CN116480981A - Lighting module, lighting device and lighting method - Google Patents

Abstract

The invention discloses a lighting module, which comprises a base, an LED element and a Fresnel lens, wherein the LED element is arranged in the center of the base, the base extends along the light emitting direction of the LED element to form a bracket, and the Fresnel lens is arranged on the bracket; the base, the bracket and the Fresnel lens form a first cavity together; light rays emitted by the LED element enter the first cavity and are collimated and emitted after passing through the Fresnel lens. In the lighting module, the light emitted by the LED element is collimated and emitted, and the anti-dazzle performance is achieved. The invention also provides a lighting device comprising the lighting module, and the emergent range and the emergent angle can be adjusted by matching the light control piece with the lighting module. The invention also provides an illumination method based on the illumination device.

Description

Lighting module, lighting device and lighting method

Technical Field

The invention relates to the technical field of LED light distribution, in particular to a lighting module, a lighting device and a lighting method.

Background

The projection lamp can project light into a wall or a specific illumination target according to a specific shape, can be suitable for different illumination scenes and meets various illumination requirements.

The optical module of the projection lamp mostly adopts a TIR lens form, and the TIR lens has the defects that although the central light is strong, the TIR lens has poor anti-dazzle performance, for example, (1) if anti-dazzle is needed, a honeycomb net is needed to be added in the lamp body or anti-dazzle fins are added outside the lamp body; (2) TIR lens is difficult to achieve clear and sharp cut-off, meets the requirements of lighting scenes with high light control requirements,

there are also projecting lamps, wall washing lamps and lanterns such as light projector, wall washing lamp adopt fresnel lens to improve the projecting effect of facula, like prior art discloses a projecting lamp, including LED lamp pearl, reflector cup, big fresnel lens and little fresnel lens, big fresnel lens sets up on the rim of a cup of reflector cup, and the LED lamp pearl is located the focus of big fresnel lens, little fresnel lens sets up on big fresnel lens, and little fresnel lens is located the condensing point of reflector cup, carries out collimation with the light on the condensing point of reflector cup. The light projection lamp adopts the Fresnel lenses with different sizes to treat the light, so that the beam angle is reduced, and the luminous flux is improved. However, in the application occasions of light spot requirements, especially square light spot light distribution, the application requirements can not be well met.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a lighting module which can collimate and emit light rays emitted by an LED element and has anti-dazzle performance; the invention also provides a lighting device comprising the lighting module, and the emergent range and the emergent angle can be adjusted by matching the light control piece with the lighting module. The invention also provides an illumination method based on the illumination module and the illumination device.

In order to achieve the above object, the present invention provides the following technical solutions:

the lighting module comprises a base, an LED element and a Fresnel lens, wherein the LED element is arranged in the center of the base, the base extends along the light emitting direction of the LED element to form a bracket, and the Fresnel lens is arranged on the bracket; the base, the bracket and the Fresnel lens form a first cavity together; light rays emitted by the LED element enter the first cavity and are collimated and emitted after passing through the Fresnel lens.

Further, the Fresnel lens comprises a first light control body facing the LED element and a second light control body facing away from the LED element, and the first light control body is provided with a light incident surface.

Further, the light incident surface is a smooth cambered surface or a plane parallel to the base.

Further, the second light control body comprises a protruding portion arranged in the middle and a sawtooth portion arranged on the outer side of the protruding portion, and a sawtooth opening of the sawtooth portion faces towards or is far away from the protruding portion.

Further, the fresnel lens has a rotationally symmetrical structure, and the center of the LED element passes through the rotational symmetry axis of the fresnel lens and is located at the focal point of the fresnel lens.

Further, in the section of the lighting module, a rectangular coordinate system is established by taking the center o of the LED element as an origin, taking a horizontal axis passing through the center o as an x axis and taking a vertical axis passing through the center o as a y axis; the included angle between the light emitted by the LED element and the y axis is alpha, and the coordinate A of the incident point of the light entering the second light control body is (x 1, y 1); after refraction, the coordinates of an emergent point B emergent from the second light control piece are (x 2, y 2);

the incident point a (x 1, y 1) has the following relation:

x1＝h*tan[α]；

the emission point B (x 2, y 2) has the following relation:

the slope at exit point B (x 2, y 2) is:

where n is the refractive index of the fresnel lens.

