JP6319757B2 - Emblem light emitting device - Google Patents

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 that emits 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.

  24 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 103 disposed on the back side of the emblem 109 is shown. A flexible substrate 106 is arranged on the flexible substrate 106, and a plurality of LED chips 105 are provided on the flexible substrate 106 at appropriate intervals in the circumferential direction. A diffusion plate 104 is bonded to the back surface of the emblem 109, and a milky white coating film 115 is formed on the bottom surface of the casing 103.

  In such an emblem light emitting device 101, when each LED chip 105 is energized and the LED chip 105 emits light, the light is reflected by the coating film 115 formed on the bottom surface of the casing 103 and travels toward the diffusion plate 104. A part of the light is diffused by the diffusion plate 104 and passes through the cut-out portion 109 a of the emblem 109 so that the periphery of the emblem 109 emits light. According to the emblem light emitting device 101, light with strong directivity emitted from the LED chip 105 is reflected and diffused by the coating film 115, and the reflected light is further diffused by the diffusion plate 104, 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. 25 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.

  Further, Patent Document 3 proposes an emblem light emitting device as shown in FIG.

  26 is a longitudinal sectional view of the emblem light emitting device proposed in Patent Document 3. In the illustrated emblem light emitting device 301, a recess (space storage) formed in the logo shape portion of the emblem (design body) 309 is shown. Part) 309a accommodates the LED 305 and irradiates light from the back side of the emblem 309. According to this, the high brightness portion of the LED 305 is removed, and uniform light emission without color unevenness is possible. Become.

Utility Model Registration No. 3169564 Japanese Patent No. 4790095 JP2012-083520A

  However, since the emblem light emitting devices 101, 201, and 301 proposed in Patent Documents 1 to 3 use highly directional LEDs 105, 205, and 305 as light sources, areas close to these LEDs 105, 205, and 305 are used. The brightness of the light source inevitably increases, and uneven brightness occurs throughout, making it impossible to emit light uniformly. In particular, when the emblem light emitting device is reduced in thickness and size, the occurrence of luminance unevenness is remarkable.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an emblem light emitting device capable of uniform light emission while suppressing occurrence of luminance unevenness.

In order to achieve the above object, according to the first aspect of the present invention, an LED as a light source and light emitted from the LED are guided in a space defined by an outer lens having an emblem attached to the surface and a housing. In an emblem light emitting device comprising a light guide plate, a first reflective sheet, and a second reflective sheet ,
On the substrate on which the LED is mounted, a reflecting member is erected on both sides of the LED so as to sandwich the LED,
Forming a through hole through which the reflection member penetrates the first reflection sheet, the light guide plate, and the substrate;
Forming a hole for the LED to pass through the first reflective sheet, forming a hole for the LED to face the light guide plate;
The substrate is horizontally installed at the bottom of the housing, the first reflection sheet and the light guide plate are sequentially stacked on the substrate, and the second reflection sheet is placed on the inner surface of the outer lens above each LED. It is characterized by being partially arranged along.

  According to a second aspect of the present invention, in the first aspect of the invention, the reflecting member emits light emitted from the LED to an area of 50 ° to 90 ° on one side from the optical axis of the LED. It is characterized by reflecting toward the area.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the height of the reflecting member is changed.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a plurality of continuous V-shaped grooves are formed on the top surface of the reflecting member.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the reflecting member is made of a metal having high thermal conductivity.

  A sixth aspect of the invention is characterized in that, in the invention according to any one of the first to fourth aspects, the reflecting member is made of a light transmitting material and the thickness thereof is changed.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the first hole and the second hole are formed at two positions apart from the LED of the light guide plate. The second hole is provided with a reflecting function, and the light guided from the LED to the inside of the light guide is condensed by the first hole and then reflected by the second hole. Is made to function as a pseudo light source.

  According to the first and second aspects of the present invention, the reflecting members erected on both sides of the LED sandwich the LED, and the uneven weak light emitted from the LED (on one side from the optical axis of the LED is 50 ° to 90 °). Brightness unevenness at the periphery of the emblem is generated because the light in the area is reflected and diffused toward strong light without unevenness (light in the area of 0 ° to 50 ° on one side from the LED optical axis) and combined with the strong light. And uniform light emission can be realized.

