Imaging module, electronic equipment and vehicle

Abstract

The invention discloses an imaging module, electronic equipment and a vehicle, and aims to solve the technical problem of low reliability of the imaging module. In the imaging module, a first lens assembly comprises a first lens, a second lens and a third lens which are sequentially arranged at intervals in the direction close to a diaphragm, the focal power of the first lens and the third lens is negative, and the focal power of the second lens is positive; the second lens assembly comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged at intervals in the direction away from the diaphragm, the focal power of the fourth lens is negative, and the focal power of the fifth lens, the focal power of the sixth lens and the focal power of the seventh lens are all positive. According to the imaging module, the adjacent lenses are arranged at intervals, and compared with the mode that two adjacent lenses are connected together through connecting glue, the phenomenon that the connecting glue cracks due to vibration can be avoided, and then the reliability of the imaging module is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of imaging devices, and specifically to an imaging module, an electronic device and a vehicle. Background Art

[0002] The head-up display system (HUD) includes an imaging module, which can project the vehicle's driving data onto the vehicle's front windshield to ensure that the driver can obtain the driving data without lowering his head, avoiding the driver's eyes from straying from the road ahead, thereby improving driving safety. The imaging module includes multiple lenses, where two adjacent lenses are connected together by connecting glue to form a glued lens. However, the vehicle will vibrate while driving, which can easily cause the connecting glue to crack, resulting in low reliability of the imaging module. Summary of the invention

[0003] The embodiments of the present application provide an imaging module, an electronic device and a vehicle, aiming to improve the reliability of the imaging module.

[0004] In a first aspect, an embodiment of the present application provides an imaging module, comprising: a display device, an aperture, a first lens assembly and a second lens assembly, wherein the aperture and the display device are arranged at intervals along the optical axis; the first lens assembly is arranged on the image side of the aperture, and the optical focal length of the first lens assembly is positive; the first lens assembly comprises a first lens, a second lens and a third lens which are arranged in sequence at intervals in a direction close to the aperture, the optical focal lengths of the first lens and the third lens are negative, and the optical focal length of the second lens is positive; the second lens assembly is arranged on the object side of the aperture, and the second lens assembly comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence at intervals in a direction away from the aperture, the optical focal length of the fourth lens is negative, and the optical focal lengths of the fifth lens, the sixth lens and the seventh lens are all positive.

[0005] Through the above-mentioned setting, the aperture and the display device are spaced apart, the first lens assembly is set on the image side of the aperture, and the optical focal length of the first lens assembly is positive; the first lens assembly includes a first lens, a second lens, and a third lens that are sequentially spaced apart in a direction close to the aperture, the optical focal lengths of the first lens and the third lens are negative, and the optical focal length of the second lens is positive; the second lens assembly is set on the object side of the aperture, and the second lens assembly includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens that are sequentially spaced apart in a direction away from the aperture, the optical focal length of the fourth lens is negative, and the optical focal lengths of the fifth lens, the sixth lens, and the seventh lens are all positive. The setting of the interval between adjacent lenses can avoid cracking of the connecting glue caused by vibration, compared with connecting two adjacent lenses together by connecting glue, thereby improving the reliability of the imaging module.

[0006] In some embodiments that may include the above embodiments, the focal length f of the imaging module satisfies: 12.5 mm ≤ f ≤ 15 mm. It is understandable that the imaging module satisfies:

[0007]

[0008] Among them, BFL is the shortest distance between the display device and the light incident surface of the seventh lens, and L is the shortest distance between the light exit surface of the first lens and the projection image plane (when the electronic device is a head-up display system, the distance is the shortest distance between the first lens and the front windshield, and when the electronic device is a projector, the distance is the shortest distance between the first lens and the screen). It can be seen from the above formula that when the shortest distance BFL between the display device and the light incident surface of the seventh lens is the same, the focal length f satisfies: 12.5mm≤f≤15mm, and the focal length f is moderate, so that the focal length of the imaging component is not too large, thereby avoiding the shortest distance between the light exit surface of the first lens and the projection image plane being too large; at the same time, it can also avoid the focal length of the imaging component being too small, thereby avoiding the shortest distance between the light exit surface of the first lens and the projection image plane being too small.

[0009] In some embodiments that may include the above embodiments, the distance L between the first lens and the image plane of the imaging module satisfies: 100mm≤L≤150mm. This arrangement makes the distance between the imaging module and the projection image plane smaller, thereby preventing foreign objects from entering between the imaging module and the projection image plane to avoid blocking light; in addition, the size of the entire optical system (including the projection image plane and the imaging module) is also reduced.

[0010] In some embodiments that may include the above embodiments, the distance BFL between the surface of the seventh lens facing the display device and the display device satisfies: 20mm≤BFL≤30mm. In this way, the distance between the seventh lens and the display device is small, thereby reducing the length of the imaging module along the optical axis, and realizing the miniaturization of the imaging module and the electronic device.

[0011] In some embodiments that may include the above embodiments, the length TTL of the imaging module along the optical axis satisfies: 67mm≤TTL≤77mm. Such a configuration can further reduce the length of the imaging module along the optical axis to reduce the size of the imaging module and the electronic device.

[0012] In some embodiments that may include the above embodiments, the aperture coefficient Fno of the imaging module satisfies: Fno≥2.3. This arrangement can ensure that the imaging module has a large amount of light transmission while avoiding the imaging module's focal length being too large or the imaging module's light transmission diameter being too small.

