JP2017187528A - Head-up display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head-up display device capable of easily controlling external light made incident on an enlargement unit.SOLUTION: The head-up display device includes a projection unit 11 and an enlargement unit 12. The projection unit 11 includes a projector. The enlargement unit 12 includes a second concave mirror and a second outer package incorporating the second concave mirror. The second outer package includes a first opening 12b through which video light L projected from the projection unit 11 passes and a second opening 12c through which the video light L after being reflected by the second concave mirror passes. The video light L after being emitted from the second opening 12c is reflected by a front glass 2 and a video generated by the projector is presented to a viewer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a head-up display device.

  Patent Documents 1 and 2 disclose a head up display (HUD) device for a vehicle. The display device described in Patent Document 1 includes a projector disposed on the ceiling of a vehicle, a first aspherical mirror disposed on the ceiling of the vehicle, and a second disposed on a dashboard (instrument panel) of the vehicle. It consists of an aspherical mirror. The display device described in Patent Document 1 displays an image to the driver by reflecting the image light projected by the projector in the order of the first aspherical mirror, the second aspherical mirror, and the windshield. Further, the image reproducing device described in Patent Document 2 uses a convex lens instead of the first aspherical mirror.

Special Table 2003-517971 Japanese Patent Laid-Open No. 01-208237

  However, in the display device described in Patent Document 1, the image light from the first aspherical mirror is incident on the second aspherical mirror through one opening provided in the instrument panel, and is further reflected by the second aspherical mirror. The later image light is emitted toward the windshield. The image reproducing device described in Patent Document 2 uses a convex lens instead of the first aspherical mirror to form an intermediate image and prevent an increase in size. However, even in Patent Document 2, there is one opening provided in the instrument panel, and image light is incident on an optical element such as a collimator and emitted from the optical element through one opening. . Here, in the magnifying unit that magnifies and emits image light toward the windshield, it is conceivable to cover the opening with a transparent cover in order to prevent foreign matter from entering the magnifying unit. However, when external light such as sunlight is incident on the opening of the enlargement unit, the external light is reflected through the optical element or the transparent cover and is incident on the projection unit that projects the image light. There is a problem in that the visibility of the video is impaired by reaching the driver's viewpoint. However, when image light is incident and emitted through one opening, it is necessary to control the external light incident on the magnifying unit while allowing both the incident and the output of the image light. The problem that it becomes difficult occurs.

  The present invention solves the above problems and provides a head-up display device capable of easily controlling external light incident on the magnification unit in a head-up display device in which the projection unit and the magnification unit are provided separately. Objective.

In order to achieve the above object, a head-up display device according to the present invention includes:
A head-up display device having a projection unit and an enlargement unit,
The projection unit is
It has a display that displays video and projects video light,
The expansion unit is
An optical element on which the image light projected from the projection unit is incident;
An exterior housing the optical element;
The optical element reflects or transmits the image light from the display, and the image generated by the display by the image light after the reflection or transmission is presented to the viewer.
The exterior has a first opening that allows the image light projected from the projection unit to pass therethrough, and a second opening that allows the image light after being reflected or transmitted through the optical element to pass through.
It is characterized by that.

  According to the present invention, it is possible to easily control external light incident on the enlargement unit.

1 is an overall configuration diagram of a head-up display device according to a first embodiment of the present invention. It is explanatory drawing which shows the internal structure of the projection unit of the head-up display apparatus shown in FIG. It is explanatory drawing which shows the internal structure of the expansion unit of the head-up display apparatus shown in FIG. It is explanatory drawing of prevention of a liquid pool of the head-up display apparatus shown in FIG. It is explanatory drawing which shows the function and optical path | route of the optical component which comprise the head up display apparatus shown in FIG. It is a figure which shows the expansion unit of the head-up display apparatus which concerns on the 2nd Embodiment of this invention.

  Hereinafter, a head-up display device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
As shown in FIG. 1, the head-up display device 1 according to the first embodiment of the present invention is a device that has a projection unit 11 and an enlargement unit 12 and projects an image on a windshield 2.

  The projection unit 11 is installed, for example, on the ceiling of the vehicle, and emits image light serving as a basis of an image visually recognized by the driver to the enlargement unit 12. The magnifying unit 12 is provided separately from the projection unit 11 and is installed, for example, in an instrument panel of the vehicle, and magnifies and projects the image light from the projection unit 11 onto the windshield 2.

