JP2015074391A - Head-up display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head-up display device capable of reliably causing a user to view and recognize an object.SOLUTION: An image is projected from a projector to a stationary first screen and a movable second screen, the image projected to the first screen and the second screen is reflected by a front window of a vehicle to allow a passenger of the vehicle to view and recognize the image and, thereby, a virtual image of the image viewed and recognized by the passenger of the vehicle is prepared. Further, when it is judged that movement of the second screen is not completed before the user and an object 61 get close to each other within a predetermined distance in the case where an alarm image 8B for the object 61 is generated as a virtual image, the screen as an object to which the image 8A for alarming the object 61 is projected from the interior of the first screen and the second screen is selected based on the positional relation of the object 61, the first screen and the second screen.

Description

  The present invention relates to a head-up display device that can be mounted on a moving body and generates various images that are visually recognized by a passenger of the moving body.

  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.

JP 2009-150947 A (page 5-6, FIG. 4)

  In addition, when warning or guidance to the vehicle occupant environment using a virtual image is given to the vehicle occupant, the position for generating the virtual image (more specifically, the distance from the occupant to the virtual image) should be set appropriately. is important. For example, when an object such as another vehicle or a pedestrian is located in the vicinity of the vehicle, in order to generate a warning virtual image for the object, a virtual image is generated at a position where the object actually exists. Is desirable. As a result, it becomes possible to make the user visually recognize the object.

  And in the technique of the said patent document 1, it is comprised so that the position of the screen used as the object which projects the image | video from a projector can move back and forth along an optical path, and the position (specifically, a virtual image is visually recognized visually). Adjusting the position from the user to the virtual image). As a result, by detecting the distance from the user to the object and moving the screen to a position corresponding to the detected distance, a virtual image can be generated at the position where the object actually exists. However, since a driving means such as a motor is used for moving the screen, for example, when the current screen position is far from the target position, a certain time corresponding to the moving distance is required to move the screen. Necessary.

  Therefore, when the object moves to the user side after appearing at a relatively close position from the user, the virtual image is moved while moving the screen to generate a virtual image at the position where the object exists, that is, There is a risk that the object will be close to the user before it is generated. As a result, there has been a problem that an appropriate warning cannot be given to the object.

  The present invention has been made in order to solve the above-described problems, and includes a fixed screen whose position is fixed in addition to a movable screen configured to be movable as a screen to be projected by a projector. Even if the moving screen cannot be moved in time, the head-up enables the user to reliably see the object by selectively warning the object using the moving screen and the fixed screen. An object is to provide a display device.

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. Further, the screen includes a first screen (20) and a second screen (21). The position of the first screen is fixed with respect to the optical path of the projector, and the first screen is positioned at a position fixed with respect to the optical path. It is a fixed screen which produces | generates the 1st virtual image which is a virtual image of the image | video projected on. On the other hand, a 2nd screen is a moving screen which changes the position where the 2nd virtual image which is a virtual image of the image projected on the 2nd screen with respect to an optical path is produced | generated by moving along an optical path. Further, the video is a video that warns an object in the vicinity of the user who visually recognizes the virtual image, and the distance acquisition means (31) for acquiring the distance from the user to the object and the distance acquired by the distance acquisition means. Based on the virtual image position determining means (31) for determining the position for generating the second virtual image, and the second screen is moved along the optical path to generate the second virtual image at the position determined by the virtual image position determining means. Screen moving means (31) to be moved, and movement determining means (31) for determining whether or not the movement of the second screen by the screen moving means is completed before the user and the object approach within a predetermined distance; If the movement determining means determines that the movement of the second screen by the screen moving means is completed before the user and the object are within a predetermined distance, the object is warned. The movement of the second screen by the screen moving means is not completed before the user and the object come within a predetermined distance by the first projecting means (31) that projects the image to be projected onto the second screen and the movement determining means. If it is determined, a screen to be a target for projecting an image for warning the object is selected from the first screen and the second screen based on the positional relationship between the object, the first screen, and the second screen. Projection target selection means (31) and second projection means (31) for projecting an image for warning the object on the screen selected by the projection target selection means.
The “object” includes signs, signs, intersections to be guided, and the like in addition to obstacles such as other vehicles and pedestrians.

  According to the head-up display device of the present invention having the above-described configuration, when generating a virtual image that warns an object, an image is projected onto a moving screen configured to be movable along the optical path of the projector. Thus, a virtual image can be generated at a position where the object actually exists. Even when the moving screen does not move in time and a virtual image cannot be generated at the position where the object actually exists, the moving screen and the fixed screen whose position is fixed with respect to the optical path are selectively used. By projecting an image using the method, it is possible to generate a virtual image at a position suitable for allowing the user to visually recognize the object before the object and the user approach each other. As a result, it becomes possible to make the user visually recognize the object.