  According to invention of Claim 3, the light quantity to the design surface of the outer lens to which the emblem was attached can be adjusted by changing the height of a reflection member.

  According to the fourth aspect of the present invention, since a plurality of continuous V-shaped grooves are formed on the top surface of the reflecting material, the brightness of the design surface of the outer lens to which the emblem is attached can be expressed with a gentle gradation. In addition, it is possible to prevent the occurrence of color unevenness by irregularly reflecting and diffracting light from the LED by the V-shaped groove of the reflecting member.

  According to the invention of claim 5, since the reflecting member is made of a metal having high thermal conductivity, the heat generated by the LED is efficiently conducted to the reflecting member and is radiated from the reflecting member. The rise is suppressed.

  According to invention of Claim 6, the brightness | luminance of the design surface of the outer lens to which the emblem was attached can be adjusted by comprising a reflecting material with a light transmissive material and changing the thickness. Further, by using a colorant that transmits light as the reflecting member, it is possible to express a gradation of color and to eliminate chromaticity unevenness, which is one of the characteristics of the LED.

  According to the seventh aspect of the present invention, it is possible to make it appear that the number of light sources is increased in a pseudo manner, and uniform light emission without unevenness can be realized.

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 of the emblem light-emitting device which concerns on Embodiment 1 of this invention. FIG. 3 is an enlarged detail view of a part A in FIG. 2. It is a top view which shows arrangement | positioning of LED and a reflection member of the emblem light-emitting device which concerns on Embodiment 1 of this invention. It is a light ray figure of the B section of FIG. It is a principle figure of the light distribution control of the emblem light-emitting device concerning Embodiment 1 of this invention. FIG. 7 is an enlarged detail view of a main part of FIG. 6. It is a top view which shows the example of arrangement | positioning of LED and a reflection member of the emblem light-emitting device which concerns on Embodiment 1 of this invention. It is a top view which shows the example of arrangement | positioning of LED and a reflection member of the emblem light-emitting device which concerns on Embodiment 1 of this invention. It is a top view which shows the example of arrangement | positioning of LED and a reflection member of the emblem light-emitting device which concerns on Embodiment 1 of this invention. It is a figure of the arrow D direction of FIG. 4 which shows another form of the reflection member of the emblem light-emitting device which concerns on Embodiment 1 of this invention. It is a figure of the arrow C direction of FIG. 4 which shows another form of the reflection member of the emblem light-emitting device which concerns on Embodiment 1 of this invention. It is a fragmentary sectional view which shows the modification of the emblem light-emitting device which concerns on Embodiment 1 of this invention. It is a top view of LED and a reflecting member which show the modification of the emblem light-emitting device concerning Embodiment 1 of this invention. It is sectional drawing of the emblem light-emitting device which concerns on Embodiment 2 of this invention. It is the D section enlarged detail drawing of FIG. It is an exploded sectional view of an emblem light emitting device concerning Embodiment 3 of the present invention. It is sectional drawing of the emblem light-emitting device which concerns on Embodiment 3 of this invention. It is the E section enlarged detail drawing of FIG. It is the same figure as FIG. 19 which shows the modification of the emblem light-emitting device which concerns on Embodiment 3 of this invention. It is sectional drawing of the emblem light-emitting device which concerns on Embodiment 4 of this invention. It is a figure of the arrow FF line direction of FIG. It is a figure similar to FIG. 22 which shows the modification of the emblem light-emitting device based on Embodiment 4 of this invention. It is sectional drawing of the light-emitting device proposed in patent document 1. FIG. It is sectional drawing of the light-emitting device proposed in patent document 2. FIG. It is sectional drawing of the light-emitting device proposed in patent document 3. FIG.

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

<Embodiment 1>
1 is an exploded sectional view of an emblem light emitting device according to Embodiment 1 of the present invention, FIG. 2 is a sectional view of the emblem light emitting device, FIG. 3 is an enlarged detail view of part A in FIG. FIG. 5 is a ray diagram of a portion B in FIG. 4, FIG. 6 is a principle diagram of light distribution control of the emblem light emitting device, and FIG. 7 is an enlarged detail view of a main part of FIG. It is.

