JP6204793B2 - Head-up display device - Google Patents

Description

  The present invention relates to a head-up display device that generates various images visually recognized by an occupant.

  Conventionally, various means have been used as information providing means for providing driving information such as route guidance and obstacle warnings to passengers of moving bodies such as vehicles. For example, display on a liquid crystal display installed on a moving body, sound output from a speaker, and the like. In recent years, as one of such information providing means, there is a head-up display device (hereinafter referred to as HUD).

  Here, for example, as described in JP 2009-150947 A, a HUD installed on a vehicle as a moving body is located in front of a vehicle window (for example, a front window) as viewed from the vehicle occupant. Driving information (for example, speed display, route guidance display, etc.) can be generated as a virtual image superimposed on the foreground of the field of view. As a result, the occupant can reduce the line-of-sight movement as much as possible when visually confirming the driving information, and can further reduce the burden during driving.

JP2009-150947A (page 5-6, FIG. 1)

  Here, in order to reduce the burden on the vehicle occupant during driving, it is important to appropriately set the position (more specifically, the distance from the occupant to the virtual image) where the virtual image is generated. For example, in order to generate a virtual image of a warning for an obstacle, it is desirable to generate a virtual image at a position where the obstacle actually exists. In addition, when generating a virtual image that guides a right or left turn of a road, it is desirable to generate a virtual image at a point where the right or left turns.

  The technique of Patent Document 1 discloses that the position of a screen that is a target for projecting an image from a projector is configured to be movable back and forth along an optical path, and the position for generating a virtual image is adjusted. . Furthermore, it is also disclosed that a plurality of virtual images are generated at different distances simultaneously by dividing the screen into a plurality of screens in the left-right direction and configured to move each screen to a different position.

  However, in the technique of Patent Document 1, it is possible to arbitrarily change the distance from the user to the virtual image, but since the range in which the image is projected on the screen is fixed, the ground surface and the virtual image The positional relationship of could not be changed. Therefore, in a situation where the range in which the virtual image can be used in front of the user's line of sight is limited, there is a problem that the range of the video that can be used as a virtual image is narrowed among the images projected on the screen. For example, as shown in FIG. 18, when an image is projected on the entire screen when there is an ascending slope in front of the traveling direction of the vehicle 101 on which the user rides, the lower half of the generated virtual image 102 is embedded in the ground. Therefore, the range that can be used as guidance for the user in the image projected on the screen is limited to the range that generates the upper half of the virtual image 102, and the other range can be used as guidance even though a virtual image can be generated. I can't.

  The present invention has been made to solve the above-described conventional problems, and by using a plurality of screens, it is possible to generate virtual images in various forms, while a virtual image is generated in front of the user's line of sight. It is an object of the present invention to provide a head-up display device that prevents a range of usable virtual images from becoming narrow even in a situation where the range of usable images is limited.

In order to achieve the above object, a head-up display device (1) according to the present invention includes a screen (20, 21), a projector (4) that projects an image on the screen, and a virtual image of the image from the image projected on the screen. And a virtual image generating means (11, 12) for generating a head-up display device that generates a virtual image visible to a user. The screen includes a plurality of screens including a first screen (20) and a second screen (21), and further includes the following means. Specifically, road shape acquisition means for acquiring a road shape in the viewing direction of the user who visually recognizes the virtual image , and at least one of the first screen and the second screen is moved along the optical path of the projector. A front-rear direction moving means (24), a cross-direction moving means (25) for integrally moving the first screen, the second screen, and the front-rear direction moving means along a direction intersecting the optical path; , have a, the projector, the first across the screen and the second screen to projecting the image, based on the road shape obtained by the road shape acquiring unit, upslope in the viewing direction of the user When it is determined that the first screen and the second screen intersect the optical path by the intersecting direction moving means, By moving together to reduce the ratio of the second projection range that projects the image to the second screen to the first projection range that projects the image to the first screen.

According to the head-up display device according to the present invention having the above-described configuration, it is possible to generate a virtual image in various forms by using a plurality of screens, while a range in which the virtual image can be used in front of the user's line of sight It is possible to prevent the range of the virtual image that can be used from becoming narrow even in a situation where is limited. Therefore, it is possible to suppress the occurrence of an area that cannot be substantially used as an area for generating a virtual image in a range in which an image is projected onto the screen as much as possible, and to generate a virtual image using the screen more effectively.
Further, by moving the first screen and the second screen in a direction intersecting the optical path, the shape and position of the virtual image generated based on the image projected on the first screen and the second screen are projected. It is possible to easily change the shape and position of the virtual image generated based on the captured video. Further, the total space in which a virtual image can be generated based on the video projected on each screen is not reduced.
Moreover, even when there is an upward gradient in the user's viewing direction, it is possible to prevent a part of the virtual image generated by changing the position where the virtual image is generated from being embedded in the ground.