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 a flowchart of the virtual image generation processing program which concerns on this embodiment. It is the figure which showed an example of the position setting table. It is the figure which showed the calculation method of 2nd required time. It is the figure which showed the movement aspect of the 2nd screen and the 2nd projection lens. It is the figure which showed an example of the virtual image visually recognizable from the passenger | crew of a vehicle. It is the figure which showed an example of the virtual image visually recognizable from the passenger | crew of a vehicle. It is the figure which showed an example of the virtual image visually recognizable from the passenger | crew of a vehicle.

  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 the image projected from the first projection lens 16 of the projector 4 is displayed as shown in FIG. 6. Is done. On the other hand, the 2nd screen 21 has the to-be-projected area 23 in which an image | video is projected below, and the image | video projected from the 2nd projection lens 17 of the projector 4 is displayed as shown in FIG. The first screen 20 and the second screen 21 are arranged at predetermined intervals in the front-rear direction along the optical path so that the projection areas 22 and 23 do not overlap as shown in FIGS. 2 and 6. 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 vertical drive motor 25 on the side surface of the first screen 20, the first screen 20 and the second screen 21 are integrally moved in a direction crossing the optical path as shown in FIG. It becomes possible. As a result, as shown in FIG. 10, the first projection mode in which the image from the projector 4 is projected on the first screen 20 and the second screen 21, and the image from the projector 4 is projected only on the first screen 20. It is possible to switch the projection mode of the image on the screen 5 between the second projection mode to be performed.

  When the projection mode is the first projection mode, the HUD 1 basically has different types of video images (for example, the first projection lens 16 presents the current vehicle state) between the first projection lens 16 and the second projection lens 17. The vehicle speed image and the second projection lens 17 project guidance information and warning information image) on each screen. On the other hand, when the projection mode is the second projection mode, one video (for example, the first projection lens 16) that is basically a combination of the images projected by the first projection lens 16 and the second projection lens 17. Then, the image on the lower half of the television screen is projected on the first screen 20 and the image on the upper half of the television screen is projected on the second projection lens 17. As a result, in the second projection mode, it is possible to generate a larger-size image without a dividing line as a virtual image. Even in the second projection mode, the first projection lens 16 and the second projection lens 17 may be configured to project different types of images.

  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 processing programs (see FIGS. 12 and 13) are recorded, and 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 FIGS. 12 and 13 are flowcharts of the virtual image generation processing program according to the present embodiment. Here, the virtual image generation processing program is executed after the vehicle ACC is turned on, and generates a virtual image 8 that warns the target object when there is a target object to be warned ahead of the traveling direction of the host vehicle. is there. The programs shown in the flowcharts of FIGS. 12 and 13 below are stored in the RAM 32 and the ROM 33 provided in the HUD 1 and executed by the CPU 31. In the following description, it is assumed that the image projection mode on the screen 5 is always in the first projection mode (FIG. 10).

  First, in step (hereinafter abbreviated as S) 1 in the virtual image generation processing program, the CPU 31 determines whether there is an object to be warned ahead of the traveling direction of the host vehicle. Here, there are signs, signs, intersections for guidance, etc. in addition to obstacles such as other vehicles and pedestrians as objects to be warned. An example of another vehicle that has performed the operation will be described. Therefore, in S1, the CPU 31 is configured to always detect the distance from the preceding vehicle with the distance measuring sensor, and when the distance changes at a predetermined amount or shorter at a time, another vehicle interrupts (that is, the own vehicle). It is determined that there is an object to be warned in front of the traveling direction. Further, when the direction indicator information of the other vehicle traveling in the lane adjacent to the lane in which the host vehicle travels is acquired and it is detected that the direction indicator on the lane side in which the host vehicle travels is detected, It may be determined that an interrupt has been performed.

  When it is determined that there is an object to be warned ahead of the traveling direction of the host vehicle (S1: YES), the process proceeds to S2. On the other hand, when it is determined that there is no object to be warned ahead of the traveling direction of the host vehicle (S1: NO), the virtual image generation processing program is terminated.

  In S <b> 2, the CPU 31 acquires the distance R from the occupant 7 to the object (the other vehicle that interrupted) based on the detection result of the distance measuring sensor or the like. A configuration may be adopted in which the distance R is acquired using a captured image captured by the front camera instead of the distance measuring sensor.

