JP2018101534A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture capable of achieving both fail-safe and effective utilization of a luminous flux.SOLUTION: A vehicular lighting fixture 10 includes: a laser light source 22 which includes a semiconductor laser element 36 for emitting excitation light, an emission port and a first wavelength conversion member 20 fixed to the emission port so as to block the emission port and for emitting at least light of a first wavelength different from the excitation light when receiving the excitation light, and which emits white light from the emission port; a second wavelength conversion member 30 arranged outside the laser light source 22, and for emitting at least light of the first wavelength when receiving the excitation light; a first reflection surface 40 arranged being deviated from a straight advance optical path 43 advancing straight to the outside of the laser light source 22 from the semiconductor laser element 36 via the emission port; and a second reflection surface 42 disposed so as to reflect the light advancing along the straight advance optical path 43 and direct it to the second wavelength conversion member 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicular lamp.

  A vehicular lamp using a semiconductor laser light source is generally designed to convert excitation light emitted from the light source into white light and emit it. A high-power laser light source is used to brightly illuminate far away. It is not desired that high-power excitation light be emitted outside the vehicular lamp, not only when the vehicular lamp is operating normally, but even if a malfunction or failure occurs in the lamp.

  In Patent Document 1, it is proposed to provide a hole for transmitting excitation light in a reflector that receives white light.

JP 2012-119170 A

  As a result of intensive studies on a vehicular lamp using a laser light source, the present inventors have come to recognize the following problems. If the excitation light is emitted from the laser light source as it is, the optical path is assumed to be included in the optical path taken by white light. This is because white light and excitation light originate from the same light source, and excitation light should have higher directivity than white light. Therefore, when the excitation light transmission hole is provided in the reflector for white light, the white light is transmitted through the transmission hole. The transmitted light is thrown behind the reflector and is not used as illumination light and is wasted. Therefore, the vehicular lamp using the laser light source has room for improvement from the viewpoint of effective use of the luminous flux while considering fail-safe.

  This invention is made | formed in view of such a condition, The objective is to provide the vehicle lamp which enables coexistence of fail safe and effective utilization of a light beam.

  In order to solve the above-described problems, a vehicular lamp according to an aspect of the present invention includes a semiconductor laser element that emits excitation light, an exit port, and an exit port that is fixed to the exit port so as to fill the exit port. A first wavelength conversion member that emits light having a first wavelength different from the light, and a laser light source that emits white light from the exit, and a laser light source that is disposed outside the laser light source and receives at least the first wavelength when receiving excitation light A second wavelength converting member that emits light, a first reflecting surface that is disposed off the straight light path that goes straight from the semiconductor laser element to the outside of the laser light source through the emission port, and reflects white light forward of the lamp; and a straight light path A second reflecting surface arranged to reflect the light traveling along the second wavelength conversion member.

  According to this aspect, part of the white light emitted from the laser light source is reflected by the first reflecting surface, and the other part of the white light is reflected by the second reflecting surface. The white light reflected by the first reflecting surface is emitted forward of the lamp and used as illumination light. White light reflected by the second reflecting surface can also be used for illumination. Therefore, the white light that is wasted is reduced, and the luminous flux utilization factor is improved.

  On the other hand, it is considered that the excitation light leaking from the laser light source as the first wavelength conversion member is broken or dropped typically takes a straight light path that goes straight from the semiconductor laser element to the outside of the laser light source through the emission port. This leakage excitation light is reflected by the second reflecting surface and directed to the second wavelength conversion member. The second wavelength conversion member can perform the same or similar wavelength conversion action on the excitation light as the first wavelength conversion member, and can convert the excitation light into safer light such as white light or visible light similar thereto. In this way, the emission of excitation light out of the lamp, for example irradiation in front of the lamp, is mitigated, minimized or preferably completely prevented. The excitation light converted by the second wavelength conversion member can be reused for illumination. Therefore, a vehicular lamp is provided that enables both fail-safe and effective use of luminous flux.

  The second reflecting surface may be formed so as to reflect the light traveling along the straight light path and collect the light on the second wavelength conversion member.

