CN216848344U

CN216848344U - Head-up display

Info

Publication number: CN216848344U
Application number: CN202090000840.7U
Authority: CN
Inventors: 荻野恭平
Original assignee: Nippon Seiki Co Ltd
Current assignee: Nippon Seiki Co Ltd
Priority date: 2019-09-26
Filing date: 2020-09-08
Publication date: 2022-06-28
Anticipated expiration: 2030-09-08
Also published as: WO2021059953A1; JP7367765B2; JPWO2021059953A1

Abstract

The utility model provides a head-up display that can hide the rotation axis male hole portion that supplies can rotatory speculum. A head-up display for projecting display light onto a transflective member to display a virtual image, the head-up display comprising: a display unit that emits the display light; a reflection unit that reflects the display light and can adjust a direction in which the display light is reflected by rotating around a predetermined rotation axis; and a bearing portion having a bearing hole defining the rotation shaft.

Description

Head-up display

Technical Field

The utility model relates to a head-up display.

Background

As a conventional head-up display, a configuration is disclosed in which an angle of a concave mirror 41 is adjusted by using a lead screw (lead screw)61c as shown in patent document 1. Specifically, the protrusions 65h and 65i of the position adjustment unit 43 are in point contact with the holding member 42 of the concave mirror 41, and the concave mirror 41 is rotated by driving the driving member 61 a.

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

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2009-73461

Patent document 2: japanese patent laid-open publication No. 2017-215364

In the head-up display in which such a concave mirror is provided so as to be rotatable about the rotation axis, when the inside is viewed from the opening, there is a possibility that the hole into which the rotation axis is inserted can be visually recognized. The reason why the rotation axis cannot be visually recognized is that the hole has a complicated structure, which causes stray light or is not preferable in appearance.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a head-up display in which a hole into which a rotary shaft of a rotatable reflection unit is inserted can be hidden with a simple structure.

In order to achieve the above object, a head-up display according to the present invention is a head-up display that projects display light onto a transflective member to reflect a virtual image, and includes:

a display unit that emits the display light;

a reflection unit that reflects the display light and can adjust a direction in which the display light is reflected by rotating around a predetermined rotation axis; and

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

the reflecting portion has a protruding portion protruding in the direction of the reflecting surface, thereby hiding the bearing hole.

In another aspect, a head-up display according to the present invention is a head-up display that projects display light onto a transflective member to reflect a virtual image, the head-up display including:

a display unit that emits the display light;

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

the bearing portion has a protruding portion protruding from the bearing hole in the direction of the reflecting portion, thereby hiding the bearing hole.

Drawings

Fig. 1 is a diagram showing a head-up display 1 according to the present invention mounted on a vehicle C.

Fig. 2 is a diagram showing an external appearance of the head-up display 1.

Fig. 3 is a view showing an assembled state of reflection unit 30, bearing unit 40, and bearing 50.

Fig. 4 is a view showing the holder 32.

Fig. 5 is a view showing the bearing portion 40.

Fig. 6 is a view showing the bearing portion 40 in a state where 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.

Fig. 8 is a view showing a view angle toward the vicinity of the bearing hole 51 through the window portion 111.

Description of the symbols

1 head-up display

11 upper shell

110 window part

12 lower shell

20 display part

30 reflection part

31 mirror

32 holder

331 receiver

332 axis

34 projection

35 adhesive surface

36 support rod

40 bearing part

41 press-fit hole

42 projection

491 locating pin

492 positioning holes

493 knob

50 ball bearing

51 inner surface (bearing hole)

52 outer surface

C vehicle

Li display light

A rotating shaft

WS windshield (reflection and transmission parts)

EP viewpoint (eye point)

Detailed Description

Hereinafter, the head-up display (HUD)1 according to the present invention will be described in the following order by taking an embodiment and a modification example mounted on the vehicle C as an example, and using the drawings. Further, 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. The left-right direction is sometimes referred to as a direction X, the up-down direction is sometimes referred to as a direction Y, and the front-back direction is sometimes referred to as a direction Z. For convenience of explanation, reference numerals to be assigned to components illustrated in the drawings are omitted.

