WO2018150942A1 - Dispositif source de lumière et dispositif de projection de lumière - Google Patents

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

Info

Publication number
WO2018150942A1
WO2018150942A1 PCT/JP2018/003935 JP2018003935W WO2018150942A1 WO 2018150942 A1 WO2018150942 A1 WO 2018150942A1 JP 2018003935 W JP2018003935 W JP 2018003935W WO 2018150942 A1 WO2018150942 A1 WO 2018150942A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
light source
source device
laser light
wavelength conversion
Prior art date
Application number
PCT/JP2018/003935
Other languages
English (en)
Japanese (ja)
Inventor
博隆 上野
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.)
Filing date
Publication date
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to JP2018568122A priority Critical patent/JP7065267B2/ja
Publication of WO2018150942A1 publication Critical patent/WO2018150942A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16—Laser light sources
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/70—Prevention of harmful light leakage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems

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 has been subjected to wavelength conversion by the wavelength conversion member and diffused and light that has been diffused without being subjected to wavelength conversion by the wavelength conversion member are combined to generate light of a predetermined color such as white light. Generated.
  • a light source device is used, for example, as a light source device for a vehicle headlamp.
  • Patent Document 1 the light emitting surface of a phosphor (wavelength conversion member) is scanned with a laser beam by a swingable micromirror to generate an optical image on the light emitting surface, and the generated optical image is converted into an optical system.
  • a vehicle headlamp to be projected onto a road is described.
  • an optical sensor is arranged at a position where the laser beam reflected by the light emitting surface is detected at a predetermined swing position of the micromirror, and the position and movement of the micromirror are detected by a signal from the optical sensor. Is done.
  • Patent Document 1 since the reflected light is incident on the optical sensor only when the tilt angle of the micromirror is at a predetermined angle, the operation state of the micromirror is properly detected in a range other than this angle. I can't. For example, when the reflected light does not enter the optical sensor because the micromirror does not properly respond to the drive signal, the configuration of Patent Document 1 immediately detects this based on the output from the optical sensor. I can't.
  • the present disclosure provides a light source device capable of accurately and accurately detecting a state of a deflector that scans light with respect to a wavelength conversion member, and a light projecting device using the light source device. Objective.
  • the first aspect of the present disclosure relates to a light source device.
  • the light source device includes a laser light source, a wavelength conversion member, an optical deflector, and a position detector.
  • the laser light source emits laser light.
  • the wavelength conversion member has an incident surface on the optical path of the laser light, converts the wavelength of the laser light to another wavelength, generates converted light, and diffuses the converted light.
  • the optical deflector scans the laser beam at least one dimension on the incident surface of the wavelength conversion member.
  • the position detector receives the laser beam specularly reflected on the incident surface of the wavelength conversion member with respect to all scanning ranges on the incident surface and outputs a detection signal corresponding to the light receiving position of the laser beam.
  • regular reflection means that excitation light is reflected at the same angle as the incident angle without being absorbed and diffused by the phosphor. Regular reflection is also called direct reflection.
  • the detection signal is output from the position detector for the entire scanning range on the incident surface of the wavelength conversion member. Therefore, by monitoring this detection signal, the operation state of the optical deflector can be detected in the entire scanning range. Therefore, the operation state of the optical deflector can be detected accurately and with high accuracy.
  • the second aspect of the present invention relates to a light projecting device.
  • the light projecting device according to the second aspect 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 in the first aspect can be achieved.
  • the light source device and the light projecting device According to the light source device and the light projecting device according to the present disclosure, it is possible to accurately and accurately detect the state of the deflector that scans the wavelength conversion member with light.
  • FIG. 1 is a perspective view illustrating a configuration of a light projecting device according to the first embodiment.
  • FIG. 2 is a cross-sectional view illustrating a configuration of the light projecting device according to the first embodiment.
  • FIG. 3A is a perspective view showing the configuration of the optical deflector according to the first embodiment.
  • FIG. 3B is a perspective view in which a part of the optical deflector according to the first embodiment is cut away.
  • FIG. 4A is a side view schematically showing the configuration of the wavelength conversion member according to the first embodiment.
  • FIG. 4B is a plan view schematically showing the configuration of the wavelength conversion member according to the first embodiment.
  • FIG. 5A is a diagram for explaining a configuration of a position detector and a method for generating a position detection signal according to the first embodiment.
  • FIG. 5B is a cross-sectional view schematically showing the configuration of the position detector according to the first embodiment.
  • FIG. 6A is a diagram schematically illustrating the movement of the beam spot on the incident surface of the wavelength conversion member according to the first embodiment.
  • FIG. 6B is a diagram schematically showing the movement of the specularly reflected light spot on the position detector when the beam spot moves as shown in FIG. 6A according to the first embodiment.
  • FIG. 7 is a circuit block diagram illustrating a main circuit configuration of the light source device according to the first embodiment.
  • FIG. 8A is a diagram schematically illustrating the movement of the beam spot on the incident surface of the wavelength conversion member when the mirror swing angle is lower than a predetermined swing angle according to the first embodiment.
  • FIG. 8B is a diagram schematically showing the movement of the specularly reflected light spot on the light receiving surface of the position detector when the beam spot is moved as shown in FIG. 8A according to the first embodiment.
  • FIG. 9 is a timing chart for explaining an interpolation method of the position detection signal when the laser light source is controlled to be extinguished during a predetermined period according to the first embodiment.
  • FIG. 10A is a flowchart illustrating threshold value setting processing for detecting an abnormality of the wavelength conversion member according to the first embodiment.
  • FIG. 10B is a flowchart illustrating a process for detecting an abnormality of the wavelength conversion member according to the first embodiment.
  • FIG. 11A is a partial cross-sectional view illustrating a configuration of a light projecting device according to a first modification of the first embodiment.
  • FIG. 11B is a partial cross-sectional view illustrating a configuration of a light projecting device according to a second modification of the first embodiment.
  • FIG. 12A is a partial cross-sectional view illustrating a configuration of a light projecting device according to a third modification of the first embodiment.
  • FIG. 12B is a partial cross-sectional view illustrating a configuration of a light projecting device according to a third modification of the first embodiment.
  • FIG. 11A is a partial cross-sectional view illustrating a configuration of a light projecting device according to a first modification of the first embodiment.
  • FIG. 12B is a partial cross-sectional view illustrating a configuration of a light projecting device according to a third
  • FIG. 13 is a perspective view showing a configuration of an optical deflector according to the second embodiment.
  • FIG. 14A is a perspective view in which a part of the optical deflector according to the second embodiment is cut away.
  • FIG. 14B is a perspective view in which a part of the optical deflector according to the second embodiment is cut away.
  • FIG. 15A is a diagram schematically illustrating the movement of the beam spot on the incident surface of the wavelength conversion member according to the second embodiment.
  • FIG. 15B is a diagram schematically illustrating the movement of the specularly reflected light spot on the position detector when the beam spot moves as illustrated in FIG. 6A according to the second embodiment.
  • FIG. 16 is a cross-sectional view illustrating a configuration of a light projecting device according to the third embodiment.
  • the X, Y, and Z axes orthogonal to each other are appended to each drawing.
  • the X-axis direction and the Y-axis direction are the width direction and the depth direction of the light projecting device, respectively, and the Z-axis direction is the height direction of the light projecting device.
  • the positive Z-axis direction is the light projection direction in the light projecting device.
  • FIG. 1 is a perspective view showing a configuration of a light projecting device 1 according to the first embodiment.
  • FIG. 2 is a cross-sectional view illustrating a configuration of the light projecting device 1 according to the first embodiment.
  • FIG. 2 shows a cross-sectional view of the light projecting device 1 cut at a central position in the X-axis direction along a plane parallel to the YZ plane.
  • the light projecting device 1 includes a light source device 2 that generates light and a projection optical system 3 that projects the light generated by the light source device 2.
