JP2013196818A - Light-emitting device and vehicular lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device, and a vehicular lamp using the same, preventing a wavelength conversion member from falling off.SOLUTION: A light-emitting device includes a light guide 12 guiding light between an incident face 12a and an emission face 12b, a retaining member 14 for retaining the light guide, an excitation light source 24 generating excitation light, a plate part 30 with an opening of nearly the same size as the emission face formed at a site where a cylindrical part 28 for the retaining member to be fitted in and the emission face of the light guide retained by the retaining member fitted into the cylindrical part, for clogging an open end at a tip of the cylindrical part, and a wavelength conversion member 16 absorbing the excitation light emitted from the emission face and converting wavelengths to release light of a given wavelength band. The wavelength conversion member is at least partly exposed from the above opening, and that, is pinched between the plate part and the emission face of the light guide, in a state covering the emission face.

Description

  The present invention relates to a light emitting device and a vehicle lamp using the same, and more particularly to a light emitting device using an excitation light source and a wavelength conversion member and a vehicle lamp using the same.

  Conventionally, a light-emitting device that combines an excitation light source and a wavelength conversion member has been proposed (see, for example, Patent Document 1).

  FIG. 6 is a longitudinal sectional view of the light emitting device 200 described in Patent Document 1. As shown in FIG.

  As shown in FIG. 6, the light emitting device 200 described in Patent Document 1 includes an excitation light source 210 (laser diode) and a wavelength conversion member 220 (phosphor composition) arranged to receive light from the excitation light source 210. In addition, a lens 230 or the like through which light emitted from the wavelength conversion member 220 passes is provided.

  In the light emitting device 200 described in Patent Document 1, the wavelength conversion member 220 irradiated with the excitation light (laser light) from the excitation light source 210 is the light that is excited by the excitation light from the excitation light source 210 and the wavelength conversion member 220. White light is emitted by mixing the excitation light from the transmitted excitation light source 210.

Japanese Patent Laid-Open No. 2005-20010

  However, the light emitting device 200 described in Patent Document 1 has a problem that the wavelength conversion member may fall off due to vibration or impact (for example, vibration or impact of a vehicle in which the light emitting device 200 is mounted).

  This invention is made | formed in view of such a situation, and it aims at providing the light-emitting device which can prevent that a wavelength conversion member falls, and a vehicle lamp using the same.

  In order to achieve the above object, the invention according to claim 1 includes a light incident surface and a light exit surface, guides excitation light introduced from the light entrance surface to the light exit surface, and the light exit surface. A light guide to be emitted from, a holding member that holds the light guide, an excitation light source that generates excitation light introduced into the light guide from the light incident surface, and a cylindrical portion in which the holding member is fitted, A plate portion that closes the open end at the tip of the tube portion, and is substantially the same size as the light exit surface at a location where the light exit surface of the light guide held by the holding member fitted to the tube portion faces. And a plate member having an opening formed therein, and a wavelength conversion member that absorbs excitation light emitted from the light exit surface and converts the wavelength to emit light in a predetermined wavelength range. And the wavelength converting member is the wavelength converting member. At least a portion is exposed from the opening, and the wavelength conversion member is sandwiched between the plate portion of the metal member and the light guide surface of the light guide in a state of covering the light output surface. And

  According to the first aspect of the present invention, since the wavelength conversion member is sandwiched between the plate portion of the metal member and the light output surface of the light guide, vibration, impact, etc. (for example, a light emitting device is mounted). It becomes possible to prevent the wavelength conversion member from falling off from the light exit surface of the light guide due to vehicle vibration / impact (fail safe).

  According to the first aspect of the present invention, since the wavelength conversion member is sandwiched between the plate portion of the metal member and the light exit surface of the light guide, the heat generation heat dissipation path (wavelength conversion) of the wavelength conversion member is obtained. Member → metal member → holding member). Thereby, it is possible to efficiently dissipate heat generated by the wavelength conversion member. As a result, the light emission efficiency of the light emitting device can be improved.

  As described above, according to the first aspect of the present invention, it is possible to configure a light emitting device in which the wavelength conversion member is prevented from falling off and the light emission efficiency is high.

  The invention according to claim 2 is the invention according to claim 1, wherein the wavelength conversion member is such that the periphery of the opening of the plate portion of the metal member is in contact with the outer peripheral portion of the surface of the wavelength conversion member, The outer peripheral portion of the back surface of the wavelength conversion member is sandwiched between the plate portion of the metal member and the light exit surface in a state of being in contact with the holding member.

  According to the second aspect of the present invention, in addition to the heat dissipation path (wavelength conversion member → metal member → holding member), the heat dissipation path (wavelength conversion member → holding member) is configured. This makes it possible to dissipate the heat generated by the wavelength conversion member more efficiently. As a result, the light emission efficiency of the light emitting device can be further improved.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the opening is a tapered opening.

  According to the third aspect of the present invention, it is possible to prevent or reduce the light emitted from the wavelength conversion member from being shielded around the opening. Therefore, the light is emitted from the wavelength conversion member through the opening. The light extraction efficiency is improved.

  The invention according to claim 4 includes a light entrance surface and a light exit surface, guides the excitation light introduced from the light entrance surface to the light exit surface, and emits the light guide from the light exit surface; A holding member that holds the light guide; an excitation light source that generates excitation light introduced into the light guide from the light incident surface; and an excitation light emitted from the light emission surface that is absorbed and converted to a predetermined wavelength. A wavelength conversion member that emits light in the wavelength range of the above, and a transparent plate fixed to the holding member, the wavelength conversion member is in a state where the wavelength conversion member covers the light output surface, It is sandwiched between a transparent plate and the light exit surface.

