KR102222649B1 - Light device - Google Patents

Abstract

An embodiment of the present invention is a printed circuit board; A plurality of light sources disposed on the printed circuit board; An optical member including a protruding optical pattern on the printed circuit board; A resin layer disposed on the printed circuit board and in direct contact with the plurality of light sources and the optical member; And a reflective member disposed between the optical member and the printed circuit board, wherein the plurality of light sources penetrate the optical member and the reflective member.

Description

Light device}

Embodiments of the present invention relate to the technical field of lighting devices, and more specifically, by removing the light guide plate structure, the overall thickness is reduced, light efficiency is secured, and a protruding optical pattern is formed to change the shape and three-dimensional effect of light according to the viewing angle. It relates to a lighting device structure that can implement.

LED (Light Emitted Diode) devices are devices that convert electrical signals into infrared or light using the characteristics of compound semiconductors. Unlike fluorescent lamps, they do not use harmful substances such as mercury, so there are fewer causes of environmental pollution, compared to conventional light sources. It has the advantage of long life. In addition, it consumes low power compared to a conventional light source, has excellent visibility due to a high color temperature, and has an advantage of less glare.

Therefore, the current lighting device is developing from a form using a conventional light source such as a conventional incandescent light bulb or a fluorescent lamp to a form using the above-described LED element as a light source, in particular, as disclosed in Korean Patent Laid-Open No. 10-2012-0009209. By using a lighting device that performs a surface emitting function has been provided.

The light guide plate is basically used as an essential part of the conventional lighting device, but due to the thickness of the light guide plate itself, it is possible to reduce the thickness of the overall product. It has a disadvantage that is difficult to apply, and accordingly, a problem in which product design and design modification is not easy was involved.

The embodiment of the present invention has been proposed to solve the above-described conventional problem, and it is possible to provide a lighting device structure capable of reducing the overall thickness.

In addition, an embodiment of the present invention makes it possible to provide a lighting device structure capable of securing reliability while improving the degree of freedom in product design by allowing the lighting device itself to have flexibility on the upper part of the printed circuit board or under the optical member.

In addition, in the embodiment of the present invention, it is possible to provide a lighting device capable of implementing a geometric light pattern.

A lighting device according to an embodiment for solving the above-described problems includes: a printed circuit board; A plurality of light sources disposed on the printed circuit board; An optical member including a protruding optical pattern on the printed circuit board; A resin layer disposed on the printed circuit board and in direct contact with the plurality of light sources and the optical member; And a reflective member disposed between the optical member and the printed circuit board, wherein the plurality of light sources pass through the optical member and the reflective member.
The resin layer may fill the plurality of light sources and the optical member.
The optical pattern may be provided on a surface opposite to a surface in contact with the resin layer.
The optical member may be any one of a prism sheet having a plurality of unit prism lens patterns, a microlens array sheet, and a lenticular lens sheet, or a combination thereof.
The optical pattern of the optical member may be provided on a surface in contact with the reflective member.
An adhesive pattern may be further included between the optical member and the reflective member.
A gap adjacent to the adhesive pattern may be further included between the optical member and the reflective member.
It may further include a reflective pattern on the reflective member.
A second optical member disposed on the resin layer may be further included, and the second optical member may be disposed to be spaced apart from the resin layer.
Further comprising an optical pattern layer disposed on the upper surface of the resin layer, the optical pattern layer is a first optical sheet disposed on the upper surface of the resin layer, a second optical sheet disposed spaced apart from the first optical sheet, the It may include an optical pattern and an adhesive layer disposed between the first optical sheet and the second optical sheet.
The adhesive layer may be disposed to surround the optical pattern, and may include a space for separating the optical pattern from the adhesive layer.
The optical pattern may be disposed on a lower surface of the second optical sheet in a direction perpendicular to the printed circuit board to correspond to a position overlapping with the light source.
The optical pattern may have a structure in which a diffusion pattern including at least one material selected from _{TiO 2} , CaCO ₃ , BaSO ₄ , and Silicon and a light shielding pattern including _{Al or a mixture of Al and TiO 2 are overlapped.}

According to an embodiment of the present invention, the light guide plate is removed and the resin layer is used to guide light, thereby reducing the number of light emitting units and reducing the overall thickness of the lighting device.