[0013] In some embodiments that may include the above embodiments, the focal length f1 of the first lens satisfies: -57≤f1≤-75, the focal length f2 of the second lens satisfies: 25≤f2≤40, and the focal length f3 of the third lens satisfies: -17≤f3≤-30. In this way, the focal length of the first lens assembly is moderate while ensuring that the optical power of the first lens assembly is positive.

[0014] In some embodiments that may include the above embodiments, the focal length f4 of the fourth lens satisfies: -18≤f4≤-8, the focal length f5 of the fifth lens satisfies: 10≤f5≤30, the focal length f6 of the sixth lens satisfies: 18≤f6≤40, and the focal length f7 of the seventh lens satisfies: 30≤f7≤40. In this way, the optical power of the second lens assembly is positive, and the second lens assembly can converge the light from the display device, which can prevent the focal length of the first lens assembly from being too small.

[0015] In some embodiments that may include the above embodiments, the aperture D1 of the first lens satisfies: 21 mm≤D1≤26 mm, so that the first lens can have a sufficiently large aperture to meet a sufficient light throughput.

[0016] In some embodiments that may include the above embodiments, the imaging module further includes a beam splitter prism, and the beam splitter prism is located between the second lens assembly and the display device. In this way, the beam splitter prism can separate the polarized light required for projection from other polarized light, thereby allowing the polarized light required for projection to be projected toward the second lens assembly, avoiding interference from other polarized light, thereby improving the imaging quality (such as clarity, contrast, etc.) of the imaging module.

[0017] In a second aspect, an embodiment of the present application further provides an electronic device, comprising: a housing, and the imaging module as described above, wherein the imaging module is disposed on the housing.

[0018] The electronic device provided in the embodiments of the present application includes the imaging module in any of the above embodiments, so the two can solve the same technical problems and achieve the same technical effects.

[0019] In a third aspect, an embodiment of the present application further provides a vehicle, comprising: a vehicle body, a front windshield, and the electronic device as described above, wherein the vehicle body is arranged to form a cab, and the front windshield is arranged at the front end of the cab; the electronic device is arranged in the cab, and the electronic device is used to project driving data onto the front windshield.

[0020] The vehicle provided in the embodiments of the present application includes the electronic device in any of the above embodiments, so the two can solve the same technical problems and achieve the same technical effects.

[0021] In some embodiments that may include the above embodiments, the vehicle further includes a dashboard, which is arranged in the cab, and the electronic device is arranged in the dashboard. In this arrangement, the electronic device is arranged in the dashboard and does not occupy space in the cab; in addition, the distance between the dashboard and the front windshield is small, which can prevent objects in the cab from blocking light.

[0022] In some embodiments that may include the above embodiments, the electronic device is located on the top of the cab, and the electronic device is arranged on the vehicle body. In this arrangement, the electronic device is located on the top of the cab, which facilitates the installation and maintenance of the electronic device compared to installing it in the dashboard. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a structure in which an electronic device provided in an embodiment of the present application is installed on a vehicle;

[0024] Figure 2 A schematic diagram of the structure of an imaging module provided in an embodiment of the present application;

[0025] Figure 3 A schematic projection diagram of an imaging module provided in an embodiment of the present application;

[0026] Figure 4 is a spherical chromatic aberration diagram of the imaging module in Example 1;

[0027] Figure 5 is an astigmatism field curvature diagram of the imaging module in Example 1;

[0028] Figure 6 is a distortion diagram of the imaging module in Example 1;

[0029] Figure 7 is a relative illumination diagram of the imaging module in Example 1;

[0030] Figure 8 is a spherical chromatic aberration diagram of the imaging module in Example 2;

[0031] Fig. 9 is an astigmatism field curvature diagram of the imaging module in Example 2;

[0032] Fig.10 is the distortion diagram of the imaging module in Example 2;

[0033] Fig.11 is a relative illumination diagram of the imaging module in Example 2;

[0034] Fig.12 is the spherical chromatic aberration diagram of the imaging module in Example 3;

[0035] Fig.13 is the astigmatism field curvature diagram of the imaging module in Example 3;

[0036] Fig.14 This is the distortion diagram of the imaging module in Example 3;

[0037] Fig.15 is a relative illumination diagram of the imaging module in Example 3;

[0038] Fig.16 is a spherical chromatic aberration diagram of the imaging module in Example 4;

[0039] Fig.17 is an astigmatism field curvature diagram of the imaging module in Example 4;

[0040] Fig.18 is the distortion diagram of the imaging module in Example 4;

[0041] Fig.19 is a relative illumination diagram of the imaging module in Example 4;

[0042] Fig. 20 is a spherical chromatic aberration diagram of the imaging module in Example 5;

[0043] Fig.21 is an astigmatism field curvature diagram of the imaging module in Example 5;

[0044] Fig. 22 This is the distortion diagram of the imaging module in Example 5;

[0045] Fig.23 This is the relative illumination diagram of the imaging module in Example 5.

[0046] Explanation of the reference numerals: 1: electronic device; 10: front windshield; 20: instrument panel; 100: imaging module; 101: first lens; 102: second lens; 103: third lens; 104: aperture; 105: fourth lens; 106: fifth lens; 107: sixth lens; 108: seventh lens; 109: dichroic prism; 110: first lens assembly; 120: second lens assembly; 130: display device; 140: projection image plane. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0048] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0049] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left", "right", "horizontal" and "vertical" are defined relative to the orientation of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to changes in the orientation of the components placed in the drawings.

[0050] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, an electrical connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0051] An embodiment of the present application provides an electronic device, which may include: a projector, a head-up display system (Head-up Display for short HUD), VR, AR, etc.

