WO2015064497A1 - Dispositif de projection embarqué - Google Patents

Dispositif de projection embarqué Download PDF

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Publication number
WO2015064497A1
WO2015064497A1 PCT/JP2014/078337 JP2014078337W WO2015064497A1 WO 2015064497 A1 WO2015064497 A1 WO 2015064497A1 JP 2014078337 W JP2014078337 W JP 2014078337W WO 2015064497 A1 WO2015064497 A1 WO 2015064497A1
Authority
WO
WIPO (PCT)
Prior art keywords
projection
mirror
light
screen
vehicle
Prior art date
Application number
PCT/JP2014/078337
Other languages
English (en)
Japanese (ja)
Inventor
染野　義博
酒井　重史
Original Assignee
アルプス電気株式会社
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 アルプス電気株式会社 filed Critical アルプス電気株式会社
Publication of WO2015064497A1 publication Critical patent/WO2015064497A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2294—Addressing the hologram to an active spatial light modulator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0149—Head-up displays characterised by mechanical features
    • G02B2027/015—Head-up displays characterised by mechanical features involving arrangement aiming to get less bulky devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G03H2001/221—Element having optical power, e.g. field lens
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G03H2001/2213—Diffusing screen revealing the real holobject, e.g. container filed with gel to reveal the 3D holobject
    • G03H2001/2215—Plane screen
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2210/00—Object characteristics
    • G03H2210/20—2D object
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00—Active addressable light modulator
    • G03H2225/30—Modulation
    • G03H2225/32—Phase only

Definitions

  • the present invention relates to an in-vehicle projector that projects a display image on a display area that functions as a semi-reflective surface such as a windshield of an automobile.
  • Patent Document 1 discloses an invention related to an in-vehicle projection device called a head-up display.
  • This projection device is composed of an optical scanning device, and a first mirror and a second mirror that apply light from the optical scanning device to a semi-transmissive mirror that is a windshield.
  • the optical scanning device includes three light source elements that emit laser beams of different wavelengths, a combining element that combines the three types of laser light, and an optical deflector that applies the laser light combined by the combining element to the semi-transmissive mirror.
  • the optical deflector includes a minute mirror that swings with respect to two orthogonal axes.
  • a micro mirror is vibrated in a two-dimensional direction in an optical deflector, and a display image is generated when a laser beam scans a semi-transmissive mirror.
  • laser light is directly applied to a semi-transparent mirror such as a windshield, so it is dangerous because the laser light may be directly irradiated to the human eye when wiping and cleaning the outer surface of the windshield. is there.
  • the optical axes from the light source element toward the semi-transmissive mirror are all included in the same plane.
  • the present invention solves the above-described conventional problems, and an object thereof is to provide an in-vehicle projection apparatus that can perform a safe and clear display on a display area such as a windshield by using a laser beam. .
  • Another object of the present invention is to provide an in-vehicle projection apparatus that can be configured to be thin and small.
  • the present invention relates to an in-vehicle projection device that projects a display image onto a display area that functions as a semi-reflective surface in a vehicle interior of an automobile.
  • a laser light source a phase modulation array that phase-modulates laser light emitted from the laser light source, a screen that forms an image of a modulated light beam phase-modulated by the phase modulation array as a hologram image, and an image formed on the screen
  • a projection unit for enlarging the hologram image and projecting the hologram image onto the display area as the display image.
  • the on-vehicle projector of the present invention is safe because the hologram image generated from the laser beam is projected onto a semi-reflective surface such as a windshield, so that the laser beam does not directly enter the human eye.
  • a display image with a hologram image the dynamic range of luminance change can be expanded, and three-dimensional display changes such as changing the distance of the virtual image displayed in front of the display area can be performed. It is possible to give.
  • the projection light is applied upward from the projection unit to the display area, and the optical path of the modulated light beam directed from the phase modulation array to the screen is directed substantially horizontally.
  • the optical path of the laser light from the laser light source toward the phase modulation array is also directed substantially horizontally.
