Small wide-angle imaging optical system and camera device
By designing a small wide-angle imaging optical system and employing specific lens combinations and lens thickness and focal length conditions, the challenges of large aperture, high pixel count, and miniaturization were solved, achieving high-definition and low-cost imaging effects.
Patent Information
- Application Number
- CN202520202444.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-10
AI Technical Summary
Existing technologies cannot simultaneously meet the demands of large aperture, high pixel count, and miniaturization, resulting in high-cost imaging systems that fail to meet user needs.
Design a small wide-angle imaging optical system, comprising a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power. By setting the conditional relationship between the lens center thickness and focal length, and combining the aperture stop and light-transmitting element, optimize the aberration correction and imaging quality of the optical system.
It meets the requirements of large aperture, high pixel count, and miniaturization, reduces production costs, improves user experience, and provides high definition and good image quality.
Smart Images
Figure CN223770458U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical imaging technology, and in particular to a small wide-angle imaging optical system and camera device. Background Technology
[0002] In recent years, intelligent imaging and intelligent surveillance have flourished, and video surveillance systems are indispensable for ensuring the safety of people's daily lives and national security. Furthermore, with the current trend of electronic products being both functional and lightweight, low-cost camera lenses that offer a wide-angle view, compact design, and good image quality have become the mainstream in the market.
[0003] Traditional high-resolution, miniaturized photographic lenses used in electronic devices primarily employ multi-element lens structures, which increases the cost of imaging systems. Furthermore, the increasing trend towards larger apertures in photographic lenses in recent years has made it difficult for traditional lens-based optical systems to simultaneously meet the demands of large apertures, high resolution, and miniaturization. Therefore, providing a high-resolution optical system that combines large apertures is one of the problems the industry is currently trying to solve. Utility Model Content
[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a small wide-angle imaging optical system that can simultaneously meet the requirements of large aperture, high pixel count, and miniaturization, thereby reducing production costs, meeting user needs, and improving the user experience.
[0005] This application also proposes a camera device that can simultaneously meet the requirements of large aperture, high pixel count, and miniaturization, thereby reducing production costs, meeting user needs, and improving user experience.
[0006] According to the first aspect of this application, the small wide-angle imaging optical system comprises, in sequence from the object side to the image side along the optical axis: a first lens, a second lens, an aperture stop, a third lens, and a fourth lens; the first lens has negative refractive power, has a first object-side surface and a first image-side surface, both of which are concave and aspherical; the second lens has positive refractive power, has a second object-side surface and a second image-side surface, both of which are convex and aspherical; the third lens has negative refractive power, has a third object-side surface and a third image-side surface, the third object-side surface is convex, the third image-side surface is concave, and both are aspherical; the fourth lens has positive refractive power, has a fourth object-side surface and a fourth image-side surface, both of which are convex and aspherical; the aperture stop is disposed between the second lens and the third lens; wherein, the center thickness D1 of the first lens and the center thickness D3 of the second lens satisfy the condition: 1.5 <D3 / D1<5.5。
[0007] The compact wide-angle imaging optical system according to the first aspect of this application has at least the following advantages: by setting conditions for the center thicknesses of the first lens and the second lens, it is beneficial to mutually compensate and correct aberrations in the optical system, which is more conducive to high-quality and clear imaging of the optical system. The compact wide-angle imaging optical system described in this application can simultaneously meet the requirements of large aperture, high pixel count, and miniaturization, reduce production costs, meet user needs, and improve user experience.
[0008] According to the small wide-angle imaging optical system described in the first aspect of this application, the focal length f1 of the first lens and the focal length f of the optical system satisfy the condition: -2 <f1 / f<0。
[0009] According to the small wide-angle imaging optical system described in the first aspect of this application, the focal length f2 of the second lens and the focal length f of the optical system satisfy the condition: 0 <f2 / f<3。
[0010] According to the compact wide-angle imaging optical system described in the first aspect of this application, the focal length f4 of the fourth lens and the focal length f of the optical system satisfy the condition: 0.3 <f4 / f<1.2。
[0011] According to the small wide-angle imaging optical system described in the first aspect of this application, the maximum imaging field of view (FOV) of the optical system and the focal length (f) of the optical system satisfy the condition: 130 <FOV / f<250。
[0012] According to the small wide-angle imaging optical system described in the first aspect of this application, the distance TTL from the first object side to the imaging surface on the optical axis and the center thickness D8 of the fourth lens satisfy the following condition: 5 <TTL / D8<9。
[0013] According to the compact wide-angle imaging optical system described in the first aspect of this application, the focal length f3 of the third lens and the center thickness D6 of the third lens satisfy the condition: -50 <f3 / D6<-18。
[0014] The small wide-angle imaging optical system according to the first aspect of this application further includes a light-transmitting element disposed on the side of the fourth lens away from the third lens.
