JP6711291B2 - Vehicle heads up display - Google Patents

Description

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

2. Description of the Related Art As a vehicle head-up display, there is known a vehicle including a light emitting unit that emits information as a light beam, and the light beam from the light emitting unit is reflected by a plurality of reflecting mirrors and projected onto a windshield glass of the vehicle. A driver of a vehicle provided with such a head-up display can see a virtual image of the information at a position distant forward from the projection position of the information on the windshield glass. The distance from the projection position of the information on the windshield glass to the position where the virtual image of the information can be seen (hereinafter referred to as depth) is the light ray from the light emitting portion to the projection position of the information on the windshield glass. Is equal to the length of.

The driver of the vehicle may alternately see the front of the vehicle and the virtual image of the above information on the head-up display. In this case, in order to reduce the tiredness of the driver's eyes, it is preferable to reduce the change in the focal position on the line of sight of the driver in the front-back direction. Then, in order to reduce the change in the focus position on the line of sight of the driver, it is conceivable to increase the length of the light beam in the head-up display to increase the depth of the virtual image of the information. However, in order to increase the length of the light rays in the head-up display, it is necessary to increase the number of reflecting mirrors and increase the number of reflections of the light rays from the viewpoint of the installation location, but the number of reflecting mirrors is increased. Also, there is a limit in increasing the number of reflections of light rays.

Further, as a head-up display capable of increasing the length of the light beam without taking a place for installation, for example, a head-up display using an optical fiber as disclosed in Patent Document 1 can be cited. This head-up display is provided with an optical fiber having one end connected to a light emitting part and transmitting a light beam from the light emitting part, and the other end of the optical fiber provided to project the light beam onto a windshield glass. And a projection unit that In this case, the light beam can be lengthened by lengthening the optical fiber, and by setting the optical fiber in a wound state, it is possible to save the installation place.

JP-A-8-108773

By the way, the direction in which the driver's line of sight changes frequently in the vertical direction and the width direction of the vehicle depending on the state of the vehicle. Therefore, depending on the condition of the vehicle, the direction in which the driver directs his or her eyes and the position where the virtual image of the above information can be seen on the head-up display are largely different from each other, and the driver alternates between the front of the vehicle and the above virtual image of the above information. There is a problem that the amount of movement of the line of sight increases when looking.

An object of the present invention is to provide a vehicle head-up display that can reduce the amount of movement of the line of sight when the driver alternately sees the front of the vehicle and a virtual image of information by the head-up display.

Hereinafter, the means for solving the above problems and the effects thereof will be described.
A vehicle head-up display that solves the above-mentioned problems is a light emitting unit that generates information as a light beam, an optical fiber having one end connected to the light emitting unit and transmitting the light beam, and the other end of the optical fiber. And a projection unit that is provided in the unit and projects the light beam onto the windshield glass of the vehicle. Further, the head-up display includes a displacement device that displaces the projection unit so that the projection position of the light beam on the windshield glass is changed.

According to this configuration, the driver of the vehicle can see the virtual image of the information at a position distant from the projection position of the information (light ray) on the windshield glass toward the front. The position where this virtual image is seen changes according to the projection position of the above information (light ray) on the windshield glass. Therefore, by displacing the projection unit through the displacement device, it is possible to change the position where the virtual image of the information is visible to the driver. Then, by displacing the projection unit through the displacing device so that the position where the virtual image of the information can be seen changes in the direction in which the line of sight of the driver who is looking ahead of the vehicle changes, the driver heads up in front of the vehicle. It is possible to reduce the amount of movement of the line of sight when alternately viewing the virtual image of information on the display.

It is conceivable that the head-up display includes a control unit that controls the displacement device according to a vehicle condition related to movement of the line of sight of the driver of the vehicle.
According to this configuration, when a vehicle situation in which the driver's line of sight moves occurs, by controlling the displacement device in accordance with the vehicle situation, the virtual image of the information can be seen in the direction in which the driver's line of sight is directed. It is possible to displace the projection unit so that the position changes. By displacing the projection unit in this manner, the position where the virtual image of the information can be seen can be rapidly changed in the direction in which the driver's line of sight is facing.

In the head-up display, it is conceivable that the displacement device rotates the projection unit in the vehicle width direction so that the projection position of the light beam on the windshield glass is changed at least in the vehicle width direction. In this case, it is conceivable that the vehicle condition related to the line of sight of the driver of the vehicle is the rotation direction and the rotation angle from the neutral position of the steering wheel in the vehicle. Then, the control unit controls the displacement unit so that the projection position of the light beam on the windshield glass is changed according to the rotation direction and the rotation angle from the neutral position of the steering wheel. Configured to rotate in a direction.

