JP2019162904A - Mirror support structure of head-up display device - Google Patents

Abstract

To hold chiefly a rotary shaft of a mirror stably in all directions with a simple structure.SOLUTION: A mirror support structure 20 has: rotary shafts 21 and 22 which are projected from a side face 6a of a mirror 6; bearings 23 and 24 which support the rotary shafts 21 and 22; and an elastic member 26 which presses the mirror 6 from one side to the other side in an axial direction 25 of the rotary shafts 21 and 22. The bearing 24 positioned on the other side has a tapered recess 24b at a depth part of a shaft hole 24a. The rotary shaft 22 supported by the bearing 24 on the other side has a pointed sharp part 22b, which is slidingly fitted into the tapered recess 24b, on a tip side of a shaft support part 22a with respect to the shaft hole 24a. The pointed sharp part 22b has a shape different from that of the tapered recess 24b, and is brought into line contact with the tapered recess 24b in a circumferential direction.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a mirror support structure for a head-up display device.

  In recent years, mounting a head-up display device on a vehicle such as an automobile has been promoted.

  There are various types of head-up display devices, and a display device that can display driving information and a mirror that can reflect driving information (display image) from the display device toward the front of the passenger compartment are provided. Things exist.

  In the head-up display device having such a configuration, the driving information from the display device is reflected by the mirror toward the front of the passenger compartment, thereby generating a virtual image of the driving information in front of the passenger compartment, Driving information can be visually recognized without causing a large line-of-sight movement to the occupant driving facing.

  The head-up display device includes a rotating shaft protruding from the side surface of the mirror, a bearing that supports the rotating shaft, and an elastic member that presses the mirror from one side to the other side in the axial direction of the rotating shaft. Some have a mirror support structure (see, for example, Patent Document 1).

Japanese Patent No. 5446837

  In the head-up display device, if the mirror rattles during operation, the display image is blurred. Therefore, the mirror support structure needs to stably hold the rotation axis of the mirror in all directions in order to prevent blurring of the display image due to the backlash of the mirror.

  Therefore, the present invention mainly aims to solve the above-described problems.

In order to solve the above problems, the present invention provides:
A head-up display device comprising: a rotary shaft protruding from a side surface of the mirror; a bearing that supports the rotary shaft; and an elastic member that presses the mirror from one side to the other side in the axial direction of the rotary shaft. In the mirror support structure of
The bearing located on the other side has a tapered recess at the back of the shaft hole,
The rotary shaft that is pivotally supported by the bearing on the other side has a sharp pointed portion that is slidably fitted into the tapered concave portion on the distal end side of the pivotal support portion with respect to the shaft hole,
The sharpened portion has a shape different from the tapered concave portion, and is in line contact with the tapered concave portion in the circumferential direction.

  According to the present invention, the above configuration makes it possible to stably hold the rotation axis of the mirror in all directions with a simple structure.

It is a block diagram of a head-up display apparatus. It is a perspective view of the mirror support structure and mirror movable mechanism of FIG. It is the longitudinal cross-sectional view (use position (standard position)) of the bearing which looked at the mirror of FIG. 2 from the right side. It is the longitudinal cross-sectional view (use position (height adjustment position)) of the bearing which looked at the mirror of FIG. 2 from the right side. It is the longitudinal cross-sectional view (standby position) of the bearing which looked at the mirror of FIG. 2 from the right side. It is a front view of the mirror and bearing of FIG. FIG. 5 is a partially enlarged front view of the right bearing of FIG. 4. It is a longitudinal cross-sectional view of FIG. It is the perspective view which made the bearing of FIG. 2 vertical. It is the end elevation which looked at the bearing of Drawing 2 from the inside. FIG. 3 is a plan view of the bearing of FIG. 2. It is a side view of the bearing of FIG. It is the end elevation which looked at the bearing of Drawing 2 from the outside. It is the elements on larger scale which looked at the rotating shaft of the other side of the mirror of FIG. 2 from the front side. It is the elements on larger scale which looked at the rotating shaft of the other side of the mirror of FIG. 2 from the back side. It is a longitudinal cross-sectional view (before assembly | attachment) which shows the assembly | attachment state of the rotating shaft with respect to the bearing which looked at the mirror of FIG. 2 from the right side. It is a longitudinal cross-sectional view (after assembly | attachment) which shows the assembly state of the rotating shaft with respect to the bearing which looked at the mirror of FIG. 2 from the right side. It is a longitudinal cross-sectional view which shows the relationship with the mirror moving mechanism before the assembly | attachment of the rotating shaft with respect to the bearing which looked at the mirror of FIG. 2 from the right side.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 10 are for explaining this embodiment.

