JP4796031B2 - Vehicle headlight light source and vehicle headlight - Google Patents

Description

  The present invention relates to a vehicle headlamp light source and a vehicle headlamp using a light emitting diode element.

  In recent years, white LEDs (Light Emitting Diodes) have increased in luminous flux and are expected to be applied to vehicle headlamps. In general, vehicle headlamps require a light distribution pattern that spreads in the horizontal direction when the front vertical plane is illuminated, and that the bright and dark areas are clearly separated at a certain height. ing. This light-dark dividing line is called cut-off or cut-off line, and its height is specified so that the oncoming vehicle side is slightly lower than the center side of the vehicle, considering the oncoming vehicle, etc. (See Chapter 3 of the Transport Vehicle Act / Safety Standards for Road Transport Vehicles Article 32 / Notification Article 42 / Attachment 50 and Attachment 51 that stipulate the details of safety standards for road transport vehicles). Further, the required luminous intensity of each of the bright part and the dark part is also stipulated in the safety standard.

As a technique for realizing the vehicle light distribution pattern in a vehicle headlamp using a light emitting diode element, for example, the following is disclosed.
A plurality of white LEDs are mounted on a substrate in an arrangement relationship suitable for a vehicle light distribution pattern (see Patent Document 1). A light shielding plate having an outline suitable for a vehicle light distribution pattern is arranged in front of the LED irradiation direction (see Patent Documents 2 and 3).
JP 2005-85548 A JP-A-2005-63706 JP-A-2005-93191

  However, the technique disclosed in Patent Publication 1 does not take into account the specific shape of the phosphor layer and the specific relationship between the position of the LED and the phosphor, and it is impossible to obtain a clear cut-off line. There is. In addition, the techniques disclosed in Patent Documents 2 and 3 can obtain a clear cut-off line, but there is a problem that the light use efficiency is low because a light amount loss occurs due to light shielding. In any case, it is difficult to say that a practical vehicle headlamp light source can be obtained.

  Accordingly, in view of the above problems, the present invention provides a vehicle headlamp light source and a vehicle headlamp using a light emitting diode element, which can obtain a clear cut-off line while realizing a light distribution pattern suitable for a vehicle headlamp. The purpose is to provide.

Vehicle headlamp light source according to the present invention includes a light emitting diode element number multiple mounted on the surface of the substrate, the front surface wavelength conversion disposed of the substrate so as to cover the light emitting diode element before Kifuku number When viewed from a direction perpendicular to the surface of the substrate, the wavelength conversion member has an edge that is bent at a substantially central portion at a part of the periphery thereof and has a step on a linear portion on both sides of the central portion, the light emitting diode element before Kifuku number is localized in the edges closer in the region surrounded by the periphery of the wavelength conversion member, the plurality of light emitting diode elements is in the region surrounded by the periphery of the wavelength conversion member The light emitting diode elements belonging to the line closest to the end edge have a distance of 50 μm or more from the edge of the mounting pitch of the light emitting diode elements. Below average It is arranged to be in the range.

  The vehicle headlamp according to the present invention includes the above-described vehicle headlamp light source.

  According to the above configuration, since the entire wavelength conversion member emits light upon receiving light from the light emitting diode element, the shape of the periphery of the wavelength conversion member when viewed from the direction perpendicular to the substrate determines the light distribution pattern. The edge of the wavelength conversion member includes an edge that is bent substantially at the center and has a step on the linear part on both sides of the center. A light distribution pattern for a vehicle headlamp that is slightly lower than that on the own vehicle side can be realized. Further, since the light emitting diode elements are unevenly distributed near the edge, the emission intensity in the vicinity of the edge can be increased, and as a result, the cut-off line can be clarified.

The best mode for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is a trihedral view showing the outer shape of a vehicle headlamp light source according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view showing the AA cross section shown in FIG. FIG. 3 is a diagram showing the positional relationship between the fluorescent member and the light emitting diode elements on the substrate surface.

  The vehicle headlamp light source 10 includes a ceramic substrate 11, a fluorescent member 12, a wiring pattern 13, and light emitting diode elements 14a-14k. The light emitting diode elements 14 a to 14 k are mounted on the surface of the ceramic substrate 11 so as to be electrically connected to the wiring pattern 13. The fluorescent member 12 is formed on the surface of the ceramic substrate 11 so as to cover the light emitting diode elements 14a-14k. The fluorescent member 12 is solidly molded using a translucent material (eg, silicone) containing phosphor particles, and partially absorbs blue light emitted from the light emitting diode elements 14a-14k to emit yellow light. . The vehicle headlamp light source 10 functions as a white light source by appropriately mixing yellow light emitted from the fluorescent member 12 and blue light emitted from the light emitting diode elements 14a-14k.

