JP2021014153A - Head-up display - Google Patents

Abstract

To provide a head-up display which enables easy manufacturing.SOLUTION: A head-up display HUD of the disclosure includes: a translucent sheet 6; a display part 1 which outputs display light L; and a case 5 having a housing part 53 which houses the display part 1, an opening 521 for emitting the display light L to the outside, a frame-like placement part 522 which rims the opening 521, and a flame-like adhesion part 523 which is located at the outer edge side of the placement part 522 and lower than the placement part 522. The translucent sheet 6 contacts with the placement part 522, and the translucent sheet 6 and the case 5 are adhered by an adhesive 7 applied to the adhesion part 523.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a head-up display in which an opening that emits display light is covered with a translucent sheet.

The conventional head-up display emits display light to the outside of the device through the opening of the case. The display light emitted to the outside of the device is applied to the windshield of the vehicle, and a virtual image of the display light is displayed in front of the windshield when viewed from the driver of the vehicle.

The opening that emits the indicator light is covered with a translucent sheet to prevent dust. For example, in Patent Document 1, the translucent sheet is fixed to the peripheral edge of the opening with double-sided tape.

JP-A-2010-105555

In Patent Document 1, after peeling off the release liner covering the adhesive surface of the double-sided tape, the double-sided tape is attached along the peripheral edge of the opening. This pasting process is difficult to automate and has low manufacturability.

It is an object of the present disclosure to provide a head-up display that is easy to manufacture in consideration of the above-mentioned problems.

The head-up display of the present disclosure is
With a translucent sheet,
A display unit that outputs display light and
An accommodating portion for accommodating the display portion, an opening for emitting the display light to the outside, a mounting portion for edging the opening, and a frame-shaped adhesive portion on the outer edge side of the previously described placing portion and lower than the previously described placing portion. , With a case,
The translucent sheet comes into contact with the above-mentioned placed portion, and the translucent sheet and the case are adhered by an adhesive applied to the adhesive portion.

According to the present disclosure, it is possible to provide a head-up display that is easy to manufacture.

Schematic diagram of the configuration of the head-up display. Perspective view of the upper case. Configuration perspective view of the upper case. Enlarged perspective view of the main part of the upper case. AA sectional view of the upper case. BB sectional view of the upper case.

The head-up display HUD of the present disclosure will be described below with reference to the accompanying drawings (FIGS. 1-6).

See FIG. The head-up display HUD is mounted on the instrument panel of the vehicle and emits the display light L to the windshield WS of the vehicle. The display light L represents vehicle information such as the traveling speed of the vehicle, warning information of the vehicle, and route guidance information. When the passenger E of the vehicle sees the windshield WS from the visible region DA, the virtual image V of the display light L can be seen in front of the windshield WS.

The head-up display HUD is mainly composed of a display unit 1, a reflection unit 2, a drive unit 3, a control unit 4, and a case 5 accommodating these.

The display unit 1 is a display device that displays an image such as a liquid crystal display, an organic EL display, or a rear projection type projector. The display unit 1 displays an image representing vehicle information, and outputs a display light L representing this image.

The reflecting unit 2 is a reflecting mirror that reflects the display light L. The reflecting portion 2 is composed of a planar mirror 21 and a concave mirror 22.

The flat mirror 21 reflects the display light L output from the display unit 1 toward the concave mirror 22.

The concave mirror 22 reflects the light reflected by the planar mirror 21 toward the windshield WS.

The drive unit 3 is a drive mechanism that rotates the concave mirror 22 around the rotation axis AX. The drive unit 3 rotates the concave mirror 22 by rotating the motor, for example.

The control unit 4 is a control circuit board that controls the display unit 1 and the drive unit 3. The control unit 4 causes the display unit 1 to display an image representing vehicle information. Further, the control unit 4 can control the drive unit 3 to adjust the position of the visible region DA according to the eye height of the passenger E. Specifically, the control unit 4 controls the drive unit 3 to rotate the concave mirror 22 to change the position of the display light L projected on the windshield WS, and can move the visible region DA up and down. ..

