Mirror unit

Abstract

Provided is a mirror unit capable of maintaining good vibration proof. A mirror unit 20 comprises a reflecting mirror 13, and a holder 30 that holds the reflecting mirror 13 from a back surface 13b thereof. The mirror unit 20 rotates about an axis AX by the holder 30 being pressed by a linearly moving slider, and is provided in a head-up display device. The holder 30 comprises a part to be pressed 34, a first support part 31, and a second support part 32. The part to be pressed 34 is located at a position that deviates from a center C of the reflecting mirror 13 toward a first end E1 of the reflecting mirror 13, and is pressed by the slider. The first support part 31 is located at a position corresponding to the part to be pressed 34, and is affixed to the back surface 13b. The second support part 32 is located closer to a second end E2 of the reflecting mirror 13 than the first support part 31, has a larger outer shape than the first support part 31, and is affixed to the back surface 13b.

Description

Technical Field

[0001] The present disclosure relates to a mirror unit, and more particularly to a mirror unit provided in a head-up display device.

Background Art

[0002] For example, Patent Document 1 describes a mirror unit including a holder that holds a mirror from the back. This mirror unit is rotatable about an axis by pressing a pressed portion (arm portion 31d in Patent Document 1) provided on the holder. This holder has a bilaterally symmetric shape.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Due to layout constraints, there may be cases where the pressed portion has to be arranged at a position deviated from the center of the mirror. In this case, if the holder has a bilaterally symmetric shape, the natural frequency may decrease at the end of the mirror located far from the pressed portion, and there is a risk that the vibration resistance cannot be maintained.

[0005] An object of the present disclosure is to provide a mirror unit that can maintain good vibration resistance.

Means for Solving the Problems

[0006] To achieve the above object, the mirror unit according to the present disclosure includes: a mirror; a holder that holds the mirror from the back thereof, A mirror unit provided in a head-up display device, wherein the holder is pushed by a linearly moving slider, causing it to rotate around an axis, The aforementioned holder is, A pressed portion is located at an offset position from the center of the reflector toward the first end of the reflector in the direction in which the axis extends, and is pressed by the slider, A first support portion is located in a position corresponding to the pressed portion and is fixed to the back surface, The second support portion is located closer to the second end of the reflecting mirror, opposite to the first end, than the first support portion, has a larger outer diameter than the first support portion, and is fixed to the back surface. 、 The first support portion is fixed to the back surface by the first double-sided tape, The second support portion is fixed to the back surface by the second double-sided tape. The second double-sided tape is formed in a frame shape having an opening, The area of ​​the first double-sided tape is less than or equal to the area of ​​the opening. ru.

[0007] In the first configuration, the mirror unit relating to the present disclosure as the second configuration is The first support portion is fixed to the back surface by the first double-sided tape, The second support portion is fixed to the back surface by the second double-sided tape. The second double-sided tape is formed in a frame shape having an opening, The area of ​​the first double-sided tape is less than or equal to the area of ​​the opening.

[0008] In the first or second configuration, the mirror unit relating to this disclosure as the third configuration is: The outer shape of the first support portion and the second support portion are rectangular.

[0009] In any of the first to third configurations, the mirror unit relating to this disclosure as the fourth configuration is: The upper end of the second support portion is closer to the upper end of the reflector than the upper end of the first support portion.

[0010] In any of the first to fourth configurations, the mirror unit according to the present disclosure as the fifth configuration is Of the two regions obtained by dividing the outer shape of the second support portion along the axis, one that is close to the upper end of the reflecting mirror is defined as the first region, and the other is defined as the second region. The area of the first region is larger than the area of the second region.

[0011] In any of the first to fifth configurations, the mirror unit according to the present disclosure as the sixth configuration is The center of gravity of the outer shape of the first support portion is located at a position offset from the center of the reflecting mirror in the direction in which the axis extends, toward the first end. The center of gravity of the outer shape of the second support portion is located at a position offset from the center of the reflecting mirror in the direction in which the axis extends, toward the second end.

Advantages of the Invention

[0012] According to the present disclosure, good vibration resistance can be maintained.

Brief Description of the Drawings

[0013] [Figure 1] Schematic configuration diagram of a head-up display (HUD) device according to an embodiment of the present disclosure. [Figure 2] Rear view of the mirror unit according to the same embodiment. [Figure 3] Diagram showing the arrangement of the first double-sided tape and the second double-sided tape according to the same embodiment.

