JP2016080900A - Angle adjustment mechanism and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized angle adjustment mechanism that can prevent reduction in accuracy of assembly or parts and make power consumption.SOLUTION: According to the present application, an angle adjustment mechanism 300 is provided which adjusts the rotation angle of a mirror 200 having a concave mirror 210 rotatably supported on a bracket 100 with a first rotational axis 201. The angle adjustment mechanism 300 includes: a motor 320; a speed reduction mechanism 330 connected to the motor 320; and an arm 340 swingably supported in a case 310 with a second rotational axis 342 and connected to the speed reduction mechanism 330 and engaged with an engaging part 245 of a frame 220 of the mirror 200 to rotate the mirror 200. By arranging the angle adjustment mechanism 300 within the width of the concave mirror 210, a mirror unit 4 can have a small size.SELECTED DRAWING: Figure 9

Description

  The present invention relates to an angle adjustment mechanism that adjusts the rotation angle of a rotating body and a display device including the same.

  As a display device for a vehicle, a head-up display device that displays a virtual image by projecting display light including optical information emitted from a display onto a windshield such as a windshield is known. This type of head-up display device is generally housed in a dashboard of a vehicle, and has a configuration in which display light emitted from a display device is reflected on a mirror made of a concave mirror and projected onto a windshield. The mirror made of a concave mirror is provided so as to be rotatable about a horizontal rotation axis so that the height position of the virtual image projected on the windshield can be adjusted according to the height of the occupant's viewpoint, and is rotated by a motor. Is known (Patent Document 1).

JP 2011-131651 A

  In the head-up display device described in Patent Document 1, the mirror is rotated by rotating the rotating shaft of the mirror with a motor, and the motor is disposed on the side of the mirror. The output shaft is coaxially and directly coupled to one end of the rotating shaft. However, in such a configuration, since the width dimension becomes larger than the mirror, there is a problem that an increase in space for in-vehicle use and a degree of freedom of dimensions and arrangement positions of other in-vehicle devices associated therewith are caused. . Therefore, it is possible to suppress the overall width by arranging the motor on the back side of the mirror, but in that case, means such as a gear train for connecting the output shaft and the rotation shaft of the motor is required. Therefore, a high level is required for assembly accuracy and component accuracy. Further, the configuration in which the rotating shaft of the mirror is directly driven by a motor requires a motor having a large driving torque, which has a disadvantage that it is difficult to suppress power consumption.

  The present invention has been made in view of the above circumstances, and its main purpose is to provide an angle adjustment mechanism that can suppress assembly accuracy and component accuracy as well as downsizing, and can further save power. Moreover, it is providing the display apparatus provided with such an angle adjustment mechanism.

  The angle adjustment mechanism of the present invention is an angle adjustment mechanism that adjusts the rotation angle of the rotating body by rotating the rotating body that is rotatably supported by the first support body via the first rotating shaft, A drive source and an arm that is swingably supported by a second support member via a second rotation shaft, engages with the rotary member, and rotates the rotary member in accordance with a drive output of the drive source (Claim 1).

  The angle adjustment mechanism of the present invention is an angle adjustment mechanism that adjusts the rotation angle of a rotating body that is rotatable with respect to a first rotation axis, the drive source and a first rotation axis that is parallel to the first rotation axis. And an arm that is slidable with respect to the two rotation shafts and that rotates the rotating body in accordance with a drive output of the drive source (claim 2).

  In the angle adjustment mechanism of the present invention, the rotating body is rotated by an arm that operates according to the drive output of the drive source, and the rotation angle of the rotating body is adjusted. Since the rotating shafts of the rotating body and the arm, that is, the first and second rotating shafts are independently independent, the angle adjusting mechanism can be disposed within the width of the rotating body. Therefore, it can be incorporated without increasing the width, and the size can be reduced. In the present invention, in order to reduce the size as described above, it is preferable that at least a part of the angle adjusting mechanism is disposed within the width of the rotating body (Claim 4). And a mode in which at least a part of the drive source is disposed within the width of the rotating body (Claim 5).

