An imaging lens module, a projection display device and a vehicle-mounted projection system

Abstract

Embodiments of the present application provide an imaging lens module, a projection display device and a vehicle-mounted projection system. The imaging lens module comprises, in order from a projection surface side to an image source side along an optical axis direction, a fixed assembly, a diaphragm, a movable compensation assembly and an equivalent prism assembly. The movable compensation assembly is configured to be movable along the optical axis. An axial distance T1 between the projection surface and the fixed assembly is continuously variable and satisfies 130mm≤T1≤1500mm. When T1 changes, an axial distance T3 between the diaphragm and the movable compensation assembly and an axial distance T4 between the movable compensation assembly and the equivalent prism assembly change correspondingly and satisfy a relationship (T3'+T4') / (T3+T4)=1, where T3' and T4' are the changed T3 and T4 respectively.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and more specifically, to an imaging lens module, a projection display device, and a vehicle-mounted projection system. Background Technology

[0002] With the rapid development of automotive intelligence and cockpit electronics, in-vehicle projection display systems, such as digital light processing (DLP) ground lights, in-vehicle ambient projection, and head-up displays (HUDs), have become key features for enhancing human-machine interaction and driving safety. These systems can present clear information and images on different surfaces or in different spaces, greatly enhancing the interaction between the vehicle and the driver, passengers, and the surrounding environment.

[0003] However, most existing in-vehicle projection display devices are typically designed based on a fixed or limited number of discrete projection distances. In practical applications, not only do different functions (such as near-field ground illumination and far-field HUD) require significantly different projection distances, but the same function often requires flexible adjustment of the projection distance depending on different vehicle models, installation locations, or user preferences. The current fixed projection distance solution makes it difficult for a single device to adapt to diverse driving scenarios and usage needs, thus limiting the optimization of display effects and further improvement of user experience.

[0004] Therefore, there is an urgent need in the field for an imaging lens module and projection display device that can continuously and stably adjust the projection distance over a wide range while maintaining high imaging quality, compact structure, and suitability for vehicle environments, in order to overcome the limitations of the existing technology where the projection distance is fixed and cannot be continuously adjusted. Summary of the Invention

[0005] The purpose of this application is to provide a new technical solution for an imaging lens module, a projection display device, and an in-vehicle projection system, which can realize continuous adjustment of the projection distance over a wide range, so as to overcome the problems of fixed projection distance or limited adjustment range in the prior art, which makes it difficult to adapt to different in-vehicle application scenarios.

[0006] In a first aspect, this application provides an imaging lens module. The imaging lens module includes, in sequence along the optical axis from the projection surface side to the image source side, a fixed component, an aperture, a movable compensation component, and an equivalent prism component, wherein the movable compensation component is configured to be movable along the optical axis; The axial distance T1 between the projection surface and the fixed component can be continuously varied and satisfies: 130mm≤T1≤1500mm; when T1 changes, the axial distance T3 between the aperture and the movable compensation component, and the axial distance T4 between the movable compensation component and the equivalent prism component change accordingly and satisfy the relationship: (T3'+T4') / (T3+T4)=1, where T3' and T4' are the changed T3 and T4, respectively.

[0007] Optionally, the fixing component includes a first lens and a second lens arranged sequentially along the optical axis from the projection surface side to the image source side, wherein the first lens has negative optical power and at least one optical surface is aspherical, and the second lens has positive optical power.

[0008] Optionally, the movable compensation component includes a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the projection side to the image source side. The third lens has negative optical power, the fourth lens has positive optical power, and the fifth lens has positive optical power and at least one optical surface is aspherical.

[0009] Optionally, the third lens and the fourth lens are cemented together to form a cemented lens.

[0010] Optionally, the axial distance T2 between the fixing component and the aperture is a fixed value, and satisfies: 2.5mm≤T2≤4.0mm.

[0011] Optionally, the imaging lens module further includes an image generating component disposed on the image source side of the equivalent prism assembly, wherein the axial distance T5 between the equivalent prism assembly and the image generating component is a fixed value and satisfies: 1.0mm≤T5≤2.0mm.

[0012] Optionally, the pupil diameter D of the imaging lens module and the effective focal length EFL satisfy: EFL / D≤2.45.

[0013] Optionally, the total length (TTL) and effective focal length (EFL) of the imaging lens module satisfy the following condition: TTL / EFL < 4.5.

[0014] Optionally, the refractive index Nd and Abbe number Vd of each lens material satisfy: The first lens satisfies: Nd1 < 1.60, Vd1 > 50; The second lens satisfies: Nd2 < 1.75, Vd2 < 45; The third lens satisfies: Nd3 > 1.75, Vd3 < 40; The fourth lens satisfies: Nd4 < 1.75, Vd4 > 45; The fifth lens satisfies: Nd5 < 1.60, Vd5 > 50.

[0015] Optionally, the aspherical surface profiles of the first lens and the fifth lens are defined by the following formula: Z(h) = ch 2 / [1+1 (1+k)c 2 h 2 ] 1 / 2 +Ah 2 +Bh 4 +Ch 6 +Dh 8 +Eh 10 +Fh 12 +Gh 14 +Hh 16 ; Where Z(h) is the sag of the distance between the aspherical surface and the vertex of the aspherical surface at a height of h along the optical axis, c=1 / r, r is the radius of curvature, k is the conic coefficient, and A, B, C, D, E, F, G, and H are the coefficients of higher-order terms of the aspherical surface.

[0016] Optionally, the first lens and the fifth lens are aspherical lenses; The second lens, the third lens, and the fourth lens are spherical lenses.

[0017] Secondly, this application provides a projection display device, the projection display device comprising: The imaging lens module described in the first aspect; and... A drive mechanism for moving the movable compensation component along the optical axis.

[0018] Secondly, this application provides a vehicle-mounted projection system, the vehicle-mounted projection system comprising: The projection display device as described in the second aspect, wherein the projection display device is used for in-vehicle projection, HUD display or DLP ground illumination.

[0019] The beneficial effects of this application are as follows: The imaging lens module provided in this application embodiment achieves continuous and stable adjustment of the projection distance T1 between 130mm and 1500mm by controlling the movable compensation component to move along the optical axis and keeping the sum of distances T3 and T4 constant during its movement. This structure allows the same imaging lens module to automatically adapt to various projection scenarios, from near-field ground illumination to far-field information display, without the need for replacement or complex reconfiguration. It fundamentally overcomes the problems of limited device functionality and poor environmental adaptability caused by fixed projection distances in existing technologies, significantly enhancing the applicability and user experience of vehicle-mounted projection systems in different driving environments.

