JP2015036742A - Light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device that can display any position of a design body by light emission without being restricted by the position of light sources (LEDs), and can increase the amount of light guided to the design body.SOLUTION: A light emitting device includes a design body 10, light sources 13 and 13', and a light guide body 15 that guides the light emitted from the light sources 13 and 13' arranged in this order from the front side to the rear side, where the light guide body 15 has a high luminance part 15b formed thereon emitting a larger amount of light compared with other parts.

Description

  The present invention relates to a light-emitting device that illuminates and decorates a part or all of various design bodies by emitting light, and in particular, uses a light guide in addition to a light source to display and emit light so as to emit surface light or line light. The present invention relates to a light emitting device to be decorated.

  Conventionally, an emblem (logo, mark, etc.) that represents the vehicle name, company name, brand name, etc. on the front or rear of the car in order to enhance the design of the appearance of the vehicle or display the vehicle name, brand name, logo, etc. ) Is attached, but in order to emphasize this emblem, add a sense of quality, or enhance visibility at night, part or all of the emblem is lit or illuminated Things have been done.

  As this type of light emitting device, there has conventionally been a light emitting device in which an LED (light emitting diode) is used as a light source and a transparent or translucent light guide is arranged to guide and diffuse light emitted from the LED. Are known. Depending on the arrangement position of the LED with respect to the light guide, for example, an edge light method in which the LED is arranged to irradiate light on the side surface of the light guide, or a light source method in the light guide in which the LED is arranged in the light guide Various light emission methods are known.

Patent document 1 arrange | positions LED used as a light source in the recess of the design body which forms the external shape of an emblem, irradiates light toward the light guide body arrange | positioned under the design body, and the irradiated light However, a light emitting device is disclosed in which the outer edge portion of the design body emits light by being reflected into the light guide body by being reflected by the side surface of the substantially conical through-hole formed in the light guide body in advance. .
By adopting such a configuration, even if the number of LEDs as the light source is reduced, uniform light emission can be enhanced, and it is not necessary to provide a space for disposing the LEDs, and it is thin and space-saving. Can be achieved.

JP2012-83520A

  In the light emitting device disclosed in Patent Document 1 in which the design body, the light source, and the light guide are arranged in this order, the light guide disposed on the rear side of the design body from the LED disposed in the recess of the design body. Since the light is emitted toward the body, that is, the side opposite to the design body, the LED and the design body behind the substrate on which the LED is mounted cannot emit light.

  In the light emitting device disclosed in Patent Document 1, a sheet body including a light transmission region and a light non-transmission region is disposed between the light guide body and the design body so as to partially shield light. Thus, only a specific portion (outer edge of the design body) is caused to emit light, but it cannot be said that the luminance is sufficient.

  The objective of this invention is providing the light-emitting device which can increase the light guide quantity to a design body.

  In order to solve the above-described problems, a light-emitting device according to the present invention includes a design body, a light source, and a light guide that guides light emitted from the light source, arranged in this order from the front side to the back side. In the light emitting device, the light guide body is formed with a high brightness portion that emits a large amount of light toward the design body as compared with other portions.

  According to this configuration, by providing a high brightness portion with a large light emission amount in a part of the light guide, it is possible to display and emit light at an arbitrary location, or to increase the light emission amount from a specific location. It is possible to supply and guide a lot of light to the body.

  In the present invention, it is preferable that the high brightness part has a convex part protruding from the surface of the light guide. According to this configuration, the bright portion can be provided only by forming the convex portion integrally on the surface of the light guide. Further, compared to the case where a groove shape such as a V-shape is provided, there is no possibility of causing a problem that the groove shape is filled with water due to water intrusion and the optical function is lost.

  In the present invention, at least a part of the design body includes a light guide portion made of a transparent or translucent material capable of guiding light, and is provided on the convex portion and the light guide portion. It is preferable that at least a part of the light incident surface is disposed so as to overlap in a direction orthogonal to the surface of the design body and the light guide body. According to this configuration, since the light emitted from the high brightness part is guided into the light guide part from the light incident surface of the light guide part, the light source is located behind the light source (on the side opposite to the light emission direction). It is possible to light-display the design body (positioned at).

