JP2010147196A - Light-emitting module and lighting device unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting module achieving high light intensity. <P>SOLUTION: In a light-emitting module 40, a first semiconductor light-emitting element 48 and a second semiconductor light-emitting element 50 are provided so as to mainly emit a blue light Lb of the blue light Lb and yellow light Ly in which the composite light of both the lights is white. An optical wavelength conversion member 52 is provided so as to convert a wavelength of the main blue light Lb emitted by the second semiconductor light-emitting element 50 and to mainly emit the yellow light Ly of the blue light Lb and yellow light Ly in which the composite light of both the lights is white. An optical filter 54 emits a composite white light Lw as a composite light of both the lights by passing through the main blue light Lb emitted by the first semiconductor light-emitting element 48 and reflecting the yellow light Ly emitted from the light wavelength conversion member 52. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light emitting module and a lamp unit including the light emitting module.

2. Description of the Related Art In recent years, for the purpose of extending life and reducing power consumption, a technology using a light emitting module having a light emitting element such as an LED (Light Emitting Diode) as a light source for irradiating strong light such as a lamp unit that irradiates light in front of the vehicle. Development is underway. However, in order to use in such applications, the light emitting module is required to have high luminance and high luminous intensity. For this reason, for example, in order to improve the extraction efficiency of white light, a light emitting element that mainly emits blue light, a yellow phosphor that emits mainly yellow light when excited by blue light, and blue light is transmitted from the light emitting element. An illuminating device has been proposed that includes blue-transmitting yellow-based reflecting means that reflects light having a wavelength equal to or greater than that of yellow light from a yellow-based phosphor (see, for example, Patent Document 1).
JP 2007-59864 A

  The technique described in the above-mentioned patent document aims to improve the extraction efficiency of white light from a single light emitting element. However, in order to realize a light-emitting module that can be used for a lamp unit that irradiates light in front of the vehicle as described above, a single light-emitting element may have insufficient light quantity. On the other hand, for example, when a plurality of light emitting elements are arranged in parallel to increase the luminous intensity as a whole, there is a possibility that the projected image is affected by the dispersion of the light sources.

  In addition, a light-emitting element such as the above-described LED may be provided to emit light having a specific wavelength. In order to irradiate light of a color different from the color of light emitted from the light emitting element with high luminous intensity using such a light emitting element, a plurality of light emitting devices provided to emit light having specific wavelengths different from each other. A mode in which light emitted from each of the elements is synthesized and irradiated is conceivable. However, control of lighting and extinguishing of a plurality of types of light emitting elements having different colors of emitted light tends to be complicated. In addition, when a plurality of types of light emitting elements are used as described above, it is difficult to reduce the cost of the light emitting elements due to an increase in the number of production as compared with the case where all the common light emitting elements are used.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a light emitting module capable of realizing high luminous intensity.

  In order to solve the above problems, a light emitting module according to an aspect of the present invention includes a first light emitting element that mainly emits light in a certain range of wavelengths, and a second light that mainly emits light in a wavelength that is substantially in the same range as the first light emitting element. A light emitting element, a light wavelength converting member that converts the wavelength of light emitted from the second light emitting element, and emits light; a light having a main wavelength emitted from the first light emitting element; and a light having a main wavelength emitted from the light wavelength converting member. An optical filter that transmits one of the lights and reflects the other, thereby emitting combined light of the two lights.

  According to this aspect, since the combined light is first emitted using the two light emitting elements, it is possible to increase the luminous intensity of the emitted light while avoiding dispersion of the light source. In addition, it is possible to emit combined light using a plurality of light emitting elements that mainly emit light having a wavelength in substantially the same range. For this reason, compared with the case where a plurality of light emitting elements that mainly emit light of different wavelengths are used, lighting control of the light emitting elements can be facilitated, and the light emitting elements can be shared.

  The first light emitting element is provided so as to mainly emit one of the light having the first wavelength and the light having the second wavelength in which both combined lights are white, and the light wavelength conversion member has the wavelength of the light emitted from the second light emitting element. It may be provided to convert and mainly emit the other of the first wavelength light and the second wavelength light.

  According to this aspect, white light can be emitted using a plurality of light emitting elements that mainly emit light having a wavelength in a certain range. For this reason, for example, a light emitting module can be used for a lamp unit included in a vehicle headlamp, and a light emitting module applicable to a wide variety of uses can be provided.

  Note that both the first light emitting element and the second light emitting element may mainly emit light having a blue wavelength. The light wavelength conversion member may mainly emit light having a yellow wavelength by converting the wavelength of blue light. The optical filter may emit white combined light, which is a combined light of both lights, by transmitting light having a blue wavelength and reflecting light having a yellow wavelength. Alternatively, the optical filter may emit white combined light, which is a combined light of both lights, by reflecting light having a blue wavelength and transmitting light having a yellow wavelength.

