CN216848344U - Head-up display - Google Patents

Abstract

The utility model provides a head-up display capable of concealing a hole into which a rotating shaft of a rotatable mirror is inserted. A head-up display that reflects a virtual image by projecting display light on a reflection-transmitting member includes a display portion that emits the display light, and a reflection portion that reflects the display light and is capable of passing through a predetermined rotation axis as the center rotating to adjust the direction in which the display light is reflected; and a bearing portion having a bearing hole that defines the rotation axis.

Description

HUD

technical field

The utility model relates to a head-up display.

Background technique

As a conventional head-up display, as shown in Patent Document 1, a configuration in which the angle of the concave mirror 41 is adjusted using a lead screw 61c is disclosed. Specifically, the protrusions 65h and 65i of the position adjustment unit 43 come into point contact with the holding member 42 of the concave mirror 41, respectively, and the drive member 61a is driven, whereby the concave mirror 41 rotates.

On the other hand, as shown in Patent Document 2, a structure for improving the slidability of the reflection unit 5 rotatable around a predetermined rotation shaft 521 by using a ball bearing 54 is disclosed.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2009-73461

Patent Document 2: Japanese Patent Laid-Open No. 2017-215364

In a head-up display in which such a concave mirror is provided so as to be rotatable about the rotation axis, when the inside is observed from the opening, there is a possibility that the hole into which the rotation axis is inserted can be visually recognized. The inability to visually recognize the rotation axis is due to the complicated structure of the hole, which can cause stray light, or is not ideal in appearance.

Utility model content

Therefore, the objective of this invention is to provide the head-up display which can hide the hole part into which the rotation shaft of the rotatable reflection part is inserted with a simple structure by paying attention to the above-mentioned actual situation.

In order to achieve the above object, the head-up display according to the present invention is a head-up display that reflects a virtual image by projecting display light on a reflection and transmission member, and includes:

a display part, the display part emits the display light;

a reflection part that reflects the display light and is capable of adjusting the direction in which the display light is reflected by being rotated around a predetermined rotation axis; and

a bearing portion having a bearing hole defining the rotating shaft,

The reflection part hides the bearing hole by having a protruding part protruding in the direction of the reflection surface.

In another aspect, the head-up display according to the present invention is a head-up display that reflects a virtual image by projecting display light on a reflection-transmitting member, and includes:

a display part, the display part emits the display light;

a reflection part that reflects the display light and is capable of adjusting the direction in which the display light is reflected by being rotated around a predetermined rotation axis; and

a bearing portion having a bearing hole defining the rotating shaft,

The bearing portion conceals the bearing hole by having a protruding portion protruding from the bearing hole in the direction of the reflection portion.

Description of drawings

FIG. 1 : is a figure which shows the case where the head-up display 1 of this invention is mounted in the vehicle C. FIG.

FIG. 2 is a diagram showing the appearance of the head-up display 1 .

FIG. 3 is a diagram showing an assembled state of the reflection part 30 , the bearing part 40 , and the bearing 50 .

FIG. 4 is a diagram showing the bracket 32 .

FIG. 5 is a diagram showing the bearing portion 40 .

FIG. 6 is a view showing the bearing portion 40 in a state in which the bearing 50 is press-fitted.

FIG. 7 is a view showing a cross section of the head-up display 1 on a plane including the rotation axis A and along the direction U. As shown in FIG.

FIG. 8 is a view showing the state of the view from a viewing angle toward the vicinity of the bearing hole 51 through the window portion 111 .

