JP2009229782A - Head-up display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a head-up display device capable of ensuring high accuracy by simply fitting optical components, such as a mirror, without having to carry out difficult adjustment. <P>SOLUTION: The head-up display device includes a display panel for displaying information image: an LED for emitting light to the display panel from its rear face; a first flat mirror, second flat mirror and concave mirror for reflecting and diverging image light emitted from the display panel; and a housing accommodating them. The housing has a base member 28 and a cover member. The base member 28 is formed integrally from a power source accommodating section 34, to which the LED is fixed; a panel-fixing section 40 to which the display panel is positioned and fixed; a first mirror fixing section 31, to which the first flat mirror is positioned and fixed; a second mirror fixing section to which the second flat mirror 32 is positioned and fixed; and a concave mirror fixing section 33, to which the concave mirror is positioned and fixed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a head-up display device for a moving body such as an automobile.

  A head-up display device is a device that displays information such as travel speed to a driver such as an automobile, and displays a virtual image of the displayed image on the windshield so that the driver can drive without looking away from the field of view. It is designed to recognize necessary information.

Patent Document 1 below describes an image projector for a head-up display that includes a convex lens that closes an opening and enlarges an image and outputs the enlarged image to a windshield display. The image projector includes a display that houses a light source and a liquid crystal display panel, a magnifying glass that magnifies image light emitted from the display, and further magnifies and projects the image light emitted from the magnifying glass onto the windshield. A convex lens is provided. The convex lens has a function of blocking the inside of the image projector and preventing dust from entering.
JP 2006-091104 A

  In the image projector described in Patent Document 1, a display, a magnifying glass, and a convex lens are housed in a housing, but an image to be displayed is displayed on a liquid crystal display panel housed in the display. Therefore, there is a problem that it is difficult to accurately align the image position with an optical system including a magnifying glass and a convex lens.

  In order to solve the above-mentioned problems, the present invention proposes a head-up display device that can ensure high accuracy by simply assembling an optical component such as a mirror without making difficult adjustments.

  A head-up display device according to the present invention enlarges an image displayed on a transmissive liquid crystal display panel by a plurality of mirrors, reflects the enlarged image on a windshield of a moving body, and allows the occupant of the moving body to receive the image. A head-up display device for a moving body for visually recognizing a virtual image of the transmissive liquid crystal display panel, a light source device that irradiates light from the back to the transmissive liquid crystal display panel, the plurality of mirrors, and a housing that houses these mirrors The housing includes a light source housing portion to which the light source device is fixed, a panel fixing portion to which the transmissive liquid crystal display panel is positioned and fixed, and a plurality of mirrors to which the plurality of mirrors are positioned and fixed, respectively. And a mirror fixing portion.

  A flat mirror having a reflecting surface for reflecting the image light emitted from the transmissive liquid crystal display panel in the vertical direction of the image is fixed to the housing, and is rotatably supported by the housing. The mirror holder includes a mirror holder capable of adjusting the tilt of the reflecting surface of the mirror, and the flat mirror is positioned on the mirror holder so that the rotation center line of the mirror holder is located on the reflecting surface. The plane mirror reflects incident image light toward the concave mirror and re-reflects the image light reflected by the concave mirror toward the windshield. The light source housing portion includes an attachment portion to which the light source device is attached and a tube portion formed in a cylindrical shape by a plurality of side walls provided upright on the attachment portion, and the panel formed on an end surface of the tube portion The transmissive liquid crystal display panel is fixed in close contact with a fixed portion so that light emitted from the light source device does not leak to the flat mirror side from between the fixed portion and the transmissive liquid crystal display panel. .

  According to the present invention, it is possible to provide a head-up display device in which optical components can be assembled with high accuracy and easily and image deterioration due to stray light is not required, with a simple structure, space saving, and low cost.

  As shown in FIG. 1, the head-up display device 10 is arranged on a dashboard 13 of an automobile (moving body) 12, emits an image related to various information such as a value of a speedometer, and reflects the image on a windshield 15, thereby (Crew) 16 A virtual image 18 obtained by enlarging the image is displayed at a few meters ahead. The driver 16 can visually recognize the image enlarged and displayed as the virtual image 18 without greatly moving the viewpoint from the front view even during driving.