When the steering wheel is rotated clockwise from the neutral position, the driver of the vehicle moves the line of sight to the right side in the width direction of the vehicle, and the amount of movement of the line of sight at that time is used to increase the rotation angle from the neutral position of the steering wheel. Along with it. Further, when the driver rotates the steering wheel to the left from the neutral position, the driver moves the line of sight to the left side in the width direction of the vehicle, and the amount of movement of the line of sight at that time increases the rotation angle from the neutral position of the steering wheel. Along with it. According to the above configuration, when the steering wheel is rotated to the right by the predetermined rotation angle from the neutral position, the projection position of the light beam on the windshield glass corresponds to the predetermined rotation angle and the width of the vehicle is reduced. The projection unit can be rotated to the right in the width direction of the vehicle by controlling the displacement device so that the projection unit is changed to the right in the direction. Further, when the steering wheel is rotated leftward by a predetermined rotation angle from the neutral position, the projection position of the light beam on the windshield glass is changed to the left side in the vehicle width direction by an amount corresponding to the predetermined rotation angle. As described above, it is possible to rotate the projection unit to the left side in the width direction of the vehicle by controlling the displacement device. Then, by rotating the projection unit as described above, it is possible to change the position where the virtual image of the information can be seen in accordance with the moving direction and the moving amount of the line of sight accompanying the rotation of the steering wheel of the driver. As a result, the position where the virtual image of the above information can be seen moves in the direction in which the driver's line of sight is facing.

In the above head-up display, it is conceivable that the vehicle condition related to the line of sight of the driver of the vehicle includes the vehicle speed, and the control unit is configured as follows. That is, regarding the control unit, the projection unit of the vehicle is controlled by the displacement device so that the projection position of the light beam on the windshield glass is changed according to the rotation direction and the rotation angle from the neutral position of the steering wheel. When rotating in the width direction, the rotation amount of the projection unit is increased as the vehicle speed increases.

As the vehicle speed increases, the traveling direction of the vehicle changes greatly with respect to the rotation operation of the steering wheel, and thus the amount of movement of the line of sight of the driver accompanying the rotation of the steering wheel increases. According to the above configuration, when the projection unit is rotated in the width direction of the vehicle in accordance with the rotation of the steering wheel, the rotation amount of the projection unit is increased as the vehicle speed increases. Even if the amount of movement of the driver's line of sight when the steering wheel is rotated increases as the speed increases, the position where the virtual image of the information can be seen can be changed accordingly.

In the vehicle, it is conceivable that the headlamp is operated so that the optical axis of the headlamp is displaced in the width direction of the vehicle according to the rotation direction and the rotation angle from the neutral position of the steering wheel. ..

According to this configuration, since the headlamp is displaced according to the rotation direction and the rotation angle from the neutral position of the steering wheel, the vehicle is provided with a sensor or the like for detecting the rotation direction and the rotation angle of the steering wheel. ing. Therefore, in rotating the projection unit in the width direction of the vehicle in accordance with the rotation direction and the rotation angle from the neutral position of the steering wheel, the sensor and the like can be used.

The head-up display includes a plurality of optical fibers having different lengths as the optical fibers, and a switching operation is performed so that any one of the plurality of optical fibers is selected as an optical fiber for transmitting the light beam. It is conceivable to equip it with a device.

According to this configuration, through the switching operation of the switching device, by selecting any one of the plurality of optical fibers having different lengths as the optical fiber for transmitting the light beam, the above-mentioned information on the windshield glass from the light emitting unit is displayed. It is possible to change the length of the above-mentioned light rays up to the projection position. Then, by changing the length of the light beam, the distance (depth) from the projection position of the information on the windshield glass to the position where the virtual image of the information is visible can be changed. Therefore, when the driver changes the focus position on the line of sight toward the front of the vehicle in the front-rear direction of the vehicle according to the vehicle situation, it is possible to change the depth of the virtual image of the information in accordance with it. By changing the depth of the virtual image of the information in this way, when the driver alternately views the front of the vehicle and the virtual image of the information, the change in the front-back direction of the focal position on the line of sight of the driver is reduced. , It is possible to reduce the eyestrain of the driver.

The head-up display controls the displacement device according to a vehicle condition related to movement of the line of sight of the driver of the vehicle, and switches the switching device to a vehicle condition related to the focal position on the line of sight of the driver of the vehicle. It is conceivable to provide a control unit that controls according to the above.

According to this configuration, when the driver's line-of-sight focal position changes in a vehicle situation, the switching device is controlled according to the vehicle state to change the driver's line-of-sight focal position. It is possible to change the depth of the virtual image so that the position where the virtual image of the information can be seen changes in the direction. By changing the depth of the virtual image of the information in this way, the visible position of the virtual image of the information can be rapidly changed in the direction in which the focal position on the line of sight of the driver changes.

In the head-up display, the vehicle condition related to the change of the focus position on the line of sight of the driver of the vehicle is the vehicle speed, and as the vehicle speed is higher, the control unit causes the longer optical fiber to transmit the light beam. It is conceivable to control the switching device so that a fiber is selected.

As the vehicle speed increases, the focus position on the driver's line of sight when the driver looks ahead of the vehicle changes to the front side. According to the above configuration, as the vehicle speed becomes faster, the optical fiber having a longer length is selected as the optical fiber for transmitting the light rays. Therefore, as described above, the focus position on the line of sight of the driver is adjusted according to the increase in the vehicle speed. Even if it changes to the front side, it is possible to increase the depth of the virtual image of the information in accordance with it and change the visible position of the virtual image to the front side.

