JP6044833B2 - Light emitting device and vehicle lamp - Google Patents

Description

  The present invention relates to a light emitting device and a vehicle lamp, and more particularly, to a light emitting device having a structure in which a laser element and a wavelength conversion member are combined, and a vehicle lamp using the same.

  Conventionally, a light emitting device having a structure in which a laser element and a wavelength conversion member are combined has been proposed (see, for example, Patent Document 1).

  FIG. 13 is a cross-sectional view of the light emitting device 200 described in Patent Document 1.

  As shown in FIG. 13, the light emitting device 200 described in Patent Document 1 passes through a cap 210, a plate-like wavelength conversion member 220 disposed on the through hole H formed in the cap 210, and the through hole H, A laser element 230 that emits laser light for irradiating the wavelength conversion member 220, a pedestal 240 to which a cap 210, the laser element 230, and the like are fixed are provided.

JP 2011-14587 A

  The light emitting device 200 having the above configuration has the following problems.

  14 (a) to 14 (c) are diagrams for explaining problems in the light emitting device 200 having the above-described configuration. FIG. 14 (a) is a diagram of the wavelength conversion member 220 in the upper portion 220A immediately above the through hole H. FIG. 14B shows a state in which the crack C is induced, FIG. 14B shows a state in which the crack C progresses, and FIG. 14C shows the laser light Ray1 from the laser element 230 without wavelength conversion. It is a figure showing a mode that it passes through the crack C and is irradiated outside.

  As shown in FIG. 14A, when some external force F is applied to the wavelength conversion member 220, a crack C is induced in the upper portion 220A of the wavelength conversion member 220 (see FIG. 14A), and then the external force F As shown in FIG. 14B, the crack C is caused by internal stress (and / or thermal stress generated by continuous irradiation of laser light from the laser element 230) generated by continuing to be applied. May progress in the thickness direction of the wavelength conversion member 220 and penetrate the lower surface 222 and the upper surface 224 in the upper portion 220A of the wavelength conversion member 220.

  When the crack C penetrates the lower surface 222 and the upper surface 224 in the upper portion 220A of the wavelength conversion member 220, the laser light Ray1 from the laser element 230 is not wavelength-converted as shown in FIG. This causes a problem of passing through the crack C and irradiating the outside. In FIG. 14C, the symbol Ray1 represents the laser beam from the laser element 230, and the symbol Ray2 represents the light emission after wavelength conversion.

  The present invention has been made in view of such circumstances, and by controlling the location where a crack is induced and the direction in which the induced crack propagates (that is, generating the crack at a location where the crack is aimed), An object of the present invention is to provide a light emitting device capable of preventing laser light from the element from being irradiated outside through the crack without being wavelength-converted, and a vehicle lamp using the light emitting device.

  In order to achieve the above-mentioned object, the invention described in claim 1 passes through the through hole, a base portion including a front surface, a back surface opposite to the front surface, and a through hole penetrating the front surface and the back surface. A wavelength conversion member that absorbs at least part of the laser light emitted and emits light of a different wavelength, and covers the through hole and is fixed to the surface with a partial region exposed from the through hole A wavelength conversion member that includes a first surface and a second surface opposite to the first surface and that can generate a crack penetrating between the first surface and the second surface; And a laser element that emits a laser beam that irradiates a part of the first surface exposed from the through hole, and the wavelength conversion member has the crack that converts the wavelength. Do not occur directly above the through hole of the member The crack inducing portion for controlling the induction portion and its development direction of the crack, including a portion other than the straight upper.

  According to the first aspect of the present invention, when some external force is applied to the wavelength conversion member, a crack is prevented from occurring immediately above the through hole in the wavelength conversion member due to the action of the crack inducing portion (that is, The crack is induced and the direction in which the crack is induced is controlled so that a crack does not occur in a state of penetrating a region of the first surface immediately above the through hole and a region of the second surface immediately above the through hole). It becomes possible. That is, it is possible to generate a crack at a location aimed at. As a result, the laser light from the laser element can be prevented from being irradiated to the outside through the crack without undergoing wavelength conversion.