Modes for Carrying Out the Invention

[0014] An embodiment of the present disclosure will be described with reference to the drawings.

[0015] The head-up display (HUD) device 10 shown in Figure 1 is installed, for example, on the dashboard of a vehicle. The HUD device 10 emits display light L toward the vehicle's windshield. The display light L reflected by the windshield allows the user to see a virtual image of the image represented by the display light. The virtual image is displayed in front of the vehicle via the windshield, and various information about the vehicle can be presented.

[0016] The HUD device 10 comprises a display unit 11, a mirror unit 20 having an optical path changing mirror 12 and a reflecting mirror 13, a slider 14, and a housing 15.

[0017] The display unit 11 emits display light L representing an image by displaying that image. The display unit 11 is composed of, for example, an LCD (Liquid Crystal Display) and a backlight that illuminates the LCD from behind. The LCD is, for example, a TFT (Thin Film Transistor) type. The backlight is composed of, for example, an LED (Light Emitting Diode), a light guide member, etc.

[0018] The optical path changing mirror 12 changes the optical path of the display light L emitted from the display unit 11. Specifically, the display light L reflected by the optical path changing mirror 12 is directed towards the reflecting mirror 13. The optical path changing mirror 12 consists of a plane mirror or a curved mirror and is fixed to the housing 15 via a component not shown.

[0019] The reflector 13 reflects the display light L from the optical path changing mirror 12 toward the vehicle's windshield. The reflector 13 is, for example, a concave mirror, and reflects the display light L with its reflective surface 13a facing the optical path changing mirror 12. Due to the function of the concave mirror, the virtual image is perceived by the user as an enlarged version of the image displayed on the display unit 11.

[0020] The slider 14 is configured to move linearly in the X direction as shown in Figure 1, and by pressing the holder 30 (described later), it rotates the mirror unit 20 around the axis AX. The slider 14 can reciprocate along the X direction by a drive mechanism (not shown). The drive mechanism includes a motor, a conversion mechanism that converts the rotational motion of the motor into linear motion, etc. The conversion mechanism consists of a lead screw, a ball screw, etc., and moves the slider 14 back and forth along the X direction.

[0021] The HUD device 10 includes a control unit (not shown) that controls the reciprocating movement of the slider 14 by controlling the operation of the motor of the drive mechanism. The control unit can adjust the vertical display position of the virtual image as seen by the user by adjusting the rotation position of the reflector 13, which changes in accordance with the movement of the slider 14. The control unit is composed of, for example, a microcomputer and also controls the display operation of the display unit 11.

[0022] The housing 15 houses the display unit 11, the optical path changing mirror 12, the slider 14, and the mirror unit 20. The housing 15 is formed in a box shape from synthetic resin, metal, or the like, and has light-shielding properties. The housing 15 may be composed of a combination of multiple components. The housing 15 is provided with an opening 15a that opens toward the windshield. A light-transmitting plate 15b is attached to the housing 15 to cover the opening 15a. The display light L emitted from the display unit 11 and reflected in the order of the optical path changing mirror 12 and the reflector 13 passes through the light-transmitting plate 15b and is radiated toward the windshield.

[0023] (Mirror unit 20) The mirror unit 20 comprises a reflector 13, a holder 30, and the first double-sided tape 41 and second double-sided tape 42 shown in Figure 3. The back surface 13b is located behind the reflective surface 13a of the reflector 13.

[0024] The holder 30 is made of a metal material such as magnesium or a synthetic resin material and holds the reflector 13 from the back surface 13b. As shown in Figure 2, the holder 30 includes a first support portion 31, a second support portion 32, a connecting portion 33, a pressed portion 34, a first axis forming portion 35, and a second axis forming portion 36.

[0025] The pressed portion 34 is the part that is pressed by the slider 14, and as shown in Figure 1, it is a lever-shaped portion that hangs down from the holder 30. The slider 14 is located below the pressed portion 34 and has a structure that clamps onto the pressed portion 34. With this structure, when the slider 14 moves to the right in Figure 1, it can press the pressed portion 34 from the left, and when it moves to the left in Figure 1, it can press the pressed portion 34 from the right. Insofar as the pressed portion 34 can be pressed by the linearly moving slider 14, the shape and structure of the slider 14 and the pressed portion 34 are not limited and can be arbitrarily changed.