  In this invention, while the said convex part is continuously formed in the said light guide so that the edge part of the said light guide part may be followed, with respect to the width direction centerline of the said light-incidence surface of the said light guide part In addition, it is preferable that the center line in the width direction of the convex portion is arranged to be biased toward the light source side. According to this configuration, since the amount of light emitted from the high brightness portion is taken in from the end face of the design body, the use efficiency of the light emitted from the light source is increased.

  In the present invention, a groove having substantially the same width as the light incident surface of the light guide may be formed on the back side of the high brightness portion of the light guide. According to this configuration, it is possible to further increase the amount of light emitted from the high brightness portion.

  In the present invention, an inclined portion may be formed on the outer ring portion of the design body that is spaced apart from the light guide portion so as to face the end face of the light guide. According to this configuration, since the light emitted from the end surface of the light guide is reflected by the inclined portion formed at the position facing the end surface of the light guide of the outer ring portion of the design body, the inclined portion Emits light to form a third high-brightness portion, and the inclined portion emits light in a line shape, thereby further improving the design of the light-emitting device.

  In this invention, a recessed part is formed in the back surface side of the said light guide part, and the said light source may be arrange | positioned in this recessed part. According to this configuration, since the light source is accommodated in the recess of the light guide unit, the light emitting device can be thinned.

  In the present invention, the light guide part may be formed with an annular seal projection that projects toward the surface of the light guide so as to surround the recess and seals the gap with the light guide. According to this configuration, it is possible to prevent water and the like from entering the internal space in which the light source and the base are accommodated.

  In the light-emitting device of the present invention, the light guide is formed with a high brightness portion that emits a large amount of light compared to other parts. By increasing the number, it becomes possible to supply and guide a large amount of light to the design body.

1 is a perspective view of an emblem illumination according to an embodiment of a light emitting device of the present invention. It is the perspective view which decomposed | disassembled and showed the emblem illumination to the component part. It is the perspective view which removed the design body of the emblem illumination and permeate | transmitted and showed the light guide part. It is the perspective view which showed the light guide which is one of the components of the emblem illumination. It is the perspective view which looked at the emblem illumination from the back side. It is sectional drawing cut | disconnected by the AA line of FIG. It is sectional drawing to which the high brightness part vicinity provided with the convex part formed in the surface of the light guide in FIG. 6 was expanded. It is sectional drawing which showed the other Example of the high brightness part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment in which the present invention is applied to an emblem illumination 1 which is a light emitting device disposed outside a vehicle. 2 is an exploded perspective view showing components of the emblem illumination 1 shown in FIG.

  The emblem illuminator 1 of FIG. 1 includes a design body 10 forming the outer shape of the emblem, a light guide 11 integrated in the center of the design body 10, a base 12 shown in FIG. LEDs 13 and 13 ′ (light source), a harness 14 connected to the base 12, a light guide 15 that guides light emitted from the LEDs 13 and 13 ′, and a harness formed on the light guide 15 14 is provided with a grommet 16 fitted in the insertion hole for sealing the insertion hole for insertion, and a double-sided tape 17 for bonding and sealing the light guide 15 and the design body 10.

[Design body (emblem)]
The design body 10 constitutes an appearance of the emblem illumination 1 and is formed to be a logo or a mark such as a car model or a company name of an automobile. The design body 10 is formed by injection molding a resin material such as ABS, and then subjected to silver plating to enhance the design. In the present embodiment, the design body 10 is formed so as to be non-translucent that has been subjected to silver plating, but is not limited thereto, and part or all of the design body 10 is transparent or translucent. For example, it may be formed so as to be light-transmitting.
As shown in FIG. 2, the design body 10 includes an inner ring portion 10a and an outer ring portion 10b, and two bridging portions 10c and 10c ′ that connect the inner ring portion 10a and the outer ring portion 10b. In addition, an opening 10d that is opened in a circular shape is formed inside the inner ring portion 10a, and two gaps 10e and 10e 'are formed between the inner ring portion 10a and the outer ring portion 10b. Yes.

