WO2021256456A1 - Head-up display device - Google Patents

Head-up display device Download PDF

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Publication number
WO2021256456A1
WO2021256456A1 PCT/JP2021/022626 JP2021022626W WO2021256456A1 WO 2021256456 A1 WO2021256456 A1 WO 2021256456A1 JP 2021022626 W JP2021022626 W JP 2021022626W WO 2021256456 A1 WO2021256456 A1 WO 2021256456A1
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WIPO (PCT)
Prior art keywords
display
wedge
head
display light
display device
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PCT/JP2021/022626
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French (fr)
Japanese (ja)
Inventor
久敏 丸岡
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日本精機株式会社
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Publication of WO2021256456A1 publication Critical patent/WO2021256456A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • 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

Definitions

  • This disclosure relates to a head-up display device.
  • the head-up display device described in Patent Document 1 has a display that emits display light, a reflective member that reflects the display light to the windshield, and changes the angle of the reflective member around a shaft portion along the vehicle width direction. It is provided with a driving means.
  • the irradiation position of the display light emitted to the viewer can be moved in the height direction according to the viewpoint of the viewer. ..
  • the viewpoint of the viewer is shifted in the vehicle width direction
  • the irradiation position of the display light cannot be shifted in the vehicle width direction, and the irradiation position of the display light may not match the viewpoint of the viewer.
  • the present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a head-up display device capable of adjusting the irradiation position of the display light to the viewpoint of the viewer.
  • the head-up display device is A head-up display device that displays a virtual image by projecting display light onto a projected member.
  • a display that emits the display light and The first and second wedge prisms arranged along the optical path of the display light from the display to the projected member and transmitting the display light from the display, and
  • Each of the first and second wedge prisms is provided with a drive unit for rotating each of the first and second wedge prisms about a rotation axis along the optical path.
  • the irradiation position of the display light can be adjusted to the viewpoint of the viewer.
  • the X direction is along the vehicle width direction
  • the Y direction is along the vehicle front-rear direction
  • the Z direction is along the height direction.
  • the head-up display device 100 is mounted in the dashboard of the vehicle 200.
  • the head-up display device 100 emits display light L representing an image toward the windshield 201, which is an example of the projected member of the vehicle 200.
  • the display light L is reflected by the windshield 201 and reaches the viewer 1 (mainly the driver of the vehicle 200).
  • the head-up display device 100 displays the virtual image V including the vehicle information so as to be visible to the viewer 1.
  • the head-up display device 100 adjusts the irradiation center position P to the viewpoint of the viewer 1 by moving the irradiation center position P of the display light L with respect to the viewer 1 within the movable range Ar.
  • the display light L is irradiated into the eye box Eb centered on the irradiation center position P.
  • the eyebox Eb has a rectangular shape that is long in the X direction and short in the Z direction.
  • the head-up display device 100 includes a display 10, a reflector 20, a concave mirror 30, mirror holders 21 and 31, an irradiation position moving unit 40, a housing 60, and a control unit 70. And.
  • the display 10 emits a display light L representing an image under the control of the control unit 70.
  • the display 10 may be composed of, for example, a TFT (Thin Film Transistor) type liquid crystal display panel illuminated by a light source, or may be composed of an organic EL display (OELD: Organic Electro-Luminescence Display).
  • TFT Thin Film Transistor
  • OELD Organic Electro-Luminescence Display
  • the reflecting mirror 20 is a plane mirror that reflects the display light L from the display 10 toward the concave mirror 30.
  • the mirror holder 21 supports the reflector 20 from the back surface of the reflector 20 and is fixed in the optical path space Sc of the housing 60.
  • the concave mirror 30 reflects the display light L reflected by the reflector 20 while enlarging it toward the windshield 201.
  • the mirror holder 31 supports the concave mirror 30 from the back surface of the concave mirror 30 and is fixed in the optical path space Sc of the housing 60.
  • the housing 60 is made of a non-transmissive resin or metal in a box shape, and has an optical path space Sc through which the display light L passes.
  • Each configuration of the head-up display device 100 is housed in the housing 60.
  • the housing 60 is formed with an opening 61 at a position facing the windshield 201 (see FIG. 1).
  • the housing 60 includes a curved plate-shaped window plate material 50 that closes the opening 61.
  • the window plate material 50 is made of a translucent resin such as acrylic through which the display light L is transmitted.
  • the irradiation position moving unit 40 has a first wedge prism 41, a second wedge prism 42, a first drive unit 43 for rotating the first wedge prism 41, and a second wedge prism 42 for rotating the first wedge prism 41.
  • a storage case for accommodating the drive unit 44 of 2, the prism holders 45 and 46 for holding the first and second wedge prisms 41 and 42, and the first and second wedge prisms 41 and 42 and the prism holders 45 and 46. 47 and.
  • the first and second wedge prisms 41 and 42 are arranged along the optical axis direction JL of the display light L.
  • the first and second wedge prisms 41 and 42 are arranged so that their respective thickness directions are along the optical axis direction JL of the display light L.
  • the second wedge prism 42 is provided at a position closer to the concave mirror 30 than the first wedge prism 41 in the optical path of the display light L.
  • the first and second wedge prisms 41 and 42 each have a disc shape with an inclined exit surface due to a transmissive member.
  • the first wedge prism 41 includes an incident surface 41a on which the display light L is incident and an exit surface 41b that emits the display light L.
  • the incident surface 41a extends in a direction orthogonal to the rotation axis Ax1.
  • the exit surface 41b extends in a direction inclined with respect to the incident surface 41a.
  • the first wedge prism 41 emits the display light L transmitted through the incident second wedge prism 42 toward the windshield 201 after refracting the display light L transmitted in the direction in which the thickness of the first wedge prism 41 is thicker. ..
  • the second wedge prism 42 includes an incident surface 42a on which the display light L is incident and an exit surface 42b that emits the display light L.
  • the incident surface 42a extends in a direction orthogonal to the rotation axis Ax2.
  • the exit surface 42b extends in a direction inclined with respect to the incident surface 42a.
  • the second wedge prism 42 refracts the display light L reflected from the incident concave mirror 30 in the direction in which the thickness of the second wedge prism 42 is thicker, and then emits the display light L toward the first wedge prism 41.
  • the thickness of the second wedge prism 42 is formed to be thinner than the thickness of the first wedge prism 41.
  • the wedge angle ⁇ 1 of the first wedge prism 41 is formed at an angle equal to or greater than the wedge angle ⁇ 2 of the second wedge prism 42.
  • the wedge angles ⁇ 1 and ⁇ 2 are angles formed by the exit surfaces 41b and 42b with respect to the incident surfaces 41a and 42a.
  • the wedge angle ⁇ 2 is a value corresponding to the turning radius R1 of the movable rotation center F2 shown in FIG. 6 described later
  • the wedge angle ⁇ 1 is a value corresponding to the turning radius R2 of the irradiation center position P shown in FIG. 6 described later.
  • the prism holder 45 surrounds the first wedge prism 41 and holds the first wedge prism 41.
  • the prism holder 46 surrounds the second wedge prism 42 and holds the second wedge prism 42.
  • the storage case 47 has a cylindrical shape penetrating in the optical axis direction JL.
  • the prism holders 45 and 46 are rotatably housed in the storage case 47.
  • the storage case 47 is fixed in the optical path space Sc of the housing 60.
  • the first drive unit 43 rotates the first wedge prism 41 around the rotation axis Ax1 (see FIG. 5) along the optical axis direction JL under the control of the control unit 70.
  • the rotation axis Ax1 passes through the center of the first wedge prism 41.
  • the first drive unit 43 includes, for example, a motor 43a driven by the control unit 70 and a transmission mechanism 43b that transmits the rotational force of the motor 43a to the prism holder 45.
  • the transmission mechanism 43b is, for example, a gear that meshes with the outer peripheral surface of the prism holder 45 in which the first wedge prism 41 is held.
  • the second drive unit 44 rotates the second wedge prism 42 around the rotation axis Ax2 (see FIG. 4) along the optical axis direction JL under the control of the control unit 70.