[ first embodiment ]

[ modified examples ]

[ Effect example ]

[ first embodiment ]

<1-1 > description of the Structure >

As shown in fig. 1 and 2, the HUD1 of the present invention can be assembled below the windshield WS provided in the vehicle C.

The HUD1 projects display light Li indicating vehicle information onto a windshield WS (reflection/transmission member) formed in a free-form surface shape inclined such that one end on the front side of the vehicle is lowered, thereby reflecting a virtual image V. The HUD1 emits the display light Li obliquely upward toward the vehicle rear direction. The display light Li emitted by the HUD1 is reflected by the windshield WS. A user (for example, 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 virtual image V as a display image floating on the rear side of the windshield WS.

The virtual image V displays vehicle information such as speed and engine speed, route guidance display such as a link and a map, a blind spot monitor, warning display such as a speed limit excess warning, and other information that is highly necessary to call attention to passengers (users ). Thereby, a driving environment is provided that reduces the need for viewpoint movement and focal length adjustment of the eyes. The virtual image V includes, in addition to characters and icons representing these pieces of information, a background portion, which has, for example, a rectangular shape when viewed from above the passenger.

In addition, HUD1 generally has two modes. One is a display mode in which the virtual image V can be visually recognized from the viewpoint EP by projecting the display light Li onto the windshield WS through the HUD1 as shown in fig. 1. The other is a stop mode (parking mode) in which the HUD1 does not project the display light Li on the windshield WS and the virtual image V is not visually recognized from the viewpoint EP. The HUD1 in the parking mode, which does not project the display light Li onto the windshield WS, is located at a position where external light (mainly sunlight) entering the HUD1 from the direction of the windshield WS is not reflected in the direction in which the display light Li enters (the direction in which the display unit optically exists), based on the principle of backward travel of light rays. Thus, when the HUD1, which is considered to be in a state where the vehicle C is parked, is in the parking mode, the display unit is prevented from being exposed to external light and from being in a high-temperature state.

The HUD1 rotates the reflection unit 30 according to the configuration described later in order to switch the modes.

In the HUD1 in the display mode, the optical path of the display light Li can be changed by a configuration described later in order to adjust the height of the viewpoint EP at which the virtual image V can be visually recognized. The present invention can be changed to three types of the shorter display light Ls, the central display light Lc, and the higher display light Lt, as shown in the drawings. In the display mode, the HUD1 projects the display light Li toward the lower portion of the windshield WS to project the virtual image V. In the higher display light Lt, the HUD1 projects the display light Li toward the upper portion of the windshield WS, reflecting the virtual image V. In the center display light Lc, a virtual image V is reflected between the two display light paths.

The HUD1 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.

The control section can employ a microcomputer provided with: a storage unit such as a ROM or a RAM, not shown, for defining a storage area for storing a program and various data and calculating; a CPU for performing arithmetic processing in accordance with the predetermined program; and input/output interfaces, etc. The control unit is electrically connected to the display unit 20, the power unit, and an electronic device outside the HUD 1. The control unit generates an image to be displayed on the display unit 20, controls the display on the display unit 20, controls the light emission intensity of the display unit 20, or controls the rotation of the reflection unit 30, based on vehicle information received from an in-vehicle device outside the HUD 1.

The upper case 11 and the lower case 12 are cases in which the components of the HUD1 are fixed by known means such as adhesion, fitting, or screw fixing. For example, the lower case 12 fixes the display unit 20, a control unit, not shown, and the bearing unit 40. The upper case 11 is a lid-shaped box provided to cover the lower case 12 from above, and has a window 111 in the center through which the display light Li passes. The window 111 may be sealed with a transparent hard synthetic resin (acrylic resin, polyether resin, or the like). The user of the vehicle C can visually recognize the inside of the HUD1 only through the window portion 111.

