JP2018176849A - Head-up display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a structure which does not need to use a high torque rotary drive device. An optical component 11 that guides an image of a display device to a reflecting portion provided in front of a driver's seat and displays it as a virtual image, and an optical component 11 that can adjust the position of the virtual image up and down by changing the angle of the optical component 11. The present invention relates to a head-up display device including a component angle changing device 12. The optical component angle changing device 12 includes a rotary drive device 13 and a reduction gear mechanism 14. Then, the reduction gear mechanism 14 is configured such that the drive gear 22 attached to the output shaft 21 of the rotation drive device 13 and the driven gear 24 attached to the rotation center shaft 23 of the optical component 11 are directly meshed with each other. The driven gear 24 has a diameter larger than that of the drive gear 22. An urging means 28 for urging the optical component 11 so as to rotate in one direction toward the fixed point 26 is interposed between the fixed point 26 and the tip end side portion of the driven gear 24. [Selection diagram] Fig. 4

Description

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

  There is a vehicle such as an automobile in which a head-up display device (head-up display device for a vehicle) is installed. The head-up display device includes a display device for displaying information, and a reflection unit capable of displaying an image of the display device as a virtual image in front of the driver's seat (see, for example, Patent Document 1).

  Then, an optical component angle changing device is provided between the display device and the reflection section, by which the position of the virtual image can be adjusted up and down by changing the angle of the optical component.

JP, 2016-180796, A

  However, in the head-up display device of Patent Document 1 described above, since the biasing means having a large biasing force is used in the optical component angle changing device, the angle of the optical component can be changed against the biasing force of the biasing means. In order to achieve this, a high torque rotary drive has been required.

  Therefore, the main object of the present invention is to solve the above-mentioned problems.

In order to solve the above problems, the present invention is
An optical component that guides an image of a display device that displays information to a reflection unit provided in front of a driver's seat and displays it as a virtual image;
And an optical component angle changer capable of adjusting the position of the virtual image up and down by changing the angle of the optical component.
In a head-up display device, the optical component angle changing device has a rotational drive device and a reduction gear mechanism for transmitting rotational drive force of the rotational drive device to the optical component,
The reduction gear mechanism has a configuration in which a drive gear attached to the output shaft of the rotary drive and a driven gear attached to the central axis of rotation of the optical component are directly meshed.
Making the driven gear larger in diameter than the drive gear;
Biasing means is provided between the fixed point and the tip end side portion of the driven gear so as to bias the optical component so as to turn in one direction toward the fixed point. Do.
Further, by increasing the diameter of the driven gear and reducing the load on the urging means by attaching the driven gear to the tip end portion, it is possible to preferably use a low torque rotational drive device.

  According to the present invention, with the above configuration, it is possible to obtain a structure that does not require the use of a high torque rotational drive device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the head-up display apparatus concerning this Embodiment. FIG. 1 is a perspective view of an optical component and an optical component angle changer according to a first embodiment. It is a right view of FIG. It is a left view of FIG. It is an enlarged view of the meshing part of the drive gear of FIG. 2, and a driven gear. FIG. 7 is a perspective view of an optical component and an optical component angle changer according to a second embodiment. It is a left view of FIG. It is a right view of FIG. It is an enlarged view of the meshing part of the drive gear of FIG. 6, and a driven gear.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 9 are for explaining this embodiment. Among these, FIGS. 2 to 5 show the first embodiment, and FIGS. 6 to 9 show the second embodiment.

  <Configuration> The configuration of this embodiment will be described below.

  As shown in FIG. 1, the head-up display device 1 (head-up display device for a vehicle) is installed in a vehicle such as a car.

  Here, the head-up display device 1 includes at least a display device 2 for displaying information, and a reflection portion 6 (or a reflection member) capable of displaying the image 3 of the display device 2 as a virtual image 5 in front of the driver's seat 4. Have. In the case of the head-up display device 1 for a vehicle, the display device 2 can mainly display information for supporting driving. The reflection portion 6 can be a front window glass 7 or a reflection plate 8 (combiner) installed in a vehicle compartment. In this embodiment, the reflecting portion 6 is a reflecting plate 8. In addition, the front window glass 7 can reflect the image 3 of the display apparatus 2 and can project the virtual image 5 by using glass of a wedge-shaped cross section, or providing a reflective film. The head-up display device 1 for a vehicle can be installed inside an instrument panel 9 installed at the front of the vehicle interior. The instrument panel 9 has an opening 9 a on the top surface for guiding the image 3 of the display device 2 to the reflecting portion 6.

