JP2018041723A - Light emitting module and vehicular headlight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new structure that improves luminance of a light emitting module.SOLUTION: A light emitting module 22 comprises a first light source, a second light source whose light emitting characteristics are different from those of the first light source, and a light wavelength conversion part 42 that converts wavelengths of first light emitted by the first light source and second light emitted by the second light source. The first light source may comprise an LED chip 40 arranged near the light wavelength conversion part 42. The second light source may comprise an LD element 34 arranged farther from the light wavelength conversion part 42 than the first light source.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light emitting module.

  Conventionally, a vehicular lamp in which a white light emitting module made of an LED chip and a phosphor is arranged on a substrate has been devised (see Patent Document 1). Such a white light emitting module realizes white light by mixing the phosphor light excited by the light emitted from the LED chip and the emitted light of the LED chip.

JP 2014-36202 A

  By the way, when using the white light emitting module as described above as a high-luminance light source, techniques such as reducing the light emitting area by reducing the phosphor size and increasing the output of the LED chip have been adopted. However, since the former is accompanied by a decrease in luminous flux, it is difficult to significantly improve the luminance. In the latter case, it is necessary to increase the current density in the LED chip by flowing a large amount of current. However, as the current density increases, the light output is saturated or decreased due to a decrease in light emission efficiency. There is.

  This invention is made | formed in view of such a condition, The place made into the objective is to provide the new structure which improves the brightness | luminance of a light emitting module.

  In order to solve the above problems, a light emitting module according to an aspect of the present invention includes a first light source, a second light source having a light emission characteristic different from that of the first light source, and first light and second light source emitted from the first light source. An optical wavelength converter that converts the wavelength of the emitted second light.

  According to this aspect, since light emitted from a plurality of light sources is wavelength-converted by the light wavelength conversion unit, the light emitted from the light source module is compared with a case where light emitted from one light source is wavelength-converted by the light wavelength conversion unit. Brightness can be increased. Here, the case where the light emission characteristics are different includes, for example, a case where specifications such as directivity, light emission wavelength, excitation wavelength, light source luminance, half width of light emission spectrum, and the like differ depending on the light source.

  The directivity of the first light source and the directivity of the second light source may be different. Thereby, a part of luminance can be increased.

  The first light source is configured to irradiate the first light from one surface side of the light wavelength conversion unit, and the second light source irradiates the second light from the other surface side of the light wavelength conversion unit. It may be configured to. Thereby, the freedom degree of arrangement | positioning of a 1st light source and a 2nd light source increases.

  The 1st light source may have a light emitting diode arranged near the light wavelength conversion part. The second light source may include a laser diode arranged farther from the light wavelength conversion unit than the first light source.

  The optical wavelength converter may be arranged such that the longitudinal direction of the surface irradiated with the laser beam emitted from the laser diode is along the longitudinal direction of the spot shape of the laser beam. Thereby, the laser beam light can be efficiently used as the excitation light of the optical wavelength conversion unit.

  The optical wavelength converter is arranged so that the short side of the surface irradiated with the laser beam emitted from the laser diode is along the longitudinal direction of the spot shape of the laser beam, and the laser beam is irradiated. The width in the longitudinal direction of the spot shape of the laser beam light may be configured to be narrower than the width in the short direction of the surface. Thereby, the brightness | luminance of a part of optical wavelength conversion part can be raised.

  You may have the light-shielding part surrounding the light emission surface on the opposite side to the surface of the light wavelength conversion part into which the light which a light emitting diode emits enters. Thereby, an irradiation area | region is realizable with sufficient precision according to the shape of a light emission surface.

  You may have the light-shielding part arrange | positioned in the direction in which the laser beam light which a laser diode emits specularly reflected on the surface of the optical wavelength conversion part. Thereby, it can suppress that the laser beam light specularly reflected on the surface of the optical wavelength conversion part is emitted outside the module.

  The light wavelength converter is excited by the first light emitted from the first light source, excited by the first phosphor emitting the converted light of the first color, and the second light emitted by the second light source, A second phosphor that emits color-converted light. Thereby, the freedom degree of the combination of the 1st light source and 2nd light source from which light emission characteristics differ by selecting a 1st fluorescent substance and a 2nd fluorescent substance, respectively becomes high. In addition, since the first light emitted from the first light source, the converted light of the first color, the second light emitted from the second light source, and the converted light of the second color can be mixed, the light emitting module Expands the range of colors that can be realized.

  Another embodiment of the present invention is also a light emitting module. The light emitting module includes a first light source, a second light source having a light emission characteristic different from that of the first light source, and an optical wavelength conversion unit that converts the wavelength of the first light emitted from the first light source. The second light emitted from the second light source is different in color from the first light.

