JP2016024960A - Lighting device and vehicle mounting the lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a planar lighting device which has a high degree of freedom for arrangement, visibility and designability, in a vehicle daytime travelling light.SOLUTION: A lighting device includes: a light source; a first light guide plate for making one division light, which is one part of the light emitted from the light source, incident from an incident part, and for emitting the light to the outside of a vehicle body; and a second light guide plate for making the other division light, which is another part different from the one division light, out of the light emitted from the light source LED, incident from the incident part, and for emitting the light to the outside of the vehicle body. A lighting unit is configured by combining incident part of the first light guide plate and the incident part of the second light guide plate, and by arranging the light source at the combined portion. Then, a planar lighting device is achieved which has a high degree of freedom for arrangement, visibility and designability, by connecting and arranging the plurality of lighting units.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device that is a vehicular lamp using a light emitting diode (LED) or the like as a light source, and more particularly to a vehicular lamp (so-called daylight) that allows a driver or a pedestrian of another vehicle to visually recognize the presence of the host vehicle in the daytime. Time running light (DRL), daylight). Moreover, it is related with the vehicle carrying this illuminating device.

  The DRL is currently established in Europe and the like, and the United States and the like are also compliant with the standard. As for the spread of light, a light source having a wide spread in the left-right direction with respect to the up-down direction is required.

  As a conventional daytime running light (DRL), the light emitted from the light source is emitted directly to the front using a lens or a reflecting mirror. For example, the high beam of the headlight is dimmed and the light distribution is used for daytime running. In some cases, the light emission amount and the light emission number of the LED array are changed so as to satisfy (for example, see Patent Document 1). FIG. 12 is a diagram showing a conventional daytime running light described in Patent Document 1. In FIG.

  In FIG. 12, 11 is an LED array, 12 is a lens, and light emitted from the LED array 11 is collimated by the lens 12. The light from the LED close to the optical axis of the lens 12 becomes light in the optical axis direction, that is, the front direction, and the light from the light emitting diode away from the optical axis of the lens 12 becomes light in the left-right direction and is emitted from the lens 12. The By adjusting the light quantity of each light emitting diode of the LED array 11, it is set as the light distribution of the daytime running light of a vehicle (automobile).

In addition, there is one that uses a light guide rod to form a linear light source. (For example, refer to Patent Document 2). FIG. 13 is a diagram showing a conventional daytime running light described in Patent Document 2. As shown in FIG.
In FIG. 13, 13 is a high-power LED, 14 is a light guide rod (light guide plate), and 15 is a prism formed on the light guide rod. Light emitted from the LED 13 is incident on the light guide rod 14 and propagates while totally reflecting inside the light guide rod 14. When the light 16 propagating in the light guide rod 14 enters the prism 15, a part of the light is bent by the prism, and is deviated from the total reflection condition of propagation of the light guide rod 14. It is injected.

JP 2010-067417 A JP 2012-169170 A

  However, it is difficult to freely change the external shape of the illumination device in a daytime running light illumination device that directly emits light from a light source to the front using a conventional lens. For example, it is difficult to arrange in a line obliquely in front of the vehicle body so that it can be easily seen by other drivers and pedestrians, and there is a problem that the degree of freedom in arrangement is small.

  Moreover, in the daytime running lighting device using the light guide rod, it is easy to form a line-shaped light source excellent in visibility and design, but it is difficult to emit light in a planar shape.

  The present invention solves the above-mentioned conventional problems, and has a high degree of freedom in arrangement, and an illumination device for daytime running light that emits light in a surface shape excellent in visibility and design, and an automobile equipped with this illumination device ( Vehicle).

  In order to achieve the above object, in a lighting device arranged in a vehicle body, a light source and a part of the light emitted from the light source are incident from a light incident part and light is emitted outside the vehicle body. 1st light guide plate and light emitted from the light source LED is a part different from one of the divided lights, and the other divided light is incident from the light incident part and is emitted to the outside of the vehicle body. A light guide plate, a light incident portion of the first light guide plate and a light incident portion of the second light guide plate are coupled, a light source is disposed in the coupled portion to constitute an illumination unit, and a plurality of the light guide plates The lighting units are connected and arranged.