[0052] Please refer to Figure 1 In the implementation mode in which the electronic device 1 includes a head-up display system, the head-up display system is generally arranged on a vehicle, the vehicle includes a vehicle body, a front windshield 10 and an instrument panel 20, the vehicle body is surrounded by a cab, the front windshield 10 is arranged at the front end of the cab, the driver is located in the cab, and the driver can observe the road in front of the vehicle through the front windshield 10 to drive. The instrument panel 20 is arranged in the cab, and the instrument panel 20 is located in front of the driver, and a dashboard is arranged on the instrument panel 20, and the dashboard is used to display the driving data of the vehicle. The head-up display system is arranged in the cab, and the head-up display system can project the driving data of the vehicle on the front windshield 10, so that the driver can obtain the driving data of the vehicle through the projection on the front windshield 10, and the acquisition of driving data is more direct and convenient, which improves the driving experience; in addition, the driver does not need to obtain driving data by observing the instrument panel, thereby preventing the driver's eyes from deviating from the road ahead, and improving driving safety.

[0053] It is understandable that driving data may include vehicle speed, engine speed, fuel level, coolant temperature, navigation information, etc.; the embodiment of the present application does not limit the driving data, and the driving data can be reasonably set according to actual usage needs.

[0054] Continue to refer to Figure 1In some embodiments, the electronic device 1 can be arranged in the dashboard 20. Accordingly, a projection window is arranged on the dashboard 20. The electronic device 1 can emit light through the projection window to the front windshield 10, thereby projecting the driving data on the front windshield 10. In this way, the electronic device 1 is arranged in the dashboard 20 and does not occupy the space in the cab. In addition, the distance between the dashboard 20 and the front windshield 10 is small, which can prevent objects in the cab from blocking the light.

[0055] In other embodiments, the electronic device 1 may be located on the top of the cab, and the electronic device is connected to the vehicle body. For example, the vehicle body may include a roof located on the top of the cab, and a skylight may be provided on the roof, and the corresponding electronic device 1 may be provided on the roof. In this arrangement, the electronic device 1 is located on the top of the cab, which facilitates the installation and maintenance of the electronic device 1 compared to installing it in the dashboard 20.

[0056] In the implementation of the electronic device 1 applied to the head-up display system, the head-up display system can be an augmented reality head-up display (AR-HUD) to improve the driving experience. Of course, the electronic device in the embodiment of the present application is not limited to the application in the head-up display scenario, but can also be applied to scenarios such as vehicle-mounted smart cockpits or vehicle-mounted projection. The embodiment of the present application does not limit the application scenario of the electronic device 1.

[0057] Please refer to Figure 2 In the embodiment of the present application, the electronic device includes a housing and an imaging module 100, and the imaging module 100 is arranged on the housing. The imaging module 100 is used for imaging, and the housing can fix the imaging module 100.

[0058] In the above implementation, the imaging module 100 includes a display device 130, an aperture 104, a first lens assembly 110, and a second lens assembly 120. The aperture 104 and the display device 130 are arranged along an optical axis ( Figure 2 The display device 130 is used to display an image. The first lens assembly 110 and the second lens assembly 120 are both arranged on the optical axis, and the first lens assembly 110 is arranged on the image side of the aperture 104, that is, the first lens assembly 110 is located on the side of the aperture 104 away from the display device 130; the second lens assembly 120 is located on the object side of the aperture 104, that is, the second lens assembly 120 is located between the aperture 104 and the display device 130.

[0059] When the imaging module 100 is working, the image displayed by the display device 130 is projected onto the outside of the electronic device after passing through the second lens assembly 120, the aperture 104, and the first lens assembly 110 in sequence; illustratively, in an implementation method in which the electronic device includes a head-up display system, the image displayed by the display device 130 is projected onto the outside of the electronic device. Figure 1 On the front windshield 10 shown, in an implementation in which the electronic device includes a projector, the image displayed by the display device 130 is projected onto a screen; in an implementation in which the electronic device includes AR or VR, the image displayed by the display device 130 is projected in front of the human eye to provide an immersive user experience.

[0060] The aperture 104 is used to limit the light emitted from the second lens assembly 120 to the first lens assembly 110. Exemplarily, the aperture 104 may be an aperture aperture, and accordingly, the aperture 104 limits the amount of light received by the first lens assembly 110; or, the aperture 104 is a field of view aperture, and accordingly, the aperture 104 is used to limit the size of the field of view. The display device 130 may include a display chip, a liquid crystal display panel (LCD), an organic light-emitting diode display panel (OLED), and other devices capable of displaying images. The embodiment of the present application does not limit the display device 130.

[0061] In the above implementation, the first lens assembly 110 includes a first lens 101, a second lens 102, and a third lens 103 arranged along the optical axis direction, and the first lens 101, the second lens 102, and the third lens 103 are arranged in sequence and spaced in a direction close to the aperture 104; that is, the second lens 102 is located between the first lens 101 and the third lens 103, and the first lens 101 is arranged away from the aperture 104, and the third lens 103 is arranged close to the aperture 104, and the light from the aperture 104 is sequentially transmitted through the third lens 103, the second lens 102, and the first lens 101 and then emitted to the outside of the electronic device.

[0062] In the embodiment of the present application, the focal power of the first lens 101 and the third lens 103 is negative, and the focal power of the second lens 102 is positive, so that the focal power of the first lens assembly 110 is positive, that is, the total focal power of the first lens 101, the second lens 102 and the third lens 103 is positive. In other words, the first lens assembly 110 has the function of converging the light from the aperture 104. It can be understood that the focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, which characterizes the ability of the optical system to deflect light. If the focal power is positive, the corresponding lens has the function of converging light; on the contrary, if the focal power is negative, the lens has the function of diverging light.