  According to the fourth aspect of the present invention, since the wavelength conversion member is sandwiched between the transparent plate and the light exit surface of the light guide, vibration, impact, etc. (for example, vibration of a vehicle equipped with a light emitting device) It is possible to prevent the wavelength conversion member from falling off the light exit surface of the light guide due to impact or the like (fail safe).

  Further, according to the invention of claim 4, since the wavelength conversion member is sandwiched between the transparent plate and the light exit surface of the light guide, the long conversion member → A transparent plate → metal member → holding member is formed. Thereby, it is possible to efficiently dissipate heat generated by the wavelength conversion member. As a result, the light emission efficiency of the light emitting device can be improved.

  As described above, according to the fourth aspect of the present invention, it is possible to configure a light emitting device that prevents the wavelength conversion member from falling off and that has high luminous efficiency.

  The invention according to claim 5 includes a light guide that includes a light incident surface and a light exit surface, guides excitation light introduced from the light incident surface to the light exit surface, and emits the light from the light exit surface; A holding member that holds the light guide; an excitation light source that generates excitation light that is introduced into the light guide from the light incident surface; a cylindrical portion in which the holding member is fitted; and an opening at the tip of the cylindrical portion A plate portion whose end is closed, wherein an opening having a size substantially the same as that of the light exit surface is formed at a location where the light exit surface of the light guide held by the holding member fitted to the tube portion faces. A metal member including a portion, a wavelength conversion member that absorbs excitation light emitted from the light exit surface, converts the wavelength to emit light in a predetermined wavelength range, and covers the opening while covering the opening A transparent plate fixed to Length conversion member, in a state in which the wavelength conversion member covers the light emitting surface, characterized in that it is sandwiched between the light emitting surface and the transparent plate.

  According to the fifth aspect of the present invention, since the wavelength conversion member is sandwiched between the transparent plate and the light exit surface of the light guide, vibration, impact, etc. (for example, vibration of a vehicle equipped with a light emitting device) It is possible to prevent the wavelength conversion member from falling off the light exit surface of the light guide due to impact or the like (fail safe).

  According to the invention described in claim 5, since the wavelength conversion member is sandwiched between the transparent plate and the light guide surface of the light guide, the heat generation heat dissipation path of the wavelength conversion member (wavelength conversion member → transparent Plate → metal member → holding member). Thereby, it is possible to efficiently dissipate heat generated by the wavelength conversion member. As a result, the light emission efficiency of the light emitting device can be improved.

  As described above, according to the invention described in claim 5, it is possible to configure a light emitting device in which the wavelength conversion member is prevented from falling off and the light emission efficiency is high.

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

  A vehicle lamp comprising the light-emitting device according to claim 1.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the light-emitting device which can prevent that a wavelength conversion member falls, and a vehicle lamp using the same.

(A) A cross-sectional view of the light emitting device 10 provided with the light guide 12 taken along a vertical plane including its optical axis, (b) the wavelength conversion member 16 of the light emitting device 10 and the light guide 12 shown in FIG. It is sectional drawing to which the joining location vicinity with the light emission surface 12b was expanded. (A) The expansion perspective view of the ferrule 14 to which the light guide 12 was fixed, (b) is the expansion perspective view of the metal member 20 to which the ferrule 14 was fixed. FIG. 6 is an enlarged cross-sectional view of the vicinity of a joint between the wavelength conversion member 16 of the light emitting device 10A and the light output surface 12b of the light guide 12. (A) Cross-sectional view enlarging the vicinity of the joint between the wavelength conversion member 16 of the light emitting device 10B and the light exit surface 12b of the light guide 12, (b) Enlarging the vicinity of the opening 30a formed in the plate portion 30 of the metal member 20. It is sectional drawing. 1 is a longitudinal sectional view of a vehicle lamp unit using a light emitting device 10. FIG. It is an example of the vehicle lamp 200 using the light source which combined the conventional excitation light source and the wavelength conversion member.

[First Embodiment]
Hereinafter, the light-emitting device 10 which is 1st Embodiment of this invention is demonstrated, referring drawings.

  1A is a cross-sectional view of a light emitting device 10 having a light guide 12 cut along a vertical plane including its optical axis, and FIG. 1B is a wavelength conversion member of the light emitting device 10 shown in FIG. 16 is an enlarged cross-sectional view of the vicinity of a joint portion between 16 and the light output surface 12b of the light guide 12. FIG. 2A is an enlarged perspective view of the ferrule 14 to which the light guide 12 is fixed, and FIG. 2B is an enlarged perspective view of the metal member 20 to which the ferrule 14 is fixed.

  The light-emitting device 10 of this embodiment is provided with the light guide 12, the ferrule 14, the wavelength conversion member 16, the light source unit 18, the metal member 20, etc. as shown to Fig.1 (a)-FIG.2 (b).

  As shown in FIG. 1A, the light guide 12 includes a light entrance surface 12a and a light exit surface 12b, and guides (or transmits) the excitation light introduced from the light entrance surface 12a to the light exit surface 12b. The light guide member emits light from the light exit surface 12b, for example, an optical fiber including a core at the center and a clad covering the periphery of the core. In this embodiment, the light guide 12 is a rectangle having an aspect ratio of the core cross section of 1: 2 = height H (for example, 0.4 [mm]): width W (for example, 0.8 [mm]), and NA. A 0.22 optical fiber is used. The outer shape (cross section) of the clad of the light guide 12 is circular (Φ1.5 [mm]).