[0020] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0022] Figure 1 This is a schematic diagram of the structure and optical path of the imaging lens module provided in the embodiments of this application; Figure 2 A schematic diagram of the fixed component and the movable compensation component of the imaging lens module provided in the embodiments of this application; Figure 3 This is one of the MTF curves of the imaging lens module provided in Embodiment 1 of this application; Figure 4 This is one of the field curvature distortion diagrams of the imaging lens module provided in Embodiment 1 of this application; Figure 5 This is the second MTF curve of the imaging lens module provided in Embodiment 1 of this application; Figure 6 This is the second field curvature distortion diagram of the imaging lens module provided in Embodiment 1 of this application; Figure 7 The third MTF curve of the imaging lens module provided in Embodiment 1 of this application; Figure 8 This is the third field curvature distortion diagram of the imaging lens module provided in Embodiment 1 of this application; Figure 9 The fourth MTF curve of the imaging lens module provided in Embodiment 1 of this application; Figure 10 This is the fourth field curvature distortion diagram of the imaging lens module provided in Embodiment 1 of this application; Figure 11 The fifth MTF curve of the imaging lens module provided in Embodiment 1 of this application; Figure 12 This is the fifth field curvature distortion diagram of the imaging lens module provided in Embodiment 1 of this application; Figure 13 The sixth MTF curve of the imaging lens module provided in Embodiment 1 of this application; Figure 14 This is the sixth field curvature distortion diagram of the imaging lens module provided in Embodiment 1 of this application; Figure 15The graphs and data showing the changes in T3, T4, and T3+T4 for the projection distance of the imaging lens module provided in Embodiment 1 of this application when it varies from 130mm to 1500mm. Figure 16 This is one of the MTF curves of the imaging lens module provided in Embodiment 2 of this application; Figure 17 This is one of the field curvature distortion diagrams of the imaging lens module provided in Embodiment 2 of this application; Figure 18 This is the second MTF curve of the imaging lens module provided in Embodiment 2 of this application; Figure 19 This is the second field curvature distortion diagram of the imaging lens module provided in Embodiment 2 of this application; Figure 20 The third MTF curve of the imaging lens module provided in Embodiment 2 of this application; Figure 21 This is the third field curvature distortion diagram of the imaging lens module provided in Embodiment 2 of this application; Figure 22 The fourth MTF curve of the imaging lens module provided in Embodiment 2 of this application; Figure 23 This is the fourth field curvature distortion diagram of the imaging lens module provided in Embodiment 2 of this application; Figure 24 The fifth MTF curve of the imaging lens module provided in Embodiment 2 of this application; Figure 25 This is the fifth field curvature distortion diagram of the imaging lens module provided in Embodiment 2 of this application; Figure 26 The sixth MTF curve of the imaging lens module provided in Embodiment 2 of this application; Figure 27 This is the sixth field curvature distortion diagram of the imaging lens module provided in Embodiment 2 of this application; Figure 28 The graphs and data showing the changes in T3, T4, and T3+T4 for the projection distance of the imaging lens module provided in Embodiment 2 of this application when it varies from 130mm to 1500mm.

[0023] Explanation of reference numerals in the attached figures: 1. Fixed assembly; 11. First lens; 12. Second lens; 2. Aperture; 3. Movable compensation component; 31. Third lens; 32. Fourth lens; 33. Fifth lens; 4. Equivalent prism assembly; 5. Image generation component. Detailed Implementation

[0024] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0026] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0027] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0029] The imaging lens module, projection display device, and vehicle projection system provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0030] According to one aspect of the embodiments of this application, an imaging lens module is provided, which is suitable for application, for example, in the field of automotive projection display. The automotive projection display device may include, for example, a digital light processing (DLP) ground lamp, an in-vehicle projector, or a head-up display (HUD) system, etc., and the embodiments of this application do not impose specific limitations thereon.

[0031] According to the imaging lens module provided in the embodiments of this application, see [link to relevant documentation]. Figure 1 and Figure 2 The imaging lens module includes, along the optical axis from the projection surface side to the image source side, a fixed component 1, an aperture 2, a movable compensation component 3, and an equivalent prism component 4. The movable compensation component 3 is configured to move along the optical axis. The axial distance T1 between the projection surface and the fixed component 1 can continuously change and satisfies: 130mm ≤ T1 ≤ 1500mm. When T1 changes, the axial distance T3 between the aperture 2 and the movable compensation component 3, and the axial distance T4 between the movable compensation component 3 and the equivalent prism component 4 change accordingly, satisfying the relationship: (T3' + T4') / (T3 + T4) = 1, where T3' and T4' are the changed T3 and T4, respectively.

[0032] According to the embodiments of this application, combined with Figure 1As shown, the optical structure of the imaging lens module is arranged sequentially along its optical axis. Starting from the projection surface side for displaying the final projected image and ending at the image source side providing the original image light, it sequentially includes: a fixed component 1, an aperture 2, a movable compensation component 3, and an equivalent prism component 4. The movable compensation component 3 is constructed as a lens group that can be moved as a whole along the optical axis, and its position can be precisely controlled. This movable lens group design in the imaging lens module is a key technical feature that gives the entire module continuous zoom capability, thereby achieving the purpose of this invention.

[0033] In the imaging lens module provided in this application embodiment, the distance along the optical axis between the projection surface and the fixed component 1 is defined as T1. This distance T1 is designed to be continuously adjustable within the range of 130 mm to 1500 mm. This means that without replacing the imaging lens module or reorganizing the optical structure, the same module can achieve clear imaging and projection at any target distance between 130 mm and 1500 mm by adjusting T1. This wide-range continuous focusing capability allows it to flexibly adapt to various automotive optical scenarios, from near-field door-mounted ground projection to mid-to-long-range windshield HUD information display.

[0034] To ensure excellent image quality across such a wide zoom range, this application employs an internal distance-linked compensation mechanism. Specifically, the axial distance between the aperture stop 2 and the movable compensation component 3 is defined as T3, and the axial distance between the movable compensation component 3 and the equivalent prism component 4 is defined as T4. When T1 is adjusted to change the projection distance, the movable compensation component 3 moves along the optical axis, thereby synchronously causing changes in the values ​​of distances T3 and T4. A core optical design principle of this application is that regardless of how distance T1 changes, the sum of distances T3 and T4 after the change must be strictly equal to their sum before the change. That is, if the changed distances are denoted as T3' and T4' respectively, the relationship always satisfies: T3' + T4' = T3 + T4. This constant constraint ensures that the image plane of the imaging lens module remains stable and aberrations are effectively compensated during zooming, which is key to achieving a wide range of continuous zoom while maintaining high image quality.

[0035] The imaging lens module provided in this application embodiment can achieve a wide range of continuous zoom. By moving the movable compensation component 3 along the optical axis and adjusting the distances T3 and T4 in a coordinated manner, continuous and stable adjustment of the projection distance T1 between 130mm and 1500mm is achieved, so that the same imaging lens module can cover a variety of projection needs from near field to far field without replacement.

