JP6621631B2 - Light source module - Google Patents

Description

  The present invention relates to a light source module.

  Conventionally, a light source module including a laser light source that emits laser light and a phosphor that emits light by receiving the laser light is known (see, for example, Patent Document 1).

JP 2011-129376 A

  The phosphor generates heat when it emits light upon receiving laser light. For this reason, it is necessary to radiate heat from the phosphor. The conventional light source module has room for improvement in terms of heat dissipation of the phosphor.

  This invention is made | formed in view of such a condition, The objective is to provide the technique which improves the heat dissipation of the fluorescent substance in a light source module.

  In order to solve the above problems, a light source module according to an aspect of the present invention includes a light source and a phosphor that is excited by light emitted from the light source and emits light having a wavelength different from that of the light source. A light wavelength conversion member having a surface, an inner surface reflection surface, and a light emission surface; and a heat dissipation member that supports the light wavelength conversion member and radiates heat. The light wavelength conversion member has a light guide path through which light from the light source incident from the light incident surface is reflected by the inner reflection surface and guided to the light exit surface. The phosphor is disposed on the light guide path and wavelength-converts at least part of the light from the light source to generate wavelength-converted light. The wavelength converted light is emitted from the light exit surface. According to this aspect, the heat dissipation of the phosphor in the light source module can be improved.

  In the above aspect, the inner reflection surface includes a first reflection surface and a second reflection surface, and the first reflection surface reflects the light of the light source incident from the light incident surface toward the second reflection surface, and the second reflection surface. The reflecting surface may reflect the light of the light source reflected by the first reflecting surface toward the light emitting surface. This aspect can also improve the heat dissipation of the phosphor in the light source module. In the above aspect, the second reflecting surface may have a larger surface roughness than the light incident surface. According to this aspect, it is possible to further diffuse the light toward the light emitting surface.

  In any one of the above aspects, the phosphor is layered and one main surface constitutes the second reflecting surface, and the heat dissipation member abuts on the other main surface of the phosphor and is reflected by the first reflecting surface. The light from the light source may be wavelength-converted on the second reflecting surface. According to this aspect, the heat dissipation of the phosphor can be further improved.

  In any of the above aspects, the light source includes a first light source and a second light source, the light incident surface includes a first light incident surface on which light emitted from the first light source is incident, and a first light incident A first light source incident from the first light incident surface and an incident from the second light incident surface, the second light incident surface being arranged non-parallel to the surface and receiving light emitted from the second light source The light from the second light source may be reflected by the first reflecting surface and condensed on the second reflecting surface. In any one of the above aspects, the light wavelength conversion member includes a plurality of the light sources, and the light wavelength conversion member has two main surfaces facing each other and a side surface connecting the two main surfaces, and the side surface is a first focal point. Including a curved surface portion based on a part of an ellipse having a second focal point and a flat surface portion passing through the first focal point, one of the two main surfaces constitutes the second reflecting surface, and the other emits light. The curved surface portion constitutes a first reflecting surface, the planar portion constitutes a light incident surface, and the second focal point overlaps with the second reflecting surface when viewed from the normal direction of the light emitting surface, The light source may emit light from the light source toward the first focal point when viewed from the normal direction of the light emitting surface. According to these aspects, the brightness of the light emitted from the light wavelength conversion member can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, the heat dissipation of the fluorescent substance in a light source module can be improved.

1 is a cross-sectional view showing a schematic structure of a vehicular lamp including a light source module according to Embodiment 1. FIG. FIG. 2A is a perspective view showing the light wavelength conversion member of the light source module and the vicinity thereof. FIG. 2B is a cross-sectional view taken along line AA in FIG. 5 is a perspective view showing a schematic structure of a light source module according to Embodiment 2. FIG. It is sectional drawing which shows schematic structure of the light wavelength conversion member with which the light source module which concerns on Embodiment 3 is equipped, and a thermal radiation member. FIG. 5A is a plan view showing a schematic structure of a light source and an optical wavelength conversion member provided in the light source module according to Embodiment 4. FIG. FIG. 5B is a perspective view showing a schematic structure of an optical wavelength conversion member provided in the light source module according to Embodiment 4. FIG. 5C is a plan view schematically showing the progress of light in the optical wavelength conversion member provided in the light source module according to Embodiment 4. FIG. 6A is a plan view showing a schematic structure of a light source and an optical wavelength conversion member provided in the light source module according to Embodiment 5. FIG. FIG. 6B is a perspective view showing a schematic structure of an optical wavelength conversion member provided in the light source module according to Embodiment 5. FIG. 6C is a plan view schematically showing the progress of light in the light wavelength conversion member provided in the light source module according to Embodiment 5.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. The embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention. The dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Further, in the drawings, some of the members that are not important for describing the embodiment are omitted.

(Embodiment 1)
1 is a cross-sectional view illustrating a schematic structure of a vehicular lamp including a light source module according to Embodiment 1. FIG. The vehicular lamp 1 is used as a vehicle headlamp, for example. The vehicular lamp 1 is disposed on each of the left and right sides of the front portion of the vehicle body. In the present embodiment, a vehicle lamp 1 positioned on one side as viewed from the front of the vehicle body will be described. The vehicular lamp 1 on the other side also basically has the same configuration.

