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WO2019049589A1 - Dispositif de source de lumière et dispositif de projection de lumière - Google Patents

Dispositif de source de lumière et dispositif de projection de lumière Download PDF

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Publication number
WO2019049589A1
WO2019049589A1 PCT/JP2018/029717 JP2018029717W WO2019049589A1 WO 2019049589 A1 WO2019049589 A1 WO 2019049589A1 JP 2018029717 W JP2018029717 W JP 2018029717W WO 2019049589 A1 WO2019049589 A1 WO 2019049589A1
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WIPO (PCT)
Prior art keywords
light
laser
light source
laser light
source device
Prior art date
Application number
PCT/JP2018/029717
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English (en)
Japanese (ja)
Inventor
森本　廉
公博 村上
麻生　淳也
博隆 上野
古賀　稔浩
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to JP2019540838A priority Critical patent/JPWO2019049589A1/ja
Publication of WO2019049589A1 publication Critical patent/WO2019049589A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/0239—Combinations of electrical or optical elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters

Definitions

  • the present disclosure relates to a light source device that emits light and a light projecting device using the light source device.
  • a light source device that generates light of a predetermined wavelength by irradiating a wavelength conversion member with light emitted from a laser light source.
  • this light source device for example, light that is wavelength-converted and diffused by the wavelength conversion member and light that is diffused without wavelength conversion by the wavelength conversion member are combined, and light of a predetermined color such as white light is generated. It is generated.
  • a light source device is used, for example, as a light source device of a vehicular headlamp.
  • Patent Document 1 discloses a light projector (headlight) that projects a light image generated by light conversion means (phosphor) onto a road by a light projection optical system.
  • the projector comprises six laser light sources and two micro mirrors. Three laser light sources are assigned to one micro mirror.
  • the three laser beams incident on one micro mirror are irradiated on the light emitting surface of the light conversion means at positions mutually displaced in the direction perpendicular to the scanning direction.
  • the micro mirror vibrates only around a single axis. As the micromirrors vibrate, the beam spots displaced relative to each other in the direction perpendicular to the scanning direction scan the light emitting surface of the light conversion means.
  • the three laser beams scanned by one micro mirror are positioned on the light emitting surface of the light conversion means at a position between the three laser beams scanned by the other micro mirror.
  • Patent Document 1 In the configuration of Patent Document 1 described above, six positions displaced in the direction perpendicular to the scanning direction are scanned with laser light emitted from each laser light source. If there is a fluctuation in intensity, band-like unevenness occurs in the light distribution from the wavelength conversion member. In addition, even when one of the optical systems for guiding the plurality of laser light sources or the respective laser beams to the wavelength conversion member is deviated due to impact such as vibration or temporal change, the light distribution is also uneven similarly. Become.
  • the present disclosure provides a light source device capable of smoothly controlling the output of each laser light source while suppressing occurrence of unevenness in light distribution, and a light projecting device using the same. To aim.
  • a first aspect of the present disclosure relates to a light source device.
  • the light source device includes a plurality of laser light sources, a wavelength conversion member, an optical deflector, an optical system, a position detector, and a controller.
  • the wavelength conversion member converts the wavelength of the laser light emitted from the plurality of laser light sources into another wavelength and diffuses the wavelength-converted light.
  • the light deflector scans laser light emitted from the plurality of laser light sources on the incident surface of the wavelength conversion member.
  • the optical system is a plurality of beams arranged in the scanning direction on the incident surface of the wavelength conversion member by a plurality of laser beams respectively emitted from a plurality of laser light sources and at least one spot is separated from the other spots. Form a spot.
  • the position detector receives specularly reflected light of the plurality of laser beams specularly reflected on the incident surface of the wavelength conversion member with respect to the scanning range on the incident surface, and outputs a detection signal according to the light receiving position and the received light amount Do.
  • the controller controls the plurality of laser light sources based on the detection signal from the position detector.
  • the beam spots are arranged in the scanning direction and are separated from each other on the incident surface of the wavelength conversion member, even if a failure such as a failure occurs in any one laser light source, There is no unevenness in light distribution.
  • the specularly reflected light of the plurality of laser beams specularly reflected on the incident surface of the wavelength conversion member is received by the position detector for all scanning ranges on the incident surface, so the detection signal from the position detector The output of each laser light source can be controlled smoothly.
  • a second aspect of the present disclosure relates to a light projecting device.
  • the light projecting device includes the light source device according to the first aspect, and a projection optical system that projects the light diffused by the wavelength conversion member.
  • the same effect as the first aspect can be exhibited.
  • the output of each laser light source can be smoothly controlled while suppressing the occurrence of unevenness in light distribution.
  • FIG. 1A is a side view showing a configuration of a light projecting device according to an embodiment.
  • FIG. 1B is a plan view showing the configuration of the light projecting device according to the embodiment.
  • FIG. 2 is a perspective view showing the configuration and arrangement of the laser light source according to the embodiment.
  • FIG. 3 is a view schematically showing a convergence state of the laser beam after being reflected by the cylindrical mirror according to the embodiment.
  • FIG. 4A is a view for explaining a configuration for separating beam spots in the scanning direction on the incident surface of the wavelength conversion member according to the embodiment.
  • FIG. 4B is a view for explaining a configuration for separating beam spots in the scanning direction on the incident surface of the wavelength conversion member according to the embodiment.
  • FIG. 4A is a view for explaining a configuration for separating beam spots in the scanning direction on the incident surface of the wavelength conversion member according to the embodiment.
  • FIG. 4B is a view for explaining a configuration for separating beam spots in the scanning direction on the incident surface of the wavelength conversion
  • FIG. 5A is a diagram showing a configuration example for adjusting the incident direction of the laser light to the cylindrical lens according to the embodiment.
  • FIG. 5B is a diagram showing a configuration example for adjusting the incident direction of the laser light to the cylindrical lens according to the embodiment.
  • FIG. 6A is a diagram showing another configuration example for adjusting the incident direction of the laser light to the cylindrical lens according to the embodiment.
  • FIG. 6B is a view schematically showing the arrangement of beam spots of each laser beam formed on the incident surface of the wavelength conversion member according to the configuration example of FIG. 6A.
  • FIG. 7A is a side view schematically showing the configuration of the wavelength conversion member according to the embodiment.
  • FIG. 7B is a plan view schematically showing the configuration of the wavelength conversion member according to the embodiment.
  • FIG. 8A is a diagram for describing a configuration of a position detector according to an embodiment and a method for generating a position detection signal.
  • FIG. 8B is a cross-sectional view schematically showing the configuration of the position detector according to the embodiment.
  • FIG. 9A is a view schematically showing the movement of the beam spot on the incident surface of the wavelength conversion member according to the embodiment.
  • FIG. 9B is a view schematically showing the movement of a specularly reflected light spot on the position detector when the beam spot moves as shown in FIG. 9A according to the embodiment.
  • FIG. 10 is a circuit block diagram showing a main circuit configuration of the light source device according to the embodiment.
  • FIG. 11A is a flowchart showing control for acquiring the light receiving position and the received light amount of each regular reflection light spot according to the embodiment.
  • FIG. 11B is a flowchart showing control for acquiring the light receiving position and the received light amount of each regular reflection light spot according to the embodiment.
  • FIG. 11C is a view schematically showing a scanning state of a specularly reflected light spot on the light receiving surface of the position detector at the time of check scanning according to the embodiment.
  • FIG. 12A is a diagram showing parameters for output control of the laser light source according to the embodiment.
  • FIG. 12B is a timing chart showing an example of output control of the laser light source according to the embodiment.
  • FIG. 13A is a view showing parameters for output control of the laser light source according to the embodiment.
  • FIG. 13B is a timing chart showing another example of output control of the laser light source according to the embodiment.
  • FIG. 14A is a side view showing the configuration of a light projecting device according to a modification.
  • FIG. 14B is a plan view showing the configuration of a light projecting device according to a modification.