  • the projection optical system 3 includes two lenses 3a and 3b. The light from the light source device 2 is condensed by these lenses 3a and 3b and projected onto the target area. Note that the projection optical system 3 does not necessarily have only two lenses 3a and 3b, and may include other lenses and mirrors, for example. Further, the projection optical system 3 may be configured to condense light from the light source device 2 using a concave mirror.
  • the light source device 2 has a configuration in which various members are installed on the base 11. Specifically, a laser light source 12, a collimator lens 13, an optical deflector 14, and a wavelength conversion member 15 are installed on the base 11 as a configuration for generating projection light.
  • the collimator lens 13 is installed on the base 11 via the holder 16.
  • the laser light source 12 emits laser light in a blue wavelength band (for example, 450 nm) in the positive direction of the Z axis.
  • the laser light source 12 is made of, for example, a semiconductor laser.
  • the wavelength of the laser light emitted from the laser light source 12 can be changed as appropriate.
  • the laser light source 12 does not necessarily emit a laser beam having a single wavelength band, and may be, for example, a multi-emitting semiconductor laser in which a plurality of light emitting elements are mounted on one substrate.
  • the collimator lens 13 converts the laser light emitted from the laser light source 12 into parallel light.
  • the position of the collimator lens 13 in the optical axis direction may be adjusted so that the laser light emitted from the laser light source 12 becomes convergent light.
  • the optical deflector 14 includes a mirror 17 and changes the traveling direction of the laser light that has passed through the collimator lens 13 by rotating the mirror 17 about the rotation axis L1.
  • the incident surface of the mirror 17 is a plane.
  • the mirror 17 is, for example, a high reflectance mirror in which a dielectric multilayer film is formed on a glass plate. In the neutral position, the mirror 17 is disposed so as to be inclined by a predetermined angle in a direction parallel to the YZ plane with respect to a plane parallel to the XZ plane.
  • the rotation axis L1 of the mirror 17 is parallel to the YZ plane and tilted by a predetermined angle with respect to the Z-axis direction.
  • the configuration of the optical deflector 14 will be described later with reference to FIGS. 3A and 3B.
  • the wavelength conversion member 15 is disposed at a position where the laser beam reflected by the mirror 17 is incident.
  • the wavelength conversion member 15 is a rectangular plate-like member, and is installed on the base 11 so that the incident surface is parallel to the XY plane and the longitudinal direction is parallel to the X axis. As described above, when the mirror 17 rotates about the rotation axis L1, the wavelength conversion member 15 is scanned in the longitudinal direction by the laser light.
  • the wavelength conversion member 15 converts part of the incident laser light into a wavelength different from the blue wavelength band and diffuses it in the Z-axis direction.
  • the other laser light that has not been wavelength-converted is diffused in the Z-axis direction by the wavelength conversion member 15.
  • the light of the two types of wavelengths diffused in this way is combined to generate light of a predetermined color. Light of each wavelength is taken into the projection optical system 3 and projected onto the target area.
  • the wavelength conversion member 15 converts part of the laser light into light in the yellow wavelength band.
  • the diffused light in the yellow wavelength band after wavelength conversion and the scattered light in the blue wavelength band that has not been wavelength-converted are combined to generate white light.
  • the wavelength after wavelength conversion may not be a yellow wavelength range, and the color of the light produced
  • the configuration of the wavelength conversion member 15 will be described later with reference to FIGS. 4A and 4B.
  • a circuit board 18 is installed on the lower surface of the base 11.
  • a circuit for controlling the laser light source 12 and the optical deflector 14 is mounted on the circuit board 18. As shown in FIG. 1, the terminal portion of the circuit board 18 is exposed to the outside on the Y axis positive side of the base 11.
  • the position detector 19 is installed at a position for receiving laser light specularly reflected by the incident surface of the wavelength conversion member 15 (hereinafter referred to as “regular reflected light”).
  • the position detector 19 is in a plane parallel to the XZ plane so that when the mirror 17 is in the neutral position, the central axis of the specularly reflected light is perpendicular to the incident surface of the position detector 19. It is installed on the base 11 in a state inclined by a predetermined angle in a direction parallel to the YZ plane.
  • the position detector 19 receives regular reflection light for all scanning ranges on the incident surface of the wavelength conversion member 15 and outputs a detection signal corresponding to the light receiving position. That is, the position detector 19 has a light receiving surface that is long in the X-axis direction so as to be able to receive regular reflection light for the entire scanning range on the incident surface of the wavelength conversion member 15.
  • a band pass filter 31 that removes yellow light converted by the wavelength conversion member and transmits blue light that is regular reflection light; It is desirable to have a neutral density filter 32 for reducing regular reflection light.
  • the position detector 19 is made of, for example, PSD (Position Sensitive Detector).
  • the position detector 19 may have a configuration in which a photo detector is arranged on an array, or may be an image pickup device such as a CCD (Charge-Coupled Device).
  • FIG. 3A and 3B are a perspective view showing a configuration of the optical deflector 14 and a perspective view in which a part of the optical deflector 14 is cut away, respectively.
  • FIG. 3B shows a cross section 3b obtained by cutting the optical deflector 14 shown in FIG. 3A along a plane including a straight line IIIB-IIIB passing through the central position in the y-axis direction of the optical deflector 14 along the xz plane. ing.
  • FIGS. 3A and 3B newly show x, y, and z axes in order to explain the configuration of the optical deflector 14.
  • the x axis is in the same direction as the X axis shown in FIGS. 1 and 2.
  • the x, y, and z axes are obtained by rotating the X, Y, and Z axes shown in FIGS. 1 and 2 around the X axis by a predetermined angle.
  • the y axis corresponds to the short direction of the optical deflector 14, and the z axis corresponds to the height direction of the optical deflector 14.
  • the z-axis negative side is defined as the upper side of the optical deflector 14.
  • the optical deflector 14 is configured to drive the mirror 17 using electromagnetic force.
  • a component for electromagnetic driving is installed in the housing 101.
  • the housing 101 has a rectangular parallelepiped shape that is long in the x-axis direction.
  • a rectangular recess 101a is formed on the upper surface of the housing 101 in plan view.
  • the housing 101 has bosses 101b formed on the upper surfaces of the positive and negative edges of the x-axis. The two bosses 101b are disposed at an intermediate position of the housing 101 in the y-axis direction.
  • the housing 101 is made of a metal material having high rigidity.
  • a frame-shaped leaf spring 102 is installed on the upper surface of the housing 101.
  • the leaf spring 102 has a frame portion 102a, a support portion 102b, two beam portions 102c, and two holes 102d.
  • Two beam portions 102c are formed so as to extend in parallel to the y-axis direction from the frame portion 102a at an intermediate position in the x-axis direction, and the frame portion 102a and the support portion 102b are connected by these beam portions 102c.
  • the support portion 102b is rectangular in plan view, and two beam portions 102c are connected to the support portion 102b at an intermediate position in the x-axis direction of the support portion 102b.
  • the x-axis positive side hole 102d is circular in plan view, and the x-axis negative side hole 102d is long in the x-axis direction in plan view.
  • the leaf spring 102 is symmetric in the y-axis direction, and is symmetric in the x-axis direction except for the two holes 102d.
  • the leaf spring 102 is integrally formed of a flexible metal material.
  • the two holes 102d are provided at positions corresponding to the two bosses 101b, respectively. With the boss 101b fitted in the hole 102d, the leaf spring 102 is fixed to the upper surface of the housing 101 by the four screws 103.
  • the mirror 17 is fixed to the upper surface of the support portion 102b with an adhesive or the like.
  • the mirror 17 is substantially square in plan view.
  • the axis connecting the two beam portions 102c is the rotation axis L1 of the mirror 17.
  • the laser light from the laser light source 12 is incident on the center position of the mirror 17. That is, the laser light from the laser light source 12 enters the mirror 17 so that the rotation axis L1 and the central axis of the laser light intersect.
  • the coil 104 is mounted on the lower surface of the support portion 102b.
  • the coil 104 circulates in a shape with rounded rectangular corners in plan view.
  • the coil 104 is installed on the lower surface of the support portion 102b so that the middle position of the long side coincides with the rotation axis L1.
  • the coil 104, the support portion 102b, and the mirror 17 constitute a movable portion of the optical deflector 14.
  • Two sets of magnets 105 and 106 are arranged so that the x-axis positive side and x-axis negative side portions of the coil 104 are sandwiched in the x-axis direction, respectively.
  • Magnet 105 and magnet 106 are installed on yoke 107, and yoke 107 is installed on the bottom surface of recess 101 a of housing 101.