  The vehicular lamp 1 includes a lamp body 12, a translucent cover 14, a lamp unit 16, and an extension reflector 18. The lamp body 12 is a box having an opening on the front side of the lamp. The translucent cover 14 is made of translucent resin or glass. The translucent cover 14 is attached to the lamp body 12 so as to cover the opening of the lamp body 12.

  The lamp unit 16 is disposed in a lamp chamber 20 formed by the lamp body 12 and the translucent cover 14. The lamp unit 16 is a so-called projector type optical unit. The lamp unit 16 is attached to a plate-shaped metal support member 22 arranged so that the main surface faces the lamp front-rear direction. The metal support member 22 is tiltably supported by the lamp body 12 by the aiming screw 24. When the aiming screw 24 rotates, the metal support member 22 tilts, and the lamp unit 16 tilts accordingly. Thereby, the optical axis O of the lamp unit 16 can be adjusted in the horizontal direction and the vertical direction.

  The extension reflector 18 is disposed in the lamp chamber 20 similarly to the lamp body 12. The extension reflector 18 is disposed so as to cover a region between the opening of the lamp body 12 and the outer periphery of the lamp unit 16. Thereby, the internal structure of the vehicle lamp 1 can be hidden.

  The lamp unit 16 includes a light source module 100, a reflector 26, a lens holder 28, and a projection lens 30.

  The light source module 100 includes a light source 102, a light wavelength conversion member 104, and a heat dissipation member 106. The light source module 100 according to the present embodiment has a configuration in which the light wavelength conversion member 104 is excited by light emitted from the light source 102 and irradiates non-coherent light generated thereby. For example, the light source 102 emits laser light L. The light wavelength conversion member 104 contains a phosphor that emits light when excited by the laser light L of the light source 102. White light W is emitted from the light wavelength conversion member 104. The white light W travels toward the reflector 26.

  The light source 102 and the light wavelength conversion member 104 are mounted on the heat dissipation member 106. The heat radiating member 106 is a substantially plate-like member made of a metal material such as aluminum. The heat radiation member 106 has an end portion on the rear side of the lamp connected to the main surface of the metal support member 22 and protrudes from the metal support member 22 to the front side of the lamp. In the present embodiment, the metal support member 22 and the heat dissipation member 106 are integrally formed. The light source 102 and the light wavelength conversion member 104 are mounted on the main surface of the heat radiating member 106 with the light source 102 disposed on the lamp rear side and the light wavelength conversion member 104 disposed on the lamp front side. Laser light L emitted from the light source 102 travels parallel to the main surface of the heat dissipation member 106 and is incident on the light wavelength conversion member 104. Heat generated by the light source 102 and the light wavelength conversion member 104 is radiated through the heat radiating member 106.

  The reflector 26 is a substantially dome-shaped member, and is disposed so as to face the light emission surface of the light wavelength conversion member 104. The reflector 26 has a reflection surface 26a on the inner side based on a spheroid. The reflective surface 26a has a first focal point and a second focal point located on the front side of the lamp relative to the first focal point. The reflector 26 has a positional relationship with the light wavelength conversion member 104 such that the first focal point of the reflection surface 26 a substantially coincides with the light emission surface of the light wavelength conversion member 104.

  The lens holder 28 is a member that is formed of a metal material such as aluminum and extends in the front-rear direction of the lamp. The lamp rear side of the lens holder 28 is fixed to the lamp front side of the heat dissipation member 106. The projection lens 30 is fixed to the end of the lens holder 28 on the front side of the lamp. The lens holder 28 has a flat surface portion 28 a that contacts the main surface of the heat radiating member 106 and a vertical surface portion 28 b that contacts the front end surface of the heat radiating member 106. A ridge line 28f formed by the flat surface portion 28a and the vertical surface portion 28b is located in the vicinity of the second focal point of the reflective surface 26a.

  The projection lens 30 is a plano-convex aspheric lens having a convex front surface and a flat rear surface. The projection lens 30 projects a light source image formed on the rear focal plane including the rear focus on the virtual vertical screen in front of the lamp as a reverse image. The projection lens 30 is disposed such that its rear focal point is located on the optical axis O of the lamp unit 16 and in the vicinity of the second focal point of the reflecting surface 26a.

  The white light W emitted from the light wavelength conversion member 104 is reflected by the reflecting surface 26a of the reflector 26 and enters the projection lens 30 through the second focal point of the reflecting surface 26a, that is, near the ridge line 28f. The light incident on the projection lens 30 is irradiated from the projection lens 30 to the front of the lamp as substantially parallel light. A part of the white light W reflected by the reflecting surface 26a is reflected by the flat portion 28a. That is, the white light W is selectively cut using the ridge line 28f as a boundary line. Thereby, the light distribution pattern which has the cut-off line corresponding to the shape of the ridgeline 28f is projected ahead of a vehicle. That is, the flat surface portion 28a, the vertical surface portion 28b, and the ridge line 28f function as a shade.

