JP2017026951A - Head-up display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head-up display device capable of adjusting a focal point deviated by a component dimensional error or the like.SOLUTION: A head-up display device (10) comprises a projector (31) for projecting an image, a reflection mirror (60) for reflecting light emitted from the projector (31) and a screen (41) through which light reflected by the reflection mirror (60) penetrates. The reflection mirror (60) is provided on an optical path length adjusting mechanism (65) which can adjust length of an optical path from the projector (31) to the screen (41).SELECTED DRAWING: Figure 4

Description

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

  There is a so-called head-up display device that displays various types of information on a windshield of a vehicle or the like and makes the displayed information visible together with the surrounding background. For example, there is a technique disclosed in Patent Document 1 as a conventional technique related to a head-up display device.

  The head-up display device disclosed in Patent Document 1 includes a first screen that displays a first image, a second screen that displays a second image, and a half mirror that transmits light and reflects light. The half mirror transmits the first image and reflects the second image. The first image and the second image are projected onto the windshield in a superimposed state. The passenger can visually recognize an image displayed as a virtual image in front of the windshield.

  Here, the images displayed on the first and second screens are projected by, for example, a projector. In this case, it is necessary to form an image at a position where the screen is arranged. That is, it is necessary to adjust the focus of the image emitted from the projector to the position of the screen. However, slight variations occur in the dimensions of parts that are actually manufactured and the positions where the parts are attached. As a result, even when assembled using parts manufactured within a predetermined tolerance range, the screen may be slightly out of focus.

Japanese Patent Laid-Open No. 2003-237712

  An object of the present invention is to provide a head-up display device capable of adjusting a focus shifted due to a dimensional error of a component.

According to the first aspect of the present invention, a head having a projector for emitting an image, a reflecting mirror for reflecting the light emitted from the projector, and a screen for transmitting the light reflected by the reflecting mirror. In the up display device,
The reflection mirror is provided on an optical path length adjusting mechanism capable of adjusting an optical path length from the projector to the screen, and a head-up display device is provided.

As described in claim 2, preferably, the surface of the reflecting mirror is a curved surface,
The optical path length adjusting mechanism moves the reflecting mirror along the optical axis of light incident on the reflecting mirror.

As described in claim 3, preferably, one projector is provided,
At least two reflectors are provided,
The light emitted from the projector is reflected toward the screen by the respective reflecting mirrors.

As described in claim 4, preferably, the projector includes a focus adjustment mechanism capable of adjusting a focus position, and one projector is provided.
In addition to the reflecting mirror, one fixed reflecting mirror is provided that reflects light other than the light reflected by the reflecting mirror out of the light emitted from the projector, the length of the optical path being not adjustable. ing.

  In the invention which concerns on Claim 1, the reflective mirror which reflects the light radiate | emitted from the projector is provided on the optical path length adjustment mechanism which can adjust the optical path length from a projector to a screen. That is, the position of the reflecting mirror can be corrected by the optical path adjusting mechanism.

  Therefore, the optical path length from the projector to the screen can be adjusted by correcting the position of the reflector after the projector, the reflector, and the screen are arranged. As a result, even when the actual optical path length is different from the designed optical path length due to variations in component dimensions and component mounting positions, it is possible to focus on the screen by correcting the position of the reflecting mirror.

  In the invention which concerns on Claim 2, the surface of a reflective mirror is a curved surface, and an optical path length adjustment mechanism moves a reflective mirror along the optical axis of the light which injects into a reflective mirror. That is, the reflecting mirror can move in parallel with the optical axis of the light incident on the reflecting mirror. Therefore, the incident angle of the light incident on the reflecting mirror is the same before and after the movement.

  If the reflecting mirror is moved in a direction other than parallel to the optical axis, the incident angle of light changes before and after the movement. By changing the reflection angle of the light, the direction of the reflected light changes, so that the position at which the image is projected may be greatly shifted. On the other hand, when the reflecting mirror on the curved surface is moved in parallel, the length of the optical path can be changed without changing the direction of the reflected light.

  In the invention according to claim 3, one projector is provided, at least two reflectors are provided, and the light emitted from the projector is reflected toward the screen by the respective reflectors.

  Since each reflecting mirror is separately provided on the optical path length adjusting mechanism, the optical path length of each light can be adjusted. As a result, each individual screen can be focused.

