KR102659684B1 - Lighting apparatus - Google Patents

Abstract

A lighting device according to an embodiment includes a reflective member; a fixing member disposed on the reflective member and having at least one hole formed therein; a light emitting member disposed on the reflective member and disposed in the penetrating portion; and a pattern member disposed on the fixing member, wherein the fixing member includes: a first fixing portion disposed on the reflective member; a second fixing part disposed on the first fixing part; and a third fixing part disposed on the second fixing part, wherein the fixing member includes the same material as at least one of the reflective member and the pattern member.

Description

lighting device{LIGHTING APPARATUS}

The embodiment relates to a lighting device.

Lighting devices are devices that can supply light or control the amount of light and are used in various fields. For example, lighting devices can be applied to vehicles, buildings, etc. to illuminate the interior or exterior.

Additionally, the lighting device can be applied to a vehicle to provide information on the instrument panel and whether various devices are operating as initial information.

For example, the lighting device can be applied to various switches and indicators placed inside the vehicle, such as the center fascia area, garnish area, door area, and pillar area of the vehicle, to visually provide information to passengers.

However, a problem has arisen in which the shape of the lighting device is deformed due to changes in internal or external temperature. In detail, the lighting device includes a PCB (Printed Circuit Board) substrate, a reflective film, a fixing member, and a pattern film, and in a high-temperature environment, the shape of the lighting device is deformed due to differences in heat shrinkage between the components. there is. For example, a phenomenon of peeling or bending between the reflective film and the fixing member occurs due to a difference in the heat shrinkage rate between the reflective film and the fixing member, and the difference in heat shrinkage rate between the fixing member and the pattern film causes the fixing member and the pattern film. The phenomenon of separation or bending is occurring.

Additionally, as the number of switches and indicators placed in a vehicle increases, there is a problem of light leakage occurring to adjacent switches and indicators.

Due to the problems described above, there is a problem in that accurate information cannot be provided to passengers.

Therefore, a lighting device with a new structure that can solve the above problems is required.

The embodiment seeks to provide a lighting device that improves appearance by preventing deformation and prevents light leakage.

A lighting device according to an embodiment includes a reflective member; a fixing member disposed on the reflective member and having at least one hole formed therein; a light emitting member disposed on the reflective member and disposed in the penetrating portion; and a pattern member disposed on the fixing member, wherein the fixing member includes: a first fixing portion disposed on the reflective member; a second fixing part disposed on the first fixing part; and a third fixing part disposed on the second fixing part, wherein the fixing member includes the same material as at least one of the reflective member and the pattern member.

A lighting device according to an embodiment may include a fixing member. In detail, the lighting device may include a fixing member including the same material as the reflective member and the pattern member. Accordingly, it is possible to prevent deformation between the reflective member and the fixing member due to a difference in thermal contraction rate in a high temperature environment, and to prevent deformation between the fixing member and the pattern member due to a difference in thermal contraction rate. Accordingly, it is possible to prevent separation between the reflective member and the fixing member and/or between the fixing member and the pattern member.

Additionally, the lighting device according to the embodiment may include a fixing member with low light transmittance. Accordingly, light leakage can be prevented and light emitted from the light emitting member can be emitted only to a desired area.

1 is an exploded perspective view showing a lighting device according to an embodiment.
FIG. 2 is a cross-sectional view taken along line AA' of FIG. 1.
Figure 3 is a plan view of a light guide plate, a light emitting member, and a fixing member according to an embodiment.
4 to 7 are diagrams for explaining an example of how a lighting device according to embodiments is applied to and operates in a vehicle.

In the description of the embodiments, each layer (film), region, pattern or structure is “on” or “under” the substrate, each layer (film), region, pad or pattern. The description of being formed in “includes being formed directly or through another layer.” The standards for top/top or bottom/bottom of each floor are explained based on the drawing.

Additionally, when a part is said to be "connected" to another part, this includes not only cases where it is "directly connected," but also cases where it is "indirectly connected" with another member in between. Additionally, when a part is said to “include” a certain component, this does not mean that other components are excluded, but that other components can be added, unless specifically stated to the contrary.

The thickness or size of each layer (film), region, pattern, or structure in the drawings may be modified for clarity and convenience of explanation, and therefore does not entirely reflect the actual size.

With reference to the drawings below, a lighting device according to an embodiment will be described.

1 to 3, the lighting device 1000 according to the embodiment includes a cover case 100, a light guide plate 200, a light emitting member 300, a reflective member 400, a fixing member 500, and a pattern member. It may include (600).

