JP2019089435A - Head-up display device - Google Patents

Abstract

To increase an angle of view of display by mainly eliminating the necessity of enlargement of an outer shape of a head-up display device and miniaturization of a reflection member.SOLUTION: A head-up display device 2 includes: a display device 4 which is capable of displaying driving information 3; a reflection member 6 which is capable of reflecting the driving information 3 from the display device 4 toward the front of a cabin 5; a display device 7 which is capable of displaying the driving information 3 by rotating the reflection member 6 around a rotary shaft 8; and an angle change mechanism 11 which is capable of changing an angle between the angle change mechanism and a display stop position 9 positioned when stopping display of the driving information 3. The angle change mechanism 11 has a shaft displacement mechanism 32 capable of preventing interference with a peripheral member 31 of the reflection member 6 by displacing the rotary shaft 8 when changing an angle of the reflection member 6 to the display stop position 9.SELECTED DRAWING: Figure 4

Description

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

  A head-up display device is mounted on a vehicle such as a car (see, for example, Patent Document 1).

  There are various types of head-up display devices, but they have a display device capable of displaying driving information, and a reflecting member capable of reflecting driving information (display image) from the display device toward the front of the passenger compartment Things exist.

  In the head-up display device having such a configuration, the reflection information reflects the driving information from the display device toward the front of the vehicle compartment, thereby generating a virtual image of the driving information in front of the vehicle compartment, and the front surface The driving information can be viewed without causing the occupant who is driving facing the eye movement. At this time, by providing the reflection member, it is possible to lengthen the optical path of the operation information from the display device or to expand the operation information, thereby making it possible to achieve a large angle of view of the display. It will be.

  And, when the head-up display device has a reflection member, an angle change mechanism capable of changing the angle of the reflection member is provided.

  The angle changing mechanism rotates the reflecting member about the rotation axis to move the reflecting member between the display position where the operation information can be displayed and the display stop position where the display of the operation information is stopped. It is supposed to change the angle at.

  Then, for example, with the end of driving or the like, the reflection member is moved (changed in angle) to the display stop position by turning off the vehicle or the head-up display device, etc., and the display is stopped.

JP 2000-137189 A

  As described above, when the angle change mechanism provided in the head-up display device is configured to change the angle of the reflecting member by turning around the rotation axis, the turning locus of the reflecting member is large, When changing the angle, the reflective member may interfere with the peripheral member. If an attempt is made to secure a sufficient space to prevent interference of the reflective member with the peripheral member, the outer shape of the head-up display device will be enlarged. On the other hand, if the reflective member is downsized to prevent interference with the peripheral member of the reflective member, it is difficult to achieve a large angle of view of the display.

  Therefore, the present invention is mainly intended to solve the above-mentioned problems.

In order to solve the above problems, the present invention is
A display device capable of displaying driving information;
A reflective member capable of reflecting the driving information from the display device toward the front of the cabin;
A head having an angle change mechanism capable of changing the angle between a display position where operation information can be displayed and the display stop position at which the display of the operation information is stopped with the reflection member centered on the rotation axis In the up display device,
The angle changing mechanism is provided with a shaft displacing mechanism capable of preventing interference with peripheral members of the reflecting member by displacing the rotation axis when changing the angle of the reflecting member to the display stop position. It features.

  According to the present invention, with the above configuration, it is possible to achieve a large angle of view of display without the need to increase the external size of the head-up display device and to miniaturize the reflection member.

It is a figure showing the state where the head up display device concerning this embodiment was carried to vehicles. It is the block diagram which looked at the head-up display apparatus of FIG. 1 from the side. It is the elements on larger scale of FIG. 2 which shows the state which made the reflection member the display position. FIG. 7 is a partial enlarged side view similar to FIG. 3 showing a state in which the reflecting member is in the display stop position. It is a side view of a rotating shaft which has a slide starting point part. FIG. 6 is a partially enlarged side view similar to FIGS. 3 and 4, showing a support structure of a reflection member according to a comparative example.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 6 are for explaining this embodiment.

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

  As shown in FIG. 1 (FIG. 2), a head-up display device 2 that can be mounted on a vehicle 1 such as a car is provided. In addition, about a direction, it is set as the vehicle longitudinal direction X, the vehicle width direction Y, and the up-down direction Z on the basis of the vehicle 1.

