CN216203137U - LED emergency lighting lens according with European standard - Google Patents

Abstract

The utility model provides an LED emergency lighting lens conforming to the European standard, which comprises a main body, wherein the main body is provided with a rotational symmetry axis, the main body comprises an accommodating cavity capable of accommodating an LED light source, an incident surface and an emergent surface which form a light inlet cavity, and a medium positioned between the incident surface and the emergent surface, the incident surface and the emergent surface are both free curved surfaces, the incident surface and the emergent surface are respectively rotationally symmetrical along the rotational symmetry axis, the thickness of the medium positioned at the rotational symmetry axis is the minimum, and the thickness of the medium is increased along with the distance from the rotational symmetry axis. According to the utility model, the incident surface and the emergent surface are both free-form surfaces, and the thickness of the medium is increased along with the distance from the rotation symmetry axis, so that the diffusion angle is larger on the premise of meeting the glare limitation, the lamp arrangement distance can be increased, the number of lamps can be reduced, and the cost can be reduced.

Description

LED emergency lighting lens according with European standard

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of lamps, in particular to an LED emergency lighting lens which meets European standards.

[ background of the utility model ]

The LED (light emitting diode) with the name of "green lighting" is receiving attention, and compared with the traditional light source, the LED has the characteristics of green environmental protection, small size, low power consumption, long service life and the like, and is very suitable for being used as a light source of a lamp. The optical design of the light source becomes particularly important since a complete lighting fixture must meet the application requirements for lighting optics. For most LED light sources, if the light distribution design is not carried out, the light emitted by the light source cannot be reasonably and effectively utilized, and the light distribution design does not meet the illumination requirements of human beings on various application occasions. The optical design of the LED lighting fixture comprises primary light distribution and secondary light distribution. The process of packaging the LED chip into the LED light source is defined as primary light distribution, which determines the light emitting angle, the magnitude of luminous flux, the light intensity distribution, the color temperature range, and the like of the light source chip. When the LED light source is applied to a specific product, the distribution conditions of the light emitting efficiency, the light intensity and the color temperature of the whole system also need to be designed, and the design is called secondary light distribution.

Emergency lighting is an important safety facility for modern public and industrial buildings, which is closely related to personal safety and building safety. When a fire or other disasters happen to a building and the power supply is interrupted, emergency lighting plays an important role in evacuation of personnel, fire rescue work, important production, continuous operation of work or necessary operation and disposal.

The european standard EN-1838 (european union emergency lighting standard) makes a clear specification on the minimum illuminance and uniformity of emergency lighting on different occasions, and especially has strict requirements on anti-glare.

As shown in fig. 1, the conventional emergency lighting secondary light distribution only adopts a lens structure with typical angles (30 °, 60 °, 90 °, and 120 °), and adopts lambertian-like distribution light distribution, which has the disadvantages of unreasonable energy distribution, such as small light-emitting angle, small irradiation range, and the like. As shown in fig. 2, the conventional emergency lighting has a small light-emitting angle, which results in low illumination of the overlapped area between two lamps and is prone to dark areas.

Therefore, there is a need to provide a new LED emergency lighting lens meeting the european standard to solve the above technical problems.

[ Utility model ] content

The utility model aims to provide an anti-glare LED emergency lighting lens with a larger divergence angle, which conforms to the European standard, so as to solve the problems in the related art.

In order to achieve the above object, the present invention provides an LED emergency lighting lens conforming to the euro standard, which includes a main body having a rotational symmetry axis, wherein the main body includes an accommodating cavity capable of accommodating an LED light source, an incident surface and an exit surface forming a light inlet cavity, and a medium located between the incident surface and the exit surface, the incident surface and the exit surface are both free curved surfaces, and the incident surface and the exit surface are respectively rotationally symmetric along the rotational symmetry axis, the thickness of the medium located at the rotational symmetry axis is the smallest, and the thickness of the medium increases as the distance from the rotational symmetry axis increases.

Preferably, the accommodating cavity is communicated with the light inlet cavity.

More preferably, the body further comprises a fixing surface.

