CN109578937B

CN109578937B - Anti-glare cover of lighting system

Info

Publication number: CN109578937B
Application number: CN201811596760.8A
Authority: CN
Inventors: 张发伟; 徐柏章
Original assignee: Ningbo Self Electronics Co Ltd
Current assignee: Ningbo Self Electronics Co Ltd
Priority date: 2018-12-25
Filing date: 2018-12-25
Publication date: 2024-05-10
Anticipated expiration: 2038-12-25
Also published as: CN109578937A

Abstract

The invention relates to an anti-dazzle cover of an illumination system, wherein the anti-dazzle cover (1) is positioned on one side of a light emitting surface (21) of a condensing lens (2) of the illumination system, the anti-dazzle cover (1) is cylindrical, a light emitting hole (11) is formed by penetrating the anti-dazzle cover (1) along the axis direction of the anti-dazzle cover, and the aperture of the light emitting hole (11) positioned on an emitting end surface (13A) of the anti-dazzle cover (1) is not larger than the minimum light emitting surface diameter of the condensing lens (2). The invention has the advantages of improving the anti-dazzle effect and the overall lighting effect.

Description

Anti-glare cover of lighting system

Technical Field

The invention relates to the field of optics, in particular to an anti-glare cover of a lighting system.

Background

The LED lamp has the advantages of low voltage, high light efficiency, pure luminous color and the like, and is widely applied to daily life. The LED as a point light source is often wrapped by a lamp housing, a cylinder, etc., and the light emission angle is generally not less than 180 degrees, which results in that a part of light source light is emitted and then is not projected to the surface to be irradiated, but is projected to the lamp housing, the cylinder, etc., and the part of light is often stray light. The stray light is easy to generate glare after being reflected, on one hand, the glare is easy to cause discomfort of eyes, on the other hand, the brightness of the lamp body is higher than the brightness of the surface to be irradiated, so that the attention of a user to an object to be irradiated is dispersed, and the real illumination guiding effect of the lamp body is greatly reduced.

In order to solve the problem, as disclosed in chinese patent No. CN102095131B, entitled "anti-glare LED spotlight", a condensing lens is disposed at the front end of an LED chip, and an anti-glare component is disposed at the front end of the condensing lens, where the anti-glare component includes a cover body with a uniform cross section, and absorbs divergent light rays at the edge of a light beam and ensures a maximum light extraction rate by making the height H of the cover body and the maximum light extraction surface diameter D of the condensing lens and the maximum light extraction angle θ of the condensing lens satisfy h=d/θ.

Although the anti-dazzle function can be better realized, certain requirements are met between the anti-dazzle component and the condensing lens, the design requirement is high, and if the design does not reach the standard, the anti-dazzle effect is greatly discounted, so that the effect result is not ideal.

Disclosure of Invention

In view of the above, an object of the present invention is to provide an anti-glare cover for an illumination system, which is simple in design and excellent in anti-glare effect.

In order to achieve the above object, the present invention provides an anti-glare cover for an illumination system, the anti-glare cover being positioned on a light-emitting surface side of a condenser lens of the illumination system, the anti-glare cover comprising:

the anti-dazzle cover is cylindrical, a light outlet hole is formed through the anti-dazzle cover along the axis direction of the anti-dazzle cover, and the aperture of the light outlet hole positioned on the emergent end face of the anti-dazzle cover is not larger than the minimum light outlet surface diameter of the condensing lens.

Preferably, a plurality of partition walls which are distributed at intervals are arranged in the anti-dazzle cover along the axis direction of the anti-dazzle cover, the partition walls are matched with the emergent end face to divide the anti-dazzle cover into a plurality of cavities in sequence, and the partition walls are sequentially communicated with the light emergent holes.

Preferably, the aperture of the light emitting hole gradually decreases with increasing distance between the light emitting hole and the light emitting surface of the condensing lens, and the maximum aperture of the light emitting hole is smaller than the maximum light emitting surface diameter of the condensing lens.

Preferably, the incident end of the anti-dazzle mask is in an opening shape, the aperture of the separation wall and the aperture of the incident side of the emergent end face are smaller than the aperture of the emergent side so as to form the light emergent hole, and the projection of the light emergent hole on the plane of the axis is in an isosceles trapezoid shape.

Preferably, the included angle between the waist edge of the isosceles trapezoid formed by projecting each light emitting hole on the plane and the light emitting direction is equal.

Preferably, the aperture of the light outlet hole on the exit end face of the anti-dazzle mask is not smaller than the aperture of the light outlet hole of the condensing lens.

Preferably, the inner wall of the anti-dazzle mask is a black frosted surface capable of absorbing scattered light

Preferably, the thickness of the emergent end face of the anti-dazzle shield is larger than that of the separation plate.

