JP2013205530A - Emblem light-emission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emblem light-emission device capable of being thinned and having radiation properties improved as well as achieving light emission of uniform intensity with suppressed color irregularities by efficiently using light from an LED.SOLUTION: An emblem light-emission device 1, which causes light from an LED 5 to pass through a translucent part 10b of an emblem 10 having a light-shielding part 10a and the translucent part 10b and causes the translucent part 10b to emit light, has a configuration in which: a light-guiding plate 2 is arranged on the rear surface of the emblem 10; a substrate 4 is arranged on the rear side of the light-guiding plate 2; the LED 5 mounted on the substrate 4 is arranged in a recess 2a formed on the rear surface of the light-guiding plate 2; a reflector 6 is placed between the substrate 4 and the light-guiding plate 2; and a reflector 3 (or a diffusion material) is placed between the emblem 10 and the light-guiding plate 2.

Description

  The present invention relates to an emblem light emitting device that emits light from an LED at the periphery of an emblem.

  For example, an emblem that displays the manufacturer name, model name, grade, etc. is attached to the body of the vehicle, and the periphery of the emblem is made to emit light in order to improve the visibility of the emblem at night. Yes.

  As a light emitting device for emitting an emblem, a device that emits light by allowing light from an LED to pass through a light transmitting portion of the emblem is used. For example, Patent Document 1 proposes a device as shown in FIG. Has been.

  7 is a cross-sectional view of the main part of the emblem light emitting device proposed in Patent Document 1. In the illustrated emblem light emitting device 101, the entire circumference of the inner peripheral surface of the casing 111 disposed on the back side of the emblem 110 is shown. A flexible substrate 112 is arranged on the flexible substrate 112, and a plurality of LED chips 113 are provided on the flexible substrate 112 at appropriate intervals in the circumferential direction. A diffusion plate 114 is bonded to the back surface of the emblem 110, and a milky white coating film 115 is formed on the bottom surface of the casing 111.

  In such an emblem light emitting device 101, when each LED chip 113 is energized and the LED chip 113 emits light, the light is reflected by the coating film 115 formed on the bottom surface of the casing 111 and travels toward the diffusion plate 114. A part of the light is diffused by the diffusion plate 114 and passes through the cut-out portion 110 a of the emblem 110 to emit light at the periphery of the emblem 110. According to the emblem light emitting device 101, light with strong directivity emitted from the LED chip 113 is reflected and diffused by the coating film 115, and the reflected light is further diffused by the diffusion plate 114, thereby reducing the directivity. Therefore, uniform and elegant light emission can be realized.

  Patent Document 2 proposes an emblem light emitting device as shown in FIG.

  That is, FIG. 8 is a cross-sectional view of the main part of the emblem light emitting device proposed in Patent Document 2. In the illustrated emblem light emitting device 201, the light is emitted from the LED light source 205 disposed above the columnar body 202A of the light guide plate 202. The transmitted light propagates inside the columnar body 202A of the light guide plate 202, and this light is reflected by the hemispherical concave portion 202a formed directly below the columnar body 202A and diffused in the horizontal direction. Is emitted, and the light passes through a hollow portion (translucent portion) of the emblem (not shown) to emit light at the periphery of the emblem.

Utility Model Registration No. 3169564 Japanese Patent No. 4790095

  However, in the emblem light emitting devices 101 and 201 proposed in Patent Documents 1 and 2, light from the LEDs 113 and 205 that are light sources is not efficiently used, and an attempt is made to emit light at a position away from the LEDs 113 and 205. It was difficult to do. In order to solve this problem, it is necessary to increase the number of LEDs 113 and 205.

  In addition, in order to realize uniform light emission in the conventional emblem light emitting device, a certain distance and thickness are required. Like the emblem light emitting device 101 shown in FIG. When the configuration arranged on the peripheral surface is employed, the heat dissipation of the LED chip 113 cannot be performed efficiently.

  Furthermore, in the conventional emblem light-emitting device, color unevenness occurs in the light due to unevenness of the phosphor of the LED, resulting in a decrease in light emission quality.

  The present invention has been made in view of the above problems, and the object of the present invention is to realize light emission with uniform intensity while efficiently suppressing the color unevenness by efficiently using the light from the LED, and reducing the thickness and heat dissipation. An object of the present invention is to provide an emblem light emitting device capable of improving the above.