Symbol Description

1 HUD

11 Upper shell

110 Window

12 Lower case

20 Display

30 Reflector

31 Mirrors

32 brackets

331 Receiving Department

332 axes

34 Protrusions

35 Adhesive surface

36 Bracket rod

40 Bearings

41 Press-fit hole

42 Protrusions

491 Dowel pins

492 Locating hole

493 Knob

50 Ball bearing

51 Inner surface (bearing hole)

52 outer surface

C vehicle

Li display light

A Rotation axis

WS windshield (reflecting part)

EP eye point

Detailed ways

Hereinafter, the head-up display (HUD) 1 of the present invention will be exemplified as an embodiment and a modification to be mounted on the vehicle C, and will be described in the following order using the drawings. In addition, the directions F, B, L, R, U, D shown in all the drawings correspond to the front, rear, left, right, up, and down directions in the vehicle C, respectively. In addition, the left-right direction may be referred to as the direction X, the vertical direction may be referred to as the direction Y, and the front-rear direction may be referred to as the direction Z. In addition, for convenience of description, a part of the reference numerals that should be attached to the components shown in the drawings are omitted.

[First Embodiment]

[Variation]

[Effect example]

[First Embodiment]

<1-1. Explanation of structure>

As shown in FIGS. 1 and 2 , the HUD 1 of the present invention can be assembled under the windshield WS provided in the vehicle C.

The HUD 1 reflects the virtual image V by projecting the display light Li indicating vehicle information on the windshield WS (transmissive reflection member) formed in a free curved surface shape inclined so that the front end of the vehicle is lowered. The HUD 1 emits the display light Li toward the rear of the vehicle and obliquely upward. The display light Li emitted by the HUD1 is reflected by the windshield WS. A user (eg, a passenger of the vehicle C) who visually recognizes the display light Li reflected by the windshield WS at the viewpoint EP can visually recognize the reflected virtual image V as a display image floating on the back side of the windshield WS.

The virtual image V displays vehicle information such as speed and engine speed, route guidance display such as road sections, maps, blind spot monitor, warning display such as speed limit exceeding warning, etc., which are necessary to draw the attention of passengers (users, users) higher information. Thereby, a driving environment that reduces the need for viewpoint movement and focus adjustment of the eyes is provided. The virtual image V includes, in addition to characters and icons representing these pieces of information, a background portion, which has a rectangular shape, for example, when viewed from the passenger's side.

In addition, HUD1 roughly has two modes. One is a display mode in which the display light Li is projected on the windshield WS through the HUD 1 as shown in FIG. 1 , and the virtual image V can be visually recognized from the viewpoint EP. The other is the stop mode (parking mode) in which the HUD 1 does not project the display light Li on the windshield WS and the virtual image V cannot be visually recognized from the viewpoint EP. The HUD 1 of the parking mode in which the display light Li is not projected onto the windshield WS is in a position where the external light (mainly sunlight) that enters the HUD 1 from the direction of the windshield WS does not enter the display light Li based on the principle of retrograde light rays. The position of the reflection in the direction (the direction in which the display part optically exists). As a result, when the HUD 1 considered to be in the parked state of the vehicle C is in the parking mode, the display unit is prevented from being irradiated with external light and becoming a high temperature state.

In order to switch between these modes, the HUD 1 rotates the reflector 30 according to the configuration described later.

In the HUD 1 in the display mode, in order to adjust the height of the viewpoint EP at which the virtual image V can be visually recognized, the optical path of the display light Li can be changed by the configuration described later. In the present invention, as shown in the drawings, three types of short display light Ls, center display light Lc, and high display light Lt can be changed. Short display light Ls In the display mode, the HUD 1 projects the display light Li to the lower part of the windshield WS, and the virtual image V is reflected. In the high display light Lt, the HUD1 projects the display light Li to the upper part of the windshield WS, and the virtual image V is reflected. In the center display light Lc, a virtual image V is reflected by passing between the above-mentioned two display light paths.

The HUD 1 includes a control unit, an upper case 11 , a lower case 12 , a display unit 20 , a reflection unit 30 , and a bearing unit 40 .