[Light guide (lens)]
The light guide unit 11 is a translucent translucent molded product formed by injection-molding polycarbonate (PC) colored in green, and a recess 11e (FIG. 6) is formed inside the light guide unit 11. The recess 11e also functions as a storage space. The light guide unit 11 guides light incident on the light guide unit 11 and emits green light. In this embodiment, although it is colored green, it is not restricted to this, Other colors, such as red and blue, may be transparent, or translucent.

  After the light guide 11 is screwed and fixed to the light guide 15, the light guide 15 is bonded and fixed to the design body 10 by the double-sided tape 17. At this time, the light guide 11 is fitted and fixed to the opening 10 d of the design body 10. Thereby, the inner ring part 10 a which is a part of the design body 10 includes the light guide part 11. In the present embodiment, the design body 10 and the light guide portion 11 are separately formed and then fitted and integrated. However, the present invention is not limited to this, and the light guide portion 11 may be insert-molded into the design body 10. . By adopting such a configuration, the light guide unit 11 and the design body 10 are integrated without any gaps, so that the sealing performance of the emblem illumination 1 is significantly improved, and the interior of the light guide unit 11 is increased. This is preferable because the risk of water intrusion can be significantly reduced.

[Base, LED]
As the light source of the emblem illumination 1, two LEDs 13 and 13 ′ are used. The LEDs 13 and 13 'are mounted on a substrate 12 made of glass epoxy resin. In the present embodiment, the number of LED lamps is two, but is not limited to this and may be one or three or more. The present invention is characterized in that an arbitrary portion of the emblem illuminator 1 can be made to emit light with only a few LEDs.

The base 12 on which the LEDs 13 and 13 ′ are mounted is fixed to the light guide 15 with screws. Although not shown, the base 12 is a boss formed by projecting a screw (screw body) into each of two insertion holes formed in the base 12 and projecting in a cylindrical shape on the surface of the light guide 15. The light guide 15 is fixed by being screwed into the part. At this time, as shown in FIG. 6, the base 12 is disposed so that the side on which the LEDs 13 and 13 ′ are mounted faces the light guide 15. That is, the light emitted from the LEDs 13 and 13 ′ is irradiated toward the light guide 15.
The LEDs 13 and 13 ′ used in this embodiment are white LEDs (trade name: NS2W150) manufactured by Nichia Chemical, but are not limited to this, and may be other colors such as a red LED and a blue LED. Color change display may be performed using an LED.

  As shown in FIG. 3, a harness 14 is connected to the base 12, and the harness 14 is connected to the vehicle body side through an insertion hole 15 e formed in the light guide 15. At this time, the harness 14 is passed through the grommet 16, and the grommet 16 is fitted into the insertion hole 15 e of the light guide 15, thereby improving the sealing performance. The grommet 16 is preferably made of a flexible and waterproof material such as rubber. However, the grommet 16 may be sealed by pouring and coagulating a viscous liquid. In this case, the watertightness is further improved, which is preferable.

  As shown in FIG. 6, the light guide portion 11 of the design body 10 has a concave portion 11 e forming a hollow accommodating space therein, and the base 12 and the LEDs 13 and 13 ′ are accommodated in the concave portion 11 e. The For this reason, it is not necessary to provide a separate housing space for the base 12 and the LEDs 13 and 13 ′, so that space saving and thinning can be achieved, and an increase in the number of components can be avoided.

[Light guide (light guide plate)]
FIG. 4 is an enlarged perspective view of the light guide 15. The light guide 15 is formed by injection molding a translucent polycarbonate (PC) resin having scattering particles. Convex portions 15b that protrude integrally from the surface 15a are continuously formed on the surface 15a of the light guide 15 so as to have substantially the same outer diameter as the outer peripheral edge of the circular light guide 11 of the design body 10. Has been. Further, through holes 15d and 15d ′ are formed so as to penetrate from the front surface 15a to the back surface 15c of the light guide 15 so as to face the arrangement positions of the LEDs 13 and 13 ′. That is, the LEDs 13 and 13 ′ serving as the light source shown in FIG. 6 are arranged close to each other so as to face the through holes 15d and 15d ′, and the light L emitted from the LEDs 13 and 13 ′ is the through holes 15d and 15d ′. Irradiated towards. The distance H1 between the LEDs 13 and 13 'and the surface 15a of the light guide 15 is preferably 1.0 mm or less, more preferably 0.5 mm or less. If space cannot be reduced to this range due to space limitations, the light guide 15 may be formed so that only the portions where the through holes 15d and 15d 'are formed protrude.

