WO2016204021A1

WO2016204021A1 - Head-up display device

Info

Publication number: WO2016204021A1
Application number: PCT/JP2016/066882
Authority: WO
Inventors: 宏幸古澤; 孝紀茂野
Original assignee: 日本精機株式会社
Priority date: 2015-06-15
Filing date: 2016-06-07
Publication date: 2016-12-22
Also published as: JP2017003897A; JP6540253B2

Abstract

The purpose of the present invention is to provide a technology capable of suppressing reflection of a light-shielding section. A head-up display device (10) is formed by an emission device (20) for emitting light being accommodated within a case (11), and the emission device (20) being covered above by a light-shielding part (42). A low-reflection sheet (50) for suppressing the reflection of sunlight is affixed to an upper surface (42a) of the light-shielding part (42). Further, an up-down wall section (43) is adjacent to the light-shielding part (42) and extends in the up-down direction. The surface of the up-down wall section 43 has been coated in order to suppress the reflection of sunlight. The surface roughness of a border section (44), which is a border between the light-shielding part (42) and the up-down wall section (43), is rougher than the upper surface of the light-shielding part (42) and smoother than the surface of the up-down wall section (43).

Description

Head-up display device

The present invention relates to an improved head-up display device.

A vehicle such as a vehicle may be equipped with a head-up display device capable of projecting information in front of an occupant. An occupant can obtain information by visually recognizing a virtual image projected forward. As a conventional technique related to a head-up display device, there is a technique disclosed in Patent Document 1.

A head-up display device as shown in Patent Document 1 has upper and lower cases that can be divided, and an emission device that is housed in these cases and can emit light.

In the upper case, there are formed an opening through which light emitted from the emitting device passes and a light shielding portion that overlaps part of the opening and blocks sunlight. The light emitted from the emission device passes through the opening and is projected onto the projection surface.

By the way, a part of the light blocked by the light blocking portion may be reflected toward the projection surface portion such as the windshield. In this case, the reflected light can be reflected on the projection surface. There is room for improvement in this regard.

JP 2010-152025 A

This invention makes it a subject to provide the technique which can suppress the reflection of a light-shielding part.

According to the invention according to claim 1, in the head-up display device in which the emission device for emitting light is accommodated in the case, and the upper portion of the emission device is covered by the light shielding portion.
A head-up display device is provided in which a low-reflection sheet that suppresses reflection of sunlight is attached to an upper surface of the light-shielding portion.

As described in claim 2, preferably, an upper and lower wall portion extends in the vertical direction adjacent to the light shielding portion,
The surface of the upper and lower wall portions is rougher than the upper surface of the light shielding portion by being coated to suppress reflection of sunlight,
The surface roughness of the boundary portion, which is the boundary between the light shielding portion and the upper and lower wall portions, is rougher than the upper surface of the light shielding portion and smoother than the surfaces of the upper and lower wall portions.

In the invention according to claim 1, a low-reflection sheet that suppresses reflection of sunlight is attached to the upper surface of the light shielding portion. Thereby, the reflection of the light shielding part on the projection surface part can be suppressed.

Usually, the light shielding part has a so-called three-dimensional shape in which the curvature continuously changes. By attaching a low reflection sheet to such a light shielding part, the reflection of sunlight can be suppressed evenly over the entire upper surface of the light shielding part. For example, it is assumed that a paint for suppressing reflection is applied to the light shielding portion. In this case, it is difficult to uniformly apply to the whole, and there is a possibility that a part where the reflection of sunlight cannot be suppressed partially occurs. If a large amount of paint is applied to prevent this, it takes time to paint. In this regard, according to the present invention in which the low-reflection sheet is attached, it is possible to suppress the reflection of sunlight uniformly over the entire upper surface of the light-shielding portion and contribute to shortening the manufacturing time of the head-up display device.

In the invention according to claim 2, the surface of the upper and lower wall portions extending in the vertical direction adjacent to the light shielding portion is coated to suppress reflection of sunlight. The upper and lower wall portions extending in the vertical direction are portions where reflection on the projection surface portion hardly occurs. For this reason, even if it is a cheap coating compared with a low reflection sheet, reflection of an upper and lower wall part can fully be suppressed.