It is the figure which showed the installation aspect to the vehicle of HUD which concerns on this embodiment. It is the figure which showed the internal structure of HUD which concerns on this embodiment. It is the figure which showed the 1st projection lens and 2nd projection lens with which a projector is provided. It is the figure which showed the movement aspect of the 2nd projection lens. It is the figure which each showed the 1st screen and the 2nd screen. It is the figure which showed the projection aspect of the image | video of the projector with respect to the 1st screen and the 2nd screen. It is the figure which showed the movement aspect to the front-back direction with respect to the optical path of a 2nd screen. It is the figure which each showed the virtual image produced | generated by the image | video projected on the 1st screen and the 2nd screen. It is the figure which showed the movement aspect to the crossing direction with respect to the optical path of a 1st screen and a 2nd screen. It is the figure which showed the projection aspect of the image | video of a projector at the time of moving a 1st screen and a 2nd screen to an up-down direction. It is the block diagram which showed the structure of HUD which concerns on this embodiment. It is a flowchart of the virtual image generation processing program which concerns on this embodiment. It is the figure which showed an example of the virtual image which can be visually recognized from the passenger | crew of a vehicle at the time of driving | running | working. It is the figure which showed the positional relationship of the 2nd screen and 2nd projection lens at the time of moving a 2nd screen. It is the figure which showed an example of the position setting table. It is the figure explaining the detail of the projection process of an image | video in case there exists an uphill ahead of the advancing direction of a vehicle. It is the figure explaining the detail of the projection process of an image | video in case there exists an uphill ahead of the advancing direction of a vehicle. It is the figure shown about the problem of the prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment embodying a head-up display device according to the present invention will be described in detail with reference to the drawings.

  First, the configuration of a head-up display device (hereinafter referred to as HUD) 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an installation mode of the HUD 1 according to the present embodiment on the vehicle 2.

  As shown in FIG. 1, the HUD 1 is installed inside the dashboard 3 of the vehicle 2, and includes a projector 4 and a screen 5 on which an image from the projector 4 is projected. Then, the image projected on the screen 5 is reflected on the front window 6 in front of the driver's seat through the mirror and Fresnel lens provided in the HUD 1 as will be described later, and is made visible to the passenger 7 of the vehicle 2. ing. Note that the image projected on the screen 5 includes information related to the vehicle 2 and various information used for assisting the driving of the occupant 7. For example, warnings for obstacles (other vehicles and pedestrians), guidance information set by the navigation device and guidance information based on the guidance route (such as arrows indicating the direction of turning left and right), current vehicle speed, guidance signs, map images, traffic information, There are news, weather forecast, time, screen of connected smartphone, TV program and so on.

  Further, in the HUD 1 of the present embodiment, when the occupant 7 visually recognizes an image projected on the screen 5 by reflecting the front window 6, the occupant 7 is not at the position of the front window 6 but at the front of the front window 6. An image projected on the screen 5 at a distant position is configured to be visually recognized as a virtual image 8. The virtual image 8 that can be seen by the occupant 7 is an image projected on the screen 5, but the vertical direction is reversed because the image is projected through the mirror. In addition, the size is changed by using a Fresnel lens.

  Here, regarding the position where the virtual image 8 is generated, more specifically, the distance L from the occupant 7 to the virtual image 8 (hereinafter referred to as a generation distance) L, the shape and position of the mirror and Fresnel lens provided in the HUD 1, and the screen 5 with respect to the optical path It is possible to appropriately set the position depending on the position. In particular, in the present embodiment, the position of the screen 5 is configured to be movable in the front-rear direction along the optical path as will be described later. As a result, the generation distance L can be changed as appropriate. For example, the generation distance L can be changed between 2.5 m and 20 m.

  Next, a more specific configuration of the HUD 1 will be described with reference to FIG. FIG. 2 is a diagram showing an internal configuration of the HUD 1 according to the present embodiment.

  As shown in FIG. 2, the HUD 1 basically includes a projector 4, a screen 5, a reflection mirror 10, a mirror 11, a Fresnel lens 12, a control circuit unit 13, and a CAN interface 14.

  Here, the projector 4 is a video projection device using an LED light source as a light source, and is a DLP projector, for example. As the projector 4, a liquid crystal projector or an LCOS projector may be used. The projector 4 includes a projection lens 15 for projecting an image. In this embodiment, the projection lens 15 is composed of two projection lenses, a first projection lens 16 and a second projection lens 17, which are different from each other. Configure to project video. Here, FIG. 3 is a diagram showing the first projection lens 16 and the second projection lens 17 provided in the projector 4.

  As shown in FIG. 3, the first projection lens 16 and the second projection lens 17 have a divided shape obtained by dividing one circular lens in the vertical direction. Further, the second projection lens 17 below is configured to be movable in the front-rear direction along the optical path. On the other hand, the position of the first projection lens 16 is fixed. Specifically, by driving the lens drive motor 18 on the back side of the second projection lens 17, it is possible to move the second projection lens 17 in the front-rear direction along the optical path as shown in FIG. Become. In particular, in this embodiment, when the screen 5 is moved in the front-rear direction along the optical path as will be described later, the focal point of the image projected from the second projection lens 17 is made to coincide with the position of the screen 5 after the movement. In addition, the second projection lens 17 is also moved to follow.

  The lens drive motor 18 is a stepping motor. The HUD 1 can control the lens driving motor 18 based on the pulse signal transmitted from the control circuit unit 13 and appropriately position the second projection lens 17 with respect to the set position.

  The screen 5 is a projection medium onto which an image projected from the projector 4 is projected. For example, a Fresnel screen or a diffusion screen is used. In the present embodiment, the screen 5 includes two screens, a first screen 20 and a second screen 21. Here, FIG. 5 is a view showing the first screen 20 and the second screen 21.