  The aspect ratio of the core cross section may be 1: 2 or more, and may be an ellipse other than a rectangle, for example. Thus, by using the light guide 12 having an aspect ratio of the core cross section of 1: 2 or more, it is suitable for forming a light distribution pattern for a vehicle lamp (for example, a high beam light distribution pattern or a low beam light distribution pattern). In addition, it is possible to form a light source image having a long left-right direction (vehicle width direction).

  The core has a higher refractive index than the clad. Therefore, the excitation light introduced into the light guide 12 from the light incident surface 12a of the light guide 12 is guided to the light emitting surface 12b in a state of being confined inside the core using total reflection at the boundary between the core and the clad. Then, the light exits from the light exit surface 12b.

  The ferrule 14 is a member for holding the light guide 12 (corresponding to the holding member of the present invention), and as shown in FIG. 1B, the light guide that connects the center of the distal end surface 14a and the center of the base end surface 14b. A through-hole 14c for use is formed. The light guide 12 is held by the ferrule 14 with the light exit surface 12b side inserted into the light guide through hole 14c. The light guide 12 and the ferrule 14 are fixed by a known means such as an adhesive or welding. The distal end surface (light exit surface 12b) of the light guide 12 and the distal end surface 14a of the ferrule 14 are made to be the same plane orthogonal to the axis of the light guide through hole 14c by polishing the distal end surface 14a of the ferrule 14. .

  As shown in FIG. 1 (a), the base end portion of the light guide 12 is inserted into a light guide through hole 22a formed in a metal holder 22 such as aluminum, and the holder 22 is publicly known such as adhesive or welding. It is fixed by means of. The proximal end surface (light incident surface 12 a) of the light guide 12 is disposed near the front of the excitation light source 24. A condensing lens 26 is disposed between the light incident surface 12a of the light guide 12 and the excitation light source 24 so that the excitation light from the excitation light source 24 is efficiently incident.

  The excitation light source 24 is an excitation light source that generates excitation light. For example, the excitation light source 24 is a laser light source such as a laser diode having a blue wavelength (for example, a wavelength of 430 nm to 460 nm).

  The excitation light source 24 only needs to constitute a white light source that is combined with the wavelength conversion member 16 and emits white light that satisfies the white range on the CIE chromaticity diagram defined by law. Other than the system (for example, wavelength 430 nm to 460 nm), for example, a laser light source such as a laser diode in the near ultraviolet region (for example, 200 to 420 nm) may be used.

  The excitation light source 24 and the condenser lens 26 are fixed to the holder 22 by a known means such as an adhesive or welding to constitute the light source unit 18 (see FIG. 1A).

  The light guide 12 only needs to be able to guide the excitation light from the excitation light source 24, and may be a single-wire fiber or a multi-wire fiber. The light guide 12 may be a single mode fiber or a multimode fiber. The material of the light guide 12 is not particularly limited. For example, the light guide 12 may be made of quartz glass, may be made of plastic, or may be a light guide member (for example, a light guide rod) made of a transparent resin. The light guide 12 is preferably a single fiber or a multimode fiber.

  The ferrule 14 may be made of stainless steel, nickel, or zirconia, or may be made of other metal, resin, or glass, and the material thereof is not particularly limited.

  Note that a Peltier element or a heat sink as a cooling device (not shown) is connected to the laser light source as the excitation light source 24.

  The wavelength conversion member 16 is a wavelength conversion member that absorbs excitation light from the excitation light source 24, converts the wavelength, and emits light in a predetermined wavelength range.

  For example, when a laser light source such as a laser diode having a blue wavelength (for example, a wavelength of 430 nm to 460 nm) is used as the excitation light source 24, the wavelength conversion member 16 is excited to emit light with a blue color (for example, a wavelength of 430 nm to 460 nm). A phosphor (phosphor such as a YAG phosphor ceramic whose emission wavelength is yellow) is used.

  Further, for example, when a laser light source such as a laser diode having a wavelength in the near ultraviolet region (for example, 200 to 420 nm) is used as the excitation light source 24, excitation light emission is performed with light in the near ultraviolet region (for example, 200 to 420 nm) as the wavelength conversion member 16. Phosphor that emits light (mixed phosphor with blue, green, and red emission wavelengths), or a phosphor that emits and emits light by light in the near ultraviolet region (for example, 200 to 420 nm) (mixed phosphor with blue and yellow emission wavelengths). Used.

  The wavelength conversion member 16 includes a portion 16 a that is larger than the diameter of the clad (or core) of the light guide 12 and covers the light exit surface 12 b of the light guide 12, and a portion 16 b that contacts the tip surface 14 a of the ferrule 14. (See FIG. 1 (b) and FIG. 2 (b)). The wavelength converting member 16 may have a rectangular shape (see FIG. 2B) or a circular shape (for example, Φ2...) Larger than the diameter (for example, Φ1.5 [mm]) of the light guide 12 (clad). 0 [mm]).

  The metal member 20 includes a cylindrical portion 28 into which the ferrule 14 is fitted, a plate portion 30 that closes the opening end of the distal end of the cylindrical portion 28, and the like. The metal member 20 is integrally formed of a metal such as aluminum in order to function as a heat transfer means (heat dissipation path) through which the heat generated by the wavelength conversion member 16 passes.

  An opening 30a is formed in the plate portion 30 at a location where the light exit surface 12b of the light guide 12 held by the ferrule 14 fitted to the tube portion 28 is opposed (FIG. 1B, FIG. 2). b)).

  As shown in FIG. 1B, the opening 30a formed in the plate portion 30 is a two-stage opening including a large-diameter portion 30b on the light guide 12 side and a small-diameter portion 30c on the opposite side. A step portion 30d is formed between 30b and the small diameter portion 30c.

