JP2020118933A - Head-up display device - Google Patents

Abstract

To provide a head-up display (HUD) device in which an optical member can be disposed with a simple configuration.SOLUTION: The HUD device displays a virtual image of an image expressed by display light by emitting the display light from an emission port toward a light-transmitting member. The HUD device includes a screen S, an optical member 20, a support part 32 and a drive control part. The screen S receives the display light emitted by a display, which means the image is projected on the screen. The optical member 20 is located closer to the display than the screen S on the optical path of the display light, and transmits the display light. The support part 32 rotatably supports the screen S. The drive control part drives to rotate the screen S with respect to the support part 32 so as to adjust the display angle of the virtual image. The support part 32 has a fixing part where the optical member 20 is fixed. The optical member 20 is, for example, a field lens.SELECTED DRAWING: Figure 3

Description

The present invention relates to a head-up display device.

As a conventional head-up display (HUD) device, for example, in Patent Document 1, it is mounted on a vehicle and emits display light toward a transparent member such as a windshield to display a virtual image of an image represented by the display light. What is done is disclosed. The HUD device disclosed in Patent Document 1 is configured to be able to adjust the display angle of a virtual image by rotationally driving a screen on which an image is projected.

JP, 2018-167669, A

As described above, when the screen can be rotated and driven, a mechanism for rotating the screen is required, and thus it is necessary to efficiently lay out optical members such as lenses arranged near the screen. Is required. For example, if a dedicated component is provided to fix the optical member, the configuration may be complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a head-up display device capable of providing an optical member with a simple structure.

In order to achieve the above object, a head-up display device according to the present invention,
A head-up display device having an emission port, which displays a virtual image of an image represented by the display light by emitting display light from the emission port toward a transparent member,
A screen on which the display light emitted from the display is received and the image is projected,
An optical member that is located on at least one of the display side and the screen side that is closer to the exit than the screen on the optical path of the display light, and that transmits the display light.
A support portion that rotatably supports the screen,
A drive control unit that adjusts the display angle of the virtual image by rotating the screen with respect to the support unit;
The support part has a fixing part to which the optical member is fixed.

According to the present invention, the optical member can be provided with a simple structure.

It is a schematic diagram for explaining a display mode of a head-up display (HUD) device according to an embodiment of the present invention. It is a principal part top view of a HUD apparatus. It is a perspective view of an optical member, a screen unit, and a drive mechanism. It is a perspective view of a screen and a bezel. It is a perspective view of a support part. FIG. 3 is a perspective view of a light shielding wall portion and a visible light transmitting portion.

An embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a head-up display (HUD) device 1 according to the present embodiment is arranged on a dashboard of a vehicle 2 and outputs display light L representing an image from an emission port 1a to a windshield 3 of the vehicle 2. Eject toward (the windshield). The image represented by the display light L reflected by the windshield 3 is viewed by the user 4 (mainly the driver of the vehicle 2) as a virtual image V in front of the windshield 3. In this way, the HUD device 1 displays the virtual image V overlaid on the scenery in front of the vehicle 2. The image visually recognized as the virtual image V notifies, for example, information such as vehicle speed regarding the vehicle 2, route guidance information in car navigation, and attention information in front of the vehicle 2 (presence of a preceding vehicle, a pedestrian, etc.). It is an image for.

As shown mainly in FIG. 2, the HUD device 1 includes a display P, a first optical relay 10, an optical member 20, a screen unit 30 having a screen S, a drive mechanism 40, and a light shielding wall 50. A visible light transmitting portion (visible light transmitting member) 60, a second optical relay 70, a control portion 80, and a case 90 are provided. The outlet 1a of the HUD device 1 is formed in a cover (not shown) that covers the case 90 from above. A translucent plate (not shown) is provided at the emission port 1a.

The display P emits the display light L so as to project an image on the screen S by the field sequential method. The display P includes an LED (Light Emitting Diode) group, a reflective display element, a projection lens, and the like. The LED group is composed of a plurality of LEDs each emitting different colors (red, green and blue), driven by the field sequential method by the controller 80, and emits light with a predetermined intensity and timing. The reflective display element receives the light emitted from the LED group and combined by the dichroic mirror (combined light) to generate display light L, which is emitted toward the projection lens. The reflective display element is, for example, a DMD (Digital Micro-mirror Device) having a plurality of movable micro mirrors, and each mirror is controlled to be either on or off by the control of the control unit 80. As a result, the combined light is spatially modulated to generate the display light L. The projection lens magnifies the display light L according to the screen S.