  As shown in FIG. 4, the convex portion 15b is formed in an annular shape, but an opening portion 15j that is partly interrupted without the convex portion 15b being formed is formed in the vicinity of the insertion hole 15e. The harness 14 connected to the base 12 is passed through the opening 15j, inserted into the insertion hole 15e, and connected to the outside of the emblem illuminator 1.

  As the light guide 15, an acrylic resin, a polypropylene resin, a polyethylene resin, a silicon resin, or the like can be substituted for the above polycarbonate resin. Moreover, it does not matter if it is not a translucent resin, but may be a transparent resin that does not contain scattering particles. FIG. 5 is a perspective view of the emblem illumination 1 viewed from the back side. The light guide 15 is formed to have substantially the same outer shape as the opening 10d, the inner ring portion 10a, and the bridge portions 10c and 10c ′ of the design body 10, and the opening 10d and the inner ring of the design body 10 from the back side. The portion 10 a and the bridging portions 10 c and 10 c ′ are covered, and light L is emitted to the design body 10.

[Through hole]
As shown in FIG. 6, the through holes 15 d and 15 d ′ of the light guide 15 have a larger opening diameter on the back surface 15 c on the opposite side than the opening diameter of the surface 15 a on the LED 13 and 13 ′ side. The inner side surfaces of the holes 15d and 15d ′ have a substantially conical shape in which the hole diameter gradually increases from below the light guide 15 (from the front surface 15a to the back surface 15c). The through holes 15d and 15d ′ have an opening diameter D1 of 0.4 to 1.0 mm, more preferably 0.6 to 0.8 mm, on the front surface 15a of the light guide 15. It is preferable that the hole diameter D2 of the opening is in the range of 1.0 to 4.0 mm, more preferably in the range of 2.0 to 3.0 mm, because the utilization efficiency of the light L emitted from the LEDs 13 and 13 ′ is maximized. It is.

  By providing the through-holes 15d and 15d ', the light L emitted from the LEDs 13 and 13' passes through the through-holes 15d and 15d 'and is discarded to the outside. The light is diffracted at the inner side surfaces of the holes 15 d and 15 d ′ and guided into the light guide 15. Thereby, it is possible to suppress the occurrence of uneven light emission due to the local increase in the amount of light emitted from directly below the LEDs 13 and 13 ′. Moreover, it is preferable that the inner side surfaces of the through-holes 15 and 15 ′ are formed to have a curved shape bulging so as to protrude inward. By adopting such a shape, from the LEDs 13 and 13 ′ The utilization efficiency of the irradiated light L can be further increased. It is preferable that the back surface 15c of the light guide body 15 is subjected to a dot pattern or embossing, or white printing or painting. With such a configuration, since the light L is reflected by the back surface 15c of the light guide 15, light can be prevented from being emitted from the back surface 15c, so that the utilization efficiency of the light L can be further increased.

[High brightness part]
A first high brightness portion having a larger light L emission amount than the general surface of the surface 15a is formed by the convex portion 15b formed in an annular shape on the surface 15a of the light guide 15. The convex portion 15 b increases the amount of light toward the light guide portion 11 that is a part of the design body 10. In the present embodiment, the convex portion 15b is formed in a continuous rib shape, but is not limited to this, and a plurality of the convex portions 15b may be provided intermittently, not in an annular shape, but in an ellipse or a polygon. , Any shape such as logo or mark shape can be used.