  • the magnets 105 and 106 are permanent magnets having a substantially uniform magnetic flux density on the magnetic pole surface.
  • the direction of the magnetic field generated by the x-axis positive magnets 105 and 106 and the direction of the magnetic field generated by the x-axis negative magnets 105 and 106 are the same.
  • the x-axis positive magnet 105 has the north pole facing the coil 104
  • the x-axis negative magnet 105 has the south pole facing the coil 104.
  • the x-axis positive magnet 106 has the south pole facing the coil 104
  • the x-axis negative magnet 106 has the north pole opposed to the coil 104.
  • FIG. 4A is a side view schematically showing the configuration of the wavelength conversion member 15.
  • the wavelength conversion member 15 has a configuration in which a reflective film 202 and a phosphor layer 203 are laminated on the upper surface of a substrate 201.
  • the substrate 201 is made of, for example, silicon or aluminum nitride ceramic.
  • 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 reflection film 202b has a function of protecting the first reflection film 202a from oxidation and the like as well as reflection.
  • SiO 2 , ZnO, ZrO 2 , Nb 2 O 5 , Al 2 O 3 , TiO 2 are used.
  • SiN, AlN, or other dielectric material The reflective film 202 does not necessarily need to be composed of the first reflective film 202a and the second reflective film 202b, and may be a single layer or a structure in which three or more layers are laminated.
  • the phosphor layer 203 is formed by fixing phosphor particles 203a with a binder 203b.
  • the phosphor particles 203a emit fluorescence in the yellow wavelength band when irradiated with laser light in the blue wavelength band emitted from the laser light source 12.
  • As the phosphor particles 203a for example, (Y n Gd 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. Further, a transparent material mainly containing silsesquioxane such as polymethylsilsesquioxane is used as the binder 203b.
  • the phosphor layer 203 may further contain Al 2 O 3 fine particles having an average particle diameter of 0.1 to 10 ⁇ m and a thermal conductivity of 30 W / (m ⁇ K) as the second particles.
  • grains are mixed by the ratio of 10 vol% or more and 90 vol% or less with respect to the fluorescent substance particle 203a.
  • silsesquioxane (refractive index 1.5) refractive index difference is large
  • Al 2 O 3 is a material of the binder 203b (refractive index 1.8) is used. With this configuration, the light scattering property inside the phosphor layer 203 can be improved, and the thermal conductivity of the phosphor layer 203 can be increased.
  • the phosphor layer 203 is provided with a void 203 c formed near the center of the phosphor layer 203 and a void 203 c formed near the interface between the reflective film 202.
  • the void 203c formed inside the phosphor layer 203 is configured to have a higher density as it is closer to the reflective film 202. With this configuration, it is possible to more efficiently scatter laser light that has entered the inside and extract it from the light source device 2.
  • the void 203c formed near the interface with the reflective film 202 is in contact with the second reflective film 202b, which is a dielectric, it effectively scatters laser light and fluorescence while reducing energy loss due to the metal surface. Can be made.
  • the arrangement of the void 203c as described above is achieved by configuring the wavelength conversion member 15 using a phosphor paste in which phosphor particles 203a made of YAG: Ce and a binder 203b made of polysilsesquioxane are mixed. Can be easily formed. Specifically, the phosphor particles 203a and the second particles are formed on the substrate 201 (reflection film 202) using a phosphor paste in which polysilsesquioxane is mixed with a binder 203b in which an organic solvent is dissolved. Then, the organic solvent in the paste is vaporized by performing high-temperature annealing at about 200 ° C.
  • the void 203c can be easily formed in the portion close to the substrate 201.
  • the high-density void 203c can be easily formed in the vicinity of the reflective film 202.
  • the phosphor layer 203 further includes a filler 203d for increasing strength and heat resistance.
  • the difference in refractive index between the filler 203d and the binder 203b is also set to be large, similar to the difference in refractive index between the phosphor particles 203a and the binder 203b.
  • the laser light emitted from the laser light source 12 is irradiated to the excitation region R1 shown in FIG. 4A, and is scattered and absorbed on the surface or inside of the phosphor layer 203. At this time, part of the laser light is converted into light in the yellow wavelength band by the phosphor particles 203 a and emitted from the phosphor layer 203. Further, the other part of the laser light is scattered without being converted into light in the yellow wavelength band, and is emitted from the phosphor layer 203 as light in the blue wavelength band. At this time, light in each wavelength band is scattered while propagating through the phosphor layer 203, and thus is emitted from the light emitting region R2 wider than the excitation region R1.
  • the phosphor layer 203 is configured such that the refractive index difference between the binder 203b and the phosphor particle 203a and the refractive index difference between the binder 203b and the filler 203d are both large, thereby scattering light. And propagation of light inside the phosphor layer 203 can be suppressed. As a result, light can be emitted from the light emitting region R2 that is slightly wider than the excitation region R1.
  • the void 203c is further arranged in the phosphor layer 203 to enhance light scattering. As a result, the excitation region R1 and the light emission region R2 can be brought closer to each other.
  • FIG. 4B is a plan view schematically showing the configuration of the wavelength conversion member 15.
  • the wavelength conversion member 15 has a rectangular shape that is long in the X-axis direction in plan view.
  • the wavelength conversion member 15 is scanned in the X-axis direction with a laser beam when the mirror 17 of the optical deflector 14 is rotated.
  • B1 indicates the beam spot of the laser beam.
  • the beam spot B1 reciprocates on the incident surface 15a of the wavelength conversion member 15 in the width W1.
  • a triangular wave-shaped drive signal (current) having an amplitude center at zero level is applied to the coil 104. Due to the driving force excited in the coil 104 by this driving signal, the mirror 17 together with the support portion 102b rotates around a neutral position with a predetermined rotation width. Thereby, the laser beam (beam spot B1) reflected by the mirror 17 reciprocates on the incident surface 15a of the wavelength conversion member 15 in the width W1.
  • the “neutral position” is the position of the mirror 17 when the drive signal (current) is not applied to the coil 104.
  • the position of the mirror 17 when the mirror 102b and the mirror 17 are not rotated in any direction about the rotation axis L1 and is in a state parallel to the xy plane.
  • the reciprocation of the beam spot B1 is indicated by a straight arrow.
  • the actual movement locus of the beam spot B1 is X A slightly curved locus in which both ends in the X-axis positive and negative directions are displaced in the Y-axis negative direction with respect to the axial center position.
  • the region of the beam spot B1 on the incident surface 15a corresponds to the excitation region R1 in FIG. 4A. While the beam spot B1 moves on the incident surface 15a of the wavelength conversion member 15, the diffused light in the blue wavelength band and the diffused light in the yellow wavelength band from the light emitting region R2 slightly wider than the region of the beam spot B1 in the positive direction of the Z axis. Radiated.
  • the light in the two wavelength bands thus radiated is taken in by the projection optical system 3 shown in FIGS. 1 and 2 and projected onto the target area. Accordingly, white light obtained by combining light in the blue wavelength band and light in the yellow wavelength band is projected from the light projecting device 1 onto the target area.
  • the active layer of the laser element mounted on the laser light source 12 is parallel to the XZ plane.
  • the beam shape of the laser light incident on the collimator lens 13 is an elliptical shape that is long in the Y-axis direction.
  • the laser beam is irradiated onto the incident surface 15 a of the wavelength conversion member 15 with the beam spot B ⁇ b> 1 that is long in the Y-axis direction.
  • the shape of the beam spot B1 is not limited to an ellipse, and may be another shape that is long in the Y-axis direction.
  • the collimator lens 13 may have an optical action for adjusting the beam shape, or the reflecting surface of the mirror 17 is made a predetermined concave shape so that the beam shape is adjusted on the mirror 17. You may give an optical action.
  • FIG. 5A is a diagram for explaining a configuration of the position detector 19 and a method of generating a position detection signal.
  • FIG. 5B is a cross-sectional view schematically showing the configuration of the position detector 19.
  • the position detector 19 has a structure in which a P-type resistance layer serving as a light-receiving surface and a resistance layer is formed on the surface of an N-type high-resistance silicon substrate. Electrodes X1 and X2 for outputting a lateral photocurrent are formed on the resistance layer on the front surface side, and a common electrode X3 is formed on the resistance layer on the back surface side. The photocurrent flowing into the electrodes X1 and X2 is output from the terminals 19b and 19c.
  • the photocurrent output from the terminals 19b and 19c has a size divided in inverse proportion to the distance from the irradiation position of the regular reflection light to the electrodes X1 and X2. Therefore, it is possible to detect the irradiation position of the regular reflection light in the X-axis direction on the light receiving surface based on the current value of the photocurrent output from the terminals 19b and 19c.
