JP2010153269A - Lamp tool for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp tool for vehicle superbly illuminating a narrow high-intensity area as well as a surrounding low-intensity area with a simple structure, in one irradiating high beams. <P>SOLUTION: The lamp tool for a vehicle for irradiating front of the vehicle is provided with a first light-emitting unit including a first light source portion having a plurality of first LED chips arrayed in a width direction of the vehicle and a first reflector fitted at a light-releasing side of the plurality of first LED chips for reflecting released light of the plurality of first LED chips toward front of the vehicle, and a second light-emitting unit including a second light source portion having a plurality of second LED chips arrayed in a back-and-forth direction of the vehicle and a second reflector fitted at a light-releasing side of the plurality of second LED chips for reflecting released light of the plurality of second LED chips toward front of the vehicle, with an angle of beam spread of light emitted from the second light-emitting unit larger than that emitted from the first light-emitting unit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of a vehicular lamp.

  Some vehicle lamps such as headlamps emit light that illuminates a wide area with low light intensity (low beam) and light that illuminates a narrow area with high light intensity (high beam). For example, Patent Document 1 discloses a configuration in which two types of light source units having different luminances of irradiation light are used. Patent Document 2 discloses a configuration including two types of light source units having different light distribution characteristics, that is, a light source unit specialized for illuminating the immediately preceding region of the vehicle and a light source unit widely illuminating the front of the vehicle. Patent documents 1 and 2 are the composition of the lamp which mainly irradiates a low beam. Patent Document 3 discloses a configuration in which a plurality of light source units having different light distribution characteristics are used in combination to illuminate a low beam and a high beam. Patent Document 4 discloses a configuration in which a light source unit including a plurality of individually controllable LED chips is used to illuminate a low beam and a high beam with a single light source unit.

JP 2005-294166 A JP 2007-134052 A Japanese Patent No. 4080780 JP 2007-323885 A

A high beam illuminates a region sandwiched with high light intensity, but it is also necessary to illuminate a peripheral region of the narrow region with low light intensity. In the configuration of Patent Document 3, the light distribution characteristics are adjusted by the reflector shape of the light source unit, and the lighting mode is set by adjusting the arrangement of the light source unit, so that both the narrow range of high luminous intensity and the peripheral area of low luminous intensity are simultaneously applied. To illuminate, the configuration is complicated,
Assembling work becomes complicated and yield decreases. In the configuration of Patent Document 4, the lighting state of a specific LED chip among a plurality of LED chips provided in a single light source unit is controlled in accordance with the traveling state of the vehicle. For this reason, in order to simultaneously illuminate both a narrow range of high luminous intensity and a peripheral area of low luminous intensity, the reflector design and the control mechanism become complicated, the assembling work becomes complicated, and it is disadvantageous in terms of cost.
SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicular lamp that irradiates a high beam and illuminates a narrow area of high light intensity and a peripheral area of low light intensity with a simple configuration.

In order to achieve the above object, the present invention has the following configuration. That is,
A vehicular lamp that illuminates the front of the vehicle,
A first light source unit having a plurality of first LED chips arranged in a width direction of the vehicle; and a light emitting side of the plurality of first LED chips provided to the front of the vehicle. A first light emitting unit including a first reflector that reflects;
A first light source unit having a plurality of second LED chips arranged in the front-rear direction of the vehicle; and a light emission side of the plurality of second LED chips provided to the front of the vehicle. A second light emitting unit including a second reflector to be reflected;
With
The directivity angle in the width direction of the light emitted from the second light emitting unit is larger than the directivity angle of the light emitted from the first light emitting unit;
It is a vehicular lamp.

  The vehicular lamp of the present invention includes two types of light emitting units, a first light emitting unit and a second light emitting unit. A plurality of first LED chips are arranged in the width direction of the vehicle in the first light source unit of the first light emitting unit. On the other hand, a plurality of second LED chips are arranged in the front-rear direction of the vehicle in the second light source unit of the second light emitting unit. Thereby, the directivity angle of the light emitted from the second light emitting unit is larger than the directivity angle of the light emitted from the first light emitting unit. Since the emitted light of the second light emitting unit has a large directivity angle, the luminous intensity is lower than the emitted light of the first light emitting unit. As a result, in the vehicular lamp of the present invention, the emitted light of the first light emitting unit illuminates a narrow area with a higher luminous intensity than the emitted light of the second light emitting unit, and the second light emitting unit emits the emitted light of the first light emitting unit. Compared to the above, the peripheral area of the irradiation area of the first light emitting unit is illuminated with a low luminous intensity. As described above, the vehicular lamp according to the present invention illuminates well a narrow region of high luminous intensity and a peripheral region of low luminous intensity with a simple configuration.