  • the rotation axis Ax2 passes through the center of the second wedge prism 42.
  • the second drive unit 44 includes a motor 44a and a transmission mechanism 44b, similarly to the first drive unit 43.
  • the control unit 70 controls the display 10, the first drive unit 43, and the second drive unit 44.
  • the control unit 70 is a microcomputer composed of a CPU (Central Processing Unit), a ROM (ReadOnlyMemory), a RAM (RandomAccessMemory), and the like.
  • the control unit 70 emits the display light L through the display 10. Further, the control unit 70 acquires the viewpoint information Ie indicating the position information of the viewpoint of the viewer 1, and based on the acquired viewpoint information Ie, the first and second wedges are passed through the first and second drive units 43 and 44. By rotating the prisms 41 and 42, the irradiation center position P of the display light L is adjusted to the viewpoint indicated by the viewpoint information IE.
  • the display light L forms a long rectangular shape in the vehicle width direction when cut from the direction orthogonal to the optical axis of the display light L.
  • the irradiation center position P is located at the center of this rectangular shape. For example, the control unit 70 aligns the irradiation center position P with the center of both eyes of the viewer 1.
  • the viewpoint information IE is, for example, information in which the viewpoint of the viewer 1 is estimated based on the image information of the face of the viewer 1 captured by the camera.
  • the control unit 70 may acquire the image information of the face of the viewer 1 as the viewpoint information IE, and estimate the viewpoint of the viewer 1 based on the acquired viewpoint information IE.
  • the movement mode of the irradiation center position P accompanying the rotation of each of the first and second wedge prisms 41 and 42 will be described.
  • the movable rotation center F2 rotates along the circumference C1 about the fixed rotation center F1. Seen from the viewer 1, the rotation direction of the second wedge prism 42 and the rotation direction of the movable rotation center F2 are the same.
  • the rotation angle of the second wedge prism 42 corresponds to the rotation angle of the movable rotation center F2 centered on the fixed rotation center F1. For example, when the second wedge prism 42 is rotated by 1 °, the movable rotation center F2 rotates by 1 ° along the circumference C1.
  • the irradiation center position P rotates along the circumference C2 centered on the movable rotation center F2. Seen from the viewer 1, the rotation direction of the first wedge prism 41 and the rotation direction of the irradiation center position P are the same.
  • the rotation angle of the first wedge prism 41 corresponds to the rotation angle of the irradiation center position P along the circumference C2. For example, when the first wedge prism 41 is rotated by 1 °, the irradiation center position P is rotated by 1 ° along the circumference C2.
  • the movable rotation center F2 is movable along the circumference C1
  • the irradiation center position P is configured to be movable along the circumference C2 with the movable rotation center F2 as the center. Therefore, the irradiation center position P can be moved within the movable range Ar.
  • the movable range Ar forms a circle having a radius Rr of the value obtained by adding the radius of gyration R1 of the circumference C1 and the radius of gyration R2 of the circumference C2.
  • the circumferences C1 and C2 may be either a perfect circle or an ellipse.
  • the turning radius R2 of the circumference C2 is set to be equal to or higher than the turning radius R1 of the circumference C1.
  • the irradiation center position P can be moved over the entire range of the circular movable range Ar.
  • the movable range Ar forms an annular shape centered on the fixed rotation center F1, and the central portion of the movable range Ar.
  • An unreachable region Ad in which the irradiation center position P cannot move is formed.
  • the control unit 70 moves the circumference C2 together with the movable rotation center F2 so as to be in contact with the viewpoint Ep as shown by the arrow Yj1 in FIG. 7 by rotating the second wedge prism 42 through the second drive unit 44. Let me.
  • the control unit 70 rotates the first wedge prism 41 through the first drive unit 43, so that the irradiation center position P is set to the viewpoint Ep along the circumference C2 as shown by the arrow Yj2 in FIG. Move it closer. As a result, the irradiation center position P moves from the second position Pb to the third position Pc corresponding to the viewpoint Ep.
  • the control unit 70 may rotate the first and second wedge prisms 41 and 42 at the same time, or may rotate them in order.
  • the head-up display device 100 displays a virtual image V by projecting the display light L onto the windshield 201 which is an example of the projected member.
  • the head-up display device 100 is arranged along the optical path of the display 10 that emits the display light L and the display light L from the display 10 to the windshield 201, and transmits the display light L from the display 10.
  • the first and second wedge prisms 41 and 42 which are examples of the driving unit that rotates the first and second wedge prisms 41 and 42 about the rotation axes Ax1 and Ax2 along the optical path, respectively.
  • the drive units 43 and 44 are provided.
  • the head-up display device 100 adjusts the rotational position of the first wedge prism 41 via the first drive unit 43, and the second wedge prism 42 via the second drive unit 44.
  • the rotation position of By adjusting the rotation position of, the irradiation center position P of the display light L emitted toward the viewer 1 can be adjusted in the X direction and the Y direction so as to match the viewpoint of the viewer 1. This makes it possible to improve the visibility of the virtual image V.
  • the irradiation center position P can be adjusted to the viewpoint of the viewer 1 through the rotation of the first and second wedge prisms 41 and 42, the display light L is displayed from the display 10 to the first and second wedge prisms 41, The size of the relay optical system including the reflector 20 and the concave mirror 30 that relay to 42 can be reduced.
  • the irradiation center position P can be moved according to the viewpoint of the viewer 1 in the X direction, the lengths of the reflecting mirror 20 and the concave mirror 30 in the X direction. Can be shortened. Therefore, the head-up display device 100 can be compactly configured.
  • the second wedge prism 42 is provided at a position closer to the display 10 than the first wedge prism 41 in the optical path.
  • the wedge angle ⁇ 1 of the first wedge prism 41 is formed at an angle equal to or larger than the wedge angle ⁇ 2 of the second wedge prism 42.
  • the wedge angle ⁇ 2 is a value corresponding to the turning radius R1 of the movable rotation center F2 shown in FIG. 6, and the wedge angle ⁇ 1 is a value corresponding to the turning radius R2 of the irradiation center position P shown in FIG. .. If the wedge angle ⁇ 1 is less than the wedge angle ⁇ 2, the circumference C2 centered on the movable rotation center F2 cannot reach the fixed rotation center F1 as shown in the comparative example of FIG.
  • the movable range Ar that can be moved becomes an annular shape when viewed from the viewer 1, and a non-reachable area Ad that the irradiation center position P cannot reach is formed in the center of the movable range Ar.
  • the wedge angle ⁇ 1 is an angle equal to or larger than the wedge angle ⁇ 2
  • the circumference C2 centered on the movable rotation center F2 can reach the fixed rotation center F1, and the non-reachable region Ad is not formed.
  • the movable range Ar can be formed in a circular shape. Therefore, the irradiation center position P can be adjusted more reliably so as to match the viewpoint of the viewer 1, and the visibility of the virtual image V can be improved.
  • the head-up display device 100 includes a concave mirror 30 which is an example of a mirror that reflects the display light L from the display device 10 toward the windshield 201.
  • the first and second wedge prisms 41 and 42 are provided between the concave mirror 30 and the windshield 201 in the optical path. According to this configuration, the first and second wedge prisms 41 and 42 for controlling the irradiation direction of the display light L are provided after the concave mirror 30 in the optical path, so that the size of the concave mirror 30 can be suppressed and the head-up can be achieved.
  • the display device 100 can be compactly configured. Further, the concave mirror 30 is fixed in the optical path space Sc of the housing 60 via the mirror holder 31. Therefore, since the drive mechanism for rotating the concave mirror 30 is not required, the configuration around the concave mirror 30 can be simplified.
  • the head-up display device 100 rotates the second wedge prism 42 through the second drive unit 44 to rotate the movable rotation center F2 around the fixed rotation center F1 along the circumference C1.
  • a unit 70 is provided. According to this configuration, the control unit 70 can move and control the irradiation center position P within the movable range Ar having a radius Rr obtained by adding the turning radius R1 of the circumference C1 and the turning radius R2 of the circumference C2. .. Therefore, the irradiation center position P can be adjusted more reliably so as to match the viewpoint of the viewer 1, and the visibility of the virtual image V can be improved.
