KR20200101774A - Lighting device indirectly illuminated by induction of light - Google Patents

Abstract

An indirect light induction lighting device is disclosed. The indirect light induction lighting device according to the present invention comprises: a base portion in which a plurality of light source elements directed toward a front surface to be illuminated are spaced apart in a ring shape; a ring-shaped light induction lens arranged in a ring shape in front of the light source element emitting radiated light to receive the radiated light, and to guide and reflect the radiated light to a central portion; a central lens provided at the central portion of the light induction lens to receive the guided and reflected radiated light, and emitting the received radiated light to the surface to be illuminated; and a front cover which covers at least the front surface of the light induction lens and is coupled to the base portion. According to the present invention, a front cover for blocking the exposure of the light source element to the outside is provided, and the ring-shaped light induction lens is integrally formed with the central lens in a thin thickness, and the light induction lens with a unique optical structure is provided. The light induction lens with the unique optical structure is structured to guide and reflect the radiated light to the central lens for illumination on the surface to be illuminated after receiving the radiated light emitted from the hidden light source element. Therefore, the light source element is not directly exposed to the outside, so that the conventional hot spot phenomenon can be fundamentally prevented or reduced. In addition, the slim lighting device can be easily implemented, and high-quality indirect lighting can be implemented to minimizes a decrease in light efficiency.

Description

Indirect light induction lighting system{LIGHTING DEVICE INDIRECTLY ILLUMINATED BY INDUCTION OF LIGHT}

The present invention relates to an indirect light-guided lighting device, and more particularly, a light having an optical structure of an indirect lighting method that enables a slim and simple design and improves light quality, and minimizes the occurrence of hot spots or dark areas. It relates to the device.

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.

Contrary to the LED efficiency improved by such research and development, the LED market price has rapidly declined. Recently, the center of research and development related to LED technology is shifting from product efficiency to light quality improvement and slim design issues.

Here, the slimming of LED lighting products is an issue for securing price competitiveness and ease of installation of the product, and can be achieved through improvement of the optical structure.

Light quality can be summarized as about the uniformity of brightness and color temperature on the surface, glare control for eye comfort from lighting products, and improvement of hot spots and dark areas on the light-emitting surface. .

In particular, it is possible to reduce the number of LED elements used due to the slimming along with the improvement of the efficiency of LED lighting products, but accordingly, the wide spacing between the LED elements and the short distance between the LED elements and the diffusion cover causes hot spots and dark areas on the light emitting surface. It was the cause of letting go.

In this case, the hot spot refers to a phenomenon in which relatively bright spots are generated on the diffusion covers respectively corresponding to the optical axis, which is the emission center of the LED device, and dark spots appear in these yarns, as shown in FIG. 5.

This hot spot phenomenon is likely to occur when the distance between the LED elements is greater than the height of the LED element and the diffusion cover. The conventional solution to solve this problem is to simply make the distance between the LED element and the diffusion cover larger than the distance between the LED elements. Was to do.

The above solution is a very easy way to solve the hot spot, but there is a limit to fundamentally reducing the thickness of the LED lighting product, so it cannot be an alternative to secure price competitiveness and ease of installation.

As another alternative, a method of narrowing the gap between LED devices by increasing the number of LED devices may be considered, but this also has a problem in that it cannot solve the problem of price increase due to the increase in LED devices.

On the other hand, the hot spot phenomenon as described above easily occurs when the transmittance of the diffusion cover is high, because the diffusion ratio decreases as the light emitted from the LED device easily passes through the diffusion cover.

In this regard, conventionally, a diffusion cover having a low transmittance was used to prevent a hot spot phenomenon, but lowering the transmittance could not be said to be a preferred solution because it substantially lowers the optical efficiency.

Therefore, as described above, there is an urgent need for research and development on a fundamental method beyond this, rather than a simple fix, such as adjusting the number or spacing of LED devices, and adjusting the transmittance of the diffusion cover.

An object of the present invention is to fundamentally reduce the hot spot phenomenon by applying a new optical structure in which the light emitted while the light source element is arranged so that it is not exposed to the outside through the lens can be distributed to the surface to be created without loss. It is to provide an indirect light induction lighting device that is structurally easy to implement a slim lighting device.