  • the in-vehicle projector can be made thin and can be easily embedded in a dashboard or the like in the vehicle interior.
  • the modulated light beam phase-modulated by the phase modulation array intersects with other light in the process of reaching the projection unit.
  • the projection unit is configured so that a first projection mirror and a second projection mirror are opposed to each other, and projection light including a hologram image formed on the screen receives the first projection mirror and the second projection mirror.
  • the modulated light beam reflected by the projection mirror and projected onto the display area and phase-modulated by the phase modulation array passes between the first projection mirror and the second projection mirror and passes through the screen.
  • the optical path of the projection light directed from the first projection mirror to the second projection mirror can be configured to intersect the modulated light flux.
  • first intermediate mirror and a second intermediate mirror are provided for directing the modulated light flux that has passed between the first projection mirror and the second projection mirror to the screen, and the second intermediate mirror is provided.
  • the screen is disposed on an optical path from an intermediate mirror toward the first projection mirror.
  • optical path from the second intermediate mirror to the first projection mirror and the optical path of the modulated light beam from the phase modulation array to the first intermediate mirror are opposite to each other.
  • the present invention Although it is possible to increase the magnification of the display image by lengthening the optical path for imaging the modulated light beam phase-modulated by the phase modulation array on the screen, in the present invention, by crossing the optical path in the apparatus, Even if the optical path is long, the apparatus can be made compact.
  • a plurality of apertures are arranged on an optical path from the phase modulation array to the screen.
  • the in-vehicle projector of the present invention does not directly apply laser light to a display area such as a windshield, it is safe for human eyes.
  • various display forms can be selected by using the hologram image.
  • the entire apparatus can be configured to be thin and small.
  • Explanatory drawing which shows the state with which the vehicle-mounted projection apparatus of embodiment of this invention was mounted in the vehicle
  • Explanatory drawing which shows an example of the display image by the vehicle projector.
  • 1 is an exploded perspective view of an in-vehicle projector according to an embodiment of the present invention
  • the top view which shows arrangement
  • the partial perspective view which shows the structure of a phase modulation part, and was seen from the V arrow direction shown in FIG.
  • FIG. 4 is a partial perspective view showing the configuration of the hologram imaging unit, seen from the direction of arrow VIII shown in FIG.
  • an in-vehicle projector 10 As shown in FIG. 1, an in-vehicle projector 10 according to an embodiment of the present invention is used by being embedded in a dashboard 2 in front of a passenger compartment of an automobile 1. A display image 70 shown in FIG. 2 is projected from the in-vehicle projection device 10 onto the display area 3 a of the windshield 3.
  • the display area 3a functions as a semi-reflective surface
  • the display image 70 projected on the display area 3a is reflected toward the driver 5 in the display area 3a, and a virtual image 6 is formed in front of the windshield 3. To do.
  • the virtual image 6 in front of the windshield 3 it appears to the driver 5 that various information is displayed in front of the steering wheel 4.
  • FIG. 3 and 4 show the overall structure of the in-vehicle projector 10.
  • the case of the in-vehicle projector 10 is separated into a lower case 11 and an upper case 12, and the optical unit 20 is housed inside the case.
  • the optical unit 20 has an optical base 21, and the optical base 21 is supported inside the lower case 11 via an elastic member such as an elastomer or a metal spring.
  • the lower case 11 is fixed to the interior of the dashboard 2 in the passenger compartment, but since the optical base 21 is supported via an elastic member, it is possible to prevent the vehicle body vibration from directly affecting the optical unit 20. .
  • the lower case 11 and the upper case 12 are positioned with respect to each other by concave and convex fitting by positioning pins 15 formed integrally with the lower case 11.
  • Female screw holes 16 are formed at a plurality of locations in the lower case 11, and fixing screws inserted through the upper case 12 are screwed into the female screw holes 16, so that the lower case 11 and the upper case 12 are fixed to each other.
  • the projection window 13 is opened in the upper case 12.