  According to this aspect, the first light emitted from the first light source, the light obtained by wavelength conversion of the first light by the light wavelength conversion unit, and the second light emitted from the second light source and having a color different from that of the first light. As a result, the range of colors that can be realized by the light emitting module is expanded. The second light source may be arranged to emit the second light toward the emission surface of the light wavelength conversion unit. The second light is reflected by the light exit surface of the light wavelength conversion unit or reflected inside the light wavelength conversion unit. Thereby, since each light is color-mixed by the output surface of a light wavelength conversion part, a uniformity is improved.

  Yet another embodiment of the present invention is also a light emitting module. The light emitting module includes a first light source having a plurality of semiconductor light emitting elements arranged in an array, a second light source having a light emission characteristic different from that of the first light source, and light for converting the wavelength of the first light emitted from the first light source. A wavelength conversion unit, and a rotary reflection unit configured to reflect the second light emitted from the second light source in a desired direction and irradiate a part of the surface of the light wavelength conversion unit with the second light; . The light wavelength conversion unit may convert the wavelength of the second light that is the excitation light.

  According to this aspect, by irradiating a part of the surface of the light wavelength conversion part with the second light emitted from the second light source, the second light is wavelength-converted and the part irradiated with the second light is selected. Can be bright.

  The first light source has a control unit that controls turning on / off of the plurality of semiconductor light emitting elements, and the control unit turns off a part of the plurality of semiconductor light emitting elements, thereby converting the light wavelength. The light-emitting part and the non-light-emitting part may be formed on the surface of the light-emitting part, and the rotary reflection part may be configured to irradiate a region adjacent to the non-light-emitting part of the light-emitting part with the second light. Thereby, the visibility in the area | region corresponding to the boundary of a non-light-emitting part and a light-emitting part can be improved.

  A light emitting module, an optical member that changes an optical path of the laser beam light so that the laser beam light emitted from the laser diode is directed to the surface of the light wavelength conversion unit, and the first light source, the second light source, and the optical member are respectively positioned at predetermined positions. And a support structure that supports the above. The light wavelength conversion unit may be configured integrally with the light emitting diode. Thereby, even if the position of a light emitting module is changed, it is easy to maintain the mutual positional relationship of each light source and an optical member.

  You may further provide the shade which forms the cut line of the light distribution pattern arrange | positioned ahead of the light wavelength conversion part. The optical member may be configured such that the laser beam light irradiates a portion corresponding to the cut line in the light emitting portion of the light wavelength conversion portion. Thereby, the visibility of the cut line of a light distribution pattern can be improved.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, etc. are also effective as an aspect of the present invention.

  According to the present invention, the luminance of the light emitting module can be improved.

It is a schematic sectional drawing of the vehicle lamp which concerns on 1st Embodiment. It is sectional drawing which looked at the principal part of the light emitting module shown in FIG. 1 from upper direction. It is a figure which shows the table | surface which put together the luminance distribution in the light emission surface by lighting conditions. It is a figure which shows the relationship between the irradiation distribution of the light which LD element emits, and the shape of the light emission surface of a light wavelength conversion part. It is a figure which shows the relationship between the irradiation distribution which concerns on the modification of the light which LD element emits, and the shape of the light emission surface of a light wavelength conversion part. 6A is a top view for explaining a light-shielding portion surrounding the light-emitting surface of the light wavelength conversion portion, and FIG. 6B is a cross-sectional view taken along the line BB of the LED package shown in FIG. 6A. . It is a figure which shows schematic structure of the light emitting module which concerns on 2nd Embodiment. It is a figure which shows schematic structure of the light emitting module which concerns on the modification of 2nd Embodiment. It is a figure which shows schematic structure of the light emitting module which concerns on 3rd Embodiment. FIG. 10A is a diagram showing a schematic configuration of the light emitting module according to the fourth embodiment, and FIG. 10B is an example of a light distribution pattern formed by the light emitting module shown in FIG. FIG. FIG. 11A is a diagram showing a schematic configuration of a light emitting module according to the fifth embodiment, and FIG. 11B is an example of a light distribution pattern formed by the light emitting module shown in FIG. FIG. It is a figure which shows schematic structure of the vehicle lamp which concerns on 6th Embodiment. 13A is a front view of the shade seen from the direction of arrow C shown in FIG. 12, and FIG. 13B is a diagram showing an example of a light distribution pattern formed by the vehicle lamp shown in FIG. is there.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate.

[First Embodiment]
(Vehicle lamp)
First, a vehicle lamp will be described as an example of a lamp to which the light emitting module according to the first embodiment is applied. FIG. 1 is a schematic cross-sectional view of the vehicular lamp according to the first embodiment.