  The vehicular lamp may further include an optical member that directs the light emitted from the second wavelength conversion member toward the front of the lamp so as to at least partially overlap the white light reflected by the first reflecting surface.

  The second wavelength conversion member may be disposed outside the optical path of white light reflected by the first reflecting surface.

  The second reflective surface may include a transflective region. The vehicular lamp may further include a sensor that is disposed behind the second reflecting surface and detects excitation light that has passed through the transflective region.

  The vehicular lamp may further include a polarizing member that is disposed in the optical path of white light and can block the excitation light.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle lamp which makes compatible both a fail safe and the effective utilization of a light beam can be provided.

1 is a vertical sectional view schematically showing a schematic structure of a vehicular lamp according to a first embodiment. It is a figure which shows schematically the internal structure of the laser light source which concerns on embodiment. It is a figure which shows schematically the internal structure of the laser light source which concerns on embodiment. It is the schematic for demonstrating the optical path in the inside of the vehicle lamp which concerns on 1st Embodiment. It is the schematic for demonstrating the optical path in the inside of the vehicle lamp which concerns on 1st Embodiment. The light distribution pattern formed with the vehicle lamp which concerns on 1st Embodiment is illustrated. It is a vertical sectional view which shows typically the schematic structure of the vehicular lamp concerning a 2nd embodiment. It is a vertical sectional view which shows typically the schematic structure of the vehicular lamp concerning a 2nd embodiment. It is a vertical sectional view which shows typically the schematic structure of the vehicular lamp concerning a 3rd embodiment.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The embodiments do not limit the invention but are exemplifications, and all features and combinations described in the embodiments are not necessarily essential to the invention. 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. In addition, the scale and shape of each part shown in each drawing are set for convenience in order to facilitate the explanation, and are not limitedly interpreted unless otherwise specified.

(First embodiment)
FIG. 1 is a vertical sectional view schematically showing a schematic structure of a vehicular lamp 10 according to the first embodiment. A vehicular lamp 10 described in the present embodiment is a vehicular headlamp apparatus having a pair of headlamp units arranged on the left and right sides in front of the vehicle. Since the pair of headlamp units have substantially the same configuration, FIG. 1 shows the structure of the headlamp unit arranged on either the left or right side as the vehicular lamp 10.

  The vehicular lamp 10 includes a lamp body 12 having a recess opened forward, and a translucent front cover 14 that closes the opening of the lamp body 12. The lamp body 12 and the front cover 14 constitute a lamp housing 16. An internal space of the lamp housing 16 is formed as a lamp chamber 18.

  In the lamp chamber 18, a laser light source 22 including a first wavelength conversion member 20, a reflector 24, a support member 26, an optical axis adjustment mechanism 28, a second wavelength conversion member 30, a holder 32, and a projection lens 34 are disposed. Yes.

  The laser light source 22 is, for example, a so-called CAN package type laser diode (LD) module, and includes a semiconductor laser element 36 such as a laser diode. The first wavelength conversion member 20 is provided at the exit of the laser light source 22. Details will be described later with reference to FIGS.

  The laser light source 22 is installed on the support member 26 via the first substrate 38. That is, the first substrate 38 is attached on the support member 26, and the laser light source 22 is disposed thereon. The first substrate 38 may have a role of heat transfer from the laser light source 22 to the support member 26, positioning of the laser light source 22 with respect to the support member 26, and / or power supply to the laser light source 22.

  The reflector 24 is disposed above and facing the exit of the laser light source 22, that is, the first wavelength conversion member 20. The reflector 24 is attached to the support member 26 and is held at an appropriate position with respect to the laser light source 22.

  The reflector 24 includes a first reflecting surface 40 and a second reflecting surface 42. Both the first reflecting surface 40 and the second reflecting surface 42 are complete reflecting surfaces, and are formed by vapor deposition of a metal material such as aluminum. The reflector 24 is provided as a single reflecting member having these two reflecting surfaces.

  The first reflecting surface 40 is formed to reflect white light emitted from the laser light source 22 to the front of the lamp. Therefore, the 1st reflective surface 40 is formed in the paraboloid or other curved surface shape. The white light reflected by the first reflecting surface 40 goes to the front cover 14, passes through the front cover 14, and is emitted out of the vehicle lamp 10.