  According to the angle adjustment mechanism of the present invention, since the angle is adjusted by rotating the rotating body with the arm, the mechanism in which the arm rotationally drives the rotating body does not require high accuracy. As described above, a high level of assembly accuracy and component accuracy is not required. Therefore, assembly is facilitated. Further, the driving torque of the driving source may be smaller than in the case where the first rotating shaft of the rotating body is directly driven by a motor, and as a result, power saving is achieved.

  The angle adjustment mechanism of the present invention includes a form in which the second rotation shaft is disposed in the vicinity of the first rotation shaft on the same axis or non-coaxially (Claim 3). In this embodiment, the size can be reduced in a state where the angle adjusting mechanism is incorporated in the rotating body. Further, the loss of stress for the arm to rotate the rotating body is small, and the rotating body is efficiently rotated by the swinging of the arm. Note that the configuration in which the second rotating shaft is disposed in the vicinity in a non-coaxial state with respect to the first rotating shaft has a width as the angle adjusting mechanism is disposed within the width of the rotating body as described above. Expansion is suppressed.

  In addition, the angle adjustment mechanism of the present invention includes a form in which the drive source is disposed so as to overlap the arm with respect to the extending direction of the second rotating shaft. In this form, the dimension in the depth direction perpendicular to the second rotation axis is suppressed, and the size can be reduced.

  In addition, the angle adjustment mechanism of the present invention includes a form provided with a speed reduction mechanism that transmits the drive output of the drive source to the arm. In this embodiment, if the speed reduction mechanism includes a worm gear (Claim 8), the speed reduction mechanism is activated when the worm gear is self-locked to the speed reduction mechanism, the reverse rotation of the speed reduction mechanism is restricted, and the rotating body receives external force. Is prevented from being damaged due to the reverse rotation of the speed reduction mechanism and the drive source.

  Next, a display device according to the present invention is a display device that performs display by reflecting light emitted from a display device by a mirror and projecting it on a windshield of a vehicle, wherein the rotating body is the mirror, The angle adjusting mechanism according to any one of Items 1 to 8 is provided (Claim 9).

  Moreover, the display apparatus of this invention is a display apparatus which projects the light irradiated from a display device on a combiner, and displays, Comprising: The said rotary body is this combiner, The claim 1 in any one of Claims 1-8. An angle adjustment mechanism is provided (claim 10).

  According to the present invention, it is possible to provide an angle adjustment mechanism that can reduce assembly size and component accuracy as well as miniaturize, and further save power, and a display device including the angle adjustment mechanism.

It is a side view showing an outline of a head up display device (HUD) concerning one embodiment of the present invention. It is a perspective view of the concave mirror unit with which HUD of one embodiment is provided. It is a perspective view of the back side of the concave mirror unit (the back plate of the bracket is not shown). It is a rear view (the back plate of a bracket is not shown) of the concave mirror unit. It is a top view of the concave mirror unit. It is a side view of the angle adjustment mechanism which the concave mirror unit comprises. It is a side view which shows the structure of the same angle adjustment mechanism. It is a perspective view which shows the structure of the same angle adjustment mechanism. It is a figure which shows the effect | action of the same angle adjustment mechanism, Comprising: It is sectional drawing of the IX-IX arrow part of FIG. It is a side view which shows the outline | summary of the other HUD to which the angle adjustment mechanism which concerns on one Embodiment is applied.

  Hereinafter, an embodiment in which a display device including an angle adjustment mechanism of the present invention is applied to a head-up display device will be described with reference to the drawings.

[1] Overall Configuration of Head-Up Display Device FIG. 1 is a diagram showing an outline of a head-up display device (display device, hereinafter abbreviated as HUD) 1 according to an embodiment. A state in which it is set in a dashboard (not shown) of a vehicle having a shield (G) is shown.

  The HUD 1A includes a display 2 made of a projector or the like, a reflection mirror 3 made of a plane mirror, a mirror unit 4 having a concave mirror 210, and a housing 5 that accommodates the display 2, the reflection mirror 3, and the mirror unit 4. . According to the HUD 1A, the display light L generated by the display device 2 is projected onto the windshield G from the exit port 5a at the top of the housing 5 through the reflection mirror 3 and the concave mirror 210. The display light L is reflected by the windshield G toward the driver P, and a virtual image V based on the display light L is displayed in front of the windshield G. The driver P visually recognizes the virtual image V superimposed on the scenery in front and obtains information for driving. The information displayed by the virtual image V is, for example, various vehicle information (speed, travel distance, etc.), navigation information, and the like.