Then, one or more optical components 11 for guiding the image 3 of the display device 2 to the reflection portion 6 provided in front of the driver's seat 4 are provided between the display device 2 and the reflection portion 6.
And as shown in FIG. 2, the optical component angle changer 12 which can adjust the position of the virtual image 5 up and down by changing the angle of the optical component 11 is provided.
The optical component angle changer 12 has a rotary drive 13 and a reduction gear mechanism 14 for transmitting the rotational drive force of the rotary drive 13 to the optical component 11.

  Here, the optical component 11 includes a plane mirror for bending an optical path or lengthening an optical path length from the display device 2 to the reflection unit 6 and a concave mirror for further enlarging the image 3.

  The optical component angle changer 12 mainly adjusts the height of the virtual image 5 so that the virtual image 5 can be easily viewed according to the height of the eye of the occupant (virtual image height adjuster). The optical component angle changer 12 moves the optical component 11 to the standby position when the head-up display device 1 is not in use, and moves the optical component 11 to the use position while the head-up display device 1 is moving. The angle adjustment of the optical component 11 can be suitably performed within the use position having the range of.

  The angular range from the standby position to the use position (the movable limit on the opposite side to the standby position) is the movable range of the optical component 11. The standby position is a position where the optical component 11 has risen in the vertical direction so that sunlight from the outside is not reflected toward the display device 2. In addition, the use position is a position where the optical component 11 lies obliquely so that the virtual image 5 is reflected on the reflection portion 6 and the position adjustment of the virtual image 5 can be performed according to the physical size of the occupant.

  The rotational drive device 13 can be, for example, a motor such as a stepping motor. In this case, the accuracy of the angle adjustment of the optical component angle changer 12 depends on the resolution of the stepping motor. The reduction gear mechanism 14 is a mechanism that uses a gear to slow the rotation of the rotary drive 13.

  In contrast to the basic configuration as described above, in this embodiment, the following configuration is provided.

(1) As shown in FIGS. 3 and 4, the drive gear 22 attached to the output shaft 21 of the rotary drive 13 with the reduction gear mechanism 14, and the driven gear 24 attached to the rotation center shaft 23 of the optical component 11. Directly meshed.
Then, the driven gear 24 is made larger in diameter than the drive gear 22 (diameter of the driven gear 24> diameter of the drive gear 22).
Furthermore, a biasing means 28 is provided between the fixed point 26 and the tip end side portion 27 of the driven gear 24 so as to bias the optical component 11 in one direction toward the fixed point 26 side. Do.

  Here, the drive gear 22 is a circular gear. The rotation center shaft 23 of the optical component 11 is provided to extend in the width direction from both side portions in the width direction of the optical component 11. The rotation center shaft 23 is provided at a position of an intermediate portion in the vertical direction of the optical component 11 or the like. However, the position of the rotation center shaft 23 is not limited to the above.

  The left and right rotation center shafts 23 are supported by bearings 29 respectively. The bearing 29 is appropriately provided with an axial regulating member for appropriately regulating an axial displacement, a radial displacement, a rotational displacement and the like of the rotation center shaft 23 and applying a required load. In this embodiment, a pressing spring such as a leaf spring or a coil spring is appropriately used as the axis regulating member.

  The reduction gear mechanism 14 has a configuration of only two sheets of the drive gear 22 (first gear) and the driven gear 24 (second gear). The driven gear 24 has a diameter sufficiently larger than that of the drive gear 22. The ratio of the sizes of the driven gear 24 and the drive gear 22 is set based on the distance between the output shaft 21 and the rotation center shaft 23, the generated torque of the rotation drive device 13, and the like. For example, the diameter of the driven gear 24 is set to about three to six times the diameter of the drive gear 22.

  The fixed point 26 may be any fixed point. The fixing point 26 may be, for example, a body of the vehicle, a main body casing of the head-up display device 1, or a component of the head-up display device 1 whose position is fixed. In this embodiment, the fixed point 26 is provided on the casing of the rotary drive 13.

  The tip end portion 27 of the driven gear 24 is a portion of the main body portion excluding the teeth 24 a of the driven gear 24 that is the portion closer to the teeth of the driven gear 24. The tip end side portion 27 is set at the position of the surface of the main body portion of the driven gear 24, the position of the edge, etc. in such a manner as not to impede the meshing or turning of the gear. As the biasing means 28, a spring such as a coil spring, a torsion spring or a plate spring can be used.

  (2) As shown in FIG. 5 (FIG. 9), the biasing means 28 is disposed in the direction 33, 34 tangential to the circle 31, 32 of the bottom of the drive gear 22 and the driven gear 24.