  The first reflecting surface 40 is disposed away from the straight light path 43 that goes straight from the semiconductor laser element 36 to the outside of the laser light source 22 through the emission port. In other words, the first reflecting surface 40 does not exist immediately above the exit of the laser light source 22 and is disposed avoiding the exit optical axis of the laser light source 22. A reflector recess 44 that is recessed upward is formed at the center of the reflector 24, and the first reflecting surface 40 is formed so as to surround the reflector recess 44. Light emitted from the laser light source 22 can enter the reflector recess 44.

  The second reflecting surface 42 is disposed so as to reflect the light traveling along the straight light path 43 and direct it toward the second wavelength conversion member 30. The light reflected by the second reflecting surface 42 is directed downward with respect to the direction deviated from the light reflected by the first reflecting surface 40, for example, the light reflected by the first reflecting surface 40. More specifically, the second reflecting surface 42 is formed so as to reflect the light traveling along the straight light path 43 and collect it on the second wavelength conversion member 30. Therefore, the 2nd reflective surface 42 is formed in the paraboloid or other curved surface shape. The second reflecting surface 42 may be formed so as to collimate or diffuse the reflected light.

  The second reflecting surface 42 is disposed immediately above the emission port of the laser light source 22 and is located on the emission optical axis of the laser light source 22. The second reflecting surface 42 is provided at the center of the reflector 24 so as to close the reflector recess 44 instead of the first reflecting surface 40. A part of the second reflection surface 42 may be a reflection surface connection region 46 that connects the second reflection surface 42 to the first reflection surface 40. The reflection surface connection region 46 may be arranged so that light does not directly enter from the laser light source 22.

  A light distribution pattern adjusting member such as a projection lens and a shade is provided in the optical path of white light between the first reflecting surface 40 and the front cover 14 so that the vehicle lamp 10 can form a desired light distribution pattern. It may be provided. As such a light distribution pattern adjusting member, an appropriate known configuration can be appropriately adopted. Moreover, a light distribution pattern adjusting member may be provided in the optical path between the second reflecting surface 42 and the front cover 14 as necessary.

  The support member 26 supports the laser light source 22 and connects the laser light source 22 to the optical axis adjustment mechanism 28. The support member 26 is made of metal and includes a heat radiating part (also referred to as a heat sink) 48 for releasing heat generated by the laser light source 22 and a support plate 50 that supports the heat radiating part 48. The heat radiating portion 48 is attached to a substantially central portion of the support plate 50 and is disposed in front of the support plate 50.

  The optical axis adjustment mechanism 28 includes a leveling actuator 52 and a pivot 54. The leveling actuator 52 is attached to the lower part of the support plate 50 via a screw, and the pivot 54 is attached to the upper part of the support plate 50. Thus, the support member 26 is supported by the lamp body 12 via the optical axis adjustment mechanism 28. The optical axis adjustment mechanism 28 can tilt the support member 26 with respect to the lamp body 12 by driving the leveling actuator 52. Accordingly, the laser light source 22 and the reflector 24 are tilted, and the optical axis of the illumination light can be adjusted. The specific configuration of the optical axis adjustment mechanism 28 is not limited to this, and an appropriate known configuration can be adopted as appropriate.

  Unlike the first wavelength conversion member 20, the second wavelength conversion member 30 is disposed outside the laser light source 22. The second wavelength conversion member 30 is disposed outside the optical path of white light reflected by the first reflecting surface 40.

  The second wavelength conversion member 30 is installed on the holder 32 via the second substrate 56. The holder 32 is attached to the front end of the heat radiating portion 48 of the support member 26. The second substrate 56 and the second wavelength conversion member 30 thereon are disposed on the holder 32 so as to be adjacent to the installation surface of the first substrate 38 in the heat radiating portion 48. The second substrate 56 may have a reflection surface that directs light incident on the second wavelength conversion member 30 from the second reflection surface 42 and light emitted from the second wavelength conversion member 30 toward the projection lens 34.

