JP7367765B2 - heads up display - Google Patents

Description

The present invention relates to a head-up display.

Conventionally, as a head-up display, a configuration has been disclosed in which the angle of a concave mirror (41) is adjusted using a lead screw (61c), as shown in Patent Document 1. Specifically, the protrusions (65h, 65i) of the position adjustment means (43) make point contact with the holding members (42) of the concave mirror (41), and the driving member (61a) drives the concave mirror (41). ) rotates.

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

JP2009-73461A Japanese Patent Application Publication No. 2017-215364

In such a head-up display in which a concave mirror is rotatably provided around a rotating shaft, there is a possibility that the hole into which the rotating shaft is inserted may be visible when looking into the display through the opening. If the axis of rotation is visible, because the hole structure is complex, it may cause stray light or be undesirable in terms of appearance.
SUMMARY OF THE INVENTION An object of the present invention, paying attention to the above-mentioned actual situation, is to provide a head-up display in which a hole into which a rotation shaft of a rotatable reflector is inserted can be hidden with a simple structure.

In order to achieve the above object, the head-up display according to the present invention includes:
A head-up display that projects a virtual image by projecting display light onto a reflective-transmissive member,
a display unit that emits the display light;
a reflecting part that reflects the display light and can adjust the direction in which the display light is reflected by rotating around a predetermined rotation axis;
a bearing portion having a bearing hole that defines the rotation axis;
comprising a casing having a window through which the display light passes ;
The bearing portion includes a main body portion forming the bearing hole, and a side surface portion facing the reflecting portion of the main body portion,
The bearing portion has a protruding portion formed on the side surface portion and protruding from the bearing hole in a direction in which the reflecting portion is located ,
The protruding portion is formed only on the window portion side of the periphery of the bearing hole,
The protruding portion hides the bearing hole to such an extent that the bearing hole cannot be visually recognized from the window portion .

FIG. 1 is a diagram showing a head-up display 1 of the present disclosure installed in a vehicle C. FIG. 1 is a diagram showing the appearance of a head-up display 1. FIG. FIG. 3 is a diagram showing a sub-assembly state of a reflecting section 30, a bearing section 40, and a bearing 50. FIG. 3 is a diagram showing a holder 32; FIG. 4 is a diagram showing a bearing section 40. FIG. FIG. 4 is a diagram showing the bearing portion 40 in a state in which a bearing 50 is press-fitted. FIG. 1 is a diagram showing a cross section of the head-up display 1 along a direction U including a rotation axis A. FIG. FIG. 4 is a view showing the view toward the vicinity of the bearing hole 51 through the window portion 111;

Hereinafter, a head-up display (HUD) 1 according to the present disclosure will be exemplified as an embodiment and a modified example mounted on a vehicle C, and will be described in the following order using the accompanying drawings. Note that the directions F, B, L, R, U, and D shown in all the drawings correspond to the front, rear, left, right, upper, and lower directions of the vehicle C, respectively. Further, the left-right direction is sometimes called a direction X, the up-down direction is sometimes called a direction Y, and the front-back direction is sometimes called a direction Z. In order to facilitate the explanation, some of the symbols that should be attached to the members shown in the drawings are omitted.

[First embodiment]
[Modified example]
[Effect example]

[First embodiment]
<1-1. Configuration explanation>
As shown in FIGS. 1 and 2, the HUD 1 of the present disclosure can be assembled below a windshield WS provided in a vehicle C.

The HUD 1 projects a virtual image V by projecting display light Li representing vehicle information onto a windshield WS (reflective/transmissive member) having a free-form surface shape inclined so that the front end of the vehicle is lowered. The HUD 1 emits display light Li toward the rear of the vehicle and diagonally upward. The display light Li emitted to the HUD 1 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 from the viewpoint EP can visually recognize the projected virtual image V as a display image floating behind the windshield WS.