  Conventionally, when such a bright portion is formed, for example, a V-groove shape is formed on the back surface 15c side of the light guide 15 to reflect and refract the light. Water entered the V-groove-shaped part of the body 15 and filled the groove part, resulting in a problem that the function of reflecting and refracting light was lost or lowered. In particular, in an exterior part such as the emblem illumination 1 of the present embodiment, it is necessary to take measures against such a problem. However, as in the present embodiment, a convex shape that protrudes toward the surface 15a of the light guide 15 is provided. If the high brightness portion is formed by providing the portion 15b, it is possible to prevent performance degradation due to intrusion of water or the like as much as possible.

  As shown in FIG. 7, the light incident surface 11 a that is the end surface of the light guide 11 is formed in the direction in which the convex 15 b faces, that is, in the direction in which the convex 15 b protrudes from the surface 15 a of the light guide 15. The light guide 11 and the light guide 15 are arranged so that is positioned. That is, at least a part of the convex part 15 b and at least a part of the light incident surface 11 a provided in the light guide part 11 overlap in a direction perpendicular to the surfaces of the design body 10 and the light guide body 15. It is arranged. With such a configuration, the light emitted from the convex portion 15 b is guided from the light incident surface 11 a of the light guide portion 11 into the light guide portion 11.

  The light that has entered the light guide unit 11 is guided while being reflected and refracted in the light guide unit 11, and is emitted from the surface 11 b of the light guide unit 11 to the outside, so that the entire light guide unit 11 is made. Emits light and decorates the emblem illuminator 1 to provide design, luxury and night visibility. At this time, it is preferable that the back surface 11c of the light guide portion 11 is subjected to a textured process. In this case, the light guided through the light guide 11 is reflected by the back surface 11c and increases in the direction toward the front surface 11b, so that the brightness, uniformity, and light utilization efficiency of the light guide 11 are improved. Enhanced.

  The convex portion 15b of the light guide 15 has a center line L2 in the width direction of the convex portion 15b that is the light source surface 11a. It is characterized by being arranged biased toward the LEDs 13 and 13 '. Such a configuration is preferable because the amount of light taken from the light incident surface 11a of the light guide portion 11 is increased with respect to the light emitted from the convex portion 15b, and the light use efficiency is improved. In the present embodiment, the center line L2 in the width direction of the convex portion 15b is disposed so as to coincide with the inner side surface 11f of the light guide portion 11.

  The shape of the convex portion 15b has a semicircular cross section. In this case, the radius R1 of the cross section of the convex portion 15b is preferably in the range of 0.5 to 1.5 mm. More preferably, it is in the range of 1.2 mm. In the present embodiment, the protrusion 15b is formed so as to protrude in a semicircular shape having a radius R1 = 1.0 mm. Here, in the convex part 15b, the corner part 15f connected to the surface 15a of the light guide part 15 on the light source side is formed in a curved shape having a curvature R2 = 0.5 mm. By adopting such a configuration, it is possible to increase the amount of light emitted from the convex portion 15b out of the light irradiated from the LEDs 13 and 13 ′ of the light source and guided in the light guide 15. The brightness of the light guide unit 11 can be increased. The shape of the corner portion 15f is not limited to this, and the amount of light incident on the convex portion 15b can be adjusted by changing the shape of the corner portion 15f, such as a linear inclined surface.

  Moreover, in this embodiment, although the convex part 15b is formed in the semicircle shape in the cross section, it is not restricted to this, A cross section can be substituted by arbitrary shapes, such as an ellipse and a polygon.

  The light guide portion 11 is formed with an annular seal protrusion 11 d that protrudes toward the surface 15 a of the light guide 15. The distance H2 between the tip end of the annular seal projection 11d and the surface 15a of the light guide 15 is arranged close to be 0.5 mm or less, whereby the LEDs 13, 13 'serving as light sources in the emblem illumination 1 are arranged. Intrusion of water into the internal space in which the base 12 is housed is prevented.

  The light guide 15 is formed so as to be substantially along the outer periphery of the inner ring portion 10 a of the design body 10, but as shown in FIGS. 5 and 6, the end of the light guide 15 is formed on the design body 10. It is formed so as to slightly protrude from the end of the inner ring portion 10a. Moreover, in the edge part of the light guide 15, the 1st inclined surface 15g shown in FIG. 6 is formed in the back surface 15c side corner part of the light guide 15, and a 2nd inclination is provided in the surface 15a side corner part. A surface 15h is formed. The light L guided through the light guide 15 is reflected and refracted by the first inclined surface 15g and the second inclined surface 15h, and the light L is emitted from the general surface of the surface 15a of the light guide 15. A large amount of the second high-brightness part is formed. Note that the second inclined surface 15h may be omitted.