According to the present invention, it is possible to reduce the amount of movement of the line of sight when the driver alternately sees the front of the vehicle and the virtual image of information by the head-up display.

1 is a schematic diagram showing an entire vehicle to which a head-up display is applied. 1 is a schematic diagram showing the structure of a head-up display. The block diagram which shows the electric constitution of a head-up display. The flowchart which shows the operation procedure of a head-up display.

Hereinafter, an embodiment of a vehicle head-up display will be described with reference to FIGS.
A vehicle 1 shown in FIG. 1 has a steering wheel 2 operated by a user in a driver's seat and an optical axis of a headlamp 3 depending on a rotation direction and a rotation angle from a neutral position of the steering wheel 2 in a width direction of the vehicle 1. An actuator 4 for operating the headlamp 3 so that the headlamp 3 is displaced to a position, and a camera 5 for photographing the front of the vehicle 1 (the upper side in FIG. 1). Further, the vehicle 1 is provided with a head-up display 7 that generates information (vehicle speed and the like) as a light ray and projects the light ray onto the windshield glass 6 of the vehicle 1. A driver of the vehicle 1 provided with such a head-up display 7 can see a virtual image of the information at a position P2, which is separated from the projection position P1 of the information on the windshield glass 6 toward the front side.

As shown in FIG. 2, the head-up display 7 includes a light emitting unit 8 that generates the above information as a light beam, and a light beam whose one end is connected to the light emitting unit 8 through a switching device 12 to transmit the light beam. The fibers 9 and 10 and a projection unit 11 that is provided at the other end of the optical fibers 9 and 10 and projects the above-mentioned light rays onto the windshield glass 6 of the vehicle 1 are provided. The plurality of optical fibers 9 and 10 have different lengths, and the length of the optical fiber 10 is longer than the length of the optical fiber 9. Further, the switching device 12 performs a switching operation so that any one of the plurality of optical fibers 9 and 10 is selected as an optical fiber that transmits the light beam.

The distance from the projection position P1 of the above information by the head-up display 7 on the windshield glass 6 to the position P2 where the virtual image of the information is visible (hereinafter referred to as depth) is from the light emitting unit 8 to the above information on the windshield glass 6. It becomes equal to the length of the above-mentioned light rays up to the projection position P1. Therefore, when the optical fiber 10 is selected as the optical fiber for transmitting the light beam among the plurality of optical fibers 9 and 10, compared with the case where the optical fiber 9 is selected as the optical fiber for transmitting the light beam. The depth of the virtual image of the above information is increased.

The head-up display 7 includes a displacement device 13 that displaces the projection unit 11 so that the projection position P1 of the light beam on the windshield glass 6 is changed. The displacement device 13 includes a base member 15 that is displaceable in a direction of rotation around a rotation shaft 14 extending in the width direction of the vehicle 1, and a motor 16 that is driven to rotate the base member 15 around the rotation shaft 14. ,,. Further, the displacement device 13 is provided on the base member 15 and extends in the up-down direction, and a rotating body 18 that supports the projection unit 11 and is rotatable around the rotating shaft 17. And a motor 19 driven to rotate the rotating body 18 (projection unit 11) around the rotating shaft 17. The optical fibers 9 and 10 are wound around the outer peripheral surface of the rotating body 18, whereby the installation locations of the optical fibers 9 and 10 are kept small.

In the head-up display 7, when the rotating body 18 is rotated around the rotation axis 17 by driving the motor 19, the projection unit 11 changes the projection position P1 of the light beam on the windshield glass 6 in the width direction of the vehicle 1. The vehicle 1 rotates in the width direction. When the base member 15 is displaced in the direction of rotation around the rotation axis 14 by driving the motor 16, the projection unit 11 rotates in the vertical direction so that the projection position P1 of the light beam on the windshield glass 6 is changed up and down. To do.

Next, the electrical configuration of the head-up display 7 will be described.
The electronic control unit 20 shown in FIG. 3 is installed in the vehicle 1 and is for controlling various devices provided in the vehicle 1.

The electronic control unit 20 includes a detection signal from a vehicle speed sensor 21 that detects the vehicle speed based on the rotation of the drive system of the vehicle 1, a rotation angle sensor that detects the rotation direction and the rotation angle of the steering wheel 2 of the vehicle 1 with respect to the neutral position. The detection signal from 24 and the detection signal from the inclination angle sensor 22 that detects the inclination of the vehicle 1 with respect to the horizontal plane are input. Further, the electronic control unit 20 is provided with a navigation device 23 that provides the driver with support information for driving the vehicle 1 based on the video signal from the camera 5 and the map information and the current position of the vehicle 1. Support information (map information, current position, etc.) is input.

The electronic control unit 20 outputs command signals to drive circuits of various devices such as the actuator 4, the motors 16 and 19, the switching device 12, and the light emitting unit 8 based on the various input signals and information, and outputs the command signals. Control movements.