  Next, the structure of the light source module 100 will be described in detail. FIG. 2A is a perspective view showing the light wavelength conversion member 104 of the light source module 100 and the vicinity thereof. FIG. 2B is a cross-sectional view taken along line AA in FIG.

  The light source module 100 includes a light source 102, a light wavelength conversion member 104, and a heat dissipation member 106. The light source 102 is composed of, for example, a laser diode (semiconductor laser) that emits laser light L. Since the structure of the laser diode constituting the light source 102 is conventionally known, detailed description thereof is omitted. The light source 102 may be configured by a laser device such as a solid laser or a gas laser. The light source 102 emits laser light L toward the light wavelength conversion member 104. A condensing lens (not shown) may be provided between the light source 102 and the light wavelength conversion member 104.

  The light wavelength conversion member 104 includes a phosphor 108, a light guide 110, a reflective film 112, a substrate 114, and a band pass filter 116.

  The phosphor 108 is excited by the laser light L emitted from the light source 102 and emits light having a wavelength different from that of the laser light L. In the present embodiment, the light source 102 emits blue laser light L toward the light wavelength conversion member 104. When the laser light L is incident on the light wavelength conversion member 104, the phosphor 108 absorbs a part of the laser light L, converts the wavelength, and generates yellow light as the wavelength conversion light. The yellow light emitted from the phosphor and the blue laser light L that has not been absorbed by the phosphor are mixed to become white light W. For this reason, white light W is emitted from the light wavelength conversion member 104.

  The phosphor 108 is supported by the light guide 110. The light guide 110 is made of a light-transmitting material such as glass or alumina. In the present embodiment, the powdery phosphors 108 are uniformly dispersed in the light guide 110. The phosphor 108 may be a so-called luminescent ceramic or fluorescent ceramic obtained by sintering a ceramic base made using YAG (Yttrium Aluminum Garnet) powder or the like. In this case, the light guide 110 is omitted.

  The light guide 110 has a light incident surface 110a, an inner surface reflecting surface 110b, and a light emitting surface 110c. Laser light L emitted from the light source 102 enters the light guide 110 from the light incident surface 110a. A band pass filter 116 is fixed to the light incident surface 110a. The band pass filter 116 transmits the laser light L from the light source 102. The band pass filter 116 reflects yellow light emitted from the phosphor 108. Thereby, the utilization efficiency of the light which the fluorescent substance 108 emits can be improved. The band pass filter 116 is in contact with the light incident surface 110a in the present embodiment, but may be in non-contact with the light incident surface 110a. When the band-pass filter 116 and the light incident surface 110a are not in contact with each other, it is preferable to reduce the distance between the two in order to suppress light leakage from the light incident surface 110a. The substrate 114 functions as a support substrate in the process of forming the band pass filter 116. The bandpass filter 116 is laminated on the substrate 114, and is fixed to the light incident surface 110a while being laminated on the substrate 114. The substrate 114 is made of a material that transmits the laser light L, such as glass. The band pass filter 116 may be provided on the light incident surface 110a by a method such as vapor deposition directly on the light incident surface 110a. In this case, the substrate 114 is omitted.

  The inner reflective surface 110b is a reflective surface for guiding the laser light L incident from the light incident surface 110a to the light emitting surface 110c. In the present embodiment, the inner reflective surface 110b includes a first reflective surface 110b1 and a second reflective surface 110b2. The first reflecting surface 110b1 reflects the laser light L incident from the light incident surface 110a toward the second reflecting surface 110b2. The second reflecting surface 110b2 reflects the laser light L reflected by the first reflecting surface 110b1 toward the light emitting surface 110c.

  The second reflecting surface 110b2 has a larger surface roughness than the light incident surface 110a. Thereby, the laser beam L can be reflected toward the light emitting surface 110c while being further diffused. As a result, the blue laser light L and the yellow wavelength-converted light generated by the phosphor 108 are more likely to be mixed, and more uniform white light W can be formed. In addition, the light guide 110 may be mixed with a filler for diffusing light.

  Specifically, the light guide 110 has a quadrangular frustum shape, and has an upper bottom surface and a lower bottom surface that are parallel to each other, and four side surfaces. The three side surfaces are perpendicular to the upper bottom surface and the lower bottom surface. The remaining one side surface is inclined obliquely so as to approach the center of the light guide 110 as it approaches the bottom surface from the bottom surface. That is, this side surface is inclined so as to cover the lower bottom surface.

  A side surface facing away from the inclined side surface constitutes a light incident surface 110 a, and the side surface is covered with a band-pass filter 116. Further, the inclined side surface is covered with the reflective film 112. The reflective film 112 is a film that reflects the laser light L and the wavelength-converted light. Thereby, the inclined side surface constitutes the first reflecting surface 110b1. In addition to the inclined side surface, the reflective film 112 covers the remaining two side surfaces connected to the inclined side surface. Thereby, the utilization efficiency of laser beam L and wavelength conversion light can be raised. The reflective film 112 can be formed by applying, plating, vapor-depositing, etc., a conventionally known reflective material on the surface of the light guide 110.