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

  As shown in FIG. 1, a head-up display device 2 is mounted on a vehicle 1 such as an automobile.

  There are various types of head-up display devices 2. In this embodiment, the display device 4 that can display the driving information 3 and the driving information 3 (display image) from the display device 4 are displayed in front of the passenger compartment 1a. And a mirror 6 (reflecting member) that can be reflected toward the head.

  Here, the direction will be described with reference to a state in which the head-up display device 2 is mounted on the vehicle 1. The vehicle front-rear direction is substantially the front-rear direction X or the depth direction of the head-up display device 2, the vehicle width direction is substantially the width direction Y of the head-up display device 2, and the vertical direction of the vehicle 1 is substantially the vertical direction of the head-up display device 2. Z. However, since the head-up display device 2 may be mounted on the vehicle 1 in an inclined state, these directions may be shifted to some extent.

  The head-up display device 2 allows the occupant 7 who is driving facing the front to visually recognize the driving information 3 without causing a large line of sight movement. The head-up display device 2 is installed inside the instrument panel 12 provided in the front part of the passenger compartment 1a together with the casing 11 in a state where the display device 4 and the mirror 6 are accommodated in the casing 11. And the opening parts 13 and 14 which let the driving | running | working information 3 pass are provided in the upper surface of the casing 11 and the upper surface of the instrument panel 12. FIG. A transparent or translucent dustproof cover 15 or the like is installed in at least one of the openings 13 and 14 in a fixed state or an openable / closable state. The dust cover 15 may be flat, but may have a concave shape that is recessed downward as viewed from the side in order to prevent the dust cover 15 from being reflected on the front window 16.

  The driving information 3 passing through the openings 13 and 14 is reflected on the front window 16 or reflected on a dedicated reflector called a combiner installed on the front side of the openings 13 and 14 so that the passenger 7 It is visually recognized as a virtual image 18. In order to reflect the driving information 3, for example, a reflective film or a fine reflecting surface is provided on the front window 16 at least in a required range where the driving information 3 is projected.

  Driving information 3 is general information for driving assistance. The driving information 3 includes, for example, speed information, road information (for example, lane display, preceding vehicle display, oncoming vehicle display, pedestrian display, obstacle display, etc.), route information (for example, intersection information, Left and right turn display), destination information (for example, arrival time and mileage to the destination), traffic information, service information (for example, parking lot information, gas station information, neighboring facility information), And other indications.

  As the display device 4, a liquid crystal panel, an organic EL panel, or the like can be used. When a liquid crystal panel is used for the display device 4, an illumination device 4a serving as a backlight is provided on the back side of the liquid crystal panel. The display device 4 may be a projector using a DLP unit that reflects laser light with a micromirror. The display image (driving information 3) of the display device 4 is controlled by the control unit 4b.

  The passenger compartment 1a is a space in which the occupant 7 in the vehicle 1 is boarded. The mirror 6 is an optical component (reflecting member) such as a reflecting mirror. As the mirror 6, a plane mirror that reflects the operation information 3 (display image) from the display device 4 at an equal magnification, a curved mirror that reflects the enlarged image (concave mirror), or the like is used in an appropriate combination of one or a plurality (this) In the embodiment, two mirrors 6 are provided on the front and rear sides). For example, the mirror 6 can be directly fixed (fixed mirror) inside the casing 11 as in the right side of the figure. Moreover, the mirror 6 can be installed so that it can move with the mirror support structure 20 like the thing of the left side of a figure, for example (movable mirror).