[2] Configuration of Mirror Unit Next, the configuration of the mirror unit 4 will be described.
As shown in FIGS. 2 to 5, the mirror unit 4 is rotatable via a bracket (first support) 100 and a first rotating shaft 201 including a pair of convex shafts 232 and 236 on the bracket 100. A mirror (rotating body) 200 including a supported concave mirror 210 and an angle adjusting mechanism 300 that adjusts the rotation angle by rotating the mirror 200 around a first rotation shaft 201 are provided.

  The bracket 100 is formed in a horizontally-long rectangular box shape having a bottom plate 110, side plates 120 on both sides, and a back plate 130. The mirror 200 includes a horizontally long plate-like concave mirror 210 having a reflecting surface 211 formed with a predetermined curvature, and a frame 220 on which the concave mirror 210 is fitted and fixed. The mirror 200 is accommodated in the bracket 100 with the frame 220 facing the back plate 130 side.

  As shown in FIG. 1, the bracket 100 has a width direction parallel to the left-right direction of the vehicle (the front and back direction in FIG. 1) in the dashboard, and the reflecting surface 211 of the concave mirror 210 is located behind the vehicle, that is, the driver P. It is set to be inclined in a direction and obliquely upward. 2 indicate the width direction (left-right direction), depth direction (front-rear direction), and height direction of the bracket 100, respectively.

  The frame 220 of the mirror 200 mainly includes a frame portion 230 formed in a curved shape along the shape of the concave mirror 210, and the concave mirror 210 is fitted and fixed to the front side of the frame portion 230. As shown in FIGS. 3 to 5, on the rear surface of the frame portion 230, there is a beam portion 240 that bulges and extends from the center portion toward the side end surface 231 on one side (left side in FIGS. 3 and 5). It is formed integrally with the portion 230. The beam portion 240 is formed at the center in the height direction of the frame portion 230. As shown in FIGS. 4 and 5, the end portion of the beam portion 240 protrudes laterally from the side end surface 231, and a convex shaft 232 protruding laterally is formed on the end surface. Further, a convex shaft 236 protruding sideways is formed coaxially with the convex shaft 232 on the side end surface 235 on the other side (right side in FIGS. 4 and 5) of the frame portion 230.

  The left and right convex shafts 232 and 236 are respectively inserted into shaft holes 122 and 126 formed in the left and right side plates 120 of the bracket 100, whereby the mirror 200 is rotatably supported by the bracket 100 about the convex shafts 232 and 236. Has been. In the present embodiment, a first rotating shaft 201 of the mirror 200 is configured by a pair of left and right convex shafts 232 and 236 that are coaxial with each other.

  An axis 201A (shown in FIG. 5) of the first rotating shaft 201 extends in parallel to the width direction of the bracket 100, that is, the left-right direction of the vehicle. Therefore, the width direction of the concave mirror 210 itself (indicated by the line 210A in FIG. 5) is inclined with respect to the axis 201A of the first rotating shaft 201, and the curved concave mirror 210 on the side where the beam portion 240 is formed and An end portion of the frame 220 protrudes from the bracket 100. In the bracket 100, a space is formed between the back surface of the frame 220 protruding from the bracket 100 and the back plate 130 of the bracket 100, and the angle adjusting mechanism 300 is disposed in this space. Hereinafter, the angle adjustment mechanism according to the present invention will be described.

[3] Angle Adjustment Mechanism [3-1] Configuration As shown in FIG. 4, the angle adjustment mechanism 300 is placed on and fixed to two columns 111 that are erected on the bottom plate 110 of the bracket 100. As shown in FIGS. 6 to 8, the angle adjustment mechanism 300 includes a case (second support) 310 fixed to the column 111, a motor (drive source) 320 housed in the case 310, and a speed reduction mechanism 330. And an arm 340. The case 310 is composed of a combination of a case main body 311 and a lid body 315, and the case main body 311 and the lid body 315 are respectively placed on and fixed to the columns 111. As shown in FIG. 4, the angle adjusting mechanism 300 is disposed within the width of the mirror 200 in this fixed state.