  When viewed from a direction perpendicular to the surface of the ceramic substrate 11, the fluorescent member 12 has a substantially rectangular shape, bends in a crank shape at a substantially center 12b, and is approximately 0.3 mm at straight portions 12a and 12c on both sides of the center. The upper edge has a step (see FIGS. 1 and 3). That is, the straight portion 12a protrudes by a step of about 0.3 mm from the straight portion 12c. Due to the shape of the upper edge, it is possible to realize a light distribution pattern in which the height of the cut-off line is slightly lower on the oncoming vehicle side than on the own vehicle side.

  Further, the light emitting diode elements 14a-14k are unevenly distributed near the upper edge in the region surrounded by the peripheral edges 12a-12f of the fluorescent member 12 when viewed from the direction perpendicular to the surface of the ceramic substrate 11 (see FIG. 3). Thereby, the light emission intensity in the vicinity of the upper edge can be increased, and the cut-off line can be made clear. Here, “is unevenly distributed near the upper edge” means that the mounting center 15 of the light emitting diode element is closer to the upper edge 12a-12c than the center 16 of the fluorescent member. The mounting center 15 of the light emitting diode element indicates a centroid of a figure formed when the light emitting diode elements 14a to 14k are projected on the surface of the ceramic substrate 11, and the center 16 of the fluorescent member indicates the fluorescent member 12 on the surface of the ceramic substrate 11. The centroid of the figure that is created when projected onto

  Further, when viewed from the direction perpendicular to the surface of the ceramic substrate 11, the light emitting diode elements 14a-14k are stepped between the straight portions 12a, 12c on both sides of the substantially central portion in the direction parallel to the upper edges 12a-12c of the fluorescent member 12. Is unevenly distributed closer to the protruding linear portion 12a. As a result, it is possible to increase the light emission intensity particularly in the vicinity of the straight line portion 12a in the vicinity of the upper edge, and to brighten the own vehicle side more than the oncoming vehicle side in the bright part of the light distribution pattern. Here, “is unevenly distributed near the straight portion 12 a” means that the mounting center 15 of the light emitting diode element is straighter than the center 16 of the fluorescent member when focusing on the direction parallel to the upper end edges 12 a to 12 c of the fluorescent member 12. The case where it exists near the part 12a shall be said.

  The light emitting diode elements 14a-14k are arranged in two rows along the upper edge 12a-12c of the fluorescent member 12, and among these, the light emitting diode elements 14a-14g belonging to the first row counting from the upper edge 12a-12c. In any case, it is desirable that the distance d from the upper edge is 50 μm or more and not more than the average value of the mounting pitch p of the light emitting diode elements. By making the light emitting diode element mounting pitch p equal to or less than the average value, the ratio of the light of the light emitting diode elements 14a to 14g absorbed by the fluorescent member 12 can be made substantially uniform. Color unevenness can be reduced. Moreover, by setting it as 50 micrometers or more, the fluorescent member 12 can be formed using the fluorescent substance particle whose center particle diameter generally utilized is about 5-20 micrometers.

  The light emitting diode elements 14a to 14g are all arranged such that the distance d from the upper edge is closer to the distance t from the upper surface of the fluorescent member 12 to the upper surface of the light emitting diode element. By doing in this way, the emitted light intensity in the vicinity of the upper end edge of the upper surface of the fluorescent member 12 can be increased compared with the part other than the upper end edge of the upper surface, and the cut-off line can be made clear. The distance d from the upper edge of the light emitting diode elements 14a-14g and the mounting pitch p of the light emitting diode elements are defined in FIGS. 7 and 8, and the distance t from the upper surface of the fluorescent member 12 to the upper surface of the light emitting diode element. Is defined in FIG.

  Of the two columns composed of the light emitting diode elements 14a-14k, the first column includes seven light emitting diode elements and the second column includes four light emitting diode elements, counting from the top edges 12a-12c. (See FIG. 3). As described above, the row closest to the upper end edges 12a-12c has the largest number of light emitting diode elements, whereby the light emission intensity in the vicinity of the upper end edge can be increased and the cut-off line can be made clearer.