This head-up display device 2
A display device 4 capable of displaying driving information 3;
A reflecting member 6 capable of reflecting the driving information 3 from the display device 4 toward the front of the passenger compartment 5;
As shown in FIG. 2, between the display position 7 where the driving information 3 can be displayed and the display stop position 9 where the reflecting member 6 can be displayed when the display of the driving information 3 is stopped. It is assumed that the angle changing mechanism 11 capable of changing the angle is provided.

  Here, in a vehicle 1 such as a car, a passenger compartment 5 for a passenger to board is provided. A front window glass 12 is provided at the front of the passenger compartment 5, and an interior panel such as an instrument panel 13 is provided below the front window glass 12. The head-up display device 2 can be installed inside the instrument panel 13. The instrument panel 13 is provided with an opening for passing the operation information 3.

  The head-up display device 2 is a device that makes it possible to visually recognize the driving information 3 without causing the occupant driving while facing the front to make a large eye movement.

  The head-up display device 2 has a main body casing 14 in which the display device 4 and the reflection member 6 are accommodated. The main casing 14 is installed in the passenger compartment 5 (in the instrument panel 13) with its width direction directed substantially in the vehicle width direction Y. In the upper part of the main body casing 14, an opening serving as an emission part of the driving information 3 into the compartment 5 is provided. A transparent dustproof cover 15 can be attached to this opening. The dustproof cover 15 may be flat, but in order to prevent the dustproof cover 15 from being reflected on the front window glass 12, it has a concave shape or the like which is recessed downward when viewed from the side. The control board 16 can be installed inside the main body casing 14.

  The driving information 3 is general information to support driving, for example, speed information, road information (for example, lane display, leading car display, oncoming car display, pedestrian display, etc.), course information (For example, right turn indication or left turn indication), destination information (for example, arrival time or travel distance to destination), traffic jam information, service information (for example, parking lot information, gas station information, etc. Peripheral facility guidance) and other displays can be used.

  The display device 4 can use a liquid crystal panel 4a, an organic EL panel, or the like. In addition, a projector using a DLP unit can also be used. The display device 4 has a rectangular display surface or the like. In the case of the liquid crystal panel 4a, a backlight 17 is provided on the back side. The back light 17 has an LED 17 b serving as a light source, a heat sink 17 c and the like installed on the back side of the cylindrical reflector 17 a. The liquid crystal panel 4a is installed on the surface side of the reflector 17a. The liquid crystal panel 4a is connected to the control board 16 via a cable 18 (for example, a flexible printed board or the like) and a connector 18a.

  The reflecting member 6 is a reflecting mirror. A plane mirror or a curved mirror can be used for the reflecting mirror. In this embodiment, the first reflecting mirror 6a and the second reflecting mirror 6b are provided in order from the side closer to the display device 4 (in the light path) inside the main body casing 14, and the first reflecting mirror 6a An infrared transmitting type) planar mirror and the second reflecting mirror 6b are curved mirrors (concave mirrors or magnifying mirrors).

  Then, the first reflecting mirror 6a is installed at the rear side (vehicle rear side) position of the main body casing 14, and the second reflecting mirror 6b is installed at the front side (vehicle front side) of the main body casing 14. An optical path of operation information 3 is formed in the main body casing 14. The number and the arrangement of the reflecting members 6 are not limited to the above.

  In this embodiment, the first reflecting mirror 6a is fixed, and the angle of the second reflecting mirror 6b can be changed as described later.

  The second reflecting mirror 6 b is mounted rotatably integrally with the rotating shaft 8 so that the angle is changed by rotation around the rotating shaft 8.

  The rotation shaft 8 extends substantially horizontally in the width direction of the main casing 14. Thereby, the reflecting member 6 can be rotated in the vehicle longitudinal direction X and the vertical direction Z.

  The second reflecting mirror 6 b can change its angle between the display position 7 and the display stopping position 9, but the display position 7 passes the operation information 3 reflected by the first reflecting mirror 6 a through the dustproof cover 15. It is the direction of reflection toward the inside of the cabin 5. In the compartment 5, a reflection portion 27 (FIG. 1) is provided for reflecting the driving information 3 reflected into the compartment 5 toward the driver at the driver's seat. The reflecting portion 27 may be the front window glass 12 of the vehicle 1 or may be a dedicated reflecting plate (combiner). The front window glass 12 becomes a reflection portion 27 by performing a reflection process (for example, providing a fine reflection surface or providing a reflection film). The driving information 3 reflected by the reflection unit 27 is imaged as a virtual image 28 (FIG. 1) at a position in front of the reflection unit 27, and the driver's seat occupant overlaps the external scenery viewed through the front window glass 12. It becomes possible to visually recognize the virtual image 28 of the driving information 3.