  FIG. 8 shows another embodiment of the first bright portion. The first high brightness portion in the present embodiment is characterized in that the convex portion 15b is formed to protrude on the front surface 15a side of the light guide 15 and a groove portion 15i is formed on the back surface 15c side of the light guide 15. To do. By forming the groove 15i, the light guided through the light guide body is reflected and refracted by the groove 15i, so that the amount of light emitted from the convex portion 15b is further increased.

  As shown in FIG. 6, the first inclined surface 15g and the second inclined surface 15g of the light guide 15 are formed on the inner peripheral surface of the outer ring portion 10b that is located apart from the inner ring portion 10a of the design body 10. An inclined portion 10f is formed so as to face the end surface between the inclined surface 15h. The inclined portion 10f is formed of a surface inclined radially outward toward the surface 15a side of the design body 10, and the inclined portion formed by the light L emitted from the end surface of the light guide 15 on the outer ring portion 10b. The third high brightness portion is formed by reflecting and refracting the surface of the design body 10 by 10f.

  As described above, the light emitting device according to the present invention can illuminate the side opposite to the light emission direction from the light source in a planar shape by arranging the design body, the light source, and the light guide in this order.

  The preferred embodiments of the present invention have been described above with reference to the drawings. However, various additions, modifications, or deletions can be made without departing from the spirit of the present invention. Included in range.

1: Emblem illumination (light emitting device)
10: Design body 10a: Inner ring part 10b: Outer ring part 10c, 10c ′: Cross-linked part 10d: Opening part 10e, 10e ′: Gap 10f: Inclined part (third high brightness part)
11: Light guide 11a: Recess 11b: Front surface 11c: Back surface 11d: Annular seal protrusion 11e: Recess 12: Base 13, 13 ': LED (light source)
14: Harness 15: Light guide 15a: Surface 15b: Convex part (first high brightness part)
15c: Back surface 15d, 15d ′: Through hole 15e: Insertion hole 15f: Corner portion 15g: First inclined surface (second high brightness portion)
15h: Second inclined surface (second high brightness portion)
15i: Groove 15j: Passage 16: Grommet 17: Double-sided tape

Claims (8)

In the light emitting device in which the design body, the light source, and the light guide for guiding the light emitted from the light source are arranged in this order from the front side to the back side,
The light-emitting device is characterized in that a high-brightness part is formed in which the amount of light emitted toward the design body is larger than that of other parts.   The light-emitting device according to claim 1, wherein the high-brightness part has a convex part protruding from a surface of the light guide.   At least a part of the design body includes a light guide portion made of a transparent or semi-transparent material capable of guiding light, and includes a convex portion and a light incident surface provided on the light guide portion. The light emitting device according to claim 2, wherein at least a part of the light emitting device is disposed so as to overlap in a direction orthogonal to the surfaces of the design body and the light guide.   The convex portion is continuously formed on the light guide body along the end portion of the light guide portion, and the convex portion with respect to the center line in the width direction of the light incident surface of the light guide portion. The light emitting device according to claim 3, wherein a center line in a width direction of the portion is arranged to be biased toward the light source side.   5. The light emitting device according to claim 3, wherein a groove portion having substantially the same width as the light incident surface of the light guide portion is formed on the back surface side of the high brightness portion of the light guide body. .   The inclined part is formed in the outer ring part located apart from the outside of the light guide part of the design body so as to face the end face of the light guide body. The light-emitting device according to claim 5.   The light-emitting device according to claim 3, wherein a concave portion is formed on a back surface side of the light guide portion, and the light source is disposed in the concave portion.   8. The annular light-projecting portion according to claim 7, wherein the light-guiding portion is formed with an annular sealing protrusion that projects toward the surface of the light guide so as to surround the recess and seals a gap between the light guide and the light guide. Light emitting device.

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