  The large-diameter portion 30 b is an opening having substantially the same size as the wavelength conversion member 16. The wavelength conversion member 16 is disposed in the large diameter portion 30b in a state where the outer peripheral portion of the surface 16c is in contact with the stepped portion 30d. The wavelength conversion member 16 (the outer peripheral portion of the surface 16c thereof) and the stepped portion 30d are desirably fixed by a known means such as an adhesive or welding.

  Due to variations in processing and molding, a gap S1 is generated between the wavelength conversion member 16 and the large diameter portion 30b. This gap S1 is a member 32 (for example, heat conduction grease or adhesive) having a higher thermal conductivity than the ambient air in order to make this gap function as heat transfer means (heat release path) through which heat generated by the wavelength conversion member 16 passes. Filled. Accordingly, the first heat radiation path through which heat generated by the wavelength conversion member 16 passes (the wavelength conversion member 16 → the member 32 having a higher thermal conductivity than the ambient air (for example, a white resin having a relatively high reflectance) → the metal member 20 → A ferrule 14) is constructed. Accordingly, the heat generated by the wavelength conversion member 16 passes in the order of the member 32 having a higher thermal conductivity than the surrounding air (for example, a white resin having a relatively high reflectance) → the metal member 20 → the ferrule 14, and the surrounding air from the ferrule 14. The heat is dissipated.

  The small-diameter portion 30c is the same size as or slightly larger than the light exit surface 12b of the light guide 12. The small-diameter portion 30 c is preferably a tapered opening that tapers toward the wavelength conversion member 16 so as not to block light emitted from the wavelength conversion member 16. In this way, it is possible to prevent or reduce the light emitted from the wavelength conversion member 16 from being shielded around the opening 30a (around the small diameter portion 30c). The extraction efficiency of light emitted through the small diameter portion 30c) is improved. Further, the directivity angle of light emitted from the wavelength conversion member 16 can be set to a desired angle by adjusting the height and angle of the taper.

  The distal end portion of the ferrule 14 is inserted into the cylindrical portion 28 of the metal member 20 until the distal end surface 14a (the light exit surface 12b of the light guide 12) abuts against the plate portion 30 (wavelength conversion member 16) of the metal member 20. It is mated. The metal member 20 and the ferrule 14 are fixed by a known means such as an adhesive or welding.

  As a result, the wavelength conversion member 16 is a metal in a state where at least a part of the wavelength conversion member 16 is exposed from the opening 30a (small diameter portion 30c) and the wavelength conversion member 16 covers the light exit surface 12b of the light guide 12. It is sandwiched between the plate part 30 (step part 30 d) of the member 20 and the light exit surface 12 b of the light guide 12. That is, in the wavelength conversion member 16, the periphery of the opening 30 a (small diameter portion 30 c) of the plate portion 30 of the metal member 20 contacts the outer peripheral portion of the surface 16 c of the wavelength conversion member 16, and the outer periphery of the back surface 16 d of the wavelength conversion member 16. The portion is sandwiched between the plate portion 30 (stepped portion 30 d) of the metal member 20 and the light exit surface 12 b of the light guide 12 in a state where the portion is in contact with the ferrule 14 (the front end surface 14 a thereof). The wavelength conversion member 16 and the light exit surface 12b of the light guide 12 are preferably fixed by an adhesive such as a transparent resin that transmits the excitation light from the excitation light source 24.

  As described above, since the wavelength conversion member 16 is sandwiched between the plate portion 30 (stepped portion 30d) of the metal member 20 and the light exit surface 12b of the light guide 12, vibration, impact, etc. (for example, a light emitting device) It is possible to prevent the wavelength conversion member 16 from falling off the light exit surface 12b of the light guide 12 due to vibrations / impacts of the vehicle on which the vehicle 10 is mounted (fail safe).

  Further, the periphery of the opening 30a (small diameter portion 30c) in the plate portion 30 of the metal member 20 contacts the outer peripheral portion of the front surface 16c of the wavelength conversion member 16, and the outer peripheral portion of the rear surface 16d of the wavelength conversion member 16 is the ferrule 14 The second heat dissipation path (wavelength conversion member 16 → metal member 20 → ferrule 14) and the third heat dissipation path (wavelength conversion member 16 → ferrule) through which heat generated by the wavelength conversion member 16 passes by contacting the tip surface 14a). 14) is configured.

  Therefore, the heat generated by the wavelength conversion member 16 passes through the contact portion between the wavelength conversion member 16 (the outer peripheral portion of the surface 16c thereof) and the metal member 20 (the step portion 30d of the plate portion 30) → the metal member 20 → the ferrule 14 in this order. Then, heat is radiated from the ferrule 14 (or a heat radiation fin of a heat sink fixed to the ferrule 14) to the surrounding air.

  Further, the heat generated by the wavelength conversion member 16 passes in the order of the contact point of the wavelength conversion member 16 (the outer peripheral portion of the back surface 16d) and the ferrule 14 (the front end surface 14a) → the ferrule 14, and the ferrule 14 (or the ferrule). The heat is dissipated from the heat dissipating fins of the heat sink fixed to 14) to the surrounding air.

  By the action of the first to third heat dissipation paths, the heat generated by the wavelength conversion member 16 can be efficiently dissipated. As a result, the light emission efficiency of the light emitting device 10 can be improved.

  In order to further enhance the heat dissipation effect, it is desirable to provide heat dissipation fins on the metal member 20 (and / or ferrule 14) or to fix the heat sink to the metal member 20 (and / or ferrule 14).

