JP2010143411A - Head-up display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head-up display device for securing the safety of a vehicle. <P>SOLUTION: When a collision object 6 predicted to collide with a vehicle is detected, a display 12 is controlled to display an image as a warning image 50 which warns the existence of the collision object 6, while adjusting the imaging position of a virtual image 52 which is formed by projecting the warming image 50 displayed on the display 12 to a front wind shield 2 of the vehicle, to a position a set distance D of 8 m or longer apart from an average position P of the eyeball positions of an occupant 4 on a driver's seat 3 to superpose the virtual image 52 on a center view 60 of the occupant 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a head-up display device (hereinafter referred to as “HUD device”) as a vehicle display device.

2. Description of the Related Art Conventionally, an HUD device that displays an image displayed on a display device in a vehicle on a front windshield of the vehicle to display a virtual image of the image on the driver's seat side in the vehicle is known. In such a HUD device, for example, as disclosed in Patent Document 1, the visual position when the occupant is driving on the driver's seat of the vehicle is not obstructed with respect to the imaging position of the virtual image formed by projecting the display image onto the front windshield. It is adjusted to.
JP 2004-322680 A

  However, in the case of the HUD device of Patent Document 1, an occupant on the driver's seat changes the field of view from a real scene in front of about 40 to 50 m to a near virtual image when driving the host vehicle. You have to adjust the focus. Therefore, there has been a problem that a delay occurs in information transmission by displaying a virtual image. In particular, such a problem is desired to be solved in securing the safety of the host vehicle when a collision target where a collision is predicted is discovered.

  The present invention has been made in view of the problems described above, and an object thereof is to provide a head-up display device that ensures vehicle safety.

  The invention according to claim 1 is a HUD device that displays a virtual image of the image on the driver's seat side in the vehicle by projecting the image displayed on the display in the vehicle onto the front windshield of the vehicle. A collision target detection unit that detects a collision target that is predicted to collide, and when the collision target is detected by the collision target detection unit, the image that warns the existence of the collision target is displayed as a warning image. A warning display control means for controlling the display and a virtual image forming position obtained by projecting the warning image onto the front windshield are adjusted to a position separated from the occupant's eyeball position on the driver's seat with a set distance of 8 m or more. And an imaging position adjusting means for superimposing the virtual image on the center visual field of the occupant.

  According to the present invention, a virtual image formed by projecting a warning image that warns of the existence of a collision target that is predicted to collide with the host vehicle from the display unit to the front windshield is adjusted by adjusting the imaging position of the host vehicle. It is superimposed on the passenger's central vision on the seat. Here, in particular, the image formation position of the virtual image of the warning image is the distance from the occupant's eyeball position, with a set distance of 8 m or more at which the occupant's eye convergence angle becomes small and the occupant's focus adjustment is substantially unnecessary. It is adjusted to a position separated by a set distance. As a result, the occupant can visually recognize the virtual image of the warning image and the front real scene without adjusting the focus of the eyeball in the central field of view when the host vehicle is driven. Is less likely to occur. Therefore, when a collision target is detected, its presence can be quickly transmitted to the occupant, thereby contributing to ensuring vehicle safety.

  According to the second aspect of the present invention, the set distance, which is the distance from the occupant's eyeball position on the driver's seat at the virtual image formation position, is 8 m or more and 15 m or less. According to the present invention, the structure for forming a virtual image of the warning image at a position separated from the occupant's eyeball position by a set distance is reduced to a small size by a set distance of 15 m or less, and the actual scene in the central visual field by the occupant and Visual recognition of a virtual image can be realized without adjusting the focus by a set distance of 8 m or more. Therefore, it is possible to increase the degree of freedom of installation of the HUD device and ensure vehicle safety without depending on the vehicle type.

  According to the third aspect of the present invention, the imaging position detecting means sets the imaging position of the virtual image at a position where the depression angle is a set angle of 1 degree to 5 degrees with respect to the occupant's eyeball position on the driver's seat. adjust. According to the present invention, the virtual image of the warning image is obtained by adjusting the imaging position to a position where the depression angle with respect to the occupant's eyeball position is a set angle of 1 ° or more and 5 ° or less. It is appropriately superimposed on the central visual field while minimizing the influence on visual recognition. Thus, the occupant can instantly grasp the presence of a collision target by displaying a virtual image of a warning image while reliably viewing a real scene necessary for driving, so that the effect of ensuring vehicle safety can be enhanced.