The object is a base portion in which a plurality of light source elements directed toward the front surface to be formed are spaced apart in a ring shape; A ring-shaped light guide lens arranged in a ring shape in front of the light source element emitting radiated light to receive the radiated light and then guide and reflect the radiated light to a center portion; A central lens provided at a central portion of the light guide lens to receive the guided and reflected radiation to be emitted to a surface to be created; And a front cover that covers at least a front surface of the light guide lens and is coupled to the base.

The light induction lens may include: a first incident surface disposed adjacent to an outer part of the light surface of the light source device to receive and refract first radiated light radiating outward based on the optical axis of the light source device; And a total reflection curved surface protruding forward from the first incidence surface, forming a curved surface, and totally reflecting the refracted first radiation and then guiding it to the central lens.

The light induction lens further includes a second incident surface that is recessed to face a part of the light surface of the light source element, receives the second radiation light emitted to the opposite side of the first radiation light, and then refracts it with the central lens. I can.

A reflective sheet may be interposed between the central lens and the inner surface of the base unit so that the radiated light is smoothly emitted toward the surface to be created with minimum loss.

A spaced space may be formed between the total reflection curved surface and the inner surface of the front cover for smooth total reflection of the first radiated light, or a reflective layer for promoting reflection of the first radiated light may be interposed.

The central lens and the light guide lens may be integrated by double injection of different materials having different refractive indices or injection of the same material having the same refractive index.

The light guide lens may include: a locking protrusion protruding outward from the first incident surface and pressed by a locking protrusion inside the front cover; And a support protrusion protruding rearward from the second incident surface and supported by the inner surface of the base part.

A diffusion layer is further provided on the front surface of the central lens to improve light uniformity of radiation emitted toward the surface to be formed, and the diffusion layer may be integrated by being double-injected together with the central lens.

According to the present invention, while a front cover is provided to block external exposure of a light source element, a ring-shaped light guide lens is integrally formed with the central lens to have a thin thickness, and after receiving the radiated light emitted from the hidden light source element, the radiated light is received. As the light guide lens of the unique optical structure structured to guide and reflect the light source element to the center lens for illumination on the surface to be created is provided, the light source element is not exposed to the outside, so that the conventional hot spot phenomenon can be fundamentally prevented or reduced, and a slim lighting device Can be easily implemented, and high-quality indirect lighting that minimizes a decrease in light efficiency can be implemented.

1 is a partial cut-away view showing a perspective view and an internal structure of an indirect light-guided lighting device according to an embodiment of the present invention.
2 is an exploded perspective view of FIG. 1.
FIG. 3 is a diagram schematically illustrating a longitudinal cross-sectional view of FIG. 1 and transmission of radiated light.
4 is an operational state diagram for showing light induction by the light induction lens according to an embodiment of the present invention.
5 is a view showing a hot spot phenomenon occurring in a lighting apparatus of a direct illumination method in which a conventional light source element is exposed through a lens.

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 partial cutaway view showing a perspective view and an internal structure of an indirect light-guided lighting device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a longitudinal sectional view of FIG. 1 and transmission of radiated light Is a schematic diagram, and FIG. 4 is an operating state diagram for showing light induction by a light guide lens according to an embodiment of the present invention, and FIG. 5 is a direct illumination method in which a conventional light source element is exposed through a lens. It is a diagram showing a hot spot phenomenon occurring in a lighting device.

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 explanation, it is determined based on the relative position between the drawings and the configuration, and unless otherwise limited, the front mentioned below is the direction in which the target surface to be illuminated is located, and the opposite direction is the rear. Will be referred to as.

Indirect light induction lighting device 100 according to the present invention, the light emitted from the light source element 112 in a state in which the light source element 112 arranged in a ring shape along the edge is shielded from being directly exposed to the outside. This invention was devised to simultaneously implement a slim lighting device 100 and fundamentally prevent a hot spot phenomenon while distributing light to the surface to be created with high-quality indirect light without this loss.

In order to specifically implement the functions or actions as described above, the indirect light-guided lighting device 100 according to an embodiment of the present invention is, as shown in FIGS. 1 to 3, the base unit 110, the mineral oil The lens 120, the central lens 130, the front cover 140 and the reflective sheet 150 may be included, and may further include a reflective layer 160 and a diffusion layer 170. .