  The light emitting module of an aspect of the present invention may further include a reflective surface. The second light emitting element is disposed on the same plane as the first light emitting element, and the optical filter is disposed at a position where one of the light emitted from the first light emitting element and the light emitted from the light wavelength conversion member is incident. The reflection surface may be arranged to reflect the other of the light emitted from the first light emitting element and the light emitted from the light wavelength conversion member toward the emission surface of the optical filter.

  According to this aspect, it is possible to arrange the first light emitting element and the second light emitting element on the same plane. For this reason, when both the 1st light emitting element and the 2nd light emitting element are comprised by LED, for example, since both can be arrange | positioned on the same board | substrate, the structure of a board | substrate can be simplified.

  Another embodiment of the present invention is also a light emitting module. The light-emitting module includes a first light-emitting element that mainly emits light in a certain range of wavelengths, a first light wavelength conversion member that converts the wavelength of light emitted from the first light-emitting element, and substantially the same range as the first light-emitting element. A second light emitting element that mainly emits light of a wavelength of wavelength, and wavelength conversion of light emitted from the second light emitting element to mainly emit light having a wavelength different from the main wavelength of light emitted from the first light wavelength conversion member. The second light wavelength conversion member, the light having the main wavelength emitted from the first light wavelength conversion member, and the light having the main wavelength emitted from the second light wavelength conversion member, and transmitting the other. And an optical filter that emits combined light of both lights by reflection.

  According to this aspect, light of various colors can be obtained depending on the setting state of the wavelength of the light emitted by the first light wavelength conversion member and the wavelength of the light converted by the second light wavelength conversion member. The light can be emitted. For this reason, it becomes possible to provide the light emitting module applicable to a wide use.

  The first light emitting element and the second light emitting element may mainly emit ultraviolet light. Such an optical wavelength conversion member generally converts the wavelength into light having a longer wavelength. For this reason, if the incident light is ultraviolet light having a shorter wavelength than visible light, the wavelength of the light emitted from the light wavelength conversion member can be set widely within the range of visible light. For this reason, it becomes possible to emit light of various colors.

  Yet another embodiment of the present invention is a lamp unit. The lamp unit includes a first light emitting element that mainly emits light of a certain range of wavelengths, a second light emitting element that mainly emits light of a wavelength in substantially the same range as the first light emitting element, and light emitted by the second light emitting element. By transmitting one of the light wavelength conversion member to be converted and emitted, the light having the main wavelength emitted from the first light emitting element and the light having the main wavelength emitted from the light wavelength conversion member, and reflecting the other And a light emitting module having an optical filter that emits combined light of both lights, and an optical member that collects the light emitted from the light emitting module.

  According to this aspect, it is possible to provide a lamp unit that uses a light-emitting module with high luminous intensity. Therefore, it is possible to provide a lamp unit that is applied to various uses that require high-luminance light such as a vehicle headlamp.

  Yet another embodiment of the present invention is also a lamp unit. The lamp unit includes a first light emitting element that mainly emits light in a certain range of wavelengths, a first light wavelength conversion member that converts the wavelength of the light emitted from the first light emitting element, and the substantially same range as the first light emitting element. A second light emitting element that mainly emits light having a wavelength of the first light, and a second light that mainly emits a wavelength different from the main wavelength of the light emitted from the first light wavelength conversion member by converting the wavelength of the light emitted by the second light emitting element. Transmitting one of the two light wavelength conversion members, the light having the main wavelength emitted from the first light wavelength conversion member, and the light having the main wavelength emitted from the second light wavelength conversion member, and reflecting the other. Thus, a light emitting module having an optical filter that emits combined light of both lights, and an optical member that collects the light emitted from the light emitting module are provided.

  Also in this aspect, it is possible to provide a lamp unit that uses a light emitting module with high luminous intensity. Therefore, it is possible to provide a lamp unit that is applied to various uses that require high-luminance light such as a vehicle headlamp.

  ADVANTAGE OF THE INVENTION According to this invention, the light emitting module which can implement | achieve high luminous intensity can be provided.

  Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration of a vehicle headlamp 10 according to the first embodiment. The vehicle headlamp 10 includes a lamp body 12, a front cover 14, and a lamp unit 16. Hereinafter, the left side in FIG. 1 will be described as the front of the lamp, and the right side will be described as the rear of the lamp. Further, the right side of the lamp in front of the lamp is called the right side of the lamp, and the left side is called the lamp left side. FIG. 1 shows a cross section of a vehicle headlamp 10 cut by a vertical plane including the optical axis of the lamp unit 16 as viewed from the left side of the lamp. When the vehicle headlamp 10 is mounted on the vehicle, the vehicle headlamps 10 formed symmetrically with each other are provided on the vehicle left front and right front, respectively. FIG. 1 shows the configuration of the left or right vehicle headlamp 10.