  The projection lens 34 is provided as an optical member that directs the light from the second wavelength conversion member 30 to the front of the lamp. The light emitted from the second wavelength converting member 30 and passing through the projection lens 34 passes through the front cover 14 and is emitted out of the vehicle lamp 10. The projection lens 34 is configured to direct the light emitted from the second wavelength conversion member 30 to the front of the lamp so as to at least partially overlap the white light reflected by the first reflecting surface 40. The holder 32 has a lower portion extending forward with respect to the second substrate 56. The lower end portion of the projection lens 34 is fixed to the front end portion of the holder 32 extending in this manner.

  2 and 3 are diagrams schematically showing an internal structure of the laser light source 22 according to the embodiment. In addition to the first wavelength conversion member 20 and the semiconductor laser element 36 described above, the laser light source 22 includes a condenser lens 58 and a light source housing 62 having an emission port 60. The straight light path 43 corresponds to the optical axis of the laser light source 22 and is the strongest direction of the emitted light from the laser light source 22.

  The semiconductor laser element 36 is disposed at the bottom of the light source casing 62 and is accommodated in the light source casing 62. The semiconductor laser element 36 faces the emission port 60 with the condenser lens 58 interposed therebetween. The condensing lens 58 condenses the light emitted from the semiconductor laser element 36 onto the first wavelength conversion member 20. The first wavelength conversion member 20 is fixed to the emission port 60 so as to fill the emission port 60. The first wavelength conversion member 20 is formed in a layer shape so as to block the emission port 60, and is firmly fixed to the emission port 60 so as not to be easily detached from the emission port 60. In this way, the laser light source package is configured.

  The first wavelength conversion member 20 is configured to emit light having a wavelength different from that of the excitation light when receiving the excitation light emitted from the semiconductor laser element 36. The first wavelength conversion member 20 emits light having at least one wavelength longer than the wavelength of the excitation light. The first wavelength conversion member 20 includes a phosphor that emits fluorescence upon receiving excitation light. The laser light source 22 emits illumination light of a predetermined color from the emission port 60. The illumination light exits from the exit port 60 over the first angle range θ1 around the straight light path 43, that is, the optical axis. Since light is diffused by the first wavelength conversion member 20, the first angle range θ1 is relatively wide.

  For example, the semiconductor laser element 36 emits blue laser light as excitation light. The first wavelength conversion member 20 includes a phosphor that converts the wavelength of blue laser light into yellow light. A part of the incident blue laser light is converted into yellow light by the first wavelength conversion member 20 and emitted. The remaining blue laser light passes through the first wavelength conversion member 20. White light is obtained by mixing yellow light and blue laser light.

  Alternatively, the semiconductor laser element 36 may emit ultraviolet laser light as excitation light. The first wavelength conversion member 20 may include a first phosphor that converts the wavelength of ultraviolet laser light into blue light and a second phosphor that converts the wavelength of ultraviolet laser light into yellow light. The incident ultraviolet laser light is wavelength-converted into blue light and yellow light, and white light is obtained by mixing them.

  The combination of the semiconductor laser element 36 and the first wavelength conversion member 20 in the laser light source 22 is not limited to the above, and various other well-known configurations for obtaining light having a desired illumination color may be appropriately employed. Can do.

  Similar to the first wavelength conversion member 20, the second wavelength conversion member 30 shown in FIG. 1 is configured to emit light having a wavelength different from that of the excitation light when receiving the excitation light emitted from the semiconductor laser element. The second wavelength conversion member 30 is configured to perform the same wavelength conversion action on the excitation light as the first wavelength conversion member 20. For example, the second wavelength conversion member 30 is formed of the same material as the first wavelength conversion member 20. When the first wavelength conversion member 20 includes a phosphor that converts the wavelength of blue laser light into yellow light, the second wavelength conversion member 30 also includes a phosphor that converts the wavelength of blue laser light into yellow light.

  FIG. 3 shows a state where the first wavelength conversion member 20 is not present at the emission port 60. As described above, the first wavelength conversion member 20 is designed so as not to be easily detached from the emission port 60. However, due to impacts caused by vibrations of the vehicle or the like, aging deterioration, etc., it may fall off from the exit port 60, be displaced from the original mounting position, be completely or partially melted, or be partially missing, and be completely or partially The possibility that the part disappears from the position where it should be cannot be completely denied.

