A glass-plastic hybrid high-definition scanning imaging system
By employing a four-lens structure and a hybrid glass-plastic design, the problems of imaging consistency and stability in scanning imaging systems have been solved, achieving low-cost, high-resolution, and low-distortion imaging effects suitable for both consumer and industrial equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGDONG XUYE OPTOELECTRONICS TECH
- Filing Date
- 2026-03-19
- Publication Date
- 2026-05-26
AI Technical Summary
Existing scanning imaging systems have shortcomings in terms of imaging consistency, stability, and cost. Traditional all-glass lenses have complex structures and high costs, while plastic lenses cannot simultaneously meet the requirements of low distortion, high telecentricity, and low chromatic aberration. Furthermore, thermal expansion and refractive index drift lead to scanning instability.
It adopts a four-lens structure, including a first lens, a second lens, a third lens and a fourth lens. Combining glass and plastic materials, and through the design of specific optical parameter relationships, it achieves low distortion, high telecentricity and good thermal stability. The optical imaging lenses are arranged sequentially from the object side to the image side.
A simple and low-cost high-definition scanning imaging system is provided, which features high resolution, low distortion and high telecentricity, and excellent thermal stability, making it suitable for consumer-grade and high-volume industrial equipment.
Smart Images
Figure CN122085488A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical lens technology, specifically to a glass-plastic hybrid high-definition scanning imaging system. Background Technology
[0002] Current industry demands that scanning imaging systems provide consistent imaging across the entire scanning plane (typically a line or a rectangular area). Key performance indicators include: extremely low distortion (<0.1%), high telecentricity (principal ray angle close to 0 degrees), high MTF to resolve details, and excellent chromatic aberration correction to avoid color fringing.
[0003] Traditional scanning lenses are mostly all-glass multi-element designs, which have excellent performance, but are complex in structure, expensive and heavy, making them unsuitable for consumer-grade or mass-production industrial equipment. All-plastic lenses cannot simultaneously meet the requirements of low distortion, high telecentricity and low chromatic aberration. The thermal expansion and refractive index drift of plastic materials can cause the position of the scanning line and the focal plane to drift, resulting in poor stability when scanning at high speed or when the environment and document change. Summary of the Invention
[0004] This invention provides a glass-plastic hybrid high-definition scanning imaging system, which uses four lenses arranged sequentially from the object side to the image side: a first lens, a second lens, a third lens, and a fourth lens. This provides a glass-plastic hybrid high-definition scanning imaging system with a simple structure, low cost, and high resolution, low distortion, high telecentricity, and good thermal stability. Under certain conditions, the optical imaging lens can simultaneously meet the requirements of high imaging quality and low distortion.
[0005] This invention provides the following technical solution: A glass-plastic hybrid high-definition scanning imaging system includes: a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side to the image side. The object side and image side of the second lens are spherical, while the object side and image side of the first, third, and fourth lenses are aspherical. The first lens has negative refractive power and its object side is convex near the axis. The second lens has positive refractive power and its object side is convex. The third lens has negative refractive power and its image side is concave. The fourth lens has negative refractive power, its object side is concave near the axis, and its image side is convex near the axis. An aperture is disposed between the second and third lenses.
[0006] As a preferred embodiment of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationships: -6.12 < f1 / f234 < -4.81, -0.42 < f12 / f4 < -0.15, where f1 is the focal length of the first lens, f234 is the combined focal length of the second, third and fourth lenses, f12 is the combined focal length of the first and second lenses, and f4 is the focal length of the fourth lens.
[0007] As a preferred embodiment of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 2.41 < TTL / ImgH < 4.42, where TTL is the total optical length of the glass-plastic hybrid high-definition scanning imaging system, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the glass-plastic hybrid high-definition scanning imaging system.
[0008] As a preferred embodiment of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 2.84 < TTL / ∑AT < 4.58, where ∑AT is the sum of the distances between any two adjacent lenses on the optical axis from the first lens to the fourth lens.
[0009] As a preferred technical solution of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 24.22<CT2 / T23<27.89, where CT2 is the center thickness of the second lens and T23 is the distance between the second lens and the third lens on the optical axis.