In the vehicular lamp of the present invention, the first light source unit of the first light emitting unit includes a plurality of first LED chips. The kind of 1st LED chip is not specifically limited, A face up type, a flip chip type, etc. are employable. The emission color of the first LED chip is not particularly limited. Further, a fluorescent material that emits fluorescence when excited by the light of the first LED chip may be included in the sealing member so that light of a color different from the original emission color of the first LED chip is emitted. Of the plurality of first LED chips, the emission color of some of the first LED chips may be different from the emission color of other first LED chips. The number of first LED chips can be determined in consideration of the required luminous intensity. For example, 2 to 20, preferably 2 to 10, and more preferably 3 to 5 first LED chips can be used.
The plurality of first LED chips are arranged in the width direction of the vehicle. The “vehicle width direction” refers to a direction that is perpendicular to the longitudinal direction of the vehicle (that is, the straight traveling direction of the vehicle) and parallel to the ground (horizontal plane). The plurality of first LED chips are usually arranged in a straight line, but is not limited to this, and may be arranged in a curved line such as an arc. In addition, the plurality of first LED chips are usually arranged in one row, but the present invention is not limited to this, and may be arranged in a plurality of rows such as two rows or three rows. The interval at which the plurality of first LED chips are arranged can be determined in consideration of the size of the vehicular lamp, the size of the required illumination area, the mounting accuracy, and the like. For example, it can arrange so that the 1st LED chip which adjoins may adjoin substantially.

The first light emitting unit includes a first reflector that is provided on a light emitting side of the plurality of first LED chips and reflects light emitted from the plurality of first LED chips to the front of the vehicle. Here, “front of the vehicle” refers to a straight traveling direction of the vehicle. The shape of the first reflector is a shape along a part of the first virtual paraboloid or a part of the first virtual ellipsoid having a focal point at the position of the first light source unit and having an axis parallel to the longitudinal direction of the vehicle. It is preferable that This is because the light from the first light source part can be reflected forward to generate light having a small directivity angle. For example, the directivity angle of the emitted light of the first light emitting unit is 10 ° left to 10 ° right. Here, the “virtual paraboloid” refers to a curved surface obtained by rotating a parabola around the axis of the parabola. Similarly, the “virtual ellipsoid surface” refers to a curved surface obtained by rotating an ellipse about the axis of the ellipse (either the major axis or the minor axis) as a rotation axis.

The second light source unit of the second light emitting unit includes a plurality of second LED chips. The type and emission color of the second LED chip can be selected in the same manner as the first LED chip. The type and emission color of the second LED chip may be different from the type and emission color of the first LED chip. Further, the number of second LED chips to be used can be determined in the same manner as the first LED chip.
The plurality of second LED chips are arranged in the front-rear direction of the vehicle. The plurality of second LED chips are usually arranged in a straight line, but is not limited to this, and may be arranged in a curved line such as an arc. Moreover, although several 2nd LED chip is normally arrange | positioned in 1 row, it is not limited to this, You may arrange | position in multiple rows, such as 2 rows or 3 rows. The interval at which the plurality of second LED chips are arranged can be determined in the same manner as the first LED chip.

The second light emitting unit includes a second reflector that is provided on the light emitting side of the plurality of second LED chips and reflects the light emitted from the plurality of second LED chips to the front of the vehicle. The emitted light of the second light emitting unit is generated by the second reflector. The directivity angle of the emitted light of the second light emitting unit is larger than the directivity angle of the emitted light of the first light emitting unit. For example, the directivity angle of the radiated light of the first light emitting unit is 25 ° left to 25 ° right. The shape of the second reflector is a virtual composite in which a plurality of second virtual paraboloids or a plurality of second virtual ellipsoids having a focal point at the position of the second light source unit and having an axis parallel to the longitudinal direction of the vehicle are combined. The shape is preferably along a part of the surface. That is, the second reflector is preferably a so-called multi-reflector. With such a configuration, the direction in which the light from the second light source unit is reflected by the second reflector can be set with a high degree of freedom. Note that the “combined virtual composite surface” means that the second virtual paraboloid or the second virtual ellipsoid is selected and a part of the shape is extracted and connected so as to obtain a desired directivity angle. The surface to be formed.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A front view of a vehicular lamp 1 according to an embodiment of the present invention is shown in FIG. The vehicular lamp 1 is a headlamp of a motorcycle. As shown in FIG. 1, the vehicular lamp 1 includes a case 10, an outer lens 11, a high beam irradiation unit 20, and a low beam irradiation unit 30. The high beam irradiation unit 20 includes a first light emitting unit (condensing unit) 21 and a second light emitting unit (diffusion unit) 22. The low beam irradiation unit 30 is provided with a bulb lamp 31.
A cross-sectional view taken along line AA in FIG. 1 is shown in FIG. As shown in FIG. 2, the light collecting unit 21 includes a support member 23, a first light source unit 24, and a first reflector 25. The support member 23 is connected to a vehicle body (not shown), and a first light source unit 24 is provided on the lower surface thereof. The first light source unit 24 includes a substrate 240, on which three first LED chips 241, 242, and 243 are mounted such that the light emission side is in the ground direction (downward in the drawing). The first LED chips 241 to 243 are all white LED chips.

