Lens system with detection function, head-up display device and detection method

Abstract

The invention relates to a lens system with a detection function, head-up display equipment and a detection method, the lens system with the detection function comprises a lens, a transmission part, a light source, a diffractive optical element and a detector, the transmission part is connected to the lens, and the transmission part is arranged to be capable of rotating around the axial direction parallel to the first direction; the light source is arranged on the side, in the first direction, of the transmission part, the diffractive optical element is located on the radial side of the transmission part, the relative position of the diffractive optical element and the transmission part is fixed, and the diffractive optical element is arranged in the mode that light passing through different positions of the diffractive optical element forms different diffraction patterns. The detector is arranged on the side, away from the light source, of the diffractive optical element and used for receiving light rays which are emitted by the light source and pass through or not pass through the diffractive optical element and judging the state of the transmission part according to a diffraction pattern formed by the received light rays. According to the invention, the states of the transmission member and the lens can be detected, and the detection precision is good.

Description

Technical Field

[0001] The present application relates to the technical field of head-up display, and in particular to a lens system with a detection function, a head-up display device and a detection method. Background Art

[0002] The head-up display system is mainly used to project key driving information directly in front of the driver's line of sight. The driver needs to make accurate driving movements based on the information provided, so whether the components in the head-up display system fail and in what state are they failing is very important to the driver.

[0003] For example, the free-form surface mirror in the head-up display system is usually connected to a motor and other driving parts and gears. If the driving part fails, or the gears slip or come off, the free-form surface mirror will not be able to transmit light normally, causing the head-up display system to fail. Therefore, it is very important to detect the gears connected to the free-form surface mirror in the head-up display system.

[0004] However, it is difficult to detect whether the gears connected to the free-form surface mirror in the head-up display system have failed and the failure status in the related art. Summary of the invention

[0005] Based on this, it is necessary to provide a lens system and a head-up display device with detection function to address the problem in the related art that it is difficult to accurately detect whether the gears connected to the free-form mirror in the head-up display system have failed and the failure state.

[0006] According to one aspect of the present application, a lens system with a detection function is provided, and the lens system with a detection function includes:

[0007] lens;

[0008] A transmission member connected to the lens, wherein the transmission member is configured to be rotatable about an axial direction parallel to the first direction so as to transmit a driving force for displacement to the lens;

[0009] A light source, disposed on one side of the transmission member along the first direction;

[0010] a diffractive optical element, located on one radial side of the transmission member, wherein the relative position of the diffractive optical element and the transmission member is fixed, and the diffractive optical element is configured to enable light passing through different positions of the diffractive optical element to form different diffraction patterns; and

[0011] The detector is arranged on a side of the diffractive optical element away from the light source, and is used to receive the light emitted by the light source that passes through or does not pass through the diffractive optical element, and judge the state of the transmission member according to the diffraction pattern formed by the received light.

[0012] In one embodiment, the diffractive optical element comprises a diffractive surface, and the diffractive surface is arranged at an angle with the first direction.

[0013] In one embodiment, the lens comprises a free-form mirror, and the light source comprises an invisible light source.

[0014] In one of the embodiments, the diffractive optical element is disposed on the transmission member, and a portion of the diffractive optical element is embedded in the transmission member.

[0015] In one embodiment, the detector comprises a one-dimensional array of photodetectors.

[0016] In one embodiment, the lens system with detection function includes a plurality of the diffractive optical elements, which are sequentially arranged on the circumference of the transmission member around an axis parallel to the first direction, and the diffraction patterns formed by the light passing through each of the diffractive optical elements are different.

[0017] In one embodiment, two adjacent diffractive optical elements are arranged without any gap between them.

[0018] In one embodiment, the diffractive optical element is configured to surround the transmission member around an axis parallel to the first direction.

[0019] According to another aspect of the present application, a head-up display device is provided, comprising the lens system with a detection function as described in any one of the above embodiments.

[0020] According to another aspect of the present application, a detection method is provided for detecting a transmission member, wherein the transmission member is capable of rotating about an axial direction parallel to a first direction, and a diffractive optical element is provided on the transmission member, and the diffractive optical element is configured so that light passing through different positions of the diffractive optical element forms different diffraction patterns, and the detection method comprises:

[0021] The light source emits detection light;

[0022] receiving the detection light by the detector;

[0023] The state of the transmission member is determined according to the diffraction pattern formed by the detection light.