Preferably, a light ray a of the LED light source enters the medium from the incident surface and then exits from the exit surface, and a radian θ is formed between the light ray b and the rotational symmetry axis Z, and the radian is larger than the radian θ of the light ray b

The light intensity of the light ray b satisfies the following relationship:

when theta is more than 0 and less than pi/3, I (theta) is I_0*(-16.236*cos⁴θ+51.11*cos³θ-60.41*cos²Theta + 31.336-cos theta-A), A is a constant, and A is more than or equal to 4.70 and less than or equal to 4.80;

when pi/3 < theta < pi/2, I (theta) ═ I₀*(28.558*cos³θ-11.634*cos²Theta + 1.4042-cos theta + B), B is a constant, B is more than or equal to 0.01 and less than or equal to 0.03,

I₀the central light intensity of the LED light source is positioned on the rotational symmetry axis Z after the LED light source is emitted through the medium and the emitting surface; A. the value of B depends on the characteristics of the LED light source.

The utility model has the technical effects that: all adopt free-form surface through incident surface, emergent surface, and the thickness of medium along with becoming far away and grow with the distance of rotational symmetry axle to anti-dazzle, and have bigger angle of divergence can increase the cloth lamp distance, reduce the cloth lamp quantity, reduce cost, and lens account for the ratio through the light energy that rationally reduces the lamps and lanterns below, increase effective irradiation area.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a light intensity profile for conventional emergency lighting at typical angles (30, 60, 90, 120);

FIG. 2 is a schematic view of overlapping illumination of two conventional emergency lights;

FIG. 3 is a cross-sectional view of a European standard compliant LED emergency lighting lens 100 of the present invention;

fig. 4 is a schematic diagram of an embodiment of a euro-compliant LED emergency lighting lens 100 of the present invention;

FIG. 5 is a light intensity profile for an emergency lighting system employing the present invention;

fig. 6 is a schematic view of overlapping illumination of two emergency lighting systems employing the present invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and 2, a lens with typical angles (30 °, 60 °, 90 °, and 120 °) is used in conventional emergency lighting, which has the disadvantages of unreasonable energy distribution, such as small light-emitting angle and small illumination range, and the overlapping area between two lamps has low illumination and is prone to dark areas.

As shown in fig. 3 and 4, the LED emergency lighting lens 100 according to the european standard of the present invention includes a main body 1, and the main body 1 has a rotational symmetry axis Z. The main body 1 comprises a containing cavity 10 capable of containing the LED light source 2, an incident surface 11 forming an light inlet cavity 20, an emergent surface 12 and a medium 13 positioned between the incident surface 11 and the emergent surface 12. The incident surface 11 and the exit surface 12 are both free-form surfaces, and the incident surface 11 and the exit surface 12 are respectively rotationally symmetric along the rotational symmetry axis Z. The light inlet cavity 20 is communicated with the accommodating cavity 10 and can accommodate light.

The medium 13 may be made of PMMA, PC or glass. And the thickness D of the medium 13 is varied, the thickness of the medium 13 at the rotational symmetry axis Z is a minimum value D1, and the thickness D of the medium 13 becomes larger as the distance from the rotational symmetry axis becomes longer. In the actual process, the minimum D1 can be 0.8-1 mm. By such a design, the incident surface 11 and the exit surface 12 are made to act like a concave lens, so that light is scattered and has a larger divergence angle.

The incident surface 11 is used for receiving the light emitted by the LED light source 2 and controlling the angle of the light of the LED light source 2 entering the medium 13.

The body 1 further comprises a fixing surface 14 on which an adhesive can be applied to fix the mounting to the emergency lighting system.

As shown in fig. 4, in the implementation of the LED emergency lighting lens 100 according to the european standard, a light ray a enters the medium 13 from the incident surface 11, and then a light ray b exits from the exit surface 12. The ray b forms an arc theta with the axis of rotational symmetry Z.

