KR20200101773A - Lighting equipment to suppress light-pollution - Google Patents

Abstract

The present invention relates to a lighting device for light pollution suppression. The device includes: a light source emitting radiated light in the direction of an optical axis perpendicular to a light surface; a main lens transmitting the radiated light to a lighting region and including a concave first incident surface facing the light surface and a convex first exit surface having a predetermined thickness; and a light control lens protruding at a part of the circumference of the main lens corresponding to a light pollution region such that intrusive light of the radiated light emitted to and incident on the light pollution region exits after deflecting toward the optical axis by total reflection. According to the present invention, the convex main lens transmitting the radiated light from the light source to the lighting region and the light control lens protruding at a part of the circumference of the main lens corresponding to the light pollution region and deflecting the intrusive light toward the optical axis by total reflection are integrated to constitute an optical lens. Accordingly, there is no need to install an additional device such as a block plate and light emission to the light pollution region is suppressed or limited with ease and simplicity. In addition, a neat appearance can be maintained in terms of design, efficient light distribution without optical loss can be performed with respect to the lighting region, and light distribution can be variously changed (customized) in accordance with lighting design intentions by changing the light control lens.

Description

Light pollution suppression type lighting device{LIGHTING EQUIPMENT TO SUPPRESS LIGHT-POLLUTION}

The present invention relates to a light pollution suppression type lighting device, and more particularly, a lighting device equipped with a lens for uniformly distributing light emitted from a light source to an intended lighting area while suppressing light emission to an unnecessary area It is about.

The industry related to lighting devices in recent years is being led by LED light sources developed in response to the demand for light sources with eco-friendly, high efficiency, and long lifespan, and efforts to further improve the efficiency and brightness of these LED light sources. And research and development are still actively carried out by industry.

The LED light source technology, which has been dramatically improved according to such research and development, is indiscriminately diffused due to the advantages of low cost and high efficiency, causing so-called light pollution (intrusion light, upward light, glare) as shown in Fig. 6(a). Was reached.

In order to protect the public's health from the above light pollution, that is, the misuse of artificial lighting, and to prevent adverse effects on the surrounding ecosystem, the'Artificial Lighting' stipulates the light emission allowance standards for infrastructure lighting such as building lighting, billboards, and various streetlights. The'Act on Prevention of Light Pollution by Light Pollution' was enacted and in effect in 2013.

In order to comply with the provisions of laws and regulations that limit light distribution or luminance, which are light distributions of lighting devices, various technical proposals have been made regarding means or measures for light distribution control or light pollution reduction in relation to lighting devices. Is losing.

As an example among them, FIG. 6B discloses a technology related to a blocking plate separately installed in a lighting device to shield the divergence of intruding light.

Such conventional means for reducing intrusion light, as shown in Fig. 6(a), of the radiated light emitted from the artificial light source of the lighting device unnecessarily radiates to an area other than the illumination area (ex: road) by design (after It has the advantage of effectively reducing light pollution such as sleep disturbance by artificially shielding the diffusion of dead light) into residential areas.

However, in this case, optical loss is generated by the blocking plate itself, and the overall light distribution of the lighting device is distorted differently from the lighting design intent, affecting the lighting environment, as well as harming the design aesthetic of the lighting device, causing the surrounding landscape. There is a problem in that it inhibits

Therefore, it is applied to the standardized lighting module level, that is, the light emission stage, rather than a separate device that artificially adjusts the lighting angle or a blocking plate that is additionally installed in addition to the lighting device, so that the incident light does not diffuse into the light pollution area. At the same time, there is a need for improvement or research and development on the optical structure that can uniformly distribute the illumination area.

An object of the present invention is to deflect the incident light in the illumination direction structurally and optically at the stage of a standardized illumination module consisting of a light source and a lens for light distribution rather than suppressing the incident light by being additionally installed in the illumination device. It is to provide a light pollution suppression type lighting device in which light distribution to the light pollution area can be limited while efficient light distribution is achieved for a lossless illumination area.

