Coaxial double-focal-plane HUD optical system

Abstract

The utility model discloses a coaxial double-focal-plane HUD optical system. The coaxial double-focal-plane HUD optical system comprises an image source, an eye box, a prism, a first reflecting mirror, a second reflecting mirror and an automobile windshield, the prism, the first reflecting mirror and the second reflecting mirror are all arranged on a light path of the image source, the first reflecting mirror is used for carrying out first reflection on light rays emitted by the prism, and the second reflecting mirror is used for carrying out second reflection on the light rays reflected by the first reflecting mirror; the automobile windshield is used for reflecting the light reflected by the second reflector to the eye box. The image source is divided into two parts, the prism, the first reflecting mirror and the second reflecting mirror are arranged on the light path of the image source, a near-focus virtual image and a far-focus virtual image are formed at the position in front of the windshield, and a driver can be ensured to have a good visual effect under the condition that the visual field of the driver is poor such as car following or traffic jam through switching of the far-focus face and the near-focus face. And the virtual image surface can be seen, and the driving information of the vehicle can be obtained in time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the head-up display technical field, concretely relates to a coaxial double focal plane HUD optical system. BACKGROUND

[0002] With the development of science and technology, head-up display systems are increasingly used on vehicles. The head-up display system on the vehicle can display important driving information, such as speed, engine revolutions, fuel consumption, tire pressure, navigation, and information of an external smart device, in the driver's field of view on the front windshield in real time, so that the driver can see the driving information without lowering his head, thereby avoiding distraction from the road ahead. At the same time, the driver does not have to adjust his eyes between observing the road in the distance and the instruments nearby, which can avoid eye fatigue and greatly enhance driving safety and improve the driving experience.

[0003] The existing conventional head-up display has the characteristics of large FOV and high imaging quality, and basically only has one far focal plane for displaying information. Due to the relatively long virtual image distance, when the vehicle is stuck in traffic or following another vehicle, the front vehicle blocks the virtual image, which is mapped to the inside of the front vehicle, making it difficult for the driver to see the virtual image information and understand the current state of the vehicle. SUMMARY

[0004] (1) Technical problem to be solved

[0005] In view of the deficiencies of the prior art, the purpose of the present utility model is to provide a coaxial double focal plane HUD optical system, which aims to solve the problem that the existing head-up display is blocked by the front vehicle when the vehicle is stuck in traffic or following another vehicle, the virtual image is mapped to the inside of the front vehicle, making it difficult for the driver to see the virtual image information and understand the current state of the vehicle.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the utility model provides a coaxial double focal plane HUD optical system, which comprises an image source, an eyebox, a prism, a first mirror, a second mirror and a vehicle windshield. The image source is used to output the displayed image, and the eyebox is used to receive the image output by the image source. The prism, the first mirror and the second mirror are all arranged on the light path of the image source. The first mirror is used to reflect the light emitted by the prism for the first time, and the second mirror is used to reflect the light reflected by the first mirror for the second time. The vehicle windshield is used to reflect the light reflected by the second mirror to the eyebox. The image source comprises a first output part and a second output part. After passing through the prism, the first output part and the second output part synthesize a bundle of light and make the eyebox obtain a near focal plane and a far focal plane.

[0008] Preferably, the prism is composed of a first optical surface, a second optical surface, a third optical surface, a fourth optical surface and a fifth optical surface, and the fourth optical surface is located inside the prism.

[0009] Further, the first optical surface, the second optical surface, the third optical surface, the fourth optical surface and the fifth optical surface are a combination of free curved surfaces and planes.

[0010] Still further, the second optical surface is a total reflection surface.

[0011] Still further, the first optical surface and the fifth optical surface are located in the same plane.

[0012] Still further, the first mirror and the second mirror are a combination of free curved mirrors and free curved mirrors.

[0013] Still further, the first mirror and the second mirror are a combination of plane mirrors and free curved mirrors.