  Further, the lower bottom surface of the light guide 110 is in contact with the heat dissipation member 106 in a state where the light wavelength conversion member 104 is mounted on the heat dissipation member 106. Therefore, the lower bottom surface is covered with the heat radiating member 106. Thus, the lower bottom surface constitutes the second reflecting surface 110b2. The upper bottom surface facing away from the lower bottom surface constitutes the light emitting surface 110c. Therefore, the light incident surface 110a and the light emitting surface 110c are arranged so as to cross each other.

  Inside the light wavelength conversion member 104, the laser light L incident from the light incident surface 110a is reflected by the inner reflection surface 110b (more specifically, the first reflection surface 110b1 and the second reflection surface 110b2) and is reflected on the light emission surface 110c. A guided light guide path is included. The phosphor 108 is disposed on the light guide path, and wavelength-converts a part of the laser light L passing through the light guide path. The wavelength-converted light generated by the phosphor 108 is emitted from the light exit surface 110c through the light guide path together with the laser light L. In addition, when the fluorescent substance 108 is comprised with the fluorescent ceramic mentioned above, the fluorescent substance 108 has a light-incidence surface, an inner surface reflective surface, and a light-projection surface.

  The heat radiating member 106 supports the light wavelength conversion member 104 and radiates heat generated when the phosphor 108 converts the wavelength of the laser light L. The heat radiating member 106 also supports the light source 102 and radiates heat generated by the light source 102. Thereby, the temperature rise of the light wavelength conversion member 104 and the light source 102 can be suppressed.

  As described above, the light source module 100 according to the present embodiment includes the light source 102, the light wavelength conversion member 104 containing the phosphor 108, and the heat dissipation member 106. The light wavelength conversion member 104 has a light guide path through which the laser light L of the light source 102 enters from the light incident surface 110a, and the laser light L is reflected by the inner reflection surface 110b and guided to the light emission surface 110c. The phosphor 108 is disposed on the light guide path, and a part of the laser light L is wavelength-converted to generate wavelength-converted light. From the light emitting surface 110c, white light W obtained by mixing the laser light L and the wavelength-converted light is emitted.

  In a conventional light source module having a light wavelength conversion member with the light incident surface and the light output surface facing away from each other, it is necessary to bring a heat dissipation member into contact with the side surface of the light wavelength conversion member orthogonal to the light incident surface and the light output surface. was there. In this case, in order to increase the contact area between the light wavelength conversion member and the heat dissipation member, it is necessary to enlarge the side surface of the light wavelength conversion member. However, when the side surface of the light wavelength conversion member is enlarged, the dimension of the light wavelength conversion member increases in the direction intersecting with the light incident surface and the light output surface (for example, the normal direction of the light output surface). Due to the increase in size, the distance from each phosphor in the light wavelength conversion member to the light exit surface is increased. In other words, the amount of phosphor at a position far from the light exit surface increases. As a result, the light emission efficiency of the light wavelength conversion member is lowered, and as a result, the light utilization rate of the light source module is lowered.

  On the other hand, in the light source module 100 of the present embodiment, the light wavelength conversion member 104 has an inner surface reflection surface 110b. For this reason, it can arrange | position so that the light-incidence surface 110a and the light-projection surface 110c may cross. Therefore, the heat radiating member 106 can be brought into contact with the surface facing the light emitting surface 110c (that is, the second reflecting surface 110b2). In this case, even if the area of the second reflection surface 110b2 is increased in order to increase the contact area between the light wavelength conversion member 104 and the heat dissipation member 106, the dimension of the light wavelength conversion member 104 in the normal direction of the light emission surface 110c is not increased. An increase in size can be avoided. Therefore, the contact area between the light wavelength conversion member 104 and the heat dissipation member 106 can be increased without increasing the number of phosphors located far from the light exit surface. Therefore, the heat dissipation of the phosphor 108 in the light source module 100 can be improved. In addition, it is possible to achieve both the heat dissipation improvement of the phosphor 108 and the light utilization efficiency of the light source module 100.

  In the present embodiment, the light incident surface 110a and the light emitting surface 110c are perpendicular to each other. That is, the incident angle of the laser light L to the light wavelength conversion member 104 and the emission angle of the white light W from the light wavelength conversion member 104 are shifted by 90 °. For this reason, the light source module 100 can be made thinner than the conventional light source module in which the incident angle and the outgoing angle are parallel. Therefore, it is possible to contribute to reducing the thickness of the vehicular lamp 1 on which the light source module 100 is mounted.

  The first reflecting surface 110b1 is inclined so as to cover the second reflecting surface 110b2. Therefore, the area of the light emitting surface 110c can be made smaller than that of the second reflecting surface 110b2. Thereby, the luminance area of the white light W emitted from the light wavelength conversion member 104 can be increased by reducing the light emitting area.

(Embodiment 2)
The light source module according to the second embodiment is common to the configuration of the light source module 100 according to the first embodiment, except that a plurality of light sources are provided. Hereinafter, the light source module according to the second embodiment will be described with a focus on the configuration different from that of the first embodiment, and the common configuration will be described briefly or the description will be omitted.