Specifically, when the driver rotates the steering wheel 2 from the neutral position, the electronic control unit 20 displaces the optical axis of the headlamp 3 (FIG. 1) in the width direction of the vehicle 1 according to the rotation direction and the rotation angle. The headlamp 3 is operated by driving the actuator 4 so as to operate. As a result, when the steering wheel 2 is rotated clockwise, the optical axis of the headlamp 3 is displaced to the right in the width direction of the vehicle 1 by an amount corresponding to the rotation angle of the wheel 2. On the other hand, when the steering wheel 2 is rotated counterclockwise, the optical axis of the headlamp 3 is displaced leftward in the width direction of the vehicle 1 by an amount corresponding to the rotation angle of the wheel 2.

The electronic control unit 20 (FIG. 3) operates the light emitting unit 8 to generate information such as vehicle speed detected by the vehicle speed sensor 21 and support information from the navigation device 23 as light rays. The light emitting unit 8 can change the color of the light beam generated at this time, and the electronic control device 20 can control the color of the light beam generated by the light emitting unit 8. ..

When the light emitting unit 8 generates the above information as a light beam, the light beam is transmitted by the optical fiber 9 or the optical fiber 10 shown in FIG. 2 and projected from the projection unit 11 to the projection position P1 on the windshield glass 6. At this time, the driver can see a virtual image of the information at a position P2 that is away from the projection position P1 toward the front. Further, the depth of the virtual image of the information at this time changes depending on whether the optical fiber 9 or the optical fiber 10 is selected as the optical fiber for transmitting the light beam. When the optical fiber 10 which is longer than the optical fiber 9 is selected, the depth of the virtual image of the above information becomes larger than when the optical fiber 9 is selected.

The electronic control unit 20 selects any one of the plurality of optical fibers 9 and 10 as an optical fiber that transmits the light beam according to the vehicle situation related to the change of the focus position on the line of sight of the driver of the vehicle 1. The switching device 12 is switched so as to be operated. The vehicle status related to the change of the focus position on the line of sight of the driver is, for example, the vehicle speed. The electronic control device 20 operates the switching device 12 so that the shorter optical fiber 9 is selected as the optical fiber for transmitting the light beam when the vehicle speed is less than the predetermined threshold value, while the vehicle speed is predetermined. When it is equal to or larger than the threshold value, the switching device 12 is operated so that the longer optical fiber 10 is selected as the optical fiber for transmitting the light beam.

At this time, the electronic control unit 20 functions as a control unit that controls the switching unit 12 according to the vehicle condition related to the change of the focus position on the line of sight of the driver, and further transmits the above-mentioned light rays as the vehicle speed increases. It functions as a control unit that controls the switching device 12 so that a long optical fiber is selected as the optical fiber.

The electronic control device 20 controls the motors 16 and 19 of the displacement device 13 according to the vehicle situation related to the movement of the line of sight of the driver of the vehicle 1. At this time, the electronic control device 20 plays a role as a control unit that controls the displacement device 13 in accordance with the vehicle situation related to the movement of the line of sight of the driver of the vehicle 1. Note that the vehicle conditions related to the movement of the driver's line of sight include, for example, the rotation direction and rotation angle from the neutral position of the steering wheel 2, the vehicle speed, and the inclination angle of the vehicle 1 with respect to the horizontal plane.

The electronic control unit 20 drives the motor 19 so as to change the projection position P1 of the light beam on the windshield glass 6 in accordance with the rotation direction and the rotation angle with respect to the neutral position of the steering wheel 2 and drives the projection unit 11 (rotating member). 18) is rotated around the rotation axis 17 in the width direction of the vehicle 1. At this time, the electronic control unit 20 controls the projection unit 11 to move the projection unit 11 to the vehicle 1 through the control of the displacement device 13 (motor 19) so that the projection position P1 is changed according to the rotation direction and the rotation angle from the neutral position of the steering wheel 2. Plays the role of a control unit that rotates the width direction of the.

When the steering wheel 2 is rotated to the right with respect to the neutral position, the electronic control unit 20 controls the motor 19 so that the projection position P1 moves to the right in the width direction of the vehicle 1 by an amount corresponding to the rotation angle of the wheel 2. The projection unit 11 (rotational body 18) is rotated through driving. When the steering wheel 2 is rotated counterclockwise with respect to the neutral position, the projection unit P1 is driven by the motor 19 so that the projection position P1 moves to the left side in the width direction of the vehicle 1 by an amount corresponding to the rotation angle of the wheel 2. 11 (rotating body 18) is rotated. Further, when rotating the projection unit 11 as described above, the electronic control unit 20 increases the rotation amount of the projection unit 11 as the vehicle speed increases.

The electronic control unit 20 drives the motor 16 to rotate the projection unit 11 (base member 15) so that the projection position P1 of the light beam on the windshield glass 6 is changed according to the inclination angle of the vehicle 1 with respect to the horizontal plane. Rotate around 14 up and down.

Specifically, when the vehicle 1 is tilted so that the front end of the vehicle 1 is above the horizontal plane, the motor is moved so that the projection position P1 moves upward by an amount corresponding to the tilt angle of the vehicle 1 at that time. The projection unit 11 (base member 15) is rotated through the driving of 16. When the vehicle 1 is tilted so that the front end of the vehicle 1 is below the horizontal plane, the motor is moved so that the projection position P1 moves downward by an amount corresponding to the tilt angle of the vehicle 1 at that time. The projection unit 11 (rotating body 18) is rotated through the driving of 19.

