JP2014026000A - Emblem light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emblem light-emitting device which achieves light emission with even intensity and reduced colour unevenness by efficiently using light from an LED, and achieves reduced thickness and improvement of heat radiation property.SOLUTION: An emblem light-emitting device 1 comprises an emblem 10, a light guide plate 2 and an LED 5. The light guide plate 2 is composed of a first light guide member 2A opposing the LED 5 and a second light guide member 2B opposing the emblem 10. A primary refractive surface 2b and a secondary refractive surface 2c which are convex-shaped are respectively formed on an incident part and an emission part which are formed on an optical axis of the LED 5 of the first light guide member 2A. Light incident to the first light guide member 2A from the LED 5 is refracted by the primary refractive surface 2b and the secondary refractive surface 2c to form light parallel to the optical axis of the LED 5. A reflection surface 3b is formed on a salient 3A provided projecting on a rear surface of a reflector 3, for reflecting parallel light emitted from the secondary refractive surface 2c of the first light guide member 2A in a direction orthogonal to the optical axis of the LED 5 and making the light incident into the second light guide member 2B.

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. And since the light from an LED has high directivity, the amount of light in the central part of the LED neighborhood is the largest, so there is a problem that unevenness occurs in the way the emblem shines.

  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, an invention according to claim 1 includes an emblem having a light-shielding portion and a light-transmitting portion, a light guide plate disposed on the back side of the emblem, and an LED disposed opposite to the light guide plate. In the emblem light emitting device for causing the light from the LED to pass through the light guide plate and the light transmitting portion of the emblem to emit light,
The light guide plate is composed of a first light guide member facing the LED and a second light guide member facing the emblem,
Convex primary refracting surfaces and secondary refracting surfaces are respectively formed on the incident portion and the emitting portion formed on the optical axis of the LED of the first light guide member, and the first light guide is formed from the LED. Refracting the light incident on the member on the primary refractive surface and the secondary refractive surface to make the light parallel to the optical axis of the LED,
On the back surface of the second light guide member or the emblem, parallel light emitted from the secondary refractive surface of the first light guide member is reflected in a direction perpendicular to the optical axis of the LED, and the second light guide. It is characterized in that a reflecting surface for entering the optical member is formed.

  According to a second aspect of the present invention, in the first aspect of the present invention, a concave portion is formed on the back surface of the first light guide member, and the LED is disposed in the concave portion.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the first refractive surface of the first light guide member is formed in an angle range within 40 ° from side to side about the optical axis of the LED. It is characterized by being.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a reflective material is interposed between the substrate on which the LED is mounted and the first light guide member, or the substrate. The top surface of the substrate is subjected to a reflection treatment.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the light guide plate is surrounded by a reflecting material.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein a reflective material or a diffusing material is interposed between the emblem and the second light guide member. .

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the first light guide member and the second light guide member are embossed at positions corresponding to the light transmitting portions of the emblem. It is characterized by processing.

  According to the first aspect of the present invention, the strong light emitted from the center of the LED and incident from the primary refractive surface of the first light guide member is refracted by the primary refractive surface and the secondary refractive surface to be parallel light. And the parallel light is reflected in a direction perpendicular to the optical axis of the LED by the reflecting surface formed on the back surface of the second light guide member or the emblem, and the second light guide. The light is incident on the member at a shallow angle and travels farther in the longitudinal direction in the second light guide member while uniforming the intensity while repeating irregular reflection. For this reason, the strong light emitted from the center of the LED, which has not been used efficiently until now, expands the light-emitting area and makes the intensity uniform, and also reduces color unevenness and is efficient for light emission of the emblem. It is often used, and it is possible to emit a uniform emblem without color unevenness.

  Moreover, since the board on which the LED is mounted can be increased in layout, the heat from the LED can be efficiently radiated from the board having a large area (heat radiation area), and the heat dissipation of the emblem light emitting device can be improved. Thus, the LED is efficiently cooled, and the temperature rise is suppressed.

  According to invention of Claim 2, since the recessed part was formed in the back surface of the 1st light guide member, and LED was arrange | positioned in this recessed part, the light radiate | emitted from the side of LED is a recessed part of the 1st light guide member. The emblem can downsize the high device in terms of layout.