Further, a third light control body is arranged on the inner side surface of the bracket; the third light control body is coated with black paint, and the surface of the third light control body is frosted.

The invention also provides a lighting device, which comprises a shell, a light control piece and the lighting modules, wherein the plurality of the lighting modules are arranged at the bottom of the shell to form a lighting array; the light control piece is arranged above the illumination array; the shell, the light control piece and the lighting module form a second cavity together.

Further, the light control piece is provided with a transparent part and a shading part, and the shading part is screen printed with ink.

Further, the interval between the adjacent lighting modules is between 0 and 5 mm.

The invention also provides an illumination method, which adopts the illumination device and comprises the following steps:

the LED element emits light which respectively enters the third light control body and the first light control body through the first cavity,

the light entering the third light control body is mostly absorbed, and the light entering the first light control body after being diffusely reflected;

the light entering the first light control body is collimated and emitted after passing through the second light control body, and enters the second cavity;

the light of the second cavity is partially shielded by the shading part; part of the light passes through the transparent part of the light control part and exits according to a preset light outlet.

Based on the technical scheme, the invention has the following technical effects:

(1) According to the lighting module provided by the invention, the first light control body and the second light control body of the Fresnel lens are combined with the third light control body of the bracket to jointly process the light rays emitted by the LED element, so that the light rays are collimated and emergent, and glare is reduced.

(2) According to the lighting device provided by the invention, the light control piece is adopted to further control the light emitted by the lighting module, and the emergent angle, luminous flux and light spot area of the light can be controlled by adjusting the size proportion of the shading part and the transparent part.

(3) According to the illumination method, the illumination range can be effectively controlled by utilizing the mutual coordination of the illumination module and the light control piece, and the anti-dazzle device has excellent anti-dazzle performance.

Drawings

Fig. 1 is a cross-sectional view of a lighting module of the present invention.

Fig. 2 is a schematic structural view of the fresnel lens of the present invention.

Fig. 3 is a schematic structural view of the base and the bracket of the present invention.

Fig. 4 is a cross-sectional view of an LED element and fresnel lens of the present invention.

Fig. 5 is a cross-sectional view of the lighting device of the present invention.

Fig. 6 is a schematic structural diagram of a light control member according to the present invention.

Fig. 7 is a schematic view of the illumination device of the present invention at a viewing angle.

Fig. 8 is a schematic view of the lighting device of the present invention at another viewing angle.

Fig. 9 is a flow chart of the illumination method of the present invention.

Detailed Description

In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

Fig. 1 is a cross-sectional view of an illumination module according to the present embodiment, fig. 2 is a schematic structural view of a fresnel lens according to the present embodiment, fig. 3 is a schematic structural view of a base and a bracket according to the present embodiment, and referring to fig. 1 to 3, an illumination module 100 is used as a light control unit to form an illumination array according to requirements, so as to assemble a lamp product. The lighting module 100 includes a base 1, an LED element 2, and a fresnel lens 3, wherein the base 1 has a flat base surface, and the LED element 2 is disposed at the center of the base surface of the base 1 and emits light. The LED element 2 may be a COB light source or an SMD patch light source. The LED element 2 has a light source center, whether it be a COB light source or an SMD patch light source. In this embodiment, a COB light source is taken as an example to describe, the COB light source is a high-power integrated area light source, and according to the attached LED chip, the light area and the external dimension are determined.

Along the light-emitting direction of the LED element 2, the base 1 extends upward to form a holder 4, and the fresnel lens 3 is disposed on the holder 4. As shown in fig. 1, the base 1, the bracket 4 and the fresnel lens 3 together form a first cavity 11 of the lighting module; the light emitted by the LED element 2 enters the first cavity 11 and is collimated out after being processed by the fresnel lens 3.