  Next, in S <b> 3, the CPU 31 acquires the current vehicle speed of the host vehicle via the CAN interface 14. Further, the moving direction and moving speed of the object are acquired based on the detection results of the distance measuring sensor, the front camera, and the like. The vehicle speed of the host vehicle also corresponds to the movement speed of the occupant 7.

  Subsequently, in S4, the CPU 31 determines that the occupant 7 is based on the distance R from the occupant 7 acquired in S2 to the object, the current vehicle speed of the host vehicle acquired in S3, the moving direction of the object, and the moving speed. A time (first required time) T1 required to approach the object is calculated. Specifically, when it is assumed that the occupant 7 and the object have moved at the current moving direction and speed, respectively, when the position of the occupant 7 and at least a part of the position of the object overlap, or the mutual distance is When it becomes extremely short (for example, within 3 m), it is determined that the occupant 7 is close to the object. When it is determined that the occupant 7 and the object are not close to each other (for example, when the speed of the interrupting vehicle is higher than that of the own vehicle), T1 is set to ∞.

  Next, in S5, the CPU 31 determines whether or not the distance R acquired in S2 is 20 m or less. Note that the distance serving as the determination criterion in S5 is determined by the standard of HUD1, and specifically, is the longest generation distance L2 at which the second virtual image 8B can be generated by HUD1. As described above, in the present embodiment, the second screen 21 is moved in the front-rear direction along the optical path to generate the second virtual image 8B that is a virtual image of the image projected on the second screen 21 (specifically, Can change the generation distance L2) that is the distance from the occupant 7 to the second virtual image 8B (see FIG. 8). When the second screen 21 is moved most toward the projector 4, the generation distance L2 is the longest. And when the longest generation distance L2 which can produce | generate the 2nd virtual image 8B by HUD1 is 20 m, the criterion of said S5 will be 20 m. On the other hand, when the longest generation distance L2 at which the second virtual image 8B can be generated by the HUD 1 is 30 m, the determination criterion in S5 is 30 m. In the following example, it is assumed that the longest generation distance L2 that can generate the second virtual image 8B by the HUD 1 is 20 m.

  And when it determines with the distance R acquired by said S2 being 20 m or less (S5: YES), it transfers to S6. On the other hand, when it is determined that the distance R acquired in S2 is longer than 20 m (S5: NO), the process proceeds to S7.

  In S6, the CPU 31 sets the target generation distance De, which is the target value of the generation distance L2 of the second virtual image 8B, to the distance R acquired in S2. On the other hand, in S7, the CPU 31 sets the target generation distance De, which is the target value of the generation distance L2 of the second virtual image 8B, to 20 m which is the maximum distance. Thereafter, the CPU 31 controls the position of the second screen 21 so that the second virtual image 8B is generated at a position separated from the occupant 7 by the target generation distance De set in S6 or S7 as described later.

  Subsequently, in S8, the CPU 31 moves the second screen 21 from the current position of the second screen 21 to a position where the second virtual image 8B is generated at a position separated by the target generation distance De set in S6 or S7. A time (second required time) T2 required for the movement is calculated.

Details of the process of S8 will be described below with reference to FIGS.
First, the CPU 31 reads the position setting table from the flash memory 34, and acquires the position of the second screen 21 when the second virtual image 8B is generated at a position separated by the target generation distance De. In the position setting table, as shown in FIG. 14, the position of the second screen 21 for generating the second virtual image 8B at the generation distance L2 is defined for each generation distance L2. Next, the CPU 31 needs to move the second screen 21 to move the second screen 21 from the current position of the second screen 21 to a position where the second virtual image 8B is generated at a position separated by the target generation distance De. Calculate the distance. For example, as shown in FIG. 15, when the current position of the second screen 21 is X and the position of the second screen 21 that generates the second virtual image 8B at a position separated by the target generation distance De is Y. Calculates the distance D from the position X to Y as the movement distance. Thereafter, the second required time T2 is calculated based on the moving speed of the second screen 21 and the moving distance of the second screen 21 that are determined in advance based on the specifications of the screen front / rear drive motor 24.

  Next, in S <b> 9, the CPU 31 determines whether or not the second required time T <b> 2 is ½ or less of the first required time T <b> 1, that is, the occupant 7 and the object are a predetermined distance (the predetermined distance is the object for the occupant 7. It is determined whether or not the movement of the second screen 21 is completed before approaching within (within the relative position and relative speed). Note that the ratio serving as the determination criterion in S9 may be a ratio other than 1/2, for example, 2/3 or 1/3. Further, the ratio may be changed depending on the type of object and the moving speed.