According to the lighting device of the present invention,
The light emitted from the prism of the light guide plate gives the appearance of a uniform light emitting surface required for the daytime running light, and the light intensity required for the daytime running light is obtained by the strong light emitted from the end face of the light guide plate.

Schematic diagram of the lighting unit according to Embodiment 1 of the present invention. Sectional drawing of the prism of the 1st light-guide plate in Embodiment 1 of this invention. Sectional drawing of the prism of the 2nd light guide plate in Embodiment 1 of this invention Sectional drawing when the lighting units in Embodiment 1 of the present invention are connected Arrangement of lighting device on vehicle body in Embodiment 1 of the present invention The figure which shows the arrangement | sequence of the illumination unit in Embodiment 1 of this invention. The figure which shows the light ray for demonstrating Embodiment 1 of this invention The figure which shows the light ray simulation of Embodiment 1 of this invention Schematic diagram of a lighting apparatus according to Embodiment 2 of the present invention. Schematic diagram of the lighting unit in Embodiment 2 of the present invention The figure which shows the light ray of the illumination unit in Embodiment 2 of this invention. The figure which shows the conventional daytime running light described in patent document 1 The figure which shows the conventional daytime running light described in patent document 2

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

(Embodiment 1)
FIG. 5 is a diagram illustrating the position of the illumination device 130 according to the first embodiment in an automobile.

  FIG. 5 is a top view of the front end portion of the automobile 150. The illuminating device 130 is arrange | positioned at the right and left of the front of the vehicle body of the vehicle in the straight ahead direction. That is, it is arranged at an oblique portion of a corner (corner) at the front portion in the straight direction of the automobile. The lighting device needs to emit homogeneous light when viewed from the front, and in order to improve visibility to people and oncoming vehicles, the spread of light needs to be wider in the horizontal direction than in the vertical direction. The coordinate axes are the vehicle body front direction (straight direction of the vehicle), that is, the front direction is the Z axis, the upper direction is the Y axis, and the right direction on the paper is the X axis.

FIG. 1 is a cross-sectional view of a schematic diagram of the left side illumination device according to Embodiment 1 of the present invention.
The coordinate axes are the vehicle body front direction (straight direction of the automobile), that is, the front direction is the Z axis, the upward direction is the Y axis, and the right direction on the paper is the X axis.
Reference numeral 100 denotes an LED as a point light source, which emits white diffused light.
Reference numeral 101 denotes an LED substrate, which is a glass epoxy substrate on which LEDs are arranged and mounted at equal intervals, and electrical wiring is provided between the LEDs.
Reference numeral 102 denotes a first light guide plate made of a transparent resin such as acrylic or polycarbonate, and a first prism 104 is formed on the surface of the first light guide plate 102 on the LED substrate 101 side. A plurality of microprisms are arranged on the −Z side surface of the first prism 104. Further, the surface on the + Z side (the surface opposite to the prism forming surface) of the portion where the first prism 104 is formed is a flat surface. In the first light guide plate 102, the portion where the first prism 104 is formed is a flat plate shape, but the vicinity of the LED 100 has an arc in the XZ cross section, and the first light incident is made to propagate the light by total reflection. The light incident from the unit 103 is guided without loss.
Reference numeral 103 denotes a first light incident portion formed on the end surface of the first light guide plate 102, which has an aspheric lens shape, condenses light from the LED 100, and guides it to the first light guide plate 102.
Reference numeral 104 denotes a first prism formed on the first light guide plate 102. The slope inclination angle of the prism is adjusted so that the light emitted from the first light guide plate 102 by the first prism 104 is in the forward direction of the vehicle body (straight direction of the automobile).
Reference numeral 105 denotes a second light guide plate, which is a flat plate made of a transparent resin such as acrylic or polycarbonate. A second prism 107 is formed on the surface of the second light guide plate 105 on the LED substrate 101 side. A plurality of minute prisms are arranged on the surface of the second prism 107 on the + X side. In addition, the surface on the −X side (the surface opposite to the prism formation surface) of the portion where the second prism 107 is formed is a flat surface. An end surface of the second light guide plate facing the second light incident portion 106 is an emission surface, and emits light in the front direction of the vehicle body (straight direction of the automobile), that is, in the Z-axis direction.
A light incident portion 106 formed on the end surface of the second light guide plate has an aspherical lens shape, condenses light from the LED 100 and guides it to the second light guide plate 105.
Reference numeral 107 denotes a second prism formed on the second light guide plate 105. The light inclined from the second light guide plate 105 by the second prism 107 is adjusted in the slope inclination angle of the prism so that the center of the light comes obliquely left forward of the vehicle body with respect to the straight traveling direction of the automobile.
Reference numeral 108 denotes a reflection plate, which is disposed close to the lower surface of the first light guide plate 102 and the second light guide plate 105 along the first prism 104 and the second prism 107. In order not to disturb the total reflection of light at the first light guide plate 102 and the second light guide plate 105, the reflection plate 108 and the first light guide plate 102 and the second light guide plate 105 are arranged so as not to be in close contact with each other. The reflection plate 108 reflects the light leaked to the LED substrate 101 side of the first light guide plate 102 and the second light guide plate 105 and emits the light forward. The material is a resin material having heat resistance and ultraviolet resistance, such as white polybutylene terephthalate or polycarbonate containing fine bubbles.
Reference numeral 109 denotes an aspherical concave lens formed on the opposite end face of the second light entrance portion 106 of the second light guide plate 105, which diffuses the light propagating through the second light guide plate 105 and forwards the vehicle (straight forward of the vehicle). Direction).
Reference numeral 110 denotes an illumination unit including the first light guide plate 102, the second light guide plate 105, and the LED 100. The lighting device is configured by connecting lighting units 110.