[0036] The imaging lens module provided in this application embodiment can ensure stable image quality during zooming. By constraining T3 and T4 to always keep their sum constant during the change (i.e., (T3'+T4') / (T3+T4)=1), aberrations caused by changes in projection distance are effectively compensated, ensuring clear and stable image quality throughout the entire zoom range.

[0037] The imaging lens module provided in this application embodiment achieves continuous zoom over a wide range from 130mm to 1500mm while maintaining the miniaturization and compactness of the overall module structure through the coordinated movement of the movable compensation component 3 along the optical axis and the change in the internal axial spacing (T3 and T4). This integrated design allows a single imaging lens module to be adapted to various automotive optical scenarios such as in-vehicle projection, head-up displays (HUDs), and ground lights, significantly enhancing the module's functional versatility and integration adaptability within vehicle systems, thereby optimizing the overall performance of the optical system and the end-user experience.

[0038] See some examples in this application. Figure 2 The fixing component 1 includes a first lens 11 and a second lens 12 arranged sequentially along the optical axis from the projection surface side to the image source side. The first lens 11 has negative optical power and at least one optical surface is aspherical, and the second lens 12 has positive optical power.

[0039] In this example of the application, see Figure 1 and Figure 2 Along the direction of light propagation, from the image source side to the projection surface side, the optical component through which the light last passes before reaching the projection surface is the fixed component 1. This fixed component 1 is designed to consist of two lenses (i.e., the first lens 11 and the second lens 12) arranged sequentially along the optical axis, and its specific function and design are as follows: Along the direction of light propagation, after passing through the movable compensation component 3, the light reaches the second lens 12. The second lens 12 is designed to have positive optical power and serves to converge the light. Its main function is to converge the light beam from the movable compensation component 3 and participate in the correction of chromatic aberration and field curvature of the system, laying the foundation for subsequent fine aberration adjustment and image plane stabilization.

[0040] Subsequently, light enters the first lens 11. This first lens 11 is designed to have negative optical power, serving a diverging function. Together with the second lens 12, it forms a lens group with an overall negative optical power. The primary function of the first lens 11 is to control the divergence and balance aberrations of the light converged by the second lens 12. Specifically, at least one optical surface of the first lens 11 is designed as an aspherical surface. Aspherical surfaces can continuously adjust their curvature according to off-axis height, thereby precisely controlling the direction of light and effectively correcting aberrations such as spherical aberration, coma, and distortion caused by large field of view or large aperture. This is of great significance for achieving miniaturization and high imaging quality of the overall imaging lens module.

[0041] In summary, the positive and negative optical power configuration arranged according to the direction of light incidence, and the introduction of an aspherical fixing component 1 in the first lens 11, maintains a fixed position during zooming, providing stable negative optical power output and terminal aberration correction for the entire imaging lens module. This ensures that the emitted light can form a clear image on any projection surface within the range of 130mm to 1500mm. The dynamic aberration and focal plane compensation of the fixing component 1 and the movable compensation component 3 work together to form the optical basis for achieving wide-range continuous clear zoom.

[0042] In one specific embodiment of this application, the fixing component 1 consists of a first lens 11 and a second lens 12 arranged sequentially along the optical axis from the image source side to the projection surface side. The first lens 11 is an aspherical lens with negative optical power, and the second lens 12 is a spherical lens with positive optical power.

[0043] See some examples in this application. Figure 1 and Figure 2 The movable compensation component 3 includes a third lens 31, a fourth lens 32 and a fifth lens 33 arranged sequentially along the optical axis from the projection side to the image source side. The third lens 31 has negative optical power, the fourth lens 32 has positive optical power, and the fifth lens 33 has positive optical power and at least one optical surface is aspherical.

[0044] In this example of the application, see Figure 1 and Figure 2 The movable compensation component 3 is designed to consist of three lenses arranged sequentially along the optical axis from the image source side to the projection surface side, specifically including a fifth lens 33, a fourth lens 32, and a third lens 31. The movable compensation component 3 can move as a whole along the optical axis.

[0045] In the light propagation path, the light from the equivalent prism assembly 4 first enters the fifth lens 33. This fifth lens 33 has positive optical power, and at least one of its optical surfaces is aspherical. As the first lens in the movable compensation assembly 3 closest to the image source, its main function is to initially converge the light and, by utilizing the aspherical properties, pre-correct higher-order aberrations of the system, such as spherical aberration and coma, laying the foundation for aberration correction by subsequent lenses.

[0046] The light then enters the fourth lens 32. The fourth lens 32 has positive optical power, and its main function is to further converge the light, work in conjunction with the fifth lens 33 to adjust the optical power distribution, and participate in the correction of chromatic aberration and field curvature.

[0047] Finally, the light reaches the third lens 31. This third lens 31 has negative optical power, and its main function is to precisely adjust the divergence of the light beam that has been converged by the two positive lenses in front. By introducing negative optical power, the third lens 31 helps to control the total optical power of the imaging lens module and corrects the image plane curvature and distortion that may be caused by the converging effect of the positive lens group, so that the light can enter the fixed assembly 1 behind it in an optimized state.

[0048] In summary, this positive (aspherical)-positive-negative optical power combination design enables the movable compensation component 3 to dynamically and collaboratively adjust the optical power contribution of each lens when moving along the optical axis to adjust the projection distance T1. This allows for real-time and effective compensation for various aberrations and image plane positions caused by changes in object distance. Working in conjunction with the fixed component 1, it ensures that the imaging lens module maintains excellent image quality throughout the entire zoom range of 130mm to 1500mm.

[0049] In one specific embodiment of this application, the movable compensation component 3 includes a fifth lens 33, a fourth lens 32, and a third lens 31 arranged sequentially along the optical axis from the image source side to the projection surface side. The fifth lens 33 is an aspherical lens with positive optical power, the fourth lens 32 is a spherical lens with positive optical power, and the third lens 31 is a spherical lens with negative optical power.

[0050] See some examples in this application. Figure 1 and Figure 2 The third lens 31 and the fourth lens 32 are glued together to form a cemented lens.

[0051] In this example of the application, see Figure 1 and Figure 2 In the movable compensation assembly 3, the third lens 31 and the fourth lens 32 are configured to be cemented together to form a cemented lens. This design is a preferred design of this application.

[0052] The cemented lens in this example is made by cementing a spherical lens with negative optical power (i.e., the third lens 31) and a spherical lens with positive optical power (i.e., the fourth lens 32). The adjacent curved surfaces of the two lenses are matched and precisely cemented to form a composite lens unit with unified optical properties and a stable structure.