  The lamp body 12 is formed in a box shape having an opening. The front cover 14 is formed in a bowl shape with a translucent resin or glass. The front cover 14 has an edge attached to the opening of the lamp body 12. In this way, a lamp chamber is formed in an area covered by the lamp body 12 and the front cover 14.

  A lamp unit 16 is disposed in the lamp chamber. The lamp unit 16 is fixed to the lamp body 12 by an aiming screw 18. The lower aiming screw 18 is configured to rotate when the leveling actuator 20 is operated. For this reason, it is possible to move the optical axis of the lamp unit 16 in the vertical direction by operating the leveling actuator 20.

  The lamp unit 16 includes a projection lens 30, a support member 32, a reflector 34, a bracket 36, a light emitting module substrate 38, and heat radiating fins 42. The projection lens 30 is a plano-convex aspheric lens having a convex front surface and a flat rear surface, and projects a light source image formed on the rear focal plane as a reverse image to the front of the lamp. The support member 32 supports the projection lens 30. A light emitting module 40 is provided on the light emitting module substrate 38. The reflector 34 reflects light from the light emitting module 40 and forms a light source image on the rear focal plane of the projection lens 30. Thus, the reflector 34 and the projection lens 30 function as an optical member that condenses the light emitted from the light emitting module 40 toward the front of the lamp. The radiation fins 42 are attached to the rear surface of the bracket 36 and mainly radiate heat generated by the light emitting module 40.

  The support member 32 is formed with a shade 32a. The vehicle headlamp 10 is used as a low beam light source, and the shade 32a blocks a part of the light emitted from the light emitting module 40 and reflected by the reflector 34, so that the cut-off line in the low beam light distribution pattern in front of the vehicle. Form. Since the low beam light distribution pattern is known, the description thereof is omitted.

  FIG. 2 is a diagram illustrating a configuration of the light emitting module substrate 38 according to the first embodiment. The light emitting module substrate 38 includes a light emitting module 40, a substrate 44, and a transparent cover 46. The substrate 44 is a printed wiring board, and the light emitting module 40 is attached to the upper surface. The light emitting module 40 is covered with a colorless transparent cover 46, and the inside is hollow.

  The light emitting module 40 includes a first semiconductor light emitting element 48, a second semiconductor light emitting element 50, a light wavelength conversion member 52, an optical filter 54, a support substrate 56, and a support member 58. The first semiconductor light emitting element 48 is attached to the substrate 44. The optical filter 54 is formed in a plate shape, and is fixed to the substrate 44 via the support member 58 so as to be disposed in an inclined state above the first semiconductor light emitting element 48. The second semiconductor light emitting element 50 is fixed to the substrate 44 via the support substrate 56 so that the posture of emitting light in the horizontal direction toward the optical filter 54 is maintained in a state where the second semiconductor light emitting device 50 is vertically set. The light wavelength conversion member 52 is attached to the light emitting surface of the second semiconductor light emitting element 50.

  FIG. 3 is a diagram illustrating a configuration of the light emitting module 40 according to the first embodiment. The first semiconductor light emitting device 48 is arranged such that the light emitting surface 48a is horizontal. The second semiconductor light emitting device 50 is disposed above the first semiconductor light emitting device 48 so that the light emitting surface 50 a is perpendicular to the light emitting surface 48 a of the first semiconductor light emitting device 48. Since the light wavelength conversion member 52 is attached to the light emitting surface 50 a of the second semiconductor light emitting element 50, the emission surface 52 a of the light wavelength conversion member 52 and the light emitting surface 48 a of the first semiconductor light emitting element 48 are perpendicular to each other.

  The first semiconductor light emitting element 48 is constituted by an LED element. In the first embodiment, a blue LED that mainly emits light having a blue wavelength is employed as the first semiconductor light emitting element 48. Specifically, the first semiconductor light emitting element 48 is configured by an InGaN-based LED element formed by crystal growth of an InGaN-based semiconductor layer on a sapphire substrate. The first semiconductor light emitting element 48 is formed as a 1 mm square chip, for example, and is provided so that the center wavelength of the emitted blue light Lb is 470 nm. Of course, the configuration of the first semiconductor light emitting element 48 and the wavelength of the emitted light are not limited to those described above. The second semiconductor light emitting element 50 is the same as the first semiconductor light emitting element 48 and mainly emits the same blue light Lb as the first semiconductor light emitting element 48.

  The light wavelength conversion member 52 is a so-called luminescent ceramic or fluorescent ceramic, and sinters a ceramic substrate made of YAG (Yttrium Aluminum Garnet) powder, which is a phosphor excited by blue light. Can be obtained. Since the manufacturing method of such a light wavelength conversion ceramic is well-known, detailed description is abbreviate | omitted.