  As shown in FIG. 2, the mirror support structure 20 supports the mirror 6 (at least one of the mirrors 6) so as to be rotatable about the rotation shafts 21 and 22. The mirror support structure 20 includes rotating shafts 21 and 22 projecting from the side surface 6 a of the mirror 6, bearings 23 and 24 that support the rotating shafts 21 and 22, and the mirror 6 in the axial direction 25 of the rotating shafts 21 and 22. And an elastic member 26 that presses from one side to the other side. The axial direction 25 is installed almost horizontally in the width direction Y in a state of being mounted on the vehicle 1.

  Here, the mirror 6 has a horizontally long shape extending substantially in the width direction Y, and is rotated in a substantially vertical direction Z about the rotation shafts 21 and 22. The mirror 6 is intentionally non-rectangular or the like in order to prevent distortion in the driving information 3 when reflected on the front window 16 having a complicated three-dimensional curved surface shape.

  The side surface 6 a of the mirror 6 is a pair of opposite sides provided with the rotation shafts 21 and 22, and is, for example, a vertical side of the mirror 6. The rotary shafts 21 and 22 project from the both side surfaces 6a of the mirror 6 so as to be laterally located on the same axis. The rotary shafts 21 and 22 may be provided at any position on the side surface 6a of the mirror 6, but in this embodiment, the rotary shafts 21 and 22 are provided at an intermediate portion (in the vertical direction Z) of the side surface 6a of the mirror 6. The rotating shafts 21 and 22 may be provided separately from the mirror 6, but when the mirror 6 is made of resin, the rotating shafts 21 and 22 can be formed integrally with the mirror 6.

  The elastic member 26 is provided on one side surface 6a (pressing side) of the mirror 6 and presses and biases the mirror 6 toward the other side surface 6a (pressed side), so that the mirror 6 moves due to vehicle vibration. This prevents the driving information 3 (display image) from blurring.

  The mirror support structure 20 enables the mirror 6 to rotate between a use position 34 as shown in FIGS. 3A and 3B and a standby position 35 as shown in FIG. 3C. The use position 34 is the position of the mirror 6 when the head-up display device 2 is used. At the use position 34, the display height can be adjusted so that the driving information 3 is displayed at the optimum position according to the physique (or eye height) of the occupant 7, and the mirror 6 is moved up and down. It is slightly rotated while lying relatively to the direction Z (rotation between FIGS. 3A and 3B).

  The standby position 35 is the position of the mirror 6 when the head-up display device 2 is not used. At the standby position 35, the mirror 6 stands in the vertical direction Z with respect to the use position 34 (FIG. 3C). By setting the mirror 6 to the standby position 35, the external light incident on the inside of the casing 11 is not retro-reflected toward the display device 4, so that the display device 4 can be prevented from being damaged by the external light retro-reflection. Even when the head-up display device 2 is used, when the amount of external light incident on the casing 11 is large, the mirror 6 can be temporarily set to the standby position 35 so that the external light is not retro-reflected. In particular, when a concave mirror is used for the mirror 6, since external light is collected by the concave mirror and applied to the display device 4, the display device 4 is greatly damaged. Evacuating to 35 is effective.

  Further, as shown in FIG. 2, the mirror 6 (movable mirror) supported by the mirror support structure 20 can be automatically moved (rotated) using the mirror movable mechanism 36 (or mirror rotating mechanism). Like that.

  The mirror movable mechanism 36 may be a link mechanism or a gear mechanism. In this embodiment, the mirror movable mechanism 36 includes an arm portion 37 attached to one rotary shaft 21 and an actuator 38 that rotates the rotary shaft 21 and the mirror 6 via the arm portion 37. When the mirror movable mechanism 36 is a link mechanism, the arm portion 37 is moved by an actuator 38 such as a cylinder.

  When the mirror movable mechanism 36 is a gear mechanism, the arm portion 37 is, for example, a gear such as a sector gear that extends in the radial direction of the rotating shaft 21 and has gear teeth 37a at the tip. The sector gear is formed at an angle (approximately 25 ° to 30 °) that covers at least the normal use range between the standby position 35 and the use position 34. A motor is used for the actuator 38. The motor rotates the arm portion 37 by meshing a gear such as a drive gear 38a attached to the output shaft with the gear teeth 37a of the sector gear. Rotating members (or shaft attachment members) such as the arm portion 37 and the driving gear 38a constitute a driving force transmission portion (or driving force transmission mechanism). Contrary to the above, the arm portion 37 may be attached to the output shaft of the motor, and the drive gear 38a may be attached to the rotating shaft 21. The arm portion 37 is urged by the return spring 39 toward one of the rotational directions toward the use position 34 or the standby position 35 described above. The return spring 39 also performs loose play between the sector gear and the drive gear 38a. The motor is fixed to the casing 11 via the mounting bracket 40. The normal use range will be described later.