  According to the fourth aspect of the present invention, the imaging position adjusting unit adjusts the imaging position of the virtual image between the position of the collision target detected by the collision target detection unit and the eyeball position. According to this invention, the virtual image of the warning image in which the imaging position is adjusted between the actual position of the collision target detected by the collision target detection means and the position of the occupant's eyeball on the driver's seat of the host vehicle is In the central visual field of the occupant, it can be displayed near the collision target. As a result, the occupant can correctly grasp not only the presence of the collision target but also the position thereof, so that the effect of ensuring vehicle safety can be enhanced.

  According to a fifth aspect of the present invention, an eyeball information acquisition unit that acquires information including an eyeball position as eyeball information relating to an eyeball state of an occupant on a driver's seat, and a central visual field based on the eyeball information acquired by the eyeball information acquisition unit Visual field estimation means for estimating, and the imaging position adjusting means adjusts the imaging position of the virtual image to a position separated from the eyeball position by a set distance in the eyeball information acquired by the eyeball information acquiring means, It is superimposed on the central visual field estimated by the visual field estimation means. According to the present invention, the central visual field on which the virtual image of the warning image is superimposed is estimated based on the occupant's eyeball information, and the virtual image forming position of the warning image is based on the estimated visual field and the eyeball position in the eyeball information. Therefore, the virtual image display without the focus adjustment corresponds to the eyeball state of the occupant. Therefore, it is possible to enhance the transmission effect of the existence of the collision target with respect to the occupant, and thus the effect of ensuring the vehicle safety.

  According to the sixth aspect of the invention, the eyeball information acquisition means has an eyeball sensor that detects the eyeball state of the passenger on the driver's seat, and acquires eyeball information related to the eyeball state from the detection result of the eyeball sensor. According to the present invention, the actual eyeball information of the occupant is acquired from the detection result by the eyeball sensor, and is used for estimation of the central visual field and adjustment of the imaging position of the virtual image. It will be accurate. Therefore, the virtual image of the warning image can be appropriately superimposed on the center visual field of the occupant to enhance the vehicle safety ensuring effect by displaying the virtual image.

  According to the seventh aspect of the present invention, the eyeball information acquisition means has an eyeball information memory for storing eyeball information, and acquires eyeball information from the eyeball information memory. According to this invention, the eyeball information stored in advance in the eyeball information memory is acquired from the memory and used for estimation of the central visual field and adjustment of the imaging position of the virtual image. Less processing is required for adjustment as a whole. Therefore, since the processing time from detection of the collision target until the virtual image of the warning image is superimposed on the central visual field can be shortened and the virtual image can be displayed quickly, the effect of ensuring vehicle safety can be enhanced.

  According to the invention described in claim 8, the warning display control means changes the display form of the warning image according to the collision probability with the collision target detected by the collision target detection means. According to the present invention, the display form of the warning image changes according to the collision probability with the collision target with respect to the host vehicle, so that the occupant who visually recognizes the virtual image of the warning image increases the collision probability due to the approach of the collision target or the like. Therefore, the effect of ensuring vehicle safety can be enhanced.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment.

(First embodiment)
FIG. 1 shows a schematic configuration of a HUD device 1 according to a first embodiment of the present invention. The HUD device 1 includes a display unit 10 and a control unit 30 and is mounted on a vehicle. Here, the display unit 10 installed in the instrument panel 5 of the vehicle includes a display 12, an optical system 14, and a drive unit 16.

  The display device 12 is composed of, for example, a liquid crystal monitor and has a screen 120 for displaying an image. The optical system 14 is formed by combining, for example, a mirror and a lens, and projects an image displayed on the screen 120 of the display 12 onto the front windshield 2 of the vehicle as an optical image. By this projection, the display image of the display device 12 is formed in front of the front windshield 2 and displayed as a virtual image on the driver's seat 3 side in the vehicle. Therefore, the occupant 4 on the driver's seat 3 can transmit information represented by the display image of the display 12 by visually recognizing the virtual image displayed in the front.