  In order to achieve the above object, the invention according to claim 1 is an emblem light emitting device that causes light from an LED to pass through the light transmitting portion of the emblem having a light shielding portion and a light guiding portion, and emits the light transmitting portion. A light guide plate is disposed on the back surface of the emblem, a substrate is disposed on the back surface of the light guide plate, and the LED mounted on the substrate is disposed in a recess formed on the back surface of the light guide plate. A reflection material is interposed between the light guide plate and a reflection material or a diffusion material is interposed between the emblem and the light guide plate.

  According to a second aspect of the present invention, in the first aspect of the present invention, the periphery of the light guide plate is surrounded by a reflective material.

  According to the first aspect of the present invention, the light emitted from the LED and incident on the light guide plate is uniformly reflected in the light guide plate by the reflection material, and the unevenness in color is reduced. Since it can be efficiently used for light emission of the emblem, it is possible to emit light of a uniform emblem without color unevenness. In particular, by interposing a diffusing material between the emblem and the light guide plate, light directed toward the emblem can be diffused in multiple directions, so that the emblem can emit more uniform and high quality light.

  Moreover, since the substrate can be enlarged in terms of layout, the heat from the LED can be efficiently dissipated from the substrate having a large area (heat radiation area), and the heat radiation performance of the emblem light emitting device is enhanced so that the LED is efficient. Cools well and suppresses temperature rise.

  Furthermore, since a concave portion is formed on the back surface of the light guide plate, and the LED is disposed in the concave portion, light emitted from the side of the LED can be incident into the light guide plate from the concave portion of the light guide plate. The light emitting device can be downsized.

  According to the second aspect of the present invention, since the periphery of the light guide plate is surrounded by the reflecting material, the emission of light from the periphery of the light guide plate to the outside is prevented, and the light from the LED is used more efficiently for light emission of the emblem. It is possible to make all of the light from the LED diffusely reflected in the light guide plate to make it uniform, and to reduce the color unevenness more effectively.

It is a front view of an emblem. It is sectional drawing of the emblem light-emitting device which concerns on Embodiment 1 of this invention. 1 is an exploded cross-sectional view of an emblem light emitting device according to Embodiment 1 of the present invention. It is sectional drawing which shows the optical path | route of the emblem light-emitting device which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the optical path | route of the emblem light-emitting device concerning Embodiment 2 of this invention. It is sectional drawing of the emblem light-emitting device which concerns on Embodiment 3 of this invention. It is sectional drawing of the principal part of the light-emitting device proposed in patent document 1. FIG. It is sectional drawing of the light-emitting device principal part proposed in patent document 2. FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a front view of an emblem attached to the vehicle body of a vehicle. The illustrated emblem 10 includes a light-shielding portion 10a such as a letter indicating a logo of a vehicle manufacturer or the like (in the illustrated example, an English letter “S”) and the like. The light transmitting portion 10b is formed of a through hole, and the portion emits light when light freely passes through the light transmitting portion 10b.

  Next, an embodiment of the emblem light emitting device 1 for improving the visibility of the emblem 10 at night will be described.

<Embodiment 1>
2 is a cross-sectional view of the emblem light-emitting device according to Embodiment 1 of the present invention, FIG. 3 is an exploded cross-sectional view of the emblem light-emitting device, and FIG. 4 is a cross-sectional view showing an optical path of the emblem light-emitting device.

  In the emblem light emitting device 1 according to the present invention, as shown in FIGS. 2 and 3, an elliptical light guide plate 2 along the outer shape of the emblem 10 is disposed on the back surface of the emblem 10. A recess 2 a is formed at the center of the lower surface of the light guide plate 2. A reflective material 3 along the shape of the emblem 10 is interposed between the upper surface of the light guide plate 2 and the emblem 10. The reflective material 3 has the same shape as the light transmitting portion 10 b of the emblem 10. The slit 3a is formed as a light emitting portion.

  Further, an LED 5 mounted on the substrate 4 is disposed in the recess 2 a formed at the center of the lower surface of the light guide plate 2. A reflective material 6 is interposed between the lower surface of the light guide plate 2 and the substrate 4, and the periphery of the light guide plate 2 is surrounded by the reflective material 7.