  • FIG. 15A is a view for explaining a configuration for separating beam spots in the scanning direction on the incident surface of the wavelength conversion member according to the modification.
  • FIG. 15B is a view schematically showing a scanning state of a specularly reflected light spot on the light receiving surface of the position detector at the time of check scanning according to the modification.
  • This coordinate axis is a global coordinate system (Fig. 1A, Fig. 1B, Fig. 14A, Fig. 14B) in which the light projection direction of the light source device and the light projection device is Z axis, and the light emission direction or reflection of optical components to be described.
  • FIG. 15B is appropriately used in accordance with the description, and therefore, the two do not necessarily coincide.
  • FIG. 1A and FIG. 1B are a side view and a plan view showing the configuration of the light projecting device according to the embodiment, respectively.
  • the light projecting device 1 includes a light source device 2 for generating light and a projection optical system 3 for projecting the light generated by the light source device 2.
  • the projection optical system 3 includes two lenses 3a and 3b, and the lenses 3a and 3b condense light from the light source device 2 and project the light to a target area.
  • the projection optical system 3 does not necessarily have to be composed of two lenses 3a and 3b. For example, it may be a single lens or may be equipped with two or more lenses or mirrors.
  • the projection optical system 3 may be configured to condense the light from the light source device 2 by a concave mirror.
  • the light source device 2 includes three laser light sources 11a to 11c, three collimator lenses 12a to 12c, two reflecting prisms 13a and 13b, a cylindrical lens 14, a reflecting mirror 15, an optical deflector 16, and a cylindrical mirror 17 and the wavelength conversion member 18.
  • the cylindrical lens 14 and the cylindrical mirror 17 constitute a condensing optical system for causing the laser light emitted from the laser light sources 11a to 11c to converge on the incident surface of the wavelength conversion member 18.
  • the above-described members constituting the light source device 2 are installed together with the projection optical system 3 on a base (not shown).
  • the laser light sources 11a to 11c respectively emit laser light in a blue wavelength band (for example, 450 nm).
  • the laser light sources 11a to 11c are made of, for example, semiconductor lasers.
  • the laser light sources 11a to 11c are laser light sources of the same type.
  • the wavelength of the laser light emitted from the laser light sources 11a to 11c can be changed as appropriate.
  • the laser light sources 11a to 11c are not necessarily single emitter semiconductor lasers having a single light emitting area, and may be, for example, multi-emitter semiconductor lasers having a plurality of light emitting areas in one light emitting element.
  • the laser light sources 11a to 11c do not necessarily emit laser light of a single wavelength band, and may be, for example, a multi-emission semiconductor laser in which a plurality of light emitting elements are mounted on one substrate.
  • the collimator lenses 12a to 12c convert the laser beams emitted from the laser light sources 11a to 11c into parallel beams, respectively.
  • the reflecting prisms 13 a and 13 b respectively reflect the laser beams transmitted through the collimator lenses 12 b and 12 c in the direction toward the cylindrical lens 14.
  • a plate-like reflection mirror may be used instead of the reflection prisms 13a and 13b.
  • the laser light sources 11b and 11c are disposed to face each other.
  • the reflecting prisms 13a and 13b are disposed such that a gap is generated in the direction in which the laser light sources 11b and 11c face each other, that is, in the X-axis direction.
  • the laser light sources 11a to 11c are arranged such that the emission optical axis is included in one plane parallel to the XZ plane.
  • the laser light emitted from the laser light source 11a is converted into parallel light by the collimator lens 12a, and then travels to the cylindrical lens 14 through the gap between the reflecting prisms 13a and 13b.
  • the optical axes of the opposed laser light sources 11b and 11c are bent in directions parallel to the XZ plane by the reflecting prisms 13a and 13b.
  • the laser beams emitted from the laser light sources 11a to 11c are incident on the incident surface of the cylindrical lens 14 at mutually different positions in the X-axis direction.
  • three laser beams can be approached without being limited by the package and cap outer shape of the laser light sources 11a to 11c.
  • the optical system after the cylindrical lens 14 can be made compact, and the influence of the aberration of the optical system can be reduced.
  • the size of the mirror 16 a of the light deflector 16 can be reduced, and the increase in size and power consumption of the light deflector 16 can be suppressed.
  • the laser light emitted from the laser light source 11 a is incident on the central position of the incident surface of the cylindrical lens 14.
  • the laser beams emitted from the laser light sources 11 b and 11 c are respectively incident at positions deviated from the central position of the incident surface of the cylindrical lens 14 by a predetermined distance in the X axis positive and negative directions.
  • the cylindrical lens 14 is a curved surface in which the incident surface is curved only in the direction parallel to the XZ plane.
  • the entrance surface of the cylindrical lens 14 is aspheric, and the exit surface of the cylindrical lens 14 is a plane perpendicular to the Z axis.
  • the exit surface of the cylindrical lens 14 may also be a curved surface curved in a direction parallel to the XZ plane.
  • the entrance surface of the cylindrical lens 14 may be flat and the exit surface may be curved.
  • the cylindrical lens 14 is disposed such that the generatrix of the incident surface is perpendicular to a plane including the optical axes of the three laser beams incident on the incident surface, that is, parallel to the Y-axis direction.
  • the cylindrical lens 14 has a convergence power only in the direction in which the three optical axes of the laser light sources 11a to 11c at the incident position are aligned, ie, in the X-axis direction.
  • the laser light emitted from the laser light sources 11a to 11c is converged by the cylindrical lens 14 on the incident surface of the wavelength conversion member 18 in the scanning direction of the laser light.
  • beam spots of three laser beams are formed on the incident surface of the wavelength conversion member 18 so as to be aligned in the scanning direction and separated from each other.
  • the reflection mirror 15 bends the optical axes of the three laser beams transmitted through the cylindrical lens 14 in the direction parallel to the YZ plane.
  • the three laser beams are reflected by the reflection mirror 15 and then enter the mirror 16 a of the light deflector 16. Note that, depending on the layout of the optical system from the cylindrical lens 14 to the wavelength conversion member 18, the reflection mirror 15 may be omitted. In this case, the three laser beams transmitted through the cylindrical lens 14 directly enter the mirror 16 a of the light deflector 16.
  • the light deflector 16 includes a mirror 16a, and changes the traveling direction of the laser beam reflected by the reflection mirror 15 by rotating the mirror 16a about a rotation axis L1 parallel to the Z axis.
  • the incident surface of the mirror 16a is a plane.
  • the mirror 16a is, for example, a high reflectance mirror in which a dielectric multilayer film is formed on a glass plate.
  • the mirror 16a is disposed parallel to the XZ plane at the neutral position.
  • the light deflector 16 is configured of, for example, a MEMS (Micro Electro Mechanical Systems) mirror.
  • the cylindrical mirror 17 is a reflecting surface whose incident surface is curved in a concave direction only in the direction parallel to the YZ plane.
  • the incident surface of the cylindrical mirror 17 is spherical, but may be aspheric.
  • the cylindrical mirror 17 is disposed such that the generatrix of the incident surface is parallel to a plane including the optical axes of the three laser beams incident on the incident surface, that is, parallel to the X-axis direction.
  • the cylindrical mirror 17 has convergent power only in the direction perpendicular to the direction in which the three optical axes of the laser light sources 11a to 11c at the incident position are aligned, ie, in the direction parallel to the YZ plane.
  • the laser light emitted from the laser light sources 11a to 11c is converged by the cylindrical mirror 17 on the incident surface of the wavelength conversion member 18 in the direction perpendicular to the scanning direction of the laser light.
  • the cylindrical mirror 17 may be replaced with a transmission type cylindrical lens.
  • the three laser beams incident on the cylindrical lens are subjected to the converging action in the direction parallel to the YZ plane by the cylindrical lens, and then enter the wavelength conversion member 18.
  • the incident surface of the mirror 16a may be replaced with a cylindrical mirror surface.