  In the invention according to claim 4, the projector includes a focus adjustment mechanism capable of adjusting the focal position, and one projector is provided. In addition to the reflecting mirror, the optical path length cannot be adjusted, and the projector is emitted from the projector. One fixed reflecting mirror that reflects light other than the light reflected by the reflecting mirror is provided.

  Therefore, the focal position of the fixed reflecting mirror can be adjusted by a focus adjustment mechanism provided in the projector. On the other hand, the focal positions of the other reflecting mirrors can be adjusted by the optical path adjusting mechanism. In other words, the fixed reflecting mirror can be adjusted in focus by the focus adjustment mechanism provided in the projector, and therefore there is no need to provide an optical path adjustment mechanism. By using conventional parts, the number of optical path adjustment mechanisms can be reduced. As a result, a head-up display can be manufactured at a reduced cost.

It is sectional drawing of the head-up display apparatus by Example 1 of this invention. It is a figure explaining the optical path of the head-up display apparatus shown by FIG. FIG. 3 is a perspective view of a reflecting mirror provided on the optical path length adjusting mechanism shown in FIG. 2. It is an effect | action figure of the reflecting mirror shown by FIG. It is a figure explaining the reflection angle and incident angle of light when the reflecting mirror shown in FIG. 3 is moved in the vertical direction. It is a figure which compares the incident angle and reflection angle of light about the reflecting mirror shown by FIG. It is an effect | action figure of the head-up display apparatus by Example 2 of this invention. It is an effect | action figure of the head-up display apparatus by Example 3 of this invention.

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 with reference to the occupant of the vehicle on which the head-up display device is mounted, and front and rear refer to the front and rear with reference to the traveling direction of the vehicle. In the figure, Fr is front, Rr is rear, L is left when viewed from the occupant, R is right when viewed from the occupant, Up is upper, and Dn is lower.
<Example 1>

  Please refer to FIG. FIG. 1 shows a head-up display device 10 mounted on a vehicle Ve. The head-up display device 10 includes a projection unit 30 that projects an image inside the housing 20, a first screen 41 and a second screen 42 that display an image projected from the projection unit 30, the first screen 41, and the like. The reflection part 50 which reflects the light which displays the image displayed on the 2nd screen 42 toward the windshield 19 is provided.

  The housing 20 is made of a light shielding synthetic resin and has a box shape. The housing 20 is formed by covering the lower housing 20a with the upper housing 20b.

  The lower housing 20b includes a bottom surface portion 21, lower side surface portions 22 and 22 raised from the side portion of the bottom surface portion 21 (only one lower side surface portion 22 is shown), It consists of a lower front surface portion 23 that connects the front ends of the side surface portions 22 and 22, and a lower rear surface portion 24 that connects the rear ends of the lower side surface portions 22 and 22.

  The upper housing 20b includes upper side surface portions 25, 25 (only one upper side surface portion 25 is shown) overlaid on the lower side surface portions 22, 22, and the front ends of these upper side surface portions 25, 25. An upper front surface portion 26 that connects, an upper rear surface portion 27 that connects the front ends of the upper side surface portions 25 and 25, a ceiling portion 28 that covers the upper side surface portions 25 and 25, the upper front surface portion 26, and the upper rear surface portion 27; Consists of. The opening formed in the ceiling portion 28 is covered with a cover 29 that transmits light reflected from the reflecting portion 50.

  The projection unit 30 includes a projector 31 fixed to the bottom surface portion 21, a projection control unit 32 that controls the projector 31, a projection mirror 33 inserted into the stay 12 fixed to the bottom surface portion 21, and a bottom surface portion. The first reflector 60 (reflecting mirror 60) and the second reflector 70 (reflecting mirror 70) provided in the step portion 13 fixed to 21 and the first reflector 60 and the second reflector 70 are controlled. A reflection control unit 34.

  The projector 31 includes, for example, a light source that emits light, a DMD (Digital MicroMirror Device) that is a reflective display element that displays an image, and a lens. Detailed description is omitted. The projector 31 may use LCOS (registered trademark: Liquid Crystal On Silicon) as a display element or a TFT (Thin Film Transistor) liquid crystal panel which is a transmissive display element.

  The projection mirror 33 is formed, for example, by depositing a reflective film on the surface of a synthetic resin base material. A plurality of projection mirrors 33 may be provided or eliminated in the optical path from the projector 31 to the first screen 41 and the second screen 42.