  The vehicular lamp 10 includes a lamp body 12, a translucent cover 14, a lamp unit 18 housed in a lamp chamber 16 formed by the lamp body 12 and the translucent cover 14, and a lamp unit in the lamp chamber 16. And a bracket 20 as a support member for supporting 18. The lamp unit 18 is a direct-projection projector-type lamp unit, and includes a light emitting module 22, a projection lens 24, and an extension 26. A heat sink 28 and heat radiating fins 30 are provided on the rear surface of the bracket 20.

  The light emitting module 22 includes an LED package 32 including a plurality of LED (light emitting diode) chips as semiconductor light emitting elements and a light wavelength conversion member, a semiconductor LD (laser diode) element 34 having different light emitting characteristics from the LED chips, and an LD element. And an optical element 36 such as a lens or a reflector for condensing the laser beam light emitted from 34.

  The LED package 32 is placed on the heat sink 28 in a state where its irradiation axis is directed to the front of the vehicle so as to be substantially parallel to the irradiation direction of the lamp unit 18 (left direction in FIG. 1).

  The projection lens 24 is a plano-convex aspherical lens that projects light emitted from the light emitting module 22 forward of the lamp and has a convex front surface and a flat rear surface, and is on an optical axis Ax that extends in the vehicle front-rear direction. Has been placed. An LED chip of the light emitting module 22 is disposed in the vicinity of the rear focal point of the projection lens 24. The light emitted from the light emitting module 22 is directly incident on the projection lens 24. The light incident on the projection lens 24 is collected by the projection lens 24 and irradiated forward as substantially parallel light.

  FIG. 2 is a cross-sectional view of the main part of the light emitting module 22 shown in FIG. 1 as viewed from above. The LED package 32 is mounted so as to face a heat conductive insulating substrate 38 made of ceramics, a plurality of LED chips 40 mounted thereon via solder 39, and an emission surface 40a of the LED chip 40. And the white resin part 44 provided so as to surround the LED chip 40 and the light wavelength conversion part 42.

  The LED chip 40 emits blue light B1 having a wavelength of about 435 to 480 nm, for example. The light wavelength conversion unit 42 contains a phosphor that is excited by light of the wavelength of the blue light B1 and emits yellow light Y1 having a wavelength of about 500 to 595 nm. As the light wavelength conversion unit 42, for example, a Yttrium Aluminum Garnet (YAG) ceramic phosphor or a YAG phosphor powder dispersed in a transparent medium such as glass or silicone resin is used. The white resin portion 44 is for emitting light from the front of the LED package 32 by scattering light emitted from the LED chip 40 and the light wavelength conversion portion 42 to the side. Dispersed in resin.

  The LD element 34 emits blue laser beam B2 having a wavelength of about 435 to 480 nm, for example. The laser beam B2 has higher directivity than the blue light B1 emitted from the LED chip 40, and has a small half width. The emitted laser beam B2 is collected by the optical element 36 and irradiates the surface of the light wavelength conversion unit 42 of the LED package 32. As a result, the light wavelength conversion unit 42 is also excited by the blue laser beam B2 and emits Lambertian yellow light Y2.

  As described above, the light emitting module 22 according to the first embodiment includes the plurality of LED chips 40 as the first light source, the LD element 34 as the second light source having a light emission characteristic different from that of the LED chip 40, and the LED chip 40. And a light wavelength conversion unit 42 that converts the wavelength of the blue light emitted by the LD element 34 and the blue light emitted by the LD element 34.

  As a result, the light emitted from the LED chip 40 and the LD element 34 arranged at different positions is wavelength-converted by the light wavelength converter 42, so that the light emitted from one light source is wavelength-converted by the light wavelength converter 42. Compared with the case where it does, the brightness | luminance of the light emitting module 22 can be raised.

  FIG. 3 is a diagram showing a table summarizing the luminance distribution in the light-emitting surface according to the lighting conditions. The luminance distribution was measured by an existing luminance meter 46 disposed at a position facing the light emitting surface 42a of the light wavelength conversion unit 42 of the LED package 32 as shown in FIG. As shown in FIG. 3, when only the LED chip 40 of the LED package 32 is turned on, the entire light emitting surface 42a has substantially uniform luminance. On the other hand, when only the LD element 34 is turned on, the laser beam light of the LD element 34 has higher directivity than the light emission of the LED chip 40, and thus the luminance at the center of the light emitting surface 42a is particularly high.

  Therefore, when both the LED chip 40 and the LD element 34 are turned on, the luminance of the central portion of the light emitting surface 42a can be improved as compared with the case where only the LED package 32 is turned on. Thus, by using together the LD element 34 having higher directivity than the LED chip 40, it is possible to increase the luminance of part of the light emitting surface 42a.