[0053] This cemented lens design brings the following key advantages to the movable compensation component 3 and the entire imaging lens module: (1) Excellent color difference correction capability: By combining lens materials with opposite optical power and different dispersion characteristics (Abbe number), the cemented lens can effectively cancel axial color difference and magnification color difference in a wide spectrum range, significantly improving the clarity and color reproduction of the color projection image.

[0054] (2) Enhanced structural stability and assembly processability: The glued structure solidifies two independent lenses into a whole, which not only greatly improves the long-term stability of the imaging lens module in the vehicle vibration environment, but also simplifies the lens barrel structure and reduces the assembly difficulty, which is conducive to ensuring mass production consistency.

[0055] (3) Optimize aberration balance and facilitate miniaturization: As a single optical element participating in the module design, the cemented lens provides more optimization freedom for controlling aberrations such as spherical aberration and field curvature. At the same time, its compact optical structure reduces the space and mechanical spacers required for the separate installation of the two lenses, directly promoting the miniaturization and weight reduction of the movable compensation component 3 and even the entire imaging lens module.

[0056] In summary, the implementation of this cemented lens is one of the key designs of the movable compensation component 3, which achieves dynamic aberration compensation while also ensuring high performance, high reliability, and high manufacturability.

[0057] See some examples in this application. Figure 1 The axial distance T2 between the fixed component 1 and the aperture 2 is a fixed value and satisfies: 2.5mm≤T2≤4.0mm.

[0058] In this example of the application, see Figure 1 The axial distance between the fixed component 1 and the aperture 2 is defined as T2, and this distance T2 is configured to remain constant during the operation of the imaging lens module, with a specific value range of 2.5 mm to 4.0 mm.

[0059] Setting the distance T2 to a fixed value means that the position of the aperture stop 2 on the optical axis relative to the fixed component 1 is determined. This directly locks the position of the aperture stop of the imaging lens module (i.e., the aperture stop 2 that actually limits the beam diameter), thus providing a stable entrance pupil reference for the entire zoom process. The stable pupil position ensures that the starting conditions of the light entering the fixed component 1 are controllable and consistent, which is an important optical basis for achieving coherent aberration correction logic and uniform and predictable imaging performance throughout the zoom range.

[0060] The preferred distance range of 2.5 mm to 4.0 mm represents a balance between optical aberration correction and the feasibility of the optical structure. This distance is close enough that the aperture 2 can be adjacent to the fixing component 1 and effectively constrain the aperture of the beam about to be incident on the fixing component 1, which is beneficial for controlling off-axis aberrations (such as coma and astigmatism) and suppressing stray light; at the same time, this distance is far enough to avoid the risk of mechanical interference between the aperture 2 and the optical surface of the fixing component 1 closest to the aperture 2, and to provide the necessary space to reduce the impact of aperture edge diffraction on image quality.

[0061] Since distance 2 is fixed in the design, during the zooming process of adjusting the projection distance T1, it is only necessary to drive the movable compensation component 3 to move along the optical axis, without simultaneously adjusting the position of the aperture 2. This greatly simplifies the motion mechanism and corresponding control logic inside the imaging lens module, reduces the mechanical complexity and manufacturing cost of the system, and thus significantly improves the vibration reliability, durability and mass production consistency of the imaging lens module required in the automotive environment.

[0062] By controlling T2 within a small millimeter range, the axial space occupied between the fixed component 1 and the aperture 2 is directly reduced, which helps to compress the total optical length (TTL) of the imaging lens module. This optical parameter design is one of the key measures to achieve a compact and lightweight overall module structure to meet the stringent space constraints of vehicle installation.

[0063] In summary, designing T2 as a fixed value within the range of 2.5mm to 4.0mm is a design that integrates considerations of optical performance optimization, mechanical stabilization, and system miniaturization. It plays an important role in ensuring that the imaging lens module maintains high-quality and highly reliable projection performance throughout the wide range of continuous zoom.

[0064] See some examples in this application. Figure 1 The imaging lens module further includes an image generating component 5 disposed on the image source side of the equivalent prism component 4. The axial distance T5 between the equivalent prism component 4 and the image generating component 5 is a fixed value and satisfies: 1.0mm≤T5≤2.0mm.

[0065] In this example of the application, see Figure 1 The imaging lens module further includes an image generating component 5 disposed on the image source side of the equivalent prism assembly 4. The axial distance between the equivalent prism assembly 4 and the image generating component 5 is defined as T5, and this distance T5 is designed to be a fixed value, with a value range satisfying 1.0mm ≤ T5 ≤ 2.0mm.

[0066] The image generating component 5 is the source of the image, and can be a microdisplay chip such as a DMD, LCD, or LCoS. The equivalent prism component 4 can be used to realize optical functions such as optical path folding and color synthesis. Setting the axial distance T5 between the two to a fixed and relatively short value (1.0mm~2.0mm) essentially constructs a compact, stable, and positionally defined optomechanical interface.

[0067] The function and beneficial effects of the design in this example are described in detail below: Fixed T5 means that the relative position between the image plane of the image generating component 5 and the exit surface of the equivalent prism component 4 is fixed. Therefore, throughout the zoom process, when the movable compensation component 3 moves to change the projection distance T1, no compensatory adjustment is required to the position of the image generating component 5. This greatly simplifies the module's control logic and ensures that a key interface in the optical path remains stable, which is beneficial for uniform aberration correction across the entire zoom range.

[0068] The short-distance design of 1.0mm to 2.0mm minimizes unnecessary air gaps between the pixel surface of the image generation component 5 and the equivalent prism component 4. This helps reduce light energy diffusion loss and stray light caused by surface reflection in this gap, thereby improving the light energy utilization efficiency and potential image contrast of the imaging lens module.

[0069] The short-distance design of 1.0mm to 2.0mm directly compresses the axial dimension of the imaging lens module in the image source direction, creating favorable conditions for the layout and installation of projection display devices in the limited space inside the vehicle. It is one of the key designs that promotes the miniaturization and thinning of terminal products.

[0070] Therefore, designing the distance T5 to be a fixed value within the range of 1.0mm to 2.0mm is a key design that integrates optical, mechanical, and integration considerations. It fixes the image plane starting point of the module, simplifies dynamic zoom control, optimizes light efficiency and reliability, and promotes structural compactness. It is an important technical feature to ensure that the imaging lens module has high performance and high stability.

[0071] In some examples of this application, the pupil diameter D of the imaging lens module and the effective focal length EFL satisfy: EFL / D≤2.45.

[0072] In this example of the application, the optical parameters of the imaging lens module satisfy the following: the ratio of its effective focal length (EFL) to its pupil diameter (D), EFL / D, does not exceed 2.45.

[0073] Here, the pupil diameter D refers to the entrance pupil diameter of the imaging lens module, that is, the diameter of the image formed by the aperture stop (aperture stop 2) when viewed from the projection surface side. It determines the maximum aperture of the light beam that can enter the module to participate in imaging.