The display unit 20 emits display light Li. The utility model discloses in, the outgoing of orientation direction F. As a member for emitting 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), or the like can be applied. In the configuration using the TFT liquid crystal module, for example, the display unit 20 is configured such that a backlight unit and a liquid crystal display element, which are connected to the control unit, are provided in a fixed state, and the liquid crystal display element for displaying information under the control of the control unit is irradiated with illumination light emitted from the backlight unit whose on/off is controlled under the control of the control unit, thereby emitting display light Li. However, it is needless to say that the effects of the structure of the present invention can be exhibited as long as the structure can emit display light, other than the illustrated case.

As shown in fig. 3, the reflector 30 includes a reflector 31 and a holder 32.

The mirror 31 reflects the display light Li. The mirror 31 has a concave free-form surface on which the display light Li is reflected, and is formed into a mirror surface by a method such as vapor deposition or sputtering. The mirror 31 reflects while enlarging the display light Li. The reflecting mirror 31 can be formed by applying a hard synthetic resin or an inorganic glass to a base material. The reflecting surface 31a is preferably shaped to cancel out the distortion of the virtual image V supposed to occur in the windshield WS by the free-form surface shape.

As shown in fig. 4, the holder 32 is a holding member for fixing the mirror 31 by a known means such as adhesion or screw fixation. The holder 32 holds the mirror 31 to be rotatable about the rotation axis a. As the material of the holder 32, hard metal such as magnesium or iron, or hard synthetic resin such as ABS resin can be used.

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

The receiving portion 331 is a fitting hole into which the shaft 332 is inserted. The shaft 332 is preferably made of a material similar to a bearing or a bearing portion, for example, and stainless steel is used in the present embodiment, for example. The bearing described later is usually made of a material having high rigidity such as stainless steel. On the other hand, since the deformation of the virtual image V is induced by the own weight of the support 32, a material having both rigidity and lightweight is preferable. Therefore, the difference in material between the bracket 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 rotation capability. Therefore, it is preferable that the shaft 332 at the contact portion between the bracket 32 and the bearing be made of a material similar to the bearing or the bearing portion, instead of the above-described material (magnesium or synthetic resin) as the main material of the bracket 32.

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. The protruding portion 34 is provided so as to protrude to a degree of hiding the bearing hole 51. The protruding portion 34 is preferably plate-shaped at a position not covering the mirror 31 and along a direction of a surface orthogonal to the rotation axis a. According to this shape, the HUD can be prevented from being enlarged and the bearing hole can be effectively hidden.

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

The bracket lever 36 is an arm piece portion provided to the bracket 32. The holder lever 36 is pressed by a power unit, not shown, and thereby can rotate the entire reflection unit 30 about the rotation axis a. The power unit can be configured using a lead screw, for example. Specifically, the power transmission unit is configured to include a driving unit such as a motor that rotates a rotary shaft in response to an input signal, a threaded shaft that rotates in response to the rotation, an annular nut unit that is screwed into the threaded shaft, and a guide unit that suppresses rotation of the nut unit, and is fixed to the nut. The nut portion, the rotation of which is suppressed by the guided portion, can perform linear motion along the axial direction of the threaded shaft, the rotation of which is suppressed by the driven portion. The position of the support rod is displaced based on the linear motion, and the reflection part 30 rotates. However, the power unit may be any power unit that generates a torque of such a degree that the reflection unit 30 can be rotated, and may be configured using a motor, a change gear, a worm wheel, a rack and pinion, or the like.

In the present embodiment, the reflection unit 30 is configured by the mirror 31 and the holder 32. According to this configuration, the manufacturing tolerance caused by providing the protruding portion 34 can be limited within the stent, and the possibility of deformation of the virtual image V can be reduced.

On the other hand, the projection, the shaft, and the holder bar may be provided integrally with the mirror. 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 fig. 6 and 7, the bearing portion 40 includes a press-fitting hole 41, a projection 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 bearing 50 is press-fitted into a hole (press-fitting hole 41) having a size corresponding to the left and right of the outer surface 52 of the bearing 50. Therefore, the bearing portion 40 is preferably made of a material (hard metal such as stainless steel, hard synthetic resin such as ABS) having rigidity to such an extent that positioning and pressure resistance are possible.