The cover case 100 may have a shape with an open top. The cover case 100 may accommodate the light guide plate 200, the light emitting member 300, the reflective member 400, the fixing member 500, and the pattern member 600.

The cover case 100 may include a rigid material. For example, the cover case 100 may include metal. Alternatively, the cover case 100 may include a flexible material. For example, the cover case 100 may include plastic.

The light guide plate 200 may be disposed within the cover case 100 . The light guide plate 200 may emit light incident from the light emitting member 300 upward through total reflection, refraction, and scattering.

The light emitting member 300 can generate light. The light emitting member 300 may transmit light in the direction of the light guide plate 200. The light emitting member 300 may be disposed adjacent to the light guide plate 200. For example, the light emitting member 300 may be disposed on one side of the light guide plate 200. The light emitting member 300 may cause light to enter the light guide plate 200 through one side of the light guide plate 200 .

The light emitting member 300 may be any commonly used light emitting member such as an incandescent bulb, LED, lamp, mercury lamp, discharge tube, neon lamp, or light bulb. The light emitting member 300 may be of various colors depending on the user's request, and the color of the light emitted upward from the light guide plate 200 may vary depending on the color of the light emitted from the light emitting member 300. You can.

The light emitting member 300 may be disposed on a printed circuit board 350. The light emitting member 300 may be mounted on the printed circuit board 350. The printed circuit board 350 may be placed on one side of the light guide plate 200. The light emitting member 300 may be driven by a driving signal applied through the printed circuit board 350.

The reflective member 400 may be disposed adjacent to the light guide plate 200. For example, the reflective member 400 may be disposed below the light guide plate 200. The reflective member 400 may be disposed in contact with the light guide plate 200 . In detail, the reflective member 400 may be disposed in direct or indirect contact with the light guide plate 200. Accordingly, light moving from the lower surface of the light guide plate 200 can be reflected toward the top of the light guide plate 200 by the reflective member 400.

The reflective member 400 may include thermoplastic resin. For example, the reflective member 400 is made of polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), polypropylene (PP), and polyimide (PI). ) may include at least one of thermoplastic resins such as ). Among these, polyethylene terephthalate (PET) has superior processability, surface roughness, whiteness, and reflectivity compared to other thermoplastic resins, and can generally satisfy the characteristics required for the above-mentioned reflective member 400. However, the embodiment is not limited to this, and the reflective member 400 may be formed of a material that can satisfy the characteristics required.

Additionally, the thickness of the reflective member 400 may be about 100 μm to about 300 μm. If the thickness of the reflective member 400 is less than about 100㎛, the efficiency of upwardly reflecting light emitted from one surface of the light guide plate 200 may be low. Additionally, if the thickness of the reflective member 400 exceeds about 300㎛, the overall thickness of the lighting device may become thick.

The fixing member 500 may be disposed adjacent to the reflective member 400. For example, the fixing member 500 may be disposed on top of the reflective member 400. The fixing member 500 may be disposed in contact with the reflective member 400. In detail, the fixing member 500 may be disposed in direct or indirect contact with the reflective member 400. For example, the fixing member 500 may be attached to the reflective member 400 using an adhesive material.

At least one penetrating portion 550 may be formed in the fixing member 500. For example, at least one penetrating part 550 penetrating the fixing member 500 may be formed on the upper surface of the fixing member 500 . The penetrating portion 550 may be a hole formed to penetrate from the upper surface of the fixing member 500 to the lower surface of the fixing member 500. That is, a portion of the upper surface of the reflective member 400 may be exposed by the penetrating portion 550.

The light guide plate 200 may be disposed in the penetrating portion 550. For example, the light guide plate 200 may be disposed inside the penetrating portion 550.

Additionally, the light emitting member 300 may be disposed in the penetrating portion 550. For example, the light emitting member 300 may be disposed adjacent to the penetrating portion 550. In detail, the light emitting member 300 may be disposed inside the penetrating portion 550. The light emitting member 300 may be entirely disposed inside the penetrating portion 550. Alternatively, the light emitting member 300 may be partially disposed inside the penetrating portion 550. Accordingly, when the light-emitting member 300 is viewed from the top of the fixing member 500, the light-emitting member 300 may be partially exposed.

