CN109425977B - Optical reflection module of head-up display - Google Patents

Optical reflection module of head-up display Download PDF

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Publication number
CN109425977B
CN109425977B CN201710733208.8A CN201710733208A CN109425977B CN 109425977 B CN109425977 B CN 109425977B CN 201710733208 A CN201710733208 A CN 201710733208A CN 109425977 B CN109425977 B CN 109425977B
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reflector
mirror
image light
curved
reflecting
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CN109425977A (en
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李柏彻
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Tan Clan Technology Co ltd
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Tan Clan Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features

Abstract

An optical reflection module of a head-up display for reflecting an image light generated by an image generator to an imaging portion to form an image on the imaging portion, comprising: a multi-reflecting mirror, a curved reflecting mirror, and a rear reflecting mirror; the multi-reflector reflects the image light to the curved-surface reflector, the curved-surface reflector reflects the image light to the multi-reflector, and the multi-reflector reflects the image light to the rear-end reflector.

Description

Optical reflection module of head-up display
Technical Field
The present invention relates to a head-up display, and more particularly, to an optical reflection module of a head-up display.
Background
The Head-Up Display (HUD) was the earliest on military aircraft, and its aim at let the pilot need not the low Head and look over the demonstration and the data of instrument, kept the gesture of raising the Head all the time, reduced between the low Head and the raising neglected the quick change of external environment and the delay and the discomfort that eye focus need constantly adjust the production.
With the advancement of technology, more and more vehicles are equipped with heads-up displays in recent years. The head-up display uses the principle of optical reflection to project some important information on a piece of glass in front of the pilot or the driver, so as to reduce the frequency of the pilot needing to look down at the instrument and avoid the attention interruption and the loss of control over the state awareness.
A typical head-up display includes two main architectures, an image processing system and an image display system. The image processing system converts the data to be displayed into the graphics or characters to be displayed and generates an image signal. The image display system projects the image signal on the glass. The conventional image display system includes a plurality of mirrors for reflecting the image signal onto the glass sheet.
In recent years, image display systems have a larger volume than image processing systems, and the mirrors in the image display systems are extra volume-occupying elements. In order to reduce the volume of the head-up display, the head-up display can be installed in a narrow space. It is very important to improve the image display system.
Disclosure of Invention
The present invention is directed to an optical reflection module of a head-up display, which has a small size and weight, so that the head-up display can be installed in a small space.
To achieve the above-mentioned objective, the optical reflection module of a head-up display according to the present invention is used for reflecting an image light generated by an image generator to an imaging portion, so as to form an image on the imaging portion, wherein the optical reflection module has a multi-mirror, and the image light is reflected by the multi-mirror at least twice.
Furthermore, the reflector of the optical reflection module further has a curved reflector; after the image light is reflected by the multiple reflector for the first time and before the image light is reflected by the multiple reflector for the second time, the image light is reflected by the curved reflector.
Furthermore, the curved reflector is a concave mirror with a radius of curvature of-1405.57781 mm to-376.973185 mm.
Furthermore, the multiple reflection mirror is a concave mirror, and the curved reflection mirror is a concave mirror.
Furthermore, the multi-reflecting mirror is a plane mirror, and the curved reflecting mirror is a concave mirror.
Furthermore, the reflector of the optical reflection module further has a front reflector; the image light is reflected by the front reflector and then reflected by the multi-reflector for the first time.
Furthermore, the front reflector is a concave mirror.
Furthermore, the central incident angle of the image light reflected by the multi-mirror for the first time is between 39.4 degrees and 50 degrees.
Preferably, the central incident angle of the image light reflected by the multi-mirror for the second time is between 19.4 degrees and 31 degrees.
Furthermore, the central incident angle of the image light reflected by the curved mirror is between 8.9 degrees and 10.2 degrees.
Furthermore, the front reflector reflects the image light with a central incident angle between 8.1 degrees and 12.8 degrees.
The present invention further provides an optical reflection module of a head-up display, comprising: a multi-reflecting mirror, a curved reflecting mirror, and a front reflecting mirror; the multi-reflector reflects the image light to the curved-surface reflector, the curved-surface reflector reflects the image light to the multi-reflector, and the multi-reflector reflects the image light to the rear-end reflector.
The optical reflection module of the head-up display can achieve the same optical effect by using a small number of reflectors and has the advantages of small volume, light weight, low cost and the like.