  According to the invention described in claim 3, among the light emitted from the LED, the light having a strong angle range of 15 ° to the left and right centering on the optical axis of the LED is incident from the primary refractive surface of the first light guide member. The strong light is refracted by the primary refractive surface and the secondary refractive surface of the first light guide member to be parallel light parallel to the optical axis of the LED, and emits light with uniform intensity while suppressing color unevenness of the emblem. Provided.

  According to the fourth aspect of the present invention, the first light guide member is formed by the reflective material interposed between the substrate on which the LED is mounted and the first light guide member, or the reflection treatment applied to the upper surface of the substrate. The incident light is reflected and the intensity is made uniform in the longitudinal direction of the first light guide member.

  According to the fifth aspect of the present invention, since the periphery of the light guide plate is surrounded by the reflector, the light from the LED is prevented from being emitted from the periphery of the light guide plate, and the light from the LED is more efficiently used for emblem light emission. 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.

  According to the invention described in claim 6, since the light that has entered the second light guide member is reflected or diffused by the reflective material or the diffusing material interposed between the emblem and the second light guide member, The intensity of light emitted from the second light guide member and used for light emission of the emblem is made uniform, and light emission with uniform emblem and no color unevenness is possible.

  According to invention of Claim 7, the light reflected and diffused by the embossing process formed in the position corresponding to the translucent part of the emblem of the 1st light guide member and the 2nd light guide member is the translucency of an emblem. Since the light travels toward the part, the periphery of the emblem effectively emits light.

It is a front view of an emblem. It is sectional drawing of the emblem light-emitting device based on this invention. 1 is an exploded cross-sectional view of an emblem light emitting device according to the present invention. It is the A section enlarged detail drawing of FIG. It is sectional drawing which shows the optical path | route of the emblem light-emitting device based on this invention. It is the B section enlarged detail drawing of FIG. 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 translucent part 10b is constituted by a through hole, and light freely passes through the translucent part 10b, so that the periphery of the translucent part 10b emits light.

  Next, an emblem light emitting device that causes the emblem 10 to emit light in order to enhance the visibility of the emblem 10 at night will be described with reference to FIGS.

  2 is a sectional view of the emblem light emitting device according to the present invention, FIG. 3 is an exploded sectional view of the emblem light emitting device, FIG. 4 is an enlarged detail view of part A in FIG. FIG. 6 is an enlarged detailed view of part B in FIG. 5.

  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. The light guide plate 2 is composed of a first light guide member 2A for short-distance irradiation facing an LED 5 described later and a second light guide member 2B for long-distance irradiation facing an emblem 10. The first light guide member 2A and the second light guide member 2B constituting the light guide plate 2 are integrally formed by, for example, two-color molding. 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, and the periphery of the light guide plate 2 is surrounded by the reflective material 3. Note that a plurality of slits 3 a having the same shape as the light transmitting portion 10 b of the emblem 10 are formed in the reflecting material 3 as light emitting portions.

  In addition, an elliptical plate-like substrate 4 along the outer shape of the emblem 10 is disposed on the lower surface of the light guide plate 2 (first light guide member 2A). LED5 is mounted. In the present embodiment, the upper surface of the substrate 4 is subjected to a reflection process. Instead of the reflection process, a reflective material is interposed between the first light guide member 2A and the substrate 4. Also good.

  By the way, a recess 2a is formed in the center of the back surface of the first light guide member 2A, and the LED 5 is disposed in the recess 2a. Accordingly, the concave portion 2a of the first light guide member 2A constitutes an incident portion where light from the LED 5 enters, and a portion facing the concave portion 2a on the upper surface of the first light guide member 2A (on the optical axis of the LED 5). ) Constitutes an emission part. In this embodiment, as shown in detail in FIG. 4, the top surface of the concave portion 2a constituting the incident portion of the first light guide member 2A has a convex (hemispherical) primary refractive surface. 2b is formed, and a convex (hemispherical) secondary refracting surface 2c is also formed on the emission portion on the upper surface of the first light guide member 2A. In the present embodiment, the primary refracting surface 2b of the first light guide member 2A is formed in an angle range of 15 ° to the left and right with the optical axis of the LED 5 as the center. In addition, the first light guide member 2A and the second light guide member 2B are subjected to embossing at positions corresponding to the light transmitting portions 10b of the emblem 10 (positions indicated by a, b, c, and d in FIG. 2). It has been subjected.