The object is a light source for emitting radiation in the direction of the optical axis perpendicular to the light surface; A main lens configured to transmit the radiated light to the illumination area, including a first incident surface concavely formed facing the light surface, and a first exit surface convexly formed therefrom with a predetermined thickness therefrom; And a light control lens protruding from a part of the circumference of the main lens corresponding to the light pollution area so that the incident light emitted to the light pollution area among the radiated light is deflected toward the optical axis by total reflection and then emitted. It is achieved by a suppressed lighting device.

The light control lens includes: a second incident surface provided in a region where the emitted incident light is received, forming a concave groove together with the first incident surface, and refracting the received incident light into the interior of the light control lens; A total reflection surface inclined at a first slope so that total reflection of the refracted incident light is achieved; And a second exit surface provided at the protruding end of the light control lens so that the total reflected intrusion light is received and then deflected toward the optical axis.

The first incident surface is formed to be concave in cross section with a gentle slope with respect to the light surface, and the second incident surface is formed to be concave in cross section with a steep slope with respect to the optical surface. 2 The incident surface may form an asymmetrical concave groove with respect to the optical axis.

The second incident surface is formed in an angle range corresponding to 25° to 30° from the light surface through which the optical axis passes, and may receive the emitted incident light.

The total reflection surface is formed inclined at the first slope so that the minimum incident angle of the incident light transmitted through the second incident surface and incident on the total reflection surface is at least greater than a critical angle for each material, the first slope As a reference, it may be larger than the critical angle for each material and smaller than the angle minus the critical angle for each material from 90°.

The second exit surface is inclined with a second slope such that the maximum incident angle of the total reflected incident light is at least less than the critical angle for each material, the second slope is greater than 0° based on a plane parallel to the light surface, and It may be smaller than the star critical angle.

The light source may be an incandescent lamp, a discharge lamp, or at least one or more LED devices capable of emitting radiation toward the first incident surface and the second incident surface.

According to the present invention, a convex main lens that transmits light emitted from a light source to an illumination area and a light control lens that protrudes from a part of the circumference of the main lens corresponding to the light pollution area and deflects the incident light toward the optical axis through total reflection are integrated. As a result of constituting one optical lens, the emission of light to the light pollution area is simply and easily suppressed or limited without the need to additionally install a separate device such as a blocking plate, as well as maintaining a clean design appearance and light loss. Efficient light distribution to the illumination area can be achieved without and there is an effect that the light distribution can be variously changed (customized) according to the lighting design intention through the variable light control lens.

1 is a perspective view of a light pollution suppressing lighting device according to an embodiment of the present invention.
2 is a cut and exploded perspective view of FIG. 1.
FIG. 3 is an operational state diagram illustrating a process in which radiated light emitted from a light source is transmitted through a main lens and a light control lens based on FIG. 2.
4A is a view showing an illumination rate curve based on the optical axis of a street light to which FIG. 1 is applied.
FIG. 4B is a diagram illustrating an illumination rate curve based on an optical axis of a street light excluding a light control lens in FIG. 1.
FIG. 5 is a diagram showing illumination distributions for a vertical plane, which is a rear vertical plane, of the street light shown in FIGS. 4A and 4B.
6 is a diagram showing a blocking plate for shielding the misuse of artificial lighting due to incident light in a house and the emission of conventional incident light as an example of light pollution.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, a description of a function or configuration that is already known will be omitted in order to clarify the gist of the present invention.

1 is a perspective view of a light pollution suppressing lighting device according to an embodiment of the present invention, FIG. 2 is a cut and exploded perspective view of FIG. 1, and FIG. 3 is a main lens and light emitted from a light source based on FIG. It is an operating state diagram for explaining a process transmitted through the control lens, FIG. 4A is a view showing an illumination rate curve based on the optical axis of the street light to which FIG. 1 is applied, and FIG. 4B is a view of the street light excluding the light control lens in FIG. It is a diagram showing an illumination rate curve based on the optical axis, and FIG. 5 is a diagram showing the distribution of illuminance on the vertical plane, which is the rear vertical plane of the streetlight shown in FIGS. 4A and 4B, respectively, and FIG. 6 is an example of light pollution. It is a diagram showing a blocking plate that shields the misuse of artificial lighting by the intrusion light of a house and the emission of conventional intrusion light.