  • the horizontal coordinate Px of the irradiation position with respect to the horizontal center position Lmx of the light receiving surface 19a is the current value of the photocurrent output from the electrodes X1 and X2, respectively Ix1, Ix2, and the horizontal electrode
  • the distance between X1 and X2 is Lx, it is calculated by the following equation.
  • FIG. 6A is a diagram schematically showing the movement of the beam spot B1 on the incident surface 15a of the wavelength conversion member 15.
  • FIG. 6B is a diagram schematically showing the movement of the regular reflection light spot RB1 on the light receiving surface 19a of the position detector 19 when the beam spot B1 moves as shown in FIG. 6A.
  • the specularly reflected light spot RB1 moves on the light receiving surface 19a of the position detector 19 as shown in FIG. 6B.
  • the lateral movement position of the specularly reflected light spot RB1 corresponds to each movement position in the X-axis direction of the beam spot B1 on the incident surface 15a on a one-to-one basis.
  • the specularly reflected light spot RB1 moves in the lateral direction on the light receiving surface 19a of the position detector 19 within the range of the width Lw.
  • the position of the beam spot B1 on the incident surface 15a corresponds to the rotation angle of the mirror 17 in the optical deflector 14. Therefore, the lateral position of the specularly reflected light spot RB1 on the light receiving surface 19a of the position detector 19 with respect to the center position Lmx corresponds to the rotation angle of the optical deflector 14 with respect to the neutral position of the mirror 17. Therefore, not only the scanning position of the beam spot B1 on the incident surface 15a of the wavelength conversion member 15 but also the mirror 17 of the optical deflector 14 is detected by the position detection signal (coordinate Px) calculated based on the above formula (1). The rotation angle can also be detected.
  • the optical deflector 14 is set so that the scanning state of the laser light with respect to the incident surface 15a of the wavelength conversion member 15 becomes a predetermined scanning state. Is controlled.
  • FIG. 7 is a circuit block diagram showing a main circuit configuration of the light source device 2.
  • the light source device 2 includes a controller 301, a laser drive circuit 302, a mirror drive circuit 303, a position detection circuit 304, and an interface 305 as a circuit unit configuration. These circuits are mounted on the circuit board 18 shown in FIGS. A laser light source 12 is further installed on the circuit board 18. The circuit may be configured such that a part or all of each circuit is mounted on a circuit board different from the circuit board 18 and connected to the circuit on the circuit board 18 side with a cable.
  • the controller 301 includes an arithmetic processing circuit such as a CPU (Central Processing Unit) and a memory, and controls each unit according to a predetermined control program.
  • the laser drive circuit 302 drives the laser light source 12 according to a control signal from the controller 301.
  • the mirror drive circuit 303 drives the mirror 17 of the optical deflector 14 in accordance with a control signal from the controller 301.
  • the position detection circuit 304 performs the calculation of the above formula (1) based on the detection signal input from the position detector 19, that is, the current output from the terminals 19b and 19c in FIGS. 5A and 5B.
  • the position detection signal (coordinate Px) obtained by the calculation is output to the controller 301.
  • the interface 305 is an input / output circuit for the controller 301 to transmit / receive signals to / from an external control circuit such as a vehicle-side control circuit.
  • the controller 301 monitors the scanning state of the laser beam with respect to the incident surface 15a of the wavelength conversion member 15 based on the position detection signal (coordinate Px) input from the position detection circuit 304, and determines whether the scanning state of the laser beam is appropriate as needed. Determine. And when the scanning state of the laser beam with respect to the incident surface 15a of the wavelength conversion member 15 deviates from a predetermined scanning state, the optical deflector 14 is controlled so that the scanning state becomes appropriate.
  • FIG. 8A is a diagram schematically showing the movement of the beam spot B1 on the incident surface 15a of the wavelength conversion member 15 when the swing angle of the mirror 17 is lower than a predetermined swing angle.
  • FIG. 8B is a diagram schematically showing the movement of the regular reflection light spot RB1 on the light receiving surface 19a of the position detector 19 when the beam spot B1 moves as shown in FIG. 8A.
  • the rotation width of the mirror 17 according to the drive signal may be reduced from a predetermined rotation width due to, for example, deterioration of the optical deflector 14 over time.
  • the movement width of the beam spot B1 on the incident surface 15a of the wavelength conversion member 15 is reduced by ⁇ W with respect to the predetermined width W1.
  • the movement width of the regular reflection light spot RB1 on the light receiving surface 19a of the position detector 19 also decreases by ⁇ L from the predetermined width Lw.
  • the controller 301 sends the drive signal amplitude to the mirror drive circuit 303, that is, so that the movement width of the regular reflection light spot RB1 on the light receiving surface 19a of the position detector 19 becomes the predetermined width Lw. Control is performed to increase the amplitude of the drive signal having a triangular waveform centered on the zero level. By this control, the movement width of the beam spot B1 on the incident surface 15a of the wavelength conversion member 15 is matched with the predetermined width W1.
  • the controller 301 measures the time required for the specularly reflected light spot RB1 to move between the boundaries on both sides of the width Lw, and based on the measurement result, the frequency of the reciprocating movement of the specularly reflected light spot RB1. (Period) is acquired. Then, the controller 301 determines that resonance occurs in the operation of the mirror 17 when the acquired frequency (cycle) greatly deviates from the frequency (cycle) of the drive signal of the optical deflector 14. Based on this determination result, the controller 301 changes the frequency of the drive signal so that the frequency (cycle) of the reciprocating movement of the regular reflection light spot RB1 matches the frequency of the drive signal.
  • the control based on the position detection signal in the controller 301 is not limited to the above control.
  • the controller 301 determines whether or not the movement width of the regular reflection light spot RB1 is shifted laterally from a predetermined width Lw based on the position detection signal, and the movement width of the regular reflection light spot RB1 is a predetermined width. You may perform control which adjusts the drive signal of the optical deflector 14 so that it may match with Lw. Alternatively, when the right-side movement width and the left-side movement width of the regular reflection light spot RB1 are different from the center position Lm, the drive signal of the optical deflector 14 is adjusted so that these movement widths are equal to each other. Control may be performed.
  • the laser light source 12 in a predetermined section in the width W1.
  • Control to turn off can be performed. For example, when a vehicle or oncoming vehicle is detected within the range of the headlamp on the vehicle side, control to turn off the position of the preceding vehicle or oncoming vehicle, light is applied only to the human area, etc.
  • the light source device 2 is instructed from the vehicle side to control the so-called spot illumination, in which the region is not irradiated. This instruction is input to the controller 301 via the interface 305 in FIG. In this case, the controller 301 controls the laser drive circuit 302 to turn off the laser light source 12 in a predetermined section in the width W1 in accordance with an instruction from the vehicle side.
  • the process of interpolating the position detection signal during the non-lighting period of the laser light source 12 based on the position detection signal acquired during the lighting period of the laser light source 12 includes: This is performed in the controller 301.
  • FIG. 9 is a timing chart for explaining the interpolation method of the position detection signal when the laser light source 12 is controlled to be extinguished during a predetermined period.
  • Drive signals output from the mirror drive circuit 303 and the laser drive circuit 302 are shown in the uppermost stage and the middle stage of FIG. 9, respectively, and a position detection signal output from the position detection circuit 304 is shown in the lowermost stage of FIG. It is shown.
  • the optical deflector 14 is supplied with a triangular wave drive signal centered on the zero level as the amplitude.
  • the position detection signal is output from the position detection circuit 304 only during the period (T1-T2, T4-T5, T7-T8, T10-T11) when the laser light source 12 is turned on.
  • the controller 301 interpolates similarly the drive signal in the non-lighting period as indicated by the dotted line in the lowermost stage, based on the slope and value of the output drive signal.
  • the controller 301 obtains a straight line that overlaps the drive signal between the timings T1 and T2 based on the value of the drive signal at the timings T1 and T2 and the slope of the drive signal between the timings T1 and T2. Similarly, the controller 301 obtains a straight line that overlaps the drive signal between timings T4 and T5, a straight line that overlaps the drive signal between timings T7 and T8, and a straight line that overlaps the drive signal between timings T10 and T11. Then, the controller 301 obtains the intersection of these straight lines, and interpolates the position detection signal during the non-lighting period of the laser light source 12 with the line segments up to the intersections of the respective straight lines. The controller 301 executes the above-described control process based on the position detection signal after interpolation thus obtained.