[0014] Advantages

[0015] Compared with the prior art, the present application has the following advantages:

[0016] In the present application, the image source is divided into two parts, and a prism, a first mirror and a second mirror are arranged on the light path of the image source. After the light of the image source is reflected by the automobile windshield, it enters the eyes of the driver, and forms a virtual image with near focus and far focus at the position in front of the windshield. The near focus and far focus surfaces are displayed simultaneously. The driver can switch between the near focus and far focus surfaces, so that the driver can see the virtual image surface even in the case of poor visibility such as following a car or being stuck in traffic, and can obtain the driving information of the vehicle in time. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the light path of the present application.

[0018] Figure 2 is a schematic diagram of the reflected light path of the prism of the present application.

[0019] Figure 3 is a schematic diagram of the prism of the present application.

[0020] Figure 4 is a schematic diagram of the image source of the present application.

[0021] The marks in the drawings are: 1, image source; 2, eye box; 3, prism; 4, first mirror; 5, second mirror; 6, automobile windshield; 101, first output part; 102, second output part; 103, near focus surface; 104, far focus surface; 301, first optical surface; 302, second optical surface; 303, third optical surface; 304, fourth optical surface; 305, fifth optical surface. DETAILED DESCRIPTION

[0022] The present embodiment is a coaxial double focal plane HUD optical system, as shown in the figure, including an image source 1 and an eyebox 2, the image source 1 is used to output the displayed image, and the eyebox 2 is used to receive the image output by the image source 1. Figures 1-4

[0023] A prism 3, a first mirror 4, a second mirror 5 and an automobile windshield 6, the prism 3, the first mirror 4 and the second mirror 5 are all arranged on the light path of the image source 1, the first mirror 4 is used to reflect the light emitted by the prism 3 for the first time, the second mirror 5 is used to reflect the light reflected by the first mirror 4 for the second time, and the automobile windshield 6 is used to reflect the light reflected by the second mirror 5 to the eyebox 2.

[0024] The image source 1 includes a first output part 101 and a second output part 102, the first output part 101 and the second output part 102 can display some information such as navigation and some basic information such as display of power or oil, and the first output part 101 and the second output part 102 synthesize a bundle of light after passing through the prism 3 and make the eyebox 2 obtain a near focal plane 103 and a far focal plane 104.

[0025] The image source 1 is divided into two parts, the eyebox 2, i.e. the position where the driver's eyes are located, can see the information, and the first output part 101 and the second output part 102 are used to image at the positions of the near focal plane 103 and the far focal plane 104, respectively, such as the near focal plane 103 can be 3m, and the far focal plane 104 can be 10m, wherein the near focal distance and the far focal distance are not unique and need to be determined according to the design requirements.

[0026] As shown in the figure, in the present embodiment, the prism 3 is composed of a first optical surface 301, a second optical surface 302, a third optical surface 303, a fourth optical surface 304 and a fifth optical surface 305, the fourth optical surface 304 is located inside the prism 3, and the first optical surface 301, the second optical surface 302, the third optical surface 303, the fourth optical surface 304 and the fifth optical surface 305 are a combination of free curved surfaces and planes. Figure 1 Figure 2 The prism 3 is composed of five surfaces, each of which can be a free curved surface or a plane, depending on the scene used, and the figure shows a schematic diagram of a free curved prism 3.

[0027] As shown in the figure, in the present embodiment, the second optical surface 302 is a total reflection surface, the first optical surface 301 and the fifth optical surface 305 are located in the same plane, so that the light is totally reflected at the second optical surface 302, improving the energy utilization efficiency.

[0028] As shown in the figure, in the present embodiment, the second optical surface 302 is a total reflection surface, the first optical surface 301 and the fifth optical surface 305 are located in the same plane, so that the light is totally reflected at the second optical surface 302, improving the energy utilization efficiency. Figure 2 Figure 3 As shown in the figure, in the present embodiment, the second optical surface 302 is a total reflection surface, the first optical surface 301 and the fifth optical surface 305 are located in the same plane, so that the light is totally reflected at the second optical surface 302, improving the energy utilization efficiency.