  • the cylindrical mirror 17 is omitted or is a flat reflection mirror, and the three laser beams incident on the cylindrical lens 14 have a converging action in a direction parallel to the YZ plane by the mirror 16a of the cylindrical surface. After receiving, it passes through the reflection mirror or directly enters the wavelength conversion member 18 as it is.
  • the wavelength conversion member 18 is disposed at a position where the laser light reflected by the cylindrical mirror 17 is incident.
  • the wavelength conversion member 18 is a rectangular plate-like member, and is installed so that the incident surface is parallel to the XY plane. As described above, when the mirror 16a pivots about the pivot axis L1, the wavelength conversion member 18 is scanned in the longitudinal direction by the laser beam.
  • the wavelength conversion member 18 converts a part of the incident laser light into a wavelength different from that of the blue wavelength band and diffuses it in the Z-axis direction. Other laser beams not subjected to wavelength conversion are diffused by the wavelength conversion member 18 in the Z-axis direction. Thus, the diffused light of two types of wavelengths is combined to generate light of a predetermined color. The light of each wavelength is taken into the projection optical system 3 and projected onto the target area.
  • part of the laser light is converted into light in the yellow wavelength band by the wavelength conversion member 18.
  • the diffused light in the yellow wavelength band after wavelength conversion and the scattered light in the blue wavelength band not subjected to wavelength conversion are synthesized to generate white light.
  • the wavelength after wavelength conversion may not be in the yellow wavelength band, and the color of the light generated may be a color other than white.
  • the configuration of the wavelength conversion member 18 will be described later with reference to FIGS. 7A and 7B.
  • FIG. 2 is a perspective view showing the configuration and arrangement of the laser light source 11a.
  • the structure of the light emitting element 110 with which the laser light source 11a was equipped is shown by FIG.
  • the configuration of the light emitting elements of the other laser light sources 11b and 11c is the same as that shown in FIG.
  • Upper and lower surfaces of the light emitting element 110 are electrodes 111 and 112.
  • the laser beam 130 is emitted from the active layer 113 sandwiched between the upper and lower cladding layers along the emission optical axis 120.
  • the laser beam 130 spreads in a direction parallel to the active layer 113 and in a direction perpendicular to the active layer 113 at a predetermined radiation angle.
  • the radiation angle in the direction perpendicular to the active layer 113 is larger than the radiation angle in the direction parallel to the active layer 113. Therefore, the beam shape of the emitted laser beam 130 is an ellipse.
  • the major axis of this ellipse is called the fast axis
  • the minor axis of the ellipse is called the slow axis.
  • the laser light source 11 a is disposed such that the fast axis is parallel to the convergence direction of the cylindrical lens 14.
  • the remaining two laser light sources 11 b and 11 c are arranged such that the fast axis of the laser light is parallel to the convergence direction of the cylindrical lens 14 at the incident position of the cylindrical lens 14.
  • the laser light is more likely to converge in the direction along the fast axis than the direction along the slow axis. This is because the width of the light emitting region in the fast axis direction at the end face of the laser light sources 11a to 11c (semiconductor laser) is generally narrower than that of the slow axis. Therefore, by arranging the laser light sources 11a to 11c as described above, the laser beams emitted from the laser light sources 11a to 11c can be converged efficiently by the cylindrical lens 14.
  • FIG. 3 is a view schematically showing the convergence state of the laser beam after being reflected by the cylindrical mirror 17.
  • broken lines from the cylindrical mirror 17 toward the wavelength conversion member 18 indicate the laser beams 130a to 130c emitted from the laser light sources 11a to 11c, and the ellipses indicated by the broken lines indicate the beam spots BSa to BSa of these laser lights. It shows BSc.
  • the laser beam source 11a is arranged such that the three beam spots BSa to BSc are aligned in the scanning direction of the laser beam and separated from each other on the incident surface 18a of the wavelength conversion member 18. 11c and the cylindrical lens 14 (condensing optical system) are adjusted.
  • the size of beam spots BSa to BSc is defined by an area of 1 / e 2 or more of the intensity peak.
  • the sizes of the beam spots BSa to BSc may be defined by full width at half maximum (FWHM). In this case, even if a part of the region of 1 / e 2 or more of the intensity peak overlaps, it can be said that the beam spots BSa to BSc are separated from each other if the beam spots defined by FWHM do not overlap. .
  • the method of defining the beam size is the same as in the modification described later.
  • FIGS. 4A and 4B are diagrams for explaining the configuration for separating the beam spots BSa to BSc in the scanning direction on the incident surface 18a of the wavelength conversion member 18, respectively.
  • the illustration of the optical member disposed between the cylindrical lens 14 and the wavelength conversion member 18 is omitted.
  • the arrangement of the laser light sources 11a to 11c or the arrangement of the reflecting prisms 13a and 13b is adjusted so that the laser beams 130a to 130c enter the cylindrical lens 14 in a nonparallel state.
  • the laser beam 130a emitted from the laser light source 11a is incident on the cylindrical lens 14 with the optical axis parallel to the Z axis
  • the laser beams 130b and 130c emitted from the laser light sources 11b and 11c are Respectively, the light is incident on the cylindrical lens 14 in a state in which the optical axis is slightly inclined in the positive and negative directions of the X-axis from the state in parallel with the Z-axis.
  • the cylindrical lens 14 has no aberration, and the cylindrical lens 14 is configured to converge incident parallel light into one focal line. That is, the cylindrical lens 14 is a single focus cylindrical lens. Further, the optical system is set such that the optical path length from the cylindrical lens 14 to the wavelength conversion member 18 and the focal length of the cylindrical lens 14 are substantially the same.
  • the convergence position of the laser beams 130a to 130c is the incident surface 18a of the wavelength conversion member 18.
  • they are mutually displaced in the scanning direction (X-axis direction).
  • the beam spots BSa to BSc of the laser beams 130a to 130c are aligned in the scanning direction on the incident surface 18a of the wavelength conversion member 18 and separated from each other.
  • the laser beams 130a to 130c may be incident on the cylindrical lens 14 in parallel with each other as shown in FIG. 4B.
  • the beam spots BSa to BSc of the laser beams 130a to 130c are positioned on the incident surface 18a of the wavelength conversion member 18 so as to be aligned in the scanning direction and separated from each other.
  • the adjustment of the incident direction of the laser beams 130b and 130c to the cylindrical lens 14 is performed, for example, on the reflection surface of the reflecting prisms 13a and 13b with respect to the emission optical axis of the laser light sources 11b and 11c, as shown in FIG. It can be done by adjusting the tilt.
  • the laser light sources 11b and 11c are disposed such that the emission light axes are parallel to the X axis, and the light emission axes of the laser light sources 11b and 11c are opposite to the reflection surfaces of the reflection prisms 13a and 13b.
  • the reflective prisms 13a and 13b are disposed such that the angle ⁇ is slightly larger than 45 degrees.
  • the laser light source 11a is disposed such that the emission optical axis is parallel to the Z axis.
  • the laser beam 130a emitted from the laser light source 11a is incident on the cylindrical lens 14 in parallel to the Z axis, and the laser beams 130b and 130c emitted from the laser light sources 11b and 11c are , And enters the cylindrical lens 14 in a state slightly inclined from the state parallel to the Z axis.
  • adjustment of the incident direction of the laser beams 130b and 130c with respect to the cylindrical lens 14 is performed, for example, as shown in FIG. 5B, with the emission optical axes of the laser light sources 11b and 11c parallel to the X axis. Can also be performed by tilting in a direction parallel to the XZ plane.
  • the reflecting prisms 13a and 13b are disposed such that the reflecting surface has an inclination of 45 degrees with respect to the X axis, and the emission optical axes of the laser light sources 11b and 11c and the reflection of the reflecting prisms 13a and 13b, for example.
  • the laser light sources 11 b and 11 c are disposed such that the angles ⁇ with the surface are slightly larger than 45 degrees, respectively.
  • the collimator lenses 12b and 12c are arranged such that the optical axes thereof are aligned with the emission optical axes of the laser light sources 11b and 11c.
  • the laser light source 11a is disposed such that the emission optical axis is parallel to the Z axis.