[0026] Here, the left end of the reflector 13 in Figure 2 is referred to as the first end E1, and the right end of the reflector 13 in Figure 2 is referred to as the second end E2. The pressed portion 34 is positioned offset from the center C (center line) of the reflector 13 in the direction in which the axis AX extends toward the first end E1.

[0027] The first support portion 31 is the part fixed to the back surface 13b of the reflector 13. The outer shape of the first support portion 31 is rectangular, as shown by the dashed line in Figure 2. The first support portion 31 is located in a position corresponding to the pressed portion 34. Specifically, the first support portion 31 is located above the pressed portion 34. Note that the first support portion 31 being "located in a position corresponding to the pressed portion 34" means that the first support portion 31 is located above the pressed portion 34 and that the pressed portion 34 is located within the width range of the first support portion 31 in the direction along the axis AX. The first support portion 31 is located on the axis AX.

[0028] The second support portion 32 is located closer to the second end E2 of the reflector 13 than the first support portion 31 and is fixed to the back surface 13b. The outer shape of the second support portion 32 is rectangular, as shown by the dashed line in Figure 2, and is larger than the outer shape of the first support portion 31. Specifically, the second support portion 32 has a larger outer surface area and at least a greater height (vertical length in Figure 2) than the first support portion 31. Also, the second support portion 32 is located on the axis AX.

[0029] Here, if the second support portion 32 were formed to be the same size as the first support portion 31 and both were placed on the axis AX, the natural frequency of the second end E2 of the reflecting mirror 13, which is far from the pressed portion 34 (especially the upper part of the second end E2), would decrease, and vibration resistance might not be maintained. However, by providing the holder 30 with a second support portion 32 that is larger in outer diameter than the first support portion 31 as described above, the back surface 13b of the reflecting mirror 13 can be supported up to a position closer to the second end E2. Therefore, according to the mirror unit 20 of this embodiment, a decrease in the natural frequency near the second end E2 can be prevented, and vibration resistance can be maintained well.

[0030] The connecting portion 33 is the part that connects the first support portion 31 and the second support portion 32, and is a strip-shaped portion that is shorter in height (length in the vertical direction in Figure 2) than the first support portion 31. In this embodiment, the center C (center line) of the reflector 13 is located on the connecting portion 33. In other words, in this embodiment, the first support portion 31 and the second support portion 32 are located on either side of the center C of the reflector 13.

[0031] In this embodiment, the first support portion 31 and the second support portion 32 of the holder 30 further satisfy the following conditions.

[0032] The upper end 32u of the second support portion 32 is closer to the upper end Eu of the reflector 13 than the upper end 31u of the first support portion 31. With this configuration, it is possible to prevent a decrease in the natural frequency of the upper part of the second end E2, and to maintain good vibration resistance.

[0033] Furthermore, if the outer shape of the second support portion 32 is divided along the axis AX to obtain two regions, and one of them, which is closer to the upper end Eu of the reflector 31, is designated as the first region R1, and the other as the second region R2, then the area of ​​the first region R1 is larger than the area of ​​the second region R2. With this configuration, in particular, a decrease in the natural frequency of the upper part of the second end E2 can be prevented, and vibration resistance can be maintained well.

[0034] Furthermore, the center of gravity G1 of the outer shape of the first support portion 31 (rectangular in this embodiment) is located off-center from the center C of the reflector 13 toward the first end E1, and the center of gravity G2 of the outer shape of the second support portion 32 (rectangular in this embodiment) is located off-center from the center C of the reflector 13 toward the second end E2. This configuration prevents a decrease in the natural frequency of the second end E2 and maintains good vibration resistance. Moreover, in this embodiment, this effect is made more pronounced by setting the center of gravity G2 of the outer shape of the second support portion 32 closer to the upper end Eu of the reflector 13 than the axis AX.

[0035] The first shaft forming portion 35 is a part that extends from the first support portion 31 to the first end E1. The first shaft forming portion 35 has a shaft portion 35a at its tip, which is located beyond the first end E1. The shaft portion 35a is a cylindrical part along the axis AX.

