JP2016061978A - Head-up display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head-up display device that can properly adjust an optical axis and can securely turn image light to the device.SOLUTION: A projection device emits projection light showing an image; a transmission type screen 30 emits image light obtained by transmitting and aligning the projection light from the projection device; an optical axis adjustment part 20 adjusts the incident angle of the projection light made incident on the transmission type screen 30; the transmission type screen 30 has in part an alignment angle restriction part 31 that emits projection light having a smaller alignment angle than that of the other area. The alignment angle restriction part 31 emits image light having an alignment angle θs sufficiently smaller than an alignment angle θ1(θ2) of image light emitted from the other area of the transmission type screen 30.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a head-up display device that allows a virtual image to be visually recognized on a real scene.

  For example, as described in Patent Document 1, the head-up display device displays augmented reality (AR: Augmented Reality) in which information is added to a real scene by displaying a virtual image superimposed on the real scene in front of the host vehicle. It is possible to contribute to safe and comfortable vehicle operation by providing desired information accurately to the user while generating and suppressing the movement of the user's line of sight as much as possible.

  In such a head-up display device 500, as shown in FIG. 12, the display unit 501 that emits the image light N, the reflection unit 502 that reflects the image light N from the display unit 501, and the reflection unit 502 are reflected. A concave reflection part 503 that reflects the image light N to the reflection / transmission surface 600.

  The height of the viewpoint of the user who visually recognizes the virtual image displayed by the head-up display device 500 changes depending on the difference in the user who rides on the vehicle and the posture change of the user who rides. In order to cope with such a change in the viewpoint position, the conventional head-up display device needs to widely emit light having a constant luminance in different directions from the display surface 501a of the display 501. Many were wasted and light utilization efficiency was reduced.

JP-T-2004-535971

  However, in order to improve the light use efficiency, the projection device projects the optical axis angle of the projection light on the transmission screen with a reduced orientation angle so that the image light emitted from the transmission screen can be efficiently transmitted. If the light that is not directed toward the user is suppressed toward the user side, when the user adjusts the image light so that it is directed toward himself / herself, it is difficult to know whether the image light is directed toward himself / herself, and as a result, the image is efficiently displayed on himself / herself. There was a problem that the light could not be adjusted.

  Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a head-up display device that can efficiently direct image light to a user.

  In order to achieve the above object, a head-up display device according to the present invention causes a virtual image to be visually recognized by projecting image light onto a reflection / transmission surface, and adjusts the projection position of the image light with respect to the reflection / transmission surface. In the apparatus, a projection apparatus that emits projection light indicating an image, a transmission screen that emits the image light in which the projection light from the projection apparatus is transmitted and oriented, and incidence of the projection light incident on the transmission screen An optical axis adjusting unit that adjusts the angle, and the transmission screen includes an alignment angle limiting unit that emits the image light having a smaller alignment angle than other regions.

  According to the present invention, the user can visually confirm that the image light is directed to the user by visually recognizing the virtual image generated by the image light having a small orientation angle that passes through the orientation angle limiting unit. The user can appropriately adjust the optical axis by the optical axis adjustment unit, and can reliably direct the image light to the user.

1 is a schematic view of a head-up display device according to a first embodiment of the present invention mounted on a vehicle. It is a schematic sectional drawing of the head-up display apparatus in the said embodiment. It is a figure for demonstrating the structure of the projection apparatus and optical axis adjustment part in the said embodiment. It is a figure for demonstrating the optical axis adjustment in the head-up display apparatus in the said embodiment. It is a block diagram which shows the electrical structure of the head-up display apparatus in the said embodiment. (A) shows the virtual image visually recognized by the user when the optical axis adjustment is appropriately performed according to the viewpoint position, and (b) is the optical axis adjustment is not appropriately performed according to the viewpoint position. It is a figure which shows the virtual image which a user visually recognizes in case, (c) is a top view of a transmissive screen. It is a figure for demonstrating the effect | action of the transmissive screen in the said embodiment. It is a figure for demonstrating the effect | action of the transmission type screen toward the high gaze position in the said embodiment. It is a figure for demonstrating the relationship between the position of the orientation angle restriction | limiting part in the said embodiment, and an optical axis adjustment. It is a figure for demonstrating the relationship between the position of the orientation angle restriction | limiting part in a modification, and an optical axis adjustment. (A) is a figure for demonstrating the effect | action of the transmissive | pervious screen in a modification, (b) is a figure for demonstrating the effect | action of the transmissive | pervious screen at the time of aiming at a high gaze position. It is a schematic sectional drawing for demonstrating the head-up display apparatus in a prior art example.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an outline of a head-up display device (hereinafter referred to as a HUD device) 1 according to the present embodiment. The HUD device 1 according to the present embodiment is installed in the dashboard of the vehicle 2. The HUD device 1 emits the image light 100 to the windshield 2 a of the vehicle 2. The image light 100 reflected by the windshield 2a is directed to an orientation area 400 described later. When the user's viewpoint position 3 is in the orientation area 400, the user visually recognizes the virtual image V having a desired luminance generated by the image light 100. The user recognizes that the virtual image V is far away through the windshield 2a so as to overlap the real scene in front of the vehicle 2.