  The first reflector 60 is provided on a first rack and pinion mechanism 65 (optical path length adjusting mechanism 65) that can adjust the optical path length from the projector 31 to the first screen 41. Details will be described later. Similarly, the second reflector 70 is also provided on a second rack and pinion mechanism 75 (optical path length adjusting mechanism 75) that can adjust the optical path length from the projector 31 to the second screen 42.

  The reflection control unit 34 includes a power source 35, a controller 36 that controls the first rack and pinion mechanism 65 and the second rack and pinion mechanism 75, and a switch 37 that switches a control target by the controller 36.

  Both the first screen 41 and the second screen 42 are transmissive screens configured by, for example, a holographic diffuser, a microlens array, a diffusion plate, and the like. The first screen 41 and the second screen 42 are supported by stays 14 and 14 fixed to the upper side surface portion 25, respectively.

  The reflecting portion 50 includes an upper reflector 51 provided on the ceiling portion 28 of the upper housing 20 b and a lower reflector 52 provided on the lower side surface portion 22.

  The upper reflector 51 is formed, for example, by depositing a reflective film on the surface of a synthetic resin base material. The upper reflector 51 is inserted into the stay 15 fixed to the ceiling portion 28.

  The lower reflector 52 is formed, for example, by depositing a reflective film on the surface of a synthetic resin base material. The reflection surface of the lower reflector 52 has a concave shape. The lower reflector 52 is swingably supported by the lower side surface portion 22 and is swung by a motor 53 provided on the lower side surface portion 22. A detailed description of the swing configuration is omitted.

  Please refer to FIG. The projector 31 emits light for displaying the first image P1 displayed on the first screen 41 and the second image P2 displayed on the second screen 42 based on the signal from the projection control unit 32. The projection mirror 33 reflects the light emitted from the projector 31 toward the first reflector 60 and the second reflector 70.

  The first reflector 60 and the second reflector 70 reflect the light reflected by the projection mirror 33 toward the first screen 41 and the second screen 42.

  The first screen 41 receives light for displaying the first image P1 on the back surface and displays the first image P1 on the surface. Similarly, the second screen 42 receives light for displaying the second image P2 on the back surface and displays the second image P2 on the surface.

  The upper reflector 51 reflects light that displays the first image P1 displayed on the first screen 41 and the first image P1 displayed on the second screen 42. The lower reflector 52 reflects the light reflected by the upper reflector 51 toward the windshield 19. The first image P1 and the second image P2 are projected on the windshield 19. The occupant can visually recognize the first virtual image V1 in which the first image P1 is enlarged and the second virtual image V2 in which the second image P2 is enlarged.

  Since the second screen 42 is tilted with respect to the optical axis of the light emitted from the projector 31 (the optical axis of the light reflected by the first reflector 60), the second virtual image V2 is tilted. Visible. Further, the reflecting surface of the lower reflector 52 has a concave shape. Therefore, the first image P1 and the second image P2 are enlarged, and distortion of the first virtual image V1 and the second virtual image V2 due to the windshield 19 being a curved surface is reduced.

  Furthermore, the length of the optical path from the second screen 42 to the windshield 19 is longer than the optical path from the first screen 41 to the windshield 19. Therefore, the occupant can visually recognize the second virtual image V2 so as to be located farther than the first virtual image V1.

  Please refer to FIG. The first reflector 60 includes a base 61 formed in a right triangular triangular prism shape, and a first reflector 62 provided on the inclined surface of the base 61. The first reflecting part 62 is formed by a convex mirror. This is because the imaging distance of the light incident on the first reflecting portion 62 is changed to be long and reflected toward the first screen 41. As a result, the first image P1 (see FIG. 2) is formed on the surface of the first screen 41.

  The first rack and pinion mechanism 65 includes a rack 66 attached to a lower portion of the first reflector 60 and a pinion 67 that moves the rack 66. The motor 68 that rotates the pinion 67 is controlled by the reflection control unit 34 (see FIG. 1).

  The optical path length adjusting mechanism may be, for example, a ball screw mechanism instead of the first rack and pinion mechanism 65.

  The first reflector 60 is supported by the slide support mechanism 54. The slide support mechanism 54 extends in the same direction as the direction in which the rack 66 extends.

  The slide support mechanism 54 includes left and right rails 55 and 55 provided on the left and right lower side surface portions 22 and 22 (only the right lower side surface portion is shown) of the lower housing 20a (see FIG. 1); The sliders 56 and 56 are attached to the left and right wall portions 63 and 63 of the first reflector 60 and slide on the left and right rails 55 and 55.