  • the head-up display device 100 includes the first and second wedge prisms 41 and 42, but the number of wedge prisms is not limited to two and may be three or more. By increasing the number of wedge prisms, it is possible to increase the area of the movable range Ar while keeping the wedge angle small. By reducing the wedge angle, the wedge prism can be made thinner and can be configured more compactly.
  • the irradiation center position is as shown in FIG. 8 by rotating the third wedge prism. P rotates along the circumference C3 around the movable rotation center F3 located on the circumference C2.
  • the wedge angle ⁇ 1 of the first wedge prism 41 may be formed at an angle smaller than the wedge angle ⁇ 2 of the second wedge prism 42.
  • the reflecting mirror 20 in the above embodiment is not limited to a plane mirror, and may be a concave mirror. Further, the reflecting mirror 20 may be omitted, and the display light L from the display 10 may be directly applied to the concave mirror 30. Further, the concave mirror 30 may be omitted, and the display light L from the display 10 may be directly applied to the first and second wedge prisms 41 and 42.
  • the head-up display device 100 is mounted on the vehicle 200, but it may be mounted on a vehicle such as an airplane or a ship other than the vehicle 200. Further, the projected member is not limited to the windshield, and may be a dedicated combiner.
  • control unit 70 may move the irradiation center position P in response to a switch operation by the viewer 1.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
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Abstract

Provided is a head-up display device capable of matching the illumination position of display light to the viewpoint of a viewer. A head-up display device 100 displays a virtual image by projecting display light L onto a windshield. The head-up display device 100 is provided with: a display unit 10 for emitting the display light L; first and second wedge prisms 41, 42 which are disposed on the optical path of the display light L from the display unit 10 to the windshield, and which transmit the display light L from the display unit 10; and first and second drive portions 43, 44 for rotating the first and second wedge prisms 41, 42 respectively about an axis of rotation along the optical path.

Description

ヘッドアップディスプレイ装置Head-up display device
　本開示は、ヘッドアップディスプレイ装置に関する。 This disclosure relates to a head-up display device.
　例えば、特許文献１に記載のヘッドアップディスプレイ装置は、表示光を発する表示器と、表示光をフロントガラスに反射させる反射部材と、車幅方向に沿う軸部を中心に反射部材の角度を変える駆動手段と、を備える。 For example, the head-up display device described in Patent Document 1 has a display that emits display light, a reflective member that reflects the display light to the windshield, and changes the angle of the reflective member around a shaft portion along the vehicle width direction. It is provided with a driving means.
特開２００３－１０７３９１号公報Japanese Unexamined Patent Publication No. 2003-107391
　上記特許文献１に記載の構成において、駆動手段により反射部材の角度が変えられることにより、視認者に照射される表示光の照射位置が視認者の視点に合わせて高さ方向に移動可能となる。しかしながら、視認者の視点が車幅方向にずれている場合には表示光の照射位置を車幅方向にずらすことができず、表示光の照射位置が視認者の視点に合わないおそれがある。 In the configuration described in Patent Document 1, by changing the angle of the reflecting member by the driving means, the irradiation position of the display light emitted to the viewer can be moved in the height direction according to the viewpoint of the viewer. .. However, when the viewpoint of the viewer is shifted in the vehicle width direction, the irradiation position of the display light cannot be shifted in the vehicle width direction, and the irradiation position of the display light may not match the viewpoint of the viewer.
　本開示は、上記実状を鑑みてなされたものであり、表示光の照射位置を視認者の視点に合わせることができるヘッドアップディスプレイ装置を提供することを目的とする。 The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a head-up display device capable of adjusting the irradiation position of the display light to the viewpoint of the viewer.
　上記目的を達成するため、本開示に係るヘッドアップディスプレイ装置は、
　表示光を被投射部材に投射することにより虚像を表示するヘッドアップディスプレイ装置であって、
　前記表示光を出射する表示器と、
　前記表示器から前記被投射部材までの前記表示光の光路に沿って配置され、前記表示器からの前記表示光を透過させる第１及び第２のウェッジプリズムと、
　前記第１及び第２のウェッジプリズムそれぞれを前記光路に沿う回転軸を中心に回転させる駆動部と、を備える。 In order to achieve the above object, the head-up display device according to the present disclosure is
A head-up display device that displays a virtual image by projecting display light onto a projected member.
A display that emits the display light and
The first and second wedge prisms arranged along the optical path of the display light from the display to the projected member and transmitting the display light from the display, and
Each of the first and second wedge prisms is provided with a drive unit for rotating each of the first and second wedge prisms about a rotation axis along the optical path.
　本開示によれば、ヘッドアップディスプレイ装置において、表示光の照射位置を視認者の視点に合わせることができる。 According to the present disclosure, in the head-up display device, the irradiation position of the display light can be adjusted to the viewpoint of the viewer.
本開示の一実施形態に係るヘッドアップディスプレイ装置が搭載された車両の概略図である。It is a schematic diagram of the vehicle equipped with the head-up display device which concerns on one Embodiment of this disclosure. 本開示の一実施形態に係るヘッドアップディスプレイ装置の模式的な断面図である。It is a schematic sectional view of the head-up display device which concerns on one Embodiment of this disclosure. 本開示の一実施形態に係る表示光の光路を示す概略図である。It is a schematic diagram which shows the optical path of the indicator light which concerns on one Embodiment of this disclosure. 本開示の一実施形態に係る第２のウェッジプリズムの側面図である。It is a side view of the 2nd wedge prism which concerns on one Embodiment of this disclosure. 本開示の一実施形態に係る第１のウェッジプリズムの側面図である。It is a side view of the 1st wedge prism which concerns on one Embodiment of this disclosure. 本開示の一実施形態に係る表示光の照射中心位置が移動可能な移動可能範囲を示す図である。It is a figure which shows the movable range which the irradiation center position of the display light which concerns on one Embodiment of this disclosure can move. 本開示の一実施形態に係る照射中心位置を視点に合わせる際の照射中心位置の移動態様を示す図である。It is a figure which shows the movement mode of the irradiation center position at the time of adjusting the irradiation center position which concerns on one Embodiment of this disclosure to a viewpoint. 本開示の変形例に係る３つのウェッジプリズムが設けられた場合の移動可能範囲を示す図である。It is a figure which shows the movable range when the three wedge prisms which concerns on the modification of this disclosure are provided. 比較例に係る表示光の照射中心位置が移動可能な移動可能範囲を示す図である。It is a figure which shows the movable range which the irradiation center position of the display light which concerns on a comparative example can move.
　本開示に係るヘッドアップディスプレイ装置の一実施形態について、図面を参照して説明する。以下では、Ｘ方向は車幅方向に沿い、Ｙ方向は車両前後方向に沿い、Ｚ方向は高さ方向に沿う。
　図１に示すように、ヘッドアップディスプレイ装置１００は、車両２００のダッシュボード内に搭載される。ヘッドアップディスプレイ装置１００は、車両２００の被投射部材の一例であるフロントガラス２０１に向けて画像を表す表示光Ｌを出射する。表示光Ｌはフロントガラス２０１で反射して視認者１（主に車両２００の運転者）に到達する。これにより、ヘッドアップディスプレイ装置１００は、視認者１により視認可能に車両情報を含む虚像Ｖを表示する。ヘッドアップディスプレイ装置１００は、表示光Ｌの視認者１に対する照射中心位置Ｐを移動可能範囲Ａｒ内で移動させることにより、照射中心位置Ｐを視認者１の視点に合わせる。表示光Ｌは、照射中心位置Ｐを中心としたアイボックスＥｂ内に照射される。アイボックスＥｂは、Ｘ方向に長く、Ｚ方向に短い長方形形状をなす。 An embodiment of the head-up display device according to the present disclosure will be described with reference to the drawings. In the following, the X direction is along the vehicle width direction, the Y direction is along the vehicle front-rear direction, and the Z direction is along the height direction.