  • the projection window 13 is disposed so as to be exposed on the upper surface of the dashboard 2, and the display image 70 is projected from the projection window 13 onto the display area 3 a of the windshield 3.
  • a transparent cover plate 14 is attached to the projection window 13.
  • the cover plate 14 prevents dust from entering the case.
  • the cover plate 14 is configured with an optical filter that suppresses transmission of light having a wavelength other than the display light of the hologram image projected onto the display region 3a so that external light does not directly enter the case from the projection window 13. Is preferred.
  • the optical unit 20 includes a phase modulation unit 20A, a hologram imaging unit 20B, and a projection unit 20C due to the configuration of the optical components.
  • the reference base 22 is provided in the phase modulation unit 20A, and the reference base 22 is fixed on the optical base 21 by screws.
  • the first light emitting unit 23A and the second light emitting unit 23B are arranged so as to overlap each other.
  • the first light emitting unit 23A has a first positioning block 24A
  • the second light emitting unit 23B has a second positioning block 24B.
  • the first positioning block 24A is installed on a positioning reference surface 22A formed on the reference base 22, and is fixed to the reference base 22 with a plurality of fixing screws 25A.
  • the second positioning block 24B is installed on the first positioning block 24A, and is fixed to the first positioning block 24A with a plurality of fixing screws 25B.
  • FIG. 6 shows the internal structure of the second positioning block 24B.
  • An optical path 26B is formed in the positioning block 24B.
  • a second laser unit 27B which is a laser light source, is attached to the closed side end portion (the end portion on the right side of FIG. 6) of the optical path 26B.
  • the second laser unit 27B is configured by housing a semiconductor laser chip in a case.
  • a collimating lens 28B is fixed inside the light path 26B.
  • the laser beam B0 emitted from the second laser unit 27B is divergent light, and as shown in FIG. 7, the cross-sectional shape of the laser beam B0 is elliptical or oval.
  • the major axis of the laser beam B 0 is directed in the horizontal direction (i) parallel to the upper surface of the reference base 22, and the minor axis is directed in the vertical direction (ii) perpendicular to the upper surface of the reference base 22.
  • the effective diameter (effective region) of the collimator lens 28B is rectangular, and the long side of the rectangle is oriented in the same horizontal direction (i) as the major axis direction of the cross section of the laser beam B0. Yes. Therefore, when the laser beam B0 passes through the collimating lens 28B, it is converted into a collimated beam B1 having a rectangular cross section.
  • the opening end (opening end on the left side in FIG. 6) of the light path 26B of the positioning block 24B is closed by the light transmitting cover 29B.
  • the translucent cover 29B is preferably composed of a half-wave plate. When the half-wave plate is used, the polarization direction is changed by 90 degrees, and in the collimated light beam B1, the P wave component whose polarization direction is the horizontal direction (i) increases.
  • the luminous flux of the display image projected on the display area 3a is such that the polarization direction of many P-wave components is directed in the horizontal direction (i) with respect to the windshield 3.
  • the display image 70 is easily semi-reflected.
  • the first laser unit 27A is provided at the closed end of the internal optical path 26A (not shown in the drawing).
  • a collimating lens 28A (not shown) is housed in the optical path 26A, and the laser beam emitted from the first laser unit 27A has a rectangular cross section with a long side in the horizontal direction (i). Converted to B1.
  • a translucent cover 29A (not shown in the drawing) is provided at the opening end of the light passage 26A.
  • the phase modulation unit 20A is provided with a heat radiation cooling unit 37 that radiates heat generated from the first laser unit 27A and the second laser unit 27B.
  • the laser unit 27A of the first light emitting unit 23A and the laser unit 27B of the second light emitting unit 23B have different wavelengths of emitted laser light.
  • the wavelength of the collimated light beam B1 emitted from the first light emitting unit 23A is red at 642 nm
  • the wavelength of the collimated light beam B1 emitted from the second light emitting unit 23B is 515 nm.