  The LED chip 40 according to the first embodiment is configured to irradiate the blue light B1 from the rear surface side of the light wavelength conversion unit 42, and the LD element 34 includes the light wavelength conversion unit 42. The laser beam light B2 is irradiated from the front surface side. Thereby, since the LED package 32 and the LD element 34 can be arranged without interfering with light emitted from other light sources, the degree of freedom of arrangement of the LED package 32 and the LD element 34 is increased.

  In the light emitting module 22, the LED chip 40 is disposed in the vicinity of the light wavelength conversion unit 42, and the LD element 34 is disposed at a position separated from the light wavelength conversion unit 42. Since the light emitted from the LD element 34 has high directivity and the spread of the light is suppressed by the optical element 36, most of the light can be provided even if it is provided at a position separated from the light wavelength conversion unit 42. 42 reaches the light emitting surface 42a. Therefore, the light utilization efficiency can be increased.

  FIG. 4 is a diagram showing the relationship between the irradiation distribution of light emitted from the LD element 34 and the shape of the light emitting surface 42 a of the light wavelength conversion unit 42. In FIG. 4, for convenience of explanation, the irradiation distribution 48 and the light emitting surface 42 a are illustrated apart from each other, but actually overlap.

  In the light wavelength conversion unit 42, the longitudinal direction (X direction shown in FIG. 4) of the light emitting surface 42a irradiated with the laser beam emitted from the LD element 34 is the longitudinal direction of the irradiation distribution (spot shape) 48 of the laser beam ( It is arrange | positioned along the (X direction shown in FIG. 4). Thereby, the laser beam light can be efficiently used as the excitation light of the optical wavelength conversion unit 42.

  FIG. 5 is a diagram showing the relationship between the irradiation distribution and the shape of the light emitting surface 42 a of the light wavelength conversion unit 42 according to a modification of the light emitted from the LD element 34. In FIG. 5, for convenience of explanation, the irradiation distribution 50 and the light emitting surface 42 a are illustrated apart from each other, but actually overlap.

  In the light wavelength conversion unit 42, the short direction (Y direction shown in FIG. 5) of the light emitting surface 42a irradiated with the laser beam emitted from the LD element 34 is the longitudinal direction of the irradiation distribution (spot shape) 50 of the laser beam. The width W2 in the longitudinal direction of the spot shape of the laser beam light is arranged from the width W1 in the short direction of the light emitting surface 42a irradiated with the laser beam light, which is arranged along the (Y direction shown in FIG. 5). Is configured to be narrow. Thereby, the brightness | luminance of the center part of the optical wavelength conversion part 42 can be raised. Note that the region of the light wavelength conversion unit 42 irradiated with the laser beam emitted from the LD element 34 may be the center of the light emitting surface 42a, or may be an end region outside the center.

  Therefore, the light emitting module having such a configuration is more suitable for a high beam vehicle lamp. In a high beam vehicular lamp, by increasing the luminance of the central portion of the light emitting surface 42a projected as a high beam light distribution pattern, a farther distance can be irradiated with a sufficient amount of light.

  Further, the light emitting module 22 according to the first embodiment is arranged in a direction in which the laser beam emitted from the LD element 34 is regularly reflected on the surface of the light wavelength conversion unit 42, as shown in FIGS. A light shielding part 52 is provided. Thereby, it can suppress that the laser beam light (B2) specularly reflected by the light emission surface 42a of the light wavelength conversion part 42 is emitted outside the module.

  6A is a top view for explaining a light shielding portion surrounding the light emitting surface 42a of the light wavelength conversion portion 42, and FIG. 6B is a cross-sectional view taken along the line BB of the LED package 32 shown in FIG. 6A. FIG.

  The LED package 32 includes a light shielding frame 54 that surrounds a light emitting surface 42a opposite to the incident surface 42b of the light wavelength conversion unit 42 on which light emitted from the LED chip 40 is incident. The light shielding frame 54 has a rectangular opening 54a similar to the light emitting surface 42a at the center. Thereby, the irradiation area | region according to the shape of the light emission surface 42a or the opening part 54a is realizable with sufficient precision.

[Second Embodiment]
FIG. 7 is a diagram illustrating a schematic configuration of a light emitting module according to the second embodiment. The light emitting module 60 includes an LED chip 62 as a first light source, a light wavelength conversion unit 64, and an LD element 66 as a second light source.

  The light wavelength converter 64 is excited by the first light L1 (blue light or violet light) emitted from the LED chip 62 and emits yellow light as the first color converted light, and the LD element 66. The second phosphor 64b that emits red light as the second color converted light, and the first phosphor 64a and the second phosphor 64b are dispersed by being excited by the second light L2 (blue light or violet light) emitted from Transparent matrix phase 64c.