[0024] The above-mentioned lens system with detection function is equivalent to marking the relative position of the transmission part by setting the diffractive optical element and the transmission part to be fixed. When the transmission part rotates to different positions and the light emitted by the light source passes through the diffractive optical element part, the light emitted by the light source passes through different positions on the diffractive optical element to form different diffraction patterns. After the detector receives the corresponding diffraction pattern, it can be determined what state the transmission part is in. When the transmission part rotates to different positions and the light emitted by the light source does not pass through the diffractive optical element part, the light emitted by the light source directly irradiates the detector to form a light spot with the same shape as the light emitted by the light source. It can be understood that if the detector detects the light spot for a long time, it means that the transmission part has not rotated for a long time and a fault has occurred, and the state of the transmission part at this time is exactly the state of the side close to the diffractive optical element away from the light source and the detector. Based on the above concept, it is possible to detect the transmission part such as gear slippage or tooth disengagement. If the gear state after the tooth slip or tooth stripping is that the diffractive optical element on the gear is just located between the light source and the detector, the specific position of the transmission member can be determined according to the diffraction pattern received by the detector, and it can be understood that the diffractive optical element after tooth stripping will be offset to a certain extent compared to the state without tooth stripping, so that the diffraction pattern formed when the gear is stripped and not stripped at the same position is also different, so it can also accurately determine whether the gear is stripped. If the gear state after the tooth slip or tooth stripping is that the diffractive optical element on the gear is not located between the light source and the detector, the detector will receive a light spot with the same shape as the light emitted by the light source for a long time, so it can still be determined that the gear is faulty. At the same time, the lens system with detection function of the present application uses the interference or diffraction pattern of light to detect position changes even under slight movement, and has more sophisticated detection and higher detection accuracy than the existing rotary encoder. And the lens system with detection function of the present application is non-contact detection, and the diffraction pattern is read through optical scanning, and physical contact is not required, which helps to improve durability and reduce wear, and thus can still have a more accurate detection accuracy after long-term use. Furthermore, the present application has better data storage capacity through the use and design of diffractive optical elements. By designing the diffractive optical elements, the optical information on the diffractive optical elements can be used to store encoded data to achieve multifunctional detection or information transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a lens system with a detection function according to an embodiment of the present application.

[0026] Figure 2 for Figure 1 A simplified schematic diagram of the lens system with detection function is shown.

[0027] Figure 3 for Figure 2 The schematic diagram of the structure shows that the diffractive optical element of the lens system with detection function is located between the light source and the detector.

[0028] Figure 4 for Figure 2 Schematic diagram of the structure in which the diffractive optical element of the lens system with detection function is not located between the light source and the detector.

[0029] Figure 5 This is a schematic structural diagram of a lens system with a detection function including multiple diffractive optical elements in an embodiment of the present application.

[0030] Figure 6 This is a schematic structural diagram of a diffractive optical element of a lens system with a detection function surrounding a transmission member in an embodiment of the present application.

[0031] Description of Figure Numbers:

[0032] 10. Lens system with detection function;

[0033] 1. Light source; 2. Diffractive optical element; 3. Detector; 4. Transmission parts;

[0034] F1, first direction. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0041] Vehicle safety performance is a crucial aspect in the process of vehicle design, manufacturing and use, which affects the life safety of drivers, passengers and pedestrians. Therefore, the requirements for failure of vehicle systems are extremely stringent.

[0042] For example, when the head-up display system is in use, it projects key driving information directly in front of the driver's line of sight. The driver needs to perform accurate driving actions based on the information provided. Therefore, whether the components in the head-up display system are failed and what state they are in are very important to the driver. For example, the free-form mirror in the head-up display system directly outputs light to the windshield to form an image for the driver to see. In the design of the head-up display system, a structure is usually set to control the eccentricity and rotation of each free-form mirror and the coordinate return. By controlling the distance between the curved mirrors, the distance between the curved mirror and the eye box, and the rotation of the curved mirror, the light path can be folded as much as possible, thereby reducing the space size of the head-up display system and controlling the astigmatism.