In addition, according to an embodiment of the present invention, flexibility can be secured by forming a lighting device using a flexible printed circuit board and a resin layer, thereby increasing the degree of freedom in product design.

In addition, according to an embodiment of the present invention, by providing an optical member in which a protruding optical pattern is formed between the resin layer and the reflective member, the shape and three-dimensional effect of light are changed according to the viewing angle, and an adhesive pattern is formed between the optical member and the reflective member. It has the advantage of being able to change the shape of the protruding optical pattern, the effect of providing a lighting device with improved aesthetics, and applicable to various types of lighting devices.

In addition, according to an embodiment of the present invention, by providing a reflective member and a reflective pattern, which are structures capable of efficiently reflecting light emitted from the light emitting unit, the effect of maximizing luminance improvement while improving light reflectance and uniform surface There is an effect that can provide a light source.

In addition, according to an embodiment of the present invention, a first optical substrate or a second optical substrate having an optical pattern is formed, and by providing a spacer in which an air layer is formed in the adhesive layer, the hot spots generated in the shading pattern portion and the dark portion are formed. It is possible to eliminate the occurrence of, and at the same time secure reliability between the adhesive layer and the parts to be bonded, there is an effect of implementing a lighting device without significant difference in optical properties, and the effect of enabling precise alignment between parts.

1 shows a main part of a lighting device according to the present invention.
FIG. 2 shows a structure in which a bead and an optical member are added to the lighting device of the embodiment shown in FIG. 1.
3 shows a structure in which an optical member and an optical sheet are added to the lighting device of the embodiment shown in FIG. 1.
4 schematically shows a structure in which the lighting device according to the present invention is applied to a vehicle headlight.
5 shows an image of an actual operating state of the lighting device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in which a person of ordinary skill in the art can easily implement the present invention. However, it should be understood that the embodiments described in the present specification and the configurations shown in the drawings are only preferred embodiments of the present invention, and there may be various equivalents and modified examples that can replace them at the time of the present application. In addition, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention in describing the operating principle of the preferred embodiment of the present invention in detail, the detailed description thereof will be omitted. The terms to be described later are terms defined in consideration of functions in the present invention, and the meaning of each term should be interpreted based on the contents throughout the present specification. The same reference numerals are used for parts that have similar functions and functions throughout the drawings.

The present invention relates to a lighting device using an LED as a light source as a light-emitting unit, wherein the light guide plate is removed and replaced with a resin layer, but by further forming an optical member having a protruding optical pattern between the reflective member and the resin layer, a simple surface The aim is to provide a lighting device structure that can be applied to various applications by implementing a geometric shape rather than light emission.

In addition, the lighting device according to the present invention can be applied to various lamp devices that require lighting, such as vehicle lamps, home lighting devices, and industrial lighting devices. For example, when applied to vehicle lamps, it can also be applied to headlights, interior lighting, door scarves, and rear lights. Additionally, the lighting device of the embodiment can be applied to the field of a backlight unit applied to a liquid crystal display device, and in addition, it will be said that it can be applied to all lighting-related fields that are currently developed and commercialized or that can be implemented according to future technological developments.

3 shows a main part of a lighting device according to an embodiment of the present invention.

Referring to FIG. 3, the lighting device 100a according to the embodiment includes an optical member 210 including an optical pattern and one or more light emitting units 130 inserted into the optical member 210. Can be. That is, the structure penetrating the optical member 210 may form an arrangement structure with the light emitting unit 130. In addition, the optical member 210 and the resin layer 150 formed on the one or more light emitting units 130 may be further included.

Looking at the configuration of the lighting device according to an embodiment of the present invention implemented around such a basic configuration through FIG. 3, in the embodiment of the present invention, a printed circuit board 110 on which the above-described light emitting unit 130 is mounted is provided. It may be formed to further include.

Specifically, the lighting device according to an embodiment of the present invention is formed in a structure in which at least one light emitting unit 130 is formed on the printed circuit board 110 and the light emitting unit 130 is inserted. The optical member 210 provided with the protruding optical pattern is sequentially formed, and may include a resin layer 150 that bury the light emitting unit 130 and guide the emitted light to the front.