  A through hole 2d is formed at the center of the second light guide member 2B (position facing the secondary refractive surface 2c of the first light guide member 2A). A triangular prism-shaped convex portion 3A that protrudes from the center of the lower surface of the reflective material 3 faces, and both surfaces of the convex portion 3A form a reflective surface 3b. In the present embodiment, the convex portion 3A having the reflective surface 3b is formed on the reflective material 3, but a convex portion having a similar reflective surface may be formed on the second light guide member 2B.

  Thus, in the emblem light emitting device 1 configured as described above, when the LED 5 is energized when the LED 5 emits light, among the light emitted from the LED 5, an angular range of 15 ° to the left and right around the optical axis of the LED 5. As shown in FIGS. 5 and 6, the strong light is incident on the first light guide member 2A from the primary refracting surface 2b formed in the incident portion of the first light guide member 2A, and is refracted. It goes to the emission part on the upper surface while spreading. And the strong light which goes to the emission part of the 1st light guide member 2A is refracted by passing through the secondary refracting surface 2c formed in the emission part of the 1st light guide member 2A, and the light of LED5 It becomes parallel light parallel to the axis and is emitted vertically upward in FIGS.

  Thus, the parallel light is reflected at substantially right angles by the left and right reflecting surfaces 3b of the convex portion 3A of the reflecting material 3 facing the through hole 2d of the second light guide member 2B, and the second light guide member 2B The light enters the second reflector 2B at a shallow angle from the peripheral surface (incident surface) of the through hole 2d at a shallow angle, and is guided far away while being irregularly reflected in the second light guide member 2B. For this reason, the strong light emitted from the center of the LED 5 that has not been efficiently used until now is enlarged in the light emitting area and uniform in intensity, and the color unevenness is reduced. Then, the light guided farther through the inside of the second light guide member 2B is emitted from the emission surface of the second light guide member 2B toward the emblem 10 in the process, and the slit 3a of the reflector 3 and the slit 3a. By passing through the translucent part 10b of the continuous emblem 10, the periphery of the translucent part 10b of the emblem 10 is caused to emit light.

  Of the light from the LED 5, the light deviating from the primary refracting surface 2 b of the first light guide member 2 </ b> A is incident on the peripheral surface of the concave portion 2 a of the first light guide member 2 </ b> A as the incident surface. The light enters the inside of the optical member 2A and progresses while the intensity is made uniform while irregularly reflecting the inside of the first light guide member 2A and the second light guide member 2B. In this case, in this embodiment, the first light guide member 2A and the second light guide member 2B are embossed at positions corresponding to the light transmitting portions 10b of the emblem 10 (positions indicated by a to d in FIG. 2). Since the processing is performed, the light is reflected and diffused by the texture processing, and the reflected and diffused light passes through the slit 3a of the reflector 3 and the light transmitting portion 10b of the emblem 10 as shown in FIG. The periphery of the translucent part 10b of the emblem 10 emits light effectively. In particular, in the present embodiment, light deviating from the first refractive surface 2B of the first light guide member 2A can efficiently illuminate the near field (the central portion in the vicinity of the LED 5) by being refracted at a deep angle. it can.

  By the way, in this Embodiment, since the reflecting material 3 was interposed between the board | substrate 4 which mounts LED5, and the 1st light guide member 2A, the light which injected into the 1st light guide member 2A is reflected. The material 3 is reflected in the first light guide member 2 </ b> A and the second light guide member 2 </ b> B, and the strength is made uniform in the longitudinal direction of the light guide plate 2. In the present embodiment, since the periphery of the light guide plate 2 is surrounded by the reflector 3, the light from the LED 5 is more efficiently emitted to the emblem 10 by preventing light from being emitted from the periphery of the light guide plate 2 to the outside. All of the light from the LED 5 can be diffusely reflected in the light guide plate 2 to be uniform, and the color unevenness can be reduced more effectively.