  In this embodiment, the mirror support structure 20 is configured as follows for the head-up display device 2 as described above.

(1) As shown in FIG. 4, the mirror support structure 20 includes rotating shafts 21 and 22 that protrude from the side surface 6 a of the mirror 6, bearings 23 and 24 that support the rotating shafts 21 and 22, and the mirror 6. And an elastic member 26 that presses the shaft from one side to the other side in the axial direction 25 of the rotating shafts 21 and 22.
At this time, as shown in FIG. 6, the other-side bearing 24 shown in FIG. 5 has a tapered recess 24b at the back of the shaft hole 24a.
Further, the rotary shaft 22 that is pivotally supported by the bearing 24 on the other side has a sharp pointed portion 22b that is slidably fitted into the tapered recess 24b on the distal end side of the pivotal support portion 22a with respect to the shaft hole 24a. .
The sharp pointed portion 22b has a shape different from that of the tapered concave portion 24b and is in line contact with the tapered concave portion 24b in the circumferential direction (line contact portion 20a).

  Here, the other-side bearing 24 is as shown in FIGS. 7A to 7E. The shaft hole 24a is a cylindrical space provided in the other bearing 24 for supporting the other rotating shaft 22. The tapered recess 24b has, for example, a conical shape that gradually decreases in diameter toward the other side in the axial direction 25.

  The other bearing 24 is provided with a mounting flange 24 d for mounting on the casing 11. A screw hole 24e for screwing to the casing 11 is formed through the mounting flange 24d. Various types of pins 24f such as a fixing pin for fixing the pin to the casing 11 and a positioning pin for positioning are provided on the lower surface of the mounting flange 24d.

  As shown in FIGS. 8A and 8B, the shaft support 22 a is a substantially cylindrical portion that is provided in the shaft hole 24 a of the bearing 23 and is provided on the other rotation shaft 22.

  The sharp pointed portion 22b has, for example, a conical shape that gradually decreases in diameter toward the other side of the axial direction 25. The tip of the sharp pointed portion 22b may be rounded as necessary.

  The different shapes include, for example, different tip angles of the tapered concave portion 24b and the sharpened sharp portion 22b, or the conical surface of the tapered concave portion 24b and the sharpened sharpened portion 22b are made concave or convex. It is obtained by combining. In this embodiment, as shown in FIG. 6, the tip angle of the sharpened portion 22b that is sharper than the tapered concave portion 24b is reduced to bring them into line contact in the circumferential direction.

  (2) As shown in FIGS. 9A and 9B, the bearing 24 may have a slit 24c penetrating the inside and outside of the shaft hole 24a on the side surface. Further, the rotary shaft 22 may have a notch surface 22c that can be inserted into the shaft hole 24a through the slit 24c from the direction intersecting the axial direction 25 on the outer peripheral surface of the shaft support portion 22a.

  Here, the side surface of the bearing 24 is a cylindrical portion in which the rotating shaft 22 surrounds the outer periphery of the outer peripheral surface of the shaft support portion 22a. The slit 24 c is narrower than the diameter of the rotary shaft 22 and is formed at an upper position in the drawing on the side surface of the bearing 24. The slit 24c is formed from the one side in the axial direction 25 toward the other side of the upper side surface of the bearing 24 up to a position on the near side of the recess 24b so as not to reach the recess 24b.

  The direction intersecting with the axial direction 25 can widely include directions other than the axial direction 25, but since it is the mounting direction 28 of the rotating shaft 22 with respect to the bearing 24, the direction orthogonal to the axial direction 25 is preferable. In this embodiment, the mounting direction 28 of the rotary shaft 22 is substantially below the vertical direction Z in the figure.