Here, a reflective member 120 formed on the printed circuit board 110 may be further included. The optical member 210 includes a means for performing an optical action, and may include, for example, an optical guide, a lens, a waveguide, and the like. In FIG. 1, the optical member 210 according to an embodiment is illustrated as a structure having a stacked structure of two or more layers, but is not particularly limited thereto.

The printed circuit board 110 refers to a board on which a circuit pattern is formed on a board, that is, a PCB, and in particular, in the present invention, it may be formed of a flexible printed circuit board (FPCB) in order to secure a certain degree of flexibility.

The light emitting unit 130 is a part that is arranged in one or more numbers on the flexible printed circuit board 110 to emit light, and the light emitting unit 130 of the embodiment may be formed of a side view type light emitting diode. have. In the case of using a side-type light-emitting diode, compared to the case of using a top-view light-emitting diode, the light transmitted to the top can be transmitted through the resin layer. By adjusting the light intensity, the light-emitting unit 130 ), the thickness of the laminated resin layer can be made thin, and the light uniformity of the light emitting surface of the flat plate structure can be secured through the resin. In other words, when using a top-emitting type light-emitting diode, the direction of light is directed upward. In this case, the range of light spreading around the light-emitting diode (LED) is narrow, and the side-type light-emitting diode spreads light widely to the side, thereby improving light distribution characteristics. It is possible to reduce the number of light sources by improving the light quantity securing characteristics, i.e., a light emitting diode having a structure in which the direction of the emitted light does not go straight upward, but radiates toward the side, is used as the light emitting unit 130 of the embodiment. I can.

In addition, the light emitting unit according to the embodiment of the present invention may be implemented in a structure buried in a resin layer. In addition, when the light emitting unit is formed in a structure buried in a resin layer, the resin layer and the light emitting unit are integrally formed. The structure is simplified. In addition, when a luminous element such as an LED used as a light emitting unit is applied, the refractive index of the phosphor silicon and resin layer disposed in front of the LED optical element is different. The effect of increasing the amount of light emitted from it occurs.

Specifically, considering that the refractive index of the phosphor silicon is usually 1.5 and the refractive index of the resin layer is usually 1.47, the smaller the difference in the refractive index of the medium through which light passes, the larger the critical angle. As a result, the light lost inside the LED is reduced. It decreases, and a large amount of light can be secured.

In addition, when the light emitting unit is formed in a structure in which a resin layer is inserted, the overall lighting device may have a relatively thin thickness compared to a conventional structure in which a light guide plate is disposed on the upper surface, and light directly into the optical member. Since it is formed in an emitting structure, the advantage of increasing light efficiency by reducing the amount of light leakage can be realized.

In addition, in the lighting device 100a according to the embodiment of the present invention, the light emitting unit 130 made of side-type light emitting diodes is arranged in a direct manner, and the upper direction by using a resin layer that implements light diffusion and reflection functions. By diffusing and inducing light, the total number of light emitting units can be reduced, and the total weight and thickness of the lighting device can be innovatively reduced.

The resin layer 150 is formed on the optical member 210 and the light emitting unit 130, and the resin layer 150 diffuses and induces the light emitted from the light emitting unit 130 to the front. That is, the resin layer 150 is formed in a structure to bury the light emitting unit 130, thereby performing a function of dispersing light emitted from the light emitting unit 130 in the lateral direction.

The resin layer 150 of this embodiment may be formed of a resin of a material capable of diffusing light. For example, the resin layer 150 of the embodiment may be made of a self-curing resin containing an oligomer, and more specifically, the resin layer 150 may be formed using a resin containing a urethane acrylate oligomer as a main material. For example, a resin obtained by mixing a synthetic oligomer of urethane acrylate oligomer and a polyacrylic polymer type may be used. Of course, it may further include a monomer in which a low boiling point dilution type reactive monomer such as IBOA (isobornyl acrylate), HPA (Hydroxylpropyl acrylate), 2-HEA (2-hydroxyethyl acrylate), etc. may be further included. 1-hydroxycyclohexyl phenyl-ketone, etc.) or antioxidants can be mixed. However, the above description is only one example, and in addition to that, the resin layer 150 of the embodiment can be formed of a suitable resin capable of performing a light diffusion function, which is currently developed and commercialized or can be implemented according to future technological developments. something to do.