  FIG. 3 is a perspective view showing a schematic structure of the light source module according to Embodiment 2. FIG. The light source module 200 according to the present embodiment includes a plurality of light sources 102, a light wavelength conversion member 104, a heat radiating member 106, and a condenser lens 218. The plurality of light sources 102 are placed on the main surface of the heat dissipation member 106. In the present embodiment, the posture of each light source 102 is determined so that the emission directions of the laser light L from each light source 102 are parallel.

  The condenser lens 218 is disposed on the path of the laser light L of each light source 102. The condenser lens 218 is fixed to the heat dissipation member 106. The laser light L emitted from each light source 102 is converted into parallel light by the common condensing lens 218 and condensed, and enters the light wavelength conversion member 104. A part of the laser light L incident on the light wavelength conversion member 104 is wavelength-converted by the phosphor 108 (see FIG. 2B) in the process of traveling along the light guide path in the light wavelength conversion member 104. Then, the laser light L and the wavelength converted light are mixed, and the white light W is emitted from the light wavelength conversion member 104.

  The plurality of light sources 102 may be arranged so as to spread radially around the light wavelength conversion member 104. In this case, the posture of each light source 102 is determined so that the emission direction of the laser light L faces the light wavelength conversion member 104. The light source module 200 includes a plurality of condensing lenses 218, and each condensing lens 218 is disposed between each light source 102 and the light wavelength conversion member 104. Each condensing lens 218 converts the laser light L toward the light wavelength conversion member 104 into parallel light. By arranging the plurality of light sources 102 radially, the distance between the adjacent light sources 102 can be increased, and the heat dissipation of the light sources 102 can be improved.

  The light source module 200 according to the present embodiment includes a plurality of light sources 102. For this reason, the brightness of the white light W emitted from the light wavelength conversion member 104 can be increased. The plurality of light sources 102 are mounted on the main surface of the heat dissipation member 106. For this reason, the heat dissipation of each light source 102 is securable. Moreover, it can suppress that the thickness of the light source module 200 becomes large by the increase in the number of light sources.

(Embodiment 3)
The light source module according to Embodiment 3 has the same configuration as that of the light source module 100 according to Embodiment 1 except that the structure of the light wavelength conversion member 104 is different. Hereinafter, the light source module according to the third embodiment will be described with a focus on the configuration different from the first embodiment, and the common configuration will be described briefly or the description will be omitted.

  FIG. 4 is a cross-sectional view illustrating a schematic structure of a light wavelength conversion member and a heat dissipation member included in the light source module according to Embodiment 3. The light source module 300 according to this embodiment includes a light source 102 (see FIG. 2A), a light wavelength conversion member 304, and a heat dissipation member 106.

  The light wavelength conversion member 304 includes a phosphor 308, a light guide 310, a reflective film 112, a substrate 114, and a band pass filter 116. The light guide 310 has a substantially quadrangular pyramid shape, and a reflective film 112 is provided on a side surface inclined obliquely, and this side surface constitutes the first reflective surface 310b1. Further, the side surface facing away from the inclined side surface constitutes the light incident surface 310a. A band pass filter 116 and a substrate 114 are provided on this side surface.

  Further, the phosphor 308 is layered and is disposed so that one main surface is in contact with the lower bottom surface of the light guide 310. Thereby, the lower bottom surface of the light guide 310, in other words, one main surface of the phosphor 308 constitutes the second reflecting surface 310b2. Therefore, the fluorescent substance 308 is arrange | positioned in the position of the 2nd reflective surface 310b2 in the light guide path which the light wavelength conversion member 304 has. The heat radiating member 106 is in contact with the other main surface of the phosphor 308 (that is, the main surface facing away from the main surface in contact with the light guide 310). The upper bottom surface of the light guide 310 constitutes a light emitting surface 310c.

  The laser light L emitted from the light source 102 enters the light guide 310 from the light incident surface 310a through the substrate 114 and the band pass filter 116. The laser light L incident on the light guide 310 travels to the first reflecting surface 310b1 without substantially diffusing, and is reflected toward the second reflecting surface 310b2 by the first reflecting surface 310b1. A part of the laser light L reflected by the first reflecting surface 310b1 is wavelength-converted by the phosphor 308 on the second reflecting surface 310b2. Further, the laser beam L is diffusely reflected on the second reflecting surface 310b2. The wavelength-converted light generated by the phosphor 308 and the laser light L are mixed to form white light W, which is emitted from the light exit surface 310c.

  Examples of the method for forming the layered phosphor 308 include the following methods. That is, when the light guide 310 is formed, the layered phosphor 308 can be formed by allowing the phosphor powder to settle in the light guide 310. Alternatively, the layered phosphor 308 can be formed by sintering the phosphor powder on the bottom surface of the light guide 310.

  In the present embodiment, the phosphor 308 is localized in the light wavelength conversion member 304. The heat radiating member 106 is in contact with the localized phosphor 308. For this reason, the heat dissipation of the fluorescent substance 308 can be improved more.