Drawings
FIG. 1 is a schematic diagram of a first preferred embodiment of the present invention.
FIG. 2 is a diagram illustrating a second preferred embodiment of the present invention.
FIG. 3 is a diagram illustrating a third preferred embodiment of the present invention.
FIG. 4 is a diagram illustrating a fourth preferred embodiment of the present invention.
FIG. 5 is a diagram illustrating a fifth preferred embodiment of the present invention.
Reference numerals
10: an image generator; 20: an imaging section; FM: a front end mirror; MM: a multiple-reflecting mirror; CM: a curved reflector; RM: a rear reflector.
Detailed Description
Referring to fig. 1, the optical reflection module of the head-up display according to the first preferred embodiment of the present invention has an object side and an image side, wherein an image generator 10 is disposed on the object side for generating an image light, and an imaging portion 20 is disposed on the image side for imaging the image light. The optical reflection module further includes a front reflector FM, a multi-reflector MM, a curved reflector CM, and a rear reflector RM. Wherein, the front reflector FM, the multiple reflector MM and the rear reflector RM are plane mirrors; the curved mirror CM is a concave mirror with a radius of curvature of-668.000000 mm.
After the image light is emitted from the image generator 10, the image light is reflected by the front reflector FM, the central incident angle is 18.1 degrees, then the multiple reflector MM sequentially reflects the image light for the first time, the central incident angle is 23.9 degrees, the curved reflector CM reflects the image light for the second time, the central incident angle is 10.2 degrees, and the multiple reflector MM reflects the image light for the second time, the central incident angle is 41 degrees, and finally the rear reflector RM reflects the image light to the imaging portion 20.
The optical profile of each of the mirrors of the first preferred embodiment is as set forth in table one:
watch 1
Reflecting surface Reflecting surface type Radius of curvature (mm) Central angle of incidence (degree)
Object Spherical surface Infinity -
Stop Spherical surface Infinity -
FM Spherical surface Infinity 18.1
MM Spherical surface Infinity 23.9
CM Aspherical surface -668.000000 10.2
MM Spherical surface Infinity 41
RM Spherical surface Infinity -
Image Spherical surface Infinity -
As can be seen from the above description, the image light is reflected twice by the multi-mirror MM during the transmission from the image generator 10 to the imaging part 20, so that the paths of the image light partially overlap between the multi-mirror MM and the curved mirror CM. Therefore, the number of the reflectors required by the optical reflection module can be reduced, and the volume of the optical reflection module is reduced, so that the optical reflection module has the characteristics of smaller volume, lighter weight, lower cost and the like.
Referring to fig. 2, the optical reflection module of the head-up display according to the second preferred embodiment of the present invention has an object side and an image side, wherein an image generator 10 is disposed at the object side for generating an image light, and an imaging portion 20 is disposed at the image side for imaging the image light. The optical reflection module further has a multi-mirror MM, a curved mirror CM, and a rear mirror RM. Wherein, the rear reflector RM and the multiple reflector MM are plane mirrors; the curved mirror CM is a concave mirror with a radius of curvature of-1405.57781 mm.
After the image light is emitted from the image generator 10, the image light is reflected by the multi-reflecting mirror MM sequentially for the first time, the central incident angle is 23.9 degrees, the curved-surface reflecting mirror CM is reflected, the central incident angle is 9.2 degrees, the multi-reflecting mirror MM is reflected for the second time, the central incident angle is 42.3 degrees, and finally the rear-end reflecting mirror RM reflects the image light to the imaging portion 20.
The optical profile of each of the mirrors of the second preferred embodiment is as set forth in table two:
watch two
Reflecting surface Reflecting surface type Radius of curvature (mm) Central angle of incidence (degree)
Object Spherical surface Infinity -
Stop Spherical surface Infinity -
MM Spherical surface Infinity 23.9
CM Spherical surface -1405.57781 9.2
MM Spherical surface Infinity 42.3
RM Spherical surface Infinity -
Image Spherical surface Infinity -
The optical reflection module of the second preferred embodiment has the same optical effects and characteristics as the first preferred embodiment, and will not be described herein again.
Referring to fig. 3, the optical reflection module of the head-up display according to the third preferred embodiment of the present invention has an object side and an image side, wherein an image generator 10 is disposed at the object side for generating an image light, and an imaging portion 20 is disposed at the image side for imaging the image light. The optical reflection module further has a multi-mirror MM, a curved mirror CM, and a rear mirror RM. Wherein, the rear end reflector RM is a plane mirror; the multiple reflection mirror MM is a concave mirror with a curvature radius of 78920.46726 MM; the curved mirror CM is a concave mirror with a radius of curvature of-376.973185 mm.
After the image light is emitted from the image generator 10, the image light is reflected by the multi-reflector MM sequentially for the first time, the central incident angle is 24.3 degrees, the curved reflector CM is reflected, the central incident angle is 8.9 degrees, the multi-reflector MM is reflected for the second time, the central incident angle is 42.6 degrees, and finally the rear reflector RM reflects the image light to the imaging part 20.
