CN214067497U

CN214067497U - Projection optical system and head-up display device of automobile

Info

Publication number: CN214067497U
Application number: CN202023233358.9U
Authority: CN
Inventors: 朱炜湛; 唐晓峰; 丁明内; 杨伟樑; 高志强
Original assignee: Iview Displays Shenzhen Co Ltd
Current assignee: Iview Displays Shenzhen Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-08-27
Anticipated expiration: 2030-12-28

Abstract

The embodiment of the utility model relates to the technical field of projection optics, and discloses a projection optical system applied to a head-up display device of an automobile, which comprises an image generation unit, a first reflection unit, a light splitting device, a first lens, a second reflection unit and a second lens which are sequentially arranged according to a light emitting direction, and a controller connected with the image generation unit and the light splitting device and used for controlling the image emitted by the image generation unit and the light emitting of the light splitting device in a time-division sequence manner, the controller only controls the light emitting from the light reflecting side of the light splitting device when controlling the first image emitted by the image generation unit so as to enable the first image to be emitted and imaged through the first lens, and the controller only controls the light emitting from the light transmitting side of the light splitting device when controlling the second image emitted by the image generation unit so as to enable the second image to be emitted and imaged through the second lens, the projection optical system provided by the application can respectively realize different display contents and pictures at two different positions in a time-division sequence control manner, and has small volume and low cost.

Description

Projection optical system and head-up display device of automobile

Technical Field

The embodiment of the utility model provides a relate to projection optics technical field, in particular to new line display device of projection optical system and car.

Background

HUD indicates through car windshield formula new line display, and along with the intelligent development of car now, all the assembly has HUD in the novel intelligent automobile at present usually, and this makes the user need not to look over the panel board and just can observe vehicle information and road conditions information such as the speed of a motor vehicle, speed limit instruction, driving route map, and wherein AR HUD is the trend of HUD development at present, and AR HUD can show the new line display device of AR picture promptly.

In implementing the embodiments of the present invention, the inventor finds that there are at least the following problems in the above related art: at present, the HUD carried in the automobile, i.e. the head-up display device, usually can only display two-dimensional plane pictures, such as the driving information picture of the automobile, or, can only display AR pictures, such as the road condition information picture collected by the automobile camera, if two pictures need to be displayed simultaneously, two sets of head-up display devices need to be adopted to be able to realize, which leads to that enough space is left in advance in the front of the automobile body to be able to accommodate the HUD.

SUMMERY OF THE UTILITY MODEL

The embodiment of the present invention provides a projection optical system capable of realizing two kinds of image projection imaging and a head-up display device of an automobile.

The embodiment of the utility model provides an aim at is realized through following technical scheme:

in order to solve the above technical problem, in a first aspect, the embodiment of the present invention provides a projection optical system for a head-up display device of an automobile, the system includes:

an image generating unit for emitting a light beam containing image information of the first image and the second image;

the light incident side of the first reflection unit is arranged in the light emergent direction of the image generation unit;

the light incidence side of the light splitting device is arranged in the light emergence direction of the light reflection side of the first reflection unit;

the light incident side of the first lens is arranged in the light emergent direction of the light reflecting side of the light splitting device;

the light inlet side of the second reflection unit is arranged in the light outlet direction of the light transmitting side of the light splitting device;

the light incident side of the second lens is arranged in the light emergent direction of the light reflecting side of the second reflecting unit;

a controller connected to the image generating unit and the light splitting device respectively, for controlling the image emitted from the image generating unit and the light emitted from the light splitting device in a time-division sequence, wherein,

the controller is configured to control only the light emitting from the light reflecting side of the light splitting device when the image generating unit is controlled to emit the first image, so that the first image is emitted and imaged through the first lens,

the controller is configured to control only the light-transmitting side of the light splitting device to emit light when the image generation unit is controlled to emit the second image, so that the second image is emitted and imaged through the second lens.

In some embodiments, when the light splitting device is a half-reflecting and half-transmitting mirror,

the light splitting device is configured to effect reflection of the light beam of the first image when rotated to a first angle,

the beam splitting device is configured to effect transmission of the light beam of the second image when rotated to a second angle,

the projection optical system further includes:

and the first driving device is respectively connected with the controller and the light splitting device and is used for driving the light splitting device to rotate according to a control instruction sent by the controller.