The first phosphor 64a is, for example, yellow phosphor particles such as YAG. Alternatively, the general formula is (M ² _x , M ³ _y , M ⁴ _z ) _m M ¹ O ₃ X _{(2 / n)} (where M ¹ is selected from the group consisting of Si, Ge, Ti, Zr and Sn) One or more elements including at least Si, M ² is one or more elements including at least Ca selected from the group consisting of Ca, Mg, Ba and Zn, and M ³ is a group consisting of Sr, Mg, Ba and Zn one or more elements including at least Sr are more selected, X is represents one or more elements including at least Eu ²⁺ at least one halogen element, M ⁴ is selected from the group consisting of rare earth elements and Mn. Further, m is in a range of 0.11 ≦ m ≦ 8/6 and n is in a range of 5 ≦ n ≦ 7, and x, y, and z are x + y + z = 1, 0 <x <1, 0 <y <1, 0 In a range satisfying .01 ≦ z ≦ 0.3.) It is a child.

The second phosphor 64b is, for example,
(I) (Ca _1-x , Sr _x ) AlSiN ₃ : Eu ²⁺ (0 ≦ x <0.4)
(Ii) (Ca, Sr) ₂ Si ₅ N ₈ : Eu ²⁺
(Iii) (Ca, Sr, Ba) ₃ SiO ₅ : Eu ²⁺
The red phosphor particles represented by the composition formula The matrix phase 64c is made of, for example, a transparent resin material or an inorganic material (glass or ceramics), and preferably has a transmittance of 50% or more for the total luminous flux of visible light.

  Thus, by selecting the first phosphor 64a and the second phosphor 64b according to the characteristics of the LED chip 62 and the LD element 66, the degree of freedom of the combination of the LED chip 62 and the LD element 66 having different emission characteristics is high. Become. Further, the LD element 66 emits the first light L1 emitted from the LED chip 62, the first color converted light L1 ′ (yellow light) emitted from the first phosphor 64a excited by the first light L1. Since the second light L2 (blue light or violet light) and the second color converted light L2 ′ (red light) emitted by the second phosphor 64b excited by the second light L2 can be mixed, The range of colors that can be realized by the light emitting module is expanded, and the color rendering is improved.

  FIG. 8 is a diagram illustrating a schematic configuration of a light emitting module according to a modification of the second embodiment. The light emitting module 70 shown in FIG. 8 is different from the light emitting module 60 described above in that it includes an LD element 68 as a third light source having a light emission characteristic different from that of the LED chip 62. The light wavelength conversion unit 64 includes a third phosphor 64d that is excited by the third light (blue light or violet light) emitted from the LD element 68 and emits green light as the third color change light. Other configurations of the light emitting module 70 are substantially the same as those of the light emitting module 60.

The third phosphor 64d is, for example,
(I) (Ba, Sr, Ca) ₂ SiO ₄ : Eu ²⁺
(Ii) (Ba, Sr) ₂ SiO ₄ : Eu ²⁺
(Iii) Sr ₂ SiO ₄ : Eu ²⁺
(Iv) Eu-activated β sialon (v) Ba ₃ Si ₆ O ₁₂ N ₂ : Eu ²⁺
(Vi) SrGa ₂ S ₄ : Eu ²⁺
(Vii) SrSi ₂ O ₂ N ₂ : Eu ²⁺
(Viii) (Ba, Sr) Si ₂ O ₂ N ₂ : Eu ²⁺
(Ix) SrAlO ₄ : Eu ²⁺
(X) (Sr, Ba) Al ₂ Si ₂ O ₈ : Eu ²⁺
(Xi) (Ba, Sr, Ca) ₂ (Mg, Zn) Si ₂ O ₇ : Eu ²⁺
_{(Xii) Sr 2 Si 3 O} 8 -2SrCl 2: Eu 2+
The green phosphor particles represented by the composition formula

  In addition to the above-described phosphors, or in place of some phosphors, an orange phosphor or another color phosphor may be used. The orange phosphor emits light having an emission spectrum peak wavelength in the range of 590 nm to 620 nm.

  Accordingly, the LED chip 62 and the LD element having different light emission characteristics are selected by selecting the first phosphor 64a, the second phosphor 64b, and the third phosphor 64d according to the characteristics of the LED chip 62 and the LD elements 66 and 68. The degree of freedom of the combination of 66 and 68 increases. Further, the LD element 66 emits the first light L1 emitted from the LED chip 62, the first color converted light L1 ′ (yellow light) emitted from the first phosphor 64a excited by the first light L1. The LD element 68 emits the second light L2 (blue light or violet light), the second color converted light L2 ′ (red light) emitted from the second phosphor 64b excited by the second light L2. Since the third color conversion light L3 ′ (green light) that is excited by the third light L3 (blue light or violet light) and emitted from the third phosphor 64d can be mixed, the range of colors that the light emitting module can realize can be expanded. , Color rendering is improved. In addition, the luminance and luminous flux can be improved by adding green light with high visibility.