[0010] As a preferred technical solution of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 0.85 < TL / Dg < 2.13, where TL is the distance from the object-side surface of the first lens to the imaging plane on the optical axis, and Dg is the diagonal length of the maximum usable viewing angle of the lens group on the image plane.
[0011] As a preferred embodiment of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 0.32 < f / TL < 0.96, where f is the overall focal length of the lens group.
[0012] As a preferred embodiment of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 3.31 < f2 / CT2 < 5.42, where f2 is the focal length of the second lens.
[0013] As a preferred embodiment of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 0.37 < f3 / f4 < 0.74, where f3 is the focal length of the third lens.
[0014] As a preferred technical solution of the present invention, the glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 0.71<(SAG11+SAG12) / CT1<1.41, where SAG11 is the sagitta of the object side of the first lens, SAG12 is the sagitta of the image side of the first lens, and CT1 is the center thickness of the first lens.
[0015] Compared with the prior art, the present invention provides a glass-plastic hybrid high-definition scanning imaging system, which has the following beneficial effects: 1. In this glass-plastic hybrid high-definition scanning imaging system, the structure is simple and low-cost, and it simultaneously possesses high-definition resolution, low distortion, high telecentricity and good thermal stability. The four-element lens consists of a first lens, a second lens, a third lens and a fourth lens in sequence from the object side to the image side. When certain conditions are met, the optical imaging lens can simultaneously meet the requirements of high imaging quality and low distortion.
[0016] The parts not mentioned in this device are the same as or can be implemented using existing technologies. The glass-plastic hybrid high-definition scanning imaging lens of this invention is a four-lens type. The surface structure of each lens is combined with the optimal range of optical parameters, which can maintain high resolution and low distortion imaging quality in an extremely simplified structure. The cost of the hybrid combination of glass and plastic lenses is significantly lower than that of the all-glass lens solution, providing strong market competitiveness for terminal devices. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
[0018] Figure 1 This is a lens layout diagram of the present invention; Figure 2 This is a schematic diagram of field curvature / distortion in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of axial aberration in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of field curvature / distortion in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of axial aberration in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of field curvature / distortion in Embodiment 3 of the present invention; Figure 7 This is a schematic diagram of axial aberration in Embodiment 3 of the present invention; Figure 8 This is a schematic diagram of field curvature / distortion in Embodiment 4 of the present invention; Figure 9 This is a schematic diagram of axial aberration in Embodiment 4 of the present invention; Figure 10 This is a schematic diagram of field curvature / distortion in Embodiment 5 of the present invention; Figure 11 This is a schematic diagram of axial aberration in Embodiment 5 of the present invention.
[0019] In the diagram: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Aperture stop. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] Reference Figure 1 A glass-plastic hybrid high-definition scanning imaging system includes: a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4 arranged sequentially from the object side to the image side. The object side and image side of the second lens 2 are spherical, while the object side and image side of the first lens 1, the third lens 3, and the fourth lens 4 are aspherical. Specifically, the first lens 1 has negative refractive power and its object side is convex near the axis; the second lens 2 has positive refractive power and its object side is convex; the third lens 3 has negative refractive power and its image side is concave; and the fourth lens 4 has negative refractive power, its object side is concave near the axis, and its image side is convex near the axis; and an aperture 5 is disposed between the second lens 2 and the third lens 3.
[0022] In the above design, the first lens 1, the third lens 3 and the fourth lens 4 are all made of plastic, and the second lens 2 is made of glass.
[0023] In some embodiments, the ratio of the focal length of the first lens 1 to the combined focal length of the second lens 2, the third lens 3, and the fourth lens 4 in the glass-plastic hybrid high-definition scanning imaging system satisfies the following range: -6.12 < f1 / f234 < -4.81, The ratio of the combined focal length of the first lens 1 and the second lens 2 to the focal length of the fourth lens 4 satisfies the following range: -0.42 < f12 / f4 < -0.15.
[0024] In some embodiments, the ratio of the total optical length of the lens group to half the diagonal length of the effective pixel area on the lens imaging plane in a glass-plastic hybrid high-definition scanning imaging system satisfies the following range: 2.41 < TTL / ImgH < 4.42.