  The display stop position 9 is a position (retracted position, stored position, or origin position) at which the reflecting member 6 is retracted or stored when the head-up display device 2 is not used. The reflection member 6 is moved to the display stop position 9 when, for example, the vehicle 1 or the head-up display device 2 is turned off after the driving is finished.

  The angle change mechanism 11 will be described later.

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

  (1) As shown in FIG. 3 and FIG. 4, when the angle changing mechanism 11 changes the angle of the reflecting member 6 to the display stop position 9, the rotation shaft 8 is displaced and the peripheral member 31 of the reflecting member 6 is displaced. An axial displacement mechanism 32 capable of preventing interference is provided.

  Here, the peripheral member 31 is, for example, the main body casing 14 of the head-up display device 2 or the like. In this embodiment, the dustproof cover 15 installed on the upper part of the main body casing 14 is the peripheral member 31 which is likely to interfere with the reflecting member 6.

  In particular, the dustproof cover 15 has a concave shape so as to prevent external light reflected by the dustproof cover 15 from being reflected in the front window glass 12, etc. Around the lowest point, etc.) it is the easiest to interfere with the upper end of the reflecting member 6.

  Therefore, the shaft displacing mechanism 32 prevents the interference between the reflecting member 6 and the dustproof cover 15 by displacing the rotary shaft 8 in the direction away from the lowermost point of the dustproof cover 15 (interference preventing mechanism or retraction mechanism Etc.).

  However, the peripheral member 31 that interferes with the reflecting member 6 is not limited to the above, and other components of the main body casing 14 or components installed inside the main body casing 14 may be considered.

  The shaft displacing mechanism 32 may be anything as long as it can prevent interference with the peripheral member 31, but it is preferably as described later.

  (2) The shaft displacing mechanism 32 may have a bearing 41 for pivotally supporting the rotating shaft 8 in a slidable manner.

  Here, the bearing 41 is a bearing that displaces the rotating shaft 8 by sliding. The sliding direction of the rotary shaft 8 by the bearing 41 is a direction to avoid interference with the peripheral member 31 of the reflecting member 6, and may be, for example, the longitudinal direction (vehicle longitudinal direction X) or the vertical direction Z of the main body casing 14. it can. In this embodiment, the bearing 41 slides the rotary shaft 8 in the front-rear direction of the main body casing 14.

  The bearing 41 has a shaft hole, a bearing groove 45 and the like for supporting the rotating shaft 8. The shaft hole and the bearing groove 45 are elongated to connect between the shaft position (FIG. 3) when the reflecting member 6 is directed to the display position 7 and the shaft position (FIG. 4) when facing the display stop position 9 It will be shaped.

  In this embodiment, the bearing 41 has a bearing groove 45 opened to the front side. A closing member 46 is attached to the open portion of the bearing groove 45. The closing member 46 is fixed to a portion above the bearing groove 45 of the bearing 41 with the fixing member 47 only at the upper end portion thereof, and the lower end side is free. Then, by making the closing member 46 an elastic member 46 a such as a plate spring, the open portion of the bearing groove 45 can be opened and closed. At this time, the elastic member 46 a always biases the closing member 46 in the closing direction by its elastic force, thereby pushing the rotary shaft 8 toward the back (rear side) of the bearing groove 45 and the rotary shaft 8 is a bearing. It is considered as a return spring which holds the groove 45 so as not to come off completely.

  However, the configuration of the bearing 41 is not limited to the above, and for example, a clamp mechanism or another mechanism may be used.

(3) The angle change mechanism 11 may be provided with the drive gear 51 and the driven gear 52 for transmitting the drive force of the drive gear 51 to the rotary shaft 8.
The shaft displacing mechanism 32 may have non-circular gear teeth 53 formed by changing the radius of rotation of the driven gear 52 or the drive gear 51 so that the rotary shaft 8 slides with respect to the bearing 41.