[0063] The embodiment of the present application does not limit the specific values ​​of the optical powers of the first lens 101, the second lens 102 and the third lens 103, as long as the optical powers of the first lens 101 and the third lens 103 are negative and the optical power of the second lens 102 is positive, so that the optical power of the first lens assembly 110 is positive.

[0064] Continue to refer to Figure 2 In the embodiment of the present application, the second lens assembly 120 includes a fourth lens 105, a fifth lens 106, a sixth lens 107, and a seventh lens 108 arranged along the optical axis, and the fourth lens 105, the fifth lens 106, the sixth lens 107, and the seventh lens 108 are arranged in sequence and spaced in a direction away from the aperture 104; that is, the fourth lens 105 is arranged close to the aperture 104, the seventh lens 108 is arranged close to the display device 130, the fifth lens 106 and the sixth lens 107 are arranged between the fourth lens 105 and the seventh lens 108, and the fifth lens 106 is arranged close to the fourth lens 105, and the sixth lens 107 is arranged close to the seventh lens 108. When working, the light emitted by the display device 130 passes through the seventh lens 108, the sixth lens 107, the fifth lens 106, and the fourth lens 105 in sequence and then enters the aperture 104, and then the light is emitted through the first lens assembly 110.

[0065] In the above implementation, the optical power of the fourth lens 105 is negative, and the optical powers of the fifth lens 106, the sixth lens 107, and the seventh lens 108 are all positive. Accordingly, the optical power of the second lens assembly 120 can be positive or negative. It can be understood that the embodiment of the present application does not limit the specific values ​​of the optical power of the fourth lens 105, the fifth lens 106, the sixth lens 107, and the seventh lens 108. By reasonably setting the optical power values ​​of the fourth lens 105, the fifth lens 106, the sixth lens 107, and the seventh lens 108, the optical power value and the positive and negative of the second lens assembly 120 can be adjusted.

[0066] In the embodiment of the present application, each lens has a light incident surface and a light emitting surface, and the light incident surface and / or the light emitting surface of each lens is a curved surface, and the curved surface is a spherical surface. With such an arrangement, the shape of each lens is regular, which reduces the difficulty of manufacturing the lens.

[0067] Continue to refer to Figure 2 In some embodiments, the imaging module 100 further includes a beam splitter prism 109, which is disposed between the second lens assembly 120 and the display device 130. In this configuration, the beam splitter prism 109 can separate the polarized light required for projection from other polarized light, thereby allowing the polarized light required for projection to be projected toward the second lens assembly 120, avoiding interference from other polarized light, thereby improving the imaging quality (such as clarity, contrast, etc.) of the imaging module 100.

[0068] In the imaging module 100 provided in the embodiment of the present application, the aperture 104 and the display device 130 are arranged at intervals, the first lens assembly 110 is arranged on the image side of the aperture 104, and the optical focal length of the first lens assembly 110 is positive; the first lens assembly 110 includes a first lens 101, a second lens 102 and a third lens 103 which are arranged in sequence in a direction close to the aperture 104, the optical focal lengths of the first lens 101 and the third lens 103 are negative, and the optical focal length of the second lens 102 is positive; the second lens assembly 120 is arranged on the object side of the aperture 104, and the second lens assembly 120 includes a fourth lens 105, a fifth lens 106, a sixth lens 107 and a seventh lens 108 which are arranged in sequence in a direction away from the aperture 104, the optical focal length of the fourth lens 105 is negative, and the optical focal lengths of the fifth lens 106, the sixth lens 107 and the seventh lens 108 are all positive. In the embodiment of the present application, the spacing between adjacent lenses can avoid cracking of the connecting glue due to vibration, thereby improving the reliability of the imaging module 100, compared with connecting two adjacent lenses together with a connecting glue.

[0069] Please refer to Figure 3 In some embodiments, the focal length f of the imaging module 100 satisfies: 12.5 mm ≤ f ≤ 15 mm; it can be understood that the imaging module 100 satisfies:

[0070]

[0071] Among them, BFL is the shortest distance between the display device 130 and the light incident surface of the seventh lens 108, and L is the shortest distance between the light exit surface of the first lens 101 and the projection image plane 140 (when the electronic device is a head-up display system, the distance is the shortest distance between the first lens 101 and the front windshield 10, and when the electronic device is a projector, the distance is the shortest distance between the first lens 101 and the screen). It can be seen from the above formula that when the shortest distance BFL between the display device 130 and the light incident surface of the seventh lens 108 is the same, the focal length f satisfies: 12.5mm≤f≤15mm, and the focal length f is moderate, so that the focal length of the imaging component is not too large, thereby avoiding the shortest distance between the light exit surface of the first lens 101 and the projection image plane 140 being too large; at the same time, it can also avoid the focal length of the imaging component being too small, thereby avoiding the shortest distance between the light exit surface of the first lens 101 and the projection image plane 140 being too small.

[0072] In some implementations, the distance L between the first lens 101 and the image plane of the imaging module 100 satisfies: 100mm≤L≤150mm. This arrangement makes the distance between the imaging module 100 and the projection image plane 140 smaller, thereby preventing foreign objects from entering between the imaging module 100 and the projection image plane 140 to avoid blocking light; in addition, the size of the entire optical system (including the projection image plane 140 and the imaging module 100) is also reduced.