In addition, the roughness of the surface of the boundary, which is the boundary between the light shielding portion and the upper and lower wall portions, is rougher than the upper surface of the light shielding portion and smoother than the surfaces of the upper and lower wall portions. The upper surface of the light shielding part is formed smoothly so that a low reflection sheet can be attached. On the other hand, the upper and lower walls are roughened by being painted. Here, it is conceivable to extend the end portion of the low reflection sheet to the end portions of the upper and lower wall portions and cover the boundary portion. However, if the low reflection sheet is extended to the upper and lower wall portions having a rough surface, the low reflection sheet may be peeled off from the surface of the upper and lower wall portions. On the other hand, when the end portion of the low reflection sheet is located at the smooth boundary portion of the surface, the exposed portion of the boundary portion may be reflected on the projection surface portion. For this reason, the roughness of the surface of the boundary portion is set to be rougher than the upper surface of the light shielding portion and smoother than the surfaces of the upper and lower wall portions. Thereby, reflection of a boundary part can be suppressed, suppressing that a low reflective sheet peels.

1 is a perspective view of a head-up display device according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 2 is a perspective view of an upper case shown in FIG. 1. It is a figure explaining sticking to the light-shielding part of the low reflection sheet shown by FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is an enlarged view of 6 parts in FIG. 5. It is a figure explaining the comparative example of the head-up display apparatus shown by FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, left and right refer to the left and right based on the vehicle occupant, and front and rear refer to the front and rear based on the traveling direction of the vehicle. In the figure, Fr indicates the front, Rr indicates the rear, Le indicates the left when viewed from the occupant, Ri indicates the right when viewed from the occupant, Up indicates the upper side, and Dn indicates the lower side.
<Example>

Refer to FIG. 1 and FIG. The head-up display device 10 is mounted on a vehicle, for example. An occupant can recognize information by visually recognizing a virtual image projected on the windshield of the vehicle.

The head-up display device 10 includes an emission device 20 for emitting information inside the case 11. Inside the case 11, a plane mirror 13 and a concave mirror 14 for reflecting the light emitted from the emission device 20 are attached. The upper part of the case 11 is formed in an opening shape, and a transparent cover 15 made of a transparent film is put on the opening.

The case 11 is formed by covering the lower case 30 with the upper case 40.

The emitting device 20 includes an LED backlight 21, a first lens 22 through which light emitted from the backlight 21 passes, and a reflecting mirror 23 that reflects the light that has passed through the first lens 22 upward. And a second lens 24 through which light reflected by the reflecting mirror 23 passes, and a liquid crystal panel 25 on which information is displayed by irradiation with the light that has passed through the second lens 24.

The light that has passed through the liquid crystal panel 25 is reflected by the plane mirror 13 and the concave mirror 14, passes through the translucent cover 15, and is emitted to the outside of the case 11. The emitted light is projected onto the windshield of the vehicle. It can be said that the windshield is a projection surface portion on which light is projected.

The flat mirror 13 is a reflecting mirror in which a flat reflecting surface is formed by depositing a metal such as aluminum on the surface of a resin member such as polycarbonate (PC). The plane mirror 13 reflects the light emitted from the emitting device 20 toward the concave mirror 14. The optical path length until the reflected light reaches the windshield becomes longer, and a virtual image can be displayed in front of the windshield.

The concave mirror 14 is, for example, a reflecting mirror in which a concave reflecting surface is formed by depositing a metal such as aluminum on the surface of a resin member such as polycarbonate. The light reflected by the reflecting surface of the concave mirror 14 is magnified, and a large virtual image can be displayed on the windshield even if the emitting device 20 is made of a relatively small and inexpensive one. The concave shape of the reflecting surface of the concave mirror 14 is designed so as to cancel out distortion caused by the curved shape of the windshield.

The translucent cover 15 is made of a translucent resin material such as polymethyl methacrylate resin (PMMA). The periphery of the translucent cover 15 is a cover mask portion 15a formed by black printing. The cover mask portion 15 a is formed continuously on the periphery of the translucent cover 15. The cover mask portion 15 a is configured to prevent external light such as sunlight from entering the inside of the case 11. This is because if sunlight is incident, the display quality of the virtual image may be degraded.

The lower case 30 is made of a resin material such as polypropylene (PP), for example. The lower case 30 is formed with a storage portion 31 for storing the emission device 20, a mounting portion 32 of the flat mirror 13, and a mounting portion 33 of the concave mirror 14.

The upper case 40 is made of, for example, a mixed resin material of polycarbonate and polyethylene terephthalate (PET). An upper end of the upper case 40 is an opening 41 covered with a translucent cover 15. The upper case 40 is formed with a light shielding portion 42 for blocking a part of the opening 41 and blocking sunlight toward the emitting device 20. The light shielding part 42 extends substantially in parallel to the windshield (projection surface part). That is, it can be said that it is one of the parts most easily reflected on the projection surface.