  As shown in FIG. 4, the light emitting diode elements 14a-14g belonging to the first row counting from the upper edge 12a-12c are all arranged so that the distance d from the upper edge is substantially constant. Also good. In this way, the emission intensity and emission color in the vicinity of the upper edge can be made uniform, so that the illuminance unevenness and color unevenness in the bright part near the cutoff line can be reduced.

  Further, as shown in FIG. 5, the mounting pitch p of the light emitting diode elements in the direction parallel to the upper edge 12a-12c may be increased as the distance from the approximate center 12b of the upper edge is increased. In this way, the change in light emission intensity in the direction parallel to the upper edge can be moderated, and the horizontal illuminance change in the bright part of the light distribution pattern can be moderated.

As shown in FIG. 6, the number of light emitting diode elements may be one.
Further, as shown in FIGS. 9 and 10, the fluorescent member 12 has a side end surface corresponding to the upper end edge and an upper surface of the fluorescent member 12 connected to each other by an outwardly convex curved surface, that is, the side corresponding to the upper end edge. You may form so that a corner | angular part 12g of an end surface and the upper surface of the fluorescent member 12 may have a curvature. In this way, the change in the optical path length in the fluorescent member 12 due to the light emission angle can be reduced, and the color unevenness in the bright part near the cutoff line can be further reduced. Further, the fluorescent member 12 is such that the side end surface corresponding to the upper end edge and the surface of the ceramic substrate 11 are substantially perpendicular, that is, the corner portion 12h between the side end surface corresponding to the upper end edge and the surface of the ceramic substrate 11 is substantially perpendicular. It may be formed as follows. In this way, it is possible to reduce illuminance unevenness in a bright part near the cutoff line.

Further, as shown in FIG. 11, the fluorescent member 12 may be formed such that the side end face 12i corresponding to the upper end edge is inclined upward. In this way, the change in the optical path length in the fluorescent member 12 due to the light emission angle can be reduced, and the color unevenness in the bright part near the cutoff line can be further reduced.
As shown in FIGS. 12 and 13, the thickness of the fluorescent member 12 may be reduced as the distance from the light emitting diode element increases. In this way, the change in the optical path length in the fluorescent member 12 due to the light emission angle can be reduced, and the color unevenness in the bright part of the light distribution pattern can be further reduced. In this case, the thickness of the fluorescent member 12 may be gradually reduced by providing an inclination 12j on the upper surface of the fluorescent member 12 as shown in FIG. 12, or the upper surface of the fluorescent member 12 as shown in FIG. The thickness of the fluorescent member 12 may be gradually reduced by providing the stepped shape 12k. Although FIG. 13 shows a case where the thickness of the fluorescent member 12 is changed in one stage, there may be a plurality of thickness changes, and the side end surface corresponding to the upper edge is formed perpendicular to the substrate surface. It may be formed, and may be formed so as to incline upward.

In the example of FIG. 14, the phosphor concentration is decreased from the side end surface 12 m corresponding to the upper end edge of the fluorescent member 12 toward the side end surface 12 n corresponding to the lower end edge. In this way, the change in the amount of light absorbed in the fluorescent member 12 due to the light emission angle can be reduced, and the color unevenness in the bright portion of the light distribution pattern can be further reduced. In this case, the phosphor concentration may be gradually changed or may be changed stepwise. For example, the following method can be used to create the fluorescent member 12 in which the phosphor concentration is gradually changed. When phosphor particles having various particle diameters are dispersed in a resin such as silicone whose viscosity is adjusted by adding fine particles such as SiO ₂ , the particles settle while having a concentration gradient due to their own weight. By curing in the middle of the sedimentation, a phosphor-containing resin having a concentration gradient can be obtained, and can be prepared by molding with a predetermined size. In addition, in order to create the fluorescent member 12 with the phosphor concentration changed step by step, the fluorescent member 12 having several types of phosphor concentrations is bonded, and cut and formed in a direction perpendicular to the bonding surface. Is possible.
(Embodiment 2)
FIG. 15 is a three-sided view showing the outer shape of the vehicle headlamp light source according to Embodiment 2 of the present invention, and FIG. 16 is a cross-sectional view showing the AA cross section shown in FIG.