The protruding portion 42 is in a protruding shape to such an extent that an inner surface 51 of the bearing 50, which is a portion of the bearing hole, is hidden. The projection 42 can be effectively hidden, particularly, when it is large and similarly shaped with respect to the upper half of the bearing hole 51. The term "hidden" as used herein means covering the HUD1 in a state of being assembled or mounted in a vehicle to such an extent that the user cannot visually recognize the HUD. This allows the bearing hole 51 to be hidden at a structurally complicated portion, thereby making the appearance simple. In the structure of the present embodiment using the bearing 50, the bearing 50 is used. Since the bearing 50 using a large amount of glossy stainless steel can be seen from the outside of the HUD, the bearing 50 is particularly likely to be a cause of stray light, and therefore hiding the bearing hole 51 by the protruding portion also brings about a special effect of hiding the bearing 50.

The protruding portion 42 may have a shape that is plane-symmetric with respect to a plane that includes the rotation axis a and is orthogonal to the direction Z. According to this configuration, if a common bearing portion is used for the left and right bearing portions 40, and the other bearing portion is used at a position rotated by 180 degrees in the horizontal direction with respect to the one bearing portion, the left and right protrusions 42 are formed in a left-right symmetrical shape, which can be seen from above, and therefore, the appearance can be simplified.

Positioning pins 491 and positioning holes 492 are fitted into holes and pins facing lower housing 12 and upper housing 11, thereby determining the position of bearing portion 40. It is preferable that these positioning means are provided at positions symmetrical with respect to a plane including the rotation axis a and extending along the direction Y (direction UD). According to this configuration, when the vehicle C has the right-hand-wheel specification and the left-hand-wheel specification, the bearing portion 40 of each specification can be easily used.

Knob 493 is a protrusion that an operator can hold when assembling the HUD. For example, when the reflecting portion 30 and the bearing portion 40 (including the bearing 50) are assembled, the state is as shown in fig. 3. By not providing the knob 493 on the reflector 31 and the holder 32, the operator can perform the assembling operation without deforming the reflector 31 and without touching the mirror surface to cause contamination.

The bearing 50 is a slide bearing for improving the slidability of the reflection unit 30 when rotating. For example, in the present embodiment, the bearing 50 is a ball bearing.

By making the diameter of the inner surface 51 substantially equal to the outer diameter of the shaft 332, the shaft 332 can be pressed into the inner surface 51. The shaft 332 defining the rotation axis of the reflection unit 30 is pressed into the inner surface 51, meaning that the inner surface 51 is a bearing hole.

By making the diameter of the outer surface 52 substantially equal to the inner diameter of the press-fitting hole 41, the bearing 50 can be press-fitted into the press-fitting hole 41. Fig. 6 shows the bearing portion 40 in a state where the bearing 50 is press-fitted.

Fig. 7 is a view showing a main portion cross section of the head-up display 1 on a plane including the rotation axis a and along the direction U. The positional relationship of the upper case 11, the lower case 12, the reflection portion 30, and the bearing portion 40 is shown. In this state, the reflection unit 30 rotates about the rotation axis a under the control of the control unit.

Fig. 8 is a view illustrating a case in a viewing angle toward the vicinity of the bearing hole 51 via the window portion 111. The bearing hole 51 can be confirmed to be invisible from the view angle due to the protruding portion 34 and the protruding portion 42. The inventors also consider a structure in which the bearing hole 51 is hidden by projecting a wall portion of a portion shown in patent document 1 from the upper case 51. However, the upper case 11 and the bearing hole 51 are often provided at separate positions in the head-up display, and in this positional relationship, when a projection for hiding the bearing hole 51 is provided in the upper case 11, the thickness becomes thin, and molding becomes difficult. Therefore, as in the structure of the present invention, the shaft hole 51 is concealed by the member close to the shaft hole 51 such as the bearing portion 40 and the reflection portion 30, and the shaft hole 51 can be prevented from being exposed with a very simple structure.