Here, the light induction lens 120 includes a first emission light L1 radiating outward from the optical axis in a cross-section among radiated light L emitted from the light source device 112 and a second emission light L2 radiating vice versa. As a lens with a dual optical structure that minimizes light loss through different incidence surfaces after receiving light through different incident surfaces, and delivers it to the central lens 130 to realize uniform light distribution without hot spots on the surface to be created, the center It is to form a combination with the lens 130.

The light guide lens 120 and the central lens 130 are resins containing at least one of polycarbonate (PC) and polymethyl methacrylate (PMMA) having excellent light transmittance and moldability. The material may be integrally manufactured through injection molding. Alternatively, it may be integrally manufactured by cutting glass or the like, which is a light-transmitting amorphous solid.

Hereinafter, the above-described configurations will be described in detail.

First, the base unit 110 is a constituent element forming the rear housing of the lighting device 100 according to the present invention, consisting of a bowl shape having an opening in front and having an accommodation space therein, As shown in FIG. 3, a plurality of light source elements 112 spaced apart from each other in a ring shape along the inner edge may be accommodated and installed in a state oriented toward the front surface.

At this time, the light source device 112 is a component made of an LED device that emits light in all directions based on a virtual optical axis vertically penetrating the center of the flat light surface, and the ring-shaped substrate 114 on which electrical wiring is printed Alternatively, a light source module may be formed by being electrically mounted on a plurality of divided arc-shaped substrates 114 constituting one ring while being spaced apart from each other.

The radiated light L emitted in all directions from the light source device 112 is divided into a first radiated light L1 and a second radiated light L2 radiated in opposite directions in the present invention, and induces light in different ways (or Light transmission) method, which is divided into two directions and treated differently.

The above-described base unit 110 may be manufactured using a metal material such as aluminum having excellent thermal conductivity for heat dissipation of the light source module, and electrical components such as a converter (not shown) are combined therein and provided to the light source module. You can control the electricity.

The light induction lens 120 is arranged in a ring shape in front of the light source element 112 that emits radiated light L, receives the radiated light L, and the central lens 130 is positioned as described later. It is a light-transmitting component whose shape is specially optically structured to guide and reflect the radiated light (L).

Here, the guided reflection transmits the radiated light (L) radiated in all directions from the light source device 112 using the basic characteristics of light that is refracted or total reflection (TR) while passing through different media and the shape of the optical structure. Say what you can.

As described above, a light guide lens for uniformly irradiating the surface to be formed with high-quality indirect light by guiding the radiated light L emitted from the light source element 112 arranged at the side edge to the center lens 130 at the center without loss. 120, including the first incident surface 122, the total reflection curved surface 124 and the second incident surface 126, as shown in Figure 1 (b) to 4, the radiation (L) Each can be guided by two routes.

The first incident surface 122 is disposed adjacent to an outer part of the light surface of the light source element 112 to receive and refract the first radiation light L1 radiated outward based on the optical axis of the light source element 112 As an optically structured component, as shown in FIG. 4, it may be a flat surface disposed adjacent to and parallel to a portion of the outer light surface.

At this time, the separation distance between the light surface and the first incident surface 122 is sufficient because the first radiated light L1 is emitted into the air and then incident on the light guide lens 120, which is a dense medium, and is refracted toward the optical axis. It can be within mm.

However, in order to receive most of the first radiated light L1 through the first incident surface 122 having a narrower width, and to manufacture the lighting device 100 with a thinner thickness and size, 0.5 mm to 3 mm It is preferable to arrange and form the first incident surface 122 with a spaced distance.

Due to the arrangement of the first incident surface 122, the first radiation light L1 emitted in a direction opposite to the position of the central lens 130, which will be described later, is a light surface as shown in FIG. 4A. After being refracted toward the virtual optical axis penetrating the center of, it is incident on the total reflection curved surface 124 to be described later at an angle greater than the critical angle, and is transmitted to the central lens 130 by total reflection TR.