  When the light wavelength conversion member 52 thus obtained is attached to the light emitting surface of the second semiconductor light emitting device 50, the wavelength of the blue light Lb mainly emitted from the second semiconductor light emitting device 50 is converted to emit yellow light Ly. To do. The light wavelength conversion member 52 according to the first embodiment has a relatively high phosphor content so that the blue light Lb emitted from the second semiconductor light emitting element 50 is converted into yellow light Ly with a high probability. Is used.

  As described above, the first semiconductor light emitting device 48 is provided so as to mainly emit the blue light Lb among the blue light Lb and the yellow light Ly in which both combined lights are white. On the other hand, the light wavelength conversion member 52 is provided so as to mainly convert the light emitted by the second semiconductor light emitting element 50 to emit mainly the yellow light Ly out of the blue light Lb and the yellow light Ly in which both combined lights become white. It is done.

  The light wavelength conversion member 52 is transparent. In the first embodiment, “transparent” means that the total light transmittance of light in the conversion wavelength region is 40% or more. As a result of inventor's earnest research and development, if the total light transmittance of light in the conversion wavelength region is in a transparent state of 40% or more, the light wavelength by the light wavelength conversion member 52 can be appropriately converted and the light wavelength It has been found that a decrease in the intensity of light passing through the conversion member 52 can also be appropriately suppressed. Therefore, the light emitted from the first semiconductor light emitting element 48 can be more efficiently converted by making the light wavelength conversion member 52 transparent. The light wavelength conversion member 52 is not transparent, but may be translucent.

  Further, the light wavelength conversion member 52 is made of a binderless inorganic material, and the durability is improved as compared with a case where an organic material such as a binder is contained. For this reason, for example, it is possible to supply 1 W (watt) or more of power to the light emitting module 40, and it is possible to increase the luminance and luminous intensity of the light emitted from the light emitting module 40.

  The optical filter 54 is disposed above the first semiconductor light emitting device 48 so as to form an angle of 45 degrees with respect to each of the light emitting surface 48 a of the first semiconductor light emitting device 48 and the light emitting surface 52 a of the light wavelength conversion member 52. At this time, the surface illuminated by the light emitted from the first semiconductor light emitting element 48 becomes the incident surface 54a, and the surface illuminated by the light emitted from the light wavelength conversion member 52 becomes the emission surface 54b.

  The optical filter 54 is configured by a dichroic mirror formed into a multilayer film by alternately depositing and laminating materials having different refractive indexes on one surface of the light wavelength conversion member 52. In the first embodiment, the optical filter 54 is provided so as to transmit the blue light Lb and reflect the yellow light Ly. Needless to say, the optical filter 54 is not limited to the above-described one, and, for example, a long-pass filter, a short-pass filter, or a band-pass filter may be employed.

  Since the optical filter 54 is inclined at the above-described angle, the optical filter 54 transmits the blue light Lb emitted from the first semiconductor light emitting element 48 and is emitted from the light wavelength conversion member 52 toward the direction of emission from the emission surface 54b. The emitted yellow light Ly is reflected by the emission surface 54b. Therefore, the emission surface 54b of the optical filter 54 emits the combined white light Lw that is the combined light of both the blue light Lb and the yellow light Ly. Accordingly, since the combined light is first emitted using the two light emitting elements, the luminous intensity of the light emitted from the light emitting module 40 can be increased. In addition, the first semiconductor light emitting device 48 and the second semiconductor light emitting device 50 can be shared.

  The first semiconductor light emitting device 48 may be one that mainly emits light having a wavelength other than blue. Also in this case, the light wavelength conversion member 52 that converts the wavelength of the main light emitted from the first semiconductor light emitting element 48 is employed. Even in this case, the light wavelength conversion member 52 is combined with light having a wavelength mainly emitted by the first semiconductor light emitting element 48 so that the first semiconductor light emitting element 48 becomes light having a wavelength of white or a color close to white. The wavelength of the emitted light may be converted.

  In the first embodiment, “transmitting” means that the luminous intensity after transmission is 50% or more than the luminous intensity before transmission. Further, “reflect” means that the luminous intensity after reflection is 50% or more than the luminous intensity before reflection.

(Second Embodiment)
FIG. 4 is a diagram illustrating a configuration of a light emitting module 60 according to the second embodiment. The configuration of the vehicular headlamp 10 is the same as that of the first embodiment except that a light emitting module 60 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The light emitting module 60 includes a first semiconductor light emitting element 48, a second semiconductor light emitting element 50, and a filter unit 62. In the second embodiment, the mounting position of the first semiconductor light emitting element 48 is the same as in the first embodiment. The second semiconductor light emitting element 50 is the same as the first embodiment in the mounting position and the like except that the light wavelength conversion member 52 is not mounted.