  As shown in FIG. 5, the first screen 20 has a projection area 22 on which an image is projected upward, and is normally projected from the first projection lens 16 of the projector 4 as shown in FIG. Displayed. On the other hand, the second screen 21 has a projection area 23 on which an image is projected below. In a normal state, the image projected from the second projection lens 17 of the projector 4 is displayed as shown in FIG. Is done. That is, an image is projected from the projector 4 across the first screen 20 and the second screen 21. Further, as will be described later, in the present embodiment, the first screen 20 and the second screen 21 are configured to be movable in a direction that intersects the optical path integrally, and as a result, are projected from the first projection lens 16. A part of the image may be projected onto the second screen 21 or a part of the image projected from the second projection lens 17 may be projected onto the first screen 20 (see FIG. 10).

  Further, as shown in FIGS. 2 and 6, the first screen 20 and the second screen 21 are arranged side by side at predetermined intervals in the front-rear direction along the optical path so that the projection areas 22 and 23 do not overlap. Therefore, in the present embodiment, the virtual image 8 includes a virtual image of a video projected on the first screen 20 (hereinafter referred to as a first virtual image 8A) and a virtual image of a video projected on the second screen 21 (hereinafter referred to as a second virtual image 8B). It will be composed of.

  The second screen 21 is configured to be movable in the front-rear direction along the optical path. On the other hand, the position of the first screen 20 is fixed with respect to the front-rear direction. Specifically, the distance between the first screen 20 and the second screen 21 is changed as shown in FIG. 7 by driving the screen front / rear drive motor 24 on the back side of the second screen 21. The two screens 21 can be moved in the front-rear direction along the optical path. As a result, the position where the second virtual image 8B, which is the virtual image of the image projected on the second screen 21, is generated (specifically, the generation distance L2 that is the distance from the occupant 7 to the second virtual image 8B) is changed. Is possible. The generation distance L2 depends on the distance from the mirror 11 to the second screen 21. That is, the generation distance L <b> 2 is changed in length depending on the distance from the mirror 11 to the second screen 21. For example, the generation distance L2 increases as the distance from the mirror 11 to the second screen 21 increases, and the generation distance L2 decreases as the distance from the mirror 11 to the second screen 21 decreases.

  For example, when the second screen 21 is moved to the projector 4 side (the side where the distance to the mirror 11 is increased), the generation distance L2 is increased (that is, the second virtual image 8B is viewed farther from the passenger 7). It becomes like). On the other hand, when the second screen 21 is moved to the side opposite to the projector 4 (the side where the distance to the mirror 11 is shortened), the generation distance L2 is shortened (that is, the second virtual image 8B is visible closer to the occupant 7). Will come to be). Since the position of the first screen 20 is fixed in the front-rear direction, the position (specifically, from the occupant 7 to the first virtual image 8A, which is a virtual image of the image projected on the first screen 20). The generation distance L1) that is the distance to one virtual image 8A is fixed. Therefore, by changing the generation distance L2, the distance (| L2-L1 |) from the first virtual image 8A to the second virtual image 8B is changed.

  Therefore, if the first screen 20 and the second screen 21 are at the same distance from the mirror 11 along the optical path, the first virtual image 8A and the second virtual image 8B are generated at the same position in front of the vehicle 2. However, when the first screen 20 and the second screen 21 are at different distances from the mirror 11 along the optical path, the first virtual image 8A and the second virtual image 8B are at different positions as shown in FIG. Will be generated. Further, as shown in FIGS. 5 and 6, each screen is arranged so that the projection area 22 of the first screen 20 is positioned above the projection area 23 of the second screen 21, but the mirror 11. Thus, the image is inverted upside down, so that the second virtual image 8B is generated above the first virtual image 8A with reference to the direction intersecting the optical path.

  In the present embodiment, the first screen 20 and the second screen 21 are configured to be integrally movable in a direction crossing the optical path. Specifically, by driving a screen up / down drive motor 25 on the side surface of the first screen 20, the first screen 20, the second screen 21, and the screen front / rear drive motor 24 are integrated with each other as shown in FIG. It is possible to move in a direction that intersects (more specifically, a vertical direction that is the arrangement direction of the first screen 20 and the second screen 21). As a result, as shown in FIG. 10, a range in which an image from the projector 4 is projected onto the first screen 20 (hereinafter referred to as a first projection range), and an image from the projector 4 onto the second screen 21. The ratio with the range (hereinafter referred to as the second projection range) is changed. Accordingly, the sizes and generation positions of the first virtual image 8A and the second virtual image 8B are also changed. Details will be described later.

  The HUD 1 basically has different types of images on the first screen 20 and the second screen 21 (for example, the first screen 20 is an image of the current vehicle speed of the vehicle, and the second screen 21 is guidance information or warning information). Image). Therefore, when the projection lens and the screen are in a one-to-one relationship as shown in the upper diagram of FIG. 10, the type of image projected for each projection lens is changed. On the other hand, when one projection lens projects onto a plurality of screens as shown in the lower diagram of FIG. 10, different types of images are projected from one projection lens to each screen to be projected.