  • the laser beam 130a emitted from the laser light source 11a is incident on the cylindrical lens 14 in parallel to the Z axis, and the laser beams 130b and 130c emitted from the laser light sources 11b and 11c are , And enters the cylindrical lens 14 in a state slightly inclined from the state parallel to the Z axis.
  • the arrangement of both the laser light sources 11b and 11c and the reflecting prisms 13a and 13b may be adjusted.
  • the laser light sources 11b and 11c are tilted so that the optical axes of the laser beams 130b and 130c approach the optical axis of the laser beam 130a as the incident surface of the cylindrical lens 14 is approached.
  • the laser beams 130b and 130c intersect and the laser beam 130b is shifted to the X axis negative side with respect to the laser beam 130a.
  • the laser beam 130c is converged to a position deviated to the X axis positive side with respect to the laser beam 130a. Therefore, also according to this configuration, the three beam spots BSa to BSc can be arranged on the incident surface 18a of the wavelength conversion member 18 so as to be aligned in the scanning direction of the laser light and separated from each other.
  • the laser light sources 11b and 11c are disposed so that the emission optical axis is parallel to the X axis, and the reflection prisms 13a and 13b are disposed such that the reflection surface is inclined 45 degrees with respect to the X axis. Ru.
  • the laser light source 11a is disposed such that the emission optical axis is parallel to the Z axis.
  • the laser beams 130a to 130b enter the cylindrical lens 14 with the optical axes parallel to each other.
  • the optical path length from the cylindrical lens 14 to the wavelength conversion member 18 is set to be approximately the same as the focal length of the cylindrical lens 14, in the incident surface 18 a of the wavelength conversion member 18
  • the width of the three laser beams 130a to 130c (beam spots BSa to BSc) in the scanning direction of the laser beam, that is, the X axis direction is compressed to about the width of the focal line generated by the converging action of the cylindrical lens 14.
  • the optical path length from the cylindrical mirror 17 to the wavelength conversion member 18 may be the same as or different from the focal length of the cylindrical mirror 17.
  • the optical path length from the cylindrical mirror 17 to the wavelength conversion member 18 is set to be equal to the focal length of the cylindrical mirror 17, the laser light converges to the minimum width proportional to the focal length of the cylindrical mirror 17.
  • the laser beam is less likely to be converged than the fast axis.
  • the light is incident on the wavelength conversion member 18 at a predetermined incident angle (referred to as ⁇ 1) from the direction parallel to the slow axis.
  • ⁇ 1 a predetermined incident angle
  • the width of the beam in the slow axis direction is expanded to 1 / cos ⁇ 1 times the minimum width proportional to the focal length of the cylindrical mirror 17. For this reason, laser light is converged with a certain width in the slow axis direction.
  • the width of the beam spots BSa to BSc in the slow axis direction is cylindrical.
  • the width can be designed wider than the minimum width at the focal position of the mirror 17.
  • the beam spots BSa to BSc of the three laser beams 130a to 130c are perpendicular to the scanning direction of the laser beam, that is, parallel to the YZ plane. You can design freely in a wide range. Therefore, on the incident surface 18a of the wavelength conversion member 18, the beam spots BSa to BSc of the three laser beams 130a to 130c have a linear shape extending in the direction perpendicular to the scanning direction of the laser beam.
  • the optical path length from the cylindrical mirror 17 to the wavelength conversion member 18 is set to be different from the focal length of the cylindrical mirror 17 good.
  • the wavelength conversion member 18 can be scanned with a wide width in the direction intersecting the scanning direction, the wavelength conversion member 18 can be efficiently scanned with each laser beam.
  • FIG. 7A is a side view schematically showing the configuration of the wavelength conversion member 18.
  • the wavelength conversion member 18 has a configuration in which the reflective film 202 and the phosphor layer 203 are laminated on the upper surface of the substrate 201.
  • the substrate 201 is made of, for example, silicon, aluminum nitride ceramic, sapphire glass or the like.
  • the reflective film 202 is configured by laminating a first reflective film 202a and a second reflective film 202b.
  • the first reflective film 202a is, for example, a metal film such as Ag, an Ag alloy, or Al.
  • the second reflective film 202b also has a function of protecting the first reflective film 202a from oxidation or the like as well as reflection.
  • One or more layers of dielectrics such as SiN, AlN.
  • the reflective film 202 does not necessarily have to be composed of the first reflective film 202a and the second reflective film 202b, and may have a single layer or a structure in which three or more layers are stacked.
  • the phosphor layer 203 is formed by fixing the phosphor particles 203a with a binder 203b.
  • the phosphor particles 203a emit fluorescence in the yellow wavelength band by being irradiated with laser light in the blue wavelength band emitted from the laser light sources 11a to 11c.
  • As the phosphor particles 203a for example, (Y n G d 1-n ) 3 (Al m Ga 1-m ) 5 O 12 : Ce (0.5 ⁇ n ⁇ 1, 0.5) having an average particle diameter of 1 ⁇ m to 30 ⁇ m. ⁇ m ⁇ 1) is used.
  • the binder 203b a transparent material mainly containing silsesquioxane such as polymethyl silsesquioxane is used.
  • the laser light that has entered inside can be scattered more efficiently and can be extracted from the light source device 2. Further, by the presence of the void 203c in the vicinity of the second reflective film 202b, it is possible to effectively scatter the laser light and the fluorescence while reducing the energy loss due to the surface of the second reflective film 202b.
  • the phosphor layer 203 further contains a filler 203 d for enhancing the strength and the heat resistance.
  • the laser light emitted from the laser light sources 11a to 11c is irradiated to the excitation region R1 shown in FIG. 7A, and is scattered and absorbed on the surface or inside of the phosphor layer 203.
  • a part of the laser light is converted into light of a yellow wavelength band by the phosphor particles 203 a and emitted from the phosphor layer 203.
  • the other part of the laser light is scattered without being converted to light in the yellow wavelength band, and is emitted from the phosphor layer 203 as light in the blue wavelength band.
  • the light of each wavelength band is scattered while propagating in the phosphor layer 203, and is thus emitted from the light emitting region R2 slightly wider than the excitation region R1.
  • FIG. 7B is a plan view schematically showing the configuration of the wavelength conversion member 18.
  • the wavelength conversion member 18 has a rectangular shape elongated in the X-axis direction in plan view.
  • the wavelength conversion member 18 is scanned with laser light in the X-axis direction by rotating the mirror 16 a of the light deflector 16.
  • the mirror 16a is rotated in a predetermined angular range in both directions from a neutral position parallel to the XZ plane.
  • BS indicates the beam spot of each laser beam emitted from the laser light sources 11a to 11c as described above.
  • the three beam spots BS reciprocate on the incident surface 18a of the wavelength conversion member 18 in the width W1.
  • the reciprocating movement of the beam spot BS is indicated by a straight arrow, but since the laser beam is incident on the wavelength conversion member 18 from an oblique direction, the movement locus of the actual beam spot BS is X It becomes a slightly curved locus in which both ends in the positive and negative directions of the X axis are displaced in the negative direction of the Y axis with respect to the central position in the axial direction.
  • the area of the beam spot BS on the incident surface 18a corresponds to the excitation area R1 of FIG. 7A. While the beam spot BS moves on the incident surface 18a of the wavelength conversion member 18, diffused light of the blue wavelength band and diffused light of the yellow wavelength band from the light emission area R2 slightly wider than the area of the beam spot BS in the positive Z-axis direction It is emitted.
  • the two wavelength bands of light thus emitted are taken in by the projection optical system 3 shown in FIGS. 1A and 1B and projected onto the target area. Thereby, white light in which the light of the blue wavelength band and the light of the yellow wavelength band are combined is projected from the light projecting device 1 to the target area.
  • the position detector 19 is installed at a position where the laser light (hereinafter, referred to as “regular reflection light”) specularly reflected by the incident surface 18 a of the wavelength conversion member 18 is received.