  Here, the drive gear 51 is a circular small diameter gear. The drive gear 51 is directly or indirectly connected to the output shaft of the drive motor 54. In this embodiment, the drive gear 51 is disposed at a position closer to the center in the front-rear direction (rear side) of the main body casing 14 below the rotary shaft 8.

  The driven gear 52 is a gear having a diameter larger than that of the drive gear 51. The driven gear 52 may be a sector gear or the like having a required central angle, if necessary. The driven gear 52 is directly connected to the rotating shaft 8.

  The non-circular gear teeth 53 can be provided for at least one of the drive gear 51 and the driven gear 52 as described above.

  The non-circular gear tooth 53 with respect to the driven gear 52 or the drive gear 51 is, for example, the display stop position of the reflection member 6 based on the rotation radius (r1) when the reflection member 6 faces the display position 7 As the angle is changed toward 9, the turning radius (r2) is made to gradually increase from the constant state (r1 <r2).

  In this embodiment, non-circular gear teeth 53 are provided for the driven gear 52. The non-circular gear teeth 53 of the driven gear 52 are designed to gradually increase the radius of rotation as they rotate clockwise. However, the change of the rotation radius may be appropriately set according to the positional relationship between the drive gear 51 and the driven gear 52, and the displacement direction of the rotating shaft 8.

(4) As shown in FIG. 5, the shaft displacing mechanism 32 may have a slide starting point 61 protruding from the rotation shaft 8.
The slide start point portion 61 may be a start point when the rotary shaft 8 rotates and contacts the bearing 41, and the rotary shaft 8 may be forcibly slid relative to the bearing 41.

  Here, the slide start portion 61 is a projection or the like provided partially in the circumferential direction with respect to the rotation shaft 8. The slide start portion 61 is provided so as to contact the bearing 41 when the direction of the reflection member 6 approaches the display stop position 9 or when the display stop position 9 is reached. In this embodiment, the slide starting point portion 61 is provided to abut on the upper side of the front side of the bearing 41 (the side on which the rotation shaft 8 moves) when approaching the display stop position 9. The slide start portion 61 is provided at a position not to overlap the closing member 46 in the longitudinal direction of the rotation shaft 8. The installation position and the like of the slide starting point portion 61 may be appropriately set in accordance with the shape of the bearing 41, the displacement direction of the rotating shaft 8, and the like.

  Furthermore, the rotation shaft 8 has, for example, a gradually expanding shape in which the radius gradually increases from a constant state toward the slide starting point 61, and the tip of the slide starting point 61 and the outer peripheral surface of the rotation shaft 8 are smooth. A curved guide portion 65 or the like may be provided so as to connect to The guide portion 65 makes it possible to more smoothly guide the displacement of the rotating shaft 8 by the slide starting point 61.

  In addition, each above-mentioned structure can be combined suitably and can be used.

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

  The head-up display device 2 reflects the driving information 3 (display image) from the display device 4 toward the front of the passenger compartment 5 by the reflecting member 6 to make a virtual image 28 of the driving information 3 forward of the passenger compartment 5. In order to make it possible to visually recognize the driving information 3 without causing a passenger driving toward the front to cause a large eye movement. At this time, by providing the reflecting member 6, it is possible to lengthen the optical path of the operation information 3 from the display device 4 (so that the image forming position becomes far) or to expand the operation information 3 Thus, it is possible to achieve a wide angle of view of the display. Thus, the reflective member 6 is an important component for achieving a wide angle of view.

  When the head-up display device 2 includes the reflecting member 6, the angle changing mechanism 11 capable of changing the angle of the reflecting member 6 is provided.

  The angle changing mechanism 11 rotates the reflecting member 6 (in the vehicle longitudinal direction X and the vertical direction Z) about the rotation axis 8 to display the reflecting member 6 at the display position 7 where the driving information 3 can be displayed. The angle is changed between the display stop positions 9 to be positioned when the display of the operation information 3 is stopped.

  Then, for example, with the end of driving or the like, the reflecting member 6 is moved (changed in angle) to the display stop position 9 by turning off the vehicle 1 or the head-up display device 2 or the like, and the display device 4 displays It is stopped.