  Each of the screen front / rear drive motor 24 and the screen vertical drive motor 25 is a stepping motor. Then, the HUD 1 can control the screen front / rear drive motor 24 based on the pulse signal transmitted from the control circuit unit 13 and appropriately position the front / rear position of the second screen 21 with respect to the set position. The HUD 1 controls the screen vertical drive motor 25 based on the pulse signal transmitted from the control circuit unit 13 and appropriately positions the vertical positions of the first screen 20 and the second screen 21 with respect to the set position. Is possible.

  On the other hand, the reflecting mirror 10 is a reflecting plate that reflects an image projected from the projector 4 to change the optical path and projects it onto the screen 5 as shown in FIG.

  Further, the mirror 11 is a projection unit that reflects the image light from the screen 5 and projects a virtual image 8 (see FIG. 1) in front of the occupant 7 through the front window 6 as shown in FIG. 2. As the mirror 11, a spherical concave mirror, an aspheric concave mirror, or a free-form curved mirror for correcting distortion of a projected image is used.

  The Fresnel lens 12 is a magnifying glass for generating a virtual image 8 by enlarging the image projected on the screen 5 as shown in FIG. And in HUD1 which concerns on this embodiment, the image | video projected on the screen 5 is further reflected on the front window 6 via the mirror 11 and the Fresnel lens 12, and is made to be visually recognized by the passenger | crew 7, so that the front of the front window 6 is visible. The image projected on the screen 5 at a distant position is enlarged and is visually recognized by the occupant as a virtual image 8 (see FIG. 1).

  The control circuit unit 13 is an electronic control unit that controls the entire HUD 1. Here, FIG. 11 is a block diagram showing the configuration of the HUD 1 according to the present embodiment.

  As shown in FIG. 11, the control circuit unit 13 includes a CPU 31 as an arithmetic device and a control device, a RAM 32 used as a working memory when the CPU 31 performs various arithmetic processes, a control program, and a virtual image generation described later. A ROM 33 in which a processing program (see FIG. 12) and the like are recorded, an internal storage device such as a flash memory 34 for storing a program read from the ROM 33 and a position setting table to be described later are provided. The control circuit unit 13 is connected to the projector 4, the lens drive motor 18, the screen front / rear drive motor 24, and the screen vertical drive motor 25, respectively, and performs drive control of the projector 4 and various motors.

  The CAN (controller area network) interface 14 is an interface for inputting / outputting data to / from CAN which is an in-vehicle network standard for performing multiplex communication between various on-vehicle devices installed in a vehicle and control devices for vehicle equipment. It is. The HUD 1 is connected to a control device (for example, the navigation device 48, the AV device 49, etc.) of various vehicle-mounted devices and vehicle equipment via the CAN so as to be able to communicate with each other. Accordingly, the HUD 1 is configured to be able to project output screens of the navigation device 48, the AV device 49, and the like.

  Next, a virtual image generation processing program executed by the CPU 31 in the HUD 1 having the above configuration will be described with reference to FIG. FIG. 12 is a flowchart of the virtual image generation processing program according to this embodiment. Here, the virtual image generation processing program is executed after the ACC of the vehicle is turned on, generates a virtual image that is visible to the user who is a vehicle occupant, and moves the screen based on the road shape ahead of the vehicle in the traveling direction. It is a program to be performed. Note that the program shown in the flowchart of FIG. 12 below is stored in the RAM 32 or ROM 33 provided in the HUD 1 and is executed by the CPU 31.

  First, in step (hereinafter abbreviated as “S”) 1 in the virtual image generation processing program, the CPU 31 transmits a signal to the projector 4 and starts projecting video onto the first screen 20 and the second screen 21 by the projector 4. To do. Here, the video projected by the projector 4 includes information related to the vehicle 2 and various types of information used for assisting the driving of the occupant 7. For example, warnings for obstacles (other vehicles and pedestrians), guidance information set by the navigation device and guidance information based on the guidance route (such as arrows indicating the direction of turning left and right), current vehicle speed, guidance signs, map images, traffic information, There are news, weather forecast, time, screen of connected smartphone, TV program and so on.

  In particular, in this embodiment, the image projected on the first screen 20 is an image of the current vehicle speed of the vehicle. The video projected on the second screen 21 is a video of guidance information based on the guidance route set by the navigation device. In the present embodiment, the second screen 21 is disposed below the first screen 20 as shown in FIG. Accordingly, as a result of reflection by the mirror 11, the second virtual image 8B that is a virtual image of the image projected on the second screen 21 is generated above the first virtual image 8A that is a virtual image of the image projected on the first screen 20. Will be.

  Therefore, as shown in FIG. 13, a numerical value indicating the current vehicle speed is generated as the first virtual image 8A in the vicinity of the lower edge of the front window 6 and in front of the front window 6, and is visible to the passenger. In addition, a guide arrow is generated as the second virtual image 8B in the vicinity of the center of the front window 6 and in front of the front window 6, and is visible to the passenger. Here, since the position of the first screen 20 is fixed, the position where the first virtual image 8A is generated (specifically, the generation distance L1 which is the distance from the occupant 7 to the first virtual image 8A) is also fixed. The position is 2.5 m ahead of the occupant 7. The generation distance L1 may be other than 2.5 m. However, if the generation distance L1 is too long, the first virtual image 8A is embedded in the road surface, and therefore it is preferably about 2 m to 4 m.