  Further, in the light wavelength converter 64, the first phosphor 64a is unevenly distributed on the side where the first light L1 emitted from the LED chip 62 is incident, and the second phosphor 64b and the third phosphor 64d are connected to the LD element 66, The light L2 and L3 emitted by 66 may be unevenly distributed on the incident side. Thereby, since the amount of phosphors to be included can be suppressed without reducing the converted light generated by the optical wavelength converter 64, the transmittance of the optical wavelength converter 64 itself is also improved.

[Third Embodiment]
In the light wavelength converter 64 according to the second embodiment, a plurality of types of phosphors are mixed in a transparent matrix phase. However, when the light wavelength conversion part is made of a material that is uniform throughout, such as a ceramic phosphor, it is difficult to incorporate other types of phosphors into the light wavelength conversion part. Therefore, in the light emitting module according to the third embodiment, light emitted from the second light source is used as reflected light.

FIG. 9 is a diagram illustrating a schematic configuration of a light emitting module according to the third embodiment. The light emitting module 72 includes an LED chip 62, a light wavelength conversion unit 74, and an LD element 76. The LED chip 62 is provided such that the emission surface faces the one surface 74 a of the light wavelength conversion unit 74, and emits the first light L <b> 1 toward the light wavelength conversion unit 74. The light wavelength conversion unit 74 is a ceramic phosphor made entirely of a uniform material. Examples of the ceramic phosphor include YAG and yttrium oxide (Y ₂ O ₃ ). The light wavelength conversion unit 74 made of such a ceramic phosphor absorbs part of the blue light (L1) emitted from the LED chip 62 and emits the wavelength-converted yellow light (L1 ′).

  The LD element 76 is disposed on the other surface 74 b side of the light wavelength conversion unit 74. The light L <b> 2 emitted from the LD element 76 is reflected on the other surface 74 b of the light wavelength conversion unit 74 or is reflected inside the light wavelength conversion unit 74. The light L2 emitted from the LD element 76 is light other than the blue light emitted from the LED chip 62 and the yellow light emitted from the light wavelength conversion unit 74, for example, red light, green light, orange light, and the like.

  Accordingly, the first light L1 (blue light) emitted from the LED chip 62, the light L1 ′ (yellow light) obtained by converting the wavelength of the first light L1 by the light wavelength conversion unit 74, and the LD element 76 emits the first light. Since the first light L1 and the second light L2 (for example, red light) having a different color can be mixed, the color range that can be realized by the light emitting module 72 is expanded. The LD element 76 is disposed so as to emit the second light L2 toward the other surface 74b (exit surface) of the light wavelength conversion unit 74. The second light L <b> 2 is reflected by the other surface 74 b of the light wavelength conversion unit 74 or is reflected inside the light wavelength conversion unit 74. Thereby, since each light is mixed in the vicinity of the emission surface of the light wavelength conversion unit 74, the uniformity is improved. A plurality of LD elements having different colors of emitted light may be arranged.

[Fourth Embodiment]
FIG. 10A is a diagram showing a schematic configuration of the light emitting module according to the fourth embodiment, and FIG. 10B is an example of a light distribution pattern formed by the light emitting module shown in FIG. FIG.

  The light emitting module 78 shown in FIG. 10A includes a plurality of LED modules 82a to 82g arranged in an array on a substrate 80, an LD element 84, and an emission surface of each LED module 82 that emits light emitted from the LD element 84. And a movable mirror 86 that reflects toward the screen. Each of the LED modules 82a to 82g includes an LED chip that emits blue light and violet light (L1), and a light wavelength conversion unit that emits yellow light (L1 ′) by converting the wavelength of blue light and violet light that are excitation light. Have.

  The movable mirror 86 rotates left and right around a rotation axis perpendicular to the paper surface of FIG. 10A, and can reflect the light emitted from the LD element 84 in a desired direction. Thereby, the blue light and violet light (L2) emitted from the LD element 84 irradiate (scan) the surfaces of the light wavelength conversion units provided on the emission surface sides of the plurality of LED modules 82a to 82g, respectively. Is wavelength-converted and emitted as yellow light (L1 ′). Thereby, it is possible to form a light distribution pattern PH for a high beam that is brighter than a light emitting module including only the LED modules 82a to 82g.

  As shown in FIG. 10B, the light emitting module 78 is configured to form a high beam light distribution pattern PH. The high beam light distribution pattern PH is a combination of patterns P1 to P7 corresponding to the seven LED modules 82a to 82g shown in FIG.