That is, the light guide plate 200 and the light emitting member 300 may be disposed in the penetrating portion 550. In detail, the light guide plate 200 and the light emitting member 300 may be disposed inside the penetrating portion 550. For example, the light emitting member 300 may be disposed between the light guide plate 200 and the fixing member 500. In detail, the light emitting member 300 may be disposed on at least one inner surface of the penetrating portion 550.

Additionally, when there are a plurality of penetrating portions 550 formed in the fixing member 500, the light guide plate 200 and the light emitting member 300 may be disposed in each penetrating portion 550. Accordingly, the lighting devices can be driven individually.

The fixing member 500 may include black. For example, the entire area of the fixing member 500 may be black. Additionally, some areas of the fixing member 500 may be black. The partial area is an area where light emitted from the light emitting member 300 is incident. That is, the fixing member 500 may include a black area in which light emitted from the light emitting member 300 is incident. Additionally, the fixing member 500 may have a light transmittance of about 0.01% or less. Accordingly, it is possible to effectively prevent light emitted from the light emitting member 300 disposed inside the penetration part 550 of the fixing member 500 from being emitted to the adjacent penetration part 550.

Although not shown in the drawing, a diffusion member may be disposed on the light guide plate 200. The diffusion member may be a diffusion sheet. The diffusion member can improve the uniformity of light passing by diffusing light emitted toward the top of the light guide plate 200. The diffusion member may further include diffusion beads to improve light diffusion.

The pattern member 600 may be disposed adjacent to the light guide plate 200 and the fixing member 500. For example, the pattern member 600 may be disposed on the light guide plate 200 and the fixing member 500. Additionally, the pattern member 600 may be disposed on the diffusion member. However, the embodiment is not limited to this, and a diffusion function may be provided on the pattern member 600, so that the diffusion member may be omitted. For example, by adding diffusion beads or the like to the pattern member 600, light passing through the pattern member 600 can be diffused.

The pattern member 600 may be a printing sheet. The pattern member 600 may include a pattern layer 620 and a base substrate 610 disposed on the pattern layer 620. That is, the pattern member 600 may include a pattern layer 620 disposed on the light guide plate 200 and the fixing member 500, and a base substrate 610 disposed on the pattern layer 620. there is.

The base substrate 610 is made of heat-resistant materials such as polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), polypropylene (PP), and polyimide (PI). It may contain any one of plastic resins. Among these, polyethylene terephthalate (PET) in particular has superior processability, printability, surface roughness, and whiteness compared to other thermoplastic resins, and can generally satisfy the characteristics required for the base substrate 610. However, the embodiment is not limited to this, and the base substrate 610 may be formed of a material that can satisfy the characteristics required for the base substrate 610.

The thickness of the base substrate 610 may be about 90㎛ to 110㎛. In detail, the thickness of the base substrate 610 may be about 95 μm to about 105 μm. In more detail, the thickness of the base substrate 610 may be about 98 μm to about 102 μm. Additionally, the thickness of the pattern layer 620 may be about 5㎛ to about 20㎛. In detail, the thickness of the pattern layer 620 may be about 8㎛ to 17㎛. In more detail, the thickness of the pattern layer 620 may be about 10㎛ to 15㎛. If the thickness of the pattern layer 620 is less than about 5㎛, the pattern of the pattern layer 620 may not be visible, and if the thickness of the pattern layer 620 exceeds 20㎛, the luminance of the lighting device may decrease. may deteriorate.

The pattern member 600 may include a pattern portion (PA) and a non-pattern portion (NPA). That is, the pattern layer 620 may include the pattern portion (PA) and the non-pattern portion (NPA). The pattern portion (PA) may be formed in the shape of a logo and/or an icon, and the shape of the pattern portion (PA) may be visible from the outside by light emitted from the bottom to the top.

The pattern portion (PA) may transmit light, and the non-pattern portion (NPA) may not transmit light. Additionally, the pattern part (PA) can be implemented using colored ink, and the non-pattern part (NPA) can be implemented using black or white ink that does not transmit light.

The pattern part PA may be disposed on the penetrating part 550. That is, the pattern portion PA may be disposed on the light guide plate 200. The pattern portion PA may be disposed on an area corresponding to the area where the penetrating portion 550 and the light guide plate 200 are disposed. The pattern portion PA may be disposed in an area that overlaps the area where the penetrating portion 550 is disposed. Accordingly, the light emitted from the bottom to the top is not emitted to the non-pattern part (NPA), but is emitted to the pattern part (PA), so that the shape of the pattern part (PA) can be recognized.

The fixing member 500 will be described in more detail with reference to FIG. 2 .