(Embodiment 4)
The light source module according to Embodiment 4 has the same configuration as that of the light source module 100 according to Embodiment 1, except that the structure of the light wavelength conversion member is different and a plurality of light sources are provided. Hereinafter, the light source module according to the fourth embodiment will be described focusing on the configuration different from that of the first embodiment, and the common configuration will be briefly described or the description thereof will be omitted.

  FIG. 5A is a plan view showing a schematic structure of a light source and an optical wavelength conversion member provided in the light source module according to Embodiment 4. FIG. FIG. 5B is a perspective view showing a schematic structure of an optical wavelength conversion member provided in the light source module according to Embodiment 4. FIG. 5C is a plan view schematically showing the progress of light in the optical wavelength conversion member provided in the light source module according to Embodiment 4. 5A to 5C, the reflective film 112, the substrate 114, and the band pass filter 116 are not shown.

  A light source module 400 according to this embodiment includes a first light source 102a and a second light source 102b, a light wavelength conversion member 404, a heat dissipation member 106 (see FIG. 2A), and a condenser lens 418. The first light source 102a and the second light source 102b are the same as the light source 102 of the first embodiment. The condenser lens 418 is a lens that converts the laser light L into parallel light.

  The light wavelength conversion member 404 includes a phosphor 408, a light guide 410, a reflective film 112 (see FIG. 2B), a substrate 114 (see FIG. 2B), and a bandpass filter 116 (FIG. 2). (See (B)).

  The light guide 410 has a substantially frustum shape, and has two main surfaces (a lower bottom surface and an upper bottom surface) facing each other and a side surface connecting the two main surfaces. The light guide 410 includes a first light incident surface 410a1, a second light incident surface 410a2, a first reflecting surface 410b1, a second reflecting surface 410b2, and a light emitting surface 410c. As in the third embodiment, the phosphor 408 is layered, and is arranged so that one main surface is in contact with the lower bottom surface of the light guide 410. Thereby, the lower bottom surface of the light guide 410, in other words, one main surface of the phosphor 408 constitutes the second reflecting surface 410b2. The upper bottom surface of the light guide body 410 constitutes a light emitting surface 410c.

  The side surface of the light guide body 410 includes a substantially U-shaped curved surface portion, a first flat surface portion extending from one end of the curved surface portion, and a second flat surface portion extending from the other end of the curved surface portion. One end of each of the first plane part and the second plane part is connected to the end part of the curved surface part, and each other end is connected to each other. The curved surface portion is inclined in a direction covering the lower bottom surface and constitutes the first reflecting surface 410b1. The curved surface portion has a shape based on a part of an ellipse. For example, the first reflecting surface 410b1 is a curved line having the same shape as a part of an ellipse having a first focal point F1 and a second focal point F2 on the side in contact with the light emitting surface 410c. It has a shape that expands while maintaining a similar relationship with the curve.

  The first plane portion is perpendicular to the lower bottom surface and the upper bottom surface and constitutes the first light incident surface 410a1. The second plane portion is perpendicular to the lower bottom surface and the upper bottom surface and constitutes the second light incident surface 410a2. The first light incident surface 410a1 and the second light incident surface 410a2 are arranged non-parallel.

  In addition, the light guide 410 has a line-symmetric shape with a straight line P passing through the first focus F1 and the second focus F2 as an axis of symmetry in plan view. The first light incident surface 410a1 and the second light incident surface 410a2 are connected to each other on a straight line P.

  The first light source 102a is disposed at a position facing the first light incident surface 410a1. The second light source 102b is disposed at a position facing the second light incident surface 410a2. A condensing lens 418 is disposed between the first light source 102a and the first light incident surface 410a1, and between the second light source 102b and the second light incident surface 410a2. The laser light L1 emitted from the first light source 102a passes through the condenser lens 418 and enters the first light incident surface 410a1. The laser light L2 emitted from the second light source 102b passes through the condenser lens 418 and enters the second light incident surface 410a2. The laser light L1 and the laser light L2 are incident on each light incident surface substantially perpendicularly (with an incident angle of 0 °).

  The laser light L1 of the first light source 102a incident from the first light incident surface 410a1 and the laser light L2 of the second light source 102b incident from the second light incident surface 410a2 are respectively reflected by the first reflective surface 410b1. Reflected toward 410b2. Since the first reflective surface 410b1 has the curved surface shape described above, the two laser beams L1 and L2 reflected by the first reflective surface 410b1 travel toward the predetermined region R on the second reflective surface 410b2. Therefore, the laser beam L1 and the laser beam L2 are condensed on the second reflecting surface 410b2.

  Part of the condensed laser beams L1 and L2 is wavelength-converted by the phosphor 408 in the predetermined region R of the second reflecting surface 410b2. Further, the laser beams L1 and L2 are diffusely reflected on the second reflecting surface 410b2. The wavelength-converted light generated by the phosphor 408 and the laser beams L1 and L2 are mixed to form white light W, which is emitted from the light exit surface 410c.