  As shown in FIG. 7, the arm 340 extends substantially in the vertical direction, and a second rotating shaft 342 whose axis extends in the left-right direction (X direction in FIG. 2) is formed at the upper end portion. The second rotation shaft 342 is rotatably supported by a bearing (not shown) provided in the case 310 in a state parallel to the first rotation shaft 201. The arm 340 is supported in the case 310 so as to be swingable in the front-rear direction (Y direction in FIG. 2) as indicated by an arrow A via the second rotation shaft 342. On the lower end surface of the arm 340, a worm wheel 335 formed of helical gear teeth concentric with the second rotating shaft 342 is formed. The second rotating shaft 342 is non-coaxial with the first rotating shaft 201 and is disposed close to the first rotating shaft 201.

  As shown in FIG. 8, the arm 340 is swung by a motor 320 fixed in the case 310. Between the motor 320 and the arm 340, a speed reduction mechanism 330 including a gear train that decelerates the rotation of the motor 320 and transmits it to the arm 340 is interposed. The motor 320 is disposed on the side of the arm 340 with the drive shaft 322 to which the drive gear 321 is fixed facing the rear mirror 200 side. The reduction mechanism 330 includes a two-stage spur gear 331 that meshes with the drive gear 321, spur gears 332 and 333 that sequentially mesh with the spur gear 331, a worm gear 334 that is coaxial with and integral with the spur gear 333, and a worm gear 334. It is comprised from the said worm wheel 335 which meshes | engages. The axes of the gears 331 to 335 are parallel to the drive shaft 322 of the motor 320 and extend in the front-rear direction. Each gear 331 to 335 is rotatably supported by a bearing provided in the case 310.

  The drive shaft 322 of the motor 320 is urged toward the motor 320 by the leaf spring 325 so that axial backlash is suppressed. One end of the plate spring 325 is fixed to the inside of the lid 315 of the case 310, and the other end is provided so as to elastically contact the tip of the drive shaft 322.

  When the motor 320 rotates, the rotation is transmitted to the arm 340 via the speed reduction mechanism 330, and the arm 340 is centered on the second rotation shaft 342 according to the rotation direction of the motor 320 as indicated by an arrow A in FIG. Swings back and forth. A cylindrical boss 341 extending in the lateral direction is formed on the side surface of the swinging end portion, that is, the lower end portion of the swinging arm 340 on the side opposite to the motor 320 side. As shown in FIG. 6, the boss 341 protrudes from the case 310 through a slit 312 formed in the case body 311 extending in the front-rear direction. The boss 341 is fitted in a groove 246 formed in the beam portion 240 of the frame 220 of the mirror 200, as shown in FIGS.

  As shown in FIGS. 3 and 4, an arch portion 241 protruding upward is formed on the beam portion 240, and the angle adjusting mechanism 300 is arranged in a state where the upper portion enters the arch portion 241. Further, the beam portion 240 has an engaging portion 245 protruding downward on the side of the angle adjusting mechanism 300 on the side where the boss 341 is formed. As shown, a groove 246 that opens in the left-right direction and downward is formed. The boss 341 of the angle adjusting mechanism 300 is fitted in the groove 246, and the arm 340 is engaged with the engaging portion 245 via the boss 341.

  The boss 341 moves in the front-rear direction as the arm 340 swings. When the boss 341 moves back and forth, the boss 341 comes into contact with the inner surface of the groove 246 and moves the engaging portion 245 back and forth, so that the mirror 200 moves the first rotation shaft 201 as shown by an arrow B in FIG. The rotation angle, that is, the tilt angle of the mirror 200 is adjusted. For example, the mirror 200 is biased so that the lower end of the frame 220 is always rotated in a fixed direction by an elastic body such as a spring, so that the boss 341 always abuts against the inner surface of the groove 246 and receives vibration. There is no play. Further, the backlash of the gear train of the speed reduction mechanism 330 is also suppressed by the action of the elastic body.

  In the angle adjustment mechanism 300, once the vehicle is turned on, the arm 340 once swings to the back plate 130 side (front side of the vehicle) and contacts the contact switch 350 as shown in FIG. The arm 340 is turned on and stopped, and the position is set as the operation origin position. The rotation angle of the arm 340 is controlled from this origin position.