Referring to FIG. 2, the fixing member 500 may include a plurality of layers. That is, the fixing member 500 may have a multi-layer structure including a plurality of layers. For example, the fixing member 500 may include a second fixing part 510, a first fixing part 520, and a third fixing part 530. In detail, the fixing member 500 includes a first fixing part 520 disposed on the reflective member 400, a second fixing part 510 disposed on the first fixing part 520, and the second fixing part 510 disposed on the reflective member 400. It may include a third fixing part 520 disposed on the fixing part 510.

The thickness of the fixing member 500 may be about 650 μm to about 750 μm. In detail, the thickness of the fixing member 500 may be about 675㎛ to about 725㎛. If the thickness of the fixing member 500 is less than about 650㎛, reliability may be reduced and the light guide plate 200 and the light emitting member 300 cannot be effectively supported. Additionally, if the thickness exceeds about 750㎛, the required thickness of the light guide plate 200 may become thicker, and thus the overall thickness of the lighting device may become thicker.

A common material forming the fixing member 500 may be ABS (Acrylonitrile-Butadiene-Styrene) resin. The ABS resin has excellent heat resistance and reliability, but has the problem of bending or peeling from the reflective member 400 and the pattern member 600 due to a difference in heat shrinkage rate between the reflective member 400 and the pattern member 600. It can happen.

In the lighting device according to the embodiment, the fixing member 500 may include a material having a heat shrinkage rate similar to that of at least one of the reflective member 400 and the pattern member 600. For example, the first fixing part 520 and the third fixing part 530 may include the same material as the reflective member 400 and the pattern member 600.

The second fixing part 510 is made of polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), polypropylene (PP), polyimide (PI), etc. It may contain any one of the same thermoplastic resin. Among these, the pencil hardness of polyethylene terephthalate (PET) is about 2H to about 3H, and the pencil hardness of polycarbonate (PC) is about 1H. In particular, the polycarbonate (PC) has a low pencil hardness of about 1H and thus has excellent processability. In detail, polycarbonate (PC) has lower hardness than polyethylene terephthalate (PET), so it has excellent hole forming properties and can meet the characteristics required for the second fixing part 510 described above.

The second fixing part 510 may include black. For example, the entire area of the second fixing part 510 may be black. Additionally, only some areas of the second fixing part 510 may be black. Accordingly, the second fixing part 510 can absorb light emitted from the light emitting member 300.

Additionally, the thickness of the second fixing part 510 may be about 450 μm to about 550 μm. In detail, the thickness of the second fixing part 510 may be about 475㎛ to about 525㎛. If the thickness of the second fixing part 510 is less than about 450㎛, it is not easy to form the penetrating part 550 in the second fixing part 510 and reliability may be reduced. In addition, when the thickness of the second fixing part 510 exceeds about 550㎛, there is a problem that the thickness of the light guide plate 200 increases and thus the overall thickness of the lighting device increases.

The first fixing part 520 and the third fixing part 530 may be disposed below and above the second fixing part 510, respectively. In detail, the first fixing part 520 may be placed below the second fixing part 510, and the third fixing part 530 may be placed above the second fixing part 510. At this time, the first fixing part 520 and the third fixing part 530 may be placed in direct contact with the second fixing part 510. Additionally, the sizes of the first fixing part 520 and the third fixing part 530 may correspond to those of the second fixing part 510.

The first fixing part 520 may be disposed on the reflective member 400. For example, the first fixing part 520 may be disposed between the reflective member 400 and the second fixing part 510. In detail, the first fixing part 520 may be disposed in direct contact with the reflective member 400.

The thickness of each of the first fixing part 520 and the third fixing part 530 may be about 70 μm to about 110 μm. In detail, the thickness of each of the first fixing part 520 and the third fixing part 530 may be about 80㎛ to 100㎛. When the thickness of each of the first fixing part 520 and the third fixing part 530 is less than about 70㎛, between the second fixing part 510 and the reflective member 400, and/or the second fixing part A phenomenon of bending or peeling may occur between the top 510 and the pattern member 600, and the thickness of each of the first fixing part 520 and the third fixing part 530 exceeds about 110㎛. In this case, the thickness of the light guide plate 200 may become thick, and thus the overall thickness of the lighting device may become thick.

The first fixing part 520 may be formed in a multi-layer structure. For example, the first fixing part 520 may include a first base layer 521, a first adhesive layer 522, and a second adhesive layer 523.