  Here, as the biasing means 28, it is preferable to use a tension spring (coil spring) in which the biasing direction coincides with the direction of deformation. The circles 31 and 32 at the bottom of the tooth are two circles: a circle 31 passing the tooth bottom of the drive gear 22 around the output shaft 21 and a circle 32 passing the tooth bottom of the driven gear 24 around the rotation center shaft 23 It is about 31, 32. The tangential directions 33, 34 are directions parallel to the common tangent of the two circles 31, 32. Although there are two common tangents of the two circles 31 and 32, either common tangent can be used depending on the biasing direction of the biasing means 28.

  Specifically, FIGS. 2 to 5 show an example in which the driven gear 24 is biased downward in the figure by the biasing means (first embodiment). In this case, since the teeth 24a of the driven gear 24 press the teeth 22a of the drive gear 22 downward from the upper side, the transmission direction of the driving force between the teeth 22a and 24a and the biasing direction of the biasing means 28 are In order to coincide with each other, biasing means 28 is installed in a tangential direction 33 connecting the lower contact of the drive gear 22 with the circle 32 and the upper contact of the driven gear 24 with the circle 32.

  6 to 9 show an example in which the driven gear 24 is urged upward in the drawing by the urging means 28 (Embodiment 2). In this case, since the teeth 24a of the driven gear 24 press the teeth 22a of the drive gear 22 upward from the lower side, the transmission direction of the driving force between the teeth 22a and 24a and the biasing direction of the biasing means 28 Are arranged in a tangential direction 34 connecting the contact on the upper side of the circle 31 of the drive gear 22 and the contact on the lower side of the circle 32 of the driven gear 24.

(3) The driven gear 24 is a sector gear 41 having a central angle equal to the movable range of the optical component 11.
Then, the biasing means 28 is attached to the tip end portion 27 of the sector gear 41 located on the opposite side of the fixing point 26.

  Here, the sector gear 41 is a fan-shaped partial gear. The central angle of the sector gear 41 is approximately 15 ° to 30 °. The tip end portion 27 opposite to the fixing point 26 is the tip end portion 27 of the sector gear 41 far from the fixing point 26. For example, in Example 1 of FIGS. 2-5, the fixed point 26 is a lower side and the front end side part 27 of the sector gear 41 is an upper side. In the first embodiment, the fixing point 26 is provided using an attachment portion (to the main body of the head-up display device 1) or the like located below the rotary drive device 13. On the contrary, in Example 2 of FIGS. 6-9, the fixed point 26 becomes an upper side and the front end side part 27 of the sector gear 41 becomes a lower side. In the second embodiment, the fixed point 26 is provided on the arm 13 a extended from the top of the rotary drive 13.

(4) A stopper 51 is provided to restrict the rotation of the optical component 11 beyond the movable range.
Then, the stopper portion 51 is installed at a position where the front end side portion 27 of the sector gear 41 abuts.

  Here, the stopper portion 51 can be provided, for example, on a vehicle body, a main body casing of the head-up display device 1, a component of the head-up display device 1 whose position is fixed, or the like. In this case, the stopper 51 is a hard projection provided on the block member.

  The stopper portion 51 may be provided at one of the movable limit positions of the movable range of the optical component 11 or may be provided at both movable limit positions. In this embodiment, the stopper portion 51 is provided only for the movable limit on the standby position side (lower side in the drawing).

  When the stopper 51 is provided on the lower side and the sector gear 41 is urged upward by the urging means 28 as in the second embodiment, the sector gear 41 is turned downward and the stopper is When it hits 51, the tooth 24a of the sector gear 41 is urged upward by the urging means 28 and the tooth 22a of the drive gear 22 (meshing from the upper side with the tooth 24a of the sector gear 41) drives the rotary drive 13 Since the movement is downward due to the force, the teeth 24a of the sector gear 41 and the teeth 22a of the drive gear 22 do not separate by pressing each other, so no backlash occurs between the teeth 22a and 24a. The advantage is obtained. Thereby, when the use of the head-up display device 1 is stopped, it is possible to stably stop the optical component 11 at the standby position without rattling.

  <Operation> The operation of this embodiment will be described below.

  The head-up display device 1 is a device that can display the image 3 as a virtual image 5 in front of the driver's seat 4 by reflecting the image 3 of the display device 2 by the reflection unit 6. This makes it possible to visually recognize information for assisting the driving without significantly moving the eyes during driving.

  At this time, even if the internal space of the head-up display device 1 is small by bending the optical path of the image 3 of the display device 2 using the optical component 11 provided between the display device 2 and the reflection portion 6 The image 3 of the display device 2 can be guided to the reflection part 6 provided in front of the driver's seat 4 without any problem. In addition, by bending the optical path with the optical component 11, the optical path length can be lengthened so that the virtual image 5 can be seen further. When the optical component 11 is a concave mirror, the virtual image 5 can be enlarged.