  As shown in FIG. 2, the head-up display device 10 includes a transmissive liquid crystal display panel (hereinafter referred to as a display panel) 21 that displays an image in a housing 20 disposed under the dashboard 13. The front panel 20 is configured to reflect an LED (light source device) 22 that irradiates light on the back surface of the display panel 21 and an image light beam (image light) 23 emitted from the display panel 21 to emit light from the emission window 24 provided in the housing 20. A plurality of mirrors that are emitted toward the glass 15 and displayed in an enlarged manner. The plurality of mirrors includes a first flat mirror 26 that reflects the image light beam 23 emitted from the display panel 21 toward the second flat mirror 25, and an image light beam 23 from the first flat mirror 26 to the concave mirror 27. A second flat mirror 25 for reflecting the image light beam 23 reflected toward the front glass 15 through the exit window 24 and the concave mirror 27; The housing 20 includes a base member 28 and a cover member 29.

  The display panel 21 is a small display panel such as a 0.8 type, for example, and displays values of various instruments such as a tachometer, a water temperature gauge, and a fuel gauge in addition to a speedometer. Since the display panel 21 is small in size, the displayed image is also small, so that the image is magnified by the concave mirror 27. The concave mirror 27 corrects distortion caused by the windshield 15 as well as enlargement of the image. It becomes visible as a normal image through reflection by the curved surface. In this way, the image light beam 23 is reflected twice by the second flat mirror 25 to make the whole compact and to reduce the size of the head-up display device 10.

  As shown in FIG. 3, the base member 28 includes a pair of first plane mirror fixing portions 31 to which the first plane mirror 26 is positioned and fixed, and a pair to which the second plane mirror 25 is positioned and fixed. The second flat mirror fixing part 32 and a pair of concave mirror fixing parts 33 to which the concave mirror 27 is positioned and fixed. The first plane mirror fixing portion 31 is made to contact a wall surface 31a provided so as to sandwich two opposing sides of the first plane mirror 26, a receiving surface 31b receiving the reflecting surface side, and another one side corner portion. And a wall surface 31c for positioning. The second plane mirror fixing portion 32 includes a U-shaped rib 32 a provided so as to sandwich two opposing sides of the second plane mirror 25 and a receiving surface 32 b that receives the back surface side. The concave mirror fixing portion 33 includes a wall surface 33a provided so as to sandwich two opposing sides of the concave mirror 27 and a receiving surface 33b that receives the reflecting surface side. The other two sides of the concave mirror 27 are sandwiched between the wall surface 28a of the base member 28 and the wall surface 29a of the cover member 29 (see FIG. 2).

  The base member 28 is integrally formed with a light source accommodating portion 34 that accommodates the LED 22. The light source accommodating portion 34 includes an attachment portion 35 (see FIG. 2) to which the LED 22 is attached and a cylindrical portion 44 having a plurality of side walls 36 to 39 erected on the attachment portion 35. Of the side walls 36 to 39, the side wall 36 disposed on the second plane mirror 25 side and the end surfaces of the side walls 37 and 38 continuously provided on both sides thereof form an end surface 40a in a U-shape, and further, the end surface 40a A pair of step portions 40b and 40c having an L shape and an inverted L shape are formed on the outside, and a panel fixing portion 40 for positioning and fixing the display panel 21 is constituted by the end face 40a and the step portions 40b and 40c.

  Next, the operation of the above embodiment will be described. The panel fixing part 40, the first flat mirror fixing part 31, the second flat mirror fixing part 32, and the concave mirror fixing part 33 are formed on the base member 28 by integral molding, and their relative positions. High accuracy is ensured. Since the display panel 21, the first plane mirror 26, the second plane mirror 25, and the concave mirror 27 are respectively positioned and fixed to the respective fixing portions, the relative positions of these four optical members are both High accuracy is guaranteed. Further, since the display panel 21 is attached so as to be in close contact with the end face 40a, the light emitted from the LED 22 does not leak from between the end face 40a and the display panel 21 to the second flat mirror 25 side. .

  After the LED 22, the display panel 21, the first flat mirror 26, the second flat mirror 25, and the concave mirror 27 are assembled and fixed to the base member 28, the light is emitted from the second flat mirror 25. The position of the second reflected light is confirmed, and then the cover member 29 is attached.

  Next, another embodiment will be described. In the present embodiment, the second flat mirror 25 of the above-described embodiment is made adjustable, and the components other than the base member 28 are the same. Is omitted. As shown in FIGS. 4 and 5, the second flat mirror 25 is fixed to the mirror holder 49 with the reflection surface 25a facing up. The mirror holder 49 is provided with screw holes 49a at the left and right edges as rotation centers when adjusting the tilt, and a rotation center line 50 connecting the centers of the two screw holes 49a is formed on the reflection surface 25a. The second flat mirror 25 is positioned and fixed to the mirror holder 49 so as to be positioned at the position. The mirror holder 49 to which the second plane mirror 25 is fixed is inserted into the base member 48, and stepped rings 53 and 54 into which the screws 51 and 52 are inserted are shaft holes (not shown) provided in the base member 48. ) And the screws 51 and 52 are screwed into the screw holes 49a to temporarily fix the mirror holder 49 so as to be rotatable. The screws 51 and 52 adjust the inclination of the second flat mirror 25 after the LED 22, the display panel 21, the first flat mirror 26, and the concave mirror 27 are assembled and fixed to the base member 48. Then, the position of the second reflected light emitted from the second plane mirror 25 is adjusted, and then the cover member 29 is attached to complete the head-up display device 10.