The first adhesive layer 522 may be disposed on the reflective member 400. The first adhesive layer 522 may be disposed in direct contact with the reflective member 400.

The first adhesive layer 522 is a layer containing an adhesive material, and the adhesive force of the first adhesive layer 522 may be about 1,400 g/inch or more. Additionally, the first adhesive layer 522 may include black pigment. Accordingly, the first adhesive layer 522 may be formed in black.

The first base layer 521 may be disposed on the first adhesive layer 522. In detail, the first base layer 521 may be disposed between the first adhesive layer 522 and the second adhesive layer 523. That is, the first base layer 521 may be adhered to the reflective member 400 by the first adhesive layer 522.

The first base layer 521 is made of polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), polypropylene (PP), polyimide (PI), etc. It may contain any one of the same thermoplastic resin. Among these, polyethylene terephthalate (PET) has a small difference in heat shrinkage rate from the reflective member 400, so it can prevent peeling in a high temperature environment and overall meets the characteristics required for the first base layer 521. You can do it.

The second adhesive layer 523 may be disposed on the first base layer 521. The second adhesive layer 523 may be disposed between the first base layer 521 and the second fixing part 510. The second adhesive layer 523 may be disposed in direct contact with the first base layer 521 and the second fixing part 510.

The second adhesive layer 523 is a layer containing an adhesive material, and the adhesive force of the second adhesive layer 523 may be about 1,400 g/inch or more. Additionally, the second adhesive layer 523 may include black pigment. Accordingly, the second adhesive layer 523 may be formed in black.

Additionally, the third fixing part 530 may be disposed on the second fixing part 510. For example, the third fixing part 530 may be disposed between the second fixing part 510 and the pattern member 600. In detail, the third fixing part 530 may be disposed in direct contact with the pattern member 600.

Additionally, the third fixing part 530 may be formed in a multi-layer structure. For example, the third fixing part 530 may include a second base layer 531, a third adhesive layer 532, and a fourth adhesive layer 533.

The third adhesive layer 532 may be disposed on the second fixing part 510. The third adhesive layer 532 may be disposed in direct contact with the second fixing part 510.

The third adhesive layer 532 is a layer containing an adhesive material, and the adhesive force of the third adhesive layer 532 may be about 1,400 g/inch or more. Additionally, the third adhesive layer 532 may include black pigment. Accordingly, the third adhesive layer 532 may be formed in black.

The second base layer 531 may be disposed on the third adhesive layer 532. In detail, the second base layer 531 may be disposed between the third adhesive layer 532 and the fourth adhesive layer 533. That is, the second base layer 531 may be adhered to the pattern member 600 by the fourth adhesive layer 533.

The second base layer 531 is made of polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), polypropylene (PP), polyimide (PI), etc. It may contain any one of the same thermoplastic resin. Among these, polyethylene terephthalate (PET) has a small difference in heat shrinkage rate from the pattern member 600, so it can prevent peeling in a high temperature environment, and overall meets the characteristics required for the second base layer 531. You can do it.

The fourth adhesive layer 533 may be disposed on the second base layer 531. That is, the fourth adhesive layer 533 may be disposed between the second base layer 531 and the pattern member 600. The fourth adhesive layer 533 may be disposed in direct contact with the second base layer 531 and the pattern member 600.

The fourth adhesive layer 533 is a layer containing an adhesive material, and the adhesive force of the fourth adhesive layer 533 may be about 1,400 g/inch or more. Additionally, the fourth adhesive layer 533 may include black pigment. Accordingly, the fourth adhesive layer 533 may be formed in black.

That is, the first fixing part 520 may include the same material as the reflective member 400, and the third fixing part 530 may include the same material as the pattern member 600. Accordingly, it is possible to prevent the reflective member 400, the fixing member 500, and the pattern member 600 from being bent or separated from each other due to a difference in thermal contraction rate in a high temperature environment.

In addition, since the second fixing part 510, the first fixing part 520, and the third fixing part 530 include black, the light emitted from the light emitting member 300 passes through the adjacent penetrating part ( 550) can be effectively prevented from being emitted.

Additionally, in the lighting device according to the embodiment, the upper and lower surfaces of the fixing member 500 may include an adhesive material. That is, the fixing member 500 can be adhered to the reflective member 400 and the pattern member 600 can be adhered to the fixing member 500 by the adhesive material. Accordingly, a separate adhesive member disposed between the reflective member 400 and the fixing member 500 and/or between the fixing member 500 and the pattern member 600 can be omitted, thereby reducing the overall thickness. It can have an effect.