In some embodiments, when the light-splitting device is a mirror,

the light splitting device is configured to realize reflection of the light beam of the first image when moving to a position where the light incident side thereof can receive the light emitted from the first reflection unit,

the light splitting device is configured to realize transmission of the light beam of the second image when moving to a position where the light incident side thereof cannot receive the light emitted from the first reflection unit,

the projection optical system further includes:

and the first driving device is respectively connected with the controller and the light splitting device and is used for driving the light splitting device to move according to a control instruction sent by the controller.

In some embodiments, when the light-splitting device is an acousto-optic crystal,

the beam splitting device is configured to effect reflection of the beam of the first image when energized,

the light splitting device is configured to effect transmission of the light beams of the second image when not powered,

the projection optical system further includes:

and the first driving device is respectively connected with the controller and the light splitting device and is used for driving the light splitting device to be electrified according to a control instruction sent by the controller.

In some embodiments, the first reflecting unit is a turning prism disposed between the image generating unit and the light splitting device at a first preset angle;

the second reflecting unit is a reflector and is arranged between the light splitting device and the second lens at a second preset angle.

In some embodiments, the automobile further includes a front windshield on which a relay image of the first lens and the second lens is imaged in the projection optical system,

the controller is further connected with the first lens and the second lens respectively, and the controller is configured to adjust a virtual image distance of the first image and the second image when the front windshield is imaged by controlling positions of the first lens and the second lens.

In some embodiments, the projection optical system further comprises:

the second driving device is respectively connected with the controller and the first lens and is used for driving the first lens to adjust the imaging position of the emergent light of the first lens according to a control instruction issued by the controller;

and the third driving device is respectively connected with the controller and the second lens and is used for driving the second lens to adjust the imaging position of the emergent light of the second lens according to a control instruction issued by the controller.

In some embodiments, the focal power of the first lens is 24mm, and the focal length of the first lens is 15.4 mm;

the focal power of the second lens is 45mm, and the focal length of the second lens is 26.4 mm.

In some embodiments, the optical power of the light splitting device is 52 mm.

In order to solve the above technical problem, in a second aspect, the embodiment of the present invention provides a new line display device of an automobile, including: the projection optical system according to the first aspect, wherein the projection optical system is capable of projecting the first image and/or the second image onto a front windshield of the automobile to form an image.

Compared with the prior art, the beneficial effects of the utility model are that: be different from the prior art, the embodiment of the utility model provides a be applied to new line display device's of car projection optical system is provided, it includes the image generation unit that sets gradually according to the light-emitting direction, first reflection unit, beam splitting device, first camera lens, second reflection unit and second camera lens, still include the controller that is connected with image generation unit and beam splitting device respectively, an image that is used for controlling image generation unit outgoing and beam splitting device's light-emitting is controlled to the branch chronogenesis, wherein, the controller configuration is to only control beam splitting device's reflection of light side light-emitting when controlling image generation unit outgoing first image, so that first image is through first camera lens outgoing imaging, and the controller configuration is to only control beam splitting device's transmission of light side light-emitting when controlling image generation unit outgoing second image, so that the second image is through second camera lens outgoing imaging, the utility model provides an embodiment projection optical system can be in two not through the mode of time-sequence control Different display contents and pictures are respectively realized at the same position, and the device has small volume and low cost.

Drawings

The embodiments are illustrated by the figures of the accompanying drawings which correspond and are not meant to limit the embodiments, in which elements/blocks having the same reference number designation may be represented by like elements/blocks, and in which the drawings are not to scale unless otherwise specified.

Fig. 1 is a schematic view of an application scenario of a projection optical system according to an embodiment of the present invention;

FIG. 2 is a schematic view of the front windshield imaging in the application scenario of FIG. 1;

fig. 3 is a schematic structural diagram of a projection optical system according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of an optical path diagram of the projection optical system configuration shown in FIG. 3;

fig. 5 is a block diagram illustrating an electrical connection structure of a projection optical system according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a head-up display device of an automobile according to a second embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that, if not conflicted, the various features of the embodiments of the invention can be combined with each other and are within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.