  Furthermore, by making the optical component 11 adjustable in angle, it is possible to adjust the height of the virtual image 5 reflected on the reflection section 6 according to the physical constitution of the occupant. By adjusting the angle of the optical component 11, the virtual image 5 can be easily viewed. The angle adjustment of the optical component 11 can be performed using the rotation drive device 13 of the optical component angle changer 12 and the reduction gear mechanism 14. When the rotary drive 13 is driven, the meshing position of the drive gear 22 of the reduction gear mechanism 14 and the driven gear 24 changes, so that the angle of the optical component 11 changes.

  <Effects> According to this embodiment, the following effects can be obtained.

  (Effect 1) The reduction gear mechanism 14 is configured to directly mesh the drive gear 22 attached to the output shaft 21 of the rotary drive 13 with the driven gear 24 attached to the rotation center shaft 23 of the optical component 11. As a result, the number of gears of the reduction gear mechanism 14 can be reduced to two, and the reduction gear mechanism 14 can be minimized and reduced in size and weight. Thus, the design freedom for the reduction gear mechanism 14 can be increased, and the number of design steps can be reduced. Further, by reducing the number of gears of the reduction gear mechanism 14 to two, the parts cost required for the reduction gear mechanism 14 can be reduced and the assembly of the reduction gear mechanism 14 can be facilitated.

  Then, the driven gear 24 has a diameter larger than that of the drive gear 22. As a result, the reduction ratio of the reduction gear mechanism 14 is increased, so that even with the low torque rotation drive device 13, the optical component 11 can be driven without any trouble through the driven gear 24 to perform angle adjustment. Therefore, the structure does not require the high torque rotational drive device 13, and the degree of freedom in selecting the rotational drive device 13 to be used can be increased. For example, the rotary drive 13 can be widely selected from commercially available inexpensive motors.

  Then, biasing means 28 is interposed between the fixed point 26 and the driven gear 24 so as to turn the optical component 11 in the one direction toward the fixed point 26 side. Thereby, the biasing means 28 can be used as a spring for keeping the meshing between the drive gear 22 and the driven gear 24 in a good condition. The biasing means 28 can also be used as a return spring for returning the optical component 11 to the initial position when the rotary drive 13 is free. Then, the posture of the optical component 11 can be stabilized by the biasing force of the biasing unit 28 without directly applying the load by the biasing unit 28 to the optical component 11.

  At this time, in particular, by devising the attachment position of the urging means 28 and attaching the urging means 28 to the tip end portion 27 of the driven gear 24, for example, the driven gear close to the rotation center shaft 23 The moment arm can be made longer than when the biasing means 28 is attached to the base of 24. Therefore, even if the biasing force of the biasing means 28 is small, it is possible to obtain a moment necessary for biasing the optical component 11. Therefore, a low load spring having a weak biasing force can be used for the biasing means 28.

  The low torque rotational drive device 13 is preferably used by increasing the diameter of the driven gear 24 as described above and reducing the load on the urging means 28 by attaching the driven gear 24 to the tip end portion 27 of the driven gear 24. become able to. The low torque rotary drive 13 can be moved at a higher speed than the high torque rotary drive 13, so that the optical component 11 can be moved faster accordingly. And can accelerate the operation during operation.

  (Effect 2) The biasing means 28 can be disposed in the direction 33, 34 tangential to the circle 31, 32 of the bottom of the drive gear 22 and the driven gear 24. Thereby, the transmission direction of the driving force between the teeth 22a of the drive gear 22 and the teeth 24a of the driven gear 24 and the biasing direction of the biasing means 28 coincide with each other, and the teeth 22a of the drive gear 22 and the driven gear Since the 24 teeth 24a can always be stably pressed in a fixed direction (tangential directions 33 and 34), it is possible to suppress the occurrence of backlash between the teeth 22a and 24a. Therefore, it is possible to suppress and prevent the backlash of the optical component 11 due to the backlash in the movable range.

  In addition, since the teeth 22a of the drive gear 22 and the teeth 24a of the driven gear 24 can be stably pressed in a fixed direction, unnecessary component forces are not generated, and component calculation becomes unnecessary. As well as reducing design man-hours, it is possible to obtain product movement and performance as designed by eliminating product variation due to the influence of components.

  (Effect 3) The driven gear 24 can be a sector gear 41. As a result, the non-use portion of the large diameter side driven gear 24 can be eliminated to reduce the size of the driven gear 24 to the minimum necessary size. Therefore, the driven gear 24 with a large diameter can be installed even in a narrow space.