  In the present embodiment, the laser light L1 of the first light source 102a enters the light guide 410 from the first light incident surface 410a1, and the laser light L2 of the second light source 102b enters the light guide 410 from the second light incident surface 410a2. Is incident on. The laser beams L1 and L2 are reflected by the first reflecting surface 410b1 and collected on the second reflecting surface 410b2. By taking such a structure, the luminance of the white light W emitted from the light wavelength conversion member 404 can be increased. In the light source module 400 according to the present embodiment, the number of combinations of the light source and the light incident surface is two, but is not particularly limited to this configuration. The number of the combinations may be three or more, and even in this case, the combination includes at least two combinations, and thus is included in the scope of the present invention.

(Embodiment 5)
The light source module according to Embodiment 5 has the same configuration as that of the light source module 100 according to Embodiment 1, except that the structure of the light wavelength conversion member is different and a plurality of light sources are provided. Hereinafter, the light source module according to the fifth embodiment will be described focusing on the configuration different from the first embodiment, and the common configuration will be briefly described or the description thereof will be omitted.

  FIG. 6A is a plan view showing a schematic structure of a light source and an optical wavelength conversion member provided in the light source module according to Embodiment 5. FIG. FIG. 6B is a perspective view showing a schematic structure of an optical wavelength conversion member provided in the light source module according to Embodiment 5. FIG. 6C is a plan view schematically showing the progress of light in the light wavelength conversion member provided in the light source module according to Embodiment 5. In FIGS. 6A to 6C, the reflective film 112, the substrate 114, and the band-pass filter 116 are not shown.

  A light source module 500 according to this embodiment includes a plurality of light sources 102, a light wavelength conversion member 504, a heat dissipation member 106 (see FIG. 2A), and a condenser lens 518. The condenser lens 518 is a lens that converts the laser light L into parallel light.

  The light wavelength conversion member 504 includes a phosphor 508, a light guide 510, a reflective film 112 (see FIG. 2B), a substrate 114 (see FIG. 2B), and a bandpass filter 116 (FIG. 2). (See (B)).

  The light guide 510 has a substantially frustum shape, and has two main surfaces (a lower bottom surface and an upper bottom surface) that face each other and a side surface that connects the two main surfaces. The light guide 510 includes a light incident surface 510a, a first reflecting surface 510b1, a second reflecting surface 510b2, and a light emitting surface 510c. Similar to Embodiment 3, phosphor 508 is layered, and is disposed such that one main surface is in contact with the bottom surface of light guide 510. Thereby, the lower bottom surface of the light guide 510, in other words, one main surface of the phosphor 508 constitutes the second reflecting surface 510b2. The upper bottom surface of the light guide 510 constitutes a light exit surface 510c. That is, one of the two main surfaces of the light guide 510 constitutes the second reflecting surface 510b2, and the other constitutes the light emitting surface 510c.

  The side surface of the light guide 510 includes a substantially U-shaped curved surface portion and a flat surface portion extending from one end of the curved surface portion to the other end. The curved surface portion is inclined in a direction covering the lower bottom surface, and constitutes the first reflecting surface 510b1. The curved surface portion has a shape based on a part of an ellipse having the first focus F1 and the second focus F2. For example, the first reflective surface 510b1 is a curve having the same shape as a part of an ellipse having a first focal point F1 and a second focal point F2 on the side in contact with the light emitting surface 510c, and as the second reflective surface 510b2 approaches It has a shape that expands while maintaining a similar relationship with the curve.

  The plane portion is perpendicular to the lower bottom surface and the upper bottom surface and constitutes the light incident surface 510a. Further, the plane portion passes through the first focal point F1. That is, the first focal point F1 overlaps with the light incident surface 510a. On the other hand, the second focal point F2 overlaps with the second reflecting surface 510b2 when viewed from the normal direction of the light emitting surface 510c. The light guide 510 has a line-symmetric shape with a straight line P passing through the first focal point F1 and the second focal point F2 as an axis of symmetry in plan view.

  The plurality of light sources 102 are arranged so as to spread radially around the first focal point F1 on the light incident surface 510a. A condensing lens 518 is disposed between each light source 102 and the light incident surface 510a. The plurality of light sources 102 emit laser light L toward the first focal point F1 when viewed from the normal direction of the light emitting surface 510c. That is, the plurality of light sources 102 emit the laser light L on a straight line that passes through the first focal point F1 and is parallel to the normal line of the light emitting surface 510c on the light incident surface 510a. The laser light L emitted from each light source 102 passes through the condenser lens 518 and enters the light incident surface 510a.

  The laser light L of each light source 102 incident from the light incident surface 510a is reflected by the first reflecting surface 510b1 toward the second reflecting surface 510b2. Since the first reflecting surface 510b1 has the curved surface shape described above, the plurality of laser beams L reflected by the first reflecting surface 510b1 travel toward the predetermined region R1 on the second reflecting surface 510b2. The predetermined region R1 is a region including the second focal point F2 when viewed from the normal direction of the light emitting surface 510c. The plurality of laser beams L are condensed on a predetermined region R1 on the second reflecting surface 510b2.