  In the light emitting device 10 having the above-described configuration, the excitation light from the excitation light source 24 is introduced into the light guide 12 from the light incident surface 12a of the light guide 12, guided to the light output surface 12b, and emitted from the light output surface 12b. The wavelength conversion member 16 is irradiated.

  The wavelength conversion member 16 irradiated with the excitation light is excited by the excitation light (scattered light) from the excitation light source 24 scattered on the surface (and / or inside) and the excitation light incident from the excitation light source 24 and emitted light. White light (pseudo white light) due to color mixture with light from the conversion member 16 is emitted.

  Since the excitation light that irradiates the wavelength conversion member 16 is guided inside the wavelength conversion member 16, the actual light emission size of the wavelength conversion member 16 is larger than the light exit surface 12 b of the light guide 12.

  When using mixed color light of excitation light from the excitation light source 24 (for example, blue-based excitation light) and light (for example, yellow-based light) emitted by the wavelength conversion member 16, excitation is performed with the guided excitation light. Since the component of the emitted light (for example, yellow light) becomes strong, it causes color unevenness (when the light emitting device 10 is used for a vehicle headlamp (headlamp), excitation light is emitted by the guided excitation light. The glare is the source of glare).

  On the other hand, in the present embodiment, the portion where the excitation light is guided and the color unevenness is generated is masked by the metal member 20 (the step portion 30d of the plate portion 30). Accordingly, it is possible to configure the light emitting device 10 in which the wavelength conversion member 16 (the portion exposed from the opening 30a) emits light uniformly without color unevenness.

  As described above, according to the light emitting device 10 of the present embodiment, the wavelength conversion member 16 is sandwiched between the plate portion 30 (stepped portion 30 d) of the metal member 20 and the light exit surface 12 b of the light guide 12. Therefore, it is possible to prevent the wavelength conversion member 16 from falling off the light exit surface 12b of the light guide 12 due to vibration or impact (for example, vibration or impact of a vehicle on which the light emitting device 10 is mounted). fail safe).

  Further, according to the light emitting device 10 of the present embodiment, the heat generated by the wavelength conversion member 16 can be efficiently radiated by the action of the first to third heat dissipation paths. As a result, the light emission efficiency of the light emitting device 10 can be improved. The first and third heat radiation paths can be omitted.

  As described above, according to the light emitting device 10 of the present embodiment, the wavelength conversion member 16 is prevented from falling off, and a light emitting device with high light emission efficiency can be configured.

[Second Embodiment]
Next, a light emitting device 10A according to a second embodiment of the present invention will be described with reference to the drawings.

  FIG. 3 is an enlarged cross-sectional view of the vicinity of the joint between the wavelength conversion member 16 of the light emitting device 10 </ b> A and the light exit surface 12 b of the light guide 12.

  The light emitting device 10A shown in FIG. 3 uses a transparent plate 34 instead of the metal member 20 as compared with the light emitting device 10 shown in FIG. The wavelength conversion member 16 is different from the transparent plate 34 and the light exit surface 12b of the light guide 12 in that the size is equal to or slightly larger than 12b. Other than that, the configuration is the same as that of the light emitting device 10. Hereinafter, the difference from the light-emitting device 10 will be mainly described, and the same components as those of the light-emitting device 10 will be denoted by the same reference numerals and description thereof will be omitted.

  The wavelength conversion member 16 is fixed to the light output surface 12b of the light guide 12 with an adhesive such as a transparent resin through which excitation light from the excitation light source 24 passes. The wavelength conversion member 16 has a size that is the same as or slightly larger than the light exit surface 12 b of the light guide 12. Therefore, it is possible to prevent the occurrence of color unevenness caused by the excitation light emitted from the light exit surface 12b of the light guide 12 being guided inside the wavelength conversion member 16.

  The light guide through hole 14c until the wavelength conversion member 16 (surface 16c) fixed to the light output surface 12b is flush with the ferrule 14 (tip surface 14a) on the front end portion (light output surface 12b side) of the light guide 12. And is held by the ferrule 14. The light guide 12 and the ferrule 14 are fixed by a known means such as an adhesive or welding.

  Due to variations in processing and molding, a gap S2 is generated between the wavelength conversion member 16 and the light guide through hole 14c. In order to make this gap S2 function as a heat transfer means (heat dissipation path) through which heat generated by the wavelength conversion member 16 passes, the member 32 (for example, a white resin having a relatively high reflectivity than the ambient air). ). Thus, the first heat radiation path (wavelength conversion member 16 → member 32 having a higher thermal conductivity than the surrounding air (for example, white resin having a relatively high reflectance) → ferrule 14) through which heat generated by the wavelength conversion member 16 passes is obtained. It is configured. Therefore, the heat generated by the wavelength conversion member 16 passes in the order of the member 32 (for example, white resin having a relatively high reflectance) having higher thermal conductivity than the ambient air → the ferrule 14 and is radiated from the ferrule 14 to the ambient air. .

  Moreover, the light emitted from the wavelength conversion member 16 is reflected by the white resin by using a white resin having a relatively high reflectance as the member 32 having a higher thermal conductivity than the ambient air filling the gap S2. Therefore, the extraction efficiency of light emitted from the wavelength conversion member 16 through the transparent plate 34 is improved.

  The transparent plate 34 is, for example, a transparent plate made of a material (for example, sapphire) having a higher thermal conductivity than the glass used for the light guide 12 and transmitting light emitted from the wavelength conversion member 16. The ferrule 14 is fixed to the tip surface 14a by a known means such as an adhesive or welding. Accordingly, the wavelength conversion member 16 is sandwiched between the transparent plate 34 and the light output surface 12b of the light guide 12 in a state where the light output surface 12b of the light guide 12 is covered. That is, the wavelength conversion member 16 is sandwiched between the transparent plate 34 and the light exit surface 12 b of the light guide 12 in a state where it is in contact with the transparent plate 34.