  • the position detector 19 is disposed such that the specularly reflected light is incident on the central position in the X-axis direction of the incident surface of the position detector 19 when the mirror 16 a of the light deflector 16 is in the neutral position.
  • the position detector 19 receives specularly reflected light with respect to the scanning range on the incident surface of the wavelength conversion member 18, and outputs a detection signal according to the light receiving position and the received light amount.
  • the position detector 19 has a long light receiving surface in the X-axis direction so as to be able to receive specularly reflected light with respect to the scanning range on the incident surface of the wavelength conversion member 18.
  • the position detector 19 is made of, for example, a PSD (Position Sensitive Detector). Besides, the position detector 19 may have a configuration in which photodetectors are arranged on an array, or may be an imaging device such as a CCD (Charge Coupled Device).
  • PSD Position Sensitive Detector
  • CCD Charge Coupled Device
  • FIG. 8A is a diagram for describing a configuration of the position detector 19 and a method of generating a position detection signal.
  • 8B is a cross-sectional view schematically showing the configuration of the position detector 19. As shown in FIG.
  • the position detector 19 has a structure in which a P-type resistive layer which also serves as a light receiving surface and a resistive layer is formed on the surface of an N-type high-resistance silicon substrate. Electrodes EX1 and EX2 for outputting a photocurrent in the lateral direction are formed in the resistance layer on the front side, and a common electrode EX3 is formed in the resistance layer on the back side. The photocurrents flowing into the electrodes EX1 and EX2 are output from the terminals 19b and 19c.
  • the light receiving surface 19a of the position detector 19 When the light receiving surface 19a of the position detector 19 is irradiated with the regular reflection light (the regular reflection light spot RB), a charge proportional to the light quantity is generated at the light reception position of the regular reflection light (the regular reflection light spot RB). This charge reaches the resistance layer as a photocurrent, is divided in inverse proportion to the distance to each of the electrodes EX1 and EX2, and is output from the terminals 19b and 19c connected to the electrodes EX1 and EX2.
  • the photocurrents output from the terminals 19b and 19c have sizes divided in inverse proportion to the distances Lx1 and Lx2 from the light reception position of the regular reflection light to the electrodes EX1 and EX2. . Therefore, the light receiving position of the specularly reflected light in the X-axis direction on the light receiving surface can be detected based on the current value of the photocurrent output from the terminals 19 b and 19 c.
  • the specularly reflected light spot RB is irradiated at the position shown in FIG. 8A.
  • the lateral coordinates Px of the light receiving position relative to the lateral center position Lmx of the light receiving surface 19a are Ix1 and Ix2, respectively, the current values of the photocurrents output from the electrodes EX1 and EX2.
  • the distance between EX1 and EX2 is Lx, it is calculated by the following equation.
  • the formula (1) is calculated to obtain the specularly reflected light spot RB on the light receiving surface 19a.
  • a position detection signal (coordinates Px) indicating the position can be calculated. Further, by adding the current values Ix1 and Ix2 of the photocurrent to each other, it is possible to acquire the received light amount of the specularly reflected light.
  • FIG. 9A is a view schematically showing the movement of the beam spots BS1 to BS3 on the incident surface 18a of the wavelength conversion member 18.
  • FIG. 9B is a view schematically showing the movement of the specularly reflected light spots RB1 to RB3 on the light receiving surface 19a of the position detector 19 when the beam spots BS1 to BS3 move as shown in FIG. 9A.
  • Wm is the center position in the X-axis direction of the incident surface 18a.
  • the three beam spots that scan the incident surface 18a of the wavelength conversion member 18 are referred to as beam spots BS1, BS2, and BS3 in order from the X-axis positive side.
  • the beam spots BS1, BS2, and BS3 correspond to the beam spots BSb, BSa, and BSc illustrated in FIGS. 4A and 4B, respectively.
  • the specularly reflected light spots RB1, RB2, and RB3 are beam spots of specularly reflected light in which the laser beams of the beam spots BS1, BS2, and BS3 are specularly reflected on the incident surface 18a of the wavelength conversion member 18, respectively.
  • the specularly reflected light spots RB1 to RB3 move along the light receiving surface 19a of the position detector 19 as shown in FIG. Move like.
  • the lateral movement positions of the specularly reflected light spots RB1 to RB3 correspond one-to-one to the movement positions of the beam spots BS1 to BS3 in the X-axis direction on the incident surface 18a.
  • the specularly reflected light spots RB1 to RB3 move the light receiving surface 19a of the position detector 19 in the lateral direction in the range of the width Lw.
  • the laser light source corresponding to the specularly reflected light spot to be detected is turned on, and the other laser light sources are turned off.
  • the laser light sources of the regular reflection spots are turned on sequentially from the regular reflection light spot RB3 on the left side of FIG. 9B.
  • the calculation of the equation (1) is performed, and the light receiving position of each specularly reflected light spot is detected.
  • the current values Ix1 and Ix2 are added to each other to detect the amount of light received by each regular reflection light spot.
  • the light receiving position of each specularly reflected light spot and the method of detecting the amount of light received will be described later with reference to FIGS. 11A to 11C.
  • FIG. 10 is a circuit block diagram showing a main circuit configuration of the light source device 2 according to the embodiment.
  • the light source device 2 includes a controller 301, laser drive circuits 302a to 302c, a mirror drive circuit 303, a position detection circuit 304, and an interface 305 as the configuration of the circuit section. .
  • the controller 301 includes an arithmetic processing circuit such as a CPU (Central Processing Unit) and a memory, and controls each part according to a predetermined control program.
  • the laser drive circuits 302a to 302c drive the laser light sources 11a to 11c according to the control signal from the controller 301, respectively.
  • the mirror drive circuit 303 drives the mirror 16 a of the light deflector 16 in accordance with the control signal from the controller 301.
  • the position detection circuit 304 calculates the position detection signal by the calculation of the equation (1) based on the current values Ix1 and Ix2 output from the position detector 19, and adds the current values Ix1 and Ix2 to each other to calculate the light amount. Calculate the signal.
  • the position detection circuit 304 outputs the calculated position detection signal and light amount signal to the controller 301.
  • the interface 305 is, for example, an input / output circuit for the controller 301 to transmit / receive a signal to / from an external control circuit such as a control circuit on the vehicle side.
  • the controller 301 controls the laser light sources 11a to 11c and the light deflector 16 so that the light irradiated to the target area from the projection optical system 3 has a predetermined light distribution pattern in the target area. That is, the controller 301 controls the light deflector 16 so that the scanning range of the three beam spots BS1 to BS3 has the width W1 shown in FIG. 9A, and the light distribution pattern in the target area is a predetermined light distribution pattern As described above, the control of turning on / off the laser light sources 11a to 11c corresponding to the three beam spots BS1 to BS3 is performed.
  • the three beam spots BS1 to BS3 are arranged in line in the scanning direction and are separated from each other.
  • the amounts of light of the beam spots BS1 to BS3 and the positions and intervals of the beam spots BS1 to BS3 may change due to changes over time, vibrations or shocks transmitted to the light source device 2, and the like. Therefore, in order to appropriately perform the above control, the controller 301 needs to detect the decrease in the light amount of the beam spot and the fluctuation of the position and the interval of the beam spot for each beam spot as needed. In other words, it is necessary for the controller 301 to perform control by detecting the received light amount of each regular reflection light spot, the light receiving position, and the interval between the regular reflection light as needed.
  • FIG. 11A and FIG. 11B are flowcharts showing control for acquiring the light receiving position and the received light amount of each regular reflection light spot, respectively.
  • the controller 301 when the light source device 2 is activated (S11), the controller 301 performs check scanning for detecting the light reception positions and the light reception amounts of the regular reflection light spots RB1 to RB3 (S12). Then, the controller 301 obtains the light reception positions and the light reception amounts of the regular reflection light spots RB1 to RB3 based on the position detection signal and the light amount signal input from the position detection circuit 304 at the time of the check scanning (S13) .
  • the controller 301 receives the light reception positions and the light reception amounts of the regular reflection light spots RB1 to RB3.