The configuration of the HUD device 1 will be described below with reference to FIG. FIG. 2 is a schematic cross-sectional view showing the configuration of the HUD device 1.
As shown in FIG. 2, the HUD device 1 includes a projection device 10, an optical axis adjustment unit 20, a transmission screen 30, a folding mirror 40, a concave mirror 50, a housing 60 that stores these, a HUD, And a control unit 70 that performs electrical control of the device 1. In FIG. 2, the image light 100 emitted from the HUD device 1 is projected onto the projection point P of the windshield 2a and reflected by the windshield 2a, thereby allowing the user to visually recognize the virtual image V. For example, the virtual image V is displayed so as to be superimposed on the line-of-sight direction M in which the user visually recognizes the predetermined object W in the real scene.

(Projector 10)
With reference to FIG. 3, the structure of the projection apparatus 10 and the optical axis adjustment part 20 is demonstrated. FIG. 3 is a diagram for explaining a specific configuration of the projection device 10 and the optical axis adjustment unit 20 and an optical path of the projection light 200.
As shown in FIG. 3, the projection device 10 includes a light source 11 that emits illumination light 300, a light source mirror 12, a prism 13, a reflective display 14, and a projection lens 15, and generates a virtual image V. Projection light 200 is emitted toward the optical axis adjustment unit 20.

  The light source 11 includes, for example, a plurality of LEDs that can output red, blue, and green light, respectively, and controls the illumination light 300 with a desired color, light intensity, and timing under the control of the control unit 70 described later. Exit. Further, the projection apparatus 10 according to the present embodiment employs a field sequential color driving method, and the light source 11 of each color emits the illumination light 300 in a time division manner.

  The light source mirror 12 is formed by forming a reflective film on the surface of a base material made of, for example, a synthetic resin material or a glass material by means such as vapor deposition, and the illumination light 300 from the light source 11 is reflected to the reflective display 14. It is incident at an appropriate angle.

  The prism 13 is disposed between the light source mirror 12 and the reflective display 14, and has an inclined surface 13a that is inclined at a predetermined angle with respect to the optical axis of the illumination light 300 incident from the light source mirror 12. The illumination light 300 from the light source mirror 12 incident on the inclined surface 13a is transmitted through the inclined surface 13a, incident on the reflective display 14, and the projection light 200 emitted from the reflective display 14 is again the prism 13. And is reflected toward the projection lens 15 by the inclined surface 13a.

  The reflective display 14 is a reflective display device such as DMD (Digital Micromirror Device) or LCOS (Registered Trademark: Liquid Crystal On Silicon), for example, and controls the illumination light 300 incident from the prism 13 as described later. Under the control of 70, the light is converted into projection light 200 for displaying the virtual image V and reflected toward the prism 13.

  The projection lens 15 is formed of, for example, a convex lens, and expands the projection light 200 incident from the prism 13 and emits the projection light 200 in the direction of the optical axis adjustment unit 20.

  The optical axis adjustment unit 20 receives the projection light 200 emitted from the projection device 10, adjusts the optical axis of the projection light 200, and projects it onto the transmission screen 30. The first reflection unit 21 that receives and reflects the projection light 200 and the second reflection unit 22 that reflects the projection light 200 reflected by the first reflection unit 21 toward the transmissive screen 30 are provided.