[0015] According to the small wide-angle imaging optical system of the first aspect of this application, the light-transmitting element has a fifth object-side surface and a fifth image-side surface, both of which are spherical.
[0016] The camera system according to the second aspect of this application includes the small wide-angle imaging optical system according to the first aspect of this application.
[0017] The camera system according to the second aspect of the present application has at least the following beneficial effects: the camera system according to the second aspect of the present application can simultaneously meet the requirements of large aperture, high pixel count and miniaturization, reduce production costs, meet user needs, and improve user experience.
[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0019] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0020] Figure 1 This is a schematic diagram of the structure of a first embodiment of the small wide-angle imaging optical system of this application;
[0021] Figure 2 This is a schematic diagram of the structure of a second embodiment of the small wide-angle imaging optical system of this application.
[0022] Figure label:
[0023] First lens 100; First object side surface S1; First image side surface S2; Second lens 200; Second object side surface S3; Second image side surface S4; Aperture 300; Third lens 400; Third object side surface S5; Third image side surface S6; Fourth lens 500; Fourth object side surface S7; Fourth image side surface S8; Light-transmitting element 600; Fifth object side surface S9; Fifth image side surface S10. Detailed Implementation
[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0025] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0026] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0027] In the description of this application, unless otherwise expressly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this application based on the specific content of the technical solution. In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0028] Reference Figure 1 and Figure 2 The first aspect of this application provides a small wide-angle imaging optical system, which includes, in sequence along the optical axis from the object side to the image side: a first lens 100, a second lens 200, an aperture stop 300, a third lens 400, and a fourth lens 500; the first lens 100 has negative refractive power, and has a first object-side surface S1 and a first image-side surface S2, both of which are concave and aspherical; the second lens 200 has positive refractive power, and has a second object-side surface S3 and a second image-side surface S4, the second object-side surface S3 and... The second image-side surface S4 is convex and aspherical; the third lens 400 has negative refractive power, and has a third object-side surface S5 and a third image-side surface S6, where the third object-side surface S5 is convex and the third image-side surface S6 is concave, and both are aspherical; the fourth lens 500 has positive refractive power, and has a fourth object-side surface S7 and a fourth image-side surface S8, both of which are convex and aspherical; the aperture stop 300 is disposed between the second lens 200 and the third lens 400. The center thickness D1 of the first lens 100 and the center thickness D3 of the second lens 200 satisfy the condition: 1.5 <D3 / D1<5.5。
[0029] By setting conditions for the central thickness of the first lens 100 and the second lens 200, it is beneficial to mutually compensate and correct the aberration problem of the optical system, and it is more beneficial to achieve high-quality clear imaging of the optical system. The small wide-angle imaging optical system of the embodiment of the present application can simultaneously meet the requirements of large aperture, high pixel and miniaturization, reduce production costs, meet the user's usage requirements, and improve the user's usage experience.
[0030] In some embodiments, the focal length f1 of the first lens 100 and the focal length f of the optical system satisfy the conditional formula: -2 < f1 / f < 0. Since both the first object side S1 and the first image side S2 are aspherical surfaces, they can provide negative optical power for the optical system, making the optical system have the characteristics of wide viewing angle and low sensitivity.
[0031] In some embodiments, the focal length f2 of the second lens 200 and the focal length f of the optical system satisfy the conditional formula: 0 < f2 / f < 3. Since both the second object side S3 and the second image side S4 are aspherical surfaces, they can provide positive optical power for the optical system, thereby effectively correcting the aberration of the optical system and improving the imaging quality of the optical system, so as to obtain a high-definition imaging optical system.
[0032] In some embodiments, the focal length f4 of the fourth lens 500 and the focal length f of the optical system satisfy the conditional formula: 0.3 < f4 / f < 1.2. By setting in the way of the lower limit of the above conditional formula, it is beneficial to reduce the angle of the chief ray incident on the image plane of the peripheral viewing angle, so that the optical system obtains a suitable imaging field range; by setting in the way of the upper limit of the above conditional formula, it is beneficial to easily suppress the generation of astigmatism and achieve high-quality clear image quality.
[0033] In some embodiments, the maximum imaging field angle FOV of the optical system and the focal length f of the optical system satisfy the conditional formula: 130 < FOV / f < 250. By effectively setting the imaging range of the optical system, it is beneficial to the physical application of the wide-angle range of the optical system and the uniform imaging of the corresponding pixel positions of the sensor.