[0043] Therefore, whether the displacement failure of the free-form mirror directly affects the normal display of the entire head-up display system. Accurately judging the status of the free-form mirror is conducive to saving the maintenance cost of the head-up display system. For example, when the head-up display system cannot display normally, it can be determined whether the position of the free-form mirror is offset. If the head-up display system cannot display normally due to the position offset of the free-form mirror, its status can be directly adjusted without wasting manpower and financial resources on testing other components, which is obviously conducive to saving maintenance costs.

[0044] Usually, the failure of the free-form mirror is mainly caused by the failure of the gear or motor driving the free-form mirror, such as gear slippage or tooth stripping. However, it is difficult to achieve real-time and accurate detection of whether the gear connected to the free-form mirror in the head-up display system has failed and the failure state in the related art.

[0045] It is usually difficult to perform real-time angle or displacement monitoring in related technologies, and the limit zeroing method is usually used to confirm the position. It can be understood that the motor first touches the origin and then reaches the specified angle by calculating the number of steps. In the event of gear disengagement or slippage, the motor can only return to the origin and recalculate the position. In this way, the position cannot be known in real time on the HUD.

[0046] For example, if the specified position is at a 30-degree angle, the motor needs to rotate 1850 steps clockwise to reach that position. Therefore, each time the motor is turned on, it needs to rotate counterclockwise until it touches the origin switch, and then rotate 1850 steps clockwise after confirming the origin. However, once vibration or collision occurs, the system has rotated 1850 steps, but the motor position has exceeded or not reached that position. At this time, the system cannot know the motor position and can only return to the origin and repeat the above steps.

[0047] In the related technology, micro switches, Hall sensors or photo interrupters are usually used for angle or displacement detection. Micro switches are mainly triggered mechanically, and their accuracy depends on the structure. If you want higher detection accuracy, the requirements for its structure are extremely high. It is also easy to wear, requires physical contact, has limited installation position, and is easily affected by dust and contact wear. Hall sensors need to be installed with magnets, which are relatively expensive, especially the configuration related to magnets will greatly increase the cost. The photo interrupter is also relatively expensive, and is easily affected by dust or debris. It is necessary to keep the optical path clear at all times, and it is not easy to maintain.

[0048] Based on this, the present application provides a lens system, a head-up display device and a detection method with detection functions to detect whether a gear, a motor, or other rotating mobile device has failed, and can also detect its failure state, especially suitable for a free-form surface mirror in a head-up display system, with better detection accuracy.

[0049] See also Figure 1 , combined with reference Figure 2 and Figure 3 As shown, Figure 1 It is a structural schematic diagram of a lens system 10 with a detection function according to an embodiment of the present application. Figure 2 for Figure 1 A simplified schematic diagram of the structure of a lens system 10 with a detection function is shown. Figure 3 for Figure 2 The structure schematic diagram shows that the diffractive optical element 2 of the lens system 10 with detection function is located between the light source 1 and the detector 3.

[0050] The present application provides a lens system 10 with a detection function, and the lens system 10 with a detection function includes a lens, a light source 1, a diffractive optical element 2, a detector 3 and a transmission member 4. The transmission member 4 is connected to the lens, and the transmission member 4 is configured to be able to rotate around an axial direction parallel to a first direction F1 to transmit a driving force for displacement to the lens. The light source 1 is arranged on one side of the transmission member 4 along the first direction F1. The diffractive optical element 2 is located on one radial side of the transmission member 4, and the relative positions of the diffractive optical element 2 and the transmission member 4 are fixed. The diffractive optical element 2 is configured to enable light passing through different positions of the diffractive optical element 2 to form different diffraction patterns. The detector 3 is arranged on the side of the diffractive optical element 2 away from the light source 1, and the detector 3 is used to receive light emitted by the light source 1 that passes through or does not pass through the diffractive optical element 2, and judge the state of the transmission member 4 according to the diffraction pattern formed by the received light.