  • the collimated light beam obtained from the first light emitting unit 23A will be described with reference symbol B1r
  • the collimated light beam obtained from the second light emitting unit 23B will be described with reference character B1g.
  • the reference base 22 is integrally formed with a positioning holding portion 22B, and the phase modulation array 31 is held inside a holding frame portion 22C formed in the positioning holding portion 22B. Since the positioning reference surface 22A for positioning the first light emitting part 23A and the second light emitting part 23B and the holding frame part 22C are integrally formed on the same reference base 21, the first light emitting part 23A and The collimated light beams B1r and B1g emitted from the second light emitting units 23B can be incident on the optical surface 31a of the phase modulation array 31 at an optimal incident angle.
  • the phase modulation array 31 is LCOS (Liquid Crystal On On Silicon).
  • LCOS is a reflective panel having a liquid crystal layer and an electrode layer such as aluminum.
  • electrodes that apply an electric field to a liquid crystal layer are regularly arranged to form a plurality of pixels. The tilt angle in the thickness direction of the crystal layer in the liquid crystal layer changes due to the change in electric field strength applied to each electrode, and the phase of the reflected laser light is changed for each pixel.
  • the phase modulation unit 20A is provided with a heat radiation cooling unit 38 that radiates heat generated in the phase modulation array 31.
  • the collimated light beam B1r converted by the collimating lens 28A in the first light emitting unit 23A is given to the region below the phase modulation array 31, and the collimating lens 28B in the second light emitting unit 23B.
  • the collimated light beam B1g converted in (1) is given to the upper region of the phase modulation array 31.
  • the region to which the collimated light beam B1r is given becomes the first modulation region M1
  • the region to which the collimated light beam B1g is given becomes the second modulation region M2.
  • the first modulation region M1 and the second modulation region M2 are also rectangular.
  • the first modulation region M1 and the second modulation region M2 are set so as not to overlap each other.
  • the phase of the collimated light beam B1r given to the first modulation region M1 is modulated by passing through each of the plurality of pixels of the phase modulation array 31, and the collimated light beam B1g given to the second modulation region M2 is also The phase is modulated by passing through each of the plurality of pixels.
  • the modulated light beam B ⁇ b> 2 reflected from the phase modulation array 31 becomes interference light in which lights that have passed through the respective pixels interfere with each other.
  • the interference light includes interference between light components of the red collimated light beam B1r, interference between light components of the green collimated light beam B1g, and further, light components of the collimated light beam B1r and the collimated light beam B1g. Interference.
  • a lens holder 32 is provided in the phase modulation unit 20A.
  • the lens holder 32 is positioned and fixed on the reference base 22.
  • An FT lens (Fourier transform lens) 33 is held on the lens holder 32.
  • the modulated light beam B2 reflected by the phase modulation array 31 is transmitted through the FT lens 33 to become a modulated light beam B3 subjected to Fourier transform.
  • the phase modulator 20A is provided with a light transmission mirror 34 held by a mirror holder 34a.
  • the light transmission mirror 34 is a plane mirror, and the optical axis of the FT lens 33 is incident on the reflection surface at a predetermined angle.
  • the modulated light beam B3 Fourier-transformed by the FT lens 33 is reflected by the light transmission mirror 34, and the reflected modulated light beam B4 passes through the optical unit 20 and is sent to the hologram imaging unit 20B.
  • the hologram imaging unit 20B is provided with a first intermediate mirror 35 held by the mirror holding unit 35a and a second intermediate mirror 36 held by the mirror holding unit 36a. Yes.
  • the first intermediate mirror 35 and the second intermediate mirror 36 are plane mirrors.
  • the reflection surface of the first intermediate mirror 35 faces the reflection surface of the light transmission mirror 34 provided in the phase modulation unit 20A. Further, the reflecting surfaces of the first intermediate mirror 35 and the second intermediate mirror 36 face each other at a predetermined angle.
  • the screen 51 is arranged in the reflection direction by the reflection surface of the second intermediate mirror 36.