  In the example shown in FIG. 13, the current vehicle speed image is displayed as the first virtual image 8 </ b> A, but other information such as a guide sign, a map image, traffic information, news, weather forecast, time, connected It is good also as a structure which displays also the image | video of the information which does not need to displace the distance from vehicles, such as a smart phone screen and a television program. Then, by fixing the generation distance L1 to an appropriate distance (for example, 2.5 m), it is possible to prevent generation of an unnatural virtual image that is embedded in the road surface. Furthermore, the vehicle occupant can reduce the line-of-sight movement as much as possible when visually recognizing the first virtual image 8A, and can further reduce the burden during driving.

  On the other hand, the position where the second virtual image 8B is generated is a position ahead of the generation distance L2 from the vehicle, but the generation distance L2 can be arbitrarily set and changed within a range determined by the standard of HUD1. . In particular, in this embodiment, setting and changing are possible within a range of 2.5 mm to 20 mm. In addition, the generation distance L2 is desirably set as appropriate based on the content of the image projected on the second screen 21 (that is, the second virtual image 8B).

  For example, as shown in FIG. 13, when a guide arrow indicating a right / left turn is displayed as the second virtual image 8 </ b> B, the vehicle position or map information obtained from the navigation device for the distance from the occupant 7 to the intersection 60 to be turned left / right And the calculated distance is set as the generation distance L2. The HUD 1 according to the present embodiment can change the generation distance L2 by moving the second screen 21 in the front-rear direction along the optical path as described above (see FIG. 8). Accordingly, the CPU 31 controls the position of the second screen 21 so that the second virtual image 8B is generated at a position away from the occupant 7 by the generation distance L2. As a result, the position where the second virtual image 8B is generated is the position ahead of the generation distance L2 set by the occupant 7 (the position of the intersection 60 to be turned right in the example shown in FIG. 13). Therefore, it becomes possible to make the front scenery visually recognized by the occupant 7 correspond to the position of the second virtual image 8B, and the occupant 7 can minimize the movement of the line of sight even when viewing the second virtual image 8B. . In addition, if the distance from the passenger | crew 7 to the intersection used as the right-left turn changes by a vehicle moving after that, it will comprise so that the production | generation distance L2 may also be changed in connection with it. When the second screen 21 is moved, the second projection lens 17 is also moved in order to focus the image projected from the second projection lens 17 on the second screen 21.

  Hereinafter, the control of the positions of the second screen 21 and the second projection lens 17 will be described in more detail with reference to FIG. Here, the positions of the second screen 21 and the second projection lens 17 are configured to be movable along the optical path 52 of the light source 51 of the projector 4 as shown in FIG. Since the generation distance L2 depends on the distance from the mirror 11 to the second screen 21, the position of the second screen 21 corresponds to the generation distance L2 in which the distance from the mirror 11 to the second screen 21 is set. To be determined. A position setting table stored in the flash memory 34 is used for determining the position of the second screen 21. As shown in FIG. 15, the position setting table defines the position of the second screen 21 for generating the second virtual image 8B at the generation distance L2 for each generation distance L2.

  On the other hand, the position of the second projection lens 17 is determined as a position where the image projected from the second projection lens 17 is focused on the second screen 21. In other words, if the second screen 21 moves along the optical path in a direction away from the mirror 11 (that is, a direction approaching the second projection lens 17) in order to increase the generation distance L2, the second projection lens 17 follows the optical path. Therefore, it moves in a direction approaching the second screen 21 which is the opposite direction. On the other hand, if the second screen 21 moves along the optical path in a direction approaching the mirror 11 (that is, a direction away from the second projection lens 17) in order to shorten the generation distance L2, the second projection lens 17 follows the optical path. Therefore, it moves in the direction away from the second screen 21 which is the opposite direction. In other words, the position of the second screen 21 in the optical path 52 is first determined based on the set generation distance L2, and the position of the second projection lens 17 in the optical path 52 is determined based on the determined position of the second screen 21. Will be determined. In addition, the second projection lens 17 and the second screen 21 move in different directions along the optical path 52. The position setting table also predefines the position of the second projection lens 17 in association with the position of the second screen 21, and the position setting table is used to determine the position of the second projection lens 17. .

  As a result, for example, even when the second screen 21 is moved to the second projection lens 17 side in order to change the generation distance L2, the second projection lens 17 is also moved along with the movement of the second screen 21. By moving to the second screen 21 side, it is possible to maintain the state in which the projected image is focused on the second screen 21. As a result, a clear image can be projected even after the second screen 21 is moved.

  Next, in S <b> 2, the CPU 31 communicates with the navigation device 48 via the CAN interface 14, thereby acquiring the road shape ahead of the vehicle in the traveling direction from the map information stored in the navigation device 48.

  Subsequently, in S3, the CPU 31 determines whether or not there is an upward gradient in the forward direction of the vehicle (that is, the line of sight of the occupant 7) based on the current position of the vehicle and the road shape in the forward direction of the vehicle acquired in S2. To determine. The current position information of the vehicle is acquired from the navigation device 48 or the like.

  If it is determined that there is an ascending slope in the forward direction of the vehicle (that is, the sight line direction of the occupant 7) (S3: YES), the process proceeds to S4. On the other hand, if it is determined that there is no upward gradient in the forward direction of the vehicle (that is, the line of sight of the occupant 7) (S3: NO), the images on the first screen 20 and the second screen 21 are continued. Project.