[0074] The condition EFL / D ≤ ​​2.45 in this example defines the range of F-numbers (F / #) for the imaging lens module. In optics, the F-number is approximately equal to the ratio of the effective focal length to the entrance pupil diameter (F / # ≈ EFL / D). Therefore, this condition implies that the imaging lens module is designed to have a smaller F-number, i.e., a larger relative aperture. This design offers two main benefits: On the one hand, it ensures high light throughput: the larger relative aperture allows more light to pass through the imaging lens module, thus ensuring that the projected image maintains sufficient brightness and illuminance during a wide zoom range of 130mm to 1500mm, and under different ambient lighting conditions. This is crucial for achieving clear and striking visual displays in in-vehicle environments with significant changes in brightness.

[0075] On the other hand, it balances the difficulty of aberration correction with optical performance: increasing the relative aperture (decreasing the F-number) exacerbates aberrations such as spherical aberration and coma, placing higher demands on aberration correction design. In this example, the upper limit of the ratio is set at 2.45, which is a balance achieved between pursuing high light throughput and maintaining an achievable level of aberration correction. It ensures that while the imaging lens module provides high brightness output, its imaging quality (such as resolution and contrast) can still be effectively controlled through the design of the fixed component 1 and the movable compensation component 3.

[0076] In summary, the EFL / D≤2.45 parameter constraint is a parameter design specification for the entire imaging lens module from two dimensions: light energy utilization and image quality controllability. It is one of the key optical features that enables it to balance bright output and clear imaging.

[0077] In some examples of this application, the total length TTL of the imaging lens module and the effective focal length EFL satisfy: TTL / EFL < 4.5.

[0078] Total optical length (TTL): In this application, it refers to the physical distance measured along the optical axis from the optical surface of the imaging lens module closest to the projection surface (i.e., the projection surface side surface of the first lens 11 in the fixing assembly 1) to the image plane of the image generating assembly 5. This parameter directly reflects the size of the imaging lens module in the optical axis direction.

[0079] Effective focal length (EFL): refers to the equivalent focal length of the imaging lens module, which is a core performance parameter characterizing its optical magnification and field of view.

[0080] The constraint TTL / EFL < 4.5 in this example is a clear constraint on the compactness of the entire imaging lens module structure, and its effect is mainly reflected in the following two aspects: On the one hand, it achieves axial miniaturization: a ratio of less than 4.5 indicates that the total length (TTL) of the imaging module is kept low while achieving specific optical performance (EFL). This addresses the space constraints of the automotive environment, a key indicator driving optical design towards shorter overall length and higher integration. It ensures that the imaging lens module provides the required optical performance while maintaining physical dimensions that facilitate layout and installation in limited spaces such as the dashboard and headliner.

[0081] On the other hand, it reflects a better level of optical design: while achieving a wide range of continuous zoom from 130mm to 1500mm and maintaining high image quality, it can keep the total optical length of the imaging lens module within this ratio, which reflects the optimization efficiency of optical design.

[0082] In summary, the design principle of TTL / EFL < 4.5 is a key requirement based on both physical size constraints and optical design performance. It ensures that the imaging lens module meets the demands for wide-range, high-quality zoom while maintaining excellent compactness, thus satisfying the miniaturization, lightweighting, and high integration requirements of automotive projection systems.

[0083] In some examples of this application, the refractive index Nd and Abbe number Vd of each lens material satisfy the following: The first lens 11 satisfies: Nd1 < 1.60, Vd1 > 50; The second lens 12 satisfies: Nd2 < 1.75, Vd2 < 45; The third lens 31 satisfies: Nd3 > 1.75, Vd3 < 40; The fourth lens 32 satisfies: Nd4 < 1.75, Vd4 > 45; The fifth lens 33 satisfies: Nd5 < 1.60, Vd5 > 50.

[0084] The material combination scheme proposed in this example is an optical design that works in conjunction with the aforementioned negative-positive optical power (fixed component 1) and negative-positive-positive optical power (movable compensation component 3) allocation. Its purpose is to achieve efficient correction of various aberrations, especially chromatic aberration, by matching materials with specific refractive indices and dispersion characteristics to lenses of different optical powers and positions. This ensures that the imaging lens module achieves a clear projection effect throughout the entire zoom range of 130mm to 1500mm.

[0085] The specific analysis is as follows: The material selection principle for the fixed component 1 is as follows: the first lens 11 is a negative lens, made of a low refractive index (Nd1 < 1.60) and low dispersion (high Abbe number Vd1 > 50) material, which helps to introduce lower dispersion while bearing the main negative optical power. The second lens 12 is a positive lens, made of a medium refractive index (Nd2 < 1.75) and high dispersion (low Abbe number Vd2 < 45) material. The combination of the two forms the basis of an achromatic combination, which can effectively correct axial chromatic aberration.

[0086] The materials used in the movable compensation component 3 are as follows: The third lens 31 is a negative lens, made of a high-refractive-index (Nd3 > 1.75) and high-dispersion (low Abbe number Vd3 < 40) material. This is beneficial for achieving the required negative optical power under limited curvature and works synergistically with the high-dispersion characteristics. The fourth lens 32 is a positive lens, made of a medium-refractive-index (Nd4 < 1.75) and low-dispersion (high Abbe number Vd4 > 45) material. The fifth lens 33 (also a positive lens) is similar to the first lens 11, made of a low-refractive-index (Nd5 < 1.60) and low-dispersion (high Abbe number Vd5 > 50) material. This alternation and combination of high-dispersion negative lenses and low-dispersion positive lenses (especially the third lens 31 and the fourth lens 32 can be cemented together) constitutes a powerful chromatic aberration and magnification chromatic aberration correction mechanism. At the same time, the low-dispersion characteristics of the fifth lens 33 help to balance the residual chromatic aberration generated by the previous components.

[0087] This material combination design in the example is not an isolated parameter, but rather deeply integrated with the optical power and surface shape (aspherical and spherical) design of each lens. It allows the fixed component 1 and the movable compensation component 3 to not only compensate for image plane shift and aberrations caused by changes in object distance when zooming through movement, but also to dynamically maintain excellent chromatic aberration correction. This is one of the key technical supports for achieving the effect of clear projection within the 130-1500mm range through the reasonable combination of optical power and materials of the fixed component 1 and the movable compensation component 3. This optical parameter design, from a material perspective, ensures that the imaging lens module can present high-quality images with accurate color reproduction and sharp edges throughout the zoom range and the entire field of view.