  The left slider 56 has an L shape, and a fixing portion 57 fixed to the wall portion 63 of the first reflector 60 and a sliding portion that extends horizontally from the upper end of the fixing portion 57 and slides on the rail 55. 58. The right slider 56 has a symmetrical structure with the left slider 56 with the first reflector 60 as the center. Description is omitted.

  Please refer to FIG. 1 and FIG. The second reflecting portion 72 serving as the reflecting surface of the second reflector 70 has a planar shape. Therefore, the light incident on the second reflecting portion 72 is reflected toward the second screen 42 without changing the imaging distance. Thereby, the second image P <b> 2 is formed on the surface of the second screen 42. Other configurations of the second reflector 70 are the same as those of the first reflector 60. The second rack and pinion mechanism 75 has the same configuration as the first rack and pinion mechanism 65. Detailed description of the second reflector 70 and the second rack and pinion mechanism 75 is omitted.

  Next, the operation and effect of the present invention will be described.

  Please refer to FIG. 2 and FIG. The first reflector 60 (reflecting mirror 60) is provided on a first rack and pinion mechanism 65 (optical path length adjusting mechanism) that can adjust the optical path length from the projector 31 to the first screen 41. That is, the position of the first reflector 60 can be corrected by the first rack and pinion mechanism 65. Therefore, after the projector 31, the first reflector 60, and the first screen 41 are arranged, the position of the first reflector 60 is corrected by using the controller 36 (see FIG. 1). The optical path length to the first screen 41 can be adjusted.

  For example, the adjustment of the optical path length when the actual optical path length becomes longer than the designed optical path length due to variations in component dimensions and component mounting positions will be described. In this case, when the first reflector 60 is moved forward, the first reflector 60 approaches the projection mirror 33. As the distance between the projection mirror 33 and the first reflector 60 is narrowed, it can be corrected to the designed optical path length. Thereby, the first screen 41 can be focused (imaged).

  As the first reflector 60 moves forward, the first image P1 displayed on the first screen 41 also moves forward, and the position of the first virtual image V1 projected by the head-up display device 10 also changes. A large change in the position of the first virtual image V1 can be dealt with by correcting the writing position of the display original image in the projector 31.

  Here, the first rack and pinion mechanism 65 moves the first reflector 60 along the optical axis of the light incident on the first reflector 60. That is, the first reflector 60 moves in parallel with the optical axis of the light incident on the first reflector 60. Hereinafter, the incident angle and reflection angle of light when the first reflector 60 is moved in a direction other than parallel to the optical axis, for example, in a direction perpendicular to the optical axis will be described.

  Please refer to FIG. FIG. 5A shows a reflecting surface 69 corresponding to the first reflecting portion 62 of the first reflector 60. FIG. 5B shows a case where the reflecting surface 69 is moved upward. FIG. 5C shows the case where the reflecting surface 69 is moved downward. The incident angle β shown in FIG. 5B and the incident angle γ shown in FIG. 5C are all different from the incident angle α shown in FIG. Therefore, the reflection angle of light is also different.

  Reference is made to FIG. When the first reflector 60 is moved upward, the incident angle a of the light after movement is smaller than the incident angle A of the light before movement. For this reason, the direction of the reflected light changes, and the position where the first image P1 is projected may be greatly shifted.

  Reference is made to FIG. On the other hand, when the first reflector 60 is moved in parallel as in the present invention, the incident angle B of the light incident on the first reflector 60 is the same before and after the movement. Since the direction of the reflected light does not change, the position where the first image P1 is projected does not deviate greatly.

  Note that the first reflecting portion 62 may have a concave shape instead of the convex shape. Further, the second reflector 70 (see FIG. 2) also has the same operation and effect as the first reflector 60. Description is omitted.

  Furthermore, when the reflector is moved along the optical axis of the light incident on the reflector, not only the incident angle of light does not change, but also the incident position of light does not change. For this reason, the configuration in which the reflector is moved along the optical axis of the light incident on the reflector is also suitable, for example, for a planar-shaped reflecting mirror in which a reflecting film is formed only in the light incident range.

<Example 2>
Next, a second embodiment of the present invention will be described. In Example 2, the number of reflectors and screens is different. About another structure, it is the same as that of the head-up display apparatus 10 of Example 1, and it abbreviate | omits description while omitting a code | symbol.

  Please refer to FIG. One projector 31 is provided. The reflector is provided with a third reflector 80 in addition to the first reflector 60 and the second reflector 70. The third reflector 82 of the third reflector 80 has a concave shape. The third reflector 80 is provided on the third rack and pinion mechanism 85.