  • the controller 301 executes a process of determining the state of the wavelength conversion member 15 based on a signal output from the position detector 19 in addition to the various processes described above.
  • the thickness of the phosphor layer 203 may gradually decrease from the initial thickness due to factors such as continued irradiation with high-power laser light.
  • the thickness of the phosphor layer 203 is thus reduced, the excited fluorescence is reduced, and light of a desired color is not output.
  • the phosphor layer 203 disappears completely in a part of the region, almost all of the light irradiated to the region is reflected laterally by the reflective film 202 and is not taken into the projection optical system 3.
  • the thickness of the phosphor layer 203 decreases or the phosphor layer 203 disappears in a part of the region, the color of light generated in the part changes from a desired color, or the The light irradiated to the part is not taken into the projection optical system 3.
  • the state of the phosphor layer 203 in the wavelength conversion member 15 can be determined by monitoring the amount of specularly reflected light incident on the position detector 19.
  • a light amount signal corresponding to the amount of specularly reflected light incident on the light receiving surface 19a of the position detector 19 is acquired from the signal output from the position detector 19, and the acquired light amount signal is obtained. Based on this, the state of the wavelength conversion member 15 is determined.
  • the light quantity signal is acquired as a signal obtained by adding the current values Ix1 and Ix2 of the photocurrent output from the terminals 19b and 19c shown in FIGS. 5A and 5B. Therefore, the position detection circuit 304 shown in FIG. 7 further executes a calculation process for calculating the light amount signal by adding the current values Ix1 and Ix2 of the photocurrent, and the light amount signal acquired by the calculation process is converted to the controller as needed. A configuration for outputting to 301 is also provided.
  • the controller 301 determines whether or not there is an abnormality in the wavelength conversion member 15 based on the light quantity signal thus acquired. Specifically, the controller 301 determines that an abnormality has occurred in the phosphor layer 203 of the wavelength conversion member 15 when the light amount signal exceeds a predetermined threshold value.
  • the controller 301 executes processing for updating the threshold value to be compared with the light amount signal based on the total lighting time of the laser light source 12.
  • FIG. 10A is a flowchart showing a threshold value Dth setting process for detecting an abnormality of the wavelength conversion member 15.
  • the controller 301 starts measuring the total activation time T of the laser light source 12 (S11).
  • the total activation time T is the total activation time of the laser light source 12 after the laser light source 12 is first activated.
  • the total activation time T is measured only during a period in which the laser light source 12 is in a lighting state after the light source device 2 is activated, and is not measured in a period in which the laser light source 12 is in a non-lighting state.
  • the controller 301 determines whether or not the total activation time T has reached a preset update time Tc (S12). When the total activation time T reaches the update time Tc (S12: YES), the controller 301 updates the threshold value Dth (S13). When the total activation time T has not reached the update time Tc (S12: NO), the controller 301 skips step S13.
  • the controller 301 repeatedly executes the processes of steps S11 to S13 until the light source device 2 is powered off (S14: YES). When the power supply to the light source device 2 is shut off (S14: YES), the controller 301 ends the measurement of the total activation time T and stores the total activation time T after measurement in the internal memory (S15).
  • a plurality of update times Tc in step S12 are held in the controller 301 in advance. For example, when four update times Tc are held, the controller 301 first decreases the threshold Dth at the timing when the total activation time T reaches the first update time Tc, and then the total activation time T is The threshold value Dth is further lowered at the timing when the next update time Tc is reached. Thereafter, similarly, the controller 301 decreases the threshold value Dth every time the total activation time T reaches the third and fourth update times Tc.
  • the threshold value Dth of each update time Tc is set in consideration of, for example, a change in emission power over time, which can occur normally in the laser light source 12. That is, the output power at each update time Tc is set based on a standard change over time, and a predetermined ratio (for example, 1.8) Is set to the value of the light amount signal that can be generated when the laser light is emitted with the set output power. A value obtained by multiplying 5) is set as the threshold value Dth at the update time Tc. The threshold value Dth at each update time Tc is held in the internal memory of the controller 301 in advance.
  • FIG. 10B is a flowchart showing a process for detecting an abnormality of the wavelength conversion member 15 using the threshold value Dth set by the process of FIG. 10A.
  • the controller 301 determines whether or not the acquired light amount signal Da exceeds the threshold value Dth (S22).
  • the controller 301 ends the lighting of the laser light source 12, and sets a flag indicating that an abnormality has occurred in the wavelength conversion member 15 (S23).
  • the controller 301 may output a notification signal indicating that an abnormality has occurred in the wavelength conversion member 15 to an external control circuit (for example, a control circuit on the vehicle side) via the interface 305.
  • the controller 301 skips step S23.
  • the controller 301 repeatedly executes the processes of steps S21 to S23 until the power to the light source device 2 is shut off (S24: YES).
  • the controller 301 ends the abnormality detection process of the wavelength conversion member 15.
  • a detection signal is output from the position detector 19 for the entire scanning range (width W1) on the incident surface 15a of the wavelength conversion member 15. Therefore, by monitoring this detection signal, the operation state of the optical deflector 14 can be detected in the entire scanning range (width W1). Therefore, the operating state of the optical deflector 14 can be detected accurately and with high accuracy.
  • the band pass filter 31 it becomes possible to detect signals more accurately by removing unnecessary yellow light as signal light, and by having the neutral density filter 32, the signal light is not saturated. It is possible to adjust the signal amount.
  • the controller 301 changes the scanning state of the laser light on the incident surface 15 a of the wavelength conversion member 15 to a predetermined scanning state based on the detection signal from the position detector 19.
  • the optical deflector 14 is controlled. Thereby, even when the operation of the optical deflector 14 is deteriorated due to aging deterioration or the like, the scanning state of the laser light with respect to the incident surface 15a of the wavelength conversion member 15 can be adjusted to a predetermined scanning state. It can also be used as a synchronizing signal between the laser light source 12 and the optical deflector 14 for determining the lighting position for illumination.
  • the controller 301 disappears based on the detection signal of the lighting period.
  • the detection signal for the period is interpolated, and the optical deflector 14 is controlled based on the detection signal after the interpolation.
  • the controller 301 outputs a light amount signal Da corresponding to the amount of laser light (regular reflection light) regularly reflected on the incident surface 15 a of the wavelength conversion member 15 from the position detector 19. Is obtained based on the obtained signal, and the state of the wavelength conversion member 15 is determined based on the obtained light quantity signal Da. Thereby, the abnormality of the wavelength conversion member 15 can be further detected based on the detection signal from the position detector 19 and the controller 301 can appropriately take measures such as stopping the lighting of the laser light source 12.
  • the configuration for detecting the specularly reflected light can be variously changed in addition to the configuration shown in the first embodiment.
  • the position detector 19 is installed on the circuit board 18, and the specularly reflected light that is specularly reflected by the incident surface 15 a of the wavelength conversion member 15 is mirror 20 (light guide member). ) May be guided to the position detector 19.
  • the base 11 is provided with a hole 11 a for guiding the specularly reflected light reflected by the mirror 20 to the position detector 19.
  • the condensing lens 21 is further attached to the base 11 as a condensing member for condensing the specularly reflected light on the light receiving surface 19a of the position detector 19. It may be installed.
  • the size of the specularly reflected light spot RB1 can be further reduced.
  • the position detection accuracy of the regular reflection light spot RB1 on the light receiving surface 19a can be increased. For this reason, the scanning position of the beam spot B1 on the incident surface 15a of the wavelength conversion member 15 and the rotational position of the mirror 17 can be detected with higher accuracy.
  • the specularly reflected light may be condensed on the light receiving surface 19 a of the position detector 19 by a concave mirror 22 instead of the condenser lens 21.
  • the concave mirror 22 functions as a light guide member that guides the specularly reflected light to the position detector 19 and a light collecting member that condenses the specularly reflected light on the light receiving surface 19 a of the position detector 19.
  • the condensing lens 21 can be omitted from the configuration of FIG. 11B, so that the configuration can be simplified.