  A pair of notches 22c are provided in parallel to both side surfaces of the shaft support 22a so that the shaft support 22a has the same width as the slit 24c or slightly smaller than that. Due to this cut-out surface 22c, the shaft support portion 22a of the bearing 24 has an oval or racetrack cross section.

  (3) As shown in FIGS. 3A to 3C, the notch surface 22c does not coincide with the slit 24c when the mirror 6 is at an angle within the normal use range, and as shown in FIGS. 9A and 9B, It may be formed at a position that matches the slit 24c when the angle is outside the normal use range.

  Here, the angle within the normal use range of the mirror 6 is the rotation range of the mirror 6 when the head-up display device 2 is normally used after the product is completed, and is used as shown in FIGS. 3A to 3C. This is the rotation angle between the position 34 and the standby position 35.

  The angle outside the normal use range of the mirror 6 is the other angle. For example, an angle that is not used when the head-up display device 2 is normally used or a special angle (assembly angle) that is used only when the head-up display device 2 is assembled. The angle outside the normal use range is preferably a position slightly deviated from the angle within the normal use range (for example, the standby position 35 in FIG. 3C), as shown in FIGS. 9A and 9B. That is, it is preferable that the cut-out surface 22c is not aligned with the slit 24c at the standby position 35 in FIG. 3C, and the cut-out surface 22c is aligned with the slit 24c at the assembly position in FIGS. 9A and 9B. In this embodiment, the notch surface 22 c is not parallel to the side surface 6 a of the mirror 6.

  Further, as shown in FIG. 10, when the rotary shaft 22 is mounted on the bearing 24 at an angle (assembly angle) that matches the notch surface 22c with the slit 24c, the arm portion is attached to the drive gear 38a installed in the casing 11 in advance. The center angle of the sector gear is preferably set slightly larger than the rotation angle required for the normal use range so that the ends of the gear teeth 37a of the 37 just mesh. Thus, even when the actuator 38 having the drive gear 38a is attached to the casing 11 and the arm portion 37 of the mirror movable mechanism 36 is attached to the rotating shaft 21, the rotating shafts 21 and 22 are assembled to the bearings 23 and 24. In addition, the rotating shafts 21 and 22 are stably held so as not to be disengaged from the bearings 23 and 24 by the meshing of the gear teeth 37a and the drive gear 38a.

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

  The head-up display device 2 reflects the driving information 3 from the display device 4 toward the front of the passenger compartment 1a by the mirror 6, thereby generating a virtual image 18 of the driving information 3 in front of the passenger compartment 1a. The driving information 3 can be visually recognized without causing the occupant 7 driving facing the front to move a large line of sight.

  At this time, by providing a mirror 6 in the middle of the optical path and bending the optical path, the driving information 3 from the display device 4 (compared to directing the driving information 3 from the display device 4 directly to the front of the passenger compartment 1a). This makes it possible to lengthen the optical path and to enlarge and display the driving information 3. As a result, the head-up display device 2 can display the driving information 3 at a distance, increase the angle of view of the driving information 3, and the like.

  The mirror 6 is rotatably supported by the mirror support structure 20 and the mirror movable mechanism 36 so that the angle can be changed between the use position 34 and the standby position 35. The mirror 6 is pressed and urged from the pressing side toward the pressed side by the elastic member 26 in order to prevent the influence of vehicle vibration.

  At this time, the mirror support structure 20 stably holds the rotating shafts 21 and 22 of the mirror 6 (particularly, the rotating shaft 22 on the pressed side) in all directions in order to prevent blurring of the display image due to the backlash of the mirror 6. There is a need to.

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

  (Effect 1) A tapered concave portion 24b is provided in the inner portion of the bearing 24 on the other side, and a sharp pointed portion 22b provided on the rotary shaft 22 is slidably fitted into the concave portion 24b. And the recessed part 24b of the bearing 24 of the other side and the sharp pointed part 22b of the rotating shaft 22 were made into different shapes, and it was made to line-contact in the circumferential direction. Thus, the elastic member 26 simply pushes the mirror 6 from one side to the other side, and the other-side bearing 24 allows the rotation shaft 22 on the other side of the mirror 6 to be connected to the axial direction 25 and the axial direction 25. It becomes possible to stably support the shaft in all directions in the orthogonal direction. As described above, since the rotation shaft 22 of the mirror 6 is stably held in all directions, it is possible to prevent the display image from being blurred due to the backlash of the mirror 6. Further, since pressing in all directions can be realized with a simple structure, the pressing member for suppressing the backlash of the mirror 6 is only the elastic member 26, and the number of parts and the part cost can be reduced.