A microcomputer can be applied to the control unit, and the microcomputer is provided with a storage unit such as a ROM, RAM, etc., not shown, for storing a predetermined program, various data, and a storage area at the time of calculation, and performing calculation processing according to the predetermined program CPU; and input and output interfaces, etc. The control unit is electrically connected to the display unit 20 , the power unit, and electronic equipment outside the HUD 1 . The control unit generates an image displayed on the display unit 20 based on vehicle information received from an in-vehicle device outside the HUD 1 , or controls the display of the display unit 20 , or controls the luminous intensity of the display unit 20 , or controls the rotation of the reflection unit 30 .

The upper case 11 and the lower case 12 are boxes to which the components included in the HUD 1 are fixed by known means such as bonding, fitting, and screwing. For example, the display unit 20 , the control unit (not shown), and the bearing unit 40 are fixed to the lower case 12 . In addition, the upper case 11 is a lid-shaped box provided so as to cover the lower case 12 from above, and has a window portion 111 in the center through which the display light Li passes. The window portion 111 may be closed with a transparent hard synthetic resin (acrylic resin, polyether resin, etc.). The user of the vehicle C can visually recognize the inside of the HUD 1 only through the window portion 111 .

The display unit 20 is a member that emits display light Li. In the present invention, it is emitted toward the direction F. As a member that emits the display light Li, for example, a structure using a TFT liquid crystal module, a structure using an organic EL, a projector using a DMD (Digital Micro-mirror Device), and the like can be applied. In a configuration using a TFT liquid crystal module, for example, the display unit 20 is a configuration in which a backlight unit and a liquid crystal display element connected to the control unit, respectively, are provided in a fixed state, and the liquid crystal display element that displays information under the control of the control unit is removed from the The display light Li is emitted by controlling the irradiation of illumination light from the backlight unit that is turned on and off by the control of the control unit. However, other than the illustrated case, as long as it is a structure capable of emitting display light, it goes without saying that the effect of the structure of the present invention can be exhibited.

As shown in FIG. 3 , the reflection part 30 is provided with a reflection mirror 31 and a bracket 32 .

The mirror 31 reflects the display light Li. For example, the surface of the mirror 31 that reflects the display light Li has a concave free-form surface shape, and a mirror surface is formed by methods such as vapor deposition and sputtering. The mirror 31 reflects the display light Li while amplifying it. The reflection mirror 31 can be made of hard synthetic resin or inorganic glass as a base material. In addition, it is preferable that the reflection surface 31a has a shape which cancels the deformation|transformation of the virtual image V which is supposed to generate|occur|produce in the windshield WS by the shape of a free-form surface.

As shown in FIG. 4 , the bracket 32 is a holding member for fixing the mirror 31 by known means such as adhesion and screwing. In addition, the holder 32 holds the mirror 31 rotatably about the rotation axis A as a center. As the material of the bracket 32, hard metals such as magnesium and iron, and hard synthetic resins such as ABS resin can be used.

The bracket 32 is provided with a receiving portion 331 , a shaft 332 , a protruding portion 34 , an adhesive surface 35 , and a bracket rod 36 .

The receiving portion 331 is a fitting hole into which the shaft 332 is inserted. The shaft 332 is preferably made of, for example, a material similar to a bearing or a bearing portion, and in this embodiment, stainless steel is used, for example. Generally, a material with high rigidity such as stainless steel is used for the bearing to be described later. On the other hand, since the deformation of the holder 32 due to its own weight induces the deformation of the virtual image V, a material having light weight in addition to rigidity is preferable. Therefore, the difference in material between the holder 32 and the bearing (bearing portion) may cause a difference in physical properties such as a linear expansion coefficient, and the like, thereby reducing the rotational capability. Therefore, the shaft 332 at the contact portion of the bracket 32 and the bearing preferably does not use the above-mentioned material (magnesium, synthetic resin) as the main material of the bracket 32, but uses a material similar to the bearing and the bearing portion.

The protruding portion 34 is a wall portion provided to protrude toward the reflection portion 30 . The bearing hole 51 is provided at a position separated from the mirror 31 in the direction X. As shown in FIG. The protruding portion 34 is protrudingly provided so as to hide the bearing hole 51 . The protruding portion 34 preferably has a plate shape along the direction of the plane orthogonal to the rotation axis A at a position not covering the mirror 31 . According to this shape, enlargement of the HUD can be prevented, and the bearing hole can be effectively hidden.