[0088] In some examples of this application, the aspherical surface profiles of the first lens 11 and the fifth lens 33 are defined by the following formula: Z(h) = ch 2 / [1+1 (1+k)c 2 h 2 ] 1 / 2 +Ah 2 +Bh 4 +Ch 6 +Dh 8 +Eh 10 +Fh 12 +Gh 14 +Hh 16 ; Where Z(h) is the sag of the distance between the aspherical surface and the vertex of the aspherical surface at a height of h along the optical axis, c=1 / r, r is the radius of curvature, k is the conic coefficient, and A, B, C, D, E, F, G, and H are the coefficients of higher-order terms of the aspherical surface.

[0089] The purpose of using the above formula to define aspherical surfaces is to overcome the limitations of traditional spherical lenses in aberration correction. By flexibly adjusting the conic coefficient k and the coefficients of various higher-order terms, optical designers can specifically and continuously fine-tune the light refraction capability of different areas on the lens surface.

[0090] Specifically, in the imaging lens module of this application, at least one surface of the first lens 11 with negative optical power and the fifth lens 33 with positive optical power is designed as such an aspherical surface, which enables: Correction of higher-order aberrations: Correction of spherical aberration, coma, field curvature, and distortion, which are particularly noticeable in wide zoom range, large aperture systems using multiple spherical lenses.

[0091] Simplified optical structure: Under the premise of achieving the same or even better image quality, the application of aspherical surfaces can reduce the number of lenses required, thereby helping to achieve miniaturization and weight reduction of the module, and potentially reducing the structural complexity and production cost of the imaging lens module.

[0092] Improved image quality stability during zooming: When the movable compensation component 3 moves to achieve zooming, the additional aberration correction freedom provided by the aspherical surface helps to ensure that the image quality (such as MTF) can be maintained at a high level throughout the entire projection distance range of 130mm to 1500mm.

[0093] Therefore, the definition and application of this aspherical formula is one of the key technical means for the invention of the imaging lens module to achieve wide-range continuous zoom while maintaining high imaging quality.

[0094] In some examples of this application, the first lens 11 and the fifth lens 33 are aspherical lenses; the second lens 12, the third lens 31 and the fourth lens 32 are spherical lenses.

[0095] In this example of the application, the surface shape of each lens in the imaging lens module is specified: the first lens 11 and the fifth lens 33 are implemented as aspherical lenses; while the second lens 12, the third lens 31 and the fourth lens 32 are implemented as spherical lenses.

[0096] Regarding aspherical lens design, specifically: The first lens 11, being the lens closest to the projection surface and possessing negative optical power in the fixed assembly 1, has an aspherical design primarily used to correct aberrations in the final outgoing light path. Since the first lens 11 is located at the end of the optical path, it directly determines the quality of the projected beam. Its aspherical surface effectively corrects distortion and image plane curvature (field curvature) caused by a large field of view, and compensates for higher-order spherical aberrations and coma caused by the large relative aperture of the module. Its surface shape plays a decisive role in controlling the global geometric fidelity and edge sharpness of the projected image.

[0097] The fifth lens 33, being the lens closest to the image source and possessing positive optical power in the movable compensation assembly 3, has an aspherical design that performs the function of motion aberration compensation. During zooming, as the movable compensation assembly 3 moves along the optical axis, the aberration state of the imaging lens module dynamically changes. The aspherical surface of the fifth lens 33 can flexibly compensate for astigmatism caused by the movement of the assembly 3, changes in higher-order spherical aberrations during zooming, and residual distortion at different zoom positions (i.e., different T1), thereby ensuring image quality stability and consistency of the imaging lens module throughout the entire zoom range of 130mm to 1500mm.

[0098] Therefore, the aspherical design of the first lens 11 and the fifth lens 33 plays a crucial role in aberration correction at the fixed end and dynamic relay position of the optical path, respectively. Working together, they ensure that the imaging lens module achieves high-definition, low-distortion projection effects across the entire focal length and field of view while realizing wide-range continuous zoom.

[0099] Regarding the design of the spherical lens, specifically: The second lens 12, the third lens 31, and the fourth lens 32 all employ a spherical design. This significantly reduces the difficulty and cost of lens fabrication. In the imaging lens module, these spherical lenses form the main framework for optical power distribution. In particular, by designing optical materials with specific dispersion characteristics (Abbe number) for the third lens 31 and the fourth lens 32, and combining them (e.g., cementing), axial chromatic aberration and magnification chromatic aberration can be efficiently corrected. Simultaneously, they also collaboratively participate in correcting primary aberrations such as astigmatism and field curvature, constructing a stable and reliable aberration correction foundation for the entire imaging lens module.

[0100] In this application, the aspherical design of the first lens 11 and the fifth lens 33 is used to correct higher-order aberrations (such as higher-order spherical aberration and coma) and distortions that are difficult for spherical lenses to handle. This division of labor allows spherical lenses to work stably under relatively relaxed tolerance requirements, while aspherical lenses can concentrate their design freedom to achieve breakthroughs in key performance characteristics.

[0101] This hybrid surface design, combining spherical and aspherical surfaces, ensures that the imaging lens module achieves a wide range of continuous zoom from 130mm to 1500mm and high image quality, while maximizing the module's optical performance, manufacturing economy, production consistency, and long-term reliability.

[0102] The imaging lens module of this application will be described in detail below through Embodiment 1 and Embodiment 2.

[0103] Example 1 This embodiment 1 provides a specific implementation scheme for an imaging lens module. See [link to implementation details]. Figure 1 and Figure 2 As shown, the imaging lens module includes, along the optical axis from the projection surface side to the image source side, the following components in sequence: a fixed component 1, an aperture stop 2, a movable compensation component 3, and an equivalent prism component 4. The movable compensation component 3 can move as a whole along the optical axis and is the core moving component for achieving zoom.

[0104] In this imaging lens module, the axial distance T1 between the projection surface and the fixed component 1 can continuously vary within the range of 130mm to 1500mm. When T1 changes, the distance T3 between the aperture 2 and the movable compensation component 3, and the distance T4 between the movable compensation component 3 and the equivalent prism component 4 will be adjusted accordingly, and the sum of the distances before and after the change will always remain constant, that is, T3'+T4'=T3+T4, where T3' and T4' are the changed values.

[0105] Specifically: See Figure 1 and Figure 2The fixing component 1 consists of two lenses, which, viewed from the image source side to the projection surface side, are in sequence: an aspherical lens 11 with negative optical power and a spherical lens 12 with positive optical power.

[0106] See also Figure 1 and Figure 2 The movable compensation component 3 consists of three lenses. Viewed from the image source side to the projection surface side, they are, in order: a fifth aspherical lens 33 with positive optical power, a fourth spherical lens 32 with positive optical power, and a third spherical lens 31 with negative optical power. The third lens 31 and the fourth lens 32 are cemented together to form a cemented lens.

[0107] The imaging lens module also includes an image generating component 5 disposed on the image source side of the equivalent prism assembly 4. The axial distance T5 between the equivalent prism assembly 4 and the image generating component 5 is a fixed value.