  The light emitted from the projector 31 is reflected toward the first screen 41 to the third screen 43 by the first reflector 60 to the third reflector 80, respectively.

  Also in the head-up display device 10A, the predetermined effect of the present invention can be obtained. Furthermore, according to the head-up display device 10A, the following specific effects can be obtained by the above configuration.

  Since the first reflector 60 to the third reflector 80 are provided on the first rack and pinion mechanism 65 to the third rack and pinion mechanism 85, respectively, the optical path length of each light can be adjusted. . As a result, each of the first screen 41 to the third screen 43 can be focused.

  In addition, the length of the optical path from the third screen 43 to the windshield 19 is longer than the optical path from the second screen 42 to the windshield 19. Therefore, the third virtual image V3 on which the third image P3 displayed on the third screen is projected is formed at a position farther than the second virtual image V2. The second virtual image V2 is formed between the first virtual image V1 and the third virtual image V3. Therefore, as compared with Example 1, the perspective of the second virtual image V2 is enhanced by the presence of the third virtual image V3 that is imaged at a greater distance. The passenger can visually recognize the second virtual image V2 more three-dimensionally.

<Example 3>
Next, Embodiment 3 of the present invention will be described. In Example 3, the structure which supports a reflector differs. About another structure, it is the same as that of the head-up display apparatus 10 of Example 1, and it abbreviate | omits description while omitting a code | symbol.

  Please refer to FIG. The projector 31 includes a focus adjustment mechanism 39 that can adjust the focus position, and one projector is provided. Further, in addition to the first reflector 60, the optical path length cannot be adjusted, and the fourth light that reflects light other than the light reflected by the first reflector 60 among the light emitted from the projector 31 is reflected. One reflector 89 (fixed reflecting mirror 89) is provided in the step portion 13. The fourth reflector 89 is fixed to the stepped portion 13 by, for example, a screw and a bracket.

  Also in the head-up display device 10B, the predetermined effect of the present invention can be obtained. Furthermore, according to the head-up display device 10B, the following specific effects can be obtained by the above configuration.

  The focal position of the fourth reflector 89 can be adjusted by a focus adjustment mechanism 39 provided in the projector 31. On the other hand, the focal position of the first reflector 60 can be adjusted by the first rack and pinion mechanism 65. That is, the fourth reflector 89 can be adjusted in focus by the focus adjustment mechanism 39 provided in the projector 31, so that it is not necessary to provide a rack and pinion mechanism. By using conventional parts, the number of rack and pinion mechanisms in the projection unit can be reduced. As a result, the head-up display device 10B can be manufactured at a reduced cost.

  Note that the head-up display device according to the present invention is not limited to a two-wheeled vehicle or a four-wheeled vehicle, but can be applied to other vehicles, regular working machines, construction machines, and the like.

  The head-up display device of the present invention is suitable for mounting on a passenger car.

DESCRIPTION OF SYMBOLS 10 ... Head up display apparatus 31 ... Projector 41 ... 1st screen 42 ... 2nd screen 43 ... 3rd screen 54 ... Slide support mechanism 55 ... Rail 56 ... Slider 57 ... Fixed part 58 ... Sliding part 60 ... 1st reflection 61 ... Base 62 ... First reflector 70 ... Second reflector 75 ... Second rack and pinion 80 ... Third reflector 85 ... Third rack and pinion 89 ... Fourth reflector

Claims (4)

In a head-up display device having a projector for projecting an image, a reflecting mirror that reflects light emitted from the projector, and a screen that transmits light reflected by the reflecting mirror,
The head-up display device, wherein the reflecting mirror is provided on an optical path length adjusting mechanism capable of adjusting an optical path length from the projector to the screen. The surface of the reflecting mirror is a curved surface,
The head-up display device according to claim 1, wherein the optical path length adjusting mechanism moves the reflecting mirror along an optical axis of light incident on the reflecting mirror. One projector is provided,
At least two reflectors are provided,
The head-up display device according to claim 1, wherein the light emitted from the projector is reflected toward the screen by each of the reflecting mirrors. The projector includes a focus adjustment mechanism capable of adjusting a focus position, and one projector is provided.
In addition to the reflecting mirror, one fixed reflecting mirror is provided that reflects light other than the light reflected by the reflecting mirror out of the light emitted from the projector, the length of the optical path being not adjustable. The head-up display device according to claim 1, wherein the head-up display device is provided.

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