  The first light guide plate 102 and the second light guide plate 105 are coupled by the first light incident portion 103 and the second light incident portion 106, have a V-shape, and the first light guide plates of the adjacent illumination units 110 of each other. The distal end of the second light incident portion 103 opposite to the first light incident portion 103 and the second light guide plate 105 opposite to the second light incident portion 106 are also joined together, and the light guide plate has an integral structure as a whole. In addition, an LED 100 is disposed in a lower part of the coupling between the first light guide plate 102 and the second light guide plate 105, and light emitted from the LED 100 is transmitted to the first light incident portion 103 of the first light guide plate 102 and the second light input portion 103. The light is divided and incident on the second light incident portion 106 of the light guide plate 105.

  When the vehicle body is viewed from the front (from the straight direction of the automobile), that is, from the negative Z-axis direction, at least the projected area on the YX plane of the first light guide plate 102 is larger than the projected area of the second light guide plate 105. Be placed.

  FIG. 2 is a cross-sectional view of the first prism 104 formed on the first light guide plate, and FIG. 3 is a cross-sectional view of the second prism 107 formed on the second light guide plate.

  2 and 3, elements having the same numbers as those in FIG. 1 are the same and will not be described.

  The first prism 104 and the second prism 107 are concave prisms having a triangular cross section, and are formed on the surface of the first light guide plate 102 and the second light guide plate 105 on the LED substrate 101 side. The inclination angle between the prism forming surface of the first light guide plate 102 and the prism forming portion side of the prism bottom surface of the first light guide plate 102 is about 55 degrees on the light incident side θ1 and about 49 degrees on the opposite side θ2, The inclination angle between the prism formation surface of the second light guide plate 105 and the prism formation portion on the prism bottom surface of the second light guide plate 105 is about 28 degrees on the light incident side θ3 and about 76 degrees on the opposite side θ4. The prism angles θ <b> 1 and θ <b> 2 of the first light guide plate 102 are set in order to adjust the direction of light emitted from the first prism 104 of the first light guide plate 102. The prism angles θ3 and θ4 of the second prism 107 of the second light guide plate 105 adjust the direction of the light emitted from the second prism 107 of the second light guide plate 105, and the first light guide plate 102 and the second light guide plate 105. It is set in consideration of the draft when making by molding. The prisms are formed on the entire surface of the first light guide plate 102 and the second light guide plate 105 at a constant pitch. As for the prism depth, the prism depth closer to the LED 100 is shallow so that the light emission luminance of the light guide plate is uniform, and the prism depth is made deeper as the distance from the LED 100 increases.