  Under the present circumstances, the angle change mechanism 11 is a drive gear which has the general bearing 48 (not the bearing 41 which pivotally supports the rotating shaft 8 slidably) and a circular gear tooth part as shown to the comparative example of FIG. When the angle of the reflecting member 6 is changed about the rotation axis 8 (the position is fixed) using the gear 51 or the driven gear 52, the turning locus of the reflecting member 6 becomes large. At this time, the reflection member 6 interferes with the peripheral member 31 (interference unit 49).

  When an attempt is made to secure a sufficient space to prevent interference between the reflective member 6 and the peripheral member 31, the outer size of the head-up display device 2 (the main body casing 14) becomes large. On the contrary, if the reflecting member 6 is downsized in order to prevent interference with the peripheral member 31 of the reflecting member 6, it is difficult to achieve a large angle of view of the display.

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

  (Effect 1) About the shaft displacement mechanism 32

  The angle change mechanism 11 of the reflection member 6 is provided with the shaft displacement mechanism 32 capable of displacing the rotation shaft 8. Then, when the angle changing mechanism 11 changes the angle of the reflecting member 6, the axis displacing mechanism 32 displaces the rotating shaft 8 to change the angle of the reflecting member 6 while retracting so as not to interfere with the peripheral member 31. It will be possible.

  That is, when changing the angle of the reflective member 6 from the display position 7 to the display stop position 9, the rotary shaft 8 is displaced so as to move the reflective member 6 away from the peripheral member 31, and conversely, the display stop position of the reflective member 6 When changing the angle from 9 to the display position 7, the rotation shaft 8 is displaced so that the reflective member 6 approaches the peripheral member 31.

  Therefore, it is possible to eliminate the need to enlarge the outer shape of the head-up display device 2 and to eliminate the need to miniaturize the reflecting member 6, thereby obtaining a large angle of view of the display.

  Specifically, in the case of this embodiment, since the peripheral member 31 is the dustproof cover 15 provided on the upper portion of the main body casing 14, the shaft displacement mechanism 32 is provided to reflect the reflective member 6 at the display position 7. Even if (the second reflecting mirror 6b) is disposed at a higher position and brought close to the dustproof cover 15, the reflecting member 6 (second reflection is obtained by moving the rotary shaft 8 away from the dustproof cover 15 when setting the display stop position 9). It becomes possible to retract the mirror 6 b) so as not to interfere with the dustproof cover 15. Therefore, the main casing 14 of the head-up display device 2 can be miniaturized without downsizing the second reflecting mirror 6 b.

  (Effect 2) About the bearing 41

  The shaft displacing mechanism 32 may have a bearing 41 for pivotally supporting the rotating shaft 8 in a slidable manner. Thereby, when the angle changing mechanism 11 changes the angle of the reflection member 6 from the display position 7 to the display stop position 9 or, conversely, changes the angle of the reflection member 6 from the display stop position 9 to the display position 7, On the other hand, the shaft displacing mechanism 32 can change the angle of the reflecting member 6 so as not to interfere with the peripheral member 31 by appropriately sliding the rotating shaft 8 in the retracting direction or the returning direction.

  And, by the shaft displacement mechanism 32 having the above-described bearing 41, the shaft displacement mechanism 32 can be made to be able to slide the rotary shaft 8 reliably with a simple structure.

  If a return spring such as an elastic member 46a is provided on the bearing 41 so that the rotary shaft 8 is always urged in the return direction by the elastic member 46a, the rotary shaft can be rotated only when sliding in the retraction direction. It is structurally advantageous because it is better to operate 8 actively.

  (Effect 3) Non-circular gear teeth 53

  The angle change mechanism 11 may be configured to drive the drive gear 51 to rotate the driven gear 52. Thereby, by transmitting the driving force of the drive gear 51 to the rotary shaft 8 through the driven gear 52, the rotary shaft 8 is rotationally driven to automatically change the angle of the reflecting member 6 attached to the rotary shaft 8 It will be possible to

  At this time, as the shaft displacement mechanism 32, at least one of the driven gear 52 or the drive gear 51 may have a non-circular gear tooth portion 53. As a result, the driven gear 52 or the drive gear 51 does not have a constant rotation radius (the distance from the rotating shaft 8 to the meshing position of the drive gear 51 and the driven gear 52), so that the driven gear is rotated by the rotation of the drive gear 51. As the rotational position of the driven gear 52 or the drive gear 51 changes as the meshing position with 52 moves in the circumferential direction, the rotary shaft 8 can be slid relative to the bearing 41 accordingly.