  For example, the first reflecting portion 21 is formed by forming a reflecting film on the surface of a base material made of a synthetic resin material by means of vapor deposition or the like, and the projection light 200 emitted from the projection device 10 is a second reflection described later. The light is reflected toward the portion 22. Further, the first reflecting unit 21 includes a rotating first actuator 21 a under the control of the control unit 70, and can change the reflection direction of the projection light 200.

  The first actuator 21a is composed of, for example, a stepping motor, and a gear is provided on the rotation shaft thereof. The first actuator 21 a is disposed in the housing 60, and the gear is meshed with the gear of the first reflecting portion 21. Thereby, with the rotational drive of the first actuator 21a, the inclination angle of the first reflecting portion 21 is adjusted, and the reflection direction of the projection light 200 can be adjusted.

  Similar to the first reflecting portion 21, the second reflecting portion 22 is formed by, for example, forming a reflecting film on the surface of a base material made of a synthetic resin material by means such as vapor deposition, and the first reflecting portion 21 is reflected. The projection light 200 is reflected toward a transmissive screen 30 described later. The second reflecting unit 22 includes a rotating second actuator 22 a under the control of the control unit 70, and can change the reflection direction of the projection light 200.

  Like the first actuator 21a, the second actuator 22a is made of, for example, a stepping motor, and a gear is provided on the rotation shaft thereof. The second actuator 22 a is disposed in the housing 60, and the gear is meshed with the gear of the second reflecting portion 22. Thereby, with the rotational drive of the second actuator 22a, the inclination angle of the second reflecting portion 22 is adjusted, and the reflection direction of the projection light 200 can be adjusted.

  That is, the optical axis adjustment unit 20 adjusts the incident angle of the optical axis of the projection light 200 incident on the transmission screen 30 by adjusting the angles of the first reflection unit 21 and the second reflection unit 22 in conjunction with each other. can do. The operation when the incident angle of the optical axis of the projection light 200 incident on the transmission screen 30 is varied will be described with reference to FIG. FIG. 4 is a diagram showing a state of the HUD device 1 when the incident angle of the optical axis of the projection light 200 incident on the transmissive screen 30 is changed. FIG. 4A shows the high viewpoint position 3a. FIG. 4B is a diagram showing a state in the case of matching with the lower viewpoint position 3b.

  FIG. 4A shows a case where the viewpoint position 3 of the user is at a high position (reference numeral 3a). At this time, the user controls the first actuator 21a and the second actuator 22a by operating an operation unit 90 described later. In this case, the first reflecting portion 21 is rotated in the clockwise direction in FIG. 4A by the rotational drive of the first actuator 21a, thereby adjusting the tilt angle of the first reflecting portion 21 to rise more. At the same time, the second reflecting portion 22 is rotated clockwise in FIG. 4A by the rotational drive of the second actuator 22a, thereby adjusting the inclination angle of the second reflecting portion 22 to rise more. As a result, the image light 100a emitted from the HUD device 1 is projected onto the projection point Pa located above the windshield 2a. As a result, the image light 100a emitted from the HUD device 1 is projected onto the projection point Pa located above the windshield 2a and travels toward the high viewpoint position 3a.

  FIG. 4B shows a case where the viewpoint position 3 of the user is at a low position (reference numeral 3b). At this time, the user controls the first actuator 21a and the second actuator 22a by operating an operation unit 90 described later. In this case, the first reflecting portion 21 is rotated in the counterclockwise direction in FIG. 4B by rotating the first actuator 21a, thereby adjusting the tilt angle of the first reflecting portion 21 in the tilting direction. At the same time, the second reflecting portion 22 is rotated counterclockwise in FIG. 4B by rotating the second actuator 22a, thereby adjusting the tilt angle of the second reflecting portion 22 in the direction of tilting. As a result, the image light 100a emitted from the HUD device 1 is projected onto a projection point Pb located below the windshield 2a. As a result, the image light 100b emitted from the HUD device 1 is projected onto the projection point Pb located below the windshield 2a and travels toward the lower viewpoint position 3b.

