Light guide plate integrated trim panel for vehicle and method of manufacturing the same

Abstract

A light guide plate integrated trim panel for a vehicle is provided and includes, in the trim panel for the vehicle mounted to an interior trim of the vehicle, a light guide plate configured to diffuse light emitted from a light source; and a base formed to surround the circumference and the bottom surface of the light guide plate, wherein the side surface of the light guide plate is formed to be stepped to be fixed by the base holding the circumference of the light guide plate.

Claims

1. A method of manufacturing a trim panel for a vehicle which manufactures the trim panel comprising a light guide plate configured to evenly diffuse light emitted from a light source and a base attached to one side surface of the light guide plate, and mounted to a vehicle interior, the method of manufacturing the light guide plate integrated trim panel for the vehicle comprising: seating the light guide plate on the bottom surface of an upper mold; closing a lower mold which ascends a first lower mold and a second lower mold installed to be movable upward and downward below the upper mold; first injecting which forms a part of the base on the circumference of the light guide plate by injecting molten resin between the upper mold and the first lower mold; opening the second lower mold which descends the second lower mold so that the second lower mold contacting the bottom surface of the light guide plate is spaced apart from the bottom surface of the light guide plate; and second injecting which injects the molten resin between the light guide plate and the second lower mold.

2. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 1, wherein the seating of the light guide plate allows the interior of an air hole formed to penetrate the upper mold to become a negative pressure, and locates the light guide plate on the bottom surface of the upper mold so that the light guide plate is seated on the bottom surface of the upper mold.

3. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 1, wherein in the closing of the lower mold, the first lower mold moves to be spaced apart from the upper mold at an interval corresponding to the thickness of the base, and the second lower mold moves to contact the bottom surface of the light guide plate.

4. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 1, wherein the area of the upper surface of the second lower mold is formed larger than the area of the light guide plate.

5. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 4, wherein the circumference of the upper surface of the second lower mold is located further outside than the circumference of the light guide plate.

6. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 1, wherein the first lower mold and the second lower mold are installed to be movable upward and downward independently from each other.

7. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 6, wherein the side surfaces of the first lower mold and the second lower mold are installed to be in close contact with each other.

8. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 1, wherein in the first injecting, the circumference of the light guide plate is injected by injecting the molten resin into a space formed by the upper mold, the first lower mold, and the second lower mold.

9. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 1, wherein the second injecting injects resin to the bottom surface of the light guide plate to form the base together with the resin injected in the first injecting.

10. The method of manufacturing the light guide plate integrated trim panel for the vehicle of claim 1, further comprising: taking out the panel by opening the first lower mold and the second lower mold from the upper mold, after the second injecting is performed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a cross-sectional diagram showing a state where a surface light emission panel according to the related art has been mounted.

(2) FIG. 2 is a cross-sectional diagram showing a process of bonding the surface light emission panel according to the related art.

(3) FIG. 3 is a front diagram showing a state where a trim panel for a vehicle manufactured according to a method of manufacturing a light guide plate integrated trim panel for a vehicle according to the present disclosure has been installed to a door trim.

(4) FIG. 4 is a cross-sectional diagram taken along line A-A of FIG. 3.

(5) FIGS. 5A to 5D are schematic diagrams sequentially showing steps of the method of manufacturing the light guide plate integrated trim panel for the vehicle according to the present disclosure.

(6) FIG. 6 is a flowchart showing the method of manufacturing the light guide plate integrated trim panel for the vehicle according to the present disclosure.

DESCRIPTION OF SPECIFIC EMBODIMENTS

(7) Hereinafter, a light guide plate integrated trim panel for a vehicle and a method of manufacturing the same according to the present disclosure will be described in detail with reference to the accompanying drawings.

(8) A trim panel for a vehicle according to the present disclosure includes a light guide plate 21 configured to diffuse light emitted from a light source 25, and a base 22 formed to surround the circumference and the bottom surface of the light guide plate 21.

(9) The light guide plate 21 is made of a thin synthetic resin material. Since the light guide plate 21 is thin and has a film shape (for example, 0.4 mm to 1.5 mm in thickness), the light guide plate 21 can be easily deformed according to the shape of the mold. The light guide plate 21 is made of a polycarbonate material having good light transmittance so that light emitted from the light source is evenly diffused.