[0034] In some embodiments, the distance TTL from the first object side S1 to the imaging plane on the optical axis and the central thickness D8 of the fourth lens <500> satisfy the conditional formula: 5 < TTL / D8 < 9. By adopting the above conditional formula and reasonably configuring the central thickness of the fourth lens <500>, the structure of the optical system can be made compact, and the stability of the optical system structure can be increased.
[0035] In some embodiments, the focal length f3 of the third lens 400 and the central thickness D6 of the third lens 400 satisfy the conditional formula: -50 < f3 / D6 < -18. By adopting the above conditional formula, the imaging angle range of the optical system can be increased, so as to achieve the required imaging field range.
[0036] In some embodiments, the small wide-angle imaging optical system further includes a light-transmitting element 600, which is disposed on the side of the fourth lens 500 away from the third lens 400. The light-transmitting element 600 has a fifth object-side surface S9 and a fifth image-side surface S10, both of which are spherical. By providing the light-transmitting element 600, a portion of the light is filtered to reduce stray light and glare, further improving the color sharpness of the image and achieving good color reproduction.
[0037] The small wide-angle imaging optical system described in the first aspect of this application will now be described in detail.
[0038] Example 1
[0039] Reference Figure 1 The small wide-angle imaging optical system described in this application includes, in sequence along the optical axis from the object side to the image side: a first lens 100, a second lens 200, an aperture stop 300, a third lens 400, a fourth lens 500, and a light-transmitting element 600.
[0040] The first lens 100 has negative refractive power and has a first object-side surface S1 and a first image-side surface S2, both of which are concave and aspherical. The second lens 200 has positive refractive power and has a second object-side surface S3 and a second image-side surface S4, both of which are convex and aspherical. The third lens 400 has negative refractive power and has a third object-side surface S5 and a third image-side surface S6, where the third object-side surface S5 is convex and the third image-side surface S6 is concave. The third object-side surface S5 and the third image-side surface S6 are both aspherical. The fourth lens 500 has positive refractive power and has a fourth object-side surface S7 and a fourth image-side surface S8, both of which are convex and aspherical. The aperture 300 is disposed between the second lens 200 and the third lens 400. The light-transmitting element 600 is disposed on the side of the fourth lens 500 away from the third lens 400 and has a fifth object-side surface S9 and a fifth image-side surface S10, both of which are spherical. Light from the object passes sequentially through each surface S1 to S10 and is finally imaged on the image plane.
[0041] The optical system has a focal length f of 0.81, an aperture value FNO of 2.07, and a maximum imaging field of view (FOV) of 113.4.
[0042] In this embodiment, the focal length f1 of the first lens 100 and the focal length f of the optical system satisfy f1 / f = -1.443. The focal length f2 of the second lens 200 and the focal length f of the optical system satisfy f2 / f = 2.337. The center thickness D1 of the first lens 100 and the center thickness D3 of the second lens 200 satisfy D3 / D1 = 1.828. The focal length f4 of the fourth lens 500 and the focal length f of the optical system satisfy f4 / f = 1.090. The maximum imaging field of view (FOV) of the optical system and the focal length f of the optical system satisfy FOV / f = 140.0. The distance TTL from the first object-side surface S1 to the imaging surface on the optical axis and the center thickness D8 of the fourth lens 500 satisfy TTL / D8 = 8.606. The focal length f3 of the third lens 400 and the center thickness D6 of the third lens 400 satisfy f3 / D6 = -19.661.
[0043] The relevant parameters of each lens in the optical system in this embodiment are shown in Table 1.
[0044] Table 1
[0045]
[0046] The parameters of each aspherical lens in the optical system provided in this embodiment are shown in Table 2.
[0047] Table 2
[0048]
[0049] Example 2
[0050] Reference Figure 2 The small wide-angle imaging optical system described in this application includes, in sequence along the optical axis from the object side to the image side: a first lens 100, a second lens 200, an aperture stop 300, a third lens 400, a fourth lens 500, and a light-transmitting element 600.
[0051] The first lens 100 has negative refractive power and has a first object-side surface S1 and a first image-side surface S2, both of which are concave and aspherical. The second lens 200 has positive refractive power and has a second object-side surface S3 and a second image-side surface S4, both of which are convex and aspherical. The third lens 400 has negative refractive power and has a third object-side surface S5 and a third image-side surface S6, where the third object-side surface S5 is convex and the third image-side surface S6 is concave. The third object-side surface S5 and the third image-side surface S6 are both aspherical. The fourth lens 500 has positive refractive power and has a fourth object-side surface S7 and a fourth image-side surface S8, both of which are convex and aspherical. The aperture 300 is disposed between the second lens 200 and the third lens 400. The light-transmitting element 600 is disposed on the side of the fourth lens 500 away from the third lens 400 and has a fifth object-side surface S9 and a fifth image-side surface S10, both of which are spherical. Light from the object passes sequentially through each surface S1 to S10 and is finally imaged on the image plane.