Case 5 is a black resin case such as polycarbonate. The case 5 is composed of a lower case 51 and an upper case 52. The case 5 has a housing portion 53 covered with a lower case 51 and an upper case 52. The accommodating unit 53 accommodates the display unit 1, the reflecting unit 2, the driving unit 3, and the control unit 4.

The upper case 52 will be described in detail with reference to FIGS. 2 to 6.

The upper case 52 has an opening 521 for emitting the display light L to the outside of the case 5. The upper case 52 has a translucent sheet 6 that covers the opening 521.

A frame-shaped mounting portion 522 surrounding the opening 521 is formed on the outer edge of the opening 521 of the upper case 52. The mounting portion 522 supports the translucent sheet 6. The mounting portion 522 has a curved surface that is inclined with respect to the front-rear direction (X direction) of the vehicle. Due to this curved surface, external light such as sunlight is reflected by the translucent sheet 6 and then does not go to the visible region DA through the windshield WS.

A frame-shaped adhesive portion 523 surrounding the mounting portion 522 is formed on the outer edge of the mounting portion 522 of the upper case 52. An adhesive 7 is applied to the adhesive portion 523, and the translucent sheet 6 supported by the mounting portion 522 is fixed. The adhesive portion 523 is a concave groove that is recessed one step from the mounting surface of the mounting portion 522.

The upper case 52 has a positioning portion 523. The positioning unit 523 positions the light-transmitting sheet 6 on the mounting unit 522 in the X direction and the Y direction.

The upper case 52 has a stopper portion 524. The stopper portion 524 prevents the translucent sheet 6 from peeling off from the upper case 52 and falling off. The stopper portion 524 is provided at a position having the highest curvature on the curved surface of the mounting portion 522. The stopper portion 524 is formed at a position separated by a predetermined distance in the plane perpendicular direction (Z direction) from the mounting surface of the mounting portion 522. When the translucent sheet 6 is elastically deformed and in contact along the curved surface of the mounting portion 522, the translucent sheet 6 and the stopper portion 524 do not come into contact with each other. When the translucent sheet 6 separates from the curved surface and the elastic deformation amount returns to a predetermined deformation amount, the translucent sheet 6 comes into contact with the stopper portion 524.

The translucent sheet 6 is a flat plate-shaped dustproof cover that covers the opening 521. The translucent sheet 6 is mainly composed of a base material 61 made of a translucent resin such as an acrylic resin or a polycarbonate resin, and a black printing layer 62 formed on the surface of the base material 61. The translucent sheet 6 is installed on the mounting portion 522 with the adhesive 7 applied to the adhesive portion 523.

The light-transmitting sheet 6 has an exit window portion 63 that transmits the display light L emitted from the opening 521, and a frame-shaped light-shielding frame portion 64 that surrounds the exit window portion 63.

The light-shielding frame portion 64 is composed of a light-shielding portion 641 that covers the edge of the opening 521 and the mounting portion 522 to block light, and a confirmation window portion 642 that allows the adhesive 7 applied to the adhesive portion 523 to be visually recognized. .. Of the light-shielding frame portion 64, the light-shielding portion 641 is a portion where the print layer 62 is formed, and the confirmation window portion 642 is a portion where the print layer 62 is not formed.

The size of the confirmation window portion 642 is determined according to the lower limit of the amount of the adhesive 7 applied to the adhesive portion 523. That is, poor adhesion can be confirmed by visually inspecting the confirmation window portion 642 or by mechanically inspecting the image.

The translucent sheet 6 is formed with a positioning slit 65 that engages with the positioning portion 524 of the lower case 5. The positioning slit 65 is aligned with the positioning portion 524 of the lower case 5, and the translucent sheet 6 is positioned at the mounting portion 522 in the X and Y directions.

The translucent sheet 6 has a slit 66 formed at a position corresponding to the stopper portion 524 of the lower case 5. The slit 66 is a notch for facilitating the assembly of the translucent sheet 6 under the stopper portion 524, and may be omitted.