  • the modulated light beam B4 reflected by the light transmission mirror 34 travels in the right direction in the figure after being reflected in the first intermediate mirror 35, and the reflected modulated light beam B5 is second reflected. Are reflected by the intermediate mirror 36. Then, the modulated light beam B 6 reflected by the second intermediate mirror 36 is given to the screen 51.
  • the phase of the red laser light is modulated for each pixel in the first modulation region M1, and the green laser light is modulated for each pixel in the second modulation region M2.
  • the light in which the interference light of the red and green laser beams is mixed is Fourier-transformed by the FT lens, and the modulated light beams B3, B4, B5, and B6 are defocused on the screen 51 through the optical path in the case.
  • the hologram image is formed on the screen 51.
  • the first-order diffracted light is imaged on the screen 51.
  • a hologram image having substantially the same content as the display image 70 posted in the display area 3a shown in FIG.
  • This hologram image is formed with a red color and a green color and a mixed color of two hues. Since the modulated light beams B3, B4, B5, and B6 contain light interference components, a large number of stray light images generated by second-order diffracted light, third-order diffracted light, and the like exist in the space from the phase modulation array 31 to the screen 51. . Therefore, a plurality of apertures are formed on the optical path from the phase modulation array 31 to the screen 51 so that only the first-order diffracted light can reach the screen 51.
  • a light shielding wall 41a is provided at a light emitting portion from the phase modulation unit 20A, and a rectangular first aperture 41 is opened in the light shielding wall 41a.
  • a light shielding wall 42a is provided at a light incident portion on the hologram imaging portion 20B, and a rectangular second aperture 42 is opened in the light shielding wall 42a.
  • a light shielding wall 43a is provided between the second intermediate mirror 36 and the screen 51, and a rectangular third aperture 43 is opened in the light shielding wall 43a.
  • the third aperture 43 is also shown in FIG.
  • Three-stage apertures 41, 42, and 43 are provided on the optical path from the modulated light beam reflected by the light transmission mirror 34 to the screen 51, and stray light other than the first-order diffracted light is shielded. Only the first-order diffracted light that forms the image can be reached.
  • a screen 51 is disposed on the front side (light emission side) of the third aperture 43.
  • the modulated light beam B ⁇ b> 6 reflected by the second intermediate mirror 36 passes through the third aperture 43 and reaches the screen 51, and a hologram image by the first-order diffracted light is generated on the screen 51.
  • the screen 51 is a transmissive diffuser having fine irregularities formed on the surface, and light including a hologram image formed on the screen 51 passes through the screen 51 and becomes divergent projection light B7. .
  • the projection light B7 passes through the fourth aperture 44 formed in the light shielding wall 42a and is given to the projection unit 20C.
  • the motor 52 is fixed to the light shielding wall 43 a in which the third aperture 43 is opened, and the disk-shaped screen 51 is always rotated by the power of the motor 52. It has been made. By rotating the screen 51, speckle noise that causes flickering of the display image 70 can be reduced.
  • a monitor detection unit 53 is provided on the light shielding wall 43a.
  • the monitor detection unit 53 is provided below the third aperture 43.
  • the monitor detection unit 53 includes three detection units: a red wavelength detection unit 53a, a green wavelength detection unit 53b, and a position detection unit 53c.
  • Each of the detectors 53a, 53b, and 53c has a light receiving element such as a pin photodiode housed in a closed space, and an opening is formed on the side facing the second intermediate mirror 36.
  • the opening is covered with a wavelength filter that transmits red light
  • the green wavelength detection unit 53b the opening is covered with a wavelength filter that transmits green light.
  • Each detection unit 53a, 53b, 53c is irradiated with either the first-order diffracted light or multi-order diffracted light other than the first-order diffracted light. Based on the detection output of the position detection unit 53c, the positions of the first light emitting unit 23A, the second light emitting unit 23B, and other optical components are adjusted. Further, the emission intensity of the first laser unit 27A and the second laser unit 27B is automatically adjusted based on the detection outputs from the red wavelength detection unit 53a and the green wavelength detection unit 53b, and the phase modulation by the phase modulation array 31 is performed. Operation is also automatically controlled.