  Further, the biasing means 28 can be attached to the tip end portion 27 of the sector gear 41 located on the opposite side to the fixing point 26. Thereby, the angle change of the biasing means 28 accompanying the rotation of the driven gear 24 is reduced, and the biasing means 28 moves from the tangential direction 33, 34 of the circles 31, 32 of the tooth bottom of the drive gear 22 and the driven gear 24. The biasing means 28 can be easily installed so as not to be largely removed.

  At this time, the fixing point 26 is provided on the extension of the sector gear 41 on the side toward which the urging means 28 is attached to the meshing portion of the sector gear 41 and the drive gear 22 from the tip end portion 27 on the side attached Since it passes near the rotary drive 13, the fixing point 26 can be easily provided at an appropriate position, for example, by extending the arm 13a from the rotary drive 13.

  Further, since the biasing means 28 can use a longer object (long spring) as compared with the case of being attached to the tip end portion 27 on the fixing point 26 side of the sector gear 41, the entire range of the movable range of the optical component 11 Stable biasing force can be obtained. Further, by making the biasing means 28 longer, it becomes possible to use, for example, a coil spring whose diameter of winding is reduced or the number of windings is reduced, so that the biasing means 28 can be simplified.

  (Effect 4) A stopper portion 51 can be provided to restrict the rotation of the optical component 11 beyond the movable range. Then, the stopper portion 51 can be installed at a position where the tip end portion 27 of the sector gear 41 abuts. As a result, the tip end side portion 27 of the sector gear 41 abuts against the stopper portion 51, thereby reliably restricting the rotation of the sector gear 41 and rotating the optical component 11 beyond the movable range, and the sector gear 41 and the drive. The disengagement with the gear 22 can be prevented. Thereby, the sector gear 41 can be used stably.

  Then, by providing the stopper portion 51 at a position to be in contact with the sector gear 41, it is possible to stop the transmission of the driving force on the side closer to the rotation driving device 13 in the driving force transmission path from the rotation driving device 13 to the optical component 11 Therefore, the optical component 11 can be stopped more stably. In addition, since the stopper portion 51 exists at a position not in direct contact with the optical component 11, it is possible to prevent a defect such as damage to the optical component 11 caused by the stopper portion 51. Furthermore, by the sector gear 41 contacting the stopper portion 51 at the position of the movable limit, it becomes possible to mechanically detect the position of one movable limit of the optical component 11 as the zero point of the stepping motor.

  Further, by providing the stopper portion 51 at a position where the tip end side portion 27 of the sector gear 41 abuts, for example, the optical component 11 is provided more than in the case where the stopper portion 51 is provided at a position where a base of the sector gear 41 close to the rotation center shaft 23 abuts. Position accuracy can be improved.

Reference Signs List 1 head-up display device 2 display device 3 image 4 driver's seat 5 virtual image 6 reflector 11 optical component 12 optical component angle changing device 13 rotational drive device 14 reduction gear mechanism 21 output shaft 22 drive gear 23 rotation center shaft 24 driven gear 26 fixed Point 27 tip side portion 28 biasing means 31 circle 32 circle 33 tangential direction 34 tangential direction 41 sector gear 51 stopper portion

Claims (4)

An optical component that guides an image of a display device that displays information to a reflection unit provided in front of a driver's seat and displays it as a virtual image;
And an optical component angle changer capable of adjusting the position of the virtual image up and down by changing the angle of the optical component.
In a head-up display device, the optical component angle changing device has a rotational drive device and a reduction gear mechanism for transmitting rotational drive force of the rotational drive device to the optical component,
The reduction gear mechanism has a configuration in which a drive gear attached to the output shaft of the rotary drive and a driven gear attached to the central axis of rotation of the optical component are directly meshed.
Making the driven gear larger in diameter than the drive gear;
Biasing means is provided between the fixed point and the tip end side portion of the driven gear so as to bias the optical component so as to turn in one direction toward the fixed point. Head-up display device. A head-up display device according to claim 1, wherein
A head-up display device characterized in that the biasing means is disposed in a direction tangential to a circle of the bottom of the drive gear and the driven gear. The head-up display device according to claim 1 or 2, wherein
The driven gear is a sector gear having a central angle equal to the range of motion of the optical component, and
A head-up display device characterized in that the biasing means is attached to a tip side portion of the sector gear opposite to the fixing point. The head-up display device according to claim 3,
While providing a stopper portion for restricting the rotation beyond the movable range of the optical component,
A head-up display device characterized in that the stopper portion is disposed at a position where the front end side portion of the sector gear contacts.