[0025] In some embodiments, the ratio of the total optical length of the lens group in the glass-plastic hybrid high-definition scanning imaging system to the sum of the distances between any two adjacent lenses on the optical axis among the first lens 1 to the fourth lens 4 satisfies the following range: 2.84 < TTL / ∑AT < 4.58.
[0026] In some embodiments, the ratio of the center thickness of the second lens 2 to the distance between the second lens 2 and the third lens 3 on the optical axis in the glass-plastic hybrid high-definition scanning imaging system satisfies the following range: 24.22 < CT2 / T23 < 27.89.
[0027] In some embodiments, the ratio of the distance on the optical axis from the object-side surface of the first lens 1 to the imaging plane in the glass-plastic hybrid high-definition scanning imaging system to the diagonal length of the image plane at the maximum usable viewing angle of the lens group satisfies the following range: 0.85 < TL / Dg < 2.13.
[0028] In some embodiments, the ratio of the overall focal length of the lens group to the diagonal length of the image plane at the maximum usable viewing angle of the lens group in a glass-plastic hybrid high-definition scanning imaging system satisfies the following range: 0.32 < f / TL < 0.96.
[0029] In some embodiments, the ratio of the focal length to the center thickness of the second lens 2 in the glass-plastic hybrid high-definition scanning imaging system satisfies the following range: 3.31 < f2 / CT2 < 5.42.
[0030] In some embodiments, the ratio of the focal length of the third lens 3 to the focal length of the fourth lens 4 in the glass-plastic hybrid high-definition scanning imaging system satisfies the following range: 0.37 < f3 / f4 < 0.74.
[0031] In some embodiments, the ratio of the sum of the object-side elevation and the image-side elevation of the first lens 1 to the center thickness of the first lens 1 in a glass-plastic hybrid high-definition scanning imaging system satisfies the following range: 0.71<(SAG11+SAG12) / CT1<1.41.
[0032] In the above scheme, the meanings of "alphanumeric" are as follows: f1: Focal length of the first lens 1; f234: The combined focal length of the second lens 2, the third lens 3, and the fourth lens 4; f12: The focal length of the first lens 1 and the second lens 2 combined; f4: Focal length of the fourth lens 4; TTL: Total optical length of the lens assembly; ImgH: Half the diagonal length of the effective pixel area on the imaging surface of the lens group; CT2: Center thickness of the second lens 2; T23: The distance between the second lens 2 and the third lens 3 on the optical axis; ∑AT: The sum of the distances between any two adjacent lenses on the optical axis from the first lens 1 to the fourth lens 4; TL: The distance on the optical axis from the object-side surface of the first lens 1 to the imaging surface; Dg: The diagonal length of the image formed on the image plane at the maximum usable angle of view of the lens group; f: The overall focal length of the lens group; f2: Focal length of the second lens 2; f3: Focal length of the third lens 3; f4: Focal length of the fourth lens 4; SAG11: Sagitta of the object-side surface of the first lens 1; SAG12: Sagitta of the image side of the first lens 1; CT1: Center thickness of the first lens 1.