In order to facilitate the connection structure to be limited, the utility model discloses use the light-emitting direction of light beam to carry out the position of part and prescribe a limit to as the reference. The terms "upper", "lower", "left", "right", "vertical", "horizontal" and the like as used herein are for illustrative purposes only. In order to facilitate the limitation of the connection structure, the utility model discloses use the direction that the light beam incides the beam splitting device from overlooking the direction as the reference and carry out the position of part and prescribe a limit to.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

In order to solve current car new line display device, can only show an image picture, can not show near-field image and long-range image simultaneously, and/or show two-dimensional image and three-dimensional this kind of the condition that needs the simultaneous display two kinds of image pictures simultaneously, the embodiment of the utility model provides a projection optical system, its through in the timesharing sequence control system image beam that the image generation unit emergent with beam splitting device's light-emitting condition to make two kinds of different image pictures can be exported through first camera lens and second camera lens respectively, thereby realize different display content and picture respectively in two different positions, just the utility model discloses projection optical system that the embodiment provided is small, with low costs.

Fig. 1 is a schematic view of an application environment of a projection optical system according to an embodiment of the present invention, and fig. 2 is an imaging diagram of a front windshield in the application scene shown in fig. 1. Wherein, the application environment comprises: an automobile 1, the automobile 1 comprising: a front windshield a and a head-up display device 10.

The head-up display device 10 is provided with the projection optical system 100 provided by the embodiment of the present invention to realize the image display of two image frames, and the projection optical system 100 can output the first image P1 and the second image P2 through the first lens 110 and the second lens 120, respectively.

In this application scenario, the first image P1 is mainly used for displaying a two-dimensional image, for example, the driving information of the automobile 1, the driving information includes but is not limited to the speed information and the oil amount information of the automobile 1, and based on this, a speed sensor, an oil amount sensor, etc. should be correspondingly configured on the automobile 1, specifically, the setting of the two-dimensional image, the setting of the driving information of the automobile 1 and the corresponding sensor setting can be selected according to actual needs, and do not need to be restricted to the application scenario of the present invention.

In this application scenario, the second image P2 is mainly used for displaying a three-dimensional image, that is, an AR picture, for example, the traffic information of the road where the automobile 1 is located, the traffic information includes but is not limited to the lane, the road marking, the zebra crossing, the obstacle, the traffic light, the sign and the like on the road where the automobile 1 is located, and based on this, the automobile 1 should be correspondingly configured with detection devices such as a camera and a laser radar, and further, if the automobile 1 can realize a navigation function, the navigation indication information can be superimposed on the traffic information and displayed together, specifically, the setting of the three-dimensional image, the traffic information of the road where the automobile 1 is located and the setting of the corresponding detection devices can be selected according to actual needs, and do not need to be restricted to the application scenario of the present invention.

In this application scene, front windshield a prefers can clearly form images and the glass material that the transmittance is good makes, specifically, can select according to actual need, need not be restricted to the utility model discloses use the injecing of scene.

Specifically, the embodiments of the present invention will be further explained with reference to the drawings.

Example one

An embodiment of the present invention provides a projection optical system, can be applied to the new line display device of car as above-mentioned applied scene, please refer to fig. 3, fig. 4 and fig. 5 together, wherein, fig. 3 is the utility model provides a pair of projection optical system's structure, fig. 4 is the light path diagram of the projection optical system structure shown in fig. 3, fig. 5 is the embodiment of the utility model provides a projection optical system's electrical connection structure block diagram, projection optical system 100 includes: the image processing apparatus includes a first lens 110, a second lens 120, an image generating unit 130, a first reflecting unit 140, a light splitting device 150, a second reflecting unit 160, a controller 170, a first driving device 181, a second driving device 182, and a third driving device 183.

The image generating unit 130 for emitting a light beam containing image information of the first image and the second image; the image generating unit 130 is a dlp (digital Light processing) display chip or an LCOS (Liquid crystal on Silicon) display chip. In the embodiment of the present invention, the image generating unit 130 further includes an effective surface 131 and a protection glass 132. In some other embodiments, the image generating unit 130 may also be other image display chips such as a DMD (Digital Micromirror Device) display chip, and specifically, may be set according to actual needs, and does not need to be restricted to the limitations of the embodiments of the present invention.