  The drive unit 16 includes a housing 160 that houses the display device 12 and the optical system 14, and an actuator 162 that adjusts an arrangement state such as an arrangement position and an arrangement angle of the housing 160. The actuator 162 includes, for example, an electric motor and a motion conversion mechanism, and can drive the housing 160 to an arbitrary position, angle, or the like. By adjusting the arrangement state of the housing 160 by such driving, the position (hereinafter simply referred to as “imaging position”) at which the optical system 14 forms an image on the display image of the display 12 is adjusted.

  The control unit 30 includes an eyeball information acquisition unit 32, a communication unit 34, an imaging unit 36, and a control circuit 38.

  The eyeball information acquisition unit 32 includes an eyeball sensor 320 and an analysis processing circuit 322. The eyeball sensor 320 is formed by combining a plurality of image sensors such as CCDs, for example, and is installed on the upper surface of the instrument panel 5 or the upper surface of the steering column. The eyeball sensor 320 captures at least the face of the occupant 4 on the driver's seat 3 and detects the eyeball state of the occupant 4.

  The analysis processing circuit 322 is made of, for example, an image processing IC chip or the like, and is installed in the vicinity of the display unit 10 of the vehicle and is electrically connected to the eyeball sensor 320. The analysis processing circuit 322 acquires eyeball information related to the eyeball state by continuously processing an image signal representing the detection result of the eyeball state by the eyeball sensor 320 at a predetermined frame rate. Here, the eyeball information is set in the present embodiment so as to include at least the eyeball position and the line-of-sight direction of the occupant 4 on the driver's seat 3. In particular, in the present embodiment, the average position and the average direction as a result of detecting the eyeball state within the set time (for example, 1 second) by the set number of times (for example, 30 times) for the eyeball position and the line-of-sight direction as the eyeball information, respectively. Adopted.

  The communication unit 34 includes an in-vehicle communication device 340 and an information processing circuit 342. The in-vehicle communication device 340 is formed by combining a plurality of wireless devices corresponding to the communication type, for example, and is installed in the vehicle so as to be able to communicate with the outside. Communication types include DSRC beacons, ETC beacons, road-to-vehicle communications using traffic infrastructure such as roadside cameras, inter-vehicle communications using in-vehicle communication devices of other vehicles, satellite communications using GPS, satellite cameras, etc. In addition, at least one of mobile communications using a mobile phone is adopted in the present embodiment. The in-vehicle communication device 340 receives a radio signal representing traffic information outside the host vehicle as needed, and performs amplification processing and demodulation processing on the signal.

  The information processing circuit 342 includes, for example, an IC chip for communication processing, and is installed near the display unit 10 of the vehicle and is electrically connected to the in-vehicle communication device 340. The information processing circuit 342 detects a collision target 6 (see, for example, FIG. 2) that is predicted to collide with the host vehicle by continuously processing a radio signal output from the in-vehicle communication device 340 with a predetermined sampling. The collision prediction information regarding the object 6 is acquired. Here, the collision target 6 includes, for example, a person or an animal outside the host vehicle, another vehicle, or the like. In addition, the collision prediction information is set in the present embodiment so as to include at least the presence position, the moving direction, and the moving speed of the detected collision target 6.

  The information processing circuit 342 according to the present embodiment further acquires traveling direction information regarding the planned traveling direction of the host vehicle traveling forward by continuous processing of radio signals from the in-vehicle communication device 340. Here, the planned traveling direction is, for example, a direction of a curve on a road where the host vehicle is traveling, or a destination specified by a navigation system (not shown) mounted on the host vehicle. Traveling direction, etc.

  The imaging unit 36 includes an external camera 360 and an image processing circuit 362. The external camera 360 is configured mainly with an image sensor such as a CCD, and is installed in the vicinity of the front bumper or the rearview mirror of the vehicle. The external camera 360 shoots an external region spreading forward of the vehicle as needed.

  The image processing circuit 362 includes, for example, an IC chip for image processing, and is installed near the display unit 10 of the vehicle and is electrically connected to the external camera 360. The image processing circuit 362 continuously processes the image signal representing the imaging result of the external field by the external camera 360 at a predetermined frame rate, thereby detecting the collision target 6 according to the information processing circuit 342 and detecting the collision prediction information. Acquire.

  The control circuit 38 is composed mainly of a microcomputer, for example, and has a memory 380. The control circuit 38 is installed in the vicinity of the display unit 10 of the vehicle, and includes the display 12, the actuator 162 of the drive unit 16, and the circuits 322, 342, and 362. Electrical connection. The control circuit 38 controls the display 12 and the actuator 162 of the drive unit 16 based on the acquired information of the circuits 322, 342, and 362 by executing a control program stored in the memory 380.