As shown in fig. 2, the fresnel lens 3 of the present embodiment is a collimating light-controlling member having an arc-shaped sheet structure, and the fresnel lens 3 includes a first light-controlling body 31 and a second light-controlling body 32, wherein the first light-controlling body 31 is disposed towards the LED element 2, and a light-incident surface 311 is disposed on the first light-controlling body 31. The light emitted from the LED element 2 is refracted for the first time when entering the light incident surface 311. In some embodiments, the light incident surface 311 is a smooth arc surface; in other embodiments, the light incident surface 311 may be a plane, and the plane is parallel to the base surface of the base 1.

The second light control body 32 is disposed away from the LED element 2, and a lens light emitting surface 321 is disposed on the second light control body 32. After the light is refracted for the first time through the light incident surface 311 of the first light control body 31, the light enters the fresnel lens 3 body and is collimated and emitted from the lens light emitting surface 321.

The second light control body 32 has a plurality of curved surfaces. The second light control body 32 includes a protruding portion 322 and a sawtooth portion 323, wherein the protruding portion 322 is located in the middle of the second light control body 32, the sawtooth portion 323 is disposed on the outer side of the protruding portion 322, and a sawtooth opening of the sawtooth portion 323 faces toward or is far away from the protruding portion 322. In the present embodiment, the serration openings of the serration 323 face the protrusion 322.

In this way, the continuous undulating light-emitting surface with the raised portions 322 and the saw-tooth portions 323 is provided with a plurality of light-controlling peaks and a plurality of light-controlling valleys, which can improve the light-gathering degree, correct the light path, improve the direction of the emitted light, and further collimate and emit the light to achieve the preset light-emitting effect.

Fig. 4 is a sectional view of the LED element and the fresnel lens of the present embodiment, and referring to fig. 4, the fresnel lens 3 has a rotationally symmetrical structure having a rotational symmetry axis x, i.e., a cross section of the fresnel lens 3 forms an arc-like structure around the rotational symmetry axis x. The center o of the LED element 2 passes through the rotational symmetry axis x of the fresnel lens 3 and coincides with the focal point of the fresnel lens. The rotational symmetry axis x is also located on the light emitting surface of the LED element 2.

In the sectional view, a rectangular coordinate system is established with the center o of the LED element 2 as the origin, the horizontal axis passing through the center o as the x-axis (the x-axis is also the rotational symmetry axis), and the axis perpendicular to the rotational symmetry axis x as the y-axis (the y-axis is also the axis perpendicular to the light emitting surface).

As shown in fig. 4, the included angle between the light emitted by the LED element 2 and the y-axis is α, and the coordinate of the incident point a of the light entering the second light control body 32 is (x 1, y 1); after refraction, the coordinates of the exit point B from the second light control element 32 are (x 2, y 2). The incident point a (x 1, y 1) has the following relation:

x1＝h*tan[α]；

the emission point B (x 2, y 2) has the following relation:

the slope at exit point B (x 2, y 2) is:

n is the refractive index of the fresnel lens. The fresnel lens 3 may be made of transparent PMMA, transparent PC or glass, and the fresnel lens of this embodiment is preferably optically transparent PMMA.

Returning to fig. 3, in order to fit the fresnel lens 3, the support 4 is provided with an inclined stage 40 at the upper edge so that the fresnel lens is fitted into the support 4. A third light control body 41 is arranged on the inner side surface of the bracket 4, the third light control body 41 is coated with black paint, and the surface is frosted. Since the third light control body 41 is a black light absorption portion, most of the light emitted from the LED element 2 is absorbed when entering the third light control body 41, and a small part of the light is diffusely reflected, so that the emission of stray light is reduced.

The rest light enters the fresnel lens 3 through the light incident surface 311, and the light incident on the fresnel lens 3 is emitted from the light emergent surface 321 because the fresnel lens 3 has a rotationally symmetrical structure, if the LED element is a point light source, all the light will be collimated and emitted from the light emergent surface.

In practical applications, the LED element may not be a point light source, but a COB light source or other SMD patch light source having a certain light emitting area. Because of the surface light source, the light rays are not completely emitted in the vertical direction, and part of the light rays are emitted at a smaller inclination angle. In some embodiments, the tilt angle is typically 3-5 ° and also substantially achieves a collimated exit effect when the ratio of the distance between the fresnel lens and the LED element to the size of the LED element is above 10 times.