  • the projection unit 20C is provided with a first projection mirror 55 and a second projection mirror 56 facing each other.
  • the reflecting surface 55a of the first projection mirror 55 and the reflecting surface 56a of the second projection mirror 56 are concave mirrors (magnifying mirrors).
  • the projection light B 7 including the hologram image formed on the screen 51 is diverged by the screen 51 and given to the first projection mirror 55.
  • the projection light B8 obtained by enlarging the hologram image by the first projection mirror 55 is given to the second projection mirror 56, and the hologram image is further enlarged.
  • the projection light B9 reflected by the reflecting surface 56a of the second projection mirror 56 becomes an upward light beam, passes through the cover plate 14, and, as shown in FIG. 1, the display area of the windshield 3 3a is projected.
  • the display image 70 various information associated with the traveling of the vehicle such as a vehicle speed display 71, a shift lever position information 72, and navigation information 73 are displayed.
  • the display image 70 is displayed with red light or green light, or is displayed with a mixed color of red light and green light.
  • the windshield 3 functions as a semi-reflective surface, it appears to the driver 5 that the display image 70 exists at the imaging position of the virtual image 6 ahead of the windshield 3.
  • the optical base 21 of the optical unit 20 is oriented almost horizontally.
  • collimated light beams B1r and B1g emitted from the first light emitting unit 23A and the second light emitting unit 23B, the modulated light beam B2 modulated by the phase modulation array 31, and the modulated light beam B3 through the FT lens.
  • These optical axes extend horizontally so as to be parallel to the optical base 21.
  • the optical axes of the modulated light beam B4 reflected by the light transmission mirror 34, the modulated light beam B5 reflected by the first intermediate mirror 35, and the modulated light beam B6 reflected by the second intermediate mirror 36 are also represented by the optical base. 21 and extends horizontally.
  • the optical axis of the projection light B7 that has passed through the screen 51 is also horizontal, and the projection light B8 reflected by the first projection mirror 55 is given slightly upward to the second projection mirror 56, so that the second projection mirror 56
  • the projection light B ⁇ b> 9 reflected by 56 is irradiated upward toward the windshield 3.
  • the in-vehicle projector 10 can be configured to be thin, It becomes easy to embed inside the dashboard 2.
  • the modulated light beam B ⁇ b> 4 from the light transmission mirror 34 to the first intermediate mirror 35 passes between the first projection mirror 55 and the second projection mirror 56, and the first The projection light B8 directed from the projection mirror 55 to the second projection mirror 56 intersects the modulated light beam B4.
  • a long optical path from the FT lens 33 to the screen 51 can be secured, and a hologram image can be formed on the screen 51 at an appropriate magnification.
  • the in-vehicle projector 10 can be made compact even if the optical path is long.
  • the direction of the light is opposite between the modulated light beam B4 directed from the light transmission mirror 34 to the first intermediate mirror 35 and the modulated light beam B6 directed from the second intermediate mirror 36 to the screen 51.
  • the direction of the projection light B7 from the screen 51 toward the first projection mirror 55 is also opposite to the direction of the modulated light beam B4.
  • the entire apparatus can also be made compact by reversing the direction of the light beam in the case.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Instrument Panels (AREA)

Abstract

L'invention a pour objet de réaliser un dispositif de projection embarqué qui peut projeter en toute sécurité une image d'affichage sur un pare-brise, même en utilisant de la lumière laser, et qui peut être réalisé de petite taille. Selon l'invention, un faisceau collimaté de lumière laser émise par une unité d'émission de lumière (23A, 23B) est converti par une lentille FT (33), réfléchi par un miroir de transmission de lumière (34), puis réfléchi par un premier miroir intermédiaire (35) et un deuxième miroir intermédiaire (36) de telle sorte qu'une image holographique est formée sur un écran (51). La lumière de projection (B7) qui contient ladite image holographique est réfléchie par un premier miroir de projection (55) et la lumière de projection réfléchie (B8) est en plus réfléchie par un deuxième miroir de projection (56) de telle sorte qu'une image d'affichage est projetée sur un pare-brise. Du fait que le faisceau de lumière de modulation (B4) et la lumière de projection (B8) se croisent mutuellement entre le premier miroir de projection (55) et le deuxième miroir de projection (56), le dispositif dans son ensemble peut être réalisé de petite taille, même si le trajet de la lumière est long.