[0036] The second shaft forming portion 36 is a part that extends from the second support portion 32 to the second end E2. The second shaft forming portion 36 has a shaft portion 36a at its tip, which is located beyond the second end E2. The shaft portion 36a is a cylindrical part along the axis AX.

[0037] The pair of shafts 35a and 36a are rotatably supported by bearings (not shown) provided on the housing 15. As a result, the mirror unit 20 is rotatably mounted on the housing 15 about axis AX.

[0038] Figure 3 shows the arrangement of the first double-sided tape 41 and the second double-sided tape 42 with dashed lines. The first double-sided tape 41 fixes the first support part 31 to the back surface 13b of the reflector 13. In other words, the first double-sided tape 41 is positioned between the first support part 31 and the back surface 13b. The second double-sided tape 42 fixes the second support part 32 to the back surface 13b of the reflector 13. In other words, the second double-sided tape 42 is positioned between the second support part 32 and the back surface 13b.

[0039] The second double-sided tape 42 is formed in a frame shape with an opening 42a. The outer shape of the second double-sided tape 42 is rectangular, and the opening 42a is also rectangular. The first double-sided tape 41 is rectangular, and its area is approximately equal to (including exactly equal to) the area of ​​the opening 42a. In this way, when the second double-sided tape 42 is cut from the double-sided tape sheet, the portion with the opening 42a can be used as the first double-sided tape 41. This eliminates waste during part manufacturing and creates cost advantages. Note that the area of ​​the first double-sided tape 41 does not need to be greater than or equal to the area of ​​the opening 42a.

[0040] The outer shape of the first double-sided tape 41 should be the same as the outer shape of the first support portion 31, or slightly smaller than the outer shape so as not to protrude from the first support portion 31. Similarly, the outer shape of the second double-sided tape 42 should be the same as the outer shape of the second support portion 32, or slightly smaller than the outer shape so as not to protrude from the second support portion 32.

[0041] In this embodiment, the holder 30 is aligned with the reflector 13 using a jig (not shown), and then fixed to the back surface 13b by the first double-sided tape 41 and the second double-sided tape 42. In this embodiment, the holder 30 supports the reflector 13 only at the installation portions of the first double-sided tape 41 and the second double-sided tape 42. Here, the portion of the second support portion 32 facing the back surface 13b that corresponds to the opening 42a of the second double-sided tape 42 (hereinafter referred to as the opening equivalent portion) faces the back surface 13b without the double-sided tape in between. If this opening equivalent portion comes into contact with the back surface 13b, it can cause wear and noise. To suppress this, it is preferable to ensure the thickness of the second double-sided tape 42 and to form the opening equivalent portion in a concave shape away from the back surface 13b, or at least one of these.

[0042] The above describes an example of positioning the holder 30 and the reflector 13 using a jig. However, positioning may also be performed using a positioning pin provided on one of the holder 30 and the reflector 13, and a positioning hole provided on the other that engages with the pin. In other words, there may be a configuration in which the holder 30 and the reflector 13 are in contact with areas other than the first double-sided tape 41 and the second double-sided tape 42.

[0043] This disclosure is not limited to the embodiments and drawings described above. Appropriate modifications (including the deletion of components) can be made to the embodiments without altering the essence of this disclosure.

[0044] As long as the second support portion 32 is located closer to the second end E2 of the reflector 13 than the first support portion 31 and has a larger outer diameter than the first support portion 31, the shape and arrangement of the first support portion 31 and the second support portion 32 can be arbitrarily changed. Similarly, the shape and arrangement of the first double-sided tape 41 and the second double-sided tape 42 can also be arbitrarily changed in accordance with the changes to the first support portion 31 and the second support portion 32.

[0045] For example, the outer shapes of the first support portion 31 and the second support portion 32 are not limited to a rectangular shape, but may be a perfect circle, ellipse, triangle, polygon, or the like.

[0046] For example, the first support portion 31 and the second support portion 32 may be directly connected without the connecting portion 33. Furthermore, either the first support portion 31 or the second support portion 32 may be located on the center C of the reflecting mirror 13. Even under these conditions, by adjusting conditions such as the upper end 32u of the second support portion 32, the first region R1 of the second support portion 32, and the center of gravity G2 of the outer shape of the second support portion 32, it is possible to prevent a decrease in the natural frequency near the second end E2 and maintain good vibration resistance of the mirror unit 20.