The first reflection unit 140, the light incident side of which is disposed in the light emergent direction of the image generation unit 130; the first reflection unit 140 is a turning prism, and is disposed between the image generation unit 130 and the light splitting device 150 at a first preset angle, and the turning prism adopted by the first reflection unit 140 may be a total internal reflection prism TIR, so as to implement total reflection of the light beam. In the embodiment shown in fig. 4, the first reflection unit 140 is a right triangular prism, a right-angle surface of which is opposite to the image generation unit 130, and another right-angle surface of which is opposite to the light splitting device 150, and a reflection angle of an inclined surface of the first reflection unit 140 is 90 degrees, that is, a first preset angle of the first reflection unit 140 is 45 degrees, which is the preset angle, and is set in the optical path.

The light incident side of the light splitting device 150 is arranged in the light emergent direction of the light reflecting side of the first reflecting unit 140; the optical power of the light splitting device 150 is 52 mm. In the embodiment of the present invention, the light splitting device 150 is a device for splitting the light beam of the first image P1 and the light beam of the second image P2, and can split the light beams by shielding, reflecting, or split the light beams by filtering, and specifically can be set according to actual needs without being restricted by the following three modes provided by the embodiment of the present invention. The light splitting device 150 may be made of H-K9L colorless optical glass, and in some other embodiments, the material and color of the light splitting device 150 may be selected according to actual needs, specifically, the design may be performed according to actual needs, and the embodiment of the present invention and the limitations of the drawings are not limited.

It should be noted that the focal power of the optical splitter 150 is only one design parameter obtained by software simulation according to the embodiment of the present invention shown in fig. 4, in practical applications, according to the difference of the light beam propagation path, the specific design parameter of the optical splitter 150 may also obtain other parameters according to software simulation, and the embodiments of the present invention do not provide any limitation on the design parameter of the optical splitter 150 during practical simulation or production.

In some embodiments, when the light splitting device 150 is a half mirror, the light splitting device 150 is configured to achieve reflection of the light beam of the first image P1 when rotated to a first angle, and the light splitting device 150 is configured to achieve transmission of the light beam of the second image P2 when rotated to a second angle; the first driving device 181 is connected to the controller 170 and the light splitting device 150, and is configured to drive the light splitting device 150 to rotate according to a control instruction issued by the controller 170.

In some embodiments, when the light splitting device 150 is a mirror, the light splitting device 150 is configured to achieve reflection of the light beam of the first image P1 when moving to a position where the light incident side thereof can receive the light emitted from the first reflecting unit 140, and the light splitting device 150 is configured to achieve transmission of the light beam of the second image P2 when moving to a position where the light incident side thereof cannot receive the light emitted from the first reflecting unit 140; the first driving device 181 is connected to the controller 170 and the light splitting device 150, and is configured to drive the light splitting device 150 to move according to a control instruction issued by the controller 170.

In some embodiments, when the light-splitting device 150 is an acousto-optic crystal, the light-splitting device 150 is configured to effect reflection of the light beam of the first image P1 when energized, and the light-splitting device 150 is configured to effect transmission of the light beam of the second image P2 when not energized; the first driving device 181 is connected to the controller 170 and the light splitting device 150, and is configured to drive the light splitting device 150 to be powered on according to a control instruction issued by the controller 170.

The first lens 110, the light incident side of which is disposed in the light emergent direction of the light reflecting side of the light splitting device 150; the focal power of the first lens 110 is 24mm, and the focal length of the first lens 110 is 15.4 mm. Specifically, the first lens element 110 may be a single lens element, or a lens element group consisting of a plurality of lens elements, or may include other optical devices, and in an actual usage scenario, the first lens element may be set according to actual needs, and does not need to be restricted by the embodiments of the present invention. It should be noted that the focal power and the focal length of the first lens 110 are only one design parameter obtained by the software simulation according to the embodiment shown in fig. 4 of the present invention, in an actual situation, according to the difference of the light beam propagation path, the specific design parameter of the first lens 110 may also obtain other parameters according to the software simulation, and the embodiment of the present invention does not provide any limitation on the design parameter of the first lens 110 during the actual simulation or production.