FIG. 4 shows a lighting device 130 to which the lighting unit 110 is connected.
4, elements with the same numbers as those in FIG. 1 are the same and will not be described.
Each of the illumination units 110 is formed by integrating adjacent first light guide plates and second light guide plates at end surfaces. Each illumination unit 110 can easily adjust the distribution of emitted light by individually setting the V-shaped angles and directions of the first light guide plate and the second light guide plate. Reference numeral 111 denotes a transparent cover for preventing dirt, which is an acrylic or polycarbonate plate. 101 is an LED substrate.

  FIG. 6 is a view of the lighting device 130 as viewed from the front of the vehicle body, and shows an example of the arrangement of the lighting units 110.

FIG. 6A shows the lighting units 110 arranged vertically when viewed from the front of the car body.
FIG. 6B shows the lighting units 110 arranged in an oblique direction when viewed from the front of the car body.
FIG. 6C shows the lighting units 110 arranged in the left-right direction when viewed from the front of the car body.
The operation of the daytime running light configured as described above will be described.
FIG. 7 is a diagram illustrating light rays inside the illumination unit. In FIG. 7, elements with the same numbers as in FIG.
The light emitted from the LED 100 is transmitted through the first light guide plate 102 and the second light guide plate 105 by the light 120 incident on the first light incident portion 103 and the light 123 incident on the second light incident portion 106, respectively.

  Light 120 entering the first light guide plate 102 propagates through the first light guide plate 102 while repeating total reflection on the surface of the first light guide plate 102 as indicated by light 121. When the light enters the first prism 104, the angle at which most of the light propagates due to total reflection on the slope of the prism changes greatly, and is emitted in the forward direction of the vehicle body (the straight direction of the vehicle) as indicated by the light 122.

  Similarly, the light 123 propagating through the second light guide plate 105 is also reflected in the second light guide plate 105 while repeating total reflection on the surface of the second light guide plate 105 as indicated by the light 124. Propagate through 105. When light enters the second prism 107, the angle at which most of the light propagates due to total reflection at the slope of the prism changes significantly, and as shown by the light 125, the vehicle body front left direction (front left with respect to the vehicle straight direction). Direction). The light that cannot be extracted by the second prism 107 of the second light guide plate 105 is emitted in the forward direction of the vehicle body as indicated by the light 126 from the aspheric concave lens 109 formed on the end surface of the second light guide plate 105.

  When the light 122 from the first light guide plate 102 and the light 123 and light 126 from the second light guide plate 105 are combined, light with a uniform distribution on the left and right is obtained.

  A first prism 104 and a second prism 107 are formed on the entire surface of the first light guide plate 102 and the second light guide plate 105, and the prism depth closer to the LED 100 side is shallower, and the prism depth increases as the distance from the LED 100 increases. Thus, the light is uniformly emitted from the entire surface of the first light guide plate 102 and the second light guide plate 105. Further, when the vehicle body is viewed from the front (straight direction of the automobile), the area of the first light guide plate 102 is larger than the area of the second light guide plate, so that the entire lighting device shines uniformly. appear.

FIG. 8 shows a simulation example in the lighting apparatus according to the present embodiment.
The total luminous flux of the LED 100 is assumed to be 1990 lm (lumen), and the luminosity is simulated for the lighting device on the left side (left side in FIG. 5) of the lighting device 130 with respect to the straight traveling direction of the automobile.
FIG. 8A shows the angular luminous intensity distribution in the horizontal plane of the light emitted from the illumination device 130, that is, the XZ plane. The angle is positive at the front of the vehicle body, that is, the angle from the positive Z-axis direction to the positive X-axis direction.
FIG. 8B shows the angular luminous intensity distribution in the vertical plane of the light emitted from the illumination device 130, that is, the YZ plane. The angle is positive at the front of the vehicle body, that is, the angle from the positive Z-axis direction to the positive Y-axis direction.
FIG. 8 (c) shows the measurement angle and required light intensity in accordance with European law ECE R87, and also shows the simulation results. It can be confirmed that the light intensity required by the law is satisfied.