  As shown in FIG. 2, the projection unit 11 includes a projector 11c, a screen 11d, a plane mirror 11e, a first concave mirror (correction mirror) 11f, and a first exterior 11a including an opening 11b.

  The projector 11c is an example of a display device, and includes a power source, a light source such as a light emitting diode (LED), a display element such as a transmissive liquid crystal, and a lens group. The projector 11c generates an image by irradiating the light of the light source onto the display element, and projects the image on the screen 11d through the lens group. A liquid crystal display or an organic EL (electro-luminescence) display may be used as the display.

  The screen 11d generates the image light L by diffusing the projection light of the projector 11c in a certain angle range, and is composed of, for example, a diffusion film made of polycarbonate.

  The plane mirror 11e reflects the generated image light L diffused by the screen 11d toward the first concave mirror 11f. The flat mirror 11e is formed, for example, by molding a polycarbonate resin and vacuum-depositing a metal such as aluminum.

  The first concave mirror 11f reflects the image light L reflected by the plane mirror 11e toward a second concave mirror 12d described later of the magnifying unit 12. That is, the first concave mirror 11f functions as a part of a relay optical system that transmits light. The first concave mirror 11f is formed, for example, by molding a polycarbonate resin and vacuum-depositing a metal such as aluminum.

  The first exterior 11a includes an opening 11b through which the image light L passes. The opening 11b is designed in a position, size, and shape so as not to block the image light L emitted from the first concave mirror 11f in the first exterior 11a. Further, the opening 11b is covered with a transparent cover (not shown) made of a material having transparency and strength, for example, a transparent polycarbonate plate, in order to prevent foreign matter from entering the projection unit 11. .

  As shown in FIG. 3, the magnifying unit 12 shown in FIG. 1 has a second concave mirror 12d and a second exterior 12a including a first opening 12b and a second opening 12c.

  The second concave mirror 12d is an example of an optical element. The image light L reflected by the first concave mirror 11f of the projection unit 11 is taken in and reflected from the first opening 12b, and is reflected from the second opening 12c. Projecting again toward the windshield 2. The second concave mirror 12d is configured, for example, by molding a polycarbonate resin and vacuum-depositing a metal such as aluminum.

  The second exterior 12a has a first opening 12b for allowing the image light L projected from the projection unit 11 to enter the second concave mirror 12d, and the image light L after being reflected by the second concave mirror 12d. 2nd opening part 12c for projecting to the windshield 2. The second exterior 12a is formed from, for example, a light-impermeable material. The first opening 12b is designed to have a position, size, and shape that allows the image light L projected from the projection unit 11 to pass through without being blocked and enter the second concave mirror 12d. The second opening 12c is designed to have a position, size, and shape that allows the image light L reflected by the second concave mirror 12d to pass through without being blocked and to be emitted toward the windshield 2. .

  A first transparent cover 12e made of a material having transparency and strength, for example, a transparent polycarbonate plate, is disposed in the first opening 12b in order to prevent foreign matter from entering the inside of the enlargement unit 12. Yes. A first louver film 12f is disposed on the surface of the first transparent cover 12e (the outer surface of the second exterior 12a) by bonding or the like. The first louver film 12f is provided so as to cover the first opening 12b, and transmits the image light L projected from the projection unit 11 and directed to the second concave mirror 12d, while going to the second concave mirror 12d. It functions as a first light control member that blocks light in a direction different from the image light L (external light E). Specifically, the first louver film 12f has a plurality of louver pieces (a plurality of louver pieces) spaced apart so as to have a predetermined angle with respect to the thickness direction of the first louver film 12f between the pair of transparent films. A light shielding portion). The louver pieces are designed to have an angle, a distance, a length, a thickness, and the like so as to pass the image light L toward the second concave mirror 12d without being blocked. More specifically, of the image light L and the external light E incident on the first opening 12b, the light incident at an angle larger than the first light transmission angle of the first louver film 12f determined by the louver piece. Is blocked by a louver piece. The surface of the first louver film 12f is preferably subjected to an anti-reflective (AR) treatment.