In the description and claims of the invention, the upper (upper), lower (lower), left and right (lateral or lateral), front (front, front), rear (fold, rear), etc., which refer to directions, etc. For convenience of description, it is determined based on the relative position between the drawings and the components, and each direction described below is based on this, except for cases specifically limited differently.

In the light pollution suppressing lighting device 100 according to the present invention, the intrusion light (PL) into the light pollution area (A2 _flat , A2 _direct ) is simply and easily suppressed or limited without the need to install a separate additional device, It is an invention conceived to maintain a neat design appearance, minimize light loss, and allow efficient and uniform light distribution to the lighting area (A1) and various customization of light distribution according to the lighting design freely.

In order to specifically implement the functions or actions of the present invention as described above, the light pollution suppressing lighting device 100 according to an embodiment of the present invention includes, as shown in FIGS. 1 to 3, the light source 110 , The main lens 120 and the light control lens 130 may be included.

Here, the main lens 120 and the light control lens 130 receive the radiated light L radiated from the light source 110 in the lateral and vertical directions and the incident light PL radiated to one side through different incident surfaces. Lenses with a dual optical structure that refract through different emission surfaces to minimize light distribution to the light pollution area (A2 _flat , A2 _straight ), while enhancing the light distribution to a predetermined illumination area (A1) without loss of light. As a combination, it may be integrally formed of a light-transmitting material.

For example, the main lens 120 and the light control lens 130 include at least one of polycarbonate (PC) and polymethyl methacrylate (PMMA) having excellent light transmittance and moldability. The resin may be integrally manufactured through injection molding as a material, and alternatively, it may be integrally manufactured by cutting a light-transmitting amorphous solid glass or the like.

Hereinafter, each of the components mentioned above will be described in detail as follows.

First, the light source 110 is a component that receives electric energy from the outside and radiates the radiated light L to the side and downward based on the direction of the optical axis OA that is perpendicular to the optical surface OS. It may be composed of an incandescent lamp, a discharge lamp, or at least one or more LED devices that can emit light toward the first incident surface 122 and the second incident surface 132 that are disposed adjacent to each other.

However, the light source 110 according to an embodiment of the present invention may be configured by mounting at least one LED device having excellent brightness and energy efficiency on a predetermined substrate.

Here, the substrate is a component that applies power supplied from an external power supply (not shown) at a rating to the mounted LED device, and various circuits for constituting a power supply circuit are printed with metal wiring electrically connected to the LED device. Parts can be mounted.

The LED device is a component consisting of a semiconductor device that emits light when a voltage is applied, and is supplied with power through the above-described substrate, and the specific structure or light emitting source 110 is a known technology. A detailed description of it will be omitted.

The main lens 120 receives the radiation light L emitted from the light source 110 in a hemispherical shape with respect to the optical axis OA, and then appropriately refracts the light to uniformly distribute the set illumination area A1 as a whole. As a transmissive component, it may be configured to include a first incident surface 122 and a first exit surface 124.

Here, the first incident surface 122 is a component that is disposed adjacent to the light surface OS and receives and refracts the radiation light L emitted from the light source 110, and is formed in a concave groove shape facing the light surface OS. Can be.

In addition, the first emission surface 124 is a component that refracts the radiated light L refracted through the first incident surface 122 back to the illumination area A1, and forms a predetermined thickness from the first incident surface 122 It may be formed to be convex in the direction of the optical axis OA.