[0051] Understandable, combined with reference Figure 3As shown, the above-mentioned lens system 10 with detection function, by setting the relative position of the diffractive optical element 2 and the transmission member 4 to be fixed, is equivalent to marking the relative position of the transmission member 4. When the transmission member 4 rotates to different positions and the light emitted by the light source 1 passes through the diffractive optical element 2, the light emitted by the light source 1 passes through different positions on the diffractive optical element 2 to form different diffraction patterns. After the detector 3 receives the corresponding diffraction pattern, it can be determined what specific state the transmission member 4 is in.

[0052] Combined with reference Figure 4 As shown, Figure 4 for Figure 2 The schematic diagram of the structure of the lens system 10 with detection function is shown in which the diffractive optical element 2 is not located between the light source 1 and the detector 3. When the transmission member 4 rotates to different positions and the light emitted by the light source 1 does not pass through the diffractive optical element 2, the light emitted by the light source 1 directly irradiates the detector 3, forming a light spot with the same shape as the light emitted by the light source 1. It can be understood that if the detector 3 detects the light spot for a long time, it means that the transmission member 4 does not rotate for a long time and fails, and the state of the transmission member 4 at this time is exactly the state where the side close to the diffractive optical element 2 is far away from the light source 1 and the detector 3.

[0053] Based on the above concept, it is possible to detect the occurrence of tooth slippage or tooth disengagement failures in transmission parts 4 such as gears or motors. If the state of the gear after tooth slippage or tooth disengagement is that the diffractive optical element 2 on the gear is exactly between the light source 1 and the detector 3, the specific position of the gear can be determined based on the diffraction pattern received by the detector 3, and it can be understood that the diffractive optical element 2 after tooth disengagement will be offset to a certain extent compared to the state without tooth disengagement, so that the diffraction patterns formed when the teeth are disengaged and when they are not disengaged at the same position are also different. In this way, it is also possible to accurately determine whether the teeth are disengaged. If the state of the gear after tooth slippage or tooth disengagement is that the diffractive optical element 2 on the gear is not located between the light source 1 and the detector 3, the detector 3 will receive a light spot with the same shape as the light emitted by the light source 1 for a long time. In this way, it is still possible to determine that the gear is faulty, so that the state of the transmission part 4 can be determined.

[0054] At the same time, the lens system 10 with detection function of the present application utilizes the interference or diffraction pattern of light to detect position changes even with slight movements, and has more sophisticated detection and higher detection accuracy than existing rotary encoders. Moreover, the lens system 10 with detection function of the present application is a non-contact detection, which reads the diffraction pattern through optical scanning, does not require physical contact, helps to improve durability and reduce wear, and can still have relatively accurate detection accuracy after long-term use. Furthermore, the present application has better data storage capacity through the use and design of the diffraction optical element 2. By designing the diffraction optical element 2, the optical information on the diffraction optical element 2 can be used to store coded data to achieve multifunctional detection or information transmission. That is, the lens system 10 with detection function of the present application also has better detection accuracy.

[0055] In some embodiments, the diffractive optical element 2 includes a diffractive surface, and the diffractive surface is set at an angle with the first direction F1. It can be understood that the diffractive surface of the diffractive optical element 2 is at a certain angle with the first direction F1, which is conducive to allowing the light emitted by the light source 1 to pass through the diffractive optical element 2 and enter the detector 3 for detection. Figure 3 As shown, in this embodiment, the diffractive surface of the diffractive optical element 2 is perpendicular to the first direction F1, so as to reduce the resistance of the transmission member 4 when the transmission member 4 rotates. In addition, the diffractive optical element 2 can be designed to be disposed on the transmission member 4 in various forms according to the rotation requirements of the transmission member 4, and no excessive restrictions are made here.

[0056] In some embodiments, the diffractive optical element 2 is disposed on the transmission member 4, and part of the diffractive optical element 2 is embedded in the transmission member 4. Thus, no other installation structure is required, which is conducive to simplifying the system structure, improving installation convenience and saving costs.

[0057] In some embodiments, the lens includes a free-form surface mirror, which can be used in a head-up display device to provide the device with a function of detecting the state of the free-form surface mirror in the head-up display device. The state of the free-form surface mirror can be determined in real time. When the head-up display device cannot emit light normally, it can first determine whether the problem comes from the free-form surface mirror or the lens system 10 with a detection function, which helps to save maintenance costs.