  The transmission screen 30 receives the projection light 200 from the optical axis adjustment unit 20 (second reflection unit 22) on the back surface and emits image light 100 that is transmitted and oriented toward the orientation area 400. A holographic diffuser, a microlens array, a diffusion plate, and the like. The transmissive screen 30 directs the diffused light incident upon the projection light 200 to the folding mirror 40. A part of the light diffused by the transmissive screen 30 is oriented as image light 100 to a predetermined orientation area 400 with an orientation angle θ. If the transmission screen 30 is in the alignment area 400, the image light 100 is aligned so that the luminance of the visually recognized virtual image V is visually recognized substantially uniformly. The orientation angle θ of the transmission screen 30 in the present invention is narrower than the orientation angle of the conventional transmission screen. That is, in the HUD device 1 according to the present invention, when the angle of the optical axis of the projection light 200 is constant, the area where the virtual image V can be visually recognized with respect to the movement of the viewpoint of the user is narrower than the conventional one. A bright virtual image V can be visually recognized by a user with a small output. In addition, the transmission screen 30 has an orientation angle limiting portion 31 unique to the present application, which has a smaller orientation angle than other regions. The specific operation of the transmission screen 30 including the orientation angle limiting unit 31 will be described in detail later.

  The folding mirror 40 is formed by forming a reflective film on the surface of a base material made of, for example, a synthetic resin material or a glass material by means such as vapor deposition. The image light 100 diffused and transmitted by the transmissive screen 30 will be described later. The light is reflected toward the concave mirror 50.

  The concave mirror 50 is, for example, formed by forming a reflective film on the surface of a base material made of a synthetic resin material by means such as vapor deposition, and the curvature of the concave mirror 50 has a concave free-form surface, and its detailed surface. The shape is such that the positional relationship among the transmission screen 30, the folding mirror 40, the windshield 2a (reflection / transmission surface), the range of movement of the user's viewpoint position 3, the curvature of the windshield 2a, and the required virtual image V It is calculated by optical design software based on the imaging distance and the angle of view of the HUD device 1 visually recognized by the user. The concave mirror 50 is designed so that the distortion of the virtual image V is minimized under the constraint that the position of the virtual image V does not change even if the user's viewpoint position 3 moves within the eyebox range by optical design software. The image light 100 reflected by the folding mirror 40 is magnified and reflected toward the windshield 2a.

  The casing 60 is a substantially box-shaped member made of, for example, a metal material such as aluminum, and is provided with various attachment portions (not shown) inside. In the present embodiment, the projector 60 and the optical axis adjustment The unit 20, the transmissive screen 30, and the folding mirror 40 are held in a predetermined positional relationship. Further, the inner surface of the housing 60 is painted, for example, in black, so that stray light caused by the outside of the HUD device 1 or the projection device 10 is hardly generated. Further, on the upper surface of the housing 60, a light transmitting portion 61 formed of a transparent resin material that transmits the image light 100 reflected by the concave mirror 50 is provided.

  The electrical configuration of the HUD device 1 will be described with reference to FIG. As shown in FIG. 5, the control unit 70 includes a processing unit 71 having one or more microprocessors, microcontrollers, ASICs, FPGAs, arbitrary other ICs, a rewritable RAM, a read-only ROM, A storage unit 72 having one or a plurality of memories capable of storing programs and data such as an EEPROM and a flash memory which is a nonvolatile memory, and an input / output unit 73 connected to a network unit 80 to be described later . The control unit 70 is mounted on a printed circuit board (not shown) provided inside or outside the housing 60.

  The network unit 80 is, for example, CAN (Controller Area Network) bus communication and the like, and the control unit 70 can exchange signals with the projection device 10, the first actuator 21a, the second actuator 22a, an operation unit 90 described later, and the like. Connecting.

  The processing unit 71 reads out and executes a program stored in the storage unit 72 for executing the above-described optical axis adjustment processing and the like. Further, the processing unit 71 distorts the image generated by the reflective display 14 in advance and emits it as the projection light 200, so that the angles of the first reflecting unit 21 and the second reflecting unit 22, the curvature of the concave mirror 50, It is possible to cancel or reduce image distortion caused by the curvature of the windshield 2a (reflection / transmission surface), the user's viewpoint position 3, and the like.