In the lighting module of this embodiment, the first light control body and the second light control body of the fresnel lens, in combination with the third light control body of the bracket, jointly process the light emitted by the LED element, so that the light is collimated and emitted, and glare is reduced.

Example 2

Fig. 5 is a cross-sectional view of the lighting device of the present embodiment, as shown in fig. 5, a lighting device includes a housing 200 and a light control member 300, and the lighting module 100 of embodiment 1. The plurality of lighting modules 100 are disposed at the bottom of the housing 200 to form a lighting array 400, and the light controlling member 300 is disposed above the lighting array 400. The housing 200, the light controlling member 300, and the lighting module 100 together form a second cavity 201.

Fig. 6 is a schematic structural diagram of a light control member according to the present embodiment, referring to fig. 6, the light control member 300 may be a light control glass, the light control member 300 is provided with a transparent portion 301 and a light shielding portion 302, and ink is silk-screened on the light shielding portion 302. The silk-screened ink on the upper surface of the shading part 302 is opaque ink, and light cannot pass through the place covered by the ink; where the ink is not covered only, the light will be transmitted. In some embodiments, the transparent portion 301 and the light shielding portion 302 may be provided such that the positions of both may be adjusted, i.e., the size of the transparent portion 301 may be increased by moving the light shielding portion 302.

Fig. 7 is a schematic view of the lighting device according to the present embodiment at one view angle; fig. 8 is a schematic view of the lighting device of the present embodiment at another view angle, as shown in fig. 7 and 8, after the light emitted from the lighting module 100 enters the second cavity 201, the light shielding portion 302 shields the light, and the rest of the light is emitted from the transparent portion 301 to the outside. By adjusting the size ratio of the light shielding portion 302 and the transparent portion 301, the outgoing angle of light, luminous flux, and spot area can be controlled.

Returning to fig. 5, the inner surface of the housing 200 may also be treated as a black coating to prevent the residual light from being reflected from the inner surface of the housing to form glare. The length of the shell can be designed and adjusted according to the needs, and the length of the shell is generally set to be 1-1.5m.

In the lighting array 400, the lighting modules 100 are arranged in a straight line at the bottom of the housing 200, and a distance d between adjacent lighting modules is between 0 and 5 mm. Such as too large a spacing between adjacent illumination modules, can easily cause the spots to form faults in the x-axis direction (horizontal direction).

In the y-axis direction (vertical direction), unwanted light is blocked due to the arrangement of the light management member 300. The light transmitting portion 301 of the non-silk-screened ink, i.e., the portion of the light management member 300 interposed between AB, determines the spot area size and the light exit angle in the y-axis direction (vertical direction).

The light control piece 300 is adopted to be matched with the light control treatment of the lighting module 100, so that controllable square light spots can be obtained. The illumination modules 100 in the illumination array 400 are arranged linearly, so that the light distribution in the x-axis direction (horizontal direction) can be controlled; by controlling the size of the light transmitting portion 301, the illumination range in the y-axis direction (vertical direction) can be controlled; based on this, the spot size in the x-axis direction (horizontal direction) and the y-axis direction (vertical direction) can be flexibly adjusted. Since the light transmitting part and the light shielding part have obvious light spot separation lines, the light spot edges are cut off, and the light and shade distinction is obvious.

Example 3

Fig. 9 is a flowchart of an illumination method of the present embodiment, and as shown in fig. 9, the present embodiment provides an illumination method, which adopts the above-mentioned illumination device and illumination module, and specifically includes the following steps:

and 101, the LED element emits light which enters the third light control body and the first light control body respectively through the first cavity.

102. The light entering the third light control body is mostly absorbed, and the light entering the first light control body after being diffusely reflected.

103. The light entering the first light control body is collimated and emitted after passing through the second light control body, and enters the second cavity.

104. The light of the second cavity is partially shielded by the shading part; part of the light passes through the transparent part of the light control part and exits according to a preset light outlet.