As shown in FIG. 1, the head-up display device 100 is mounted in the dashboard of the vehicle 200. The head-up display device 100 emits display light L representing an image toward the windshield 201, which is an example of the projected member of the vehicle 200. The display light L is reflected by the windshield 201 and reaches the viewer 1 (mainly the driver of the vehicle 200). As a result, the head-up display device 100 displays the virtual image V including the vehicle information so as to be visible to the viewer 1. The head-up display device 100 adjusts the irradiation center position P to the viewpoint of the viewer 1 by moving the irradiation center position P of the display light L with respect to the viewer 1 within the movable range Ar. The display light L is irradiated into the eye box Eb centered on the irradiation center position P. The eyebox Eb has a rectangular shape that is long in the X direction and short in the Z direction.
　図２に示すように、ヘッドアップディスプレイ装置１００は、表示器１０と、反射鏡２０と、凹面鏡３０と、鏡ホルダ２１，３１と、照射位置移動ユニット４０と、筐体６０と、制御部７０と、を備える。 As shown in FIG. 2, the head-up display device 100 includes a display 10, a reflector 20, a concave mirror 30, mirror holders 21 and 31, an irradiation position moving unit 40, a housing 60, and a control unit 70. And.
　表示器１０は、制御部７０による制御のもと、像を表す表示光Ｌを出射する。表示器１０は、例えば、光源により照明されるＴＦＴ（Thin Film Transistor）型の液晶表示パネルから構成されてもよいし、有機ＥＬディスプレイ（ＯＥＬＤ：Organic Electro-Luminescence Display）から構成されてもよい。 The display 10 emits a display light L representing an image under the control of the control unit 70. The display 10 may be composed of, for example, a TFT (Thin Film Transistor) type liquid crystal display panel illuminated by a light source, or may be composed of an organic EL display (OELD: Organic Electro-Luminescence Display).
　反射鏡２０は、表示器１０からの表示光Ｌを凹面鏡３０に向けて反射させる平面鏡である。鏡ホルダ２１は、反射鏡２０の背面から反射鏡２０を支持し、筐体６０の光路空間Ｓｃ内に固定される。
　凹面鏡３０は、反射鏡２０で反射した表示光Ｌをフロントガラス２０１に向けて拡大させつつ反射させる。鏡ホルダ３１は、凹面鏡３０の背面から凹面鏡３０を支持し、筐体６０の光路空間Ｓｃ内に固定される。 The reflecting mirror 20 is a plane mirror that reflects the display light L from the display 10 toward the concave mirror 30. The mirror holder 21 supports the reflector 20 from the back surface of the reflector 20 and is fixed in the optical path space Sc of the housing 60.
The concave mirror 30 reflects the display light L reflected by the reflector 20 while enlarging it toward the windshield 201. The mirror holder 31 supports the concave mirror 30 from the back surface of the concave mirror 30 and is fixed in the optical path space Sc of the housing 60.
　図２に示すように、筐体６０は、非透光性の樹脂又は金属で箱状に形成され、内部に表示光Ｌが通過する光路空間Ｓｃを有する。筐体６０には、ヘッドアップディスプレイ装置１００の各構成が収納されている。筐体６０には、フロントガラス２０１（図１参照）に対向する位置に開口部６１が形成されている。筐体６０は、開口部６１を塞ぐ湾曲板状の窓板材５０を備える。窓板材５０は、表示光Ｌが透過するアクリル等の透光性の樹脂からなる。 As shown in FIG. 2, the housing 60 is made of a non-transmissive resin or metal in a box shape, and has an optical path space Sc through which the display light L passes. Each configuration of the head-up display device 100 is housed in the housing 60. The housing 60 is formed with an opening 61 at a position facing the windshield 201 (see FIG. 1). The housing 60 includes a curved plate-shaped window plate material 50 that closes the opening 61. The window plate material 50 is made of a translucent resin such as acrylic through which the display light L is transmitted.
　照射位置移動ユニット４０は、第１のウェッジプリズム４１と、第２のウェッジプリズム４２と、第１のウェッジプリズム４１を回転させる第１の駆動部４３と、第２のウェッジプリズム４２を回転させる第２の駆動部４４と、第１及び第２のウェッジプリズム４１，４２を保持するプリズムホルダ４５，４６と、第１及び第２のウェッジプリズム４１，４２及びプリズムホルダ４５，４６を収容する収容ケース４７と、を備える。 The irradiation position moving unit 40 has a first wedge prism 41, a second wedge prism 42, a first drive unit 43 for rotating the first wedge prism 41, and a second wedge prism 42 for rotating the first wedge prism 41. A storage case for accommodating the drive unit 44 of 2, the prism holders 45 and 46 for holding the first and second wedge prisms 41 and 42, and the first and second wedge prisms 41 and 42 and the prism holders 45 and 46. 47 and.
　図３に示すように、第１及び第２のウェッジプリズム４１，４２は、表示光Ｌの光軸方向ＪＬに沿って並べられる。第１及び第２のウェッジプリズム４１，４２は、それぞれの厚さ方向が表示光Ｌの光軸方向ＪＬに沿うように配置される。第２のウェッジプリズム４２は、表示光Ｌの光路において第１のウェッジプリズム４１よりも凹面鏡３０に近い位置に設けられる。 As shown in FIG. 3, the first and second wedge prisms 41 and 42 are arranged along the optical axis direction JL of the display light L. The first and second wedge prisms 41 and 42 are arranged so that their respective thickness directions are along the optical axis direction JL of the display light L. The second wedge prism 42 is provided at a position closer to the concave mirror 30 than the first wedge prism 41 in the optical path of the display light L.
　第１及び第２のウェッジプリズム４１，４２は、それぞれ透過性部材により、出射面が傾斜した円板状をなす。
　詳しくは、図５に示すように、第１のウェッジプリズム４１は、表示光Ｌが入射する入射面４１ａと、表示光Ｌを出射する出射面４１ｂと、を備える。入射面４１ａは回転軸Ａｘ１に直交する方向に延びる。出射面４１ｂは入射面４１ａに対して傾斜した方向に延びる。第１のウェッジプリズム４１は、入射した第２のウェッジプリズム４２を透過した表示光Ｌを、第１のウェッジプリズム４１の厚さが厚い方向に屈折させたうえでフロントガラス２０１に向けて出射する。 The first and second wedge prisms 41 and 42 each have a disc shape with an inclined exit surface due to a transmissive member.
Specifically, as shown in FIG. 5, the first wedge prism 41 includes an incident surface 41a on which the display light L is incident and an exit surface 41b that emits the display light L. The incident surface 41a extends in a direction orthogonal to the rotation axis Ax1. The exit surface 41b extends in a direction inclined with respect to the incident surface 41a. The first wedge prism 41 emits the display light L transmitted through the incident second wedge prism 42 toward the windshield 201 after refracting the display light L transmitted in the direction in which the thickness of the first wedge prism 41 is thicker. ..
　図４に示すように、第２のウェッジプリズム４２は、表示光Ｌが入射する入射面４２ａと、表示光Ｌを出射する出射面４２ｂと、を備える。入射面４２ａは回転軸Ａｘ２に直交する方向に延びる。出射面４２ｂは入射面４２ａに対して傾斜した方向に延びる。第２のウェッジプリズム４２は、入射した凹面鏡３０を反射した表示光Ｌを、第２のウェッジプリズム４２の厚さが厚い方向に屈折させたうえで第１のウェッジプリズム４１に向けて出射する。第２のウェッジプリズム４２の厚さは、第１のウェッジプリズム４１の厚さよりも薄く形成されている。 As shown in FIG. 4, the second wedge prism 42 includes an incident surface 42a on which the display light L is incident and an exit surface 42b that emits the display light L. The incident surface 42a extends in a direction orthogonal to the rotation axis Ax2. The exit surface 42b extends in a direction inclined with respect to the incident surface 42a. The second wedge prism 42 refracts the display light L reflected from the incident concave mirror 30 in the direction in which the thickness of the second wedge prism 42 is thicker, and then emits the display light L toward the first wedge prism 41. The thickness of the second wedge prism 42 is formed to be thinner than the thickness of the first wedge prism 41.