[0058] In some embodiments, the light source 1 includes an invisible light source, and is a point light source. In this way, when the lens system 10 with a detection function is used in a head-up display device, the invisible light emitted by the light source 1 will not interfere with the light emitted by the head-up display device itself, thereby ensuring that the head-up display device still has a better display effect.

[0059] In some embodiments, the detector 3 includes a one-dimensional array light detector. The provision of a one-dimensional array light detector is conducive to meeting detection requirements while saving costs. It can be understood that the diffraction optical element 2 and the transmission member 4 that can produce diffraction patterns of different lengths are fixed relative to each other. When the light emitted by the light source 1 passes through the diffraction optical elements 2 at different positions, it will become a line light source of different lengths, or form light spots of different lengths. Then, the one-dimensional array light detector is used to detect light spots of different lengths to obtain the current corresponding position of the gear. Therefore, the use of a one-dimensional array light detector can meet detection requirements. At the same time, compared with other detection devices, the one-dimensional array light detector has the advantages of low cost and better detection accuracy, so that it can save costs while meeting detection requirements.

[0060] In some embodiments, in conjunction with Figure 5 As shown, Figure 5 The lens system 10 with detection function in one embodiment of the present application includes a plurality of diffractive optical elements 2. The lens system 10 with detection function includes a plurality of diffractive optical elements 2, which are sequentially arranged around the axis parallel to the first direction F1 on the circumference of the transmission member 4, and the diffraction patterns formed by the light passing through each diffractive optical element 2 are different. In this way, it is equivalent to expanding the coverage of the diffractive optical element 2 relative to the transmission member 4, which is equivalent to encoding all the places around the transmission member 4, which is conducive to obtaining more accurate detection.

[0061] In some embodiments, two adjacent diffractive optical elements 2 of the plurality of diffractive optical elements 2 are arranged without spacing from each other. In this way, a diffractive optical element 2 is provided at any position around the transmission member 4, further increasing the coverage of the diffractive optical element 2 relative to the transmission member 4, further improving the detection accuracy, and being able to accurately detect the position of the transmission member 4.

[0062] In some embodiments, in conjunction with Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of a diffractive optical element 2 of a lens system 10 with a detection function in one embodiment of the present application, which surrounds a transmission member 4. The diffractive optical element 2 is configured to be able to surround the transmission member 4 around an axis parallel to the first direction F1. That is, a comprehensive detection of the transmission member 4 can be achieved through a diffractive optical element 2, which is equivalent to increasing and expanding the coverage of the diffractive optical element 2 relative to the transmission member 4, and can accurately detect the position of the transmission member 4.

[0063] In some embodiments, the lens system 10 with detection function further includes a driving member, which is connected to the lens through a transmission member 4 to drive the transmission member 4 to rotate around an axis parallel to the first direction F1, and drive the lens to deflect or rotate. A diffractive optical element 2 is installed on the gear to store light information in a specific area of ​​the diffraction pattern, and optical interference can be used to identify the position of the gear or the movement of a driving member such as a motor connected to the gear. The change in the diffraction signal can reflect the angle or distance of the gear rotation, which is conducive to providing high-resolution positioning and detection functions.

[0064] The present application also provides a head-up display device, including the lens system 10 with a detection function in any of the above embodiments. The above lens can be a free-form surface mirror in the head-up display device. By adopting the lens system 10 with a detection function of the present application, the state of the free-form surface mirror and the transmission member 4 connected thereto can be monitored in real time, which is beneficial to monitoring the display state of the head-up display device and improving driving safety.