The head-up display of the present invention has been described by taking the configuration of the above embodiment as an example, but the present invention is not limited to this, and various improvements and changes in display can be made in other configurations without departing from the scope of the present invention.

For example, although the present invention exemplifies a structure using the bearing 50, the structure may be excluded. Instead, the press-fitting hole 41 of the bearing 40 may be used as a bearing hole by reducing the inner diameter of the press-fitting hole 41 to about the outer diameter of the shaft 332. According to this configuration, the bearing hole can be concealed and the appearance can be improved if the protruding portion is provided in a shape protruding to such an extent as to conceal the bearing hole.

In the first embodiment, the structure using the bearing portion 40 is exemplified. However, the bearing portion 40 may be eliminated, and the bearing 50 may be directly press-fitted into the lower case 12, so that the bearing 50 alone may be used as the bearing portion.

In the first embodiment, the description has been given centering on one of the two bearing portions 40 in the direction L. The configuration in which the protruding portion 34 is provided in the holder 32 is exemplified. This is because, for ease of understanding of the description, the description will be given with a focus on the bearing hole 51 located in one of the two bearing holes in the direction L. Therefore, when it is desired to conceal the bearing hole located on the other side in the direction R, it is only necessary to conceal the bearing hole by using at least one projection in the direction R. Further, the bearing hole may be substantially hidden by combining a plurality of projections.

In the first embodiment, the upper case 11 is provided with the window 111. However, the window portion may be a frame having a transparent center through which the display light Li passes. For example, a cover glass having a black print provided on the outer edge of a base material of a synthetic resin such as polycarbonate or PMMA may be used as the window 111.

[ Effect example ]

First, the head-up display of the present invention is a head-up display 1 that projects display light Li onto a windshield WS to project a virtual image V, and includes:

a display unit 20 that emits display light Li;

a reflection unit 30 that reflects the display light Li and can adjust the direction of the reflected display light Li by rotating about a predetermined rotation axis a; and

a bearing portion 40 having a bearing hole 51 defining a rotation axis A,

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

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

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

the reflection unit 30 is provided with:

a mirror 31 that reflects the display light Li; and

a holder 32 holding the mirror 31 and having a shaft 332 rotatable about a rotation axis A,

the bracket 32 has a plate-like projection 34 having a surface parallel to a plane orthogonal to the rotation axis a.

Third, the head-up display of the present invention is a head-up display 1 that projects display light Li onto a windshield WS to project a virtual image V, and includes:

a display unit 20 that emits display light Li;

a bearing portion 40 having a bearing hole 51 defining a rotation axis A,

the bearing portion 40 has a protruding portion 42 protruding from the bearing hole in the direction of the reflection portion 30, thereby hiding the bearing hole 51.

Fourth, the utility model discloses a head-up display still possesses:

an upper case 11 having a window portion 111 through which display light Li passes,

the bearing bore 51 is formed by the inner surface 51 of the bearing 50,

the protrusion 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 111.

Claims

1. A head-up display that projects display light onto a transflective member to project a virtual image, the head-up display comprising:

a display unit that emits the display light;

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

2. Head-up display according to claim 1,

the reflection part is provided with:

a mirror reflecting the display light; and

a holder holding the mirror and having a shaft rotatable about the rotation axis,

the bracket has the plate-shaped protruding portion having a surface shape parallel to a plane orthogonal to the rotation axis.

3. A head-up display that projects display light onto a transflective member to project a virtual image, the head-up display comprising:

a display unit that emits the display light;

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

the bearing portion has a protruding portion protruding from the bearing hole in a direction in which the reflecting portion is located, thereby hiding the bearing hole.

4. Head-up display according to any one of claims 1 to 3,

further comprising a case having a window through which the display light passes,

the bearing bore is formed by an inner surface of the bearing,

the protrusion conceals the bearing hole to such an extent that the inner ring of the bearing cannot be visually recognized from the window portion.