The first optical relay 10 is composed of, for example, two plane mirrors 11 and 12. The plane mirror 11 reflects the display light L from the display P toward the plane mirror 12. The plane mirror 12 reflects the display light L reflected by the plane mirror 11 toward the screen S.

The optical member 20 is a field lens located on the display P side of the screen S with respect to the optical path of the display light L, and the image is clear by changing the traveling direction of the light in the outer peripheral portion of the image indicated by the display light L. Turn into. As shown in FIG. 3, the optical member 20 is held by the pair of holding portions K1 and K2. The holding portion K1 is a plate-shaped member that projects from the optical member 20 toward a stay 321 described below. The holding portion K2 is a plate-shaped member that projects from the optical member 20 toward a stay 322 described below. The fixing mode of the optical member 20 will be described later.

As shown in FIG. 3, the screen unit 30 includes a screen S, a bezel 31 that holds the screen S, and a support portion 32 that rotatably supports the screen S via the bezel 31.

The screen S is formed in a rectangular shape in a plan view, for example, and receives the display light L transmitted through the optical member 20 to display the image represented by the display light L. The screen S is composed of, for example, a transmissive screen such as a holographic diffuser, a microlens array, and a diffusion plate. When the image is displayed on the screen S, the display light L representing the image is directed to the plane mirror 71 described later.

The bezel 31 is a frame body that surrounds the outer periphery of the screen S, and has a pair of shaft portions 31a and 31b extending along the axis AX, as shown in FIG. The shaft portion 31a projects to the left side of the screen S in FIG. The shaft portion 31b projects rightward of the screen S in FIG.

As shown in FIGS. 3 and 5, the support portion 32 includes a pair of stays 321 and 322, and is fixed to the bottom portion 91 (see FIG. 2) of the case 90. As shown in FIG. 3, the stay 321 and the stay 322 are substantially plate-shaped members that face each other in the direction in which the axis AX extends.

As shown in FIG. 5, the stay 321 includes an installation portion 321 a fixed to the bottom portion 91. The installation portion 321a is a plate-shaped portion having a surface facing the bottom portion 91. Further, the stay 321 has a bearing hole Ha into which the shaft portion 31a of the bezel 31 is inserted. A plate-shaped fixing portion 321b protruding toward the stay 322 is provided on a surface of the stay 321 facing the stay 322. The holding portion K1 of the pair of holding portions K1 and K2 that holds the optical member 20 is fixed to the fixing portion 321b. The stay 322 includes an installation portion 322a fixed to the bottom portion 91. The installation portion 322a is a plate-shaped portion having a surface facing the bottom portion 91. Further, the stay 322 has a bearing hole Hb into which the shaft portion 31b of the bezel 31 is inserted. A plate-shaped fixing portion 322b protruding toward the stay 321 is provided on the surface of the stay 322 facing the stay 321. The holding portion K2 of the pair of holding portions K1 and K2 that holds the optical member 20 is fixed to the fixing portion 322b.

The shaft portion 31a provided on the bezel 31 is rotatably supported by a bearing hole Ha provided on the stay 321. The shaft portion 31b provided on the bezel 31 is rotatably supported by a bearing hole Hb provided on the stay 322. As a result, the support portion 32 including the pair of stays 321 and 322 supports the screen S rotatably around the axis AX via the bezel 31.

The holding portion K1 is fixed to the fixing portion 321b provided on the stay 321. Further, the holding portion K2 is fixed to the fixing portion 322b provided on the stay 322. That is, the optical member 20 is fixed to the fixing portions 321b and 322b provided on the support portion 32 via the holding portions K1 and K2. In addition, a method of fixing the holding portions K1 and K2 to the fixing portions 321b and 322b and a method of fixing the installation portions 321a and 322a to the bottom portion 91 of the case 90 are arbitrary, and known methods such as fitting, screwing, and bonding are known. Any method can be used as appropriate.