  Thus, in the emblem light emitting device 1 configured as described above, when the LED 5 is energized and the LED 5 emits light, the light enters the light guide plate 2 as shown in FIG. , 7 by repeating reflection in the light guide plate 2, the strength is made uniform and color unevenness is reduced. And since the light which goes to the emblem 10 passes the translucent part 10b of the emblem 10 through the slit 3a of the reflecting material 3, this translucent part 10b light-emits and the visibility of the emblem 10 at night is improved.

  As described above, according to the emblem light emitting device 1 according to the first embodiment, the light emitted from the LED 5 and incident on the light guide plate 2 is repeatedly reflected in the light guide plate 2 by the reflectors 3, 6, and 7. As a result, the intensity is made uniform and the color unevenness is reduced, and the light is efficiently used for the light emission of the emblem 10. Therefore, the light emission of the uniform emblem 10 without the color unevenness becomes possible.

  Moreover, since the board | substrate 4 can be enlarged in layout, the heat | fever from LED5 can be efficiently radiated from the board | substrate 4 of a big area (heat dissipation area), and the heat dissipation of the said emblem light-emitting device 1 is improved. The LED 5 is efficiently cooled, and the temperature rise is suppressed.

  Furthermore, since the concave portion 2a is formed on the back surface of the light guide plate 2 and the LED 5 is disposed in the concave portion 2a, the light emitted from the side of the LED 5 can enter the light guide plate 2 from the concave portion 2a of the light guide plate 2. In addition, the emblem light emitting device 1 can be downsized in terms of layout.

<Embodiment 2>
Next, an emblem light emitting device according to Embodiment 2 of the present invention will be described with reference to FIG.

  FIG. 5 is a cross-sectional view showing the optical path of the emblem light emitting device according to the second embodiment of the present invention. Since the other structure is the same as that of the first embodiment, the same elements as those shown in FIGS. 2 to 4 are denoted by the same reference numerals. In the following, description thereof will be omitted.

  Thus, in the emblem light emitting device 1 according to the present embodiment, since the outer peripheral surface of the light guide plate 2 functions as a reflection surface, the light emitted from the LED 5 and incident on the light guide plate 2 is reflected by the reflectors 3 and 6. In addition, by repeating reflection in the light guide plate 2 by the outer peripheral surface of the light guide plate 2, the strength is made uniform and color unevenness is reduced. For this reason, this light can be efficiently used for the light emission of the emblem 10, and the light emission of the emblem 10 with no color unevenness is possible. In addition, the same effects as those of the first embodiment can be obtained in the present embodiment.

<Embodiment 3>
Next, an emblem light emitting device according to Embodiment 3 of the present invention will be described with reference to FIG.

  FIG. 6 is a cross-sectional view of the emblem light emitting device according to Embodiment 3 of the present invention. In FIG. 6, the same elements as those shown in FIG. Description is omitted.

  The present embodiment is characterized in that a diffusing material 8 is interposed in place of the reflecting material 3 interposed between the emblem 10 and the light guide plate 2 in the second embodiment. This is the same as that of the first embodiment.

  Thus, according to the emblem light emitting device 1 according to the present embodiment, the light directed to the emblem 10 after being repeatedly reflected in the light guide plate 2 can be diffused in multiple directions by the diffusing material 8. The effect that more uniform and high-quality light emission at the periphery of the lens becomes possible. In the emblem light emitting device 1 according to the present embodiment, the same effect as that obtained in the first and second embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1 Emblem light-emitting device 2 Light guide plate 2a Recessed portion of light guide plate 3 Reflective material 3a Slit of reflective material 4 Substrate 5 LED
6,7 Reflective material 8 Diffusing material 10 Emblem 10a Light shielding part of emblem 10b Translucent part of emblem

Claims (2)

An emblem light emitting device that causes light from an LED to pass through the light transmitting portion of the emblem having a light shielding portion and a light guiding portion, and emits the light transmitting portion,
A light guide plate is disposed on the back surface of the emblem, a substrate is disposed on the back surface of the light guide plate, and the LED mounted on the substrate is disposed in a recess formed on the back surface of the light guide plate. An emblem light emitting device comprising a reflective material interposed between a light guide plate and a reflective material or a diffusing material interposed between the emblem and the light guide plate. The emblem light emitting device according to claim 1, wherein the light guide plate is surrounded by a reflective material.

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