[0052] The optical system has a focal length f of 0.54, an aperture value FNO of 2.0, and a maximum imaging field of view (FOV) of 125.
[0053] The relevant parameters of each lens in the optical system in this embodiment are shown in Table 3.
[0054] Table 3
[0055]
[0056] The parameters of each aspherical lens in the optical system provided in this embodiment are shown in Table 4.
[0057] Table 4
[0058]
[0059] In this embodiment, the focal length f1 of the first lens 100 and the focal length f of the optical system satisfy f1 / f = -1.184. The focal length f2 of the second lens 200 and the focal length f of the optical system satisfy f2 / f = 2.851. The center thickness D1 of the first lens 100 and the center thickness D3 of the second lens 200 satisfy D3 / D1 = 5.450. The focal length f4 of the fourth lens 500 and the focal length f of the optical system satisfy f4 / f = 0.581. The maximum imaging field of view (FOV) of the optical system and the focal length f of the optical system satisfy FOV / f = 231.5. The distance TTL from the first object-side surface S1 to the imaging surface on the optical axis and the center thickness D8 of the fourth lens 500 satisfy TTL / D8 = 5.709. The focal length f3 of the third lens 400 and the center thickness D6 of the third lens 400 satisfy f3 / D6 = -47.688.
[0060] In summary, both Example 1 and Example 2 satisfy the relationships shown in Table 5.
[0061] Table 5
[0062]
[0063] A second aspect of this application provides a camera device, including the small wide-angle imaging optical system described in the first aspect of this application.
[0064] The camera system described in the second aspect of this application can simultaneously meet the requirements of large aperture, high pixel count, and miniaturization, thereby reducing production costs, meeting user needs, and improving user experience.
[0065] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.
Claims
1. A compact wide-angle imaging optical system characterized by comprising: In order from the object side to the image side along the optical axis, the optical system comprises: a first lens, a second lens, a diaphragm, a third lens, and a fourth lens; The first lens has negative refractive power, the first lens has a first object side and a first image side, the first object side and the first image side are both concave and both aspherical surfaces; The second lens has positive refractive power, the second lens has a second object side and a second image side, the second object side and the second image side are both convex and both aspherical surfaces; The third lens has negative refractive power, the third lens has a third object side and a third image side, the third object side is convex, the third image side is concave, and the third object side and the third image side are both aspherical surfaces; The fourth lens has positive refractive power, the fourth lens has a fourth object side and a fourth image side, the fourth object side and the fourth image side are both convex and both aspherical surfaces; The diaphragm is arranged between the second lens and the third lens; Wherein, the center thickness D1 of the first lens and the center thickness D3 of the second lens satisfy the condition formula: 1.5<D3 / D1<5.
5.
2. The compact wide-angle imaging optical system according to claim 1, characterized by, The focal length f1 of the first lens and the focal length f of the optical system satisfy the condition formula: -2<f1 / f<0.
3. The compact wide-angle imaging optical system of claim 1, wherein The focal length f2 of the second lens and the focal length f of the optical system satisfy the condition formula: 0<f2 / f<3.
4. The compact wide-angle imaging optical system of claim 1, wherein The focal length f4 of the fourth lens and the focal length f of the optical system satisfy the condition formula: 0.3<f4 / f<1.
2.
5. The compact wide-angle imaging optical system of claim 1, wherein The maximum imaging field angle FOV of the optical system and the focal length f of the optical system satisfy the condition formula: 130<FOV / f<250.
6. The compact wide-angle imaging optical system of claim 1, wherein The distance TTL on the optical axis from the first object side to the imaging surface and the center thickness D8 of the fourth lens satisfy the condition formula: 5<TTL / D8<9.
7. The compact wide-angle imaging optical system of claim 1, wherein The focal length f3 of the third lens and the center thickness D6 of the third lens satisfy the condition formula: -50<f3 / D6<-18.
8. The compact wide-angle imaging optical system of claim 1, wherein Further comprising a light-transmitting member, the light-transmitting member is arranged on the side of the fourth lens away from the third lens.
9. The compact wide-angle imaging optical system according to claim 8, characterized by, The light-transmitting member has a fifth object side and a fifth image side, the fifth object side and the fifth image side are both spherical surfaces.
10. An image pickup device, characterized by comprising: A small wide-angle imaging optical system comprising any one of claims 1 to 9.