The adhesive surface 35 fixes the mirror 31 to the bracket 32 . Various fixing means, such as a double-sided tape and an adhesive agent, can be applied to the adhesive surface 35 .

The bracket rod 36 is an arm piece portion provided on the bracket 32 . The support rod 36 can rotate the entire reflector 30 around the rotation axis A by being pressed by a power unit (not shown). For example, a configuration using a lead screw can be applied to the power unit. Specifically, it is configured to include a drive portion such as a motor that rotates the rotating shaft in response to an input signal, a screw shaft that rotates in response to the rotation, an annular nut portion that is screwed to the screw shaft, and a guide portion that suppresses rotation of the nut portion, The power transmission part described later is fixed to the nut. The nut portion whose rotation is restrained by the guided portion can move linearly along the axial direction of the threaded shaft rotated by the driven portion. The position of the support rod is displaced based on the linear motion, and the reflection portion 30 is rotated. However, the power unit only needs to be a power unit that generates a torque sufficient to rotate the reflection unit 30, and may be a configuration using a motor, a transmission gear, a worm wheel, a rack and pinion, or the like.

In the present embodiment, the embodiment in which the reflection unit 30 is constituted by the reflection mirror 31 and the holder 32 is shown. According to this configuration, the manufacturing tolerance caused by the provision of the protruding portion 34 can be limited within the holder, and the possibility of the virtual image V being deformed can be reduced.

On the other hand, the protruding portion, the shaft, and the support rod may be provided integrally with the reflector. In this case, the HUD can be further miniaturized, or the manufacturing cost such as assembly can be reduced by reducing the number of components.

As shown in FIGS. 6 and 7 , the bearing portion 40 includes a press-fit hole 41 , a protruding portion 42 , a positioning pin 491 , a positioning hole 492 , a knob 493 , and a bearing 50 .

The bearing portion 40 is an attachment for fixing the bearing 50 to the lower case 12 . The outer surface 52 of the bearing 50 has a hole (press-fit hole 41 ) about the size of the outer surface 52 , and the bearing 50 is press-fitted into the hole. Therefore, it is preferable that the bearing part 40 is a material (hard metal, such as stainless steel, etc., hard synthetic resin, such as ABS) which has rigidity of the degree of positioning and pressure resistance.

The protruding portion 42 has a protruding shape to such an extent as to hide the inner surface 51 of the bearing 50 , which is a portion of the bearing hole. Especially when the protrusion 42 has a large and similar shape with respect to the upper half of the bearing hole 51, it can be effectively hidden. The meaning of concealment described in the present invention means that it is covered so that it cannot be visually recognized by a user in a state assembled as the HUD 1 or in a state assembled in a vehicle. Thereby, by hiding the structurally complicated part like the bearing hole 51, it is possible to have a simple appearance. In addition, in the structure of this embodiment using the bearing 50, the bearing 50 is used. Since it can be seen from the outside of the HUD that the bearing 50 that uses a lot of glossy stainless steel is particularly likely to cause stray light, so the bearing hole 51 is hidden by the protrusion and the bearing 50 is also hidden, which has a special effect.

In addition, the protruding portion 42 may have a shape that is symmetrical with respect to the plane including the rotation axis A and orthogonal to the direction Z. As shown in FIG. According to this configuration, if a common bearing portion is used for the left and right bearing portions 40 , when the other bearing portion is used at a position rotated 180 degrees in the horizontal direction with respect to the one bearing portion, it can be visually recognized from above. The shape of the left and right protruding parts 42 is symmetrical, so the appearance can be simplified.