  The filter unit 62 includes an optical filter 54 and an optical wavelength conversion member 64. The light wavelength conversion member 64 is formed of the same material as the light wavelength conversion member 52 according to the first embodiment, and is provided as a transparent plate-like member including a phosphor that converts the wavelength of incident light.

  The optical filter 54 is made of quartz. The optical filter 54 is attached to one surface of the light wavelength conversion member 64. The optical filter 54 may be deposited on the filter unit 62, or the optical filter 54 formed in a plate shape may be attached to one surface of the filter unit 62.

  In the filter unit 62, the optical filter 54 forms an angle of 45 degrees with respect to the light emitting surface 48 a of the first semiconductor light emitting device 48, and the light wavelength conversion member 64 is relative to the light emitting surface 50 a of the second semiconductor light emitting device 50. The first semiconductor light emitting device 48 is disposed above the first semiconductor light emitting device 48 so as to form an angle of 45 degrees. At this time, the surface of the optical filter 54 illuminated by the light emitted from the first semiconductor light emitting element 48 becomes the incident surface 54a, and the surface of the light wavelength conversion member 64 illuminated by the light emitted from the light wavelength conversion member 52 is the emission surface. 64a.

  The optical filter 54 transmits the blue light Lb emitted from the first semiconductor light emitting element 48 and enters the light wavelength conversion member 64. The light wavelength conversion member 64 converts part of the blue light Lb emitted from the first semiconductor light emitting element 48 to yellow light Ly, and emits the resultant white light Lw from the emission surface 64a. Further, the light wavelength conversion member 64 converts part of the blue light Lb emitted from the second semiconductor light emitting element 50 into yellow light Ly. The light emitted from the second semiconductor light emitting element 50 is reflected by the emission surface 54b of the optical filter 54 and is emitted from the emission surface 64a of the light wavelength conversion member 64 as synthetic white light Lw.

  At this time, since the optical filter 54 is inclined and arranged at the above-described angle, the blue light emitted from the light wavelength conversion member 52 toward the direction of transmitting the blue light Lb emitted from the first semiconductor light emitting element 48 is used. The synthetic white light Lw based on the light Lb is reflected by the emission surface 54b. Therefore, the emission surface 64a of the light wavelength conversion member 64 is subjected to wavelength conversion of the synthetic white light Lw obtained by wavelength conversion of the blue light Lb emitted from the first semiconductor light emitting device 48 and the blue light Lb emitted from the second semiconductor light emitting device 50. The synthesized white light Lw, which is both synthesized light with the synthesized white light Lw, is emitted. Also in such an aspect, the synthetic white light Lw can be emitted using two semiconductor light emitting elements, and it becomes possible to emit white light with high luminous intensity.

(Third embodiment)
FIG. 5 is a diagram illustrating a configuration of a light emitting module 80 according to the third embodiment. The configuration of the vehicular headlamp 10 is the same as that of the first embodiment except that a light emitting module 80 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The light emitting module 80 includes a first semiconductor light emitting element 48, a second semiconductor light emitting element 50, an optical wavelength conversion member 52, and a filter unit 82. The filter unit 82 includes a prism 84 and an optical filter 54. The prism 84 is formed in a triangular prism shape whose cross section is a right-angled isosceles triangle, and the optical filter 54 is attached to an attached surface 84a that forms an angle of 45 degrees with the other two surfaces. The prism 84 is arranged such that one of two surfaces that form a right angle faces the emission surface 52a of the light wavelength conversion member 52 and the other is the horizontal upper surface. Accordingly, the optical filter 54 is disposed so as to form an angle of 45 degrees with respect to both the light emitting surface 48a of the first semiconductor light emitting element 48 and the light emitting surface 52a of the light wavelength conversion member 52, as in the first embodiment. Is done.

  Thereby, the optical filter 54 transmits the yellow light Ly emitted from the light wavelength conversion member 52 toward the direction of transmitting the blue light Lb emitted from the first semiconductor light emitting element 48 and exiting from the emission surface 54b. Reflect on. Therefore, the emission surface 54b of the optical filter 54 emits the combined white light Lw that is the combined light of both the blue light Lb and the yellow light Ly. Even when the prism 84 is used in this manner, the combined white light Lw can be emitted using two semiconductor light emitting elements, and white light with high luminous intensity can be emitted.

(Fourth embodiment)
FIG. 6 is a diagram illustrating a configuration of a light emitting module 100 according to the fourth embodiment. The configuration of the vehicle headlamp 10 is the same as that of the first embodiment except that the light emitting module 100 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The light emitting module 100 includes a first semiconductor light emitting element 48, a second semiconductor light emitting element 50, an optical wavelength conversion member 52, and a filter unit 102. In the fourth embodiment, the first semiconductor light emitting device 48 and the second semiconductor light emitting device 50 are both disposed on the same surface of the substrate 44. Thereby, compared with the case where the 1st semiconductor light-emitting device 48 and the 2nd semiconductor light-emitting device 50 are mutually arrange | positioned at right angle, the structure of the board | substrate 44 etc. can be simplified.