(10) The base 22 is injected by the manufacturing method to be described later with the light guide plate 21 inserted, thereby becoming a trim panel of the vehicle. The base 22 is adhered to the circumference and the bottom surface of the light guide plate 21. The base 22 and the light guide plate 21 are not adhered by using an adhesive agent, but adhered by injecting the base 22 with the light guide plate 21 inserted.

(11) In particular, the present disclosure is a structure in which the circumference of the light guide plate 21 is formed to be stepped and the base 22 holds the light guide plate 21, thereby preventing the light guide plate 21 and the base 22 from being peeled off.

(12) The trim panel for the vehicle can be mounted to a vehicle interior, for example, the door trim 11. The light emitted by the light source 25 with the trim panel mounted can be diffused by the light guide plate 21, thereby illuminating the vehicle interior. By injecting the base 22 later with the light guide plate 21 inserted, it is possible to easily manufacture a curved surface, and even after time elapses, the light guide plate 21 and the base 22 are not peeled off from each other.

(13) When the light is emitted from the light source 25 such as an LED lamp by the light guide plate 21, the light can be diffused to the entire region of the light guide plate 21, and then can illuminate the vehicle interior, thereby enhancing the vehicle interior.

(14) Since the light guide plate 21 and the base 22 are manufactured by the same upper mold 31, first lower mold 32, and second lower mold 33, the light guide plate 21 and the base 22 also have the same curved shape.

(15) A method of manufacturing the light guide plate integrated trim panel for the vehicle according to the present disclosure will be described with reference to FIGS. 5 and 6 as follows.

(16) The method of manufacturing the light guide plate integrated trim panel for the vehicle according to the present disclosure includes seating the light guide plate 21 on the bottom surface of the upper mold 31 (S110), closing the lower mold which ascends the first lower mold 32 and the second lower mold 33 installed to be movable upward and downward below the upper mold 31 (S120), first injecting which forms a part of the base 22 on the circumference of the light guide plate 21 by injecting a molten resin between the upper mold 31 and the first lower mold 32 (S130), opening the second lower mold which descends the second lower mold 33 so that the second lower mold 33 contacting the bottom surface of the light guide plate 21 is spaced apart from the bottom surface of the light guide plate 21 (S140), and second injecting which injects the molten resin between the light guide plate 21 and the second lower mold 33 (S150).

(17) The seating of the light guide plate (S110) seats the light guide plate 21 on the bottom surface of the upper mold 31 (see FIG. 5A).

(18) The light guide plate 21 maintains its inserted state when the base 22 is injected. Unlike a metal material such as steel, the light guide plate 21 made of a synthetic resin material needs to be applied with a structure capable of maintaining the seated state. To this end, by forming a plurality of air holes 31a capable of penetrating the upper mold 31 in the upper mold 31, and allowing the interior of the air hole 31a to become a negative pressure, the light guide plate 21 maintains the state seated on the bottom surface of the upper mold 31. For example, the air hole 31a is connected to a negative pressure generating member 34 configured to generate negative pressure to allow the interior of the air hole 31a to become the negative pressure, thereby maintaining the seated state. Here, the negative pressure generating member 34 can be a vacuum pump.

(19) The air holes 31a are preferably formed at regular intervals with respect to the area where the light guide plate 21 has been seated, such that the light guide plate 21 is seated on the bottom surface of the upper mold 31 at an even adsorption force, and is not pushed by the injection pressure in the first injecting (S130) and the second injecting (S150).

(20) The closing of the lower mold (S120) moves the first lower mold 32 and the second lower mold 33 together to the upper mold 31 side so that an interval between the first lower mold 32 and the second lower mold 33 and the upper mold 31 becomes narrow (see FIG. 5A).

(21) In the closing of the lower mold (S120), the first lower mold 32 moves to be spaced apart from the upper mold 31 at an interval corresponding to the thickness of the base 22, and the second lower mold 33 moves to contact the bottom surface of the light guide plate 21.