  As shown in FIGS. 1 and 2, the emblem light emitting device 1 according to the present embodiment includes a reflection sheet 4, 5 and a light guide plate in a space defined by a housing 2 and an outer lens 3 that covers the opening. 6 and a substrate 8 on which an LED 7 as a light source is mounted, and an emblem 9 is attached to the surface of the outer lens 3. The emblem light emitting device 1 is for causing the emblem 9 to emit light in order to improve the visibility of the emblem 9 such as characters indicating a logo of a vehicle manufacturer or the like at night.

  The housing 2 is integrally formed of a light impermeable resin, and the outer lens 3 covering the opening is integrally formed of a transparent light transmissive resin or a light transmissive resin obtained by applying a color pigment. Yes. As shown in FIG. 2 and FIG. 3, vertical rib-like reflecting members 10 are integrally provided on both sides of the LED 7 at a place where the LED 7 is disposed on the bottom surface of the housing. Here, the reflection sheet 5, the light guide plate 6 and the substrate 8 are respectively formed with long through holes 5a, 6a, 8a through which the reflection member 10 standing on the housing 2 passes, A hole 5b for the LED 7 to pass through is formed in the reflection sheet 5 (see FIG. 1), and a rectangular hole 6b (see FIG. 4) for the LED 7 to face is formed in the light guide plate 6. In the present embodiment, the plurality of LEDs 7 are arranged as shown in FIG. 4 in plan view, and the reflecting members 10 are arranged on the left and right sides of each LED 7.

  Thus, as shown in FIGS. 2 and 3, in the space defined by the housing 2 and the outer lens 3, the substrate 8 is installed horizontally at the bottom of the housing 2, and the reflection sheet 5 and the light guide plate are placed thereon. 6 are sequentially laminated, and the reflection sheet 4 is partially disposed along the inner surface of the outer lens 3 above each LED 7.

  In the emblem light emitting device 1 configured as described above, when the LED 7 is activated and emits light, the light enters the light guide plate 6 while spreading radially around the LED 7 in plan view, as shown in FIG. The light guide plate 6 proceeds while being totally reflected, and is emitted from the surface of the light guide plate 6 through the outer lens 3 in the process, and is used for illumination of the emblem 9 attached to the surface of the outer lens 3. At this time, the direct light emitted upward from the LED 7 is reflected by the reflection sheet 4 and returned to the LED 7 side, and the light emitted from the lower surface of the light guide plate 6 is reflected by the reflection sheet 5 and enters the light guide plate 6. Is returned.

  Further, as shown in FIG. 5, a part of the light emitted from the LED 7 is repeatedly reflected by the reflecting member 10 facing each other with the LED 2 interposed therebetween, and then wraps around by the diffraction phenomenon at the end of the reflecting member 10 in a plan view. As a result, the luminance at the point P shown in the figure is reduced.

  By the way, in the side view, as shown in FIG. 6, among the light emitted from the LED 7, the light emitted from the optical axis of the LED 7 to the area A to B of 0 ° to 50 ° on one side is strong light without unevenness. The light irradiated from the optical axis to an area of 50 ° to 90 ° B to C on one side is weak light with unevenness.

  Thus, in the present embodiment, as shown in detail in FIG. 7, the reflecting member 10 erected on both sides of the LED 7 sandwiches the LED 7, and the uneven weak light emitted from the LED 7 (the LED 7). Light from an optical axis of one side of 50 ° to 90 ° on one side) is reflected and diffused toward uniform and strong light (light from 0 ° to 50 ° on one side from the optical axis of LED 7). Since they are combined, the occurrence of uneven brightness at the periphery of the emblem 9 is suppressed, and uniform light emission is realized.