  The filter unit 102 includes a first prism 104, a second prism 106, and an optical filter 54. The first prism 104 is formed in a quadrangular prism shape having a parallelogram-shaped cross section in which an angle between two of the four corners is 45 degrees. One surface of the optical filter 54 is attached to one surface of the first prism 104. In the first prism 104, the reflecting surface 104a facing the attached surface 104b is provided so as to reflect the light passing through the first prism 104. The second prism 106 is formed in a triangular prism shape whose cross section is a right-angled isosceles triangle, and is attached to the first prism 104 of the optical filter 54 on a mounted surface 106a that forms an angle of 45 degrees with the other two surfaces. The opposite side of the surface is attached.

  The filter unit 102 is disposed above the first semiconductor light emitting element 48 and is disposed such that the reflection surface 104 a is located above the second semiconductor light emitting element 50 and the light wavelength conversion member 52. Therefore, the first semiconductor light emitting element 48 emits blue light Lb toward the incident surface 54a of the optical filter 54, and the light wavelength conversion member 52 emits yellow light Ly toward the reflecting surface 104a.

  The optical filter 54 transmits the blue light Lb emitted from the first semiconductor light emitting element 48 and emits it from the emission surface 54b. The reflection surface 104 a reflects the yellow light Ly emitted from the light wavelength conversion member 52 toward the emission surface 54 b of the optical filter 54. The emission surface 54b of the optical filter 54 further reflects the yellow light Ly reflected by the reflection surface 104a.

  Since the optical filter 54 is disposed to be inclined at the above-described angle and the reflecting surface 104a is provided to be inclined at the above-described angle, the optical filter 54 emits the blue light Lb emitted from the first semiconductor light emitting element 48. The yellow light Ly emitted from the light wavelength conversion member 52 is reflected by the emission surface 54b toward the direction of transmission and emission from the emission surface 54b. Therefore, the emission surface 54b of the optical filter 54 emits the combined white light Lw that is the combined light of both the blue light Lb and the yellow light Ly.

  As described above, also in the fourth embodiment, it is possible to emit the synthetic white light Lw using two semiconductor light emitting elements, and to emit white light with high luminous intensity. Further, by using the first prism 104 and the second prism 106, it is possible to improve the mounting accuracy of the optical filter 54 and the like, and it is possible to appropriately emit the synthetic white light Lw.

(Fifth embodiment)
FIG. 7 is a diagram illustrating a configuration of a light emitting module 120 according to the fifth embodiment. The configuration of the vehicle headlamp 10 is the same as that of the first embodiment except that the light emitting module 120 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The light emitting module 120 includes a first semiconductor light emitting element 122, a second semiconductor light emitting element 124, a first light wavelength conversion member 126, a second light wavelength conversion member 128, and an optical filter 54. The first semiconductor light emitting element 122 and the second semiconductor light emitting element 124 are provided so as to mainly emit ultraviolet light that is light having a wavelength in the ultraviolet region.

  The first semiconductor light emitting element 122 is disposed such that the light emitting surface 122a is horizontal. The second semiconductor light emitting device 124 is disposed above the first semiconductor light emitting device 122 so that the light emitting surface 124a and the light emitting surface 122a of the first semiconductor light emitting device 122 are perpendicular to each other. The first light wavelength conversion member 126 is formed in a plate shape and is attached to the light emitting surface 122 a of the first semiconductor light emitting element 122. The second light wavelength conversion member 128 is also formed in a plate shape and attached to the light emitting surface 124 a of the second semiconductor light emitting element 124. Therefore, the emission surface 126a of the first light wavelength conversion member 126 and the emission surface 128a of the second light wavelength conversion member 128 are perpendicular to each other.

  The first light wavelength conversion member 126 is provided to convert the wavelength of ultraviolet light mainly emitted from the first semiconductor light emitting element 122 and emit blue light Lb. The second light wavelength conversion member 128 is provided so as to convert the wavelength of ultraviolet light mainly emitted from the second semiconductor light emitting element 124 and emit yellow light Ly. The first light wavelength conversion member 126 and the second light wavelength conversion member 128 are so-called luminescent ceramics or fluorescent ceramics, and sinter a ceramic base made using a phosphor powder excited by ultraviolet light. By doing so, each can be obtained. The first light wavelength conversion member 126 and the second light wavelength conversion member 128 are transparent. In addition, although the 1st light wavelength conversion member 126 and the 2nd light wavelength conversion member 128 are not transparent, they may have translucency.