The adhesive 7 is a liquid adhesive, which is applied to the adhesive portion 523 and then cured to bond and fix the adhesive portion 523 and the translucent sheet 6. The adhesive 7 is a hot melt adhesive, a photocurable adhesive, or various synthetic resin adhesives. The adhesive 7 is colored in a color different from the color of the upper case 52 (for example, blue or purple). The adhesive 7 is preferably a hot melt adhesive or a photocurable adhesive having a short curing time in consideration of manufacturability. In particular, in the case of a photocurable adhesive, the confirmation window portion 642 can be used for both confirmation of the applied adhesive and irradiation of curing light (ultraviolet rays or infrared rays).

The head-up display HUD of the present disclosure includes a translucent sheet 6, a display unit 1 that outputs display light L, a storage unit 53 that houses the display unit 1, an opening 521 that emits display light L to the outside, and an opening. The case 5 includes a frame-shaped mounting portion 522 that borders the 521, and a frame-shaped adhesive portion 523 that is on the outer edge side of the mounting portion 522 and is lower than the mounting portion 522.
Then, the translucent sheet 6 comes into contact with the mounting portion 522, and the translucent sheet 6 and the case 5 are adhered to each other by the adhesive 7 applied to the adhesive portion 523.
With this configuration, the translucent sheet 6 has high dust resistance because its outer edge is adhered to the frame-shaped mounting portion 522 in contact with the mounting portion 522. Further, the thickness of the adhesive 7 can be easily controlled by contacting the frame-shaped mounting portion 522. Therefore, a case having a simple structure and high dust resistance can be easily manufactured.

Further, the translucent sheet 6 of the head-up display HUD of the present disclosure has a light-shielding frame portion 64 surrounding the opening 521. Then, the light-shielding frame portion 64 has a confirmation window portion 642 in which the adhesive 7 applied to the adhesive portion 523 can be visually recognized.
With this configuration, poor adhesion can be easily confirmed by visually or mechanically inspecting the confirmation window portion 642.

Further, the mounting portion 522 of the head-up display HUD of the present disclosure has a curved surface. Then, the case 5 has a stopper portion 525 that comes into contact with the translucent sheet 6 when the translucent sheet 6 elastically deformed and placed along the curved surface returns to a predetermined amount of deformation away from the curved surface. Have.
With this configuration, it is possible to prevent the translucent sheet 6 from falling off from the upper case 52.

In the head-up display HUD of the present disclosure, the mounting portion 522 and the adhesive portion 523 are configured in a frame shape that seamlessly borders, but the present invention is not limited to this. In order to improve dust resistance, it is preferable that both the mounting portion 522 and the adhesive portion 523 are formed in a seamless frame shape, but only one of them may be in a seamless frame shape. It is preferable that at least the adhesive portion 523 has a seamless frame shape and the adhesive 7 is applied in a seamless frame shape. Further, the mounting portion 522 may be provided on the outer edge side of the adhesive portion 523, but this is not preferable because the adhesive 7 may flow into the opening 521.

L: Display light HUD: Head-up display 1: Display unit 2: Reflection unit 21: Plane mirror 22: Concave mirror 3: Drive unit 4: Control unit 5: Case 51: Lower case 52: Lower case 521: Opening 522: Mounting Part 523: Adhesive part
524: Stopper part 525: Positioning part 53: Accommodating part 6: Translucent sheet 61: Base material 62: Printing layer 63: Exit window part 64: Light-shielding frame part 641: Light-shielding part 642: Confirmation window part

Claims (3)

With a translucent sheet,
A display unit that outputs display light and
It has an accommodating portion for accommodating the display portion, an opening for emitting the display light to the outside, a mounting portion for bordering the opening, and an adhesive portion on the outer edge side of the previously described mounting portion and lower than the previously described mounting portion. With a case,
The translucent sheet comes into contact with the above-mentioned placing portion, and the translucent sheet and the case are adhered by an adhesive applied to the adhesive portion.
Head-up display. The translucent sheet has a light-shielding frame portion that surrounds the opening.
The light-shielding frame portion has a confirmation window portion in which the adhesive applied to the adhesive portion can be visually recognized.
The head-up display of claim 1. The previously described rest has a curved surface and
The case has a stopper portion that comes into contact with the translucent sheet when the translucent sheet elastically deformed and placed along the curved surface is separated from the curved surface and returned by a predetermined amount of deformation. Have,
The head-up display of claim 1.

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