Next, the operation of the head-up display 7 will be described.
FIG. 4 is a flowchart showing an operation procedure of the head-up display 7. The electronic control unit 20 takes in the rotation direction and the rotation angle with respect to the neutral position of the steering wheel 2 detected by the rotation angle sensor 24 as the processing of step 101 (S101) of this flowchart, and the vehicle speed sensor 21 uses the vehicle speed as the processing of S102. Take in. Subsequently, the electronic control unit 20 takes in the tilt angle of the vehicle 1 detected by the tilt angle sensor 22 as the process of S103, and takes in the image taken by the camera 5 as the process of S104. Then, it progresses to S105.

The electronic control unit 20 selects either one of the optical fibers 9 and 10 as the optical fiber for transmitting the light beam according to the vehicle speed in the process of S105. Specifically, when the vehicle speed is less than the threshold value, the shorter optical fiber 9 is selected as the optical fiber that transmits the light beam. As a result, the depth of the virtual image of the information seen by the driver becomes smaller, in other words, the distance from the projection position P1 of the information on the windshield glass 6 to the position P2 where the virtual image of the information can be seen becomes shorter. On the other hand, when the vehicle speed is equal to or higher than the threshold value, the longer optical fiber 10 is selected as the optical fiber for transmitting the light beam. This increases the depth of the virtual image of the information seen by the driver, in other words, increases the distance from the projection position P1 of the information on the windshield glass 6 to the position P2 where the virtual image of the information can be seen.

Here, the focus position on the line of sight of the driver when the driver looks ahead of the vehicle 1 changes to the front side as the vehicle speed increases. Therefore, as described above, when the vehicle speed is a high value equal to or higher than the threshold value, the optical fiber 10 that is longer than the optical fiber 9 is selected as the optical fiber that transmits the light beam, so that the driver can increase the vehicle speed. Even if the focal position on the line of sight changes to the front side, the depth of the virtual image of the information is increased accordingly, and the position where the virtual image is visible changes to the front side.

On the other hand, when the vehicle speed is slow, the focus position on the driver's line of sight when the driver looks ahead of the vehicle 1 changes to the rear side of the vehicle 1 (closer to the vehicle 1 side). Therefore, as described above, when the vehicle speed is slower than the threshold value, by selecting the optical fiber 9 shorter than the optical fiber 10 as the optical fiber for transmitting the light beam, the driver can be adjusted according to the deceleration of the vehicle 1. Even if the focal position on the line of sight approaches the vehicle 1 side, the depth of the virtual image of the above information is reduced accordingly, and the position where the virtual image is visible changes to near the vehicle 1.

The electronic control unit 20 drives the motor 19 to move the projection unit 11 around the rotation axis 14 and the vehicle 1 according to the vehicle speed and the rotation direction and the rotation angle with respect to the neutral position of the steering wheel 2 as the process of S106. Rotate in the width direction.

Specifically, when the steering wheel 2 is rotated to the right with respect to the neutral position, the projection unit 11 is rotated so that the projection position P1 moves to the right in the width direction of the vehicle 1 by an amount corresponding to the rotation angle of the wheel 2. Furthermore, the rotation amount of the projection unit 11 at this time is increased as the vehicle speed increases. On the other hand, when the steering wheel 2 is rotated counterclockwise with respect to the neutral position, the projection unit 11 is rotated so that the projection position P1 moves to the left side in the width direction of the vehicle 1 by an amount corresponding to the rotation angle of the wheel 2. Furthermore, the rotation amount of the projection unit 11 at this time is increased as the vehicle speed increases.

Here, the driver of the vehicle 1 moves the line of sight to the right in the width direction of the vehicle 1 when the steering wheel 2 is rotated right from the neutral position, and at the same time, the amount of movement of the line of sight is adjusted to the neutral position of the steering wheel 2. It increases as the angle of rotation from increases. Further, when the driver rotates the steering wheel 2 counterclockwise from the neutral position, the driver moves the line of sight to the left side in the width direction of the vehicle 1, and the amount of movement of the line of sight at that time is determined by the rotation angle from the neutral position of the steering wheel. Increase with increase. Furthermore, as the vehicle speed increases, the traveling direction of the vehicle 1 changes greatly with respect to the rotating operation of the steering wheel 2, and thus the amount of movement of the line of sight of the driver accompanying the rotation of the steering wheel 2 increases.

Therefore, by rotating the projection unit 11 as described above, it is possible to change the position P2 at which the virtual image of the information can be seen in accordance with the moving direction and the moving amount of the line of sight of the driver who rotates the steering wheel 2. it can. As a result, the position P2 where the virtual image of the above information is visible moves in the direction in which the driver's line of sight is facing.