  Moreover, each of the 1st light wavelength conversion member 126 and the 2nd light wavelength conversion member 128 is comprised with the inorganic substance of binderless, and the improvement of durability is achieved compared with the case where organic substances, such as a binder, are contained. For this reason, for example, it is possible to supply 1 W (watt) or more of power to the light emitting module 40, and it is possible to increase the luminance and luminous intensity of the light emitted from the light emitting module 40.

  The optical filter 54 is disposed above the first semiconductor light emitting element 48 so as to form an angle of 45 degrees with respect to each of the emission surface 126a of the first light wavelength conversion member 126 and the emission surface 128a of the second light wavelength conversion member 128. Is done. At this time, the surface illuminated by the light emitted from the first semiconductor light emitting element 48 becomes the incident surface 54a, and the surface illuminated by the light emitted from the light wavelength conversion member 52 becomes the emission surface 54b.

  Since the optical filter 54 is inclined at the above-described angle, the second light wavelength is directed toward the direction of transmitting the blue light Lb emitted from the first light wavelength conversion member 126 and exiting from the emission surface 54b. The yellow light Ly emitted from the conversion member 128 is reflected by the emission surface 54b. Therefore, the emission surface 54b of the optical filter 54 emits the combined white light Lw that is the combined light of both the blue light Lb and the yellow light Ly. As described above, also in the fifth embodiment, the combined white light Lw can be emitted using two semiconductor light emitting elements, and white light with high luminous intensity can be emitted.

(Sixth embodiment)
FIG. 8 is a diagram illustrating a configuration of a light emitting module 140 according to the sixth embodiment. The configuration of the vehicle headlamp 10 is the same as that of the first embodiment except that the light emitting module 140 is provided instead of the light emitting module 40. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The light emitting module 140 includes a first semiconductor light emitting element 122, a second semiconductor light emitting element 124, and a filter unit 142. The first semiconductor light emitting element 122 is the same as the fifth embodiment in the mounting position and the like except that the first light wavelength conversion member 126 is not mounted. Further, the second semiconductor light emitting element 124 is the same as the fifth embodiment in the mounting position and the like except that the second light wavelength conversion member 128 is not mounted.

  The filter unit 142 includes an optical filter 54, a first light wavelength conversion member 144, and a second light wavelength conversion member 146. The material of the first light wavelength conversion member 144 is the same as that of the first light wavelength conversion member 126 described above. The material of the second light wavelength conversion member 146 is the same as that of the second light wavelength conversion member 128 described above. For this reason, the first light wavelength conversion member 144 is provided to convert the wavelength of the ultraviolet light Lu mainly emitted from the first semiconductor light emitting element 122 and emit the blue light Lb. The second light wavelength conversion member 146 is provided so as to convert the wavelength of the ultraviolet light Lu mainly emitted from the second semiconductor light emitting element 124 and emit the yellow light Ly. The first light wavelength conversion member 144 is formed in a plate shape and is attached to the incident surface 54 a of the optical filter 54. The second light wavelength conversion member 146 is formed in a plate shape and is attached to the emission surface 54 b of the optical filter 54.

  The filter unit 142 includes the first semiconductor light emitting element 48 such that the optical filter 54 forms an angle of 45 degrees with respect to each of the emission surface 126a of the first light wavelength conversion member 144 and the emission surface 128a of the second light wavelength conversion member 146. Is disposed above. At this time, the surface of the first light wavelength conversion member 144 illuminated by the light emitted from the first semiconductor light emitting element 48 becomes the incident surface 144a, and the second light wavelength conversion member illuminated by the light emitted from the light wavelength conversion member 52. The surface 146 becomes the exit surface 146a.

  Since the optical filter 54 is inclined at the above-described angle, the blue light Lb that has been wavelength-converted by the first light wavelength conversion member 144 and is emitted is transmitted toward the direction of emission from the emission surface 54b. The yellow light Ly emitted after being wavelength-converted by the second light wavelength conversion member 146 is reflected by the emission surface 54b. Therefore, the emission surface 146a of the second light wavelength conversion member 146 emits the combined white light Lw that is the combined light of both the blue light Lb and the yellow light Ly. Also in such an aspect, the synthetic white light Lw can be emitted using two semiconductor light emitting elements, and it becomes possible to emit white light with high luminous intensity.

  The present invention is not limited to the above-described embodiments, and an appropriate combination of the elements of each embodiment is also effective as an embodiment of the present invention. Various modifications such as design changes can be added to each embodiment based on the knowledge of those skilled in the art, and embodiments to which such modifications are added can also be included in the scope of the present invention. Such an example is given below.