  And when it determines with 2nd required time T2 being 1/2 or less of 1st required time T1 (S9: YES), ie, before the passenger | crew 7 and a target object approach within a predetermined distance, When it is determined that the movement of the second screen 21 is completed, the process proceeds to S10. On the other hand, when it is determined that the second required time T2 is greater than ½ of the first required time T1 (S9: NO), that is, before the occupant 7 and the object approach within a predetermined distance. If it is determined that the movement of the second screen 21 is not completed, the process proceeds to S16 in FIG.

  In S10, the CPU 31 moves the positions of the second screen 21 and the second projection lens 17 so that the second virtual image 8B is generated at a position separated by the target generation distance De set in S6 or S7.

Details of the process of S10 will be described below with reference to FIG.
First, the CPU 31 reads the position setting table (FIG. 14) from the flash memory 34, and based on the target generation distance De set in S6 or S7, a position separated by the target generation distance De set in S6 or S7. Next, the position of the second screen 21 where the second virtual image 8B is generated (hereinafter referred to as the target movement position) is determined. Further, the CPU 31 also determines a position for moving the second projection lens 17 based on the position setting table and the target movement position.

  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 is the target generation in which the distance from the mirror 11 to the second screen 21 is set in S6 or S7. It is determined to be a distance corresponding to the distance De.

  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. That is, the position of the second screen 21 in the optical path 52 is first determined based on the target generation distance De set in S6 or S7, and the second position in the optical path 52 is determined based on the determined position of the second screen 21. The position of the projection lens 17 is determined. In addition, the second projection lens 17 and the second screen 21 move in different directions along the optical path 52.

  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.

  Subsequently, the CPU 31 drives the screen front / rear drive motor 24 (the number of pulses) necessary to move the second screen 21 to the target movement position, and the lens drive motor necessary to move the second projection lens 17. 18 drive amounts (number of pulses) are determined.

  Thereafter, the CPU 31 transmits a pulse signal for driving the screen front / rear drive motor 24 by the determined drive amount to the screen front / rear drive motor 24. Similarly, a pulse signal for driving the lens driving motor 18 by the determined driving amount is transmitted to the lens driving motor 18. The screen front / rear drive motor 24 and the lens drive motor 18 that have received the pulse signal drive based on the received pulse signal. As a result, the second screen 21 moves to the target movement position where the second virtual image 8B is generated at a position separated by the target generation distance De set in S6 or S7, and the second projection lens 17 moves to the second projection lens 17 after the movement. 2 Move to a position where the image is focused on the screen 21.

  Next, in S <b> 11, the CPU 31 transmits a signal to the projector 4 and starts projecting an image by the projector 4 onto the second screen 21. Here, the image projected onto the second screen 21 in particular by the projector 4 in S11 is an image that warns the object determined to be ahead in the traveling direction of the host vehicle in S1. In the present embodiment, a frame surrounding the object is displayed as an image for warning the object. For the first screen 20, various images such as the current vehicle speed, guidance signs, map images, traffic information, news, weather forecast, time, connected smartphone screens, TV programs, etc. are displayed after the HUD 1 is activated. Depending on the state, it is projected as appropriate.

For example, FIG. 17 is a diagram illustrating an example of a virtual image generated when the interrupting vehicle 61 that is the object is located in front of the host vehicle.
As shown in FIG. 17, 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 frame surrounding the interrupting vehicle 61 that is the object 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. On the other hand, the position where the second virtual image 8B is generated is the position ahead of the target generation distance De set in S6 or S7 from the occupant 7 (that is, the position of the interrupting vehicle 61). Therefore, the occupant 7 can minimize the movement of the line of sight when visually recognizing the second virtual image 8 </ b> B, and can surely make the interrupting vehicle 61 visually recognizable.

  Thereafter, in S12, the CPU 31 determines whether or not the elapsed time t from the start of the projection of the warning video to the object by the projector 4 in S11 is equal to or longer than a predetermined time Y (for example, 5 seconds). The predetermined time Y can be changed as appropriate depending on the type of object and the moving speed.

  If it is determined that the elapsed time t from the start of the projection of the warning video to the object by the projector 4 is equal to or longer than the predetermined time Y (S12: YES), the projector 4 applies the object to the object. The projection of the warning video is finished (S13). Note that projection of images other than warnings to the object (for example, images of the current vehicle speed) continues.

  On the other hand, if it is determined that the elapsed time t from the start of projection of the warning video onto the target by the projector 4 is less than the predetermined time Y (S12: NO), the process proceeds to S14.