  As described above, since the wavelength conversion member 16 is sandwiched between the transparent plate 34 and the light output surface 12b of the light guide 12, vibration, impact, etc. (for example, vibration of the vehicle on which the light emitting device 10A is mounted) It is possible to prevent the wavelength conversion member 16 from falling off the light exit surface 12b of the light guide 12 due to impact or the like (fail safe).

  Further, when the transparent plate 34 comes into contact with the surface 16c of the wavelength conversion member 16, a second heat radiation path (wavelength conversion member 16 → transparent plate 34 → ferrule 14) through which the heat generated by the wavelength conversion member 16 passes is formed. Yes.

  Accordingly, the heat generated by the wavelength conversion member 16 passes in the order of contact between the transparent plate 34 and the wavelength conversion member 16 (surface 16c) → transparent plate 34 → ferrule 14 and is fixed to the ferrule 14 (or the ferrule 14). The heat is dissipated from the heat sink fins) to the surrounding air.

  The heat of the wavelength conversion member 16 can be efficiently radiated by the action of the first and second heat radiation paths. As a result, the light emission efficiency of the light emitting device 10A can be improved.

  In order to further enhance the heat radiation effect, it is desirable to provide heat radiation fins on the ferrule 14 or to fix the heat sink to the ferrule 14.

  In the light emitting device 10A having the above-described configuration, the excitation light from the excitation light source 24 is introduced into the light guide 12 from the light incident surface 12a of the light guide 12, guided to the light output surface 12b, and emitted from the light output surface 12b. The wavelength conversion member 16 is irradiated.

  The wavelength conversion member 16 irradiated with the excitation light is excited by the excitation light (scattered light) from the excitation light source 24 scattered on the surface (and / or inside) and the excitation light incident from the excitation light source 24 and emitted light. White light (pseudo white light) due to color mixture with light from the conversion member 16 is emitted.

  The wavelength conversion member 16 has a size that is the same as or slightly larger than the light exit surface 12 b of the light guide 12. Therefore, it is possible to prevent the occurrence of color unevenness caused by the excitation light emitted from the light exit surface 12b of the light guide 12 being guided inside the wavelength conversion member 16. Therefore, the light emitting device 10A in which the wavelength conversion member 16 emits light uniformly without color unevenness can be configured.

  As described above, according to the light emitting device 10A of the present embodiment, since the wavelength conversion member 16 is sandwiched between the transparent plate 34 and the light exit surface 12b of the light guide 12, vibration or impact (for example, It is possible to prevent the wavelength conversion member 16 from falling off the light exit surface 12b of the light guide 12 due to vibrations / impacts of the vehicle on which the light emitting device 10A is mounted (fail safe).

  Further, according to the light emitting device 10A of the present embodiment, the heat generated by the wavelength conversion member 16 can be efficiently radiated by the action of the first and second heat radiation paths. As a result, the light emission efficiency of the light emitting device 10A can be improved. Note that the first heat radiation path can be omitted.

  As described above, according to the light emitting device 10A of the present embodiment, it is possible to configure a light emitting device in which the wavelength conversion member 16 is prevented from falling off and the light emission efficiency is high.

[Third Embodiment]
Next, a light emitting device 10B according to a third embodiment of the present invention will be described with reference to the drawings.

  4A is an enlarged cross-sectional view of the vicinity of the joint between the wavelength conversion member 16 of the light emitting device 10B and the light exit surface 12b of the light guide 12, and FIG. 4B is formed on the plate portion 30 of the metal member 20. It is sectional drawing to which the opening 30a vicinity was expanded.

  The light emitting device 10B shown in FIG. 4A has a wavelength conversion member 16 that is the same size as or slightly larger than the light emitting surface 12b of the light guide 12, compared to the light emitting device 10 shown in FIG. The wavelength converting member 16 is different in that it is sandwiched between the transparent plate 34 and the light exit surface 12b of the light guide 12. Other than that, the configuration is the same as that of the light emitting device 10. Hereinafter, the difference from the light-emitting device 10 will be mainly described, and the same components as those of the light-emitting device 10 will be denoted by the same reference numerals and description thereof will be omitted.

  The wavelength conversion member 16 is fixed to the light output surface 12b of the light guide 12 with an adhesive such as a transparent resin through which excitation light from the excitation light source 24 passes. The wavelength conversion member 16 has a size that is the same as or slightly larger than the light exit surface 12 b of the light guide 12. Therefore, it is possible to prevent the occurrence of color unevenness caused by the excitation light emitted from the light exit surface 12b of the light guide 12 being guided inside the wavelength conversion member 16.

  As shown in FIG. 4B, the opening 30a formed in the plate portion 30 is a two-stage opening including a small diameter portion 30e on the light guide 12 side and a large diameter portion 30f on the opposite side, and the small diameter portion 30e. A step portion 30g is formed between the large diameter portion 30f and the large diameter portion 30f.

  The large-diameter portion 30f is an opening having substantially the same size as the transparent plate 34. The transparent plate 34 is a transparent plate made of a material (for example, sapphire) that has higher thermal conductivity than the glass used for the light guide 12 and transmits light emitted from the wavelength conversion member 16, and its back surface. Is arranged in the large-diameter portion 30f in a state where the outer peripheral portion is in contact with the stepped portion 30g. The transparent plate 34 (the outer peripheral portion of the back surface thereof) and the stepped portion 30g are fixed by a known means such as an adhesive or welding.