　第１のウェッジプリズム４１のウェッジ角α１は、第２のウェッジプリズム４２のウェッジ角α２以上の角度で形成されている。ウェッジ角α１，α２は、入射面４１ａ，４２ａに対して出射面４１ｂ，４２ｂがなす角度である。ウェッジ角α２は後述する図６に示す可動回転中心Ｆ２の回転半径Ｒ１に対応した値となり、ウェッジ角α１は後述する図６に示す照射中心位置Ｐの回転半径Ｒ２に対応した値となる。ウェッジ角α１がウェッジ角α２以上の角度に設定されることにより、回転半径Ｒ１が回転半径Ｒ２以下に設定される。 The wedge angle α1 of the first wedge prism 41 is formed at an angle equal to or greater than the wedge angle α2 of the second wedge prism 42. The wedge angles α1 and α2 are angles formed by the exit surfaces 41b and 42b with respect to the incident surfaces 41a and 42a. The wedge angle α2 is a value corresponding to the turning radius R1 of the movable rotation center F2 shown in FIG. 6 described later, and the wedge angle α1 is a value corresponding to the turning radius R2 of the irradiation center position P shown in FIG. 6 described later. By setting the wedge angle α1 to an angle equal to or greater than the wedge angle α2, the turning radius R1 is set to the turning radius R2 or less.
　図２に示すように、プリズムホルダ４５は、第１のウェッジプリズム４１の周囲を囲み、第１のウェッジプリズム４１を保持する。同様に、プリズムホルダ４６は、第２のウェッジプリズム４２の周囲を囲み、第２のウェッジプリズム４２を保持する。
　収容ケース４７は、光軸方向ＪＬに貫通した筒状をなす。収容ケース４７内にはプリズムホルダ４５，４６が回転可能に収容される。収容ケース４７は筐体６０の光路空間Ｓｃ内に固定される。 As shown in FIG. 2, the prism holder 45 surrounds the first wedge prism 41 and holds the first wedge prism 41. Similarly, the prism holder 46 surrounds the second wedge prism 42 and holds the second wedge prism 42.
The storage case 47 has a cylindrical shape penetrating in the optical axis direction JL. The prism holders 45 and 46 are rotatably housed in the storage case 47. The storage case 47 is fixed in the optical path space Sc of the housing 60.
　第１の駆動部４３は、制御部７０による制御のもと、光軸方向ＪＬに沿う回転軸Ａｘ１（図５参照）を中心に第１のウェッジプリズム４１を回転させる。この回転軸Ａｘ１は、第１のウェッジプリズム４１の中心を通る。第１の駆動部４３は、例えば、制御部７０により駆動されるモータ４３ａと、モータ４３ａの回転力をプリズムホルダ４５に伝える伝達機構４３ｂと、を備える。伝達機構４３ｂは、例えば、第１のウェッジプリズム４１が保持されるプリズムホルダ４５の外周面に噛み合う歯車である。 The first drive unit 43 rotates the first wedge prism 41 around the rotation axis Ax1 (see FIG. 5) along the optical axis direction JL under the control of the control unit 70. The rotation axis Ax1 passes through the center of the first wedge prism 41. The first drive unit 43 includes, for example, a motor 43a driven by the control unit 70 and a transmission mechanism 43b that transmits the rotational force of the motor 43a to the prism holder 45. The transmission mechanism 43b is, for example, a gear that meshes with the outer peripheral surface of the prism holder 45 in which the first wedge prism 41 is held.
　第２の駆動部４４は、制御部７０による制御のもと、光軸方向ＪＬに沿う回転軸Ａｘ２（図４参照）を中心に第２のウェッジプリズム４２を回転させる。この回転軸Ａｘ２は、第２のウェッジプリズム４２の中心を通る。第２の駆動部４４は、第１の駆動部４３と同様に、モータ４４ａ及び伝達機構４４ｂを備える。 The second drive unit 44 rotates the second wedge prism 42 around the rotation axis Ax2 (see FIG. 4) along the optical axis direction JL under the control of the control unit 70. The rotation axis Ax2 passes through the center of the second wedge prism 42. The second drive unit 44 includes a motor 44a and a transmission mechanism 44b, similarly to the first drive unit 43.
　制御部７０は、表示器１０、第１の駆動部４３、第２の駆動部４４を制御する。制御部７０は、ＣＰＵ（Central Processing Unit）、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）等から構成されるマイクロコンピュータである。 The control unit 70 controls the display 10, the first drive unit 43, and the second drive unit 44. The control unit 70 is a microcomputer composed of a CPU (Central Processing Unit), a ROM (ReadOnlyMemory), a RAM (RandomAccessMemory), and the like.
　制御部７０は、表示器１０を通じて表示光Ｌを出射する。
　また、制御部７０は、視認者１の視点の位置情報を示す視点情報Ｉｅを取得し、取得した視点情報Ｉｅに基づき第１及び第２の駆動部４３，４４を通じて第１及び第２のウェッジプリズム４１，４２を回転させることにより表示光Ｌの照射中心位置Ｐを視点情報Ｉｅが示す視点に合わせる。表示光Ｌは表示光Ｌの光軸に直交する方向から切断すると車幅方向に長い長方形形状をなす。照射中心位置Ｐは、この長方形形状の中央に位置する。例えば、制御部７０は、照射中心位置Ｐを視認者１の両眼の中心に合わせる。これにより、表示光Ｌの照射中心位置Ｐを視認者１の視点に合わせることができ、視認者１の視点に関わらず適切に虚像Ｖを視認者１に視認させることができる。
　視点情報Ｉｅは、例えば、カメラにより撮像された視認者１の顔の画像情報に基づき視認者１の視点が推定された情報である。なお、制御部７０が視認者１の顔の画像情報を視点情報Ｉｅとして取得し、取得した視点情報Ｉｅに基づき視認者１の視点を推定してもよい。 The control unit 70 emits the display light L through the display 10.
Further, the control unit 70 acquires the viewpoint information Ie indicating the position information of the viewpoint of the viewer 1, and based on the acquired viewpoint information Ie, the first and second wedges are passed through the first and second drive units 43 and 44. By rotating the prisms 41 and 42, the irradiation center position P of the display light L is adjusted to the viewpoint indicated by the viewpoint information IE. The display light L forms a long rectangular shape in the vehicle width direction when cut from the direction orthogonal to the optical axis of the display light L. The irradiation center position P is located at the center of this rectangular shape. For example, the control unit 70 aligns the irradiation center position P with the center of both eyes of the viewer 1. As a result, the irradiation center position P of the display light L can be aligned with the viewpoint of the viewer 1, and the virtual image V can be appropriately visually recognized by the viewer 1 regardless of the viewpoint of the viewer 1.
The viewpoint information IE is, for example, information in which the viewpoint of the viewer 1 is estimated based on the image information of the face of the viewer 1 captured by the camera. The control unit 70 may acquire the image information of the face of the viewer 1 as the viewpoint information IE, and estimate the viewpoint of the viewer 1 based on the acquired viewpoint information IE.
　次に、第１及び第２のウェッジプリズム４１，４２それぞれの回転に伴う照射中心位置Ｐの移動態様について説明する。
　第２のウェッジプリズム４２が回転すると、図６に示すように、可動回転中心Ｆ２は、固定回転中心Ｆ１を中心とした円周Ｃ１に沿って回転する。視認者１から見て、第２のウェッジプリズム４２の回転方向と可動回転中心Ｆ２の回転方向は同一方向となる。第２のウェッジプリズム４２の回転角度は、固定回転中心Ｆ１を中心とした可動回転中心Ｆ２の回転角度に対応している。例えば、第２のウェッジプリズム４２を１°回転させると、可動回転中心Ｆ２が円周Ｃ１に沿って１°回転する。 Next, the movement mode of the irradiation center position P accompanying the rotation of each of the first and second wedge prisms 41 and 42 will be described.