[0073] In some implementations, the distance BFL between the surface of the seventh lens 108 facing the display device 130 (light incident surface) and the display device 130 satisfies: 20 mm ≤ BFL ≤ 30 mm. This arrangement makes the distance between the seventh lens 108 and the display device 130 smaller, thereby reducing the length of the imaging module 100 along the optical axis, and realizing the miniaturization of the imaging module 100 and the electronic device.

[0074] It is understandable that according to It can be seen that by reasonably setting the values ​​of f, BFL, and L, the length of the imaging module 100 along the optical axis can be reduced while ensuring the imaging quality, thereby miniaturizing the imaging module 100 and the electronic device, and also reducing the shortest distance between the light-emitting surface of the first lens 101 and the projection image plane 140. The embodiments of the present application do not limit the values ​​of f, BFL, and L.

[0075] In some embodiments, the length (total optical length) TTL of the imaging module 100 along the optical axis satisfies: 67 mm ≤ TTL ≤ 77 mm. This arrangement can further reduce the length of the imaging module 100 along the optical axis to reduce the size of the imaging module 100 and the electronic device.

[0076] In the embodiment of the present application, the aperture coefficient Fno of the imaging module 100 satisfies: Fno ≥ 2.3. The aperture coefficient Fno is the relative value of the ratio of the focal length of the imaging module 100 to the light passing diameter of the imaging module 100 (the inverse of the relative aperture). The smaller the aperture coefficient Fno, the more light passing in the same unit time, and the larger the aperture coefficient Fno, the less light passing in the same unit time. By making the aperture coefficient Fno of the imaging module 100 satisfy: Fno ≥ 2.3, it is possible to ensure that the imaging module 100 has a large light passing amount while avoiding the focal length of the imaging module 100 being too large or the light passing diameter of the imaging module 100 being too small.

[0077] In the above implementation, the focal length f1 of the first lens 101 satisfies: -57≤f1≤-75, the focal length f2 of the second lens 102 satisfies: 25≤f2≤40, and the focal length f3 of the third lens 103 satisfies: -17≤f3≤-30. In this way, the focal length of the first lens assembly 110 is moderate while ensuring that the optical power of the first lens assembly 110 is positive.

[0078] In the above implementation, the focal length f4 of the fourth lens 105 satisfies: -18≤f4≤-8, the focal length f5 of the fifth lens 106 satisfies: 10≤f5≤30, the focal length f6 of the sixth lens 107 satisfies: 18≤f6≤40, and the focal length f7 of the seventh lens 108 satisfies: 30≤f7≤40. With such an arrangement, the optical power of the second lens assembly 120 is positive, and the second lens assembly 120 can converge the light from the display device 130, thereby preventing the focal length of the first lens assembly 110 from being too small.

[0079] In the embodiment of the present application, the aperture D1 of the first lens 101 satisfies: 21mm≤D1≤26mm, so that the first lens 101 can have a large enough aperture to meet the requirement of sufficient light transmission. It is understandable that the aperture of each lens can be reasonably set according to the actual use needs, and the embodiment of the present application does not limit the aperture of each lens. Exemplarily, the radius of the light-emitting surface of the first lens 101 can be greater than 40.1mm and less than 70.5mm, and the radius of the light-entering surface of the first lens 101 can be greater than 17.5mm and less than 30mm.

[0080] The following will introduce the parameters of each lens in the imaging system and the parameters of the imaging system with multiple examples:

[0081] Example 1

[0082] The parameters of each lens in the imaging system and the parameters of the imaging system are shown in the table below, where R is the radius of curvature, TH is the surface thickness (the distance from the surface to the previous surface), Nd is the refractive index of the material, and Vd is the Abbe number of the material. In Table 1A, OBJ is Figure 3The projection image plane 140 shown in the figure, S1 is the light exit surface of the first lens 101, the TH corresponding to the corresponding OBJ is the distance between the projection image plane 140 and S1, similarly, the other THs are the distances between the corresponding surface and the previous surface along the light propagation direction, the Nd and Vd corresponding to s1 are the Nd and Vd of the first lens 101 respectively; S2 is the light incident surface of the first lens 101, S3 is the light exit surface of the second lens 102, S4 is the light incident surface of the second lens 102, S5 is the light exit surface of the third lens 103, and S6 is the light incident surface of the third lens 103. S7 is the light incident surface of the lens 103, S8 is the light exit surface of the fourth lens 105, S9 is the light incident surface of the fourth lens 105, S10 is the light exit surface of the fifth lens 106, S11 is the light incident surface of the fifth lens 106, S12 is the light exit surface of the sixth lens 107, S13 is the light incident surface of the sixth lens 107, S14 is the light exit surface of the seventh lens 108, S15 is the light incident surface of the seventh lens 108, S16 is the light exit surface of the dichroic prism 109, and S17 is the light incident surface of the dichroic prism 109.

[0083] In some implementations, a liquid crystal layer may be provided between the display device 130 and the beam splitter prism 109, and the amount of light passing between the display device 130 and the beam splitter prism 109 may be controlled by controlling the deflection of liquid crystal molecules in the liquid crystal layer. A first protective glass layer is provided on the light-exiting side of the liquid crystal layer, and a second protective glass layer is provided on the light-incoming side of the liquid crystal layer. Accordingly, in Table 1A, s18 is the light-exiting surface of the first protective glass layer, S19 is the light-exiting surface of the second protective glass layer, and S20 is the light-exiting surface of the display device 130.

[0084] It can be understood that the infinite radius of curvature in Table 1A can be understood to mean that the surface is a plane or a nearly plane.