  The operation unit 90 is a plurality of push button switches (not shown) or the like provided on the steering of the vehicle 2 for inputting operations such as up / down / left / right and determination. The operation unit 90 outputs operation information to the control unit 70 of the HUD device 1 via the network unit 80 based on a user operation. The processing unit 71 performs an optical axis adjustment process based on operation information from the operation unit 90. Specifically, when the operation unit 90 shown above is operated, the processing unit 71 drives the first actuator 21a and the second actuator 22a to bring the image light 100a to the high viewpoint position 3a (see FIG. 4A). When the operation unit 90 shown below is operated, the first actuator 21a and the second actuator 22a are driven, and the optical axis of the image light 100b (see FIG. 4B) is set to the low viewpoint position 3b. Turn. The user confirms that the optical axis confirmation virtual image V1 visually recognized via the orientation angle limiting unit 31 provided on the transmission type screen 30 described later can be visually confirmed, so that the light in a state suitable for his / her viewpoint position 3 is obtained. It can be recognized that the axis has been adjusted. Specifically, as shown in FIG. 6A, when an optical axis confirmation virtual image V1 to be described later can be visually recognized, this indicates that the optical axis adjustment suitable for the viewpoint position 3 has been performed, and FIG. ), When the optical axis confirmation virtual image V1 cannot be visually recognized, it indicates that the optical axis adjustment suitable for its own viewpoint position 3 has not been made.

  Hereinafter, the operation of the transmissive screen 30 and the orientation angle limiting portion 31 provided on the transmissive screen 30 will be described with reference to FIGS. FIG. 7 is a diagram for explaining the image light 100 incident on the viewpoint position 3 from the transmissive screen 30, and FIG. 8 shows the image light incident on the viewpoint position 3 a higher than the viewpoint position 3 from the transmissive screen 30. It is a figure for demonstrating 100a. FIG. 9 is a diagram for explaining the relationship between the optical axis adjustment and the orientation angle limiting unit 31.

As shown in FIG. 6C, the transmission screen 30 has an orientation angle limiting portion 31 having a smaller orientation angle than other regions unique to the present invention.
The orientation angle limiting unit 31 is formed by arranging an optical member such as a hole having a predetermined size, an anisotropic diffusing member, or a prism on the transmissive screen 30. The projection light 200 (projection light 203 in FIG. 7 described later, projection light 203a in FIG. 8) along the optical axis is disposed at a position where it passes. The optical axis here refers to a region where the projection apparatus 10 emits the projection light 200 and the approximate center in the height direction (Y-axis direction) of the alignment area 400 (an alignment area center 401 in FIG. 7 described later, an alignment in FIG. This is an axis that optically connects the area center 401a). Incidentally, the optical axis only needs to pass through the approximate center of the alignment area 400 in the height direction (Y-axis direction), and may be an axis directed to an arbitrary position in the horizontal direction of the alignment area 400. As shown in FIGS. 7 and 8, the projection lights 203 and 203 a along the optical axis pass through the orientation angle restricting portion 31 and are oriented at a restricted orientation angle θs (θsa) that is sufficiently smaller than other regions of the transmission screen 30. It goes to the area center 401 (orientation area center 401a).
In addition, by configuring the orientation angle limiting portion 31 with an anisotropic diffusion member, the alignment angle 400 in the height direction (Y-axis direction) of the alignment area 400 and the orientation angle in the horizontal direction (X-axis direction). (Not shown) can be made different, and the orientation angle in the horizontal direction of the orientation area 400 by the orientation angle restricting portion 31 formed of an anisotropic diffusion member is made wider than the restricted orientation angle θs in the height direction. Thus, even if the user's viewpoint position 3 varies in the horizontal direction, the user can visually recognize the optical axis confirmation virtual image V1 for adjusting the height direction of the orientation area 400.

  Hereinafter, the operation of the transmission screen 30 in this embodiment will be described with reference to FIG. The projection light 200 is incident on the transmissive screen 30 with a spread. In FIG. 7, one end of the projection light 200 incident on the transmissive screen 30 is denoted by reference numeral 201 and the other end is denoted by reference numeral 202. . Further, the projection light 200 along the optical axis of the projection light 200 is denoted by reference numeral 203.