[3-2] Operation According to the angle adjustment mechanism 300, when the switch of the motor 320 is turned on and the drive gear 321 rotates, the rotation is transmitted to the worm gear 334 via the gears 331 to 333, and the worm gear 334 rotates. As a result, the worm wheel 335 rotates. When the worm wheel 335 rotates, the arm 340 swings, and the boss 341 engages with the engaging portion 245 of the frame 220 and pushes and pulls in the front-rear direction, so that the rotation angle of the mirror 200 is adjusted as described above. . The adjustment range of the rotation angle of the mirror 200 is, for example, about 3 ° to 7 °. For example, by increasing the number of teeth of the worm wheel 335, the rotation angle of the arm 340, that is, the rotation angle of the mirror 200 can be further increased.

  By adjusting the tilt angle of the mirror 200 in this way, the height position of the virtual image V projected in front of the windshield G can be adjusted according to the height of the viewpoint of the driver P.

[3-3] Operational Effect According to the angle adjustment mechanism 300 of the present embodiment, the rotation axes of the mirror 200 and the arm 340, that is, the first rotation axis 201 and the second rotation axis 342 are separately made independent. Therefore, the angle adjusting mechanism 300 can be disposed on the back side within the width of the mirror 200. Further, the second rotation shaft 342 of the arm 340 is disposed in the vicinity of the first rotation shaft 201 of the mirror 200. With these configurations, the angle adjustment mechanism 300 can be incorporated into the mirror 200 without increasing the width, and the size including the motor 320 can be reduced. Further, by reducing the size of the motor 320, the angle adjusting mechanism 300 can be installed by effectively utilizing the dead space on the back side of the mirror 200 in the bracket 100.

  In addition, since the mirror 200 is rotated by the arm 340 to adjust the angle, the engagement state between the two is not required to have high accuracy. For this reason, the arm 340 and the engagement portion 245 include, for example, the motor output shaft and the rotation shaft. A high level of assembly accuracy and component accuracy is not required, such as a motion transmission means including a gear train for connecting the two. As a result, assembly is facilitated. In addition, compared with a case where the first rotating shaft 201 of the mirror 200 is driven by a motor directly connected coaxially, the engaging portion 245 separated from the first rotating shaft 201 is pushed by the boss 341 of the arm 340. Since the mirror 200 is rotated by pulling, the driving torque of the motor 320 can be reduced, and as a result, power saving can be achieved.

  Further, as described above, since the second rotating shaft 342 of the arm 340 is disposed in the vicinity of the first rotating shaft 201 of the mirror 200, the stress loss for the arm 340 to rotate the mirror 200 is reduced. The mirror 200 is small, and the mirror 200 is efficiently rotated by the swing of the arm 340. The second rotating shaft 342 may be arranged coaxially with the first rotating shaft 201. In the case of being coaxial, the rotational trajectory of the arm 340 and the mirror 200 does not deviate. Since friction of the boss 341 against the inner surface does not occur, stress loss does not occur and the operating efficiency is the highest. Therefore, in the case of non-coaxial, it is desirable that the second rotation shaft 342 is as close as possible to the first rotation shaft 201.

  Moreover, since the speed reduction mechanism 330 includes the worm gear 334, the speed reduction mechanism 330 is self-locked, and the reverse rotation of the speed reduction mechanism 330 is restricted. For this reason, when the mirror 200 receives external force, damage to the speed reduction mechanism 330 and the motor 320 due to the reverse rotation of the speed reduction mechanism 330 is prevented.

[4] Other Application Examples A so-called HUD uses a device having an optical element called a combiner in addition to the type as in the above embodiment, and the angle adjustment mechanism of the present invention has such a type. It can also be applied to HUD.

  FIG. 10 is a view showing an outline of the HUD 1B using such a combiner 6, and shows a state in which the HUD 1B is set on the windshield G of the vehicle.

  The HUD 1B includes an image display 7, a reflective intermediate image screen 8, and a combiner 6. The display 7 and the reflective intermediate image screen 8 are accommodated in a housing 9 and set in a dashboard (not shown) of the vehicle.