[0085] Table 1A

[0086]

[0087] In Table 1B, f1 is Figure 3 The focal length of the first lens 101 is shown, f2 is the focal length of the second lens 102, f3 is the focal length of the third lens 103, f4 is the focal length of the fourth lens 105, f5 is the focal length of the fifth lens 106, f6 is the focal length of the sixth lens 107, f7 is the focal length of the seventh lens 108, EFL is the focal length of the imaging module 100, TTL is the total optical length of the imaging module 100, ImgH is half of the diagonal length of the effective pixel area (area for displaying images) on the display device 130, D1 is the aperture of the first lens 101, Fno is the aperture coefficient, BFL is the distance between the surface of the seventh lens 108 facing the display device 130 (light incident surface) and the display device 130 (back focal length), and R1 is the radius of the light emitting surface of the first lens 101.

[0088] Table 1B

[0089] f1(mm) -62.779 R1(mm) 49.478 f2(mm) 30.845 EFL(mm) 14.84 f3(mm) -22.035 TTL(mm) 72.5 f4(mm) -13.075 ImgH(mm) 4.6 f5(mm) 21.680 D1(mm) 24.28 f6(mm) 23.090 Fno 2.4 f7(mm) 35.508 BFL(mm) 25.4

[0090] Figure 4 It is the spherical aberration diagram of the imaging module 100 in this example, the ordinate is the normalized aperture, and the abscissa is the defocus distance (the distance from the optical axis). The curves a1, a2, and a3 in the figure correspond to the vertical axis spherical aberration of light of different wavelengths after passing through the imaging module 100. Exemplarily, the wavelength of light corresponding to a1 can be 625nm, the wavelength of light corresponding to a2 can be 550nm, and the wavelength of light corresponding to a3 can be 455nm. It can be seen from the figure that the vertical axis spherical aberration of the imaging module 100 is small, that is, the deviation between the projection image plane 140 of the imaging module 100 and the optimal image plane is small, so that the imaging module 100 has a higher definition.

[0091] Figure 5 : is the astigmatism field curvature diagram of the imaging module 100 in this example, the horizontal axis is the defocus distance, and the vertical axis is the projection object field of view. The solid line S is the field curvature of the light with a central wavelength of 550nm on the meridional image plane, and the dotted line T is the field curvature of the light with a central wavelength of 555nm on the sagittal image plane. It can be seen from the figure that the dispersion of the two curves is small, the astigmatism of the imaging module 100 is small, and the dispersion is low, so that the clarity of the imaging module 100 is higher.

[0092] Figure 6 This is the distortion diagram of the imaging module 100 in this example. The horizontal axis is the distortion value, that is, the deformation percentage of the image formed by the imaging module 100 relative to the standard image, and the vertical axis is the projection object field of view. The curve in the figure is the distortion of light with a central wavelength of 550nm after passing through the imaging module 100. It can be seen from the figure that the distortion of the imaging module 100 is small.

[0093] Figure 7 This is the relative illumination diagram of the imaging module 100 in this example. The horizontal axis is the distance between the point on the image plane and the center of the image plane, and the vertical axis is the brightness ratio relative to the central field of view (center of the image). It can be seen from the figure that the brightness of each point on the image plane is relatively high (all higher than 90% of the brightness of the central field of view), and as the distance gradually increases, the brightness of the point on the image plane gradually increases. The brightness of the image formed by the imaging module 100 is relatively high and the brightness is relatively uniform.

[0094] Example 2

[0095] The meanings of the data in Table 2A and Table 2B are roughly the same as those in Example 1, and will not be repeated here with reference to Example 1.

[0096] Table 2A

[0097]

[0098] Table 2B

[0099]

[0100]

[0101] Figure 8 It is the spherical aberration diagram of the imaging module 100 in this example, the ordinate is the normalized aperture, and the abscissa is the defocus distance (the distance from the optical axis). The curves a1, a2, and a3 in the figure correspond to the vertical axis spherical aberration of light of different wavelengths after passing through the imaging module 100. Exemplarily, the wavelength of light corresponding to a1 can be 625nm, the wavelength of light corresponding to a2 can be 550nm, and the wavelength of light corresponding to a3 can be 455nm. It can be seen from the figure that the vertical axis spherical aberration of the imaging module 100 is small, that is, the deviation between the projection image plane 140 of the imaging module 100 and the optimal image plane is small, so that the imaging module 100 has a higher definition.

[0102] Fig. 9 : is the astigmatism field curvature diagram of the imaging module 100 in this example, the horizontal axis is the defocus distance, and the vertical axis is the projection object field of view. The solid line S is the field curvature of the light with a central wavelength of 550nm on the meridional image plane, and the dotted line T is the field curvature of the light with a central wavelength of 555nm on the sagittal image plane. It can be seen from the figure that the dispersion of the two curves is small, the astigmatism of the imaging module 100 is small, and the dispersion is low, so that the clarity of the imaging module 100 is higher.

[0103] Fig.10 This is the distortion diagram of the imaging module 100 in this example. The horizontal axis is the distortion value, that is, the deformation percentage of the image formed by the imaging module 100 relative to the standard image, and the vertical axis is the projection object field of view. The curve in the figure is the distortion of light with a central wavelength of 550nm after passing through the imaging module 100. It can be seen from the figure that the distortion of the imaging module 100 is small.

[0104] Fig.11 This is the relative illumination diagram of the imaging module 100 in this example. The horizontal axis is the distance between the point on the image plane and the center of the image plane, and the vertical axis is the brightness ratio relative to the central field of view (center of the image). It can be seen from the figure that the brightness of each point on the image plane is relatively high (all higher than 90% of the brightness of the central field of view), and as the distance gradually increases, the brightness of the point on the image plane gradually increases. The brightness of the image formed by the imaging module 100 is relatively high and the brightness is relatively uniform.