In addition, the length of the left and right widths of the first incident surface 122 may be formed outwardly in a state coincident with the optical axis or formed shortly outward without including the optical axis. The shape or curvature of the curved surface of the total reflection curved surface 124 to be described later Alternatively, it may be varied according to the material (refractive index) of the light guide lens 120 including the first incident surface 122.

At this time, in order to achieve a more smooth total reflection (TR) on the total reflection curved surface 124 by refracting the first radiation L1 incident on the first incident surface 122 at a large angle (the refractive angle is reduced), the first incident The material (refractive index) of the light guide lens 120 including the surface 122 is made of a material having a refractive index of 1.6 or more, or formed of a multilayer structure whose refractive index gradually increases along the incident direction of the first radiation L1. It can be formed of different materials.

The propagation path of the first radiation light L1 that is refracted and transmitted from the first incident surface 122, which is the boundary of the medium, to the total reflection curve 124 is determined according to Snell's Law, which is the law of refraction of light. Since it is a known natural law related to light, a detailed description thereof will be omitted.

The total reflection curved surface 124 is the first radiation light L1 so that the first radiation light L1 refracted through the first incident surface 122 is guided to the central lens 130 provided at the central portion of the light guide lens 120. As a component for optically total reflection (TR), as shown in FIG. 4, the outer portion of the light guide lens 120 is formed in a structure that protrudes forward from the first incident surface 122 and has a curved surface.

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

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

As above, the critical angle (θc) for total reflection (TR) (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 1.586), the critical angle (θc) is approximately 39.09°, and the critical angle (θc) of PMMA (refractive index 1.49) is approximately 42.16°.

Therefore, the degree of protrusion from the first incident surface 122 forward (that is, the thickness of the light guide lens 120), the material (refractive index) of the light guide lens 120 as described above, and the curvature of the total reflection curved surface 124 The back may be variously changed within a limit capable of causing total reflection TR in a uniform distribution from the edge of the central lens 130 to the center region of most of the first radiation L1 incident on the total reflection curved surface 124. .

For example, when the light guide lens 120 is made of a PC material, the first emitted light L1 is further bent toward the center lens 130 by total reflection TR than the PMMA material of the same shape (the critical angle is small ), the thickness of the light guide lens 120 itself can be formed to be slimmer.

Meanwhile, a separation space 160 may be formed between the total reflection curved surface 124 and the inner surface of the front cover 140 to be described later for smooth total reflection TR of the first radiated light L1.

Here, the separation space 160 is formed in a shape corresponding to the distance from the total reflection curved surface 124 as shown in (a) or (b) of FIG. 4 and is formed in the front cover 140 to be recessed in the medium having a small refractive index. It is a component that accepts.

Due to the separation space 160 forming the difference in refractive index, the first radiation L1 is transmitted according to the total reflection (TR) condition without having to consider the refractive index of the front cover 140 itself, which is adjacent to the total reflection curved surface 124. Total reflection (TR) can be smoothly performed through the oblique surface 124.

A reflective layer 160 other than air having a small refractive index forming a total reflection (TR) condition may be interposed in the spaced space 160 as described above, as well as the total reflection TR for the first radiated light L1 described above, The first radiation light L1 incident on the total reflection curved surface 124 at an incident angle smaller than the critical angle is reflected as it is and transmitted to the central lens 130, thereby minimizing optical loss.

In this case, the interposition or formation of the reflective layer 160 may be performed by depositing or applying a reflective material in the spacing space 160 recessed in the front cover 140 or by depositing or applying the reflective material to the total reflection curved surface 124.

Due to the formation of the total reflection curved surface 124 as described above, the first radiated light L1 is a central lens 130 that is brightly illuminated through diffusion Df on the surface to be created as shown in FIG. 4A. In spite of the divergence in a direction away from and, it is bent at a large angle without loss of light through the total reflection (TR) action and can reach the central lens 130.

The second incident surface 126 is a component provided to receive the second radiated light L2 emitted to the opposite side of the first radiated light L1 and then refracted (Rf) with the central lens 130, as shown in FIG. As illustrated, it may be an inclined surface that faces a portion of the light surface of the light source device 112 and is recessed.