At this time, the degree of concaveness of the first incident surface 122 (inner curvature), the degree of convexity of the first exit surface 124 (outer curvature), the thickness of the main lens 120 or the material (refractive index) of the main lens 120 The light may be variously changed according to the design range of the illumination area A1 or the intended light distribution.

And the path of the radiation light L refracted and transmitted from the first incident surface 122, which is the boundary of the medium, to the first emission surface 124 is determined according to Snell's Law, the law of refraction of light. Since it is a widely known natural law related to light, a detailed description thereof will be omitted.

The light control lens 130 is a design illumination area (A1) of the radiation light (L) emitted from the light source 110 that is irrelevant to the designed illumination area (A1) or radiates to an area where light pollution is expected. As a component specially provided to deflect as much as possible, it may be formed to protrude from a part of the circumference of the main lens 120 corresponding to the light pollution areas (A2 _flat , A2 _straight ).

That is, the light control lens 130 is not refracted at a small angle inside the structure in which the incident light PL emitted in the opposite direction of the illumination area A1 designed based on the optical axis OA is refracted at a large angle. By being bent and structured to have total reflection TR, the incident light PL is deflected toward the optical axis OA as much as possible (illumination area A1). As a result, light loss can be minimized and light distribution to the illumination area A1 can be enhanced compared to the prior art.

In order to specifically implement the above functions or actions, the light control lens 130 according to an embodiment of the present invention includes a second incident surface 132 and a total reflection surface 133 as shown in FIGS. 1 to 3. And a second exit surface 134 and the like.

The second incident surface 132 is provided along an area where the incident light PL arrives or receives the incident light PL, while receiving the incident light PL, and the incident light incident into the interior of the light control lens 130 and refracted. As a component that directly guides PL) to the total reflection surface 133 to be described later, the second incident surface 132 forms a concave groove together with the first incident surface 122.

At this time, the second incident surface 132 is the optical axis (OA) with light surface light pollution region (OS) is determined in accordance with each lighting design into a predetermined angular range with respect to the vertical plane and the horizontal plane relative to the point at which cross each other (A2 _flat, A2 _straight ) or at least a light pollution area (A2 _flat , A2 _straight ) may be formed in a variety of surface shapes including.

However, the second incident surface 132 according to the embodiment of the present invention is 25 in the direction of the optical axis OA along the vertical surface from the optical surface OS through which the optical axis OA passes, as shown in FIGS. 1 and 2. It can be formed in an angle range corresponding to ° to 30 °, that is, 0 ° to 25 ° to 30 °.

In addition, the second incident surface 132 may be formed in an arc shape in an angular range corresponding to 60° to 180° along a horizontal plane with respect to the optical surface OS through which the optical axis OA passes.

As described above, the angle range of the second incident surface 132 in the vertical and horizontal directions is set or designed in consideration of the purpose or direction of lighting, the height of the lighting device 100, the surrounding environment, etc. It can be changed in various ways according to (A1) and light pollution area (A2 _Pyeong , A2 _directly ).

Meanwhile, as shown in FIG. 3, the cross section of the first incident surface 122 is formed to be concave with a gentle slope with respect to the optical surface OS, and the second incident surface 132 has a cross section of the optical surface OS. The first incident surface 122 and the second incident surface 132 are formed in a concave shape with a steep inclination to each other, so that the first incident surface 122 and the second incident surface 132 form an asymmetric concave groove shape with respect to the optical axis OA.

At this time, the second incident surface 132 is why the formed recessed steep slope with respect to the light surface (OS), the light pollution area is diverging in (A2 _flat, A2 _straight) the second incidence plane a predetermined angle is incident to 132 This is to allow all of the intrusion light PL in the range to be refracted in a direction toward the total reflection surface 133 to be described later and then total reflection TR.

And the reason that the first incident surface 122 is formed to be concave with a gentle slope unlike the second incident surface 132 is that the first incident surface 122 is structurally naturally connected to the second incident surface 132 at a steep slope. It is intended to form an asymmetrical concave groove with respect to the optical axis OA, so that the light distribution of the radiated light L can be concentrated toward the illumination area A1 than in the case of a symmetrical groove.