  • a check scan is performed to detect (S22).
  • the controller 301 obtains the light reception positions and the light reception amounts of the regular reflection light spots RB1 to RB3 based on the position detection signal and the light amount signal input from the position detection circuit 304 at the time of this check scan (S23) .
  • the check timing in step S21 is set to, for example, a fixed cycle (for example, several seconds) from the activation of the light source device 2.
  • FIG. 11C is a diagram schematically showing the scanning state of the specularly reflected light spots RB1 to RB3 on the light receiving surface 19a of the position detector 19 at the time of check scanning (S12 and S22 in FIGS. 11A and 11B).
  • the spots filled in black indicate that the specularly reflected light spot is in the lighted state
  • the broken and white spots indicate that the specularly reflected light spot is in the extinguished state.
  • the controller 301 controls the light deflector 16 so that the regular reflection light spots RB1 to RB3 move the light receiving surface 19a at a constant speed. Then, the controller 301 controls the laser light sources 11a to 11c so that the specularly reflected light spots RB1 to RB3 are sequentially turned on at a predetermined cycle.
  • the controller 301 drives only the laser light source 11c corresponding to the regular reflection light spot RB3 in a pulse shape, and turns on only the regular reflection light spot RB3.
  • the controller 301 drives only the laser light source 11a corresponding to the regular reflection light spot RB2 in a pulse shape at a predetermined time interval from the driving of the laser light source 11c. Only the light spot RB2 is turned on.
  • the controller 301 drives only the laser light source 11a corresponding to the regular reflection light spot RB1 in a pulse shape at a predetermined time interval from the driving of the laser light source 11a. Only the spot RB1 is turned on.
  • each laser light source is driven by pulse signals of the same level and the same time width. Therefore, if the output characteristics of the respective laser light sources are the same, the values of the light quantity signal at the time of the irradiation of the respective specularly reflected light spots become the same.
  • the controller 301 controls the position detection signal and the light amount of the specularly reflected light spot from the position detection circuit 304 when lighting each specularly reflected light spot in steps S13 and S23 of FIGS. 11A and 11B.
  • a signal is acquired, and the light receiving position and the light receiving amount on the light receiving surface 19a of the position detector 19 are obtained for each specularly reflected light spot.
  • the controller 301 determines the specularly reflected light spots RB1 based on the light receiving positions acquired for the specularly reflected light spots RB1 to RB3, and the scanning speed by the light deflector 16 and the time interval for lighting the specularly reflected light spots RB1 to RB3. Calculate the interval between ... and RB3.
  • the controller 301 determines that the light distribution pattern from the wavelength conversion member 18 has a predetermined pattern using the light receiving position of each regular reflection light spot acquired by the above processing and the interval between the reflection light spots.
  • the laser light sources 11a to 11c are controlled so that At this time, at the same time, the controller 301 controls the laser light sources 11a to 11c so that the laser light is emitted with the output of the predetermined level based on the light reception amounts of the regular reflection light spots.
  • the controller 301 executes control on the laser light sources 11a to 11c by updating the light reception amount, the light reception position, and the interval of each regular reflection light spot each time the timing of the check scan comes.
  • FIG. 12B is a timing chart showing an example of output control of the laser light sources 11a to 11c.
  • the top row of FIG. 12B shows the waveform of the drive signal for driving the mirror 16a of the light deflector 16.
  • the second to fourth rows from the top of FIG. 12B show the specularly reflected light spots RB1 to RB3, respectively.
  • the waveforms of control signals for driving the corresponding laser light sources are shown.
  • 12B is the waveform of the drive signal of the laser light source 11b
  • the waveform of the third stage from the top of FIG. 12B is the waveform of the drive signal of the laser light source 11a.
  • the lower waveform is the waveform of the drive signal of the laser light source 11c.
  • FIG. 12A shows respective parameters used in the output control of FIG. 12B.
  • the scan in the right direction is set to “scan 1”
  • the scan in the left direction is set to “scan 2”.
  • the dashed arrows indicate the scanning direction and scanning range of the specularly reflected light spot.
  • the scanning speed is constant.
  • the interval X1 between the regular reflection light spots RB1 and RB2 and the interval X2 between the regular reflection light spots RB2 and RB3 are successively updated by the processing shown in FIGS. 11A to 11C.
  • the light reception amounts of the specularly reflected light spots RB1 to RB3 when the respective laser light sources are driven by pulse signals of a predetermined level and a predetermined time width are detected and sequentially updated. .
  • a non-light emission interval Xoff for stopping light emission is set at both ends of the scanning range.
  • non-light emitting sections corresponding to the non-light emitting section X off are set at both ends of the width W1 shown in FIG. 9A.
  • the output of each laser light source is controlled such that the amount of emitted light increases at the center of the width W1 shown in FIG. 9A.
  • the controller 301 applies output control signals shown in the second and subsequent stages of FIG. 12B to the respective laser light sources in synchronization with the drive signal of the mirror 16a.
  • the controller 301 calculates and sets the intervals of the waveforms of the output control signals according to the calculation equation appended to FIG. 12B based on the parameters shown in FIG. 12A. Further, the controller 301 sets each output control signal so that the output of each laser light source becomes a predetermined same level based on the received light amount of each regular reflection light spot acquired by the processing shown in FIGS. 11A to 11C. Set the maximum value of the waveform.
  • light is projected to the target area with a light distribution pattern in which the width in the horizontal direction is somewhat restricted and the central light amount is increased.
  • FIG. 13B is a timing chart showing another example of output control of the laser light sources 11a to 11c. Similar to FIG. 12B, the top row of FIG. 13B shows the waveform of a drive signal for driving the mirror 16a of the light deflector 16. The second to fourth rows from the top of FIG. The waveforms of control signals for driving the laser light sources respectively corresponding to RB1 to RB3 are shown.
  • FIG. 13A shows each parameter used in the output control of FIG. 13B as in FIG. 12A.
  • the non-lighting interval X ADB in which light emission is stopped is set in the middle of the scanning range.
  • a non-light emitting period corresponding to the light off period X ADB is set in part of the width W1 shown in FIG. 9A.
  • the light source device 2 is controlled to turn off the position of the oncoming vehicle, the oncoming vehicle, or the person. Be instructed.
  • This instruction is input to the controller 301 via the interface 305 of FIG.
  • the controller 301 controls the laser drive circuits 302a to 302c to turn off the laser light sources 11a to 11c in a predetermined section in the width W1 in accordance with an instruction from the vehicle side.
  • the turn-off section X ADB shown in FIG. 13A corresponds to a section to turn off the laser light sources 11a to 11c by this control.
  • a section corresponding to the light off section ADB is indicated by hatching.
  • control is performed such that light is projected onto the target area with uniform intensity. Therefore, the output control signal for each laser light source has a rectangular waveform.
  • the controller 301 applies an output control signal shown in the second or lower stage of FIG. 13B to each laser light source in synchronization with the drive signal of the mirror 16a.
  • the controller 301 calculates and sets the intervals of the waveforms of the output control signals according to the calculation equation appended to FIG. 13B based on the parameters shown in FIG. 13A.
  • the intervals of the waveforms of the output control signals are the same as the intervals of the waveforms of the output control signals shown in FIG. 12B.
  • the controller 301 sets a part of the waveform of each output control signal to the zero level in accordance with the turn-off period X ADB .
  • the controller 301 calculates and sets the timing and period for setting a part of the waveform to the zero level based on the parameters shown in FIG. 13A according to the calculation equation appended to FIG. 13B.
  • the controller 301 sets the level of the rectangular waveform of each output control signal based on the light quantity of each regular reflection light spot acquired by the processing shown in FIGS. 11A to 11C.
  • light is projected to the target area with a light distribution pattern in which the width in the horizontal direction is somewhat restricted and light emission is stopped in a part of the section.
  • the wavelength No unevenness occurs in the light distribution from the conversion member 18.