1 to 3, the fixing member 500 includes the second fixing part 510, the first fixing part 520, and the third fixing part 530, and the fixing member ( The penetrating part 550 penetrating the second fixing part 510, the first fixing part 520, and the third fixing part 530 may be formed in 500. The light guide plate 200 may be disposed inside the penetrating portion 550. The light guide plate 200 may directly or indirectly contact the upper surface of the reflective member 400 exposed by the penetrating portion 550. In detail, the light guide plate 200 may be attached to the reflective member 400 using an adhesive material.

The pattern member 600 may be disposed on the light guide plate 200 and the fixing member 500. At this time, some areas of the pattern member 600 may be arranged to be curved by the penetrating portion 550 formed in the fixing member 500. In detail, the pattern member 600 must be arranged in parallel with the light guide plate 200 and the fixing member 500, but some areas may be arranged to be curved due to the penetrating portion 550. This may reduce the overall luminance of the lighting device and cause light leakage, and the shape of the pattern portion (PA) of the pattern member 600 may be viewed as distorted. Accordingly, the thickness of the light guide plate 200 of the lighting device according to the embodiment may correspond to the height of the penetration portion 550. That is, the light guide plate 200 may correspond to the thickness of the fixing member 500. Accordingly, the pattern member 600 may be arranged parallel to the light guide plate 200, the reflective member 300, and the fixing member 500. In comparing the thicknesses of the light guide plate 200 and the fixing member 500, correspondence not only means that they are the same, but also includes all slight errors or tolerances that can be generally considered in the industry.

Additionally, the light guide plate 200 may have a shape corresponding to the penetrating portion 550. Accordingly, the light guide plate 200 may be fixedly disposed inside the penetrating portion 550, and may emit light emitted from the light emitting member 300 disposed on one side of the light guide plate 200 upward. there is.

Hereinafter, the present invention will be described in more detail through examples and comparative examples. These embodiments are merely presented as examples to explain the present invention in more detail. Accordingly, the present invention is not limited to these examples.

Example

A fixing member with at least one hole formed was placed on the reflective member, and a light guide plate and a light emitting member were placed inside the hole. Additionally, a pattern member having a pattern portion formed thereon was disposed on the light guide plate and the fixing member.

The fixing member includes a first fixing part made of polyethylene terephthalate (PET), a second fixing part made of polycarbonate (PC), and a third fixing part made of polyethylene terephthalate (PET) sequentially disposed on the reflective member. It was formed.

At this time, the first fixing part had a thickness of about 100㎛, the second fixing part had a thickness of about 500㎛, and the third fixing part had a thickness of about 100㎛. That is, the thickness of the fixing member was formed to be about 700㎛.

Subsequently, after heat treatment in an environment of 135°C for 30 minutes, the shrinkage rate (%) in the MD (Machine Direction) direction and the shrinkage rate (%) in the TD (Transverse Direction) direction of the pattern member and the fixing member were measured and the change in appearance was measured. observed.

The MD (Machine Direction) direction refers to the direction corresponding to the progress direction of the process when a continuous process is performed, and the TD (Transverse Direction) direction refers to a direction perpendicular to the MD direction.

Comparative example

The fixing member has the same structure as the embodiment except that it is formed of ABS resin with a thickness of about 700㎛, and after heat treatment in an environment of 135°C for 30 minutes, the MD (MD) of the pattern member and the fixing member Machine direction (%) and TD (transverse direction) direction shrinkage (%) were measured and changes in appearance were observed.

Example Comparative example pattern absence PET/PC/PET
fixed member pattern absence ABS fixing member MD direction shrinkage rate -0.610% +0.260% -0.610% Curved from both ends toward the center TD direction shrinkage rate -0.190% -0.090% -0.190% Curved from both ends toward the center Appearance change doesn't exist doesn't exist doesn't exist Peeling off both ends

In the shrinkage ratio (%) in the MD direction and the TD direction, a positive (+) value means relaxation, and a negative (-) value means contraction.

Referring to Table 1, it can be seen that in the lighting device according to the comparative example, both ends of the fixing member peeled off after heat treatment at 135° C. for 30 minutes. In detail, it can be seen that the fixing member of the lighting device according to the comparative example is bent at both ends in the MD and TD directions. That is, in the lighting device according to the comparative example, it can be seen that both ends of the fixing member are separated from the reflective member disposed below the fixing member.