  The small diameter portion 30 e is an opening having substantially the same size as the wavelength conversion member 16. The wavelength conversion member 16 is disposed in the small diameter portion 30e with its surface 16c in contact with the transparent plate. The wavelength conversion member 16 and the transparent plate 34 are preferably fixed with an adhesive such as a transparent resin through which excitation light from the excitation light source 24 is transmitted.

  Due to variations in processing and molding, a gap S3 is generated between the wavelength conversion member 16 and the small diameter portion 30e. This gap S3 is a member 32 (for example, heat conduction grease or adhesive) having a higher thermal conductivity than the surrounding air in order to make this gap S3 function as a heat transfer means (heat dissipation path) through which heat generated by the wavelength conversion member 16 passes. Filled. Accordingly, the first heat radiation path through which heat generated by the wavelength conversion member 16 passes (the wavelength conversion member 16 → the member 32 having a higher thermal conductivity than the ambient air (for example, a white resin having a relatively high reflectance) → the metal member 20 → A ferrule 14) is constructed. Accordingly, the heat generated by the wavelength conversion member 16 passes in the order of the member 32 having a higher thermal conductivity than the surrounding air (for example, a white resin having a relatively high reflectance) → the metal member 20 → the ferrule 14, and the surrounding air from the ferrule 14. The heat is dissipated.

  Moreover, the light emitted from the wavelength conversion member 16 is reflected by the white resin by using a white resin having a relatively high reflectance as the member 32 having a higher thermal conductivity than the ambient air filling the gap S3. Therefore, the extraction efficiency of light emitted from the wavelength conversion member 16 through the opening 30a (large diameter portion 30f) and the transparent plate 34 is improved.

  The distal end portion of the ferrule 14 is inserted into the cylindrical portion 28 of the metal member 20 until the distal end surface 14a (the light exit surface 12b of the light guide 12) abuts against the plate portion 30 (wavelength conversion member 16) of the metal member 20. It is mated. The metal member 20 and the ferrule 14 are fixed by a known means such as an adhesive or welding.

  Thereby, the wavelength conversion member 16 is sandwiched between the transparent plate 34 and the light output surface 12 b of the light guide 12 in a state where the wavelength conversion member 16 covers the light output surface 12 b of the light guide 12. That is, the wavelength conversion member 16 is sandwiched between the transparent plate 34 and the light exit surface 12 b of the light guide 12 in a state where it is in contact with the transparent plate 34. The wavelength conversion member 16 and the light exit surface 12b of the light guide 12 are preferably fixed by an adhesive such as a transparent resin that transmits the excitation light from the excitation light source 24.

  As described above, since the wavelength conversion member 16 is sandwiched between the transparent plate 34 and the light output surface 12b of the light guide 12, vibration, impact, etc. (for example, vibration of the vehicle on which the light emitting device 10A is mounted) It is possible to prevent the wavelength conversion member 16 from falling off the light exit surface 12b of the light guide 12 due to impact or the like (fail safe).

  Further, the transparent plate 34 comes into contact with the surface 16c of the wavelength conversion member 16 so that the heat generated by the wavelength conversion member 16 passes through the second heat radiation path (wavelength conversion member 16 → transparent plate 34 → metal member 20 → ferrule 14). Is configured.

  Accordingly, the heat generated by the wavelength conversion member 16 passes in the order of contact between the transparent plate 34 and the wavelength conversion member 16 (surface 16c) → transparent plate 34 → ferrule 14 and is fixed to the ferrule 14 (or the ferrule 14). The heat is dissipated from the heat sink fins) to the surrounding air.

  The heat of the wavelength conversion member 16 can be efficiently radiated by the action of the first and second heat radiation paths. As a result, the light emission efficiency of the light emitting device 10B can be improved.

  In order to further enhance the heat dissipation effect, it is desirable to provide heat dissipation fins on the metal member 20 (and / or ferrule 14) or to fix the heat sink to the metal member 20 (and / or ferrule 14).

  In the light emitting device 10B having the above-described configuration, the excitation light from the excitation light source 24 is introduced into the light guide 12 from the light incident surface 12a of the light guide 12, guided to the light output surface 12b, and emitted from the light output surface 12b. The wavelength conversion member 16 is irradiated.

  The wavelength conversion member 16 irradiated with the excitation light is excited by the excitation light (scattered light) from the excitation light source 24 scattered on the surface (and / or inside) and the excitation light incident from the excitation light source 24 and emitted light. White light (pseudo white light) due to color mixture with light from the conversion member 16 is emitted.

  The wavelength conversion member 16 has a size that is the same as or slightly larger than the light exit surface 12 b of the light guide 12. Therefore, it is possible to prevent the occurrence of color unevenness caused by the excitation light emitted from the light exit surface 12b of the light guide 12 being guided inside the wavelength conversion member 16. Therefore, the light emitting device 10B in which the wavelength conversion member 16 emits light uniformly without color unevenness can be configured.

  As described above, according to the light emitting device 10B of the present embodiment, since the wavelength conversion member 16 is sandwiched between the transparent plate 34 and the light exit surface 12b of the light guide 12, vibration or impact (for example, It is possible to prevent the wavelength conversion member 16 from falling off the light exit surface 12b of the light guide 12 due to vibrations / impacts of the vehicle on which the light emitting device 10B is mounted (fail safe).

  Further, according to the light emitting device 10B of the present embodiment, the heat generated by the wavelength conversion member 16 can be efficiently radiated by the action of the first and second heat radiation paths. As a result, the light emission efficiency of the light emitting device 10B can be improved. Note that the first heat radiation path can be omitted.