The positioning pins 491 and the positioning holes 492 are fitted into the holes and pins which are oriented corresponding to the lower case 12 and the upper case 11 , thereby determining the position of the bearing portion 40 . In addition, these positioning units are preferably provided at positions symmetrical with respect to a plane including the rotation axis A and along the direction Y (direction UD). According to this configuration, when the vehicle C has the right-hand steering wheel specification and the left-hand steering wheel specification, the bearing portion 40 in each specification can be easily turned.

The knob 493 is a protrusion that the operator can hold when assembling the HUD. For example, when the reflection part 30 and the bearing part 40 (including the bearing 50 ) are in the assembled state, the state shown in FIG. 3 is obtained. Since there are no knobs 493 on the mirror 31 and the bracket 32, the operator can perform the assembling operation without deforming the mirror 31 or contacting the mirror surface and contaminating the mirror surface.

The bearing 50 is a sliding bearing for improving the slidability when the reflection part 30 is rotated. For example, in this embodiment, the bearing 50 is a ball bearing.

By making the diameter of the inner surface 51 substantially match the outer diameter of the shaft 332 , the shaft 332 can be press-fitted into the inner surface 51 . The fact that the shaft 332 that defines the rotation axis of the reflecting portion 30 is pressed into the inner surface 51 means that the inner surface 51 is a bearing hole.

By making the diameter of the outer surface 52 substantially match the inner diameter of the press-fit hole 41 , the bearing 50 can be press-fitted into the press-fit hole 41 . FIG. 6 shows the bearing portion 40 in a state in which the bearing 50 is press-fitted.

FIG. 7 is a diagram showing a cross-section of a main part of the head-up display 1 on a plane including the rotation axis A and along the direction U. As shown in FIG. The positional relationship of the upper case 11 , the lower case 12 , the reflection part 30 , and the bearing part 40 is shown. In this state, the reflector 30 rotates around the rotation axis A under the control of the control unit.

FIG. 8 is a diagram illustrating a situation in a viewing angle toward the vicinity of the bearing hole 51 via the window portion 111 . Due to the protruding portion 34 and the protruding portion 42, it can be confirmed that the bearing hole 51 cannot be visually recognized from this viewing angle. Further, the inventors have also considered a structure in which the bearing hole 51 is hidden by projecting the wall portion of the site shown in Patent Document 1 from the upper case 51 . However, the upper case 11 and the bearing hole 51 are often provided at positions separated from the head-up display, and in this positional relationship, when the protrusion for hiding the bearing hole 51 is provided in the upper case 11, the wall thickness becomes thinner and the molding becomes smaller. difficult. Therefore, as in the structure of the present invention, the bearing hole 51 is hidden by a member close to the bearing hole 51 such as the bearing portion 40 and the reflector 30, and there is a special effect that the exposure of the bearing hole 51 can be prevented with a very simple structure. .

In addition, the head-up display of the present invention has been described by taking the configuration of the above-mentioned embodiment as an example, but the present invention is not limited to this, and it goes without saying that various improvements can be made in other configurations without departing from the gist of the present invention. and displayed changes.

For example, although the structure using the bearing 50 is illustrated in this invention, this can also be excluded. Instead, it is sufficient to use the press-fit hole 41 as a bearing hole by reducing the inner diameter of the press-fit hole 41 of the bearing portion 40 to about the outer diameter of the shaft 332 . According to this structure, if the protrusion part is provided in the shape which protrudes so as to hide the bearing hole, the bearing hole can be hidden, and the external appearance can be brought into a favorable state.

In addition, in the first embodiment, the configuration using the bearing portion 40 was exemplified. However, the bearing portion 40 may be excluded, and the bearing 50 may be directly press-fitted into the lower case 12 so that the bearing portion 50 alone may be used as the bearing portion.

In addition, in the first embodiment, the description has been centered on one of the directions L in the two bearing portions 40 . Moreover, the structure in which the protrusion part 34 is provided in the holder 32 is illustrated. This is because, in order to facilitate the understanding of the description, the description will focus on the bearing hole 51 located on one of the directions L among the bearing holes that should exist. Therefore, when it is desired to hide the bearing hole located on the other side of the direction R, it is only necessary to use at least one protrusion in the direction R to hide it. In addition, the bearing hole may be substantially hidden by combining a plurality of protrusions.