[0047] The above example shows a holder 30 having two support parts, but the holder 30 may have three or more support parts. In such a case, it is sufficient that among the three or more support parts, there is one that satisfies the conditions of the first support part 31 and the second support part 32. The same approach applies to the first double-sided tape 41 corresponding to the first support part 31 and the second double-sided tape 42 corresponding to the second support part 32.

[0048] Furthermore, if the holder 30 is provided with three or more support parts, these support parts can be made progressively larger from the first end E1 to the second end E2, and the shapes of the double-sided tapes attached to each can be nested, thereby eliminating waste during part manufacturing and creating cost advantages. In such cases, it is sufficient that among the three or more double-sided tapes, one satisfies the conditions of the first double-sided tape 41 and the second double-sided tape 42.

[0049] Furthermore, the first support portion 31 and the second support portion 32 may be fixed to the back surface 13b of the reflector 13 by means other than double-sided tape, such as adhesive or tack.

[0050] In the optical path of the display light L connecting the display unit 11 and the reflector 13, the number of mirrors used, how the optical path of the display light L is folded, etc., can be appropriately changed according to the design.

[0051] The above describes an example in which the reflecting mirror 13 of the mirror unit 20 is a concave mirror, but the reflecting mirror 13 may also be a curved mirror, a flat mirror, or the like.

[0052] The display unit 11 is not limited to using an LCD, but may also use an OLED (Organic Light-Emitting Diode). Furthermore, the display unit 11 may also use a reflective display device such as a DMD (Digital Micromirror Device) or LCOS (Liquid Crystal On Silicon).

[0053] The projection target of the display light L is not limited to the vehicle's windshield, but may also be a combiner composed of a plate-shaped half-mirror, a holographic element, or the like.

[0054] The type of vehicle on which the HUD device 10 is installed is not limited. The HUD device 10 can be installed in various vehicles, such as four-wheeled vehicles and two-wheeled vehicles. In addition, the HUD device 10 may be installed in vehicles other than vehicles, such as aircraft and ships.

[0055] In the above explanation, explanations of publicly known technical matters have been omitted where appropriate to facilitate understanding of this disclosure. [Explanation of symbols]

[0056] 10...Head-Up Display (HUD) device, L...Display light 11...Display section 13...Reflector, 13a...Reflection surface, 13b...Back side C...center, E1...first end, E2...second end, Eu...top end 14... Slider 20...Mirror unit, AX...Axis 30... Holder 31...1st support part, 31u...upper end, G1...center of gravity 32...Second support part, 32u...Upper end, G2...Center of gravity, R1...First region, R2...Second region 34... Pressed part 41...First double-sided tape, 42...Second double-sided tape, 42a...Opening

Claims

1. A reflector, The system includes a holder that holds the reflecting mirror from its back surface, A mirror unit provided in a head-up display device, wherein the holder is pushed by a linearly moving slider, causing it to rotate around an axis, The aforementioned holder is, A pressed portion is located at an offset position from the center of the reflector toward the first end of the reflector in the direction in which the axis extends, and is pressed by the slider, A first support portion is located in a position corresponding to the pressed portion and is fixed to the back surface, The second support portion is located closer to the second end of the reflecting mirror, opposite to the first end, than the first support portion, has a larger outer diameter than the first support portion, and is fixed to the back surface. The first support portion is fixed to the back surface by the first double-sided tape, The second support portion is fixed to the back surface by the second double-sided tape. The second double-sided tape is formed in a frame shape having an opening, The area of ​​the first double-sided tape is less than or equal to the area of ​​the opening. Mirror unit.

2. The outer shape of the first support portion and the second support portion are rectangular. The mirror unit according to claim 1.

3. The upper end of the second support portion is closer to the upper end of the reflector than the upper end of the first support portion. The mirror unit according to claim 1.

4. If, of the two regions obtained by dividing the outer shape of the second support portion along the axis, one of them, which is closer to the upper end of the reflecting mirror, is designated as the first region, and the other as the second region, The area of ​​the first region is larger than the area of ​​the second region. The mirror unit according to claim 1.

5. The center of gravity of the outer shape of the first support portion is located at a position offset from the center of the reflector toward the first end in the direction in which the axis extends. The center of gravity of the outer shape of the second support portion is located at a position offset from the center of the reflector toward the second end in the direction in which the axis extends. The mirror unit according to claim 1.

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