  The projection light 201 enters the transmission screen 30 and is emitted toward the alignment area 400 as the image light 101 having the alignment angle θ1. Similarly, the projection light 202 enters the transmissive screen 30 and is emitted toward the alignment area 400 as the image light 102 having the alignment angle θ2. The projection light 203 is incident on the orientation angle restricting portion 31 of the transmissive screen 30 and is in the height direction (Y-axis direction) of the orientation area 400 as the restricted image light 103 having a restricted orientation angle θs sufficiently smaller than θ1 and θ2. The light is emitted toward the center of the alignment area 401 which is substantially the center. That is, the projection light 201 incident on the alignment angle limiting unit 31 is directed to the alignment area center 401, which is a limited region of the alignment area 400, and therefore more than the projection light 200 incident on the region of the other transmissive screen 30. The viewpoint position 3 that can be visually recognized is limited. Therefore, when the optical axis confirmation virtual image V <b> 1 (see FIG. 6) indicated by the projection light 203 can be visually recognized, the user clearly indicates that his / her viewpoint position 3 is located at the approximate center in the height direction of the orientation area 400. Can be recognized. Since the user's viewpoint position 3 is arranged at substantially the center in the height direction of the orientation area 400, the viewpoint position 3 can be changed even when the user's viewpoint position 3 changes due to a change in the posture of the user, vibration of the vehicle 2, or the like. It becomes difficult to deviate from the orientation area 400, and even if the viewpoint position 3 moves a little, the brightness of the virtual image V is kept constant, and the display quality can be improved.

  Hereinafter, the operation of the transmission screen 30 with respect to the high viewpoint position 3a in the present embodiment will be described with reference to FIG. In FIG. 8, one end of the projection light 200a incident on the transmission screen 30 is denoted by reference numeral 201a, and the other end is denoted by reference numeral 202a. Further, the projection light 200a along the optical axis is denoted by reference numeral 203a.

  The projection light 201a is incident on the transmissive screen 30, and is emitted toward the alignment area 400a as image light 101a having an alignment angle θ1a. Similarly, the projection light 202a is incident on the transmissive screen 30, and is emitted toward the alignment area 400a as image light 102a having an alignment angle θ2a. The projection light 203a is incident on the orientation angle restricting portion 31 of the transmissive screen 30, and in the height direction (Y-axis direction) of the orientation area 400a as the restricted image light 103a having a restricted orientation angle θsa sufficiently smaller than θ1a and θ2a. The light is emitted toward an alignment area center 401a which is substantially the center. That is, the projection light 203a incident on the alignment angle limiting unit 31 is directed to the alignment area center 401a, which is a limited area of the alignment area 400a, and therefore more than the projection light 200a incident on the area of the other transmissive screen 30. The viewpoint position 3 that can be visually recognized is limited. Therefore, when the user can visually recognize the optical axis confirmation virtual image V1 indicated by the projection light 203a, the user clearly recognizes that his / her viewpoint position 3 is located at substantially the center in the height direction of the orientation area 400a. be able to.

  In addition, the projection apparatus 10 has a circular shape that indicates an optical axis confirmation virtual image V <b> 1 generated by the projection light 200 incident on the orientation angle restriction unit 31 in a region around the orientation angle restriction unit 31 in the transmission screen 30. The projection light 200 for generating the confirmation area virtual image V2 is projected. By doing in this way, as shown in FIG. 6, the confirmation area virtual image V2 can be displayed in the area where the optical axis confirmation virtual image V1 is displayed. The user may adjust the optical axis so that the optical axis confirmation virtual image V1 is displayed in the confirmation area virtual image V2 by operating the operation unit 90 while visually recognizing the region surrounded by the confirmation area virtual image V2. It is possible to reduce the line-of-sight movement for searching for the optical axis confirmation virtual image V1 during the optical axis adjustment. The optical axis confirmation virtual image V1 and the confirmation area virtual image V2 are not displayed when the HUD device 1 is activated and started to be displayed, and when the user finishes the optical axis confirmation and determines with the operation unit 90. Further, when an operation menu for optical axis adjustment is selected on the operation unit 90, display of the optical axis confirmation virtual image V1 and the confirmation area virtual image V2 may be started.

  As shown in FIG. 9, the optical axis adjustment unit 20 adjusts the optical axis so that the projection light 203 (projection light 203a) along the optical axis is approximately centered on the orientation angle limiting unit 31. With such a configuration, the restricted image light 103 (restricted image light 103a) that has passed through the orientation angle restricting portion 31 can be directed to the approximate center of the orientation area 400 in the height direction (Y-axis direction).

  However, in the case where a plurality of alignment angle limiting units 31 are provided, such as the alignment angle limiting unit 31 and the alignment angle limiting unit 31a shown in FIG. 10, the optical axis adjustment unit 20 projects the projection light 203 (projection light 203a) along the optical axis. However, it is not necessary to adjust the optical axis so that the orientation angle restricting portion 31 is at the center. In such a case, as shown in FIG. 11, the projection light 203 passes through different orientation angle restriction units 31 (orientation angle restriction units 31a) according to the viewpoint position 3 (viewpoint position 3a). Even in such a configuration, the optical axis can be adjusted so that the approximate center of the orientation area 400 is directed to the user's viewpoint position 3.