  The invention according to claim 2 is the invention according to claim 1, wherein the crack inducing portion is a region other than the region directly above the through hole in the first surface and the through-hole in the second surface. It is formed in at least one or both of the regions other than the region directly above the hole.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the crack inducing portion is a recess extending in a direction perpendicular to the thickness direction of the wavelength conversion member.

  According to the third aspect of the present invention, the crack propagation direction can be controlled by adjusting the shape, location, number, etc. of the recesses.

  According to a fourth aspect of the present invention, in the invention of the third aspect, the crack inducing portion has a cross section when the cross section is cut by a plane orthogonal to the direction in which the crack inducing portion extends, and the vertex is the wavelength conversion. It is a triangular prism-shaped recess that is located inside the member and has a triangular shape with a base located closer to the first surface or the second surface than the apex.

  According to the fourth aspect of the present invention, the crack propagation direction can be controlled by adjusting the position of the apex of the triangular shape (cross section) constituting the recess.

  The invention according to claim 5 is the invention according to claim 4, wherein the apex of the triangular shape is on a straight line passing through the center of the base of the triangular shape and extending in the thickness direction, or with respect to the straight line, The first surface is located on the side opposite to the side where the region immediately above the through hole is located.

  According to the fifth aspect of the present invention, the crack propagation direction can be controlled by adjusting the position of the apex of the triangular shape (cross section) constituting the recess.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the thickness of the wavelength conversion member immediately above the through hole is other than the portion directly above the wavelength conversion member. It is relatively thicker than the part.

  According to the sixth aspect of the present invention, the portion directly above the through hole of the wavelength conversion member can be made harder to crack than the other portions.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the crack inducing portion is a region of the first surface other than a region directly above the through hole and of the second surface. It forms in the mutually opposing location of each area | region other than the area | region immediately above the said through-hole.

  According to the seventh aspect of the present invention, the crack inducing portion is placed in either one of the first surface other than the region immediately above the through hole or the second surface other than the region immediately above the through hole. Compared with the case where it forms, a crack can be generated more accurately at a target location.

  This invention can also be specified as follows as invention of a vehicle lamp.

  A vehicle lamp comprising: the light-emitting device according to any one of claims 1 to 7; and an optical system configured to control light from the light-emitting device to irradiate the front of the vehicle.

  According to the present invention, the laser beam from the laser element is not wavelength-converted by controlling the crack-inducing point and the direction in which the induced crack propagates (that is, the crack is generated at the target point). It is possible to provide a light emitting device capable of preventing the light from passing through the crack and being irradiated to the outside, and a vehicular lamp using the light emitting device.

It is a longitudinal cross-sectional view of the light-emitting device 10 which is one Embodiment of this invention. 2A is an enlarged cross-sectional view of the vicinity of a base portion 22 of the cap 12, and FIG. 2B is a top view of the wavelength conversion member 14. FIG. (A) The figure showing a mode that the crack C is induced from the crack induction part 32, (b) The figure showing the mode that the crack C progresses, (c) The laser beam Ray1 from the laser element 16 is said crack C. It is a figure showing a mode that wavelength conversion is carried out outside without passing. (A) The modification of the crack induction part 32 (modification), (b) It is a figure showing a mode that the crack C induced from the crack induction part 32 (modification) progresses. (A) The modification of the crack induction part 32 (modification), (b) It is a figure showing a mode that the crack C induced from the crack induction part 32 (modification) progresses. (A) The modification of the crack induction part 32 (modification), (b) It is a figure showing a mode that the crack C induced from the crack induction part 32 (modification) progresses. (A) The modification of the crack induction part 32 (modification), (b) It is a figure showing a mode that the crack C induced from the crack induction part 32 (modification) progresses. It is a modification of the crack induction part 32 (modification). It is an example of the light-emitting device 10 (modification example) using the condensing lens. It is an example of the light-emitting device 10 (modification example) using the light guide. Configuration of a so-called direct projection type (also referred to as a direct projection type) vehicular lamp 50 that includes a projection lens 52 as an optical system configured to control light from the light emitting device 10 and irradiate the front of the vehicle. It is an example. In a configuration example of a so-called projector-type vehicle lamp 60 that includes a reflecting surface 62, a shade 64, and a projection lens 66 as an optical system configured to control light from the light emitting device 10 and irradiate the front of the vehicle. is there. 2 is a cross-sectional view of a light emitting device 200 described in Patent Literature 1. FIG. (A) The figure which shows a mode that the crack C is induced in 220A of the wavelength conversion member 220 right above the through-hole H, (b) The figure showing a mode that the crack C progresses, (c) From the laser element 230 It is a figure showing a mode that laser beam Ray1 passes the said crack C, and is irradiated outside, without carrying out wavelength conversion.