  In such a case, the excitation light emitted from the semiconductor laser element 36 is emitted from the emission port 60 along the straight light path 43 without acting on the first wavelength conversion member 20. The excitation light extends over the second angle range θ2 around the straight light path 43, that is, the optical axis. The second angle range θ2 is narrower than the first angle range θ1. In the unlikely event that the first wavelength conversion member 20 is damaged or dropped out, excitation light with high directivity is directed toward the reflector 24.

  4 and 5 are schematic views for explaining an optical path inside the vehicular lamp 10 according to the first embodiment. FIG. 4 shows a state in which the vehicular lamp 10 is operating normally. FIG. 5 shows a state where the first wavelength conversion member 20 as shown in FIG. FIG. 6 illustrates a light distribution pattern formed by the vehicular lamp 10 according to the first embodiment.

  Reference is first made to FIG. As described above, the laser light source 22 emits the white light W from the first wavelength conversion member 20 to the first angle range θ1. An outer edge portion of the white light W is directed to the first reflection surface 40, and a central portion of the white light W is directed to the second reflection surface 42.

  The first reflecting surface 40 reflects the incident white light W. The white light W reflected by the first reflecting surface 40 is collimated and travels toward the front cover 14. The region through which the white light W passes is called a main optical path 64. The white light W reflected by the first reflecting surface 40 travels along the main optical path 64, passes through the front cover 14, and exits from the vehicle lamp 10.

  On the other hand, the second reflecting surface 42 also reflects the incident white light W. The second reflecting surface 42 reflects light emitted in the second angle range θ2 illustrated in FIG. As described above, the second angle range θ <b> 2 is a range that is narrower than the first angle range θ <b> 1 and includes the straight light path 43. The white light W reflected by the second reflecting surface 42 is collected and travels toward the second wavelength conversion member 30. The region through which the white light W passes is called a sub optical path 66. The second reflecting surface 42 is formed so that the reflected light is converged by the second wavelength conversion member 30. The incident white light W is diffused or reflected by the second wavelength conversion member 30 or the second substrate 56 and travels toward the front cover 14 through the projection lens 34. In this way, the white light W reflected by the second reflecting surface 42 travels along the sub optical path 66, passes through the front cover 14, and is emitted out of the vehicle lamp 10.

  FIG. 6 shows a light distribution pattern formed in front of the vehicle in the state shown in FIG. This is a high beam light distribution pattern, and is an example of a light distribution pattern that is particularly suitable for use as a light distribution pattern for ultra-far-field illumination. As shown in the figure, the first portion 68 of the light distribution pattern reflected by the first reflecting surface 40 and irradiated to the front of the lamp through the main light path 64 is reflected by the second reflecting surface 42 by the function of the projection lens 34. It overlaps with the second portion 70 of the light distribution pattern irradiated to the front of the lamp through the auxiliary light path 66. The second portion 70 is wider than the first portion 68, and the first portion 68 is located at the center of the second portion 70. A first portion 68 is included in the second portion 70.

  In this way, the white light W that has passed through the sub optical path 66 is combined with the white light W that has passed through the main optical path 64. Not only the light from the first reflecting surface 40 but also the light from the second reflecting surface 42 is used for illumination. Compared with the conventional typical configuration in which part of the light is discarded through the reflector transmission hole, the luminous flux utilization factor is improved. Further, the white light W can be illuminated in a wider range than the configuration including only the first reflecting surface 40.

  Please refer to FIG. When there is no first wavelength conversion member 20, the excitation light E travels straight from the laser light source 22 through the emission port 60 toward the reflector 24. Since the excitation light E is in the second angle range θ2, it is reflected by the second reflecting surface 42. The excitation light E reflected by the second reflecting surface 42 travels along the sub optical path 66. That is, the excitation light E is converged on the second wavelength conversion member 30 by the second reflecting surface 42.

  Since the second wavelength conversion member 30 can perform the same wavelength conversion action on the excitation light E as the first wavelength conversion member 20, the incident wavelength of the excitation light E is white light W (or yellow light Y) by the second wavelength conversion member 30. ). The white light W travels toward the front cover 14 through the projection lens 34. Thus, despite the absence of the first wavelength conversion member 20, the white light W passes through the front cover 14 and is emitted out of the vehicle lamp 10. Irradiation of the excitation light E to the front of the lamp is prevented.