  In S4, the CPU 31 acquires the gradient angle of the upward gradient determined to be in the forward direction of the vehicle (that is, the line-of-sight direction of the occupant 7) based on the road shape in the forward direction of the vehicle acquired in S2. Then, based on the acquired gradient angle, the amount of movement for moving the first screen 20, the second screen 21, and the screen front / rear drive motor 24 integrally in the direction crossing the optical path is determined. Specifically, the amount of movement is determined to increase as the gradient angle increases. The moving direction is the second projection range (the projector 4 with respect to the second screen 21) with respect to the first projection range (the range where the image from the projector 4 is projected onto the first screen 20) as the screen moves. The range in which the image from the image is projected is reduced, and in this embodiment, the vertical downward direction. Therefore, as the gradient angle of the upward gradient is larger, the ratio of the second projection range to the first projection range after the screen movement is smaller.

  Next, in S5, the CPU 31 drives the screen up / down drive motor 25 required to move the first screen 20, the second screen 21 and the screen front / rear drive motor 24 together by the amount of movement determined in S4. Determine the number of pulses.

  Thereafter, in S <b> 6, the CPU 31 transmits a signal to the projector 4 to reduce the projection range of a video (hereinafter referred to as a second video) projected from the projector 4 for the second screen 21. Specifically, as shown in FIG. 16, the projection range of the second image 62 is reduced in the vertical direction with the lower edge position fixed. On the other hand, the projection of the video (hereinafter referred to as the first video) projected from the projector 4 for the first screen 20 is continuously performed without being changed.

As a result, the shape and display position of the second virtual image 8B generated based on the second video 62 are changed by reducing the projection range of the second video 62 as shown in FIG. Specifically, the lower end of the space where the second virtual image 8B can be generated is moved upward from the ground surface. On the other hand, the shape and display position of the first virtual image 8A generated based on the first video 61 are not changed.
The image projected on the first screen 20 and the second screen 21 is reflected by the reflecting mirror 10, so that the generated virtual image is the image projected on the first screen 20 and the second screen 21. And the top, bottom, left and right are reversed. That is, in order to generate a virtual image of numbers and arrows as shown in FIG. 16, it is necessary to project an image obtained by inverting the numbers and arrows vertically and horizontally on the first screen 20 and the second screen 21. However, FIGS. 16 and 17 do not consider the inversion for the sake of easy explanation.

  Subsequently, in S7, the CPU 31 transmits to the screen vertical drive motor 25 a pulse signal for driving the screen vertical drive motor 25 by the drive amount determined in S5. As a result, as shown in FIG. 16, the first screen 20, the second screen 21, and the screen front / rear drive motor 24 start moving in a direction that intersects the optical path integrally.

  Subsequently, in S8, the CPU 31 determines whether or not the movement of the first screen 20 and the second screen 21 is completed. Specifically, it is determined that the movement of the first screen 20 and the second screen 21 is completed when a signal indicating that the drive is completed is received from the screen vertical drive motor 25 that transmitted the pulse signal in S7. .

  And when it determines with the movement of the 1st screen 20 and the 2nd screen 21 having been completed (S8: YES), it transfers to S9. On the other hand, when it is determined that the movement of the first screen 20 and the second screen 21 is not completed (S8: NO), the process waits until the movement is completed.

  In S9, the CPU 31 transmits a signal to the projector 4 to expand the projection range of the first video. Specifically, as shown in FIG. 17, the projection range of the first video 61 is enlarged in the vertical direction with the upper edge position fixed. On the other hand, the projection of the second video 62 is continuously performed without being changed.

  As a result, the shape and display position of the first virtual image 8A generated based on the first video 61 are changed by expanding the projection range of the first video 61 as shown in FIG. Specifically, the upper end of the space where the first virtual image 8A can be generated is moved upward from the ground surface, and the amount of information that can be displayed as the first virtual image 8A increases. As a result, for example, in addition to the current vehicle speed shown in FIG. 17, it is also possible to add and display information signs, map images, traffic information, news, weather forecasts, times, connected smartphone screens, TV programs, and the like. . The On the other hand, the shape and display position of the second virtual image 8B generated based on the second video 62 are not changed.

  And in HUD1 which concerns on this embodiment, as a result of performing the movement of the screen in S4-S9 and the change of the projection range, there is an ascending slope ahead in the traveling direction of the vehicle, and a part of the generated virtual image is in the ground. It is possible to prevent the range of usable virtual images from becoming narrow even in a situation where they are embedded and cannot be used. That is, the size of each space in which the first virtual image 8A and the second virtual image 8B can be generated is changed before and after the processing of S4 to S9 (see FIGS. 16 and 17), but the total size of the spaces. Can be prevented from decreasing.

  Subsequently, in S10, the CPU 31 finishes the ascending slope in the forward direction of the vehicle (that is, the line of sight of the occupant 7) based on the current position of the vehicle and the road shape in the forward direction of the vehicle acquired in S2. It is determined whether or not.

  If it is determined that the ascending slope in the forward direction of the vehicle (that is, the sight line direction of the occupant 7) has been completed (S10: YES), the process proceeds to S11. On the other hand, when it is determined that the ascending slope ahead of the traveling direction of the vehicle (that is, the sight line direction of the occupant 7) has not ended (S10: NO), the first screen 20 and the second screen continue. The image is projected onto the screen 21.