The LED element emits light, and after entering the third light control body, most of the light is absorbed, and the small part of the light is diffusely reflected and enters the first light control body. The third light control body is positioned on the bracket of the base, and black paint is coated on the inner side surface of the third light control body, so that most of light rays can be absorbed after entering the third light control body, and a small part of light rays are diffusely reflected and enter the first light control body; the light entering the first light control body is collimated and emitted after passing through the second light control body, and enters the second cavity; on the second light control body of the Fresnel lens, the light passes through the continuous undulating light emitting surface formed by connecting the bulge part and the sawtooth part, so that the light concentration degree can be improved, the light path can be corrected, the direction of the emitted light can be improved, and the light can be collimated and emitted; the light of the second cavity is partially shielded by the shading part; part of the light passes through the transparent part of the light control part and exits according to a preset light outlet. The light shielding part shields light rays, and the rest of the light rays are emitted from the transparent part to the outside. By adjusting the size ratio of the light shielding part and the transparent part, the emergent angle, luminous flux and light spot area of the light can be controlled, so that the preset light emergent effect is obtained.

The illumination method utilizes the mutual coordination of the illumination module and the light control piece, can effectively control the illumination range, and has excellent anti-dazzle performance.

The foregoing is merely illustrative and explanatory of the invention as it is described in more detail and is not thereby to be construed as limiting the scope of the invention. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention, and that these obvious alternatives fall within the scope of the invention.

Claims (10)

1. The illumination module is characterized by comprising a base, an LED element and a Fresnel lens, wherein the LED element is arranged at the center of the base, the base extends along the light emitting direction of the LED element to form a bracket, and the Fresnel lens is arranged on the bracket; the base, the bracket and the Fresnel lens form a first cavity together; light rays emitted by the LED element enter the first cavity and are collimated and emitted after passing through the Fresnel lens.

2. A lighting module as recited in claim 1, wherein the fresnel lens comprises a first light management body that faces the LED element and a second light management body that faces away from the LED element, the first light management body having a light entry surface.

3. A lighting module as recited in claim 2, wherein the light entrance surface is a smooth arc surface or a plane parallel to the base.

4. A lighting module as recited in claim 2, wherein the second light control body comprises a convex portion disposed in the middle, and a sawtooth portion disposed outside the convex portion, wherein a sawtooth opening of the sawtooth portion faces toward or away from the convex portion.

5. A lighting module as recited in claim 2, wherein the fresnel lens has a rotationally symmetric structure, and a center of the LED element passes through an axis of rotational symmetry of the fresnel lens and is located at a focal point of the fresnel lens.

6. A lighting module as recited in claim 1, wherein in said lighting module cross-section, a rectangular coordinate system is established with a center o of the LED element as an origin, a horizontal axis passing through the center o as an x-axis, and a vertical axis passing through the center o as a y-axis; the included angle between the light emitted by the LED element and the y axis is alpha, and the coordinate A of the incident point of the light entering the second light control body is (x 1, y 1); after refraction, the coordinates of an emergent point B emergent from the second light control piece are (x 2, y 2); the incident point a (x 1, y 1) has the following relation:

x1＝h*tan[α]；

the emission point B (x 2, y 2) has the following relation:

the slope at exit point B (x 2, y 2) is:

where n is the refractive index of the fresnel lens.

7. A lighting module as recited in claim 1, wherein an inside surface of the bracket is provided with a third light control body; the third light control body is coated with black paint, and the surface of the third light control body is frosted.

8. The lighting device is characterized by comprising a shell, a light control piece and the lighting modules according to any one of claims 1-7, wherein a plurality of the lighting modules are arranged at the bottom of the shell to form a lighting array; the light control piece is arranged above the illumination array; the shell, the light control piece and the lighting module form a second cavity together.

9. A lighting device as recited in claim 8, wherein said light control element is provided with a transparent portion and a light shielding portion, said light shielding portion being silk-screened with ink.

10. A lighting method, characterized in that the lighting device according to claim 8 is used, comprising the steps of:

the LED element emits light which respectively enters the third light control body and the first light control body through the first cavity,

the light entering the third light control body is mostly absorbed, and the light entering the first light control body after being diffusely reflected;

the light entering the first light control body is collimated and emitted after passing through the second light control body, and enters the second cavity;

the light of the second cavity is partially shielded by the shading part; part of the light passes through the transparent part of the light control part and exits according to a preset light outlet.