  In particular, when the collision target 6 is detected by at least one of the circuits 342 and 362 and the collision prediction information is acquired, the control circuit 38 according to the present embodiment converts the warning image 50 as illustrated in FIG. 3 into the virtual image 52 illustrated in FIG. The display of the image by the display 12 and the adjustment of the imaging position by the drive unit 16 are controlled so as to display. Hereinafter, the control flow in such a case will be described with reference to the flowchart shown in FIG. The control flow is programmed to start when the ignition switch of the vehicle is turned on and end when the switch is turned off. .

  First, in step S100 of the control flow, when the collision target 6 is detected by at least one of the information processing circuit 342 and the image processing circuit 362 while the host vehicle is traveling forward, the position of the collision target 6, the moving direction, It is determined whether or not the collision prediction information including the moving speed has been acquired. As a result, while the negative determination is made, step S100 is repeatedly executed. When the positive determination is made, the process proceeds to step S101.

  In step S <b> 101, the eyeball state of the occupant 4 on the driver's seat 3 of the host vehicle is detected by the eyeball sensor 320, and eyeball information related to the eyeball state is acquired by the analysis processing circuit 322. At this time, in this embodiment, as described above, eyeball information including the average position of the eyeball position and the average direction of the line-of-sight direction is acquired.

  Further, in the subsequent step S102, the central visual field shown in FIG. 2 is shown for the occupant 4 on the driver's seat 3 of the host vehicle based on the average position of the eyeball position and the average direction of the line of sight among the eyeball information acquired in step S101. 60 is estimated. Here, the central visual field 60 is, for example, around a viewpoint center 600 that exists in the average direction of the line-of-sight direction from the average position of the eyeball position, with a predetermined angle (generally about 20 from the average position of the eyeball position with respect to the average direction of the line-of-sight direction. In this embodiment, the field of view is estimated.

  In further subsequent step S103, the information processing circuit 342 acquires the traveling direction information related to the planned traveling direction of the host vehicle. Then, in subsequent step S104, based on the collision prediction information acquired in step S100 in addition to the traveling direction information acquired in step S103, the collision target 6 corresponding to the prediction information is compared with the own vehicle. It is determined whether or not the collision probability is equal to or higher than the set probability. Here, the collision probability indicates that when the host vehicle continues to travel forward in the traveling direction indicated by the traveling direction information and approaches the collision target 6, the host vehicle is separated from the target 6 due to a road curve or a blind spot. For example, in this embodiment, the probability of collision is calculated by a simulator executed on the control program. Further, the set probability is set to the most probable probability among the collision probabilities that require attention for ensuring the safety of the vehicle. For example, in this embodiment, the set probability is set to about 30%.

  While a negative determination is made in step S104, the process returns to step S100, and S100 and subsequent steps S101 to S104 are repeatedly executed. If an affirmative determination is made, the process proceeds to step S105. In step S105, the actuator 162 of the drive unit 16 is controlled so that the virtual image 52 of the warning image 50 displayed in the subsequent step S106 is superimposed on the central visual field 60 estimated in step S102 as shown in FIG. In addition, the imaging position of the virtual image 52 is adjusted.

  Specifically, in step S105, on the virtual line connecting between the position of the collision target 6 in the collision prediction information acquired in step S100 and the average position of the eyeball position in the eyeball information acquired in step S101, The imaging position of the virtual image 52 is adjusted. At this time, particularly in the present embodiment, as shown in FIG. 5, the eyeball position is separated from the average position P of the occupant 4 in the vehicle horizontal direction H with a set distance D and the depression angle with respect to the average position P is the set angle θ. The imaging position is adjusted to the position. The vehicle horizontal direction H is a direction along the horizontal plane of the host vehicle on the horizontal plane.

  Here, regarding the set distance D, the convergence angle φ (see FIG. 6) of the eyeball of the passenger 4 on the driver's seat 3 of the own vehicle is substantially 0 degrees as shown in FIG. The distance of 8 m or more is set so that the amount of focus adjustment is substantially 0 as shown in FIG. Furthermore, the set distance D is preferably set to a distance of 15 m or less so that the physique of the optical system 14 of the display unit 10 is made small enough to be mounted on various vehicles and the degree of freedom of installation of the HUD device 1 is increased. . In addition, with respect to the set angle θ of the depression angle, the virtual image 52 is displayed in the central visual field while minimizing the influence of the virtual image 52 on the front real scene viewed by the occupant 4 on the driver's seat 3 of the own vehicle in the central visual field 60. In order to properly superimpose on 60, it is set within the range of 1 degree to 5 degrees, more preferably about 3 degrees.