When the second wedge prism 42 rotates, as shown in FIG. 6, the movable rotation center F2 rotates along the circumference C1 about the fixed rotation center F1. Seen from the viewer 1, the rotation direction of the second wedge prism 42 and the rotation direction of the movable rotation center F2 are the same. The rotation angle of the second wedge prism 42 corresponds to the rotation angle of the movable rotation center F2 centered on the fixed rotation center F1. For example, when the second wedge prism 42 is rotated by 1 °, the movable rotation center F2 rotates by 1 ° along the circumference C1.
　第１のウェッジプリズム４１が回転すると、照射中心位置Ｐは、可動回転中心Ｆ２を中心とした円周Ｃ２に沿って回転する。視認者１から見て、第１のウェッジプリズム４１の回転方向と照射中心位置Ｐの回転方向は同一方向となる。第１のウェッジプリズム４１の回転角度は、円周Ｃ２に沿う照射中心位置Ｐの回転角度に対応している。例えば、第１のウェッジプリズム４１を１°回転させると、照射中心位置Ｐが円周Ｃ２に沿って１°回転する。 When the first wedge prism 41 rotates, the irradiation center position P rotates along the circumference C2 centered on the movable rotation center F2. Seen from the viewer 1, the rotation direction of the first wedge prism 41 and the rotation direction of the irradiation center position P are the same. The rotation angle of the first wedge prism 41 corresponds to the rotation angle of the irradiation center position P along the circumference C2. For example, when the first wedge prism 41 is rotated by 1 °, the irradiation center position P is rotated by 1 ° along the circumference C2.
　可動回転中心Ｆ２が円周Ｃ１に沿って移動可能であり、かつ、この可動回転中心Ｆ２を中心として照射中心位置Ｐが円周Ｃ２に沿って移動可能に構成される。このため、照射中心位置Ｐが移動可能範囲Ａｒ内で移動可能となる。移動可能範囲Ａｒは、円周Ｃ１の回転半径Ｒ１と円周Ｃ２の回転半径Ｒ２を足し合わせた値の半径Ｒｒを有する円形をなす。
　なお、円周Ｃ１，Ｃ２は真円及び楕円の何れであってもよい。
　ウェッジ角α１がウェッジ角α２以上の角度に設定されることにより、円周Ｃ２の回転半径Ｒ２が円周Ｃ１の回転半径Ｒ１以上に設定される。これにより、円形の移動可能範囲Ａｒの全域にわたって照射中心位置Ｐが移動可能となる。図９の比較例で示すように、回転半径Ｒ２が回転半径Ｒ１よりも小さく設定される場合、移動可能範囲Ａｒが固定回転中心Ｆ１を中心とした円環状をなし、移動可能範囲Ａｒの中央部に照射中心位置Ｐが移動不能な不到達領域Ａｄが形成される。 The movable rotation center F2 is movable along the circumference C1, and the irradiation center position P is configured to be movable along the circumference C2 with the movable rotation center F2 as the center. Therefore, the irradiation center position P can be moved within the movable range Ar. The movable range Ar forms a circle having a radius Rr of the value obtained by adding the radius of gyration R1 of the circumference C1 and the radius of gyration R2 of the circumference C2.
The circumferences C1 and C2 may be either a perfect circle or an ellipse.
By setting the wedge angle α1 to an angle equal to or greater than the wedge angle α2, the turning radius R2 of the circumference C2 is set to be equal to or higher than the turning radius R1 of the circumference C1. As a result, the irradiation center position P can be moved over the entire range of the circular movable range Ar. As shown in the comparative example of FIG. 9, when the turning radius R2 is set smaller than the turning radius R1, the movable range Ar forms an annular shape centered on the fixed rotation center F1, and the central portion of the movable range Ar. An unreachable region Ad in which the irradiation center position P cannot move is formed.
　次に、制御部７０による照射中心位置Ｐを視認者１の視点に合わせるための処理について説明する。以下では、図７を参照しつつ、照射中心位置Ｐを移動可能範囲Ａｒ内における視点Ｅｐに合わせる場合について説明する。この処理の開始時には照射中心位置Ｐが第１位置Ｐａに位置する。
　制御部７０は、第２の駆動部４４を通じて第２のウェッジプリズム４２を回転させることにより、図７の矢印Ｙｊ１に示すように、視点Ｅｐに接するように円周Ｃ２を可動回転中心Ｆ２とともに移動させる。図７の破線で示す円周Ｃ２は移動前であり、図７の一点鎖線で示す円周Ｃ２は移動後である。これにより、照射中心位置Ｐが第１位置Ｐａから第２位置Ｐｂに移動する。
　また、制御部７０は、第１の駆動部４３を通じて第１のウェッジプリズム４１を回転させることにより、図７の矢印Ｙｊ２に示すように、円周Ｃ２に沿って照射中心位置Ｐを視点Ｅｐに近づくように移動させる。これにより、照射中心位置Ｐが第２位置Ｐｂから視点Ｅｐに一致する第３位置Ｐｃまで移動する。
　なお、制御部７０は、第１及び第２のウェッジプリズム４１，４２を同時に回転させてもよいし、順番に回転させてもよい。 Next, a process for adjusting the irradiation center position P by the control unit 70 to the viewpoint of the viewer 1 will be described. Hereinafter, a case where the irradiation center position P is aligned with the viewpoint Ep in the movable range Ar will be described with reference to FIG. 7. At the start of this process, the irradiation center position P is located at the first position Pa.
The control unit 70 moves the circumference C2 together with the movable rotation center F2 so as to be in contact with the viewpoint Ep as shown by the arrow Yj1 in FIG. 7 by rotating the second wedge prism 42 through the second drive unit 44. Let me. The circumference C2 shown by the broken line in FIG. 7 is before the movement, and the circumference C2 shown by the alternate long and short dash line in FIG. 7 is after the movement. As a result, the irradiation center position P moves from the first position Pa to the second position Pb.
Further, the control unit 70 rotates the first wedge prism 41 through the first drive unit 43, so that the irradiation center position P is set to the viewpoint Ep along the circumference C2 as shown by the arrow Yj2 in FIG. Move it closer. As a result, the irradiation center position P moves from the second position Pb to the third position Pc corresponding to the viewpoint Ep.
The control unit 70 may rotate the first and second wedge prisms 41 and 42 at the same time, or may rotate them in order.
　（効果）
　以上、説明した一実施形態によれば、以下の効果を奏する。
　（１）ヘッドアップディスプレイ装置１００は、表示光Ｌを被投射部材の一例であるフロントガラス２０１に投射することにより虚像Ｖを表示する。ヘッドアップディスプレイ装置１００は、表示光Ｌを出射する表示器１０と、表示器１０からフロントガラス２０１までの表示光Ｌの光路に沿って配置され、表示器１０からの表示光Ｌを透過させる第１及び第２のウェッジプリズム４１，４２と、第１及び第２のウェッジプリズム４１，４２それぞれを光路に沿う回転軸Ａｘ１，Ａｘ２を中心に回転させる駆動部の一例である第１及び第２の駆動部４３，４４と、を備える。
　この構成によれば、ヘッドアップディスプレイ装置１００は、第１の駆動部４３を介して第１のウェッジプリズム４１の回転位置を調整し、第２の駆動部４４を介して第２のウェッジプリズム４２の回転位置を調整することにより、視認者１に向けて照射される表示光Ｌの照射中心位置Ｐを視認者１の視点に合うようにＸ方向及びＹ方向に調整可能となる。これにより、虚像Ｖの視認性を高めることができる。
　第１及び第２のウェッジプリズム４１，４２の回転を通じて、照射中心位置Ｐを視認者１の視点に合わせることができるため、表示光Ｌを表示器１０から第１及び第２のウェッジプリズム４１，４２までリレーする反射鏡２０及び凹面鏡３０からなるリレー光学系のサイズを小さくすることができる。特に、上記構成では、特許文献１に記載の構成と異なり、Ｘ方向において照射中心位置Ｐを視認者１の視点に合わせて移動可能であるため、反射鏡２０及び凹面鏡３０のＸ方向の長さを短くすることができる。よって、ヘッドアップディスプレイ装置１００をコンパクトに構成することができる。 (effect)
According to the above-described embodiment, the following effects are obtained.