The light incident side of the second reflecting unit 160 is arranged in the light emergent direction of the light transmitting side of the light splitting device 150; the second reflecting unit 160 is a reflector, and is disposed between the light splitting device 150 and the second lens 120 at a second preset angle, and the second reflecting unit 160 may further include a reflection increasing film plated on the reflector, so as to implement total reflection of the light beam. In the embodiment shown in fig. 4, the reflection angle of the inclined plane of the second reflection unit 160 is 90 degrees, that is, the second preset angle of the second reflection unit 160 is 45 degrees, which is the preset angle set in the optical path, in some other embodiments, the selection of the model and material of the second reflection unit 160, and the setting of the second preset angle can be set according to actual needs, and do not need to be restricted to the limitations of the embodiments of the present invention.

The light incident side of the second lens 120 is disposed in the light emergent direction of the light reflecting side of the second reflecting unit 160; the focal power of the second lens 120 is 45mm, and the focal length of the second lens 120 is 26.4 mm. Specifically, the second lens element 120 may be a single lens element, or a lens group composed of a plurality of lens elements, and may also include other optical devices, and in an actual usage scenario, may be set according to actual needs, and does not need to be restricted to the embodiments of the present invention. It should be noted that the focal power and the focal length of the second lens 120 are only one design parameter obtained by the software simulation according to the embodiment shown in fig. 4 of the present invention, and in an actual situation, according to the difference of the light beam propagation path, the specific design parameter of the second lens 120 may also be obtained by the software simulation.

Adopt and make like above-mentioned design parameter the utility model discloses projection optical system 100, its size can accomplish whole size control in 85mm in the direction of figure 3 is horizontal and vertical length, and the width that can accomplish the biggest position in the width on the image (be perpendicular and paper direction) that is perpendicular to figure 3 shown is 52mm, and is less for current projection optical system volume of being applied to car new line display device.

The controller 170 is connected to the image generating unit 130 and the light splitting device 150, and is configured to control the image emitted from the image generating unit 130 and the light emitted from the light splitting device in a time-division sequence; wherein the controller 170 is configured to control only the light-reflection side of the light-splitting device 150 to emit the first image P1 through the first lens 110 when controlling the image generation unit 130 to emit the first image P1; the controller 170 is configured to control only the light-transmitting side of the light splitting device 150 to emit light when controlling the image generation unit 130 to emit the second image P2, so that the second image P2 is emitted and imaged through the second lens 120. The controller 170 may be various chips, modules, units, devices and/or devices with computing functions, such as a processor, a server and the like, which are commonly used in optical projection and capable of sending control instructions, and further, the controller 170 may further have a communication function with the outside and/or a computing and/or controlling function and the like generally possessed by a projection device for receiving user gestures or instructions, and specifically, the corresponding controller 170 may be selected according to actual needs, and does not need to be restricted by the limitations of the embodiments of the present invention.

As described in the above application scenario, the automobile 1 further includes a front windshield a, and in the projection optical system 100, the relay image of the first lens 110 and the second lens 120 is imaged on the front windshield a. In the embodiment of the present invention, the controller 170 is further connected to the first lens 110 and the second lens 120, respectively, and the controller 170 is configured to adjust a virtual image distance of the first image P1 and the second image P2 when the front windshield a is imaged by controlling positions of the first lens 110 and the second lens 120. Specifically, the second driving device 182 is respectively connected to the controller 170 and the first lens 110, and is configured to drive the first lens 110 to adjust an imaging position of light emitted from the first lens 110 according to a control instruction issued by the controller 170; the third driving device 183 is respectively connected to the controller 170 and the second lens 120, and is configured to drive the second lens 120 to adjust an imaging position of light emitted from the second lens 120 according to a control instruction issued by the controller 170.