According to an embodiment of the present invention, due to the presence of the resin layer 150, it is possible to innovatively reduce the thickness occupied by the conventional light guide plate, so that the overall product can be made thinner, and has a soft material. It has the advantage of being able to easily apply to the curved surface of the bar, the advantage of improving the degree of freedom of design, and the advantage of being applicable to other flexible displays.

The reflective member 120 is formed on the upper surface of the printed circuit board 110 and has a structure in which the light emitting unit 130 is inserted. The reflective member 120 of this embodiment is formed of a material having high reflection efficiency, and thus serves to reduce light loss by reflecting light emitted from the light emitting unit 130 upward. The reflective member 120 may be formed in the form of a film, and may include a synthetic resin containing a white pigment dispersed in order to implement a reflective property of light and a property of promoting light dispersion. For example, titanium oxide, aluminum oxide, zinc oxide, lead carbonate, barium sulfate, calcium carbonate, etc. can be used as white pigments, and as synthetic resins, polyethylene terephthalate, polyethylene naphthalate, acrylic resin, colicarbonate, polystyrene, polyolefin , Cellulose acetate, weather-resistant vinyl chloride, and the like may be used, but are not limited thereto.

A reflective pattern 121 may be formed on the surface of the reflective member 120, and the reflective pattern 121 serves to uniformly transmit light to the upper portion by scattering and dispersing incident light. The reflection pattern 121 may be formed by printing on the surface of the reflective member 120 using a reflective ink containing any one _{of TiO 2} , CaCo ₃ , BaSo ₄ , Al ₂ O _{3 , Silicon, and PS, but is limited thereto.} It does not become.

In particular, when the reflective pattern 121 is implemented in a printing method using reflective ink, the design of the optical pattern is facilitated in consideration of the portion to be increased and the portion to be lowered according to the arrangement of the light source. It is easy to implement a desired reflective pattern by applying a method such as overlapping printing (2nd and 3rd printing) as well as first-degree printing of the pattern. In addition, when the reflective ink containing the above-described metal material is applied, the reflective characteristic is superior to the reflective pattern of the structural side in which the general protruding structure is implemented.

In addition, the structure of the reflective pattern 121 is composed of a structure having a plurality of protruding patterns, and in order to increase the scattering effect of light, a dot pattern shape, a prism shape, a lenticular shape, a lens shape, or It may be formed in a combination shape, but is not limited thereto. In addition, the cross-sectional shape of the reflective pattern 121 may have a structure having various shapes such as a triangle, a square, a semicircle, and a sine wave.

The optical member 210 may be disposed on an upper surface of the reflective member 120 and has a structure in which an optical pattern is formed on a surface facing the reflective member 120. This is to form a resin layer on the reflective member 120, when the protruding pattern of the optical pattern rises upward, there is a problem that the resin enters between the patterns of the prism pattern and loses the function of the pattern. Can occur.

In addition, when the optical pattern is formed on a surface in contact with the reflective member, light reflected from the reflective member can be directly scattered by the optical pattern, and thus advantageous effects in terms of light use efficiency can be realized.

It is preferable that the optical pattern of the optical member 210 is formed on a surface opposite to the surface in contact with the resin layer 150.

In this case, the optical member 210 may be formed of any one of a prism sheet having a plurality of unit prism lens patterns, a microlens array sheet, and a lenticular lens sheet, or a combination thereof. The difference in the lens pattern of the above-described optical member is significant in that the advantage of being able to variously design the characteristics of forming a light exit path of a three-dimensional structure according to an embodiment of the present invention is implemented.

As can be seen from the drawing, a gap 230 is formed between the optical member 210 and the reflective member 120 by the optical pattern, or an adhesive pattern 220 is formed in a shape corresponding to the optical pattern. The member 210 and the reflective member 120 are adhered. According to an embodiment, the adhesive pattern 220 is formed on the reflective member 120. A gap 230 formed of an air layer is not formed in a portion where the adhesive pattern 220 is formed. In particular, in this case, when the front surface is adhered using a double-sided adhesive without an air layer, the appearance is contaminated, and a three-dimensional effect can be enhanced by the air layer. In addition, in addition to the adhesive effect, the portion where the adhesive pattern is present forms a difference in refractive index compared to the portion in which the air layer is formed in the portion where the adhesive pattern does not exist, so that various design effects can be realized in the formation of three-dimensional light. Advantages can be implemented.