(1) The head-up display device 100 displays a virtual image V by projecting the display light L onto the windshield 201 which is an example of the projected member. The head-up display device 100 is arranged along the optical path of the display 10 that emits the display light L and the display light L from the display 10 to the windshield 201, and transmits the display light L from the display 10. The first and second wedge prisms 41 and 42, which are examples of the driving unit that rotates the first and second wedge prisms 41 and 42 about the rotation axes Ax1 and Ax2 along the optical path, respectively. The drive units 43 and 44 are provided.
According to this configuration, the head-up display device 100 adjusts the rotational position of the first wedge prism 41 via the first drive unit 43, and the second wedge prism 42 via the second drive unit 44. By adjusting the rotation position of, the irradiation center position P of the display light L emitted toward the viewer 1 can be adjusted in the X direction and the Y direction so as to match the viewpoint of the viewer 1. This makes it possible to improve the visibility of the virtual image V.
Since the irradiation center position P can be adjusted to the viewpoint of the viewer 1 through the rotation of the first and second wedge prisms 41 and 42, the display light L is displayed from the display 10 to the first and second wedge prisms 41, The size of the relay optical system including the reflector 20 and the concave mirror 30 that relay to 42 can be reduced. In particular, in the above configuration, unlike the configuration described in Patent Document 1, since the irradiation center position P can be moved according to the viewpoint of the viewer 1 in the X direction, the lengths of the reflecting mirror 20 and the concave mirror 30 in the X direction. Can be shortened. Therefore, the head-up display device 100 can be compactly configured.
　（２）第２のウェッジプリズム４２は、光路における第１のウェッジプリズム４１よりも表示器１０に近い位置に設けられる。第１のウェッジプリズム４１のウェッジ角α１は、第２のウェッジプリズム４２のウェッジ角α２以上の角度に形成される。
　この構成によれば、ウェッジ角α２は図６に示す可動回転中心Ｆ２の回転半径Ｒ１に対応した値となり、ウェッジ角α１は図６に示す照射中心位置Ｐの回転半径Ｒ２に対応した値となる。仮に、ウェッジ角α１がウェッジ角α２未満の場合には、図９の比較例で示すように、可動回転中心Ｆ２を中心とした円周Ｃ２が固定回転中心Ｆ１に到達できず、照射中心位置Ｐが移動可能な移動可能範囲Ａｒが視認者１から見て円環状となり、移動可能範囲Ａｒの中央に照射中心位置Ｐが到達不能な不到達領域Ａｄが形成される。
　この点、上記構成では、ウェッジ角α１がウェッジ角α２以上の角度であるため、可動回転中心Ｆ２を中心とした円周Ｃ２が固定回転中心Ｆ１に到達可能となり、不到達領域Ａｄが形成されず、移動可能範囲Ａｒを円形に形成することができる。よって、より確実に、照射中心位置Ｐを視認者１の視点に合うように調整可能となり、虚像Ｖの視認性を高めることができる。 (2) The second wedge prism 42 is provided at a position closer to the display 10 than the first wedge prism 41 in the optical path. The wedge angle α1 of the first wedge prism 41 is formed at an angle equal to or larger than the wedge angle α2 of the second wedge prism 42.
According to this configuration, the wedge angle α2 is a value corresponding to the turning radius R1 of the movable rotation center F2 shown in FIG. 6, and the wedge angle α1 is a value corresponding to the turning radius R2 of the irradiation center position P shown in FIG. .. If the wedge angle α1 is less than the wedge angle α2, the circumference C2 centered on the movable rotation center F2 cannot reach the fixed rotation center F1 as shown in the comparative example of FIG. 9, and the irradiation center position P The movable range Ar that can be moved becomes an annular shape when viewed from the viewer 1, and a non-reachable area Ad that the irradiation center position P cannot reach is formed in the center of the movable range Ar.
In this respect, in the above configuration, since the wedge angle α1 is an angle equal to or larger than the wedge angle α2, the circumference C2 centered on the movable rotation center F2 can reach the fixed rotation center F1, and the non-reachable region Ad is not formed. , The movable range Ar can be formed in a circular shape. Therefore, the irradiation center position P can be adjusted more reliably so as to match the viewpoint of the viewer 1, and the visibility of the virtual image V can be improved.
　（３）ヘッドアップディスプレイ装置１００は、表示器１０からの表示光Ｌをフロントガラス２０１に向けて反射させる鏡の一例である凹面鏡３０を備える。第１及び第２のウェッジプリズム４１，４２は、光路において凹面鏡３０とフロントガラス２０１の間に設けられる。
　この構成によれば、表示光Ｌの照射方向を制御する第１及び第２のウェッジプリズム４１，４２が光路における凹面鏡３０の後段に設けられることにより、凹面鏡３０の大型化を抑制でき、ヘッドアップディスプレイ装置１００をコンパクトに構成することができる。
　また、凹面鏡３０は、鏡ホルダ３１を介して筐体６０の光路空間Ｓｃ内に固定されている。よって、凹面鏡３０を回動させる駆動機構が不要となるため、凹面鏡３０の周囲の構成を簡素化することができる。 (3) The head-up display device 100 includes a concave mirror 30 which is an example of a mirror that reflects the display light L from the display device 10 toward the windshield 201. The first and second wedge prisms 41 and 42 are provided between the concave mirror 30 and the windshield 201 in the optical path.
According to this configuration, the first and second wedge prisms 41 and 42 for controlling the irradiation direction of the display light L are provided after the concave mirror 30 in the optical path, so that the size of the concave mirror 30 can be suppressed and the head-up can be achieved. The display device 100 can be compactly configured.
Further, the concave mirror 30 is fixed in the optical path space Sc of the housing 60 via the mirror holder 31. Therefore, since the drive mechanism for rotating the concave mirror 30 is not required, the configuration around the concave mirror 30 can be simplified.
　（４）ヘッドアップディスプレイ装置１００は、第２の駆動部４４を通じて第２のウェッジプリズム４２を回転させることにより、固定回転中心Ｆ１を中心に可動回転中心Ｆ２を円周Ｃ１に沿って回転させ、第１の駆動部４３を通じて第１のウェッジプリズム４１を回転させることにより、表示光Ｌの光軸中心に位置する照射中心位置Ｐを可動回転中心Ｆ２を中心に円周Ｃ２に沿って回転させる制御部７０を備える。
　この構成によれば、制御部７０は、円周Ｃ１の回転半径Ｒ１と円周Ｃ２の回転半径Ｒ２を足し合わせた半径Ｒｒを有する移動可能範囲Ａｒ内で照射中心位置Ｐを移動制御可能となる。よって、より確実に、照射中心位置Ｐを視認者１の視点に合うように調整可能となり、虚像Ｖの視認性を高めることができる。 (4) The head-up display device 100 rotates the second wedge prism 42 through the second drive unit 44 to rotate the movable rotation center F2 around the fixed rotation center F1 along the circumference C1. Control to rotate the irradiation center position P located at the center of the optical axis of the display light L along the circumference C2 around the movable rotation center F2 by rotating the first wedge prism 41 through the first drive unit 43. A unit 70 is provided.
According to this configuration, the control unit 70 can move and control the irradiation center position P within the movable range Ar having a radius Rr obtained by adding the turning radius R1 of the circumference C1 and the turning radius R2 of the circumference C2. .. Therefore, the irradiation center position P can be adjusted more reliably so as to match the viewpoint of the viewer 1, and the visibility of the virtual image V can be improved.
　なお、本開示は以上の実施形態及び図面によって限定されるものではない。本開示の要旨を変更しない範囲で、適宜、変更（構成要素の削除も含む）を加えることが可能である。以下に、変形の一例を説明する。 Note that this disclosure is not limited to the above embodiments and drawings. Changes (including deletion of components) may be made as appropriate without changing the gist of the present disclosure. An example of the modification will be described below.