The vehicle headlamp light source 20 includes a ceramic substrate 11, a fluorescent member 12, a wiring pattern 13, light emitting diode elements 14 a to 14 k and a light shielding member 21. The vehicle headlamp light source 20 according to the second embodiment is different from the vehicle headlamp light source 10 according to the first embodiment in that a light shielding member 21 is provided. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted.
The light shielding member 21 is formed by processing a metal material such as aluminum, is disposed on the surface of the ceramic substrate 11 adjacent to the fluorescent member 12, and faces the side end surface corresponding to the upper edge of the fluorescent member 12. And has a surface 21a. Thereby, the leakage of light from the side end surface corresponding to the upper end edge of the fluorescent member 12 can be prevented, and the cut-off line can be made clearer. In addition, since the light shielding member 21 does not cover the upper surface of the fluorescent member 12 (see FIGS. 15 and 16), the light use efficiency is not reduced in obtaining the vehicle light distribution pattern. Further, by making the surface 21a a mirror-finished surface or a diffusive reflecting surface, it is possible to reflect light and improve the light utilization efficiency. As shown in FIGS. 17 and 18, by tilting the surface 21a upward, the light reflection direction can be made closer to the direction perpendicular to the surface of the ceramic substrate 11, and the light utilization efficiency can be further improved. it can.

The light shielding member 21 is not limited to the above example, and a metal foil may be attached to a side end surface corresponding to the upper end edge of the fluorescent member 12, or a metal vapor deposition film may be formed. Moreover, as long as there is a light shielding function, it is not limited to metal materials.
(Embodiment 3)
FIG. 19 is a three-view diagram illustrating the outer shape of a vehicle headlamp light source according to Embodiment 3 of the present invention.

The vehicle headlamp light source 30 includes a ceramic substrate 11, a fluorescent member 12, a wiring pattern 13, light emitting diode elements 14 a to 14 k, and a low reflection member 31. The vehicle headlamp light source 30 according to the third embodiment is different from the vehicle headlamp light source 10 according to the first embodiment in that a low reflection member 31 is provided. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted.
The low reflection member 31 has a reflectance lower than that of the surface of the ceramic substrate 11, and is disposed so as to cover the outer edge region of the upper end edges 12 a to 12 c of the fluorescent member 12 on the surface of the ceramic substrate 11. Thereby, it can suppress that the light leaked from the side end surface corresponding to the upper end edge of the fluorescent member 12 reflects on the surface of the ceramic substrate 11, and can make a cutoff line clearer. The low reflection member 31 may be formed by applying a dark color and low reflectance pigment such as carbon black, a dye or a paint, or a resin containing the pigment, dye or paint such as a resist. It may be molded from rubber or glass. Further, various metal or alloy plating such as black nickel plating or black chromate treatment on black plating, or chemical treatment applied to the plating, or a metal material coated with an oxide film such as alumite may be used. The low reflection member 31 may be disposed directly on the surface of the ceramic substrate 11 or may be disposed on a metal pattern formed on the surface of the ceramic substrate 11.
(Embodiment 4)
FIG. 20 is a three-sided view showing the outer shape of the vehicle headlamp light source according to Embodiment 4 of the present invention, and FIG. 21 is a cross-sectional view showing the AA cross section shown in FIG.

The vehicle headlamp light source 40 includes a ceramic substrate 11, a fluorescent member 41, a wiring pattern 13, light emitting diode elements 14 a to 14 k, and a translucent member 42. The vehicle headlamp light source 40 according to the fourth embodiment differs from the vehicle headlamp light source 10 according to the first embodiment in that the vehicle headlamp light source 40 includes a translucent member 42. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted.
The translucent member 42 is solidly molded using a translucent material (eg, silicone resin) that does not contain phosphor particles. The fluorescent member 41 is disposed on the surface of the ceramic substrate 11 so as to cover the translucent member 42. In this way, the thickness of the fluorescent member 41 can be reduced while maintaining the outer dimension of the fluorescent member 41 at an appropriate size. Therefore, the difference in the optical path length in the fluorescent member 41 due to the difference in the emission angle of light from the light emitting diode element can be reduced, and the color unevenness in the bright part of the light distribution pattern can be reduced.

Moreover, the translucent member 43 of FIG. 22 contains a filler in order to give diffusibility. By imparting diffusivity in this way, color unevenness in the bright part of the light distribution pattern can be further reduced.
As shown in FIG. 23, the fluorescent member 41 includes a top plate portion that covers the light emitting diode elements 14a to 14k and a peripheral wall portion that hangs down from the periphery of the top plate portion to the surface of the ceramic substrate 11, and The gas 44 may be sealed in a space surrounded by the plate portion, the peripheral wall portion, and the ceramic substrate 11. Even in this way, the color unevenness in the bright part of the light distribution pattern can be reduced.