  Although the display panel and the method for fixing the plurality of mirrors in the embodiment have not been particularly described, these optical members can be fixed by, for example, a pair of wall surfaces 33a and a wall surface 28a of the base member 28 as shown in FIG. Alternatively, the concave mirror 27 positioned in the above-described manner may be pressed by the wall surface 29 a of the cover member 29 to fix the four sides, or the display panel 21 may be fixed by the ribs 29 c provided on the cover member 29. Alternatively, when each member is positioned, a method of fixing with an adhesive may be used, or different methods may be used in combination.

  In the above embodiment, the mirror optical system is described as an example in which the mirror optical system is configured by two plane mirrors and one concave mirror. However, the configuration of the mirror is not limited to this, and for example, the first plane mirror 26 is not used. Alternatively, the second flat mirror 25 may be directly irradiated with the light emitted from the display panel 21. Moreover, although LED was used for the light source, it is not restricted to LED, You may use another well-known lamp etc.

  In the above-described embodiment, the automobile 12 is used as the moving body on which the head-up display device 10 is mounted. However, the moving body is not limited to a vehicle such as the automobile 12, but may be a flying body such as an airplane. Or a ship.

It is a schematic diagram of the driver's seat of the motor vehicle carrying the head up display apparatus which implemented this invention. It is a figure which shows the structure of a head-up display apparatus. It is a perspective view which shows the structure of the base member of a housing | casing. It is a perspective view which shows the structure of another base member which made the 2nd plane mirror adjustable. It is a figure which shows the structure of another embodiment.

Explanation of symbols

10 Head-up display device 12 Car (mobile)
13 Dashboard 15 Windshield 16 Driver (Crew)
18 Virtual Image 20 Case 21 Display Panel (Transmission Type Liquid Crystal Display Panel)
22 LED (light source device)
23 Image beam 24 Exit window 25 Second plane mirror 25a Reflecting surface 26 First plane mirror 27 Concave mirror 28, 48 Base member 29 Cover member 31 First plane mirror fixing part 32 Second plane mirror fixing part 33 Concave mirror fixing part 34 Light source housing part 35 Mounting part 36 to 39 Side wall 40 Panel fixing part 44 Tube part 49 Mirror holder 50 Center of rotation 51,52 Screw 53,54 Step ring

Claims (4)

An image displayed on a transmissive liquid crystal display panel is magnified by a plurality of mirrors, and the magnified image is reflected by a windshield of the moving object, so that a passenger of the moving object can visually recognize a virtual image of the image. In the head-up display device,
Comprising: the transmissive liquid crystal display panel; a light source device that irradiates light to the transmissive liquid crystal display panel from the back; the plurality of mirrors; and a housing that houses them.
The housing is
A light source container to which the light source device is fixed;
A panel fixing portion on which the transmissive liquid crystal display panel is positioned and fixed;
A plurality of mirror fixing portions on which the plurality of mirrors are respectively positioned and fixed;
A head-up display device characterized in that is integrally formed. A flat mirror having a reflecting surface for reflecting the image light emitted from the transmissive liquid crystal display panel in the vertical direction of the image is fixed to the housing, and is rotatably supported by the housing. Equipped with a mirror holder that can adjust the tilt of the reflecting surface of the mirror,
2. The head-up display device according to claim 1, wherein the plane mirror is positioned on the mirror holder so that a rotation center line of the mirror holder is located on the reflection surface.   3. The head-up according to claim 2, wherein the plane mirror reflects incident image light toward the concave mirror and re-reflects the image light reflected by the concave mirror toward the windshield. Display device. The light source accommodating portion is composed of an attachment portion to which the light source device is attached, and a tubular portion formed in a cylindrical shape by a plurality of side walls erected on the attachment portion,
The transmissive liquid crystal display panel is closely attached and fixed to the panel fixing portion formed on the end surface of the cylindrical portion, and the light emitted from the light source device is between the panel fixing portion and the transmissive liquid crystal display panel. 4. The head-up display device according to claim 1, wherein the head-up display device is configured not to leak to the flat mirror side.

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