By providing the optical member 210 such as a prism sheet on which an optical pattern is formed instead of a simple surface light emission as described above, a geometric light pattern is formed, so that the shape and a three-dimensional effect of the light can be changed according to the viewing angle.

At this time, when a pattern using reflective ink is formed on the reflective member 120, the intensity of light can be adjusted, and the shape of the protruding optical pattern by using the adhesive pattern 220 between the reflective member 120 and the optical member 210 Can be transformed.

FIG. 2 shows a structure 100b in which a bead and an optical member are added to the lighting device of the embodiment shown in FIG. 1.

1 and 2, the resin layer 150 of the embodiment of the present invention may further include a plurality of light diffusers 151 having hollows (or voids) formed therein in a mixed and diffused form. , The light diffuser 151 serves to improve light reflection and diffusion characteristics. For example, when light emitted from the light emitting unit 130 enters the light diffuser 151 inside the resin layer 150, the light is reflected and transmitted by the hollow of the light diffuser 151 to diffuse and condensate. It is emitted to the top of the resin layer. The light diffuser 151 may be implemented as a bead structure, for example.

The lighting device 100b according to the embodiment of the present invention illustrated in FIG. 2 may further include a second optical member 290 above the resin layer 150.

When the second optical member 290, such as the structure shown in FIG. 2, is provided in the lighting device according to the embodiment of the present invention, the light diffused and condensed in the resin layer is transmitted to the second optical member 290. At this time, the reflectance and diffusivity of light are increased by the light diffuser 151, so that the amount of light and uniformity of the emitted light later supplied to the second optical member 290 are improved, and as a result, the luminance of the lighting device You will be able to reap the effect of improving.

The second optical member 290 includes a means for performing an optical action, and may include, for example, a light guide, a lens, a light diffusion layer, and the like. In FIG. 2, the second optical member 290 according to an exemplary embodiment is illustrated as a light diffusion layer, but is not particularly limited thereto.

In addition, the content of the light diffuser 151 may be appropriately adjusted to obtain a desired light diffusion effect, and more specifically, may be adjusted in the range of 0.01 to 0.3% based on the total weight of the resin layer 150, but is limited thereto. It is not. That is, the light emitted in the lateral direction from the light emitting unit 130 is diffused and reflected through the resin layer 150 and the light diffuser 151 to proceed upward. The light diffuser 151 is one selected from silicon (sillicon), silica, glass bubble, PMMA, urethane, Zn, Zr, Al ₂ O ₃ , and acrylic. It may be configured, and when the light diffuser 151 has a bead structure, the particle diameter of the bead may be formed in a range of 1 μm to 20 μm, but is not limited thereto.

The lighting device 100b according to the embodiment of the present invention may be formed in a structure implemented by further including the second optical member 290, as described above. In this case, the second optical member 290 is formed on the resin layer 150 and serves to condense light emitted through the resin layer 150. The second optical member 290 may be generally formed of an acrylic resin, but is not limited thereto. In addition, acrylic, polycarbonate (PC), polystyrene (PS), polymethyl methacrylate (PMMA), cyclic olefin co. It will be said that it can be made of any material capable of performing a light-condensing function, such as poly (COC), polyethylene terephthalate (PET), and highly permeable plastic such as resin.

Meanwhile, although not shown in the drawing, a reflective pattern may be formed under the second optical member 290. The reflective pattern refers to a structure in which the pattern is uniformly or non-uniformly arranged, and plays a role of reflecting and dispersing incident light so that light emitted to the outside forms a geometric pattern. Such a reflective pattern is made of a structure having a plurality of patterns, and may be made of a prism shape, a lenticular shape, a concave lens shape, a convex lens shape, or a combination thereof, but is limited thereto. It is not. In addition, the cross-sectional shape of the reflective pattern may have a structure having various shapes such as a triangle, a square, a semicircle, and a sine wave. In addition, the size or density of each pattern may be changed according to the distance from the light emitting unit 130.