  In S11, the CPU 31 returns the projection range of the first video changed in S9 to the state before the change.

  Next, in S12, the CPU 31 drives the screen vertical drive motor 25 (the number of pulses) required to return the positions of the first screen 20 and the second screen 21 to the positions before the movement of S7 and S8. ).

  Subsequently, in S13, the CPU 31 transmits a pulse signal for driving the screen vertical drive motor 25 by the drive amount determined in S12 to the screen vertical drive motor 25. As a result, the first screen 20, the second screen 21, and the screen front / rear drive motor 24 integrally start moving in the direction opposite to S7 and S8.

  Subsequently, in S14, the CPU 31 determines whether or not the movement of the first screen 20 and the second screen 21 is completed. Specifically, it is determined that the movement of the first screen 20 and the second screen 21 is completed when a signal indicating that the drive is completed is received from the screen vertical drive motor 25 that transmitted the pulse signal in S13. .

  And when it determines with the movement of the 1st screen 20 and the 2nd screen 21 having been completed (S14: YES), it transfers to S15. On the other hand, when it is determined that the movement of the first screen 20 and the second screen 21 is not completed (S14: NO), the process waits until the movement is completed.

  Thereafter, in S15, the CPU 31 returns the projection range of the second video changed in S6 to the state before the change. As a result, the display mode of the virtual image by the HUD 1 returns to the state before detecting the upward gradient.

  As described above in detail, according to the HUD 1 according to the present embodiment, images are projected onto the first screen 20 and the second screen 21 via the projector 4, and are projected onto the first screen 20 and the second screen 21, respectively. By reflecting the captured image on the front window 6 of the vehicle 2 and causing the vehicle occupant 7 to visually recognize the image, a virtual image of the image viewed by the vehicle occupant 7 is generated. In addition, the position of the first screen 20 is fixed with respect to the optical path, and the second screen 21 is configured to be movable along the optical path using the screen front / rear drive motor 24 as a drive source. By driving, the first screen 20, the second screen 21, and the screen front / rear drive motor 24 are integrally moved in a direction intersecting the optical path (S4 to S9). While it is possible to generate a virtual image in various forms, it is possible to prevent the range of usable virtual images from becoming narrow even in a situation where the range in which virtual images can be used in the forward direction of the user's line of sight is limited Become. Therefore, it is possible to suppress the occurrence of an area that cannot be substantially used as an area for generating a virtual image in a range in which an image is projected onto the screen as much as possible, and to generate a virtual image using the screen more effectively.

Note that the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the scope of the present invention.
For example, in the present embodiment, the virtual image is generated in front of the front window 6 of the vehicle 2 by the HUD 1, but the virtual image may be generated in front of a window other than the front window 6. In addition, the object to be reflected by the HUD 1 may be a visor (combiner) installed around the front window 6 instead of the front window 6 itself. Further, as the projector 4, a projector other than a projector using an LED as a light source may be used.

  In the present embodiment, the HUD 1 is installed on the vehicle 2. However, the HUD 1 may be installed on a moving body other than the vehicle 2. For example, it can be installed on a ship or an aircraft. Moreover, you may install in the ride type attraction installed in an amusement facility. In that case, a virtual image can be generated around the ride so that the rider can visually recognize the virtual image.

  Further, in the present embodiment, when there is an ascending slope in the forward direction of the vehicle (that is, the line of sight of the occupant 7), the first screen 20, the second screen 21, and the screen front / rear drive motor 24 integrally intersect the optical path. Although it is configured to move in the direction, the same processing may be performed if the range in which the virtual image is generated is limited in front of the user's line-of-sight direction other than the ascending slope (for example, when traveling in a tunnel). .

  Further, even when there is a downward slope in front of the traveling direction of the vehicle (that is, the line-of-sight direction of the occupant 7), the first screen 20, the second screen 21, and the screen front / rear drive motor 24 are integrally moved in a direction intersecting the optical path. It is good also as a structure made to do. However, in this case, the direction in which the first screen 20, the second screen 21, and the screen front / rear drive motor 24 are moved is a vertically upward direction that is the reverse direction of the present embodiment. As a result, the generated virtual image can be generated at an appropriate position without a great distance from the ground surface.

  In the present embodiment, only the second screen 21 is configured to be movable in the front-rear direction along the optical path. However, the first screen 20 may be configured to be movable. Similarly, the first projection lens 16 may be configured to be movable. In that case, the generation distance L1 of the first virtual image 8A can be changed. Further, only the second screen 21 may be configured to be movable in the front-rear direction along the optical path, and the position of the second projection lens 17 may be fixed.

  In this embodiment, the screen is composed of two screens, a first screen 20 and a second screen 21, and the lens of the projector 4 is composed of two lenses, a first projection lens 16 and a second projection lens 17. However, the number of screens and lenses may be three pairs or more. Further, the projector 4 may have only one lens, and the screen may be composed of a plurality of sheets.

  Moreover, although the embodiment which actualized the head-up display device according to the present invention has been described above, the head-up display device can also have the following configuration, and in that case, the following effects can be obtained.