Preferably, the antiglare shield is cylindrical.

Compared with the prior art, the invention has the advantages that: the cylindrical anti-glare cover is simple in design, the axial light outlet hole is formed in the cylindrical anti-glare cover, the aperture of the light outlet hole in the light outlet end is smaller than or equal to the minimum diameter of the light outlet surface of the condensing lens, and the condensing lens can be prevented from being seen from the light outlet side, so that large-angle scattered light emitted by the outer edge of the light source is effectively prevented from entering the light outlet hole; the inner wall of the cover cylinder is divided into a plurality of cavities, and the aperture of the light outlet hole on the partition wall is gradually reduced along with the increase of the distance between the partition wall and the condensing lens, so that scattered light in the light from the front can be further filtered layer by layer, and glare is effectively prevented; the inner wall of the cover cylinder is designed to be a black frosted surface, can absorb scattered light, and is also beneficial to better ensuring the realization of the anti-dazzle function.

Drawings

FIG. 1 is a schematic view of an anti-glare cover for an illumination lens according to the present application assembled with the lens.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is a light path effect diagram of fig. 1.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

Fig. 1-3 show a preferred embodiment of the inventive anti-glare cover for an illumination lens, i.e. a construction diagram of the anti-glare cover after assembly with a condenser lens 2. The anti-glare cover 1 of the illumination lens is positioned on the light-emitting surface 21 side of the condenser lens 2, the anti-glare cover 1 is cylindrical, the anti-glare cover 1 is penetrated along the axial direction (as shown by a dotted line in fig. 1) to form a light-emitting hole 11, and the aperture of the light-emitting hole 11A far away from the light-emitting surface 21 of the condenser lens 2, that is, the aperture of the light-emitting hole 11A on the light-emitting end surface 13A of the anti-glare cover 1 is not larger than the minimum light-emitting surface diameter of the condenser lens 2. Of course, the antiglare shield 1 may be a square cylinder or the like, a polygonal prism or the like.

The condensing lens 2 mainly converges light in actual use, but due to the diversity of the light emitting angles, part of the light can be scattered, so that scattered light is formed, and the scattered light can form light spots around the condensing lens 2, so that the lamp body is too bright, and the irradiation effect is affected. When the aperture of the light exit hole 11A on the exit end face 13A of the anti-glare cover 1 is designed to be smaller than or equal to the minimum light exit face of the condenser lens 2, the light exit face 21 of the condenser lens 2 is not visible when seen from the exit end of the anti-glare cover 2 along the axial direction, so that scattered light formed by the light exit face 21 can be blocked and not emitted from the light exit hole 11A, thereby purifying light and ensuring the illumination effect.

In this embodiment, as shown in fig. 1, the light emitting surface 21 of the condensing lens 2 is concave, and for this type of lens, scattered light is easily generated, and when the aperture of the light emitting hole 11A is smaller than the minimum diameter of the light emitting surface 21, the scattered light generated by the light emitting surface 21 larger than the minimum diameter can be blocked. Of course, it should be noted that, in order to ensure that most of the light sources can still be used normally and effectively, the aperture of the light exit hole 11A cannot be smaller than the aperture of the light exit hole 22 of the condenser lens 2, so as to ensure the light utilization rate.

For better filtering out the scattered light, referring to fig. 2 and 3, the inside of the anti-glare cover 1 is provided with partition walls 13B and 13C distributed at intervals along the axial direction thereof, the partition walls 13B and 13C cooperate with the exit end face 13A to divide the inside of the anti-glare cover 1 into a plurality of cavities 12, and the light exit holes 11 are correspondingly formed on the partition walls 13B and 13C dividing the inside of the anti-glare cover 1 into a plurality of cavities 12 and the exit end face 13A. As shown in fig. 2, in the present embodiment, the inside of the antiglare shield 1 is divided into three cavities 12. Whether the depth of the cavity 12 is equal or not can be selected according to actual needs. The depth of the cavity 12 is also related to the thickness of the partition wall 13, and it is apparent that the thicker the partition wall 13, the shallower the depth of the cavity 12. Here, the exit end face 13A is used to separate the cavity 12A from the outside, and the exit end face 13A is thicker than the partition walls 13B and 13C, and at the same time, the path of formation of the light exit hole 11A on the partition wall 13A is also longer, as will be described later.