Further, as shown in FIG. 24, an uneven member 45 for reflecting light in a direction perpendicular to the surface of the ceramic substrate 11 is planar in a region surrounded by the periphery of the fluorescent member 41 on the surface of the ceramic substrate 11. Alternatively, it may be arranged in a line or dot shape. By doing so, the light utilization efficiency can be increased. The uneven members 45 are densely arranged as the distance from the light emitting diode element increases (see FIG. 24). Thereby, the illuminance change in the bright part of the light distribution pattern can be moderated.
(Embodiment 5)
25 is a three-sided view showing the outer shape of the vehicle headlamp light source according to the fifth embodiment of the present invention, and FIG. 26 is a cross-sectional view showing the AA cross section shown in FIG.

  The vehicle headlamp light source 50 includes a ceramic substrate 11, a fluorescent member 51, a wiring pattern 13, and light emitting diode elements 14a-14k. The vehicle headlamp light source 50 according to the fifth embodiment is implemented in that the surface of the ceramic substrate 11 has a recessed portion 52 deeper than the thickness of the light emitting diode element, and the light emitting diode elements 14a-14k are mounted in the recessed portion 52. This is different from the vehicle headlamp light source 10 of the first embodiment.

The fluorescent member 51 may be formed of a resin material or a ceramic material as shown in FIG. 26, and the recessed portion 52 may be bridged by its own strength, or as shown in FIG. It is good also as forming on the translucent board | plate material 53 made. If the translucent plate 53 is formed of a material having good thermal conductivity such as alumina, the heat of the fluorescent member 51 can be efficiently released, and as a result, the luminous efficiency can be increased. In addition to alumina, materials such as AlN and diamond are conceivable as materials for the translucent plate material. In addition, even when a material having a relatively low thermal conductivity, such as glass mainly composed of silica, is used as a light-transmitting plate, it is possible to improve the thermal conductivity by arranging a thin film such as diamond-like carbon on the surface. As a result, the luminous efficiency can be further increased. Further, as shown in FIG. 28, the heat radiation performance can be further enhanced by sandwiching the fluorescent member 51 between the translucent plates 53 and 55. Further, the translucent plates 53 and 55 are preferably formed on the surface thereof with a rough structure, an optical thin film, and a periodic structure such as a photonic crystal. The interface between the fluorescent member 51 and the translucent plates 53 and 55 is preferably in contact as a surface through a translucent member having a refractive index greater than 1, such as silicone resin. Thereby, when light propagates in these materials, confinement of light due to a difference in refractive index with an adjacent member, particularly air, can be reduced, and luminous efficiency can be further increased. Further, it is desirable to form an antireflection film such as a dielectric vapor deposition film on the surface on the side where the light from the light emitting diode element enters the translucent plate material from the air. Thereby, the light emission of the light emitting diode element can be propagated without loss at the interface of the members having different refractive indexes, and the light emission efficiency can be further increased.
(Embodiment 6)
FIG. 29 is a cross-sectional view of a vehicle headlamp according to Embodiment 6 of the present invention.

The vehicle headlamp 60 includes a vehicle headlamp light source 10, a base 61 having a radiation fin, a lens 62, and a lens support member 63. The diameter of the lens 62 is 60 mm, and the distance from the surface of the vehicle headlamp light source 10 to the principal point of the lens 62 is 35 mm.
The inventors created a vehicle headlamp according to an embodiment of the present invention, and verified whether the light distribution pattern complies with the standard. The verification results are shown below.

  FIG. 30 is a diagram in which auxiliary lines and representative measurement points defined in the standard are superimposed on a photograph of a light distribution pattern of a vehicle headlamp according to an embodiment of the present invention, and FIG. 31 is defined in the standard. It is a figure which shows the measurement result of the representative measurement point in the light distribution pattern of the required required luminous intensity, the light distribution pattern of one Example of this invention, and the light distribution pattern of a reference example. FIG. 32 is a diagram for explaining the measurement conditions of the light distribution pattern.