In addition, in the first embodiment, the configuration in which the upper case 11 includes the window portion 111 was exemplified. However, the window portion may be a frame with a transparent center such that the display light Li passes through. For example, a cover glass in which black printing is provided on the outer edge of a synthetic resin base material such as polycarbonate and PMMA may be applied as the window portion 111 .

[Effect example]

First, the head-up display of the present invention is a head-up display 1 that reflects the virtual image V by projecting the display light Li on the windshield WS, and has:

the display part 20, which emits the display light Li;

the reflection part 30, which reflects the display light Li and can adjust the direction of the reflected display light Li by being rotated around a predetermined rotation axis A; and

The bearing portion 40 has a bearing hole 51 that defines the rotation axis A,

The reflector 30 has a protrusion protruding in the direction of the reflecting surface, thereby hiding the bearing hole.

According to this structure, the head-up display can hide the hole part into which the rotation shaft (shaft) of the rotatable mirror is inserted with a simple structure.

Second, in the head-up display of the present invention,

The reflection part 30 is provided with:

a mirror 31, which reflects the display light Li; and

The holder 32 holds the mirror 31 and has a shaft 332 that can be rotated around the rotation axis A,

The bracket 32 has a plate-shaped protrusion 34 having a surface shape parallel to a surface orthogonal to the rotation axis A. As shown in FIG.

Third, the head-up display of the present invention is a head-up display 1 that reflects the virtual image V by projecting the display light Li on the windshield WS, and includes:

the display part 20, which emits the display light Li;

the reflection part 30, which reflects the display light Li and can adjust the direction of the reflected display light Li by being rotated around a predetermined rotation axis A; and

The bearing portion 40 has a bearing hole 51 that defines the rotation axis A,

The bearing portion 40 conceals the bearing hole 51 by having the protruding portion 42 protruding from the bearing hole in the direction in which the reflection portion 30 is located.

Fourth, the head-up display of the present utility model also has:

The upper case 11 has a window portion 111 for the display light Li to pass through,

The bearing hole 51 is formed by the inner surface 51 of the bearing 50,

The protruding portion 42 hides the inner surface 51 to such an extent that the inner ring of the bearing 50 cannot be visually recognized from the window portion 111 .

Claims (4)

1. A head-up display, characterized in that, the head-up display reflects a virtual image by projecting display light to a reflection and transmission member, and has: a display part, the display part emits the display light; a reflection part that reflects the display light and is capable of adjusting the direction in which the display light is reflected by being rotated around a predetermined rotation axis; and a bearing portion having a bearing hole defining the rotating shaft, The reflector has a protruding portion protruding in the direction of the reflecting surface, thereby hiding the bearing hole. 2. The head-up display of claim 1, wherein The reflection part is provided with: a mirror that reflects the display light; and a bracket that holds the mirror and has an axis rotatable about the rotation axis, The holder has the protruding portion in the shape of a plate having a surface shape parallel to a surface orthogonal to the rotation axis. 3. A head-up display, characterized in that the head-up display reflects a virtual image by projecting display light onto a reflection and transmission member, and has: a display part, the display part emits the display light; a reflection part that reflects the display light and is capable of adjusting the direction in which the display light is reflected by being rotated around a predetermined rotation axis; and a bearing portion having a bearing hole defining the rotating shaft, The bearing portion hides the bearing hole by having a protruding portion protruding from the bearing hole in the direction in which the reflection portion is located. 4. The head-up display according to any one of claims 1 to 3, wherein It also includes a box having a window through which the display light passes, The bearing hole is formed by the inner surface of the bearing, The protruding portion hides the bearing hole to such an extent that the inner ring of the bearing cannot be visually recognized from the window portion.

Images