  The light emitting module 78 may control the lighting timing of the LD element 84 so that the light L2 scans only the emission surface of the middle LED module 82d among the seven LED modules. Thereby, the central area (far area) of the high beam light distribution pattern PH can be illuminated more brightly.

[Fifth Embodiment]
FIG. 11A is a diagram showing a schematic configuration of a light emitting module according to the fifth embodiment, and FIG. 11B is an example of a light distribution pattern formed by the light emitting module shown in FIG. FIG.

  In addition to the configuration of the light emitting module 78 according to the fourth embodiment, the light emitting module 88 shown in FIG. 11A includes an LD element 90 and the light emitting surfaces of the LED modules 82a to 82g that emit light emitted from the LD element 90. And a control unit 94 that controls turning on / off of each of the LED modules 82a to 82g.

  The control unit 94 turns off some of the LED modules 82a to 82g to form a light emitting unit and a non-light emitting unit on the surface of the light wavelength conversion unit corresponding to each module. As shown in FIG. 11B, the light emitting module 88 is configured to form a partial high beam light distribution pattern PH ′ that is partially unirradiated. Specifically, by turning off the second LED module 82b from the left among the seven LED modules, the region corresponding to the pattern P2 is a non-irradiation region. In a state where such a partial high beam light distribution pattern PH ′ is formed in front of the vehicle, for example, when a person comes out from behind a parked vehicle existing in a non-irradiated area, the driver is difficult to recognize. .

  Therefore, the second light L2 is wavelength-converted by irradiating a part of the surface of the light wavelength conversion part of the LED module with the second light L2 emitted from the LD element 84 or the LD element 90, and the second light L2 The part irradiated with can be selectively brightened. More specifically, the light emitted from the LD element 84 is reflected by the movable mirror 86, and the end of the LED module 82a on the side adjacent to the LED module 82b is irradiated. Further, the light emitted from the LD element 90 is reflected by the movable mirror 92, and the end of the LED module 82c on the side adjacent to the LED module 82b is irradiated. Thereby, the light emitting module 88 can irradiate brightly the boundary portions on both sides (pattern P1 and pattern P3) of the non-irradiation region R1 of the partial high beam light distribution pattern PH '. Therefore, the visibility in the area | region corresponding to the boundary of a non-light-emitting part and a light-emitting part can be improved, and when a person comes out from the shade of a vehicle as mentioned above, it becomes easy to discover.

[Sixth Embodiment]
FIG. 12 is a diagram showing a schematic configuration of the vehicular lamp according to the sixth embodiment. 13A is a front view of the shade seen from the direction of arrow C shown in FIG. 12, and FIG. 13B is a diagram showing an example of a light distribution pattern formed by the vehicle lamp shown in FIG. is there.

  A vehicular lamp 100 shown in FIG. 12 is used as a vehicular headlamp. The vehicular lamp 100 includes a light emitting module 102, a reflector 104, and a projection lens 105. The light emitting module 102 includes an LED chip 106 that is a first light source, an LD element 108 that is a second light source, and a shade 110. The LED chip 106 has a light wavelength conversion unit integrally formed with a light emitting diode.

  The reflector 104 functions as an optical member that changes the optical path of the laser beam so that the laser beam (L2) emitted from the LD element 108 is directed to the surface of the light wavelength conversion unit of the LED chip 106. The support structure 112 includes a support substrate 114 that supports the LED chip 106, the LD element 108, and the reflector 104 at predetermined positions. The support substrate 114 has an optical axis adjusting screw 116 connected to the upper part thereof, and a pivot mechanism 118 provided to the lower part thereof. Thereby, even if the position of the light emitting module 102 is changed, it is easy to maintain the mutual positional relationship of the LED chip 106, the LD element 108, and the reflector 104.

  Next, the shade 110 according to the present embodiment will be described. As shown in FIG. 13A, the shade 110 is disposed in front of the light wavelength conversion unit 106a of the LED chip 106, and forms a cut line of the light distribution pattern. Further, the shade 110 partially overlaps the light wavelength conversion unit 106a when viewed from the front side of the vehicle. Further, the shade 110 has a step portion 110a for forming a cut line for forming a cut line of the light distribution pattern. Thereby, the vehicular lamp 100 can form the low beam light distribution pattern PL shown in FIG. The low beam light distribution pattern PL is formed with cut lines CL1 and CL2 having a step at the upper end.

  The reflector 104 is configured so that the laser beam light irradiates the region R3 corresponding to the cut line in the light emitting unit of the light wavelength conversion unit 106a. Thereby, as shown in FIG.13 (b), the visibility of the cut lines CL1 and CL2 of the light distribution pattern PL for low beams can be improved.