  The vehicle headlamp light source created this time is a modified version of the external structure of the vehicle headlamp light source shown in FIG. 20, and has a sectional structure shown in FIG. 24 elements are mounted. The vehicle headlamp light source shown in FIG. 20 has an external structure in which the straight portion 41a protrudes by a step with respect to the straight portion 41c. It is assumed that the straight portion 41c has an outer shape projecting by a step with respect to the straight portion 41a. The photograph shown in FIG. 30 is a photograph of a light distribution pattern formed by illuminating the vehicle headlamp light source and irradiating a screen 25 m ahead using the optical system shown in FIG. In the optical system shown in FIG. 29, the light distribution is symmetric with respect to the center point. Therefore, due to the above specification change, the cut-off line height is slightly lower on the oncoming vehicle side (right side) than on the own vehicle side (left side). A pattern can be realized.

  As shown in FIG. 31, in the safety standard attachment 50, the required luminous intensity at the measurement point 1 (0.6D-1.3L) is 8000 cd or more, and the necessary luminous intensity at the measurement point 2 (0.5 U-1.5R) is 840. It is defined as follows. JIS D 5500-1995 stipulates that the required luminous intensity at measurement point 3 (1.5D-2L) is 15000 or more and the necessary luminous intensity at measurement point 4 (1U-1R) is 700 or less.

The notation representing the position of the measurement point is as defined in FIG. FIG. 32 shows a point represented by (1D-0.5L) as an example.
When measured with the vehicle headlamp light source according to one embodiment of the present invention, 16500 cd was obtained at measurement point 1, 300 cd at measurement point 2, 17700 cd at measurement point 3, and 270 cd at measurement point 4.

As a reference example, measurement was performed with a commercially available halogen lamp, and 15000 cd was obtained at measurement point 1, 500 cd at measurement point 2, 16750 cd at measurement point 3, and 438 cd at measurement point 4.
From the above measurement results, it can be said that the vehicle headlamp light source of one embodiment of the present invention can obtain a light distribution pattern conforming to the standard and a clear cut-off line. In addition, it can be said that it has equivalent or better performance than the current halogen lamp.

Note that safety standard attachment 50 and JIS D 5500-1995 are standards relating to the current light source, and use of light-emitting diode elements is not assumed. However, at present, there is no standard for a vehicle headlamp light source that uses a light-emitting diode element.
As described above, the vehicle headlamp light source and the vehicle headlamp according to the present invention have been described based on the embodiments. However, the present invention is not limited to these embodiments. For example, the following modifications can be considered.
(1) In the embodiment, white light is obtained by a combination of a blue light emitting diode and a yellow phosphor. However, the present invention is not limited to this, and the degree of freedom of color temperature is improved, the color rendering property is improved, and the luminous efficiency is increased. For the purpose, it may be a combination of blue light emitting diodes and phosphors emitting yellow and red light, or a combination of ultraviolet light emitting diodes and phosphors emitting three primary colors (red, green, and blue), which emits orange light. It is also possible to obtain white light by including a phosphor that performs the above process in the combination.
(2) In the embodiment, the fluorescent member is described as having a substantially rectangular shape, but the edges other than the upper edge (12d, 12e, 12f in FIG. 1) may have any shape. For example, it may be arcuate or polygonal.
(3) In the embodiment, a phosphor is used as a wavelength conversion material, but in addition to a general phosphor, a light that absorbs and absorbs light of a certain wavelength, such as a semiconductor, a metal complex, an organic dye, or a pigment Can be used in the present invention without particular limitation as long as the material contains substances that emit light of different wavelengths. These may be used as a mixture with a resin such as silicone or a translucent member such as glass. As a general phosphor, silicate phosphor (Ba, Sr) ₂ SiO ₄ : Eu ²⁺ , oxynitride phosphor, garnet phosphor, sulfide phosphor, α-sialon phosphor, and the like can be considered. These phosphors may be powder particles or a light-transmitting sintered body such as light-transmitting fluorescent ceramics.
(4) In the embodiment, the shape of the light emitting diode element viewed from the direction perpendicular to the substrate surface is a square, but this shape may be a rectangle or a shape other than a rectangle. Further, materials of light-emitting diode elements that emit blue or ultraviolet light are known mainly of GaN and AlN, but any other material such as ZnS or ZnSe may be used. In addition to flip-chip mounting using gold bumps as a method for mounting light-emitting diode elements on a substrate, metal eutectic bonding such as Au-Sn, bonding with Ag paste, or using a general die bond agent such as Au A method of wire bonding, a combination of these mounting methods, or a method of mounting a chip mounted in advance on a Si or ceramic submount equipped with a power supply terminal on the substrate by the above method is conceivable. The invention can be realized by any of these mounting methods. In addition, for the purpose of improving the light extraction efficiency and the purpose of changing the light distribution from the element, the light emitting diode element can be used for etching and photolithographic methods on its light emitting surface to create irregularities and photonic crystals. It is also possible to arrange a micro optical member made of resin or inorganic material. The micro optical member is an optical member having functions such as a lens, polarization, and diffusion that are equal to or less than those of the light emitting diode element, and may contain an inorganic filler.
(5) Although the substrate is a ceramic substrate in the embodiment, AlN, Al ₂ O ₃ , BN, MgO, ZnO, SiC, C, or a mixture thereof can be considered as the ceramic material. The material of the substrate is not limited to ceramic, and a metal base substrate using Al, Cu, Fe, Au or an alloy containing these, a glass epoxy substrate, or the like may be used.