  • the specularly reflected light that is specularly reflected by the incident surface 15 a of the wavelength conversion member 15 is collected on the light receiving surface 19 a of the position detector 19.
  • the condensing lens 23 may be installed on the base 11. Also in this case, since the position detection accuracy of the regular reflection light spot RB1 on the light receiving surface 19a can be increased, the scanning position of the beam spot B1 on the incident surface 15a of the wavelength conversion member 15 and the rotation position of the mirror 17 are further increased. It can be detected with high accuracy.
  • the optical deflector 14 is configured to rotate the driven part about one axis.
  • the optical deflector 14 is configured so that the mirror 17 can rotate about two rotation axes orthogonal to each other.
  • the scanning locus of the laser beam on the incident surface 15a of the wavelength conversion member 15 is different from that in the first embodiment.
  • a plurality of scanning lines are set on the incident surface 15a of the wavelength conversion member 15, and accordingly, the size of the beam spot that scans the incident surface 15a of the wavelength conversion member 15 is It is narrowed down compared to the first embodiment.
  • Other configurations of the light projecting device 1 and the light source device 2 are the same as those in the first embodiment.
  • the size of the beam spot can be further reduced by adjusting the distance between the laser light source 12 and the collimator lens 13, the numerical aperture of the collimator lens 13, and the like. Further, the collimator lens 13 or the mirror 17 may be further provided with an optical action for adjusting the size and shape of the beam spot.
  • FIG. 13 is a perspective view showing the configuration of the optical deflector 14 according to the second embodiment.
  • 14A and 14B are perspective views in which a part of the optical deflector 14 according to the second embodiment is cut away.
  • 13, 14 ⁇ / b> A, and 14 ⁇ / b> B show the same x, y, and z axes as in FIGS. 3A and 3B.
  • FIG. 14A shows a cross section 14a obtained by cutting the optical deflector 14 shown in FIG. 13 along a plane including a straight line XIVA-XIVA passing through the central position in the y-axis direction of the optical deflector 14 along the xz plane.
  • the optical deflector 14 shown in FIG. 13 in a plane parallel to the yz plane is parallel to the yz plane and includes a straight line XIVB-XIVB passing through the central position in the x-axis direction.
  • a cut section 14b is shown.
  • the housing 111 has a rectangular parallelepiped shape that is long in the x-axis direction. On the upper surface of the housing 111, a rectangular recess 111a is formed in plan view.
  • the housing 111 is made of a metal material having high rigidity.
  • a frame-shaped leaf spring 112 is installed on the upper surface of the housing 111.
  • the leaf spring 112 has an outer frame portion 112a, an inner frame portion 112b, two beam portions 112c, a support portion 112d, and two beam portions 112e.
  • Two beam portions 112c are formed so as to extend in parallel to the x-axis direction from the outer frame portion 112a at an intermediate position in the y-axis direction, and the outer frame portion 112a and the inner frame portion 112b are connected by these beam portions 112c.
  • two beam portions 112e are formed so as to extend in parallel to the y-axis direction from the inner frame portion 112b, and the inner frame portion 112b and the support portion 112d are formed by these beam portions 112e. It is connected.
  • the inner frame portion 112b has a contour with rounded rectangular corners in plan view, and two beam portions 112c are connected to the inner frame portion 112b at an intermediate position in the y-axis direction of the inner frame portion 112b.
  • the support portion 112d has a rectangular outline in plan view, and two beam portions 112e are connected to the support portion 112d at an intermediate position in the x-axis direction of the support portion 112d.
  • the leaf spring 112 has a symmetrical shape in the x-axis direction and the y-axis direction.
  • the leaf spring 112 is integrally formed of a flexible metal material.
  • the plate spring 112 is fixed to the upper surface of the housing 111 with four screws 113 in a state where the outer frame portion 112 a is placed on the upper surface of the housing 111.
  • the mirror 17 is fixed to the upper surface of the support portion 112d with an adhesive or the like.
  • the mirror 17 is substantially square in plan view.
  • the axis connecting the two beam portions 112e becomes the rotation axis L1 of the mirror 17 for scanning the laser beam in the longitudinal direction of the wavelength conversion member 15 as in the first embodiment.
  • the axis connecting the two beam portions 112c becomes the rotation axis L2 of the mirror 17 for changing the scanning line of the laser beam in the wavelength conversion member 15.
  • the laser light from the laser light source 12 enters the center position of the mirror 17. That is, the laser light from the laser light source 12 is incident on the mirror 17 so that the central axis of the laser light passes through the position where the rotation axes L1 and L2 intersect.
  • the coil 114 is attached to the lower surface of the support portion 112d.
  • the coil 114 circulates in a shape with rounded rectangular corners in plan view.
  • the coil 114 is installed on the lower surface of the support portion 112d so that the middle position of the long side coincides with the rotation axis L1.
  • the coil 114, the support part 112 d, and the mirror 17 constitute a first movable part of the optical deflector 14.
  • Two sets of magnets 115 and 116 are arranged so as to sandwich the coil 114 in the x-axis direction.
  • the magnets 115 and 116 are installed on the yoke 117, and the yoke 117 is installed on the bottom surface of the recess 111 a of the housing 111.
  • the method of adjusting the magnetic poles of each set of magnets 115 and 116 is the same as that of the magnets 105 and 106 shown in FIGS. 3A and 3B.
  • a coil 118 is attached to the lower surface of the inner frame portion 112b.
  • the coil 118 has the same shape as the inner frame portion 112b in plan view.
  • the coil 118 is installed on the lower surface of the inner frame portion 112b so that the intermediate position of the short side coincides with the rotation axis L2.
  • the coil 118 and the inner frame portion 112b constitute a second movable portion of the optical deflector 14.
  • Magnets 119 are arranged on the y-axis positive side and the y-axis negative side with respect to the coil 114, respectively. These magnets 119 are installed on the yoke 117. Further, these two magnets 119 are installed on the yoke 117 so that the magnetic poles facing the coil 118 are different from each other.
  • the magnet 119 is a permanent magnet having a substantially uniform magnetic flux density on the magnetic pole surface.
  • the inner frame portion 112b rotates about the rotation axis L2, and according to the magnitude of the drive signal.
  • the inner frame portion 112b is inclined by the angle. That is, the inner frame portion 112b is inclined from the neutral position shown in FIG. 13 by an angle at which the elastic restoring force generated in the beam portion 112c and the electromagnetic force excited by the coil 118 are balanced.
  • the mirror 17 rotates together with the support portion 112d as the inner frame portion 112b rotates.
  • the support portion 112d rotates about the rotation axis L1 by applying a drive signal (current) to the coil 114 as in the configuration of FIGS. 3A and 3B.
  • a drive signal current
  • the mirror 17 rotates about the rotation axis L1.
  • the drive signal current is independently applied to the coils 114 and 118, whereby the mirror 17 is individually moved about the rotation axes L 1 and L 2. Can be rotated.
  • FIG. 15A is a diagram schematically showing a scanning state of the laser light in the wavelength conversion member 15.
  • a plurality of scanning lines SL1 are set on the incident surface 15a of the wavelength conversion member 15.
  • three scanning lines SL1 are set on the incident surface 15a.
  • the number of scanning lines SL1 is not limited to this.
  • the beam spot B2 is narrowed down more than in the case of the first embodiment, and the shape of the beam spot B2 is adjusted to be circular.
  • Such adjustment of the size and shape of the beam spot B2 is realized, for example, by giving the collimator lens 13 an optical action for converging the laser beam in a circular shape on the incident surface 15a of the wavelength conversion member 15.
  • such an optical action may be imparted to the reflecting surface of the mirror 17.
  • the reflecting surface of the mirror 17 is adjusted to a concave shape that can impart such an optical action to the laser light.
  • the laser beam spot B2 is positioned at the start position on the X-axis positive side of the second-stage scan line SL1 after the uppermost scan line SL1 is moved to the end position in the X-axis positive direction. Thereafter, the beam spot B2 is positioned at the X axis negative start position of the third scanning line SL1 after the second scanning line SL1 is moved to the end position in the X axis negative direction. Similarly, when the beam spot B2 moves to the end position on the X axis positive side of the third-stage scanning line SL1, the beam spot B2 is positioned at the start position of the second-stage scanning line SL1.
  • the beam spot B2 is positioned at the start position on the X-axis negative side of the first-stage scan line SL1 after the second-stage scan line SL1 is moved to the end position in the X-axis negative direction. Thereafter, the same scanning is repeated for the three scanning lines SL1.
  • the movement of the beam spot B2 along the scanning line SL1 is performed by rotating the mirror 17 about the rotation axis L1 shown in FIG.
  • the scan line SL1 is changed by rotating and tilting the mirror 17 about the rotation axis L2 shown in FIG.
  • the optical deflector 14 is controlled by the control circuit mounted on the circuit board 18 of FIG. 1 so that the beam spot B2 scans the incident surface 15a of the wavelength conversion member 15 as described above.