The virtual image V contains vehicle information such as speed and engine speed, route guidance displays such as turn-by-turn and maps, warning displays such as blind spot monitors and speed limit warnings, etc., for the occupants (users). Information that requires a high level of alertness is displayed. This provides a driving environment in which the need for viewpoint movement and eye focal length adjustment is reduced. The virtual image V includes characters and icons indicating this information as well as a background portion, which has a rectangular shape, for example, when viewed from above from the passenger.

Further, the HUD 1 has two main modes. One is a display mode, as shown in FIG. 1, in which the HUD 1 projects display light Li onto the windshield WS, so that the virtual image V can be viewed from the viewpoint EP. The other mode is a rest mode (parking mode) in which the HUD 1 does not project the display light Li onto the windshield WS and the virtual image V cannot be viewed from the viewpoint EP. In the parking mode HUD 1 in which the display light Li is not projected onto the windshield WS, the display light Li is incident on external light (mainly sunlight) that enters the HUD 1 from the direction of the windshield WS based on the principle of backward propagation of light rays. This means that it is located at a position where there is no reflection in the direction (the direction in which the display section is optically present). Thereby, when the HUD 1 is in the parking mode when the vehicle C is considered to be in a stopped state, the display section is prevented from being illuminated by external light and becoming in a high temperature state.
In order to switch between these modes, the HUD 1 rotates the reflecting section 30 according to a configuration described below.

The HUD 1 in the display mode can change the optical path of the display light Li by a configuration described later in order to adjust the height of the viewpoint EP from which the virtual image V can be viewed. In the present disclosure, as shown in the drawings, the light can be changed to three types: Shorter display light Ls, center display light Lc, and Toler display light Lt. In the display mode, the shorter display light Ls projects the display light Li to a relatively lower part of the windshield WS, and displays the virtual image V. In the Torah display light Lt, the HUD 1 projects the display light Li onto a relatively upper portion of the windshield WS to project a virtual image V. The center display light Lc passes between the two display optical paths mentioned above and projects the virtual image V.

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

The control unit is provided with a storage unit such as a ROM or RAM (not shown) used as a storage area for storing predetermined programs and various data and during calculations, a CPU for performing calculation processing according to the predetermined program, and an input/output interface. Microcomputer can be applied. The control unit is electrically connected to the display unit 20, the power unit, and electronic equipment external to 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 illuminance of the display unit 20, based on vehicle information received from in-vehicle equipment external to the HUD 1, The rotation of the reflection section 30 is controlled.

The upper case 11 and the lower case 12 are casings in which members included in the HUD 1 are fixed by known means such as adhesion, fitting, and screw fixing. For example, the lower case 12 fixes the display section 20, a control section (not shown), and a bearing section 40. Moreover, the upper case 11 is a lid-shaped housing provided so as 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 portion 111 may be closed using a transparent hard synthetic resin (acrylic, polycarbonate, etc.). The user of vehicle C can view the inside of HUD 1 only through window 111 .

The display section 20 is a member that emits display light Li. In the present disclosure, the light is emitted in the direction F. As the member that emits the display light Li, for example, a configuration using a TFT liquid crystal module, a configuration using an organic EL, a projector using a DMD (Digital Micro-mirror Device), etc. can be applied. In a configuration using a TFT liquid crystal module, for example, the display unit 20 has a configuration in which a backlight unit and a liquid crystal display element each connected to a control unit are provided in a fixed state, and the liquid crystal display element displays information under the control of the control unit. emits display light Li by being illuminated by illumination light emitted from a backlight unit whose blinking is controlled by the control unit. However, it goes without saying that the effects of the configuration of the present disclosure can be achieved with configurations other than those exemplified as long as they can emit display light.

As shown in FIG. 3, the reflecting section 30 is provided with a reflecting mirror 31 and a holder 32. As shown in FIG.