PCT/JP2014/078337 2013-10-31 2014-10-24 Dispositif de projection embarqué WO2015064497A1 (fr)

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JP2016133700A (ja) * 2015-01-21 2016-07-25 パイオニア株式会社 ヘッドアップディスプレイ
FR3050039A1 (fr) * 2016-04-12 2017-10-13 Valeo Comfort & Driving Assistance Afficheur tete haute
CN109388016A (zh) * 2017-08-02 2019-02-26 杜尔利塔斯有限公司 全息投影仪
EP3605191A4 (fr) * 2017-11-14 2020-05-13 JVCKENWOOD Corporation Dispositif d'affichage d'image virtuelle
US11644793B2 (en) 2019-04-11 2023-05-09 Dualitas Ltd. Diffuser assembly

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JP2004226469A (ja) * 2003-01-20 2004-08-12 Denso Corp 車両用ヘッドアップディスプレイ装置
JP2009042373A (ja) * 2007-08-07 2009-02-26 Seiko Epson Corp プロジェクタ
WO2012007762A1 (fr) * 2010-07-14 2012-01-19 Two Trees Photonics Limited Système d'affichage holographique 2d/3d
JP2012501472A (ja) * 2008-08-26 2012-01-19 マイクロビジョン，インク． 小型ヘッドアップディスプレイの光リレー
JP2013015738A (ja) * 2011-07-06 2013-01-24 Nippon Seiki Co Ltd ヘッドアップディスプレイ装置

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JP2004226469A (ja) * 2003-01-20 2004-08-12 Denso Corp 車両用ヘッドアップディスプレイ装置
JP2009042373A (ja) * 2007-08-07 2009-02-26 Seiko Epson Corp プロジェクタ
JP2012501472A (ja) * 2008-08-26 2012-01-19 マイクロビジョン，インク． 小型ヘッドアップディスプレイの光リレー
WO2012007762A1 (fr) * 2010-07-14 2012-01-19 Two Trees Photonics Limited Système d'affichage holographique 2d/3d
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016133700A (ja) * 2015-01-21 2016-07-25 パイオニア株式会社 ヘッドアップディスプレイ
FR3050039A1 (fr) * 2016-04-12 2017-10-13 Valeo Comfort & Driving Assistance Afficheur tete haute
WO2017178565A1 (fr) * 2016-04-12 2017-10-19 Valeo Comfort And Driving Assistance Afficheur tête haute
CN109388016A (zh) * 2017-08-02 2019-02-26 杜尔利塔斯有限公司 全息投影仪
GB2567408A (en) * 2017-08-02 2019-04-17 Dualitas Ltd Holographic projector
GB2567408B (en) * 2017-08-02 2020-12-02 Dualitas Ltd Holographic projector
CN109388016B (zh) * 2017-08-02 2022-02-22 杜尔利塔斯有限公司 全息投影仪
US11409242B2 (en) 2017-08-02 2022-08-09 Dualitas Ltd Holographic projector
EP3605191A4 (fr) * 2017-11-14 2020-05-13 JVCKENWOOD Corporation Dispositif d'affichage d'image virtuelle
US11092804B2 (en) 2017-11-14 2021-08-17 Jvckenwood Corporation Virtual image display device
US11644793B2 (en) 2019-04-11 2023-05-09 Dualitas Ltd. Diffuser assembly

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