  The present invention can be used, for example, in an automobile headlamp.

The three-plane figure which shows the external shape of the vehicle headlamp light source which concerns on Embodiment 1 of this invention Sectional drawing which shows AA cross section The figure which shows the arrangement | positioning relationship of the fluorescent member and light emitting diode element in the substrate surface The figure which shows the arrangement | positioning relationship of the fluorescent member and light emitting diode element in the substrate surface The figure which shows the arrangement | positioning relationship of the fluorescent member and light emitting diode element in the substrate surface The figure which shows the arrangement | positioning relationship of the fluorescent member and light emitting diode element in the substrate surface Diagram for explaining the definition of mounting pitch and distance Diagram for explaining the definition of mounting pitch and distance Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Three views showing an outer shape of a vehicle headlamp light source according to Embodiment 2 of the present invention Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Three views showing the outer shape of a vehicle headlamp light source according to Embodiment 3 of the present invention Three views showing an outer shape of a vehicle headlamp light source according to a fourth embodiment of the present invention Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Three views showing an outer shape of a vehicle headlamp light source according to a fifth embodiment of the present invention Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing which shows AA cross section Sectional drawing of the vehicle headlamp which concerns on Embodiment 6 of this invention FIG. 2 is a diagram in which auxiliary lines and representative measurement points defined in the standards are superimposed on a photograph of a light distribution pattern of a vehicle headlamp according to an embodiment of the present invention The figure which shows the measurement result of the representative measurement point in the light distribution pattern of the reference luminous intensity determined in the standard, the light distribution pattern of one embodiment of the present invention, and the light distribution pattern of the reference example Diagram for explaining measurement conditions of light distribution pattern

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 20, 30, 40, 50 Vehicle headlamp light source 11 Ceramic substrate 12, 41, 51 Fluorescent member 12a The protruding straight part of the upper edge 12b The approximate center of the upper edge 12c The recessed straight line of the upper edge Part 12d Right end edge 12e Lower end edge 12f Left end edge 12g Corner portion between side end surface corresponding to upper end edge and upper surface 12h Corner portion between side end surface corresponding to upper end edge and ceramic substrate surface 12i Side end surface corresponding to upper end edge 12j Inclined 12k Stepped upper surface 12m Side end surface corresponding to upper end edge 12n Side end surface corresponding to lower end edge 13 Wiring pattern 14a-14k Light emitting diode element 15 Mounting center of light emitting diode element 16 Center of fluorescent member 21 Light shielding member 21a Upper end edge The surface facing the side end surface corresponding to the surface 31 Low reflective member 42 Translucent member 43 Transparent material containing filler Optical member 44 Gas 45 Convex and concave reflecting member 52 Concave portion 53, 55 Translucent plate material 54, 56 Support member 60 Vehicle headlamp 61 Base 62 Lens 63 Lens support member

Claims (19)