The reflecting mirror 31 reflects the display light Li. For example, the surface of the reflecting mirror 31 that reflects the display light Li has a concave free-form surface shape, and the mirror surface is formed by a method such as vapor deposition or sputtering. The reflecting mirror 31 reflects the display light Li while magnifying it. The reflecting mirror 31 can be made of hard synthetic resin or inorganic glass as a base material. Further, it is desirable that the reflection surface 31a has a free-form surface shape that can cancel out distortion of the virtual image V that is assumed to occur in the windshield WS.

As shown in FIG. 4, the holder 32 is a holding member that fixes the reflecting mirror 31 by known means such as adhesion or screwing. Further, the holder 32 holds the reflecting mirror 31 so as to be rotatable about the rotation axis A. The material of the holder 32 can be hard metal such as magnesium or iron, or hard synthetic resin such as ABS resin.
The holder 32 includes a receiving portion 331, a shaft 332, a protruding portion 34, an adhesive surface 35, and a holder lever 36.

The receiving portion 331 is a fitting hole into which the shaft 332 is inserted. The shaft 332 is desirably made of a material similar to a bearing or a bearing portion, for example, and in this embodiment, stainless steel is used, for example. The bearings described below are usually made of a highly rigid material such as stainless steel. On the other hand, since distortion of the holder 32 due to its own weight induces distortion of the virtual image V, it is preferable to use a material that is not only rigid but also lightweight. Therefore, differences in the materials between the holder 32 and the bearing (bearing portion) may cause differences in physical properties such as coefficient of linear expansion, resulting in a decrease in rotational ability. Therefore, instead of using the above-mentioned materials (magnesium and synthetic resin), which are the main materials of the holder 32, the shaft 332, which is the contact point with the bearing of the holder 32, is made of a material similar to the bearing and the bearing part. It is desirable that

The protruding portion 34 is a wall portion provided to protrude from the reflecting portion 30 . The bearing hole 51 is provided at a position spaced apart from the reflecting mirror 31 in the direction X. The protrusion 34 is provided so as to protrude to the extent that it hides the bearing hole 51. It is desirable that the protruding portion 34 is in a plate shape in a position that does not cover the reflecting mirror 31 and extends in a direction perpendicular to the rotation axis A. According to this shape, it is possible to efficiently hide the bearing hole while preventing the HUD from becoming enlarged.

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

The holder lever 36 is an arm piece provided on the holder 32. The holder lever 36 can rotate the entire reflecting section 30 around the rotation axis A by being pushed by a power section (not shown). For example, a configuration using a lead screw can be applied to the power unit. Specifically, this includes a drive unit such as a motor that rotates a rotating shaft in accordance with an input signal, a screw shaft that rotates in response to the rotation, a ring-shaped nut that is screwed onto the screw shaft, and a guide that suppresses rotation of the nut. It has a structure in which a power transmission part, which will be described later, is fixed to a nut. The nut portion whose rotation is suppressed by the guide portion can perform linear motion along the axial direction of the screw shaft rotated by the drive portion. Based on this linear movement, the position of the holder lever is displaced and the reflecting section 30 is rotated. However, the power unit may be any power unit that generates a torque sufficient to rotate the reflection unit 30, and may be configured using a motor, a speed change gear, a worm gear, a rack and pinion, or the like.

In this embodiment, a mode is shown in which the reflecting section 30 is composed of a reflecting mirror 31 and a holder 32. According to this configuration, manufacturing tolerances due to the provision of the protrusion 34 can be kept within the holder, and the possibility that the virtual image V will be distorted can be reduced.
On the other hand, the protrusion, the shaft, and the holder lever may be provided integrally with the reflecting mirror. In this case, it is possible to further downsize the HUD, and by reducing the number of members, manufacturing costs such as assembly can be reduced.

As shown in FIGS. 6 and 7, the bearing section 40 includes a press-fit hole 41, a protrusion 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. It has a hole (press-fitting hole 41) about the size of the outer surface 52 of the bearing 50, and the bearing 50 is press-fitted therein. Therefore, it is desirable that the bearing portion 40 be made of a material (hard metal such as stainless steel, hard synthetic resin such as ABS) that is sufficiently rigid to withstand positioning and press-fitting.