  In step S106 after the imaging position of the virtual image 52 is adjusted in this way, the warning image 50 whose form changes according to the collision probability calculated in step S103 by controlling the display 12 is displayed in FIG. As shown on the screen 120 of the display 12. Here, the warning image 50 is an image for warning and alerting the occupant 4 on the driver's seat 3 of the own vehicle of the presence of the collision target 6 corresponding to the collision prediction information acquired in step S100. It is stored in advance in the memory 380 as a plurality of image data corresponding to the change form. In particular, in this embodiment, the warning image 50 corresponding to the collision probability is read from the memory 380 and displayed so as to change the warning property as the collision probability increases.

  For example, a mode of changing the display color from yellow to red according to a traffic light or a mode of flashing the display to increase the flashing speed is adopted as the change mode that increases the warning performance. In step S106, in conjunction with the variable display of the warning image 50, the presence of the collision target 6 may be warned by voice by a voice output system (not shown) mounted on the vehicle.

  The virtual image 52 of the warning image 50 variably displayed in this way is a collision that is separated from the average position P of the eyeball position of the occupant 4 by a set distance D and the depression angle becomes the set angle θ in front of the front windshield 2. The image is formed in the vicinity of the object 6 and is superimposed on the central visual field 60 of the occupant 4 as shown in FIG. Here, in particular, in the present embodiment, the warning image 50 is displayed on the previously estimated central visual field 60 regardless of the eyeball state of the occupant 4 at the time of execution of step S106, for example, the looking aside in the traveling direction of the host vehicle. A virtual image 52 is superimposed.

  And in step S107 which transfers in the variable display state of the warning image 50, based on the collision prediction information and the traveling direction information acquired in steps S100 and S103, respectively, the collision target 6 corresponding to the collision prediction information and the own vehicle. It is determined whether or not the collision probability is less than the set probability. Here, the set probability is the same value as the value in step S103.

  While a negative determination is made in step S107, the process returns to step S105, and the S105 and subsequent steps S106 and S107 are repeatedly executed. If an affirmative determination is made, the process proceeds to step S108. In step S108, the display of the warning image 50 on the screen 120 of the display device 20 is stopped, the virtual image 52 of the image 50 is erased from the front of the front windshield 2, and then the process returns to step S100.

  According to the first embodiment described above, the warning image 50 is projected from the display unit 12 to the front windshield 2 when the collision target 6 that is predicted to collide with the host vehicle traveling forward is detected. The virtual image 52 is superimposed on the central visual field 60 of the occupant 4 driving the host vehicle. At this time, the imaging position of the virtual image 52 is separated from the average position P of the eyeball position of the occupant 4 with a set distance D of 8 m or more, and the collision target vicinity position having a depression angle of 1 to 5 degrees. Adjusted. As a result, the occupant 4 can reliably view the virtual image 52 of the warning image 50 and the collision target 6 in the front real scene that are close to each other in the central visual field 60 without adjusting the focus of the eyeball. Vehicle safety can be ensured by instantly grasping the position.

  In particular, the central visual field 60 is accurately estimated based on the eyeball information of the occupant 4 acquired from the detection result of the eyeball sensor 320, and the imaging position of the virtual image 52 is the estimated central visual field 60 and It is accurately adjusted based on the average position of the eyeball position in the eyeball information. According to this, it is possible to appropriately superimpose the virtual image 52 on the central visual field 60 reflecting the eyeball state of the actual occupant 4 and improve the transmission of the presence and position of the collision target 6 with respect to the occupant 4. The securing effect can be enhanced. Further, the display form of the warning image 50 that becomes the virtual image 52 on the display 12 is changed according to the collision probability between the host vehicle and the collision target 6, so that the passenger 4 is visually informed of the increase in the collision probability. Therefore, the effect of ensuring vehicle safety can also be enhanced.