  Hereinafter, a light emitting device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a light emitting device 10 according to an embodiment of the present invention.

  As shown in FIG. 1, the light-emitting device 10 includes a cap 12, a wavelength conversion member 14, a laser element 16, a pedestal 18, and the like.

  The cap 12 is made of a metal such as stainless steel, and includes a cylindrical tube portion 20 and a circular base portion 22 that closes an upper opening end thereof. The cap 12 is fixed to the pedestal 18 at the lower end of the cylindrical portion 20.

  FIG. 2A is an enlarged sectional view of the vicinity of the base portion 22 of the cap 12.

  As shown in FIG. 2A, the base portion 22 has a through hole H that penetrates the front surface 26 including the recess 24, the back surface 28 on the opposite side, the front surface 26 (the bottom surface 24 a of the recess 24), and the back surface 28. And.

  The wavelength conversion member 14 is a wavelength conversion member that absorbs at least part of the laser light irradiated through the through hole H and emits light of different wavelengths, covers the through hole H, and extends from the through hole H. The lower surface 14a (corresponding to the first surface of the present invention) fixed to the surface 26 of the base portion 22 (the bottom surface 24a of the recess 24) with the partial region 14a1 exposed, and the upper surface 14b on the opposite side (corresponding to the present invention) Equivalent to the second surface).

  FIG. 2B is a top view of the wavelength conversion member 14.

The wavelength conversion member 14 is, for example, a composite (for example, a sintered body) of YAG and alumina Al ₂ O ₃ into which an activator such as cerium Ce is introduced. FIG. 2A and FIG. ), The outer shape is rectangular and is formed into a plate shape or a layer shape (for example, a rectangle of 0.4 mm × 0.8 mm and a thickness of 80 μm) including a lower surface 14a and an upper surface 14b arranged substantially parallel to each other. Can be used.

  The wavelength conversion member 14 has a lower surface 14 a (excluding the region 14 a 1 exposed from the through hole H) and a surface 26 of the base portion 22 (a bottom surface 24 a of the recess 24) bonded with, for example, a silicon-based adhesive 30. , Held in the recess 24.

  The material of the wavelength conversion member 14 is not limited to the above, and may be, for example, a composite (for example, a sintered body) of YAG and a glass binder into which an activator such as cerium Ce is introduced, or other materials. May be used. The thickness of the wavelength conversion member 14 may be substantially uniform over the entire region, or may be partially different. The lower surface 14a and the upper surface 14b of the wavelength conversion member 14 may be a flat surface, a curved surface, or a surface including irregularities and / or a curved surface. The outer shape of the lower surface 14a and the upper surface 14b of the wavelength conversion member 14 may be a circle, an ellipse, or other shapes other than a rectangle.

  The laser element 16 is a laser element that emits a laser beam that passes through the through hole H and irradiates a partial region 14 a 1 exposed from the through hole H in the lower surface 14 a of the wavelength conversion member 14.

  As the laser element 16, for example, a semiconductor laser element such as a laser diode (LD) having an emission wavelength of blue (about 450 nm) can be used.

  For example, as shown in FIG. 1, the laser element 16 is fixed to an element base 18 a (for example, a side surface) that extends upward from the upper surface of the base 18 with the light emitting portion 16 a and the through hole H facing each other. , Is disposed almost directly below the through hole H. The laser element 16 is electrically connected to the electrode 34 held on the pedestal 18 via a wire (not shown) or the like.