  In S14, the CPU 31 obtains again the distance R ′ from the occupant 7 to the object. The details are the same as S2, and the description is omitted.

  Next, in S15, the CPU 31 determines whether or not the difference between the distance R acquired in S2 and the distance R ′ acquired in S14 is equal to or greater than a predetermined distance X (for example, 2 m). The predetermined distance X can be changed as appropriate depending on the type of object and the moving speed.

  When it is determined that the difference between the distance R acquired in S2 and the distance R ′ acquired in S14 is equal to or greater than the predetermined distance X (S15: YES), the process proceeds to S3. Thereafter, the target generation distance De is newly set based on the newly acquired distance R ′ (S6, S7), and the second screen 21 is moved. As a result, as shown in FIG. 17, even if the distance from the occupant 7 to the object (interrupt vehicle 61 in FIG. 17) changes significantly, the second virtual image 8B is generated at the position of the object after the change. It becomes possible.

  On the other hand, when it is determined that the difference between the distance R acquired in S2 and the distance R ′ acquired in S14 is less than the predetermined distance X (S15: NO), the process proceeds to S12, and the current Continue projecting video.

  In S16, the CPU 31 determines the generation distance L1 that is the distance from the occupant 7 to the first virtual image 8A generated by the first screen 20, based on the current positions of the first screen 20 and the second screen 21, and the occupant. A generation distance L2 that is a distance from 7 to the second virtual image 8B generated by the second screen 21 is acquired. In the present embodiment, the generation distance L1 is fixed (2.5 m), and the generation distance L2 is uniquely determined by the position of the second screen 21 (2.5 m to 20 m).

  Next, in S17, the CPU 31 determines the first screen 20 and the second screen based on the distance R from the occupant 7 to the object acquired in S2 and the generation distance L1 and generation distance L2 acquired in S16. 21, it is determined whether or not the screen having a short distance from the object to the virtual image generated (that is, the screen capable of generating a virtual image at a position closer to the object) is the second screen 21.

  And when it determines with the screen with the short distance from a target object to the virtual image produced | generated being the 2nd screen 21 (S17: YES), it transfers to S18. On the other hand, when it is determined that the screen having a short distance from the object to the virtual image generated is the first screen 20 (S17: NO), the process proceeds to S22.

  In S <b> 18, the CPU 31 transmits a signal to the projector 4 and starts projecting an image by the projector 4 on the second screen. Here, the image projected onto the second screen 21 in particular by the projector 4 in S18 is an image that warns the object determined to be ahead in the traveling direction of the host vehicle in S1. In the present embodiment, a frame surrounding the object is displayed as an image for warning the object. For the first screen 20, various images such as the current vehicle speed, guidance signs, map images, traffic information, news, weather forecast, time, connected smartphone screens, TV programs, etc. are displayed after the HUD 1 is activated. Depending on the state, it is projected as appropriate.

  Subsequently, in S19, the CPU 31 starts moving the second screen 21 and the second projection lens 17 so that the second virtual image 8B is generated at a position separated by the target generation distance De set in S6 or S7. . The details of the movement process of the second screen 21 and the second projection lens 17 are the same as in S10, and a description thereof will be omitted.

  As a result, as shown in FIG. 18, a frame surrounding the interrupting vehicle 61 that is the target object 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 can be visually recognized by the passenger. . Here, the position where the second virtual image 8B is generated does not coincide with the position of the interrupting vehicle 61, but is as close as possible to the interrupting vehicle 61. Therefore, the occupant 7 can minimize the movement of the line of sight when visually recognizing the second virtual image 8 </ b> B, and can surely make the interrupting vehicle 61 visually recognizable. Furthermore, since the 2nd screen 21 is moved in the state which produced | generated the 2nd virtual image 8B, it becomes possible to approach the 2nd virtual image 8B gradually to the interruption vehicle 61 side. As a result, it is possible to gradually eliminate the deviation in the distance between the interrupting vehicle 61 and the second virtual image 8B.

  Thereafter, in S20, the CPU 31 determines whether or not the elapsed time t from the start of the projection of the warning video to the object by the projector 4 in S18 is equal to or longer than a predetermined time Y (for example, 5 seconds). The predetermined time Y can be changed as appropriate depending on the type of object and the moving speed.

  If it is determined that the elapsed time t from the start of the projection of the warning video onto the object by the projector 4 is equal to or longer than the predetermined time Y (S20: YES), the projector 4 applies the object to the object. The projection of the warning video is finished (S21). Note that projection of images other than warnings to the object (for example, images of the current vehicle speed) continues.