The drive mechanism 40 drives the screen S held by the bezel 31 to rotate about the axis AX. The drive mechanism 40 engages with the gear portion 41 fixed to the tip of the shaft portion 31 a of the bezel 31, and the gear portion 41. An output shaft portion 42 having a gear to be fitted and a motor (not shown) are provided. As shown in FIG. 3, the gear portion 41 is fixed to a tip portion of a portion of the shaft portion 31a provided on the bezel 31 that protrudes outside the stay 321 through the bearing hole Ha. The motor is, for example, a stepping motor and is driven by the control of the control unit 80. The driven motor rotates the output shaft portion 42 via one or a plurality of gears. When the output shaft portion 42 rotates, the gear portion 41 having teeth that mesh with the output shaft portion 42 also rotates. In this way, the rotational power of the motor is transmitted to the gear portion 41 fixed to the shaft portion 31a via the output shaft portion 42, and the screen S held by the bezel 31 is moved relative to the support portion 32 by the axis line AX. Rotate around.

The light shielding wall portion 50 is located on the optical path of the display light L closer to the exit 1a side than the screen S, and from the exit 1a, unnecessary portions other than the image displayed on the screen S (the display P side of the screen S). This is to cover up the unnecessary portion so that the appropriate structure located at (1) cannot be seen.

The light shielding wall portion 50 is, for example, a plate-shaped member formed of a resin material in black, and is fixed to the case 90 by a known method in a state of standing upright from the bottom portion 91 of the case 90. As shown in FIG. 2, the light shielding wall portion 50 has a first portion 51 facing the screen unit 30 and a second portion 52 bent from the first portion 51, and is L-shaped when viewed from above. It is formed in a shape. An opening 51a for allowing the display light L emitted from the screen S to pass therethrough when an image is displayed on the screen S is formed at a position facing the screen S in the first portion 51. As shown in FIG. 2, the tip of the second portion 52 is close to one end of a flat mirror 71, which will be described later, and suppresses unnecessary light from entering the flat mirror 71.

The visible light transmitting portion 60 is a hot mirror that is located closer to the exit 1a side than the screen S on the optical path of the display light L, and reflects infrared rays from the sunlight that enters through the exit 1a, so that heat is generated inside. Suppress propagation. As shown in FIG. 6, the visible light transmitting portion 60 is fixed to the opening 51a of the light shielding wall portion 50 by a known fixing method. The visible light transmitting portion 60 is rotationally driven by the drive mechanism 40 and is fixed to the opening portion 51a with an inclination similar to an arbitrary inclination posture of the tiltable screen S. Thus, the opening 51a to which the visible light transmitting portion 60 is fixed is formed in a portion of the light shielding wall portion 50 that is raised from the first portion 51 to the screen S side, and is visible depending on the shape of the raised portion. The inclination posture of the light transmitting portion 60 is determined. Each of the visible light transmitting portion 60 and the above-described optical member 20 is provided at a position that does not interfere with the tilt adjustable range of the screen S.

The second optical relay 70 is composed of, for example, a plane mirror 71 and a concave mirror 72. The plane mirror 71 reflects the display light L emitted from the screen S and transmitted through the visible light transmitting portion 60 toward the concave mirror 72. The concave mirror 72 reflects the display light L reflected by the plane mirror 71 toward the windshield 3. As a result, the image visually recognized as the virtual image V by the user 4 becomes larger than the image displayed on the screen S.

The control unit 80 controls the entire operation of the HUD device 1, and is composed of, for example, a microcomputer. The control unit 80 includes a storage unit including a ROM (Read Only Memory) and a RAM (Random Access Memory), and a CPU (Central Processing Unit) that executes an operation program stored in the ROM. The control unit 80 schematically shown in FIG. 2 is mounted on, for example, a printed circuit board provided at an arbitrary position of the case 90, and the display P, the motor of the drive mechanism 40, and , And is electrically connected to various systems configured in the vehicle 2. Note that the arrangement and configuration of the control unit 80 are arbitrary. For example, the control unit 80 may include a plurality of control ICs (Integrated Circuits) that cooperate with each other.