  The emission wavelength of the laser element 16 is not limited to blue (about 450 nm), and may be, for example, the near ultraviolet region (about 405 nm) or other wavelengths. When the emission wavelength of the laser element 16 is in the near ultraviolet region (about 405 nm), the wavelength conversion member 14 is a phosphor of three colors of blue, green and red, or a phosphor of two colors of blue and yellow.

  As shown in FIGS. 2A and 2B, the wavelength conversion member 14 includes a crack inducing portion 32.

  The crack inducing portion 32 is configured so that cracks do not occur in the upper portion 14A immediately above the through hole H of the wavelength conversion member 14, that is, the lower surface 14a of the wavelength conversion member 14 directly above the lower surface 14a1 directly above the through hole H. This is for controlling the location where the crack is induced and the direction in which the crack is induced so that it does not occur in a state where it penetrates the region 14b1 directly above the through hole H in the upper surface 14b of the wavelength conversion member 14.

  As the crack inducing portion 32, for example, a recess extending in a direction orthogonal to the thickness direction of the wavelength conversion member 14 (see FIG. 2B), specifically, a plane orthogonal to the direction in which the recess extends. As shown in FIG. 2A, the cross-section when cut is a triangle in which the vertex V is located inside the wavelength conversion member 14 and the base B is located on the upper surface 14b side (or lower surface 14a side) from the vertex V. A triangular prism-shaped concave portion can be used. The apex V of the triangular shape (cross section) is located on a straight line L that passes through the center (or substantially the center) of the base B of the triangular shape (cross section) and extends in the thickness direction.

  The triangular prism-shaped concave portion (the crack inducing portion 32) can be formed by, for example, scratching, dicing or laser irradiation on the upper surface 14b (and / or the lower surface 14a) of the wavelength conversion member 14. Or it can also form by shape | molding the wavelength conversion member 14 using the metal mold | die containing the convex part corresponding to the concave part (crack induction part 32) of a triangular prism shape.

  The crack inducing part 32 may extend linearly or may extend in a curved line. Moreover, you may extend continuously and you may extend in dotted line form. From the viewpoint of ease of formation, it is desirable that the crack inducing portion 32 extends linearly and continuously.

  The crack inducing portion 32 is not limited to the concave portion, and is, for example, a modified region modified by irradiating the upper surface 14b of the wavelength conversion member 14 (and / or the lower surface 14a of the wavelength conversion member 14) with laser light. It may be. The modified region is described in detail in Japanese Patent No. 3408805.

  The crack inducing part 32 is a region 14B other than the directly upper part 14A of the wavelength conversion member 14, for example, a region immediately above the upper surface of the upper surface 14b of the wavelength conversion member 14, so that cracks do not occur in the directly upper part 14A of the wavelength conversion member 14. It is formed in the upper surface peripheral region 14b2 other than 14b1 (see FIG. 2A). The crack inducing portion 32 is a portion 14B of the wavelength conversion member 14 other than the immediate upper portion 14A, that is, the lower surface peripheral region 14a2 other than the lower surface region 14a1 of the lower surface 14a of the wavelength conversion member 14 and the upper surface of the wavelength conversion member 14. 14b may be formed in at least one or both of the upper surface peripheral regions 14b2 other than the region 14b1 directly above the upper surface (see FIGS. 4 to 8). In addition, it is desirable to form the crack induction part 32 in the location far from the area 14a1 right above the lower surface of the wavelength conversion member 14.

  Next, the effect | action of the crack induction part 32 is demonstrated.

  3A shows how the crack C is induced starting from the crack inducing portion 32, FIG. 3B shows how the crack C progresses, and FIG. 3C shows the laser from the laser element 16. The light Ray1 is wavelength-converted and does not pass through the crack C and is irradiated outside. In FIG. 3C, the symbol Ray1 represents the laser beam from the laser element 16, and the symbol Ray2 represents light emission whose wavelength has been converted.