The reflective pattern of this embodiment may be formed by directly processing the second optical member 290, but there is no limitation, and it is currently developed and commercialized, such as a method of attaching a film having a predetermined pattern to the second optical member 290, or It can be formed in any way that can be implemented according to future technological developments.

A first spacer 280 may be provided between the second optical member 290 and the resin layer 150 to be spaced apart from each other. At this time, due to the presence of the first spacer 280, the uniformity of the light supplied to the second optical member 290 can be increased, and as a result, the uniformity of the light emitted through the second optical member 290 is increased. ), it has the effect of implementing a uniform surface light emission. Meanwhile, in order to minimize the deviation of light transmitted through the resin layer 150, the thickness H1 of the first spacer 280 may be formed in a range of more than 0 and 20 mm. When the thickness of the first spacer is 0, the spacer does not exist, and if it exceeds 20mm, the amount of light decreases, making it difficult to secure reliability as a lighting device.

FIG. 3 shows a structure 100c in which a second optical member and an optical sheet are added to the lighting device of the embodiment shown in FIG. 1.

1 to 3, the lighting device 100c according to the embodiment of the present invention is formed between the resin layer 150 and the second optical member 290, and is formed on the upper surface of the resin layer 150. 1 optical sheet 170, a second optical sheet 190 formed on the first optical sheet 170, and an adhesive layer 180 formed between the first optical sheet 170 and the second optical sheet 190 The adhesive layer 180 may further include a second spacer 181. That is, the adhesive layer 180 forms a space (second separation portion, 181) spaced around the optical pattern 183, and an adhesive material is applied to the other portions to form the first optical sheet 170 and the second optical layer. It may be implemented in a structure in which the sheets 190 are adhered to each other.

In addition, an optical pattern 183 may be further formed on an upper surface of the first optical sheet 170 or a lower surface of the second optical sheet 190, and at least one optical sheet is additionally formed on the second optical sheet 190. It is also possible to do it. A structure including the first optical sheet 170, the second optical sheet 190, the adhesive layer 180, and the optical pattern 183 may be defined as an optical pattern layer (A). When the second optical sheet 190 is provided in a multi-layered structure in relation to the first optical sheet 170, an air layer is formed around the optical pattern, so that the light that has passed through the resin is scattered again by an air layer having a different refractive index. The light diffusion characteristics are improved, and in the case of the adhesive layer, the role of a spacer to form such an air layer is realized, and at the same time, when formed in a structure surrounding the periphery of the optical pattern, the light-shielding effect realized by the optical pattern is realized. At the same time, it is possible to realize the effect of light diffusion in the peripheral part. In addition, if there is no air layer, the light-shielding effect is remarkably deteriorated.

In addition, the optical pattern 183 formed on the upper surface of the first optical sheet 170 or the lower surface of the second optical sheet 190 may be formed of a light-shielding pattern formed to prevent concentration of light emitted from the light emitting unit 130. In order to do this, an alignment is required between the positions of the optical pattern 183 and the light emitting unit 130, and the first optical sheet 170 is formed by using the adhesive layer 180 to secure a fixing force after the alignment. And the second optical sheet 190 is adhered thereto.

The first optical sheet 170 and the second optical sheet 190 may be formed of a material having excellent light transmittance, and PET may be used as an example.

The optical pattern 183 disposed between the first optical sheet 170 and the second optical sheet 190 basically functions to prevent the light emitted from the light emitting unit 130 from being concentrated. The optical pattern 183 may be formed as a shading pattern so that a certain portion of the shading effect may be implemented in order to prevent a phenomenon in which the light intensity is excessive and thus the optical properties are deteriorated or yellowish light is emitted. The pattern may be formed by performing a printing process on the upper surface of the first optical sheet 170 or the lower surface of the second optical sheet 190 using a light-shielding ink.

The optical pattern 183 may be implemented to control the degree of light blocking or diffusivity with one optical pattern so as to perform a function of partially blocking and diffusing light, not a function of completely blocking light. Furthermore, more specifically, the optical pattern 183 according to the present invention may be implemented as an overlapping printing structure of a complex pattern. The structure of superimposed printing refers to a structure in which one pattern is formed and another pattern shape is printed on the top of the pattern.