  Therefore, the vehicular lamp 10 according to the first embodiment can achieve both fail-safe and effective use of light flux.

  The second reflecting surface 42 is formed so as to reflect the light traveling along the straight light path 43 and collect it on the second wavelength conversion member 30. By condensing, more excitation light E can be incident on the second wavelength conversion member 30 and the excitation light E can be converted into safer white light W or yellow light Y. That is, it is possible to more reliably prevent the excitation light E from leaking out of the lamp.

  The vehicular lamp 10 is an optical member that specifically directs the light emitted from the second wavelength conversion member 30 to the front of the lamp so as to at least partially overlap the white light W reflected by the first reflecting surface 40, specifically, projection. A lens 34. By superimposing in this way, the luminous flux utilization factor is improved.

  The second wavelength conversion member 30 is disposed outside the optical path of the white light W reflected by the first reflecting surface 40, that is, the main optical path 64. Therefore, the second wavelength conversion member 30 does not interfere with the white light W that travels along the main optical path 64. Similarly, it is desirable that other elements arranged in the secondary optical path 66 such as the projection lens 34 are also arranged outside the main optical path 64.

(Second Embodiment)
7 and 8 are vertical sectional views schematically showing a schematic structure of the vehicular lamp 10 according to the second embodiment. FIG. 7 shows a state where the vehicular lamp 10 according to the second embodiment is operating normally. FIG. 8 shows a state where the first wavelength conversion member 20 as shown in FIG.

  The vehicular lamp 10 according to the second embodiment is different from the first embodiment in the specific configuration of the reflector 24 and the sub optical path 66. The vehicular lamp 10 according to the second embodiment is common to the first embodiment in terms of the principle of operation. Therefore, in order to avoid redundancy, description of the same configuration is omitted as appropriate.

  Unlike the first embodiment, the second reflection surface 42 is formed as a semi-transmissive reflection region so-called a half mirror. The first reflecting surface 40 is formed as a complete reflecting surface as in the first embodiment, and reflects incident light to the main optical path 64. Therefore, a part (for example, half) of the light incident on the second reflecting surface 42 is reflected toward the sub optical path 66, and the remaining part (for example, the remaining half) of the light incident on the second reflecting surface 42 is shown in FIG. As shown by a broken line in FIG. 8, the light passes through the second reflecting surface 42. Here, the entire area of the second reflective surface 42 is a semi-transmissive reflective region, but only a partial region of the second reflective surface 42 may be a semi-transmissive reflective region.

  The vehicular lamp 10 includes a sensor 72 that detects excitation light E transmitted through the second reflecting surface 42. The sensor 72 includes a light receiving element such as a photodiode, and is configured to detect light having the same wavelength as the excitation light E. In order to avoid erroneously detecting the white light W transmitted through the second reflecting surface 42 as the excitation light, the sensor 72 is configured to be able to distinguish the white light W and the excitation light E, or the white light It is configured not to detect W. The sensor 72 is disposed behind the reflector 24. An excitation light detection chamber 74 that houses the sensor 72 is defined above the second reflecting surface 42.

  Thus, since the sensor 72 is provided, the leakage of the excitation light E from the laser light source 22 can be detected. When the excitation light E is detected by the sensor 72, the laser light source 22 can be stopped.

  The transflective region and the sensor 72 described above may be applied to the vehicular lamp 10 according to the first embodiment.

  The 2nd wavelength conversion member 30 is comprised as a transparent member which sealed the fluorescent substance layer. Therefore, the light directed to the second wavelength conversion member 30 by the second reflecting surface 42 can pass through the second wavelength conversion member 30. The white light W is transmitted through the second wavelength conversion member 30 or diffused by the second wavelength conversion member 30. The excitation light E is converted into white light W or yellow light Y by the second wavelength conversion member 30. The second wavelength conversion member 30 is attached to the front end portion of the support member 26.