The light intensity of the light ray b satisfies the following relationship:

when theta is more than 0 and less than pi/3, I (theta) is I_0*(-16.236*cos⁴θ+51.11*cos³θ-60.41*cos²Theta + 31.336-cos theta-A), A is a constant, and A is more than or equal to 4.70 and less than or equal to 4.80;

when pi/3 < theta < pi/2, I (theta) ═ I₀*(28.558*cos³θ-11.634*cos²Theta + 1.4042-cos theta + B), B is a constant, B is more than or equal to 0.01 and less than or equal to 0.03,

I₀the LED light source 2 is positioned after being emitted through the medium 13 and the emitting surface 12The central light intensity of the rotational symmetry axis Z; A. the value of B depends on the characteristics of the LED light source.

As shown in fig. 5, the light intensity distribution diagram of the emergency lighting system of the present invention shows that the light energy distribution is distributed in a batwing shape, the light energy distribution is symmetrical and uniform, the divergence angle can reach more than 130 degrees, and the energy ratio right under the center of the lamp is reduced, so that the glare is greatly reduced, and the utilization rate of the light is improved.

As shown in fig. 6, the overlapping illumination of two emergency illumination systems using the emergency illumination system of the present invention is schematically shown, and after the divergence angle is increased to 130 °, the overlapping area of the two emergency illumination lamps is increased, and the illumination intensity is high, so that the distance between the two emergency illumination lamps is increased, and the cost is saved.

The incident surface 11 and the emergent surface 12 of the LED emergency lighting lens 100 in accordance with the European standard are both free-form surfaces, and the thickness of the medium 13 is increased along with the distance from the rotational symmetry axis Z, so that the lens has a larger divergence angle on the premise of meeting the glare limitation, the lamp arrangement distance can be increased, the number of lamps can be reduced, and the cost is reduced, and the lens increases the effective irradiation area by reasonably reducing the light energy ratio below the lamp, thereby being beneficial to improving the uniformity and enhancing the visual use experience of users, and under the same condition, the total luminous flux of the lamp using the lens is 20-30% lower than that required by the prior art, so that the required power of an emergency power supply is reduced, and the cost is saved.

The LED emergency lighting lens 100 according to the euro standard of the present invention can be installed not only in an emergency lighting system but also in a general lighting system.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions.

Claims (4)

1. An LED emergency lighting lens according to European Standard comprising a body having an axis of rotational symmetry, characterized in that: the main body comprises an accommodating cavity capable of accommodating an LED light source, an incident surface and an emergent surface which form a light inlet cavity, and a medium located between the incident surface and the emergent surface, the incident surface and the emergent surface are both free curved surfaces, the incident surface and the emergent surface are respectively in rotational symmetry along the rotational symmetry axis, the thickness of the medium located at the rotational symmetry axis is the minimum, and the thickness of the medium is increased along with the distance from the rotational symmetry axis.

2. The lens of claim 1, wherein the receiving cavity is in communication with the light inlet cavity.

3. The euro-compliant LED emergency lighting lens of claim 2 wherein the body further comprises a mounting surface.

4. The European LED emergency lighting lens of claim 3, wherein a ray a of the LED light source enters the medium from the entrance surface and then exits the exit surface as a ray b, the ray b forming an arc θ with the axis of rotational symmetry Z, the ray b being incident on the exit surface, the arc θ being substantially perpendicular to the axis of rotational symmetry Z, the LED emergency lighting lens further comprising a light source disposed between the entrance surface and the exit surface, the LED emergency lighting lens further comprising a light source disposed between the exit surface and the exit surface

The light intensity of the light ray b satisfies the following relationship:

when theta is more than 0 and less than pi/3, I (theta) is I_0*(-16.236*cos⁴θ+51.11*cos³θ-60.41*cos²Theta + 31.336-cos theta-A), A is a constant, and A is more than or equal to 4.70 and less than or equal to 4.80;

when pi/3 < theta < pi/2, I (theta) ═ I₀*(28.558*cos³θ-11.634*cos²Theta + 1.4042-cos theta + B), B is a constant, B is more than or equal to 0.01 and less than or equal to 0.03,

I₀the central light intensity of the LED light source is positioned on the rotational symmetry axis Z after the LED light source is emitted through the medium and the emitting surface; A. the value of B depends onThe characteristics of the LED light source.

Images