  In a modification, in any of the above-described embodiments, the optical filter is provided to reflect the blue light Lb and transmit the yellow light Ly. This optical filter is disposed at an angle of 45 degrees with respect to each of the light emitting surface 48 a of the first semiconductor light emitting element 48 and the light emitting surface 52 a of the light wavelength conversion member 52. Thereby, the optical filter transmits the yellow light Ly emitted from the light wavelength conversion member 52 and emits the blue light Lb emitted from the first semiconductor light emitting element 48 toward the direction of emission from the emission surface. Reflect on. Also by this, the emission surface of the optical filter can emit the combined white light Lw that is the combined light of both the blue light Lb and the yellow light Ly.

It is sectional drawing which shows the structure of the vehicle headlamp which concerns on 1st Embodiment. It is a figure which shows the structure of the light emitting module board | substrate which concerns on 1st Embodiment. It is a figure which shows the structure of the light emitting module which concerns on 1st Embodiment. It is a figure which shows the structure of the light emitting module which concerns on 2nd Embodiment. It is a figure which shows the structure of the light emitting module which concerns on 3rd Embodiment. It is a figure which shows the structure of the light emitting module which concerns on 4th Embodiment. It is a figure which shows the structure of the light emitting module which concerns on 5th Embodiment. It is a figure which shows the structure of the light emitting module which concerns on 6th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Vehicle headlamp, 16 Lamp unit, 30 Projection lens, 34 Reflector, 40 Light emitting module, 44 Substrate, 48 1st semiconductor light emitting element, 48a Light emitting surface, 50 2nd semiconductor light emitting element, 50a Light emitting surface, 52 Light wavelength Conversion member, 52a exit surface, 54 optical filter, 54a entrance surface, 54b exit surface.

Claims (7)

A first light emitting element that mainly emits light in a range of wavelengths;
A second light emitting element that mainly emits light having a wavelength in substantially the same range as the first light emitting element;
A light wavelength conversion member that converts the wavelength of light emitted by the second light emitting element and emits the light;
By transmitting one of the main wavelength light emitted from the first light emitting element and the main wavelength light emitted from the light wavelength conversion member and reflecting the other, the combined light of both lights is emitted. An optical filter to
A light emitting module comprising: The first light emitting element is provided so as to mainly emit one of the first wavelength light and the second wavelength light in which both combined lights are white,
The light wavelength conversion member is provided so as to convert the wavelength of the light emitted from the second light emitting element so as to mainly emit the other of the first wavelength light and the second wavelength light. The light emitting module according to 1. A reflective surface;
The second light emitting element is disposed on the same plane as the first light emitting element,
The optical filter is disposed at a position where one of light emitted from the first light emitting element and light emitted from the light wavelength conversion member is incident,
The reflection surface is arranged to reflect the other of the light emitted from the first light emitting element and the light emitted from the light wavelength conversion member toward the emission surface of the optical filter. Item 3. The light emitting module according to Item 1 or 2. A first light emitting element that mainly emits light in a range of wavelengths;
A first light wavelength conversion member that converts the wavelength of light emitted by the first light emitting element and emits the light;
A second light emitting element that mainly emits light having a wavelength in substantially the same range as the first light emitting element;
A second light wavelength conversion member that mainly converts light having a wavelength different from a main wavelength of light emitted from the first light wavelength conversion member by converting the wavelength of light emitted by the second light emitting element;
By transmitting one of the light of the main wavelength emitted from the first light wavelength conversion member and the light of the main wavelength emitted from the second light wavelength conversion member and reflecting the other, An optical filter for emitting combined light; and
A light emitting module comprising:   The light emitting module according to claim 4, wherein the first light emitting element and the second light emitting element mainly emit ultraviolet light. A first light-emitting element that mainly emits light in a certain range of wavelengths, a second light-emitting element that mainly emits light in a wavelength that is substantially the same as the first light-emitting element, and wavelength-converting light emitted from the second light-emitting element By transmitting one of the light wavelength conversion member to be emitted, the light of the main wavelength emitted from the first light emitting element and the light of the main wavelength emitted from the light wavelength conversion member, and reflecting the other, An optical filter that emits combined light of both lights, and a light emitting module,
An optical member for collecting the light emitted from the light emitting module;
A lamp unit comprising: A first light-emitting element that mainly emits light in a certain range of wavelengths; a first light wavelength conversion member that converts the wavelength of light emitted from the first light-emitting element; and a light having a wavelength in substantially the same range as the first light-emitting element. A second light emitting element that mainly emits light, and a second light that mainly converts a wavelength different from the main wavelength of the light emitted from the first light wavelength conversion member by converting the wavelength of the light emitted by the second light emitting element. One of the light wavelength conversion member, the light having the main wavelength emitted from the first light wavelength conversion member, and the light having the main wavelength emitted from the second light wavelength conversion member is transmitted and the other is reflected. A light emitting module having an optical filter that emits combined light of both lights, and
An optical member for collecting the light emitted from the light emitting module;
A lamp unit comprising:

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