As described above, according to the light emitting device 10B of the present embodiment, the wavelength conversion member 16 is prevented from falling off, and a light emitting device with high light emission efficiency can be configured.
[Configuration example of vehicle lamp unit]
Next, a configuration example of a vehicular lamp unit (a vehicular lamp such as a vehicular headlamp) using the light emitting device 10 having the above configuration will be described.

  FIG. 5 is a longitudinal sectional view of the vehicular lamp unit 36 using the light emitting device 10.

  The vehicle lamp unit 36 shown in FIG. 5 is a so-called direct projection type (direct-light type) vehicle lamp unit, and includes a projection lens 38 and a light emitting device 10. Instead of the light emitting device 10, the light emitting devices 10A and 10B may be used.

  The projection lens 38 is, for example, a planoconvex aspherical projection lens having a convex surface on the front side of the vehicle and a flat surface on the rear side of the vehicle.

  The wavelength conversion member 16 of the light emitting device 10 is disposed at the rear focal point F of the projection lens 38 with its light emitting surface facing the projection lens 38.

  According to the vehicular lamp unit 36 having the above-described configuration, the light emitted from the wavelength conversion member 16 is transmitted forward through the projection lens 38, and is a virtual vertical screen (for example, about the front of the vehicle) facing the front of the vehicle. A predetermined light distribution pattern (for example, a high-beam light distribution pattern) is formed on the second light distribution pattern.

  The example in which the direct projection type (direct-lighting type) vehicle lamp unit 36 is configured using the light emitting devices 10, 10 </ b> A, and 10 </ b> B has been described above, but the present invention is not limited thereto. For example, by using the light emitting devices 10, 10A, and 10B, a reflector-type (reflective) vehicle lamp unit or projection lens including a paraboloidal reflecting surface, or a projector-type vehicle including a spheroid reflecting surface. It is also possible to configure a lamp unit.

  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, 10A, 10B ... Light-emitting device, 12 ... Light guide, 12a ... Light incident surface, 12b ... Light emission surface, 14 ... Ferrule, 14a ... Front end surface, 14b ... Base end surface, 14c ... Through hole for light guide, 16 ... Wavelength Conversion member, 16a, 16b ... part, 16c ... front surface, 16d ... back surface, 18 ... light source unit, 20 ... metal member, 22 ... holder, 22a ... through hole for light guide, 24 ... excitation light source, 26 ... condensing lens, 28 ... cylindrical portion, 30 ... plate portion, 30a ... opening, 30b ... large diameter portion, 30c ... small diameter portion, 30d ... step portion, 30e ... small diameter portion, 30f ... large diameter portion, 30g ... step portion, 32 ... member, 34 ... Transparent plate

Claims (6)

A light guide that includes a light incident surface and a light exit surface, guides excitation light introduced from the light incident surface to the light exit surface, and emits the light from the light exit surface;
A holding member for holding the light guide;
An excitation light source for generating excitation light introduced into the light guide from the light incident surface;
The cylindrical portion that fits the holding member and the plate portion that closes the open end at the tip of the cylindrical portion, and the light exit surface of the light guide held by the holding member fitted to the cylindrical portion is opposed to each other A plate member in which an opening having substantially the same size as the light exit surface is formed, and a metal member including:
A wavelength conversion member that absorbs excitation light emitted from the light exit surface, converts the wavelength to emit light in a predetermined wavelength range, and
With
The wavelength conversion member is configured such that at least a part of the wavelength conversion member is exposed from the opening, and the wavelength conversion member covers the light output surface, and the light guide surface of the plate portion of the metal member and the light guide. A light-emitting device characterized by being sandwiched between the two.   The wavelength conversion member is in a state where the periphery of the opening in the plate portion of the metal member is in contact with the outer peripheral portion of the surface of the wavelength conversion member, and the outer peripheral portion of the back surface of the wavelength conversion member is in contact with the holding member. The light emitting device according to claim 1, wherein the light emitting device is sandwiched between a plate portion of the metal member and the light exit surface.   The light emitting device according to claim 1, wherein the opening is a tapered opening. A light guide that includes a light incident surface and a light exit surface, guides excitation light introduced from the light incident surface to the light exit surface, and emits the light from the light exit surface;
A holding member for holding the light guide;
An excitation light source for generating excitation light introduced into the light guide from the light incident surface;
A wavelength conversion member that absorbs excitation light emitted from the light exit surface, converts the wavelength to emit light in a predetermined wavelength range, and
A transparent plate fixed to the holding member;
With
The light emitting device, wherein the wavelength conversion member is sandwiched between the transparent plate and the light output surface in a state where the wavelength conversion member covers the light output surface. A light guide that includes a light incident surface and a light exit surface, guides excitation light introduced from the light incident surface to the light exit surface, and emits the light from the light exit surface;
A holding member for holding the light guide;
An excitation light source for generating excitation light introduced into the light guide from the light incident surface;
The cylindrical portion that fits the holding member and the plate portion that closes the open end at the tip of the cylindrical portion, and the light exit surface of the light guide held by the holding member fitted to the cylindrical portion is opposed to each other A plate member in which an opening having substantially the same size as the light exit surface is formed, and a metal member including:
A wavelength conversion member that absorbs excitation light emitted from the light exit surface, converts the wavelength to emit light in a predetermined wavelength range, and
A transparent plate fixed to the metal member in a state of covering the opening;
With
The light emitting device, wherein the wavelength conversion member is sandwiched between the transparent plate and the light output surface in a state where the wavelength conversion member covers the light output surface.   A vehicle lamp comprising the light-emitting device according to claim 1.

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