  On the other hand, when it is determined that the elapsed time t from the start of the projection of the warning video to the object by the projector 4 is less than the predetermined time Y (S20: NO), the projector 4 continues to the object. Project a warning image.

  On the other hand, in S <b> 22, the CPU 31 transmits a signal to the projector 4 and starts projecting an image by the projector 4 onto the first screen 20. Here, the image projected onto the first screen 20 in particular by the projector 4 in S22 is an image that warns the object determined to be ahead in the traveling direction of the host vehicle in S1. However, the image is different from the image projected on the second screen 21 in S11 and S18. Specifically, while the image of the frame surrounding the object is projected in S11 and S18, an icon for warning that the object is approaching is projected in S22. For the first screen 20, in addition to the above icons, the current vehicle speed, information sign, map image, traffic information, news, weather forecast, time, connected smartphone screen, TV program, etc. after the activation of the HUD 1 are displayed. Various images are appropriately projected according to the state of the vehicle.

  As a result, as shown in FIG. 19, an icon for warning the object is generated in the vicinity of the lower edge of the front window 6 and in front of the front window 6 together with a numerical value indicating the current vehicle speed as the first virtual image 8A. It becomes possible. The icon generation position is preferably the closest position to the interrupting vehicle 61 within the range in which a virtual image can be generated by the first screen 20. Moreover, you may comprise so that the distance to the interruption vehicle 61 and the direction of the interruption vehicle 61 may be shown with an icon. For example, the distance to the interrupting vehicle 61 may be indicated by the icon display color.

  Here, the position where the first virtual image 8 </ b> A is generated does not basically coincide with the position of the interrupting vehicle 61. However, as described above, the position where the first virtual image 8A is generated is on the passenger side of the second virtual image 8B regardless of the position of the second screen 21, and more specifically, 2.5 m away from the passenger 7. It becomes the position. That is, the position where the first virtual image 8 </ b> A is generally generated is a position closer to the occupant than the interrupting vehicle 61. Therefore, when the occupant 7 visually recognizes the first virtual image 8A on the near side, the interrupting vehicle 61 on the back side of the first virtual image 8A can also be included in the sight of the occupant 7. As a result, the interrupting vehicle 61 can be reliably recognized.

  Subsequently, in S23, the CPU 31 starts moving the second screen 21 and the second projection lens 17 so that the second virtual image 8B is generated at a position separated by the target generation distance De set in S6 or S7. . The details of the movement process of the second screen 21 and the second projection lens 17 are the same as in S10, and a description thereof will be omitted.

  Thereafter, in S24, the CPU 31 determines whether or not the movement of the second screen 21 is completed.

  And when it determines with the movement of the 2nd screen 21 having been completed (S24: YES), it transfers to S25. On the other hand, when it is determined that the movement of the second screen 21 has not been completed (S24: NO), the process proceeds to S26.

  In S <b> 25, the CPU 31 transmits a signal to the projector 4 and switches the projection target of the video that warns the target object from the first screen 20 to the second screen 21. That is, the projection of the image for warning the object on the first screen 20 is finished, and the projection of the image for warning the object on the second screen 21 is newly started. Here, the video that warns the object projected onto the second screen 21 is a frame surrounding the object. The details of the projection onto the second screen 21 are the same as in S11, and the description thereof is omitted.

  As a result, as shown in FIG. 19, an icon that warns the interrupting vehicle 61 is generated by the first virtual image 8A at the beginning of the appearance of the interrupting vehicle 61 as an object, while the movement of the second screen 21 is completed. The frame surrounding the interrupting vehicle 61 is generated as the second virtual image 8B, and is visible to the passenger. Here, the position where the second virtual image 8B is generated is a position ahead of the target generation distance De set in S6 or S7 from the occupant 7 (that is, the position of the interrupting vehicle 61). Therefore, the occupant 7 can grasp the presence of the object at the earliest possible timing by the icon generated by the first virtual image 8A, and can make the interrupting vehicle 61 visually recognized by the frame generated by the second virtual image 8B. Is possible.

  Thereafter, in S26, the CPU 31 determines whether or not the elapsed time t from the start of the projection of the warning video to the target by the projector 4 in S22 is equal to or longer than a predetermined time Y (for example, 5 seconds). The predetermined time Y can be changed as appropriate depending on the type of object and the moving speed.

  If it is determined that the elapsed time t from the start of the projection of the warning image onto the object by the projector 4 is equal to or longer than the predetermined time Y (S26: YES), the projector 4 applies the object to the object. The projection of the warning video is finished (S27). Note that projection of images other than warnings to the object (for example, images of the current vehicle speed) continues.