The protrusion 42 has a shape that protrudes enough to hide the inner surface 51 of the bearing 50, which is a bearing hole. In particular, the protrusion 42 can be effectively hidden if it is large and has a similar shape to the upper half of the bearing hole 51. Hiding as used in the present disclosure means covering to such an extent that the user cannot see it when assembled as the HUD 1 or assembled into a vehicle. By doing so, structurally complicated parts such as the bearing hole 51 are hidden, making it possible to create a simple appearance. In addition, in the configuration of this embodiment that uses the bearing 50, the bearing 50 is used. The fact that the bearing 50, which is often made of shiny stainless steel, is visible from the outside of the HUD is particularly likely to cause stray light, so hiding the bearing hole 51 with the protrusion also hides the bearing 50, which is a special feature. It has the effect of
Further, the protruding portion 42 may have a shape that is plane symmetrical 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 part 40 is used for the left and right bearing parts, and one bearing part is used in a position where the other bearing part is rotated 180 degrees in the horizontal direction, it can be visually recognized from above. Since the shapes of the left and right protrusions 42 are symmetrical, the appearance can be simplified.

The positioning pin 491 and the positioning hole 492 are fitted with holes and pins oriented correspondingly to the lower case 12 and the upper case 11, thereby determining the position of the bearing portion 40. Furthermore, it is desirable that these positioning means be provided at symmetrical positions with respect to a plane that includes the rotation axis A and extends in the direction Y (direction UD). According to this configuration, when the vehicle C has a right-hand drive specification and a left-hand drive specification, the bearing portion 40 can be easily used for each specification.

The knob 493 is a projection that can be grasped by an operator when assembling the HUD. For example, when the reflecting section 30 and the bearing section 40 (including the bearing 50) are in a sub-assembly state, the state is as shown in FIG. 3. Since the knob 493 is not provided on the reflecting mirror 31 or the holder 32, the operator can perform assembly work without distorting the reflecting mirror 31 or touching the mirror surface and soiling it.

The bearing 50 is a sliding bearing for improving the sliding properties of the reflecting section 30 when it rotates. For example, in this embodiment, the bearing 50 is a ball bearing.
By making the diameter of the inner surface 51 approximately 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 section 30 is press-fitted into the inner surface 51 means that the inner surface 51 is a bearing hole.
By making the diameter of the outer surface 52 roughly 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 with the bearing 50 press-fitted therein.

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

FIG. 8 is a diagram illustrating the view angle toward the vicinity of the bearing hole 51 through the window portion 111. It can be confirmed that the bearing hole 51 is not visible from this angle of view due to the protrusion 34 and the protrusion 42. The inventor also considered a configuration in which the bearing hole 51 is hidden by protruding a wall portion from the upper case body (51) as shown in Patent Document 1. However, the upper case 11 and the bearing hole 51 are often installed at separate positions in a head-up display, and due to this positional relationship, when the upper case 11 is provided with a protrusion to hide the bearing hole 51, the wall thickness may be reduced. It becomes thin and difficult to mold. Therefore, as in the configuration of the present disclosure, hiding the bearing hole 51 with members such as the bearing portion 40 and the reflecting portion 30 that are close to the bearing hole 51 can prevent the bearing hole 51 from being exposed with a very simple configuration. It has a special effect.

Although the head-up display of the present invention has been explained using the configuration of the embodiment described above as an example, the present invention is not limited to this, and other configurations may be used without departing from the gist of the present invention. Of course, various improvements and changes in display are possible within the scope.

For example, in the present disclosure, a configuration using the bearing 50 is illustrated, but this may be omitted. Instead, the press-fit hole 41 may be used 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. Even with this configuration, if the protruding portion is provided in a protruding shape to the extent that it hides the bearing hole, it is possible to hide the bearing hole, and a favorable appearance can be achieved.