Refer to FIG. An upper and lower wall portion 43 extends downward from the right front end of the light shielding portion 42. The upper and lower wall portions 43 extend in a substantially vertical direction. The boundary between the light shielding portion 42 and the upper and lower wall portions 43 is a boundary portion 44 set to a predetermined surface roughness.

At the right end of the light shielding part 42, an upper and lower wall part 45 constituting a side wall of the upper case 40 extends in the vertical direction. The upper and lower wall portions 45 extend in a substantially vertical direction. The boundary between the light shielding portion 42 and the upper and lower wall portions 45 is a boundary portion 46 set to a predetermined surface roughness. The same applies to the left end of the light shielding portion 42.

Refer to FIG. 2 and FIG. The light shielding part 42 has a curved shape whose curvature changes continuously. A low reflection sheet 50 that suppresses reflection of sunlight is affixed to the upper surface of the light shielding portion 42. The low reflection sheet 50 is a black sheet with urethane foam applied to the surface. It is desirable that the low reflection sheet 50 further has excellent heat resistance and generates little volatile gas (low outgas). The upper part of the front end of the low reflection sheet 50 is covered with a cover mask portion 15a. In the next figure, an example of the manufacturing method of the low reflection sheet 50 and the sticking of the low reflection sheet 50 to the light shielding part 42 will be described.

Refer to FIG. First, a polyester sheet 51 is prepared. Reference is made to FIG. A double-sided tape 52 is attached to one side of the sheet base 51, and a release paper 53 is attached to one side of the double-sided tape 52. Reference is made to FIG. The low reflection sheet 50 is manufactured by applying the urethane foam 54 to the other surface of the sheet base 51.

Refer to FIG. 4 (d). The release paper 53 (FIG. 4C) is peeled off, and the double-sided tape 52 is affixed to the upper surface 42a (see FIG. 2) of the light shielding portion 42. Thereby, the sticking of the low reflection sheet 50 is stuck.

Refer to FIG. The upper and lower wall portions 43 are black-coated on the surface (front surface).

Refer to FIG. The surface of the upper and lower wall portions 43 is rougher than the upper surface 42 a of the light shielding portion 42. For example, the surface roughness Ra of the surface of the upper and lower wall portions 43 is 40 to 50 μm.

The roughness of the surface of the boundary part 44 is rougher than the upper surface 42a of the light shielding part 42 and smoother than the surfaces of the upper and lower wall parts 43. For example, the surface roughness Ra of the surface of the boundary portion 44 is 20 μm. Examples of a method for forming the surface of the boundary portion 44 to be rougher than the surface of the light shielding portion 42 include methods such as adjusting a mold, applying a chemical, and performing sandblasting. In addition to these methods, any method can be employed.

The end of the low reflection sheet 50 reaches the upper end of the boundary 44. This prevents the upper surface 42a of the light shielding part 42 from being exposed.

Note that the length L of the boundary portion 44 is desirably 2 mm or more and 5 mm or less. The reason will be described later.

The present invention described above has the following effects.

Refer to FIG. A low reflection sheet 50 that suppresses reflection of sunlight is affixed to the upper surface of the light shielding portion 42. Thereby, the reflection of the light shielding part 42 on the projection surface part can be suppressed.

Usually, the light shielding part 42 exhibits a so-called three-dimensional curved shape in which the curvature continuously changes. By attaching the low reflection sheet 50 to such a light shielding part 42, the reflection of sunlight can be suppressed evenly over the entire upper surface 42 a of the light shielding part 42. For example, it is assumed that a paint for suppressing reflection is applied to the light shielding portion 42. If it has a three-dimensional shape, it is difficult to uniformly apply to the whole, and there is a possibility that a part where the reflection of sunlight cannot be suppressed partially occurs. If a large amount of paint is applied to prevent this, it takes time to paint. In this regard, according to the present invention in which the low-reflection sheet 50 is pasted, the reflection of sunlight can be suppressed uniformly over the entire upper surface 42a of the light-shielding portion 42, and the manufacturing time of the head-up display device 10 can be shortened. You can also.

Furthermore, the surface of the upper and lower wall portions 43 extending in the vertical direction from the light shielding portion 42 is coated to suppress the reflection of sunlight. The upper and lower wall portions 43 extending in the vertical direction are portions that are less likely to be reflected on the projection surface portion. For this reason, even if it is cheap coating compared with the low reflection sheet 50, reflection of the upper and lower wall portions 43 can be sufficiently suppressed. The same applies to the upper and lower wall portions 45 shown in FIG.