  In the first embodiment so far, the communication unit 34 and the imaging unit 36 correspond to the “collision target detection unit” recited in the claims, and the control circuit 38 that executes step S106 of the control flow is claimed. The control circuit 38 that executes steps S105 and S106 of the control flow and the display unit 10 jointly correspond to the “imaging position adjusting unit” described in the claims. Is comprised. The eyeball information acquisition unit 32 corresponds to the “eyeball information acquisition unit” described in the claims, and the control circuit 38 that executes step S102 of the control flow includes the “field-of-view estimation unit” described in the claims. It is equivalent.

(Second embodiment)
The second embodiment of the present invention shown in FIG. 8 is a modification of the first embodiment. In 2nd embodiment, it replaces with the eyeball information acquisition part 32 of 1st embodiment, and the input device 1032 is provided.

  The input machine 1032 includes, for example, an input switch and a touch panel, and is installed around the driver's seat 3. The input device 1032 is operated by the occupant 4 on the driver's seat 3 and inputs physical information of the occupant 4 such as height, sitting height, etc., and generates an input signal representing the physical information.

  The control circuit 1038 of the second embodiment electrically connected to the input machine 1032 relates to the eyeball state of the occupant 4 on the driver's seat 3 in addition to substantially the same configuration and function as the control circuit 38 of the first embodiment. It has a function of estimating and storing eyeball information. Specifically, the control circuit 1038 ergonomically processes the input signal output from the input device 1032 when inputting physical information to estimate the position of the eyeball of the occupant 4 on the center line in the width direction of the driver's seat 3, The estimated eyeball position is stored in the memory 1380 as eyeball information. At the same time, the control circuit 1038 estimates the front direction of the vehicle horizontal direction starting from the estimated eyeball position as the sightline direction of the occupant 4 and stores the estimated sightline direction in the memory 1380 as eyeball information.

  As described above, in the second embodiment, body information is input to the input device 1032, and once the eyeball position and line-of-sight direction estimated by the control circuit 1038 are stored in the memory 1380 as eyeball information, the next input is performed. The eyeball information is held until this is performed. Therefore, in the control flow executed by the control circuit 1038 of the second embodiment, as shown in FIG. 9, in step S1101 instead of step S101 of the first embodiment, the eyeball position and line-of-sight direction as eyeball information are stored from the memory 1380. Will be acquired. Note that the eyeball position and the line-of-sight direction acquired in step S1101 are used in subsequent steps S102 and S105 as a substitute for the average position of the eyeball position and the average position of the line-of-sight described in the first embodiment.

  According to such a second embodiment, the eyeball information stored in advance according to the input to the input device 1032 is acquired from the memory 1380, the central visual field 60 is estimated in step S102, and the virtual image in step S105 is acquired. This is used for adjusting the image forming position 52. According to this, since the processing necessary for estimating the central visual field 60 and adjusting the imaging position of the virtual image 52 is reduced as a whole, the processing time from the detection of the collision target 6 in step S100 to the display of the virtual image 52 in step S106. And the effect of ensuring vehicle safety can be enhanced.

  In the second embodiment so far, the memory 1380 corresponds to the “eyeball information memory” described in the claims, and the control circuit 1038 that executes S1101 of the control flow includes the “eyeball” described in the claims. It corresponds to “information acquisition means”. Further, the control circuit 1038 that executes step S102 of the control flow corresponds to the “field-of-view estimation means” described in the claims, and the control circuit 1038 that executes step S106 of the control flow is described in “ Corresponding to “warning display control means”, the control circuit 1038 for executing steps S105 and S106 of the control flow and the display unit 10 together constitute the “imaging position adjusting means” described in the claims. Become.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and can be applied to various embodiments without departing from the scope of the present invention. it can.

  For example, in the control flow of the first and second embodiments, the imaging position of the virtual image 52 is set at a fixed position such as the viewpoint center 600 of the central visual field 60 estimated in step S102 regardless of the position where the collision target 6 exists. Step S105 may be executed to adjust.

  Further, in the second embodiment, without providing the input device 1032, the information on the line-of-sight direction or the central visual field 60 as the eyeball information and the eyeball position as the eyeball information are set in advance before the factory shipment of the HUD device 1. Alternatively, it may be stored in the memory 1380. In the case where the former is stored in the memory 1380 together with the eyeball position among the information on the line-of-sight direction and the central visual field 60, step S1101 is executed in the control flow similarly to the second embodiment. On the other hand, in the case where the latter is stored in the memory 1380 together with the eyeball position in the information on the line-of-sight direction and the central visual field 60, the acquisition of the visual line direction in step S1101 and the central visual field 60 in step S102 in the control flow. Estimation is not necessary.