  A part of the collected laser light L is wavelength-converted by the phosphor 508 on the second reflecting surface 510b2. The laser light L is diffusely reflected by the second reflecting surface 510b2. The wavelength-converted light generated by the phosphor 508 and the laser light L are mixed to form white light W, which is emitted from the light exit surface 510c.

  According to the present embodiment, the laser light L can be incident on the optical wavelength conversion member 504 at various incident angles. Therefore, the freedom degree of arrangement | positioning of the light source 102 can be raised. Further, since the laser light L emitted from the plurality of light sources 102 can be condensed, the luminance of the white light W emitted from the light wavelength conversion member 504 can be increased. Note that the number of light sources 102 may be three or more.

  The present invention is not limited to the above-described embodiments, and the embodiments can be combined, or various modifications such as design changes can be added based on the knowledge of those skilled in the art. New embodiments obtained by various combinations or modifications are also included in the scope of the present invention. Such a new embodiment has the effects of the combined embodiments and modifications.

  In each of the above-described embodiments, the case where the lamp unit is a so-called projector-type optical unit has been described. However, the present invention is not limited to this. For example, the lamp unit may be a so-called parabolic optical unit.

  In each of the above-described embodiments, white light is generated by mixing the blue laser light emitted from the light source and the yellow light generated by the phosphor. However, the light source and the phosphor are not limited to this combination, and for example, the following may be used. That is, the light source is a light source that emits ultraviolet laser light. The phosphor includes a blue light-emitting phosphor that converts the wavelength of ultraviolet laser light into blue light, and a yellow light-emitting phosphor that converts the wavelength of ultraviolet laser light into yellow light. In this combination, the ultraviolet laser light emitted from the light source is incident on the light wavelength conversion member, and is converted into blue light and yellow light by the phosphor. Blue light and yellow light emitted from the light exit surface of the light wavelength conversion member are mixed to become white light.

  100, 200, 300, 400, 500 light source module, 102 light source, 102a first light source, 102b second light source, 104, 304, 404, 504 light wavelength conversion member, 106 heat radiation member, 108, 308, 408, 508 phosphor 110a, 310a, 510a Light incident surface, 110b Internal reflecting surface, 110b1, 310b1, 410b1, 510b1 First reflecting surface, 110b2, 310b2, 410b2, 510b2 Second reflecting surface, 110c, 310c, 410c, 510c Light emitting surface, 410a1 first light incident surface, 410a2 second light incident surface, F1 first focus, F2 second focus.

Claims (6)

A light source;
A light wavelength conversion member including a phosphor that is excited by light emitted from the light source and emits light having a wavelength different from that of the light of the light source;
A heat dissipating member that supports the light wavelength conversion member and dissipates heat, and
The light wavelength conversion member has a light guide path through which light of the light source incident from the light incident surface is reflected by the inner reflection surface and guided to the light emission surface;
The phosphor is disposed on the light guide path and wavelength-converts at least part of the light of the light source to generate wavelength-converted light,
The wavelength-converted light is emitted from the light exit surface ,
The inner reflection surface includes a first reflection surface and a second reflection surface,
The first reflecting surface reflects the light of the light source incident from the light incident surface toward the second reflecting surface,
The second reflecting surface reflects the light of the light source reflected by the first reflecting surface toward the light emitting surface,
The second reflecting surface has a larger surface roughness than the light incident surface,
The phosphor is layered, and one main surface constitutes the second reflecting surface,
The light source module reflected by the first reflecting surface is irradiated to the second reflecting surface and wavelength-converted by the phosphor . Before SL radiating member, the light source module of claim 1 in contact with the other main surface of the phosphor. The light source includes a first light source and a second light source,
The light incident surface is disposed non-parallel to the first light incident surface on which the light emitted from the first light source is incident, and the light emitted from the second light source is incident on the light incident surface. A second light incident surface,
The light of the first light source incident from the first light incident surface and the light of the second light source incident from the second light incident surface are reflected by the first reflecting surface, respectively, and the second reflecting surface. The light source module according to claim 1 , wherein the light source module is focused on. Comprising a plurality of the light sources,
The light wavelength conversion member has two main surfaces facing each other, and a side surface connecting the two main surfaces,
The side surface includes a curved surface portion based on a part of an ellipse having a first focus and a second focus, and a plane portion passing through the first focus,
One of the two main surfaces constitutes the second reflecting surface, the other constitutes the light emitting surface, the curved surface portion constitutes the first reflecting surface, and the flat surface portion constitutes the light incident surface. Configure
The second focal point overlaps the second reflecting surface when viewed from the normal direction of the light emitting surface;
A plurality of the light source, the light source module according to claim 1 or 2 for emitting light of the light source toward the first focal point when viewed from the normal direction of the light exit surface.   5. The light source module according to claim 1, further comprising a band-pass filter that is fixed with respect to the light incident surface, transmits light from the light source, and reflects the wavelength-converted light.   The light source module according to claim 1, wherein the light incident surface and the light emitting surface are perpendicular to each other.

Images