At this time, the inclination and inclination distance for formation of the second incident surface 126 are refraction of most of the second radiation L2 incident on the second incident surface 126 in a uniform distribution ( Rf) can be variously changed in consideration of the thickness of the central lens 130 to be described later and the refractive index of the central lens 130 and the light guide lens 120 integrally formed.

That is, when the light guide lens 120 is manufactured with a PC material, the second radiated light (L2) is more widely dispersed to the center area of the central lens 130 by refraction (Rf) than the PMMA material of the same inclination and inclination distance. As a result, the diffusion Df by the central lens 130 can be uniformly formed as a whole, and the lighting device 100 having a relatively thin and slim thickness can be manufactured.

Due to the arrangement of the second incident surface 126 inclined at a predetermined angle, most of the second radiated light L2 radiated toward the central lens 130 is reduced as shown in FIG. 4B. 2 Each of them is refracted (Rf) at a level proportional to the angle of incidence to the incidence surface 126 (angle with respect to the normal of the interface of the medium), and can be transmitted to the central lens 130.

In order to allow the second radiation L2 of different incident angles incident on the second incident surface 126 to be refracted at a large angle (Rf) (refractive angle is reduced) and reach a wide range to the center area of the central lens 130 , The material (refractive index) of the light guide lens 120 including the second incident surface 126 may be made of a material having a refractive index of 1.6 or more.

Like the first incident surface 122 described above, the path of the second radiation light L2 that is refracted (Rf) by the second incident surface 126 that is the boundary of the medium and reaches the central lens 130 in a dispersed form is , It is determined according to Snell's Law, a law of refraction of light, and since this is a widely known natural law related to light, a detailed description thereof will be omitted.

The light guide lens 120 may further include a locking protrusion 128 and a support protrusion 129 as shown in FIGS. 1 to 4.

At this time, the locking protrusion 128 is a component protruding outward from the first incident surface 122 and pressed by the locking protrusion inside the front cover 140 to be described later, and the support protrusion 129 is a second incident surface It is a component protruding from 126 to the rear and supported by the inner surface of the base portion 110.

Due to the provision of the locking protrusion 128 and the support protrusion 129, the positional relationship of the light guide lens 120 to the light source element 112 can be accurately regulated, and the flow of the light guide lens 120 is prevented. Accordingly, the lighting device 100 according to the present invention can uniformly and stably irradiate the surface to be created even in the event of an external impact.

The central lens 130 is a component provided at the central portion of the ring-shaped light guide lens 120 to receive the guided and reflected radiation L and emit it to the surface to be formed, as shown in FIGS. 1 to 4 As such, it is a plate-shaped light-transmitting component that is combined with the light guide lens 120 described above.

The central lens 130 includes a first radiated light L1 and a second radiated light L1 and second radiated light L1 and refraction Rf (guided reflection) with minimized light loss through the light guide lens 120 formed along the periphery thereof. L2) is delivered.

At this time, the first radiated light L1 and the second radiated light L2 transmitted to the central lens 130 are repeated by the front and rear surfaces inside the central lens 130 as shown in FIGS. 3 and 4. During reflection (only two reflections are shown in the drawing for convenience), some of them are continuously emitted and diffused (Df) through the front surface, thereby uniformly irradiating the surface to be created with high-quality indirect light. That is, as the first radiation light L1 and the second radiation light L2 are continuously reflected from the inside of the central lens 130 until both are emitted and diffused (Df) through the front surface of the central lens 130 The central lens 130 emits light uniformly as a whole.

Between the central lens 130 and the inner surface of the base unit 110, the radiated light L is not absorbed by the base unit 110 in contact with the rear surface of the central lens 130 and is completely reflected, so that the central lens 130 A reflective sheet 150 may be interposed in order to smoothly emit to the surface to be created through the front surface of ).

Accordingly, loss of the radiation light L that is repeatedly reflected inside the central lens 130 may be minimized.

The central lens 130 and the light guide lens 120 as described above may be integrated by being double-injected with different materials having different refractive indices as needed.

This is to improve light quality by uniformly distributing the radiated light (L) throughout the central lens 130, and when the central lens 130 is double-injected with a material larger than the refractive index of the light guide lens 120, the radiated light ( As L) is refracted again in a direction in which the light dispersion degree increases at the boundary between the central lens 130 and the light guide lens 120, it can be uniformly emitted over the entire front surface of the central lens 130.