In order to further filter the astigmatism while ensuring that most of the light is emitted from the exit end face, the aperture of the light exit hole 11 gradually decreases as the distance between the light exit hole and the light exit surface 21 of the condenser lens 2 increases. As shown in fig. 2, the aperture of the light exit hole 11A at the exit end face 13A of the anti-glare cover 1 is smaller than the aperture of the light exit hole 11B, the aperture of the light exit hole 11B is obviously smaller than the aperture of the light exit hole 11C, and meanwhile, the aperture of the light exit hole 11C is smaller than the maximum diameter of the light exit face 21 of the condenser lens 2, and as shown in fig. 2, the incident face of the anti-glare cover 1 is in an open shape, namely in a cylinder shape with a missing end face, so that the condenser lens 2 is convenient to be placed in the anti-glare cover. In this way, the scattered light emitted by the condenser lens 2 can be blocked by the partition plate 13C at first, the scattered light which is not filtered by the partition plate 13C is emitted by the light emitting hole 11C and then blocked by the partition plate 13B again, and when passing through the light emitting hole 11A, the scattered light is blocked by the emitting end face 13A again, so that the scattered light can be well purified by filtering layer by layer, the glare effect of the lamp body is weakened, and the good lighting effect is ensured.

In order to ensure the light irradiation range, as an improvement, the aperture of the partition wall 13 and the incident side of the exit end face is smaller than the aperture of the exit side to form the light exit hole 11, and the projection of the light exit hole 11 on the plane of the axis is isosceles trapezoid, as can be seen in fig. 3. The aperture increases from the incident side to the emergent side, so that the propagation direction of most light rays can be well maintained, the propagation irradiation range of light is ensured, the suppression and the change of the aperture to the propagation path of the light rays are avoided, and the final light path effect diagram can be shown in fig. 3.

Preferably, the included angle between the waist edge of the isosceles trapezoid formed by projecting each light emitting hole 11 on the plane and the light emitting direction is equal, and fig. 2 specifically refers to the following.

In this embodiment, the inner wall of the anti-dazzle mask is a black frosted surface, and the black frosted surface can absorb light, so that the frosted surface is helpful for further absorbing scattered light, further absorbing and filtering the scattered light, and further enhancing the light purifying effect.

As described above, for ease of assembly, the incident end surface of the antiglare shield 1 is opened, so that the exit end of the condensing lens 2 can be accommodated in the cavity 12C. Of course, the light emitting surface 22 of the condensing lens 2 may be disposed at a certain distance from the incident end of the antiglare shield 1, and the specific installation design requirement is determined by practical requirements.

In addition to the above-described modifications, other similar modifications are also included in the scope of the present invention, and will not be described in detail herein. While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: many variations, modifications, substitutions, and alterations are possible in these embodiments without departing from the principles and spirit of the invention.

Claims

1. An anti-glare cover for an illumination system, wherein the anti-glare cover (1) is positioned on the light emergent surface (21) side of a condensing lens (2) of the illumination system, and is characterized in that:

the anti-dazzle cover (1) is cylindrical, the anti-dazzle cover (1) is communicated with the anti-dazzle cover along the axis direction to form a light outlet hole (11), and the aperture of the light outlet hole (11) positioned on the emergent end face (13A) of the anti-dazzle cover (1) is not larger than the minimum light outlet surface diameter of the condensing lens (2);

a plurality of partition walls (13) which are distributed at intervals are arranged in the anti-dazzle cover (1) along the axis direction of the anti-dazzle cover, the partition walls (13) are matched with the emergent end face (13A) to sequentially divide the anti-dazzle cover (1) into a plurality of cavities (12), and the partition walls (13) are sequentially communicated with each other to form the light emergent holes (11);

the aperture of the light emergent hole (11) gradually decreases along with the increase of the distance between the light emergent hole (11) and the light emergent surface (21) of the condensing lens (2), and the maximum aperture of the light emergent hole (11) is smaller than the maximum light emergent surface diameter of the condensing lens (2);

the aperture of the light emergent hole (11) on the emergent end face (13A) of the anti-dazzle mask (1) is not smaller than the aperture of the light emergent hole (22) of the condensing lens (2).

2. The antiglare shield of claim 1, wherein:

The incident end of the anti-dazzle mask (1) is in an opening shape, the separation wall (13) and the emergent end face (13A) are both arranged, the aperture of the incident side is smaller than that of the emergent side to form the light emergent hole (11), and the projection of the light emergent hole (11) on the plane of the axis is in an isosceles trapezoid shape.

3. The antiglare shield of claim 2, wherein:

The included angle between the waist edge of the isosceles trapezoid formed by the projection of each light emitting hole (11) on the plane and the light emitting direction is equal.

4. The antiglare shield of claim 1, wherein:

The inner wall of the anti-dazzle cover (1) is a black frosted surface capable of absorbing scattered light.

5. The antiglare shield of claim 1, wherein:

the thickness of the emergent end face (13A) of the anti-dazzle cover (1) is larger than that of the separation plates (13B, 13C).

6. The antiglare shield of claim 1, wherein:

The antiglare shield (1) is cylindrical.