The electronic control unit 20 drives the motor 16 to rotate the projection unit 11 in the up-down direction according to the inclination angle of the vehicle 1 with respect to the horizontal plane as the process of S107. Specifically, when the vehicle 1 is tilted such that the front end of the vehicle 1 is above the horizontal plane, the projection position P1 is projected so as to move upward by an amount corresponding to the tilt angle of the vehicle 1 at that time. The part 11 is rotated. Further, when the vehicle 1 is inclined so that the front end of the vehicle 1 is below the horizontal plane, the projection position P1 is moved downward by an amount corresponding to the inclination angle of the vehicle 1 at that time. The part 11 is rotated.

Here, the driver of the vehicle 1 moves the line of sight to the upper side when the vehicle 1 is tilted so that the front end of the vehicle 1 is above the horizontal plane, and the amount of movement of the line of sight at that time is changed. Increase with increasing tilt angle. In addition, the driver moves the line of sight downward when the vehicle 1 is tilted so that the front end of the vehicle 1 is below the horizontal plane, and the amount of movement of the line of sight at that time is determined by the tilt angle of the vehicle 1. Decrease with decreasing. Therefore, by rotating the projection unit 11 as described above, the position P2 where the virtual image of the information can be seen can be changed in accordance with the inclination angle of the vehicle 1 with respect to the horizontal plane, and the driver can see in the direction in which the line of sight is directed. The position P2 where the virtual image of information can be seen moves.

The electronic control device 20 adjusts the color of the light beam (information) generated in the light emitting unit 8 in accordance with the image from the camera 5 that captures the front of the vehicle 1 as the process of S108. Here, depending on the scenery located in front of the vehicle 1, the color of the road surface, etc., they may overlap with the virtual image of the above information and may be difficult for the driver to see. In the process of S108, the color of the light beam (information) generated in the light emitting unit 8 is adjusted according to the image from the camera 5 in order to deal with such a situation, and thereby the virtual image of the information becomes difficult for the driver to see. Is trying to suppress.

According to this embodiment described in detail above, the following effects can be obtained.
(1) From the driver of the vehicle 1 in which the head-up display 7 is mounted, a virtual image of the information is displayed at a position P2 distant forward from the projection position P1 of the information (light ray) on the windshield glass 6. You can see it. Then, in the head-up display 7, by displacing the projection unit 11 through the displacement device 13, it becomes possible to change the position where the virtual image of the above information is visible to the driver. Therefore, the driver displaces the projection unit 11 through the displacement device 13 so that the position where the virtual image of the information can be seen changes in the direction in which the line of sight of the driver who is looking ahead of the vehicle 1 changes. It is possible to reduce the amount of movement of the line of sight when alternately viewing the front and the virtual image of information by the head-up display 7.

(2) The displacement device 13 is controlled by the electronic control device 20 according to the vehicle situation related to the movement of the line of sight of the driver of the vehicle 1. Therefore, when the driver's line-of-sight moves in a vehicle situation, by controlling the displacement device 13 according to the vehicle situation, the position P2 where the virtual image of the information can be seen in the direction in which the driver's line of sight is seen. It is possible to displace the projection unit 11 so that By displacing the projection unit 11 in this manner, the position where the virtual image of the information can be seen can be quickly changed in the direction in which the driver's line of sight is facing.

(3) As the vehicle condition related to the movement of the line of sight of the driver of the vehicle, there are the rotation direction and the rotation angle from the neutral position of the steering wheel 2 in the vehicle 1. When the steering wheel 2 is rotated clockwise from the neutral position by a predetermined rotation angle, the projection position P1 of the information is changed to the right side in the width direction of the vehicle 1 by the amount corresponding to the predetermined rotation angle. It On the other hand, when the steering wheel 2 is rotated leftward from the neutral position by a predetermined rotation angle, the projection position P1 of the information is changed to the left side in the width direction of the vehicle 1 by the amount corresponding to the predetermined rotation angle. It As a result, the position P2 where the virtual image of the information can be seen can be changed according to the moving direction and the moving amount of the line of sight of the driver who rotates the steering wheel 2. As a result, the position P2 where the virtual image of the information is visible can be moved in the direction in which the driver's line of sight is facing. Therefore, the direction in which the driver directs his or her line of sight and the position P2 where the virtual image of the above information can be seen are largely different from each other, and the amount of movement of the line of sight is large when the driver alternately sees the front of the vehicle 1 and the above virtual image of the above information. Can be suppressed.

(4) There is also the vehicle speed as a vehicle condition related to the movement of the line of sight of the driver of the vehicle. The faster the vehicle speed, the more the traveling direction of the vehicle changes with respect to the rotational operation of the steering wheel 2. As a result, the amount of movement of the driver's line of sight increases. In consideration of this, when the projection unit is rotated in the width direction of the vehicle in accordance with the rotation of the steering wheel 2, the rotation of the projection unit 11 for changing the projection position P1 of the information in the width direction of the vehicle 1. The amount increases as the vehicle speed increases. Therefore, as described above, even if the amount of movement of the line of sight of the driver when the steering wheel 2 is rotated increases as the vehicle speed increases, the position P2 where the virtual image of the above information is visible can be changed accordingly. You can

(5) Since the headlamp 3 is displaced in the vehicle 1 according to the rotation direction and the rotation angle from the neutral position of the steering wheel 2, a sensor (rotation) for detecting the rotation direction and the rotation angle of the steering wheel 2 is used. An angle sensor 24) is provided. Therefore, when the projection unit 11 of the head-up display 7 is rotated around the rotation axis 17 and in the width direction of the vehicle 1 according to the rotation direction and the rotation angle from the neutral position of the steering wheel 2, the sensor (rotation angle The sensor 24) can be used, and the increase in the number of parts can be suppressed by such use.