It is a mimetic diagram showing a schematic structure of a HUD device by a first embodiment of the present invention. It is a mimetic diagram showing the front windshield in the state where the HUD device by a first embodiment of the present invention displayed the virtual image of the warning image ahead. It is a schematic diagram which shows the warning image displayed on the indicator of the HUD apparatus by 1st embodiment of this invention. It is a flowchart which shows the control flow which a control circuit implements in the HUD apparatus by 1st embodiment of this invention. It is a schematic diagram for demonstrating the control flow shown in FIG. It is a schematic diagram for demonstrating the control flow shown in FIG. It is a characteristic view for demonstrating the control flow shown in FIG. It is a schematic diagram which shows schematic structure of the HUD apparatus by 2nd embodiment of this invention. It is a flowchart which shows the control flow which a control circuit implements in the HUD apparatus by 2nd embodiment of this invention.

Explanation of symbols

1 HUD device, 2 front windshield, 3 driver's seat, 4 passengers, 6 collision target, 10 display unit (imaging position adjusting means), 12 display, 120 screen, 14 optical system, 16 drive unit, 160 housing, 162 Actuator, 20 Display, 30 Control unit, 32 Eyeball information acquisition unit (eyeball information acquisition unit), 320 Eye sensor, 322 Analysis processing circuit, 34 Communication unit (collision target detection unit), 340 In-vehicle communication device, 342 Information processing circuit 36, imaging unit (collision target detection means), 360 external camera, 362 image processing circuit, 38 control circuit (warning display control means / imaging position adjustment means / field of view estimation means), 380 memory, 50 warning image, 52 virtual image, 60 central field of view, 600 center of viewpoint, 1032 input device, 1038 control circuit Means - field estimating means, warning display control means, the image forming position adjusting means), 1380 memory (ocular information memory), D preset distance, H vehicle horizontal direction, theta set angle, phi angle of convergence

Claims (8)

A head-up display device that displays a virtual image of the image on the driver's seat side in the vehicle by projecting an image displayed on a display in the vehicle onto a front windshield of the vehicle,
A collision target detecting means for detecting a collision target predicted to collide with the vehicle;
Warning display control means for controlling the display so as to display the image that warns the existence of the collision target as a warning image when the collision target is detected by the collision target detection means;
The imaging position of the virtual image formed by projecting the warning image onto the front windshield is adjusted to a position on the driver's seat that is separated from the occupant's eyeball position by a set distance of 8 m or more, and the virtual image is adjusted to the occupant. An imaging position adjusting means for superimposing on the central field of view,
A head-up display device comprising:   The head-up display device according to claim 1, wherein the set distance is 8 m or more and 15 m or less.   3. The image formation position adjustment unit according to claim 1, wherein the image formation position adjustment unit adjusts the image formation position to a position where a depression angle with respect to the eyeball position is a set angle of 1 to 5 degrees. Head-up display device.   The imaging position adjusting means adjusts the imaging position between the position of the collision target detected by the collision target detection means and the eyeball position. A head-up display device according to claim 1. Eyeball information acquisition means for acquiring information including an eyeball position as eyeball information relating to the eyeball state of the occupant on the driver seat;
Visual field estimation means for estimating the central visual field based on the eyeball information acquired by the eyeball information acquisition means;
With
The imaging position adjusting means adjusts the imaging position to a position separated from the eyeball position by the set distance in the eyeball information acquired by the eyeball information acquiring means, and is estimated by the visual field estimating means. The head-up display device according to claim 1, wherein the head-up display device is superimposed on the central visual field.   The head according to claim 5, wherein the eyeball information acquisition unit includes an eyeball sensor that detects an eyeball state of an occupant on the driver seat, and acquires the eyeball information from a detection result of the eyeball sensor. Up display device.   The head-up display device according to claim 5, wherein the eyeball information acquisition unit includes an eyeball information memory that stores the eyeball information, and acquires the eyeball information from the eyeball information memory.   The said warning display control means changes the display form of the said warning image according to the collision probability with the said collision object detected by the said collision object detection means. The head-up display device described in 1.

Images