The double injection of the central lens 130 and the light guide lens 120 is an injection molding method in which two or more different materials are integrated in one mold, and a transparent resin such as PC and PMMA is molded into the cavity of the injection mold. It may consist of a process of first injection, a process of forming a second cavity by moving an injection mold or a core, and a process of injecting a resin having a different refractive index into a second cavity formed by the second movement.

Unlike the above-described double injection, the central lens 130 and the light guide lens 120 may be integrated by being injected with the same material having the same refractive index for convenience in manufacturing and improving productivity.

On the other hand, a diffusion layer 170 may be further provided on the front surface of the central lens 130 for high-quality illumination through improved light uniformity of the radiated light L emitted toward the surface to be created.

The diffusion layer 170 is formed by randomly containing diffusion particles such as polymers in the transparent resin, and to be integrated with the central lens 130 through the double injection method as described above for convenience and productivity improvement. I can.

The front cover 140 is a light-opaque component provided to fundamentally prevent a hot spot phenomenon by blocking direct external exposure of the light source element 112 arranged in a ring shape while implementing indirect lighting, and FIGS. As shown in 4, the shielding plate 142 covering at least the front surface of the light guide lens 120 is formed in a hollow lid shape, and is coupled to the base portion 110.

Unlike the illustration, the front cover 140 is manufactured in a number of different designs, such as a shield plate 142 covering the edge of the central lens 130 as well as the front surface of the light guide lens 120. And can be used selectively as needed.

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.

L: radiated light L1,L2: first radiated light, second radiated light
TR: Total reflection Rf: Refraction
Df: diffuse
100: indirect light induction lighting device
110: base unit 112: light source element
114: substrate
120: light guide lens 122: first incident surface
124: total reflection surface 126: second incident surface
128: stumbling protrusion 129: supporting protrusion
130: center lens
140: front cover 142: shield plate
150: reflective sheet 160: reflective layer (separated space)
170: diffusion layer

Claims (8)

A base portion in which a plurality of light source elements directed to the front surface to be formed are spaced apart in a ring shape;
A ring-shaped light guide lens arranged in a ring shape in front of the light source element emitting radiated light to receive the radiated light and then guide and reflect the radiated light to a center portion;
A central lens provided at a central portion of the light guide lens to receive the guided and reflected radiation to be emitted to a surface to be created; And
And a front cover that covers at least a front surface of the light-guide lens and is coupled to the base. The method of claim 1,
The light guide lens,
A first incident surface disposed adjacent to an outer part of the light surface of the light source element to receive and refract the first radiated light radiated outward based on the optical axis of the light source element; And
And a total reflection curved surface protruding forward from the first incident surface, forming a curved surface and reflecting the refracted first radiation, and then guiding the first radiation to the central lens. The method of claim 2,
The light guide lens,
And a second incident surface that is recessed to face a portion of the light surface of the light source element and is depressed to receive the second radiation light emitted to the opposite side of the first radiation light and then refracts it with the central lens. Light induction lighting device. The method of claim 2,
Between the central lens and the inner surface of the base portion,
Indirect light-guided lighting device, characterized in that a reflective sheet is interposed to allow the radiation light to be smoothly emitted toward the surface to be created with minimal loss. The method of claim 4,
Between the total reflection curved surface and the inner surface of the front cover,
A space is formed for smooth total reflection of the first radiation, or
An indirect light-guided lighting device, characterized in that a reflective layer for promoting reflection of the first radiation is interposed. The method of claim 2,
The central lens and the light guide lens,
Indirect light induction lighting device, characterized in that the double injection with different materials having different refractive indices, or by injection of the same material having the same refractive index and integrated. The method of claim 6,
The light guide lens,
A locking protrusion formed to protrude outward from the first incident surface and pressed by a locking protrusion inside the front cover; And
And a support protrusion formed to protrude rearward from the second incident surface and supported by an inner surface of the base unit. The method of claim 6,
On the front side of the central lens,
A diffusion layer is further provided to improve the light uniformity of the radiated light emitted toward the surface to be created,
The diffusion layer is an indirect light-guided lighting device, characterized in that the double injection and integrated with the central lens.

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