  Further, according to the emblem light emitting device 1 according to the present invention, the board 4 on which the LED 5 is mounted can be increased in terms of layout, so that the heat from the LED 5 can be efficiently radiated from the board 4 having a large area (heat radiation area). The heat dissipation of the emblem light emitting device 1 is enhanced, the LED 5 is efficiently cooled, and the temperature rise is suppressed. In particular, in the present embodiment, the concave portion 2a is formed on the back surface of the first light guide member 2A, and the LED 5 is disposed in the concave portion 2a. Therefore, the light emitted from the side of the LED 5 is emitted from the first light guide member 2A. The emblem light emitting device 1 can be downsized in terms of layout.

  In the above embodiment, the reflective material 3 is interposed between the emblem 10 and the light guide plate 2 (second light guide member 2B). However, instead of the reflective material 3, a diffusing material is interposed. May be.

  Further, in the above embodiment, the primary refractive surface 2b of the first light guide member 2A is formed in an angle range of 15 ° to the left and right with the optical axis of the LED 5 as the new position. Are scattered continuously from the distant to the vicinity of the optical axis of the light source, the primary refracting surface 2b of the first light guide member 2A has an angle of 40 ° on the left and right with the optical axis of the LED 5 as the center. You may form in a range. In this case, the density of the embossing applied to the second light guide member 2B corresponding to the translucent part of the emblem 10 close to the optical axis of the light source is high, and the translucent part of the emblem 10 is far from the optical axis of the light source. Irradiation is performed from a translucent part at a position far from the optical axis of the light source among the plurality of translucent parts of the emblem 10 by reducing the density of the texture processing applied to the corresponding second light guide member 2B. As the light intensity increases, the light emitted from the translucent part located near the optical axis of the light source gradually decreases, and color unevenness can be effectively reduced while emitting light like gradation. .

DESCRIPTION OF SYMBOLS 1 Emblem light-emitting device 2 Light guide plate 2A 1st light guide member of a light guide plate 2B 2nd light guide member of a light guide plate 2a Recessed part of a light guide plate 2b Primary refractive surface 2c of a 1st light guide member 2c 1st light guide Secondary refracting surface of member 2d Through-hole of second light guide member 3 Reflective material 3A Convex portion of reflective material 3a Slit of reflective material 3b Reflective surface of convex portion 4 Substrate 5 LED
DESCRIPTION OF SYMBOLS 10 Emblem 10a Shading part of emblem 10b Translucent part of emblem

Claims (7)

An emblem having a light-shielding portion and a light-transmitting portion; a light guide plate disposed on the back side of the emblem; and an LED disposed opposite to the light guide plate; and light from the LED passes through the light guide plate In an emblem light emitting device that passes through a light transmitting part and emits light from the light transmitting part,
The light guide plate is composed of a first light guide member facing the LED and a second light guide member facing the emblem,
Convex primary refracting surfaces and secondary refracting surfaces are respectively formed on the incident portion and the emitting portion formed on the optical axis of the LED of the first light guide member, and the first light guide is formed from the LED. Refracting the light incident on the member on the primary refractive surface and the secondary refractive surface to make the light parallel to the optical axis of the LED,
On the back surface of the second light guide member or the emblem, parallel light emitted from the secondary refractive surface of the first light guide member is reflected in a direction perpendicular to the optical axis of the LED, and the second light guide. An emblem light emitting device characterized in that a reflecting surface to be incident on an optical member is formed.   The emblem light emitting device according to claim 1, wherein a concave portion is formed on a back surface of the first light guide member, and the LED is disposed in the concave portion.   3. The emblem light emitting device according to claim 1, wherein the first refractive surface of the first light guide member is formed in an angle range within 40 ° from side to side about the optical axis of the LED. .   The reflective material is interposed between the board | substrate which mounts the said LED, and the said 1st light guide member, or the reflection process was performed to the upper surface of the said board | substrate, The any one of Claims 1-3 characterized by the above-mentioned. The emblem light emitting device described.   The emblem light-emitting device according to claim 1, wherein the light guide plate is surrounded by a reflective material.   The emblem light-emitting device according to claim 1, wherein a reflective material or a diffusing material is interposed between the emblem and the second light guide member. The emblem light emission according to any one of claims 1 to 6, wherein the first light guide member and the second light guide member are embossed at a position corresponding to a translucent portion of the emblem. apparatus.

Images