And multiple light-emitting diode element mounted on a surface of the substrate,
Before a wavelength conversion member disposed on the front surface of the substrate so as to cover the light emitting diode element Kifuku number,
When viewed in a direction perpendicular to the surface of the substrate, the wavelength conversion member has an edge that remembering a step in the linear portion of the substantially central sides and bent at a substantially central part of its periphery, before Kifuku number of The light emitting diode element is unevenly distributed near the edge in a region surrounded by the periphery of the wavelength conversion member ,
The plurality of light emitting diode elements form one or more rows along the edge in a region surrounded by a periphery of the wavelength conversion member,
All of the light emitting diode elements belonging to the row closest to the edge are arranged such that the distance from the edge is in a range of 50 μm or more and less than the average value of the mounting pitch of the light emitting diode elements. Vehicle headlamp light source. The plurality of light emitting diode elements form one or more rows along the edge in a region surrounded by a periphery of the wavelength conversion member,
2. The vehicle headlamp light source according to claim 1, wherein all of the light emitting diode elements belonging to the row closest to the edge are arranged so that a distance from the edge is substantially constant. The plurality of light emitting diode elements form one or more rows along the edge in a region surrounded by a periphery of the wavelength conversion member,
The light emitting diode elements belonging to the row closest to the edge are all arranged such that the distance from the edge is closer to the distance from the upper surface of the wavelength conversion member to the upper surface of the light emitting diode element. The vehicle headlamp light source according to claim 1, wherein: The plurality of light emitting diode elements form one or more rows along the edge in a region surrounded by a periphery of the wavelength conversion member,
The vehicle headlamp light source according to claim 1, wherein a mounting pitch of the light emitting diode elements in a direction parallel to the end edge becomes wider as the distance from the substantially center of the end edge increases. The plurality of light emitting diode elements form a plurality of rows in a region surrounded by a periphery of the wavelength conversion member,
The vehicle headlamp light source according to claim 1, wherein the row closest to the end edge has the largest number of light emitting diode elements among all the rows. Emitting diode element before Kifuku number further when viewed in a direction perpendicular to the surface of the substrate, the end in a direction parallel to the edge and projects by the step of substantially the center on both sides of the linear portion of the edge The vehicle headlamp light source according to claim 1, wherein the vehicle headlamp light source is unevenly distributed closer to a straight line portion. The upper surface of the wavelength conversion member is substantially parallel to the surface of the substrate, and the wavelength conversion member is formed such that a side end surface corresponding to the edge and the upper surface are connected to each other by a curved surface protruding outward. The vehicle headlamp light source according to claim 1. 2. The vehicle headlamp light source according to claim 1, wherein the wavelength conversion member is formed such that a side end surface corresponding to the end edge is substantially perpendicular to a surface of the substrate. The vehicle headlamp light source according to claim 1, wherein the wavelength conversion member is formed such that a side end surface corresponding to the end edge is inclined upward. The thickness of the wavelength conversion member, the vehicle headlamp light source according to claim 1, characterized in that gradually decreases the distance from the light emitting diode element before Kifuku number leaves. The concentration of wavelength converting material of the wavelength conversion member, the vehicle headlamp light source according to claim 1, characterized in that lower with distance from the light emitting diode element before Kifuku number leaves. 2. The vehicle headlamp light source according to claim 1, wherein an uneven member having a reflection function is disposed in a region surrounded by a peripheral edge of the wavelength conversion member on the surface of the substrate. The vehicle headlamp light source further includes a light shielding member disposed adjacent to the wavelength conversion member, and the light shielding member has a surface facing a side end surface corresponding to the edge of the wavelength conversion member. The vehicle headlamp light source according to claim 1, wherein the light source has no surface facing the upper surface of the wavelength conversion member. The vehicle headlamp light source according to claim 13, wherein a surface facing the side end surface corresponding to the end edge of the light shielding member is a reflecting surface. The vehicle headlamp light source further includes a low reflection member having a reflectance lower than a reflectance of the surface of the substrate, and the low reflection member is formed on the edge of the wavelength conversion member on the surface of the substrate. The vehicle headlamp light source according to claim 1, wherein the vehicle headlamp light source is disposed so as to cover an outer edge region. Wherein the wavelength conversion member, claims made of a translucent material containing the particles of wavelength converting material, characterized in that it is formed on the solid on the surface of the substrate so as to cover the light emitting diode element before Kifuku number Item 4. A vehicle headlamp light source according to Item 1. The vehicle headlamp light source is further made of a translucent material which does not contain particles of wavelength converting material, before Kifuku number of light emitting diodes translucent formed solid on the surface of the substrate so as to cover the element Comprising a member,
The vehicle headlamp light source according to claim 1, wherein the wavelength conversion member is formed on a surface of the substrate so as to cover the translucent member. Wall and the wavelength conversion member, which consists of light-transmitting material containing particles of wavelength converting material, hanging down from the peripheral edge of the front top plate covering a number of light emitting diode elements Kifuku and the top plate portion on the surface of the substrate And consists of
The vehicle headlamp light source according to claim 1, wherein gas is sealed in a space surrounded by the top plate portion and the peripheral wall portion of the wavelength conversion member and the substrate.   A vehicle headlamp using the vehicle headlamp light source according to claim 1.