When the projection optical system provided by the embodiment of the present invention is used to display two images, taking the application scenario shown in fig. 1 and fig. 2 as an example, in the time period from t1 to t2, the image generating unit 130 plays the first image P1, and the light splitting device 150 blocks the light and reflects the light to the first lens 110 to display the first image P1; in the period from t2 to t3, the image generating unit 130 plays the second image P2, the light splitting device 150 does not block light, and the light reaches the second lens 120 to display the second image P2; then, the above steps and time control are repeated to control the image generating unit 130 to cyclically play the first image P1 and the second image P2, and to cyclically control the light output of the light splitting device 150. Preferably, in order to make the human eye appear to be simultaneously displaying the first image P1 and the second image P2, the playing time of the first image P1 (i.e., t2-t1) and the playing time of the second image P2 (i.e., t3-t2) may be controlled within 0.1 to 0.4 seconds by utilizing the phenomenon of persistence of vision, so as to realize the playing display of different display contents and pictures by way of time-sharing control. Further, the distance and size of the virtual image presented on the front windshield a can also be adjusted by adjusting the focal length and position of the first lens 110 and the second lens 120, even replacing lenses of different magnifications, and the like.

It should be noted that the first driving device 181, the second driving device 182, and/or the third driving device 183 may respectively drive the beam splitting device 150, the first lens 110, and/or the second lens 120 in a mechanical manner, may respectively drive the beam splitting device 150, the first lens 110, and/or the second lens 120 in a software-driven manner, may also respectively drive the beam splitting device 150, the first lens 110, and/or the second lens 120 in a soft-hard combination manner, for example, may be driven by a servo/motor, or may be driven by a software in a wired/wireless manner through the controller 170 and a server/system/electronic device or the like, or may be driven by a switch tube/switch circuit or the like, specifically, can set up according to actual need, need not be restricted to the utility model discloses the injeciton.

Example two

The embodiment of the present invention provides a head-up display device of an automobile, which can be the automobile 10 according to the above application scenario, and the head-up display device can be the head-up device according to the above application scenario, please refer to fig. 6, which shows the structure of the head-up display device 10 according to the embodiment of the present invention, the head-up display device 10 includes the projection optical system 100 according to the above embodiment scenario, and the projection optical system 100 can project the first image P1 and/or the second image P2 on the front windshield a of the automobile 10 to realize imaging.

It should be noted that, the specific structure of the projection optical system 100 is as described in the first embodiment, and please refer to the description of the projection optical system 100 in the first embodiment, which is not described in detail herein.

The embodiment of the utility model provides an embodiment provides a be applied to new line display device's of car projection optical system, it includes the image generation unit that sets gradually according to the light-emitting direction, first reflection unit, beam splitting device, first camera lens, second reflection unit and second camera lens, still include the controller of being connected with image generation unit and beam splitting device respectively, an image and beam splitting device's that is used for controlling image generation unit outgoing of branch chronogenesis control light, wherein, the controller configuration is to only control beam splitting device's reflection of light side light-emitting when controlling image generation unit outgoing first image, so that first image is through first camera lens outgoing imaging, and the controller configuration is to only control beam splitting device's transmission side light-emitting when controlling image generation unit outgoing second image, so that the second image is through second camera lens outgoing imaging, the embodiment provides a projection optical system can realize different positions respectively through the mode of chronogenesis control, two different positions are realized respectively Display content and pictures, and have small volume and low cost.

It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A projection optical system, characterized by being applied to a head-up display device of an automobile, the system comprising:

2. The projection optical system according to claim 1,

when the light splitting device is a half-reflecting and half-transmitting mirror,

the projection optical system further includes:

3. The projection optical system according to claim 1,

when the light splitting device is a reflector,

the projection optical system further includes:

4. The projection optical system according to claim 1,

when the light splitting device is an acousto-optic crystal,

the projection optical system further includes:

5. The projection optical system according to any one of claims 1 to 4,

the first reflecting unit is a steering prism and is arranged between the image generating unit and the light splitting device at a first preset angle;

6. The projection optical system according to claim 5,

the automobile further includes a front windshield on which relay images of the first lens and the second lens are imaged in the projection optical system,

7. The projection optical system according to claim 6,

the projection optical system further includes:

8. The projection optical system according to claim 7,

the focal power of the first lens is 24mm, and the focal length of the first lens is 15.4 mm;

9. The projection optical system according to claim 8,

the focal power of the light splitting device is 52 mm.

10. A head-up display device for an automobile, comprising: the projection optical system according to any one of claims 1 to 9, which is capable of projecting the first image and/or the second image onto a front windshield of the automobile for imaging.