JP-2026075264-A - Head-up display device

JP2026075264AJP 2026075264 AJP2026075264 AJP 2026075264AJP-2026075264-A

Abstract

[Problem] To provide a head-up display device that can increase design flexibility while suppressing stray light from reaching the eye box. [Solution] The head-up display device 100 displays a virtual image V by projecting display light L onto the windshield 201. The head-up display device 100 comprises a display device 10 that emits display light L, a housing 60 to which the display device 10 is mounted and which has an opening 61 through which the display light L toward the windshield 201 passes, and a cover 40 that transmits the display light L and closes the opening 61. The cover 40 has an incident surface 40i to which the display light L is incident and an outgoing surface 40o to which the display light L is emitted. The incident surface 40i and the outgoing surface 40o are each formed to curve along a part of the circumference of a virtually set ellipse. The cover 40 refracts the display light L. [Selection Diagram] Figure 1

Inventors

矢▲崎▼ 彰

Assignees

日本精機株式会社

Dates

Publication Date: 20260508
Application Date: 20241022

Claims (5)

A head-up display device that displays an image by projecting display light onto a projection target, A display device that emits the aforementioned display light, A housing having an opening through which the display light directed toward the projected member passes, and to which the display device is mounted, The system includes a cover through which the display light passes and which closes the opening, The cover has an incident surface into which the display light is incident and an outgoing surface from which the display light is emitted. The incident surface and the exit surface are each formed by curving along a portion of the circumference of a hypothetically defined ellipse, The cover refracts the display light. Head-up display device.
A head-up display device that displays an image by projecting display light onto a projection target, A display device that emits the aforementioned display light, A housing having an opening through which the display light directed toward the projected member passes, and to which the display device is mounted, The system includes a cover through which the display light passes and which closes the opening, The cover has an incident surface into which the display light is incident and an outgoing surface from which the display light is emitted. The incident surface and the exit surface are formed by curving along a portion of the circumference of a hypothetically defined ellipse, The thickness of the aforementioned cover is not constant. Head-up display device.
The aforementioned cover exhibits a higher lens effect compared to another cover in which the incident and exit surfaces are parallel, because the incident and exit surfaces are not parallel. The head-up display device according to claim 1 or 2.
The semi-major and semi-minor axes of the ellipse on the incident surface are different from the semi-major and semi-minor axes of the ellipse on the exit surface, respectively. The head-up display device according to claim 1 or 2.
The semi-major axis of the ellipse on the incident surface is shorter than the semi-major axis of the ellipse on the exit surface. The head-up display device according to claim 4.

Description

This disclosure relates to a head-up display device. The image projector described in Patent Document 1 comprises a display unit that emits image light, a concave mirror that magnifies and reflects an image directly incident from the display unit, a housing that houses the display unit and the concave mirror, and a lens positioned at the opening of the housing that magnifies the image incident from the concave mirror and outputs it to the front windshield. This lens is either a biconvex or plano-convex lens. The head-up display device described in Patent Document 2 comprises a display device that emits display light, a concave mirror that magnifies and reflects the display light from the display device toward the windshield, and a housing that houses the display device and the concave mirror. The opening of this housing is closed by a window portion formed in the shape of a curved plate from a light-transmitting resin material such as acrylic, through which the display light passes. Japanese Patent Publication No. 2006-91104Japanese Patent Publication No. 2024-075830 This is a schematic diagram of a vehicle equipped with a head-up display device according to one embodiment of the present disclosure.This is a schematic diagram showing two ellipses for designing the incident and exit surfaces of a cover according to one embodiment of the present disclosure.(A) is a schematic side view showing display light passing through a cover without a lens effect according to a comparative example, and (B) is a schematic side view showing display light passing through a cover with a lens effect according to one embodiment of the present disclosure.This is a schematic side view showing a cover, windshield, and ellipse, etc., according to one embodiment of the present disclosure.This is a schematic diagram showing two ellipses for designing the incident and exit surfaces of a cover according to a modified example of the present disclosure. A head-up display device according to one embodiment of this disclosure will be described with reference to the drawings. As shown in Figure 1, the head-up display device 100 is installed in the dashboard of the vehicle 200. The head-up display device 100 emits display light L representing an image toward the windshield 201, which is the front glass of the vehicle 200. The display light L is reflected by the windshield 201 and reaches the eye box EB. As a result, when the viewer 1 (mainly the driver of the vehicle 200) has their viewpoint within the eye box EB, a virtual image V is visible superimposed on the scenery in front of the vehicle 200. The eye box EB is the range of the viewer 1's viewpoint (eye point) in which the virtual image V can be seen. The vehicle 200 is provided with a light-absorbing section 205 that absorbs sunlight SL reflected by the emission surface 40o of the head-up display device 100, which will be described later. The light-absorbing section 205 is made of black, which does not reflect light easily, and is located in front of the emission surface 40o as part of the dashboard. In the following explanation, the X direction is the left-right direction (vehicle width direction) relative to observer 1, the Y direction is the up-down direction (height direction) relative to observer 1, and the Z direction is the depth direction (vehicle front-to-back direction) relative to observer 1. The head-up display device 100 comprises a display device 10, a folding mirror 20, a concave mirror 30, a housing 60, and a cover 40. The folded mirror 20 and the concave mirror 30 constitute an optical relay that guides the display light L from the display device 10 to the windshield 201. The folding mirror 20 reflects the display light L from the display device 10 toward the concave mirror 30. The folding mirror 20 is a planar mirror. Note that the folding mirror 20 is not limited to a planar mirror, but may also be a free-form surface mirror. The concave mirror 30 reflects the display light L from the folded mirror 20, amplifying it as it is directed towards the windshield 201. The display device 10 generates display light L to display the virtual image V and radiates the generated display light L toward the folding mirror 20. The display device 10 can be of any type; for example, it may be a type using a liquid crystal panel or a type using a DMD (Digital Micro Mirror Device) element. The housing 60 contains the display device 10, the concave mirror 30, and the folding mirror 20. The housing 60 is made of a non-transparent resin or metal and is a hollow, substantially rectangular parallelepiped. An opening 61 is formed in the housing 60 at a position facing the windshield 201. The cover 40 is made of a translucent material that transmits display light L, specifically a translucent synthetic resin such as polycarbonate (PC), acrylic resin (PMMA), cyclic olefin copolymer (COC), or cycloolefin polymer (COP). The cover 40 may be made of translucent glass. The cover 40 is formed in the