The control unit 80 communicates with an ECU (Electronic Control Unit), a car navigation system, various sensors, and the like mounted on the vehicle 2 to acquire various information and display an image for displaying a virtual image V indicating various information. Generate data. Then, the control unit 80 controls the emission operation of the display light L by the display device P via a display control driver (not shown) based on the generated image data.

The control unit 80 also drives the motor of the drive mechanism 40 via a motor driver (not shown). For example, the control unit 80 drives the motor according to the instruction to adjust the display angle of the virtual image V, and rotates the screen S about the axis AX by an angle corresponding to the content of the adjustment instruction. The adjustment instruction is based on, for example, a gyro sensor mounted on the vehicle 2 or a gradient of a road surface ahead of the vehicle 2 that can be specified based on information from the car navigation system. Thereby, the control unit 80 can adjust the virtual display surface of the virtual image V, which is in an optical conjugate relationship with the image display surface of the screen S, so as to be along the front road surface of the vehicle 2. That is, the user 4 can visually recognize the virtual image V displayed along the front road surface. The adjustment instruction may be in accordance with an input operation by the user 4 from the operation means, or may be in accordance with a detection result from the detection means for detecting the viewpoint position of the user 4. .. The operation means can be composed of, for example, a touch panel or push buttons. The detection means can be composed of, for example, a stereo camera. Other known configurations may be appropriately adopted as the operation unit and the detection unit.

The case 90 is formed in a box shape that opens upward of the vehicle 2, and includes the display P, the first optical relay 10, the optical member 20, the screen unit 30, the drive mechanism 40, the light shielding wall portion 50, and the second. Each of the optical relay 70 and the control unit 80 is housed at an appropriate position that fulfills the above-mentioned functions. The visible light transmitting portion 60 is fixed to the light shielding wall portion 50 as described above. Further, the case 90 may be configured by combining a plurality of members.

A mechanism for displaying the virtual image V by the HUD device 1 having the above configuration will be briefly described. The display light L emitted from the display P is projected as an image on the screen S via the first optical relay 10 and the optical member 20. The display light L representing the image displayed on the screen S is emitted from the emission port 1a to the windshield 3 via the visible light transmitting portion 60 and the second optical relay 70. In this way, the display light L emitted from the HUD device 1 is reflected by the windshield 3, so that the virtual image V is displayed in front of the windshield 3 as seen from the user 4.

The present invention is not limited to the above embodiments and drawings. Modifications (including deletion of components) can be appropriately added to the embodiments and the drawings without changing the gist of the present invention.

In the above, the example in which the optical member 20 fixed to the supporting portion 32 is the field lens located closer to the display P than the screen S on the optical path of the display light L has been shown, but the present invention is not limited to this. A known lens may be used. In addition, by extending the stays 321 and 322 in the traveling direction of the display light L as compared with the illustrated example, the optical member 20 located on the emission port 1a side of the screen S on the optical path of the display light L is provided on the support portion 32. You may employ the structure fixed. The optical member 20 in this case is not limited to a lens, and may be a hot mirror or the like. Further, the number of the optical members 20 fixed to the supporting portion 32 is arbitrary, and may be one or plural. That is, the optical member 20 fixed to the support portion 32 is located on at least one of the display P side of the screen S and the exit 1a side of the screen S on the optical path of the display light L. Good.

The example in which the visible light transmitting portion 60 fixed to the opening 51a of the light shielding wall portion 50 is a hot mirror has been described above, but the invention is not limited to this, and other visible transmitting members such as an antireflection sheet may be used. Good. Further, the visible light transmitting portion 60 fixed to the opening 51a may be composed of one visible light transmitting member, or may be composed of a plurality of visible light transmitting members having different roles.

Although the example in which the first optical relay 10 is composed of the two plane mirrors 11 and 12 has been described above, the invention is not limited to this and may be composed of a single mirror or three or more mirrors. Similarly, the second optical relay 70 may be composed of a single mirror or three or more mirrors as long as it has at least the concave mirror 72. Further, at least one of the first optical relay 10 and the second optical relay 70 may include a curved mirror (including a free curved mirror) having a curved surface for correcting image distortion.