  • the specularly reflected light of the plurality of laser beams specularly reflected on the incident surface 18 a of the wavelength conversion member 18 is received by the position detector 19 with respect to all scanning ranges on the incident surface 18 a. The output of each laser light source can be smoothly controlled by the detection signal from
  • the controller 301 drives the laser light sources 11a to 11c independently to receive the light receiving positions and the light receiving positions of the regular reflection lights (regular reflection light spots RB1 to RB3) from the position detector 19. A detection signal corresponding to the light amount is acquired. As a result, the light receiving position and the light receiving amount of the regular reflection light (regular reflection light spots RB1 to RB3) separated from each other in the scanning direction can be accurately detected.
  • the controller 301 executes control to drive the laser light sources 11a to 11c independently and acquire a detection signal from the position detector 19 when the light source device 2 is activated.
  • the controller 301 executes control to drive the laser light sources 11a to 11c independently and acquire a detection signal from the position detector 19 when the light source device 2 is activated.
  • each specularly reflected light specularly reflected light spots RB1 to RB3
  • the light receiving position and the light receiving amount can be detected.
  • the controller 301 performs control to drive the laser light sources 11a to 11c independently and acquire a detection signal from the position detector 19 every predetermined period after the light source device 2 is activated. Run. In this way, during actual operation of light emission, it is possible to sequentially acquire the light reception positions and the light reception amounts of the regular reflection lights (regular reflection light spots RB1 to RB3). Thus, even when the light receiving positions and the light receiving amounts of the regular reflection lights (regular reflection light spots RB1 to RB3) change during actual light emission operation, the respective laser light sources can be controlled with high accuracy.
  • acquisition of the detection signal (light reception position, light reception light quantity) after starting of the light source device 2 may not necessarily be performed in a fixed cycle, and the number of times of acquisition of detection signals may not be plural. Acquisition of detection signals after activation of the light source device 2 is performed at a predetermined timing at which the possibility of fluctuations in the light reception positions and light reception amounts of the regular reflection lights (regular reflection light spots RB1 to RB3) may be assumed. Just do it. For example, instead of the control in FIG. 11B or together with this control, acquisition control of detection signals (light receiving position, received light quantity) is executed at the timing when it is detected that a large vibration or impact is applied to the light source device 2. May be
  • the controller 301 generates light in a predetermined light distribution pattern from the wavelength conversion member 18 based on the detection signal from the position detector 19.
  • the laser light sources 11a to 11c are controlled. As described above, by individually controlling the laser light sources 11a to 11c based on the detection signal, the resolution of the light distribution pattern from the wavelength conversion member 18 can be enhanced, and a more sophisticated light distribution pattern can be realized.
  • the controller 301 performs control to stop light emission in a part of the scanning range with respect to the wavelength conversion member 18 (light-off section X ADB ).
  • the controller 301 controls the turn-off timing and the turn-off period of each of the laser light sources such that the turn-off of the laser light sources 11a to 11c matches with a partial range (turn-off section X ADB ) in which light emission is stopped.
  • the boundary of the non-lighting section X ADB can be cleared, and light extinguishing of a part of the range can be satisfactorily performed.
  • the controller 301 obtains the intervals X1 and X2 of the specularly reflected light on the light receiving surface 19a of the position detector 19 based on the detection signal from the position detector 19. It is preferable to set the extinguishing timing of the laser light sources 11a to 11c based on the acquired intervals X1 and X2. In this way, the turn-off timings of the laser light sources 11a to 11c can be set smoothly and accurately.
  • the beam spots BS1 to BS3 can be separated and arranged in the scanning direction on the incident surface 18a of the wavelength conversion member 18 while realizing a compact optical system.
  • FIG. 14A and FIG. 14B are respectively a side view and a plan view showing a configuration of a light projecting device 1 according to a modification.
  • the number of laser light sources arranged in the light source device 2 is increased to four. That is, the laser light source 11d is newly added as compared with the above embodiment.
  • the laser light source 11d is the same as the laser light sources 11a to 11c.
  • the laser light emitted from the laser light source 11 d is converted into parallel light by the collimator lens 12 d.
  • the laser light source 11a and the laser light source 11d are disposed to face each other.
  • the laser light sources 11a and 11d are arranged such that the fast axis is parallel to the Z axis, as with the laser light sources 11b and 11c.
  • the reflection prism 13c is disposed in the emission direction of the laser light source 11a
  • the reflection prism 13d is disposed in the emission direction of the laser light source 11d.
  • the optical axis of the laser light source 11a and the optical axis of the laser light source 11d are bent in directions parallel to the XZ plane by the reflecting prisms 13c and 13d so as to be directed to the cylindrical lens 14, respectively.
  • the reflecting prisms 13c and 13d are disposed without a gap in the X-axis direction. Compared to the above embodiment, the gap between the reflecting prisms 13a and 13b is widened.
  • the laser beams emitted from the laser light sources 11a and 11d are bent along the optical axes by the reflecting prisms 13c and 13d, and then enter the cylindrical lens 14 through the gap between the reflecting prisms 13a and 13b.
  • the optical axes of the laser light sources 11 a to 11 d are included in one plane perpendicular to the generatrix of the cylindrical lens 14, that is, one plane parallel to the XZ plane.
  • the positions of the laser light sources 11a to 11d in the Y-axis direction are adjusted.
  • the incident surface 18a of the wavelength conversion member 18 is positioned at the position of the focal length of the cylindrical lens 14 as in the above embodiment.
  • beam spots of four laser beams are formed on the incident surface of the wavelength conversion member 18 so as to align in the scanning direction and to be separated from each other.
  • the four laser beams 130a to 130d can be obtained by causing the laser beams 130a to 130d emitted from the laser light sources 11a to 11d to be incident on the cylindrical lens 14 in a nonparallel state.
  • the beam spots BSa to BSd can be aligned in the scanning direction and separated from each other on the incident surface 18a of the wavelength conversion member 18. In this case, a single-focus cylindrical lens without aberration is used as the cylindrical lens 14.
  • the laser beams 130a to 130d can be incident on the cylindrical lens 14 in a nonparallel state. it can.
  • the beam spots BSa to BSd may be arranged in the scanning direction on the incident surface 18a of the wavelength conversion member 18 and separated from each other by using the cylindrical lens 14 having aberration in advance. Good. Further, as in the case of FIGS. 6A and 6B, the laser beams 130a to 130d are made to intersect with each other in the optical path from the cylindrical lens 14 to the wavelength conversion member 18, and the beam spots BSa to BSd of the laser beams 130a to 130c are obtained. Alternatively, they may be separated from each other on the incident surface 18 a of the wavelength conversion member 18.
  • the position detector 19 is configured to receive the laser beams 130a to 130d with respect to all scanning ranges on the incident surface 18a of the wavelength conversion member 18 and output a detection signal according to the light reception position and the light reception amount. .
  • a laser drive circuit for driving the laser light source 11d is added to the circuit block of FIG.
  • the controller 301 drives the laser light sources 11a to 11d independently as shown in FIG. 15B in steps S12 and S22 in FIG. 11A and FIG. 11B, and acquires detection signals from the position detector 19 The light receiving position of the light, the light receiving amount, and the interval of the regular reflection light are acquired.
  • RB1 to RB4 are regular reflection light spots by the laser light emitted from the laser light sources 11b, 11a, 11d and 11c, respectively.
  • the laser light sources 11b, 11a, 11d, and 11c are individually driven such that the regular reflection light spots are sequentially irradiated from the leftmost regular reflection light spot RB4.
  • the controller 301 controls the laser light sources 11a to 11d based on the acquired light reception positions of the regularly reflected light, the received light amount and the interval of the regularly reflected light, for example, similar to FIGS. 12A, 12B and 13A, 13B. Take control.
  • the beam spot of the laser beam emitted from each laser light source is separated in the scanning direction on the incident surface 18a of the wavelength conversion member 18 in the above embodiment and the modified example, it is in the scanning direction on the incident surface 18a If a plurality of beam spots are formed side by side and spaced apart from one another, several beam spots may overlap on the incident surface 18a.