  Similarly to the first opening 12b, the second opening 12c is made of a material having transparency and strength, for example, a transparent polycarbonate plate, in order to prevent foreign matter from entering the inside of the enlargement unit 12. A second transparent cover 12g is arranged. A second louver film 12h is disposed on the surface of the second transparent cover 12g (the outer surface of the second exterior 12a) by bonding or the like. The second louver film 12h is provided so as to cover the second opening 12c, is reflected by the second concave mirror 12d and transmits the image light L directed toward the windshield 2, while the image light directed toward the windshield 2 It functions as a second light control member that blocks light in a direction different from L (external light E). Specifically, the second louver film 12h includes a plurality of louver pieces (a plurality of louver pieces arranged at intervals so as to have a predetermined angle with respect to the thickness direction of the second louver film 12h between the pair of transparent films. A light shielding portion). The louver pieces are designed with respect to angles, intervals, lengths, thicknesses, and the like so that the image light L traveling toward the windshield 2 can pass through without being blocked. More specifically, of the image light L and the external light E incident on the second opening 12c, the light incident at an angle larger than the second light transmission angle of the second louver film 12h determined by the louver piece. Is blocked by a louver piece. It is desirable that the surface of the second louver film 12h be subjected to antireflection treatment.

  In the embodiment of the present invention, as shown in FIG. 1, the expansion unit 12 is disposed in the back of the meter hood 3 as viewed from the driver. The meter hood 3 is disposed on the instrument panel surface of the vehicle in order to protect the vehicle meter and the like. In order to avoid reflection of the image light L and the external light E, the hood surface 3a for the enlargement unit 12 shown in FIG. 1 is formed of an antireflection material. The hood surface 3a is subjected to antireflection coating.

  As shown in FIG. 1, a space through which the image light L passes is provided in the vicinity of the first opening 12b. By providing the expansion unit 12 close to the meter hood 3, the space around the instrument panel can be used effectively. However, there is a possibility that water or other liquid may accumulate in the space for the image light L to pass due to rain blowing, condensation, drops of beverage, or the like, impairing the function of the vehicle or the head-up display device 1.

  A method for avoiding such a situation will be described with reference to FIG. As an example of liquid pool prevention, the enlargement unit 12 is provided with a notch 12i for discharging the liquid to the outside of the vehicle. The notch 12i is designed in a position, size and shape so that liquid does not stay in the enlargement unit 12. Further, the notch 12i is designed so that the liquid that has entered or generated inside is naturally discharged by acceleration / deceleration of the vehicle or the like, or is forcedly discharged by intake / exhaust by a fan. Furthermore, it is possible to prevent the liquid from staying in the meter hood 3 by providing the drainage hole 3 b and the notch 3 c in the meter hood 3 instead of the expansion unit 12.

As will be described later, the first concave mirror 11f, the second concave mirror 12d, and the second exterior 12a form a first intermediate image that is a real image between the first concave mirror 11f and the second concave mirror 12d. Designed based on experiments and so on. Further, the second concave mirror 12d is designed so that its focal point is in the second exterior 12a of the magnifying unit 12.
The first concave mirror 11f, the second concave mirror 12d, the magnifying unit 12 and the windshield 2 are designed so that the optical path formed by these is not obstructed by the driver or other obstacles.
Here, the detailed surface shapes of the first concave mirror 11f and the second concave mirror 12d are required for the positional relationship among the screen 11d, the plane mirror 11e, the windshield 2, and the eye box B, and the curvature of the windshield 2. The distortion of the display image is minimized under the constraint that the position of the display image does not change even when the driver's viewpoint P, which depends on data such as the display distance and the display angle of view, moves in the eye box B. For example, data such as the positional relationship among the screen 11d, the plane mirror 11e, the windshield 2, and the eye box B, the curvature of the windshield 2, the required display distance, the display angle of view, etc. are input to the optical design software Designed to minimize display image distortion.

  Next, with reference to FIG. 5, the positional relationship between the projection unit 11, the optical components constituting the enlargement unit 12, the windshield 2, the driver's viewpoint P, and the path of the image light L will be described.

  In order to facilitate understanding, the projector 11c, the screen 11d, and the plane mirror 11e are not shown in FIG. In FIG. 5, the direction and size of a real image or a virtual image in each optical path are, for example, directions of arrows indicating the image S, the first intermediate image M1, the second intermediate image M2, and the virtual image V on the screen, respectively. And indicated by length.

The projector 11c projects light on the screen 11d and generates an image S on the screen. The screen 11d is composed of a member that diffuses the projection light of the projector 11c within a certain angle range. Therefore, the image light L is emitted as scattered light from the image S on the screen 11d. The image light L is reflected and enlarged by the first concave mirror 11f, and forms an image as a first intermediate image M1.
The video light L formed as the first intermediate image M1 is further reflected and enlarged by the second concave mirror 12d, and is formed as the second intermediate image M2. The video light L formed as the second intermediate image M2 is finally reflected by the windshield 2 and observed as a virtual image V at the viewpoint P of the driver.