(Embodiment 2)
FIG. 9 shows the arrangement of the illumination units of the illumination apparatus according to Embodiment 2 of the present invention.
FIG. 9A is an arrangement when the illumination device is viewed from the front direction of the vehicle body (the straight traveling direction of the automobile), and FIG. 9B is a perspective view of the illumination device.

  9, elements having the same numbers as those in FIG. 1 are the same and will not be described.

In FIG. 9, reference numeral 140 denotes an illumination unit that performs planar illumination in the same manner as the illumination unit 110. The illumination unit 110 and the illumination unit 140 are arranged and connected in a U-shape. The illumination unit 140 is arranged in front of the vehicle body (straight forward direction of the vehicle) and connected in the vertical direction, and the illumination unit 110 is arranged obliquely with respect to the vehicle body when projected on the XZ plane.
FIG. 10 shows the details of the structure of the illumination unit 140 in the YZ section.

  10, elements having the same numbers as those in FIG. 1 are the same and will not be described.

  Reference numeral 143 denotes a third light guide plate, and reference numeral 144 denotes a light incident portion formed on the end face of the third light guide plate, which has an aspheric lens shape. The third light guide plate 143 is a flat plate made of a transparent resin such as acrylic or polycarbonate. Reference numeral 144 denotes a light incident portion formed on the end surface of the third light guide plate 143, which has an aspheric lens shape, condenses light from the LED 100, and guides it to the third light guide plate 143.

  Reference numeral 140 denotes an illumination unit including the first light guide plate 102, the third light guide plate 143, and the LED 100. The lighting device is configured by connecting a lighting unit 110 and a lighting unit 140.

  The first light guide plate 102 and the third light guide plate 143 are coupled by the first light incident portion 103 and the light incident portion 144, have a V-shape, and the first light guide plate 102 and the third light guide unit 102 adjacent to each other are adjacent to each other. The front end of the light guide plate 143 is also coupled, and the light guide plate has an integral structure as a whole.

When the illuminating device is viewed from the front (the straight direction of the automobile) of the vehicle body, that is, from the negative Z-axis direction, at least the projected area on the XY plane of the first light guide plate 102 is larger than the projected area of the third light guide plate 143. It is arranged to become.
The operation of the daytime running light configured as described above will be described.

  The light beam state in the illumination unit 110 (FIG. 9) is the same as that in FIG.

  FIG. 11 shows a light beam state in the illumination unit 140. In FIG. 11, the elements with the same numbers as those in FIGS.

  The light 145 incident on the light incident portion 144 of the third light guide plate 143 from the LED 100 propagates while totally reflecting the inside of the third light guide plate 143, and is an aspheric concave lens formed at the end of the third light guide plate 143. The light 146 is emitted from 109 in the forward direction of the vehicle body.

  Similarly, the light 120 incident on the first light guide plate 102 from the LED 100 propagates through the first light guide plate 102 while being totally reflected, and the first prism 104 moves from the first light guide plate 102 to the vehicle body forward direction (straight direction of the vehicle). ) Is emitted.

  Similarly to the first embodiment, the illumination unit 110 also emits light in the forward direction of the vehicle body (see FIG. 7), and the emitted light of the illumination unit 110 and the illumination unit 140 is summed to become the emitted light of the illumination device.

  When the light 122 from the first light guide plate 102, the light 125 (FIG. 7) and the light 126 (FIG. 7) from the second light guide plate 105 (FIG. 7), and the light 146 from the third light guide plate 143 are combined, Evenly distributed light is obtained.

  As shown in FIG. 1, in the illumination unit 110, the first light guide plate 102 and the second light guide plate 105 have the first prism 104 and the second prism 107 formed on the entire surface, and the prism depth closer to the LED 100 is shallower. Since the prism depth is increased as the distance from the LED 100 increases, light is uniformly emitted from the entire surface of the first light guide plate 102 and the second light guide plate 105. Further, when the vehicle body is viewed from the front (straight direction of the automobile), the area of the first light guide plate 102 is arranged larger than the area of the second light guide plate, so that the entire illumination unit 110 seems to shine uniformly. Looks like.