In the above, an example in which the display P is a projector of a system including a reflective display element made of DMD has been described, but the projector system is not limited to this. For example, the projector may be an LCOS (Liquid Crystal On Silicon) projector, a GLV (Grating Light Valve) projector, a CRT (Cathode Ray Tube) projector, a liquid crystal projector, or the like.

Further, the translucent member, which is the target for the HUD device 1 to emit the display light L, is not limited to the windshield 3. For example, the translucent member may be a combiner dedicated to the HUD device 1 other than the windshield 3.

The vehicle on which the HUD device 1 is mounted is not limited to the vehicle, and may be another vehicle such as a ship or an airplane.

(1) The HUD device 1 described above has the emission opening 1a, and an image represented by the display light L is obtained by emitting the display light L from the emission opening 1a toward the windshield 3 (an example of a translucent member). The virtual image V of is displayed. The HUD device 1 includes a screen S, an optical member 20, a support unit 32, and a drive control unit (for example, the control unit 80 and the drive mechanism 40). The screen S receives the display light L emitted by the display P and projects an image. The optical member 20 is located on at least one of the display P side of the screen S and the emission port 1a side of the screen S on the optical path of the display light L, and transmits the display light L. The support part 32 rotatably supports the screen S. The drive controller adjusts the display angle of the virtual image V by driving the screen S to rotate with respect to the support 32. The support portion 32 has fixing portions 321b and 322b to which the optical member 20 is fixed.
With this configuration, it is not necessary to provide a dedicated component for fixing the optical member 20, and it is possible to suppress an increase in the number of components. Therefore, according to the above HUD device 1, the optical member 20 can be provided with a simple structure.

(2) Further, the HUD device 1 includes the light blocking wall portion 50 located on the optical path of the display light L and closer to the exit 1a than the screen S. The light shielding wall 50 has an opening 51a at a position facing the screen S, and the visible light transmitting member 60 is fixed to the opening 51a.
With this configuration, it is not necessary to provide a dedicated component for fixing the visible light transmitting member 60, and it is possible to suppress an increase in the number of components. Therefore, according to the HUD device 1 described above, the visible light transmitting member 60 can be provided with a simple structure.

(3) It is preferable that the optical member 20 is a field lens located on the display P side of the screen S on the optical path of the display light L.

(4) Further, the visible light transmitting member 60 is preferably a hot mirror.

In the above description, in order to facilitate understanding of the present invention, description of well-known technical matters that are not important is appropriately omitted.

DESCRIPTION OF SYMBOLS 1... Head-up display (HUD) device 1a... Ejection port 2... Vehicle 3... Windshield 4... User L... Display light, V... Virtual image P... Indicator 10... 1st optical relay 20... Optical member, K1, K2... Holding part 30... Screen unit S... Screen 31... Bezel, 31a, 31b... Shaft part, AX... Axis 32... Support part 321,322... Stays 321a, 322a... Installation part 321b, 322b... Fixed part Ha, Hb... Bearing hole 40... Driving mechanism 50... Light-shielding wall portion 51... First portion, 51a... Opening portion 52... Second portion 60... Visible light transmitting portion (visible light transmitting member)
70... 2nd optical relay 80... Control part 90... Case, 91... Bottom part

Claims (4)

A head-up display device having an emission port, which displays a virtual image of an image represented by the display light by emitting display light from the emission port toward a transparent member,
A screen on which the display light emitted by the display device is projected and the image is projected,
An optical member positioned on at least one of the display side and the screen side of the screen relative to the screen on the optical path of the display light, and transmitting the display light,
A support portion that rotatably supports the screen,
A drive control unit that adjusts the display angle of the virtual image by rotating the screen with respect to the support unit;
The support portion has a fixing portion to which the optical member is fixed,
Head-up display device. A light-shielding wall portion located closer to the exit side than the screen on the optical path of the display light;
The light shielding wall has an opening at a position facing the screen,
A visible light transmitting member is fixed to the opening,
The head-up display device according to claim 1. The optical member is a field lens located closer to the display than the screen on the optical path of the display light,
The head-up display device according to claim 1. The visible light transmitting member is a hot mirror,
The head-up display device according to claim 2.

Images