For example, the first configuration is as follows.
A head-up display device comprising: a screen; a projector that projects an image on the screen; and a virtual image generating unit that generates a virtual image of the image from the image projected on the screen. A road shape acquisition means including a screen and a second screen for acquiring a road shape in a viewing direction of a user who visually recognizes the virtual image; and at least one of the first screen and the second screen as an optical path of the projector A front-rear direction moving means for moving along the cross-direction, a cross-direction moving means for moving the first screen, the second screen, and the front-rear direction moving means integrally along a direction crossing the optical path; And the projector projects the video across the first screen and the second screen, Based on the road shape acquired by the road shape acquisition means, when it is determined that there is an ascending slope in the user viewing direction, the crossing direction moving means moves the first screen and the second screen to the optical path. The ratio of the second projection range for projecting the image to the second screen relative to the first projection range for projecting the image to the first screen is reduced by integrally moving along the direction intersecting It is characterized by that.
According to the head-up display device having the above-described configuration, it is possible to generate a virtual image in various forms by using a plurality of screens, while the range in which the virtual image can be used in front of the user's line-of-sight direction is limited. Even in the situation, it is possible to prevent the range of available virtual images from becoming narrow. Therefore, it is possible to suppress the occurrence of an area that cannot be substantially used as an area for generating a virtual image in a range in which an image is projected onto the screen as much as possible, and to generate a virtual image using the screen more effectively.
Further, by moving the first screen and the second screen in a direction intersecting the optical path, the shape and position of the virtual image generated based on the image projected on the first screen and the second screen are projected. It is possible to easily change the shape and position of the virtual image generated based on the captured video. Further, the total space in which a virtual image can be generated based on the video projected on each screen is not reduced.
Moreover, even when there is an upward gradient in the user's viewing direction, it is possible to prevent a part of the virtual image generated by changing the position where the virtual image is generated from being embedded in the ground.

The second configuration is as follows.
The first screen is a fixed screen that generates a virtual image of the image projected on the first screen at a position where the position is fixed in the direction along the optical path and the distance from the user is fixed. And the second screen is a moving screen that changes a distance from the user to a position where a virtual image of the image projected on the second screen is generated by moving along the optical path. Features.
According to the head-up display device having the above-described configuration, it is possible to simultaneously generate a plurality of virtual images at different distances on the first screen and the second screen, while the distance from the user is different on the second screen. When displaying images related to a plurality of objects such as obstacles and intersections as virtual images, a virtual image can be generated at an appropriate position according to the distance to each object.

The third configuration is as follows.
The lower end of the virtual image of the image projected on the second screen is moved upward from the ground surface by reducing the ratio of the second projection range to the first projection range.
According to the head-up display device having the above configuration, the virtual image generated by changing the position where the virtual image is generated to the direction away from the ground surface even when there is an upward gradient in the viewing direction of the user. It is possible to prevent a part from being embedded in the ground.

The fourth configuration is as follows.
The larger the gradient angle of the upper Ri gradient, characterized in that a smaller proportion of the second projection range for the first projection range.
According to the head-up display device having the above configuration, the position where the virtual image is generated can be changed according to the angle of the upward gradient. Accordingly, a part of the generated virtual image can be prevented from being embedded in the ground, and the virtual image can be generated at a position that is easy for the user to view without positioning the virtual image higher than necessary. It becomes.

DESCRIPTION OF SYMBOLS 1 Head up display apparatus 2 Vehicle 3 Dashboard 4 Projector 5 Screen 6 Front window 7 Crew 8 Virtual image 16 1st projection lens 17 2nd projection lens 18 Lens drive motor 20 1st screen 21 2nd screen 24 Screen front and rear drive motor 25 screen Vertical drive motor 31 CPU
32 RAM
33 ROM
34 Flash memory 51 Light source 52 Optical path

Claims (4)

Screen,
A projector that projects an image on the screen;
A virtual image generating means for generating a virtual image of the video from the video projected on the screen, and a head-up display device comprising:
The screen includes a first screen and a second screen,
Road shape acquisition means for acquiring the road shape in the viewing direction of the user who visually recognizes the virtual image;
A front-rear direction moving means for moving at least one of the first screen and the second screen along an optical path of the projector;
And the first screen and the second screen and the front-rear direction moving means, have a, a cross-direction moving means for moving together along a direction intersecting the optical path,
The projector projects the video across the first screen and the second screen,
Based on the road shape acquired by the road shape acquisition means, when it is determined that there is an upward gradient in the viewing direction of the user, the crossing direction moving means moves the first screen and the second screen to the optical path. The ratio of the second projection range for projecting the image to the second screen relative to the first projection range for projecting the image to the first screen is reduced by integrally moving along the direction intersecting A head-up display device. The first screen is a fixed screen that generates a virtual image of the image projected on the first screen at a position where the position is fixed in the direction along the optical path and the distance from the user is fixed. Yes,
The second screen is a moving screen that changes a distance from the user to a position where a virtual image of the image projected on the second screen is generated by moving along the optical path. The head-up display device according to claim 1 . By reducing the ratio of the second projection range for the previous SL first projection range, according to claim 1, characterized in that to move the lower end of the virtual image of the image projected on the second screen upward from the ground surface Or the head-up display apparatus of Claim 2 . The larger the gradient angle of the front Symbol upslope, head-up display apparatus according to any one of claims 1 to 3, characterized in that a smaller proportion of the second projection range for the first projection range .

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