  As shown in FIG. 3A, when some external force F is applied to the wavelength conversion member 14 irradiated with the laser beam Ray1 from the laser element 16, the crack C is induced from the crack inducing portion 32 as a starting point. This is because, since the crack inducing portion 32 is a recess, the external stress generated when the external force F is applied (and / or the heat generated when the wavelength conversion member 14 is irradiated with the laser light Ray1 from the laser element 16). This is because stress is concentrated (stress concentration) on the crack inducing portion 32. Therefore, by forming the crack inducing portion 32 in at least one of the lower surface peripheral region 14a2 and the upper surface peripheral region 14b2 of the wavelength conversion member 14, it is possible to induce the crack C at the target location.

  Thereafter, the induced crack C develops due to internal stress (and / or thermal stress generated by continuing to be irradiated with laser light from the laser element 230) generated by the external force F being continuously applied. (See FIG. 3B). The progress direction of the crack C is controlled so that the crack C is directed in a direction other than the region 14a1 directly above the lower surface of the wavelength conversion member 14 (for example, the thickness direction of the wavelength conversion member 14).

  Control of the propagation direction of the crack C can be achieved by adjusting the shape, location and number of the recesses (crack induction part 32), the position of the vertex V of the triangular shape (cross section) constituting the recess (crack induction part 32), etc. It can be carried out.

  For example, as shown in FIG. 2A, the apex V of the triangular shape (cross section) constituting the concave portion (crack inducing portion 32) passes through the center (or substantially the center) of the triangular base B in the thickness direction. By positioning on the extending straight line L, the progress direction of the crack C can be controlled in the thickness direction of the wavelength conversion member 14 (see FIG. 3B).

  Also, for example, as shown in FIG. 4A, a triangular shape (cross section) apex V constituting the concave portion (crack inducing portion 32) passes through the center of the triangular base B and extends in the thickness direction. On the other hand, by positioning the wavelength conversion member 14 on the side opposite to the side where the region 14a1 directly above the lower surface is located, the progress direction of the crack C is controlled in a direction away from the region 14a1 directly above the lower surface of the wavelength conversion member 14. (See FIG. 4B). According to the example of FIG. 4B, more region of the adhesive 30 remains than in the example of FIG. 3B, so that even if the wavelength conversion member 14 is completely cracked, it is difficult to drop off from the cap 12. .

  Further, for example, as shown in FIG. 5 (a), by forming the crack inducing portion 32 in each of the lower surface peripheral region 14a2 and the upper surface peripheral region 14b2 of the wavelength conversion member 14 (for example, at a position facing each other), Compared with the case where the crack inducing portion 32 is formed in either the lower surface peripheral region 14a2 or the upper surface peripheral region 14b2 of the wavelength conversion member 14 (see FIGS. 2A and 4A), the target is more accurately targeted. Cracks C can be generated at the spots (see FIG. 5B).

  As described above, when any external force is applied to the wavelength conversion member 14 by forming the crack inducing portion 32 in the wavelength conversion member 14, the crack C is formed in the upper portion 14 </ b> A immediately above the through hole H in the wavelength conversion member 14. To prevent the crack C from occurring (that is, to prevent the crack C from occurring in a state where the crack C penetrates the region 14a1 directly above the lower surface and the region 14b1 directly above the upper surface of the wavelength conversion member 14) It becomes possible. That is, the crack C can be generated at a location aimed at. As a result, the laser beam Ray1 from the laser element 16 can be prevented from being irradiated to the outside through the crack C without being subjected to wavelength conversion (see FIG. 3C). In FIG. 3C, the symbol Ray1 represents the laser beam from the laser element 16, and the symbol Ray2 represents light emission whose wavelength has been converted.

  Next, a modified example of the crack inducing portion 32 will be described.

  FIG. 6A is a modification example of the crack inducing portion 32 (modification example), and FIG. 6B is a diagram showing a state in which the induced crack C progresses starting from the crack inducing portion 32 (modification example).