(22) The first lower mold 32 and the second lower mold 33 are formed to be movable upward and downward individually below the upper mold 31. The side surfaces of the first lower mold 32 and the second lower mold 33 are in close contact with each other. The first lower mold 32 is located outside the second lower mold 33.

(23) Accordingly, the first lower mold 32 moves to be spaced apart from the upper mold 31, and the second lower mold 33 is in close contact with the bottom surface of the light guide plate 21, such that the second lower mold 33 serves to support the lower portion of the light guide plate 21. In addition, the base 22 is formed on the circumference of the light guide plate 21 by injection.

(24) In the present disclosure, although it is shown that the molding surfaces of the upper mold 31, the first lower mold 32, and the second lower mold 33 have been formed in a plane, they are formed in curved surfaces correspondingly if the trim panel needs to be formed in a curved surface.

(25) The first injecting (S130) forms a part of the base 22 on the circumference of the light guide plate 21 by injecting a molten resin between the upper mold 31 and the first lower mold 32.

(26) The base 22 is formed in a shape of covering the circumference and the bottom surface of the light guide plate 21, and since the bottom surface of the light guide plate 21 is closed by the second lower mold 33, the first injecting (S130) can perform the injection by injecting the molten resin only between the upper mold 31 and the first lower mold 32.

(27) At this time, as shown in an enlarged diagram of FIG. 5B, since the circumference of the light guide plate 21 is closed vertically by the upper mold 31 and the second lower mold 33, the resin injected between the upper mold 31 and the first lower mold 32 is also injected between the upper mold 31 and a stepped site (see arrow).

(28) Since the light guide plate 21 is constrained by the upper mold 31 and the second lower mold 33, the light guide plate 21 is not pushed in the first injecting (S130).

(29) Meanwhile, the first injecting (S130) also includes a state of curing the resin.

(30) The opening of the second lower mold (S140) descends the second lower mold 33 so that the second lower mold 33 contacting the bottom surface of the light guide plate 21 is spaced apart from the bottom surface of the light guide plate 21 (see FIG. 5C).

(31) Since it is a state of having formed a part of the base 22 by injection-molding the circumference of the light guide plate 21 with the resin, the second lower mold 33 is descended so that an interval is formed between the light guide plate 21 and the second lower mold 33 in order to form the base 22 on the bottom surface of the light guide plate 21.

(32) The second injecting (S150) injects the molten resin between the light guide plate 21 and the second lower mold 33 (see FIG. 5D).

(33) In the second injecting step (S150), when the molten resin is injected between the light guide plate 21 and the second lower mold 33, the base 22 is formed on the bottom surface of the light guide plate 21 and at the same time, the base 22 formed on the circumference of the light guide plate 21 in the first injecting (S130) is integrally formed. Since the area of the upper surface of the second lower mold 33 is formed larger than the area of the light guide plate 21, the base 22 molded in the first injecting (S130) is also exposed to a space formed by descending the second lower mold 33. Accordingly, when the second injecting (S150) is performed, the base 22 is formed on the bottom surface of the light guide plate 21 and at the same time, the base 22 already formed is integrally formed.

(34) Meanwhile, the second injecting step (S150) also includes a state of curing the resin.

(35) Take out panel (S160) takes out the trim panel by opening the first lower mold 32 and the second lower mold 33 from the upper mold 31 when the molding of the trim panel is completed by the upper mold 31, the first lower mold 32, and the second lower mold 33.

(36) The trim panel can be mounted to one side of the vehicle interior, for example, the door trim 11, thereby obtaining the surface light emission effect.

(37) Meanwhile, the surface of the trim panel, in particular, the surface of the base 22 can be attached with a film having a pattern or a color, or the like, or can be finished with a finishing material for texture or touch.

(38) In the present disclosure, the base 22 is formed by injection with the light guide plate 21 inserted between the upper mold 31, the first lower mold 32, and the second lower mold 33, thereby manufacturing the trim panel in the adhered state without the adhesive agent.

(39) In particular, when the trim panel has a curved shape, since the trim panel is manufactured by the same upper mold 31, first lower mold 32, and second lower mold 33, the light guide plate 21 and the base 22 have the same curved shape, such that the adhered site of the light guide plate 21 and the base 22 is not separated even after time elapses.