[0105] Example 3

[0106] The meanings of the data in Table 3A and Table 3B are roughly the same as those in Example 1, and will not be repeated here with reference to Example 1.

[0107] Table 3A

[0108]

[0109] Table 3B

[0110]

[0111]

[0112] Fig.12 It is the spherical aberration diagram of the imaging module 100 in this example, the ordinate is the normalized aperture, and the abscissa is the defocus distance (the distance from the optical axis). The curves a1, a2, and a3 in the figure correspond to the vertical axis spherical aberration of light of different wavelengths after passing through the imaging module 100. Exemplarily, the wavelength of light corresponding to a1 can be 625nm, the wavelength of light corresponding to a2 can be 550nm, and the wavelength of light corresponding to a3 can be 455nm. It can be seen from the figure that the vertical axis spherical aberration of the imaging module 100 is small, that is, the deviation between the projection image plane 140 of the imaging module 100 and the optimal image plane is small, so that the imaging module 100 has a higher definition.

[0113] Fig.13 : is the astigmatism field curvature diagram of the imaging module 100 in this example, the horizontal axis is the defocus distance, and the vertical axis is the projection object field of view. The solid line S is the field curvature of the light with a central wavelength of 550nm on the meridional image plane, and the dotted line T is the field curvature of the light with a central wavelength of 555nm on the sagittal image plane. It can be seen from the figure that the dispersion of the two curves is small, the astigmatism of the imaging module 100 is small, and the dispersion is low, so that the clarity of the imaging module 100 is higher.

[0114] Fig.14 This is the distortion diagram of the imaging module 100 in this example. The horizontal axis is the distortion value, that is, the deformation percentage of the image formed by the imaging module 100 relative to the standard image, and the vertical axis is the projection object field of view. The curve in the figure is the distortion of light with a central wavelength of 550nm after passing through the imaging module 100. It can be seen from the figure that the distortion of the imaging module 100 is small.

[0115] Fig.15 This is the relative illumination diagram of the imaging module 100 in this example. The horizontal axis is the distance between the point on the image plane and the center of the image plane, and the vertical axis is the brightness ratio relative to the central field of view (center of the image). It can be seen from the figure that the brightness of each point on the image plane is relatively high (all higher than 90% of the brightness of the central field of view), and as the distance gradually increases, the brightness of the point on the image plane gradually increases. The brightness of the image formed by the imaging module 100 is relatively high and the brightness is relatively uniform.

[0116] Example 4

[0117] The meanings of the data in Table 4A and Table 4B are roughly the same as those in Example 1, and will not be repeated here with reference to Example 1.

[0118] Table 4A

[0119]

[0120]

[0121] Table 4B

[0122] f1(mm) -62.779 f2(mm) 30.845 EFL(mm) 14.8436 f3(mm) -22.035 TTL(mm) 72.5 f4(mm) -13.075 ImgH(mm) 4.6 f5(mm) 21.680 D1(mm) 24.3 f6(mm) 23.090 Fno 2.4 f7(mm) 35.508 BFL(mm) 25.4

[0123] Fig.16 It is the spherical aberration diagram of the imaging module 100 in this example, the ordinate is the normalized aperture, and the abscissa is the defocus distance (the distance from the optical axis). The curves a1, a2, and a3 in the figure correspond to the vertical axis spherical aberration of light of different wavelengths after passing through the imaging module 100. Exemplarily, the wavelength of light corresponding to a1 can be 625nm, the wavelength of light corresponding to a2 can be 550nm, and the wavelength of light corresponding to a3 can be 455nm. It can be seen from the figure that the vertical axis spherical aberration of the imaging module 100 is small, that is, the deviation between the projection image plane 140 of the imaging module 100 and the optimal image plane is small, so that the imaging module 100 has a higher definition.

[0124] Fig.17 : is the astigmatism field curvature diagram of the imaging module 100 in this example, the horizontal axis is the defocus distance, and the vertical axis is the projection object field of view. The solid line S is the field curvature of the light with a central wavelength of 550nm on the meridional image plane, and the dotted line T is the field curvature of the light with a central wavelength of 555nm on the sagittal image plane. It can be seen from the figure that the dispersion of the two curves is small, the astigmatism of the imaging module 100 is small, and the dispersion is low, so that the clarity of the imaging module 100 is higher.

[0125] Fig.18 This is the distortion diagram of the imaging module 100 in this example. The horizontal axis is the distortion value, that is, the deformation percentage of the image formed by the imaging module 100 relative to the standard image, and the vertical axis is the projection object field of view. The curve in the figure is the distortion of light with a central wavelength of 550nm after passing through the imaging module 100. It can be seen from the figure that the distortion of the imaging module 100 is small.

[0126] Fig.19 This is the relative illumination diagram of the imaging module 100 in this example. The horizontal axis is the distance between the point on the image plane and the center of the image plane, and the vertical axis is the brightness ratio relative to the central field of view (center of the image). It can be seen from the figure that the brightness of each point on the image plane is relatively high (all higher than 90% of the brightness of the central field of view), and as the distance gradually increases, the brightness of the point on the image plane gradually increases. The brightness of the image formed by the imaging module 100 is relatively high and the brightness is relatively uniform.

[0127] Example 5

[0128] The meanings of the data in Table 5A and Table 5B are roughly the same as those in Example 1, and will not be repeated here with reference to Example 1.