  According to the head-up display device 1 having the above configuration, the image light L is reflected by the first concave mirror 11f. Since the concave mirror has a property of concentrating incident light rays on the inner side, that is, on the optical axis, it can collect light efficiently. The image light L is reflected by the first concave mirror 11f, and forms a first intermediate image M1 between the first concave mirror 11f and the second concave mirror 12d. The first concave mirror 11f is a concave mirror that forms the first intermediate image M1, and can efficiently collect scattered light emitted from the screen 11d.

  Therefore, according to the head-up display device 1, the size of the first concave mirror 11f that receives the scattered light projected by the screen 11d can be reduced. Accordingly, the head-up display device 1 can be reduced in size, the limited space in the vehicle can be effectively used, and the degree of freedom of the arrangement of the projection units 11 constituting the head-up display device 1 can be achieved. Will also improve.

  The head-up display device 1 is configured as described above.

The head-up display device 1 of the present embodiment is a head-up display device having a projection unit 11 and an enlargement unit 12,
The projection unit 11
A projector 11c for displaying video and projecting video light L;
The enlargement unit 12 is
A second concave mirror 12d on which the image light L projected from the projection unit 11 enters;
A second exterior 12a containing the second concave mirror 12d,
The second concave mirror 12d reflects or transmits the image light L from the projector 11c, and the image generated by the projector 11c by the image light L after the reflection or transmission is presented to the viewer.
The second exterior 12a has a first opening 12b that allows the image light L projected from the projection unit 11 to pass therethrough and a second opening that allows the image light L after being reflected or transmitted through the second concave mirror 12d to pass therethrough. Part 12c.
According to this, the 1st opening part 12b for taking in the image light L projected from the projection unit 11 to the 2nd concave mirror 12d, and the video light L which reflected the 2nd concave mirror toward the windshield 2 By separately forming the second opening 12c for emission, the direction of the light to be transmitted is determined in one direction, so that the external light E incident on the enlargement unit 12 can be easily controlled.

The head-up display device 1 is provided so as to cover the first opening 12b, transmits the video light L projected from the projection unit 11, and blocks light in a direction different from the projected video light L. A first louver film 12f;
The second opening 12c is provided so as to cover the image light L after being reflected or transmitted through the second concave mirror 12d and blocking light in a direction different from that of the image light L after being reflected or transmitted. 2 louver films 12h.
According to this, most of the external light E that is about to enter the magnifying unit 12 can be easily blocked by the first and second louver films 12f and 12h.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned 1st Embodiment, or an equivalent part, and the detailed description is abbreviate | omitted.

  The head-up display device 1 according to the second embodiment includes the projection unit 11 and the enlargement unit 12 as in the first embodiment. However, as shown in FIG. 6, the second exterior of the enlargement unit 12 is provided. First and second openings 12b and 12c provided in 12a are formed so as to be curved in a concave shape when viewed from the outside, and first and second transparent covers 12e and 12g are respectively formed in a concave first and second shapes. It differs in that it is formed to be curved so as to have second curved surfaces 12e1, 12g1. In the second embodiment, the first and second louver films 12f and 12h are not provided, but may be further provided. Further, the first and second transparent covers 12e and 12g may be curved without bending the first and second openings 12b and 12c.

  The first transparent cover 12e is provided so as to cover the first opening 12b. In the present embodiment, the first transparent cover 12e is curved so that the surface thereof becomes a concave first curved surface 12e1. The first curved surface 12e1 reflects at least a part of the incident external light E in a first direction (for example, a direction toward the instrument panel). The second transparent cover 12g is provided so as to cover the second opening 12c. In the present embodiment, the second transparent cover 12g is curved so that the surface becomes a concave second curved surface 12g1. The second curved surface 12g1 reflects at least a part of the incident external light E in a second direction (for example, a direction toward the meter hood 3) different from the first direction. The member to which the reflected external light E travels is preferably subjected to antireflection treatment by painting or the like and has high heat resistance.