[Other variations]
In each of the above-described embodiments, an LED chip or an LD element that is a light source may be disposed via an optical fiber. As a result, the degree of freedom in layout of the LED chip and the LD element is increased, and thus a member such as a heat sink necessary for cooling the LED chip and the LD element can be arranged in an empty space in the vehicular lamp. As a result, the vehicle lamp can be reduced in size.

  As described above, the present invention has been described with reference to the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and the configurations of the embodiments are appropriately combined or replaced. Those are also included in the present invention. Further, it is possible to appropriately change the combination and processing order in each embodiment based on the knowledge of those skilled in the art and to add various modifications such as various design changes to each embodiment. Embodiments to which is added can also be included in the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 Vehicle lamp, 18 Lamp unit, 22 Light emitting module, 24 Projection lens, 32 LED package, 34 LD element, 36 Optical element, 40 LED chip, 40a Output surface, 42 Light wavelength conversion part, 42a Light emission surface, 42b Incident surface 44 White resin part, 48, 50 Irradiation distribution, 52 Light shielding part, 54 Light shielding frame.

Claims (14)

A first light source;
A second light source having a light emission characteristic different from that of the first light source;
An optical wavelength converter that converts the wavelength of the first light emitted from the first light source and the second light emitted from the second light source;
A light emitting module comprising:   The light emitting module according to claim 1, wherein the directivity of the first light source is different from the directivity of the second light source. The first light source is configured to irradiate the first light from one surface side of the light wavelength conversion unit,
The second light source is configured to irradiate the second light from the other surface side of the light wavelength conversion unit,
The light emitting module according to claim 1, wherein the light emitting module is a light emitting module. The first light source includes a light emitting diode disposed in the vicinity of the light wavelength conversion unit,
4. The light emitting module according to claim 1, wherein the second light source includes a laser diode that is disposed farther from the light wavelength conversion unit than the first light source. 5.   The optical wavelength conversion unit is arranged such that a longitudinal direction of a surface irradiated with a laser beam emitted from the laser diode is along a longitudinal direction of a spot shape of the laser beam. 5. The light emitting module according to 4. The optical wavelength converter is
The short direction of the surface irradiated with the laser beam light emitted from the laser diode is arranged along the longitudinal direction of the spot shape of the laser beam light, and
The light emission according to claim 4, wherein the width in the longitudinal direction of the spot shape of the laser beam light is narrower than the width in the short direction of the surface irradiated with the laser beam light. module.   7. The light emitting module according to claim 4, further comprising a light shielding portion surrounding a light emitting surface opposite to a surface of the light wavelength conversion portion on which light emitted from the light emitting diode is incident.   8. The light emitting module according to claim 4, further comprising: a light shielding unit disposed in a direction in which laser beam light emitted from the laser diode is regularly reflected on a surface of the light wavelength conversion unit.   The light wavelength converter is excited by the first light emitted from the first light source and excited by the second phosphor emitted from the first phosphor and the second light source emitted from the first light source. The light emitting module according to claim 1, further comprising a second phosphor that emits converted light of a second color. A first light source;
A second light source having a light emission characteristic different from that of the first light source;
An optical wavelength converter that converts the wavelength of the first light emitted from the first light source,
The light-emitting module, wherein the second light emitted from the second light source is different in color from the first light. A first light source having a plurality of semiconductor light emitting elements arranged in an array;
A second light source having a light emission characteristic different from that of the first light source;
An optical wavelength converter that converts the wavelength of the first light emitted from the first light source;
A rotary reflection unit configured to reflect the second light emitted from the second light source in a desired direction and irradiate a part of the surface of the light wavelength conversion unit with the second light;
A light emitting module comprising: The first light source has a control unit that controls turning on and off of the plurality of semiconductor light emitting elements,
The control unit forms a light emitting unit and a non-light emitting unit on the surface of the light wavelength conversion unit by turning off some of the semiconductor light emitting devices among the plurality of semiconductor light emitting devices.
The light emitting module according to claim 11, wherein the rotation reflection unit is configured to irradiate a region adjacent to the non-light emitting unit of the light emitting unit with the second light. The light emitting module according to any one of claims 4 to 8,
An optical member that changes the optical path of the laser beam light so that the laser beam light emitted from the laser diode is directed toward the surface of the light wavelength conversion unit;
A support structure for supporting each of the first light source, the second light source, and the optical member at predetermined positions;
The vehicular headlamp, wherein the light wavelength conversion unit is configured integrally with the light emitting diode. Further comprising a shade disposed in front of the light wavelength conversion unit to form a cut line of a light distribution pattern;
14. The vehicle front according to claim 13, wherein the optical member is configured so that the laser beam light irradiates a portion corresponding to the cut line in a light emitting unit of the light wavelength conversion unit. Lighting.

Images