  By the way, in this Embodiment, although LED7 and the reflection member 10 standingly arranged by the both right and left sides were arrange | positioned as shown in FIG. 4, arrangement | positioning of these LED7 and the reflection member 10 is arbitrary, for example, FIG. As shown in FIG. 8, a plurality of reflecting members 10 are linearly arranged on each of the left and right sides of the LED 7, or a plurality of reflecting members 10 are concentrically circular around the LED 7 as shown in FIG. You may arrange in.

  Moreover, you may use the thing as shown in FIG. 11 or FIG.

  That is, FIGS. 11 and 12 are views in the direction of arrow C in FIG. 4 showing another embodiment of the reflecting member. In the example shown in FIG. A plurality of V-shaped grooves 10a are continuously formed on the top surface of the. In the example shown in FIG. 12, the reflecting member 10 is formed in a fan shape, and a plurality of V-shaped grooves 10a are continuously formed on the top surface.

  Thus, by changing the height of the reflecting member 10, the amount of light on the design surface of the outer lens 3 to which the emblem 9 is attached can be adjusted. Further, if a plurality of continuous V-shaped grooves 10a are formed on the top surface of the reflecting member 10, the brightness of the design surface of the outer lens 3 to which the emblem 9 is attached can be expressed with a gentle gradation. Since the light from the LED 7 can be irregularly reflected and diffused and refracted by the V-shaped groove 10a of the reflecting member 10, the occurrence of color unevenness can be prevented.

  A modification of the present embodiment is shown in FIGS.

  FIG. 13 is a partial cross-sectional view showing a modification of the emblem light emitting device according to Embodiment 1 of the present invention, and FIG. 14 is a plan view of the LED and the reflecting member of the emblem light emitting device.

  In this modification, the reflecting member 10 is made of a light transmitting material, and its thickness is made narrower toward the end in the longitudinal direction as shown in FIG. By comprising in this way, the brightness | luminance of the design surface of the outer lens 3 to which the emblem 9 was attached can be adjusted. Further, by using a colorant that transmits light as the reflecting member 10, it is possible to express a color gradation and to eliminate chromaticity unevenness, which is one of the characteristics of the LED 7.

<Embodiment 2>
Next, a second embodiment of the present invention will be described below with reference to FIGS.

  15 is a cross-sectional view of the emblem light emitting device according to the second embodiment of the present invention, and FIG. 16 is an enlarged detail view of a portion D in FIG. 15. In these drawings, the same elements as those shown in FIGS. Are denoted by the same reference numerals, and repetitive description thereof will be omitted.

  The present embodiment is characterized in that a reflective sheet 11 is arranged along the inner side of the reflecting member 10 inside the reflecting member 10 erected integrally with the housing 2, and the other configuration is the first embodiment. Is the same as that.

  Thus, in the present embodiment, a part of the light from the LED 7 is efficiently reflected by the reflection sheet 11, and uneven and weak light (light in an area of 50 ° to 90 ° on one side from the optical axis of the LED 7). Since it is combined with strong light without unevenness (light in the area of 0 ° to 50 ° on one side from the optical axis of the LED 7), the occurrence of uneven brightness on the periphery of the emblem 9 is effectively suppressed, and more uniform light emission is realized. The

<Embodiment 3>
Next, a third embodiment of the present invention will be described below with reference to FIGS.

  17 is an exploded cross-sectional view of the emblem light emitting device according to Embodiment 3 of the present invention, FIG. 18 is a cross-sectional view of the emblem light emitting device, and FIG. 19 is an enlarged detail view of part E in FIG. The same elements as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted below.

  The present embodiment is characterized in that the reflecting member 12 formed in an L shape with a metal having high thermal conductivity is arranged on both sides of the LED 7, and the other configuration is the same as that of the first embodiment. It is the same.

  Thus, in this embodiment, the same effect as in the first embodiment can be obtained. However, in this embodiment, since the reflecting member 12 is made of a metal having high thermal conductivity, the heat generated by the LED 7 is reduced. Conducted efficiently to the reflecting member 12 and radiated from the reflecting member 12. As a result, the temperature rise of the LED 7 can be suppressed, and the light emission efficiency and durability life of the LED 7 can be improved.