As described above, the head-up display device 1 according to the second embodiment is provided so as to cover the first opening 12b, and reflects at least part of the incident external light E toward the first direction. A first transparent cover 12e having a first curved surface 12e1,
A second transparent member is provided so as to cover the second opening 12c and has a second curved surface 12g1 that reflects at least a part of the incident external light E toward a second direction different from the first direction. And a cover 12g.
According to this, the external light E is projected on the first and second curved surfaces 12e1 and 12g1, respectively, while preventing foreign matter from entering the enlargement unit 12 through the first and second openings 12b and 12c. 11 and the outside light E can be easily controlled to be reflected in directions other than the viewpoint P of the driver.

  In addition, this invention is not limited by the above embodiment and drawing. Changes (including deletion of components) can be made as appropriate without departing from the scope of the present invention.

  In the above description of the embodiment, the head-up display device 1 for a vehicle has been described. However, according to the present invention, since there is a degree of freedom in the arrangement of the projection unit 11, the enlargement unit 12, and the glass, It can also be applied to applications such as aircraft and ships.

  Here, the head-up display device 1 according to the embodiment of the present invention typically reflects the image light L on the windshield 2 of the vehicle and presents the image to the driver. From the flexibility of the arrangement of 12, the image light L can be reflected on a reflecting member (referred to as a combiner) other than the windshield 2 of the vehicle, or an image can be presented to a person other than the driver.

In addition, one or both of the first concave mirror 11f and the second concave mirror 12d can be replaced with another optical element having a positive focal length, for example, a convex lens.
When a convex lens is used, unlike when a concave mirror is used, light is not reflected but transmitted. Therefore, for example, when the first concave mirror 11f is replaced with a convex lens, the convex lens is used so that the image light L transmitted through the convex lens forms a first intermediate image M1 and is reflected by the second concave mirror 12d. The positional relationship between the plane mirror 11e and the second concave mirror 12d is determined. When the second concave mirror 12d is replaced with a convex lens, a plane mirror that reflects the image light L (bends the optical path) is further provided between the convex lens and the windshield 2, and the image light transmitted through the convex lens. The positional relationship between the convex lens, the plane mirror, and the windshield 2 is determined so that L is reflected by the plane mirror and the windshield 2 and reaches the driver.

DESCRIPTION OF SYMBOLS 1 Head-up display apparatus 11 Projection unit 11a 1st exterior 11b Opening part 11c Projector 11d Screen 11e Plane mirror 11f 1st concave mirror (correction mirror)
12 Magnification unit 12a 2nd exterior 12b 1st opening part 12c 2nd opening part 12d 2nd concave mirror 12e 1st transparent cover 12e1 1st curved surface 12f 1st louver film (1st light control member)
12g Second transparent cover 12g1 Second curved surface 12h Second louver film (second light control member)
12i Notch 2 Front glass 3 Meter hood 3a Hood surface 3b Drain hole 3c Notch B Eye box E External light L Video light M1 First intermediate image M2 Second intermediate image P Driver's viewpoint S Image on screen V virtual image

Claims (6)

A head-up display device having a projection unit and an enlargement unit,
The projection unit is
It has a display that displays video and projects video light,
The expansion unit is
An optical element on which the image light projected from the projection unit is incident;
An exterior housing the optical element;
The optical element reflects or transmits the image light from the display, and the image generated by the display by the image light after the reflection or transmission is presented to the viewer.
The exterior has a first opening that allows the image light projected from the projection unit to pass therethrough, and a second opening that allows the image light after being reflected or transmitted through the optical element to pass through.
A head-up display device. A first light control member that is provided so as to cover the first opening, transmits the image light projected from the projection unit, and blocks light in a direction different from the projected image light;
Second light control provided so as to cover the second opening, transmits image light after being reflected or transmitted through the optical element, and blocks light in a direction different from the image light after being reflected or transmitted. A member,
The head-up display device according to claim 1. A first transparent cover having a first curved surface provided so as to cover the first opening and reflecting at least a part of incident light in a first direction;
A second transparent cover that is provided so as to cover the second opening and has a second curved surface that reflects at least part of incident light toward a second direction different from the first direction; Having
The head-up display device according to claim 1, wherein the head-up display device is a head-up display device. The image light after exiting from the second opening is further reflected by the reflecting member, and the image generated by the display is presented to the viewer.
The head-up display device according to claim 1, wherein the head-up display device is a head-up display device. The reflecting member is a windshield of an automobile, and the viewer is a driver of the automobile.
The head-up display device according to claim 4. The enlargement unit is provided in an instrument panel of an automobile, and the projection unit is provided outside the instrument panel.
The head-up display device according to claim 1, wherein the head-up display device is a head-up display device.

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