(6) It is possible to change the depth of the virtual image of the information by selecting one of the plurality of optical fibers 9 and 10 having different lengths as the optical fiber for transmitting the light through the switching operation of the switching device 12. it can. Therefore, when the driver changes the focus position on the line of sight toward the front of the vehicle 1 in the front-rear direction of the vehicle 1 according to the vehicle situation, it is possible to change the depth of the virtual image of the information in accordance with it. By changing the depth of the virtual image of the information as described above, when the driver alternately views the front of the vehicle 1 and the virtual image of the information, the change in the focal position on the line of sight of the driver in the front-rear direction is reduced. However, the eyestrain of the driver can be reduced.

(7) The switching device 12 is controlled by the electronic control device 20 in accordance with the vehicle condition related to the change in the focus position on the line of sight of the driver. For this reason, when a driver's line-of-sight focus position changes in a vehicle situation, by controlling the switching device 12 in accordance with the vehicle state, the direction in which the driver's line-of-sight focus position changes In addition, it is possible to change the depth of the virtual image so that the position P2 where the virtual image of the information can be seen changes. By changing the depth of the virtual image of the information in this way, the position P2 where the virtual image of the information can be seen can be rapidly changed in the direction in which the focal position on the line of sight of the driver changes.

(8) The vehicle condition related to the change of the focal position on the line of sight of the driver of the vehicle 1 is, for example, the vehicle speed. The faster the vehicle speed, the more the driver sees the front of the vehicle 1 on the line of sight of the driver. The focus position of changes to the front side. Then, when the vehicle speed is equal to or higher than the threshold value, the optical fiber 10 longer than the optical fiber 9 is selected as the optical fiber for transmitting the light beam, while when the vehicle speed is lower than the threshold value, the light beam is transmitted. The optical fiber 9 shorter than the optical fiber 10 is selected as the optical fiber. As a result, even if the focus position on the line of sight of the driver changes in the front-back direction as the vehicle speed increases, the depth of the virtual image of the above information can be changed accordingly, and the position where the virtual image can be seen is changed back and forth. You can change the direction.

(9) The driver of the vehicle 1 moves the line of sight to the upper side when the vehicle 1 is tilted so that the front end of the vehicle 1 is above the horizontal plane, and at the same time, the amount of movement of the line of sight of the vehicle 1 is changed. Increase with increasing tilt angle. In addition, the driver moves the line of sight downward when the vehicle 1 is tilted so that the front end of the vehicle 1 is below the horizontal plane, and the amount of movement of the line of sight at that time is determined by the tilt angle of the vehicle 1. Decrease with decreasing. In consideration of this, when the vehicle 1 is tilted so that the front end of the vehicle 1 is above the horizontal plane, the projection position P1 moves upward by an amount corresponding to the tilt angle of the vehicle 1 at that time. The projection unit 11 is rotated so as to do so. Further, when the vehicle 1 is inclined so that the front end of the vehicle 1 is below the horizontal plane, the projection position P1 is moved downward by an amount corresponding to the inclination angle of the vehicle 1 at that time. The part 11 is rotated. By rotating the projection unit 11 as described above, the position P2 where the virtual image of the above information can be seen can be changed corresponding to the inclination angle of the vehicle 1 with respect to the horizontal plane, and the above information can be changed in the direction in which the driver's line of sight is facing. It becomes possible to move the position P2 where the virtual image is visible.

(10) Depending on the scenery located in front of the vehicle 1, the color of the road surface, etc., they may overlap the virtual image of the above information and may be difficult for the driver to see. In order to deal with this, the color of the light beam (information) generated by the light emitting unit 8 is adjusted according to the image from the camera 5 so as to prevent the virtual image of the information from becoming difficult for the driver to see. ing. Therefore, the driver can see the virtual image of the above information without being affected by the scenery located in front of the vehicle 1 or the color of the road surface.

The above embodiment can be modified as follows, for example.
It is not essential to adjust the color of the light beam (information) generated by the light emitting unit 8 according to the image from the camera 5.

Instead of adjusting the color of the light beam (information) generated by the light emitting unit 8 according to the image from the camera 5, the projection unit 11 is displaced and the projection position P1 is moved to shift the position P2 of the virtual image of the information. This may prevent the virtual image of the above information from becoming difficult for the driver to see.

-Three or more optical fibers having different lengths may be provided, and a longer optical fiber may be selected and used as the vehicle speed increases. In this case, even if the focus position on the line of sight of the driver changes forward as the vehicle speed increases, the depth of the virtual image of the information seen by the driver can be increased accordingly.