  As shown in FIG. 6 (a), the lower crack inducing portion 32 is formed at a location far from the region 14a1 directly above the lower surface of the wavelength conversion member 14 as compared with the upper crack inducing portion 32. The direction can be controlled in a direction away from the region 14a1 directly above the lower surface of the wavelength conversion member 14 (see FIG. 6B). As a result, more area of the adhesive 30 remains, so that even if the wavelength conversion member 14 is completely cracked, it is difficult to fall off the cap 12.

  FIG. 7A is a modified example of the crack inducing portion 32 (modified example), and FIG. 7B is a diagram showing a state in which the induced crack C is developed starting from the crack inducing portion 32 (modified example).

  As shown in FIG. 7 (a), the upper and lower crack induction portions 32 shown in FIG. 6 (a) are formed on both sides of the wavelength conversion member 14, thereby making it possible to convert wavelength compared to the example of FIG. 6 (a). Even if the member 14 is completely cracked, it is more difficult to drop off the cap 12.

  FIG. 8A shows a modification of the crack inducing portion 32 (modification).

  As shown in FIG. 8, the wavelength conversion member 14 is formed such that the thickness of the portion 14 </ b> A immediately above the through hole H in the wavelength conversion member 14 is relatively thicker than the portion 14 </ b> B other than the portion 14 </ b> A in the wavelength conversion member 14. Compared with the other part 14B, it is possible to make the crack C less likely to enter the 14A directly upper part 14A.

  The cross section of the upper surface 14b of the upper part 14A is an upwardly convex arc E (extends in a direction perpendicular to the paper surface in FIG. 8), and both ends of the arc E extend to the inside of the peripheral part 14B of the wavelength conversion member 14. ing. One end and the other end of the arc E constitute one side of a triangular shape (cross section) that constitutes a recess (crack inducing portion 32) formed at each end of the arc E. The triangular vertex V has a region 14a1 directly above the lower surface of the wavelength converting member 14 with respect to a straight line L that passes through the center (or substantially the center) of the base B of the triangular shape (cross section) and extends in the thickness direction of the wavelength converting member 14. It is located on the opposite side of the side where it is located.

  As described above, the cross section of the upper surface 14b of the immediately upper portion 14A is an upwardly convex arc E (extending in a direction perpendicular to the paper surface in FIG. 8), so that concave portions (cracks) are formed at both ends of the arc E. There is an advantage that the inducing part 32) can be easily formed.

  As described above, according to the light emitting device 10 of the present embodiment, when some external force F is applied to the wavelength conversion member 14, the crack C is caused to pass through the through hole H in the wavelength conversion member 14 by the action of the crack inducing portion 32. In order to prevent the crack C from occurring in the immediately upper portion 14A (that is, the crack C does not occur in a state where the crack C penetrates the region 14a1 directly above the lower surface and the region 14b1 directly above the upper surface of the wavelength conversion member 14) The direction can be controlled. That is, the crack C can be generated at a location aimed at. As a result, it is possible to prevent the laser light from the laser element 16 from being irradiated outside through the crack C without being wavelength-converted.

  Next, a modified example will be described.

  FIG. 9 shows an example of the light emitting device 10 (modified example) using the condensing lens 36, and FIG. 10 shows an example of the light emitting device 10 (modified example) using the light guide 38.

  The light-emitting device 10 is not limited to a structure (see FIG. 1) in which the wavelength conversion member 14 and the laser element 16 are arranged close to each other and packaged (see FIG. 1), and as illustrated in FIG. 9, the wavelength conversion member 14 and the laser element 16 May be arranged apart from each other, and a condensing lens 36 for condensing the laser light from the laser element 16 and irradiating the wavelength conversion member 14 may be disposed between them, as shown in FIG. As described above, the wavelength conversion member 14 and the laser element 16 are spaced apart from each other, and a light guide 38 (for example, an optical fiber) that guides the laser light from the laser element 16 and irradiates the wavelength conversion member 14 therebetween. ) May be arranged.

  Next, an example of a vehicle lamp (for example, a vehicle headlamp) using the light emitting device 10 having the above-described configuration will be described.