  In the above embodiment, the first reflecting portion 21 and the second reflecting portion 22 are rotated by separate actuators. However, the first reflecting portion 21 and the second reflecting portion 22 are rotated by a common actuator (not shown). It may be moved. In addition, the 1st reflective part 21 and the 2nd reflective part 22 differ by changing gear ratios, such as a gearwheel which transmits motive power from the said common actuator to each of the 1st reflective part 21 and the 2nd reflective part 22, and are common. The rotation angle associated with the drive of the actuator may be controlled to be different.

  Moreover, in the said embodiment, the angle of the optical axis of the projection light 200 is adjusted by rotating the 1st reflective part 21 and the 2nd reflective part 22 using the 1st actuator 21a and the 2nd actuator 22a. However, the angle of the optical axis of the projection light 200 may be adjusted by rotating and moving the reflecting portion with one actuator.

  Further, the optical axis adjustment unit 20 only needs to be able to adjust the angle of the optical axis of the projection light 200 incident on the transmissive screen 30, and thus is configured with an actuator (not shown) that rotates or / and moves the projection apparatus 10 itself. Also good.

  Further, the reflection / transmission surface onto which the image light 100 is projected is not limited to the windshield 2 a of the vehicle 2. The reflection / transmission surface onto which the image light 100 is projected may be, for example, a dedicated combiner member.

  In the above description, in order to facilitate the understanding of the present invention, the description of known unimportant technical matters is appropriately omitted.

1 HUD device (head-up display device)
2 Own vehicle 2a Windshield (reflection / transmission surface)
DESCRIPTION OF SYMBOLS 3 Viewpoint position 10 Projection apparatus 11 Light source 12 Light source mirror 13 Prism 14 Reflective display 15 Projection lens 20 Optical axis adjustment part 21 First reflection part 21a First actuator 22 Second reflection part 22a Second actuator 30 Transmission type screen 40 Folding Mirror 50 Concave mirror 60 Case 70 Control unit 71 Processing unit 72 Storage unit 73 Input / output unit 80 Network unit 90 Operation unit 100 Image light

V1 Optical axis confirmation virtual image V2 Confirmation area virtual image

Claims (6)

In a head-up display device that causes a virtual image to be visually recognized by projecting image light onto a reflection / transmission surface and adjusts a projection position of the image light on the reflection / transmission surface, a projection device that emits projection light indicating an image, and the projection A transmissive screen that emits the image light in which the projection light from the apparatus is transmissively oriented, and an optical axis adjustment unit that adjusts an incident angle of the projection light incident on the transmissive screen,
The transmissive screen has an orientation angle limiting part that emits the image light having a smaller orientation angle than other regions in part.
A head-up display device. The transmissive screen orients the image light so that the luminance of a virtual image viewed in a predetermined orientation area is substantially uniform, and the orientation angle limiting portion is substantially at the center in the height direction of the orientation area. Orienting the image light in position,
The head-up display device according to claim 1. The optical axis is an axis that optically connects the region where the projection device emits the projection light and the approximate center in the height direction of the alignment area,
The orientation angle limiting portion is disposed in a region including a position through which the optical axis of the projection light passes in the transmissive screen.
The head-up display device according to claim 1, wherein the head-up display device is a head-up display device. The projection device generates a confirmation area virtual image indicating an optical axis confirmation virtual image generated by the projection light incident on the orientation angle restriction unit in a region around the orientation angle restriction unit in the transmission screen. Projecting the projection light;
The head-up display device according to any one of claims 1 to 3. The optical axis adjustment unit includes: a first reflection unit that reflects the projection light emitted from the projection device on the transmission screen; a second reflection unit that reflects the projection light reflected by the first reflection unit; An actuator that adjusts the angle of the optical axis of the image light that is incident on the transmissive screen by rotating the first reflecting portion and the second reflecting portion;
The head-up display device according to any one of claims 1 to 4, wherein the head-up display device is provided. The actuator includes a first actuator that rotates the first reflecting portion, and a second actuator that rotates the second reflecting portion.
The head-up display device according to claim 1, wherein the head-up display device is a head-up display device.

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