The optical fiber to be used can be selected not only based on the vehicle speed, but also according to the scenery located in front of the vehicle 1 or the color of the road surface.
-For example, the distance to the preceding vehicle may be used as the vehicle state related to the change in the focus position on the line of sight of the driver. The shorter the distance is, the closer the focus position on the line of sight of the driver is to the vehicle 1. Therefore, the shorter the distance is, the shorter the optical fiber is selected and used. The distance to the preceding vehicle can be calculated based on, for example, an image captured by the camera 5.

The switching device 12 may be such that the switching operation is performed manually. In this case, the driver switches the switching device 12 according to the change in the front-back direction of the focal position on the line of sight of the driver.

-There may be only one optical fiber. In this case, the switching device 12 can be omitted.
Although the present invention is applied to the vehicle 1 having the function of displacing the headlamp 3 in accordance with the rotation direction and the rotation angle from the neutral position of the steering wheel 2, the present invention can also be applied to a vehicle without such a function.

When the projection unit 11 is rotated in the width direction of the vehicle 1 according to the rotation of the steering wheel 2, the rotation amount at that time does not necessarily have to be changed according to the vehicle speed.
-Instead of detecting the inclination angle of the vehicle 1 with respect to the horizontal plane by the inclination angle sensor, the inclination angle may be estimated based on the support information (map information, current vehicle position) from the navigation device 23.

-It is not essential to rotate the projection unit 11 in the vertical direction according to the inclination angle. When the projection unit 11 is not rotated in the vertical direction, the motor 16 and the rotary shaft 14 can be omitted.

The driver's line of sight may be determined using a camera or the like, and the projection unit 11 may be displaced so that the virtual image of the above information is displaced in the direction in which the determined line of sight is directed.
The projection unit 11 may be manually displaced. In this case, the driver displaces the projection unit 11 as the line of sight of the driver moves.

The movement of the projection position P1 in the width direction of the vehicle 1 should be realized by sliding movement of the projection unit 11 in the width direction of the vehicle 1 instead of being realized by rotating the projection unit 11 around the rotation axis 17. May be.

1... Vehicle, 2... Steering wheel, 3... Headlamp, 4... Actuator, 5... Camera, 6... Windshield glass, 7... Head-up display, 8... Light emitting part, 9... Optical fiber, 10... Optical fiber, 11 ... Projection unit, 12... Switching device, 13... Displacement device, 14... Rotation shaft, 15... Base member, 16... Motor, 17... Rotation shaft, 18... Rotating body, 19... Motor, 20... Electronic control device, 21... Vehicle speed sensor, 22... Inclination angle sensor, 23... Navigation device, 24... Rotation angle sensor.

Claims (7)

A light emitting unit for generating information as a light beam, an optical fiber having one end connected to the light emitting unit for transmitting the light beam, and a light emitting unit provided at the other end of the optical fiber for transmitting the light beam to a vehicle windshield. In a head-up display of a vehicle that includes a projection unit that projects on glass,
A displacement device that displaces the projection unit so that the projection position of the light beam on the windshield glass is changed ,
A plurality of optical fibers having different lengths are provided as the optical fibers, and a switching device that performs a switching operation such that any one of the plurality of optical fibers is selected as an optical fiber that transmits the light beam is provided. Characteristic vehicle heads-up display. The head-up display for a vehicle according to claim 1, further comprising a control unit that controls the displacement device according to a vehicle condition related to movement of a line of sight of a driver of the vehicle. The displacement device rotates the projection unit in the vehicle width direction so that the projection position of the light beam on the windshield glass is changed at least in the vehicle width direction,
The vehicle condition related to the movement of the driver's line of sight of the vehicle, the rotation direction and the rotation angle from the neutral position of the steering wheel in the vehicle,
The control unit controls the displacement unit so that the projection position of the light beam on the windshield glass is changed according to the rotation direction and the rotation angle from the neutral position of the steering wheel. The head-up display for a vehicle according to claim 2, which is rotated in a direction. The vehicle condition related to the movement of the line of sight of the driver of the vehicle includes vehicle speed,
The control unit controls the displacement unit so that the projection position of the light beam on the windshield glass is changed according to the rotation direction and the rotation angle from the neutral position of the steering wheel. The head-up display of the vehicle according to claim 3, wherein when the vehicle is rotated in the direction, the rotation amount of the projection unit is increased as the vehicle speed is increased. 5. The vehicle according to claim 3, wherein the headlamp is operated so that an optical axis of the headlamp is displaced in a width direction of the vehicle according to a rotation direction and a rotation angle from a neutral position of the steering wheel. Head-up display of the described vehicle. The displacement device is controlled according to a vehicle condition related to the movement of the line of sight of the driver of the vehicle, and the switching device is controlled according to the vehicle condition related to a change of the focus position on the line of sight of the driver of the vehicle. The vehicle head-up display according to claim 1 , further comprising a controller. The vehicle condition related to the change of the focus position on the line of sight of the driver of the vehicle is the vehicle speed,
The vehicle head-up display according to claim 6 , wherein the control unit controls the switching device such that an optical fiber having a long length is selected as an optical fiber that transmits the light beam as a vehicle speed increases.

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