing to irradiation area;

Described outer part is non-optical a periphery on the eyeglass body of described optical lens;

Wherein, all utilize the characteristic of free form surface formula matching design by described light source-side optical face and described illumination side optical surface, make light beam that LED source sends produce the length of a long axis direction and be the intensity distributions of the light shape of rectangle at irradiation area in the width ratio of short-axis direction via described optical lens refraction back, wherein, described long axis direction is an X-axis, and described short-axis direction is a Y-axis.

2. optical lens according to claim 1 is characterized in that, described light source-side optical face is to utilize anamorphosis formula design as follows in the free form surface formula:

$Z=\frac{\left(\mathrm{Cx}\right)X^2+\left(\mathrm{Cy}\right)Y^2}{1+\sqrt{1-(1+\mathrm{Kx}){\left(\mathrm{Cx}\right)}^2{X}^2-(1+\mathrm{Ky}){\left(\mathrm{Cy}\right)}^2{Y}^2}}+\underset{i=1}{\overset{20}{\mathrm{\&Sigma;}}}{A}_{2i}{\{(1-B_{2i})X^2+(1+B_{2i})Y^2\}}^i$

And forming an axial symmetry, and prolonging major axis and cuing open to being the light source-side optical face of concave shape.

3. optical lens according to claim 1 is characterized in that, described illumination side optical surface is to utilize double-curved surface formula design as follows in the free form surface formula:

$\mathrm{Zx}=\frac{\left(\mathrm{Cx}\right)X^2}{1+\sqrt{1-(1+\mathrm{Kx}){\left(\mathrm{Cx}\right)}^2{X}^2}}+\underset{i=1}{\overset{20}{\mathrm{\&Sigma;}}}{A}_i{X}^i,$ $\mathrm{Cyx}=\frac{1}{(1/\mathrm{Cy})-\mathrm{Zx}}$

$Z=\mathrm{Zx}+\frac{\left(\mathrm{Cyx}\right)Y^2}{1+\sqrt{1-{\left(\mathrm{Cyx}\right)}^2{Y}^2}}$

And forming an axial symmetry, and prolonging major axis and cuing open to the illumination side optical surface that is the M shape of middle indent both sides evagination.

4. optical lens according to claim 1, it is characterized in that, described optical lens the ratio of the length of the rectangular light shape that irradiation area produced, width be by change free form surface formula in each optical parametric, and carry out simulated test by computer software and design.

5. optical lens according to claim 1 is characterized in that, described optical lens is 3: 1 in length, the width ratio of the rectangular light shape that irradiation area produced.

6. light emitting diode illuminating apparatus is to utilize described any optical lens of claim 1 to 6 and the light emitting diode illuminating apparatus that constitutes, and it comprises at least one optical lens, at least one led light source and an outer cover, it is characterized in that:

Described optical lens, it is a transparent mirror lamellar body, it comprises a light source-side optical face, an illumination side optical surface and an outer part, wherein said light source-side optical face and described illumination side optical surface are to utilize the design of free form surface formula to form, and are embedded in the hole slot set on described outer cover with correspondence by described outer part;

Described led light source is the light source-side optical face in the face of described optical lens;

Described outer cover, the hole slot which is provided with is embedded wherein for an optical lens;

Wherein, the light beam that described led light source sent be incident in the described optical lens via the light source-side optical face of described optical lens and via described illumination side optical surface forward outgoing to irradiation area, and utilize the characteristic of free form surface formula matching design by described light source-side optical face and described illumination side optical surface, make light beam that described led light source sends produce a length and width ratio is the intensity distributions of rectangular light shape at irradiation area, wherein, described long axis direction is an X-axis, and described short-axis direction is a Y-axis.

7. light emitting diode illuminating apparatus according to claim 6 is characterized in that, the outer part of described optical lens be cooperate on the outer cover hole slot so that described optical lens correspondence be embedded in described hole slot and be combined into one.

8. light emitting diode illuminating apparatus according to claim 6 is characterized in that, the hole slot that described outer cover is provided with is a plurality of, and described plurality of holes groove forms a hole slot array.

9. light emitting diode illuminating apparatus according to claim 8 is characterized in that, described hole slot array is one 6 to take advantage of 6 hole slot array.

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