The total reflection surface 133 has a predetermined thickness with the second incident surface 132 described above, and is inclined at a first slope S1 to achieve total reflection TR for the refracted incident light PL. As an element, if it is inclined to cause total reflection (TR) of the incident light (PL) transmitted or refracted from the second incident surface 132 formed in a predetermined angular range in an angular range greater than the general refraction angle, the flatness or shape of the surface Etc. are not particularly limited.

Here, the total internal reflection (TR) refers to a medium with a large refractive index (main lens 120, light control lens 130) toward a small medium (air) at a specific angle of incidence (an angle to the normal of the interface of the medium). It refers to a phenomenon in which light is refracted into a small medium and is not transmitted but is reflected all inside a large medium.

In this case, the incident angle at which the total reflection TR occurs is referred to as a critical angle, and all light traveling at an incident angle greater than or equal to the critical angle θc is reflected in a symmetrical form with respect to the normal of the interface of the medium.

As above, the critical angle (θc) for total reflection (TR) varies depending on the material forming the lens when the refractive index of air is approximately 1, for example, in the case of PC (refractive index of 1.586), the critical angle (θc) is approximately 39.09°. , The critical angle θc of PMMA (refractive index 1.49) is approximately 42.16°. That is, the lens made of the PC material can be induced to bend the incident light PL toward the main lens 120 by total reflection than the PMMA material.

However, the total reflection surface 133 according to the embodiment of the present invention is the minimum incident angle of the incident light PL transmitted or refracted through the second incident surface 132 when referring to FIG. 3(b). (θmin) may be inclined with a first slope (S1) that makes it larger than the critical angle (θc) for each material, and in a flat or curved shape for consistent total reflection (TR) induction for the incident light (PL). Can be done.

At this time, the first slope (S1) of the total reflection surface 133 to be inclined is greater than the critical angle (θc) for each material based on the light surface (OS), and is smaller than the angle minus the critical angle (θc) for each material from 90°. Limiting it to the range may be desirable for smooth total reflection (TR) induction for the incident light PL and for limiting the size of the light control lens 130. (Critical angle (θc) for each material <S1 <(90°- material) Star critical angle (θc))

Here, when the first slope S1 is greater than the upper limit of 90°- critical angle θc for each material, the incident angle of the incident light PL incident in the vertical light pollution area ( _directly A2) decreases and the total reflection surface 133 ), as the total reflection (TR) of the intrusion light (PL) does not occur smoothly, the intrusion light (PL) cannot be deflected to the illumination area (A1). There is a problem in that light pollution cannot be solved by passing through.

On the other hand, when the first slope (S1) is smaller than the lower limit, the critical angle (θc) for each material (for example, 39.09° for PC, 42.16° for PMMA), the intrusion enters the vertical light pollution area ( _directly from A2). The incident angle of the light PL increases so that the total reflection TR of the incident light PL by the total reflection surface 133 is smoothly performed, but for the total reflection TR corresponding to the incident light PL in the entire range There is a problem in that the slope 133 is excessively long and the size of the light control lens 130 is enlarged.

In addition, there is a problem in that the degree of bending of the incident light PL due to the total reflection TR is small, so that effective deflection of the incident light PL′ directed toward the illumination area A1 cannot be achieved.

The second exit surface 134 is provided at the protruding end of the light control lens 130, which is a region in which the incident light PL having total reflection TR reaches or receives the incident light PL, while receiving the incident light PL. It is a component that refracts the incident light PL` from the inside of the lens 130 to the illumination area A1 that is outside air.

This second emission surface 134 is incident in the vertical light pollution area ( _directly A2) range and is totally reflected from the total reflection surface 133 at various angles (TR) most of the incident light (PL`) is optical axis (OA) As long as it has a structure that can be deflected toward the side, the flatness of the surface and the shape of the surface are not particularly limited.