  On the other hand, if it is determined that the elapsed time t from the start of the projection of the warning video onto the object by the projector 4 is less than the predetermined time Y (S26: NO), the process returns to S24 and continues. A warning image is projected onto the object.

  As described above in detail, according to the HUD 1 according to the present embodiment, the projector 4 projects images on the first screen 20 and the second screen 21 via the first projection lens 16 and the second projection lens 17, respectively. The virtual image of the image visually recognized by the vehicle occupant 7 is generated by reflecting the image projected on the first screen 20 and the second screen 21 to the front window 6 of the vehicle 2 and causing the vehicle occupant 7 to visually recognize the image. Further, the second screen 21 is movable along the optical path, and the position where the second virtual image 8B, which is a virtual image of the image projected on the second screen 21 with respect to the optical path, can be changed. Then, the distance from the user to the object is acquired (S2), the position for generating the second virtual image 8B is determined according to the distance to the object (S6, S7), and the user and the object are within a predetermined distance. It is determined whether or not the movement of the second screen 21 is completed before approaching (S9). As a result, when it is determined that the movement of the second screen 21 is completed before the user and the target object approach within a predetermined distance, an image for warning the target is projected on the second screen 21 (S11). ). On the other hand, if it is determined that the movement of the second screen 21 is not completed before the user and the target object come within a predetermined distance, the positional relationship between the target object, the first screen 20 and the second screen 21. Is selected from the first screen 20 and the second screen 21 as a target for projecting a video for warning the target (S16, S17), and the target is warned to the selected screen. An image is projected (S18, S22). As a result, when generating a virtual image that warns the object, the image is projected onto the second screen 21 configured to be movable along the optical path of the projector 4, thereby the position where the object actually exists. It is possible to generate a virtual image. Further, even when the movement of the second screen 21 is not in time and a virtual image cannot be generated at the position where the object actually exists, the first screen 20 and the second screen 21 are selectively used. By projecting an image, a virtual image can be generated at a position suitable for allowing the user to visually recognize the object before the object and the user approach each other. As a result, it becomes possible to make the user visually recognize the object.

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.

  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.

  In the present embodiment, a frame surrounding the target object (FIG. 18) and an icon for warning the target object (FIG. 19) are projected on the screen as an image for warning the target object. Other images may be used as long as the images can be recognized by 7. For example, a warning sentence or the like may be projected.

  Further, in the present embodiment, an interrupting vehicle that has interrupted in front of the host vehicle is described as an example of an object to be warned by a virtual image, but other objects (for example, pedestrians, signboards, signs, It is good also as a structure which performs the warning with respect to the intersection etc. which become guidance object. Moreover, as a warning with respect to the intersection used as guidance object, it is set as the structure which produces | generates the arrow which shows a guidance direction as a virtual image, for example.

  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, as the light source of the projector 4, a lamp or a laser may be used in addition to the LED.

  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.
The position where the first virtual image is generated is characterized by being closer to the user side than the second virtual image along the optical path regardless of the position of the second screen.
According to the head-up display device having the above configuration, it is possible to basically generate the first virtual image on the user side relative to the target object by projecting an image on the first screen regardless of the position of the second screen. Become. Therefore, if a video for warning the object is projected on the first screen, when the user visually recognizes the first virtual image on the near side, the object behind the first virtual image is also displayed. It can be included in the user's field of view. Therefore, it is possible to make the target object visible with certainty.

The second configuration is as follows.
The movement determination means calculates a first required time until the user and the object come close based on the relative speed and relative position of the object with respect to the user, and the current position of the second screen and the virtual image position determination means Based on the determined position of the second virtual image, a second required time required for moving the second screen by the screen moving means is calculated, and the second required time is equal to or less than a predetermined ratio of the first required time. It is determined that the movement of the second screen by the screen moving means is completed before the user and the object approach within a predetermined distance.
According to the head-up display device having the above configuration, it is possible to accurately determine whether or not the movement of the second screen can be completed before the user and the object approach within a predetermined distance. Therefore, it is possible to issue a warning in an appropriate manner according to the degree of warning required for the object.

The third configuration is as follows.
The projection target selection means selects a screen having a short distance from the target object to the virtual image generated from the first screen and the second screen.
According to the head-up display device having the above-described configuration, it is not possible to generate a virtual image of an image that warns the object at a position that matches the position of the object, but generates the virtual image at a position as close as possible to the object. It becomes possible to do. Therefore, the user can reduce the line-of-sight movement as much as possible when visually recognizing the virtual image, and can surely visually recognize the object.