[0033] Example 1: Based on the above design, the specific parameters selected for the optical imaging lens are: overall focal length f=7.95mm, aperture fno=3.68, and field of view FOV=43.50°. The parameters are shown in Table 1-1. Figure 2 and Figure 3 Field curvature / distortion diagram;
[0034] The corresponding aspherical coefficients are shown in Table 1-2:
[0035] Example 2: Based on the above design, the specific parameters selected for the optical imaging lens are: overall focal length f=7.715mm, aperture fno=3.68, and field of view FOV=44.72°. The parameters are shown in Table 2-1. Figure 4 and Figure 5 Field curvature / distortion diagram;
[0036] The corresponding aspherical coefficients are shown in Table 2-2:
[0037] Example 3: Based on the above design, the specific parameters selected for the optical imaging lens are: overall focal length f=7.85mm, aperture fno=3.68, and field of view FOV=43.98°. These parameters are shown in Table 3-1. Figure 6 and Figure 7 Field curvature / distortion diagram;
[0038] The corresponding aspherical coefficients are shown in Table 3-2:
[0039] Example 4: Based on the above design, the specific parameters selected for the optical imaging lens are: overall focal length f=7.89mm, aperture fno=3.68, and field of view FOV=43.85°. These parameters are shown in Table 4-1. Figure 8 and Figure 9 Field curvature / distortion diagram;
[0040] The corresponding aspherical coefficients are shown in Table 4-2:
[0041] Example 5: Based on the above design, the specific parameters selected for the optical imaging lens are: overall focal length f=7.82mm, aperture fno=3.69, and field of view FOV=43.85°. These parameters are shown in Table 5-1. Figure 10 and Figure 11 Field curvature / distortion diagram;
[0042] The corresponding aspherical coefficients are shown in Table 5-2:
[0043] In this invention, the glass-plastic hybrid high-definition scanning imaging lens is a four-lens type. The surface structure of each lens is combined with the optimal range of optical parameters, which can maintain high resolution and low distortion imaging quality in an extremely simplified structure. The cost of the hybrid combination of glass and plastic lenses is significantly lower than that of the all-glass lens solution, providing strong market competitiveness for terminal devices.
[0044] Components not described in detail in this article are existing technologies.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A glass-plastic hybrid high-definition scanning imaging system, characterized in that, include: The first lens, second lens, third lens, and fourth lens are arranged sequentially from the object side to the image side. The object side and image side of the second lens are spherical, while the object side and image side of the first lens, third lens, and fourth lens are aspherical. Among them, the first lens has negative refractive power and its object side is convex at the paraxial position; the second lens has positive refractive power and its object side is convex; the third lens has negative refractive power and its image side is concave; and the fourth lens has negative refractive power, its object side is concave at the paraxial position, and its image side is convex at the paraxial position. An aperture is positioned between the second and third lenses.
2. The glass-plastic hybrid high-definition scanning imaging system according to claim 1, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: -6.12 < f1 / f234 < -4.81, -0.42 < f12 / f4 < -0.15, Where f1 is the focal length of the first lens, f234 is the combined focal length of the second, third and fourth lenses, f12 is the combined focal length of the first and second lenses, and f4 is the focal length of the fourth lens.
3. The glass-plastic hybrid high-definition scanning imaging system according to claim 1, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 2.41 < TTL / ImgH < 4.42, where TTL is the total optical length of the lens group and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the lens group.
4. The glass-plastic hybrid high-definition scanning imaging system according to claim 3, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 2.84 < TTL / ∑AT < 4.58, where ∑AT is the sum of the distances between any two adjacent lenses on the optical axis from the first lens to the fourth lens.
5. The glass-plastic hybrid high-definition scanning imaging system according to claim 1, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 24.22 < CT2 / T23 < 27.89, where CT2 is the center thickness of the second lens and T23 is the distance between the second lens and the third lens on the optical axis.
6. The glass-plastic hybrid high-definition scanning imaging system according to claim 1, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 0.85 < TL / Dg < 2.13, where TL is the distance from the object-side surface of the first lens to the imaging plane on the optical axis, and Dg is the diagonal length of the maximum usable viewing angle of the lens group on the image plane.
7. A glass-plastic hybrid high-definition scanning imaging system according to claim 6, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 0.32 < f / TL < 0.96, where f is the overall focal length of the lens group.
8. A glass-plastic hybrid high-definition scanning imaging system according to claim 5, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 3.31 < f2 / CT2 < 5.42, where f2 is the focal length of the second lens.
9. A glass-plastic hybrid high-definition scanning imaging system according to claim 1, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 0.37 < f3 / f4 < 0.74, where f3 is the focal length of the third lens.
10. A glass-plastic hybrid high-definition scanning imaging system according to claim 1, characterized in that, The glass-plastic hybrid high-definition scanning imaging system satisfies the following relationship: 0.71 < (SAG11 + SAG12) / CT1 < 1.41, where SAG11 is the sagitta of the object side of the first lens, SAG12 is the sagitta of the image side of the first lens, and CT1 is the center thickness of the first lens.