[0065] The present application also provides a detection method for detecting a transmission member 4, wherein the transmission member 4 can rotate about an axial direction parallel to the first direction F1, and a diffractive optical element 2 is provided on the transmission member 4, and the diffractive optical element 2 is configured to form different diffraction patterns for light passing through different positions of the diffractive optical element 2, and the detection method comprises: emitting detection light through a light source 1, receiving the detection light through a detector 3, and judging the state of the transmission member 4 according to the diffraction pattern formed by the detection light. It can be understood that the detection light emitted by the light source 1 is provided on one side of the transmission member 4, and can pass through or not pass through the diffractive optical element 2, and when the transmission member 4 rotates to different positions and the light emitted by the light source 1 passes through a part of the diffractive optical element 2, the light emitted by the light source 1 passes through different positions on the diffractive optical element 2 to form different diffraction patterns, and after the detector 3 receives the corresponding diffraction pattern, it can be judged what specific state the transmission member 4 is in. When the transmission member 4 rotates to different positions and the light emitted by the light source 1 does not pass through a part of the diffractive optical element 2, the light emitted by the light source 1 directly irradiates the detector 3, forming a light spot with the same shape as the light emitted by the light source 1. If the detector 3 detects the light spot for a long time, it means that the transmission member 4 does not rotate for a long time and fails, and the state of the transmission member 4 at this time is that the side close to the diffractive optical element 2 is far away from the light source 1 and the detector 3.

[0066] The lens system 10 with detection function of the present application utilizes interference or diffraction patterns of light to detect position changes even with slight movements, and has more sophisticated detection and higher detection accuracy than existing rotary encoders. Moreover, the lens system 10 with detection function of the present application is a non-contact detection, which reads the diffraction pattern through optical scanning, and does not require physical contact, which helps to improve durability and reduce wear, and thus can still have relatively accurate detection accuracy after long-term use. Furthermore, the present application has better data storage capacity through the use and design of the diffraction optical element 2. By designing the diffraction optical element 2, the optical information on the diffraction optical element 2 can be used to store coded data to achieve multifunctional detection or information transmission. That is, the lens system 10 with detection function of the present application also has better detection accuracy.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A lens system with detection function, characterized in that: The lens system with detection function comprises: lens; A transmission member connected to the lens, wherein the transmission member is configured to be rotatable about an axial direction parallel to the first direction so as to transmit a driving force for displacement to the lens; a light source, disposed on one side of the transmission member along the first direction; a diffractive optical element, located on one radial side of the transmission member, wherein the relative position of the diffractive optical element and the transmission member is fixed, and the diffractive optical element is configured to enable light passing through different positions of the diffractive optical element to form different diffraction patterns; and The detector is arranged on a side of the diffractive optical element away from the light source, and is used to receive the light emitted by the light source that passes through or does not pass through the diffractive optical element, and judge the state of the transmission member according to the diffraction pattern formed by the received light.

2. The lens system with detection function according to claim 1, characterized in that: The diffractive optical element comprises a diffractive surface, and the diffractive surface is arranged at an angle with the first direction.

3. The lens system with detection function according to claim 1, characterized in that: The lens comprises a free-form surface mirror, and the light source comprises an invisible light source.

4. The lens system with detection function according to claim 1, characterized in that: The diffractive optical element is arranged on the transmission member, and a part of the diffractive optical element is embedded in the transmission member.

5. The lens system with detection function according to claim 1, characterized in that: The detector comprises a one-dimensional array light detector.

6. The lens system with detection function according to claim 1, characterized in that: The lens system with detection function includes a plurality of diffractive optical elements, which are sequentially arranged around an axis parallel to the first direction on the circumference of the transmission member, and the diffraction patterns formed by the light passing through each of the diffractive optical elements are different.

7. The lens system with detection function according to claim 6, characterized in that: Two adjacent diffractive optical elements are arranged without any gap between them.

8. The lens system with detection function according to claim 1, characterized in that: The diffractive optical element is configured to surround the transmission member around an axis parallel to the first direction.

9. A head-up display device, characterized in that: The lens system comprising the detection function as claimed in any one of claims 1 to 8.

10. A detection method for detecting a transmission member, wherein the transmission member can rotate about an axial direction parallel to a first direction, and a diffractive optical element is arranged on the transmission member, and the diffractive optical element is arranged so that light passing through different positions of the diffractive optical element forms different diffraction patterns, characterized in that: The detection method comprises: Detect light emitted by a light source; Receiving the detection light through a detector; The state of the transmission member is determined according to the diffraction pattern formed by the detection light.

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