  In this embodiment, the reflecting member 12 is formed in an L shape with a metal having high thermal conductivity. However, as shown in FIG. 20, it is formed in a U shape with a metal having high thermal conductivity. The same effect can be obtained even if the reflecting member 13 is used.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  21 is a cross-sectional view of the emblem light emitting device according to the fourth embodiment of the present invention, and FIG. 22 is a cross-sectional view taken along the line FF of FIG. 21, which is the same as that shown in FIGS. Elements are denoted by the same reference numerals, and description thereof will be omitted below.

  In the present embodiment, the first hole 6c and the second hole 6d are formed at two positions away from the LED 7 of the light guide plate 6, and the second hole 6d is provided with a reflection function so that light emitted from the LED 2 is emitted. Among them, the light incident on the inside of the light guide plate 6 from the periphery of the rectangular hole 6b is condensed in the first hole 6c as shown in FIG. 22 and then reflected in the second hole 6d to reflect the second light. It is characterized by functioning the hole 6d as a pseudo light source. Here, the inner peripheral surface of the second hole 6d is subjected to reflection processing, embossing, diffusion coating, and the like. Further, as shown in FIG. 22, reflection members 14 having a V shape in plan view are arranged on both sides of the LED 7.

  Thus, in the present embodiment, since the second hole 6d formed in the light guide plate 6 functions as a pseudo light source, it is possible to make it appear that the number of light sources has increased in a pseudo manner, and there is no unevenness. The effect that light emission can be realized is obtained.

  In the present embodiment, the inner peripheral surface of the second hole 6d of the light guide plate 6 that functions as a pseudo light source is subjected to processing such as reflection processing, embossing, and diffusion coating, but as shown in FIG. The same effect can be obtained even when the V-shaped reflection member 15 in a plan view is disposed in the second hole 6d formed in the light guide plate 6.

DESCRIPTION OF SYMBOLS 1 Emblem light-emitting device 2 Housing 3 Outer lens 4,5 Reflective sheet 5a Reflective sheet through hole 5b Reflective sheet hole 6 Light guide plate 6a Light guide plate through hole 6b Light guide plate rectangular hole 6c Light guide plate first hole 6d Light guide plate 2nd hole of 7 LED
8 Substrate 8a Substrate through-hole 9 Emblem 10 Reflective member 11 Reflective sheet 12-15 Reflective member

Claims (7)

An LED that is a light source, a light guide plate that guides light emitted from the LED, a first reflection sheet, and a second reflection in a space defined by an outer lens having an emblem attached to the surface and a housing In an emblem light emitting device that accommodates a sheet ,
On the substrate on which the LED is mounted, a reflecting member is erected on both sides of the LED so as to sandwich the LED,
Forming a through hole through which the reflection member penetrates the first reflection sheet, the light guide plate, and the substrate;
Forming a hole for the LED to pass through the first reflective sheet, forming a hole for the LED to face the light guide plate;
The substrate is horizontally installed at the bottom of the housing, the first reflection sheet and the light guide plate are sequentially stacked on the substrate, and the second reflection sheet is placed on the inner surface of the outer lens above each LED. An emblem light emitting device characterized by being partially arranged along.
  The said reflecting member reflects the light irradiated to the area of 50 to 90 degrees on one side from the optical axis of the LED toward the area of 0 to 50 degrees on one side. Emblem light emitting device.   The emblem light emitting device according to claim 1, wherein a height of the reflecting member is changed.   The emblem light emitting device according to any one of claims 1 to 3, wherein a plurality of V-shaped grooves are formed continuously on a top surface of the reflecting member.   The emblem light emitting device according to any one of claims 1 to 4, wherein the reflecting member is made of a metal having high thermal conductivity.   The emblem light emitting device according to any one of claims 1 to 4, wherein the reflecting member is made of a light transmitting material and the thickness thereof is changed. A first hole and a second hole are formed at two positions apart from the LED of the light guide plate, and the second hole is provided with a reflection function, and the inside of the light guide is guided from the LED. The light according to any one of claims 1 to 6, wherein the second hole is caused to function as a pseudo light source by being condensed at the first hole and then reflected at the second hole. Emblem light emitting device.

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