[0129] Table 5A

[0130]

[0131]

[0132] Table 5B

[0133] f1(mm) -70.045 f2(mm) 35.749 EFL(mm) 14.6498 f3(mm) -22.047 TTL(mm) 71.9786 f4(mm) -12.953 ImgH(mm) 4.6 f5(mm) 15.207 D1(mm) 24.4 f6(mm) 36.878 Fno 2.4 f7(mm) 35.332 BFL(mm) 25.4

[0134] Fig. 20 It is the spherical aberration diagram of the imaging module 100 in this example, the ordinate is the normalized aperture, and the abscissa is the defocus distance (the distance from the optical axis). The curves a1, a2, and a3 in the figure correspond to the vertical axis spherical aberration of light of different wavelengths after passing through the imaging module 100. Exemplarily, the wavelength of light corresponding to a1 can be 625nm, the wavelength of light corresponding to a2 can be 550nm, and the wavelength of light corresponding to a3 can be 455nm. It can be seen from the figure that the vertical axis spherical aberration of the imaging module 100 is small, that is, the deviation between the projection image plane 140 of the imaging module 100 and the optimal image plane is small, so that the imaging module 100 has a higher definition.

[0135] Fig.21 : is the astigmatism field curvature diagram of the imaging module 100 in this example, the horizontal axis is the defocus distance, and the vertical axis is the projection object field of view. The solid line S is the field curvature of the light with a central wavelength of 550nm on the meridional image plane, and the dotted line T is the field curvature of the light with a central wavelength of 555nm on the sagittal image plane. It can be seen from the figure that the dispersion of the two curves is small, the astigmatism of the imaging module 100 is small, and the dispersion is low, so that the clarity of the imaging module 100 is higher.

[0136] Fig. 22 This is the distortion diagram of the imaging module 100 in this example. The horizontal axis is the distortion value, that is, the deformation percentage of the image formed by the imaging module 100 relative to the standard image, and the vertical axis is the projection object field of view. The curve in the figure is the distortion of light with a central wavelength of 550nm after passing through the imaging module 100. It can be seen from the figure that the distortion of the imaging module 100 is small.

[0137] Fig.23 This is the relative illumination diagram of the imaging module 100 in this example. The horizontal axis is the distance between the point on the image plane and the center of the image plane, and the vertical axis is the brightness ratio relative to the central field of view (center of the image). It can be seen from the figure that the brightness of each point on the image plane is relatively high (all higher than 90% of the brightness of the central field of view), and as the distance gradually increases, the brightness of the point on the image plane gradually increases. The brightness of the image formed by the imaging module 100 is relatively high and the brightness is relatively uniform.

[0138] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An imaging module, characterized in that: include: Display device; An aperture, wherein the aperture and the display device are arranged spaced apart along the optical axis; a first lens assembly, the first lens assembly is arranged on the image side of the aperture, and the optical power of the first lens assembly is positive; the first lens assembly comprises a first lens, a second lens, and a third lens which are sequentially arranged in a direction close to the aperture, the optical power of the first lens and the third lens is negative, and the optical power of the second lens is positive; A second lens assembly, wherein the second lens assembly is arranged on the object side of the aperture, and the second lens assembly comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially spaced apart in a direction away from the aperture, wherein the optical focal length of the fourth lens is negative, and the optical focal lengths of the fifth lens, the sixth lens and the seventh lens are all positive.

2. The imaging module according to claim 1, characterized in that: The focal length f of the imaging module satisfies: 12.5mm≤f≤15mm.

3. The imaging module according to claim 1 or 2, characterized in that: The distance L between the first lens and the image plane of the imaging module satisfies: 100mm≤L≤150mm.

4. The imaging module according to any one of claims 1 to 3, characterized in that: A distance BFL between a surface of the seventh lens facing the display device and the display device satisfies: 20 mm≤BFL≤30 mm.

5. The imaging module according to any one of claims 1 to 4, characterized in that: The length TTL of the imaging module along the optical axis direction satisfies: 67mm≤TTL≤77mm.

6. The imaging module according to any one of claims 1 to 5, characterized in that: The aperture coefficient Fno of the imaging module satisfies: Fno≥2.

3.

7. The imaging module according to any one of claims 1 to 6, characterized in that: The focal length f1 of the first lens satisfies: -57≤f1≤-75, the focal length f2 of the second lens satisfies: 25≤f2≤40, and the focal length f3 of the third lens satisfies: -17≤f3≤-30.

8. The imaging module according to any one of claims 1 to 7, characterized in that: The focal length f4 of the fourth lens satisfies: -18≤f4≤-8, the focal length f5 of the fifth lens satisfies: 10≤f5≤30, the focal length f6 of the sixth lens satisfies: 18≤f6≤40, and the focal length f7 of the seventh lens satisfies: 30≤f7≤40.

9. The imaging module according to any one of claims 1 to 8, characterized in that: The imaging module further includes a beam splitter prism, and the beam splitter prism is located between the second lens assembly and the display device.

10. An electronic device, characterized in that: include: A casing, and an imaging module as described in any one of claims 1 to 9, wherein the imaging module is arranged on the casing.

11. A vehicle, characterized in that: include: A vehicle body, a front windshield, and the electronic device as claimed in claim 10, wherein the vehicle body is enclosed to form a cab, the front windshield is arranged at the front end of the cab; the electronic device is arranged in the cab, and the electronic device is used to project driving data onto the front windshield.

12. The vehicle according to claim 11, characterized in that The vehicle further includes a dashboard, which is disposed in the cab, and the electronic device is disposed in the dashboard.

13. The vehicle according to claim 11, characterized in that The electronic device is located on the top of the cab, and the electronic device is arranged on the vehicle body.

Images