  FIG. 11 shows a so-called direct projection type (also referred to as a direct projection type) vehicle using a projection lens 52 as an optical system configured to control the light from the light emitting device 10 to irradiate the front of the vehicle. It is an example of the lamp 50. The projection lens 52 and the light emitting device 10 disposed behind the projection lens 52 are held by a holder 54 so as to have a predetermined positional relationship.

  FIG. 12 shows a so-called projector-type vehicular lamp 60 that uses a reflecting surface 62, a shade 64, and a projection lens 66 as an optical system configured to control light from the light emitting device 10 and irradiate the front of the vehicle. It is an example. The reflection surface 62, the shade 64, the projection lens 66, and the light emitting device 10 are held by a holder 68 so as to have a predetermined positional relationship.

  Note that the light emitting device 10 can be used as a light source other than the vehicular lamp, for example, a general illumination, a projector, an indoor illumination, an outdoor illumination, a projector, and the like.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

  DESCRIPTION OF SYMBOLS 10 ... Light-emitting device, 12 ... Cap, 12a1 ... Partial area | region, 14 ... Wavelength conversion member, 14A ... Directly upper part, 14B ... Partially, 14a ... Lower surface, 14a1 ... Lower surface immediately above area | region, 14a2 ... Lower surface periphery area | region, 14b ... Upper surface, 14b1 ... Region just above the upper surface, 14b2 ... Upper surface peripheral region, 16 ... Laser element, 16a ... Light emitting portion, 18 ... Base, 18a ... Element base, 20 ... Tube portion, 22 ... Base portion, 24 ... Recess, 24a ... Bottom surface 26 ... Front surface, 28 ... Back surface, 30 ... Adhesive, 32 ... Crack induction part, 34 ... Electrode, 36 ... Condensing lens, 38 ... Light guide, 50 ... Vehicle lamp, 52 ... Projection lens, 54 ... Holder, 60 ... Vehicle lamp, 62 ... reflection surface, 64 ... shade, 66 ... projection lens, 68 ... holder

Claims (8)

A base portion including a front surface, a back surface opposite to the front surface, and a through hole penetrating the front surface and the back surface;
A wavelength conversion member that absorbs at least part of the laser light irradiated through the through hole and emits light of a different wavelength, covering the through hole and exposing a partial region from the through hole A wavelength including a first surface fixed to the surface in a state and a second surface opposite to the first surface, and a crack penetrating between the first surface and the second surface may occur A conversion member;
A laser element that emits a laser beam that passes through the through hole and irradiates a partial region of the first surface exposed from the through hole;
With
The wavelength converting member is a portion other than the upper part, wherein a crack inducing part that controls the crack inducing position and the direction in which the crack is induced is controlled so that the crack does not occur immediately above the through hole in the wavelength converting member. Light-emitting device included in   The crack inducing portion is formed in at least one or both of a region other than the region directly above the through hole in the first surface and a region other than the region immediately above the through hole in the second surface. The light-emitting device according to claim 1.   The light emitting device according to claim 1, wherein the crack inducing portion is a concave portion extending in a direction orthogonal to a thickness direction of the wavelength conversion member.   The crack inducing portion has a cross section when cut by a plane orthogonal to the direction in which the crack inducing portion extends, the vertex is located inside the wavelength conversion member, and the base is the first surface from the vertex. The light-emitting device according to claim 3, wherein the light-emitting device is a triangular prism-shaped recess having a triangular shape located on the second surface side.   The triangular apex is a straight line passing through the center of the triangular base and extending in the thickness direction, or the side where the region immediately above the through hole is located in the first surface with respect to the straight line. The light-emitting device according to claim 4, which is located on the opposite side.   The light emitting device according to any one of claims 1 to 5, wherein a thickness of the wavelength conversion member immediately above the through hole is relatively thicker than a portion of the wavelength conversion member other than the portion directly above.   The crack inducing portion is formed at a location facing each other in a region other than the region immediately above the through hole in the first surface and a region other than the region immediately above the through hole in the second surface. The light emitting device according to claim 1. A light emitting device according to any one of claims 1 to 7;
An automotive lamp comprising: an optical system configured to control light from the light emitting device to irradiate the front of the vehicle.

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