The fourth configuration is as follows.
When the second screen is selected by the projection target selecting unit, the screen moving unit starts moving the second screen, and the second projecting unit starts projecting an image on the moving second screen. It is characterized by that.
According to the head-up display device having the above-described configuration, it is impossible to generate a virtual image of an image that warns the object at a position that matches the position of the object, but the second screen is moved in a state where the virtual image is generated. Therefore, it becomes possible to gradually bring the virtual image closer to the object side. As a result, it is possible to gradually eliminate the deviation of the distance between the object and the virtual image.

The fifth configuration is as follows.
When the first screen is selected by the projection target selecting unit, the second screen is moved by the screen moving unit, and the projection of the video by the second projecting unit is started on the first screen. The projection means is characterized in that after the movement of the second screen by the screen moving means is completed, the projection target of the image is changed from the first screen to the second screen.
According to the head-up display device having the above configuration, it is possible to allow the user to grasp the presence of the target object at the earliest possible timing by projecting an image on the first screen when the target object appears. It becomes. On the other hand, after the movement of the second screen is completed, it is possible to generate a virtual image at a position where the object actually exists by projecting an image on the second screen. As a result, it is possible to make the target object visible with certainty.

The sixth configuration is as follows.
The first projecting means and the second projecting means are characterized in that the contents of the image are different depending on whether the image for warning the object is projected on the first screen or the second screen. .
According to the head-up display device having the above configuration, the content of the virtual image is changed based on the positional relationship between the target object and the virtual image that warns the target object. Thus, it is possible to generate a virtual image with appropriate contents for allowing the user to recognize the object.

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 (7)

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,
The position of the first screen is fixed with respect to the optical path of the projector, and the fixed screen generates a first virtual image that is a virtual image of the image projected on the first screen at a position fixed with respect to the optical path. And
The second screen is a moving screen that moves along the optical path to change a position where a second virtual image, which is a virtual image of the video projected on the second screen, is generated with respect to the optical path. ,
The video is a video that warns an object around a user who visually recognizes the virtual image,
Distance acquisition means for acquiring a distance from the user to the object;
Virtual image position determining means for determining a position for generating the second virtual image based on the distance acquired by the distance acquiring means;
Screen moving means for moving the second screen along the optical path to generate the second virtual image at a position determined by the virtual image position determining means;
A movement determining means for determining whether or not the movement of the second screen by the screen moving means is completed before the user and the object approach within a predetermined distance;
Video that warns the object when the movement determining unit determines that the movement of the second screen by the screen moving unit is completed before the user and the object approach within a predetermined distance. First projecting means for projecting the image onto the second screen;
When it is determined by the movement determining means that the movement of the second screen by the screen moving means is not completed before the user and the object approach within a predetermined distance, the object and the first object A projection target selection means for selecting a screen to be projected from the first screen and the second screen based on the positional relationship between the first screen and the second screen;
A head-up display device comprising: second projection means for projecting an image for warning the object on the screen selected by the projection target selection means.   2. The head-up according to claim 1, wherein the position where the first virtual image is generated is closer to the user side than the second virtual image along the optical path, regardless of the position of the second screen. Display device. The movement determination means includes
Based on the relative speed and relative position of the object with respect to the user, a first required time until the user and the object come close to each other is calculated,
Based on the current position of the second screen and the position of the second virtual image determined by the virtual image position determining means, a second required time required for the movement of the second screen by the screen moving means is calculated,
When the second required time is less than or equal to a predetermined ratio of the first required time, the second screen is moved by the screen moving means before the user and the object approach within a predetermined distance. The head-up display device according to claim 1, wherein the head-up display device is determined to be completed.   4. The projection target selection unit selects a screen having a short distance from the object to the virtual image generated from the object among the first screen and the second screen. The head-up display device according to any one of the above.   When the second screen is selected by the projection target selection unit, the screen moving unit starts moving the second screen, and the second projecting unit applies the second screen to the moving second screen. The head-up display device according to claim 1, wherein projection of the video is started. When the first screen is selected by the projection target selecting unit, the second screen is moved by the screen moving unit and the video by the second projecting unit is started with respect to the first screen. Start projecting,
The said 2nd projection means changes the projection object of the said image | video from the said 1st screen to the said 2nd screen after the movement of the said 2nd screen by the said screen movement means is completed. The head-up display device according to claim 1.   The first projecting unit and the second projecting unit differ in the content of the video depending on whether the video that warns the object is projected on the first screen or the second screen. The head-up display device according to claim 1, wherein the head-up display device is a head-up display device.

Images