[0029] ​​​In the embodiment, the first reflector 4 and the second reflector 5 are a combination of a free-form surface mirror and a free-form surface mirror.

[0030] As shown in the figure, in the embodiment, the first reflector 4 and the second reflector 5 are a combination of a free-form surface mirror and a free-form surface mirror. Figure 1

[0031] Working principle: when working, the light emitted by the second output part 102 of the image source 1 passes through the fifth optical surface 305, the fourth optical surface 304 and the third optical surface 303 in sequence and is emitted, the light emitted by the first output part 101 of the image source 1 passes through the first optical surface 301, the second optical surface 302, the fourth optical surface 304 and the third optical surface 303 in sequence and is emitted, wherein the light is totally reflected at the second optical surface 302, thereby improving the energy utilization efficiency, and the light emitted by the first output part 101, if vertically incident to the first optical surface 301, is also emitted vertically to the third optical surface 303, so as to ensure that the far focus surface light path is not dispersed, at this time, the light emitted by the first output part 101 and the second output part 102 of the image source 1 is emitted at the third optical surface 303 after passing through the free-form surface prism 3, and the two beams of light are combined into one beam of light after passing through the third optical surface 303, thereby ensuring that the near focus surface 103 and the far focus surface 104 meet the coaxial condition.

[0032] The meaning of coaxial is that a straight line connecting the centers of the two focus surfaces passes through the center of the eyebox 2, that is, the downward viewing angles of the two focus surfaces are consistent, the far focus surface 104 is used when the front field of view is wide, and some information such as navigation is displayed, the near focus surface 103 is used when following a car or being in a traffic jam, and some basic information such as power or oil is displayed, so that the driver can also know the state information of the car at any time when following a car or being in a traffic jam.

[0033] All the technical features in the embodiment can be freely combined according to actual needs.

[0034] The above embodiment is a preferred implementation scheme of the utility model, in addition, the utility model can be realized in other ways, and any obvious replacement without departing from the technical scheme concept is within the protection scope of the utility model.​

Claims

1. A coaxial dual focal plane HUD optical system characterized in that, The application relates to a kind of image source (1) and eye box (2), the image source (1) is used to output the image shown, the eye box (2) is used to receive the image output by the image source (1); Prism (3), first mirror (4), second mirror (5) and automobile windshield (6), the prism (3), first mirror (4) and second mirror (5) are all arranged on the light path of the image source (1), the first mirror (4) is used to reflect the light emitted by the prism (3) for the first time, the second mirror (5) is used to reflect the light reflected by the first mirror (4) for the second time, and the automobile windshield (6) is used to reflect the light reflected by the second mirror (5) to the eye box (2); The image source (1) comprises a first output part (101) and a second output part (102), and the first output part (101) and the second output part (102) synthesize a light beam after passing through the prism (3) and make the eye box (2) obtain a near focus surface (103) and a far focus surface (104). The prism (3) is composed of a first optical surface (301), a second optical surface (302), a third optical surface (303), a fourth optical surface (304) and a fifth optical surface (305), and the fourth optical surface (304) is located in the interior of the prism (3).

2. The coaxial dual focal plane HUD optical system of claim 1, wherein, The first optical surface (301), the second optical surface (302), the third optical surface (303), the fourth optical surface (304) and the fifth optical surface (305) are a combination of free curved surfaces and planes.

3. The coaxial dual focal plane HUD optical system of claim 2, wherein, The second optical surface (302) is a total reflection surface.

4. The coaxial dual focal plane HUD optical system of claim 3, wherein, The first optical surface (301) and the fifth optical surface (305) are located in the same plane.

5. The coaxial dual focal plane HUD optical system of claim 4, wherein, The first mirror (4) and the second mirror (5) are a combination of free curved mirrors and free curved mirrors.

6. The coaxial dual focal plane HUD optical system of claim 5, wherein, The first mirror (4) and the second mirror (5) are a combination of plane mirrors and free curved mirrors.

7. The coaxial dual focal plane HUD optical system of claim 5, wherein, ​

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