Further, in the first embodiment, a configuration using the bearing portion 40 was illustrated. However, by eliminating the bearing part 40 and press-fitting the bearing 50 directly into the lower case 12, the bearing part 50 may be used as a single bearing part.

Furthermore, in the first embodiment, one of the two bearing sections 40 in the direction L was mainly explained. Further, a configuration in which the holder 32 is provided with a protrusion 34 is illustrated. This is because, in order to make the explanation easier to understand, the explanation focused on one of the two bearing holes, the bearing hole 51 located in the direction L. Therefore, if it is desired to hide the other bearing hole in the direction R, at least one protrusion in the direction R may be used to hide it. Further, by combining a plurality of protrusions, the bearing hole may be substantially hidden.

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

[Effect example]
First, the head-up display of the present disclosure includes:
A head-up display 1 that projects a virtual image V by projecting display light Li onto a windshield WS,
a display section 20 that emits display light Li;
a reflecting section 30 that reflects the display light Li and can adjust the direction in which the display light Li is reflected by rotating around a predetermined rotation axis A;
A bearing part 40 having a bearing hole 51 defining the rotation axis A,
The reflecting section 30 is
The bearing hole is hidden by having a protrusion that protrudes in the direction of the reflecting surface.

According to this configuration, the head-up display has a simple configuration and can hide the hole into which the shaft of the rotatable reflector is inserted.

Second, the head-up display of the present disclosure is
The reflecting section 30 is
a reflecting mirror 31 that reflects the display light Li;
A holder 32 that holds a reflecting mirror 31 and has a shaft 332 that is rotatable around a rotation axis A is provided,
The holder 32 has a plate-shaped protrusion 34 having a surface parallel to a surface perpendicular to the rotation axis A.

Thirdly, the head-up display of the present disclosure is
A head-up display 1 that projects a virtual image V by projecting display light Li onto a windshield WS,
a display section 20 that emits display light Li;
a reflecting section 30 that reflects the display light Li and can adjust the direction in which the display light Li is reflected by rotating around a predetermined rotation axis A;
A bearing part 40 having a bearing hole 51 defining the rotation axis A,
The bearing part 40 is
The bearing hole 51 is hidden by having the protruding part 42 that protrudes from the bearing hole in the direction of the reflecting part 30.

Fourth, the head-up display of the present disclosure includes:
Further comprising an upper case 11 having a window portion 111 through which the display light Li passes,
The bearing hole 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 seen from the window 111.

1 Head-up display

11 Upper case 110 Window section 12 Lower case

20 Display section

30 Reflector 31 Reflector 32 Holder 331 Receiver 332 Shaft 34 Projection 35 Adhesive surface 36 Holder lever

40 Bearing portion 41 Press-fit hole 42 Projection portion 491 Positioning pin 492 Positioning hole 493 Knob 50 Ball bearing 51 Inner surface (bearing hole)
52 External surface

C Vehicle Li Display light A Rotating shaft WS Windshield (reflective transmissive member)
EP viewpoint (eye point)

Claims (1)

A head-up display that projects a virtual image by projecting display light onto a reflective-transmissive member,
a display unit that emits the display light;
a reflecting part that reflects the display light and can adjust the direction in which the display light is reflected by rotating around a predetermined rotation axis;
a bearing portion having a bearing hole that defines the rotation axis;
comprising a casing having a window through which the display light passes ;
The bearing portion includes a main body portion forming the bearing hole, and a side surface portion facing the reflecting portion of the main body portion,
The bearing portion has a protruding portion formed on the side surface portion and protruding from the bearing hole in a direction in which the reflecting portion is located ,
The protruding portion is formed only on the window portion side of the periphery of the bearing hole,
In the head-up display, the protrusion portion hides the bearing hole to such an extent that the bearing hole cannot be seen from the window portion .

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