  (Effect 2) You may provide the slit 24c which penetrates between the inside and outside of the shaft hole 24a in the side part of the bearing 24. FIG. Moreover, you may provide the notch surface 22c in the outer peripheral surface of the shaft support part 22a of the rotating shaft 22. As shown in FIG. Thereby, the rotary shaft 22 can be inserted into the shaft hole 24a of the bearing 24 through the slit 24c by aligning the notch surface 22c of the outer peripheral surface of the rotary shaft 22 with the slit 24c of the bearing 24. Thereby, the rotating shaft 22 can be easily attached to the bearing 24 from the direction intersecting the axial direction 25.

  (Effect 3) The notch surface 22c does not match the slit 24c of the bearing 24 when the mirror 6 is at an angle within the normal use range, and matches the slit 24c of the bearing 24 when the mirror 6 is at an angle outside the normal use range. Formed in the position to be. Thereby, when the mirror 6 is in the normal use range, the shaft support portion 22a becomes wider than the width of the slit 24c, so that the rotary shaft 22 can be prevented from being detached from the bearing 24. Therefore, since the mirror 6 can be kept from being removed from the bearing 24 within the normal use range, the head-up display device 2 can be used stably.

DESCRIPTION OF SYMBOLS 2 Head-up display apparatus 6 Mirror 20 Mirror support structure 20a Line contact part 22 Rotating shaft 22a Shaft support part 22b Pointed part 22c Notch surface 24 Bearing 24a Shaft hole 24b Recessed part 24c Slit 25 Axial direction 26 Elastic member

In order to solve the above problems, the present invention provides:
A head-up display comprising: a rotary shaft projecting from both side surfaces of the mirror; a bearing that supports the rotary shaft; and an elastic member that presses the mirror from one side to the other side in the axial direction of the rotary shaft. In the mirror support structure of the device,
The bearing located on the other side has a tapered recess,
It said rotation shaft being pivotally supported by the bearing of the other side, characterized in that abut against a line contact front end side in the circumferential direction with respect to the tapered recess.

Here, the side surface of the bearing 24 is a cylindrical portion that surrounds the outer peripheral surface of the shaft support portion 22 a of the rotating shaft 22 from the outer peripheral side . The slit 24 c is narrower than the diameter of the rotary shaft 22 and is formed at an upper position in the drawing on the side surface of the bearing 24. The slit 24c is formed from the one side in the axial direction 25 toward the other side of the upper side surface of the bearing 24 up to a position on the near side of the recess 24b so as not to reach the recess 24b.

Claims (3)

A head-up display device comprising: a rotary shaft protruding from a side surface of the mirror; a bearing that supports the rotary shaft; and an elastic member that presses the mirror from one side to the other side in the axial direction of the rotary shaft. In the mirror support structure of
The bearing located on the other side has a tapered recess at the back of the shaft hole,
The rotary shaft that is pivotally supported by the bearing on the other side has a sharp pointed portion that is slidably fitted into the tapered concave portion on the distal end side of the pivotal support portion with respect to the shaft hole,
The sharpened portion has a shape different from that of the tapered concave portion, and is in line contact with the tapered concave portion in the circumferential direction. In the mirror support structure of the head-up display device according to claim 1,
The bearing has a slit penetrating between the inside and outside of the shaft hole on a side surface, and the rotating shaft is a notch surface that can be inserted into the shaft hole through the slit from the direction intersecting the axial direction on the outer peripheral surface of the shaft support portion. A mirror support structure for a head-up display device. In the mirror support structure of the head-up display device according to claim 2,
The notch surface is formed at a position that does not match the slit when the mirror is at an angle within the normal use range, and is aligned with the slit when the mirror is at an angle outside the normal use range. Mirror support structure for head-up display device.