However, the second exit surface 134 according to the embodiment of the present invention is the maximum incident angle (θ`max) of the incident light PL reflected through the total reflection surface 133 when referring to FIG. 3(c). ) May be inclined with a second slope (S2) to be at least smaller than the critical angle (θc) for each material, and a flat surface or a flat surface to induce a consistently deflected optical axis (OA) refraction with respect to the incident light (PL`) It can be formed in a curved shape.

At this time, the second slope S2 of the second exit surface 134 that is inclined is larger than 0° upward based on the plane OS` parallel to the light surface, and is limited to a range smaller than the critical angle θc for each material. This is to more effectively refract the outgoing incident light (PL`) in the direction of the optical axis (OA). (0° <S2 <critical angle (θc) for each material)

Here, when the second slope S2 becomes larger than the upper limit of the critical angle θc for each material (for example, 39.09° for PC and 42.16° for PMMA), the second exit surface of the incident light PL subjected to total reflection (TR). As the incident angle to 134 increases accordingly, there is a problem that the incident light PL from the second emission surface 134 is again total reflected TR or is excessively refracted and is emitted to the outside. For this reason, uniform light distribution to the illumination area A1, reduction of light pollution, etc. are not performed as intended.

On the other hand, when the second slope S2 is smaller than the lower limit of 0°, that is, when the second slope S2 is formed inclined downward, the incident angle of the reflected incident light PL increases, as well as the light control lens 130 ) Gradually increases, and most of the incident light (PL) incident in the vertical light pollution area ( _directly from A2) is rather deflected in the opposite direction of the optical axis (OA), so that the light distribution to the illumination area (A1) is increased. There is a problem of being distributed rather than being concentrated.

The light pollution suppressing lighting device 100 according to the present invention described above is provided with only the main lens 120 as shown in FIGS. 4A to 5, and excludes the light control lens 130 as a feature of the present invention. The following effects can be clearly seen when compared with the previously used lighting devices.

First, FIG. 4A is an illumination rate curve for a vertical and horizontal plane measured based on the optical axis OA of a street light 10 equipped with the lighting device 100 according to the present invention, and FIG. 4B is a light control lens 130 It is an illumination rate curve for a vertical and horizontal plane measured based on the optical axis OA of the street light 10 on which the excluded lighting device is mounted.

At this time, in the illuminated area (A1) (the road area in one example) the light flux ratio of the light pollution area of the (A2 _flat, A2 _straight) and the light control area (A3) with respect to the entirety of the light beam one trillion people rate curve is, the illumination rate curve is It is shown by dividing the luminous flux ratio based on the optical axis OA, and by this, it is possible to check how much the incident light PL is controlled.

Here, the light control area A3 is deflected by the incident light PL` by the first incident surface 122 and the second incident surface 132 forming an asymmetric concave groove and intrusion by the light control lens 130 It refers to a light distribution area controlled according to the deflection of light (PL`).

According to FIGS. 4A and 4B, the luminous flux ratio for the lighting region A1 (for example, a road region) of FIG. 4A is 72%, and the luminous flux ratio for the lighting region A1 (for example, a road region) according to FIG. 4B. It can be seen that it is an increase of about 8% from 64% of phosphorus.

These results prove that the case of FIG. 4A effectively reduced the incident light PL emitted to the light pollution area (A2 _flat , A2 _straight ) than the case of FIG. 4B by the addition of the light control lens 130. .

In addition, FIG. 5 is a diagram that simulates each of the illuminance distributions on the vertical plane, which is the rear vertical plane of the street light 10 shown in FIGS. 4A and 4B, respectively, and the light pollution area in which the intrusion light PL is emitted The effect of the present invention can be easily confirmed through mutual comparison of the intensity of illumination for (A2 _Pyeong , A2 _Straight ).