Referring also to FIG. The roughness of the surface of the boundary portion 44 that is the boundary between the light shielding portion 42 and the upper and lower wall portions 43 is rougher than the upper surface 42 a of the light shielding portion 42 and smoother than the surfaces of the upper and lower wall portions 43. The upper surface 42a of the light shielding part 42 is formed smoothly so that the low reflection sheet 50 can be attached. On the other hand, the upper and lower wall portions 43 are roughened by being painted.

Refer to FIG. Here, it is conceivable to extend the end portion of the low reflection sheet 150 to the end portion of the upper and lower wall portions 143 and cover the boundary portion 144.

Refer to FIG. 7 (b). For example, after completion of the head-up display device 110, it is generally performed to remove dust Du that may adhere to each component. The dust Du is removed, for example, by blowing wind.

Refer to FIG. At this time, if the low reflection sheet 150 is extended to the upper and lower wall portions 143 having a rough surface, the low reflection sheet 150 may be peeled off from the upper and lower wall portions 143 due to the wind blown around the surface of the upper and lower wall portions 143. On the other hand, when the end portion of the low reflection sheet 150 is located at the smooth boundary portion 144 on the surface, the exposed portion of the boundary portion 144 may be reflected on the projection surface portion.

Refer to FIG. For this reason, the roughness of the surface of the boundary portion 44 is set to be rougher than the upper surface 42 a of the light shielding portion 42 and smoother than the surfaces of the upper and lower wall portions 43. Thereby, it is possible to suppress the reflection of the boundary portion 44 on the projection surface portion while suppressing the amount of wind that wraps around the back surface of the low reflection sheet 50 and suppressing the peeling of the low reflection sheet 50. The same applies to the boundary portion 46 shown in FIG.

Furthermore, the length L of the boundary portion 44 is desirably 2 mm or more and 5 mm or less. If the length L of the boundary portion 44 is less than 2 mm, it is difficult to reliably attach the end portion of the low reflection sheet 50 to the upper portion of the boundary portion 44. In this case, a part of the light shielding part 42 may be exposed, or the end of the low reflection sheet 50 may be attached to the upper part of the upper and lower wall parts 43. If the light-shielding portion 42 that is a smooth surface is exposed, there is a possibility that it will be reflected on the projection surface portion. If the end portion of the low reflection sheet 50 is attached to the upper part of the upper and lower wall portions 43, the low reflection sheet 50 may be peeled off.

On the other hand, the boundary portion 44 is more likely to be reflected than the low reflection sheet 50 and the upper and lower wall portions 43. Such a part is desirably as small as possible.

That is, by setting the length L of the boundary portion 44 to 2 mm or more and 5 mm or less, the low reflection sheet 50 can be attached at an accurate position, and reflection of the boundary portion 44 can also be suppressed. The same applies to the boundary portion 46 shown in FIG.

Although the head-up display device according to the present invention has been described based on an example mounted on a vehicle, the head-up display device can also be applied to vehicles, work machines, construction machines, and the like other than vehicles. Furthermore, the head-up display device according to the present invention is not limited to the one using the windshield as the projection surface portion, but can be applied to a so-called combiner-integrated head-up display device in which the projection surface portion is integrated.

That is, the present invention is not limited to the examples as long as the operations and effects of the present invention are exhibited.

The head-up display device of the present invention is suitable for a vehicle.

DESCRIPTION OF SYMBOLS 10 ... Head-up display apparatus 11 ... Case 20 ... Ejection apparatus 42 ... Light-shielding part 42a ... Upper surface (of light-shielding part) 43, 45 ... Upper and

lower wall parts

44, 46 ... Boundary part 50 ... Low reflection sheet

Claims

In a head-up display device in which an emission device for emitting light is housed in a case, and an upper portion of the emission device is covered by a light shielding unit,
A head-up display device, characterized in that a low-reflection sheet that suppresses reflection of sunlight is attached to the upper surface of the light-shielding portion.
An upper and lower wall portion extends in the vertical direction adjacent to the light shielding portion,
The surface of the upper and lower wall portions is rougher than the upper surface of the light shielding portion by being coated to suppress reflection of sunlight,
2. The roughness of the surface of the boundary portion, which is a boundary between the light shielding portion and the upper and lower wall portions, is rougher than the upper surface of the light shielding portion and smoother than the surfaces of the upper and lower wall portions. The head-up display device described.