  The light transmitted through the second wavelength conversion member 30 travels to the second reflector 76. The second reflector 76 may be attached to the support member 26. The second reflector 76 is provided as an optical member that directs the light from the second wavelength conversion member 30 forward of the lamp. In this way, the projection lens 34 in the first embodiment can be replaced with the second reflector 76.

  Similarly to the first embodiment, the vehicular lamp 10 according to the second embodiment can achieve both fail-safe and effective use of light flux.

(Third embodiment)
FIG. 9 is a vertical sectional view schematically showing a schematic structure of the vehicular lamp 10 according to the third embodiment. The vehicular lamp 10 according to the third embodiment is the same as the first embodiment except that a polarizing member 78 is added.

  The polarizing member 78 is, for example, a polarizing filter, and can block excitation light. Since the excitation light is raw laser light, the polarization state is aligned. Therefore, by arranging the polarizing member 78 that does not transmit light of this specific polarization state in the optical path, it is possible to prevent the excitation light from being emitted outside the lamp. On the other hand, the polarization state of white light is not uniform due to diffusion in the phosphor. Therefore, white light is not shielded by the polarizing member 78.

  The polarizing member 78 is disposed at an arbitrary position in the lamp so as to cross the main optical path 64, the sub optical path 66, or the optical path of white light. For example, as illustrated, the polarizing member 78 may be disposed in the vicinity of the exit of the laser light source 22. Alternatively, the polarizing member 78 may be disposed between the reflector 24 and the front cover 14.

  The present invention is not limited to the above-described embodiments and modifications, and it is possible to combine the embodiments and modifications, and to add various modifications such as various design changes based on the knowledge of those skilled in the art. Therefore, embodiments and modifications in which such combinations or further modifications are added are also included in the scope of the present invention. The above-described embodiments and modifications, and new embodiments resulting from the combination of the above-described embodiments and modifications and the following modifications, combine the effects of the combined embodiments, modifications, and further modifications. Have.

  In the above-described embodiment, the reflector 24 is provided as a single reflecting member having both the first reflecting surface 40 and the second reflecting surface 42, but is not limited thereto. The two reflecting surfaces may be provided in separate reflectors, and the vehicular lamp 10 includes a first reflector that includes the first reflecting surface 40 and a second reflector that includes the second reflecting surface 42 and is separate from the first reflector. A reflector may be provided.

  DESCRIPTION OF SYMBOLS 10 Vehicle lamp, 20 1st wavelength conversion member, 22 Laser light source, 24 Reflector, 30 2nd wavelength conversion member, 34 Projection lens, 36 Semiconductor laser element, 40 1st reflective surface, 42 2nd reflective surface, 43 Straight light path , 60 exit port, 72 sensor, 76 second reflector, 78 polarizing member.

Claims (6)

A semiconductor laser element that emits excitation light, an emission port, and a first wavelength conversion member that is fixed to the emission port so as to fill the emission port and emits light having a first wavelength different from at least the excitation light when receiving the excitation light A laser light source that emits white light from the exit port, and
A second wavelength conversion member disposed outside the laser light source and emitting at least the light of the first wavelength when receiving the excitation light;
A first reflecting surface disposed off the straight light path that travels straight from the semiconductor laser element to the outside of the laser light source through the emission port, and reflects the white light forward of the lamp;
A vehicular lamp, comprising: a second reflecting surface arranged to reflect light traveling along the straight light path and direct the light toward the second wavelength conversion member.   2. The vehicular lamp according to claim 1, wherein the second reflecting surface is formed to reflect light traveling along the straight light path and collect the light on the second wavelength conversion member.   The optical member for directing the light emitted from the second wavelength conversion member toward the front of the lamp so as to at least partially overlap the white light reflected by the first reflecting surface. The vehicle lamp as described in 2.   4. The vehicular lamp according to claim 1, wherein the second wavelength conversion member is disposed outside an optical path of white light reflected by the first reflecting surface. 5. The second reflective surface includes a transflective region,
5. The vehicular lamp according to claim 1, further comprising a sensor that is disposed behind the second reflecting surface and detects excitation light transmitted through the transflective region.   The vehicular lamp according to any one of claims 1 to 5, further comprising a polarizing member disposed in the optical path of the white light and capable of blocking the excitation light.

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