[0108] For detailed optical parameters, aspherical coefficients, and zoom data of this embodiment 1, please refer to Tables 1, 2, and 3 respectively. Figures 3 to 15 It demonstrates its imaging performance across the entire zoom range.

[0109] Table 1 shows the optical parameters of the imaging lens module provided in this embodiment 1, as follows.

[0110] Table 1

[0111] It should be noted that in Table 1 above, the surface of the first lens 11 near the projection surface is designated as surface S1, and the surface near the image source is designated as surface S2. The surface of the second lens 12 near the projection surface is designated as surface S3, and the surface near the image source is designated as surface S4. The surface where the aperture stop 2 is located is S5. The surface of the third lens 31 near the projection surface is designated as surface S6, the surface bonded to the fourth lens 32 is designated as surface S7, and the surface of the fourth lens 32 near the image source is designated as surface S8. The surface of the fifth lens 33 near the projection surface is designated as surface S9, and the surface near the image source is designated as surface S10.

[0112] The imaging lens module provided in this embodiment 1 satisfies the above optical structure and Table 1. S1 and S2 are two aspherical surfaces of the first lens 11, and S9 and S10 are two aspherical surfaces of the fifth lens 33. The aspherical surface shapes are described as follows: Z(h) = ch 2 / [1+1 (1+k)c 2 h 2 ] 1 / 2 +Ah2 +Bh 4 +Ch 6 +Dh 8 +Eh 10 +Fh 12 +Gh 14 +Hh 16 ; Where Z(h) is the sag of the distance between the aspherical surface and the vertex of the aspherical surface at a height of h along the optical axis, c=1 / r, r is the radius of curvature, k is the conic coefficient, and A, B, C, D, E, F, G, and H are the coefficients of higher-order terms of the aspherical surface.

[0113] Table 2 shows the aspherical parameters of the first lens 11 and the fifth lens 33 provided in this embodiment 1.

[0114] Table 2

[0115] In this embodiment 1, the imaging lens module can project clearly at a projection distance T1 between 130mm and 1500mm. Figures 3 to 14 For MTF and distortion maps of T1 = 130mm~1500mm, from Figures 3 to 14 It can be seen that: See Figure 3 , Figure 5 , Figure 7 , Figure 9 , Figure 11 and Figure 13 Within the full range of 130mm to 1500mm, the MTF curve shows that the contrast ratio of each field of view is >0.5 at the characteristic frequency, and the image quality at the edges and center is close, which meets the requirements of high-definition projection.

[0116] See Figure 4 , Figure 6 , Figure 8 , Figure 10 , Figure 12 and Figure 14 Distortion is less than 1.5% across the entire zoom range, resulting in high fidelity of projected images with no significant distortion.

[0117] From near-focus to far-focus, the changes in MTF and distortion are stable, verifying the effectiveness of the movable compensation mechanism.

[0118] Example 1 achieves stable imaging with high definition and low distortion over a wide projection distance range.

[0119] Table 3 shows the curves and data of T3, T4, and T3+T4 when the projection distance T1 varies from 130mm to 1500mm.

[0120] Table 3

[0121] See Figure 15 As shown, T3+T4 is conserved. The movable compensation component 3 is always in the optimal aberration correction position. The optical scheme provided in this embodiment 1 achieves constant image quality during a wide range of focusing.

[0122] Example 2 This embodiment 2 provides another specific optical implementation scheme for realizing the inventive concept of this application. Its optical architecture is the same as that of embodiment 1 above, and can be found in [reference needed]. Figure 1 and Figure 2 This embodiment also includes a fixed component 1, an aperture 2, a movable compensation component 3, an equivalent prism component 4, and an image generating component 5 arranged sequentially along the optical axis, and follows the same distance variation relationship (i.e., T1 is variable, T3+T4 is constant, and T2 and T5 are fixed). The difference between this embodiment 2 and the aforementioned embodiment 1 lies in the specific optical design parameters, including but not limited to the radius of curvature, thickness, spacing, material refractive index and Abbe number of each lens, and aspherical coefficient, etc. Please refer to Tables 4, 5, and 6 below for these specific parameters. It can also achieve continuous clear zoom within the projection distance T1 range of 130mm to 1500mm and meet the conditions defined in the claims of this application.

[0123] Table 4 shows the optical parameters of the imaging lens module provided in Example 2. The details of Table 4 are as follows: Table 4

[0124] It should be noted that in Table 2 above, the surface of the first lens 11 near the projection surface is designated as surface S1, and the surface near the image source is designated as surface S2. The surface of the second lens 12 near the projection surface is designated as surface S3, and the surface near the image source is designated as surface S4. The surface where the aperture stop 2 is located is S5. The surface of the third lens 31 near the projection surface is designated as surface S6, the surface bonded to the fourth lens 32 is designated as surface S7, and the surface of the fourth lens 32 near the image source is designated as surface S8. The surface of the fifth lens 33 near the projection surface is designated as surface S9, and the surface near the image source is designated as surface S10.

[0125] The imaging lens module provided in this embodiment 2 satisfies the above optical structure and Table 2. S1 and S2 are two aspherical surfaces of the first lens 11, and S9 and S10 are two aspherical surfaces of the fifth lens 33. The aspherical surface shapes are described as follows: Z(h) = ch 2 / [1+1 (1+k)c 2 h 2 ] 1 / 2 +Ah2 +Bh 4 +Ch 6 +Dh 8 +Eh 10 +Fh 12 +Gh 14 +Hh 16 ; Where Z(h) is the sag of the distance between the aspherical surface and the vertex of the aspherical surface at a height of h along the optical axis, c=1 / r, r is the radius of curvature, k is the conic coefficient, and A, B, C, D, E, F, G, and H are the coefficients of higher-order terms of the aspherical surface.

[0126] Table 5 provides the aspherical parameters of the first lens 11 and the fifth lens 33 for Example 2.

[0127] Table 5

[0128] In this embodiment 2, the imaging lens module can project clearly at a projection distance T1 between 130mm and 1500mm. Figures 16 to 27 For MTF and distortion maps of T1 = 130mm~1500mm, from Figures 16 to 27 It can be seen that: See Figure 16 , Figure 18 , Figure 20 , Figure 22 , Figure 24 and Figure 26 Within the full range of 130mm to 1500mm, the MTF remains above 0.5 at the characteristic frequency (e.g., 50lp / mm), and the center and edge fields of view reach more than 80% of the diffraction limit, proving excellent resolution.

[0129] See Figure 17 , Figure 19 , Figure 21 , Figure 23 , Figure 25 and Figure 27 Distortion is less than 1.5% across the entire zoom range and decreases smoothly with T1 without any jumps, resulting in no distortion of the displayed graphics (crucial for vehicle HUDs / ground lights).