  • the beam spots BSa and BSb may be overlapped, and two beam spots may be formed on the incident surface 18a of the wavelength conversion member 18 so as to be aligned in the scanning direction and separated from each other.
  • the beam spots BSa and BSb may be overlapped, and three beam spots may be formed on the incident surface 18a of the wavelength conversion member 18 so as to be aligned in the scanning direction and separated from each other.
  • the beam spots BSa and BSb are overlapped, and the beam spots BSc and BSd are further overlapped, and two beam spots are aligned in the scanning direction on the incident surface 18a of the wavelength conversion member 18 It may be formed to be separated from each other.
  • the laser beams superimposed on each other may be made incident on the cylindrical lens 14 so as to be parallel to each other.
  • the cylindrical lens 14 a single-focus cylindrical lens without aberration is used.
  • the mutually overlapping laser beams are made to be incident on the cylindrical lens 14 so as to be parallel to each other. Can be incident on the cylindrical lens 14 in a non-parallel state.
  • the light reception position and the light reception amount of the specularly reflected light corresponding to each laser light source are separately detected, and each laser light source is individually controlled. do it.
  • predetermined control is performed by individually controlling the respective laser light sources. Light distribution pattern can be realized well.
  • the number of beam spots to be overlapped is limited to about two. Thereby, it can suppress that a light density increases excessively, and it can suppress that the luminous efficiency in the wavelength conversion member 18 falls by the temperature quenching effect by light saturation or heat_generation
  • the laser light sources 11a to 11c are individually turned on while scanning the specularly reflected light spots RB1 to RB3 on the light receiving surface 19a, and the light receiving positions and the received light amounts of the specularly reflected light spots RB1 to RB3.
  • the specularly reflected light spots may not necessarily be scanned.
  • the laser light sources 11a to 11c are individually turned on to detect the light reception positions and the light reception amounts of the regular reflection light spots RB1 to RB3. Good.
  • 13A and 13B show the control in the case of turning off part of the scanning range, but it may be control to turn on only part of the scanning range.
  • the laser light source is controlled based on the light receiving positions of the specularly reflected light spots RB1 to RB3 and the received light amounts. However, based on the light receiving positions of the specularly reflected light spots RB1 to RB3.
  • the mirror 16 a of the light deflector 16 may be controlled. For example, the movement range of the regular reflection light (the swing angle of the mirror 16a) is detected based on any one light reception position of the regular reflection light spots RB1 to RB3, and the movement range of the regular reflection light (the swing angle of the mirror 16a)
  • the light deflector 16 may be controlled so as to be appropriate.
  • each laser light source is arranged such that the fast axis of the laser light is parallel to the convergence direction of the cylindrical lens 14, but the arrangement method of the laser light source is necessarily limited to this. It is not something to be done.
  • each laser light source may be arranged such that the slow axis of the laser light is parallel to the convergence direction of the cylindrical lens 14.
  • the fast axis of the laser light is parallel to the convergence direction of the cylindrical lens 14 as in the embodiment and the modifications described above.
  • each laser light source is arranged.
  • the number of laser light sources disposed in the light source device 2 is not limited to the number shown in the above embodiment and the modification, and may be two or five or more.
  • the configuration of the optical system does not necessarily have to be the configuration shown in FIGS. 1A, 1B and 14A, 14B, so that it is aligned in the scanning direction on the incident surface 18a of the wavelength conversion member 18 and separated from each other.
  • Various modifications are possible as long as multiple beam spots can be formed.
  • the condensing optical system does not necessarily have to be divided into the cylindrical lens 14 and the cylindrical mirror 17, and the laser light may be converged in the scanning direction and the direction perpendicular to the scanning direction by one lens.
  • the lens constituting the condensing optical system may be a Fresnel lens or a diffractive lens.
  • the light deflector 16 may be configured to rotate the mirror 16a about two axes perpendicular to each other.
  • the type of phosphor particles 203a contained in the phosphor layer 203 of the wavelength conversion member 18 is not necessarily limited to one type, and for example, the laser beams from the laser light sources 11a to 11d produce fluorescence of different wavelengths.
  • Plural kinds of phosphor particles 203 a may be included in the phosphor layer 203. In this case, light of a predetermined color is generated by the diffused light of the fluorescent light generated from the phosphor particles 203a of each type and the diffused light of the laser light which is not wavelength-converted by the phosphor particles 203a.
  • the wavelength conversion member 18 is not limited to the reflection type, and may be a transmission type.
  • the scanning direction of the laser light may not necessarily be the horizontal direction, and the vertical direction may be the scanning direction of the laser light depending on the required irradiation conditions.
  • the outputs of the respective laser light sources can be smoothly controlled while suppressing the occurrence of unevenness in light distribution. Therefore, the light source device and the light projecting device according to the present disclosure can be used, for example, as a light source device of a vehicle headlamp, and is industrially useful.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Semiconductor Lasers (AREA)

Abstract

L'invention concerne un dispositif de source de lumière pouvant commander la sortie de chaque source de lumière laser de manière régulière tout en éliminant l'apparition d'une irrégularité dans la répartition lumineuse, et un dispositif de projection de lumière utilisant ledit dispositif. Le dispositif de source de lumière comporte : une source de lumière laser ; un élément de conversion de longueur d'onde ; un déflecteur optique destiné à balayer un faisceau laser émis par la source de lumière laser sur une surface incidente de l'élément de conversion de longueur d'onde ; et un système optique destiné à former une pluralité de spots de faisceau sur la surface incidente de l'élément de conversion de longueur d'onde par une pluralité de faisceaux laser émis respectivement par la source de lumière laser de façon à être parallèles dans la direction de balayage et espacés les uns des autres. De plus, le dispositif de source de lumière comporte : un détecteur de position qui reçoit une pluralité de faisceaux laser réfléchis de manière spéculaire à partir de la surface incidente de l'élément de conversion de longueur d'onde relativement à toutes les plages de balayage sur la surface incidente, et qui émet un signal de détection correspondant à la position de la lumière reçue et à la quantité de lumière reçue ; et un dispositif de commande qui commande la source de lumière laser sur la base du signal de détection provenant du détecteur de position.
PCT/JP2018/029717 2017-09-11 2018-08-08 Dispositif de source de lumière et dispositif de projection de lumière WO2019049589A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021015184A1 (fr) * 2019-07-25 2021-01-28 株式会社小糸製作所 Feu de véhicule et phare de véhicule

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011086432A (ja) * 2009-10-14 2011-04-28 Sharp Corp 照明装置、車両用灯具および車両
JP2016507136A (ja) * 2013-02-07 2016-03-07 チザラ リヒトシステーメ ゲーエムベーハーＺｉｚａｌａ Ｌｉｃｈｔｓｙｓｔｅｍｅ ＧｍｂＨ 自動車用の投光器および光分布を生成するための方法
JP2016088425A (ja) * 2014-11-10 2016-05-23 パナソニックＩｐマネジメント株式会社 照明装置と、それを搭載した自動車
WO2016157765A1 (fr) * 2015-03-31 2016-10-06 パナソニックＩｐマネジメント株式会社 Dispositif d'éclairage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011086432A (ja) * 2009-10-14 2011-04-28 Sharp Corp 照明装置、車両用灯具および車両
JP2016507136A (ja) * 2013-02-07 2016-03-07 チザラ リヒトシステーメ ゲーエムベーハーＺｉｚａｌａ Ｌｉｃｈｔｓｙｓｔｅｍｅ ＧｍｂＨ 自動車用の投光器および光分布を生成するための方法
JP2016088425A (ja) * 2014-11-10 2016-05-23 パナソニックＩｐマネジメント株式会社 照明装置と、それを搭載した自動車
WO2016157765A1 (fr) * 2015-03-31 2016-10-06 パナソニックＩｐマネジメント株式会社 Dispositif d'éclairage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021015184A1 (fr) * 2019-07-25 2021-01-28 株式会社小糸製作所 Feu de véhicule et phare de véhicule

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