The optical properties of each of the mirrors of the third preferred embodiment are listed in table three:
watch III
Figure BDA0001387560410000041
Figure BDA0001387560410000051
In a third preferred embodiment, the sag (sag) of each curved mirror is calculated by the following equation:
Figure BDA0001387560410000052
wherein:
z is the degree of dishing of the mirror surface parallel to the z-axis;
c is the vertex Curvature (CUY);
k is a conic constant (conic constant); and
cj is xmynIs constant.
The parameters of the curved mirror of the third preferred embodiment, the multi-mirror MM and the curved mirror CM are listed in table four below:
watch four
Figure BDA0001387560410000053
The optical reflection module of the third preferred embodiment has the same optical effects and characteristics as those of the foregoing preferred embodiments, and will not be described herein again.
Referring to fig. 4, the optical reflection module of the head-up display according to the fourth preferred embodiment of the present invention has an object side and an image side, wherein an image generator 10 is disposed at the object side for generating an image light, and an imaging portion 20 is disposed at the image side for imaging the image light. The optical reflection module further has a multi-mirror MM, a curved mirror CM, and a rear mirror RM. Wherein, the rear reflector RM and the multiple reflector MM are plane mirrors; the curved mirror CM is a concave mirror with a radius of curvature of-520.000000 mm, respectively.
After the image light is emitted from the image generator 10, the multi-reflector MM sequentially reflects the image light to the imaging portion 20 for the first time, the central incident angle is 31 degrees, the curved reflector CM reflects the image light, the central incident angle is 9.5 degrees, the multi-reflector MM reflects the image light for the second time, the central incident angle is 50 degrees, and finally the rear reflector RM reflects the image light to the imaging portion 20.
The optical properties of each of the mirrors of the fourth preferred embodiment are set forth in table five:
watch five
Reflecting surface Reflecting surface type Radius of curvature (mm) Central angle of incidence (degree)
Object Spherical surface Infinity -
Stop Spherical surface Infinity -
MM Spherical surface Infinity 31
CM Spherical surface -520.000000 9.5
MM Spherical surface Infinity 50
RM Spherical surface Infinity -
Image Spherical surface Infinity -
The optical reflection module of the fourth preferred embodiment has the same optical effects and characteristics as those of the foregoing preferred embodiments, and will not be described herein again.
Referring to fig. 5, the optical reflection module of the head-up display according to the fifth preferred embodiment of the present invention has an object side and an image side, wherein an image generator 10 is disposed on the object side for generating an image light, and an imaging portion 20 is disposed on the image side for imaging the image light. The optical reflection module further includes a front reflector FM, a multi-reflector MM, a curved reflector CM, and a rear reflector RM. Wherein, the rear reflector RM and the multiple reflector MM are plane mirrors; the curved reflector CM is a concave mirror with a curvature radius of-1405.577881 mm; the front mirror FM is also a concave mirror with a radius of curvature of-884.664951 mm.
After the image light is emitted from the image generator 10, the image light is reflected by the front reflector FM, the central incident angle is 12.8 degrees, then the multiple reflectors MM sequentially perform the first reflection, the central incident angle is 19.4 degrees, the curved reflector CM performs the reflection, the central incident angle is 10 degrees, the multiple reflectors MM perform the second reflection, the central incident angle is 39.4 degrees, and finally the rear reflector RM performs the reflection, so that the image light is reflected to the imaging part 20.
The optical properties of each of the mirrors of the fifth preferred embodiment are set forth in Table six:
watch six
Reflecting surface Reflecting surface type Radius of curvature (mm) Central angle of incidence (degree)
Object Spherical surface Infinity -
Stop Spherical surface Infinity -
FM Spherical surface -884.664951 12.8
MM Spherical surface Infinity 19.4
CM Spherical surface -1405.57781 10
MM Spherical surface Infinity 39.4
RM Spherical surface Infinity -
Image Spherical surface Infinity -
The optical reflection module of the fifth preferred embodiment has the same optical effects and characteristics as those of the foregoing preferred embodiments, and will not be described herein again.
The present invention uses the multiple reflector MM to reflect the image light twice. Therefore, the number of the reflectors required by the optical reflection module can be reduced, and the volume of the optical reflection module is reduced, so that the optical reflection module has the characteristics of smaller volume, lighter weight, lower cost and the like.
The above examples are merely illustrative of the techniques and their efficacy and are not intended to limit the invention. It is to be appreciated that various changes in the above-described embodiments may be made by those skilled in the art without departing from the spirit and scope of the present invention, and therefore, it is intended that the appended claims cover all such modifications and changes as fall within the true spirit and scope of the invention.