[0130] From near-focus to far-focus, the changes in MTF and distortion are stable, verifying the effectiveness of the movable compensation mechanism.

[0131] This embodiment 2 maintains high definition and low distortion even with large projection distance variations.

[0132] Table 6 shows the curves and data of T3, T4, and T3+T4 when the projection distance T1 varies from 130mm to 1500mm.

[0133] Table 6

[0134] See Figure 28 As shown, T3+T4 is conserved. The movable compensation component 3 is always in the optimal aberration correction position. The optical scheme provided in this embodiment 2 achieves constant image quality during a wide range of focusing.

[0135] According to another aspect of the embodiments of this application, a projection display device is also provided, the projection display device including the imaging lens module as described above and a drive mechanism for driving the movable compensation component to move along the optical axis.

[0136] This application provides a projection display device, the key design of which is the integration of the imaging lens module as described above, and the addition of a drive mechanism for driving the movable compensation component 3 to move along the optical axis.

[0137] The introduction of the drive mechanism allows the user or system controller to precisely and automatically adjust the position of the movable compensation component 3, thereby enabling continuous variation of the projection distance T1 within the range of 130mm to 1500mm. This means that a single projection display device can adapt to different projection scenarios and installation positions without manually changing lenses or making complex optical adjustments, achieving flexible switching from close-range large-format projection to long-range small-size information display.

[0138] Based on the aforementioned imaging lens module's high image quality across the entire focal length, compact structure, and stable optical performance, this projection display device ultimately manifests as an intelligent, multifunctional, highly integrated terminal product with an excellent user experience, solving the pain point of the limited application scenarios of traditional fixed-focus projection devices.

[0139] According to another aspect of the embodiments of this application, an in-vehicle projection system is also provided, characterized in that it includes the projection display device as described above, wherein the projection display device is used for in-vehicle projection, HUD display or DLP ground illumination.

[0140] This application provides an in-vehicle projection system, the key component of which is the integration of the projection display device described above, and its specific application to in-vehicle functional scenarios such as in-vehicle projection, head-up display (HUD) or digital light processing (DLP) ground lighting.

[0141] This embodiment clarifies the application scenario of this application. Applying a projection display device with wide-range continuous zoom capability to vehicles provides optical flexibility for intelligent automotive cockpits.

[0142] Traditionally, in-vehicle projection, HUD, and ground illumination require different optical modules. However, the optical design of this application allows the use of the same imaging lens module, with the projection distance changed only by a program-controlled drive mechanism, thus covering diverse needs ranging from ground illumination (short distance) to windshield information display (medium to long distance) and cabin interior projection (medium to short distance). This greatly promotes the standardization, platformization, and cost optimization of automotive optical systems.

[0143] Furthermore, the installation space, projection path, and screen position vary significantly between different vehicle models. The wide-range continuous zoom capability of this vehicle projection system allows the same hardware platform to be adapted to different vehicle models and installation schemes through software calibration, significantly improving the design's versatility.

[0144] Users can enjoy consistently clear and infinitely adjustable display effects. For example, the HUD's imaging distance can be dynamically fine-tuned according to driver preference or vehicle speed; the puddle light pattern can adaptively adjust its position and size according to the door opening angle. This adaptive and personalized interaction significantly enhances the cabin's technological feel, comfort, and safety.

[0145] The specific implementation of the vehicle projection system in this application can refer to the above-described embodiments of the projection display device and imaging lens module. Therefore, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0146] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0147] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. An imaging lens module, characterized in that, Along the optical axis from the projection surface side to the image source side, it includes a fixed component (1), an aperture (2), a movable compensation component (3), and an equivalent prism component (4) in sequence. The movable compensation component (3) is configured to be movable along the optical axis. The axial distance T1 between the projection surface and the fixed component (1) can be continuously varied and satisfies: 130mm≤T1≤1500mm; when T1 changes, the axial distance T3 between the aperture (2) and the movable compensation component (3) and the axial distance T4 between the movable compensation component (3) and the equivalent prism component (4) change accordingly and satisfy the relationship: (T3'+T4') / (T3+T4)=1, where T3' and T4' are the changed T3 and T4 respectively; The fixing component (1) includes a first lens (11) and a second lens (12) arranged sequentially along the optical axis from the projection surface side to the image source side. The first lens (11) has negative optical power, and the second lens (12) has positive optical power. The movable compensation component (3) includes a third lens (31), a fourth lens (32) and a fifth lens (33) arranged sequentially along the optical axis from the projection side to the image source side. The third lens (31) has negative optical power, the fourth lens (32) has positive optical power, and the fifth lens (33) has positive optical power.

2. The imaging lens module according to claim 1, characterized in that, At least one optical surface of the first lens (11) is aspherical.

3. The imaging lens module according to claim 2, characterized in that, At least one optical surface of the fifth lens (33) is aspherical.

4. The imaging lens module according to claim 3, characterized in that, The third lens (31) and the fourth lens (32) are glued together to form a glued lens.

5. The imaging lens module according to claim 1, characterized in that, The axial distance T2 between the fixed component (1) and the aperture (2) is a fixed value and satisfies: 2.5mm≤T2≤4.0mm.

6. The imaging lens module according to claim 1, characterized in that, The imaging lens module also includes an image generating component (5) disposed on the image source side of the equivalent prism component (4). The axial distance T5 between the equivalent prism component (4) and the image generating component (5) is a fixed value and satisfies: 1.0mm≤T5≤2.0mm.

7. The imaging lens module according to claim 3, characterized in that, The aspherical surface profiles of the first lens (11) and the fifth lens (33) are defined by the following formula: Z(h)=ch 2 / [1+1 (1+k)c 2 h 2 ] 1 / 2 +Ah 2 +Bh 4 +Ch 6 +Dh 8 +Eh 10 +Fh 12 +Gh 14 +Hh 16 ; Where Z(h) is the sag of the distance between the aspherical surface and the vertex of the aspherical surface at a height of h along the optical axis, c=1 / r, r is the radius of curvature, k is the conic coefficient, and A, B, C, D, E, F, G, and H are the coefficients of higher-order terms of the aspherical surface.

8. The imaging lens module according to claim 3, characterized in that, The first lens (11) and the fifth lens (33) are aspherical lenses; The second lens (12), the third lens (31) and the fourth lens (32) are spherical lenses.

9. A projection display device, characterized in that, include: The imaging lens module according to any one of claims 1-8; as well as, A drive mechanism for driving the movable compensation component (3) to move along the optical axis.

10. A vehicle-mounted projection system, characterized in that, include: The projection display device as claimed in claim 9, wherein the projection display device is applied to in-vehicle projection, HUD display, or DLP ground illumination lamp.

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