However, it can be seen that the lighting device according to the example shows no change in appearance even after heat treatment for 30 minutes in an environment of 135°C. In detail, it can be seen that in the lighting device according to the embodiment, there is a change in shrinkage rate of the fixing member and the pattern member in the MD and TD directions, but no bending or peeling occurs.

That is, the first and third fixing parts respectively disposed above and below the second fixing part made of polycarbonate (PC) are made of polyethylene terephthalate (PET), and the pattern member is made of polyethylene terephthalate (PET). Since is formed, it can be seen that the shrinkage rate of the fixing member has a similar value to that of the pattern member. Accordingly, it can be seen that the pattern member is not peeled off from the fixing member.

Additionally, although not disclosed in Table 1, since the reflective member is also made of polyethylene terephthalate (PET), it may have a shrinkage rate similar to that of the fixing member. Accordingly, it can be seen that the fixing member is not separated from the reflective member.

That is, since the fixing member and the pattern member include the same material, it can be seen that no change in appearance occurs in a high temperature environment and no light leakage phenomenon occurs. Therefore, it can be seen that the lighting device according to the embodiment can implement uniform luminance in a high temperature environment.

In addition, although not shown in the drawing, an additional substrate may be disposed below the reflective member 400. For example, a lighting device according to an embodiment may be driven by a signal applied through the substrate.

An adhesive member may be disposed between the substrate and the reflective member 400. That is, the substrate and the reflective member 400 can be adhered by the adhesive member.

Conventionally, an optical adhesive film (OCA) was used as the adhesive member. The optical adhesive film (OCA) has excellent transmittance and adhesion, but cannot maintain adhesion in a high temperature environment. Accordingly, a problem may occur in which the reflective member 400 is peeled off from the substrate in a high temperature environment.

Accordingly, in the lighting device according to the embodiment, the adhesive member may include pressure sensitive adhesive (PSA). The pressure-sensitive adhesive (PSA) is an adhesive that responds to pressure. In detail, the pressure-sensitive adhesive (PSA) is an adhesive whose adhesive material acts when pressure is applied. For example, the adhesive strength of the pressure-sensitive adhesive (PSA) may vary depending on the pressure applied to the surface. That is, when the pressure applied to the surface of the pressure-sensitive adhesive (PSA) is high, the adhesive strength can be high.

The adhesive member may be applied in a fluid form between the substrate and the reflective member 400 and then changed into a solid under a certain pressure. Accordingly, the reflective member 400 can be adhered to the substrate.

The thickness of the adhesive member may be about 45㎛ to 55㎛. If the thickness of the adhesive member is less than about 45㎛, peeling due to insufficient adhesion may occur between the substrate and the reflective member 400, and if the thickness of the adhesive member exceeds about 55㎛, the lighting device The overall thickness may be increased.

Additionally, the adhesive force of the adhesive member may be about 1,600 g/inch or more. Additionally, the adhesive member may have an adhesive strength that supports several kg of weight per 1 cm ² of contact area in a high temperature environment.

Accordingly, the lighting device according to the embodiment can prevent the reflective member 400 from peeling and separating from the substrate even when exposed to a high temperature environment.

The lighting device according to the embodiment may be applied to a vehicle by arranging a cover member, etc.

4 to 7 are diagrams showing an example of a lighting device according to an embodiment being applied to a vehicle.

Referring to FIGS. 4 to 7 , lighting devices according to embodiments may be applied to vehicles.

For example, lighting devices according to embodiments may be located inside a car, as shown in FIG. 4, or anywhere inside or outside the car where a lighting device can be applied.

In detail, as the cover member is disposed on the lighting device according to embodiments, when the lighting device is in an off state, the pattern of the lighting device may not be visible from the outside.

The cover member may be a light-transmitting fabric. For example, the cover member may transmit or semi-transmit light.

The transmittance of the cover member may be about 3% to 30%. If the transmittance of the cover member is less than 3%, the brightness of the light emitting member 300 must be increased, so reliability may be reduced due to heat generation, and if the transmittance is more than 30%, the rear part of the fabric is visible. In detail, the transmittance of the cover member may be about 5% to 15%. This is because when the transmittance is less than 5%, visibility is reduced, and when the transmittance is more than 20%, it is difficult to control the brightness of the lighting device.