Claims (9)

1. A head-up display, comprising:
an image generator for generating an image light;
an optical reflection module having a plurality of reflectors for reflecting the image light; and
an imaging part, which images the image light reflected by the reflector of the optical reflection module;
the method is characterized in that:
the optical reflection module comprises a multiple reflector, a curved reflector and a front reflector;
the image light is projected to the front end reflector to be reflected to the multi-reflector, then is reflected to the curved-surface reflector for the first time by the multi-reflector, and then is projected to the multi-reflector again by the curved-surface reflector to generate the second reflection;
wherein the content of the first and second substances,
the central incident angle of the front reflector reflecting the image light is between 8.1 and 12.8 degrees,
the central incident angle of the multi-mirror for reflecting the image light for the first time is between 19.4 degrees and 31 degrees,
the central incident angle of the image light reflected by the curved reflector is between 8.9 and 10.2 degrees,
the central incident angle of the image light reflected by the multi-reflecting mirror for the second time is between 39.4 and 50 degrees.
2. The head-up display of claim 1 wherein the curved mirror is a concave mirror having a radius of curvature of between-1405.57781 mm and-376.973185 mm.
3. The head-up display of claim 1 wherein the multi-reflecting mirror is a concave mirror and the curved reflecting mirror is a concave mirror.
4. The head-up display of claim 1 wherein the multi-reflecting mirror is a flat mirror and the curved reflecting mirror is a concave mirror.
5. The head-up display of claim 1 wherein the front reflector is a concave mirror.
6. An optical reflection module of a head-up display is used for reflecting an image light generated by an image generator to an imaging part to form an image on the imaging part, and is characterized by comprising: the reflecting mirror comprises a multi-reflecting mirror, a front end reflecting mirror and a curved surface reflecting mirror; after being reflected by the front end reflector, the image light is reflected by the multi-reflector for the first time, then the image light is projected to the curved reflector and is projected to the multi-reflector again to generate the second reflection;
wherein the content of the first and second substances,
the central incident angle of the front reflector reflecting the image light is between 8.1 and 12.8 degrees,
the central incident angle of the multi-mirror for reflecting the image light for the first time is between 19.4 degrees and 31 degrees,
the central incident angle of the image light reflected by the curved reflector is between 8.9 and 10.2 degrees,
the central incident angle of the image light reflected by the multi-reflecting mirror for the second time is between 39.4 and 50 degrees.
7. The optical reflection module of claim 6, wherein the curved mirror is a concave mirror with a radius of curvature of-1405.57781 mm to-376.973185 mm.
8. The optical reflection module of claim 6, wherein the multi-reflecting mirror is a concave mirror and the curved reflecting mirror is a concave mirror.
9. The optical reflection module of claim 6, wherein the multi-reflecting mirror is a flat mirror and the curved reflecting mirror is a concave mirror.
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