That is, the illuminance measured with respect to the virtual rear vertical surface horizontally separated by 2m in the light pollution direction from the lighting device 100 of FIGS. 4A and 4B having the same total luminous flux of 6,500lm is, in the case of FIG. 4B, the maximum vertical surface illuminance is 44.2. Although lx is 13.4 lx in the case of FIG. 4A, it can be easily confirmed from FIG. 5 that the illuminance is reduced by about 70% when compared to FIG. 4B.

In addition, in the case of Fig. 4a, the ratio of the light pollution areas (A2 _flat , A2 _straight ) is reduced by about 8% compared to Fig. 4b, but considering the vertical surface illumination of Fig. 5, that is, the degree of light pollution reduction, the total is 70%. It can be clearly confirmed that the remarkable reduction of light pollution exceeding that of the present invention was achieved through the present invention.

In the above, although specific embodiments of the present invention have been described and illustrated, the present invention is not limited to the described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have. Therefore, such modifications or variations should not be individually understood from the technical spirit or viewpoint of the present invention, and the modified embodiments should be said to belong to the claims of the present invention.

OS,OS`: wide surface, plane parallel to the optical surface OA: optical axis
A1: Illuminated area A2 <sub>flat</sub> , A2 <sub>straight</sub> : Light pollution area (horizontal and vertical)
A3: Light control area L: Radiated light
PL: incident light PL`: deflected incident light
TR: total reflection (light) S1: first slope
S2: second slope θc: critical angle for each material
θmin: minimum incident angle θmax: maximum incident angle
10: street light
100: light pollution suppression lighting device
110: light source 120: main lens
122: first incident surface 124: first exit surface
130: light control lens 132: second incident surface
133: total reflection surface 134: second exit surface

Claims (7)

A light source emitting radiation in the direction of an optical axis perpendicular to the light surface;
A main lens configured to transmit the radiated light to the illumination area, including a first incident surface concavely formed facing the light surface, and a first exit surface convexly formed therefrom with a predetermined thickness therefrom; And
Light pollution suppression including a light control lens protruding from a part of the circumference of the main lens corresponding to the light pollution area so that the incident light emitted to the light pollution area among the radiated light is deflected toward the optical axis by total reflection and then emitted. Type lighting device. The method of claim 2,
The light control lens,
A second incident surface provided in a region in which the emitted incident light is received, forming a concave groove together with the first incident surface, and refracting the received incident light into the interior of the light control lens;
A total reflection surface inclined at a first slope so that total reflection of the refracted incident light is achieved; And
Light pollution suppression type lighting apparatus comprising a second exit surface provided at a protruding end of the light control lens so that the total reflected intrusion light is received and then deflected toward an optical axis. The method of claim 1,
The first incident surface is formed concave in cross section with a gentle slope with respect to the light surface, and the second incidence surface is concave in cross section with a steep slope with respect to the optical surface,
The first incident surface and the second incident surface to form an asymmetrical concave groove with respect to an optical axis. The method of claim 2,
The second incident surface,
Light pollution suppression type lighting device, characterized in that it is formed in an angle range corresponding to 25° to 30° from the light surface through which the optical axis passes to receive the emitted incident light. The method of claim 2,
The total reflection surface,
Inclination formed at the first slope such that a minimum incident angle of the incident light transmitted through the second incident surface and incident on the total reflection surface is at least greater than a critical angle for each material,
The first slope is,
Light pollution suppression type lighting device, characterized in that it is larger than the critical angle for each material based on the light surface and smaller than the angle minus the critical angle for each material from 90°. The method of claim 2,
The second exit surface,
Inclination is formed with a second slope such that the maximum incident angle of the total reflected incident light is at least smaller than the critical angle for each material,
The second slope is,
Light pollution suppression type lighting device characterized in that it is larger than 0° based on a plane parallel to the light surface and smaller than the critical angle for each material. The method of claim 4,
The light source,
An incandescent lamp, a discharge lamp, or at least one LED device capable of emitting radiation toward the first incident surface and the second incident surface.

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