Additionally, the lighting device according to the embodiment may have a luminance of 200 to 600 nits when the cover member is disposed. Brightness refers to the brightness of the lighting device, and the higher the luminance, the brighter the screen. At this time, if the weather is cloudy, daytime visibility must be at least 200 nits, and if the weather is clear, daytime visibility must be at least 300 nits. Additionally, if the light emitting unit has a luminance exceeding 600 nits, it may obstruct the driver's field of vision, and the heat generation of the light emitting member 300 may become excessively high. thus,

In addition, the cover member may include natural fibers such as cotton, hemp, wool, silk, and asbestos, polyvinyl chloride, polyvinyl alcohol fiber, polyamide fiber, polyester fiber, acrylic fiber, nylon, polyethylene terephthalite, It may include all commonly used synthetic fibers such as polyacrylonicryl, polypropylene, polyurethane, polyalkylparaoxybenzoate, and polytetrafluoroethylene.

The lighting device according to embodiments may determine whether to turn on or off depending on whether the device provided in the vehicle is used. For example, the light emitting member 300 may be turned on or off depending on whether a car door is opened or closed, and may be turned on or off depending on whether the car's seat belt is worn.

Referring to FIG. 5, when the car door 271 of the car 270 is opened, the lighting device 1000 may remain on, flash periodically, or turn on from the off state. on) state, and the lighting device may emit light according to an operation preset by the user.

Also, referring to FIG. 6, when the seat belt 272 of the car 270 is worn, the lighting device 1000 can remain in an off state, and when the seat belt 272 is not worn, the lighting device 1000 can remain in the off state. The light may change to an on state, or the lighting device may emit light according to an operation preset by the user. Therefore, the user can immediately notice when a car door is opened or the car's seat belt is not worn while driving, and quickly take countermeasures, which can be of great help in driving the car safely. A typical dashboard has a small size of about a few centimeters, so the driver or co-driver cannot easily notice it, but the lighting device according to the embodiment can be implemented regardless of size, so it has the advantage of being easily recognizable by the user.

Additionally, the lighting device according to the embodiment may be placed above or below the garnish. The garnish may be a member arranged so that the interior and exterior of the vehicle have a sense of unity with the vehicle body.

Referring to FIG. 7 , the lighting device 1000 according to the embodiment may be disposed between the lower garnish 2100 and the upper garnish 2200.

The lower garnish 2100 and the upper garnish 2200 may include plastic. The lower garnish 2100 and the upper garnish 2200 may be flexible. The lower garnish 2100 and the upper garnish 2200 may include a curved surface.

Additionally, the lighting device according to the embodiment may be placed below the upper garnish without a separate lower garnish.

The upper garnish may be translucent or transparent. When the upper garnish is transparent, the fabric member of the embodiment may be disposed on the upper garnish. When the upper garnish is translucent, the fabric member may be omitted and the light transmittance of the upper garnish may be 3% to 30%.

Additionally, a touch panel 3000 including touch electrodes that perform a touch function may be disposed on the top or bottom of the lighting device. The touch panel 3000 may be placed in a position corresponding to the lighting device 1000.

For example, the touch panel may be placed directly on top or below the lighting device, or may be placed below the upper garnish 2200.

Accordingly, various operations, such as the on/off function of the lighting device, can be performed depending on the touch operation inside the vehicle.

The features, structures, effects, etc. described in the above-described embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the description has been made focusing on the embodiments above, this is only an example and does not limit the present invention, and those skilled in the art will understand the above examples without departing from the essential characteristics of the present embodiments. You will be able to see that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the attached claims.

Claims (13)

absence of reflection;
a fixing member disposed on the reflective member and including at least one penetrating portion;
a light-emitting member disposed on the reflective member and in the penetrating portion; and
It includes a pattern member disposed on the fixing member,
The fixing member is,
a first fixing part disposed on the reflective member;
a second fixing part disposed on the first fixing part; and
It includes a third fixing part disposed on the second fixing part,
A lighting device wherein the fixing member includes the same material as at least one of the reflective member and the pattern member. According to claim 1,
A lighting device wherein the light transmittance of the fixing member is 0.01% or less. According to claim 1,
The first fixing part and the third fixing part include the same material,
A lighting device wherein the third fixing part includes the same material as the pattern member. According to claim 1,
A lighting device wherein the first fixing part includes the same material as the reflective member. According to claim 1,
The first fixing part and the third fixing part include PET (Polyethylene phthalate),
A lighting device in which the second fixing part includes polycarbonate (PC). The lighting device of any one of claims 1 to 5; and
Includes a cover member disposed on the lighting device,
A lighting device for a vehicle wherein the light transmittance of the cover member is 3% to 30%. delete delete delete delete delete delete delete

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