  • the feed lines TL1 and TL2 in FIG. 15A indicate the movement trajectory of the beam spot B2 when laser light is emitted, and in actual control, the laser light source 12 in the feed lines TL1 and TL2 is shown. Is controlled to be turned off.
  • the laser beam scanning method for the incident surface 15a of the wavelength conversion member 15 is not limited to the above.
  • the incident surface 15a of the wavelength conversion member 15 is scanned with a laser beam so that the beam spot B2 jumps back and forth along each scanning line SL1 and then jumps to the start position of the next scanning line SL1. May be.
  • the position detector 19 is replaced with a two-dimensional detection position detector 19 ′ shown in FIG. 15B so that the scanning position of the beam spot B2 in each scanning line SL1 can be detected. It is done.
  • the position detector 19 ′ is a pair for outputting a photocurrent in the vertical direction to the resistance layer on the surface side shown in FIG. 5B. The electrodes are formed at the vertical edges, and the photocurrents flowing into these electrodes are output from the terminals 19d and 19e, respectively.
  • the vertical coordinate Py of the irradiation position with the vertical center position Lmy of the light receiving surface 19a as a reference is calculated by the following equation.
  • Iy1 and Iy2 are current values of photocurrents output from the terminals 19d and 19e
  • Ly is a distance between the electrodes in the vertical direction.
  • the specularly reflected light spot RB2 on the light receiving surface 19a is obtained by performing the calculation of the equation (2) based on the current values Iy1 and Iy2 of the photocurrent output from the terminals 19d and 19e of the position detector 19 ′.
  • a position detection signal (coordinate Py) indicating the position in the vertical direction can be calculated.
  • the position detection signal (coordinate Px) indicating the lateral position of the regular reflection light spot RB2 on the light receiving surface 19a can be calculated based on the above equation (1).
  • the specularly reflected light spot RB2 moves along the light receiving surface 19a of the position detector 19 ′ as shown in FIG. 15B. Move to.
  • the position of the beam spot B1 on the incident surface 15a and the position of the specularly reflected light spot RB1 on the light receiving surface 19a correspond one-to-one. Therefore, also in this case, the position of the beam spot B1 on the incident surface 15a and the rotation position of the mirror 17 can be detected by the two types of position detection signals calculated by the above formulas (1) and (2).
  • the position detection circuit 304 acquires two types of position detection signals indicating the positions of the regular reflection light spot RB2 in the horizontal direction and the vertical direction based on the above formulas (1) and (2). These position detection signals are output to the controller 301 as needed. Further, the position detection circuit 304 adds the current values Ix1, Ix2, Iy1, and Iy2 of the photocurrents output from the terminals 19b to 19e to acquire a light amount signal, and outputs the acquired light amount signal to the controller 301.
  • the controller 301 determines the scanning state of the beam spot B2 for each scanning line SL1 based on the two types of position detection signals calculated by the above formulas (1) and (2), and the beam spot B2 performs predetermined scanning.
  • the optical deflector 14 is controlled so as to appropriately scan the incident surface 15a of the wavelength conversion member 15 according to the line SL1. Further, the controller 301 performs wavelength conversion based on the light amount signal obtained by adding the current values Ix1, Ix2, Iy1, and Iy2 of the photocurrents output from the terminals 19b to 19e, as in the first embodiment.
  • a process for detecting an abnormality of the member 15 is executed.
  • the operation state of the optical deflector 14 can be detected in the entire scanning range (width W1, scanning line SL1) by monitoring the detection signal. Therefore, the operating state of the optical deflector 14 can be detected accurately and with high accuracy.
  • the wavelength conversion member 15 is scanned along the plurality of scanning lines SL1 with the more narrow beam spot B2, for example, white light is emitted on the light emitting region R2.
  • the region where the light emission is stopped and the region where the white light is emitted can be set more finely. For this reason, when the white light generated from the light source device 2 is projected onto the target area by the projection optical system 3, the area where the white light projection is stopped or the area where the white light projection is performed on the target area is more Can be set in detail.
  • the white light irradiation region and the non-irradiation region are set more finely according to the position of the oncoming vehicle and the position of the pedestrian. be able to.
  • the reflective wavelength conversion member 15 is used.
  • a transmissive wavelength conversion member 15 is used.
  • the substrate 201 shown in FIG. 4A is formed of a material having excellent light transmittance, and the reflective film 202 transmits laser light in the blue wavelength band and reflects fluorescence in the yellow wavelength band. Changed to dichroic membrane. Laser light is incident from the lower surface of the substrate 201 opposite to the phosphor layer 203.
  • FIG. 16 is a cross-sectional view showing the configuration of the light projecting device 1 according to the third embodiment.
  • the wavelength conversion member 15 is installed on the base 11 so as to face the mirror 17 from the Y axis negative side. Further, the tilt angle of the mirror 17 is adjusted so that the wavelength conversion member 15 can be irradiated with laser light.
  • a position detector 19 is installed at a position where the regular reflection light regularly reflected by the wavelength conversion member 15 is incident. Similar to the first embodiment, the position detector 19 is arranged so that the specularly reflected light can be received in the entire scanning range on the incident surface 15 a of the wavelength conversion member 15.
  • the wavelength conversion member 15 is scanned with laser light as the mirror 17 rotates.
  • diffused light in the yellow wavelength band and diffused light in the blue wavelength band are emitted from the Y axis negative side of the wavelength conversion member 15, and these diffused lights are taken into the lenses 3 a and 3 b of the projection optical system 3.
  • white light is emitted from the projection optical system 3.
  • the controller 301 monitors the scanning state of the laser beam with respect to the incident surface 15a of the wavelength conversion member 15 as in the first embodiment.
  • the controller 301 controls the optical deflector 14 so that the scanning state of the laser light with respect to the incident surface 15a of the wavelength conversion member 15 becomes a predetermined scanning state.
  • the same effect as in the first embodiment can be obtained. Also in the third embodiment, the configuration of the second embodiment or the configuration of each modification shown in FIGS. 11A to 12B can be applied as appropriate.
  • the shape of the leaf springs 102 and 112 is not necessarily limited to the shape shown in the first embodiment and the second embodiment.
  • the region of the frame portion 102a other than the region sandwiched between the screws 103 may be omitted.
  • the shape of the mirror 17 does not necessarily have to be a square in a plan view, and may be a rectangle or a circle in a plan view.
  • the shape of the support portion 102b can also be changed as appropriate.
  • the type of the phosphor particles 203a included in the phosphor layer 203 of the wavelength conversion member 15 is not necessarily one type.
  • a plurality of types that generate fluorescence with different wavelengths by the laser light from the laser light source 12 are used.
  • Phosphor particles 203 a may be included in the phosphor layer 203.
  • light of a predetermined color is generated by the diffused light of the fluorescence generated from each type of phosphor particles 203a and the diffused light of the laser light that has not been wavelength-converted by the phosphor particles 203a.
  • the light source device and the light projecting device of the present disclosure can accurately and accurately detect the state of a deflector that scans light with respect to a wavelength conversion member. For example, as a light source device for a vehicle headlamp It is very useful.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Optical Filters (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un dispositif source de lumière susceptible de détecter correctement et avec une précision élevée l'état d'un déflecteur qui amène la lumière à balayer à travers un élément de conversion de longueur d'onde, et un dispositif de projection de lumière pourvu de celui-ci. Un dispositif source de lumière (2) est pourvu d'une source de lumière laser, d'un élément de conversion de longueur d'onde (15), d'un déflecteur optique (14) et d'un détecteur de position (19). La source de lumière laser émet une lumière laser. L'élément de conversion de longueur d'onde (15) convertit la longueur d'onde de la lumière laser en une autre longueur d'onde et diffuse la lumière laser à longueur d'onde convertie. Le déflecteur optique (14) amène la lumière laser à balayer dans au moins une dimension sur une surface d'incidence de l'élément de conversion de longueur d'onde (15). Le détecteur de position (19) reçoit une lumière laser qui a été réfléchie de manière spéculaire au niveau de la surface d'incidence de l'élément de conversion de longueur d'onde (15), pour toute la plage de balayage au niveau de la surface d'incidence de l'élément de conversion de longueur d'onde (15) et délivre un signal de détection correspondant à une position de réception de lumière.
PCT/JP2018/003935 2017-02-15 2018-02-06 Dispositif source de lumière et dispositif de projection de lumière WO2018150942A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018568122A JP7065267B2 (ja) 2017-02-15 2018-02-06 光源装置および投光装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-026371 2017-02-15
JP2017026371 2017-02-15