  Specifically, the rotation shaft 8 is slid away from the meshing position (in the retraction direction) as the rotation radius increases, and is slid so as to approach the meshing position (in the return direction) as the rotation radius decreases. It will be.

  As a result, the rotary shaft 8 can be reliably slid with a simple structure in which the non-circular gear teeth 53 are provided on the driven gear 52 or the drive gear 51. In addition, since the rotation shaft 8 can be slid only by the angle change mechanism 11, the need to prepare a special drive source can be eliminated in order to slide the rotation shaft 8.

  (Effect 4) About the slide starting point 61

  As the shaft displacing mechanism 32, the slide starting point portion 61 may be provided to protrude from the rotation shaft 8. As a result, as the slide starting point 61 abuts the bearing 41 by the rotation of the rotating shaft 8, the rotating shaft 8 can be slid starting from the slide starting point 61.

  Specifically, when changing the angle of the reflection member 6 from the display position 7 to the display stop position 9, the rotation shaft 8 is rotated (clockwise in the figure). Then, the slide starting point portion 61 rotates together with the rotation shaft 8 and the slide starting point portion 61 hits the bearing 41 (the upper part of the front side surface or the like) at or immediately before the display stop position 9. As a result, the rotation of the slide starting point portion 61 is restricted, and the rotation center of the rotation shaft 8 is shifted to the contact portion between the slide starting point portion 61 and the bearing 41. By trying to rotate around the contact portion, the inside of the bearing groove 45 of the bearing 41 is forced to slide in the retraction direction. This makes it possible to reliably displace the rotating shaft 8 in the retraction direction.

  Conversely, when changing the angle of the reflecting member 6 from the display stop position 9 to the display position 7, the rotation shaft 8 is rotated in the opposite direction (counterclockwise in the drawing). Then, although the slide starting point portion 61 gradually moves away from the contact portion of the bearing 41 by the rotation of the rotating shaft 8, the rotating shaft 8 is pushed toward the back of the bearing groove 45 by the elastic force of the closing member 46. Therefore, the rotation shaft 8 is slid in the return direction by the elastic force as much as the slide start portion 61 tries to move away from the bearing 41. This makes it possible to reliably displace the rotating shaft 8 in the return direction.

  As a result, the rotary shaft 8 can be reliably slid with a simple structure in which the slide starting point portion 61 is provided on the rotary shaft 8. Further, since the rotary shaft 8 can be slid only by providing the slide starting point portion 61 on the rotary shaft 8, it is possible to eliminate the need for preparing a special drive source for sliding the rotary shaft 8.

Reference Signs List 2 head-up display device 3 operation information 4 display device 5 compartment 6 reflection member 7 display position 8 rotary shaft 9 display stop position 11 angle change mechanism 51 drive gear 52 driven gear 31 peripheral member 32 shaft displacement mechanism 41 bearing 53 gear tooth portion 61 Slide starting point X Vehicle longitudinal direction Y Vehicle width direction Z vertical direction

Claims (4)

A display device capable of displaying driving information;
A reflective member capable of reflecting the driving information from the display device toward the front of the cabin;
A head having an angle change mechanism capable of changing the angle between a display position where operation information can be displayed and the display stop position at which the display of the operation information is stopped with the reflection member centered on the rotation axis In the up display device,
The angle changing mechanism is provided with a shaft displacing mechanism capable of preventing interference with peripheral members of the reflecting member by displacing the rotation axis when changing the angle of the reflecting member to the display stop position. Head-up display device characterized by In the head-up display device according to claim 1,
The head-up display device, wherein the shaft displacement mechanism includes a bearing that slidably supports the rotation shaft. In the head-up display device according to claim 2,
The angle changing mechanism includes a drive gear, and a driven gear that transmits the driving force of the drive gear to the rotation shaft.
The shaft displacement mechanism has non-circular gear teeth formed by changing the radius of rotation of the driven gear or the drive gear such that the rotation shaft is slid with respect to the bearing. Head-up display device. In the head-up display device according to claim 2 or 3,
The shaft displacing mechanism has a slide starting point protruding from the rotation shaft,
The head-up display device according to claim 1, wherein the slide start point portion is a start point when the rotary shaft is rotated to hit the bearing, and the rotary shaft is forcibly slid relative to the bearing.