  Similarly, as shown in FIG. 11, in the illumination unit 140, the first light guide plate 102 has the first prism 104 formed on the entire surface, and the prism depth closer to the LED 100 is shallower, and the prism depth increases as the distance from the LED 100 increases. Since it is formed to be deep, light is emitted uniformly from the entire surface of the first light guide plate 102. Further, when the vehicle body is viewed from the front, since the area of the first light guide plate 102 is larger than the area of the third light guide plate, the entire illumination unit 140 appears to shine uniformly.

  According to such a configuration, the light emitted from the prism of the light guide plate looks good on the uniform light emitting surface required for the daytime running light, and the light intensity required for the daytime running light by the strong light emitted from the end surface of the light guide plate. can get.

  The LED substrate 101 is a glass epoxy substrate, but a flexible substrate may be used.

  In addition, although the 1st light guide plate 102 and the 2nd light guide plate 105 were made into the flat plate, the LED100 side may be thick and the wedge shape which becomes thin as it distances from LED100 may be sufficient.

  The first light guide plate and the second light guide plate may be integrally formed by molding, or may be individually formed and combined by bonding.

  In addition, although the prism formed in the 1st light guide plate and the 2nd light guide plate was made into the triangle, you may attach a little flat part to the vertex part of a triangle by the restrictions of a process.

Although the LEDs are arranged uniformly, it is necessary to balance the amount of light, but they may be arranged non-uniformly. The reflector 108 may be a mirror reflecting surface such as an aluminum vapor deposition surface or an aluminum plating surface. Further, an aluminum plate may be used if there is no weight restriction.

  The first prism 104 and the second prism 107 of the first light guide plate 102 and the second light guide plate 105 have a constant pitch and a variable prism depth, but the prism depth is fixed and the pitch is changed. It may be variable. Alternatively, both the pitch and the prism depth may be variable.

  The daytime running light for a vehicle according to the present invention is a linear light source having high light efficiency and a certain degree of directivity using LEDs, and is suitable for lighting applications such as spot lighting that selects and illuminates only a specific object. Is also applicable. In addition to being applicable as a lighting device for automobiles, the present invention can also be applied to traveling vehicles such as bicycles, motorcycles, and wheelchairs.

100 LED
DESCRIPTION OF SYMBOLS 101 LED board 102 1st light-guide plate 103 1st light-incidence part 104 1st prism 105 2nd light-guide plate 106 2nd light-incidence part 107 2nd prism 108 Reflector 109 Aspherical concave lens 110 Illumination unit 130 Illumination device 150 Automobile

Claims (7)

In the lighting device arranged on the vehicle body,
A light source;
A first light guide plate for entering a part of the light emitted from the light source from a light incident portion and emitting the light out of the vehicle body;
A second light guide plate that enters a part of the split light different from the split light from the light source LED from a light incident portion and emits the light out of the vehicle body;
Have
Combining the light incident part of the first light guide plate and the light incident part of the second light guide plate, disposing the light source in the joined part, and constituting an illumination unit,
A lighting device comprising a plurality of the lighting units connected to each other.   The prism according to claim 1, wherein a prism is formed on the first light guide plate, light is emitted from the prism of the first light guide plate to the outside of the vehicle body, and the first light guide plate emits light in a planar shape. Lighting device.   The lens is formed in the edge part opposite to the incident part of the said 2nd light-guide plate, and light is inject | emitted from the lens of the said 2nd light-guide plate out of a vehicle body. Item 3. The lighting device according to any one of Items 2 to 3.   The illumination according to any one of claims 1 to 3, wherein an area of the first light guide plate is larger than an area of the second light guide plate when the illumination device is viewed from a straight direction of the vehicle body. apparatus.   The light incident on the first light guide plate from the light source propagates through the first light guide plate and is emitted from the prism of the first light guide plate to the outside of the vehicle body. The lighting device according to claim 4.   The lighting device according to claim 1, wherein the light incident portion has a curved shape.   A vehicle equipped with the lighting device according to claim 1.

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