The first reflector 25 is provided on the light emission side of the first LED chips 241 to 243. The surface of the first reflector 25 facing the first LED chips 241 to 243 is a reflective surface by being subjected to aluminum vapor deposition. The shape of the first reflector 25 is a part of the first virtual paraboloid that passes through the first light source unit 24 and has an imaginary line 40 parallel to the front-rear direction of the vehicle as an axis and the position of the first light source unit 24 as a focal point. It is a shape along. In more detail, it demonstrates using the perspective view of the condensing unit 21 shown in FIG. In FIG. 3, the description of the support member 23 and the substrate 240 is omitted. As shown in FIG. 3, first, the first LED chips 241 to 243 are provided along the vehicle width direction Q perpendicular to the vehicle front-rear direction P. That is, the first LED chips 241 to 243 are placed horizontally. The first LED chips 241 to 243 are substantially adjacent to each other. An imaginary line passing through the first LED chip 242 located at the center of the three first LED chips 241 to 243 and parallel to the vehicle front-rear direction P is defined as an axis 40. The first reflector 25 has a shape along the lower half of the virtual paraboloid (below the horizontal plane including the shaft 40) with the position of the first LED chip 242 as the focal point and the axis 40 as an axis, and opens to the front of the vehicle. ing. As shown in FIG. 3, the first reflector 25 having such a shape reflects the reflected light that reflects the light of the first LED chips 241 to 243 forward of the vehicle indicated by the arrow P, and the radiated light X of the light collecting unit 21. Become. The directivity angle of the reflected light X is about 10 ° on one side.

  As shown in FIG. 2, the diffusion unit 22 includes a support member 26, a second light source unit 27, and a second reflector 28. The support member 26 is connected to the vehicle body, and a second light source unit 27 is provided on the lower surface thereof. The second light source unit 27 includes a substrate 270, and three second LED chips 271, 272, and 273 are mounted on the substrate 270 so that the light emission side is in the ground direction. The second LED chips 271 to 273 are all white LED chips.

  The second reflector 28 is provided on the light emission side of the first LED chips 271 to 273. The surface of the second reflector 28 facing the second LED chips 271 to 273 is a reflective surface that is subjected to aluminum vapor deposition. The shape of the second reflector 28 is a combination of a plurality of second virtual paraboloids passing through the second light source unit 27 and having a virtual line 41 parallel to the front-rear direction of the vehicle as an axis and focusing on the position of the second light source unit 27. It is a shape along a part of the shape. In more detail, it demonstrates using the perspective view of the diffusion unit 22 shown in FIG. In FIG. 4, the description of the support member 26 and the substrate 260 is omitted. As shown in FIG. 4, first, the second LED chips 271 to 273 are provided along the front-rear direction P of the vehicle. That is, the second LED chips 271 to 273 are placed vertically. The second LED chips 271 to 273 are substantially adjacent to each other. An imaginary line that passes through the three second LED chips 271 to 273 and is parallel to the longitudinal direction P of the vehicle is defined as an axis 41. The second reflector 28 has a plurality of second virtual paraboloids 28a with the position of the second LED chip 272b as a focal point and the axis 41 as an axis so that the reflected light (radiated light of the diffusing unit) Y has a predetermined directivity angle. -I have a shape in which a part of i is connected, that is, a multi-reflector shape. In addition, the connection part of the 2nd adjacent virtual paraboloid (for example, code | symbol 28a and code | symbol 28b) is formed in the surface parallel to the front-back direction P of a vehicle. As shown in FIG. 4, the light of the second LED chips 271 to 273 is reflected forward of the vehicle indicated by the arrow P (see the reference Y). The reflected light becomes the radiated light Y of the diffusion unit 22. In this embodiment, the directivity angle of the radiated light Y of the diffusing unit 22 is about 25 ° on one side.