　（変形例）
　上記実施形態においては、ヘッドアップディスプレイ装置１００は、第１及び第２のウェッジプリズム４１，４２を備えていたが、ウェッジプリズムの数は２つに限らず、３つ以上であってもよい。ウェッジプリズムの数を多くすることにより、ウェッジ角を小さく保ちつつ、移動可能範囲Ａｒの面積を大きくすることができる。ウェッジ角が小さくなることにより、ウェッジプリズムを薄くすることができ、よりコンパクトに構成することができる。
　例えば、第１及び第２のウェッジプリズム４１，４２に加えて、第３のウェッジプリズムを設けた場合には、第３のウェッジプリズムを回転させることにより、図８に示すように、照射中心位置Ｐが円周Ｃ２上に位置する可動回転中心Ｆ３を中心に円周Ｃ３に沿って回転する。この変形例では、第１のウェッジプリズム４１のウェッジ角α１は、第２のウェッジプリズム４２のウェッジ角α２未満の角度で形成されてもよい。 (Modification example)
In the above embodiment, the head-up display device 100 includes the first and second wedge prisms 41 and 42, but the number of wedge prisms is not limited to two and may be three or more. By increasing the number of wedge prisms, it is possible to increase the area of the movable range Ar while keeping the wedge angle small. By reducing the wedge angle, the wedge prism can be made thinner and can be configured more compactly.
For example, when a third wedge prism is provided in addition to the first and second wedge prisms 41 and 42, the irradiation center position is as shown in FIG. 8 by rotating the third wedge prism. P rotates along the circumference C3 around the movable rotation center F3 located on the circumference C2. In this modification, the wedge angle α1 of the first wedge prism 41 may be formed at an angle smaller than the wedge angle α2 of the second wedge prism 42.
　上記実施形態における反射鏡２０は、平面鏡に限らず、凹面鏡であってもよい。
　また、反射鏡２０は省略され、表示器１０からの表示光Ｌが凹面鏡３０に直接に照射されてもよい。さらに、凹面鏡３０が省略され、表示器１０からの表示光Ｌが第１及び第２のウェッジプリズム４１，４２に直接に照射されてもよい。 The reflecting mirror 20 in the above embodiment is not limited to a plane mirror, and may be a concave mirror.
Further, the reflecting mirror 20 may be omitted, and the display light L from the display 10 may be directly applied to the concave mirror 30. Further, the concave mirror 30 may be omitted, and the display light L from the display 10 may be directly applied to the first and second wedge prisms 41 and 42.
　上記実施形態においては、ヘッドアップディスプレイ装置１００は車両２００に搭載されていたが、車両２００以外の飛行機、船等の乗り物に搭載されていてもよい。また、被投射部材はフロントガラスに限らず、専用のコンバイナであってもよい。 In the above embodiment, the head-up display device 100 is mounted on the vehicle 200, but it may be mounted on a vehicle such as an airplane or a ship other than the vehicle 200. Further, the projected member is not limited to the windshield, and may be a dedicated combiner.
　上記実施形態において、制御部７０は、視認者１によるスイッチ操作に応じて、照射中心位置Ｐを移動させてもよい。 In the above embodiment, the control unit 70 may move the irradiation center position P in response to a switch operation by the viewer 1.
１　視認者
１０　表示器
２０　反射鏡
２１，３１　鏡ホルダ
３０　凹面鏡
４０　照射位置移動ユニット
４１　第１のウェッジプリズム
４２　第２のウェッジプリズム
４１ａ，４２ａ　入射面
４１ｂ，４２ｂ　出射面
４３　第１の駆動部
４３ａ，４４ａ　モータ
４３ｂ，４４ｂ　伝達機構
４４　第２の駆動部
４５，４６　プリズムホルダ
４７　収容ケース
５０　窓板材
６０　筐体
６１　開口部
７０　制御部
１００　ヘッドアップディスプレイ装置
２００　車両
２０１　フロントガラス 1 Viewer 10 Display 20 Reflector 21, 31 Mirror holder 30 Concave mirror 40 Irradiation position movement unit 41 First wedge prism 42 Second wedge prism 41a, 42a Incident surface 41b, 42b Emission surface 43 First drive unit 43a , 44a Motor 43b, 44b Transmission mechanism 44 Second drive unit 45, 46 Prism holder 47 Storage case 50 Window plate material 60 Housing 61 Opening 70 Control unit 100 Head-up display device 200 Vehicle 201 Front glass

Claims (4)

  1. 　表示光を被投射部材に投射することにより虚像を表示するヘッドアップディスプレイ装置であって、
    　前記表示光を出射する表示器と、
    　前記表示器から前記被投射部材までの前記表示光の光路に沿って配置され、前記表示器からの前記表示光を透過させる第１及び第２のウェッジプリズムと、
    　前記第１及び第２のウェッジプリズムそれぞれを前記光路に沿う回転軸を中心に回転させる駆動部と、を備える、
    　ヘッドアップディスプレイ装置。     A head-up display device that displays a virtual image by projecting display light onto a projected member.
    A display that emits the display light and
    The first and second wedge prisms arranged along the optical path of the display light from the display to the projected member and transmitting the display light from the display, and
    A drive unit for rotating each of the first and second wedge prisms about a rotation axis along the optical path is provided.
    Head-up display device.
  2. 　前記第２のウェッジプリズムは、前記光路における前記第１のウェッジプリズムよりも前記表示器に近い位置に設けられ、
    　前記第１のウェッジプリズムのウェッジ角は、前記第２のウェッジプリズムのウェッジ角以上の角度に形成される、
    　請求項１に記載のヘッドアップディスプレイ装置。     The second wedge prism is provided at a position closer to the display than the first wedge prism in the optical path.
    The wedge angle of the first wedge prism is formed at an angle equal to or larger than the wedge angle of the second wedge prism.
    The head-up display device according to claim 1.
  3. 　前記表示器からの前記表示光を前記被投射部材に向けて反射させる鏡を備え、
    　前記第１及び第２のウェッジプリズムは、前記光路において前記鏡と前記被投射部材の間に設けられる、
    　請求項２に記載のヘッドアップディスプレイ装置。     A mirror that reflects the display light from the display toward the projected member is provided.
    The first and second wedge prisms are provided between the mirror and the projected member in the optical path.
    The head-up display device according to claim 2.
  4. 　前記駆動部を通じて前記第２のウェッジプリズムを回転させることにより、固定回転中心を中心に可動回転中心を回転させ、前記駆動部を通じて前記第１のウェッジプリズムを回転させることにより、前記表示光の光軸中心に位置する照射中心位置を前記可動回転中心を中心に回転させる制御部を備える、
    　請求項１から３の何れか１項に記載のヘッドアップディスプレイ装置。     By rotating the second wedge prism through the drive unit, the movable rotation center is rotated around a fixed rotation center, and by rotating the first wedge prism through the drive unit, the light of the display light is emitted. A control unit for rotating the irradiation center position located at the center of the axis around the movable rotation center is provided.
    The head-up display device according to any one of claims 1 to 3.
PCT/JP2021/022626 2020-06-19 2021-06-15 Head-up display device WO2021256456A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60143312A (en) * 1983-12-29 1985-07-29 Norita Kogaku Kk Projection lens
JPH04352124A (en) * 1991-05-30 1992-12-07 Toshihiro Tsumura Optical axis deflection device for optical equipment
CN102591110A (en) * 2012-03-14 2012-07-18 海信集团有限公司 Vehicle-mounted projecting device and gamma correction method
US20130101276A1 (en) * 2011-10-21 2013-04-25 Raytheon Company Single axis gimbal optical stabilization system
JP2015146012A (en) * 2014-01-06 2015-08-13 株式会社Ｊｖｃケンウッド virtual image display system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60143312A (en) * 1983-12-29 1985-07-29 Norita Kogaku Kk Projection lens
JPH04352124A (en) * 1991-05-30 1992-12-07 Toshihiro Tsumura Optical axis deflection device for optical equipment
US20130101276A1 (en) * 2011-10-21 2013-04-25 Raytheon Company Single axis gimbal optical stabilization system
CN102591110A (en) * 2012-03-14 2012-07-18 海信集团有限公司 Vehicle-mounted projecting device and gamma correction method
JP2015146012A (en) * 2014-01-06 2015-08-13 株式会社Ｊｖｃケンウッド virtual image display system

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