According to an embodiment of the present invention, in implementing the optical pattern 183, select among _{TiO 2} , CaCO ₃ , BaSO ₄ , Al ₂ O ₃ , and Silicon on the lower surface of the polymer film (for example, the second optical sheet) in the light emission direction. It can be implemented as an overlapping structure of a diffusion pattern formed using a light-shielding ink containing one or more materials and a light-shielding pattern formed using a light-shielding ink containing Al or _{a mixture of Al and TiO 2.} The superimposed printing structure of these optical patterns is to efficiently control the hot spot phenomenon caused by light emitted from a light source such as LED, and it can perform a more stable light-shielding effect compared to the light-shielding pattern formed by one-degree printing. You will be able to. In addition, since there is a limit to the thickness that can be realized by the printing process, different pattern shapes are implemented through a plurality of printing processes, and the shape is adjusted according to the distance away from the LED to form a partial thickness difference of the pattern itself, thereby shading efficiency. You can also increase it.

That is, it is possible to form a diffusion pattern on the surface of the polymer film by white printing, and then to form a light-shielding pattern thereon, or to form a double structure in the reverse order. In the case of a structure in which a diffusion pattern is formed by white printing in such a superimposed printing structure, and then a light-shielding pattern is printed on the upper part or a structure opposite to the structure, the existence of the diffusion pattern does not completely block the transmitted light. , It is possible to increase the light utilization efficiency by allowing the light filtered by the shading pattern to be diffused upward.

Of course, the pattern formation design can be designed in consideration of light efficiency, intensity, and shading rate. Alternatively, it is possible to form a triple structure in which a light-shielding pattern, which is a metal pattern, is formed on the middle layer in the sequential stacked structure, and a diffusion pattern is implemented on the upper and lower portions thereof. In such a triple structure, it is possible to select and implement the above-described materials, and as a preferred example, one of the diffusion patterns is implemented using _{TiO 2 having excellent refractive index, and CaCO 3} having excellent light stability and color is used together with _{TiO 2} Thus, different diffusion patterns are implemented, and light efficiency and uniformity can be secured through a triple structure of a structure that implements a light-shielding pattern using Al, which is excellent in concealment. In particular, CaCO ₃ functions to realize white light through the function of subtracting the exposure of yellow light, so that more stable light can be realized. In addition to _{CaCO 3 , particles such as BaSO 4} , Al ₂ O ₃ , and silicon beads Inorganic materials having a large size and similar structure can also be used. In addition, it is preferable in terms of light efficiency that the optical pattern 183 is formed by adjusting the pattern density so that the further away from the emission direction of the LED light source, the pattern density decreases.

The adhesive layer 180 surrounds the periphery of the optical pattern 183 and forms a second separating portion 181 at a portion other than the structure or a structure in which the second separating portion 181 is formed at the periphery of the optical pattern 183 It can be formed as, and accordingly, it is possible to implement the alignment by bonding the two optical sheets. That is, the bonding structure of the first optical sheet 170 and the second optical sheet 190 can simultaneously implement a function of fixing the printed optical pattern 183.

At this time, the adhesive layer 180 may use a thermosetting PSA, a thermosetting adhesive, or a UV-curing PSA type material, but is not limited thereto.

At this time, the first spacer 280 described above in the description of FIG. 4 may be formed between the second optical sheet 190 and the second optical member 290, and the presence of the first spacer 280 Accordingly, it is possible to increase the uniformity of light supplied to the second optical member 290, and as a result, an effect of improving the uniformity of light emitted through the second optical member 290 can be realized. In this case, in order to minimize the deviation of the light transmitted through the resin layer 150, the thickness H1 of the first spacer 280 may be formed in a range of more than 0 and 20 mm, but is not limited thereto and is appropriately suited as necessary. The design change is possible as described above in the description of FIG. 4. The presence of the first spacer enables the light that has passed through the optical member 150 and the optical pattern layer to pass through the air layer of the spacer once again and transmits through a medium having a different refractive index, thereby implementing a function to increase the diffusion and scattering characteristics of light. Then, by allowing the second optical member to transmit through a medium having a different refractive index again, the uniformity of the diffused and scattered light can be improved.

The second optical member 290 is formed in pieces so as to be disposed only above the LED so that the LED can be covered from the outside, so that the appearance is improved when turned on/not lit, and surface light emission is possible. Furthermore, a surface emitting effect is achieved in areas without LEDs.