Next, the illumination mode of the vehicular lamp 1 will be described. FIG. 5 shows a simulation diagram of the isoluminous intensity distribution of the radiated light of the high beam light emitting section 20 of the vehicular lamp 1. In addition, as a comparative example, instead of the second LED chips 271 to 273 provided (vertically placed) along the vehicle front-rear direction P in the diffusion unit 22, they are provided along the vehicle width direction Q (horizontally placed). Use a high-beam light emitting unit with a diffusing unit having three second LED chips. In FIG. 5, the horizontal axis represents the x direction of the irradiation range, the vertical axis represents the y direction of the irradiation range, (x, y) = (0, 0) represents the center of the irradiation light, and the portion indicated by symbol “a” is a low light intensity region. , The part indicated by symbol b indicates the medium luminous intensity region, and the parts indicated by symbols c and d indicate the high luminous intensity region, respectively. As shown in FIG. 5, in comparison with the comparative example, in the embodiment, the high light intensity areas b and c expand in the width direction of the vehicle and in all directions of the low light intensity area a. The luminous flux of the irradiation light of 20 was improved by about 15% compared with the luminous flux of the irradiation light of the comparative example. As described above, the vehicular lamp 1 has the first LED chips 241 to 243 of the light collecting unit 21 placed horizontally by the high beam light emitting unit 20 and the second LED chips 271 to 273 of the diffusion unit 22 placed vertically. With a simple configuration, the luminous flux of the high-beam light emitting unit 20 is improved, and a narrow area with high luminous intensity (high luminous intensity areas b and c) and a peripheral area with low luminous intensity (low luminous intensity area a) are well illuminated.
If an attempt is made to illuminate both a narrow area with high light intensity and a peripheral area with low light intensity with a single light emitting unit, the reflector shape and optical control become complicated, and the mounting workability deteriorates. However, the vehicular lamp 1 is configured to irradiate a high beam with two types of light emitting units having different directivities, that is, the light collecting unit 21 and the diffusion unit 22. For this reason, the reflector configuration and optical control are not complicated and have a simple configuration, so that the assembling workability is high and the cost is advantageous.
The second reflector 28 has a shape in which a plurality of second virtual paraboloids 28a to 28i are connected to each other. However, the second reflector 28 is not limited to this, and a plurality of second virtual ellipsoids or the like within a range in which a predetermined directivity angle can be obtained. Various curved surfaces and planes may be combined.

  The present invention can be used as a lamp for various vehicles such as motorcycles (two-wheeled vehicles) and automobiles (four-wheeled vehicles).

The present invention is not limited to the description of the embodiments and examples of the invention described above. Various modifications may be included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.
The contents of papers, published patent gazettes, patent gazettes, and the like specified in this specification are incorporated by reference in their entirety.

FIG. 1 is a front view of a vehicular lamp 1. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a perspective view of the light collecting unit 21. FIG. 4 is a perspective view of the diffusion unit 22. FIG. 5 is a simulation diagram of isoluminous intensity distribution of radiated light of the high beam light emitting unit 20.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 10 Case 11 Outer lens 20 High beam light emission part 21 Condensing unit 22 Diffusion unit 23, 26 Support member 24 1st light source part 241, 242, 243 1st LED chip 25 1st reflector 27 2nd light source part 270 Board | substrate 271 272, 273 Second LED chip 28 Second reflector 30 Low beam light emitting unit 31 Bulb lamp 40, 41 axis

Claims (3)

A vehicular lamp that illuminates the front of the vehicle,
A first light source unit having a plurality of first LED chips arranged in a width direction of the vehicle; and a light emitting side of the plurality of first LED chips provided to the front of the vehicle. A first light emitting unit including a first reflector that reflects;
A first light source unit having a plurality of second LED chips arranged in the front-rear direction of the vehicle; and a light emission side of the plurality of second LED chips provided to the front of the vehicle. A second light emitting unit including a second reflector to be reflected;
With
The directivity angle in the width direction of the light emitted from the second light emitting unit is larger than the directivity angle of the light emitted from the first light emitting unit;
Vehicle lamp. The shape of the first reflector is a part of the first virtual paraboloid or part of the first virtual ellipsoid having a focal point at the position of the first light source unit and having an axis parallel to the longitudinal direction of the vehicle. It is a shape along
The shape of the second reflector is a combination of a plurality of second virtual paraboloids or a plurality of second virtual ellipsoids having a focal point at the position of the second light source unit and having an axis parallel to the longitudinal direction of the vehicle. The vehicular lamp according to claim 1, wherein the vehicular lamp has a shape along a part of the virtual composite plane. The vehicular lamp according to claim 1, wherein the vehicle is a two-wheeled vehicle.

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