  According to this HUD 1B, the display light L generated by the display device 7 is imaged on the reflective intermediate image screen 8 to form a real image, and the display light L indicating the image passes through the exit 9a of the housing 9. And it is projected on the combiner 6. In the combiner 6, the external light incident through the windshield G is transmitted and the display light L is reflected. Based on the display light L in front of the windshield G in front of the driver P who visually recognizes the combiner 6. A virtual image V is displayed. The driver P visually recognizes the virtual image V superimposed on the scenery in front and obtains information for driving indicated by the virtual image V.

  The combiner 6 is a half mirror composed of a concave mirror, and like the mirror 200 including the concave mirror 210 of the above-described embodiment, the combiner 6 is centered on a rotation axis (the first rotation axis of the present invention) extending in parallel with the left-right direction of the vehicle. It is provided rotatably. And the height position of the virtual image V can be adjusted according to the height of the viewpoint of the driver P by adjusting the rotation angle, that is, the tilt angle. Here, the angle adjustment mechanism 300 of the above-described embodiment can be applied to the combiner 6 to adjust the inclination angle of the combiner 6. That is, in that case, the combiner 6 constitutes the rotating body of the present invention.

[5] Others The above embodiment shows an example in which the angle adjustment mechanism 300 is applied to the HUD as shown in FIGS. 1 and 10. However, as the HUD to which the angle adjustment mechanism of the present invention is applied, these may be used. The present invention is not limited to the one having an optical system configured as HUD 1A, 1B, and can be applied to various types of HUDs. The angle adjustment mechanism of the present invention is not limited to the HUD, and can be appropriately applied to an apparatus that adjusts the rotation angle by rotating a rotating body. Examples of such a rotating body include a display of a car navigation device, a movable antenna, a heliostat of solar thermal power generation, and the like.

1A, 1B ... HUD: Head-up display device (display device)
2, 7 ... Display 6 ... Combiner (rotary body)
100 ... Bracket (first support)
200 ... Mirror (rotating body)
201 ... first rotating shaft 210 ... concave mirror 220 ... frame 245 ... engaging portion 300 ... angle adjusting mechanism 310 ... case (second support)
320: Motor (drive source)
330 ... Deceleration mechanism 334 ... Worm gear 340 ... Arm 342 ... Second rotating shaft G ... Windshield (windshield)

Claims (10)

An angle adjustment mechanism for adjusting a rotation angle of the rotating body by rotating a rotating body rotatably supported by the first support body via a first rotating shaft,
A driving source;
An arm that is swingably supported by a second support member via a second rotating shaft, engages with the rotating member, and rotates the rotating member according to the drive output of the drive source;
An angle adjustment mechanism comprising: An angle adjustment mechanism for adjusting a rotation angle of a rotating body that is rotatable with respect to a first rotation axis, comprising: a drive source;
An arm that is slidable with respect to a second rotating shaft parallel to the first rotating shaft and rotates the rotating body in accordance with a driving output of the driving source;
An angle adjustment mechanism comprising:   The angle adjusting mechanism according to claim 1, wherein the second rotation shaft is disposed in the vicinity of the first rotation shaft on the same axis or in a non-coaxial state.   The angle adjusting mechanism according to claim 1, wherein at least a part of the angle adjusting mechanism is disposed within a width of the rotating body.   The angle adjustment mechanism according to any one of claims 1 to 4, wherein at least a part of the arm and the drive source is disposed within a width of the rotating body.   The angle adjusting mechanism according to any one of claims 1 to 4, wherein the driving source is disposed so as to overlap the arm with respect to an extending direction of the second rotating shaft.   The angle adjustment mechanism according to claim 1, further comprising a speed reduction mechanism that transmits a drive output of the drive source to the arm.   The angle adjustment mechanism according to claim 7, wherein the speed reduction mechanism includes a worm gear. A display device that performs display by reflecting light emitted from a display device with a mirror and projecting it on a windshield of a vehicle,
The display device comprising the angle adjusting mechanism according to claim 1, wherein the rotating body is the mirror. A display device that performs display by projecting light emitted from a display onto a combiner,
The display device, wherein the rotating body is the combiner and includes the angle adjusting mechanism according to claim 1.

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