In addition, although not shown in the drawings, it is as described above that one or more optical sheets may be additionally formed on the optical pattern layer (A) if necessary.

4 schematically shows a structure in which a lighting device according to an embodiment of the present invention is applied to a vehicle headlight.

Referring to FIG. 4, the lighting device 100a according to the present invention is formed by using a flexible circuit board and a resin layer, and itself has certain flexibility. Therefore, as shown in Fig. 6, it can be easily mounted on a curved vehicle headlight housing (H), and accordingly, even though the design freedom can be improved and the design freedom of the finished product combined with the housing is improved. It is possible to achieve the effect of securing luminance and illuminance. Meanwhile, in FIG. 4, it is shown that the lighting device shown in FIG. 1 is mounted, but this is only an example, and the lighting device shown in FIG. 2 or 3 may be mounted.

5 shows an image of an actual operating state from the front, bottom, and side surfaces of the lighting device according to the present invention. Referring to FIG. 5, it can be seen that the shape of the light changes according to the viewing angle of the light source by implementing the protruding optical pattern.

As described above and shown in connection with a preferred embodiment for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as shown and described as described above, without departing from the scope of the technical idea It will be well understood by those of ordinary skill in the art that a number of suitable modifications and variations are possible for the present invention. Therefore, all such suitable modifications, modifications and equivalents should be considered to be within the scope of the present invention.

110: printed circuit board
120: reflective member
121: reflection pattern
130: light-emitting unit
150: resin layer
151: light diffuser
170: first optical sheet
180: adhesive layer
181: second separation
183: optical pattern
190: second optical sheet
210: optical member
220: adhesion pattern
230: gap
280: first separation unit
290: second optical member
H: housing

Claims (20)

Printed circuit board;
A plurality of light sources disposed on the printed circuit board;
An optical member disposed on the printed circuit board and including an optical pattern;
A resin layer disposed on the printed circuit board and in direct contact with the plurality of light sources and the optical member; And
Including a reflective member disposed between the optical member and the printed circuit board,
The light source penetrates the optical member and the reflective member, and is disposed in the resin layer,
The optical pattern is formed to have an uneven structure on a lower surface of the optical member in contact with the reflective member,
The resin layer is a lighting device in contact with the upper surface of the optical member.
The method according to claim 1,
Light emitted from the light source forms a geometric light pattern by the optical pattern.
The method according to claim 1,
The optical pattern is a lighting device that is continuously arranged in one direction.
The method of claim 3,
The optical member is a prism sheet having a plurality of unit prism lens patterns, a microlens array sheet, a lenticular lens sheet, any one or a combination thereof.
The method of claim 4,
A lighting device in which the pattern of light seen through the upper surface of the resin layer has a three-dimensional shape.
The method according to claim 1,
A lighting device comprising an adhesive pattern disposed between the optical member and the reflective member.
The method of claim 6,
A lighting device comprising a gap adjacent to the adhesive pattern between the optical member and the reflective member.
The method according to claim 1,
A lighting device including a plurality of reflective patterns disposed on the reflective member.
The method according to claim 1,
Further comprising a second optical member disposed on the resin layer,
The second optical member is a lighting device disposed to be spaced apart from the resin layer.
The method of claim 9,
Further comprising an optical pattern layer disposed on the upper surface of the resin layer,
The optical pattern layer includes a first optical sheet disposed on an upper surface of the resin layer, a second optical sheet disposed to be spaced apart from the first optical sheet, and a second disposed between the first optical sheet and the second optical sheet. Lighting device comprising an optical pattern and an adhesive layer.
The method of claim 10,
The adhesive layer is disposed so as to surround the second optical pattern, the lighting device comprising a space for separating the second optical pattern and the adhesive layer.
The method of claim 10,
The second optical pattern is disposed on a lower surface of the second optical sheet in a direction perpendicular to the printed circuit board to correspond to a position overlapping with the light source.
The method of claim 12,
The second optical pattern,
A diffusion pattern including any one or more materials selected from TiO ₂ , CaCO ₃ , BaSO _{4, and Silicon,}
A lighting device in which a light shielding pattern including Al or a mixture of Al and TiO _{2 is superimposed.}
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