Publications (1)

Publication Number Publication Date
WO2018150942A1 true WO2018150942A1 (fr) 2018-08-23

Family

ID=63169353

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/003935 WO2018150942A1 (fr) 2017-02-15 2018-02-06 Dispositif source de lumière et dispositif de projection de lumière

Country Status (2)

Country Link
JP (1) JP7065267B2 (fr)
WO (1) WO2018150942A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022102785A1 (fr) * 2020-11-16 2022-05-19 市光工業株式会社 Lampe de véhicule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6660710B1 (en) * 1999-11-12 2003-12-09 Kao Corporation Softener composition

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2767751A1 (fr) * 2013-02-14 2014-08-20 Valeo Vision Système d'éclairage adaptatif sécurisé
EP2821692A1 (fr) * 2013-06-28 2015-01-07 Valeo Vision Module optique sécurisé pour véhicule automobile comprenant une source laser
WO2016098319A1 (fr) * 2014-12-16 2016-06-23 パナソニックＩｐマネジメント株式会社 Dispositif d'éclairage, véhicule automobile équipé d'un dispositif d'éclairage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2767751A1 (fr) * 2013-02-14 2014-08-20 Valeo Vision Système d'éclairage adaptatif sécurisé
EP2821692A1 (fr) * 2013-06-28 2015-01-07 Valeo Vision Module optique sécurisé pour véhicule automobile comprenant une source laser
WO2016098319A1 (fr) * 2014-12-16 2016-06-23 パナソニックＩｐマネジメント株式会社 Dispositif d'éclairage, véhicule automobile équipé d'un dispositif d'éclairage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022102785A1 (fr) * 2020-11-16 2022-05-19 市光工業株式会社 Lampe de véhicule
EP4246036A4 (fr) * 2020-11-16 2024-06-05 Ichikoh Industries, Ltd. Lampe de véhicule

Also Published As

Publication number Publication date
JP7065267B2 (ja) 2022-05-12
JPWO2018150942A1 (ja) 2019-12-12

Similar Documents

Publication Publication Date Title
CN109416166B (zh) 发光装置以及照明装置
JP5656290B2 (ja) 半導体発光装置
JP5673247B2 (ja) 光源装置及びプロジェクター
JP2019160624A (ja) 光源装置および投光装置
JP2015184591A (ja) 光スキャナ及び車両用前照灯装置
US20190120462A1 (en) Light emission device and illumination device
JP2012220811A (ja) 光源装置の調整方法、光源装置及びプロジェクター
JP6033586B2 (ja) 照明装置および車両用前照灯
WO2018150942A1 (fr) Dispositif source de lumière et dispositif de projection de lumière
CN107436529B (zh) 一种光源装置以及投影显示装置
WO2018150889A1 (fr) Dispositif de source de lumière et dispositif de projection de lumière
WO2017126027A1 (fr) Roue de corps fluorescent, et unité d'émission de lumière et projecteur l'utilisant
JP2018147703A (ja) 光源装置
JP7046917B2 (ja) 波長変換素子及び発光装置
WO2018150814A1 (fr) Dispositif de source de lumière et dispositif de projection de lumière
JPWO2019049589A1 (ja) 光源装置および投光装置
JP2020087574A (ja) 光源装置および投光装置
JPWO2019044374A1 (ja) 光源装置および投光装置
JP7029608B2 (ja) 光源装置および投光装置
JP2020008363A (ja) 光測距装置
JP6998523B2 (ja) 光源装置および投光装置
WO2018173802A1 (fr) Dispositif de source de lumière et dispositif de projection de lumière
JP2021193667A (ja) 固体光源装置
KR20070117250A (ko) 레이저 백색조명장치
JP2019046749A (ja) 光源装置および投光装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18754110

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2018568122

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18754110

Country of ref document: EP

Kind code of ref document: A1